src,deps,build,test: add OpenSSL config appname

This commit adds the setting of an appname (configuration section
name), 'nodejs_conf', to be used when reading OpenSSL configuration
files.

The motivation for this is that currently the default OpenSSL
configuration, 'openssl_conf', element will be used which may be
undesirable as it might configure OpenSSL in unwanted ways. With this
commit it is still possible to use a default openssl.cnf file but the
only section that Node.js will read from is a section named
'nodejs_conf'.

PR-URL: #43124
Refs: #40366
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>

Backport-PR-URL: #43586

BUILDING.md

@@ -52,6 +52,7 @@ file a new issue.
   * [Build with a specific ICU](#build-with-a-specific-icu)
     * [Unix/macOS](#unixmacos-3)
     * [Windows](#windows-4)
+* [Configuring OpenSSL config appname](#configure-openssl-appname)
 * [Building Node.js with FIPS-compliant OpenSSL](#building-nodejs-with-fips-compliant-openssl)
 * [Building Node.js with external core modules](#building-nodejs-with-external-core-modules)
   * [Unix/macOS](#unixmacos-4)
@@ -766,6 +767,19 @@ as `deps/icu` (You'll have: `deps/icu/source/...`)
 > .\vcbuild full-icu
 ```
 
+### Configure OpenSSL appname
+
+Node.js can use an OpenSSL configuration file by specifying the environment
+variable `OPENSSL_CONF`, or using the command line option `--openssl-conf`, and
+if none of those are specified will default to reading the default OpenSSL
+configuration file `openssl.cnf`. Node.js will only read a section that is by
+default named `nodejs_conf`, but this name can be overridden using the following
+configure option:
+
+```console
+$ ./configure --openssl-conf-name=<some_conf_name>
+```
+
 ## Building Node.js with FIPS-compliant OpenSSL
 
 The current version of Node.js does not support FIPS.

configure.py

@@ -176,6 +176,12 @@
          "e.g. /root/x/y.js will be referenced via require('root/x/y'). "
          "Can be used multiple times")
 
+parser.add_option("--openssl-conf-name",
+    action="store",
+    dest="openssl_conf_name",
+    default='nodejs_conf',
+    help="The OpenSSL config appname (config section name) used by Node.js")
+
 parser.add_option('--openssl-default-cipher-list',
     action='store',
     dest='openssl_default_cipher_list',
@@ -1337,6 +1343,8 @@ def configure_openssl(o):
   if options.openssl_no_asm:
     variables['openssl_no_asm'] = 1
 
+  o['defines'] += ['NODE_OPENSSL_CONF_NAME=' + options.openssl_conf_name]
+
   if options.without_ssl:
     def without_ssl_error(option):
       error('--without-ssl is incompatible with %s' % option)

src/node.cc

@@ -44,6 +44,7 @@
 #if HAVE_OPENSSL
 #include "allocated_buffer-inl.h"  // Inlined functions needed by node_crypto.h
 #include "node_crypto.h"
+#include <openssl/conf.h>
 #endif
 
 #if defined(NODE_HAVE_I18N_SUPPORT)
@@ -154,6 +155,9 @@ uint64_t node_start_time;
 struct V8Platform v8_platform;
 }  // namespace per_process
 
+// The section in the OpenSSL configuration file to be loaded.
+const char* conf_section_name = STRINGIFY(NODE_OPENSSL_CONF_NAME);
+
 #ifdef __POSIX__
 void SignalExit(int signo, siginfo_t* info, void* ucontext) {
   ResetStdio();
@@ -975,6 +979,7 @@ void Init(int* argc,
     argv[i] = strdup(argv_[i].c_str());
 }
 
+
 InitializationResult InitializeOncePerProcess(int argc, char** argv) {
   // Initialized the enabled list for Debug() calls with system
   // environment variables.
@@ -1040,6 +1045,44 @@ InitializationResult InitializeOncePerProcess(int argc, char** argv) {
     if (credentials::SafeGetenv("NODE_EXTRA_CA_CERTS", &extra_ca_certs))
       crypto::UseExtraCaCerts(extra_ca_certs);
   }
+
+  // Passing NULL as the config file will allow the default openssl.cnf file
+  // to be loaded, but the default section in that file will not be used,
+  // instead only the section that matches the value of conf_section_name
+  // will be read from the default configuration file.
+  const char* conf_file = nullptr;
+  // Use OPENSSL_CONF environment variable is set.
+  std::string env_openssl_conf;
+  credentials::SafeGetenv("OPENSSL_CONF", &env_openssl_conf);
+  if (!env_openssl_conf.empty()) {
+    conf_file = env_openssl_conf.c_str();
+  }
+  // Use --openssl-conf command line option if specified.
+  if (!per_process::cli_options->openssl_config.empty()) {
+    conf_file = per_process::cli_options->openssl_config.c_str();
+  }
+
+  OPENSSL_INIT_SETTINGS* settings = OPENSSL_INIT_new();
+  OPENSSL_INIT_set_config_filename(settings, conf_file);
+  OPENSSL_INIT_set_config_appname(settings, conf_section_name);
+  OPENSSL_INIT_set_config_file_flags(settings,
+                                     CONF_MFLAGS_IGNORE_MISSING_FILE);
+
+  OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CONFIG, settings);
+  OPENSSL_INIT_free(settings);
+
+  if (ERR_peek_error() != 0) {
+    int ossl_error_code = ERR_GET_REASON(ERR_peek_error());
+    if (ossl_error_code != EVP_R_FIPS_MODE_NOT_SUPPORTED) {
+      result.exit_code = ossl_error_code;
+      result.early_return = true;
+      fprintf(stderr, "%s", "OpenSSL configuration error:\n");
+      ERR_print_errors_fp(stderr);
+      return result;
+    }
+  }
+
+
   // In the case of FIPS builds we should make sure
   // the random source is properly initialized first.
   if (FIPS_mode()) {

test/fixtures/openssl_fips_disabled.cnf

@@ -1,6 +1,6 @@
 # Skeleton openssl.cnf for testing with FIPS
 
-openssl_conf = openssl_conf_section
+nodejs_conf = openssl_conf_section
 authorityKeyIdentifier=keyid:always,issuer:always
 
 [openssl_conf_section]

test/fixtures/openssl_fips_enabled.cnf

@@ -1,6 +1,6 @@
 # Skeleton openssl.cnf for testing with FIPS
 
-openssl_conf = openssl_conf_section
+nodejs_conf = openssl_conf_section
 authorityKeyIdentifier=keyid:always,issuer:always
 
 [openssl_conf_section]

test/parallel/test-crypto-fips.js

@@ -64,7 +64,7 @@ testHelper(
   [],
   FIPS_DISABLED,
   'require("crypto").getFips()',
-  { ...process.env, 'OPENSSL_CONF': '' });
+  { ...process.env, 'OPENSSL_CONF': ' ' });
 
 // --enable-fips should turn FIPS mode on
 testHelper(