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Ensure last_write_sequence is saved in DTLS1.2

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In DTLS, immediately prior to epoch change, the write_sequence is supposed
to be stored in s->d1->last_write_sequence. The write_sequence is then reset
back to 00000000. In the event of retransmits of records from the previous
epoch, the last_write_sequence is restored. This commit fixes a bug in
DTLS1.2 where the write_sequence was being reset before last_write_sequence
was saved, and therefore retransmits are sent with incorrect sequence
numbers.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit d5d0a1cb1347d4a8547e78aec56c50c528186e50)
This commit is contained in:
Matt Caswell 2015-02-05 13:54:37 +00:00
parent fe82be2b33
commit 4285b85163
1 changed files with 4 additions and 4 deletions
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8
ssl/t1_enc.c
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@ -404,9 +404,9 @@ int tls1_change_cipher_state(SSL *s, int which)
}
#endif
/*
* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION
* this is done by dtls1_reset_seq_numbers for DTLS
*/
if (s->version != DTLS1_VERSION)
if (!SSL_IS_DTLS(s))
memset(&(s->s3->read_sequence[0]), 0, 8);
mac_secret = &(s->s3->read_mac_secret[0]);
mac_secret_size = &(s->s3->read_mac_secret_size);
@ -442,9 +442,9 @@ int tls1_change_cipher_state(SSL *s, int which)
}
#endif
/*
* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION
* this is done by dtls1_reset_seq_numbers for DTLS
*/
if (s->version != DTLS1_VERSION)
if (!SSL_IS_DTLS(s))
memset(&(s->s3->write_sequence[0]), 0, 8);
mac_secret = &(s->s3->write_mac_secret[0]);
mac_secret_size = &(s->s3->write_mac_secret_size);