lavf/tls_mbedtls: add workaround for TLSv1.3 vs. verify=0

As of mbedTLS 3.6.0 TLSv1.3 is enabled by default and certificate verification is now mandatory. Our default configuration does not do verification, so downgrade to 1.2 in these situations to avoid breaking it. ref: Mbed-TLS/mbedtls#7075 Signed-off-by: Anton Khirnov <[email protected]>
xxpniu · Jun 18, 2024 · c28e5b5 · c28e5b5
1 parent ab8f703
commit c28e5b5
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/libavformat/tls_mbedtls.c b/libavformat/tls_mbedtls.c
@@ -269,6 +269,14 @@ static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **op
         goto fail;
     }
 
+#ifdef MBEDTLS_SSL_PROTO_TLS1_3
+    // mbedTLS does not allow disabling certificate verification with TLSv1.3 (yes, really).
+    if (!shr->verify) {
+        av_log(h, AV_LOG_INFO, "Forcing TLSv1.2 because certificate verification is disabled\n");
+        mbedtls_ssl_conf_max_tls_version(&tls_ctx->ssl_config, MBEDTLS_SSL_VERSION_TLS1_2);
+    }
+#endif
+
     // not VERIFY_REQUIRED because we manually check after handshake
     mbedtls_ssl_conf_authmode(&tls_ctx->ssl_config,
                               shr->verify ? MBEDTLS_SSL_VERIFY_OPTIONAL : MBEDTLS_SSL_VERIFY_NONE);