Bump version to 0.9.7

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

.gitignore

@@ -5,6 +5,7 @@
 *~$
 cscope.*
 compile_commands.json
+/.cache
 /.clangd
 tags
 /build

.gitlab-ci.yml

@@ -2,6 +2,8 @@ variables:
   BUILD_IMAGES_PROJECT: libssh/build-images
   FEDORA_BUILD: buildenv-fedora
   CENTOS7_BUILD: buildenv-centos7
+  CENTOS8_BUILD: buildenv-c8s
+  CENTOS9_BUILD: buildenv-c9s
   TUMBLEWEED_BUILD: buildenv-tumbleweed
   MINGW_BUILD: buildenv-mingw
 
@@ -25,6 +27,47 @@ centos7/openssl_1.0.x/x86_64:
     paths:
       - obj/
 
+centos8/openssl_1.1.1/x86_64:
+  image: $CI_REGISTRY/$BUILD_IMAGES_PROJECT:$CENTOS8_BUILD
+  script:
+    - mkdir -p obj && cd obj && cmake
+      -DCMAKE_BUILD_TYPE=RelWithDebInfo
+      -DPICKY_DEVELOPER=ON
+      -DWITH_BLOWFISH_CIPHER=ON
+      -DWITH_SFTP=ON -DWITH_SERVER=ON -DWITH_ZLIB=ON -DWITH_PCAP=ON
+      -DUNIT_TESTING=ON -DCLIENT_TESTING=ON -DSERVER_TESTING=ON .. &&
+      make -j$(nproc) && ctest --output-on-failure
+  tags:
+    - shared
+  except:
+    - tags
+  artifacts:
+    expire_in: 1 week
+    when: on_failure
+    paths:
+      - obj/
+
+centos9/openssl_3.0.x/x86_64:
+  image: $CI_REGISTRY/$BUILD_IMAGES_PROJECT:$CENTOS9_BUILD
+  script:
+    - export OPENSSL_ENABLE_SHA1_SIGNATURES=1
+    - mkdir -p obj && cd obj && cmake
+      -DCMAKE_BUILD_TYPE=RelWithDebInfo
+      -DPICKY_DEVELOPER=ON
+      -DWITH_BLOWFISH_CIPHER=ON
+      -DWITH_SFTP=ON -DWITH_SERVER=ON -DWITH_ZLIB=ON -DWITH_PCAP=ON
+      -DUNIT_TESTING=ON -DCLIENT_TESTING=ON -DSERVER_TESTING=ON .. &&
+      make -j$(nproc) && ctest --output-on-failure
+  tags:
+    - shared
+  except:
+    - tags
+  artifacts:
+    expire_in: 1 week
+    when: on_failure
+    paths:
+      - obj/
+
 fedora/openssl_1.1.x/x86_64:
   image: $CI_REGISTRY/$BUILD_IMAGES_PROJECT:$FEDORA_BUILD
   script:
@@ -47,8 +90,8 @@ fedora/openssl_1.1.x/x86_64:
     paths:
       - obj/
 
-fedora/openssl_1.1.x/x86_64/fips:
-  image: $CI_REGISTRY/$BUILD_IMAGES_PROJECT:$FEDORA_BUILD
+centos8/openssl_1.1.1/x86_64/fips:
+  image: $CI_REGISTRY/$BUILD_IMAGES_PROJECT:$CENTOS8_BUILD
   script:
   - echo 1 > /etc/system-fips
   - update-crypto-policies --set FIPS
@@ -197,11 +240,13 @@ freebsd/x86_64:
     make && ctest --output-on-failure
   tags:
   - freebsd
+  - private
   except:
   - tags
   only:
   - branches@libssh/libssh-mirror
   - branches@cryptomilk/libssh-mirror
+  - branches@jjelen/libssh-mirror
   artifacts:
     expire_in: 1 week
     when: on_failure
@@ -455,61 +500,55 @@ tumbleweed/static-analysis:
     paths:
       - obj/scan
 
-visualstudio/x86_64:
+###############################################################################
+#                           Visual Studio builds                              #
+###############################################################################
+.vs:
+  stage: test
+  cache:
+    key: vcpkg.${CI_JOB_NAME}
+    paths:
+      - .vcpkg
   variables:
     ErrorActionPreference: STOP
   script:
-  - $env:VCPKG_DEFAULT_TRIPLET="x64-windows"
-  - mkdir -p obj; if ($?) {cd obj}; if (! $?) {exit 1}
-  - cmake
-      -A x64
-      -DCMAKE_TOOLCHAIN_FILE="$env:VCPKG_TOOLCHAIN_FILE"
-      -DPICKY_DEVELOPER=ON
-      -DWITH_SFTP=ON -DWITH_SERVER=ON -DWITH_ZLIB=ON -DWITH_PCAP=ON
-      -DUNIT_TESTING=ON ..
-  - cmake --build .
-  - ctest --output-on-failure
+    - cmake --build .
+    - ctest --output-on-failure
   tags:
-  - vs2017
-  - windows
+    - windows
+    - shared-windows
   except:
-  - tags
-  only:
-  - branches@libssh/libssh-mirror
-  - branches@ansasaki/libssh-mirror
-  - branches@cryptomilk/libssh-mirror
-  - branches@jjelen/libssh-mirror
+    - tags
   artifacts:
     expire_in: 1 week
     when: on_failure
     paths:
       - obj/
+  before_script:
+    - If (!(test-path .vcpkg\archives)) { mkdir -p .vcpkg\archives }
+    - $env:VCPKG_DEFAULT_BINARY_CACHE="$PWD\.vcpkg\archives"
+    - echo $env:VCPKG_DEFAULT_BINARY_CACHE
+    - $env:VCPKG_DEFAULT_TRIPLET="$TRIPLET-windows"
+    - vcpkg install cmocka
+    - vcpkg install openssl
+    - vcpkg install zlib
+    - vcpkg integrate install
+    - mkdir -p obj; if ($?) {cd obj}; if (! $?) {exit 1}
+    - cmake
+        -A $PLATFORM
+        -DCMAKE_TOOLCHAIN_FILE=C:/vcpkg/scripts/buildsystems/vcpkg.cmake
+        -DPICKY_DEVELOPER=ON
+        -DWITH_SFTP=ON -DWITH_SERVER=ON -DWITH_ZLIB=ON -DWITH_PCAP=ON
+        -DUNIT_TESTING=ON ..
+
+visualstudio/x86_64:
+  extends: .vs
+  variables:
+    PLATFORM: "x64"
+    TRIPLET: "x64"
 
 visualstudio/x86:
+  extends: .vs
   variables:
-    ErrorActionPreference: STOP
-  script:
-  - $env:VCPKG_DEFAULT_TRIPLET="x86-windows"
-  - mkdir -p obj; if ($?) {cd obj}; if (! $?) {exit 1}
-  - cmake
-      -DCMAKE_TOOLCHAIN_FILE="$env:VCPKG_TOOLCHAIN_FILE"
-      -DPICKY_DEVELOPER=ON
-      -DWITH_SFTP=ON -DWITH_SERVER=ON -DWITH_ZLIB=ON -DWITH_PCAP=ON
-      -DUNIT_TESTING=ON ..
-  - cmake --build .
-  - ctest --output-on-failure
-  tags:
-  - vs2017
-  - windows
-  except:
-  - tags
-  only:
-  - branches@libssh/libssh-mirror
-  - branches@ansasaki/libssh-mirror
-  - branches@cryptomilk/libssh-mirror
-  - branches@jjelen/libssh-mirror
-  artifacts:
-    expire_in: 1 week
-    when: on_failure
-    paths:
-      - obj/
+    PLATFORM: "win32"
+    TRIPLET: "x86"

CMakeLists.txt

@@ -10,7 +10,7 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules")
 include(DefineCMakeDefaults)
 include(DefineCompilerFlags)
 
-project(libssh VERSION 0.9.5 LANGUAGES C)
+project(libssh VERSION 0.9.7 LANGUAGES C)
 
 # global needed variable
 set(APPLICATION_NAME ${PROJECT_NAME})
@@ -22,7 +22,7 @@ set(APPLICATION_NAME ${PROJECT_NAME})
 #     Increment AGE. Set REVISION to 0
 #   If the source code was changed, but there were no interface changes:
 #     Increment REVISION.
-set(LIBRARY_VERSION "4.8.6")
+set(LIBRARY_VERSION "4.8.8")
 set(LIBRARY_SOVERSION "4")
 
 # where to look first for cmake modules, before ${CMAKE_ROOT}/Modules/ is checked
@@ -59,7 +59,13 @@ elseif(WITH_MBEDTLS)
     endif (NOT MBEDTLS_FOUND)
 else (WITH_GCRYPT)
   find_package(OpenSSL)
-  if (NOT OPENSSL_FOUND)
+  if (OPENSSL_FOUND)
+    # On CMake < 3.16, OPENSSL_CRYPTO_LIBRARIES is usually a synonym for OPENSSL_CRYPTO_LIBRARY, but is not defined
+    # when building on Windows outside of Cygwin. We provide the synonym here, if FindOpenSSL didn't define it already.
+    if (NOT DEFINED OPENSSL_CRYPTO_LIBRARIES)
+      set(OPENSSL_CRYPTO_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    endif (NOT DEFINED OPENSSL_CRYPTO_LIBRARIES)
+  else (OPENSSL_FOUND)
     find_package(GCrypt)
     if (NOT GCRYPT_FOUND)
       find_package(MbedTLS)
@@ -67,7 +73,7 @@ else (WITH_GCRYPT)
         message(FATAL_ERROR "Could not find OpenSSL, GCrypt or mbedTLS")
       endif (NOT MBEDTLS_FOUND)
     endif (NOT GCRYPT_FOUND)
-  endif (NOT OPENSSL_FOUND)
+  endif (OPENSSL_FOUND)
 endif(WITH_GCRYPT)
 
 if (UNIT_TESTING)
@@ -203,10 +209,10 @@ if (WITH_SYMBOL_VERSIONING AND ABIMAP_FOUND)
     endif(UPDATE_ABI)
 endif (WITH_SYMBOL_VERSIONING AND ABIMAP_FOUND)
 
-add_custom_target(dist COMMAND ${CMAKE_MAKE_PROGRAM} package_source DEPENDS ${_SYMBOL_TARGET})
+add_custom_target(dist COMMAND ${CMAKE_MAKE_PROGRAM} package_source DEPENDS ${_SYMBOL_TARGET} VERBATIM)
 
 # Link compile database for clangd
-execute_process(COMMAND cmake -E create_symlink
+execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink
                 "${CMAKE_BINARY_DIR}/compile_commands.json"
                 "${CMAKE_SOURCE_DIR}/compile_commands.json")
 

CPackConfig.cmake

@@ -10,7 +10,7 @@ set(CPACK_PACKAGE_VERSION ${PROJECT_VERSION})
 
 # SOURCE GENERATOR
 set(CPACK_SOURCE_GENERATOR "TXZ")
-set(CPACK_SOURCE_IGNORE_FILES "~$;[.]swp$;/[.]git/;/[.]clangd/;.gitignore;/build*;/obj*;tags;cscope.*;compile_commands.json;.*\.patch")
+set(CPACK_SOURCE_IGNORE_FILES "~$;[.]swp$;/[.]git;/[.]clangd/;/[.]cache/;.gitignore;/build*;/obj*;tags;cscope.*;compile_commands.json;.*\.patch")
 set(CPACK_SOURCE_PACKAGE_FILE_NAME "${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}")
 
 ### NSIS INSTALLER

ChangeLog

@@ -1,7 +1,30 @@
 ChangeLog
 ==========
 
-version 0.9.5 (released 2020-XX-XX)
+version 0.9.7 (released 2023-05-04)
+  * Fix CVE-2023-1667: a NULL dereference during rekeying with algorithm guessing
+  * Fix CVE-2023-2283: a possible authorization bypass in
+    pki_verify_data_signature under low-memory conditions.
+  * Fix several memory leaks in GSSAPI handling code
+  * Build and test related backports
+
+version 0.9.6 (released 2021-08-26)
+  * CVE-2021-3634: Fix possible heap-buffer overflow when rekeying with
+    different key exchange mechanism
+  * Fix several memory leaks on error paths
+  * Reset pending_call_state on disconnect
+  * Fix handshake bug with AEAD ciphers and no HMAC overlap
+  * Use OPENSSL_CRYPTO_LIBRARIES in CMake
+  * Ignore request success and failure message if they are not expected
+  * Support more identity files in configuration
+  * Avoid setting compiler flags directly in CMake
+  * Support build directories with special characters
+  * Include stdlib.h to avoid crash in Windows
+  * Fix sftp_new_channel constructs an invalid object
+  * Fix Ninja multiple rules error
+  * Several tests fixes
+
+version 0.9.5 (released 2020-09-10)
   * CVE-2020-16135: Avoid null pointer dereference in sftpserver (T232)
   * Improve handling of library initialization (T222)
   * Fix parsing of subsecond times in SFTP (T219)

ConfigureChecks.cmake

@@ -101,53 +101,53 @@ if (OPENSSL_FOUND)
     check_include_file(openssl/ecdsa.h HAVE_OPENSSL_ECDSA_H)
 
     set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
-    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARIES})
     check_function_exists(EVP_aes_128_ctr HAVE_OPENSSL_EVP_AES_CTR)
 
     set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
-    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARIES})
     check_function_exists(EVP_aes_128_cbc HAVE_OPENSSL_EVP_AES_CBC)
 
     set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
-    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARIES})
     check_function_exists(EVP_aes_128_gcm HAVE_OPENSSL_EVP_AES_GCM)
 
     set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
-    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARIES})
     check_function_exists(CRYPTO_THREADID_set_callback HAVE_OPENSSL_CRYPTO_THREADID_SET_CALLBACK)
 
     set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
-    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARIES})
     check_function_exists(CRYPTO_ctr128_encrypt HAVE_OPENSSL_CRYPTO_CTR128_ENCRYPT)
 
     set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
-    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARIES})
     check_function_exists(EVP_CIPHER_CTX_new HAVE_OPENSSL_EVP_CIPHER_CTX_NEW)
 
     set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
-    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARIES})
     check_function_exists(EVP_KDF_CTX_new_id HAVE_OPENSSL_EVP_KDF_CTX_NEW_ID)
 
     set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
-    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARIES})
     check_function_exists(FIPS_mode HAVE_OPENSSL_FIPS_MODE)
 
     set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
-    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARIES})
     check_function_exists(RAND_priv_bytes HAVE_OPENSSL_RAND_PRIV_BYTES)
 
     set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
-    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARIES})
     check_function_exists(EVP_DigestSign HAVE_OPENSSL_EVP_DIGESTSIGN)
 
     set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
-    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARIES})
     check_function_exists(EVP_DigestVerify HAVE_OPENSSL_EVP_DIGESTVERIFY)
 
     check_function_exists(OPENSSL_ia32cap_loc HAVE_OPENSSL_IA32CAP_LOC)
 
     set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
-    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARIES})
     check_symbol_exists(EVP_PKEY_ED25519 "openssl/evp.h" FOUND_OPENSSL_ED25519)
 
     if (HAVE_OPENSSL_EVP_DIGESTSIGN AND HAVE_OPENSSL_EVP_DIGESTVERIFY AND
@@ -156,7 +156,7 @@ if (OPENSSL_FOUND)
     endif()
 
     set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
-    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})
+    set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_CRYPTO_LIBRARIES})
     check_symbol_exists(EVP_PKEY_X25519 "openssl/evp.h" HAVE_OPENSSL_X25519)
 
     unset(CMAKE_REQUIRED_INCLUDES)

cmake/Modules/FindABIMap.cmake

@@ -302,12 +302,13 @@ function(get_file_list _TARGET_NAME)
     add_custom_target(
         ${_TARGET_NAME}_int ALL
         COMMAND ${CMAKE_COMMAND}
-          -DOUTPUT_PATH="${_get_files_list_OUTPUT_PATH}"
-          -DDIRECTORIES="${_get_files_list_DIRECTORIES}"
-          -DFILES_PATTERNS="${_get_files_list_FILES_PATTERNS}"
+          -DOUTPUT_PATH=${_get_files_list_OUTPUT_PATH}
+          -DDIRECTORIES=${_get_files_list_DIRECTORIES}
+          -DFILES_PATTERNS=${_get_files_list_FILES_PATTERNS}
           -P ${_GET_FILES_LIST_SCRIPT}
         COMMENT
           "Searching for files"
+        VERBATIM
     )
 
     if (DEFINED _get_files_list_COPY_TO)
@@ -318,6 +319,7 @@ function(get_file_list _TARGET_NAME)
               ${_FILES_LIST_OUTPUT_PATH} ${_get_files_list_COPY_TO}
             DEPENDS ${_TARGET_NAME}_int
             COMMENT "Copying ${_TARGET_NAME} to ${_get_files_list_COPY_TO}"
+            VERBATIM
         )
     else()
         add_custom_target(${_TARGET_NAME} ALL
@@ -369,12 +371,13 @@ function(extract_symbols _TARGET_NAME)
     add_custom_target(
         ${_TARGET_NAME}_int ALL
         COMMAND ${CMAKE_COMMAND}
-          -DOUTPUT_PATH="${_SYMBOLS_OUTPUT_PATH}"
-          -DHEADERS_LIST_FILE="${_HEADERS_LIST_FILE}"
+          -DOUTPUT_PATH=${_SYMBOLS_OUTPUT_PATH}
+          -DHEADERS_LIST_FILE=${_HEADERS_LIST_FILE}
           -DFILTER_PATTERN=${_extract_symbols_FILTER_PATTERN}
           -P ${_EXTRACT_SYMBOLS_SCRIPT}
         DEPENDS ${_extract_symbols_HEADERS_LIST}
         COMMENT "Extracting symbols from headers"
+        VERBATIM
     )
 
     if (DEFINED _extract_symbols_COPY_TO)
@@ -385,6 +388,7 @@ function(extract_symbols _TARGET_NAME)
               ${_SYMBOLS_OUTPUT_PATH} ${_extract_symbols_COPY_TO}
             DEPENDS ${_TARGET_NAME}_int
             COMMENT "Copying ${_TARGET_NAME} to ${_extract_symbols_COPY_TO}"
+            VERBATIM
         )
     else()
         add_custom_target(${_TARGET_NAME} ALL
@@ -449,35 +453,37 @@ function(generate_map_file _TARGET_NAME)
         ${_TARGET_NAME}_int ALL
         COMMAND ${CMAKE_COMMAND}
           -DABIMAP_EXECUTABLE=${ABIMAP_EXECUTABLE}
-          -DSYMBOLS="${_SYMBOLS_FILE}"
+          -DSYMBOLS=${_SYMBOLS_FILE}
           -DCURRENT_MAP=${_generate_map_file_CURRENT_MAP}
-          -DOUTPUT_PATH="${_MAP_OUTPUT_PATH}"
+          -DOUTPUT_PATH=${_MAP_OUTPUT_PATH}
           -DFINAL=${_generate_map_file_FINAL}
           -DBREAK_ABI=${_generate_map_file_BREAK_ABI}
           -DRELEASE_NAME_VERSION=${_generate_map_file_RELEASE_NAME_VERSION}
           -P ${_GENERATE_MAP_SCRIPT}
         DEPENDS ${_generate_map_file_SYMBOLS}
         COMMENT "Generating the map ${_TARGET_NAME}"
+        VERBATIM
     )
 
     # Add a custom command setting the map as OUTPUT to allow it to be added as
     # a generated source
     add_custom_command(
         OUTPUT ${_MAP_OUTPUT_PATH}
-        DEPENDS ${_TARGET_NAME}
+        DEPENDS ${_TARGET_NAME}_copy
     )
 
     if (DEFINED _generate_map_file_COPY_TO)
         # Copy the generated map back to the COPY_TO
-        add_custom_target(${_TARGET_NAME} ALL
+        add_custom_target(${_TARGET_NAME}_copy ALL
             COMMAND
               ${CMAKE_COMMAND} -E copy_if_different ${_MAP_OUTPUT_PATH}
               ${_generate_map_file_COPY_TO}
             DEPENDS ${_TARGET_NAME}_int
             COMMENT "Copying ${_MAP_OUTPUT_PATH} to ${_generate_map_file_COPY_TO}"
+            VERBATIM
         )
     else()
-        add_custom_target(${_TARGET_NAME} ALL
+        add_custom_target(${_TARGET_NAME}_copy ALL
             DEPENDS ${_TARGET_NAME}_int
         )
     endif()

examples/libssh_scp.c

@@ -233,7 +233,7 @@ static int open_location(struct location *loc, int flag) {
         loc->file = fopen(loc->path, flag == READ ? "r":"w");
         if (!loc->file) {
             if (errno == EISDIR) {
-                if (chdir(loc->path)) {
+                if (loc->path != NULL && chdir(loc->path)) {
                     fprintf(stderr,
                             "Error changing directory to %s: %s\n",
                             loc->path, strerror(errno));

examples/sshd_direct-tcpip.c

@@ -88,7 +88,11 @@ cleanup_push(struct cleanup_node_struct** head_ref,
     // Allocate memory for node
     struct cleanup_node_struct *new_node = malloc(sizeof *new_node);
 
-    new_node->next = (*head_ref);
+    if (head_ref != NULL) {
+        new_node->next = *head_ref;
+    } else {
+        new_node->next = NULL;
+    }
 
     // Copy new_data
     new_node->data = new_data;
@@ -514,6 +518,12 @@ message_callback(UNUSED_PARAM(ssh_session session),
                 pFd = malloc(sizeof *pFd);
                 cb_chan = malloc(sizeof *cb_chan);
                 event_fd_data = malloc(sizeof *event_fd_data);
+                if (pFd == NULL || cb_chan == NULL || event_fd_data == NULL) {
+                    SAFE_FREE(pFd);
+                    SAFE_FREE(cb_chan);
+                    SAFE_FREE(event_fd_data);
+                    return 1;
+                }
 
                 (*pFd) = socket_fd;
                 event_fd_data->channel = channel;

examples/sshnetcat.c

@@ -233,9 +233,10 @@ void set_pcap(ssh_session session){
 }
 
 void cleanup_pcap(void);
-void cleanup_pcap(){
+void cleanup_pcap(void)
+{
 	ssh_pcap_file_free(pcap);
-	pcap=NULL;
+	pcap = NULL;
 }
 #endif
 

include/libssh/crypto.h

@@ -126,8 +126,9 @@ struct ssh_crypto_struct {
     ssh_curve25519_pubkey curve25519_server_pubkey;
 #endif
     ssh_string dh_server_signature; /* information used by dh_handshake. */
-    size_t digest_len; /* len of the two fields below */
+    size_t session_id_len;
     unsigned char *session_id;
+    size_t digest_len; /* len of the secret hash */
     unsigned char *secret_hash; /* Secret hash is same as session id until re-kex */
     unsigned char *encryptIV;
     unsigned char *decryptIV;

include/libssh/curve25519.h

@@ -48,6 +48,7 @@ typedef unsigned char ssh_curve25519_privkey[CURVE25519_PRIVKEY_SIZE];
 
 
 int ssh_client_curve25519_init(ssh_session session);
+void ssh_client_curve25519_remove_callbacks(ssh_session session);
 
 #ifdef WITH_SERVER
 void ssh_server_curve25519_init(ssh_session session);

include/libssh/dh-gex.h

@@ -24,6 +24,7 @@
 #define SRC_DH_GEX_H_
 
 int ssh_client_dhgex_init(ssh_session session);
+void ssh_client_dhgex_remove_callbacks(ssh_session session);
 
 #ifdef WITH_SERVER
 void ssh_server_dhgex_init(ssh_session session);

include/libssh/dh.h

@@ -63,8 +63,10 @@ int ssh_dh_get_current_server_publickey_blob(ssh_session session,
 ssh_key ssh_dh_get_next_server_publickey(ssh_session session);
 int ssh_dh_get_next_server_publickey_blob(ssh_session session,
                                           ssh_string *pubkey_blob);
+int dh_handshake(ssh_session session);
 
 int ssh_client_dh_init(ssh_session session);
+void ssh_client_dh_remove_callbacks(ssh_session session);
 #ifdef WITH_SERVER
 void ssh_server_dh_init(ssh_session session);
 #endif /* WITH_SERVER */

include/libssh/ecdh.h

@@ -45,6 +45,7 @@
 extern struct ssh_packet_callbacks_struct ssh_ecdh_client_callbacks;
 /* Backend-specific functions.  */
 int ssh_client_ecdh_init(ssh_session session);
+void ssh_client_ecdh_remove_callbacks(ssh_session session);
 int ecdh_build_k(ssh_session session);
 
 #ifdef WITH_SERVER

include/libssh/kex.h

@@ -33,7 +33,7 @@ struct ssh_kex_struct {
 
 SSH_PACKET_CALLBACK(ssh_packet_kexinit);
 
-int ssh_send_kex(ssh_session session, int server_kex);
+int ssh_send_kex(ssh_session session);
 void ssh_list_kex(struct ssh_kex_struct *kex);
 int ssh_set_client_kex(ssh_session session);
 int ssh_kex_select_methods(ssh_session session);

include/libssh/libssh.h

@@ -1,7 +1,7 @@
 /*
  * This file is part of the SSH Library
  *
- * Copyright (c) 2003-2009 by Aris Adamantiadis
+ * Copyright (c) 2003-2021 by Aris Adamantiadis and the libssh team
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public

include/libssh/packet.h

@@ -80,7 +80,7 @@ int ssh_packet_decrypt(ssh_session session, uint8_t *destination, uint8_t *sourc
         size_t start, size_t encrypted_size);
 unsigned char *ssh_packet_encrypt(ssh_session session,
                                   void *packet,
-                                  unsigned int len);
+                                  uint32_t len);
 int ssh_packet_hmac_verify(ssh_session session, const void *data, size_t len,
                            unsigned char *mac, enum ssh_hmac_e type);
 int ssh_packet_set_newkeys(ssh_session session,

include/libssh/pki.h

@@ -125,6 +125,8 @@ enum ssh_digest_e ssh_key_hash_from_name(const char *name);
 /* SSH Signature Functions */
 ssh_signature ssh_signature_new(void);
 void ssh_signature_free(ssh_signature sign);
+#define SSH_SIGNATURE_FREE(x) \
+    do { ssh_signature_free(x); x = NULL; } while(0)
 
 int ssh_pki_export_signature_blob(const ssh_signature sign,
                                   ssh_string *sign_blob);

include/libssh/session.h

@@ -75,6 +75,11 @@ enum ssh_pending_call_e {
 /* Client successfully authenticated */
 #define SSH_SESSION_FLAG_AUTHENTICATED 2
 
+/* The KEXINIT message can be sent first by either of the parties so this flag
+ * indicates that the message was already sent to make sure it is sent and avoid
+ * sending it twice during key exchange to simplify the state machine. */
+#define SSH_SESSION_FLAG_KEXINIT_SENT 4
+
 /* codes to use with ssh_handle_packets*() */
 /* Infinite timeout */
 #define SSH_TIMEOUT_INFINITE -1
@@ -131,10 +136,8 @@ struct ssh_session_struct {
     /* Extensions negotiated using RFC 8308 */
     uint32_t extensions;
 
-    ssh_string banner; /* that's the issue banner from
-                       the server */
-    char *discon_msg; /* disconnect message from
-                         the remote host */
+    ssh_string banner; /* that's the issue banner from the server */
+    char *discon_msg; /* disconnect message from the remote host */
     ssh_buffer in_buffer;
     PACKET in_packet;
     ssh_buffer out_buffer;
@@ -158,25 +161,33 @@ struct ssh_session_struct {
         uint32_t current_method;
     } auth;
 
+    /* Sending this flag before key exchange to save one round trip during the
+     * key exchange. This might make sense on high-latency connections.
+     * So far internal only for testing. Usable only on the client side --
+     * there is no key exchange method that would start with server message */
+    bool send_first_kex_follows;
     /*
      * RFC 4253, 7.1: if the first_kex_packet_follows flag was set in
      * the received SSH_MSG_KEXINIT, but the guess was wrong, this
      * field will be set such that the following guessed packet will
-     * be ignored.  Once that packet has been received and ignored,
-     * this field is cleared.
+     * be ignored on the receiving side.  Once that packet has been received and
+     * ignored, this field is cleared.
+     * On the sending side, this is set after we got peer KEXINIT message and we
+     * need to resend the initial message of the negotiated KEX algorithm.
      */
-    int first_kex_follows_guess_wrong;
+    bool first_kex_follows_guess_wrong;
 
     ssh_buffer in_hashbuf;
     ssh_buffer out_hashbuf;
     struct ssh_crypto_struct *current_crypto;
-    struct ssh_crypto_struct *next_crypto;  /* next_crypto is going to be used after a SSH2_MSG_NEWKEYS */
+    /* next_crypto is going to be used after a SSH2_MSG_NEWKEYS */
+    struct ssh_crypto_struct *next_crypto;
 
     struct ssh_list *channels; /* linked list of channels */
     int maxchannel;
     ssh_agent agent; /* ssh agent */
 
-/* keyb interactive data */
+    /* keyboard interactive data */
     struct ssh_kbdint_struct *kbdint;
     struct ssh_gssapi_struct *gssapi;
 
@@ -193,7 +204,8 @@ struct ssh_session_struct {
 
     /* auths accepted by server */
     struct ssh_list *ssh_message_list; /* list of delayed SSH messages */
-    int (*ssh_message_callback)( struct ssh_session_struct *session, ssh_message msg, void *userdata);
+    int (*ssh_message_callback)(struct ssh_session_struct *session,
+                                ssh_message msg, void *userdata);
     void *ssh_message_callback_data;
     ssh_server_callbacks server_callbacks;
     void (*ssh_connection_callback)( struct ssh_session_struct *session);
@@ -219,7 +231,7 @@ struct ssh_session_struct {
         char *custombanner;
         unsigned long timeout; /* seconds */
         unsigned long timeout_usec;
-        unsigned int port;
+        uint16_t port;
         socket_t fd;
         int StrictHostKeyChecking;
         char compressionlevel;

src/ABI/current

@@ -1 +1 @@
-4.8.6
+4.8.8

src/ABI/libssh-4.8.7.symbols

@@ -0,0 +1,421 @@
+_ssh_log
+buffer_free
+buffer_get
+buffer_get_len
+buffer_new
+channel_accept_x11
+channel_change_pty_size
+channel_close
+channel_forward_accept
+channel_forward_cancel
+channel_forward_listen
+channel_free
+channel_get_exit_status
+channel_get_session
+channel_is_closed
+channel_is_eof
+channel_is_open
+channel_new
+channel_open_forward
+channel_open_session
+channel_poll
+channel_read
+channel_read_buffer
+channel_read_nonblocking
+channel_request_env
+channel_request_exec
+channel_request_pty
+channel_request_pty_size
+channel_request_send_signal
+channel_request_sftp
+channel_request_shell
+channel_request_subsystem
+channel_request_x11
+channel_select
+channel_send_eof
+channel_set_blocking
+channel_write
+channel_write_stderr
+privatekey_free
+privatekey_from_file
+publickey_free
+publickey_from_file
+publickey_from_privatekey
+publickey_to_string
+sftp_async_read
+sftp_async_read_begin
+sftp_attributes_free
+sftp_canonicalize_path
+sftp_chmod
+sftp_chown
+sftp_client_message_free
+sftp_client_message_get_data
+sftp_client_message_get_filename
+sftp_client_message_get_flags
+sftp_client_message_get_submessage
+sftp_client_message_get_type
+sftp_client_message_set_filename
+sftp_close
+sftp_closedir
+sftp_dir_eof
+sftp_extension_supported
+sftp_extensions_get_count
+sftp_extensions_get_data
+sftp_extensions_get_name
+sftp_file_set_blocking
+sftp_file_set_nonblocking
+sftp_free
+sftp_fstat
+sftp_fstatvfs
+sftp_fsync
+sftp_get_client_message
+sftp_get_error
+sftp_handle
+sftp_handle_alloc
+sftp_handle_remove
+sftp_init
+sftp_lstat
+sftp_mkdir
+sftp_new
+sftp_new_channel
+sftp_open
+sftp_opendir
+sftp_read
+sftp_readdir
+sftp_readlink
+sftp_rename
+sftp_reply_attr
+sftp_reply_data
+sftp_reply_handle
+sftp_reply_name
+sftp_reply_names
+sftp_reply_names_add
+sftp_reply_status
+sftp_rewind
+sftp_rmdir
+sftp_seek
+sftp_seek64
+sftp_send_client_message
+sftp_server_free
+sftp_server_init
+sftp_server_new
+sftp_server_version
+sftp_setstat
+sftp_stat
+sftp_statvfs
+sftp_statvfs_free
+sftp_symlink
+sftp_tell
+sftp_tell64
+sftp_unlink
+sftp_utimes
+sftp_write
+ssh_accept
+ssh_add_channel_callbacks
+ssh_auth_list
+ssh_basename
+ssh_bind_accept
+ssh_bind_accept_fd
+ssh_bind_fd_toaccept
+ssh_bind_free
+ssh_bind_get_fd
+ssh_bind_listen
+ssh_bind_new
+ssh_bind_options_parse_config
+ssh_bind_options_set
+ssh_bind_set_blocking
+ssh_bind_set_callbacks
+ssh_bind_set_fd
+ssh_blocking_flush
+ssh_buffer_add_data
+ssh_buffer_free
+ssh_buffer_get
+ssh_buffer_get_data
+ssh_buffer_get_len
+ssh_buffer_new
+ssh_buffer_reinit
+ssh_channel_accept_forward
+ssh_channel_accept_x11
+ssh_channel_cancel_forward
+ssh_channel_change_pty_size
+ssh_channel_close
+ssh_channel_free
+ssh_channel_get_exit_status
+ssh_channel_get_session
+ssh_channel_is_closed
+ssh_channel_is_eof
+ssh_channel_is_open
+ssh_channel_listen_forward
+ssh_channel_new
+ssh_channel_open_auth_agent
+ssh_channel_open_forward
+ssh_channel_open_forward_unix
+ssh_channel_open_reverse_forward
+ssh_channel_open_session
+ssh_channel_open_x11
+ssh_channel_poll
+ssh_channel_poll_timeout
+ssh_channel_read
+ssh_channel_read_nonblocking
+ssh_channel_read_timeout
+ssh_channel_request_auth_agent
+ssh_channel_request_env
+ssh_channel_request_exec
+ssh_channel_request_pty
+ssh_channel_request_pty_size
+ssh_channel_request_send_break
+ssh_channel_request_send_exit_signal
+ssh_channel_request_send_exit_status
+ssh_channel_request_send_signal
+ssh_channel_request_sftp
+ssh_channel_request_shell
+ssh_channel_request_subsystem
+ssh_channel_request_x11
+ssh_channel_select
+ssh_channel_send_eof
+ssh_channel_set_blocking
+ssh_channel_set_counter
+ssh_channel_window_size
+ssh_channel_write
+ssh_channel_write_stderr
+ssh_clean_pubkey_hash
+ssh_connect
+ssh_connector_free
+ssh_connector_new
+ssh_connector_set_in_channel
+ssh_connector_set_in_fd
+ssh_connector_set_out_channel
+ssh_connector_set_out_fd
+ssh_copyright
+ssh_dirname
+ssh_disconnect
+ssh_dump_knownhost
+ssh_event_add_connector
+ssh_event_add_fd
+ssh_event_add_session
+ssh_event_dopoll
+ssh_event_free
+ssh_event_new
+ssh_event_remove_connector
+ssh_event_remove_fd
+ssh_event_remove_session
+ssh_execute_message_callbacks
+ssh_finalize
+ssh_forward_accept
+ssh_forward_cancel
+ssh_forward_listen
+ssh_free
+ssh_get_cipher_in
+ssh_get_cipher_out
+ssh_get_clientbanner
+ssh_get_disconnect_message
+ssh_get_error
+ssh_get_error_code
+ssh_get_fd
+ssh_get_fingerprint_hash
+ssh_get_hexa
+ssh_get_hmac_in
+ssh_get_hmac_out
+ssh_get_issue_banner
+ssh_get_kex_algo
+ssh_get_log_callback
+ssh_get_log_level
+ssh_get_log_userdata
+ssh_get_openssh_version
+ssh_get_poll_flags
+ssh_get_pubkey
+ssh_get_pubkey_hash
+ssh_get_publickey
+ssh_get_publickey_hash
+ssh_get_random
+ssh_get_server_publickey
+ssh_get_serverbanner
+ssh_get_status
+ssh_get_version
+ssh_getpass
+ssh_gssapi_get_creds
+ssh_gssapi_set_creds
+ssh_handle_key_exchange
+ssh_init
+ssh_is_blocking
+ssh_is_connected
+ssh_is_server_known
+ssh_key_cmp
+ssh_key_free
+ssh_key_is_private
+ssh_key_is_public
+ssh_key_new
+ssh_key_type
+ssh_key_type_from_name
+ssh_key_type_to_char
+ssh_known_hosts_parse_line
+ssh_knownhosts_entry_free
+ssh_log
+ssh_message_auth_interactive_request
+ssh_message_auth_kbdint_is_response
+ssh_message_auth_password
+ssh_message_auth_pubkey
+ssh_message_auth_publickey
+ssh_message_auth_publickey_state
+ssh_message_auth_reply_pk_ok
+ssh_message_auth_reply_pk_ok_simple
+ssh_message_auth_reply_success
+ssh_message_auth_set_methods
+ssh_message_auth_user
+ssh_message_channel_request_channel
+ssh_message_channel_request_command
+ssh_message_channel_request_env_name
+ssh_message_channel_request_env_value
+ssh_message_channel_request_open_destination
+ssh_message_channel_request_open_destination_port
+ssh_message_channel_request_open_originator
+ssh_message_channel_request_open_originator_port
+ssh_message_channel_request_open_reply_accept
+ssh_message_channel_request_open_reply_accept_channel
+ssh_message_channel_request_pty_height
+ssh_message_channel_request_pty_pxheight
+ssh_message_channel_request_pty_pxwidth
+ssh_message_channel_request_pty_term
+ssh_message_channel_request_pty_width
+ssh_message_channel_request_reply_success
+ssh_message_channel_request_subsystem
+ssh_message_channel_request_x11_auth_cookie
+ssh_message_channel_request_x11_auth_protocol
+ssh_message_channel_request_x11_screen_number
+ssh_message_channel_request_x11_single_connection
+ssh_message_free
+ssh_message_get
+ssh_message_global_request_address
+ssh_message_global_request_port
+ssh_message_global_request_reply_success
+ssh_message_reply_default
+ssh_message_retrieve
+ssh_message_service_reply_success
+ssh_message_service_service
+ssh_message_subtype
+ssh_message_type
+ssh_mkdir
+ssh_new
+ssh_options_copy
+ssh_options_get
+ssh_options_get_port
+ssh_options_getopt
+ssh_options_parse_config
+ssh_options_set
+ssh_pcap_file_close
+ssh_pcap_file_free
+ssh_pcap_file_new
+ssh_pcap_file_open
+ssh_pki_copy_cert_to_privkey
+ssh_pki_export_privkey_base64
+ssh_pki_export_privkey_file
+ssh_pki_export_privkey_to_pubkey
+ssh_pki_export_pubkey_base64
+ssh_pki_export_pubkey_file
+ssh_pki_generate
+ssh_pki_import_cert_base64
+ssh_pki_import_cert_file
+ssh_pki_import_privkey_base64
+ssh_pki_import_privkey_file
+ssh_pki_import_pubkey_base64
+ssh_pki_import_pubkey_file
+ssh_pki_key_ecdsa_name
+ssh_print_hash
+ssh_print_hexa
+ssh_privatekey_type
+ssh_publickey_to_file
+ssh_remove_channel_callbacks
+ssh_scp_accept_request
+ssh_scp_close
+ssh_scp_deny_request
+ssh_scp_free
+ssh_scp_init
+ssh_scp_leave_directory
+ssh_scp_new
+ssh_scp_pull_request
+ssh_scp_push_directory
+ssh_scp_push_file
+ssh_scp_push_file64
+ssh_scp_read
+ssh_scp_request_get_filename
+ssh_scp_request_get_permissions
+ssh_scp_request_get_size
+ssh_scp_request_get_size64
+ssh_scp_request_get_warning
+ssh_scp_write
+ssh_select
+ssh_send_debug
+ssh_send_ignore
+ssh_send_keepalive
+ssh_server_init_kex
+ssh_service_request
+ssh_session_export_known_hosts_entry
+ssh_session_get_known_hosts_entry
+ssh_session_has_known_hosts_entry
+ssh_session_is_known_server
+ssh_session_update_known_hosts
+ssh_set_agent_channel
+ssh_set_agent_socket
+ssh_set_auth_methods
+ssh_set_blocking
+ssh_set_callbacks
+ssh_set_channel_callbacks
+ssh_set_counters
+ssh_set_fd_except
+ssh_set_fd_toread
+ssh_set_fd_towrite
+ssh_set_log_callback
+ssh_set_log_level
+ssh_set_log_userdata
+ssh_set_message_callback
+ssh_set_pcap_file
+ssh_set_server_callbacks
+ssh_silent_disconnect
+ssh_string_burn
+ssh_string_copy
+ssh_string_data
+ssh_string_fill
+ssh_string_free
+ssh_string_free_char
+ssh_string_from_char
+ssh_string_get_char
+ssh_string_len
+ssh_string_new
+ssh_string_to_char
+ssh_threads_get_default
+ssh_threads_get_noop
+ssh_threads_get_pthread
+ssh_threads_set_callbacks
+ssh_try_publickey_from_file
+ssh_userauth_agent
+ssh_userauth_agent_pubkey
+ssh_userauth_autopubkey
+ssh_userauth_gssapi
+ssh_userauth_kbdint
+ssh_userauth_kbdint_getanswer
+ssh_userauth_kbdint_getinstruction
+ssh_userauth_kbdint_getname
+ssh_userauth_kbdint_getnanswers
+ssh_userauth_kbdint_getnprompts
+ssh_userauth_kbdint_getprompt
+ssh_userauth_kbdint_setanswer
+ssh_userauth_list
+ssh_userauth_none
+ssh_userauth_offer_pubkey
+ssh_userauth_password
+ssh_userauth_privatekey_file
+ssh_userauth_pubkey
+ssh_userauth_publickey
+ssh_userauth_publickey_auto
+ssh_userauth_try_publickey
+ssh_version
+ssh_write_knownhost
+string_burn
+string_copy
+string_data
+string_fill
+string_free
+string_from_char
+string_len
+string_new
+string_to_char

src/ABI/libssh-4.8.8.symbols

@@ -0,0 +1,421 @@
+_ssh_log
+buffer_free
+buffer_get
+buffer_get_len
+buffer_new
+channel_accept_x11
+channel_change_pty_size
+channel_close
+channel_forward_accept
+channel_forward_cancel
+channel_forward_listen
+channel_free
+channel_get_exit_status
+channel_get_session
+channel_is_closed
+channel_is_eof
+channel_is_open
+channel_new
+channel_open_forward
+channel_open_session
+channel_poll
+channel_read
+channel_read_buffer
+channel_read_nonblocking
+channel_request_env
+channel_request_exec
+channel_request_pty
+channel_request_pty_size
+channel_request_send_signal
+channel_request_sftp
+channel_request_shell
+channel_request_subsystem
+channel_request_x11
+channel_select
+channel_send_eof
+channel_set_blocking
+channel_write
+channel_write_stderr
+privatekey_free
+privatekey_from_file
+publickey_free
+publickey_from_file
+publickey_from_privatekey
+publickey_to_string
+sftp_async_read
+sftp_async_read_begin
+sftp_attributes_free
+sftp_canonicalize_path
+sftp_chmod
+sftp_chown
+sftp_client_message_free
+sftp_client_message_get_data
+sftp_client_message_get_filename
+sftp_client_message_get_flags
+sftp_client_message_get_submessage
+sftp_client_message_get_type
+sftp_client_message_set_filename
+sftp_close
+sftp_closedir
+sftp_dir_eof
+sftp_extension_supported
+sftp_extensions_get_count
+sftp_extensions_get_data
+sftp_extensions_get_name
+sftp_file_set_blocking
+sftp_file_set_nonblocking
+sftp_free
+sftp_fstat
+sftp_fstatvfs
+sftp_fsync
+sftp_get_client_message
+sftp_get_error
+sftp_handle
+sftp_handle_alloc
+sftp_handle_remove
+sftp_init
+sftp_lstat
+sftp_mkdir
+sftp_new
+sftp_new_channel
+sftp_open
+sftp_opendir
+sftp_read
+sftp_readdir
+sftp_readlink
+sftp_rename
+sftp_reply_attr
+sftp_reply_data
+sftp_reply_handle
+sftp_reply_name
+sftp_reply_names
+sftp_reply_names_add
+sftp_reply_status
+sftp_rewind
+sftp_rmdir
+sftp_seek
+sftp_seek64
+sftp_send_client_message
+sftp_server_free
+sftp_server_init
+sftp_server_new
+sftp_server_version
+sftp_setstat
+sftp_stat
+sftp_statvfs
+sftp_statvfs_free
+sftp_symlink
+sftp_tell
+sftp_tell64
+sftp_unlink
+sftp_utimes
+sftp_write
+ssh_accept
+ssh_add_channel_callbacks
+ssh_auth_list
+ssh_basename
+ssh_bind_accept
+ssh_bind_accept_fd
+ssh_bind_fd_toaccept
+ssh_bind_free
+ssh_bind_get_fd
+ssh_bind_listen
+ssh_bind_new
+ssh_bind_options_parse_config
+ssh_bind_options_set
+ssh_bind_set_blocking
+ssh_bind_set_callbacks
+ssh_bind_set_fd
+ssh_blocking_flush
+ssh_buffer_add_data
+ssh_buffer_free
+ssh_buffer_get
+ssh_buffer_get_data
+ssh_buffer_get_len
+ssh_buffer_new
+ssh_buffer_reinit
+ssh_channel_accept_forward
+ssh_channel_accept_x11
+ssh_channel_cancel_forward
+ssh_channel_change_pty_size
+ssh_channel_close
+ssh_channel_free
+ssh_channel_get_exit_status
+ssh_channel_get_session
+ssh_channel_is_closed
+ssh_channel_is_eof
+ssh_channel_is_open
+ssh_channel_listen_forward
+ssh_channel_new
+ssh_channel_open_auth_agent
+ssh_channel_open_forward
+ssh_channel_open_forward_unix
+ssh_channel_open_reverse_forward
+ssh_channel_open_session
+ssh_channel_open_x11
+ssh_channel_poll
+ssh_channel_poll_timeout
+ssh_channel_read
+ssh_channel_read_nonblocking
+ssh_channel_read_timeout
+ssh_channel_request_auth_agent
+ssh_channel_request_env
+ssh_channel_request_exec
+ssh_channel_request_pty
+ssh_channel_request_pty_size
+ssh_channel_request_send_break
+ssh_channel_request_send_exit_signal
+ssh_channel_request_send_exit_status
+ssh_channel_request_send_signal
+ssh_channel_request_sftp
+ssh_channel_request_shell
+ssh_channel_request_subsystem
+ssh_channel_request_x11
+ssh_channel_select
+ssh_channel_send_eof
+ssh_channel_set_blocking
+ssh_channel_set_counter
+ssh_channel_window_size
+ssh_channel_write
+ssh_channel_write_stderr
+ssh_clean_pubkey_hash
+ssh_connect
+ssh_connector_free
+ssh_connector_new
+ssh_connector_set_in_channel
+ssh_connector_set_in_fd
+ssh_connector_set_out_channel
+ssh_connector_set_out_fd
+ssh_copyright
+ssh_dirname
+ssh_disconnect
+ssh_dump_knownhost
+ssh_event_add_connector
+ssh_event_add_fd
+ssh_event_add_session
+ssh_event_dopoll
+ssh_event_free
+ssh_event_new
+ssh_event_remove_connector
+ssh_event_remove_fd
+ssh_event_remove_session
+ssh_execute_message_callbacks
+ssh_finalize
+ssh_forward_accept
+ssh_forward_cancel
+ssh_forward_listen
+ssh_free
+ssh_get_cipher_in
+ssh_get_cipher_out
+ssh_get_clientbanner
+ssh_get_disconnect_message
+ssh_get_error
+ssh_get_error_code
+ssh_get_fd
+ssh_get_fingerprint_hash
+ssh_get_hexa
+ssh_get_hmac_in
+ssh_get_hmac_out
+ssh_get_issue_banner
+ssh_get_kex_algo
+ssh_get_log_callback
+ssh_get_log_level
+ssh_get_log_userdata
+ssh_get_openssh_version
+ssh_get_poll_flags
+ssh_get_pubkey
+ssh_get_pubkey_hash
+ssh_get_publickey
+ssh_get_publickey_hash
+ssh_get_random
+ssh_get_server_publickey
+ssh_get_serverbanner
+ssh_get_status
+ssh_get_version
+ssh_getpass
+ssh_gssapi_get_creds
+ssh_gssapi_set_creds
+ssh_handle_key_exchange
+ssh_init
+ssh_is_blocking
+ssh_is_connected
+ssh_is_server_known
+ssh_key_cmp
+ssh_key_free
+ssh_key_is_private
+ssh_key_is_public
+ssh_key_new
+ssh_key_type
+ssh_key_type_from_name
+ssh_key_type_to_char
+ssh_known_hosts_parse_line
+ssh_knownhosts_entry_free
+ssh_log
+ssh_message_auth_interactive_request
+ssh_message_auth_kbdint_is_response
+ssh_message_auth_password
+ssh_message_auth_pubkey
+ssh_message_auth_publickey
+ssh_message_auth_publickey_state
+ssh_message_auth_reply_pk_ok
+ssh_message_auth_reply_pk_ok_simple
+ssh_message_auth_reply_success
+ssh_message_auth_set_methods
+ssh_message_auth_user
+ssh_message_channel_request_channel
+ssh_message_channel_request_command
+ssh_message_channel_request_env_name
+ssh_message_channel_request_env_value
+ssh_message_channel_request_open_destination
+ssh_message_channel_request_open_destination_port
+ssh_message_channel_request_open_originator
+ssh_message_channel_request_open_originator_port
+ssh_message_channel_request_open_reply_accept
+ssh_message_channel_request_open_reply_accept_channel
+ssh_message_channel_request_pty_height
+ssh_message_channel_request_pty_pxheight
+ssh_message_channel_request_pty_pxwidth
+ssh_message_channel_request_pty_term
+ssh_message_channel_request_pty_width
+ssh_message_channel_request_reply_success
+ssh_message_channel_request_subsystem
+ssh_message_channel_request_x11_auth_cookie
+ssh_message_channel_request_x11_auth_protocol
+ssh_message_channel_request_x11_screen_number
+ssh_message_channel_request_x11_single_connection
+ssh_message_free
+ssh_message_get
+ssh_message_global_request_address
+ssh_message_global_request_port
+ssh_message_global_request_reply_success
+ssh_message_reply_default
+ssh_message_retrieve
+ssh_message_service_reply_success
+ssh_message_service_service
+ssh_message_subtype
+ssh_message_type
+ssh_mkdir
+ssh_new
+ssh_options_copy
+ssh_options_get
+ssh_options_get_port
+ssh_options_getopt
+ssh_options_parse_config
+ssh_options_set
+ssh_pcap_file_close
+ssh_pcap_file_free
+ssh_pcap_file_new
+ssh_pcap_file_open
+ssh_pki_copy_cert_to_privkey
+ssh_pki_export_privkey_base64
+ssh_pki_export_privkey_file
+ssh_pki_export_privkey_to_pubkey
+ssh_pki_export_pubkey_base64
+ssh_pki_export_pubkey_file
+ssh_pki_generate
+ssh_pki_import_cert_base64
+ssh_pki_import_cert_file
+ssh_pki_import_privkey_base64
+ssh_pki_import_privkey_file
+ssh_pki_import_pubkey_base64
+ssh_pki_import_pubkey_file
+ssh_pki_key_ecdsa_name
+ssh_print_hash
+ssh_print_hexa
+ssh_privatekey_type
+ssh_publickey_to_file
+ssh_remove_channel_callbacks
+ssh_scp_accept_request
+ssh_scp_close
+ssh_scp_deny_request
+ssh_scp_free
+ssh_scp_init
+ssh_scp_leave_directory
+ssh_scp_new
+ssh_scp_pull_request
+ssh_scp_push_directory
+ssh_scp_push_file
+ssh_scp_push_file64
+ssh_scp_read
+ssh_scp_request_get_filename
+ssh_scp_request_get_permissions
+ssh_scp_request_get_size
+ssh_scp_request_get_size64
+ssh_scp_request_get_warning
+ssh_scp_write
+ssh_select
+ssh_send_debug
+ssh_send_ignore
+ssh_send_keepalive
+ssh_server_init_kex
+ssh_service_request
+ssh_session_export_known_hosts_entry
+ssh_session_get_known_hosts_entry
+ssh_session_has_known_hosts_entry
+ssh_session_is_known_server
+ssh_session_update_known_hosts
+ssh_set_agent_channel
+ssh_set_agent_socket
+ssh_set_auth_methods
+ssh_set_blocking
+ssh_set_callbacks
+ssh_set_channel_callbacks
+ssh_set_counters
+ssh_set_fd_except
+ssh_set_fd_toread
+ssh_set_fd_towrite
+ssh_set_log_callback
+ssh_set_log_level
+ssh_set_log_userdata
+ssh_set_message_callback
+ssh_set_pcap_file
+ssh_set_server_callbacks
+ssh_silent_disconnect
+ssh_string_burn
+ssh_string_copy
+ssh_string_data
+ssh_string_fill
+ssh_string_free
+ssh_string_free_char
+ssh_string_from_char
+ssh_string_get_char
+ssh_string_len
+ssh_string_new
+ssh_string_to_char
+ssh_threads_get_default
+ssh_threads_get_noop
+ssh_threads_get_pthread
+ssh_threads_set_callbacks
+ssh_try_publickey_from_file
+ssh_userauth_agent
+ssh_userauth_agent_pubkey
+ssh_userauth_autopubkey
+ssh_userauth_gssapi
+ssh_userauth_kbdint
+ssh_userauth_kbdint_getanswer
+ssh_userauth_kbdint_getinstruction
+ssh_userauth_kbdint_getname
+ssh_userauth_kbdint_getnanswers
+ssh_userauth_kbdint_getnprompts
+ssh_userauth_kbdint_getprompt
+ssh_userauth_kbdint_setanswer
+ssh_userauth_list
+ssh_userauth_none
+ssh_userauth_offer_pubkey
+ssh_userauth_password
+ssh_userauth_privatekey_file
+ssh_userauth_pubkey
+ssh_userauth_publickey
+ssh_userauth_publickey_auto
+ssh_userauth_try_publickey
+ssh_version
+ssh_write_knownhost
+string_burn
+string_copy
+string_data
+string_fill
+string_free
+string_from_char
+string_len
+string_new
+string_to_char

src/CMakeLists.txt

@@ -16,7 +16,7 @@ if (WIN32)
   )
 endif (WIN32)
 
-if (OPENSSL_CRYPTO_LIBRARY)
+if (OPENSSL_CRYPTO_LIBRARIES)
   set(LIBSSH_PRIVATE_INCLUDE_DIRS
     ${LIBSSH_PRIVATE_INCLUDE_DIRS}
     ${OPENSSL_INCLUDE_DIR}
@@ -24,9 +24,9 @@ if (OPENSSL_CRYPTO_LIBRARY)
 
   set(LIBSSH_LINK_LIBRARIES
     ${LIBSSH_LINK_LIBRARIES}
-    ${OPENSSL_CRYPTO_LIBRARY}
+    ${OPENSSL_CRYPTO_LIBRARIES}
   )
-endif (OPENSSL_CRYPTO_LIBRARY)
+endif (OPENSSL_CRYPTO_LIBRARIES)
 
 if (MBEDTLS_CRYPTO_LIBRARY)
     set(LIBSSH_PRIVATE_INCLUDE_DIRS
@@ -331,7 +331,7 @@ target_link_libraries(ssh
                       PRIVATE ${LIBSSH_LINK_LIBRARIES})
 
 if (WIN32 AND NOT BUILD_SHARED_LIBS)
-    set_target_properties(ssh PROPERTIES COMPILE_FLAGS "-DLIBSSH_STATIC")
+    target_compile_definitions(ssh PUBLIC "LIBSSH_STATIC")
 endif ()
 
 add_library(ssh::ssh ALIAS ssh)
@@ -342,9 +342,7 @@ if (WITH_SYMBOL_VERSIONING AND HAVE_LD_VERSION_SCRIPT)
         set(MAP_PATH "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}_dev.map")
     endif (ABIMAP_FOUND)
 
-    set_target_properties(ssh
-                          PROPERTIES LINK_FLAGS
-                          "-Wl,--version-script,\"${MAP_PATH}\"")
+    target_link_libraries(ssh PRIVATE "-Wl,--version-script,\"${MAP_PATH}\"")
 endif (WITH_SYMBOL_VERSIONING AND HAVE_LD_VERSION_SCRIPT)
 
 set_target_properties(ssh
@@ -358,12 +356,12 @@ set_target_properties(ssh
 )
 
 if (WITH_VISIBILITY_HIDDEN)
-  set_target_properties(ssh PROPERTIES COMPILE_FLAGS "-fvisibility=hidden")
+    set_target_properties(ssh PROPERTIES C_VISIBILITY_PRESET hidden)
 endif (WITH_VISIBILITY_HIDDEN)
 
 if (MINGW)
-    set_target_properties(ssh PROPERTIES LINK_FLAGS "-Wl,--enable-stdcall-fixup")
-    set_target_properties(ssh PROPERTIES COMPILE_FLAGS "-D_POSIX_SOURCE")
+    target_link_libraries(ssh PRIVATE "-Wl,--enable-stdcall-fixup")
+    target_compile_definitions(ssh PRIVATE "_POSIX_SOURCE")
 endif ()
 
 
@@ -412,12 +410,7 @@ if (BUILD_STATIC_LIB)
   )
 
   if (WIN32)
-    set_target_properties(
-      ssh-static
-        PROPERTIES
-          COMPILE_FLAGS
-            "-DLIBSSH_STATIC"
-    )
+    target_compile_definitions(ssh-static PUBLIC "LIBSSH_STATIC")
   endif (WIN32)
 endif (BUILD_STATIC_LIB)
 

src/channels.c

@@ -29,6 +29,9 @@
 #include <errno.h>
 #include <time.h>
 #include <stdbool.h>
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif /* HAVE_SYS_TIME_H */
 
 #ifndef _WIN32
 #include <netinet/in.h>
@@ -117,6 +120,13 @@ ssh_channel ssh_channel_new(ssh_session session)
 
     if (session->channels == NULL) {
         session->channels = ssh_list_new();
+        if (session->channels == NULL) {
+            ssh_set_error_oom(session);
+            SSH_BUFFER_FREE(channel->stdout_buffer);
+            SSH_BUFFER_FREE(channel->stderr_buffer);
+            SAFE_FREE(channel);
+            return NULL;
+        }
     }
 
     ssh_list_prepend(session->channels, channel);

src/client.c

@@ -243,10 +243,13 @@ end:
  * @warning this function returning is no proof that DH handshake is
  * completed
  */
-static int dh_handshake(ssh_session session) {
-
+int dh_handshake(ssh_session session)
+{
   int rc = SSH_AGAIN;
 
+  SSH_LOG(SSH_LOG_TRACE, "dh_handshake_state = %d, kex_type = %d",
+          session->dh_handshake_state,  session->next_crypto->kex_type);
+
   switch (session->dh_handshake_state) {
     case DH_STATE_INIT:
       switch(session->next_crypto->kex_type){
@@ -386,95 +389,101 @@ static void ssh_client_connection_callback(ssh_session session)
 {
     int rc;
 
-    switch(session->session_state) {
-        case SSH_SESSION_STATE_NONE:
-        case SSH_SESSION_STATE_CONNECTING:
-            break;
-        case SSH_SESSION_STATE_SOCKET_CONNECTED:
-            ssh_set_fd_towrite(session);
-            ssh_send_banner(session, 0);
+    SSH_LOG(SSH_LOG_DEBUG, "session_state=%d", session->session_state);
 
-            break;
-        case SSH_SESSION_STATE_BANNER_RECEIVED:
-            if (session->serverbanner == NULL) {
-                goto error;
-            }
-            set_status(session, 0.4f);
-            SSH_LOG(SSH_LOG_PROTOCOL,
-                    "SSH server banner: %s", session->serverbanner);
+    switch (session->session_state) {
+    case SSH_SESSION_STATE_NONE:
+    case SSH_SESSION_STATE_CONNECTING:
+        break;
+    case SSH_SESSION_STATE_SOCKET_CONNECTED:
+        ssh_set_fd_towrite(session);
+        ssh_send_banner(session, 0);
 
-            /* Here we analyze the different protocols the server allows. */
-            rc = ssh_analyze_banner(session, 0);
-            if (rc < 0) {
-                ssh_set_error(session, SSH_FATAL,
-                        "No version of SSH protocol usable (banner: %s)",
-                        session->serverbanner);
-                goto error;
-            }
+        break;
+    case SSH_SESSION_STATE_BANNER_RECEIVED:
+        if (session->serverbanner == NULL) {
+            goto error;
+        }
+        set_status(session, 0.4f);
+        SSH_LOG(SSH_LOG_PROTOCOL,
+                "SSH server banner: %s", session->serverbanner);
 
-            ssh_packet_register_socket_callback(session, session->socket);
+        /* Here we analyze the different protocols the server allows. */
+        rc = ssh_analyze_banner(session, 0);
+        if (rc < 0) {
+            ssh_set_error(session, SSH_FATAL,
+                          "No version of SSH protocol usable (banner: %s)",
+                          session->serverbanner);
+            goto error;
+        }
 
-            ssh_packet_set_default_callbacks(session);
-            session->session_state = SSH_SESSION_STATE_INITIAL_KEX;
+        ssh_packet_register_socket_callback(session, session->socket);
+
+        ssh_packet_set_default_callbacks(session);
+        session->session_state = SSH_SESSION_STATE_INITIAL_KEX;
+        rc = ssh_set_client_kex(session);
+        if (rc != SSH_OK) {
+            goto error;
+        }
+        rc = ssh_send_kex(session);
+        if (rc < 0) {
+            goto error;
+        }
+        set_status(session, 0.5f);
+
+        break;
+    case SSH_SESSION_STATE_INITIAL_KEX:
+        /* TODO: This state should disappear in favor of get_key handle */
+        break;
+    case SSH_SESSION_STATE_KEXINIT_RECEIVED:
+        set_status(session, 0.6f);
+        ssh_list_kex(&session->next_crypto->server_kex);
+        if ((session->flags & SSH_SESSION_FLAG_KEXINIT_SENT) == 0) {
+            /* in rekeying state if next_crypto client_kex might be empty */
             rc = ssh_set_client_kex(session);
             if (rc != SSH_OK) {
                 goto error;
             }
-            rc = ssh_send_kex(session, 0);
+            rc = ssh_send_kex(session);
             if (rc < 0) {
                 goto error;
             }
-            set_status(session, 0.5f);
-
-            break;
-        case SSH_SESSION_STATE_INITIAL_KEX:
-            /* TODO: This state should disappear in favor of get_key handle */
-            break;
-        case SSH_SESSION_STATE_KEXINIT_RECEIVED:
-            set_status(session,0.6f);
-            ssh_list_kex(&session->next_crypto->server_kex);
-            if (session->next_crypto->client_kex.methods[0] == NULL) {
-                /* in rekeying state if next_crypto client_kex is empty */
-                rc = ssh_set_client_kex(session);
-                if (rc != SSH_OK) {
-                    goto error;
-                }
-                rc = ssh_send_kex(session, 0);
-                if (rc < 0) {
-                    goto error;
-                }
-            }
-            if (ssh_kex_select_methods(session) == SSH_ERROR)
-                goto error;
-            set_status(session,0.8f);
-            session->session_state=SSH_SESSION_STATE_DH;
-            if (dh_handshake(session) == SSH_ERROR) {
-                goto error;
-            }
-            FALL_THROUGH;
-        case SSH_SESSION_STATE_DH:
-            if(session->dh_handshake_state==DH_STATE_FINISHED){
-                set_status(session,1.0f);
-                session->connected = 1;
-                if (session->flags & SSH_SESSION_FLAG_AUTHENTICATED)
-                    session->session_state = SSH_SESSION_STATE_AUTHENTICATED;
-                else
-                    session->session_state=SSH_SESSION_STATE_AUTHENTICATING;
-            }
-            break;
-        case SSH_SESSION_STATE_AUTHENTICATING:
-            break;
-        case SSH_SESSION_STATE_ERROR:
+        }
+        if (ssh_kex_select_methods(session) == SSH_ERROR)
             goto error;
-        default:
-            ssh_set_error(session,SSH_FATAL,"Invalid state %d",session->session_state);
+        set_status(session, 0.8f);
+        session->session_state = SSH_SESSION_STATE_DH;
+
+        /* If the init packet was already sent in previous step, this will be no
+         * operation */
+        if (dh_handshake(session) == SSH_ERROR) {
+            goto error;
+        }
+        FALL_THROUGH;
+    case SSH_SESSION_STATE_DH:
+        if (session->dh_handshake_state == DH_STATE_FINISHED) {
+            set_status(session, 1.0f);
+            session->connected = 1;
+            if (session->flags & SSH_SESSION_FLAG_AUTHENTICATED)
+                session->session_state = SSH_SESSION_STATE_AUTHENTICATED;
+            else
+                session->session_state=SSH_SESSION_STATE_AUTHENTICATING;
+        }
+        break;
+    case SSH_SESSION_STATE_AUTHENTICATING:
+        break;
+    case SSH_SESSION_STATE_ERROR:
+        goto error;
+    default:
+        ssh_set_error(session, SSH_FATAL, "Invalid state %d",
+                      session->session_state);
     }
 
     return;
 error:
     ssh_socket_close(session->socket);
     session->alive = 0;
-    session->session_state=SSH_SESSION_STATE_ERROR;
+    session->session_state = SSH_SESSION_STATE_ERROR;
 
 }
 
@@ -721,6 +730,7 @@ error:
   }
   session->opts.fd = SSH_INVALID_SOCKET;
   session->session_state=SSH_SESSION_STATE_DISCONNECTED;
+  session->pending_call_state = SSH_PENDING_CALL_NONE;
 
   while ((it=ssh_list_get_iterator(session->channels)) != NULL) {
     ssh_channel_do_free(ssh_iterator_value(ssh_channel,it));
@@ -770,7 +780,7 @@ error:
 }
 
 const char *ssh_copyright(void) {
-    return SSH_STRINGIFY(LIBSSH_VERSION) " (c) 2003-2019 "
+    return SSH_STRINGIFY(LIBSSH_VERSION) " (c) 2003-2021 "
            "Aris Adamantiadis, Andreas Schneider "
            "and libssh contributors. "
            "Distributed under the LGPL, please refer to COPYING "

src/config.c

@@ -425,6 +425,7 @@ ssh_config_parse_line(ssh_session session,
       opcode != SOC_HOST &&
       opcode != SOC_MATCH &&
       opcode != SOC_INCLUDE &&
+      opcode != SOC_IDENTITY &&
       opcode > SOC_UNSUPPORTED) { /* Ignore all unknown types here */
       /* Skip all the options that were already applied */
       if (seen[opcode] != 0) {

src/connect.c

@@ -29,6 +29,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif /* HAVE_SYS_TIME_H */
 
 #include "libssh/libssh.h"
 #include "libssh/misc.h"

src/curve25519.c

@@ -172,6 +172,11 @@ int ssh_client_curve25519_init(ssh_session session)
     return rc;
 }
 
+void ssh_client_curve25519_remove_callbacks(ssh_session session)
+{
+    ssh_packet_remove_callbacks(session, &ssh_curve25519_client_callbacks);
+}
+
 static int ssh_curve25519_build_k(ssh_session session)
 {
     ssh_curve25519_pubkey k;
@@ -285,7 +290,7 @@ static SSH_PACKET_CALLBACK(ssh_packet_client_curve25519_reply){
   (void)type;
   (void)user;
 
-  ssh_packet_remove_callbacks(session, &ssh_curve25519_client_callbacks);
+  ssh_client_curve25519_remove_callbacks(session);
 
   pubkey_blob = ssh_buffer_get_ssh_string(packet);
   if (pubkey_blob == NULL) {
@@ -377,12 +382,12 @@ void ssh_server_curve25519_init(ssh_session session){
  */
 static SSH_PACKET_CALLBACK(ssh_packet_server_curve25519_init){
     /* ECDH keys */
-    ssh_string q_c_string;
-    ssh_string q_s_string;
+    ssh_string q_c_string = NULL;
+    ssh_string q_s_string = NULL;
     ssh_string server_pubkey_blob = NULL;
 
     /* SSH host keys (rsa,dsa,ecdsa) */
-    ssh_key privkey;
+    ssh_key privkey = NULL;
     enum ssh_digest_e digest = SSH_DIGEST_AUTO;
     ssh_string sig_blob = NULL;
     int rc;
@@ -402,7 +407,6 @@ static SSH_PACKET_CALLBACK(ssh_packet_server_curve25519_init){
                       SSH_FATAL,
                       "Incorrect size for server Curve25519 public key: %zu",
                       ssh_string_len(q_c_string));
-        SSH_STRING_FREE(q_c_string);
         goto error;
     }
 
@@ -460,12 +464,17 @@ static SSH_PACKET_CALLBACK(ssh_packet_server_curve25519_init){
     /* add ecdh public key */
     q_s_string = ssh_string_new(CURVE25519_PUBKEY_SIZE);
     if (q_s_string == NULL) {
+        ssh_set_error_oom(session);
         goto error;
     }
 
-    ssh_string_fill(q_s_string,
-                    session->next_crypto->curve25519_server_pubkey,
-                    CURVE25519_PUBKEY_SIZE);
+    rc = ssh_string_fill(q_s_string,
+                         session->next_crypto->curve25519_server_pubkey,
+                         CURVE25519_PUBKEY_SIZE);
+    if (rc < 0) {
+        ssh_set_error(session, SSH_FATAL, "Could not copy public key");
+        goto error;
+    }
 
     rc = ssh_buffer_add_ssh_string(session->out_buffer, q_s_string);
     SSH_STRING_FREE(q_s_string);
@@ -508,6 +517,8 @@ static SSH_PACKET_CALLBACK(ssh_packet_server_curve25519_init){
 
     return SSH_PACKET_USED;
 error:
+    SSH_STRING_FREE(q_c_string);
+    SSH_STRING_FREE(q_s_string);
     ssh_buffer_reinit(session->out_buffer);
     session->session_state=SSH_SESSION_STATE_ERROR;
     return SSH_PACKET_USED;

src/dh-gex.c

@@ -238,6 +238,11 @@ error:
     return SSH_PACKET_USED;
 }
 
+void ssh_client_dhgex_remove_callbacks(ssh_session session)
+{
+    ssh_packet_remove_callbacks(session, &ssh_dhgex_client_callbacks);
+}
+
 static SSH_PACKET_CALLBACK(ssh_packet_client_dhgex_reply)
 {
     struct ssh_crypto_struct *crypto=session->next_crypto;
@@ -248,7 +253,7 @@ static SSH_PACKET_CALLBACK(ssh_packet_client_dhgex_reply)
     (void)user;
     SSH_LOG(SSH_LOG_PROTOCOL, "SSH_MSG_KEX_DH_GEX_REPLY received");
 
-    ssh_packet_remove_callbacks(session, &ssh_dhgex_client_callbacks);
+    ssh_client_dhgex_remove_callbacks(session);
     rc = ssh_buffer_unpack(packet,
                            "SBS",
                            &pubkey_blob, &server_pubkey,
@@ -263,6 +268,8 @@ static SSH_PACKET_CALLBACK(ssh_packet_client_dhgex_reply)
         bignum_safe_free(server_pubkey);
         goto error;
     }
+    /* The ownership was passed to the crypto structure */
+    server_pubkey = NULL;
 
     rc = ssh_dh_import_next_pubkey_blob(session, pubkey_blob);
     SSH_STRING_FREE(pubkey_blob);
@@ -293,6 +300,7 @@ static SSH_PACKET_CALLBACK(ssh_packet_client_dhgex_reply)
 
     return SSH_PACKET_USED;
 error:
+    SSH_STRING_FREE(pubkey_blob);
     ssh_dh_cleanup(session->next_crypto);
     session->session_state = SSH_SESSION_STATE_ERROR;
 

src/dh.c

@@ -342,6 +342,11 @@ error:
   return SSH_ERROR;
 }
 
+void ssh_client_dh_remove_callbacks(ssh_session session)
+{
+    ssh_packet_remove_callbacks(session, &ssh_dh_client_callbacks);
+}
+
 SSH_PACKET_CALLBACK(ssh_packet_client_dh_reply){
   struct ssh_crypto_struct *crypto=session->next_crypto;
   ssh_string pubkey_blob = NULL;
@@ -351,7 +356,7 @@ SSH_PACKET_CALLBACK(ssh_packet_client_dh_reply){
   (void)type;
   (void)user;
 
-  ssh_packet_remove_callbacks(session, &ssh_dh_client_callbacks);
+  ssh_client_dh_remove_callbacks(session);
 
   rc = ssh_buffer_unpack(packet, "SBS", &pubkey_blob, &server_pubkey,
           &crypto->dh_server_signature);
@@ -361,6 +366,7 @@ SSH_PACKET_CALLBACK(ssh_packet_client_dh_reply){
   rc = ssh_dh_keypair_set_keys(crypto->dh_ctx, DH_SERVER_KEYPAIR,
                                NULL, server_pubkey);
   if (rc != SSH_OK) {
+      SSH_STRING_FREE(pubkey_blob);
       bignum_safe_free(server_pubkey);
       goto error;
   }

src/ecdh.c

@@ -43,6 +43,11 @@ struct ssh_packet_callbacks_struct ssh_ecdh_client_callbacks = {
     .user = NULL
 };
 
+void ssh_client_ecdh_remove_callbacks(ssh_session session)
+{
+    ssh_packet_remove_callbacks(session, &ssh_ecdh_client_callbacks);
+}
+
 /** @internal
  * @brief parses a SSH_MSG_KEX_ECDH_REPLY packet and sends back
  * a SSH_MSG_NEWKEYS
@@ -55,7 +60,7 @@ SSH_PACKET_CALLBACK(ssh_packet_client_ecdh_reply){
   (void)type;
   (void)user;
 
-  ssh_packet_remove_callbacks(session, &ssh_ecdh_client_callbacks);
+  ssh_client_ecdh_remove_callbacks(session);
   pubkey_blob = ssh_buffer_get_ssh_string(packet);
   if (pubkey_blob == NULL) {
     ssh_set_error(session,SSH_FATAL, "No public key in packet");

src/external/ed25519.c

@@ -77,8 +77,8 @@ static void get_hram(unsigned char *hram,
 }
 
 
-int crypto_sign_ed25519_keypair(unsigned char *pk,
-                                unsigned char *sk)
+int crypto_sign_ed25519_keypair(ed25519_pubkey pk,
+                                ed25519_privkey sk)
 {
     sc25519 scsk;
     ge25519 gepk;
@@ -114,7 +114,7 @@ int crypto_sign_ed25519(unsigned char *sm,
                         uint64_t *smlen,
                         const unsigned char *m,
                         uint64_t mlen,
-                        const unsigned char *sk)
+                        const ed25519_privkey sk)
 {
     sc25519 sck, scs, scsk;
     ge25519 ger;
@@ -177,7 +177,7 @@ int crypto_sign_ed25519_open(unsigned char *m,
                              uint64_t *mlen,
                              const unsigned char *sm,
                              uint64_t smlen,
-                             const unsigned char *pk)
+                             const ed25519_pubkey pk)
 {
     unsigned int i;
     int ret;

src/getpass.c

@@ -255,7 +255,11 @@ int ssh_getpass(const char *prompt,
 
     /* disable nonblocking I/O */
     if (fd & O_NDELAY) {
-        fcntl(0, F_SETFL, fd & ~O_NDELAY);
+        ok = fcntl(0, F_SETFL, fd & ~O_NDELAY);
+        if (ok < 0) {
+            perror("fcntl");
+            return -1;
+        }
     }
 
     ok = ssh_gets(prompt, buf, len, verify);
@@ -267,7 +271,11 @@ int ssh_getpass(const char *prompt,
 
     /* close fd */
     if (fd & O_NDELAY) {
-        fcntl(0, F_SETFL, fd);
+        ok = fcntl(0, F_SETFL, fd);
+        if (ok < 0) {
+            perror("fcntl");
+            return -1;
+        }
     }
 
     if (!ok) {

src/gssapi.c

@@ -223,6 +223,7 @@ int ssh_gssapi_handle_userauth(ssh_session session, const char *user, uint32_t n
                              "indicate mechs",
                              maj_stat,
                              min_stat);
+        gss_release_oid_set(&min_stat, &both_supported);
         return SSH_ERROR;
     }
 
@@ -259,8 +260,10 @@ int ssh_gssapi_handle_userauth(ssh_session session, const char *user, uint32_t n
         return SSH_OK;
     }
     /* from now we have room for context */
-    if (ssh_gssapi_init(session) == SSH_ERROR)
+    if (ssh_gssapi_init(session) == SSH_ERROR) {
+        gss_release_oid_set(&min_stat, &both_supported);
         return SSH_ERROR;
+    }
 
     name_buf.value = service_name;
     name_buf.length = strlen(name_buf.value) + 1;
@@ -272,6 +275,7 @@ int ssh_gssapi_handle_userauth(ssh_session session, const char *user, uint32_t n
                              "importing name",
                              maj_stat,
                              min_stat);
+        gss_release_oid_set(&min_stat, &both_supported);
         return -1;
     }
 
@@ -338,6 +342,7 @@ static char *ssh_gssapi_name_to_char(gss_name_t name){
                          min_stat);
     ptr = malloc(buffer.length + 1);
     if (ptr == NULL) {
+        gss_release_buffer(&min_stat, &buffer);
         return NULL;
     }
     memcpy(ptr, buffer.value, buffer.length);
@@ -421,6 +426,7 @@ SSH_PACKET_CALLBACK(ssh_packet_userauth_gssapi_token_server){
                              "Gssapi error",
                              maj_stat,
                              min_stat);
+        gss_release_buffer(&min_stat, &output_token);
         ssh_auth_reply_default(session,0);
         ssh_gssapi_free(session);
         session->gssapi=NULL;
@@ -438,6 +444,9 @@ SSH_PACKET_CALLBACK(ssh_packet_userauth_gssapi_token_server){
                         (size_t)output_token.length, output_token.value);
         ssh_packet_send(session);
     }
+
+    gss_release_buffer(&min_stat, &output_token);
+
     if(maj_stat == GSS_S_COMPLETE){
         session->gssapi->state = SSH_GSSAPI_STATE_RCV_MIC;
     }
@@ -465,8 +474,8 @@ static ssh_buffer ssh_gssapi_build_mic(ssh_session session)
 
     rc = ssh_buffer_pack(mic_buffer,
                          "dPbsss",
-                         crypto->digest_len,
-                         (size_t)crypto->digest_len, crypto->session_id,
+                         crypto->session_id_len,
+                         crypto->session_id_len, crypto->session_id,
                          SSH2_MSG_USERAUTH_REQUEST,
                          session->gssapi->user,
                          "ssh-connection",
@@ -638,7 +647,7 @@ fail:
 static int ssh_gssapi_match(ssh_session session, gss_OID_set *valid_oids)
 {
     OM_uint32 maj_stat, min_stat, lifetime;
-    gss_OID_set actual_mechs;
+    gss_OID_set actual_mechs = GSS_C_NO_OID_SET;
     gss_buffer_desc namebuf;
     gss_name_t client_id = GSS_C_NO_NAME;
     gss_OID oid;
@@ -700,6 +709,7 @@ static int ssh_gssapi_match(ssh_session session, gss_OID_set *valid_oids)
     ret = SSH_OK;
 
 end:
+    gss_release_oid_set(&min_stat, &actual_mechs);
     gss_release_name(&min_stat, &client_id);
     return ret;
 }
@@ -713,7 +723,7 @@ end:
  */
 int ssh_gssapi_auth_mic(ssh_session session){
     size_t i;
-    gss_OID_set selected; /* oid selected for authentication */
+    gss_OID_set selected = GSS_C_NO_OID_SET; /* oid selected for authentication */
     ssh_string *oids = NULL;
     int rc;
     size_t n_oids = 0;
@@ -790,6 +800,8 @@ out:
         SSH_STRING_FREE(oids[i]);
     }
     free(oids);
+    gss_release_oid_set(&min_stat, &selected);
+
     if (rc != SSH_ERROR) {
         return SSH_AUTH_AGAIN;
     }
@@ -893,6 +905,8 @@ SSH_PACKET_CALLBACK(ssh_packet_userauth_gssapi_response){
         ssh_packet_send(session);
         session->auth.state = SSH_AUTH_STATE_GSSAPI_TOKEN;
     }
+
+    gss_release_buffer(&min_stat, &output_token);
     return SSH_PACKET_USED;
 
 error:
@@ -921,9 +935,11 @@ static int ssh_gssapi_send_mic(ssh_session session){
 
     maj_stat = gss_get_mic(&min_stat,session->gssapi->ctx, GSS_C_QOP_DEFAULT,
                            &mic_buf, &mic_token_buf);
+
+    SSH_BUFFER_FREE(mic_buffer);
+
     if (GSS_ERROR(maj_stat)){
-        SSH_BUFFER_FREE(mic_buffer);
-        ssh_gssapi_log_error(SSH_LOG_PROTOCOL,
+        ssh_gssapi_log_error(SSH_LOG_DEBUG,
                              "generating MIC",
                              maj_stat,
                              min_stat);
@@ -935,8 +951,10 @@ static int ssh_gssapi_send_mic(ssh_session session){
                          SSH2_MSG_USERAUTH_GSSAPI_MIC,
                          mic_token_buf.length,
                          (size_t)mic_token_buf.length, mic_token_buf.value);
+
+    gss_release_buffer(&min_stat, &mic_token_buf);
+
     if (rc != SSH_OK) {
-        SSH_BUFFER_FREE(mic_buffer);
         ssh_set_error_oom(session);
         return SSH_ERROR;
     }
@@ -1005,6 +1023,8 @@ SSH_PACKET_CALLBACK(ssh_packet_userauth_gssapi_token_client){
         ssh_packet_send(session);
     }
 
+    gss_release_buffer(&min_stat, &output_token);
+
     if (maj_stat == GSS_S_COMPLETE) {
         ssh_gssapi_send_mic(session);
         session->auth.state = SSH_AUTH_STATE_GSSAPI_MIC_SENT;

src/init.c

@@ -269,7 +269,7 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL,
  *
  * @see ssh_init()
  */
-bool is_ssh_initialized() {
+bool is_ssh_initialized(void) {
 
     bool is_initialized = false;
 

src/kdf.c

@@ -138,7 +138,7 @@ int sshkdf_derive_key(struct ssh_crypto_struct *crypto,
     ssh_mac_update(ctx, key, key_len);
     ssh_mac_update(ctx, crypto->secret_hash, crypto->digest_len);
     ssh_mac_update(ctx, &letter, 1);
-    ssh_mac_update(ctx, crypto->session_id, crypto->digest_len);
+    ssh_mac_update(ctx, crypto->session_id, crypto->session_id_len);
     ssh_mac_final(digest, ctx);
 
     if (requested_len < output_len) {

src/kex.c

@@ -28,6 +28,7 @@
 #include <stdio.h>
 #include <stdbool.h>
 
+#include "libssh/libssh.h"
 #include "libssh/priv.h"
 #include "libssh/buffer.h"
 #include "libssh/dh.h"
@@ -305,6 +306,10 @@ static int cmp_first_kex_algo(const char *client_str,
 
     int is_wrong = 1;
 
+    if (client_str == NULL || server_str == NULL) {
+        return is_wrong;
+    }
+
     colon = strchr(client_str, ',');
     if (colon == NULL) {
         client_kex_len = strlen(client_str);
@@ -331,6 +336,7 @@ static int cmp_first_kex_algo(const char *client_str,
 SSH_PACKET_CALLBACK(ssh_packet_kexinit)
 {
     int i, ok;
+    struct ssh_crypto_struct *crypto = session->next_crypto;
     int server_kex = session->server;
     ssh_string str = NULL;
     char *strings[SSH_KEX_METHODS] = {0};
@@ -344,35 +350,67 @@ SSH_PACKET_CALLBACK(ssh_packet_kexinit)
     (void)type;
     (void)user;
 
+    SSH_LOG(SSH_LOG_TRACE, "KEXINIT received");
+
     if (session->session_state == SSH_SESSION_STATE_AUTHENTICATED) {
-        SSH_LOG(SSH_LOG_INFO, "Initiating key re-exchange");
+        if (session->dh_handshake_state == DH_STATE_FINISHED) {
+            SSH_LOG(SSH_LOG_DEBUG, "Peer initiated key re-exchange");
+            /* Reset the sent flag if the re-kex was initiated by the peer */
+            session->flags &= ~SSH_SESSION_FLAG_KEXINIT_SENT;
+        } else if (session->flags & SSH_SESSION_FLAG_KEXINIT_SENT &&
+                   session->dh_handshake_state == DH_STATE_INIT_SENT) {
+            /* This happens only when we are sending our-guessed first kex
+             * packet right after our KEXINIT packet. */
+            SSH_LOG(SSH_LOG_DEBUG, "Received peer kexinit answer.");
+        } else if (session->session_state != SSH_SESSION_STATE_INITIAL_KEX) {
+            ssh_set_error(session, SSH_FATAL,
+                          "SSH_KEXINIT received in wrong state");
+            goto error;
+        }
     } else if (session->session_state != SSH_SESSION_STATE_INITIAL_KEX) {
-        ssh_set_error(session,SSH_FATAL,"SSH_KEXINIT received in wrong state");
+        ssh_set_error(session, SSH_FATAL,
+                      "SSH_KEXINIT received in wrong state");
         goto error;
     }
 
     if (server_kex) {
-        len = ssh_buffer_get_data(packet,session->next_crypto->client_kex.cookie, 16);
+#ifdef WITH_SERVER
+        len = ssh_buffer_get_data(packet, crypto->client_kex.cookie, 16);
         if (len != 16) {
-            ssh_set_error(session, SSH_FATAL, "ssh_packet_kexinit: no cookie in packet");
+            ssh_set_error(session, SSH_FATAL,
+                          "ssh_packet_kexinit: no cookie in packet");
             goto error;
         }
 
-        ok = ssh_hashbufin_add_cookie(session, session->next_crypto->client_kex.cookie);
+        ok = ssh_hashbufin_add_cookie(session, crypto->client_kex.cookie);
         if (ok < 0) {
-            ssh_set_error(session, SSH_FATAL, "ssh_packet_kexinit: adding cookie failed");
+            ssh_set_error(session, SSH_FATAL,
+                          "ssh_packet_kexinit: adding cookie failed");
             goto error;
         }
+
+        ok = server_set_kex(session);
+        if (ok == SSH_ERROR) {
+            goto error;
+        }
+#endif
     } else {
-        len = ssh_buffer_get_data(packet,session->next_crypto->server_kex.cookie, 16);
+        len = ssh_buffer_get_data(packet, crypto->server_kex.cookie, 16);
         if (len != 16) {
-            ssh_set_error(session, SSH_FATAL, "ssh_packet_kexinit: no cookie in packet");
+            ssh_set_error(session, SSH_FATAL,
+                          "ssh_packet_kexinit: no cookie in packet");
             goto error;
         }
 
-        ok = ssh_hashbufin_add_cookie(session, session->next_crypto->server_kex.cookie);
+        ok = ssh_hashbufin_add_cookie(session, crypto->server_kex.cookie);
         if (ok < 0) {
-            ssh_set_error(session, SSH_FATAL, "ssh_packet_kexinit: adding cookie failed");
+            ssh_set_error(session, SSH_FATAL,
+                          "ssh_packet_kexinit: adding cookie failed");
+            goto error;
+        }
+
+        ok = ssh_set_client_kex(session);
+        if (ok == SSH_ERROR) {
             goto error;
         }
     }
@@ -385,7 +423,8 @@ SSH_PACKET_CALLBACK(ssh_packet_kexinit)
 
         rc = ssh_buffer_add_ssh_string(session->in_hashbuf, str);
         if (rc < 0) {
-            ssh_set_error(session, SSH_FATAL, "Error adding string in hash buffer");
+            ssh_set_error(session, SSH_FATAL,
+                          "Error adding string in hash buffer");
             goto error;
         }
 
@@ -398,14 +437,14 @@ SSH_PACKET_CALLBACK(ssh_packet_kexinit)
         str = NULL;
     }
 
-    /* copy the server kex info into an array of strings */
+    /* copy the peer kex info into an array of strings */
     if (server_kex) {
         for (i = 0; i < SSH_KEX_METHODS; i++) {
-            session->next_crypto->client_kex.methods[i] = strings[i];
+            crypto->client_kex.methods[i] = strings[i];
         }
     } else { /* client */
         for (i = 0; i < SSH_KEX_METHODS; i++) {
-            session->next_crypto->server_kex.methods[i] = strings[i];
+            crypto->server_kex.methods[i] = strings[i];
         }
     }
 
@@ -419,30 +458,48 @@ SSH_PACKET_CALLBACK(ssh_packet_kexinit)
      * that its value is included when computing the session ID (see
      * 'make_sessionid').
      */
+    rc = ssh_buffer_get_u8(packet, &first_kex_packet_follows);
+    if (rc != 1) {
+        goto error;
+    }
+
+    rc = ssh_buffer_add_u8(session->in_hashbuf, first_kex_packet_follows);
+    if (rc < 0) {
+        goto error;
+    }
+
+    rc = ssh_buffer_add_u32(session->in_hashbuf, kexinit_reserved);
+    if (rc < 0) {
+        goto error;
+    }
+
+    /*
+     * Remember whether 'first_kex_packet_follows' was set and the client
+     * guess was wrong: in this case the next SSH_MSG_KEXDH_INIT message
+     * must be ignored on the server side.
+     * Client needs to start the Key exchange over with the correct method
+     */
+    if (first_kex_packet_follows || session->send_first_kex_follows) {
+        char **client_methods = crypto->client_kex.methods;
+        char **server_methods = crypto->server_kex.methods;
+        session->first_kex_follows_guess_wrong =
+            cmp_first_kex_algo(client_methods[SSH_KEX],
+                               server_methods[SSH_KEX]) ||
+            cmp_first_kex_algo(client_methods[SSH_HOSTKEYS],
+                               server_methods[SSH_HOSTKEYS]);
+            SSH_LOG(SSH_LOG_DEBUG, "The initial guess was %s.",
+                    session->first_kex_follows_guess_wrong ? "wrong" : "right");
+    }
+
     if (server_kex) {
-        rc = ssh_buffer_get_u8(packet, &first_kex_packet_follows);
-        if (rc != 1) {
-            goto error;
-        }
-
-        rc = ssh_buffer_add_u8(session->in_hashbuf, first_kex_packet_follows);
-        if (rc < 0) {
-            goto error;
-        }
-
-        rc = ssh_buffer_add_u32(session->in_hashbuf, kexinit_reserved);
-        if (rc < 0) {
-            goto error;
-        }
-
         /*
          * If client sent a ext-info-c message in the kex list, it supports
          * RFC 8308 extension negotiation.
          */
-        ok = ssh_match_group(session->next_crypto->client_kex.methods[SSH_KEX],
+        ok = ssh_match_group(crypto->client_kex.methods[SSH_KEX],
                              KEX_EXTENSION_CLIENT);
         if (ok) {
-            const char *hostkeys = NULL;
+            const char *hostkeys = NULL, *wanted_hostkeys = NULL;
 
             /* The client supports extension negotiation */
             session->extensions |= SSH_EXT_NEGOTIATION;
@@ -452,14 +509,14 @@ SSH_PACKET_CALLBACK(ssh_packet_kexinit)
              * by the client and enable the respective extensions to provide
              * correct signature in the next packet if RSA is negotiated
              */
-            hostkeys = session->next_crypto->client_kex.methods[SSH_HOSTKEYS];
+            hostkeys = crypto->client_kex.methods[SSH_HOSTKEYS];
+            wanted_hostkeys = session->opts.wanted_methods[SSH_HOSTKEYS];
             ok = ssh_match_group(hostkeys, "rsa-sha2-512");
             if (ok) {
                 /* Check if rsa-sha2-512 is allowed by config */
-                if (session->opts.wanted_methods[SSH_HOSTKEYS] != NULL) {
-                    char *is_allowed =
-                        ssh_find_matching(session->opts.wanted_methods[SSH_HOSTKEYS],
-                                          "rsa-sha2-512");
+                if (wanted_hostkeys != NULL) {
+                    char *is_allowed = ssh_find_matching(wanted_hostkeys,
+                                                         "rsa-sha2-512");
                     if (is_allowed != NULL) {
                         session->extensions |= SSH_EXT_SIG_RSA_SHA512;
                     }
@@ -469,10 +526,9 @@ SSH_PACKET_CALLBACK(ssh_packet_kexinit)
             ok = ssh_match_group(hostkeys, "rsa-sha2-256");
             if (ok) {
                 /* Check if rsa-sha2-256 is allowed by config */
-                if (session->opts.wanted_methods[SSH_HOSTKEYS] != NULL) {
-                    char *is_allowed =
-                        ssh_find_matching(session->opts.wanted_methods[SSH_HOSTKEYS],
-                                          "rsa-sha2-256");
+                if (wanted_hostkeys != NULL) {
+                    char *is_allowed = ssh_find_matching(wanted_hostkeys,
+                                                         "rsa-sha2-256");
                     if (is_allowed != NULL) {
                         session->extensions |= SSH_EXT_SIG_RSA_SHA256;
                     }
@@ -488,7 +544,7 @@ SSH_PACKET_CALLBACK(ssh_packet_kexinit)
                 (session->extensions & SSH_EXT_SIG_RSA_SHA512)) {
                 session->extensions &= ~(SSH_EXT_SIG_RSA_SHA256 | SSH_EXT_SIG_RSA_SHA512);
                 rsa_sig_ext = ssh_find_matching("rsa-sha2-512,rsa-sha2-256",
-                                                session->next_crypto->client_kex.methods[SSH_HOSTKEYS]);
+                                                hostkeys);
                 if (rsa_sig_ext == NULL) {
                     goto error; /* should never happen */
                 } else if (strcmp(rsa_sig_ext, "rsa-sha2-512") == 0) {
@@ -507,24 +563,16 @@ SSH_PACKET_CALLBACK(ssh_packet_kexinit)
                     session->extensions & SSH_EXT_SIG_RSA_SHA256 ? "SHA256" : "",
                     session->extensions & SSH_EXT_SIG_RSA_SHA512 ? " SHA512" : "");
         }
-
-        /*
-         * Remember whether 'first_kex_packet_follows' was set and the client
-         * guess was wrong: in this case the next SSH_MSG_KEXDH_INIT message
-         * must be ignored.
-         */
-        if (first_kex_packet_follows) {
-          session->first_kex_follows_guess_wrong =
-            cmp_first_kex_algo(session->next_crypto->client_kex.methods[SSH_KEX],
-                               session->next_crypto->server_kex.methods[SSH_KEX]) ||
-            cmp_first_kex_algo(session->next_crypto->client_kex.methods[SSH_HOSTKEYS],
-                               session->next_crypto->server_kex.methods[SSH_HOSTKEYS]);
-        }
     }
 
     /* Note, that his overwrites authenticated state in case of rekeying */
     session->session_state = SSH_SESSION_STATE_KEXINIT_RECEIVED;
-    session->dh_handshake_state = DH_STATE_INIT;
+    /* if we already sent our initial key exchange packet, do not reset the
+     * DH state. We will know if we were right with our guess only in
+     * dh_handshake_state() */
+    if (session->send_first_kex_follows == false) {
+        session->dh_handshake_state = DH_STATE_INIT;
+    }
     session->ssh_connection_callback(session);
     return SSH_PACKET_USED;
 
@@ -672,14 +720,18 @@ int ssh_set_client_kex(ssh_session session)
     int i;
     size_t kex_len, len;
 
+    /* Skip if already set, for example for the rekey or when we do the guessing
+     * it could have been already used to make some protocol decisions. */
+    if (client->methods[0] != NULL) {
+        return SSH_OK;
+    }
+
     ok = ssh_get_random(client->cookie, 16, 0);
     if (!ok) {
         ssh_set_error(session, SSH_FATAL, "PRNG error");
         return SSH_ERROR;
     }
 
-    memset(client->methods, 0, SSH_KEX_METHODS * sizeof(char **));
-
     /* Set the list of allowed algorithms in order of preference, if it hadn't
      * been set yet. */
     for (i = 0; i < SSH_KEX_METHODS; i++) {
@@ -735,13 +787,103 @@ int ssh_set_client_kex(ssh_session session)
     return SSH_OK;
 }
 
+static const char *ssh_find_aead_hmac(const char *cipher)
+{
+    if (cipher == NULL) {
+        return NULL;
+    } else if (strcmp(cipher, "chacha20-poly1305@openssh.com") == 0) {
+        return "aead-poly1305";
+    } else if (strcmp(cipher, "aes256-gcm@openssh.com") == 0) {
+        return "aead-gcm";
+    } else if (strcmp(cipher, "aes128-gcm@openssh.com") == 0) {
+        return "aead-gcm";
+    }
+    return NULL;
+}
+
+static enum ssh_key_exchange_e
+kex_select_kex_type(const char *kex)
+{
+    if (strcmp(kex, "diffie-hellman-group1-sha1") == 0) {
+        return SSH_KEX_DH_GROUP1_SHA1;
+    } else if (strcmp(kex, "diffie-hellman-group14-sha1") == 0) {
+        return SSH_KEX_DH_GROUP14_SHA1;
+    } else if (strcmp(kex, "diffie-hellman-group14-sha256") == 0) {
+        return SSH_KEX_DH_GROUP14_SHA256;
+    } else if (strcmp(kex, "diffie-hellman-group16-sha512") == 0) {
+        return SSH_KEX_DH_GROUP16_SHA512;
+    } else if (strcmp(kex, "diffie-hellman-group18-sha512") == 0) {
+        return SSH_KEX_DH_GROUP18_SHA512;
+#ifdef WITH_GEX
+    } else if (strcmp(kex, "diffie-hellman-group-exchange-sha1") == 0) {
+        return SSH_KEX_DH_GEX_SHA1;
+    } else if (strcmp(kex, "diffie-hellman-group-exchange-sha256") == 0) {
+        return SSH_KEX_DH_GEX_SHA256;
+#endif /* WITH_GEX */
+    } else if (strcmp(kex, "ecdh-sha2-nistp256") == 0) {
+        return SSH_KEX_ECDH_SHA2_NISTP256;
+    } else if (strcmp(kex, "ecdh-sha2-nistp384") == 0) {
+        return SSH_KEX_ECDH_SHA2_NISTP384;
+    } else if (strcmp(kex, "ecdh-sha2-nistp521") == 0) {
+        return SSH_KEX_ECDH_SHA2_NISTP521;
+    } else if (strcmp(kex, "curve25519-sha256@libssh.org") == 0) {
+        return SSH_KEX_CURVE25519_SHA256_LIBSSH_ORG;
+    } else if (strcmp(kex, "curve25519-sha256") == 0) {
+        return SSH_KEX_CURVE25519_SHA256;
+    }
+    /* should not happen. We should be getting only valid names at this stage */
+    return 0;
+}
+
+
+/** @internal
+ * @brief Reverts guessed callbacks set during the dh_handshake()
+ * @param session session handle
+ * @returns void
+ */
+static void revert_kex_callbacks(ssh_session session)
+{
+    switch (session->next_crypto->kex_type) {
+    case SSH_KEX_DH_GROUP1_SHA1:
+    case SSH_KEX_DH_GROUP14_SHA1:
+    case SSH_KEX_DH_GROUP14_SHA256:
+    case SSH_KEX_DH_GROUP16_SHA512:
+    case SSH_KEX_DH_GROUP18_SHA512:
+        ssh_client_dh_remove_callbacks(session);
+        break;
+#ifdef WITH_GEX
+    case SSH_KEX_DH_GEX_SHA1:
+    case SSH_KEX_DH_GEX_SHA256:
+        ssh_client_dhgex_remove_callbacks(session);
+        break;
+#endif /* WITH_GEX */
+#ifdef HAVE_ECDH
+    case SSH_KEX_ECDH_SHA2_NISTP256:
+    case SSH_KEX_ECDH_SHA2_NISTP384:
+    case SSH_KEX_ECDH_SHA2_NISTP521:
+        ssh_client_ecdh_remove_callbacks(session);
+        break;
+#endif
+#ifdef HAVE_CURVE25519
+    case SSH_KEX_CURVE25519_SHA256:
+    case SSH_KEX_CURVE25519_SHA256_LIBSSH_ORG:
+        ssh_client_curve25519_remove_callbacks(session);
+        break;
+#endif
+    }
+}
+
 /** @brief Select the different methods on basis of client's and
  * server's kex messages, and watches out if a match is possible.
  */
-int ssh_kex_select_methods (ssh_session session){
-    struct ssh_kex_struct *server = &session->next_crypto->server_kex;
-    struct ssh_kex_struct *client = &session->next_crypto->client_kex;
+int ssh_kex_select_methods (ssh_session session)
+{
+    struct ssh_crypto_struct *crypto = session->next_crypto;
+    struct ssh_kex_struct *server = &crypto->server_kex;
+    struct ssh_kex_struct *client = &crypto->client_kex;
     char *ext_start = NULL;
+    const char *aead_hmac = NULL;
+    enum ssh_key_exchange_e kex_type;
     int i;
 
     /* Here we should drop the  ext-info-c  from the list so we avoid matching.
@@ -752,43 +894,40 @@ int ssh_kex_select_methods (ssh_session session){
     }
 
     for (i = 0; i < SSH_KEX_METHODS; i++) {
-        session->next_crypto->kex_methods[i]=ssh_find_matching(server->methods[i],client->methods[i]);
-        if(session->next_crypto->kex_methods[i] == NULL && i < SSH_LANG_C_S){
-            ssh_set_error(session,SSH_FATAL,"kex error : no match for method %s: server [%s], client [%s]",
-                    ssh_kex_descriptions[i],server->methods[i],client->methods[i]);
+        crypto->kex_methods[i] = ssh_find_matching(server->methods[i],
+                                                   client->methods[i]);
+
+        if (i == SSH_MAC_C_S || i == SSH_MAC_S_C) {
+            aead_hmac = ssh_find_aead_hmac(crypto->kex_methods[i - 2]);
+            if (aead_hmac) {
+                free(crypto->kex_methods[i]);
+                crypto->kex_methods[i] = strdup(aead_hmac);
+            }
+        }
+        if (crypto->kex_methods[i] == NULL && i < SSH_LANG_C_S) {
+            ssh_set_error(session, SSH_FATAL,
+                          "kex error : no match for method %s: server [%s], "
+                          "client [%s]", ssh_kex_descriptions[i],
+                          server->methods[i], client->methods[i]);
             return SSH_ERROR;
-        } else if ((i >= SSH_LANG_C_S) && (session->next_crypto->kex_methods[i] == NULL)) {
+        } else if ((i >= SSH_LANG_C_S) && (crypto->kex_methods[i] == NULL)) {
             /* we can safely do that for languages */
-            session->next_crypto->kex_methods[i] = strdup("");
+            crypto->kex_methods[i] = strdup("");
         }
     }
-    if(strcmp(session->next_crypto->kex_methods[SSH_KEX], "diffie-hellman-group1-sha1") == 0){
-      session->next_crypto->kex_type=SSH_KEX_DH_GROUP1_SHA1;
-    } else if(strcmp(session->next_crypto->kex_methods[SSH_KEX], "diffie-hellman-group14-sha1") == 0){
-      session->next_crypto->kex_type=SSH_KEX_DH_GROUP14_SHA1;
-    } else if(strcmp(session->next_crypto->kex_methods[SSH_KEX], "diffie-hellman-group14-sha256") == 0){
-      session->next_crypto->kex_type=SSH_KEX_DH_GROUP14_SHA256;
-    } else if(strcmp(session->next_crypto->kex_methods[SSH_KEX], "diffie-hellman-group16-sha512") == 0){
-      session->next_crypto->kex_type=SSH_KEX_DH_GROUP16_SHA512;
-    } else if(strcmp(session->next_crypto->kex_methods[SSH_KEX], "diffie-hellman-group18-sha512") == 0){
-      session->next_crypto->kex_type=SSH_KEX_DH_GROUP18_SHA512;
-#ifdef WITH_GEX
-    } else if(strcmp(session->next_crypto->kex_methods[SSH_KEX], "diffie-hellman-group-exchange-sha1") == 0){
-      session->next_crypto->kex_type=SSH_KEX_DH_GEX_SHA1;
-    } else if(strcmp(session->next_crypto->kex_methods[SSH_KEX], "diffie-hellman-group-exchange-sha256") == 0){
-        session->next_crypto->kex_type=SSH_KEX_DH_GEX_SHA256;
-#endif /* WITH_GEX */
-    } else if(strcmp(session->next_crypto->kex_methods[SSH_KEX], "ecdh-sha2-nistp256") == 0){
-      session->next_crypto->kex_type=SSH_KEX_ECDH_SHA2_NISTP256;
-    } else if(strcmp(session->next_crypto->kex_methods[SSH_KEX], "ecdh-sha2-nistp384") == 0){
-      session->next_crypto->kex_type=SSH_KEX_ECDH_SHA2_NISTP384;
-    } else if(strcmp(session->next_crypto->kex_methods[SSH_KEX], "ecdh-sha2-nistp521") == 0){
-      session->next_crypto->kex_type=SSH_KEX_ECDH_SHA2_NISTP521;
-    } else if(strcmp(session->next_crypto->kex_methods[SSH_KEX], "curve25519-sha256@libssh.org") == 0){
-      session->next_crypto->kex_type=SSH_KEX_CURVE25519_SHA256_LIBSSH_ORG;
-    } else if(strcmp(session->next_crypto->kex_methods[SSH_KEX], "curve25519-sha256") == 0){
-      session->next_crypto->kex_type=SSH_KEX_CURVE25519_SHA256;
+
+    /* We can not set this value directly as the old value is needed to revert
+     * callbacks if we are client */
+    kex_type = kex_select_kex_type(crypto->kex_methods[SSH_KEX]);
+    if (session->client && session->first_kex_follows_guess_wrong) {
+        SSH_LOG(SSH_LOG_DEBUG, "Our guess was wrong. Restarting the KEX");
+        /* We need to remove the wrong callbacks and start kex again */
+        revert_kex_callbacks(session);
+        session->dh_handshake_state = DH_STATE_INIT;
+        session->first_kex_follows_guess_wrong = false;
     }
+    crypto->kex_type = kex_type;
+
     SSH_LOG(SSH_LOG_INFO, "Negotiated %s,%s,%s,%s,%s,%s,%s,%s,%s,%s",
             session->next_crypto->kex_methods[SSH_KEX],
             session->next_crypto->kex_methods[SSH_HOSTKEYS],
@@ -806,62 +945,116 @@ int ssh_kex_select_methods (ssh_session session){
 
 
 /* this function only sends the predefined set of kex methods */
-int ssh_send_kex(ssh_session session, int server_kex) {
-  struct ssh_kex_struct *kex = (server_kex ? &session->next_crypto->server_kex :
-      &session->next_crypto->client_kex);
-  ssh_string str = NULL;
-  int i;
-  int rc;
+int ssh_send_kex(ssh_session session)
+{
+    struct ssh_kex_struct *kex = (session->server ?
+        &session->next_crypto->server_kex :
+        &session->next_crypto->client_kex);
+    ssh_string str = NULL;
+    int i;
+    int rc;
+    int first_kex_packet_follows = 0;
 
-  rc = ssh_buffer_pack(session->out_buffer,
-                       "bP",
-                       SSH2_MSG_KEXINIT,
-                       16,
-                       kex->cookie); /* cookie */
-  if (rc != SSH_OK)
-    goto error;
-  if (ssh_hashbufout_add_cookie(session) < 0) {
-    goto error;
-  }
-
-  ssh_list_kex(kex);
-
-  for (i = 0; i < SSH_KEX_METHODS; i++) {
-    str = ssh_string_from_char(kex->methods[i]);
-    if (str == NULL) {
-      goto error;
+    /* Only client can initiate the handshake methods we implement. If we
+     * already received the peer mechanisms, there is no point in guessing */
+    if (session->client &&
+        session->session_state != SSH_SESSION_STATE_KEXINIT_RECEIVED &&
+        session->send_first_kex_follows) {
+        first_kex_packet_follows = 1;
     }
 
-    if (ssh_buffer_add_ssh_string(session->out_hashbuf, str) < 0) {
-      goto error;
+    SSH_LOG(SSH_LOG_TRACE,
+            "Sending KEXINIT packet, first_kex_packet_follows = %d",
+            first_kex_packet_follows);
+
+    rc = ssh_buffer_pack(session->out_buffer,
+                         "bP",
+                         SSH2_MSG_KEXINIT,
+                         16,
+                         kex->cookie); /* cookie */
+    if (rc != SSH_OK)
+        goto error;
+    if (ssh_hashbufout_add_cookie(session) < 0) {
+        goto error;
     }
-    if (ssh_buffer_add_ssh_string(session->out_buffer, str) < 0) {
-      goto error;
+
+    ssh_list_kex(kex);
+
+    for (i = 0; i < SSH_KEX_METHODS; i++) {
+        str = ssh_string_from_char(kex->methods[i]);
+        if (str == NULL) {
+            goto error;
+        }
+
+        rc = ssh_buffer_add_ssh_string(session->out_hashbuf, str);
+        if (rc < 0) {
+            goto error;
+        }
+        rc = ssh_buffer_add_ssh_string(session->out_buffer, str);
+        if (rc < 0) {
+            goto error;
+        }
+        SSH_STRING_FREE(str);
+        str = NULL;
     }
-    SSH_STRING_FREE(str);
-    str = NULL;
-  }
 
-  rc = ssh_buffer_pack(session->out_buffer,
-                       "bd",
-                       0,
-                       0);
-  if (rc != SSH_OK) {
-    goto error;
-  }
+    rc = ssh_buffer_pack(session->out_buffer,
+                         "bd",
+                         first_kex_packet_follows,
+                         0);
+    if (rc != SSH_OK) {
+        goto error;
+    }
 
-  if (ssh_packet_send(session) == SSH_ERROR) {
-    return -1;
-  }
+    /* Prepare also the first_kex_packet_follows and reserved to 0 */
+    rc = ssh_buffer_add_u8(session->out_hashbuf, first_kex_packet_follows);
+    if (rc < 0) {
+        goto error;
+    }
+    rc = ssh_buffer_add_u32(session->out_hashbuf, 0);
+    if (rc < 0) {
+        goto error;
+    }
+
+    rc = ssh_packet_send(session);
+    if (rc == SSH_ERROR) {
+        return -1;
+    }
+
+    session->flags |= SSH_SESSION_FLAG_KEXINIT_SENT;
+    SSH_LOG(SSH_LOG_PACKET, "SSH_MSG_KEXINIT sent");
+
+    /* If we indicated that we are sending the guessed key exchange packet,
+     * do it now. The packet is simple, but we need to do some preparations */
+    if (first_kex_packet_follows) {
+        char *list = kex->methods[SSH_KEX];
+        char *colon = strchr(list, ',');
+        size_t kex_name_len = colon ? (size_t)(colon - list) : strlen(list);
+        char *kex_name = calloc(kex_name_len + 1, 1);
+        if (kex_name == NULL) {
+            ssh_set_error_oom(session);
+            goto error;
+        }
+        snprintf(kex_name, kex_name_len + 1, "%.*s", (int)kex_name_len, list);
+        SSH_LOG(SSH_LOG_TRACE, "Sending the first kex packet for %s", kex_name);
+
+        session->next_crypto->kex_type = kex_select_kex_type(kex_name);
+        free(kex_name);
+
+        /* run the first step of the DH handshake */
+        session->dh_handshake_state = DH_STATE_INIT;
+        if (dh_handshake(session) == SSH_ERROR) {
+            goto error;
+        }
+    }
+    return 0;
 
-  SSH_LOG(SSH_LOG_PACKET, "SSH_MSG_KEXINIT sent");
-  return 0;
 error:
-  ssh_buffer_reinit(session->out_buffer);
-  ssh_buffer_reinit(session->out_hashbuf);
-  SSH_STRING_FREE(str);
+    ssh_buffer_reinit(session->out_buffer);
+    ssh_buffer_reinit(session->out_hashbuf);
+    SSH_STRING_FREE(str);
 
-  return -1;
+    return -1;
 }
 
 /*
@@ -904,7 +1097,7 @@ int ssh_send_rekex(ssh_session session)
     }
 
     session->dh_handshake_state = DH_STATE_INIT;
-    rc = ssh_send_kex(session, session->server);
+    rc = ssh_send_kex(session);
     if (rc < 0) {
         SSH_LOG(SSH_LOG_PACKET, "Failed to send kex");
         return rc;
@@ -981,33 +1174,6 @@ int ssh_make_sessionid(ssh_session session)
         client_hash = session->in_hashbuf;
     }
 
-    /*
-     * Handle the two final fields for the KEXINIT message (RFC 4253 7.1):
-     *
-     *      boolean      first_kex_packet_follows
-     *      uint32       0 (reserved for future extension)
-     */
-    rc = ssh_buffer_add_u8(server_hash, 0);
-    if (rc < 0) {
-        goto error;
-    }
-    rc = ssh_buffer_add_u32(server_hash, 0);
-    if (rc < 0) {
-        goto error;
-    }
-
-    /* These fields are handled for the server case in ssh_packet_kexinit. */
-    if (session->client) {
-        rc = ssh_buffer_add_u8(client_hash, 0);
-        if (rc < 0) {
-            goto error;
-        }
-        rc = ssh_buffer_add_u32(client_hash, 0);
-        if (rc < 0) {
-            goto error;
-        }
-    }
-
     rc = ssh_dh_get_next_server_publickey_blob(session, &server_pubkey_blob);
     if (rc != SSH_OK) {
         goto error;
@@ -1023,7 +1189,7 @@ int ssh_make_sessionid(ssh_session session)
                          ssh_buffer_get(server_hash),
                          server_pubkey_blob);
     SSH_STRING_FREE(server_pubkey_blob);
-    if(rc != SSH_OK){
+    if (rc != SSH_OK){
         goto error;
     }
 
@@ -1197,11 +1363,13 @@ int ssh_make_sessionid(ssh_session session)
         }
         memcpy(session->next_crypto->session_id, session->next_crypto->secret_hash,
                 session->next_crypto->digest_len);
+	/* Initial length is the same as secret hash */
+	session->next_crypto->session_id_len = session->next_crypto->digest_len;
     }
 #ifdef DEBUG_CRYPTO
     printf("Session hash: \n");
     ssh_log_hexdump("secret hash", session->next_crypto->secret_hash, session->next_crypto->digest_len);
-    ssh_log_hexdump("session id", session->next_crypto->session_id, session->next_crypto->digest_len);
+    ssh_log_hexdump("session id", session->next_crypto->session_id, session->next_crypto->session_id_len);
 #endif
 
     rc = SSH_OK;

src/knownhosts.c

@@ -372,6 +372,7 @@ struct ssh_list *ssh_known_hosts_get_algorithms(ssh_session session)
 
     list = ssh_list_new();
     if (list == NULL) {
+        ssh_set_error_oom(session);
         SAFE_FREE(host_port);
         return NULL;
     }

src/libcrypto.c

@@ -392,7 +392,7 @@ int ssh_kdf(struct ssh_crypto_struct *crypto,
         goto out;
     }
     rc = EVP_KDF_ctrl(ctx, EVP_KDF_CTRL_SET_SSHKDF_SESSION_ID,
-                      crypto->session_id, crypto->digest_len);
+                      crypto->session_id, crypto->session_id_len);
     if (rc != 1) {
         goto out;
     }

src/libmbedcrypto.c

@@ -687,7 +687,7 @@ static void cipher_encrypt(struct ssh_cipher_struct *cipher,
 }
 
 static void cipher_encrypt_cbc(struct ssh_cipher_struct *cipher, void *in, void *out,
-        unsigned long len)
+        size_t len)
 {
     size_t outlen = 0;
     int rc = 0;
@@ -745,7 +745,7 @@ static void cipher_decrypt(struct ssh_cipher_struct *cipher,
 }
 
 static void cipher_decrypt_cbc(struct ssh_cipher_struct *cipher, void *in, void *out,
-        unsigned long len)
+        size_t len)
 {
     size_t outlen = 0;
     int rc = 0;

src/messages.c

@@ -513,24 +513,30 @@ static int ssh_message_termination(void *s){
  * @warning This function blocks until a message has been received. Betterset up
  *          a callback if this behavior is unwanted.
  */
-ssh_message ssh_message_get(ssh_session session) {
-  ssh_message msg = NULL;
-  int rc;
+ssh_message ssh_message_get(ssh_session session)
+{
+    ssh_message msg = NULL;
+    int rc;
 
-  msg=ssh_message_pop_head(session);
-  if(msg) {
-      return msg;
-  }
-  if(session->ssh_message_list == NULL) {
-      session->ssh_message_list = ssh_list_new();
-  }
-  rc = ssh_handle_packets_termination(session, SSH_TIMEOUT_USER,
-      ssh_message_termination, session);
-  if(rc || session->session_state == SSH_SESSION_STATE_ERROR)
-    return NULL;
-  msg=ssh_list_pop_head(ssh_message, session->ssh_message_list);
+    msg = ssh_message_pop_head(session);
+    if (msg != NULL) {
+        return msg;
+    }
+    if (session->ssh_message_list == NULL) {
+        session->ssh_message_list = ssh_list_new();
+        if (session->ssh_message_list == NULL) {
+            ssh_set_error_oom(session);
+            return NULL;
+        }
+    }
+    rc = ssh_handle_packets_termination(session, SSH_TIMEOUT_USER,
+                                        ssh_message_termination, session);
+    if (rc || session->session_state == SSH_SESSION_STATE_ERROR) {
+        return NULL;
+    }
+    msg = ssh_list_pop_head(ssh_message, session->ssh_message_list);
 
-  return msg;
+    return msg;
 }
 
 /**
@@ -708,8 +714,8 @@ static ssh_buffer ssh_msg_userauth_build_digest(ssh_session session,
 
     rc = ssh_buffer_pack(buffer,
                          "dPbsssbsS",
-                         crypto->digest_len, /* session ID string */
-                         (size_t)crypto->digest_len, crypto->session_id,
+                         crypto->session_id_len, /* session ID string */
+                         crypto->session_id_len, crypto->session_id,
                          SSH2_MSG_USERAUTH_REQUEST, /* type */
                          msg->auth_request.username,
                          service,

src/misc.c

@@ -1164,14 +1164,13 @@ char *ssh_path_expand_escape(ssh_session session, const char *s) {
                 x = strdup(session->opts.username);
                 break;
             case 'p':
-                if (session->opts.port < 65536) {
-                    char tmp[6];
+                {
+                  char tmp[6];
 
-                    snprintf(tmp,
-                             sizeof(tmp),
-                             "%u",
-                             session->opts.port > 0 ? session->opts.port : 22);
-                    x = strdup(tmp);
+                  snprintf(tmp, sizeof(tmp), "%hu",
+                           (uint16_t)(session->opts.port > 0 ? session->opts.port
+                                                             : 22));
+                  x = strdup(tmp);
                 }
                 break;
             default:

src/packet.c

@@ -366,6 +366,11 @@ static enum ssh_packet_filter_result_e ssh_packet_incoming_filter(ssh_session se
          * - session->dh_handhsake_state = DH_STATE_NEWKEYS_SENT
          * */
 
+        if (!session->server) {
+            rc = SSH_PACKET_DENIED;
+            break;
+        }
+
         if (session->session_state != SSH_SESSION_STATE_DH) {
             rc = SSH_PACKET_DENIED;
             break;
@@ -688,10 +693,12 @@ static enum ssh_packet_filter_result_e ssh_packet_incoming_filter(ssh_session se
         /*
          * States required:
          * - session_state == SSH_SESSION_STATE_AUTHENTICATED
-         * - session->global_req_state == SSH_CHANNEL_REQ_STATE_PENDING
          *
          * Transitions:
-         * - session->global_req_state == SSH_CHANNEL_REQ_STATE_ACCEPTED
+         * - From channel->request_state == SSH_CHANNEL_REQ_STATE_PENDING
+         * - To   channel->request_state = SSH_CHANNEL_REQ_STATE_ACCEPTED
+         *
+         * If not in a pending state, message is ignored in the callback handler.
          * */
 
         if (session->session_state != SSH_SESSION_STATE_AUTHENTICATED) {
@@ -699,21 +706,18 @@ static enum ssh_packet_filter_result_e ssh_packet_incoming_filter(ssh_session se
             break;
         }
 
-        if (session->global_req_state != SSH_CHANNEL_REQ_STATE_PENDING) {
-            rc = SSH_PACKET_DENIED;
-            break;
-        }
-
         rc = SSH_PACKET_ALLOWED;
         break;
     case SSH2_MSG_REQUEST_FAILURE:                    // 82
         /*
          * States required:
          * - session_state == SSH_SESSION_STATE_AUTHENTICATED
-         * - session->global_req_state == SSH_CHANNEL_REQ_STATE_PENDING
          *
          * Transitions:
-         * - session->global_req_state == SSH_CHANNEL_REQ_STATE_DENIED
+         * - From channel->request_state == SSH_CHANNEL_REQ_STATE_PENDING
+         * - To   channel->request_state = SSH_CHANNEL_REQ_STATE_ACCEPTED
+         *
+         * If not in a pending state, message is ignored in the callback handler.
          * */
 
         if (session->session_state != SSH_SESSION_STATE_AUTHENTICATED) {
@@ -721,11 +725,6 @@ static enum ssh_packet_filter_result_e ssh_packet_incoming_filter(ssh_session se
             break;
         }
 
-        if (session->global_req_state != SSH_CHANNEL_REQ_STATE_PENDING) {
-            rc = SSH_PACKET_DENIED;
-            break;
-        }
-
         rc = SSH_PACKET_ALLOWED;
         break;
     case SSH2_MSG_CHANNEL_OPEN:                       // 90
@@ -878,10 +877,12 @@ static enum ssh_packet_filter_result_e ssh_packet_incoming_filter(ssh_session se
         /*
          * States required:
          * - session_state == SSH_SESSION_STATE_AUTHENTICATED
-         * - channel->request_state == SSH_CHANNEL_REQ_STATE_PENDING
          *
          * Transitions:
-         * - channel->request_state = SSH_CHANNEL_REQ_STATE_ACCEPTED
+         * - From channel->request_state == SSH_CHANNEL_REQ_STATE_PENDING
+         * - To   channel->request_state = SSH_CHANNEL_REQ_STATE_ACCEPTED
+         *
+         * If not in a pending state, message is ignored in the callback handler.
          * */
 
         if (session->session_state != SSH_SESSION_STATE_AUTHENTICATED) {
@@ -895,10 +896,12 @@ static enum ssh_packet_filter_result_e ssh_packet_incoming_filter(ssh_session se
         /*
          * States required:
          * - session_state == SSH_SESSION_STATE_AUTHENTICATED
-         * - channel->request_state == SSH_CHANNEL_REQ_STATE_PENDING
          *
          * Transitions:
-         * - channel->request_state = SSH_CHANNEL_REQ_STATE_DENIED
+         * - From channel->request_state == SSH_CHANNEL_REQ_STATE_PENDING
+         * - To   channel->request_state = SSH_CHANNEL_REQ_STATE_ACCEPTED
+         *
+         * If not in a pending state, message is ignored in the callback handler.
          * */
 
         if (session->session_state != SSH_SESSION_STATE_AUTHENTICATED) {
@@ -1412,31 +1415,41 @@ static void ssh_packet_socket_controlflow_callback(int code, void *userdata)
     }
 }
 
-void ssh_packet_register_socket_callback(ssh_session session, ssh_socket s){
-	session->socket_callbacks.data=ssh_packet_socket_callback;
-	session->socket_callbacks.connected=NULL;
-    session->socket_callbacks.controlflow = ssh_packet_socket_controlflow_callback;
-	session->socket_callbacks.userdata=session;
-	ssh_socket_set_callbacks(s,&session->socket_callbacks);
+void ssh_packet_register_socket_callback(ssh_session session, ssh_socket s)
+{
+    struct ssh_socket_callbacks_struct *callbacks = &session->socket_callbacks;
+
+    callbacks->data = ssh_packet_socket_callback;
+    callbacks->connected = NULL;
+    callbacks->controlflow = ssh_packet_socket_controlflow_callback;
+    callbacks->userdata = session;
+    ssh_socket_set_callbacks(s, callbacks);
 }
 
 /** @internal
  * @brief sets the callbacks for the packet layer
  */
-void ssh_packet_set_callbacks(ssh_session session, ssh_packet_callbacks callbacks){
-  if(session->packet_callbacks == NULL){
-    session->packet_callbacks = ssh_list_new();
-  }
-  if (session->packet_callbacks != NULL) {
+void
+ssh_packet_set_callbacks(ssh_session session, ssh_packet_callbacks callbacks)
+{
+    if (session->packet_callbacks == NULL) {
+        session->packet_callbacks = ssh_list_new();
+        if (session->packet_callbacks == NULL) {
+            ssh_set_error_oom(session);
+            return;
+        }
+    }
     ssh_list_append(session->packet_callbacks, callbacks);
-  }
 }
 
 /** @internal
  * @brief remove the callbacks from the packet layer
  */
-void ssh_packet_remove_callbacks(ssh_session session, ssh_packet_callbacks callbacks){
+void
+ssh_packet_remove_callbacks(ssh_session session, ssh_packet_callbacks callbacks)
+{
     struct ssh_iterator *it = NULL;
+
     it = ssh_list_find(session->packet_callbacks, callbacks);
     if (it != NULL) {
         ssh_list_remove(session->packet_callbacks, it);
@@ -1446,12 +1459,15 @@ void ssh_packet_remove_callbacks(ssh_session session, ssh_packet_callbacks callb
 /** @internal
  * @brief sets the default packet handlers
  */
-void ssh_packet_set_default_callbacks(ssh_session session){
-	session->default_packet_callbacks.start=1;
-	session->default_packet_callbacks.n_callbacks=sizeof(default_packet_handlers)/sizeof(ssh_packet_callback);
-	session->default_packet_callbacks.user=session;
-	session->default_packet_callbacks.callbacks=default_packet_handlers;
-	ssh_packet_set_callbacks(session, &session->default_packet_callbacks);
+void ssh_packet_set_default_callbacks(ssh_session session)
+{
+    struct ssh_packet_callbacks_struct *c = &session->default_packet_callbacks;
+
+    c->start = 1;
+    c->n_callbacks = sizeof(default_packet_handlers) / sizeof(ssh_packet_callback);
+    c->user = session;
+    c->callbacks = default_packet_handlers;
+    ssh_packet_set_callbacks(session, c);
 }
 
 /** @internal
@@ -1899,7 +1915,7 @@ ssh_packet_set_newkeys(ssh_session session,
 
     /* Both sides switched: do the actual switch now */
     if (session->next_crypto->used == SSH_DIRECTION_BOTH) {
-        size_t digest_len;
+        size_t session_id_len;
 
         if (session->current_crypto != NULL) {
             crypto_free(session->current_crypto);
@@ -1916,8 +1932,8 @@ ssh_packet_set_newkeys(ssh_session session,
             return SSH_ERROR;
         }
 
-        digest_len = session->current_crypto->digest_len;
-        session->next_crypto->session_id = malloc(digest_len);
+        session_id_len = session->current_crypto->session_id_len;
+        session->next_crypto->session_id = malloc(session_id_len);
         if (session->next_crypto->session_id == NULL) {
             ssh_set_error_oom(session);
             return SSH_ERROR;
@@ -1925,7 +1941,8 @@ ssh_packet_set_newkeys(ssh_session session,
 
         memcpy(session->next_crypto->session_id,
                session->current_crypto->session_id,
-               digest_len);
+               session_id_len);
+        session->next_crypto->session_id_len = session_id_len;
 
         return SSH_OK;
     }

src/packet_cb.c

@@ -129,6 +129,8 @@ SSH_PACKET_CALLBACK(ssh_packet_newkeys){
     }
 
     rc = ssh_pki_import_signature_blob(sig_blob, server_key, &sig);
+    ssh_string_burn(sig_blob);
+    SSH_STRING_FREE(sig_blob);
     if (rc != SSH_OK) {
         goto error;
     }
@@ -152,10 +154,11 @@ SSH_PACKET_CALLBACK(ssh_packet_newkeys){
                                   server_key,
                                   session->next_crypto->secret_hash,
                                   session->next_crypto->digest_len);
-    ssh_string_burn(sig_blob);
-    SSH_STRING_FREE(sig_blob);
-    ssh_signature_free(sig);
+    SSH_SIGNATURE_FREE(sig);
     if (rc == SSH_ERROR) {
+      ssh_set_error(session,
+                    SSH_FATAL,
+                    "Failed to verify server hostkey signature");
       goto error;
     }
     SSH_LOG(SSH_LOG_PROTOCOL,"Signature verified and valid");
@@ -170,6 +173,9 @@ SSH_PACKET_CALLBACK(ssh_packet_newkeys){
   session->ssh_connection_callback(session);
   return SSH_PACKET_USED;
 error:
+  SSH_SIGNATURE_FREE(sig);
+  ssh_string_burn(sig_blob);
+  SSH_STRING_FREE(sig_blob);
   session->session_state = SSH_SESSION_STATE_ERROR;
   return SSH_PACKET_USED;
 }

src/pki.c

@@ -1160,6 +1160,10 @@ int pki_import_privkey_buffer(enum ssh_keytypes_e type,
                 nid = pki_key_ecdsa_nid_from_name(ssh_string_get_char(i));
                 SSH_STRING_FREE(i);
                 if (nid == -1) {
+                    ssh_string_burn(e);
+                    SSH_STRING_FREE(e);
+                    ssh_string_burn(exp);
+                    SSH_STRING_FREE(exp);
                     goto fail;
                 }
 
@@ -2086,8 +2090,12 @@ int ssh_pki_export_signature_blob(const ssh_signature sig,
         return SSH_ERROR;
     }
 
-    ssh_string_fill(str, ssh_buffer_get(buf), ssh_buffer_get_len(buf));
+    rc = ssh_string_fill(str, ssh_buffer_get(buf), ssh_buffer_get_len(buf));
     SSH_BUFFER_FREE(buf);
+    if (rc < 0) {
+        SSH_STRING_FREE(str);
+        return SSH_ERROR;
+    }
 
     *sig_blob = str;
 
@@ -2328,11 +2336,14 @@ ssh_string ssh_pki_do_sign(ssh_session session,
     }
 
     /* Get the session ID */
-    session_id = ssh_string_new(crypto->digest_len);
+    session_id = ssh_string_new(crypto->session_id_len);
     if (session_id == NULL) {
         return NULL;
     }
-    ssh_string_fill(session_id, crypto->session_id, crypto->digest_len);
+    rc = ssh_string_fill(session_id, crypto->session_id, crypto->session_id_len);
+    if (rc < 0) {
+        goto end;
+    }
 
     /* Fill the input */
     sign_input = ssh_buffer_new();
@@ -2389,11 +2400,15 @@ ssh_string ssh_pki_do_sign_agent(ssh_session session,
     }
 
     /* prepend session identifier */
-    session_id = ssh_string_new(crypto->digest_len);
+    session_id = ssh_string_new(crypto->session_id_len);
     if (session_id == NULL) {
         return NULL;
     }
-    ssh_string_fill(session_id, crypto->session_id, crypto->digest_len);
+    rc = ssh_string_fill(session_id, crypto->session_id, crypto->session_id_len);
+    if (rc < 0) {
+        SSH_STRING_FREE(session_id);
+        return NULL;
+    }
 
     sig_buf = ssh_buffer_new();
     if (sig_buf == NULL) {

src/pki_crypto.c

@@ -831,7 +831,12 @@ ssh_string pki_private_key_to_pem(const ssh_key key,
         goto err;
     }
 
-    ssh_string_fill(blob, buf->data, buf->length);
+    rc = ssh_string_fill(blob, buf->data, buf->length);
+    if (rc < 0) {
+        ssh_string_free(blob);
+        goto err;
+    }
+
     BIO_free(mem);
 
     return blob;
@@ -1383,6 +1388,7 @@ static ssh_string pki_dsa_signature_to_blob(const ssh_signature sig)
 
     const unsigned char *raw_sig_data = NULL;
     size_t raw_sig_len;
+    int rc;
 
     DSA_SIG *dsa_sig;
 
@@ -1439,7 +1445,11 @@ static ssh_string pki_dsa_signature_to_blob(const ssh_signature sig)
         return NULL;
     }
 
-    ssh_string_fill(sig_blob, buffer, 40);
+    rc = ssh_string_fill(sig_blob, buffer, 40);
+    if (rc < 0) {
+        SSH_STRING_FREE(sig_blob);
+        return NULL;
+    }
 
     return sig_blob;
 
@@ -1516,7 +1526,10 @@ static ssh_string pki_ecdsa_signature_to_blob(const ssh_signature sig)
         goto error;
     }
 
-    ssh_string_fill(sig_blob, ssh_buffer_get(buf), ssh_buffer_get_len(buf));
+    rc = ssh_string_fill(sig_blob, ssh_buffer_get(buf), ssh_buffer_get_len(buf));
+    if (rc < 0) {
+        goto error;
+    }
 
     SSH_STRING_FREE(r);
     SSH_STRING_FREE(s);
@@ -1526,6 +1539,7 @@ static ssh_string pki_ecdsa_signature_to_blob(const ssh_signature sig)
     return sig_blob;
 
 error:
+    SSH_STRING_FREE(sig_blob);
     SSH_STRING_FREE(r);
     SSH_STRING_FREE(s);
     ECDSA_SIG_free(ecdsa_sig);
@@ -1670,7 +1684,11 @@ static int pki_signature_from_dsa_blob(UNUSED_PARAM(const ssh_key pubkey),
     if (r == NULL) {
         goto error;
     }
-    ssh_string_fill(r, ssh_string_data(sig_blob), 20);
+    rc = ssh_string_fill(r, ssh_string_data(sig_blob), 20);
+    if (rc < 0) {
+        SSH_STRING_FREE(r);
+        goto error;
+    }
 
     pr = ssh_make_string_bn(r);
     ssh_string_burn(r);
@@ -1683,7 +1701,11 @@ static int pki_signature_from_dsa_blob(UNUSED_PARAM(const ssh_key pubkey),
     if (s == NULL) {
         goto error;
     }
-    ssh_string_fill(s, (char *)ssh_string_data(sig_blob) + 20, 20);
+    rc = ssh_string_fill(s, (char *)ssh_string_data(sig_blob) + 20, 20);
+    if (rc < 0) {
+        SSH_STRING_FREE(s);
+        goto error;
+    }
 
     ps = ssh_make_string_bn(s);
     ssh_string_burn(s);
@@ -2269,8 +2291,12 @@ int pki_verify_data_signature(ssh_signature signature,
     unsigned char *raw_sig_data = NULL;
     unsigned int raw_sig_len;
 
+    /* Function return code
+     * Do not change this variable throughout the function until the signature
+     * is successfully verified!
+     */
     int rc = SSH_ERROR;
-    int evp_rc;
+    int ok;
 
     if (pubkey == NULL || ssh_key_is_private(pubkey) || input == NULL ||
         signature == NULL || (signature->raw_sig == NULL
@@ -2285,8 +2311,8 @@ int pki_verify_data_signature(ssh_signature signature,
     }
 
     /* Check if public key and hash type are compatible */
-    rc = pki_key_check_hash_compatible(pubkey, signature->hash_type);
-    if (rc != SSH_OK) {
+    ok = pki_key_check_hash_compatible(pubkey, signature->hash_type);
+    if (ok != SSH_OK) {
         return SSH_ERROR;
     }
 
@@ -2329,8 +2355,8 @@ int pki_verify_data_signature(ssh_signature signature,
     }
 
     /* Verify the signature */
-    evp_rc = EVP_DigestVerifyInit(ctx, NULL, md, NULL, pkey);
-    if (evp_rc != 1){
+    ok = EVP_DigestVerifyInit(ctx, NULL, md, NULL, pkey);
+    if (ok != 1){
         SSH_LOG(SSH_LOG_TRACE,
                 "EVP_DigestVerifyInit() failed: %s",
                 ERR_error_string(ERR_get_error(), NULL));
@@ -2338,35 +2364,31 @@ int pki_verify_data_signature(ssh_signature signature,
     }
 
 #ifdef HAVE_OPENSSL_EVP_DIGESTVERIFY
-    evp_rc = EVP_DigestVerify(ctx, raw_sig_data, raw_sig_len, input, input_len);
+    ok = EVP_DigestVerify(ctx, raw_sig_data, raw_sig_len, input, input_len);
 #else
-    evp_rc = EVP_DigestVerifyUpdate(ctx, input, input_len);
-    if (evp_rc != 1) {
+    ok = EVP_DigestVerifyUpdate(ctx, input, input_len);
+    if (ok != 1) {
         SSH_LOG(SSH_LOG_TRACE,
                 "EVP_DigestVerifyUpdate() failed: %s",
                 ERR_error_string(ERR_get_error(), NULL));
         goto out;
     }
 
-    evp_rc = EVP_DigestVerifyFinal(ctx, raw_sig_data, raw_sig_len);
+    ok = EVP_DigestVerifyFinal(ctx, raw_sig_data, raw_sig_len);
 #endif
-    if (evp_rc == 1) {
-        SSH_LOG(SSH_LOG_TRACE, "Signature valid");
-        rc = SSH_OK;
-    } else {
+    if (ok != 1) {
         SSH_LOG(SSH_LOG_TRACE,
                 "Signature invalid: %s",
                 ERR_error_string(ERR_get_error(), NULL));
-        rc = SSH_ERROR;
+        goto out;
     }
 
+    SSH_LOG(SSH_LOG_TRACE, "Signature valid");
+    rc = SSH_OK;
+
 out:
-    if (ctx != NULL) {
-        EVP_MD_CTX_free(ctx);
-    }
-    if (pkey != NULL) {
-        EVP_PKEY_free(pkey);
-    }
+    EVP_MD_CTX_free(ctx);
+    EVP_PKEY_free(pkey);
     return rc;
 }
 

src/pki_ed25519_common.c

@@ -214,6 +214,7 @@ int pki_ed25519_public_key_to_blob(ssh_buffer buffer, ssh_key key)
 ssh_string pki_ed25519_signature_to_blob(ssh_signature sig)
 {
     ssh_string sig_blob;
+    int rc;
 
 #ifdef HAVE_OPENSSL_ED25519
     /* When using the OpenSSL implementation, the signature is stored in raw_sig
@@ -235,11 +236,15 @@ ssh_string pki_ed25519_signature_to_blob(ssh_signature sig)
     }
 
 #ifdef HAVE_OPENSSL_ED25519
-    ssh_string_fill(sig_blob, ssh_string_data(sig->raw_sig),
-                    ssh_string_len(sig->raw_sig));
+    rc = ssh_string_fill(sig_blob, ssh_string_data(sig->raw_sig),
+                         ssh_string_len(sig->raw_sig));
 #else
-    ssh_string_fill(sig_blob, sig->ed25519_sig, ED25519_SIG_LEN);
+    rc = ssh_string_fill(sig_blob, sig->ed25519_sig, ED25519_SIG_LEN);
 #endif
+    if (rc < 0) {
+        SSH_STRING_FREE(sig_blob);
+        return NULL;
+    }
 
     return sig_blob;
 }

src/pki_gcrypt.c

@@ -1765,6 +1765,7 @@ ssh_string pki_signature_to_blob(const ssh_signature sig)
     gcry_sexp_t sexp;
     size_t size = 0;
     ssh_string sig_blob = NULL;
+    int rc;
 
     switch(sig->type) {
         case SSH_KEYTYPE_DSS:
@@ -1812,7 +1813,11 @@ ssh_string pki_signature_to_blob(const ssh_signature sig)
                 return NULL;
             }
 
-            ssh_string_fill(sig_blob, buffer, 40);
+            rc = ssh_string_fill(sig_blob, buffer, 40);
+            if (rc < 0) {
+                SSH_STRING_FREE(sig_blob);
+                return NULL;
+            }
             break;
         case SSH_KEYTYPE_RSA:
             sexp = gcry_sexp_find_token(sig->rsa_sig, "s", 0);
@@ -1829,13 +1834,16 @@ ssh_string pki_signature_to_blob(const ssh_signature sig)
             if (sig_blob == NULL) {
                 return NULL;
             }
-            ssh_string_fill(sig_blob, discard_const_p(char, s), size);
-
+            rc = ssh_string_fill(sig_blob, discard_const_p(char, s), size);
             gcry_sexp_release(sexp);
+            if (rc < 0) {
+                SSH_STRING_FREE(sig_blob);
+                return NULL;
+            }
             break;
         case SSH_KEYTYPE_ED25519:
-		sig_blob = pki_ed25519_signature_to_blob(sig);
-		break;
+            sig_blob = pki_ed25519_signature_to_blob(sig);
+            break;
         case SSH_KEYTYPE_ECDSA_P256:
         case SSH_KEYTYPE_ECDSA_P384:
         case SSH_KEYTYPE_ECDSA_P521:
@@ -1844,7 +1852,6 @@ ssh_string pki_signature_to_blob(const ssh_signature sig)
                 ssh_string R;
                 ssh_string S;
                 ssh_buffer b;
-                int rc;
 
                 b = ssh_buffer_new();
                 if (b == NULL) {
@@ -1885,9 +1892,13 @@ ssh_string pki_signature_to_blob(const ssh_signature sig)
                     return NULL;
                 }
 
-                ssh_string_fill(sig_blob,
+                rc = ssh_string_fill(sig_blob,
                                 ssh_buffer_get(b), ssh_buffer_get_len(b));
                 SSH_BUFFER_FREE(b);
+                if (rc < 0) {
+                    SSH_STRING_FREE(sig_blob);
+                    return NULL;
+                }
                 break;
             }
 #endif

src/pki_mbedcrypto.c

@@ -832,8 +832,13 @@ ssh_string pki_signature_to_blob(const ssh_signature sig)
                 return NULL;
             }
 
-            ssh_string_fill(sig_blob, ssh_buffer_get(b), ssh_buffer_get_len(b));
+            rc = ssh_string_fill(sig_blob, ssh_buffer_get(b), ssh_buffer_get_len(b));
             SSH_BUFFER_FREE(b);
+            if (rc < 0) {
+                SSH_STRING_FREE(sig_blob);
+                return NULL;
+            }
+
             break;
         }
         case SSH_KEYTYPE_ED25519:
@@ -1074,9 +1079,13 @@ static ssh_string rsa_do_sign_hash(const unsigned char *digest,
         return NULL;
     }
 
-    ssh_string_fill(sig_blob, sig, slen);
+    ok = ssh_string_fill(sig_blob, sig, slen);
     explicit_bzero(sig, slen);
     SAFE_FREE(sig);
+    if (ok < 0) {
+        SSH_STRING_FREE(sig_blob);
+        return NULL;
+    }
 
     return sig_blob;
 }

src/server.c

@@ -92,7 +92,11 @@ int server_set_kex(ssh_session session)
     size_t len;
     int ok;
 
-    ZERO_STRUCTP(server);
+    /* Skip if already set, for example for the rekey or when we do the guessing
+     * it could have been already used to make some protocol decisions. */
+    if (server->methods[0] != NULL) {
+        return SSH_OK;
+    }
 
     ok = ssh_get_random(server->cookie, 16, 0);
     if (!ok) {
@@ -335,117 +339,121 @@ ssh_get_key_params(ssh_session session,
  * @brief A function to be called each time a step has been done in the
  * connection.
  */
-static void ssh_server_connection_callback(ssh_session session){
+static void ssh_server_connection_callback(ssh_session session)
+{
     int rc;
 
-    switch(session->session_state){
-        case SSH_SESSION_STATE_NONE:
-        case SSH_SESSION_STATE_CONNECTING:
-        case SSH_SESSION_STATE_SOCKET_CONNECTED:
-            break;
-        case SSH_SESSION_STATE_BANNER_RECEIVED:
-            if (session->clientbanner == NULL) {
-                goto error;
-            }
-            set_status(session, 0.4f);
-            SSH_LOG(SSH_LOG_PROTOCOL,
-                    "SSH client banner: %s", session->clientbanner);
+    switch (session->session_state) {
+    case SSH_SESSION_STATE_NONE:
+    case SSH_SESSION_STATE_CONNECTING:
+    case SSH_SESSION_STATE_SOCKET_CONNECTED:
+        break;
+    case SSH_SESSION_STATE_BANNER_RECEIVED:
+        if (session->clientbanner == NULL) {
+            goto error;
+        }
+        set_status(session, 0.4f);
+        SSH_LOG(SSH_LOG_PROTOCOL,
+                "SSH client banner: %s", session->clientbanner);
 
-            /* Here we analyze the different protocols the server allows. */
-            rc = ssh_analyze_banner(session, 1);
-            if (rc < 0) {
-                ssh_set_error(session, SSH_FATAL,
-                        "No version of SSH protocol usable (banner: %s)",
-                        session->clientbanner);
+        /* Here we analyze the different protocols the server allows. */
+        rc = ssh_analyze_banner(session, 1);
+        if (rc < 0) {
+            ssh_set_error(session, SSH_FATAL,
+                          "No version of SSH protocol usable (banner: %s)",
+                          session->clientbanner);
+            goto error;
+        }
+
+        /* from now, the packet layer is handling incoming packets */
+        session->socket_callbacks.data = ssh_packet_socket_callback;
+        ssh_packet_register_socket_callback(session, session->socket);
+
+        ssh_packet_set_default_callbacks(session);
+        set_status(session, 0.5f);
+        session->session_state = SSH_SESSION_STATE_INITIAL_KEX;
+        if (ssh_send_kex(session) < 0) {
+            goto error;
+        }
+        break;
+    case SSH_SESSION_STATE_INITIAL_KEX:
+        /* TODO: This state should disappear in favor of get_key handle */
+        break;
+    case SSH_SESSION_STATE_KEXINIT_RECEIVED:
+        set_status(session, 0.6f);
+        if ((session->flags & SSH_SESSION_FLAG_KEXINIT_SENT) == 0) {
+            if (server_set_kex(session) == SSH_ERROR)
+                goto error;
+            /* We are in a rekeying, so we need to send the server kex */
+            if (ssh_send_kex(session) < 0)
+                goto error;
+        }
+        ssh_list_kex(&session->next_crypto->client_kex); // log client kex
+        if (ssh_kex_select_methods(session) < 0) {
+            goto error;
+        }
+        if (crypt_set_algorithms_server(session) == SSH_ERROR)
+            goto error;
+        set_status(session, 0.8f);
+        session->session_state = SSH_SESSION_STATE_DH;
+        break;
+    case SSH_SESSION_STATE_DH:
+        if (session->dh_handshake_state == DH_STATE_FINISHED) {
+
+            rc = ssh_packet_set_newkeys(session, SSH_DIRECTION_IN);
+            if (rc != SSH_OK) {
                 goto error;
             }
 
-            /* from now, the packet layer is handling incoming packets */
-            session->socket_callbacks.data=ssh_packet_socket_callback;
-            ssh_packet_register_socket_callback(session, session->socket);
-
-            ssh_packet_set_default_callbacks(session);
-            set_status(session, 0.5f);
-            session->session_state=SSH_SESSION_STATE_INITIAL_KEX;
-            if (ssh_send_kex(session, 1) < 0) {
-                goto error;
-            }
-            break;
-        case SSH_SESSION_STATE_INITIAL_KEX:
-            /* TODO: This state should disappear in favor of get_key handle */
-            break;
-        case SSH_SESSION_STATE_KEXINIT_RECEIVED:
-            set_status(session,0.6f);
-            if(session->next_crypto->server_kex.methods[0]==NULL){
-                if(server_set_kex(session) == SSH_ERROR)
-                    goto error;
-                /* We are in a rekeying, so we need to send the server kex */
-                if(ssh_send_kex(session, 1) < 0)
-                    goto error;
-            }
-            ssh_list_kex(&session->next_crypto->client_kex); // log client kex
-            if (ssh_kex_select_methods(session) < 0) {
-                goto error;
-            }
-            if (crypt_set_algorithms_server(session) == SSH_ERROR)
-                goto error;
-            set_status(session,0.8f);
-            session->session_state=SSH_SESSION_STATE_DH;
-            break;
-        case SSH_SESSION_STATE_DH:
-            if(session->dh_handshake_state==DH_STATE_FINISHED){
-
-                rc = ssh_packet_set_newkeys(session, SSH_DIRECTION_IN);
-                if (rc != SSH_OK) {
-                    goto error;
-                }
+            /*
+             * If the client supports extension negotiation, we will send
+             * our supported extensions now. This is the first message after
+             * sending NEWKEYS message and after turning on crypto.
+             */
+            if (session->extensions & SSH_EXT_NEGOTIATION &&
+                session->session_state != SSH_SESSION_STATE_AUTHENTICATED) {
 
                 /*
-                 * If the client supports extension negotiation, we will send
-                 * our supported extensions now. This is the first message after
-                 * sending NEWKEYS message and after turning on crypto.
+                 * Only send an SSH_MSG_EXT_INFO message the first time the
+                 * client undergoes NEWKEYS.  It is unexpected for this message
+                 * to be sent upon rekey, and may cause clients to log error
+                 * messages.
+                 *
+                 * The session_state can not be used for this purpose because it
+                 * is re-set to SSH_SESSION_STATE_KEXINIT_RECEIVED during rekey.
+                 * So, use the connected flag which transitions from non-zero
+                 * below.
+                 *
+                 * See also:
+                 * - https://bugzilla.mindrot.org/show_bug.cgi?id=2929
                  */
-                if (session->extensions & SSH_EXT_NEGOTIATION &&
-                    session->session_state != SSH_SESSION_STATE_AUTHENTICATED) {
-
-                    /*
-                     * Only send an SSH_MSG_EXT_INFO message the first time the client
-                     * undergoes NEWKEYS.  It is unexpected for this message to be sent
-                     * upon rekey, and may cause clients to log error messages.
-                     *
-                     * The session_state can not be used for this purpose because it is
-                     * re-set to SSH_SESSION_STATE_KEXINIT_RECEIVED during rekey.  So,
-                     * use the connected flag which transitions from non-zero below.
-                     *
-                     * See also:
-                     * - https://bugzilla.mindrot.org/show_bug.cgi?id=2929
-                     */
-                    if (session->connected == 0) {
-                        ssh_server_send_extensions(session);
-                    }
+                if (session->connected == 0) {
+                    ssh_server_send_extensions(session);
                 }
-
-                set_status(session,1.0f);
-                session->connected = 1;
-                session->session_state=SSH_SESSION_STATE_AUTHENTICATING;
-                if (session->flags & SSH_SESSION_FLAG_AUTHENTICATED)
-                    session->session_state = SSH_SESSION_STATE_AUTHENTICATED;
-
             }
-            break;
-        case SSH_SESSION_STATE_AUTHENTICATING:
-            break;
-        case SSH_SESSION_STATE_ERROR:
-            goto error;
-        default:
-            ssh_set_error(session,SSH_FATAL,"Invalid state %d",session->session_state);
+
+            set_status(session, 1.0f);
+            session->connected = 1;
+            session->session_state = SSH_SESSION_STATE_AUTHENTICATING;
+            if (session->flags & SSH_SESSION_FLAG_AUTHENTICATED)
+                session->session_state = SSH_SESSION_STATE_AUTHENTICATED;
+
+        }
+        break;
+    case SSH_SESSION_STATE_AUTHENTICATING:
+        break;
+    case SSH_SESSION_STATE_ERROR:
+        goto error;
+    default:
+        ssh_set_error(session, SSH_FATAL, "Invalid state %d",
+                      session->session_state);
     }
 
     return;
 error:
     ssh_socket_close(session->socket);
     session->alive = 0;
-    session->session_state=SSH_SESSION_STATE_ERROR;
+    session->session_state = SSH_SESSION_STATE_ERROR;
 }
 
 /**
@@ -459,16 +467,17 @@ error:
  * @param  user is a pointer to session
  * @returns Number of bytes processed, or zero if the banner is not complete.
  */
-static int callback_receive_banner(const void *data, size_t len, void *user) {
-    char *buffer = (char *) data;
-    ssh_session session = (ssh_session) user;
+static int callback_receive_banner(const void *data, size_t len, void *user)
+{
+    char *buffer = (char *)data;
+    ssh_session session = (ssh_session)user;
     char *str = NULL;
     size_t i;
     int ret=0;
 
     for (i = 0; i < len; i++) {
 #ifdef WITH_PCAP
-        if(session->pcap_ctx && buffer[i] == '\n') {
+        if (session->pcap_ctx && buffer[i] == '\n') {
             ssh_pcap_context_write(session->pcap_ctx,
                                    SSH_PCAP_DIR_IN,
                                    buffer,
@@ -477,11 +486,11 @@ static int callback_receive_banner(const void *data, size_t len, void *user) {
         }
 #endif
         if (buffer[i] == '\r') {
-            buffer[i]='\0';
+            buffer[i] = '\0';
         }
 
         if (buffer[i] == '\n') {
-            buffer[i]='\0';
+            buffer[i] = '\0';
 
             str = strdup(buffer);
             /* number of bytes read */
@@ -494,10 +503,11 @@ static int callback_receive_banner(const void *data, size_t len, void *user) {
             return ret;
         }
 
-        if(i > 127) {
+        if (i > 127) {
             /* Too big banner */
             session->session_state = SSH_SESSION_STATE_ERROR;
-            ssh_set_error(session, SSH_FATAL, "Receiving banner: too large banner");
+            ssh_set_error(session, SSH_FATAL,
+                          "Receiving banner: too large banner");
 
             return 0;
         }
@@ -525,10 +535,14 @@ void ssh_set_auth_methods(ssh_session session, int auth_methods)
 }
 
 /* Do the banner and key exchange */
-int ssh_handle_key_exchange(ssh_session session) {
+int ssh_handle_key_exchange(ssh_session session)
+{
     int rc;
-    if (session->session_state != SSH_SESSION_STATE_NONE)
-      goto pending;
+
+    if (session->session_state != SSH_SESSION_STATE_NONE) {
+        goto pending;
+    }
+
     rc = ssh_send_banner(session, 1);
     if (rc < 0) {
         return SSH_ERROR;
@@ -539,27 +553,28 @@ int ssh_handle_key_exchange(ssh_session session) {
     session->ssh_connection_callback = ssh_server_connection_callback;
     session->session_state = SSH_SESSION_STATE_SOCKET_CONNECTED;
     ssh_socket_set_callbacks(session->socket,&session->socket_callbacks);
-    session->socket_callbacks.data=callback_receive_banner;
-    session->socket_callbacks.exception=ssh_socket_exception_callback;
-    session->socket_callbacks.userdata=session;
+    session->socket_callbacks.data = callback_receive_banner;
+    session->socket_callbacks.exception = ssh_socket_exception_callback;
+    session->socket_callbacks.userdata = session;
 
     rc = server_set_kex(session);
     if (rc < 0) {
         return SSH_ERROR;
     }
-    pending:
+pending:
     rc = ssh_handle_packets_termination(session, SSH_TIMEOUT_USER,
-        ssh_server_kex_termination,session);
+                                        ssh_server_kex_termination,session);
     SSH_LOG(SSH_LOG_PACKET, "ssh_handle_key_exchange: current state : %d",
-        session->session_state);
-    if (rc != SSH_OK)
-      return rc;
+            session->session_state);
+    if (rc != SSH_OK) {
+        return rc;
+    }
     if (session->session_state == SSH_SESSION_STATE_ERROR ||
         session->session_state == SSH_SESSION_STATE_DISCONNECTED) {
-      return SSH_ERROR;
+        return SSH_ERROR;
     }
 
-  return SSH_OK;
+    return SSH_OK;
 }
 
 /* messages */

src/sftp.c

@@ -32,6 +32,9 @@
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdint.h>
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif /* HAVE_SYS_TIME_H */
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <limits.h>
@@ -173,32 +176,56 @@ error:
     return NULL;
 }
 
-sftp_session sftp_new_channel(ssh_session session, ssh_channel channel){
-  sftp_session sftp;
+sftp_session
+sftp_new_channel(ssh_session session, ssh_channel channel)
+{
+    sftp_session sftp = NULL;
 
-  if (session == NULL) {
-    return NULL;
-  }
+    if (session == NULL) {
+        return NULL;
+    }
 
-  sftp = calloc(1, sizeof(struct sftp_session_struct));
-  if (sftp == NULL) {
-    ssh_set_error_oom(session);
+    sftp = calloc(1, sizeof(struct sftp_session_struct));
+    if (sftp == NULL) {
+        ssh_set_error_oom(session);
+        return NULL;
+    }
 
-    return NULL;
-  }
+    sftp->ext = sftp_ext_new();
+    if (sftp->ext == NULL) {
+        ssh_set_error_oom(session);
+        goto error;
+    }
 
-  sftp->ext = sftp_ext_new();
-  if (sftp->ext == NULL) {
-    ssh_set_error_oom(session);
+    sftp->read_packet = calloc(1, sizeof(struct sftp_packet_struct));
+    if (sftp->read_packet == NULL) {
+        ssh_set_error_oom(session);
+        goto error;
+    }
+
+    sftp->read_packet->payload = ssh_buffer_new();
+    if (sftp->read_packet->payload == NULL) {
+        ssh_set_error_oom(session);
+        goto error;
+    }
+
+    sftp->session = session;
+    sftp->channel = channel;
+
+    return sftp;
+
+error:
+    if (sftp->ext != NULL) {
+        sftp_ext_free(sftp->ext);
+    }
+    if (sftp->read_packet != NULL) {
+        if (sftp->read_packet->payload != NULL) {
+            SSH_BUFFER_FREE(sftp->read_packet->payload);
+        }
+        SAFE_FREE(sftp->read_packet);
+    }
     SAFE_FREE(sftp);
-
     return NULL;
-  }
-
-  sftp->session = session;
-  sftp->channel = channel;
-
-  return sftp;
 }
 
 #ifdef WITH_SERVER

src/threads/winlocks.c

@@ -26,6 +26,7 @@
 #include <windows.h>
 #include <winbase.h>
 #include <errno.h>
+#include <stdlib.h>
 
 static int ssh_winlock_mutex_init (void **priv)
 {

src/token.c

@@ -87,7 +87,7 @@ struct ssh_tokens_st *ssh_tokenize(const char *chain, char separator)
         return NULL;
     }
 
-    tokens->buffer= strdup(chain);
+    tokens->buffer = strdup(chain);
     if (tokens->buffer == NULL) {
         goto error;
     }

src/wrapper.c

@@ -147,15 +147,16 @@ static void cipher_free(struct ssh_cipher_struct *cipher) {
   SAFE_FREE(cipher);
 }
 
-struct ssh_crypto_struct *crypto_new(void) {
-   struct ssh_crypto_struct *crypto;
+struct ssh_crypto_struct *crypto_new(void)
+{
+    struct ssh_crypto_struct *crypto;
 
-  crypto = malloc(sizeof(struct ssh_crypto_struct));
-  if (crypto == NULL) {
-    return NULL;
-  }
-  ZERO_STRUCTP(crypto);
-  return crypto;
+    crypto = malloc(sizeof(struct ssh_crypto_struct));
+    if (crypto == NULL) {
+        return NULL;
+    }
+    ZERO_STRUCTP(crypto);
+    return crypto;
 }
 
 void crypto_free(struct ssh_crypto_struct *crypto)
@@ -182,8 +183,9 @@ void crypto_free(struct ssh_crypto_struct *crypto)
         crypto->ecdh_privkey = NULL;
     }
 #endif
+    SAFE_FREE(crypto->dh_server_signature);
     if (crypto->session_id != NULL) {
-        explicit_bzero(crypto->session_id, crypto->digest_len);
+        explicit_bzero(crypto->session_id, crypto->session_id_len);
         SAFE_FREE(crypto->session_id);
     }
     if (crypto->secret_hash != NULL) {

tests/client/CMakeLists.txt

@@ -37,6 +37,7 @@ if (WITH_SFTP)
     endif()
     set(LIBSSH_CLIENT_TESTS
         ${LIBSSH_CLIENT_TESTS}
+        torture_sftp_init
         torture_sftp_ext
         torture_sftp_canonicalize_path
         torture_sftp_dir

tests/client/torture_algorithms.c

@@ -45,6 +45,16 @@ static int sshd_teardown(void **state) {
     return 0;
 }
 
+static int sshd_setup_hmac(void **state)
+{
+    torture_setup_sshd_server(state, false);
+    /* Set MAC to be something other than what the client will offer */
+    torture_update_sshd_config(state, "MACs hmac-sha2-512");
+
+    return 0;
+}
+
+
 static int session_setup(void **state) {
     struct torture_state *s = *state;
     int verbosity = torture_libssh_verbosity();
@@ -412,6 +422,20 @@ static void torture_algorithms_aes256_gcm(void **state)
     test_algorithm(s->ssh.session, NULL/*kex*/, "aes256-gcm@openssh.com", NULL);
 }
 
+static void torture_algorithms_aes128_gcm_mac(void **state)
+{
+    struct torture_state *s = *state;
+
+    test_algorithm(s->ssh.session, NULL/*kex*/, "aes128-gcm@openssh.com", "hmac-sha1");
+}
+
+static void torture_algorithms_aes256_gcm_mac(void **state)
+{
+    struct torture_state *s = *state;
+
+    test_algorithm(s->ssh.session, NULL/*kex*/, "aes256-gcm@openssh.com", "hmac-sha1");
+}
+
 static void torture_algorithms_3des_cbc_hmac_sha1(void **state) {
     struct torture_state *s = *state;
 
@@ -548,6 +572,19 @@ static void torture_algorithms_chacha20_poly1305(void **state)
                    "chacha20-poly1305@openssh.com",
                    NULL);
 }
+static void torture_algorithms_chacha20_poly1305_mac(void **state)
+{
+    struct torture_state *s = *state;
+
+    if (ssh_fips_mode()) {
+        skip();
+    }
+
+    test_algorithm(s->ssh.session,
+                   NULL, /*kex*/
+                   "chacha20-poly1305@openssh.com",
+                   "hmac-sha1"); /* different from the server */
+}
 #endif /* OPENSSH_CHACHA20_POLY1305_OPENSSH_COM */
 
 static void torture_algorithms_zlib(void **state) {
@@ -951,10 +988,30 @@ int torture_run_tests(void) {
 #endif
     };
 
+    struct CMUnitTest tests_hmac[] = {
+        cmocka_unit_test_setup_teardown(torture_algorithms_aes128_gcm_mac,
+                                        session_setup,
+                                        session_teardown),
+        cmocka_unit_test_setup_teardown(torture_algorithms_aes256_gcm_mac,
+                                        session_setup,
+                                        session_teardown),
+#ifdef OPENSSH_CHACHA20_POLY1305_OPENSSH_COM
+        cmocka_unit_test_setup_teardown(torture_algorithms_chacha20_poly1305_mac,
+                                        session_setup,
+                                        session_teardown),
+#endif /* OPENSSH_CHACHA20_POLY1305_OPENSSH_COM */
+    };
+
     ssh_init();
 
     torture_filter_tests(tests);
     rc = cmocka_run_group_tests(tests, sshd_setup, sshd_teardown);
+    if (rc != 0) {
+        return rc;
+    }
+
+    torture_filter_tests(tests);
+    rc = cmocka_run_group_tests(tests_hmac, sshd_setup_hmac, sshd_teardown);
 
     ssh_finalize();
 

tests/client/torture_auth.c

@@ -200,7 +200,8 @@ static int agent_teardown(void **state)
     assert_non_null(ssh_agent_pidfile);
 
     /* kill agent pid */
-    torture_terminate_process(ssh_agent_pidfile);
+    rc = torture_terminate_process(ssh_agent_pidfile);
+    assert_return_code(rc, errno);
 
     unlink(ssh_agent_pidfile);
 
@@ -551,6 +552,7 @@ static void torture_auth_cert(void **state) {
 
 static void torture_auth_agent_cert(void **state)
 {
+#if OPENSSH_VERSION_MAJOR < 8 || (OPENSSH_VERSION_MAJOR == 8 && OPENSSH_VERSION_MINOR == 0)
     struct torture_state *s = *state;
     ssh_session session = s->ssh.session;
     int rc;
@@ -570,6 +572,7 @@ static void torture_auth_agent_cert(void **state)
                              "ssh-rsa-cert-v01@openssh.com");
         assert_int_equal(rc, SSH_OK);
     }
+#endif /* OPENSSH_VERSION_MAJOR < 8.1 */
 
     /* Setup loads a different key, tests are exactly the same. */
     torture_auth_agent(state);
@@ -577,6 +580,7 @@ static void torture_auth_agent_cert(void **state)
 
 static void torture_auth_agent_cert_nonblocking(void **state)
 {
+#if OPENSSH_VERSION_MAJOR < 8 || (OPENSSH_VERSION_MAJOR == 8 && OPENSSH_VERSION_MINOR == 0)
     struct torture_state *s = *state;
     ssh_session session = s->ssh.session;
     int rc;
@@ -596,6 +600,7 @@ static void torture_auth_agent_cert_nonblocking(void **state)
                              "ssh-rsa-cert-v01@openssh.com");
         assert_int_equal(rc, SSH_OK);
     }
+#endif /* OPENSSH_VERSION_MAJOR < 8.1 */
 
     torture_auth_agent_nonblocking(state);
 }

tests/client/torture_rekey.c

@@ -38,6 +38,10 @@
 #include <fcntl.h>
 #include <pwd.h>
 
+#define KEX_RETRY 32
+
+static uint64_t bytes = 2048; /* 2KB (more than the authentication phase) */
+
 static int sshd_setup(void **state)
 {
     torture_setup_sshd_server(state, false);
@@ -153,7 +157,6 @@ static void torture_rekey_send(void **state)
     int rc;
     char data[256];
     unsigned int i;
-    uint64_t bytes = 2048; /* 2KB (more than the authentication phase) */
     struct ssh_crypto_struct *c = NULL;
     unsigned char *secret_hash = NULL;
 
@@ -189,10 +192,11 @@ static void torture_rekey_send(void **state)
     rc = ssh_userauth_publickey_auto(s->ssh.session, NULL, NULL);
     assert_int_equal(rc, SSH_AUTH_SUCCESS);
 
-    /* send ignore packets of up to 1KB to trigger rekey */
+    /* send ignore packets of up to 1KB to trigger rekey. Send little bit more
+     * to make sure it completes with all different ciphers */
     memset(data, 0, sizeof(data));
     memset(data, 'A', 128);
-    for (i = 0; i < 16; i++) {
+    for (i = 0; i < KEX_RETRY; i++) {
         ssh_send_ignore(s->ssh.session, data);
         ssh_handle_packets(s->ssh.session, 50);
     }
@@ -234,8 +238,6 @@ static void session_setup_sftp(void **state)
     assert_non_null(s->ssh.tsftp);
 }
 
-uint64_t bytes = 2048; /* 2KB */
-
 static int session_setup_sftp_client(void **state)
 {
     struct torture_state *s = *state;
@@ -439,6 +441,165 @@ static void torture_rekey_server_send(void **state)
     ssh_disconnect(s->ssh.session);
 }
 
+static void torture_rekey_different_kex(void **state)
+{
+    struct torture_state *s = *state;
+    int rc;
+    char data[256];
+    unsigned int i;
+    struct ssh_crypto_struct *c = NULL;
+    unsigned char *secret_hash = NULL;
+    size_t secret_hash_len = 0;
+    const char *kex1 = "diffie-hellman-group14-sha256,curve25519-sha256,ecdh-sha2-nistp256";
+    const char *kex2 = "diffie-hellman-group18-sha512,diffie-hellman-group16-sha512,ecdh-sha2-nistp521";
+
+    /* Use short digest for initial key exchange */
+    rc = ssh_options_set(s->ssh.session, SSH_OPTIONS_KEY_EXCHANGE, kex1);
+    assert_ssh_return_code(s->ssh.session, rc);
+
+    rc = ssh_options_set(s->ssh.session, SSH_OPTIONS_REKEY_DATA, &bytes);
+    assert_ssh_return_code(s->ssh.session, rc);
+
+    rc = ssh_connect(s->ssh.session);
+    assert_ssh_return_code(s->ssh.session, rc);
+
+    /* The blocks limit is set correctly */
+    c = s->ssh.session->current_crypto;
+    assert_int_equal(c->in_cipher->max_blocks,
+                     bytes / c->in_cipher->blocksize);
+    assert_int_equal(c->out_cipher->max_blocks,
+                     bytes / c->out_cipher->blocksize);
+    /* We should have less encrypted packets than transfered (first are not encrypted) */
+    assert_true(c->out_cipher->packets < s->ssh.session->send_seq);
+    assert_true(c->in_cipher->packets < s->ssh.session->recv_seq);
+    /* Copy the initial secret hash = session_id so we know we changed keys later */
+    secret_hash = malloc(c->digest_len);
+    assert_non_null(secret_hash);
+    memcpy(secret_hash, c->secret_hash, c->digest_len);
+    secret_hash_len = c->digest_len;
+    assert_int_equal(secret_hash_len, 32); /* SHA256 len */
+
+    /* OpenSSH can not rekey before authentication so authenticate here */
+    rc = ssh_userauth_none(s->ssh.session, NULL);
+    /* This request should return a SSH_REQUEST_DENIED error */
+    if (rc == SSH_ERROR) {
+        assert_int_equal(ssh_get_error_code(s->ssh.session), SSH_REQUEST_DENIED);
+    }
+    rc = ssh_userauth_list(s->ssh.session, NULL);
+    assert_true(rc & SSH_AUTH_METHOD_PUBLICKEY);
+
+    rc = ssh_userauth_publickey_auto(s->ssh.session, NULL, NULL);
+    assert_int_equal(rc, SSH_AUTH_SUCCESS);
+
+    /* Now try to change preference of key exchange algorithm to something with larger digest */
+    rc = ssh_options_set(s->ssh.session, SSH_OPTIONS_KEY_EXCHANGE, kex2);
+    assert_ssh_return_code(s->ssh.session, rc);
+
+    /* send ignore packets of up to 1KB to trigger rekey. Send litle bit more
+     * to make sure the rekey it completes with all different ciphers (paddings */
+    memset(data, 0, sizeof(data));
+    memset(data, 'A', 128);
+    for (i = 0; i < KEX_RETRY; i++) {
+        ssh_send_ignore(s->ssh.session, data);
+        ssh_handle_packets(s->ssh.session, 100);
+
+        c = s->ssh.session->current_crypto;
+        /* SHA256 len */
+        if (c->digest_len != 32) {
+            break;
+        }
+    }
+
+    /* The rekey limit was restored in the new crypto to the same value */
+    c = s->ssh.session->current_crypto;
+    assert_int_equal(c->in_cipher->max_blocks, bytes / c->in_cipher->blocksize);
+    assert_int_equal(c->out_cipher->max_blocks, bytes / c->out_cipher->blocksize);
+    /* Check that the secret hash is different than initially */
+    assert_int_equal(c->digest_len, 64); /* SHA512 len */
+    assert_memory_not_equal(secret_hash, c->secret_hash, secret_hash_len);
+    /* Session ID stays same after one rekey */
+    assert_memory_equal(secret_hash, c->session_id, secret_hash_len);
+    free(secret_hash);
+
+    assert_int_equal(ssh_is_connected(s->ssh.session), 1);
+    assert_int_equal(s->ssh.session->session_state, SSH_SESSION_STATE_AUTHENTICATED);
+
+    ssh_disconnect(s->ssh.session);
+}
+
+static void torture_rekey_server_different_kex(void **state)
+{
+    struct torture_state *s = *state;
+    int rc;
+    char data[256];
+    unsigned int i;
+    struct ssh_crypto_struct *c = NULL;
+    unsigned char *secret_hash = NULL;
+    size_t secret_hash_len = 0;
+    const char *sshd_config = "RekeyLimit 2K none";
+    const char *kex1 = "diffie-hellman-group14-sha256,curve25519-sha256,ecdh-sha2-nistp256";
+    const char *kex2 = "diffie-hellman-group18-sha512,diffie-hellman-group16-sha512";
+
+    /* Use short digest for initial key exchange */
+    rc = ssh_options_set(s->ssh.session, SSH_OPTIONS_KEY_EXCHANGE, kex1);
+    assert_ssh_return_code(s->ssh.session, rc);
+
+    torture_update_sshd_config(state, sshd_config);
+
+    rc = ssh_connect(s->ssh.session);
+    assert_ssh_return_code(s->ssh.session, rc);
+
+    /* Copy the initial secret hash = session_id so we know we changed keys later */
+    c = s->ssh.session->current_crypto;
+    secret_hash = malloc(c->digest_len);
+    assert_non_null(secret_hash);
+    memcpy(secret_hash, c->secret_hash, c->digest_len);
+    secret_hash_len = c->digest_len;
+    assert_int_equal(secret_hash_len, 32); /* SHA256 len */
+
+    /* OpenSSH can not rekey before authentication so authenticate here */
+    rc = ssh_userauth_none(s->ssh.session, NULL);
+    /* This request should return a SSH_REQUEST_DENIED error */
+    if (rc == SSH_ERROR) {
+        assert_int_equal(ssh_get_error_code(s->ssh.session), SSH_REQUEST_DENIED);
+    }
+    rc = ssh_userauth_list(s->ssh.session, NULL);
+    assert_true(rc & SSH_AUTH_METHOD_PUBLICKEY);
+
+    rc = ssh_userauth_publickey_auto(s->ssh.session, NULL, NULL);
+    assert_int_equal(rc, SSH_AUTH_SUCCESS);
+
+    /* Now try to change preference of key exchange algorithm to something with larger digest */
+    rc = ssh_options_set(s->ssh.session, SSH_OPTIONS_KEY_EXCHANGE, kex2);
+    assert_ssh_return_code(s->ssh.session, rc);
+
+    /* send ignore packets of up to 1KB to trigger rekey. Send litle bit more
+     * to make sure the rekey it completes with all different ciphers (paddings */
+    memset(data, 0, sizeof(data));
+    memset(data, 'A', 128);
+    for (i = 0; i < KEX_RETRY; i++) {
+        ssh_send_ignore(s->ssh.session, data);
+        ssh_handle_packets(s->ssh.session, 100);
+
+        c = s->ssh.session->current_crypto;
+        /* SHA256 len */
+        if (c->digest_len != 32) {
+            break;
+        }
+    }
+
+    /* Check that the secret hash is different than initially */
+    c = s->ssh.session->current_crypto;
+    assert_int_equal(c->digest_len, 64); /* SHA512 len */
+    assert_memory_not_equal(secret_hash, c->secret_hash, secret_hash_len);
+    /* Session ID stays same after one rekey */
+    assert_memory_equal(secret_hash, c->session_id, secret_hash_len);
+    free(secret_hash);
+
+    ssh_disconnect(s->ssh.session);
+}
+
+
 #ifdef WITH_SFTP
 static int session_setup_sftp_server(void **state)
 {
@@ -505,6 +666,92 @@ static void torture_rekey_server_recv(void **state)
 #endif /* WITH_SFTP */
 
 
+static void setup_server_for_good_guess(void *state)
+{
+    const char *default_sshd_config = "KexAlgorithms curve25519-sha256";
+    const char *fips_sshd_config = "KexAlgorithms ecdh-sha2-nistp256";
+    const char *sshd_config = default_sshd_config;
+
+    if (ssh_fips_mode()) {
+        sshd_config = fips_sshd_config;
+    }
+    /* This sets an only supported kex algorithm that we do not have as a first
+    * option */
+    torture_update_sshd_config(state, sshd_config);
+}
+
+static void torture_rekey_guess_send(void **state)
+{
+    struct torture_state *s = *state;
+
+    setup_server_for_good_guess(state);
+
+    /* Make the client send the first_kex_packet_follows flag during key
+     * exchange as well as during the rekey */
+    s->ssh.session->send_first_kex_follows = true;
+
+    torture_rekey_send(state);
+}
+
+static void torture_rekey_guess_wrong_send(void **state)
+{
+    struct torture_state *s = *state;
+    const char *sshd_config = "KexAlgorithms diffie-hellman-group14-sha256";
+
+    /* This sets an only supported kex algorithm that we do not have as a first
+     * option */
+    torture_update_sshd_config(state, sshd_config);
+
+    /* Make the client send the first_kex_packet_follows flag during key
+     * exchange as well as during the rekey */
+    s->ssh.session->send_first_kex_follows = true;
+
+    torture_rekey_send(state);
+}
+
+#ifdef WITH_SFTP
+static void torture_rekey_guess_recv(void **state)
+{
+    struct torture_state *s = *state;
+    int rc;
+
+    setup_server_for_good_guess(state);
+
+    /* Make the client send the first_kex_packet_follows flag during key
+     * exchange as well as during the rekey */
+    s->ssh.session->send_first_kex_follows = true;
+
+    rc = ssh_options_set(s->ssh.session, SSH_OPTIONS_REKEY_DATA, &bytes);
+    assert_ssh_return_code(s->ssh.session, rc);
+
+    session_setup_sftp(state);
+
+    torture_rekey_recv(state);
+}
+
+static void torture_rekey_guess_wrong_recv(void **state)
+{
+    struct torture_state *s = *state;
+    const char *sshd_config = "KexAlgorithms diffie-hellman-group14-sha256";
+    int rc;
+
+    /* This sets an only supported kex algorithm that we do not have as a first
+     * option */
+    torture_update_sshd_config(state, sshd_config);
+
+    /* Make the client send the first_kex_packet_follows flag during key
+     * exchange as well as during the rekey */
+    s->ssh.session->send_first_kex_follows = true;
+
+    rc = ssh_options_set(s->ssh.session, SSH_OPTIONS_REKEY_DATA, &bytes);
+    assert_ssh_return_code(s->ssh.session, rc);
+
+    session_setup_sftp(state);
+
+    torture_rekey_recv(state);
+}
+#endif /* WITH_SFTP */
+
 int torture_run_tests(void) {
     int rc;
     struct CMUnitTest tests[] = {
@@ -522,16 +769,37 @@ int torture_run_tests(void) {
         cmocka_unit_test_setup_teardown(torture_rekey_send,
                                         session_setup,
                                         session_teardown),
-        /* Note, that this modifies the sshd_config */
+        cmocka_unit_test_setup_teardown(torture_rekey_different_kex,
+                                        session_setup,
+                                        session_teardown),
+        /* TODO verify the two rekey are possible and the states are not broken after rekey */
+
+        cmocka_unit_test_setup_teardown(torture_rekey_server_different_kex,
+                                        session_setup,
+                                        session_teardown),
+        /* Note, that these tests modify the sshd_config so follow-up tests
+         * might get unexpected behavior if they do not update the server with
+         * torture_update_sshd_config() too */
         cmocka_unit_test_setup_teardown(torture_rekey_server_send,
                                         session_setup,
                                         session_teardown),
+        cmocka_unit_test_setup_teardown(torture_rekey_guess_send,
+                                        session_setup,
+                                        session_teardown),
+        cmocka_unit_test_setup_teardown(torture_rekey_guess_wrong_send,
+                                        session_setup,
+                                        session_teardown),
 #ifdef WITH_SFTP
         cmocka_unit_test_setup_teardown(torture_rekey_server_recv,
                                         session_setup_sftp_server,
                                         session_teardown),
+        cmocka_unit_test_setup_teardown(torture_rekey_guess_recv,
+                                        session_setup,
+                                        session_teardown),
+        cmocka_unit_test_setup_teardown(torture_rekey_guess_wrong_recv,
+                                        session_setup,
+                                        session_teardown),
 #endif /* WITH_SFTP */
-        /* TODO verify the two rekey are possible and the states are not broken after rekey */
     };
 
     ssh_init();

tests/client/torture_sftp_init.c

@@ -0,0 +1,106 @@
+#include "config.h"
+
+#define LIBSSH_STATIC
+
+#include "torture.h"
+#include "sftp.c"
+
+#include <sys/types.h>
+#include <pwd.h>
+#include <errno.h>
+
+static int sshd_setup(void **state)
+{
+    torture_setup_sshd_server(state, false);
+
+    return 0;
+}
+
+static int sshd_teardown(void **state) {
+    torture_teardown_sshd_server(state);
+
+    return 0;
+}
+
+static void session_setup(void **state)
+{
+    struct torture_state *s = *state;
+    struct passwd *pwd;
+    int rc;
+
+    pwd = getpwnam("bob");
+    assert_non_null(pwd);
+
+    rc = setuid(pwd->pw_uid);
+    assert_return_code(rc, errno);
+
+    s->ssh.session = torture_ssh_session(s,
+                                         TORTURE_SSH_SERVER,
+                                         NULL,
+                                         TORTURE_SSH_USER_ALICE,
+                                         NULL);
+    assert_non_null(s->ssh.session);
+
+    s->ssh.tsftp = torture_sftp_session(s->ssh.session);
+    assert_non_null(s->ssh.tsftp);
+}
+
+static void session_setup_channel(void **state)
+{
+    struct torture_state *s = *state;
+    struct passwd *pwd = NULL;
+    ssh_channel c = NULL;
+    int rc;
+
+    pwd = getpwnam("bob");
+    assert_non_null(pwd);
+
+    rc = setuid(pwd->pw_uid);
+    assert_return_code(rc, errno);
+
+    s->ssh.session = torture_ssh_session(s,
+                                         TORTURE_SSH_SERVER,
+                                         NULL,
+                                         TORTURE_SSH_USER_ALICE,
+                                         NULL);
+    assert_non_null(s->ssh.session);
+
+    c = ssh_channel_new(s->ssh.session);
+    assert_non_null(c);
+
+    s->ssh.tsftp = torture_sftp_session_channel(s->ssh.session, c);
+    assert_non_null(s->ssh.tsftp);
+}
+
+static int session_teardown(void **state)
+{
+    struct torture_state *s = *state;
+
+    torture_rmdirs(s->ssh.tsftp->testdir);
+    torture_sftp_close(s->ssh.tsftp);
+    ssh_disconnect(s->ssh.session);
+    ssh_free(s->ssh.session);
+
+    return 0;
+}
+
+int torture_run_tests(void) {
+    int rc;
+    struct CMUnitTest tests[] = {
+        cmocka_unit_test_setup_teardown(session_setup,
+                                        NULL,
+                                        session_teardown),
+        cmocka_unit_test_setup_teardown(session_setup_channel,
+                                        NULL,
+                                        session_teardown)
+    };
+
+    ssh_init();
+
+    torture_filter_tests(tests);
+    rc = cmocka_run_group_tests(tests, sshd_setup, sshd_teardown);
+
+    ssh_finalize();
+
+    return rc;
+}

tests/pkd/pkd_hello.c

@@ -392,45 +392,37 @@ static int torture_pkd_setup_ecdsa_521(void **state) {
 #endif
 
 
-#define PKDTESTS_CIPHER_FIPS(f, client, ciphercmd) \
-    f(client, rsa_aes128_cbc,          ciphercmd("aes128-cbc"),    setup_rsa,        teardown) \
+#define PKDTESTS_CIPHER_COMMON(f, client, ciphercmd) \
     f(client, rsa_aes128_ctr,          ciphercmd("aes128-ctr"),    setup_rsa,        teardown) \
-    f(client, rsa_aes256_cbc,          ciphercmd("aes256-cbc"),    setup_rsa,        teardown) \
     f(client, rsa_aes256_ctr,          ciphercmd("aes256-ctr"),    setup_rsa,        teardown) \
-    f(client, ecdsa_256_aes128_cbc,    ciphercmd("aes128-cbc"),    setup_ecdsa_256,  teardown) \
     f(client, ecdsa_256_aes128_ctr,    ciphercmd("aes128-ctr"),    setup_ecdsa_256,  teardown) \
-    f(client, ecdsa_256_aes256_cbc,    ciphercmd("aes256-cbc"),    setup_ecdsa_256,  teardown) \
     f(client, ecdsa_256_aes256_ctr,    ciphercmd("aes256-ctr"),    setup_ecdsa_256,  teardown) \
-    f(client, ecdsa_384_aes128_cbc,    ciphercmd("aes128-cbc"),    setup_ecdsa_384,  teardown) \
     f(client, ecdsa_384_aes128_ctr,    ciphercmd("aes128-ctr"),    setup_ecdsa_384,  teardown) \
-    f(client, ecdsa_384_aes256_cbc,    ciphercmd("aes256-cbc"),    setup_ecdsa_384,  teardown) \
     f(client, ecdsa_384_aes256_ctr,    ciphercmd("aes256-ctr"),    setup_ecdsa_384,  teardown) \
-    f(client, ecdsa_521_aes128_cbc,    ciphercmd("aes128-cbc"),    setup_ecdsa_521,  teardown) \
     f(client, ecdsa_521_aes128_ctr,    ciphercmd("aes128-ctr"),    setup_ecdsa_521,  teardown) \
-    f(client, ecdsa_521_aes256_cbc,    ciphercmd("aes256-cbc"),    setup_ecdsa_521,  teardown) \
     f(client, ecdsa_521_aes256_ctr,    ciphercmd("aes256-ctr"),    setup_ecdsa_521,  teardown)
 
+#define PKDTESTS_CIPHER_FIPS(f, client, ciphercmd) \
+    PKDTESTS_CIPHER_COMMON(f, client, ciphercmd) \
+    f(client, rsa_aes128_cbc,          ciphercmd("aes128-cbc"),    setup_rsa,        teardown) \
+    f(client, rsa_aes256_cbc,          ciphercmd("aes256-cbc"),    setup_rsa,        teardown) \
+    f(client, ecdsa_256_aes128_cbc,    ciphercmd("aes128-cbc"),    setup_ecdsa_256,  teardown) \
+    f(client, ecdsa_256_aes256_cbc,    ciphercmd("aes256-cbc"),    setup_ecdsa_256,  teardown) \
+    f(client, ecdsa_384_aes128_cbc,    ciphercmd("aes128-cbc"),    setup_ecdsa_384,  teardown) \
+    f(client, ecdsa_384_aes256_cbc,    ciphercmd("aes256-cbc"),    setup_ecdsa_384,  teardown) \
+    f(client, ecdsa_521_aes128_cbc,    ciphercmd("aes128-cbc"),    setup_ecdsa_521,  teardown) \
+    f(client, ecdsa_521_aes256_cbc,    ciphercmd("aes256-cbc"),    setup_ecdsa_521,  teardown)
+
 #ifdef HAVE_DSA
 #define PKDTESTS_CIPHER(f, client, ciphercmd) \
     /* Ciphers. */ \
-    PKDTESTS_CIPHER_FIPS(f, client, ciphercmd) \
-    f(client, rsa_3des_cbc,            ciphercmd("3des-cbc"),      setup_rsa,        teardown) \
-    f(client, dsa_3des_cbc,            ciphercmd("3des-cbc"),      setup_dsa,        teardown) \
-    f(client, dsa_aes128_cbc,          ciphercmd("aes128-cbc"),    setup_dsa,        teardown) \
+    PKDTESTS_CIPHER_COMMON(f, client, ciphercmd) \
     f(client, dsa_aes128_ctr,          ciphercmd("aes128-ctr"),    setup_dsa,        teardown) \
-    f(client, dsa_aes256_cbc,          ciphercmd("aes256-cbc"),    setup_dsa,        teardown) \
-    f(client, dsa_aes256_ctr,          ciphercmd("aes256-ctr"),    setup_dsa,        teardown) \
-    f(client, ecdsa_256_3des_cbc,      ciphercmd("3des-cbc"),      setup_ecdsa_256,  teardown) \
-    f(client, ecdsa_384_3des_cbc,      ciphercmd("3des-cbc"),      setup_ecdsa_384,  teardown) \
-    f(client, ecdsa_521_3des_cbc,      ciphercmd("3des-cbc"),      setup_ecdsa_521,  teardown)
+    f(client, dsa_aes256_ctr,          ciphercmd("aes256-ctr"),    setup_dsa,        teardown)
 #else
 #define PKDTESTS_CIPHER(f, client, ciphercmd) \
     /* Ciphers. */ \
-    PKDTESTS_CIPHER_FIPS(f, client, ciphercmd) \
-    f(client, rsa_3des_cbc,            ciphercmd("3des-cbc"),      setup_rsa,        teardown) \
-    f(client, ecdsa_256_3des_cbc,      ciphercmd("3des-cbc"),      setup_ecdsa_256,  teardown) \
-    f(client, ecdsa_384_3des_cbc,      ciphercmd("3des-cbc"),      setup_ecdsa_384,  teardown) \
-    f(client, ecdsa_521_3des_cbc,      ciphercmd("3des-cbc"),      setup_ecdsa_521,  teardown)
+    PKDTESTS_CIPHER_COMMON(f, client, ciphercmd)
 #endif
 
 #define CHACHA20 "chacha20-poly1305@openssh.com"
@@ -451,10 +443,16 @@ static int torture_pkd_setup_ecdsa_521(void **state) {
 #define PKDTESTS_CIPHER_OPENSSHONLY(f, client, ciphercmd) \
     /* Ciphers. */ \
     PKDTESTS_CIPHER_OPENSSHONLY_FIPS(f, client, ciphercmd) \
+    f(client, rsa_3des_cbc,            ciphercmd("3des-cbc"),      setup_rsa,        teardown) \
+    f(client, rsa_aes128_cbc,          ciphercmd("aes128-cbc"),    setup_rsa,        teardown) \
     f(client, rsa_aes192_cbc,          ciphercmd("aes192-cbc"),    setup_rsa,        teardown) \
+    f(client, rsa_aes256_cbc,          ciphercmd("aes256-cbc"),    setup_rsa,        teardown) \
     f(client, rsa_aes192_ctr,          ciphercmd("aes192-ctr"),    setup_rsa,        teardown) \
     f(client, rsa_chacha20,            ciphercmd(CHACHA20),        setup_rsa,        teardown) \
+    f(client, dsa_3des_cbc,            ciphercmd("3des-cbc"),      setup_dsa,        teardown) \
+    f(client, dsa_aes128_cbc,          ciphercmd("aes128-cbc"),    setup_dsa,        teardown) \
     f(client, dsa_aes192_cbc,          ciphercmd("aes192-cbc"),    setup_dsa,        teardown) \
+    f(client, dsa_aes256_cbc,          ciphercmd("aes256-cbc"),    setup_dsa,        teardown) \
     f(client, dsa_aes192_ctr,          ciphercmd("aes192-ctr"),    setup_dsa,        teardown) \
     f(client, dsa_chacha20,            ciphercmd(CHACHA20),        setup_dsa,        teardown) \
     f(client, dsa_aes128_gcm,          ciphercmd(AES128_GCM),      setup_dsa,        teardown) \
@@ -469,20 +467,32 @@ static int torture_pkd_setup_ecdsa_521(void **state) {
     f(client, ed25519_chacha20,        ciphercmd(CHACHA20),        setup_ed25519,    teardown) \
     f(client, ed25519_aes128_gcm,      ciphercmd(AES128_GCM),      setup_ed25519,    teardown) \
     f(client, ed25519_aes256_gcm,      ciphercmd(AES256_GCM),      setup_ed25519,    teardown) \
+    f(client, ecdsa_256_3des_cbc,      ciphercmd("3des-cbc"),      setup_ecdsa_256,  teardown) \
+    f(client, ecdsa_256_aes128_cbc,    ciphercmd("aes128-cbc"),    setup_ecdsa_256,  teardown) \
     f(client, ecdsa_256_aes192_cbc,    ciphercmd("aes192-cbc"),    setup_ecdsa_256,  teardown) \
+    f(client, ecdsa_256_aes256_cbc,    ciphercmd("aes256-cbc"),    setup_ecdsa_256,  teardown) \
     f(client, ecdsa_256_aes192_ctr,    ciphercmd("aes192-ctr"),    setup_ecdsa_256,  teardown) \
     f(client, ecdsa_256_chacha20,      ciphercmd(CHACHA20),        setup_ecdsa_256,  teardown) \
+    f(client, ecdsa_384_3des_cbc,      ciphercmd("3des-cbc"),      setup_ecdsa_384,  teardown) \
+    f(client, ecdsa_384_aes128_cbc,    ciphercmd("aes128-cbc"),    setup_ecdsa_384,  teardown) \
     f(client, ecdsa_384_aes192_cbc,    ciphercmd("aes192-cbc"),    setup_ecdsa_384,  teardown) \
+    f(client, ecdsa_384_aes256_cbc,    ciphercmd("aes256-cbc"),    setup_ecdsa_384,  teardown) \
     f(client, ecdsa_384_aes192_ctr,    ciphercmd("aes192-ctr"),    setup_ecdsa_384,  teardown) \
     f(client, ecdsa_384_chacha20,      ciphercmd(CHACHA20),        setup_ecdsa_384,  teardown) \
+    f(client, ecdsa_521_3des_cbc,      ciphercmd("3des-cbc"),      setup_ecdsa_521,  teardown) \
+    f(client, ecdsa_521_aes128_cbc,    ciphercmd("aes128-cbc"),    setup_ecdsa_521,  teardown) \
     f(client, ecdsa_521_aes192_cbc,    ciphercmd("aes192-cbc"),    setup_ecdsa_521,  teardown) \
+    f(client, ecdsa_521_aes256_cbc,    ciphercmd("aes256-cbc"),    setup_ecdsa_521,  teardown) \
     f(client, ecdsa_521_aes192_ctr,    ciphercmd("aes192-ctr"),    setup_ecdsa_521,  teardown) \
     f(client, ecdsa_521_chacha20,      ciphercmd(CHACHA20),        setup_ecdsa_521,  teardown)
 #else
 #define PKDTESTS_CIPHER_OPENSSHONLY(f, client, ciphercmd) \
     /* Ciphers. */ \
     PKDTESTS_CIPHER_OPENSSHONLY_FIPS(f, client, ciphercmd) \
+    f(client, rsa_3des_cbc,            ciphercmd("3des-cbc"),      setup_rsa,        teardown) \
+    f(client, rsa_aes128_cbc,          ciphercmd("aes128-cbc"),    setup_rsa,        teardown) \
     f(client, rsa_aes192_cbc,          ciphercmd("aes192-cbc"),    setup_rsa,        teardown) \
+    f(client, rsa_aes256_cbc,          ciphercmd("aes256-cbc"),    setup_rsa,        teardown) \
     f(client, rsa_aes192_ctr,          ciphercmd("aes192-ctr"),    setup_rsa,        teardown) \
     f(client, rsa_chacha20,            ciphercmd(CHACHA20),        setup_rsa,        teardown) \
     f(client, ed25519_3des_cbc,        ciphercmd("3des-cbc"),      setup_ed25519,    teardown) \
@@ -493,13 +503,22 @@ static int torture_pkd_setup_ecdsa_521(void **state) {
     f(client, ed25519_aes192_cbc,      ciphercmd("aes192-cbc"),    setup_ed25519,    teardown) \
     f(client, ed25519_aes192_ctr,      ciphercmd("aes192-ctr"),    setup_ed25519,    teardown) \
     f(client, ed25519_chacha20,        ciphercmd(CHACHA20),        setup_ed25519,    teardown) \
+    f(client, ecdsa_256_3des_cbc,      ciphercmd("3des-cbc"),      setup_ecdsa_256,  teardown) \
+    f(client, ecdsa_256_aes128_cbc,    ciphercmd("aes128-cbc"),    setup_ecdsa_256,  teardown) \
     f(client, ecdsa_256_aes192_cbc,    ciphercmd("aes192-cbc"),    setup_ecdsa_256,  teardown) \
+    f(client, ecdsa_256_aes256_cbc,    ciphercmd("aes256-cbc"),    setup_ecdsa_256,  teardown) \
     f(client, ecdsa_256_aes192_ctr,    ciphercmd("aes192-ctr"),    setup_ecdsa_256,  teardown) \
     f(client, ecdsa_256_chacha20,      ciphercmd(CHACHA20),        setup_ecdsa_256,  teardown) \
+    f(client, ecdsa_384_3des_cbc,      ciphercmd("3des-cbc"),      setup_ecdsa_384,  teardown) \
+    f(client, ecdsa_384_aes128_cbc,    ciphercmd("aes128-cbc"),    setup_ecdsa_384,  teardown) \
     f(client, ecdsa_384_aes192_cbc,    ciphercmd("aes192-cbc"),    setup_ecdsa_384,  teardown) \
+    f(client, ecdsa_384_aes256_cbc,    ciphercmd("aes256-cbc"),    setup_ecdsa_384,  teardown) \
     f(client, ecdsa_384_aes192_ctr,    ciphercmd("aes192-ctr"),    setup_ecdsa_384,  teardown) \
     f(client, ecdsa_384_chacha20,      ciphercmd(CHACHA20),        setup_ecdsa_384,  teardown) \
+    f(client, ecdsa_521_3des_cbc,      ciphercmd("3des-cbc"),      setup_ecdsa_521,  teardown) \
+    f(client, ecdsa_521_aes128_cbc,    ciphercmd("aes128-cbc"),    setup_ecdsa_521,  teardown) \
     f(client, ecdsa_521_aes192_cbc,    ciphercmd("aes192-cbc"),    setup_ecdsa_521,  teardown) \
+    f(client, ecdsa_521_aes256_cbc,    ciphercmd("aes256-cbc"),    setup_ecdsa_521,  teardown) \
     f(client, ecdsa_521_aes192_ctr,    ciphercmd("aes192-ctr"),    setup_ecdsa_521,  teardown) \
     f(client, ecdsa_521_chacha20,      ciphercmd(CHACHA20),        setup_ecdsa_521,  teardown)
 #endif

tests/pkd/pkd_keyutil.c

@@ -22,7 +22,7 @@
 #include "pkd_keyutil.h"
 #include "pkd_util.h"
 
-void setup_rsa_key() {
+void setup_rsa_key(void) {
     int rc = 0;
     if (access(LIBSSH_RSA_TESTKEY, F_OK) != 0) {
         rc = system_checked(OPENSSH_KEYGEN " -t rsa -q -N \"\" -f "
@@ -31,7 +31,7 @@ void setup_rsa_key() {
     assert_int_equal(rc, 0);
 }
 
-void setup_ed25519_key() {
+void setup_ed25519_key(void) {
     int rc = 0;
     if (access(LIBSSH_ED25519_TESTKEY, F_OK) != 0) {
         rc = system_checked(OPENSSH_KEYGEN " -t ed25519 -q -N \"\" -f "
@@ -41,7 +41,7 @@ void setup_ed25519_key() {
 }
 
 #ifdef HAVE_DSA
-void setup_dsa_key() {
+void setup_dsa_key(void) {
     int rc = 0;
     if (access(LIBSSH_DSA_TESTKEY, F_OK) != 0) {
         rc = system_checked(OPENSSH_KEYGEN " -t dsa -q -N \"\" -f "
@@ -51,7 +51,7 @@ void setup_dsa_key() {
 }
 #endif
 
-void setup_ecdsa_keys() {
+void setup_ecdsa_keys(void) {
     int rc = 0;
 
     if (access(LIBSSH_ECDSA_256_TESTKEY, F_OK) != 0) {
@@ -71,27 +71,27 @@ void setup_ecdsa_keys() {
     }
 }
 
-void cleanup_rsa_key() {
+void cleanup_rsa_key(void) {
     cleanup_key(LIBSSH_RSA_TESTKEY);
 }
 
-void cleanup_ed25519_key() {
+void cleanup_ed25519_key(void) {
     cleanup_key(LIBSSH_ED25519_TESTKEY);
 }
 
 #ifdef HAVE_DSA
-void cleanup_dsa_key() {
+void cleanup_dsa_key(void) {
     cleanup_key(LIBSSH_DSA_TESTKEY);
 }
 #endif
 
-void cleanup_ecdsa_keys() {
+void cleanup_ecdsa_keys(void) {
     cleanup_key(LIBSSH_ECDSA_256_TESTKEY);
     cleanup_key(LIBSSH_ECDSA_384_TESTKEY);
     cleanup_key(LIBSSH_ECDSA_521_TESTKEY);
 }
 
-void setup_openssh_client_keys() {
+void setup_openssh_client_keys(void) {
     int rc = 0;
 
     if (access(OPENSSH_CA_TESTKEY, F_OK) != 0) {
@@ -184,7 +184,7 @@ void setup_openssh_client_keys() {
     }
 }
 
-void cleanup_openssh_client_keys() {
+void cleanup_openssh_client_keys(void) {
     cleanup_key(OPENSSH_CA_TESTKEY);
     cleanup_key(OPENSSH_RSA_TESTKEY);
     cleanup_file(OPENSSH_RSA_TESTKEY "-sha256-cert.pub");
@@ -199,7 +199,7 @@ void cleanup_openssh_client_keys() {
     }
 }
 
-void setup_dropbear_client_rsa_key() {
+void setup_dropbear_client_rsa_key(void) {
     int rc = 0;
     if (access(DROPBEAR_RSA_TESTKEY, F_OK) != 0) {
         rc = system_checked(DROPBEAR_KEYGEN " -t rsa -f "
@@ -208,6 +208,6 @@ void setup_dropbear_client_rsa_key() {
     assert_int_equal(rc, 0);
 }
 
-void cleanup_dropbear_client_rsa_key() {
+void cleanup_dropbear_client_rsa_key(void) {
     unlink(DROPBEAR_RSA_TESTKEY);
 }

tests/server/torture_server_config.c

@@ -285,9 +285,7 @@ static int stop_server(void **state)
     assert_non_null(s);
 
     rc = torture_terminate_process(s->srv_pidfile);
-    if (rc != 0) {
-        fprintf(stderr, "XXXXXX Failed to terminate sshd\n");
-    }
+    assert_return_code(rc, errno);
 
     unlink(s->srv_pidfile);
 
@@ -513,6 +511,12 @@ static void torture_server_config_ciphers(void **state)
         /* Try each algorithm individually */
         j = 0;
         while(tokens->tokens[j] != NULL) {
+            char *cmp = strstr(OPENSSH_CIPHERS, tokens->tokens[j]);
+            if (cmp == NULL) {
+                /* This cipher is not supported by the OpenSSH. Skip it */
+                j++;
+                continue;
+            }
             snprintf(config_content,
                     sizeof(config_content),
                     "HostKey %s\nCiphers %s\n",

tests/torture.c

@@ -250,8 +250,12 @@ int torture_terminate_process(const char *pidfile)
 
         rc = kill(pid, 0);
         if (rc != 0) {
-            is_running = 0;
-            break;
+            /* Process not found */
+            if (errno == ESRCH) {
+                is_running = 0;
+                rc = 0;
+                break;
+            }
         }
     }
 
@@ -260,7 +264,7 @@ int torture_terminate_process(const char *pidfile)
                 "WARNING: The process with pid %u is still running!\n", pid);
     }
 
-    return 0;
+    return rc;
 }
 
 ssh_session torture_ssh_session(struct torture_state *s,
@@ -421,7 +425,8 @@ ssh_bind torture_ssh_bind(const char *addr,
 
 #ifdef WITH_SFTP
 
-struct torture_sftp *torture_sftp_session(ssh_session session) {
+struct torture_sftp *torture_sftp_session_channel(ssh_session session, ssh_channel channel)
+{
     struct torture_sftp *t;
     char template[] = "/tmp/ssh_torture_XXXXXX";
     char *p;
@@ -437,9 +442,26 @@ struct torture_sftp *torture_sftp_session(ssh_session session) {
     }
 
     t->ssh = session;
-    t->sftp = sftp_new(session);
-    if (t->sftp == NULL) {
-        goto failed;
+    if (channel == NULL) {
+        t->sftp = sftp_new(session);
+        if (t->sftp == NULL) {
+            goto failed;
+        }
+    } else {
+        t->sftp = sftp_new_channel(session, channel);
+        if (t->sftp == NULL) {
+            goto failed;
+        }
+
+        rc = ssh_channel_open_session(channel);
+        if (rc != SSH_OK) {
+            goto failed;
+        }
+
+        rc = ssh_channel_request_sftp(channel);
+        if (rc != SSH_OK) {
+            goto failed;
+        }
     }
 
     rc = sftp_init(t->sftp);
@@ -470,6 +492,11 @@ failed:
     return NULL;
 }
 
+struct torture_sftp *torture_sftp_session(ssh_session session)
+{
+    return torture_sftp_session_channel(session, NULL);
+}
+
 void torture_sftp_close(struct torture_sftp *t) {
     if (t == NULL) {
         return;
@@ -629,7 +656,8 @@ static void torture_setup_create_sshd_config(void **state, bool pam)
              "\n"
              "StrictModes no\n"
              "\n"
-             "%s" /* Here comes UsePam */
+             "%s\n" /* Here comes UsePam */
+             "%s" /* The space for test-specific options */
              "\n"
              /* add all supported algorithms */
              "HostKeyAlgorithms " OPENSSH_KEYS "\n"
@@ -644,8 +672,7 @@ static void torture_setup_create_sshd_config(void **state, bool pam)
              "AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT\n"
              "AcceptEnv LC_IDENTIFICATION LC_ALL LC_LIBSSH\n"
              "\n"
-             "PidFile %s\n"
-             "%s\n"; /* The space for test-specific options */
+             "PidFile %s\n";
     /* FIPS config */
     const char fips_config_string[]=
              "Port 22\n"
@@ -663,7 +690,8 @@ static void torture_setup_create_sshd_config(void **state, bool pam)
              "\n"
              "StrictModes no\n"
              "\n"
-             "%s" /* UsePam */
+             "%s\n" /* Here comes UsePam */
+             "%s" /* The space for test-specific options */
              "\n"
              "Ciphers "
                 "aes256-gcm@openssh.com,aes256-ctr,aes256-cbc,"
@@ -692,8 +720,7 @@ static void torture_setup_create_sshd_config(void **state, bool pam)
              "AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT\n"
              "AcceptEnv LC_IDENTIFICATION LC_ALL LC_LIBSSH\n"
              "\n"
-             "PidFile %s\n" /* PID file */
-             "%s\n"; /* The space for test-specific options */
+             "PidFile %s\n"; /* PID file */
     const char usepam_yes[] =
              "UsePAM yes\n"
              "KbdInteractiveAuthentication yes\n";
@@ -794,8 +821,8 @@ static void torture_setup_create_sshd_config(void **state, bool pam)
                 trusted_ca_pubkey,
                 sftp_server,
                 usepam,
-                s->srv_pidfile,
-                additional_config);
+                additional_config,
+                s->srv_pidfile);
     } else {
         snprintf(sshd_config, sizeof(sshd_config),
                 config_string,
@@ -808,8 +835,8 @@ static void torture_setup_create_sshd_config(void **state, bool pam)
                 trusted_ca_pubkey,
                 sftp_server,
                 usepam,
-                s->srv_pidfile,
-                additional_config);
+                additional_config,
+                s->srv_pidfile);
     }
 
     torture_write_file(s->srv_config, sshd_config);
@@ -833,21 +860,16 @@ static int torture_wait_for_daemon(unsigned int seconds)
     return 1;
 }
 
-void torture_setup_sshd_server(void **state, bool pam)
+static int torture_start_sshd_server(void **state)
 {
-    struct torture_state *s;
+    struct torture_state *s = *state;
     char sshd_start_cmd[1024];
     int rc;
 
-    torture_setup_socket_dir(state);
-    torture_setup_create_sshd_config(state, pam);
-
     /* Set the default interface for the server */
     setenv("SOCKET_WRAPPER_DEFAULT_IFACE", "10", 1);
     setenv("PAM_WRAPPER", "1", 1);
 
-    s = *state;
-
     snprintf(sshd_start_cmd, sizeof(sshd_start_cmd),
              SSHD_EXECUTABLE " -r -f %s -E %s/sshd/daemon.log 2> %s/sshd/cwrap.log",
              s->srv_config, s->socket_dir, s->socket_dir);
@@ -859,7 +881,20 @@ void torture_setup_sshd_server(void **state, bool pam)
     unsetenv("PAM_WRAPPER");
 
     /* Wait until the sshd is ready to accept connections */
-    rc = torture_wait_for_daemon(5);
+    rc = torture_wait_for_daemon(15);
+    assert_int_equal(rc, 0);
+
+    return SSH_OK;
+}
+
+void torture_setup_sshd_server(void **state, bool pam)
+{
+    int rc;
+
+    torture_setup_socket_dir(state);
+    torture_setup_create_sshd_config(state, pam);
+
+    rc = torture_start_sshd_server(state);
     assert_int_equal(rc, 0);
 }
 
@@ -899,29 +934,12 @@ static int
 torture_reload_sshd_server(void **state)
 {
     struct torture_state *s = *state;
-    pid_t pid;
     int rc;
 
-    /* read the pidfile */
-    pid = torture_read_pidfile(s->srv_pidfile);
-    assert_int_not_equal(pid, -1);
+    rc = torture_terminate_process(s->srv_pidfile);
+    assert_return_code(rc, errno);
 
-    kill(pid, SIGHUP);
-
-    /* 10 ms */
-    usleep(10 * 1000);
-
-    rc = kill(pid, 0);
-    if (rc != 0) {
-        fprintf(stderr,
-                "ERROR: SSHD process %u died during reload!\n", pid);
-        return SSH_ERROR;
-    }
-
-    /* Wait until the sshd is ready to accept connections */
-    rc = torture_wait_for_daemon(5);
-    assert_int_equal(rc, 0);
-    return SSH_OK;
+    return torture_start_sshd_server(state);
 }
 
 /* @brief: Updates SSHD server configuration with more options and
@@ -957,9 +975,7 @@ void torture_teardown_sshd_server(void **state)
     int rc;
 
     rc = torture_terminate_process(s->srv_pidfile);
-    if (rc != 0) {
-        fprintf(stderr, "XXXXXX Failed to terminate sshd\n");
-    }
+    assert_return_code(rc, errno);
 
     torture_teardown_socket_dir(state);
 }

tests/torture.h

@@ -111,6 +111,7 @@ ssh_bind torture_ssh_bind(const char *addr,
                           const char *private_key_file);
 
 struct torture_sftp *torture_sftp_session(ssh_session session);
+struct torture_sftp *torture_sftp_session_channel(ssh_session session, ssh_channel channel);
 void torture_sftp_close(struct torture_sftp *t);
 
 void torture_write_file(const char *filename, const char *data);

tests/unittests/torture_callbacks.c

@@ -138,6 +138,9 @@ static void torture_callbacks_execute_list(void **state){
     };
 
     (void)state;
+
+    assert_non_null(list);
+
     ssh_callbacks_init(&c1);
     ssh_callbacks_init(&c2);
     ssh_callbacks_init(&c3);
@@ -213,6 +216,8 @@ static void torture_callbacks_iterate(void **state){
 
     (void)state; /* unused */
 
+    assert_non_null(list);
+
     ssh_callbacks_init(&c1);
     ssh_callbacks_init(&c2);
 

tests/unittests/torture_misc.c

@@ -209,7 +209,8 @@ static void torture_timeout_elapsed(void **state){
     struct ssh_timestamp ts;
     (void) state;
     ssh_timestamp_init(&ts);
-    usleep(50000);
+    usleep(30000);
+
     assert_true(ssh_timeout_elapsed(&ts,25));
     assert_false(ssh_timeout_elapsed(&ts,30000));
     assert_false(ssh_timeout_elapsed(&ts,75));

tests/unittests/torture_packet_filter.c

@@ -517,12 +517,108 @@ static void torture_packet_filter_check_channel_open(void **state)
     assert_int_equal(rc, 0);
 }
 
+static void torture_packet_filter_check_channel_success(void **state)
+{
+    int rc;
+
+    /* The only condition to accept a CHANNEL_SUCCESS is to be authenticated */
+    global_state accepted[] = {
+        {
+            .flags = COMPARE_SESSION_STATE,
+            .session = SSH_SESSION_STATE_AUTHENTICATED,
+        }
+    };
+
+    int accepted_count = 1;
+
+    /* Unused */
+    (void) state;
+
+    rc = check_message_in_all_states(accepted, accepted_count,
+            SSH2_MSG_CHANNEL_SUCCESS);
+
+    assert_int_equal(rc, 0);
+}
+
+static void torture_packet_filter_check_channel_failure(void **state)
+{
+    int rc;
+
+    /* The only condition to accept a CHANNEL_FAILURE is to be authenticated */
+    global_state accepted[] = {
+        {
+            .flags = COMPARE_SESSION_STATE,
+            .session = SSH_SESSION_STATE_AUTHENTICATED,
+        }
+    };
+
+    int accepted_count = 1;
+
+    /* Unused */
+    (void) state;
+
+    rc = check_message_in_all_states(accepted, accepted_count,
+            SSH2_MSG_CHANNEL_FAILURE);
+
+    assert_int_equal(rc, 0);
+}
+
+static void torture_packet_filter_check_request_success(void **state)
+{
+    int rc;
+
+    /* The only condition to accept a REQUEST_SUCCESS is to be authenticated */
+    global_state accepted[] = {
+        {
+            .flags = COMPARE_SESSION_STATE,
+            .session = SSH_SESSION_STATE_AUTHENTICATED,
+        }
+    };
+
+    int accepted_count = 1;
+
+    /* Unused */
+    (void) state;
+
+    rc = check_message_in_all_states(accepted, accepted_count,
+            SSH2_MSG_REQUEST_SUCCESS);
+
+    assert_int_equal(rc, 0);
+}
+
+static void torture_packet_filter_check_request_failure(void **state)
+{
+    int rc;
+
+    /* The only condition to accept a REQUEST_FAILURE is to be authenticated */
+    global_state accepted[] = {
+        {
+            .flags = COMPARE_SESSION_STATE,
+            .session = SSH_SESSION_STATE_AUTHENTICATED,
+        }
+    };
+
+    int accepted_count = 1;
+
+    /* Unused */
+    (void) state;
+
+    rc = check_message_in_all_states(accepted, accepted_count,
+            SSH2_MSG_REQUEST_FAILURE);
+
+    assert_int_equal(rc, 0);
+}
+
 int torture_run_tests(void)
 {
     int rc;
     struct CMUnitTest tests[] = {
         cmocka_unit_test(torture_packet_filter_check_auth_success),
         cmocka_unit_test(torture_packet_filter_check_channel_open),
+        cmocka_unit_test(torture_packet_filter_check_channel_success),
+        cmocka_unit_test(torture_packet_filter_check_channel_failure),
+        cmocka_unit_test(torture_packet_filter_check_request_success),
+        cmocka_unit_test(torture_packet_filter_check_request_failure),
         cmocka_unit_test(torture_packet_filter_check_unfiltered),
         cmocka_unit_test(torture_packet_filter_check_msg_ext_info)
     };

tests/unittests/torture_pki_ed25519.c

@@ -796,7 +796,8 @@ static void torture_pki_ed25519_verify(void **state){
     assert_true(rc == SSH_OK);
     assert_non_null(pubkey);
 
-    ssh_string_fill(blob, ref_signature, ED25519_SIG_LEN);
+    rc = ssh_string_fill(blob, ref_signature, ED25519_SIG_LEN);
+    assert_int_equal(rc, 0);
     sig = pki_signature_from_blob(pubkey, blob, SSH_KEYTYPE_ED25519, SSH_DIGEST_AUTO);
     assert_non_null(sig);
 
@@ -853,7 +854,8 @@ static void torture_pki_ed25519_verify_bad(void **state){
     /* alter signature and expect false result */
 
     for (i=0; i < ED25519_SIG_LEN; ++i){
-        ssh_string_fill(blob, ref_signature, ED25519_SIG_LEN);
+        rc = ssh_string_fill(blob, ref_signature, ED25519_SIG_LEN);
+        assert_int_equal(rc, 0);
         ((uint8_t *)ssh_string_data(blob))[i] ^= 0xff;
         sig = pki_signature_from_blob(pubkey, blob, SSH_KEYTYPE_ED25519, SSH_DIGEST_AUTO);
         assert_non_null(sig);

tests/unittests/torture_session_keys.c

@@ -48,8 +48,9 @@ struct ssh_cipher_struct fake_out_cipher = {
 };
 
 struct ssh_crypto_struct test_crypto = {
-    .digest_len = 32,
+    .session_id_len = 32,
     .session_id = secret,
+    .digest_len = 32,
     .secret_hash = secret,
     .in_cipher = &fake_in_cipher,
     .out_cipher = &fake_out_cipher,
@@ -68,7 +69,9 @@ static void torture_session_keys(UNUSED_PARAM(void **state))
     int rc;
 
     k_string = ssh_string_new(32);
-    ssh_string_fill(k_string, key, 32);
+    rc = ssh_string_fill(k_string, key, 32);
+    assert_int_equal(rc, 0);
+
     test_crypto.shared_secret = ssh_make_string_bn(k_string);
 
     rc = ssh_generate_session_keys(&session);