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Fix bug in TLS authentication ("Daniel P. Berrange")

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This patch was previously posted here:

  http://lists.gnu.org/archive/html/qemu-devel/2009-02/msg00820.html

In the case where the TLS handshake does *not* block on I/O, QEMU
sends the next 'start sub-auth' message twice. This seriously confuses
the VNC client :-) Fortunately the chances of the handshake not blocking
are close to zero for a TCP socket, which is why it has not been noticed
thus far. Even with both client & server on localhost, I can only hit the
bug 1 time in 20.

NB, the diff context here is not too informative. If you look at the
full code you'll see that a few lines early we called vnc_start_tls()
which called vnc_continue_handshake() which called the method
start_auth_vencrypt_subauth(). Hence, fixing the bug, just involves
removing the 2nd bogus call to start_auth_vencrypt_subauth() as per
this patch.


 vnc.c |    8 --------
 1 file changed, 8 deletions(-)

   Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6719 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-03-06 20:27:02 +00:00
parent 8a34a0fb03
commit adc5ec856c
1 changed files with 0 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
vnc.c
View File

@ -2098,14 +2098,6 @@ static int protocol_client_vencrypt_auth(VncState *vs, uint8_t *data, size_t len
VNC_DEBUG("Failed to complete TLS\n"); VNC_DEBUG("Failed to complete TLS\n");
return 0; return 0;
} }
if (vs->wiremode == VNC_WIREMODE_TLS) {
VNC_DEBUG("Starting VeNCrypt subauth\n");
return start_auth_vencrypt_subauth(vs);
} else {
VNC_DEBUG("TLS handshake blocked\n");
return 0;
}
} }
return 0; return 0;
} }