On 32b architecture when processing the SFTP packets, the value
0x7ffffffc in the payload_len will overflow to negative integer values,
causing these checks to pass and possibly reading behind the buffer
bounds later.
This affects only SFTP server implementations running on 32b
architecture.
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
Set maximum input to 256MB to have safe margin to the 1GB trigger point
for 32b arch.
The OOB should not be reachable by any internal code paths as most of
the buffers and strings we use as input for this operation already have
similar limit and none really allows this much of data.
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit 00f09acbec)
Some SFTP servers (Cisco) do not implement the v3 protocol correctly and do not
send the mandatory part of the status message. This falls back to the v2
behavior when the error message and language tag are not provided.
Fixes: #272
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Sahana Prasad <sahana@redhat.com>
(cherry picked from commit 0306581f1c)
Originally reported by Till on mailing list here:
https://archive.libssh.org/libssh/2025-05/0000000.html
After some debugging, it turns out the client code does not guarantee
the extensions are processed before making decisions on the signature algorithm
that is being used for authentication, causing false-positive failures.
This does not happen in the tests, where we initially call ssh_userauth_none,
which enumerates authentications methods and as a side effect processes
outstanding packets such as SSH_EXT_INFO message with the server-sig-algs
extension.
When the first function called after `ssh_connect()` is
`ssh_userauth_publickey()`, the `ssh_userauth_request_service()` was wrongly
called only after the signature algorithm compatibility was checked.
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Norbert Pocs <norbertpocs0@gmail.com>
(cherry picked from commit 12baa5200a)
This implements stub for the compression functions and includes the
gzip.c in the compilation target uncoditionally, keeping the WITH_ZLIB
conditional compilation only in the gzip.c
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit 0cd749a533)
to avoid exposing gzip function into wrapper.c
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit 00fce9cb6c)
When the user frees the channel, they no longer expect any callbacks
to be triggered on it. When we delay the close before we receive
the remaining messages, we should not trigger the user callbacks
as it might be already freed.
I believe this is the random torture_session test failures and
errors we are getting from valgrind from time to time.
We keep the callbacks cleanup in the do_cleanup() in case the
calling application sets the callback after free for some reason.
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit 79ba546cde)
The "sane" default is now based on the man stty "sane" alias with addition of
utf8.
Fixes: #270
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit 48d474f78c)
For some reason, both compress and decompress contexts were terminated
with both compress and decompress end functions (if the deflateEnd worked),
which was causing for some another unexplained reasons issues on i686
architecture when running the torture_packet unit test.
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit c9cfeb9b83)
This is more portable than specifying a compiler flag explicitly.
Signed-off-by: James Wrigley <james@puiterwijk.org>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
(cherry picked from commit 7e4ea0d111)
Some architectures (esp32) might not have this API.
Fixes: #263
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit 9634668258)
This removes the code reported by the following coverity issue:
*** CID 1548867: Insecure data handling (INTEGER_OVERFLOW)
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Sahana Prasad <sahana@redhat.com>
Reviewed-by: Eshan Kelkar <eshankelkar@galorithm.com>
The coverity thinks the best_nlines could be 0 for logging at the end of the
function. It is obvious that the 0 is immediately incremented. Changing the code
to do this in one step to make it easier to understand for static analyzers.
** CID 1548873: Integer handling issues (INTEGER_OVERFLOW)
Thanks coverity
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Sahana Prasad <sahana@redhat.com>
Reviewed-by: Eshan Kelkar <eshankelkar@galorithm.com>
