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Ignore early data app msg before 2nd client hello

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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 2023-11-15 16:40:09 +08:00 committed by Ronald Cron
parent 263dbf7167
commit f57d14bed4
3 changed files with 53 additions and 3 deletions
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26
library/ssl_msg.c
View File

@ -4109,6 +4109,32 @@ static int ssl_prepare_record_content(mbedtls_ssl_context *ssl,
}
#if defined(MBEDTLS_SSL_EARLY_DATA) && defined(MBEDTLS_SSL_SRV_C)
/*
* Although the server rejected early data because it needed to send an
* HelloRetryRequest message, it might receive early data as long as it has
* not received the client Finished message.
* The early data is encrypted with early keys and should be ignored as
* stated in section 4.2.10 of RFC 8446 (second case):
*
* "The server then ignores early data by skipping all records with an
* external content type of "application_data" (indicating that they are
* encrypted), up to the configured max_early_data_size. Ignore application
* data message before 2nd ClientHello when early_data was received in 1st
* ClientHello."
*/
if (ssl->discard_early_data_record == MBEDTLS_SSL_EARLY_DATA_DISCARD) {
if (rec->type == MBEDTLS_SSL_MSG_APPLICATION_DATA) {
MBEDTLS_SSL_DEBUG_MSG(
3, ("EarlyData: Ignore application message before 2nd ClientHello"));
/* TODO: Add max_early_data_size check here. */
return MBEDTLS_ERR_SSL_CONTINUE_PROCESSING;
} else if (rec->type == MBEDTLS_SSL_MSG_HANDSHAKE) {
ssl->discard_early_data_record = MBEDTLS_SSL_EARLY_DATA_NO_DISCARD;
}
}
#endif /* MBEDTLS_SSL_EARLY_DATA && MBEDTLS_SSL_SRV_C */
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
mbedtls_ssl_dtls_replay_update(ssl);

3
tests/suites/test_suite_ssl.data
View File

@ -3279,3 +3279,6 @@ tls13_early_data:"reference"
TLS 1.3 early data, deprotect and discard
tls13_early_data:"deprotect and discard"
TLS 1.3 early data, discard after HRR
tls13_early_data:"discard after HRR"

27
tests/suites/test_suite_ssl.function
View File

@ -3674,6 +3674,11 @@ void tls13_early_data(char *scenario_string)
mbedtls_test_handshake_test_options server_options;
mbedtls_ssl_session saved_session;
mbedtls_test_ssl_log_pattern server_pattern = { NULL, 0 };
uint16_t group_list[3] = {
MBEDTLS_SSL_IANA_TLS_GROUP_SECP256R1,
MBEDTLS_SSL_IANA_TLS_GROUP_SECP384R1,
MBEDTLS_SSL_IANA_TLS_GROUP_NONE
};
/*
* Determine scenario.
@ -3682,6 +3687,8 @@ void tls13_early_data(char *scenario_string)
scenario = 0;
} else if (strcmp(scenario_string, "deprotect and discard") == 0) {
scenario = 1;
} else if (strcmp(scenario_string, "discard after HRR") == 0) {
scenario = 2;
} else {
TEST_FAIL("Unknown scenario.");
}
@ -3700,7 +3707,7 @@ void tls13_early_data(char *scenario_string)
client_options.pk_alg = MBEDTLS_PK_ECDSA;
ret = mbedtls_test_ssl_endpoint_init(&client_ep, MBEDTLS_SSL_IS_CLIENT,
&client_options, NULL, NULL, NULL,
NULL);
group_list);
TEST_EQUAL(ret, 0);
mbedtls_ssl_conf_early_data(&client_ep.conf, MBEDTLS_SSL_EARLY_DATA_ENABLED);
@ -3709,7 +3716,7 @@ void tls13_early_data(char *scenario_string)
server_options.srv_log_obj = &server_pattern;
ret = mbedtls_test_ssl_endpoint_init(&server_ep, MBEDTLS_SSL_IS_SERVER,
&server_options, NULL, NULL, NULL,
NULL);
group_list);
TEST_EQUAL(ret, 0);
mbedtls_ssl_conf_early_data(&server_ep.conf, MBEDTLS_SSL_EARLY_DATA_ENABLED);
mbedtls_ssl_conf_session_tickets_cb(&server_ep.conf,
@ -3763,6 +3770,19 @@ void tls13_early_data(char *scenario_string)
mbedtls_ssl_conf_early_data(&server_ep.conf,
MBEDTLS_SSL_EARLY_DATA_DISABLED);
break;
case 2: /* discard after HRR */
mbedtls_debug_set_threshold(3);
server_pattern.pattern =
"EarlyData: Ignore application message before 2nd ClientHello";
mbedtls_ssl_conf_groups(&server_ep.conf, group_list + 1);
/*
* Need to reset again to reconstruct the group list in the
* handshake structure from the configured one.
*/
ret = mbedtls_ssl_session_reset(&(server_ep.ssl));
TEST_EQUAL(ret, 0);
break;
}
TEST_EQUAL(mbedtls_test_move_handshake_to_state(
@ -3793,7 +3813,8 @@ void tls13_early_data(char *scenario_string)
MBEDTLS_SSL_HANDSHAKE_WRAPUP), 0);
break;
case 1:
case 1: /* Intentional fallthrough */
case 2:
TEST_EQUAL(ret, 0);
TEST_EQUAL(server_ep.ssl.handshake->early_data_accepted, 0);
TEST_EQUAL(server_pattern.counter, 1);