| // Copyright (c) 2006-2009 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 "chrome/common/sandbox_policy.h" |
| |
| #include "app/win_util.h" |
| #include "base/command_line.h" |
| #include "base/debug_util.h" |
| #include "base/file_util.h" |
| #include "base/logging.h" |
| #include "base/path_service.h" |
| #include "base/process_util.h" |
| #include "base/registry.h" |
| #include "base/string_util.h" |
| #include "base/win_util.h" |
| #include "chrome/browser/browser_process.h" |
| #include "chrome/common/child_process_info.h" |
| #include "chrome/common/chrome_constants.h" |
| #include "chrome/common/chrome_paths.h" |
| #include "chrome/common/chrome_switches.h" |
| #include "chrome/common/debug_flags.h" |
| #include "sandbox/src/sandbox.h" |
| #include "webkit/glue/plugins/plugin_list.h" |
| |
| #ifdef NACL_WIN64 |
| // The sandbox can be used also by the NaCl broker process. In this case we |
| // define a global variable g_broker_services instead of g_browser_process. |
| // This can be changed if we discover that the broker process needs to be more |
| // similar to the browser process. |
| extern sandbox::BrokerServices* g_broker_services; |
| #endif |
| namespace { |
| |
| // The DLLs listed here are known (or under strong suspicion) of causing crashes |
| // when they are loaded in the renderer. |
| const wchar_t* const kTroublesomeDlls[] = { |
| L"adialhk.dll", // Kaspersky Internet Security. |
| L"acpiz.dll", // Unknown. |
| L"avgrsstx.dll", // AVG 8. |
| L"btkeyind.dll", // Widcomm Bluetooth. |
| L"cmcsyshk.dll", // CMC Internet Security. |
| L"dockshellhook.dll", // Stardock Objectdock. |
| L"GoogleDesktopNetwork3.DLL", // Google Desktop Search v5. |
| L"fwhook.dll", // PC Tools Firewall Plus. |
| L"hookprocesscreation.dll", // Blumentals Program protector. |
| L"hookterminateapis.dll", // Blumentals and Cyberprinter. |
| L"hookprintapis.dll", // Cyberprinter. |
| L"imon.dll", // NOD32 Antivirus. |
| L"ioloHL.dll", // Iolo (System Mechanic). |
| L"kloehk.dll", // Kaspersky Internet Security. |
| L"lawenforcer.dll", // Spyware-Browser AntiSpyware (Spybro). |
| L"libdivx.dll", // DivX. |
| L"lvprcinj01.dll", // Logitech QuickCam. |
| L"madchook.dll", // Madshi (generic hooking library). |
| L"mdnsnsp.dll", // Bonjour. |
| L"moonsysh.dll", // Moon Secure Antivirus. |
| L"npdivx32.dll", // DivX. |
| L"npggNT.des", // GameGuard 2008. |
| L"npggNT.dll", // GameGuard (older). |
| L"oawatch.dll", // Online Armor. |
| L"pavhook.dll", // Panda Internet Security. |
| L"pavshook.dll", // Panda Antivirus. |
| L"pctavhook.dll", // PC Tools Antivirus. |
| L"pctgmhk.dll", // PC Tools Spyware Doctor. |
| L"prntrack.dll", // Pharos Systems. |
| L"radhslib.dll", // Radiant Naomi Internet Filter. |
| L"radprlib.dll", // Radiant Naomi Internet Filter. |
| L"rlhook.dll", // Trustware Bufferzone. |
| L"r3hook.dll", // Kaspersky Internet Security. |
| L"sahook.dll", // McAfee Site Advisor. |
| L"sbrige.dll", // Unknown. |
| L"sc2hook.dll", // Supercopier 2. |
| L"sguard.dll", // Iolo (System Guard). |
| L"smum32.dll", // Spyware Doctor version 6. |
| L"smumhook.dll", // Spyware Doctor version 5. |
| L"ssldivx.dll", // DivX. |
| L"syncor11.dll", // SynthCore Midi interface. |
| L"systools.dll", // Panda Antivirus. |
| L"tfwah.dll", // Threatfire (PC tools). |
| L"wblind.dll", // Stardock Object desktop. |
| L"wbhelp.dll", // Stardock Object desktop. |
| L"winstylerthemehelper.dll" // Tuneup utilities 2006. |
| }; |
| |
| enum PluginPolicyCategory { |
| PLUGIN_GROUP_TRUSTED, |
| PLUGIN_GROUP_UNTRUSTED, |
| }; |
| |
| // Returns the policy category for the plugin dll. |
| PluginPolicyCategory GetPolicyCategoryForPlugin( |
| const std::wstring& dll, |
| const std::wstring& list) { |
| std::wstring filename = FilePath(dll).BaseName().value(); |
| std::wstring plugin_dll = StringToLowerASCII(filename); |
| std::wstring trusted_plugins = StringToLowerASCII(list); |
| |
| size_t pos = 0; |
| size_t end_item = 0; |
| while (end_item != std::wstring::npos) { |
| end_item = list.find(L",", pos); |
| |
| size_t size_item = (end_item == std::wstring::npos) ? end_item : |
| end_item - pos; |
| std::wstring item = list.substr(pos, size_item); |
| if (!item.empty() && item == plugin_dll) |
| return PLUGIN_GROUP_TRUSTED; |
| |
| pos = end_item + 1; |
| } |
| |
| return PLUGIN_GROUP_UNTRUSTED; |
| } |
| |
| // Adds the policy rules for the path and path\ with the semantic |access|. |
| // If |children| is set to true, we need to add the wildcard rules to also |
| // apply the rule to the subfiles and subfolders. |
| bool AddDirectory(int path, const wchar_t* sub_dir, bool children, |
| sandbox::TargetPolicy::Semantics access, |
| sandbox::TargetPolicy* policy) { |
| std::wstring directory; |
| if (!PathService::Get(path, &directory)) |
| return false; |
| |
| if (sub_dir) { |
| file_util::AppendToPath(&directory, sub_dir); |
| file_util::AbsolutePath(&directory); |
| } |
| |
| sandbox::ResultCode result; |
| result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_FILES, access, |
| directory.c_str()); |
| if (result != sandbox::SBOX_ALL_OK) |
| return false; |
| |
| if (children) |
| file_util::AppendToPath(&directory, L"*"); |
| else |
| // Add the version of the path that ends with a separator. |
| file_util::AppendToPath(&directory, L""); |
| |
| result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_FILES, access, |
| directory.c_str()); |
| if (result != sandbox::SBOX_ALL_OK) |
| return false; |
| |
| return true; |
| } |
| |
| // Adds the policy rules for the path and path\* with the semantic |access|. |
| // We need to add the wildcard rules to also apply the rule to the subkeys. |
| bool AddKeyAndSubkeys(std::wstring key, |
| sandbox::TargetPolicy::Semantics access, |
| sandbox::TargetPolicy* policy) { |
| sandbox::ResultCode result; |
| result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_REGISTRY, access, |
| key.c_str()); |
| if (result != sandbox::SBOX_ALL_OK) |
| return false; |
| |
| key += L"\\*"; |
| result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_REGISTRY, access, |
| key.c_str()); |
| if (result != sandbox::SBOX_ALL_OK) |
| return false; |
| |
| return true; |
| } |
| |
| // Adds policy rules for unloaded the known dlls that cause chrome to crash. |
| // Eviction of injected DLLs is done by the sandbox so that the injected module |
| // does not get a chance to execute any code. |
| void AddDllEvictionPolicy(sandbox::TargetPolicy* policy) { |
| for (int ix = 0; ix != arraysize(kTroublesomeDlls); ++ix) { |
| // To minimize the list we only add an unload policy if the dll is also |
| // loaded in this process. All the injected dlls of interest do this. |
| if (::GetModuleHandleW(kTroublesomeDlls[ix])) { |
| LOG(INFO) << "dll to unload found: " << kTroublesomeDlls[ix]; |
| policy->AddDllToUnload(kTroublesomeDlls[ix]); |
| } |
| } |
| } |
| |
| // Adds the generic policy rules to a sandbox TargetPolicy. |
| bool AddGenericPolicy(sandbox::TargetPolicy* policy) { |
| sandbox::ResultCode result; |
| |
| // Add the policy for the pipes |
| result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_FILES, |
| sandbox::TargetPolicy::FILES_ALLOW_ANY, |
| L"\\??\\pipe\\chrome.*"); |
| if (result != sandbox::SBOX_ALL_OK) |
| return false; |
| |
| // Add the policy for debug message only in debug |
| #ifndef NDEBUG |
| std::wstring debug_message; |
| if (!PathService::Get(chrome::DIR_APP, &debug_message)) |
| return false; |
| if (!win_util::ConvertToLongPath(debug_message, &debug_message)) |
| return false; |
| file_util::AppendToPath(&debug_message, L"debug_message.exe"); |
| result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_PROCESS, |
| sandbox::TargetPolicy::PROCESS_MIN_EXEC, |
| debug_message.c_str()); |
| if (result != sandbox::SBOX_ALL_OK) |
| return false; |
| #endif // NDEBUG |
| |
| return true; |
| } |
| |
| // Creates a sandbox without any restriction. |
| bool ApplyPolicyForTrustedPlugin(sandbox::TargetPolicy* policy) { |
| policy->SetJobLevel(sandbox::JOB_UNPROTECTED, 0); |
| policy->SetTokenLevel(sandbox::USER_UNPROTECTED, sandbox::USER_UNPROTECTED); |
| return true; |
| } |
| |
| // Creates a sandbox with the plugin running in a restricted environment. |
| // Only the "Users" and "Everyone" groups are enabled in the token. The User SID |
| // is disabled. |
| bool ApplyPolicyForUntrustedPlugin(sandbox::TargetPolicy* policy) { |
| policy->SetJobLevel(sandbox::JOB_UNPROTECTED, 0); |
| |
| sandbox::TokenLevel initial_token = sandbox::USER_UNPROTECTED; |
| if (win_util::GetWinVersion() > win_util::WINVERSION_XP) { |
| // On 2003/Vista the initial token has to be restricted if the main token |
| // is restricted. |
| initial_token = sandbox::USER_RESTRICTED_SAME_ACCESS; |
| } |
| policy->SetTokenLevel(initial_token, sandbox::USER_LIMITED); |
| policy->SetDelayedIntegrityLevel(sandbox::INTEGRITY_LEVEL_LOW); |
| |
| if (!AddDirectory(base::DIR_TEMP, NULL, true, |
| sandbox::TargetPolicy::FILES_ALLOW_ANY, policy)) |
| return false; |
| |
| if (!AddDirectory(base::DIR_IE_INTERNET_CACHE, NULL, true, |
| sandbox::TargetPolicy::FILES_ALLOW_ANY, policy)) |
| return false; |
| |
| if (!AddDirectory(base::DIR_APP_DATA, NULL, true, |
| sandbox::TargetPolicy::FILES_ALLOW_READONLY, |
| policy)) |
| return false; |
| |
| if (!AddDirectory(base::DIR_PROFILE, NULL, false, /*not recursive*/ |
| sandbox::TargetPolicy::FILES_ALLOW_READONLY, |
| policy)) |
| return false; |
| |
| if (!AddDirectory(base::DIR_APP_DATA, L"Adobe", true, |
| sandbox::TargetPolicy::FILES_ALLOW_ANY, |
| policy)) |
| return false; |
| |
| if (!AddDirectory(base::DIR_APP_DATA, L"Macromedia", true, |
| sandbox::TargetPolicy::FILES_ALLOW_ANY, |
| policy)) |
| return false; |
| |
| if (!AddDirectory(base::DIR_LOCAL_APP_DATA, NULL, true, |
| sandbox::TargetPolicy::FILES_ALLOW_READONLY, |
| policy)) |
| return false; |
| |
| if (!AddKeyAndSubkeys(L"HKEY_CURRENT_USER\\SOFTWARE\\ADOBE", |
| sandbox::TargetPolicy::REG_ALLOW_ANY, |
| policy)) |
| return false; |
| |
| if (!AddKeyAndSubkeys(L"HKEY_CURRENT_USER\\SOFTWARE\\MACROMEDIA", |
| sandbox::TargetPolicy::REG_ALLOW_ANY, |
| policy)) |
| return false; |
| |
| if (win_util::GetWinVersion() >= win_util::WINVERSION_VISTA) { |
| if (!AddKeyAndSubkeys(L"HKEY_CURRENT_USER\\SOFTWARE\\AppDataLow", |
| sandbox::TargetPolicy::REG_ALLOW_ANY, |
| policy)) |
| return false; |
| |
| if (!AddDirectory(base::DIR_LOCAL_APP_DATA_LOW, NULL, true, |
| sandbox::TargetPolicy::FILES_ALLOW_ANY, |
| policy)) |
| return false; |
| |
| // DIR_APP_DATA is AppData\Roaming, but Adobe needs to do a directory |
| // listing in AppData directly, so we add a non-recursive policy for |
| // AppData itself. |
| if (!AddDirectory(base::DIR_APP_DATA, L"..", false, |
| sandbox::TargetPolicy::FILES_ALLOW_READONLY, |
| policy)) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| // Adds the custom policy rules for a given plugin. |trusted_plugins| contains |
| // the comma separate list of plugin dll names that should not be sandboxed. |
| bool AddPolicyForPlugin(const CommandLine* cmd_line, |
| sandbox::TargetPolicy* policy) { |
| std::wstring plugin_dll = cmd_line-> |
| GetSwitchValue(switches::kPluginPath); |
| std::wstring trusted_plugins = CommandLine::ForCurrentProcess()-> |
| GetSwitchValue(switches::kTrustedPlugins); |
| // Add the policy for the pipes. |
| sandbox::ResultCode result = sandbox::SBOX_ALL_OK; |
| result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_NAMED_PIPES, |
| sandbox::TargetPolicy::NAMEDPIPES_ALLOW_ANY, |
| L"\\\\.\\pipe\\chrome.*"); |
| if (result != sandbox::SBOX_ALL_OK) { |
| NOTREACHED(); |
| return false; |
| } |
| |
| PluginPolicyCategory policy_category = |
| GetPolicyCategoryForPlugin(plugin_dll, trusted_plugins); |
| |
| switch (policy_category) { |
| case PLUGIN_GROUP_TRUSTED: |
| return ApplyPolicyForTrustedPlugin(policy); |
| case PLUGIN_GROUP_UNTRUSTED: |
| return ApplyPolicyForUntrustedPlugin(policy); |
| default: |
| NOTREACHED(); |
| break; |
| } |
| |
| return false; |
| } |
| |
| void AddPolicyForRenderer(sandbox::TargetPolicy* policy, |
| bool* on_sandbox_desktop) { |
| policy->SetJobLevel(sandbox::JOB_LOCKDOWN, 0); |
| |
| sandbox::TokenLevel initial_token = sandbox::USER_UNPROTECTED; |
| if (win_util::GetWinVersion() > win_util::WINVERSION_XP) { |
| // On 2003/Vista the initial token has to be restricted if the main |
| // token is restricted. |
| initial_token = sandbox::USER_RESTRICTED_SAME_ACCESS; |
| } |
| |
| policy->SetTokenLevel(initial_token, sandbox::USER_LOCKDOWN); |
| policy->SetDelayedIntegrityLevel(sandbox::INTEGRITY_LEVEL_LOW); |
| |
| bool use_winsta = !CommandLine::ForCurrentProcess()->HasSwitch( |
| switches::kDisableAltWinstation); |
| |
| if (sandbox::SBOX_ALL_OK == policy->SetAlternateDesktop(use_winsta)) { |
| *on_sandbox_desktop = true; |
| } else { |
| *on_sandbox_desktop = false; |
| DLOG(WARNING) << "Failed to apply desktop security to the renderer"; |
| } |
| |
| AddDllEvictionPolicy(policy); |
| } |
| |
| } // namespace |
| |
| namespace sandbox { |
| |
| base::ProcessHandle StartProcessWithAccess(CommandLine* cmd_line, |
| const FilePath& exposed_dir) { |
| base::ProcessHandle process = 0; |
| const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess(); |
| ChildProcessInfo::ProcessType type; |
| std::string type_str = cmd_line->GetSwitchValueASCII(switches::kProcessType); |
| if (type_str == switches::kRendererProcess) { |
| type = ChildProcessInfo::RENDER_PROCESS; |
| } else if (type_str == switches::kExtensionProcess) { |
| // Extensions are just renderers with another name. |
| type = ChildProcessInfo::RENDER_PROCESS; |
| } else if (type_str == switches::kPluginProcess) { |
| type = ChildProcessInfo::PLUGIN_PROCESS; |
| } else if (type_str == switches::kWorkerProcess) { |
| type = ChildProcessInfo::WORKER_PROCESS; |
| } else if (type_str == switches::kNaClLoaderProcess) { |
| type = ChildProcessInfo::NACL_LOADER_PROCESS; |
| } else if (type_str == switches::kUtilityProcess) { |
| type = ChildProcessInfo::UTILITY_PROCESS; |
| } else if (type_str == switches::kNaClBrokerProcess) { |
| type = ChildProcessInfo::NACL_BROKER_PROCESS; |
| } else if (type_str == switches::kGpuProcess) { |
| type = ChildProcessInfo::GPU_PROCESS; |
| } else { |
| NOTREACHED(); |
| return 0; |
| } |
| |
| bool in_sandbox = |
| !browser_command_line.HasSwitch(switches::kNoSandbox) && |
| (type != ChildProcessInfo::PLUGIN_PROCESS || |
| browser_command_line.HasSwitch(switches::kSafePlugins)); |
| #if !defined (GOOGLE_CHROME_BUILD) |
| if (browser_command_line.HasSwitch(switches::kInProcessPlugins)) { |
| // In process plugins won't work if the sandbox is enabled. |
| in_sandbox = false; |
| } |
| #endif |
| |
| // Propagate the Chrome Frame flag to sandboxed processes if present. |
| if (browser_command_line.HasSwitch(switches::kChromeFrame)) { |
| if (!cmd_line->HasSwitch(switches::kChromeFrame)) { |
| cmd_line->AppendSwitch(switches::kChromeFrame); |
| } |
| } |
| |
| bool child_needs_help = |
| DebugFlags::ProcessDebugFlags(cmd_line, type, in_sandbox); |
| |
| if (!in_sandbox) { |
| base::LaunchApp(*cmd_line, false, false, &process); |
| return process; |
| } |
| |
| #ifdef NACL_WIN64 |
| // When running in the broker we get the BrokerServices pointer from a global |
| // variable. It is initialized in NaClBrokerMain. |
| sandbox::BrokerServices* broker_service = g_broker_services; |
| #else |
| // spawn the child process in the sandbox |
| sandbox::BrokerServices* broker_service = |
| g_browser_process->broker_services(); |
| #endif |
| sandbox::ResultCode result; |
| PROCESS_INFORMATION target = {0}; |
| sandbox::TargetPolicy* policy = broker_service->CreatePolicy(); |
| |
| bool on_sandbox_desktop = false; |
| // TODO(gregoryd): try locked-down policy for sel_ldr after we fix IMC. |
| // TODO(gregoryd): do we need a new desktop for sel_ldr? |
| if (type == ChildProcessInfo::PLUGIN_PROCESS) { |
| if (!AddPolicyForPlugin(cmd_line, policy)) |
| return 0; |
| } else { |
| AddPolicyForRenderer(policy, &on_sandbox_desktop); |
| |
| if (type_str != switches::kRendererProcess) { |
| // Hack for Google Desktop crash. Trick GD into not injecting its DLL into |
| // this subprocess. See |
| // http://code.google.com/p/chromium/issues/detail?id=25580 |
| cmd_line->AppendSwitchWithValue("ignored", " --type=renderer "); |
| } |
| } |
| |
| if (!exposed_dir.empty()) { |
| result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_FILES, |
| sandbox::TargetPolicy::FILES_ALLOW_ANY, |
| exposed_dir.ToWStringHack().c_str()); |
| if (result != sandbox::SBOX_ALL_OK) |
| return 0; |
| |
| FilePath exposed_files = exposed_dir.AppendASCII("*"); |
| result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_FILES, |
| sandbox::TargetPolicy::FILES_ALLOW_ANY, |
| exposed_files.ToWStringHack().c_str()); |
| if (result != sandbox::SBOX_ALL_OK) |
| return 0; |
| } |
| |
| if (!AddGenericPolicy(policy)) { |
| NOTREACHED(); |
| return 0; |
| } |
| |
| result = broker_service->SpawnTarget( |
| cmd_line->program().c_str(), |
| cmd_line->command_line_string().c_str(), |
| policy, &target); |
| policy->Release(); |
| |
| if (sandbox::SBOX_ALL_OK != result) |
| return 0; |
| |
| ResumeThread(target.hThread); |
| CloseHandle(target.hThread); |
| process = target.hProcess; |
| |
| // Help the process a little. It can't start the debugger by itself if |
| // the process is in a sandbox. |
| if (child_needs_help) |
| DebugUtil::SpawnDebuggerOnProcess(target.dwProcessId); |
| |
| return process; |
| } |
| |
| } // namespace sandbox |
