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tls13: cli: Discard ticket with zero lifetime

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Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron 2024-03-08 17:51:23 +01:00
parent ce79488dd5
commit 9422725aba
2 changed files with 59 additions and 10 deletions
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48
library/ssl_tls13_client.c
View File

@ -2916,12 +2916,17 @@ static int ssl_tls13_parse_new_session_ticket(mbedtls_ssl_context *ssl,
return ret;
}
/* session has been updated, allow export */
session->exported = 0;
return 0;
}
/* Non negative return values for ssl_tls13_postprocess_new_session_ticket().
* - POSTPROCESS_NEW_SESSION_TICKET_SIGNAL, all good, we have to signal the
* application that a valid ticket has been received.
* - POSTPROCESS_NEW_SESSION_TICKET_DISCARD, no fatal error, we keep the
* connection alive but we do not signal the ticket to the application.
*/
#define POSTPROCESS_NEW_SESSION_TICKET_SIGNAL 0
#define POSTPROCESS_NEW_SESSION_TICKET_DISCARD 1
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_tls13_postprocess_new_session_ticket(mbedtls_ssl_context *ssl,
unsigned char *ticket_nonce,
@ -2933,6 +2938,10 @@ static int ssl_tls13_postprocess_new_session_ticket(mbedtls_ssl_context *ssl,
psa_algorithm_t psa_hash_alg;
int hash_length;
if (session->ticket_lifetime == 0) {
return POSTPROCESS_NEW_SESSION_TICKET_DISCARD;
}
#if defined(MBEDTLS_HAVE_TIME)
/* Store ticket creation time */
session->ticket_reception_time = mbedtls_ms_time();
@ -2989,7 +2998,7 @@ static int ssl_tls13_postprocess_new_session_ticket(mbedtls_ssl_context *ssl,
session, ssl->conf->tls13_kex_modes);
MBEDTLS_SSL_PRINT_TICKET_FLAGS(4, session->ticket_flags);
return 0;
return POSTPROCESS_NEW_SESSION_TICKET_SIGNAL;
}
/*
@ -3010,13 +3019,38 @@ static int ssl_tls13_process_new_session_ticket(mbedtls_ssl_context *ssl)
ssl, MBEDTLS_SSL_HS_NEW_SESSION_TICKET,
&buf, &buf_len));
/*
* We are about to update (maybe only partially) ticket data thus block
* any session export for the time being.
*/
ssl->session->exported = 1;
MBEDTLS_SSL_PROC_CHK(ssl_tls13_parse_new_session_ticket(
ssl, buf, buf + buf_len,
&ticket_nonce, &ticket_nonce_len));
MBEDTLS_SSL_PROC_CHK(ssl_tls13_postprocess_new_session_ticket(
MBEDTLS_SSL_PROC_CHK_NEG(ssl_tls13_postprocess_new_session_ticket(
ssl, ticket_nonce, ticket_nonce_len));
switch (ret) {
case POSTPROCESS_NEW_SESSION_TICKET_SIGNAL:
/*
* All good, we have received a new valid ticket, session data can
* be exported now and we signal the ticket to the application.
*/
ssl->session->exported = 0;
ret = MBEDTLS_ERR_SSL_RECEIVED_NEW_SESSION_TICKET;
break;
case POSTPROCESS_NEW_SESSION_TICKET_DISCARD:
ret = 0;
MBEDTLS_SSL_DEBUG_MSG(2, ("Discard new session ticket"));
break;
default:
ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
}
mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_HANDSHAKE_OVER);
cleanup:
@ -3132,10 +3166,6 @@ int mbedtls_ssl_tls13_handshake_client_step(mbedtls_ssl_context *ssl)
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
case MBEDTLS_SSL_TLS1_3_NEW_SESSION_TICKET:
ret = ssl_tls13_process_new_session_ticket(ssl);
if (ret != 0) {
break;
}
ret = MBEDTLS_ERR_SSL_RECEIVED_NEW_SESSION_TICKET;
break;
#endif /* MBEDTLS_SSL_SESSION_TICKETS */

19
tests/ssl-opt.sh
View File

@ -13568,6 +13568,25 @@ run_test "TLS 1.3 m->m: NewSessionTicket: Ticket lifetime too long (7d + 1s)"
-S "Protocol is TLSv1.3" \
-s "Ticket lifetime (604801) is greater than 7 days."
requires_all_configs_enabled MBEDTLS_SSL_PROTO_TLS1_3 \
MBEDTLS_SSL_CLI_C MBEDTLS_SSL_SRV_C \
MBEDTLS_SSL_SESSION_TICKETS MBEDTLS_HAVE_TIME \
MBEDTLS_DEBUG_C \
MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED
requires_any_configs_enabled MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_ENABLED \
MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL_ENABLED
run_test "TLS 1.3 m->m: NewSessionTicket: ticket lifetime=0" \
"$P_SRV debug_level=2 crt_file=data_files/server5.crt key_file=data_files/server5.key ticket_timeout=0 tickets=1" \
"$P_CLI debug_level=2 reco_mode=1 reconnect=1" \
1 \
-c "Protocol is TLSv1.3" \
-c "HTTP/1.0 200 OK" \
-c "Discard new session ticket" \
-C "got new session ticket" \
-c "Reconnecting with saved session... failed" \
-s "Protocol is TLSv1.3" \
-s "<= write new session ticket"
requires_openssl_tls1_3_with_compatible_ephemeral
requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_2
requires_config_enabled MBEDTLS_DEBUG_C