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comparison: security/sandbox/win/src/interception_agent.h
security/sandbox/win/src/interception_agent.h
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| 1 // Copyright (c) 2006-2008 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 // Defines InterceptionAgent, the class in charge of setting up interceptions | |
| 6 // from the inside of the sandboxed process. For more details see | |
| 7 // http://dev.chromium.org/developers/design-documents/sandbox . | |
| 8 | |
| 9 #ifndef SANDBOX_SRC_INTERCEPTION_AGENT_H__ | |
| 10 #define SANDBOX_SRC_INTERCEPTION_AGENT_H__ | |
| 11 | |
| 12 #include "base/basictypes.h" | |
| 13 #include "sandbox/win/src/nt_internals.h" | |
| 14 #include "sandbox/win/src/sandbox_types.h" | |
| 15 | |
| 16 namespace sandbox { | |
| 17 | |
| 18 // Internal structures used for communication between the broker and the target. | |
| 19 struct DllInterceptionData; | |
| 20 struct SharedMemory; | |
| 21 struct DllPatchInfo; | |
| 22 | |
| 23 class ResolverThunk; | |
| 24 | |
| 25 // The InterceptionAgent executes on the target application, and it is in charge | |
| 26 // of setting up the desired interceptions or indicating what module needs to | |
| 27 // be unloaded. | |
| 28 // | |
| 29 // The exposed API consists of three methods: GetInterceptionAgent to retrieve | |
| 30 // the single class instance, OnDllLoad and OnDllUnload to process a dll being | |
| 31 // loaded and unloaded respectively. | |
| 32 // | |
| 33 // This class assumes that it will get called for every dll being loaded, | |
| 34 // starting with kernel32, so the singleton will be instantiated from within the | |
| 35 // loader lock. | |
| 36 class InterceptionAgent { | |
| 37 public: | |
| 38 // Returns the single InterceptionAgent object for this process. | |
| 39 static InterceptionAgent* GetInterceptionAgent(); | |
| 40 | |
| 41 // This method should be invoked whenever a new dll is loaded to perform the | |
| 42 // required patches. If the return value is false, this dll should not be | |
| 43 // allowed to load. | |
| 44 // | |
| 45 // full_path is the (optional) full name of the module being loaded and name | |
| 46 // is the internal module name. If full_path is provided, it will be used | |
| 47 // before the internal name to determine if we care about this dll. | |
| 48 bool OnDllLoad(const UNICODE_STRING* full_path, const UNICODE_STRING* name, | |
| 49 void* base_address); | |
| 50 | |
| 51 // Performs cleanup when a dll is unloaded. | |
| 52 void OnDllUnload(void* base_address); | |
| 53 | |
| 54 private: | |
| 55 ~InterceptionAgent() {} | |
| 56 | |
| 57 // Performs initialization of the singleton. | |
| 58 bool Init(SharedMemory* shared_memory); | |
| 59 | |
| 60 // Returns true if we are interested on this dll. dll_info is an entry of the | |
| 61 // list of intercepted dlls. | |
| 62 bool DllMatch(const UNICODE_STRING* full_path, const UNICODE_STRING* name, | |
| 63 const DllPatchInfo* dll_info); | |
| 64 | |
| 65 // Performs the patching of the dll loaded at base_address. | |
| 66 // The patches to perform are described on dll_info, and thunks is the thunk | |
| 67 // storage for the whole dll. | |
| 68 // Returns true on success. | |
| 69 bool PatchDll(const DllPatchInfo* dll_info, DllInterceptionData* thunks); | |
| 70 | |
| 71 // Returns a resolver for a given interception type. | |
| 72 ResolverThunk* GetResolver(InterceptionType type); | |
| 73 | |
| 74 // Shared memory containing the list of functions to intercept. | |
| 75 SharedMemory* interceptions_; | |
| 76 | |
| 77 // Array of thunk data buffers for the intercepted dlls. This object singleton | |
| 78 // is allocated with a placement new with enough space to hold the complete | |
| 79 // array of pointers, not just the first element. | |
| 80 DllInterceptionData* dlls_[1]; | |
| 81 | |
| 82 DISALLOW_IMPLICIT_CONSTRUCTORS(InterceptionAgent); | |
| 83 }; | |
| 84 | |
| 85 } // namespace sandbox | |
| 86 | |
| 87 #endif // SANDBOX_SRC_INTERCEPTION_AGENT_H__ |
