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Only call ssl3_init_finished_mac once for DTLS

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In DTLS if an IO retry occurs during writing of a fragmented ClientHello
then we can end up reseting the finish mac variables on the retry, which
causes a handshake failure. We should only reset on the first attempt not
on retries.

Thanks to BoringSSL for reporting this issue.

RT#4119

Reviewed-by: Tim Hudson <tjh@openssl.org>
This commit is contained in:
Matt Caswell 2015-11-03 15:49:08 +00:00
parent 822d265ced
commit 15a7164eb7
1 changed files with 1 additions and 2 deletions
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3
ssl/d1_clnt.c
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@ -317,13 +317,12 @@ int dtls1_connect(SSL *s)
#endif
case SSL3_ST_CW_CLNT_HELLO_A:
case SSL3_ST_CW_CLNT_HELLO_B:
s->shutdown = 0;
/* every DTLS ClientHello resets Finished MAC */
ssl3_init_finished_mac(s);
case SSL3_ST_CW_CLNT_HELLO_B:
dtls1_start_timer(s);
ret = ssl3_client_hello(s);
if (ret <= 0)