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Tighten session ticket handling

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Tighten client-side session ticket handling during renegotiation:
ensure that the client only accepts a session ticket if the server sends
the extension anew in the ServerHello. Previously, a TLS client would
reuse the old extension state and thus accept a session ticket if one was
announced in the initial ServerHello.

Reviewed-by: Bodo Moeller <bodo@openssl.org>
This commit is contained in:
Emilia Kasper 2014-10-28 17:35:59 +01:00
parent 49b0dfc502
commit d663df2399
3 changed files with 40 additions and 2 deletions
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16
CHANGES
View File

@ -305,6 +305,13 @@
Changes between 1.0.1j and 1.0.2 [xx XXX xxxx]
*) Tighten client-side session ticket handling during renegotiation:
ensure that the client only accepts a session ticket if the server sends
the extension anew in the ServerHello. Previously, a TLS client would
reuse the old extension state and thus accept a session ticket if one was
announced in the initial ServerHello.
[Emilia Käsper]
*) Accelerated NIST P-256 elliptic curve implementation for x86_64
(other platforms pending).
[Shay Gueron & Vlad Krasnov (Intel Corp), Andy Polyakov]
@ -625,6 +632,15 @@
X509_CINF_set_modified, X509_CINF_get_issuer, X509_CINF_get_extensions and
X509_CINF_get_signature were reverted post internal team review.
Changes between 1.0.1j and 1.0.1k [xx XXX xxxx]
*) Tighten client-side session ticket handling during renegotiation:
ensure that the client only accepts a session ticket if the server sends
the extension anew in the ServerHello. Previously, a TLS client would
reuse the old extension state and thus accept a session ticket if one was
announced in the initial ServerHello.
[Emilia Käsper]
Changes between 1.0.1i and 1.0.1j [15 Oct 2014]
*) SRTP Memory Leak.

10
ssl/s3_clnt.c
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@ -225,6 +225,14 @@ int ssl3_connect(SSL *s)
s->renegotiate=1;
s->state=SSL_ST_CONNECT;
s->ctx->stats.sess_connect_renegotiate++;
#ifndef OPENSSL_NO_TLSEXT
/*
* If renegotiating, the server may choose to not issue
* a new ticket, so reset the flag. It will be set to
* the right value when parsing ServerHello extensions.
*/
s->tlsext_ticket_expected = 0;
#endif
/* break */
case SSL_ST_BEFORE:
case SSL_ST_CONNECT:
@ -2351,7 +2359,7 @@ int ssl3_get_new_session_ticket(SSL *s)
}
memcpy(s->session->tlsext_tick, p, ticklen);
s->session->tlsext_ticklen = ticklen;
/* There are two ways to detect a resumed ticket sesion.
/* There are two ways to detect a resumed ticket session.
* One is to set an appropriate session ID and then the server
* must return a match in ServerHello. This allows the normal
* client session ID matching to work and we know much

16
ssl/ssl_sess.c
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@ -340,7 +340,21 @@ int ssl_get_new_session(SSL *s, int session)
return(0);
}
#ifndef OPENSSL_NO_TLSEXT
/* If RFC4507 ticket use empty session ID */
/*
* If RFC5077 ticket, use empty session ID (as server).
* Note that:
* (a) ssl_get_prev_session() does lookahead into the
* ClientHello extensions to find the session ticket.
* When ssl_get_prev_session() fails, s3_srvr.c calls
* ssl_get_new_session() in ssl3_get_client_hello().
* At that point, it has not yet parsed the extensions,
* however, because of the lookahead, it already knows
* whether a ticket is expected or not.
*
* (b) s3_clnt.c calls ssl_get_new_session() before parsing
* ServerHello extensions, and before recording the session
* ID received from the server, so this block is a noop.
*/
if (s->tlsext_ticket_expected)
{
ss->session_id_length = 0;