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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 #include "sandbox/win/src/policy_target.h" | |
6 | |
7 #include <stddef.h> | |
8 | |
9 #include "sandbox/win/src/crosscall_client.h" | |
10 #include "sandbox/win/src/ipc_tags.h" | |
11 #include "sandbox/win/src/policy_engine_processor.h" | |
12 #include "sandbox/win/src/policy_low_level.h" | |
13 #include "sandbox/win/src/policy_params.h" | |
14 #include "sandbox/win/src/sandbox_factory.h" | |
15 #include "sandbox/win/src/sandbox_nt_util.h" | |
16 #include "sandbox/win/src/sharedmem_ipc_client.h" | |
17 #include "sandbox/win/src/target_services.h" | |
18 | |
19 namespace sandbox { | |
20 | |
21 // Handle for our private heap. | |
22 extern void* g_heap; | |
23 | |
24 // This is the list of all imported symbols from ntdll.dll. | |
25 SANDBOX_INTERCEPT NtExports g_nt; | |
26 | |
27 // Policy data. | |
28 extern void* volatile g_shared_policy_memory; | |
29 SANDBOX_INTERCEPT size_t g_shared_policy_size; | |
30 | |
31 bool QueryBroker(int ipc_id, CountedParameterSetBase* params) { | |
32 DCHECK_NT(static_cast<size_t>(ipc_id) < kMaxServiceCount); | |
33 DCHECK_NT(g_shared_policy_memory); | |
34 DCHECK_NT(g_shared_policy_size > 0); | |
35 | |
36 if (static_cast<size_t>(ipc_id) >= kMaxServiceCount) | |
37 return false; | |
38 | |
39 PolicyGlobal* global_policy = | |
40 reinterpret_cast<PolicyGlobal*>(g_shared_policy_memory); | |
41 | |
42 if (!global_policy->entry[ipc_id]) | |
43 return false; | |
44 | |
45 PolicyBuffer* policy = reinterpret_cast<PolicyBuffer*>( | |
46 reinterpret_cast<char*>(g_shared_policy_memory) + | |
47 reinterpret_cast<size_t>(global_policy->entry[ipc_id])); | |
48 | |
49 if ((reinterpret_cast<size_t>(global_policy->entry[ipc_id]) > | |
50 global_policy->data_size) || | |
51 (g_shared_policy_size < global_policy->data_size)) { | |
52 NOTREACHED_NT(); | |
53 return false; | |
54 } | |
55 | |
56 for (int i = 0; i < params->count; i++) { | |
57 if (!params->parameters[i].IsValid()) { | |
58 NOTREACHED_NT(); | |
59 return false; | |
60 } | |
61 } | |
62 | |
63 PolicyProcessor processor(policy); | |
64 PolicyResult result = processor.Evaluate(kShortEval, params->parameters, | |
65 params->count); | |
66 DCHECK_NT(POLICY_ERROR != result); | |
67 | |
68 return POLICY_MATCH == result && ASK_BROKER == processor.GetAction(); | |
69 } | |
70 | |
71 // ----------------------------------------------------------------------- | |
72 | |
73 // Hooks NtSetInformationThread to block RevertToSelf from being | |
74 // called before the actual call to LowerToken. | |
75 NTSTATUS WINAPI TargetNtSetInformationThread( | |
76 NtSetInformationThreadFunction orig_SetInformationThread, HANDLE thread, | |
77 NT_THREAD_INFORMATION_CLASS thread_info_class, PVOID thread_information, | |
78 ULONG thread_information_bytes) { | |
79 do { | |
80 if (SandboxFactory::GetTargetServices()->GetState()->RevertedToSelf()) | |
81 break; | |
82 if (ThreadImpersonationToken != thread_info_class) | |
83 break; | |
84 // This is a revert to self. | |
85 return STATUS_SUCCESS; | |
86 } while (false); | |
87 | |
88 return orig_SetInformationThread(thread, thread_info_class, | |
89 thread_information, | |
90 thread_information_bytes); | |
91 } | |
92 | |
93 // Hooks NtOpenThreadToken to force the open_as_self parameter to be set to | |
94 // FALSE if we are still running with the impersonation token. open_as_self set | |
95 // to TRUE means that the token will be open using the process token instead of | |
96 // the impersonation token. This is bad because the process token does not have | |
97 // access to open the thread token. | |
98 NTSTATUS WINAPI TargetNtOpenThreadToken( | |
99 NtOpenThreadTokenFunction orig_OpenThreadToken, HANDLE thread, | |
100 ACCESS_MASK desired_access, BOOLEAN open_as_self, PHANDLE token) { | |
101 if (!SandboxFactory::GetTargetServices()->GetState()->RevertedToSelf()) | |
102 open_as_self = FALSE; | |
103 | |
104 return orig_OpenThreadToken(thread, desired_access, open_as_self, token); | |
105 } | |
106 | |
107 // See comment for TargetNtOpenThreadToken | |
108 NTSTATUS WINAPI TargetNtOpenThreadTokenEx( | |
109 NtOpenThreadTokenExFunction orig_OpenThreadTokenEx, HANDLE thread, | |
110 ACCESS_MASK desired_access, BOOLEAN open_as_self, ULONG handle_attributes, | |
111 PHANDLE token) { | |
112 if (!SandboxFactory::GetTargetServices()->GetState()->RevertedToSelf()) | |
113 open_as_self = FALSE; | |
114 | |
115 return orig_OpenThreadTokenEx(thread, desired_access, open_as_self, | |
116 handle_attributes, token); | |
117 } | |
118 | |
119 } // namespace sandbox | |
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