1// Copyright (c) 2012 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4#include "chrome/browser/net/ssl_config_service_manager.h" 5 6#include <algorithm> 7#include <string> 8#include <vector> 9 10#include "base/basictypes.h" 11#include "base/bind.h" 12#include "base/prefs/pref_change_registrar.h" 13#include "base/prefs/pref_member.h" 14#include "base/prefs/pref_registry_simple.h" 15#include "base/prefs/pref_service.h" 16#include "chrome/browser/chrome_notification_types.h" 17#include "chrome/browser/content_settings/content_settings_utils.h" 18#include "chrome/common/pref_names.h" 19#include "components/content_settings/core/common/content_settings.h" 20#include "content/public/browser/browser_thread.h" 21#include "net/ssl/ssl_cipher_suite_names.h" 22#include "net/ssl/ssl_config_service.h" 23 24using content::BrowserThread; 25 26namespace { 27 28// Converts a ListValue of StringValues into a vector of strings. Any Values 29// which cannot be converted will be skipped. 30std::vector<std::string> ListValueToStringVector(const base::ListValue* value) { 31 std::vector<std::string> results; 32 results.reserve(value->GetSize()); 33 std::string s; 34 for (base::ListValue::const_iterator it = value->begin(); it != value->end(); 35 ++it) { 36 if (!(*it)->GetAsString(&s)) 37 continue; 38 results.push_back(s); 39 } 40 return results; 41} 42 43// Parses a vector of cipher suite strings, returning a sorted vector 44// containing the underlying SSL/TLS cipher suites. Unrecognized/invalid 45// cipher suites will be ignored. 46std::vector<uint16> ParseCipherSuites( 47 const std::vector<std::string>& cipher_strings) { 48 std::vector<uint16> cipher_suites; 49 cipher_suites.reserve(cipher_strings.size()); 50 51 for (std::vector<std::string>::const_iterator it = cipher_strings.begin(); 52 it != cipher_strings.end(); ++it) { 53 uint16 cipher_suite = 0; 54 if (!net::ParseSSLCipherString(*it, &cipher_suite)) { 55 LOG(ERROR) << "Ignoring unrecognized or unparsable cipher suite: " 56 << *it; 57 continue; 58 } 59 cipher_suites.push_back(cipher_suite); 60 } 61 std::sort(cipher_suites.begin(), cipher_suites.end()); 62 return cipher_suites; 63} 64 65// Returns the string representation of an SSL protocol version. Returns an 66// empty string on error. 67std::string SSLProtocolVersionToString(uint16 version) { 68 switch (version) { 69 case net::SSL_PROTOCOL_VERSION_SSL3: 70 return "ssl3"; 71 case net::SSL_PROTOCOL_VERSION_TLS1: 72 return "tls1"; 73 case net::SSL_PROTOCOL_VERSION_TLS1_1: 74 return "tls1.1"; 75 case net::SSL_PROTOCOL_VERSION_TLS1_2: 76 return "tls1.2"; 77 default: 78 NOTREACHED(); 79 return std::string(); 80 } 81} 82 83// Returns the SSL protocol version (as a uint16) represented by a string. 84// Returns 0 if the string is invalid. 85uint16 SSLProtocolVersionFromString(const std::string& version_str) { 86 uint16 version = 0; // Invalid. 87 if (version_str == "ssl3") { 88 version = net::SSL_PROTOCOL_VERSION_SSL3; 89 } else if (version_str == "tls1") { 90 version = net::SSL_PROTOCOL_VERSION_TLS1; 91 } else if (version_str == "tls1.1") { 92 version = net::SSL_PROTOCOL_VERSION_TLS1_1; 93 } else if (version_str == "tls1.2") { 94 version = net::SSL_PROTOCOL_VERSION_TLS1_2; 95 } 96 return version; 97} 98 99} // namespace 100 101//////////////////////////////////////////////////////////////////////////////// 102// SSLConfigServicePref 103 104// An SSLConfigService which stores a cached version of the current SSLConfig 105// prefs, which are updated by SSLConfigServiceManagerPref when the prefs 106// change. 107class SSLConfigServicePref : public net::SSLConfigService { 108 public: 109 SSLConfigServicePref() {} 110 111 // Store SSL config settings in |config|. Must only be called from IO thread. 112 virtual void GetSSLConfig(net::SSLConfig* config) OVERRIDE; 113 114 private: 115 // Allow the pref watcher to update our internal state. 116 friend class SSLConfigServiceManagerPref; 117 118 virtual ~SSLConfigServicePref() {} 119 120 // This method is posted to the IO thread from the browser thread to carry the 121 // new config information. 122 void SetNewSSLConfig(const net::SSLConfig& new_config); 123 124 // Cached value of prefs, should only be accessed from IO thread. 125 net::SSLConfig cached_config_; 126 127 DISALLOW_COPY_AND_ASSIGN(SSLConfigServicePref); 128}; 129 130void SSLConfigServicePref::GetSSLConfig(net::SSLConfig* config) { 131 *config = cached_config_; 132} 133 134void SSLConfigServicePref::SetNewSSLConfig( 135 const net::SSLConfig& new_config) { 136 net::SSLConfig orig_config = cached_config_; 137 cached_config_ = new_config; 138 ProcessConfigUpdate(orig_config, new_config); 139} 140 141//////////////////////////////////////////////////////////////////////////////// 142// SSLConfigServiceManagerPref 143 144// The manager for holding and updating an SSLConfigServicePref instance. 145class SSLConfigServiceManagerPref 146 : public SSLConfigServiceManager { 147 public: 148 explicit SSLConfigServiceManagerPref(PrefService* local_state); 149 virtual ~SSLConfigServiceManagerPref() {} 150 151 // Register local_state SSL preferences. 152 static void RegisterPrefs(PrefRegistrySimple* registry); 153 154 virtual net::SSLConfigService* Get() OVERRIDE; 155 156 private: 157 // Callback for preference changes. This will post the changes to the IO 158 // thread with SetNewSSLConfig. 159 void OnPreferenceChanged(PrefService* prefs, 160 const std::string& pref_name); 161 162 // Store SSL config settings in |config|, directly from the preferences. Must 163 // only be called from UI thread. 164 void GetSSLConfigFromPrefs(net::SSLConfig* config); 165 166 // Processes changes to the disabled cipher suites preference, updating the 167 // cached list of parsed SSL/TLS cipher suites that are disabled. 168 void OnDisabledCipherSuitesChange(PrefService* local_state); 169 170 PrefChangeRegistrar local_state_change_registrar_; 171 172 // The local_state prefs (should only be accessed from UI thread) 173 BooleanPrefMember rev_checking_enabled_; 174 BooleanPrefMember rev_checking_required_local_anchors_; 175 StringPrefMember ssl_version_min_; 176 StringPrefMember ssl_version_max_; 177 StringPrefMember ssl_version_fallback_min_; 178 BooleanPrefMember ssl_record_splitting_disabled_; 179 180 // The cached list of disabled SSL cipher suites. 181 std::vector<uint16> disabled_cipher_suites_; 182 183 scoped_refptr<SSLConfigServicePref> ssl_config_service_; 184 185 DISALLOW_COPY_AND_ASSIGN(SSLConfigServiceManagerPref); 186}; 187 188SSLConfigServiceManagerPref::SSLConfigServiceManagerPref( 189 PrefService* local_state) 190 : ssl_config_service_(new SSLConfigServicePref()) { 191 DCHECK(local_state); 192 193 PrefChangeRegistrar::NamedChangeCallback local_state_callback = base::Bind( 194 &SSLConfigServiceManagerPref::OnPreferenceChanged, 195 base::Unretained(this), 196 local_state); 197 198 rev_checking_enabled_.Init( 199 prefs::kCertRevocationCheckingEnabled, local_state, local_state_callback); 200 rev_checking_required_local_anchors_.Init( 201 prefs::kCertRevocationCheckingRequiredLocalAnchors, 202 local_state, 203 local_state_callback); 204 ssl_version_min_.Init( 205 prefs::kSSLVersionMin, local_state, local_state_callback); 206 ssl_version_max_.Init( 207 prefs::kSSLVersionMax, local_state, local_state_callback); 208 ssl_version_fallback_min_.Init( 209 prefs::kSSLVersionFallbackMin, local_state, local_state_callback); 210 ssl_record_splitting_disabled_.Init( 211 prefs::kDisableSSLRecordSplitting, local_state, local_state_callback); 212 213 local_state_change_registrar_.Init(local_state); 214 local_state_change_registrar_.Add( 215 prefs::kCipherSuiteBlacklist, local_state_callback); 216 217 OnDisabledCipherSuitesChange(local_state); 218 219 // Initialize from UI thread. This is okay as there shouldn't be anything on 220 // the IO thread trying to access it yet. 221 GetSSLConfigFromPrefs(&ssl_config_service_->cached_config_); 222} 223 224// static 225void SSLConfigServiceManagerPref::RegisterPrefs(PrefRegistrySimple* registry) { 226 net::SSLConfig default_config; 227 registry->RegisterBooleanPref(prefs::kCertRevocationCheckingEnabled, 228 default_config.rev_checking_enabled); 229 registry->RegisterBooleanPref( 230 prefs::kCertRevocationCheckingRequiredLocalAnchors, 231 default_config.rev_checking_required_local_anchors); 232 std::string version_min_str = 233 SSLProtocolVersionToString(default_config.version_min); 234 std::string version_max_str = 235 SSLProtocolVersionToString(default_config.version_max); 236 std::string version_fallback_min_str = 237 SSLProtocolVersionToString(default_config.version_fallback_min); 238 registry->RegisterStringPref(prefs::kSSLVersionMin, version_min_str); 239 registry->RegisterStringPref(prefs::kSSLVersionMax, version_max_str); 240 registry->RegisterStringPref(prefs::kSSLVersionFallbackMin, 241 version_fallback_min_str); 242 registry->RegisterBooleanPref(prefs::kDisableSSLRecordSplitting, 243 !default_config.false_start_enabled); 244 registry->RegisterListPref(prefs::kCipherSuiteBlacklist); 245} 246 247net::SSLConfigService* SSLConfigServiceManagerPref::Get() { 248 return ssl_config_service_.get(); 249} 250 251void SSLConfigServiceManagerPref::OnPreferenceChanged( 252 PrefService* prefs, 253 const std::string& pref_name_in) { 254 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); 255 DCHECK(prefs); 256 if (pref_name_in == prefs::kCipherSuiteBlacklist) 257 OnDisabledCipherSuitesChange(prefs); 258 259 net::SSLConfig new_config; 260 GetSSLConfigFromPrefs(&new_config); 261 262 // Post a task to |io_loop| with the new configuration, so it can 263 // update |cached_config_|. 264 BrowserThread::PostTask( 265 BrowserThread::IO, 266 FROM_HERE, 267 base::Bind( 268 &SSLConfigServicePref::SetNewSSLConfig, 269 ssl_config_service_.get(), 270 new_config)); 271} 272 273void SSLConfigServiceManagerPref::GetSSLConfigFromPrefs( 274 net::SSLConfig* config) { 275 // rev_checking_enabled was formerly a user-settable preference, but now 276 // it is managed-only. 277 if (rev_checking_enabled_.IsManaged()) 278 config->rev_checking_enabled = rev_checking_enabled_.GetValue(); 279 else 280 config->rev_checking_enabled = false; 281 config->rev_checking_required_local_anchors = 282 rev_checking_required_local_anchors_.GetValue(); 283 std::string version_min_str = ssl_version_min_.GetValue(); 284 std::string version_max_str = ssl_version_max_.GetValue(); 285 std::string version_fallback_min_str = ssl_version_fallback_min_.GetValue(); 286 config->version_min = net::kDefaultSSLVersionMin; 287 config->version_max = net::kDefaultSSLVersionMax; 288 config->version_fallback_min = net::kDefaultSSLVersionFallbackMin; 289 uint16 version_min = SSLProtocolVersionFromString(version_min_str); 290 uint16 version_max = SSLProtocolVersionFromString(version_max_str); 291 uint16 version_fallback_min = 292 SSLProtocolVersionFromString(version_fallback_min_str); 293 if (version_min) { 294 // TODO(wtc): get the minimum SSL protocol version supported by the 295 // SSLClientSocket class. Right now it happens to be the same as the 296 // default minimum SSL protocol version because we enable all supported 297 // versions by default. 298 uint16 supported_version_min = config->version_min; 299 config->version_min = std::max(supported_version_min, version_min); 300 } 301 if (version_max) { 302 // TODO(wtc): get the maximum SSL protocol version supported by the 303 // SSLClientSocket class. 304 uint16 supported_version_max = config->version_max; 305 config->version_max = std::min(supported_version_max, version_max); 306 } 307 if (version_fallback_min) { 308 config->version_fallback_min = version_fallback_min; 309 } 310 config->disabled_cipher_suites = disabled_cipher_suites_; 311 // disabling False Start also happens to disable record splitting. 312 config->false_start_enabled = !ssl_record_splitting_disabled_.GetValue(); 313} 314 315void SSLConfigServiceManagerPref::OnDisabledCipherSuitesChange( 316 PrefService* local_state) { 317 const base::ListValue* value = 318 local_state->GetList(prefs::kCipherSuiteBlacklist); 319 disabled_cipher_suites_ = ParseCipherSuites(ListValueToStringVector(value)); 320} 321 322//////////////////////////////////////////////////////////////////////////////// 323// SSLConfigServiceManager 324 325// static 326SSLConfigServiceManager* SSLConfigServiceManager::CreateDefaultManager( 327 PrefService* local_state) { 328 return new SSLConfigServiceManagerPref(local_state); 329} 330 331// static 332void SSLConfigServiceManager::RegisterPrefs(PrefRegistrySimple* registry) { 333 SSLConfigServiceManagerPref::RegisterPrefs(registry); 334} 335