Update ChangeLog.

After discussion with Aris and it was not obvious enough to understand
the issue we decided to refactor it.

Reviewd-by: Aris Adamantiadis <aris@0xbadc0de.be>

CMakeLists.txt

@@ -8,7 +8,7 @@ set(APPLICATION_NAME ${PROJECT_NAME})
 
 set(APPLICATION_VERSION_MAJOR "0")
 set(APPLICATION_VERSION_MINOR "6")
-set(APPLICATION_VERSION_PATCH "0")
+set(APPLICATION_VERSION_PATCH "1")
 
 set(APPLICATION_VERSION "${APPLICATION_VERSION_MAJOR}.${APPLICATION_VERSION_MINOR}.${APPLICATION_VERSION_PATCH}")
 
@@ -19,7 +19,7 @@ set(APPLICATION_VERSION "${APPLICATION_VERSION_MAJOR}.${APPLICATION_VERSION_MINO
 #     Increment AGE. Set REVISION to 0
 #   If the source code was changed, but there were no interface changes:
 #     Increment REVISION.
-set(LIBRARY_VERSION "4.3.0")
+set(LIBRARY_VERSION "4.4.0")
 set(LIBRARY_SOVERSION "4")
 
 # where to look first for cmake modules, before ${CMAKE_ROOT}/Modules/ is checked

CPackConfig.cmake

@@ -19,7 +19,7 @@ set(CPACK_PACKAGE_VERSION "${CPACK_PACKAGE_VERSION_MAJOR}.${CPACK_PACKAGE_VERSIO
 
 ### source generator
 set(CPACK_SOURCE_GENERATOR "TGZ")
-set(CPACK_SOURCE_IGNORE_FILES "~$;[.]swp$;/[.]svn/;/[.]git/;.gitignore;/build/;tags;cscope.*")
+set(CPACK_SOURCE_IGNORE_FILES "~$;[.]swp$;/[.]svn/;/[.]git/;.gitignore;/build/;/obj/;tags;cscope.*")
 set(CPACK_SOURCE_PACKAGE_FILE_NAME "${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}")
 
 if (WIN32)

ChangeLog

@@ -1,6 +1,18 @@
 ChangeLog
 ==========
 
+version 0.6.1 (released 2014-02-08)
+  * Added support for libgcrypt 1.6.
+  * Added ssh_channel_accept_forward().
+  * Added known_hosts heuristic during connection (#138).
+  * Added getters for session cipher names.
+  * Fixed decrypt of zero length buffer.
+  * Fixed padding in RSA signature blobs.
+  * Fixed DSA signature extraction.
+  * Fixed some memory leaks.
+  * Fixed read of non-connected socket.
+  * Fixed thread dectection.
+
 version 0.6.0 (released 2014-01-08)
   * Added new publicy key API.
   * Added new userauth API.

ConfigureChecks.cmake

@@ -169,11 +169,9 @@ if (GCRYPT_FOUND)
     endif (GCRYPT_VERSION VERSION_GREATER "1.4.6")
 endif (GCRYPT_FOUND)
 
-if (CMAKE_HAVE_THREADS_LIBRARY)
-    if (CMAKE_USE_PTHREADS_INIT)
-        set(HAVE_PTHREAD 1)
-    endif (CMAKE_USE_PTHREADS_INIT)
-endif (CMAKE_HAVE_THREADS_LIBRARY)
+if (CMAKE_USE_PTHREADS_INIT)
+    set(HAVE_PTHREAD 1)
+endif (CMAKE_USE_PTHREADS_INIT)
 
 # OPTIONS
 check_c_source_compiles("

cmake/Modules/DefineCompilerFlags.cmake

@@ -75,3 +75,10 @@ if (MSVC)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /D _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES_COUNT=1")
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /D _CRT_NONSTDC_NO_WARNINGS=1 /D _CRT_SECURE_NO_WARNINGS=1")
 endif (MSVC)
+
+# This removes this annoying warning
+# "warning: 'BN_CTX_free' is deprecated: first deprecated in OS X 10.7 [-Wdeprecated-declarations]"
+if (OSX)
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-deprecated-declarations")
+endif (OSX)
+

doc/forwarding.dox

@@ -145,7 +145,7 @@ or whatever use you have for it.
 @subsection libssh_reverse Doing reverse port forwarding with libssh
 
 To do reverse port forwarding, call ssh_forward_listen(),
-then ssh_forward_accept().
+then ssh_channel_accept_forward().
 
 When you call ssh_forward_listen(), you can let the remote server
 chose the non-priviledged port it should listen to. Otherwise, you can chose
@@ -164,6 +164,7 @@ int web_server(ssh_session session)
   ssh_channel channel;
   char buffer[256];
   int nbytes, nwritten;
+  int port;
   char *helloworld = ""
 "HTTP/1.1 200 OK\n"
 "Content-Type: text/html\n"
@@ -186,7 +187,7 @@ int web_server(ssh_session session)
     return rc;
   }
 
-  channel = ssh_forward_accept(session, 60000);
+  channel = ssh_channel_accept_forward(session, 60000, &port);
   if (channel == NULL)
   {
     fprintf(stderr, "Error waiting for incoming connection: %s\n",

doc/threading.dox

@@ -61,5 +61,6 @@ implement the following methods :
 - mutex_destroy
 - thread_id
 
+libgcrypt 1.6 and bigger backend does not support custom callback. Using anything else than pthreads (ssh_threads_get_pthread()) here will fail.
 Good luck !
 */

include/libssh/callbacks.h

@@ -495,6 +495,8 @@ LIBSSH_API int ssh_set_callbacks(ssh_session session, ssh_callbacks cb);
  * @param len the length of the data
  * @param is_stderr is 0 for stdout or 1 for stderr
  * @param userdata Userdata to be passed to the callback function.
+ * @returns number of bytes processed by the callee. The remaining bytes will
+ * be sent in the next callback message, when more data is available.
  */
 typedef int (*ssh_channel_data_callback) (ssh_session session,
                                            ssh_channel channel,
@@ -801,6 +803,8 @@ struct ssh_threads_callbacks_struct {
  *
  * @see ssh_threads_callbacks_struct
  * @see SSH_THREADS_PTHREAD
+ * @bug libgcrypt 1.6 and bigger backend does not support custom callback.
+ *      Using anything else than pthreads here will fail.
  */
 LIBSSH_API int ssh_threads_set_callbacks(struct ssh_threads_callbacks_struct
     *cb);

include/libssh/knownhosts.h

@@ -0,0 +1,27 @@
+/*
+ * This file is part of the SSH Library
+ *
+ * Copyright (c) 20014 by Aris Adamantiadis <aris@badcode.be>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+#ifndef KNOWNHOSTS_H_
+#define KNOWNHOSTS_H_
+
+char **ssh_knownhosts_algorithms(ssh_session session);
+
+#endif /* KNOWNHOSTS_H_ */

include/libssh/libssh.h

@@ -78,7 +78,7 @@
 /* libssh version */
 #define LIBSSH_VERSION_MAJOR  0
 #define LIBSSH_VERSION_MINOR  6
-#define LIBSSH_VERSION_MICRO  0
+#define LIBSSH_VERSION_MICRO  1
 
 #define LIBSSH_VERSION_INT SSH_VERSION_INT(LIBSSH_VERSION_MAJOR, \
                                            LIBSSH_VERSION_MINOR, \
@@ -377,7 +377,7 @@ LIBSSH_API int ssh_channel_open_x11(ssh_channel channel, const char *orig_addr,
 LIBSSH_API int ssh_channel_poll(ssh_channel channel, int is_stderr);
 LIBSSH_API int ssh_channel_poll_timeout(ssh_channel channel, int timeout, int is_stderr);
 LIBSSH_API int ssh_channel_read(ssh_channel channel, void *dest, uint32_t count, int is_stderr);
-LIBSSH_API int ssh_channel_read_timeout(ssh_channel channel, void *dest, uint32_t count, int is_stderr, int timeout);
+LIBSSH_API int ssh_channel_read_timeout(ssh_channel channel, void *dest, uint32_t count, int is_stderr, int timeout_ms);
 LIBSSH_API int ssh_channel_read_nonblocking(ssh_channel channel, void *dest, uint32_t count,
     int is_stderr);
 LIBSSH_API int ssh_channel_request_env(ssh_channel channel, const char *name, const char *value);
@@ -406,6 +406,7 @@ LIBSSH_API void ssh_disconnect(ssh_session session);
 LIBSSH_API char *ssh_dirname (const char *path);
 LIBSSH_API int ssh_finalize(void);
 LIBSSH_API ssh_channel ssh_forward_accept(ssh_session session, int timeout_ms);
+LIBSSH_API ssh_channel ssh_channel_accept_forward(ssh_session session, int timeout_ms, int *destination_port);
 LIBSSH_API int ssh_forward_cancel(ssh_session session, const char *address, int port);
 LIBSSH_API int ssh_forward_listen(ssh_session session, const char *address, int port, int *bound_port);
 LIBSSH_API void ssh_free(ssh_session session);
@@ -627,6 +628,8 @@ LIBSSH_API int ssh_event_remove_session(ssh_event event, ssh_session session);
 LIBSSH_API void ssh_event_free(ssh_event event);
 LIBSSH_API const char* ssh_get_clientbanner(ssh_session session);
 LIBSSH_API const char* ssh_get_serverbanner(ssh_session session);
+LIBSSH_API const char* ssh_get_cipher_in(ssh_session session);
+LIBSSH_API const char* ssh_get_cipher_out(ssh_session session);
 
 #ifndef LIBSSH_LEGACY_0_4
 #include "libssh/legacy.h"

include/libssh/priv.h

@@ -120,11 +120,24 @@ int gettimeofday(struct timeval *__p, void *__t);
 #include "libssh/callbacks.h"
 
 /* some constants */
+#ifndef MAX_PACKAT_LEN
 #define MAX_PACKET_LEN 262144
+#endif
+#ifndef ERROR_BUFFERLEN
 #define ERROR_BUFFERLEN 1024
+#endif
+#ifndef CLIENTBANNER1
 #define CLIENTBANNER1 "SSH-1.5-libssh-" SSH_STRINGIFY(LIBSSH_VERSION)
+#endif
+#ifndef CLIENTBANNER2
 #define CLIENTBANNER2 "SSH-2.0-libssh-" SSH_STRINGIFY(LIBSSH_VERSION)
+#endif
+#ifndef KBDINT_MAX_PROMPT
 #define KBDINT_MAX_PROMPT 256 /* more than openssh's :) */
+#endif
+#ifndef MAX_BUF_SIZE
+#define MAX_BUF_SIZE 4096
+#endif
 
 #ifndef __FUNCTION__
 #if defined(__SUNPRO_C)
@@ -155,16 +168,6 @@ int gettimeofday(struct timeval *__p, void *__t);
 #include <sys/time.h>
 #endif
 
-/*
- * get rid of deprecacy warnings on OSX when using OpenSSL 
- */
-#if defined(__APPLE__)
-    #ifdef MAC_OS_X_VERSION_MIN_REQUIRED
-        #undef MAC_OS_X_VERSION_MIN_REQUIRED
-    #endif
-    #define MAC_OS_X_VERSION_MIN_REQUIRED MAC_OS_X_VERSION_10_6
-#endif
-
 /* forward declarations */
 struct ssh_common_struct;
 struct ssh_kex_struct;

include/libssh/session.h

@@ -175,6 +175,7 @@ struct ssh_session_struct {
         char *knownhosts;
         char *wanted_methods[10];
         char *ProxyCommand;
+        char *custombanner;
         unsigned long timeout; /* seconds */
         unsigned long timeout_usec;
         unsigned int port;

src/CMakeLists.txt

@@ -288,6 +288,6 @@ if (WITH_STATIC_LIB)
   )
 endif (WITH_STATIC_LIB)
 
-if (CMAKE_HAVE_THREADS_LIBRARY)
+if (Threads_FOUND)
     add_subdirectory(threads)
-endif (CMAKE_HAVE_THREADS_LIBRARY)
+endif (Threads_FOUND)

src/bind.c

@@ -144,26 +144,19 @@ ssh_bind ssh_bind_new(void) {
   return ptr;
 }
 
-int ssh_bind_listen(ssh_bind sshbind) {
-  const char *host;
-  socket_t fd;
+static int ssh_bind_import_keys(ssh_bind sshbind) {
   int rc;
 
-  if (ssh_init() < 0) {
-    ssh_set_error(sshbind, SSH_FATAL, "ssh_init() failed");
-    return -1;
-  }
-
   if (sshbind->ecdsakey == NULL &&
       sshbind->dsakey == NULL &&
       sshbind->rsakey == NULL) {
       ssh_set_error(sshbind, SSH_FATAL,
-              "DSA or RSA host key file must be set before listen()");
+                    "ECDSA, DSA, or RSA host key file must be set");
       return SSH_ERROR;
   }
 
 #ifdef HAVE_ECC
-  if (sshbind->ecdsakey) {
+  if (sshbind->ecdsa == NULL && sshbind->ecdsakey != NULL) {
       rc = ssh_pki_import_privkey_file(sshbind->ecdsakey,
                                        NULL,
                                        NULL,
@@ -179,12 +172,13 @@ int ssh_bind_listen(ssh_bind sshbind) {
           ssh_set_error(sshbind, SSH_FATAL,
                   "The ECDSA host key has the wrong type");
           ssh_key_free(sshbind->ecdsa);
+          sshbind->ecdsa = NULL;
           return SSH_ERROR;
       }
   }
 #endif
 
-  if (sshbind->dsakey) {
+  if (sshbind->dsa == NULL && sshbind->dsakey != NULL) {
       rc = ssh_pki_import_privkey_file(sshbind->dsakey,
                                        NULL,
                                        NULL,
@@ -201,11 +195,12 @@ int ssh_bind_listen(ssh_bind sshbind) {
                   "The DSA host key has the wrong type: %d",
                   ssh_key_type(sshbind->dsa));
           ssh_key_free(sshbind->dsa);
+          sshbind->dsa = NULL;
           return SSH_ERROR;
       }
   }
 
-  if (sshbind->rsakey) {
+  if (sshbind->rsa == NULL && sshbind->rsakey != NULL) {
       rc = ssh_pki_import_privkey_file(sshbind->rsakey,
                                        NULL,
                                        NULL,
@@ -222,10 +217,29 @@ int ssh_bind_listen(ssh_bind sshbind) {
           ssh_set_error(sshbind, SSH_FATAL,
                   "The RSA host key has the wrong type");
           ssh_key_free(sshbind->rsa);
+          sshbind->rsa = NULL;
           return SSH_ERROR;
       }
   }
 
+  return SSH_OK;
+}
+
+int ssh_bind_listen(ssh_bind sshbind) {
+  const char *host;
+  socket_t fd;
+  int rc;
+
+  if (ssh_init() < 0) {
+    ssh_set_error(sshbind, SSH_FATAL, "ssh_init() failed");
+    return -1;
+  }
+
+  rc = ssh_bind_import_keys(sshbind);
+  if (rc != SSH_OK) {
+    return SSH_ERROR;
+  }
+
   if (sshbind->bindfd == SSH_INVALID_SOCKET) {
       host = sshbind->bindaddr;
       if (host == NULL) {
@@ -235,7 +249,9 @@ int ssh_bind_listen(ssh_bind sshbind) {
       fd = bind_socket(sshbind, host, sshbind->bindport);
       if (fd == SSH_INVALID_SOCKET) {
           ssh_key_free(sshbind->dsa);
+          sshbind->dsa = NULL;
           ssh_key_free(sshbind->rsa);
+          sshbind->rsa = NULL;
           return -1;
       }
       sshbind->bindfd = fd;
@@ -246,7 +262,9 @@ int ssh_bind_listen(ssh_bind sshbind) {
                   fd, strerror(errno));
           close(fd);
           ssh_key_free(sshbind->dsa);
+          sshbind->dsa = NULL;
           ssh_key_free(sshbind->rsa);
+          sshbind->rsa = NULL;
           return -1;
       }
   } else {
@@ -348,8 +366,11 @@ void ssh_bind_free(ssh_bind sshbind){
   SAFE_FREE(sshbind->ecdsakey);
 
   ssh_key_free(sshbind->dsa);
+  sshbind->dsa = NULL;
   ssh_key_free(sshbind->rsa);
+  sshbind->rsa = NULL;
   ssh_key_free(sshbind->ecdsa);
+  sshbind->ecdsa = NULL;
 
   for (i = 0; i < 10; i++) {
     if (sshbind->wanted_methods[i]) {
@@ -361,7 +382,7 @@ void ssh_bind_free(ssh_bind sshbind){
 }
 
 int ssh_bind_accept_fd(ssh_bind sshbind, ssh_session session, socket_t fd){
-    int i;
+    int i, rc;
 
     if (session == NULL){
         ssh_set_error(sshbind, SSH_FATAL,"session is null");
@@ -392,7 +413,8 @@ int ssh_bind_accept_fd(ssh_bind sshbind, ssh_session session, socket_t fd){
     }
 
     session->common.log_verbosity = sshbind->common.log_verbosity;
-
+    if(sshbind->banner != NULL)
+    	session->opts.custombanner = strdup(sshbind->banner);
     ssh_socket_free(session->socket);
     session->socket = ssh_socket_new(session);
     if (session->socket == NULL) {
@@ -403,6 +425,16 @@ int ssh_bind_accept_fd(ssh_bind sshbind, ssh_session session, socket_t fd){
     ssh_socket_set_fd(session->socket, fd);
     ssh_socket_get_poll_handle_out(session->socket);
 
+    /* We must try to import any keys that could be imported in case
+     * we are not using ssh_bind_listen (which is the other place
+     * where keys can be imported) on this ssh_bind and are instead
+     * only using ssh_bind_accept_fd to manage sockets ourselves.
+     */
+    rc = ssh_bind_import_keys(sshbind);
+    if (rc != SSH_OK) {
+      return SSH_ERROR;
+    }
+
 #ifdef HAVE_ECC
     if (sshbind->ecdsa) {
         session->srv.ecdsa_key = ssh_key_dup(sshbind->ecdsa);

src/channels.c

@@ -916,10 +916,10 @@ int channel_default_bufferize(ssh_channel channel, void *data, int len,
  *                      SSH_AGAIN if in nonblocking mode and call has
  *                      to be done again.
  *
- * @see channel_open_forward()
- * @see channel_request_env()
- * @see channel_request_shell()
- * @see channel_request_exec()
+ * @see ssh_channel_open_forward()
+ * @see ssh_channel_request_env()
+ * @see ssh_channel_request_shell()
+ * @see ssh_channel_request_exec()
  */
 int ssh_channel_open_session(ssh_channel channel) {
   if(channel == NULL) {
@@ -952,7 +952,7 @@ int ssh_channel_open_session(ssh_channel channel) {
  *                      SSH_AGAIN if in nonblocking mode and call has
  *                      to be done again.
  *
- * @see channel_open_forward()
+ * @see ssh_channel_open_forward()
  */
 int ssh_channel_open_auth_agent(ssh_channel channel){
   if(channel == NULL) {
@@ -1120,8 +1120,24 @@ void ssh_channel_do_free(ssh_channel channel){
  *
  * @return              SSH_OK on success, SSH_ERROR if an error occurred.
  *
- * @see channel_close()
- * @see channel_free()
+ * Example:
+@code
+   rc = ssh_channel_send_eof(channel);
+   if (rc == SSH_ERROR) {
+       return -1;
+   }
+   while(!ssh_channel_is_eof(channel)) {
+       rc = ssh_channel_read(channel, buf, sizeof(buf), 0);
+       if (rc == SSH_ERROR) {
+           return -1;
+       }
+   }
+   ssh_channel_close(channel);
+@endcode
+ *
+ * @see ssh_channel_close()
+ * @see ssh_channel_free()
+ * @see ssh_channel_is_eof()
  */
 int ssh_channel_send_eof(ssh_channel channel){
   ssh_session session;
@@ -1170,8 +1186,8 @@ error:
  *
  * @return              SSH_OK on success, SSH_ERROR if an error occurred.
  *
- * @see channel_free()
- * @see channel_eof()
+ * @see ssh_channel_free()
+ * @see ssh_channel_is_eof()
  */
 int ssh_channel_close(ssh_channel channel){
   ssh_session session;
@@ -1397,7 +1413,7 @@ uint32_t ssh_channel_window_size(ssh_channel channel) {
  *
  * @return              The number of bytes written, SSH_ERROR on error.
  *
- * @see channel_read()
+ * @see ssh_channel_read()
  */
 int ssh_channel_write(ssh_channel channel, const void *data, uint32_t len) {
   return channel_write_common(channel, data, len, 0);
@@ -1410,7 +1426,7 @@ int ssh_channel_write(ssh_channel channel, const void *data, uint32_t len) {
  *
  * @return              0 if channel is closed, nonzero otherwise.
  *
- * @see channel_is_closed()
+ * @see ssh_channel_is_closed()
  */
 int ssh_channel_is_open(ssh_channel channel) {
     if(channel == NULL) {
@@ -1426,7 +1442,7 @@ int ssh_channel_is_open(ssh_channel channel) {
  *
  * @return              0 if channel is opened, nonzero otherwise.
  *
- * @see channel_is_open()
+ * @see ssh_channel_is_open()
  */
 int ssh_channel_is_closed(ssh_channel channel) {
     if(channel == NULL) {
@@ -1725,7 +1741,7 @@ error:
  *                      SSH_AGAIN if in nonblocking mode and call has
  *                      to be done again.
  *
- * @see channel_request_pty_size()
+ * @see ssh_channel_request_pty_size()
  */
 int ssh_channel_request_pty(ssh_channel channel) {
   return ssh_channel_request_pty_size(channel, "xterm", 80, 24);
@@ -1964,7 +1980,7 @@ error:
 }
 
 static ssh_channel ssh_channel_accept(ssh_session session, int channeltype,
-    int timeout_ms) {
+    int timeout_ms, int *destination_port) {
 #ifndef _WIN32
   static const struct timespec ts = {
     .tv_sec = 0,
@@ -1981,7 +1997,11 @@ static ssh_channel ssh_channel_accept(ssh_session session, int channeltype,
    * 50 ms. So we need to decrement by 100 ms.
    */
   for (t = timeout_ms; t >= 0; t -= 100) {
-    ssh_handle_packets(session, 50);
+    if (timeout_ms == 0) {
+        ssh_handle_packets(session, 0);
+    } else {
+        ssh_handle_packets(session, 50);
+    }
 
     if (session->ssh_message_list) {
       iterator = ssh_list_get_iterator(session->ssh_message_list);
@@ -1991,6 +2011,10 @@ static ssh_channel ssh_channel_accept(ssh_session session, int channeltype,
             ssh_message_subtype(msg) == channeltype) {
           ssh_list_remove(session->ssh_message_list, iterator);
           channel = ssh_message_channel_request_open_reply_accept(msg);
+          if(destination_port) {
+            *destination_port=msg->channel_request_open.destination_port;
+          }
+
           ssh_message_free(msg);
           return channel;
         }
@@ -2021,7 +2045,7 @@ static ssh_channel ssh_channel_accept(ssh_session session, int channeltype,
  *                      the server.
  */
 ssh_channel ssh_channel_accept_x11(ssh_channel channel, int timeout_ms) {
-  return ssh_channel_accept(channel->session, SSH_CHANNEL_X11, timeout_ms);
+  return ssh_channel_accept(channel->session, SSH_CHANNEL_X11, timeout_ms, NULL);
 }
 
 /**
@@ -2275,7 +2299,23 @@ error:
  *         the server
  */
 ssh_channel ssh_forward_accept(ssh_session session, int timeout_ms) {
-  return ssh_channel_accept(session, SSH_CHANNEL_FORWARDED_TCPIP, timeout_ms);
+  return ssh_channel_accept(session, SSH_CHANNEL_FORWARDED_TCPIP, timeout_ms, NULL);
+}
+
+/**
+ * @brief Accept an incoming TCP/IP forwarding channel and get information
+ * about incomming connection
+ * @param[in]  session    The ssh session to use.
+ *
+ * @param[in]  timeout_ms A timeout in milliseconds.
+ *
+ * @param[in]  destination_port A pointer to destination port or NULL.
+ *
+ * @return Newly created channel, or NULL if no incoming channel request from
+ *         the server
+ */
+ssh_channel ssh_channel_accept_forward(ssh_session session, int timeout_ms, int* destination_port) {
+  return ssh_channel_accept(session, SSH_CHANNEL_FORWARDED_TCPIP, timeout_ms, destination_port);
 }
 
 /**
@@ -2411,20 +2451,22 @@ error:
  *                      SSH_ERROR if an error occurred,
  *                      SSH_AGAIN if in nonblocking mode and call has
  *                      to be done again.
- * @code
- *   rc = channel_request_exec(channel, "ps aux");
- *   if (rc > 0) {
- *     return -1;
- *   }
  *
- *   while ((rc = channel_read(channel, buffer, sizeof(buffer), 0)) > 0) {
- *     if (fwrite(buffer, 1, rc, stdout) != (unsigned int) rc) {
- *       return -1;
- *     }
- *   }
- * @endcode
+ * Example:
+@code
+   rc = channel_request_exec(channel, "ps aux");
+   if (rc > 0) {
+       return -1;
+   }
+
+   while ((rc = channel_read(channel, buffer, sizeof(buffer), 0)) > 0) {
+       if (fwrite(buffer, 1, rc, stdout) != (unsigned int) rc) {
+           return -1;
+       }
+   }
+@endcode
  *
- * @see channel_request_shell()
+ * @see ssh_channel_request_shell()
  */
 int ssh_channel_request_exec(ssh_channel channel, const char *cmd) {
   ssh_buffer buffer = NULL;
@@ -2678,16 +2720,16 @@ int ssh_channel_read(ssh_channel channel, void *dest, uint32_t count, int is_std
 /**
  * @brief Reads data from a channel.
  *
- * @param[in]  channel  The channel to read from.
+ * @param[in]  channel     The channel to read from.
  *
- * @param[in]  dest     The destination buffer which will get the data.
+ * @param[in]  dest        The destination buffer which will get the data.
  *
- * @param[in]  count    The count of bytes to be read.
+ * @param[in]  count       The count of bytes to be read.
  *
- * @param[in]  is_stderr A boolean value to mark reading from the stderr flow.
+ * @param[in]  is_stderr   A boolean value to mark reading from the stderr flow.
  *
- * @param[in]  timeout  A timeout in seconds. A value of -1 means infinite
- *                      timeout.
+ * @param[in]  timeout_ms  A timeout in milliseconds. A value of -1 means
+ *                         infinite timeout.
  *
  * @return              The number of bytes read, 0 on end of file or SSH_ERROR
  *                      on error. In nonblocking mode it Can return 0 if no data
@@ -2803,7 +2845,7 @@ int ssh_channel_read_timeout(ssh_channel channel,
  *
  * @warning Don't forget to check for EOF as it would return 0 here.
  *
- * @see channel_is_eof()
+ * @see ssh_channel_is_eof()
  */
 int ssh_channel_read_nonblocking(ssh_channel channel, void *dest, uint32_t count,
     int is_stderr) {
@@ -2855,7 +2897,7 @@ int ssh_channel_read_nonblocking(ssh_channel channel, void *dest, uint32_t count
  *
  * @warning When the channel is in EOF state, the function returns SSH_EOF.
  *
- * @see channel_is_eof()
+ * @see ssh_channel_is_eof()
  */
 int ssh_channel_poll(ssh_channel channel, int is_stderr){
   ssh_buffer stdbuf;
@@ -2907,7 +2949,7 @@ int ssh_channel_poll(ssh_channel channel, int is_stderr){
  *
  * @warning When the channel is in EOF state, the function returns SSH_EOF.
  *
- * @see channel_is_eof()
+ * @see ssh_channel_is_eof()
  */
 int ssh_channel_poll_timeout(ssh_channel channel, int timeout, int is_stderr){
   ssh_session session;
@@ -3212,7 +3254,7 @@ int ssh_channel_select(ssh_channel *readchans, ssh_channel *writechans,
  *
  * @return              The number of bytes written, SSH_ERROR on error.
  *
- * @see channel_read()
+ * @see ssh_channel_read()
  */
 int ssh_channel_write_stderr(ssh_channel channel, const void *data, uint32_t len) {
   return channel_write_common(channel, data, len, 1);

src/client.c

@@ -152,19 +152,27 @@ int ssh_send_banner(ssh_session session, int server) {
   banner = session->version == 1 ? CLIENTBANNER1 : CLIENTBANNER2;
 
   if (server) {
-    session->serverbanner = strdup(banner);
+    if(session->opts.custombanner == NULL){
+    	session->serverbanner = strdup(banner);
+    } else {
+    	session->serverbanner = malloc(strlen(session->opts.custombanner) + 9);
+    	if(!session->serverbanner)
+    		goto end;
+    	strcpy(session->serverbanner, "SSH-2.0-");
+    	strcat(session->serverbanner, session->opts.custombanner);
+    }
     if (session->serverbanner == NULL) {
       goto end;
     }
+    snprintf(buffer, 128, "%s\n", session->serverbanner);
   } else {
     session->clientbanner = strdup(banner);
     if (session->clientbanner == NULL) {
       goto end;
     }
+    snprintf(buffer, 128, "%s\n", session->clientbanner);
   }
 
-  snprintf(buffer, 128, "%s\n", banner);
-
   if (ssh_socket_write(session->socket, buffer, strlen(buffer)) == SSH_ERROR) {
     goto end;
   }
@@ -536,7 +544,8 @@ pending:
       }
       SSH_LOG(SSH_LOG_PACKET,"ssh_connect: Actual timeout : %d", timeout);
       ret = ssh_handle_packets_termination(session, timeout, ssh_connect_termination, session);
-      if (ret == SSH_ERROR || !ssh_connect_termination(session)) {
+      if (session->session_state != SSH_SESSION_STATE_ERROR &&
+          (ret == SSH_ERROR || !ssh_connect_termination(session))) {
           ssh_set_error(session, SSH_FATAL,
                         "Timeout connecting to %s", session->opts.host);
           session->session_state = SSH_SESSION_STATE_ERROR;

src/connect.c

@@ -421,7 +421,7 @@ static int ssh_select_cb (socket_t fd, int revents, void *userdata){
  * @param[in]  readfds  A fd_set of file descriptors to be select'ed for
  *                      reading.
  *
- * @param[in]  timeout  A timeout for the select.
+ * @param[in]  timeout  The timeout in milliseconds.
  *
  * @return              SSH_OK on success,
  *                      SSH_ERROR on error,

src/dh.c

@@ -170,7 +170,7 @@ int ssh_crypto_init(void) {
       return -1;
     }
     bignum_bin2bn(p_group14_value, P_GROUP14_LEN, &p_group14);
-    if (p_group1 == NULL) {
+    if (p_group14 == NULL) {
       bignum_free(g);
       bignum_free(p_group1);
       g = NULL;

src/error.c

@@ -104,7 +104,7 @@ void _ssh_set_error_invalid(void *error, const char *function)
 /**
  * @brief Retrieve the error text message from the last error.
  *
- * @param  error        The SSH session pointer.
+ * @param  error        An ssh_session or ssh_bind.
  *
  * @return A static string describing the error.
  */
@@ -117,7 +117,7 @@ const char *ssh_get_error(void *error) {
 /**
  * @brief Retrieve the error code from the last error.
  *
- * @param  error        The SSH session pointer.
+ * @param  error        An ssh_session or ssh_bind.
  *
  * \return SSH_NO_ERROR       No error occurred\n
  *         SSH_REQUEST_DENIED The last request was denied but situation is

src/kex.c

@@ -35,6 +35,7 @@
 #include "libssh/ssh2.h"
 #include "libssh/string.h"
 #include "libssh/curve25519.h"
+#include "libssh/knownhosts.h"
 
 #ifdef HAVE_LIBGCRYPT
 # define BLOWFISH "blowfish-cbc,"
@@ -373,6 +374,53 @@ void ssh_list_kex(struct ssh_kex_struct *kex) {
   }
 }
 
+/**
+ * @internal
+ * @brief selects the hostkey mechanisms to be chosen for the key exchange,
+ * as some hostkey mechanisms may be present in known_hosts file and preferred
+ * @returns a cstring containing a comma-separated list of hostkey methods.
+ *          NULL if no method matches
+ */
+static char *ssh_client_select_hostkeys(ssh_session session){
+    char methods_buffer[128]={0};
+    static const char *preferred_hostkeys[]={"ecdsa-sha2-nistp521","ecdsa-sha2-nistp384",
+    		"ecdsa-sha2-nistp256", "ssh-rsa", "ssh-dss", "ssh-rsa1", NULL};
+    char **methods;
+    int i,j;
+    int needcoma=0;
+
+    methods = ssh_knownhosts_algorithms(session);
+	if (methods == NULL || methods[0] == NULL){
+		SAFE_FREE(methods);
+		return NULL;
+	}
+
+	for (i=0;preferred_hostkeys[i] != NULL; ++i){
+		for (j=0; methods[j] != NULL; ++j){
+			if(strcmp(preferred_hostkeys[i], methods[j]) == 0){
+				if (verify_existing_algo(SSH_HOSTKEYS, methods[j])){
+					if(needcoma)
+						strncat(methods_buffer,",",sizeof(methods_buffer)-strlen(methods_buffer)-1);
+					strncat(methods_buffer, methods[j], sizeof(methods_buffer)-strlen(methods_buffer)-1);
+					needcoma = 1;
+				}
+			}
+		}
+	}
+	for(i=0;methods[i]!= NULL; ++i){
+		SAFE_FREE(methods[i]);
+	}
+	SAFE_FREE(methods);
+
+	if(strlen(methods_buffer) > 0){
+		SSH_LOG(SSH_LOG_DEBUG, "Changing host key method to \"%s\"", methods_buffer);
+		return strdup(methods_buffer);
+	} else {
+		SSH_LOG(SSH_LOG_DEBUG, "No supported kex method for existing key in known_hosts file");
+		return NULL;
+	}
+
+}
 /**
  * @brief sets the key exchange parameters to be sent to the server,
  *        in function of the options and available methods.
@@ -385,6 +433,13 @@ int set_client_kex(ssh_session session){
     ssh_get_random(client->cookie, 16, 0);
 
     memset(client->methods, 0, KEX_METHODS_SIZE * sizeof(char **));
+    /* first check if we have specific host key methods */
+    if(session->opts.wanted_methods[SSH_HOSTKEYS] == NULL){
+    	/* Only if no override */
+    	session->opts.wanted_methods[SSH_HOSTKEYS] =
+    			ssh_client_select_hostkeys(session);
+    }
+
     for (i = 0; i < KEX_METHODS_SIZE; i++) {
         wanted = session->opts.wanted_methods[i];
         if (wanted == NULL)

src/known_hosts.c

@@ -34,7 +34,7 @@
 #include "libssh/misc.h"
 #include "libssh/pki.h"
 #include "libssh/options.h"
-
+#include "libssh/knownhosts.h"
 /*todo: remove this include */
 #include "libssh/string.h"
 
@@ -647,6 +647,102 @@ int ssh_write_knownhost(ssh_session session) {
     return 0;
 }
 
+#define KNOWNHOSTS_MAXTYPES 10
+
+/**
+ * @internal
+ * @brief Check which kind of host keys should be preferred for connection
+ *        by reading the known_hosts file.
+ *
+ * @param[in]  session  The SSH session to use.
+ *
+ * @returns array of supported key types
+ *			NULL on error
+ */
+char **ssh_knownhosts_algorithms(ssh_session session) {
+  FILE *file = NULL;
+  char **tokens;
+  char *host;
+  char *hostport;
+  const char *type;
+  int match;
+  char **array;
+  int i=0, j;
+
+  if (session->opts.knownhosts == NULL) {
+    if (ssh_options_apply(session) < 0) {
+      ssh_set_error(session, SSH_REQUEST_DENIED,
+          "Can't find a known_hosts file");
+      return NULL;
+    }
+  }
+
+  if (session->opts.host == NULL) {
+    return NULL;
+  }
+
+  host = ssh_lowercase(session->opts.host);
+  hostport = ssh_hostport(host, session->opts.port);
+  array = malloc(sizeof(char *) * KNOWNHOSTS_MAXTYPES);
+
+  if (host == NULL || hostport == NULL || array == NULL) {
+    ssh_set_error_oom(session);
+    SAFE_FREE(host);
+    SAFE_FREE(hostport);
+    SAFE_FREE(array);
+    return NULL;
+  }
+
+  do {
+    tokens = ssh_get_knownhost_line(&file,
+    		session->opts.knownhosts, &type);
+
+    /* End of file, return the current state */
+    if (tokens == NULL) {
+      break;
+    }
+    match = match_hashed_host(host, tokens[0]);
+    if (match == 0){
+    	match = match_hostname(hostport, tokens[0], strlen(tokens[0]));
+    }
+    if (match == 0) {
+      match = match_hostname(host, tokens[0], strlen(tokens[0]));
+    }
+    if (match == 0) {
+      match = match_hashed_host(hostport, tokens[0]);
+    }
+    if (match) {
+      /* We got a match. Now check the key type */
+    	SSH_LOG(SSH_LOG_DEBUG, "server %s:%d has %s in known_hosts",
+    							host, session->opts.port, type);
+    	/* don't copy more than once */
+    	for(j=0;j<i && match;++j){
+    		if(strcmp(array[j], type)==0)
+    			match=0;
+    	}
+    	if (match){
+    		array[i] = strdup(type);
+    		i++;
+    		if(i>= KNOWNHOSTS_MAXTYPES-1){
+    			tokens_free(tokens);
+    			break;
+    		}
+    	}
+    }
+    tokens_free(tokens);
+  } while (1);
+
+  array[i]=NULL;
+  SAFE_FREE(host);
+  SAFE_FREE(hostport);
+  if (file != NULL) {
+    fclose(file);
+  }
+
+  /* Return the current state at end of file */
+  return array;
+}
+
 /** @} */
 
 /* vim: set ts=4 sw=4 et cindent: */

src/messages.c

@@ -208,8 +208,8 @@ static int ssh_execute_server_request(ssh_session session, ssh_message msg)
                        ssh_callbacks_exists(channel->callbacks, channel_pty_window_change_function)) {
                 rc = channel->callbacks->channel_pty_window_change_function(session,
                                                                             channel,
-                                                                            msg->channel_request.height, msg->channel_request.width,
-                                                                            msg->channel_request.pxheight, msg->channel_request.pxwidth,
+                                                                            msg->channel_request.width, msg->channel_request.height,
+                                                                            msg->channel_request.pxwidth, msg->channel_request.pxheight,
                                                                             channel->callbacks->userdata);
             } else if (msg->channel_request.type == SSH_CHANNEL_REQUEST_EXEC &&
                        ssh_callbacks_exists(channel->callbacks, channel_exec_request_function)) {

src/misc.c

@@ -697,7 +697,6 @@ char *ssh_path_expand_tilde(const char *d) {
 }
 
 char *ssh_path_expand_escape(ssh_session session, const char *s) {
-#define MAX_BUF_SIZE 4096
     char host[NI_MAXHOST];
     char buf[MAX_BUF_SIZE];
     char *r, *x = NULL;

src/packet.c

@@ -251,12 +251,18 @@ int ssh_packet_socket_callback(const void *data, size_t receivedlen, void *user)
                  * Decrypt the rest of the packet (blocksize bytes already
                  * have been decrypted)
                  */
-                rc = packet_decrypt(session,
-                                    ((uint8_t*)buffer_get_rest(session->in_buffer) + blocksize),
-                                    buffer_get_rest_len(session->in_buffer) - blocksize);
-                if (rc < 0) {
-                    ssh_set_error(session, SSH_FATAL, "Decrypt error");
-                    goto error;
+                uint32_t buffer_len = buffer_get_rest_len(session->in_buffer);
+
+                /* The following check avoids decrypting zero bytes */
+                if (buffer_len > blocksize) {
+                    uint8_t *payload = ((uint8_t*)buffer_get_rest(session->in_buffer) + blocksize);
+                    uint32_t plen = buffer_len - blocksize;
+
+                    rc = packet_decrypt(session, payload, plen);
+                    if (rc < 0) {
+                        ssh_set_error(session, SSH_FATAL, "Decrypt error");
+                        goto error;
+                    }
                 }
 
                 /* copy the last part from the incoming buffer */

src/packet1.c

@@ -106,7 +106,7 @@ int ssh_packet_socket_callback1(const void *data, size_t receivedlen, void *user
   size_t processed=0;
   uint32_t padding;
   uint32_t crc;
-  uint32_t len;
+  uint32_t len, buffer_len;
   ssh_session session=(ssh_session)user;
 
   switch (session->packet_state){
@@ -168,11 +168,16 @@ int ssh_packet_socket_callback1(const void *data, size_t receivedlen, void *user
          * We decrypt everything, missing the lenght part (which was
          * previously read, unencrypted, and is not part of the buffer
          */
-        if (packet_decrypt(session,
-              ssh_buffer_get_begin(session->in_buffer),
-              ssh_buffer_get_len(session->in_buffer)) < 0) {
-          ssh_set_error(session, SSH_FATAL, "Packet decrypt error");
-          goto error;
+        buffer_len = ssh_buffer_get_len(session->in_buffer);
+        if (buffer_len > 0) {
+          int rc;
+          rc = packet_decrypt(session,
+                 ssh_buffer_get_begin(session->in_buffer),
+                 buffer_len);
+          if (rc < 0) {
+            ssh_set_error(session, SSH_FATAL, "Packet decrypt error");
+            goto error;
+          }
         }
       }
 #ifdef DEBUG_CRYPTO
@@ -300,6 +305,8 @@ int packet_send1(ssh_session session) {
       ssh_buffer_get_len(session->out_buffer));
 #endif
 
+  /* session->out_buffer should have more than sizeof(uint32_t) bytes
+     in it as required for packet_encrypt */
   packet_encrypt(session, (unsigned char *)ssh_buffer_get_begin(session->out_buffer) + sizeof(uint32_t),
       ssh_buffer_get_len(session->out_buffer) - sizeof(uint32_t));
 

src/packet_crypt.c

@@ -22,6 +22,7 @@
  */
 
 #include "config.h"
+#include <assert.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
@@ -59,6 +60,9 @@ uint32_t packet_decrypt_len(ssh_session session, char *crypted){
 int packet_decrypt(ssh_session session, void *data,uint32_t len) {
   struct ssh_cipher_struct *crypto = session->current_crypto->in_cipher;
   char *out = NULL;
+
+  assert(len);
+
   if(len % session->current_crypto->in_cipher->blocksize != 0){
     ssh_set_error(session, SSH_FATAL, "Cryptographic functions must be set on at least one blocksize (received %d)",len);
     return SSH_ERROR;
@@ -89,6 +93,8 @@ unsigned char *packet_encrypt(ssh_session session, void *data, uint32_t len) {
   unsigned int finallen;
   uint32_t seq;
 
+  assert(len);
+
   if (!session->current_crypto) {
     return NULL; /* nothing to do here */
   }

src/pki_crypto.c

@@ -200,9 +200,11 @@ int pki_pubkey_build_ecdsa(ssh_key key, int nid, ssh_string e)
         return -1;
     }
 
+    /* EC_KEY_set_public_key duplicates p */
     ok = EC_KEY_set_public_key(key->ecdsa, p);
+    EC_POINT_free(p);
     if (!ok) {
-        EC_POINT_free(p);
+        return -1;
     }
 
     return 0;
@@ -1094,41 +1096,65 @@ static ssh_string _RSA_do_sign(const unsigned char *digest,
     return sig_blob;
 }
 
+static ssh_string pki_dsa_signature_to_blob(const ssh_signature sig)
+{
+    char buffer[40] = { 0 };
+    ssh_string sig_blob = NULL;
+
+    ssh_string r;
+    int r_len, r_offset_in, r_offset_out;
+
+    ssh_string s;
+    int s_len, s_offset_in, s_offset_out;
+
+    r = make_bignum_string(sig->dsa_sig->r);
+    if (r == NULL) {
+        return NULL;
+    }
+
+    s = make_bignum_string(sig->dsa_sig->s);
+    if (s == NULL) {
+        ssh_string_free(r);
+        return NULL;
+    }
+
+    r_len = ssh_string_len(r);
+    r_offset_in  = (r_len > 20) ? (r_len - 20) : 0;
+    r_offset_out = (r_len < 20) ? (20 - r_len) : 0;
+
+    s_len = ssh_string_len(s);
+    s_offset_in  = (s_len > 20) ? (s_len - 20) : 0;
+    s_offset_out = (s_len < 20) ? (20 - s_len) : 0;
+
+    memcpy(buffer + r_offset_out,
+           ((char *)ssh_string_data(r)) + r_offset_in,
+           r_len - r_offset_in);
+    memcpy(buffer + 20 + s_offset_out,
+           ((char *)ssh_string_data(s)) + s_offset_in,
+           s_len - s_offset_in);
+
+    ssh_string_free(r);
+    ssh_string_free(s);
+
+    sig_blob = ssh_string_new(40);
+    if (sig_blob == NULL) {
+        return NULL;
+    }
+
+    ssh_string_fill(sig_blob, buffer, 40);
+
+    return sig_blob;
+}
+
 ssh_string pki_signature_to_blob(const ssh_signature sig)
 {
-    char buffer[40] = {0};
-    ssh_string sig_blob = NULL;
     ssh_string r;
     ssh_string s;
+    ssh_string sig_blob = NULL;
 
     switch(sig->type) {
         case SSH_KEYTYPE_DSS:
-            r = make_bignum_string(sig->dsa_sig->r);
-            if (r == NULL) {
-                return NULL;
-            }
-            s = make_bignum_string(sig->dsa_sig->s);
-            if (s == NULL) {
-                ssh_string_free(r);
-                return NULL;
-            }
-
-            memcpy(buffer,
-                   ((char *)ssh_string_data(r)) + ssh_string_len(r) - 20,
-                   20);
-            memcpy(buffer + 20,
-                   ((char *)ssh_string_data(s)) + ssh_string_len(s) - 20,
-                   20);
-
-            ssh_string_free(r);
-            ssh_string_free(s);
-
-            sig_blob = ssh_string_new(40);
-            if (sig_blob == NULL) {
-                return NULL;
-            }
-
-            ssh_string_fill(sig_blob, buffer, 40);
+            sig_blob = pki_dsa_signature_to_blob(sig);
             break;
         case SSH_KEYTYPE_RSA:
         case SSH_KEYTYPE_RSA1:
@@ -1188,6 +1214,61 @@ ssh_string pki_signature_to_blob(const ssh_signature sig)
     return sig_blob;
 }
 
+static ssh_signature pki_signature_from_rsa_blob(const ssh_key pubkey,
+                                                 const ssh_string sig_blob,
+                                                 ssh_signature sig)
+{
+    uint32_t pad_len = 0;
+    char *blob_orig;
+    char *blob_padded_data;
+    ssh_string sig_blob_padded;
+
+    size_t len = ssh_string_len(sig_blob);
+    size_t rsalen= RSA_size(pubkey->rsa);
+
+    if (len > rsalen) {
+        ssh_pki_log("Signature is too big: %lu > %lu",
+                    (unsigned long)len, (unsigned long)rsalen);
+        goto errout;
+    }
+
+#ifdef DEBUG_CRYPTO
+    ssh_pki_log("RSA signature len: %lu", (unsigned long)len);
+    ssh_print_hexa("RSA signature", ssh_string_data(sig_blob), len);
+#endif
+
+    if (len == rsalen) {
+        sig->rsa_sig = ssh_string_copy(sig_blob);
+    } else {
+        /* pad the blob to the expected rsalen size */
+        ssh_pki_log("RSA signature len %lu < %lu",
+                    (unsigned long)len, (unsigned long)rsalen);
+
+        pad_len = rsalen - len;
+
+        sig_blob_padded = ssh_string_new(rsalen);
+        if (sig_blob_padded == NULL) {
+            goto errout;
+        }
+
+        blob_padded_data = (char *) ssh_string_data(sig_blob_padded);
+        blob_orig = (char *) ssh_string_data(sig_blob);
+
+        /* front-pad the buffer with zeroes */
+        BURN_BUFFER(blob_padded_data, pad_len);
+        /* fill the rest with the actual signature blob */
+        memcpy(blob_padded_data + pad_len, blob_orig, len);
+
+        sig->rsa_sig = sig_blob_padded;
+    }
+
+    return sig;
+
+errout:
+    ssh_signature_free(sig);
+    return NULL;
+}
+
 ssh_signature pki_signature_from_blob(const ssh_key pubkey,
                                       const ssh_string sig_blob,
                                       enum ssh_keytypes_e type)
@@ -1196,7 +1277,6 @@ ssh_signature pki_signature_from_blob(const ssh_key pubkey,
     ssh_string r;
     ssh_string s;
     size_t len;
-    size_t rsalen;
 
     sig = ssh_signature_new();
     if (sig == NULL) {
@@ -1260,29 +1340,7 @@ ssh_signature pki_signature_from_blob(const ssh_key pubkey,
             break;
         case SSH_KEYTYPE_RSA:
         case SSH_KEYTYPE_RSA1:
-            rsalen = RSA_size(pubkey->rsa);
-
-            if (len > rsalen) {
-                ssh_pki_log("Signature is to big size: %lu",
-                            (unsigned long)len);
-                ssh_signature_free(sig);
-                return NULL;
-            }
-
-            if (len < rsalen) {
-                ssh_pki_log("RSA signature len %lu < %lu",
-                            (unsigned long)len, (unsigned long)rsalen);
-            }
-
-#ifdef DEBUG_CRYPTO
-            ssh_pki_log("RSA signature len: %lu", (unsigned long)len);
-            ssh_print_hexa("RSA signature", ssh_string_data(sig_blob), len);
-#endif
-            sig->rsa_sig = ssh_string_copy(sig_blob);
-            if (sig->rsa_sig == NULL) {
-                ssh_signature_free(sig);
-                return NULL;
-            }
+            sig = pki_signature_from_rsa_blob(pubkey, sig_blob, sig);
             break;
         case SSH_KEYTYPE_ECDSA:
 #ifdef HAVE_OPENSSL_ECC

src/scp.c

@@ -545,7 +545,7 @@ int ssh_scp_read_string(ssh_scp scp, char *buffer, size_t len){
  * @see ssh_scp_request_get_warning()
  */
 int ssh_scp_pull_request(ssh_scp scp){
-  char buffer[4096] = {0};
+  char buffer[MAX_BUF_SIZE] = {0};
   char *mode=NULL;
   char *p,*tmp;
   uint64_t size;
@@ -642,7 +642,7 @@ int ssh_scp_pull_request(ssh_scp scp){
  *                      the message failed, or sending it in a bad state.
  */
 int ssh_scp_deny_request(ssh_scp scp, const char *reason){
-  char buffer[4096];
+  char buffer[MAX_BUF_SIZE];
   int err;
   if(scp==NULL)
       return SSH_ERROR;
@@ -814,7 +814,7 @@ int ssh_scp_integer_mode(const char *mode){
  */
 char *ssh_scp_string_mode(int mode){
 	char buffer[16];
-	snprintf(buffer,sizeof(buffer),"%.4d",mode);
+	snprintf(buffer,sizeof(buffer),"%.4o",mode);
 	return strdup(buffer);
 }
 

src/session.c

@@ -309,6 +309,38 @@ const char* ssh_get_serverbanner(ssh_session session) {
 	return session->serverbanner;
 }
 
+/**
+ * @brief get the name of the input for the given session.
+ *
+ * @param[in] session The SSH session.
+ *
+ * @return Returns cipher name or NULL.
+ */
+const char* ssh_get_cipher_in(ssh_session session) {
+    if ((session != NULL) &&
+        (session->current_crypto != NULL) &&
+        (session->current_crypto->in_cipher != NULL)) {
+        return session->current_crypto->in_cipher->name;
+    }
+    return NULL;
+}
+
+/**
+ * @brief get the name of the output cipher for the given session.
+ *
+ * @param[in] session The SSH session.
+ *
+ * @return Returns cipher name or NULL.
+ */
+const char* ssh_get_cipher_out(ssh_session session) {
+    if ((session != NULL) &&
+        (session->current_crypto != NULL) &&
+        (session->current_crypto->out_cipher != NULL)) {
+        return session->current_crypto->out_cipher->name;
+    }
+    return NULL;
+}
+
 /**
  * @brief Disconnect impolitely from a remote host by closing the socket.
  *
@@ -567,7 +599,11 @@ int ssh_handle_packets_termination(ssh_session session,
         }
     }
 
-    ssh_timestamp_init(&ts);
+    /* avoid unnecessary syscall for the SSH_TIMEOUT_NONBLOCKING case */
+    if (timeout != SSH_TIMEOUT_NONBLOCKING) {
+        ssh_timestamp_init(&ts);
+    }
+
     tm = timeout;
     while(!fct(user)) {
         ret = ssh_handle_packets(session, tm);
@@ -695,8 +731,13 @@ void ssh_socket_exception_callback(int code, int errno_code, void *user){
     ssh_session session=(ssh_session)user;
 
     SSH_LOG(SSH_LOG_RARE,"Socket exception callback: %d (%d)",code, errno_code);
-    session->session_state=SSH_SESSION_STATE_ERROR;
-    ssh_set_error(session,SSH_FATAL,"Socket error: %s",strerror(errno_code));
+    session->session_state = SSH_SESSION_STATE_ERROR;
+    if (errno_code == 0 && code == SSH_SOCKET_EXCEPTION_EOF) {
+        ssh_set_error(session, SSH_FATAL, "Socket error: disconnected");
+    } else {
+        ssh_set_error(session, SSH_FATAL, "Socket error: %s", strerror(errno_code));
+    }
+
     session->ssh_connection_callback(session);
 }
 

src/sftp.c

@@ -308,7 +308,7 @@ int sftp_packet_write(sftp_session sftp, uint8_t type, ssh_buffer payload){
 }
 
 sftp_packet sftp_packet_read(sftp_session sftp) {
-  unsigned char buffer[4096];
+  unsigned char buffer[MAX_BUF_SIZE];
   sftp_packet packet = NULL;
   uint32_t size;
   int r;

src/socket.c

@@ -218,7 +218,7 @@ void ssh_socket_set_callbacks(ssh_socket s, ssh_socket_callbacks callbacks){
  */
 int ssh_socket_pollcallback(struct ssh_poll_handle_struct *p, socket_t fd, int revents, void *v_s){
 	ssh_socket s=(ssh_socket )v_s;
-	char buffer[4096];
+	char buffer[MAX_BUF_SIZE];
 	int r;
 	int err=0;
 	socklen_t errlen=sizeof(err);
@@ -291,7 +291,7 @@ int ssh_socket_pollcallback(struct ssh_poll_handle_struct *p, socket_t fd, int r
 							buffer_get_rest_len(s->in_buffer),
 							s->callbacks->userdata);
 					buffer_pass_bytes(s->in_buffer,r);
-				} while (r > 0);
+				} while ((r > 0) && (s->state == SSH_SOCKET_CONNECTED));
 				/* p may have been freed, so don't use it
 				* anymore in this function */
 				p = NULL;
@@ -440,6 +440,8 @@ void ssh_socket_close(ssh_socket s){
     ssh_poll_free(s->poll_out);
     s->poll_out=NULL;
   }
+
+  s->state = SSH_SOCKET_CLOSED;
 }
 
 /**

src/threads.c

@@ -59,8 +59,28 @@ struct ssh_threads_callbacks_struct *ssh_threads_get_noop(void) {
 static struct ssh_threads_callbacks_struct *user_callbacks =&ssh_threads_noop;
 
 #ifdef HAVE_LIBGCRYPT
+#if (GCRYPT_VERSION_NUMBER >= 0x010600)
+/* libgcrypt >= 1.6 does not support custom callbacks */
+GCRY_THREAD_OPTION_PTHREAD_IMPL;
 
-/* Libgcrypt specific way of handling thread callbacks */
+static int libgcrypt_thread_init(void){
+	if(user_callbacks == NULL)
+		return SSH_ERROR;
+	if(user_callbacks == &ssh_threads_noop)
+		return SSH_OK;
+	if (strcmp(user_callbacks->type, "threads_pthread") == 0){
+		gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
+		return SSH_OK;
+	} else {
+		/* not supported */
+		SSH_LOG(SSH_LOG_WARN, "Custom thread handlers not supported with libgcrypt >=1.6, using pthreads");
+		gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
+		return SSH_OK;
+	}
+}
+
+#else
+/* Libgcrypt < 1.6 specific way of handling thread callbacks */
 
 static struct gcry_thread_cbs gcrypt_threads_callbacks;
 
@@ -79,7 +99,8 @@ static int libgcrypt_thread_init(void){
 	gcry_control(GCRYCTL_SET_THREAD_CBS, &gcrypt_threads_callbacks);
 	return SSH_OK;
 }
-#else
+#endif /* GCRYPT_VERSION_NUMBER */
+#else /* HAVE_LIBGCRYPT */
 
 /* Libcrypto specific stuff */
 

tests/client/torture_knownhosts.c

@@ -23,8 +23,26 @@
 
 #include "torture.h"
 #include "session.c"
+#include "known_hosts.c"
 
 #define KNOWNHOSTFILES "libssh_torture_knownhosts"
+#define BADRSA "AAAAB3NzaC1yc2EAAAADAQABAAABAQChm5" \
+ "a6Av65O8cKtx5YXOnui3wJnYE6A6J/I4kZSAibbn14Jcl+34VJQwv96f25AxNmo" \
+ "NwoiZV93IzdypQmiuieh6s6wB9WhYjU9K/6CkIpNhpCxswA90b3ePjS7LnR9B9J" \
+ "slPSbG1H0KC1c5lb7G3utXteXtM+4YvCvpN5VdC4CpghT+p0cwN2Na8Md5vRItz" \
+ "YgIytryNn7LLiwYfoSxvWigFrTTZsrVtCOYyNgklmffpGdzuC43wdANvTewfI9G" \
+ "o71r8EXmEc228CrYPmb8Scv3mpXFK/BosohSGkPlEHu9lf3YjnknBicDaVtJOYp" \
+ "wnXJPjZo2EhG79HxDRpjJHH"
+#define BADDSA "AAAAB3NzaC1kc3MAAACBAITDKqGQ5aC5wHySG6ZdL1+BVBY2nLP5vzw3i3pvZfP" \
+ "yNUS0UCwrt5pajsMvDRGXXebTJhWVonDnv8tpSgiuIBXMZrma8CU1KCFGRzwb/n8" \
+ "cc5tJmIphlOUTrObjBmsRz7u1eZmoaddXC9ask6BNnt0DmhzYi2esL3mbardy8IN" \
+ "zAAAAFQDlPFCm410pgQQPb3X5FWjyVEIl+QAAAIAp0vqfir8K8p+zP4dzFG7ppnt" \
+ "DjaXf3ge6URF7f5xPDo6CClGo2JQ2REF8NxM7K9cLgR9Ifx2ahO48UMgrXEl/BOp" \
+ "IQHpeBqUz26a49O5J0WEW16YSUHxWwMxWVe/SRmyKdTUZJ6fcepH88JNqm3XudNn" \
+ "s78grM+yx9mcXnK2AsAAAAIBxpF8ZQIlGrSgwCmCfwjP156bC3Ya6LYf9ZpLJ0dX" \
+ "EcxqLVllrNEvd2EGD9p16BYO2yaalYon8im59PtOcul2ay5XQ6rVDQ2T0pgNUpsI" \
+ "h0dSi8VJXI1wes5HTyLsv9VBmU1uCXUUvufoQKfF/OcSH0ufcCpnd62g1/adZcy2" \
+ "WJg=="
 
 static void setup(void **state) {
     int verbosity=torture_libssh_verbosity();
@@ -93,10 +111,184 @@ static void torture_knownhosts_port(void **state) {
     assert_true(rc == SSH_SERVER_KNOWN_OK);
 }
 
+static void torture_knownhosts_fail(void **state) {
+    ssh_session session = *state;
+    FILE *file;
+    int rc;
+
+    rc = ssh_options_set(session, SSH_OPTIONS_HOST, "localhost");
+    assert_true(rc == SSH_OK);
+
+    rc = ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, KNOWNHOSTFILES);
+    assert_true(rc == SSH_OK);
+
+    rc = ssh_options_set(session, SSH_OPTIONS_HOSTKEYS, "ssh-rsa");
+    assert_true(rc == SSH_OK);
+
+    file = fopen(KNOWNHOSTFILES, "w");
+    assert_true(file != NULL);
+    fprintf(file, "localhost ssh-rsa %s\n", BADRSA);
+    fclose(file);
+
+    rc = ssh_connect(session);
+    assert_true(rc==SSH_OK);
+
+    rc = ssh_is_server_known(session);
+    assert_true(rc == SSH_SERVER_KNOWN_CHANGED);
+}
+
+static void torture_knownhosts_other(void **state) {
+    ssh_session session = *state;
+    FILE *file;
+    int rc;
+
+    rc = ssh_options_set(session, SSH_OPTIONS_HOST, "localhost");
+    assert_true(rc == SSH_OK);
+
+    rc = ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, KNOWNHOSTFILES);
+    assert_true(rc == SSH_OK);
+
+    rc = ssh_options_set(session, SSH_OPTIONS_HOSTKEYS, "ssh-dss");
+    assert_true(rc == SSH_OK);
+
+    file = fopen(KNOWNHOSTFILES, "w");
+    assert_true(file != NULL);
+    fprintf(file, "localhost ssh-rsa %s\n", BADRSA);
+    fclose(file);
+
+    rc = ssh_connect(session);
+    assert_true(rc==SSH_OK);
+
+    rc = ssh_is_server_known(session);
+    assert_true(rc == SSH_SERVER_FOUND_OTHER);
+}
+
+static void torture_knownhosts_other_auto(void **state) {
+    ssh_session session = *state;
+    int rc;
+
+    rc = ssh_options_set(session, SSH_OPTIONS_HOST, "localhost");
+    assert_true(rc == SSH_OK);
+
+    rc = ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, KNOWNHOSTFILES);
+    assert_true(rc == SSH_OK);
+
+    rc = ssh_options_set(session, SSH_OPTIONS_HOSTKEYS, "ssh-dss");
+    assert_true(rc == SSH_OK);
+
+    rc = ssh_connect(session);
+    assert_true(rc==SSH_OK);
+
+    rc = ssh_is_server_known(session);
+    assert_true(rc == SSH_SERVER_NOT_KNOWN);
+
+    rc = ssh_write_knownhost(session);
+    assert_true(rc == SSH_OK);
+
+    ssh_disconnect(session);
+    ssh_free(session);
+
+    /* connect again and check host key */
+    *state = session = ssh_new();
+
+    rc = ssh_options_set(session, SSH_OPTIONS_HOST, "localhost");
+    assert_true(rc == SSH_OK);
+
+    rc = ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, KNOWNHOSTFILES);
+    assert_true(rc == SSH_OK);
+
+    rc = ssh_connect(session);
+    assert_true(rc==SSH_OK);
+
+    /* ssh-rsa is the default but libssh should try ssh-dss instead */
+    rc = ssh_is_server_known(session);
+    assert_true(rc == SSH_SERVER_KNOWN_OK);
+}
+
+static void torture_knownhosts_conflict(void **state) {
+    ssh_session session = *state;
+    FILE *file;
+    int rc;
+
+    rc = ssh_options_set(session, SSH_OPTIONS_HOST, "localhost");
+    assert_true(rc == SSH_OK);
+
+    rc = ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, KNOWNHOSTFILES);
+    assert_true(rc == SSH_OK);
+
+    rc = ssh_options_set(session, SSH_OPTIONS_HOSTKEYS, "ssh-rsa");
+    assert_true(rc == SSH_OK);
+
+    file = fopen(KNOWNHOSTFILES, "w");
+    assert_true(file != NULL);
+    fprintf(file, "localhost ssh-rsa %s\n", BADRSA);
+    fprintf(file, "localhost ssh-dss %s\n", BADDSA);
+    fclose(file);
+
+    rc = ssh_connect(session);
+    assert_true(rc==SSH_OK);
+
+    rc = ssh_is_server_known(session);
+    assert_true(rc == SSH_SERVER_KNOWN_CHANGED);
+
+    rc = ssh_write_knownhost(session);
+    assert_true(rc==SSH_OK);
+
+    ssh_disconnect(session);
+    ssh_free(session);
+
+    /* connect again and check host key */
+    *state = session = ssh_new();
+
+    ssh_options_set(session, SSH_OPTIONS_HOST, "localhost");
+    ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, KNOWNHOSTFILES);
+    rc = ssh_options_set(session, SSH_OPTIONS_HOSTKEYS, "ssh-rsa");
+    assert_true(rc == SSH_OK);
+
+    rc = ssh_connect(session);
+    assert_true(rc == SSH_OK);
+
+    rc = ssh_is_server_known(session);
+    assert_true(rc == SSH_SERVER_KNOWN_OK);
+}
+
+static void torture_knownhosts_precheck(void **state) {
+    ssh_session session = *state;
+    FILE *file;
+    int rc;
+    char **kex;
+
+    rc = ssh_options_set(session, SSH_OPTIONS_HOST, "localhost");
+    assert_true(rc == SSH_OK);
+
+    rc = ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, KNOWNHOSTFILES);
+    assert_true(rc == SSH_OK);
+
+    file = fopen(KNOWNHOSTFILES, "w");
+    assert_true(file != NULL);
+    fprintf(file, "localhost ssh-rsa %s\n", BADRSA);
+    fprintf(file, "localhost ssh-dss %s\n", BADDSA);
+    fclose(file);
+
+    kex = ssh_knownhosts_algorithms(session);
+    assert_true(kex != NULL);
+    assert_string_equal(kex[0],"ssh-rsa");
+    assert_string_equal(kex[1],"ssh-dss");
+    assert_true(kex[2]==NULL);
+    free(kex[1]);
+    free(kex[0]);
+    free(kex);
+}
+
 int torture_run_tests(void) {
     int rc;
     const UnitTest tests[] = {
         unit_test_setup_teardown(torture_knownhosts_port, setup, teardown),
+        unit_test_setup_teardown(torture_knownhosts_fail, setup, teardown),
+        unit_test_setup_teardown(torture_knownhosts_other, setup, teardown),
+        unit_test_setup_teardown(torture_knownhosts_other_auto, setup, teardown),
+        unit_test_setup_teardown(torture_knownhosts_conflict, setup, teardown),
+        unit_test_setup_teardown(torture_knownhosts_precheck, setup, teardown)
     };
 
     ssh_init();

tests/test_ssh_bind_accept_fd.c

@@ -0,0 +1,139 @@
+/* Test the ability to use ssh_bind_accept_fd.
+ *
+ * Expected behavior: Prints "SUCCESS!"
+ *
+ * Faulty behavior observed before change: Connection timeout
+ */
+
+#include <arpa/inet.h>
+#include <err.h>
+#include <libssh/libssh.h>
+#include <libssh/server.h>
+#include <netinet/in.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+struct options {
+  const char *server_keyfile;
+} options;
+
+const char HOST[] = "127.0.0.1";
+const int PORT = 3333;
+
+int get_connection() {
+  int rc, server_socket, client_conn = -1;
+  struct sockaddr_in server_socket_addr;
+  struct sockaddr_storage client_conn_addr;
+  socklen_t client_conn_addr_size = sizeof(client_conn_addr);
+
+  server_socket = socket(PF_INET, SOCK_STREAM, 0);
+  if (server_socket < 0) {
+    goto out;
+  }
+
+  server_socket_addr.sin_family = AF_INET;
+  server_socket_addr.sin_port = htons(PORT);
+  if (inet_pton(AF_INET, HOST, &server_socket_addr.sin_addr) != 1) {
+    goto out;
+  }
+
+  rc = bind(server_socket, (struct sockaddr *)&server_socket_addr,
+            sizeof(server_socket_addr));
+  if (rc < 0) {
+    goto out;
+  }
+
+  if (listen(server_socket, 0) < 0) {
+    goto out;
+  }
+
+  client_conn = accept(server_socket,
+                       (struct sockaddr *)&client_conn_addr,
+                       &client_conn_addr_size);
+
+ out:
+  return client_conn;
+}
+
+void ssh_server() {
+  ssh_bind bind;
+  ssh_session session;
+
+  int client_conn = get_connection();
+  if (client_conn < 0) {
+    err(1, "get_connection");
+  }
+
+  bind = ssh_bind_new();
+  if (!bind) {
+    errx(1, "ssh_bind_new");
+  }
+
+  if (ssh_bind_options_set(bind, SSH_BIND_OPTIONS_DSAKEY,
+                           options.server_keyfile) != SSH_OK) {
+    errx(1, "ssh_bind_options_set(SSH_BIND_OPTIONS_DSAKEY");
+  }
+
+  session = ssh_new();
+  if (!session) {
+    errx(1, "ssh_new");
+  }
+
+  if (ssh_bind_accept_fd(bind, session, client_conn) != SSH_OK) {
+    errx(1, "ssh_bind_accept: %s", ssh_get_error(bind));
+  }
+
+  if (ssh_handle_key_exchange(session) != SSH_OK) {
+    errx(1, "ssh_handle_key_exchange: %s", ssh_get_error(session));
+  }
+
+  printf("SUCCESS!\n");
+}
+
+void ssh_client() {
+  ssh_session session;
+
+  session = ssh_new();
+  if (!session) {
+    errx(1, "ssh_new");
+  }
+
+  if (ssh_options_set(session, SSH_OPTIONS_HOST, HOST) < 0) {
+    errx(1, "ssh_options_set(SSH_OPTIONS_HOST)");
+  }
+  if (ssh_options_set(session, SSH_OPTIONS_PORT, &PORT) < 0) {
+    errx(1, "ssh_options_set(SSH_OPTIONS_PORT)");
+  }
+
+  if (ssh_connect(session) != SSH_OK) {
+    errx(1, "ssh_connect: %s", ssh_get_error(session));
+  }
+}
+
+int main(int argc, const char *argv[]) {
+  if (argc != 2) {
+    printf("Usage: %s <private key file>\n", argv[0]);
+    exit(1);
+  }
+
+  options.server_keyfile = argv[1];
+
+  pid_t pid = fork();
+  if (pid < 0) {
+    errx(1, "fork");
+  }
+  if (pid == 0) {
+    /* Allow the server to get set up */
+    sleep(3);
+
+    ssh_client();
+  } else {
+    ssh_server();
+  }
+
+  return 0;
+}