Integrate OpenSSL libctx to pwhash (#19236)

This allows using OpenSSL Argon2 password hashing on ZTS.

Closes GH-19236

ext/openssl/config0.m4

@@ -49,9 +49,6 @@ if test "$PHP_OPENSSL" != "no"; then
       the default provider.])])
 
   AS_VAR_IF([PHP_OPENSSL_ARGON2], [no],, [
-    AS_VAR_IF([PHP_THREAD_SAFETY], [yes],
-      [AC_MSG_ERROR([Not supported in ZTS mode for now])])
-
     PHP_CHECK_LIBRARY([crypto], [OSSL_set_max_threads],
       [AC_DEFINE([HAVE_OPENSSL_ARGON2], [1],
         [Define to 1 to enable OpenSSL argon2 password hashing.])],

ext/openssl/openssl.c

@@ -355,7 +355,15 @@ static PHP_INI_MH(OnUpdateLibCtx)
 {
 #if PHP_OPENSSL_API_VERSION >= 0x30000
 	if (zend_string_equals_literal(new_value, "default")) {
+#if defined(ZTS) && defined(HAVE_OPENSSL_ARGON2)
+		if (stage != ZEND_INI_STAGE_DEACTIVATE) {
+			int err_type = stage == ZEND_INI_STAGE_RUNTIME ? E_WARNING : E_ERROR;
+			php_error_docref(NULL, err_type, "OpenSSL libctx \"default\" cannot be used in this configuration");
+		}
+		return FAILURE;
+#else
 		OPENSSL_G(ctx).libctx = OPENSSL_G(ctx).default_libctx;
+#endif
 	} else if (zend_string_equals_literal(new_value, "custom")) {
 		OPENSSL_G(ctx).libctx = OPENSSL_G(ctx).custom_libctx;
 	} else {

ext/openssl/openssl_pwhash.c

@@ -22,7 +22,7 @@
 #include "ext/standard/php_password.h"
 #include "php_openssl.h"
 
-#if defined(HAVE_OPENSSL_ARGON2)
+#ifdef HAVE_OPENSSL_ARGON2
 #include "Zend/zend_attributes.h"
 #include "openssl_pwhash_arginfo.h"
 #include <ext/standard/base64.h>
@@ -46,6 +46,8 @@
 #define PHP_OPENSSL_HASH_SIZE     32
 #define PHP_OPENSSL_DIGEST_SIZE  128
 
+ZEND_EXTERN_MODULE_GLOBALS(openssl)
+
 static inline zend_result get_options(zend_array *options, uint32_t *memlimit, uint32_t *iterlimit, uint32_t *threads)
 {
 	zval *opt;
@@ -98,8 +100,8 @@ static bool php_openssl_argon2_compute_hash(
 	uint32_t oldthreads;
 	bool ret = false;
 
-	oldthreads = OSSL_get_max_threads(NULL);
-	if (OSSL_set_max_threads(NULL, threads) != 1) {
+	oldthreads = OSSL_get_max_threads(PHP_OPENSSL_LIBCTX);
+	if (OSSL_set_max_threads(PHP_OPENSSL_LIBCTX, threads) != 1) {
 		goto fail;
 	}
 	p = params;
@@ -111,7 +113,7 @@ static bool php_openssl_argon2_compute_hash(
 	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD, (void *)pass, pass_len);
 	*p++ = OSSL_PARAM_construct_end();
 
-	if ((kdf = EVP_KDF_fetch(NULL, algo, NULL)) == NULL) {
+	if ((kdf = EVP_KDF_fetch(PHP_OPENSSL_LIBCTX, algo, PHP_OPENSSL_PROPQ)) == NULL) {
 		goto fail;
 	}
 	if ((kctx = EVP_KDF_CTX_new(kdf)) == NULL) {
@@ -127,7 +129,7 @@ static bool php_openssl_argon2_compute_hash(
 fail:
 	EVP_KDF_free(kdf);
 	EVP_KDF_CTX_free(kctx);
-	OSSL_set_max_threads(NULL, oldthreads);
+	OSSL_set_max_threads(PHP_OPENSSL_LIBCTX, oldthreads);
 
 	return ret;
 }
@@ -385,4 +387,5 @@ PHP_MINIT_FUNCTION(openssl_pwhash)
 
 	return SUCCESS;
 }
+
 #endif /* HAVE_OPENSSL_ARGON2 */

ext/openssl/tests/openssl_libctx_with_zts_argon.phpt

@@ -0,0 +1,22 @@
+--TEST--
+openssl.libctx INI setting when Argon2 enabled and ZTS used
+--EXTENSIONS--
+openssl
+--INI--
+openssl.libctx = default
+--SKIPIF--
+<?php
+if (!ZEND_THREAD_SAFE) {
+    die("skip - Non ZTS test");
+}
+if (!function_exists('openssl_password_hash')) {
+    die("skip - OpenSSL Argon2 not enabled");
+}
+?>
+--FILE--
+<?php
+var_dump(ini_get('openssl.libctx'));
+?>
+--EXPECT--
+Fatal error: PHP Startup: OpenSSL libctx "default" cannot be used in this configuration in Unknown on line 0
+string(6) "custom"

ext/openssl/tests/openssl_libctx_without_zts_argon.phpt

@@ -0,0 +1,18 @@
+--TEST--
+openssl.libctx INI setting when Argon2 disable or ZTS not used
+--EXTENSIONS--
+openssl
+--INI--
+openssl.libctx = default
+--SKIPIF--
+<?php
+if (ZEND_THREAD_SAFE && function_exists('openssl_password_hash')) {
+    die("skip - ZTS test with Argon2 enabled");
+}
+?>
+--FILE--
+<?php
+var_dump(ini_get('openssl.libctx'));
+?>
+--EXPECT--
+string(7) "default"