1 // Copyright (C) 2016 The Android Open Source Project
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 //      http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #ifndef _INIT_CAPABILITIES_H
16 #define _INIT_CAPABILITIES_H
17 
18 #include <sys/capability.h>
19 
20 #include <bitset>
21 #include <string>
22 #include <type_traits>
23 
24 #if !defined(__ANDROID__)
25 #ifndef CAP_BLOCK_SUSPEND
26 #define CAP_BLOCK_SUSPEND 36
27 #endif
28 #ifndef CAP_AUDIT_READ
29 #define CAP_AUDIT_READ 37
30 #endif
31 #undef CAP_LAST_CAP
32 #define CAP_LAST_CAP CAP_AUDIT_READ
33 #endif
34 
35 namespace android {
36 namespace init {
37 
38 struct CapDeleter {
39     void operator()(cap_t caps) const { cap_free(caps); }
40 };
41 
42 using CapSet = std::bitset<CAP_LAST_CAP + 1>;
43 using ScopedCaps = std::unique_ptr<std::remove_pointer<cap_t>::type, CapDeleter>;
44 
45 int LookupCap(const std::string& cap_name);
46 bool CapAmbientSupported();
47 unsigned int GetLastValidCap();
48 bool SetCapsForExec(const CapSet& to_keep);
49 bool DropInheritableCaps();
50 
51 }  // namespace init
52 }  // namespace android
53 
54 #endif  // _INIT_CAPABILITIES_H
55