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1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef SANDBOX_LINUX_SERVICES_CREDENTIALS_H_ | 5 #ifndef SANDBOX_LINUX_SERVICES_CREDENTIALS_H_ |
6 #define SANDBOX_LINUX_SERVICES_CREDENTIALS_H_ | 6 #define SANDBOX_LINUX_SERVICES_CREDENTIALS_H_ |
7 | 7 |
| 8 #include <sys/capability.h> |
| 9 |
8 #include "build/build_config.h" | 10 #include "build/build_config.h" |
9 // Link errors are tedious to track, raise a compile-time error instead. | 11 // Link errors are tedious to track, raise a compile-time error instead. |
10 #if defined(OS_ANDROID) | 12 #if defined(OS_ANDROID) |
11 #error "Android is not supported." | 13 #error "Android is not supported." |
12 #endif // defined(OS_ANDROID). | 14 #endif // defined(OS_ANDROID). |
13 | 15 |
14 #include <string> | 16 #include <string> |
| 17 #include <vector> |
15 | 18 |
16 #include "base/basictypes.h" | 19 #include "base/basictypes.h" |
17 #include "base/compiler_specific.h" | 20 #include "base/compiler_specific.h" |
18 #include "base/memory/scoped_ptr.h" | 21 #include "base/memory/scoped_ptr.h" |
19 #include "sandbox/sandbox_export.h" | 22 #include "sandbox/sandbox_export.h" |
20 | 23 |
21 namespace sandbox { | 24 namespace sandbox { |
22 | 25 |
23 // This class should be used to manipulate the current process' credentials. | 26 // This class should be used to manipulate the current process' credentials. |
24 // It is currently a stub used to manipulate POSIX.1e capabilities as | 27 // It is currently a stub used to manipulate POSIX.1e capabilities as |
25 // implemented by the Linux kernel. | 28 // implemented by the Linux kernel. |
26 class SANDBOX_EXPORT Credentials { | 29 class SANDBOX_EXPORT Credentials { |
27 public: | 30 public: |
28 // Drop all capabilities in the effective, inheritable and permitted sets for | 31 // Drop all capabilities in the effective, inheritable and permitted sets for |
29 // the current process. For security reasons, since capabilities are | 32 // the current thread. For security reasons, since capabilities are |
30 // per-thread, the caller is responsible for ensuring it is single-threaded | 33 // per-thread, the caller is responsible for ensuring it is single-threaded |
31 // when calling this API. | 34 // when calling this API. |
32 // |proc_fd| must be a file descriptor to /proc/ and remains owned by | 35 // |proc_fd| must be a file descriptor to /proc/ and remains owned by |
33 // the caller. | 36 // the caller. |
34 static bool DropAllCapabilities(int proc_fd) WARN_UNUSED_RESULT; | 37 static bool DropAllCapabilities(int proc_fd) WARN_UNUSED_RESULT; |
35 // A similar API which assumes that it can open /proc/self/ by itself. | 38 // A similar API which assumes that it can open /proc/self/ by itself. |
36 static bool DropAllCapabilities() WARN_UNUSED_RESULT; | 39 static bool DropAllCapabilities() WARN_UNUSED_RESULT; |
| 40 // Sets the effective and permitted capability sets for the current thread to |
| 41 // the list of capabiltiies in |caps|. All other capability flags are cleared. |
| 42 static bool SetCapabilities(int proc_fd, const std::vector<cap_value_t>& caps) |
| 43 WARN_UNUSED_RESULT; |
| 44 |
| 45 // Returns true if the current thread has either the CAP_EFFECTIVE or |
| 46 // CAP_PERMITTED flag set for the given capability. |
| 47 static bool HasCapability(cap_value_t cap); |
37 | 48 |
38 // Return true iff there is any capability in any of the capabilities sets | 49 // Return true iff there is any capability in any of the capabilities sets |
39 // of the current process. | 50 // of the current thread. |
40 static bool HasAnyCapability(); | 51 static bool HasAnyCapability(); |
41 // Returns the capabilities of the current process in textual form, as | 52 // Returns the capabilities of the current thread in textual form, as |
42 // documented in libcap2's cap_to_text(3). This is mostly useful for | 53 // documented in libcap2's cap_to_text(3). This is mostly useful for |
43 // debugging and tests. | 54 // debugging and tests. |
44 static scoped_ptr<std::string> GetCurrentCapString(); | 55 static scoped_ptr<std::string> GetCurrentCapString(); |
45 | 56 |
46 // Returns whether the kernel supports CLONE_NEWUSER and whether it would be | 57 // Returns whether the kernel supports CLONE_NEWUSER and whether it would be |
47 // possible to immediately move to a new user namespace. There is no point | 58 // possible to immediately move to a new user namespace. There is no point |
48 // in using this method right before calling MoveToNewUserNS(), simply call | 59 // in using this method right before calling MoveToNewUserNS(), simply call |
49 // MoveToNewUserNS() immediately. This method is only useful to test the | 60 // MoveToNewUserNS() immediately. This method is only useful to test the |
50 // ability to move to a user namespace ahead of time. | 61 // ability to move to a user namespace ahead of time. |
51 static bool CanCreateProcessInNewUserNS(); | 62 static bool CanCreateProcessInNewUserNS(); |
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73 // - DropAllCapabilities() must be called to prevent escapes. | 84 // - DropAllCapabilities() must be called to prevent escapes. |
74 static bool DropFileSystemAccess(int proc_fd) WARN_UNUSED_RESULT; | 85 static bool DropFileSystemAccess(int proc_fd) WARN_UNUSED_RESULT; |
75 | 86 |
76 private: | 87 private: |
77 DISALLOW_IMPLICIT_CONSTRUCTORS(Credentials); | 88 DISALLOW_IMPLICIT_CONSTRUCTORS(Credentials); |
78 }; | 89 }; |
79 | 90 |
80 } // namespace sandbox. | 91 } // namespace sandbox. |
81 | 92 |
82 #endif // SANDBOX_LINUX_SERVICES_CREDENTIALS_H_ | 93 #endif // SANDBOX_LINUX_SERVICES_CREDENTIALS_H_ |
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