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tls13: Use a flag not a counter for CCS and HRR handling

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Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron 2024-02-14 10:03:36 +01:00
parent e273f7203d
commit 5fbd27055d
5 changed files with 25 additions and 20 deletions
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17
library/ssl_misc.h
View File

@ -730,16 +730,21 @@ struct mbedtls_ssl_handshake_params {
#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
uint8_t key_exchange_mode; /*!< Selected key exchange mode */
/** Number of HelloRetryRequest messages received/sent from/to the server. */
uint8_t hello_retry_request_count;
/**
* Flag indicating if, in the course of the current handshake, an
* HelloRetryRequest message has been sent by the server or received by
* the client (<> 0) or not (0).
*/
uint8_t hello_retry_request_flag;
#if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE)
/**
* Number of dummy change_cipher_spec (CCS) record sent. Used to send only
* one CCS per handshake without having to complicate the handshake state
* transitions.
* Flag indicating if, in the course of the current handshake, a dummy
* change_cipher_spec (CCS) record has already been sent. Used to send only
* one CCS per handshake while not complicating the handshake state
* transitions for that purpose.
*/
uint8_t ccs_count;
uint8_t ccs_sent;
#endif
#if defined(MBEDTLS_SSL_SRV_C)

8
library/ssl_tls13_client.c
View File

@ -1180,7 +1180,7 @@ int mbedtls_ssl_tls13_write_client_hello_exts(mbedtls_ssl_context *ssl,
#endif
#if defined(MBEDTLS_SSL_EARLY_DATA)
if (ssl->handshake->hello_retry_request_count == 0) {
if (!ssl->handshake->hello_retry_request_flag) {
if (mbedtls_ssl_conf_tls13_is_some_psk_enabled(ssl) &&
ssl_tls13_early_data_has_valid_ticket(ssl) &&
ssl->conf->early_data_enabled == MBEDTLS_SSL_EARLY_DATA_ENABLED) {
@ -1497,7 +1497,7 @@ static int ssl_tls13_preprocess_server_hello(mbedtls_ssl_context *ssl,
* to a HelloRetryRequest), it MUST abort the handshake with an
* "unexpected_message" alert.
*/
if (handshake->hello_retry_request_count > 0) {
if (handshake->hello_retry_request_flag) {
MBEDTLS_SSL_DEBUG_MSG(1, ("Multiple HRRs received"));
MBEDTLS_SSL_PEND_FATAL_ALERT(
MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE,
@ -1519,7 +1519,7 @@ static int ssl_tls13_preprocess_server_hello(mbedtls_ssl_context *ssl,
return MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER;
}
handshake->hello_retry_request_count++;
handshake->hello_retry_request_flag = 1;
break;
}
@ -1674,7 +1674,7 @@ static int ssl_tls13_parse_server_hello(mbedtls_ssl_context *ssl,
* proposed in the HRR, we abort the handshake and send an
* "illegal_parameter" alert.
*/
else if ((!is_hrr) && (handshake->hello_retry_request_count > 0) &&
else if ((!is_hrr) && handshake->hello_retry_request_flag &&
(cipher_suite != ssl->session_negotiate->ciphersuite)) {
fatal_alert = MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER;
}

4
library/ssl_tls13_generic.c
View File

@ -1380,7 +1380,7 @@ int mbedtls_ssl_tls13_write_change_cipher_spec(mbedtls_ssl_context *ssl)
MBEDTLS_SSL_DEBUG_MSG(2, ("=> write change cipher spec"));
/* Only one CCS to send. */
if (ssl->handshake->ccs_count > 0) {
if (ssl->handshake->ccs_sent) {
ret = 0;
goto cleanup;
}
@ -1396,7 +1396,7 @@ int mbedtls_ssl_tls13_write_change_cipher_spec(mbedtls_ssl_context *ssl)
/* Dispatch message */
MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_write_record(ssl, 0));
ssl->handshake->ccs_count++;
ssl->handshake->ccs_sent = 1;
cleanup:

6
library/ssl_tls13_server.c
View File

@ -1535,7 +1535,7 @@ static int ssl_tls13_parse_client_hello(mbedtls_ssl_context *ssl,
const unsigned char *extension_data_end;
uint32_t allowed_exts = MBEDTLS_SSL_TLS1_3_ALLOWED_EXTS_OF_CH;
if (ssl->handshake->hello_retry_request_count > 0) {
if (ssl->handshake->hello_retry_request_flag) {
/* Do not accept early data extension in 2nd ClientHello */
allowed_exts &= ~MBEDTLS_SSL_EXT_MASK(EARLY_DATA);
}
@ -2431,7 +2431,7 @@ MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_tls13_prepare_hello_retry_request(mbedtls_ssl_context *ssl)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if (ssl->handshake->hello_retry_request_count > 0) {
if (ssl->handshake->hello_retry_request_flag) {
MBEDTLS_SSL_DEBUG_MSG(1, ("Too many HRRs"));
MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE,
MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE);
@ -2478,7 +2478,7 @@ static int ssl_tls13_write_hello_retry_request(mbedtls_ssl_context *ssl)
MBEDTLS_SSL_PROC_CHK(mbedtls_ssl_finish_handshake_msg(ssl, buf_len,
msg_len));
ssl->handshake->hello_retry_request_count++;
ssl->handshake->hello_retry_request_flag = 1;
#if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE)
/* The server sends a dummy change_cipher_spec record immediately

10
tests/suites/test_suite_ssl.function
View File

@ -3903,7 +3903,7 @@ void tls13_cli_early_data_status(int scenario)
break;
case TEST_EARLY_DATA_HRR:
if (client_ep.ssl.handshake->hello_retry_request_count == 0) {
if (!client_ep.ssl.handshake->hello_retry_request_flag) {
TEST_EQUAL(client_ep.ssl.early_data_status,
MBEDTLS_SSL_EARLY_DATA_STATUS_UNKNOWN);
} else {
@ -3928,7 +3928,7 @@ void tls13_cli_early_data_status(int scenario)
break;
case TEST_EARLY_DATA_HRR:
if (client_ep.ssl.handshake->hello_retry_request_count == 0) {
if (!client_ep.ssl.handshake->hello_retry_request_flag) {
TEST_EQUAL(client_ep.ssl.early_data_status,
MBEDTLS_SSL_EARLY_DATA_STATUS_CAN_WRITE);
} else {
@ -4089,7 +4089,7 @@ void tls13_cli_early_data_status(int scenario)
} while (client_ep.ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER);
#if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE)
TEST_EQUAL(client_ep.ssl.handshake->ccs_count, 1);
TEST_EQUAL(client_ep.ssl.handshake->ccs_sent, 1);
#endif
exit:
@ -4248,7 +4248,7 @@ void tls13_write_early_data(int scenario)
break;
case TEST_EARLY_DATA_HRR:
if (client_ep.ssl.handshake->hello_retry_request_count == 0) {
if (!client_ep.ssl.handshake->hello_retry_request_flag) {
TEST_EQUAL(write_early_data_ret, early_data_len);
TEST_EQUAL(client_ep.ssl.state, MBEDTLS_SSL_SERVER_HELLO);
} else {
@ -4270,7 +4270,7 @@ void tls13_write_early_data(int scenario)
break;
case TEST_EARLY_DATA_HRR:
if (client_ep.ssl.handshake->hello_retry_request_count == 0) {
if (!client_ep.ssl.handshake->hello_retry_request_flag) {
TEST_EQUAL(write_early_data_ret, early_data_len);
TEST_EQUAL(client_ep.ssl.state, MBEDTLS_SSL_SERVER_HELLO);
} else {