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Don't check for padding bug if compression is negotiated.

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PR: 1204
This commit is contained in:
Dr. Stephen Henson 2006-05-07 12:27:48 +00:00
parent 1b6b67b17e
commit b723a7b11b
2 changed files with 16 additions and 2 deletions
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8
CHANGES
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@ -4,7 +4,13 @@
Changes between 0.9.8b and 0.9.8c [xx XXX xxxx]
*)
*) Disable the padding bug check when compression is in use. The padding
bug check assumes the first packet is of even length, this is not
necessarily true if compresssion is enabled and can result in false
positives causing handshake failure. The actual bug test is ancient
code so it is hoped that implementations will either have fixed it by
now or any which still have the bug do not support compression.
[Steve Henson]
Changes between 0.9.8a and 0.9.8b [04 May 2006]

10
ssl/t1_enc.c
View file

@ -628,7 +628,15 @@ int tls1_enc(SSL *s, int send)
{
ii=i=rec->data[l-1]; /* padding_length */
i++;
if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
/* NB: if compression is in operation the first packet
* may not be of even length so the padding bug check
* cannot be performed. This bug workaround has been
* around since SSLeay so hopefully it is either fixed
* now or no buggy implementation supports compression
* [steve]
*/
if ( (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
&& !s->expand)
{
/* First packet is even in size, so check */
if ((memcmp(s->s3->read_sequence,