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Allow optional authentication of the server in 1.3

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This is for compatibility, for people transitioning from 1.2 to 1.3.
See https://github.com/Mbed-TLS/mbedtls/issues/9223 "Mandatory server
authentication" and reports linked from there.

In the future we're likely to make server authentication mandatory in
both 1.2 and 1.3. See https://github.com/Mbed-TLS/mbedtls/issues/7080

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard
2024-08-14 09:47:38 +02:00
parent 4d4c0c72da
commit e1cc926717
3 changed files with 35 additions and 37 deletions
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19
library/ssl_tls13_generic.c
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@@ -629,22 +629,17 @@ MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_tls13_validate_certificate(mbedtls_ssl_context *ssl)
{
int ret = 0;
int authmode = MBEDTLS_SSL_VERIFY_REQUIRED;
mbedtls_x509_crt *ca_chain;
mbedtls_x509_crl *ca_crl;
uint32_t verify_result = 0;
/* If SNI was used, overwrite authentication mode
* from the configuration. */
#if defined(MBEDTLS_SSL_SRV_C)
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) {
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
if (ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET) {
authmode = ssl->handshake->sni_authmode;
} else
#endif
authmode = ssl->conf->authmode;
}
/* Authmode: precedence order is SNI if used else configuration */
#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
const int authmode = ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET
? ssl->handshake->sni_authmode
: ssl->conf->authmode;
#else
const int authmode = ssl->conf->authmode;
#endif
/*