Add a test for running the config twice

Make sure there are no leaks from running the config file twice.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/16425)

test/build.info

@@ -57,7 +57,7 @@ IF[{- !$disabled{tests} -}]
           context_internal_test aesgcmtest params_test evp_pkey_dparams_test \
           keymgmt_internal_test hexstr_test provider_status_test defltfips_test \
           bio_readbuffer_test user_property_test pkcs7_test upcallstest \
-          provfetchtest
+          provfetchtest prov_config_test
 
   IF[{- !$disabled{'deprecated-3.0'} -}]
     PROGRAMS{noinst}=enginetest
@@ -176,6 +176,10 @@ IF[{- !$disabled{tests} -}]
   INCLUDE[provfetchtest]=../include ../apps/include
   DEPEND[provfetchtest]=../libcrypto.a libtestutil.a
 
+  SOURCE[prov_config_test]=prov_config_test.c
+  INCLUDE[prov_config_test]=../include ../apps/include
+  DEPEND[prov_config_test]=../libcrypto.a libtestutil.a
+
   SOURCE[evp_pkey_provided_test]=evp_pkey_provided_test.c
   INCLUDE[evp_pkey_provided_test]=../include ../apps/include
   DEPEND[evp_pkey_provided_test]=../libcrypto.a libtestutil.a

test/prov_config_test.c

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <openssl/evp.h>
+#include "testutil.h"
+
+static char *configfile = NULL;
+
+/*
+ * Test to make sure there are no leaks or failures from loading the config
+ * file twice.
+ */
+static int test_double_config(void)
+{
+    OSSL_LIB_CTX *ctx = OSSL_LIB_CTX_new();
+    int testresult = 0;
+    EVP_MD *sha256 = NULL;
+
+    if (!TEST_ptr(configfile))
+        return 0;
+    if (!TEST_ptr(ctx))
+        return 0;
+
+    if (!TEST_true(OSSL_LIB_CTX_load_config(ctx, configfile)))
+        return 0;
+    if (!TEST_true(OSSL_LIB_CTX_load_config(ctx, configfile)))
+        return 0;
+
+    /* Check we can actually fetch something */
+    sha256 = EVP_MD_fetch(ctx, "SHA2-256", NULL);
+    if (!TEST_ptr(sha256))
+        goto err;
+
+    testresult = 1;
+ err:
+    EVP_MD_free(sha256);
+    OSSL_LIB_CTX_free(ctx);
+    return testresult;
+}
+
+OPT_TEST_DECLARE_USAGE("configfile\n")
+
+int setup_tests(void)
+{
+    if (!test_skip_common_options()) {
+        TEST_error("Error parsing test options\n");
+        return 0;
+    }
+
+    if (!TEST_ptr(configfile = test_get_argument(0)))
+        return 0;
+
+    ADD_TEST(test_double_config);
+    return 1;
+}

test/recipes/30-test_prov_config.t

@@ -0,0 +1,32 @@
+#! /usr/bin/env perl
+# Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the Apache License 2.0 (the "License").  You may not use
+# this file except in compliance with the License.  You can obtain a copy
+# in the file LICENSE in the source distribution or at
+# https://www.openssl.org/source/license.html
+
+
+use OpenSSL::Test::Simple;
+use OpenSSL::Test qw/:DEFAULT srctop_file srctop_dir bldtop_dir/;
+use OpenSSL::Test::Utils;
+
+BEGIN {
+setup("test_prov_config");
+}
+
+use lib srctop_dir('Configurations');
+use lib bldtop_dir('.');
+
+my $no_fips = disabled('fips') || ($ENV{NO_FIPS} // 0);
+
+plan tests => 2;
+
+ok(run(test(["prov_config_test", srctop_file("test", "default.cnf")])),
+    "running prov_config_test default.cnf");
+SKIP: {
+    skip "Skipping FIPS test in this build", 1 if $no_fips;
+
+    ok(run(test(["prov_config_test", srctop_file("test", "fips.cnf")])),
+       "running prov_config_test fips.cnf");
+}