diff options
Diffstat (limited to 'chrome/common/sandbox_policy.cc')
-rw-r--r-- | chrome/common/sandbox_policy.cc | 503 |
1 files changed, 503 insertions, 0 deletions
diff --git a/chrome/common/sandbox_policy.cc b/chrome/common/sandbox_policy.cc new file mode 100644 index 0000000..aa5249f --- /dev/null +++ b/chrome/common/sandbox_policy.cc @@ -0,0 +1,503 @@ +// Copyright (c) 2010 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 <string> + +#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/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" + +static sandbox::BrokerServices* g_broker_services = NULL; + +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; + + result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_NAMED_PIPES, + sandbox::TargetPolicy::NAMEDPIPES_ALLOW_ANY, + L"\\\\.\\pipe\\chrome.nacl.*"); + 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 { + +void InitBrokerServices(sandbox::BrokerServices* broker_services) { + // TODO(abarth): DCHECK(CalledOnValidThread()); + // See <http://b/1287166>. + CHECK(broker_services); + CHECK(!g_broker_services); + broker_services->Init(); + g_broker_services = broker_services; +} + +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 = + (type != ChildProcessInfo::NACL_BROKER_PROCESS) && + !browser_command_line.HasSwitch(switches::kNoSandbox) && + (type != ChildProcessInfo::PLUGIN_PROCESS || + browser_command_line.HasSwitch(switches::kSafePlugins)) && + (type != ChildProcessInfo::GPU_PROCESS); +#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 + if (browser_command_line.HasSwitch(switches::kEnableExperimentalWebGL) && + browser_command_line.HasSwitch(switches::kInProcessWebGL)) { + // In process WebGL won't work if the sandbox is enabled. + in_sandbox = false; + } + + // 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); + + // Prefetch hints on windows: + // Using a different prefetch profile per process type will allow Windows + // to create separate pretetch settings for browser, renderer etc. + cmd_line->AppendLooseValue(StringPrintf(L"/prefetch:%d", type)); + + if (!in_sandbox) { + base::LaunchApp(*cmd_line, false, false, &process); + return process; + } + + sandbox::ResultCode result; + PROCESS_INFORMATION target = {0}; + sandbox::TargetPolicy* policy = g_broker_services->CreatePolicy(); + + bool on_sandbox_desktop = false; + 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 = g_broker_services->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 |