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1 // Copyright 2013 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_elf/blacklist/blacklist.h" | |
6 | |
7 #include <string.h> | |
8 | |
9 #include "base/basictypes.h" | |
10 #include "chrome_elf/blacklist/blacklist_interceptions.h" | |
11 #include "sandbox/win/src/interception_internal.h" | |
12 #include "sandbox/win/src/internal_types.h" | |
13 #include "sandbox/win/src/sandbox_utils.h" | |
14 #include "sandbox/win/src/service_resolver.h" | |
15 | |
16 // http://blogs.msdn.com/oldnewthing/archive/2004/10/25/247180.aspx | |
17 extern "C" IMAGE_DOS_HEADER __ImageBase; | |
18 | |
19 namespace blacklist{ | |
20 | |
21 const wchar_t* g_troublesome_dlls[kTroublesomeDllsMaxCount] = {}; | |
22 int g_troublesome_dlls_cur_index = 0; | |
23 | |
24 const wchar_t kRegistryBeaconPath[] = L"SOFTWARE\\Google\\Chrome\\BLBeacon"; | |
25 | |
26 } // namespace blacklist | |
27 | |
28 // Allocate storage for thunks in a RWX page of this module to save on doing | |
29 // an extra allocation at run time. | |
30 #if !defined(_WIN64) | |
31 // 64-bit images appear to not support writeable and executable pages. | |
32 // This would yield compile warning C4330. | |
33 // TODO(robertshield): Add 64 bit support. | |
34 #pragma section(".crthunk",read,write,execute) | |
35 __declspec(allocate(".crthunk")) sandbox::ThunkData g_thunk_storage; | |
36 #endif | |
37 | |
38 namespace { | |
39 | |
40 enum Version { | |
41 VERSION_PRE_XP_SP2 = 0, // Not supported. | |
42 VERSION_XP_SP2, | |
43 VERSION_SERVER_2003, // Also includes XP Pro x64 and Server 2003 R2. | |
44 VERSION_VISTA, // Also includes Windows Server 2008. | |
45 VERSION_WIN7, // Also includes Windows Server 2008 R2. | |
46 VERSION_WIN8, // Also includes Windows Server 2012. | |
47 VERSION_WIN8_1, | |
48 VERSION_WIN_LAST, // Indicates error condition. | |
49 }; | |
50 | |
51 // Whether a process is running under WOW64 (the wrapper that allows 32-bit | |
52 // processes to run on 64-bit versions of Windows). This will return | |
53 // WOW64_DISABLED for both "32-bit Chrome on 32-bit Windows" and "64-bit | |
54 // Chrome on 64-bit Windows". WOW64_UNKNOWN means "an error occurred", e.g. | |
55 // the process does not have sufficient access rights to determine this. | |
56 enum WOW64Status { | |
57 WOW64_DISABLED, | |
58 WOW64_ENABLED, | |
59 WOW64_UNKNOWN, | |
60 }; | |
61 | |
62 WOW64Status GetWOW64StatusForCurrentProcess() { | |
63 typedef BOOL (WINAPI* IsWow64ProcessFunc)(HANDLE, PBOOL); | |
64 IsWow64ProcessFunc is_wow64_process = reinterpret_cast<IsWow64ProcessFunc>( | |
65 GetProcAddress(GetModuleHandle(L"kernel32.dll"), "IsWow64Process")); | |
66 if (!is_wow64_process) | |
67 return WOW64_DISABLED; | |
68 BOOL is_wow64 = FALSE; | |
69 if (!(*is_wow64_process)(GetCurrentProcess(), &is_wow64)) | |
70 return WOW64_UNKNOWN; | |
71 return is_wow64 ? WOW64_ENABLED : WOW64_DISABLED; | |
72 } | |
73 | |
74 class OSInfo { | |
75 public: | |
76 struct VersionNumber { | |
77 int major; | |
78 int minor; | |
79 int build; | |
80 }; | |
81 | |
82 struct ServicePack { | |
83 int major; | |
84 int minor; | |
85 }; | |
86 | |
87 OSInfo() { | |
88 OSVERSIONINFOEX version_info = { sizeof(version_info) }; | |
89 GetVersionEx(reinterpret_cast<OSVERSIONINFO*>(&version_info)); | |
90 version_number_.major = version_info.dwMajorVersion; | |
91 version_number_.minor = version_info.dwMinorVersion; | |
92 version_number_.build = version_info.dwBuildNumber; | |
93 if ((version_number_.major == 5) && (version_number_.minor > 0)) { | |
94 // Treat XP Pro x64, Home Server, and Server 2003 R2 as Server 2003. | |
95 version_ = (version_number_.minor == 1) ? VERSION_XP_SP2 : | |
96 VERSION_SERVER_2003; | |
97 if (version_ == VERSION_XP_SP2 && version_info.wServicePackMajor < 2) | |
98 version_ = VERSION_PRE_XP_SP2; | |
99 } else if (version_number_.major == 6) { | |
100 switch (version_number_.minor) { | |
101 case 0: | |
102 // Treat Windows Server 2008 the same as Windows Vista. | |
103 version_ = VERSION_VISTA; | |
104 break; | |
105 case 1: | |
106 // Treat Windows Server 2008 R2 the same as Windows 7. | |
107 version_ = VERSION_WIN7; | |
108 break; | |
109 case 2: | |
110 // Treat Windows Server 2012 the same as Windows 8. | |
111 version_ = VERSION_WIN8; | |
112 break; | |
113 default: | |
114 version_ = VERSION_WIN8_1; | |
115 break; | |
116 } | |
117 } else if (version_number_.major > 6) { | |
118 version_ = VERSION_WIN_LAST; | |
119 } else { | |
120 version_ = VERSION_PRE_XP_SP2; | |
121 } | |
122 | |
123 service_pack_.major = version_info.wServicePackMajor; | |
124 service_pack_.minor = version_info.wServicePackMinor; | |
125 } | |
126 | |
127 Version version() const { return version_; } | |
128 VersionNumber version_number() const { return version_number_; } | |
129 ServicePack service_pack() const { return service_pack_; } | |
130 | |
131 private: | |
132 Version version_; | |
133 VersionNumber version_number_; | |
134 ServicePack service_pack_; | |
135 | |
136 DISALLOW_COPY_AND_ASSIGN(OSInfo); | |
137 }; | |
138 | |
139 bool IsNonBrowserProcess() { | |
140 wchar_t* command_line = GetCommandLine(); | |
141 return (command_line && wcsstr(command_line, L"--type")); | |
142 } | |
143 | |
144 } // namespace | |
145 | |
146 namespace blacklist { | |
147 | |
148 bool CreateBeacon() { | |
149 HKEY beacon_key = NULL; | |
150 DWORD disposition = 0; | |
151 LONG result = ::RegCreateKeyEx(HKEY_CURRENT_USER, | |
152 kRegistryBeaconPath, | |
153 0, | |
154 NULL, | |
155 0, | |
156 KEY_WRITE, | |
157 NULL, | |
158 &beacon_key, | |
159 &disposition); | |
160 bool success = (result == ERROR_SUCCESS && | |
161 disposition != REG_OPENED_EXISTING_KEY); | |
162 if (result == ERROR_SUCCESS) | |
163 ::RegCloseKey(beacon_key); | |
164 return success; | |
165 } | |
166 | |
167 bool ClearBeacon() { | |
168 LONG result = ::RegDeleteKey(HKEY_CURRENT_USER, kRegistryBeaconPath); | |
169 return (result == ERROR_SUCCESS); | |
170 } | |
171 | |
172 bool AddDllToBlacklist(const wchar_t* dll_name) { | |
173 if (g_troublesome_dlls_cur_index >= kTroublesomeDllsMaxCount) | |
174 return false; | |
175 for (int i = 0; i < g_troublesome_dlls_cur_index; ++i) { | |
176 if (!wcscmp(g_troublesome_dlls[i], dll_name)) | |
177 return true; | |
178 } | |
179 | |
180 // Copy string to blacklist. | |
181 wchar_t* str_buffer = new wchar_t[wcslen(dll_name) + 1]; | |
182 wcscpy(str_buffer, dll_name); | |
183 | |
184 g_troublesome_dlls[g_troublesome_dlls_cur_index] = str_buffer; | |
185 g_troublesome_dlls_cur_index++; | |
186 return true; | |
187 } | |
188 | |
189 bool RemoveDllFromBlacklist(const wchar_t* dll_name) { | |
190 for (int i = 0; i < g_troublesome_dlls_cur_index; ++i) { | |
191 if (!wcscmp(g_troublesome_dlls[i], dll_name)) { | |
192 // Found the thing to remove. Delete it then replace it with the last | |
193 // element. | |
194 g_troublesome_dlls_cur_index--; | |
195 delete[] g_troublesome_dlls[i]; | |
196 g_troublesome_dlls[i] = g_troublesome_dlls[g_troublesome_dlls_cur_index]; | |
197 g_troublesome_dlls[g_troublesome_dlls_cur_index] = NULL; | |
198 return true; | |
199 } | |
200 } | |
201 return false; | |
202 } | |
203 | |
204 bool Initialize(bool force) { | |
205 #if defined(_WIN64) | |
206 // TODO(robertshield): Implement 64-bit support by providing 64-bit | |
207 // interceptors. | |
208 return false; | |
209 #endif | |
210 | |
211 // Check to see that we found the functions we need in ntdll. | |
212 if (!InitializeInterceptImports()) | |
213 return false; | |
214 | |
215 // Check to see if this is a non-browser process, abort if so. | |
216 if (IsNonBrowserProcess()) | |
217 return false; | |
218 | |
219 // Check to see if a beacon is present, abort if so. | |
220 if (!force && !CreateBeacon()) | |
221 return false; | |
222 | |
223 // Don't try blacklisting on unsupported OS versions. | |
224 OSInfo os_info; | |
225 if (os_info.version() <= VERSION_PRE_XP_SP2) | |
226 return false; | |
227 | |
228 // Pseudo-handle, no need to close. | |
229 HANDLE current_process = ::GetCurrentProcess(); | |
230 | |
231 // Tells the resolver to patch already patched functions. | |
232 const bool kRelaxed = true; | |
233 | |
234 // Create a thunk via the appropriate ServiceResolver instance. | |
235 sandbox::ServiceResolverThunk* thunk; | |
236 #if defined(_WIN64) | |
237 // TODO(robertshield): Use the appropriate thunk for 64-bit support | |
238 // when said support is implemented. | |
239 #else | |
240 if (GetWOW64StatusForCurrentProcess() == WOW64_ENABLED) { | |
241 if (os_info.version() >= VERSION_WIN8) | |
242 thunk = new sandbox::Wow64W8ResolverThunk(current_process, kRelaxed); | |
243 else | |
244 thunk = new sandbox::Wow64ResolverThunk(current_process, kRelaxed); | |
245 } else if (os_info.version() >= VERSION_WIN8) { | |
246 thunk = new sandbox::Win8ResolverThunk(current_process, kRelaxed); | |
247 } else { | |
248 thunk = new sandbox::ServiceResolverThunk(current_process, kRelaxed); | |
249 } | |
250 #endif | |
251 | |
252 #if defined(_WIN64) | |
253 BYTE* thunk_storage = new BYTE[sizeof(sandbox::ThunkData)]; | |
254 #else | |
255 BYTE* thunk_storage = reinterpret_cast<BYTE*>(&g_thunk_storage); | |
256 #endif | |
257 | |
258 thunk->AllowLocalPatches(); | |
259 | |
260 // Get ntdll base, target name, interceptor address, | |
261 NTSTATUS ret = thunk->Setup(::GetModuleHandle(sandbox::kNtdllName), | |
262 reinterpret_cast<void*>(&__ImageBase), | |
263 "NtMapViewOfSection", | |
264 NULL, | |
265 &blacklist::BlNtMapViewOfSection, | |
266 thunk_storage, | |
267 sizeof(sandbox::ThunkData), | |
268 NULL); | |
269 | |
270 delete thunk; | |
271 return NT_SUCCESS(ret); | |
272 } | |
273 | |
274 } // namespace blacklist | |
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