src: add --use-bundled-ca --use-openssl-ca check

The --use-bundled-ca and --use-openssl-ca command line arguments are
mutually exclusive but can both be used on the same command line.

This commit adds a check if both options are used.

Fixes: nodejs#12083
PR-URL: nodejs#12087
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>

src/node.cc

@@ -3637,6 +3637,8 @@ static void ParseArgs(int* argc,
   const char** new_v8_argv = new const char*[nargs];
   const char** new_argv = new const char*[nargs];
   const char** local_preload_modules = new const char*[nargs];
+  bool use_bundled_ca = false;
+  bool use_openssl_ca = false;
 
   for (unsigned int i = 0; i < nargs; ++i) {
     new_exec_argv[i] = nullptr;
@@ -3751,7 +3753,9 @@ static void ParseArgs(int* argc,
       default_cipher_list = arg + 18;
     } else if (strncmp(arg, "--use-openssl-ca", 16) == 0) {
       ssl_openssl_cert_store = true;
+      use_openssl_ca = true;
     } else if (strncmp(arg, "--use-bundled-ca", 16) == 0) {
+      use_bundled_ca = true;
       ssl_openssl_cert_store = false;
 #if NODE_FIPS_MODE
     } else if (strcmp(arg, "--enable-fips") == 0) {
@@ -3786,6 +3790,16 @@ static void ParseArgs(int* argc,
     index += args_consumed;
   }
 
+#if HAVE_OPENSSL
+  if (use_openssl_ca && use_bundled_ca) {
+    fprintf(stderr,
+            "%s: either --use-openssl-ca or --use-bundled-ca can be used, "
+            "not both\n",
+            argv[0]);
+    exit(9);
+  }
+#endif
+
   // Copy remaining arguments.
   const unsigned int args_left = nargs - index;
   memcpy(new_argv + new_argc, argv + index, args_left * sizeof(*argv));

test/parallel/test-openssl-ca-options.js

@@ -0,0 +1,31 @@
+'use strict';
+// This test checks the usage of --use-bundled-ca and --use-openssl-ca arguments
+// to verify that both are not used at the same time.
+const common = require('../common');
+if (!common.hasCrypto) {
+  common.skip('missing crypto');
+  return;
+}
+const assert = require('assert');
+const os = require('os');
+const childProcess = require('child_process');
+const result = childProcess.spawnSync(process.execPath, [
+                                      '--use-bundled-ca',
+                                      '--use-openssl-ca',
+                                      '-p', 'process.version'],
+                                      {encoding: 'utf8'});
+
+assert.strictEqual(result.stderr,
+                   process.execPath + ': either --use-openssl-ca or ' +
+                   '--use-bundled-ca can be used, not both' + os.EOL);
+assert.strictEqual(result.status, 9);
+
+const useBundledCA = childProcess.spawnSync(process.execPath, [
+                                            '--use-bundled-ca',
+                                            '-p', 'process.version']);
+assert.strictEqual(useBundledCA.status, 0);
+
+const useOpenSSLCA = childProcess.spawnSync(process.execPath, [
+                                            '--use-openssl-ca',
+                                            '-p', 'process.version']);
+assert.strictEqual(useOpenSSLCA.status, 0);