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 5 #include "chrome/browser/enumerate_modules_model_win.h" 6 7 #include <Tlhelp32.h> 8 #include <wintrust.h> 9 #include <algorithm> 10 11 #include "base/bind.h" 12 #include "base/command_line.h" 13 #include "base/environment.h" 14 #include "base/file_version_info_win.h" 15 #include "base/files/file_path.h" 16 #include "base/i18n/case_conversion.h" 17 #include "base/metrics/histogram.h" 18 #include "base/strings/string_number_conversions.h" 19 #include "base/strings/string_util.h" 20 #include "base/strings/utf_string_conversions.h" 21 #include "base/time/time.h" 22 #include "base/values.h" 23 #include "base/version.h" 24 #include "base/win/registry.h" 25 #include "base/win/scoped_handle.h" 26 #include "base/win/windows_version.h" 27 #include "chrome/browser/chrome_notification_types.h" 28 #include "chrome/browser/net/service_providers_win.h" 29 #include "chrome/common/chrome_constants.h" 30 #include "chrome/common/chrome_switches.h" 31 #include "content/public/browser/notification_service.h" 32 #include "crypto/sha2.h" 33 #include "grit/generated_resources.h" 34 #include "grit/google_chrome_strings.h" 35 #include "ui/base/l10n/l10n_util.h" 36 37 using content::BrowserThread; 38 39 // The period of time (in milliseconds) to wait until checking to see if any 40 // incompatible modules exist. 41 static const int kModuleCheckDelayMs = 45 * 1000; 42 43 // The path to the Shell Extension key in the Windows registry. 44 static const wchar_t kRegPath[] = 45 L"Software\\Microsoft\\Windows\\CurrentVersion\\Shell Extensions\\Approved"; 46 47 // Short-hand for things on the blacklist you should simply get rid of. 48 static const ModuleEnumerator::RecommendedAction kUninstallLink = 49 static_cast<ModuleEnumerator::RecommendedAction>( 50 ModuleEnumerator::UNINSTALL | ModuleEnumerator::SEE_LINK); 51 52 // Short-hand for things on the blacklist we are investigating and have info. 53 static const ModuleEnumerator::RecommendedAction kInvestigatingLink = 54 static_cast<ModuleEnumerator::RecommendedAction>( 55 ModuleEnumerator::INVESTIGATING | ModuleEnumerator::SEE_LINK); 56 57 // A sort method that sorts by bad modules first, then by full name (including 58 // path). 59 static bool ModuleSort(const ModuleEnumerator::Module& a, 60 const ModuleEnumerator::Module& b) { 61 if (a.status != b.status) 62 return a.status > b.status; 63 64 if (a.location == b.location) 65 return a.name < b.name; 66 67 return a.location < b.location; 68 } 69 70 namespace { 71 72 // Used to protect the LoadedModuleVector which is accessed 73 // from both the UI thread and the FILE thread. 74 base::Lock* lock = NULL; 75 76 // A struct to help de-duping modules before adding them to the enumerated 77 // modules vector. 78 struct FindModule { 79 public: 80 explicit FindModule(const ModuleEnumerator::Module& x) 81 : module(x) {} 82 bool operator()(const ModuleEnumerator::Module& module_in) const { 83 return (module.location == module_in.location) && 84 (module.name == module_in.name); 85 } 86 87 const ModuleEnumerator::Module& module; 88 }; 89 90 // Returns the long path name given a short path name. A short path name is a 91 // path that follows the 8.3 convention and has ~x in it. If the path is already 92 // a long path name, the function returns the current path without modification. 93 bool ConvertToLongPath(const string16& short_path, string16* long_path) { 94 wchar_t long_path_buf[MAX_PATH]; 95 DWORD return_value = GetLongPathName(short_path.c_str(), long_path_buf, 96 MAX_PATH); 97 if (return_value != 0 && return_value < MAX_PATH) { 98 *long_path = long_path_buf; 99 return true; 100 } 101 102 return false; 103 } 104 105 } // namespace 106 107 // The browser process module blacklist. This lists modules that are known 108 // to cause compatibility issues within the browser process. When adding to this 109 // list, make sure that all paths are lower-case, in long pathname form, end 110 // with a slash and use environments variables (or just look at one of the 111 // comments below and keep it consistent with that). When adding an entry with 112 // an environment variable not currently used in the list below, make sure to 113 // update the list in PreparePathMappings. Filename, Description/Signer, and 114 // Location must be entered as hashes (see GenerateHash). Filename is mandatory. 115 // Entries without any Description, Signer info, or Location will never be 116 // marked as confirmed bad (only as suspicious). 117 const ModuleEnumerator::BlacklistEntry ModuleEnumerator::kModuleBlacklist[] = { 118 // NOTE: Please keep this list sorted by dll name, then location. 119 120 // Version 3.2.1.6 seems to be implicated in most cases (and 3.2.2.2 in some). 121 // There is a more recent version available for download. 122 // accelerator.dll, "%programfiles%\\speedbit video accelerator\\". 123 { "7ba9402f", "c9132d48", "", "", "", ALL, kInvestigatingLink }, 124 125 // apiqq0.dll, "%temp%\\". 126 { "26134911", "59145acf", "", "", "", ALL, kUninstallLink }, 127 128 // arking0.dll, "%systemroot%\\system32\\". 129 { "f5d8f549", "23d01d5b", "", "", "", ALL, kUninstallLink }, 130 131 // arking1.dll, "%systemroot%\\system32\\". 132 { "c60ca062", "23d01d5b", "", "", "", ALL, kUninstallLink }, 133 134 // aswjsflt.dll, "%ProgramFiles%\\avast software\\avast\\", "AVAST Software". 135 // NOTE: The digital signature of the DLL is double null terminated. 136 // Avast Antivirus prior to version 8.0 would kill the Chrome child process 137 // when blocked from running. 138 { "2ea5422a", "6b3a1b00", "a7db0e0c", "", "8.0", XP, 139 static_cast<RecommendedAction>(UPDATE | SEE_LINK | NOTIFY_USER) }, 140 141 // aswjsflt.dll, "%ProgramFiles%\\alwil software\\avast5\\", "AVAST Software". 142 // NOTE: The digital signature of the DLL is double null terminated. 143 // Avast Antivirus prior to version 8.0 would kill the Chrome child process 144 // when blocked from running. 145 { "2ea5422a", "d8686924", "a7db0e0c", "", "8.0", XP, 146 static_cast<RecommendedAction>(UPDATE | SEE_LINK | NOTIFY_USER) }, 147 148 // Said to belong to Killer NIC from BigFoot Networks (not verified). Versions 149 // 6.0.0.7 and 6.0.0.10 implicated. 150 // bfllr.dll, "%systemroot%\\system32\\". 151 { "6bb57633", "23d01d5b", "", "", "", ALL, kInvestigatingLink }, 152 153 // clickpotatolitesahook.dll, "". Different version each report. 154 { "0396e037.dll", "", "", "", "", ALL, kUninstallLink }, 155 156 // cvasds0.dll, "%temp%\\". 157 { "5ce0037c", "59145acf", "", "", "", ALL, kUninstallLink }, 158 159 // cwalsp.dll, "%systemroot%\\system32\\". 160 { "e579a039", "23d01d5b", "", "", "", ALL, kUninstallLink }, 161 162 // datamngr.dll (1), "%programfiles%\\searchqu toolbar\\datamngr\\". 163 { "7add320b", "470a3da3", "", "", "", ALL, kUninstallLink }, 164 165 // datamngr.dll (2), "%programfiles%\\windows searchqu toolbar\\". 166 { "7add320b", "7a3c8be3", "", "", "", ALL, kUninstallLink }, 167 168 // dsoqq0.dll, "%temp%\\". 169 { "1c4df325", "59145acf", "", "", "", ALL, kUninstallLink }, 170 171 // flt.dll, "%programfiles%\\tueagles\\". 172 { "6d01f4a1", "7935e9c2", "", "", "", ALL, kUninstallLink }, 173 174 // This looks like a malware edition of a Brazilian Bank plugin, sometimes 175 // referred to as Malware.Banc.A. 176 // gbieh.dll, "%programfiles%\\gbplugin\\". 177 { "4cb4f2e3", "88e4a3b1", "", "", "", ALL, kUninstallLink }, 178 179 // hblitesahook.dll. Each report has different version number in location. 180 { "5d10b363", "", "", "", "", ALL, kUninstallLink }, 181 182 // icf.dll, "%systemroot%\\system32\\". 183 { "303825ed", "23d01d5b", "", "", "", ALL, INVESTIGATING }, 184 185 // idmmbc.dll (IDM), "%systemroot%\\system32\\". See: http://crbug.com/26892/. 186 { "b8dce5c3", "23d01d5b", "", "", "6.03", ALL, 187 static_cast<RecommendedAction>(UPDATE | DISABLE) }, 188 189 // imon.dll (NOD32), "%systemroot%\\system32\\". See: http://crbug.com/21715. 190 { "8f42f22e", "23d01d5b", "", "", "4.0", ALL, 191 static_cast<RecommendedAction>(UPDATE | DISABLE) }, 192 193 // is3lsp.dll, "%commonprogramfiles%\\is3\\anti-spyware\\". 194 { "7ffbdce9", "bc5673f2", "", "", "", ALL, 195 static_cast<RecommendedAction>(UPDATE | DISABLE | SEE_LINK) }, 196 197 // jsi.dll, "%programfiles%\\profilecraze\\". 198 { "f9555eea", "e3548061", "", "", "", ALL, kUninstallLink }, 199 200 // kernel.dll, "%programfiles%\\contentwatch\\internet protection\\modules\\". 201 { "ead2768e", "4e61ce60", "", "", "", ALL, INVESTIGATING }, 202 203 // mgking0.dll, "%systemroot%\\system32\\". 204 { "d0893e38", "23d01d5b", "", "", "", ALL, kUninstallLink }, 205 206 // mgking0.dll, "%temp%\\". 207 { "d0893e38", "59145acf", "", "", "", ALL, kUninstallLink }, 208 209 // mgking1.dll, "%systemroot%\\system32\\". 210 { "3e837222", "23d01d5b", "", "", "", ALL, kUninstallLink }, 211 212 // mgking1.dll, "%temp%\\". 213 { "3e837222", "59145acf", "", "", "", ALL, kUninstallLink }, 214 215 // mstcipha.ime, "%systemroot%\\system32\\". 216 { "5523579e", "23d01d5b", "", "", "", ALL, INVESTIGATING }, 217 218 // mwtsp.dll, "%systemroot%\\system32\\". 219 { "9830bff6", "23d01d5b", "", "", "", ALL, kUninstallLink }, 220 221 // nodqq0.dll, "%temp%\\". 222 { "b86ce04d", "59145acf", "", "", "", ALL, kUninstallLink }, 223 224 // nProtect GameGuard Anti-cheat system. Every report has a different 225 // location, since it is installed into and run from a game folder. Various 226 // versions implicated. 227 // npggnt.des, no fixed location. 228 { "f2c8790d", "", "", "", "", ALL, kInvestigatingLink }, 229 230 // nvlsp.dll, 231 // "%programfiles%\\nvidia corporation\\networkaccessmanager\\bin32\\". 232 { "37f907e2", "3ad0ff23", "", "", "", ALL, INVESTIGATING }, 233 234 // post0.dll, "%systemroot%\\system32\\". 235 { "7405c0c8", "23d01d5b", "", "", "", ALL, kUninstallLink }, 236 237 // questbrwsearch.dll, "%programfiles%\\questbrwsearch\\". 238 { "0953ed09", "f0d5eeda", "", "", "", ALL, kUninstallLink }, 239 240 // questscan.dll, "%programfiles%\\questscan\\". 241 { "f4f3391e", "119d20f7", "", "", "", ALL, kUninstallLink }, 242 243 // radhslib.dll (Naomi web filter), "%programfiles%\\rnamfler\\". 244 // See http://crbug.com/12517. 245 { "7edcd250", "0733dc3e", "", "", "", ALL, INVESTIGATING }, 246 247 // rlls.dll, "%programfiles%\\relevantknowledge\\". 248 { "a1ed94a7", "ea9d6b36", "", "", "", ALL, kUninstallLink }, 249 250 // rooksdol.dll, "%programfiles%\\trusteer\\rapport\\bin\\". 251 { "802aefef", "06120e13", "", "", "3.5.1008.40", ALL, UPDATE }, 252 253 // scanquery.dll, "%programfiles%\\scanquery\\". 254 { "0b52d2ae", "a4cc88b1", "", "", "", ALL, kUninstallLink }, 255 256 // sdata.dll, "%programdata%\\srtserv\\". 257 { "1936d5cc", "223c44be", "", "", "", ALL, kUninstallLink }, 258 259 // searchtree.dll, 260 // "%programfiles%\\contentwatch\\internet protection\\modules\\". 261 { "f6915a31", "4e61ce60", "", "", "", ALL, INVESTIGATING }, 262 263 // sgprxy.dll, "%commonprogramfiles%\\is3\\anti-spyware\\". 264 { "005965ea", "bc5673f2", "", "", "", ALL, INVESTIGATING }, 265 266 // snxhk.dll, "%ProgramFiles%\\avast software\\avast\\", "AVAST Software". 267 // NOTE: The digital signature of the DLL is double null terminated. 268 // Avast Antivirus prior to version 8.0 would kill the Chrome child process 269 // when blocked from running. 270 { "46c16aa8", "6b3a1b00", "a7db0e0c", "", "8.0", XP, 271 static_cast<RecommendedAction>(UPDATE | SEE_LINK | NOTIFY_USER) }, 272 273 // snxhk.dll, "%ProgramFiles%\\alwil software\\avast5\\", "AVAST Software". 274 // NOTE: The digital signature of the DLL is double null terminated. 275 // Avast Antivirus prior to version 8.0 would kill the Chrome child process 276 // when blocked from running. 277 { "46c16aa8", "d8686924", "a7db0e0c", "", "8.0", XP, 278 static_cast<RecommendedAction>(UPDATE | SEE_LINK | NOTIFY_USER) }, 279 280 // sprotector.dll, "". Different location each report. 281 { "24555d74", "", "", "", "", ALL, kUninstallLink }, 282 283 // swi_filter_0001.dll (Sophos Web Intelligence), 284 // "%programfiles%\\sophos\\sophos anti-virus\\web intelligence\\". 285 // A small random sample all showed version 1.0.5.0. 286 { "61112d7b", "25fb120f", "", "", "", ALL, kInvestigatingLink }, 287 288 // twking0.dll, "%systemroot%\\system32\\". 289 { "0355549b", "23d01d5b", "", "", "", ALL, kUninstallLink }, 290 291 // twking1.dll, "%systemroot%\\system32\\". 292 { "02e44508", "23d01d5b", "", "", "", ALL, kUninstallLink }, 293 294 // vksaver.dll, "%systemroot%\\system32\\". 295 { "c4a784d5", "23d01d5b", "", "", "", ALL, kUninstallLink }, 296 297 // vlsp.dll (Venturi Firewall?), "%systemroot%\\system32\\". 298 { "2e4eb93d", "23d01d5b", "", "", "", ALL, INVESTIGATING }, 299 300 // vmn3_1dn.dll, "%appdata%\\roaming\\vmndtxtb\\". 301 { "bba2037d", "9ab68585", "", "", "", ALL, kUninstallLink }, 302 303 // webanalyzer.dll, 304 // "%programfiles%\\contentwatch\\internet protection\\modules\\". 305 { "c70b697d", "4e61ce60", "", "", "", ALL, INVESTIGATING }, 306 307 // wowst0.dll, "%systemroot%\\system32\\". 308 { "38ad9963", "23d01d5b", "", "", "", ALL, kUninstallLink }, 309 310 // wxbase28u_vc_cw.dll, "%systemroot%\\system32\\". 311 { "e967210d", "23d01d5b", "", "", "", ALL, kUninstallLink }, 312 }; 313 314 // Generates an 8 digit hash from the input given. 315 static void GenerateHash(const std::string& input, std::string* output) { 316 if (input.empty()) { 317 *output = ""; 318 return; 319 } 320 321 uint8 hash[4]; 322 crypto::SHA256HashString(input, hash, sizeof(hash)); 323 *output = StringToLowerASCII(base::HexEncode(hash, sizeof(hash))); 324 } 325 326 // ----------------------------------------------------------------------------- 327 328 // static 329 void ModuleEnumerator::NormalizeModule(Module* module) { 330 string16 path = module->location; 331 if (!ConvertToLongPath(path, &module->location)) 332 module->location = path; 333 334 module->location = base::i18n::ToLower(module->location); 335 336 // Location contains the filename, so the last slash is where the path 337 // ends. 338 size_t last_slash = module->location.find_last_of(L"\\"); 339 if (last_slash != string16::npos) { 340 module->name = module->location.substr(last_slash + 1); 341 module->location = module->location.substr(0, last_slash + 1); 342 } else { 343 module->name = module->location; 344 module->location.clear(); 345 } 346 347 // Some version strings have things like (win7_rtm.090713-1255) appended 348 // to them. Remove that. 349 size_t first_space = module->version.find_first_of(L" "); 350 if (first_space != string16::npos) 351 module->version = module->version.substr(0, first_space); 352 353 module->normalized = true; 354 } 355 356 // static 357 ModuleEnumerator::ModuleStatus ModuleEnumerator::Match( 358 const ModuleEnumerator::Module& module, 359 const ModuleEnumerator::BlacklistEntry& blacklisted) { 360 // All modules must be normalized before matching against blacklist. 361 DCHECK(module.normalized); 362 // Filename is mandatory and version should not contain spaces. 363 DCHECK(strlen(blacklisted.filename) > 0); 364 DCHECK(!strstr(blacklisted.version_from, " ")); 365 DCHECK(!strstr(blacklisted.version_to, " ")); 366 367 base::win::Version version = base::win::GetVersion(); 368 switch (version) { 369 case base::win::VERSION_XP: 370 if (!(blacklisted.os & XP)) return NOT_MATCHED; 371 break; 372 default: 373 break; 374 } 375 376 std::string filename_hash, location_hash; 377 GenerateHash(WideToUTF8(module.name), &filename_hash); 378 GenerateHash(WideToUTF8(module.location), &location_hash); 379 380 // Filenames are mandatory. Location is mandatory if given. 381 if (filename_hash == blacklisted.filename && 382 (std::string(blacklisted.location).empty() || 383 location_hash == blacklisted.location)) { 384 // We have a name match against the blacklist (and possibly location match 385 // also), so check version. 386 Version module_version(UTF16ToASCII(module.version)); 387 Version version_min(blacklisted.version_from); 388 Version version_max(blacklisted.version_to); 389 bool version_ok = !version_min.IsValid() && !version_max.IsValid(); 390 if (!version_ok) { 391 bool too_low = version_min.IsValid() && 392 (!module_version.IsValid() || 393 module_version.CompareTo(version_min) < 0); 394 bool too_high = version_max.IsValid() && 395 (!module_version.IsValid() || 396 module_version.CompareTo(version_max) >= 0); 397 version_ok = !too_low && !too_high; 398 } 399 400 if (version_ok) { 401 // At this point, the names match and there is no version specified 402 // or the versions also match. 403 404 std::string desc_or_signer(blacklisted.desc_or_signer); 405 std::string signer_hash, description_hash; 406 GenerateHash(WideToUTF8(module.digital_signer), &signer_hash); 407 GenerateHash(WideToUTF8(module.description), &description_hash); 408 409 // If signatures match (or both are empty), then we have a winner. 410 if (signer_hash == desc_or_signer) 411 return CONFIRMED_BAD; 412 413 // If descriptions match (or both are empty) and the locations match, then 414 // we also have a confirmed match. 415 if (description_hash == desc_or_signer && 416 !location_hash.empty() && location_hash == blacklisted.location) 417 return CONFIRMED_BAD; 418 419 // We are not sure, but it is likely bad. 420 return SUSPECTED_BAD; 421 } 422 } 423 424 return NOT_MATCHED; 425 } 426 427 ModuleEnumerator::ModuleEnumerator(EnumerateModulesModel* observer) 428 : enumerated_modules_(NULL), 429 observer_(observer), 430 limited_mode_(false), 431 callback_thread_id_(BrowserThread::ID_COUNT) { 432 } 433 434 ModuleEnumerator::~ModuleEnumerator() { 435 } 436 437 void ModuleEnumerator::ScanNow(ModulesVector* list, bool limited_mode) { 438 enumerated_modules_ = list; 439 440 limited_mode_ = limited_mode; 441 442 if (!limited_mode_) { 443 CHECK(BrowserThread::GetCurrentThreadIdentifier(&callback_thread_id_)); 444 DCHECK(!BrowserThread::CurrentlyOn(BrowserThread::FILE)); 445 BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, 446 base::Bind(&ModuleEnumerator::ScanImpl, this)); 447 } else { 448 // Run it synchronously. 449 ScanImpl(); 450 } 451 } 452 453 void ModuleEnumerator::ScanImpl() { 454 base::TimeTicks start_time = base::TimeTicks::Now(); 455 456 enumerated_modules_->clear(); 457 458 // Make sure the path mapping vector is setup so we can collapse paths. 459 PreparePathMappings(); 460 461 // Enumerating loaded modules must happen first since the other types of 462 // modules check for duplication against the loaded modules. 463 base::TimeTicks checkpoint = base::TimeTicks::Now(); 464 EnumerateLoadedModules(); 465 base::TimeTicks checkpoint2 = base::TimeTicks::Now(); 466 UMA_HISTOGRAM_TIMES("Conflicts.EnumerateLoadedModules", 467 checkpoint2 - checkpoint); 468 469 checkpoint = checkpoint2; 470 EnumerateShellExtensions(); 471 checkpoint2 = base::TimeTicks::Now(); 472 UMA_HISTOGRAM_TIMES("Conflicts.EnumerateShellExtensions", 473 checkpoint2 - checkpoint); 474 475 checkpoint = checkpoint2; 476 EnumerateWinsockModules(); 477 checkpoint2 = base::TimeTicks::Now(); 478 UMA_HISTOGRAM_TIMES("Conflicts.EnumerateWinsockModules", 479 checkpoint2 - checkpoint); 480 481 MatchAgainstBlacklist(); 482 483 std::sort(enumerated_modules_->begin(), 484 enumerated_modules_->end(), ModuleSort); 485 486 if (!limited_mode_) { 487 // Send a reply back on the UI thread. 488 BrowserThread::PostTask(callback_thread_id_, FROM_HERE, 489 base::Bind(&ModuleEnumerator::ReportBack, this)); 490 } else { 491 // We are on the main thread already. 492 ReportBack(); 493 } 494 495 UMA_HISTOGRAM_TIMES("Conflicts.EnumerationTotalTime", 496 base::TimeTicks::Now() - start_time); 497 } 498 499 void ModuleEnumerator::EnumerateLoadedModules() { 500 // Get all modules in the current process. 501 base::win::ScopedHandle snap(::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, 502 ::GetCurrentProcessId())); 503 if (!snap.Get()) 504 return; 505 506 // Walk the module list. 507 MODULEENTRY32 module = { sizeof(module) }; 508 if (!::Module32First(snap.Get(), &module)) 509 return; 510 511 do { 512 // It would be weird to present chrome.exe as a loaded module. 513 if (_wcsicmp(chrome::kBrowserProcessExecutableName, module.szModule) == 0) 514 continue; 515 516 Module entry; 517 entry.type = LOADED_MODULE; 518 entry.location = module.szExePath; 519 PopulateModuleInformation(&entry); 520 521 NormalizeModule(&entry); 522 CollapsePath(&entry); 523 enumerated_modules_->push_back(entry); 524 } while (::Module32Next(snap.Get(), &module)); 525 } 526 527 void ModuleEnumerator::EnumerateShellExtensions() { 528 ReadShellExtensions(HKEY_LOCAL_MACHINE); 529 ReadShellExtensions(HKEY_CURRENT_USER); 530 } 531 532 void ModuleEnumerator::ReadShellExtensions(HKEY parent) { 533 base::win::RegistryValueIterator registration(parent, kRegPath); 534 while (registration.Valid()) { 535 std::wstring key(std::wstring(L"CLSID\\") + registration.Name() + 536 L"\\InProcServer32"); 537 base::win::RegKey clsid; 538 if (clsid.Open(HKEY_CLASSES_ROOT, key.c_str(), KEY_READ) != ERROR_SUCCESS) { 539 ++registration; 540 continue; 541 } 542 string16 dll; 543 if (clsid.ReadValue(L"", &dll) != ERROR_SUCCESS) { 544 ++registration; 545 continue; 546 } 547 clsid.Close(); 548 549 Module entry; 550 entry.type = SHELL_EXTENSION; 551 entry.location = dll; 552 PopulateModuleInformation(&entry); 553 554 NormalizeModule(&entry); 555 CollapsePath(&entry); 556 AddToListWithoutDuplicating(entry); 557 558 ++registration; 559 } 560 } 561 562 void ModuleEnumerator::EnumerateWinsockModules() { 563 // Add to this list the Winsock LSP DLLs. 564 WinsockLayeredServiceProviderList layered_providers; 565 GetWinsockLayeredServiceProviders(&layered_providers); 566 for (size_t i = 0; i < layered_providers.size(); ++i) { 567 Module entry; 568 entry.type = WINSOCK_MODULE_REGISTRATION; 569 entry.status = NOT_MATCHED; 570 entry.normalized = false; 571 entry.location = layered_providers[i].path; 572 entry.description = layered_providers[i].name; 573 entry.recommended_action = NONE; 574 entry.duplicate_count = 0; 575 576 wchar_t expanded[MAX_PATH]; 577 DWORD size = ExpandEnvironmentStrings( 578 entry.location.c_str(), expanded, MAX_PATH); 579 if (size != 0 && size <= MAX_PATH) { 580 entry.digital_signer = 581 GetSubjectNameFromDigitalSignature(base::FilePath(expanded)); 582 } 583 entry.version = base::IntToString16(layered_providers[i].version); 584 585 // Paths have already been collapsed. 586 NormalizeModule(&entry); 587 AddToListWithoutDuplicating(entry); 588 } 589 } 590 591 void ModuleEnumerator::PopulateModuleInformation(Module* module) { 592 module->status = NOT_MATCHED; 593 module->duplicate_count = 0; 594 module->normalized = false; 595 module->digital_signer = 596 GetSubjectNameFromDigitalSignature(base::FilePath(module->location)); 597 module->recommended_action = NONE; 598 scoped_ptr<FileVersionInfo> version_info( 599 FileVersionInfo::CreateFileVersionInfo(base::FilePath(module->location))); 600 if (version_info.get()) { 601 FileVersionInfoWin* version_info_win = 602 static_cast<FileVersionInfoWin*>(version_info.get()); 603 604 VS_FIXEDFILEINFO* fixed_file_info = version_info_win->fixed_file_info(); 605 if (fixed_file_info) { 606 module->description = version_info_win->file_description(); 607 module->version = version_info_win->file_version(); 608 module->product_name = version_info_win->product_name(); 609 } 610 } 611 } 612 613 void ModuleEnumerator::AddToListWithoutDuplicating(const Module& module) { 614 DCHECK(module.normalized); 615 // These are registered modules, not loaded modules so the same module 616 // can be registered multiple times, often dozens of times. There is no need 617 // to list each registration, so we just increment the count for each module 618 // that is counted multiple times. 619 ModulesVector::iterator iter; 620 iter = std::find_if(enumerated_modules_->begin(), 621 enumerated_modules_->end(), 622 FindModule(module)); 623 if (iter != enumerated_modules_->end()) { 624 iter->duplicate_count++; 625 iter->type = static_cast<ModuleType>(iter->type | module.type); 626 } else { 627 enumerated_modules_->push_back(module); 628 } 629 } 630 631 void ModuleEnumerator::PreparePathMappings() { 632 path_mapping_.clear(); 633 634 scoped_ptr<base::Environment> environment(base::Environment::Create()); 635 std::vector<string16> env_vars; 636 env_vars.push_back(L"LOCALAPPDATA"); 637 env_vars.push_back(L"ProgramFiles"); 638 env_vars.push_back(L"ProgramData"); 639 env_vars.push_back(L"USERPROFILE"); 640 env_vars.push_back(L"SystemRoot"); 641 env_vars.push_back(L"TEMP"); 642 env_vars.push_back(L"TMP"); 643 env_vars.push_back(L"CommonProgramFiles"); 644 for (std::vector<string16>::const_iterator variable = env_vars.begin(); 645 variable != env_vars.end(); ++variable) { 646 std::string path; 647 if (environment->GetVar(WideToASCII(*variable).c_str(), &path)) { 648 path_mapping_.push_back( 649 std::make_pair(base::i18n::ToLower(UTF8ToUTF16(path)) + L"\\", 650 L"%" + base::i18n::ToLower(*variable) + L"%")); 651 } 652 } 653 } 654 655 void ModuleEnumerator::CollapsePath(Module* entry) { 656 // Take the path and see if we can use any of the substitution values 657 // from the vector constructed above to replace c:\windows with, for 658 // example, %systemroot%. The most collapsed path (the one with the 659 // minimum length) wins. 660 size_t min_length = MAXINT; 661 string16 location = entry->location; 662 for (PathMapping::const_iterator mapping = path_mapping_.begin(); 663 mapping != path_mapping_.end(); ++mapping) { 664 string16 prefix = mapping->first; 665 if (StartsWith(location, prefix, false)) { 666 string16 new_location = mapping->second + 667 location.substr(prefix.length() - 1); 668 size_t length = new_location.length() - mapping->second.length(); 669 if (length < min_length) { 670 entry->location = new_location; 671 min_length = length; 672 } 673 } 674 } 675 } 676 677 void ModuleEnumerator::MatchAgainstBlacklist() { 678 for (size_t m = 0; m < enumerated_modules_->size(); ++m) { 679 // Match this module against the blacklist. 680 Module* module = &(*enumerated_modules_)[m]; 681 module->status = GOOD; // We change this below potentially. 682 for (size_t i = 0; i < arraysize(kModuleBlacklist); ++i) { 683 #if !defined(NDEBUG) 684 // This saves time when constructing the blacklist. 685 std::string hashes(kModuleBlacklist[i].filename); 686 std::string hash1, hash2, hash3; 687 GenerateHash(kModuleBlacklist[i].filename, &hash1); 688 hashes += " - " + hash1; 689 GenerateHash(kModuleBlacklist[i].location, &hash2); 690 hashes += " - " + hash2; 691 GenerateHash(kModuleBlacklist[i].desc_or_signer, &hash3); 692 hashes += " - " + hash3; 693 #endif 694 695 ModuleStatus status = Match(*module, kModuleBlacklist[i]); 696 if (status != NOT_MATCHED) { 697 // We have a match against the blacklist. Mark it as such. 698 module->status = status; 699 module->recommended_action = kModuleBlacklist[i].help_tip; 700 break; 701 } 702 } 703 704 // Modules loaded from these locations are frequently malicious 705 // and notorious for changing frequently so they are not good candidates 706 // for blacklisting individually. Mark them as suspicious if we haven't 707 // classified them as bad yet. 708 if (module->status == NOT_MATCHED || module->status == GOOD) { 709 if (StartsWith(module->location, L"%temp%", false) || 710 StartsWith(module->location, L"%tmp%", false)) { 711 module->status = SUSPECTED_BAD; 712 } 713 } 714 } 715 } 716 717 void ModuleEnumerator::ReportBack() { 718 if (!limited_mode_) 719 DCHECK(BrowserThread::CurrentlyOn(callback_thread_id_)); 720 observer_->DoneScanning(); 721 } 722 723 string16 ModuleEnumerator::GetSubjectNameFromDigitalSignature( 724 const base::FilePath& filename) { 725 HCERTSTORE store = NULL; 726 HCRYPTMSG message = NULL; 727 728 // Find the crypto message for this filename. 729 bool result = !!CryptQueryObject(CERT_QUERY_OBJECT_FILE, 730 filename.value().c_str(), 731 CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_EMBED, 732 CERT_QUERY_FORMAT_FLAG_BINARY, 733 0, 734 NULL, 735 NULL, 736 NULL, 737 &store, 738 &message, 739 NULL); 740 if (!result) 741 return string16(); 742 743 // Determine the size of the signer info data. 744 DWORD signer_info_size = 0; 745 result = !!CryptMsgGetParam(message, 746 CMSG_SIGNER_INFO_PARAM, 747 0, 748 NULL, 749 &signer_info_size); 750 if (!result) 751 return string16(); 752 753 // Allocate enough space to hold the signer info. 754 scoped_ptr<BYTE[]> signer_info_buffer(new BYTE[signer_info_size]); 755 CMSG_SIGNER_INFO* signer_info = 756 reinterpret_cast<CMSG_SIGNER_INFO*>(signer_info_buffer.get()); 757 758 // Obtain the signer info. 759 result = !!CryptMsgGetParam(message, 760 CMSG_SIGNER_INFO_PARAM, 761 0, 762 signer_info, 763 &signer_info_size); 764 if (!result) 765 return string16(); 766 767 // Search for the signer certificate. 768 CERT_INFO CertInfo = {0}; 769 PCCERT_CONTEXT cert_context = NULL; 770 CertInfo.Issuer = signer_info->Issuer; 771 CertInfo.SerialNumber = signer_info->SerialNumber; 772 773 cert_context = CertFindCertificateInStore( 774 store, 775 X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, 776 0, 777 CERT_FIND_SUBJECT_CERT, 778 &CertInfo, 779 NULL); 780 if (!cert_context) 781 return string16(); 782 783 // Determine the size of the Subject name. 784 DWORD subject_name_size = 0; 785 if (!(subject_name_size = CertGetNameString(cert_context, 786 CERT_NAME_SIMPLE_DISPLAY_TYPE, 787 0, 788 NULL, 789 NULL, 790 0))) { 791 return string16(); 792 } 793 794 string16 subject_name; 795 subject_name.resize(subject_name_size); 796 797 // Get subject name. 798 if (!(CertGetNameString(cert_context, 799 CERT_NAME_SIMPLE_DISPLAY_TYPE, 800 0, 801 NULL, 802 const_cast<LPWSTR>(subject_name.c_str()), 803 subject_name_size))) { 804 return string16(); 805 } 806 807 return subject_name; 808 } 809 810 // ---------------------------------------------------------------------------- 811 812 // static 813 EnumerateModulesModel* EnumerateModulesModel::GetInstance() { 814 return Singleton<EnumerateModulesModel>::get(); 815 } 816 817 // static 818 void EnumerateModulesModel::RecordLearnMoreStat(bool from_menu) { 819 UMA_HISTOGRAM_ENUMERATION("ConflictingModule.UserSelection", 820 from_menu ? ACTION_MENU_LEARN_MORE : ACTION_BUBBLE_LEARN_MORE, 821 ACTION_BOUNDARY); 822 } 823 824 bool EnumerateModulesModel::ShouldShowConflictWarning() const { 825 // If the user has acknowledged the conflict notification, then we don't need 826 // to show it again (because the scanning only happens once per the lifetime 827 // of the process). If we were to run the scanning more than once, then we'd 828 // need to clear the flag somewhere when we are ready to show it again. 829 if (conflict_notification_acknowledged_) 830 return false; 831 832 return confirmed_bad_modules_detected_ > 0; 833 } 834 835 void EnumerateModulesModel::AcknowledgeConflictNotification() { 836 if (!conflict_notification_acknowledged_) { 837 conflict_notification_acknowledged_ = true; 838 content::NotificationService::current()->Notify( 839 chrome::NOTIFICATION_MODULE_INCOMPATIBILITY_BADGE_CHANGE, 840 content::Source<EnumerateModulesModel>(this), 841 content::NotificationService::NoDetails()); 842 } 843 } 844 845 void EnumerateModulesModel::ScanNow() { 846 if (scanning_) 847 return; // A scan is already in progress. 848 849 lock->Acquire(); // Balanced in DoneScanning(); 850 851 scanning_ = true; 852 853 // Instruct the ModuleEnumerator class to load this on the File thread. 854 // ScanNow does not block. 855 if (!module_enumerator_) 856 module_enumerator_ = new ModuleEnumerator(this); 857 module_enumerator_->ScanNow(&enumerated_modules_, limited_mode_); 858 } 859 860 ListValue* EnumerateModulesModel::GetModuleList() const { 861 if (scanning_) 862 return NULL; 863 864 lock->Acquire(); 865 866 if (enumerated_modules_.empty()) { 867 lock->Release(); 868 return NULL; 869 } 870 871 ListValue* list = new ListValue(); 872 873 for (ModuleEnumerator::ModulesVector::const_iterator module = 874 enumerated_modules_.begin(); 875 module != enumerated_modules_.end(); ++module) { 876 DictionaryValue* data = new DictionaryValue(); 877 data->SetInteger("type", module->type); 878 string16 type_string; 879 if ((module->type & ModuleEnumerator::LOADED_MODULE) == 0) { 880 // Module is not loaded, denote type of module. 881 if (module->type & ModuleEnumerator::SHELL_EXTENSION) 882 type_string = ASCIIToWide("Shell Extension"); 883 if (module->type & ModuleEnumerator::WINSOCK_MODULE_REGISTRATION) { 884 if (!type_string.empty()) 885 type_string += ASCIIToWide(", "); 886 type_string += ASCIIToWide("Winsock"); 887 } 888 // Must be one of the above type. 889 DCHECK(!type_string.empty()); 890 if (!limited_mode_) { 891 type_string += ASCIIToWide(" -- "); 892 type_string += l10n_util::GetStringUTF16(IDS_CONFLICTS_NOT_LOADED_YET); 893 } 894 } 895 data->SetString("type_description", type_string); 896 data->SetInteger("status", module->status); 897 data->SetString("location", module->location); 898 data->SetString("name", module->name); 899 data->SetString("product_name", module->product_name); 900 data->SetString("description", module->description); 901 data->SetString("version", module->version); 902 data->SetString("digital_signer", module->digital_signer); 903 904 if (!limited_mode_) { 905 // Figure out the possible resolution help string. 906 string16 actions; 907 string16 separator = ASCIIToWide(" ") + l10n_util::GetStringUTF16( 908 IDS_CONFLICTS_CHECK_POSSIBLE_ACTION_SEPERATOR) + 909 ASCIIToWide(" "); 910 911 if (module->recommended_action & ModuleEnumerator::NONE) { 912 actions = l10n_util::GetStringUTF16( 913 IDS_CONFLICTS_CHECK_INVESTIGATING); 914 } 915 if (module->recommended_action & ModuleEnumerator::UNINSTALL) { 916 if (!actions.empty()) 917 actions += separator; 918 actions = l10n_util::GetStringUTF16( 919 IDS_CONFLICTS_CHECK_POSSIBLE_ACTION_UNINSTALL); 920 } 921 if (module->recommended_action & ModuleEnumerator::UPDATE) { 922 if (!actions.empty()) 923 actions += separator; 924 actions += l10n_util::GetStringUTF16( 925 IDS_CONFLICTS_CHECK_POSSIBLE_ACTION_UPDATE); 926 } 927 if (module->recommended_action & ModuleEnumerator::DISABLE) { 928 if (!actions.empty()) 929 actions += separator; 930 actions += l10n_util::GetStringUTF16( 931 IDS_CONFLICTS_CHECK_POSSIBLE_ACTION_DISABLE); 932 } 933 string16 possible_resolution = actions.empty() ? ASCIIToWide("") : 934 l10n_util::GetStringUTF16(IDS_CONFLICTS_CHECK_POSSIBLE_ACTIONS) + 935 ASCIIToWide(" ") + 936 actions; 937 data->SetString("possibleResolution", possible_resolution); 938 data->SetString("help_url", 939 ConstructHelpCenterUrl(*module).spec().c_str()); 940 } 941 942 list->Append(data); 943 } 944 945 lock->Release(); 946 return list; 947 } 948 949 GURL EnumerateModulesModel::GetFirstNotableConflict() { 950 lock->Acquire(); 951 GURL url; 952 953 if (enumerated_modules_.empty()) { 954 lock->Release(); 955 return GURL(); 956 } 957 958 for (ModuleEnumerator::ModulesVector::const_iterator module = 959 enumerated_modules_.begin(); 960 module != enumerated_modules_.end(); ++module) { 961 if (!(module->recommended_action & ModuleEnumerator::NOTIFY_USER)) 962 continue; 963 964 url = ConstructHelpCenterUrl(*module); 965 DCHECK(url.is_valid()); 966 break; 967 } 968 969 lock->Release(); 970 return url; 971 } 972 973 974 EnumerateModulesModel::EnumerateModulesModel() 975 : limited_mode_(false), 976 scanning_(false), 977 conflict_notification_acknowledged_(false), 978 confirmed_bad_modules_detected_(0), 979 suspected_bad_modules_detected_(0), 980 modules_to_notify_about_(0) { 981 lock = new base::Lock(); 982 } 983 984 EnumerateModulesModel::~EnumerateModulesModel() { 985 delete lock; 986 } 987 988 void EnumerateModulesModel::MaybePostScanningTask() { 989 static bool done = false; 990 if (!done) { 991 done = true; 992 993 const CommandLine& cmd_line = *CommandLine::ForCurrentProcess(); 994 if (cmd_line.HasSwitch(switches::kConflictingModulesCheck) || 995 base::win::GetVersion() == base::win::VERSION_XP) { 996 check_modules_timer_.Start(FROM_HERE, 997 base::TimeDelta::FromMilliseconds(kModuleCheckDelayMs), 998 this, &EnumerateModulesModel::ScanNow); 999 } 1000 } 1001 } 1002 1003 void EnumerateModulesModel::DoneScanning() { 1004 confirmed_bad_modules_detected_ = 0; 1005 suspected_bad_modules_detected_ = 0; 1006 modules_to_notify_about_ = 0; 1007 for (ModuleEnumerator::ModulesVector::const_iterator module = 1008 enumerated_modules_.begin(); 1009 module != enumerated_modules_.end(); ++module) { 1010 if (module->status == ModuleEnumerator::CONFIRMED_BAD) { 1011 ++confirmed_bad_modules_detected_; 1012 if (module->recommended_action & ModuleEnumerator::NOTIFY_USER) 1013 ++modules_to_notify_about_; 1014 } else if (module->status == ModuleEnumerator::SUSPECTED_BAD) { 1015 ++suspected_bad_modules_detected_; 1016 if (module->recommended_action & ModuleEnumerator::NOTIFY_USER) 1017 ++modules_to_notify_about_; 1018 } 1019 } 1020 1021 scanning_ = false; 1022 lock->Release(); 1023 1024 UMA_HISTOGRAM_COUNTS_100("Conflicts.SuspectedBadModules", 1025 suspected_bad_modules_detected_); 1026 UMA_HISTOGRAM_COUNTS_100("Conflicts.ConfirmedBadModules", 1027 confirmed_bad_modules_detected_); 1028 1029 // Notifications are not available in limited mode. 1030 if (limited_mode_) 1031 return; 1032 1033 content::NotificationService::current()->Notify( 1034 chrome::NOTIFICATION_MODULE_LIST_ENUMERATED, 1035 content::Source<EnumerateModulesModel>(this), 1036 content::NotificationService::NoDetails()); 1037 1038 // Command line flag must be enabled for the notification to get sent out. 1039 // Otherwise we'd get the badge (while the feature is disabled) when we 1040 // navigate to about:conflicts and find confirmed matches. 1041 const CommandLine& cmd_line = *CommandLine::ForCurrentProcess(); 1042 if (!cmd_line.HasSwitch(switches::kConflictingModulesCheck)) 1043 return; 1044 1045 content::NotificationService::current()->Notify( 1046 chrome::NOTIFICATION_MODULE_INCOMPATIBILITY_BADGE_CHANGE, 1047 content::Source<EnumerateModulesModel>(this), 1048 content::NotificationService::NoDetails()); 1049 } 1050 1051 GURL EnumerateModulesModel::ConstructHelpCenterUrl( 1052 const ModuleEnumerator::Module& module) const { 1053 if (!(module.recommended_action & ModuleEnumerator::SEE_LINK) && 1054 !(module.recommended_action & ModuleEnumerator::NOTIFY_USER)) 1055 return GURL(); 1056 1057 // Construct the needed hashes. 1058 std::string filename, location, description, signer; 1059 GenerateHash(WideToUTF8(module.name), &filename); 1060 GenerateHash(WideToUTF8(module.location), &location); 1061 GenerateHash(WideToUTF8(module.description), &description); 1062 GenerateHash(WideToUTF8(module.digital_signer), &signer); 1063 1064 string16 url = l10n_util::GetStringFUTF16(IDS_HELP_CENTER_VIEW_CONFLICTS, 1065 ASCIIToUTF16(filename), ASCIIToUTF16(location), 1066 ASCIIToUTF16(description), ASCIIToUTF16(signer)); 1067 return GURL(UTF16ToUTF8(url)); 1068 } 1069