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tls13: Send dummy CCS only once

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Fix cases where the client was sending
two CCS, no harm but better to send only one.

Prevent to send even more CCS when early data
are involved without having to add conditional
state transitions.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron
2024-01-24 14:31:50 +01:00
parent bfcdc069ef
commit fe59ff794d
4 changed files with 35 additions and 15 deletions
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10
library/ssl_tls13_server.c
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@ -3482,10 +3482,14 @@ int mbedtls_ssl_tls13_handshake_server_step(mbedtls_ssl_context *ssl)
break;
case MBEDTLS_SSL_SERVER_CCS_AFTER_SERVER_HELLO:
ret = mbedtls_ssl_tls13_write_change_cipher_spec(ssl);
if (ret == 0) {
mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_ENCRYPTED_EXTENSIONS);
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 */