content/common/sandbox_linux/sandbox_bpf_base_policy_linux.h

   1 // Copyright 2013 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 #ifndef CONTENT_COMMON_SANDBOX_LINUX_SANDBOX_BPF_BASE_POLICY_LINUX_H_
   6 #define CONTENT_COMMON_SANDBOX_LINUX_SANDBOX_BPF_BASE_POLICY_LINUX_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "sandbox/linux/seccomp-bpf-helpers/baseline_policy.h"
  11 #include "sandbox/linux/seccomp-bpf/sandbox_bpf_policy.h"
  12
  13 using sandbox::ErrorCode;
  14 using sandbox::SandboxBPF;
  15
  16 namespace content {
  17
  18 // The "baseline" BPF policy for content/. Any content/ seccomp-bpf policy
  19 // should inherit from it.
  20 // It implements the main SandboxBPFPolicy interface. Due to its nature
  21 // as a "kernel attack surface reduction" layer, it's implementation-defined.
  22 class SandboxBPFBasePolicy : public sandbox::SandboxBPFPolicy {
  23  public:
  24   SandboxBPFBasePolicy();
  25   virtual ~SandboxBPFBasePolicy();
  26
  27   virtual ErrorCode EvaluateSyscall(SandboxBPF* sandbox_compiler,
  28                                     int system_call_number) const OVERRIDE;
  29
  30   // A policy can implement this hook to run code right before the policy
  31   // is passed to the SandboxBPF class and the sandbox is engaged.
  32   // If PreSandboxHook() returns true, the sandbox is guaranteed to be
  33   // engaged afterwards.
  34   // This will be used when enabling the sandbox though
  35   // SandboxSeccompBPF::StartSandbox().
  36   virtual bool PreSandboxHook();
  37
  38   // Get the errno(3) to return for filesystem errors.
  39   static int GetFSDeniedErrno();
  40
  41  private:
  42   // Compose the BaselinePolicy from sandbox/.
  43   scoped_ptr<sandbox::BaselinePolicy> baseline_policy_;
  44   DISALLOW_COPY_AND_ASSIGN(SandboxBPFBasePolicy);
  45 };
  46
  47 }  // namespace content
  48
  49 #endif  // CONTENT_COMMON_SANDBOX_LINUX_SANDBOX_BPF_BASE_POLICY_LINUX_H_