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tls13: srv: Fail connection if ticket lifetime exceed 7 days

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Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Jerry Yu 2023-11-22 15:01:18 +08:00 committed by Ronald Cron
parent 97dfc726f3
commit ce79488dd5
3 changed files with 61 additions and 10 deletions
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14
include/mbedtls/ssl_ticket.h
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@ -111,6 +111,13 @@ void mbedtls_ssl_ticket_init(mbedtls_ssl_ticket_context *ctx);
* \note It is recommended to pick a reasonable lifetime so as not
* to negate the benefits of forward secrecy.
*
* \note The TLS 1.3 specification states that ticket lifetime must
* be smaller than seven days. If ticket lifetime has been
* set to a value greater than seven days in this module then
* if the TLS 1.3 is configured to send tickets after the
* handshake it will fail the connection when trying to send
* the first ticket.
*
* \return 0 if successful,
* or a specific MBEDTLS_ERR_XXX error code
*/
@ -147,6 +154,13 @@ int mbedtls_ssl_ticket_setup(mbedtls_ssl_ticket_context *ctx,
* \note It is recommended to pick a reasonable lifetime so as not
* to negate the benefits of forward secrecy.
*
* \note The TLS 1.3 specification states that ticket lifetime must
* be smaller than seven days. If ticket lifetime has been
* set to a value greater than seven days in this module then
* if the TLS 1.3 is configured to send tickets after the
* handshake it will fail the connection when trying to send
* the first ticket.
*
* \return 0 if successful,
* or a specific MBEDTLS_ERR_XXX error code
*/

21
library/ssl_tls13_server.c
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@ -3271,20 +3271,21 @@ static int ssl_tls13_write_new_session_ticket_body(mbedtls_ssl_context *ssl,
MBEDTLS_SSL_DEBUG_RET(1, "write_ticket", ret);
return ret;
}
/* RFC 8446 4.6.1
/* RFC 8446 section 4.6.1
*
* ticket_lifetime: Indicates the lifetime in seconds as a 32-bit
* unsigned integer in network byte order from the time of ticket
* issuance. Servers MUST NOT use any value greater than
* 604800 seconds (7 days). The value of zero indicates that the
* ticket should be discarded immediately. Clients MUST NOT cache
* tickets for longer than 7 days, regardless of the ticket_lifetime,
* and MAY delete tickets earlier based on local policy. A server
* MAY treat a ticket as valid for a shorter period of time than what
* is stated in the ticket_lifetime.
* unsigned integer in network byte order from the time of ticket
* issuance. Servers MUST NOT use any value greater than
* 604800 seconds (7 days) ...
*/
if (ticket_lifetime > MBEDTLS_SSL_TLS1_3_MAX_ALLOWED_TICKET_LIFETIME) {
ticket_lifetime = MBEDTLS_SSL_TLS1_3_MAX_ALLOWED_TICKET_LIFETIME;
MBEDTLS_SSL_DEBUG_MSG(
1, ("Ticket lifetime (%u) is greater than 7 days.",
(unsigned int) ticket_lifetime));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
MBEDTLS_PUT_UINT32_BE(ticket_lifetime, p, 0);
MBEDTLS_SSL_DEBUG_MSG(3, ("ticket_lifetime: %u",
(unsigned int) ticket_lifetime));

36
tests/ssl-opt.sh
View File

@ -13532,6 +13532,42 @@ run_test "TLS 1.3: NewSessionTicket: Basic check, m->m" \
-s "key exchange mode: psk_ephemeral" \
-s "found pre_shared_key extension"
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 max value (7d)" \
"$P_SRV debug_level=1 crt_file=data_files/server5.crt key_file=data_files/server5.key ticket_timeout=604800 tickets=1" \
"$P_CLI reco_mode=1 reconnect=1" \
0 \
-c "Protocol is TLSv1.3" \
-c "HTTP/1.0 200 OK" \
-c "got new session ticket" \
-c "Reconnecting with saved session... ok" \
-s "Protocol is TLSv1.3" \
-S "Ticket lifetime (604800) 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 too long (7d + 1s)" \
"$P_SRV debug_level=1 crt_file=data_files/server5.crt key_file=data_files/server5.key ticket_timeout=604801 tickets=1" \
"$P_CLI reco_mode=1 reconnect=1" \
1 \
-c "Protocol is TLSv1.3" \
-C "HTTP/1.0 200 OK" \
-C "got new session ticket" \
-C "Reconnecting with saved session... ok" \
-S "Protocol is TLSv1.3" \
-s "Ticket lifetime (604801) is greater than 7 days."
requires_openssl_tls1_3_with_compatible_ephemeral
requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_2
requires_config_enabled MBEDTLS_DEBUG_C