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tls13: client: Improve CCS handling

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Call unconditionally the CCS writing function
when sending a CCS may be necessary in the
course of an handshake. Enforce in the writing
function and only in the writing function that
only one CCS is sent.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron
2024-02-13 18:22:26 +01:00
parent b3d42fddae
commit e273f7203d
3 changed files with 15 additions and 18 deletions
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6
library/ssl_tls13_client.c
View File

@ -3063,24 +3063,18 @@ int mbedtls_ssl_tls13_handshake_client_step(mbedtls_ssl_context *ssl)
*/
#if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE)
case MBEDTLS_SSL_CLIENT_CCS_BEFORE_2ND_CLIENT_HELLO:
ret = 0;
if (ssl->handshake->ccs_count == 0) {
ret = mbedtls_ssl_tls13_write_change_cipher_spec(ssl);
if (ret != 0) {
break;
}
}
mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_CLIENT_HELLO);
break;
case MBEDTLS_SSL_CLIENT_CCS_AFTER_SERVER_FINISHED:
ret = 0;
if (ssl->handshake->ccs_count == 0) {
ret = mbedtls_ssl_tls13_write_change_cipher_spec(ssl);
if (ret != 0) {
break;
}
}
mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_CLIENT_CERTIFICATE);
break;

6
library/ssl_tls13_generic.c
View File

@ -1379,6 +1379,12 @@ 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) {
ret = 0;
goto cleanup;
}
/* Write CCS message */
MBEDTLS_SSL_PROC_CHK(ssl_tls13_write_change_cipher_spec_body(
ssl, ssl->out_msg,

3
library/ssl_tls13_server.c
View File

@ -3482,13 +3482,10 @@ int mbedtls_ssl_tls13_handshake_server_step(mbedtls_ssl_context *ssl)
break;
case MBEDTLS_SSL_SERVER_CCS_AFTER_SERVER_HELLO:
ret = 0;
if (ssl->handshake->ccs_count == 0) {
ret = mbedtls_ssl_tls13_write_change_cipher_spec(ssl);
if (ret != 0) {
break;
}
}
mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_ENCRYPTED_EXTENSIONS);
break;
#endif /* MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE */