Unwind the fallback admin policy knobs.

components/ssl_config/ssl_config_service_manager_pref.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 #include "components/ssl_config/ssl_config_service_manager.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <string>
 #include <vector>
@@ skipping 149 matching lines @@
   // cached list of parsed SSL/TLS cipher suites that are disabled.
   void OnDisabledCipherSuitesChange(PrefService* local_state);
 
   PrefChangeRegistrar local_state_change_registrar_;
 
   // The local_state prefs (should only be accessed from UI thread)
   BooleanPrefMember rev_checking_enabled_;
   BooleanPrefMember rev_checking_required_local_anchors_;
   StringPrefMember ssl_version_min_;
   StringPrefMember ssl_version_max_;
-  StringPrefMember ssl_version_fallback_min_;
 
   // The cached list of disabled SSL cipher suites.
   std::vector<uint16_t> disabled_cipher_suites_;
 
   scoped_refptr<SSLConfigServicePref> ssl_config_service_;
 
   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(SSLConfigServiceManagerPref);
 };
@@ skipping 11 matching lines @@
 
   rev_checking_enabled_.Init(ssl_config::prefs::kCertRevocationCheckingEnabled,
                              local_state, local_state_callback);
   rev_checking_required_local_anchors_.Init(
       ssl_config::prefs::kCertRevocationCheckingRequiredLocalAnchors,
       local_state, local_state_callback);
   ssl_version_min_.Init(ssl_config::prefs::kSSLVersionMin, local_state,
                         local_state_callback);
   ssl_version_max_.Init(ssl_config::prefs::kSSLVersionMax, local_state,
                         local_state_callback);
-  ssl_version_fallback_min_.Init(ssl_config::prefs::kSSLVersionFallbackMin,
-                                 local_state, local_state_callback);
 
   local_state_change_registrar_.Init(local_state);
   local_state_change_registrar_.Add(ssl_config::prefs::kCipherSuiteBlacklist,
                                     local_state_callback);
 
   OnDisabledCipherSuitesChange(local_state);
 
   // Initialize from UI thread.  This is okay as there shouldn't be anything on
   // the IO thread trying to access it yet.
   GetSSLConfigFromPrefs(&ssl_config_service_->cached_config_);
 }
 
 // static
 void SSLConfigServiceManagerPref::RegisterPrefs(PrefRegistrySimple* registry) {
   net::SSLConfig default_config;
   registry->RegisterBooleanPref(
       ssl_config::prefs::kCertRevocationCheckingEnabled,
       default_config.rev_checking_enabled);
   registry->RegisterBooleanPref(
       ssl_config::prefs::kCertRevocationCheckingRequiredLocalAnchors,
       default_config.rev_checking_required_local_anchors);
   registry->RegisterStringPref(ssl_config::prefs::kSSLVersionMin,
                                std::string());
   registry->RegisterStringPref(ssl_config::prefs::kSSLVersionMax,
                                std::string());
-  registry->RegisterStringPref(ssl_config::prefs::kSSLVersionFallbackMin,
-                               std::string());
   registry->RegisterListPref(ssl_config::prefs::kCipherSuiteBlacklist);
 }
 
 net::SSLConfigService* SSLConfigServiceManagerPref::Get() {
   return ssl_config_service_.get();
 }
 
 void SSLConfigServiceManagerPref::OnPreferenceChanged(
     PrefService* prefs,
     const std::string& pref_name_in) {
@@ skipping 16 matching lines @@
   // rev_checking_enabled was formerly a user-settable preference, but now
   // it is managed-only.
   if (rev_checking_enabled_.IsManaged())
     config->rev_checking_enabled = rev_checking_enabled_.GetValue();
   else
     config->rev_checking_enabled = false;
   config->rev_checking_required_local_anchors =
       rev_checking_required_local_anchors_.GetValue();
   std::string version_min_str = ssl_version_min_.GetValue();
   std::string version_max_str = ssl_version_max_.GetValue();
-  std::string version_fallback_min_str = ssl_version_fallback_min_.GetValue();
   config->version_min = net::kDefaultSSLVersionMin;
   config->version_max = net::kDefaultSSLVersionMax;
-  config->version_fallback_min = net::kDefaultSSLVersionFallbackMin;
   uint16_t version_min = SSLProtocolVersionFromString(version_min_str);
   uint16_t version_max = SSLProtocolVersionFromString(version_max_str);
-  uint16_t version_fallback_min =
-      SSLProtocolVersionFromString(version_fallback_min_str);
   if (version_min) {
     config->version_min = version_min;
   }
   if (version_max) {
     uint16_t supported_version_max = config->version_max;
     config->version_max = std::min(supported_version_max, version_max);
   }
-  // Values below TLS 1.1 are invalid.
-  if (version_fallback_min &&
-      version_fallback_min >= net::SSL_PROTOCOL_VERSION_TLS1_1) {
-    config->version_fallback_min = version_fallback_min;
-  }
   config->disabled_cipher_suites = disabled_cipher_suites_;
 }
 
 void SSLConfigServiceManagerPref::OnDisabledCipherSuitesChange(
     PrefService* local_state) {
   const base::ListValue* value =
       local_state->GetList(ssl_config::prefs::kCipherSuiteBlacklist);
   disabled_cipher_suites_ = ParseCipherSuites(ListValueToStringVector(value));
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 //  SSLConfigServiceManager
 
 namespace ssl_config {
 // static
 SSLConfigServiceManager* SSLConfigServiceManager::CreateDefaultManager(
     PrefService* local_state,
     const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner) {
   return new SSLConfigServiceManagerPref(local_state, io_task_runner);
 }
 
 // static
 void SSLConfigServiceManager::RegisterPrefs(PrefRegistrySimple* registry) {
   SSLConfigServiceManagerPref::RegisterPrefs(registry);
 }
 }  // namespace ssl_config