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Add an anti-replay mechanism

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If the server is configured to allow early data then we check if the PSK
session presented by the client is available in the cache or not. If it
isn't then this may be a replay and we disallow it. If it is then we allow
it and remove the session from the cache. Note: the anti-replay protection
is not used for externally established PSKs.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5644)
This commit is contained in:
Matt Caswell 2018-03-16 09:25:34 +00:00
parent f023ba2df8
commit 66d7de1634
2 changed files with 11 additions and 3 deletions
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6
ssl/ssl_sess.c
View File

@ -761,10 +761,10 @@ static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
if ((c != NULL) && (c->session_id_length != 0)) {
if (lck)
CRYPTO_THREAD_write_lock(ctx->lock);
if ((r = lh_SSL_SESSION_retrieve(ctx->sessions, c)) == c) {
if ((r = lh_SSL_SESSION_retrieve(ctx->sessions, c)) != NULL) {
ret = 1;
r = lh_SSL_SESSION_delete(ctx->sessions, c);
SSL_SESSION_list_remove(ctx, c);
r = lh_SSL_SESSION_delete(ctx->sessions, r);
SSL_SESSION_list_remove(ctx, r);
}
c->not_resumable = 1;

8
ssl/statem/extensions_srvr.c
View File

@ -1134,6 +1134,14 @@ int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
if (ret == SSL_TICKET_NO_DECRYPT)
continue;
/* Check for replay */
if (s->max_early_data > 0
&& !SSL_CTX_remove_session(s->session_ctx, sess)) {
SSL_SESSION_free(sess);
sess = NULL;
continue;
}
ticket_age = (uint32_t)ticket_agel;
now = (uint32_t)time(NULL);
agesec = now - (uint32_t)sess->time;