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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 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_NAMESPACE_SANDBOX_H_ | 5 #ifndef SANDBOX_LINUX_SERVICES_NAMESPACE_SANDBOX_H_ |
6 #define SANDBOX_LINUX_SERVICES_NAMESPACE_SANDBOX_H_ | 6 #define SANDBOX_LINUX_SERVICES_NAMESPACE_SANDBOX_H_ |
7 | 7 |
| 8 #include <sys/types.h> |
| 9 |
8 #include <string> | 10 #include <string> |
9 #include <vector> | 11 #include <vector> |
10 | 12 |
11 #include "base/command_line.h" | 13 #include "base/command_line.h" |
12 #include "base/macros.h" | 14 #include "base/macros.h" |
13 #include "base/process/launch.h" | 15 #include "base/process/launch.h" |
14 #include "base/process/process.h" | 16 #include "base/process/process.h" |
15 #include "sandbox/sandbox_export.h" | 17 #include "sandbox/sandbox_export.h" |
16 | 18 |
17 namespace sandbox { | 19 namespace sandbox { |
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40 // supported (use Credentials::CanCreateProcessInNewUserNS to check this). | 42 // supported (use Credentials::CanCreateProcessInNewUserNS to check this). |
41 // | 43 // |
42 // pre_exec_delegate and clone_flags fields of LaunchOptions should be nullptr | 44 // pre_exec_delegate and clone_flags fields of LaunchOptions should be nullptr |
43 // and 0, respectively, since this function makes a copy of options and | 45 // and 0, respectively, since this function makes a copy of options and |
44 // overrides them. | 46 // overrides them. |
45 static base::Process LaunchProcess(const base::CommandLine& cmdline, | 47 static base::Process LaunchProcess(const base::CommandLine& cmdline, |
46 const base::LaunchOptions& options); | 48 const base::LaunchOptions& options); |
47 static base::Process LaunchProcess(const std::vector<std::string>& argv, | 49 static base::Process LaunchProcess(const std::vector<std::string>& argv, |
48 const base::LaunchOptions& options); | 50 const base::LaunchOptions& options); |
49 | 51 |
| 52 // Forks a process in its own PID namespace. The child process is the init |
| 53 // process inside of the PID namespace, so if the child needs to fork further, |
| 54 // it should call CreateInitProcessReaper, which turns the init process into a |
| 55 // reaper process. |
| 56 // |
| 57 // If the child does not call CreateInitProcessReaper, then there are some |
| 58 // special considerations to be made for the fact that it is an init process |
| 59 // in a PID namespace. |
| 60 // |
| 61 // Aside from SIGKILL and SIGSTOP, the init process in a PID namespace ignores |
| 62 // signals for which it does not have an explicit signal handler. The child |
| 63 // may call InstallTerminationSignalHandler to setup handlers for these |
| 64 // signals that exit with a specific exit code. For most purposes, handlers |
| 65 // should be installed for at least these signals: |
| 66 // |
| 67 // SIGHUP, SIGINT, SIGABRT, SIGQUIT, SIGPIPE, SIGTERM, SIGUSR1, SIGUSR2 |
| 68 // |
| 69 // This function requries CAP_SYS_ADMIN. If |drop_capabilities_in_child| is |
| 70 // true, then capabilities are dropped in the child. |
| 71 static pid_t ForkInNewPidNamespace(bool drop_capabilities_in_child); |
| 72 |
| 73 // Installs a signal handler for |sig| which exits with |exit_code|. |
| 74 static void InstallTerminationSignalHandler(int sig, int exit_code); |
| 75 |
50 // Returns whether the namespace sandbox created a new user, PID, and network | 76 // Returns whether the namespace sandbox created a new user, PID, and network |
51 // namespace. In particular, InNewUserNamespace should return true iff the | 77 // namespace. In particular, InNewUserNamespace should return true iff the |
52 // process was started via this class. | 78 // process was started via this class. |
53 static bool InNewUserNamespace(); | 79 static bool InNewUserNamespace(); |
54 static bool InNewPidNamespace(); | 80 static bool InNewPidNamespace(); |
55 static bool InNewNetNamespace(); | 81 static bool InNewNetNamespace(); |
56 | 82 |
57 private: | 83 private: |
58 DISALLOW_IMPLICIT_CONSTRUCTORS(NamespaceSandbox); | 84 DISALLOW_IMPLICIT_CONSTRUCTORS(NamespaceSandbox); |
59 }; | 85 }; |
60 | 86 |
61 } // namespace sandbox | 87 } // namespace sandbox |
62 | 88 |
63 #endif // SANDBOX_LINUX_SERVICES_NAMESPACE_SANDBOX_H_ | 89 #endif // SANDBOX_LINUX_SERVICES_NAMESPACE_SANDBOX_H_ |
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