tls: add --tls-min-v1.2 CLI switch

For 11.x, the default minimum is TLSv1, so it needs a CLI switch to
change the default to the more secure minimum of TLSv1.2.

PR-URL: nodejs#26951
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>

doc/api/cli.md

@@ -475,6 +475,14 @@ added: REPLACEME
 Set default [`tls.DEFAULT_MIN_VERSION`][] to 'TLSv1.1'. Use for compatibility
 with old TLS clients or servers.
 
+### `--tls-min-v1.2`
+<!-- YAML
+added: REPLACEME
+-->
+
+Set default [`minVersion`][] to `'TLSv1.2'`. Use to disable support for TLSv1
+and TLSv1.1 in favour of TLSv1.2, which is more secure.
+
 ### `--tls-min-v1.3`
 <!-- YAML
 added: REPLACEME

doc/node.1

@@ -250,6 +250,10 @@ or servers.
 Set default minVersion to 'TLSv1.1'. Use for compatibility with old TLS clients
 or servers.
 .
+.It Fl -tls-min-v1.2
+Set default minVersion to 'TLSv1.2'. Use to disable support for TLSv1 and
+TLSv1.1 in favour of TLSv1.2, which is more secure.
+.
 .It Fl -tls-min-v1.3
 Set default minVersion to 'TLSv1.3'. Use to disable support for TLSv1.2 in
 favour of TLSv1.3, which is more secure.

lib/tls.js

@@ -58,6 +58,8 @@ if (getOptionValue('--tls-min-v1.0'))
   exports.DEFAULT_MIN_VERSION = 'TLSv1';
 else if (getOptionValue('--tls-min-v1.1'))
   exports.DEFAULT_MIN_VERSION = 'TLSv1.1';
+else if (getOptionValue('--tls-min-v1.2'))
+  exports.DEFAULT_MIN_VERSION = 'TLSv1.2';
 else if (getOptionValue('--tls-min-v1.3'))
   exports.DEFAULT_MIN_VERSION = 'TLSv1.3';
 else

src/node_options.cc

@@ -336,6 +336,10 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
             "set default TLS minimum to TLSv1.1 (default: TLSv1)",
             &EnvironmentOptions::tls_min_v1_1,
             kAllowedInEnvironment);
+  AddOption("--tls-min-v1.2",
+            "set default TLS minimum to TLSv1.2 (default: TLSv1)",
+            &EnvironmentOptions::tls_min_v1_2,
+            kAllowedInEnvironment);
   AddOption("--tls-min-v1.3",
             "set default TLS minimum to TLSv1.3 (default: TLSv1)",
             &EnvironmentOptions::tls_min_v1_3,

src/node_options.h

@@ -138,6 +138,7 @@ class EnvironmentOptions : public Options {
 
   bool tls_min_v1_0 = false;
   bool tls_min_v1_1 = false;
+  bool tls_min_v1_2 = false;
   bool tls_min_v1_3 = false;
   bool tls_max_v1_2 = false;
   bool tls_max_v1_3 = false;

test/parallel/test-tls-cli-min-version-1.2.js

@@ -0,0 +1,15 @@
+// Flags: --tls-min-v1.2
+'use strict';
+const common = require('../common');
+if (!common.hasCrypto) common.skip('missing crypto');
+
+// Check that node `--tls-min-v1.2` is supported.
+
+const assert = require('assert');
+const tls = require('tls');
+
+assert.strictEqual(tls.DEFAULT_MAX_VERSION, 'TLSv1.2');
+assert.strictEqual(tls.DEFAULT_MIN_VERSION, 'TLSv1.2');
+
+// Check the min-max version protocol versions against these CLI settings.
+require('./test-tls-min-max-version.js');