Add support for OpenSSL security level

NEWS

@@ -59,6 +59,8 @@ PHP                                                                        NEWS
     (Nikita, Dmitry)
 
 - OpenSSL:
+  . Add ssl security_level stream option to support OpenSSL security levels.
+    (Jakub Zelenka).
   . Allow setting SNI cert and private key in separate files. (Jakub Zelenka)
   . Fixed bug #74651 (negative-size-param (-1) in memcpy in zif_openssl_seal()).
     (Stas)

ext/openssl/tests/stream_security_level.phpt

@@ -0,0 +1,48 @@
+--TEST--
+security_level setting to prohibit cert
+--SKIPIF--
+<?php
+if (!extension_loaded("openssl")) die("skip openssl not loaded");
+if (OPENSSL_VERSION_NUMBER < 0x10100000) die("skip OpenSSL >= v1.1.0 required");
+if (!function_exists("proc_open")) die("skip no proc_open");
+--FILE--
+<?php
+$serverCode = <<<'CODE'
+	$serverUri = "ssl://127.0.0.1:64322";
+	$serverFlags = STREAM_SERVER_BIND | STREAM_SERVER_LISTEN;
+	$serverCtx = stream_context_create(['ssl' => [
+		'local_cert' => __DIR__ . '/bug54992.pem'
+	]]);
+
+	$server = stream_socket_server($serverUri, $errno, $errstr, $serverFlags, $serverCtx);
+	phpt_notify();
+
+	@stream_socket_accept($server, 1);
+CODE;
+
+$clientCode = <<<'CODE'
+	$serverUri = "ssl://127.0.0.1:64322";
+	$clientFlags = STREAM_CLIENT_CONNECT;
+	$clientCtx = stream_context_create(['ssl' => [
+		'security_level' => 3,
+		'verify_peer' => true,
+		'cafile' => __DIR__ . '/bug54992-ca.pem',
+		'verify_peer_name' => false
+	]]);
+
+	phpt_wait();
+	$client = stream_socket_client($serverUri, $errno, $errstr, 1, $clientFlags, $clientCtx);
+
+	var_dump($client);
+CODE;
+
+include 'ServerClientTestCase.inc';
+ServerClientTestCase::getInstance()->run($clientCode, $serverCode);
+--EXPECTF--
+Warning: stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages:
+error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed in %s : eval()'d code on line %d
+
+Warning: stream_socket_client(): Failed to enable crypto in %s : eval()'d code on line %d
+
+Warning: stream_socket_client(): unable to connect to ssl://127.0.0.1:64322 (Unknown error) in %s : eval()'d code on line %d
+bool(false)

ext/openssl/xp_ssl.c

@@ -70,6 +70,9 @@
 #endif
 #endif
 
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
+#define HAVE_SEC_LEVEL 1
+#endif
 
 /* Flags for determining allowed stream crypto methods */
 #define STREAM_CRYPTO_IS_CLIENT            (1<<0)
@@ -1613,6 +1616,20 @@ int php_openssl_setup_crypto(php_stream *stream,
 		}
 	}
 
+	if (GET_VER_OPT("security_level")) {
+#ifdef HAVE_SEC_LEVEL
+		convert_to_long(val);
+		if (Z_LVAL_P(val) < 0 || Z_LVAL_P(val) > 5) {
+			php_error_docref(NULL, E_WARNING, "Security level must be between 0 and 5");
+		}
+		SSL_CTX_set_security_level(sslsock->ctx, Z_LVAL_P(val));
+#else
+		php_error_docref(NULL, E_WARNING,
+				"security_level is not supported by the linked OpenSSL library "
+				"- it is supported from version 1.1.0");
+#endif
+	}
+
 	GET_VER_OPT_STRING("alpn_protocols", alpn_protocols);
 	if (alpn_protocols) {
 #ifdef HAVE_TLS_ALPN