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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef SANDBOX_MAC_SEATBELT_EXEC_H_
#define SANDBOX_MAC_SEATBELT_EXEC_H_
#include <string>
#include "base/compiler_specific.h"
#include "base/files/scoped_file.h"
#include "base/strings/string_piece.h"
#include "sandbox/mac/seatbelt.pb.h"
#include "sandbox/mac/seatbelt_export.h"
namespace sandbox {
// SeatbeltExecClient is used by the process that is launching another sandboxed
// process. The API allows the launcher process to supply a sandbox profile and
// parameters, which will be communicated to the sandboxed process over IPC.
class SEATBELT_EXPORT SeatbeltExecClient {
public:
SeatbeltExecClient();
~SeatbeltExecClient();
// The Set*Parameter functions return true if the parameter was successfully
// inserted. Check the return value, which indicates if the parameter was
// added successfully.
// Set a boolean parameter in the sandbox profile.
bool SetBooleanParameter(const base::StringPiece key,
bool value) WARN_UNUSED_RESULT;
// Set a string parameter in the sandbox profile.
bool SetParameter(const base::StringPiece key,
const base::StringPiece value) WARN_UNUSED_RESULT;
// Set the actual sandbox profile, using the scheme-like SBPL.
void SetProfile(const base::StringPiece policy);
// Sends the policy to the SeatbeltExecServer and returns the communication
// FD. The FD should be mapped into the sandboxed child process.
int SendProfileAndGetFD();
// Returns the underlying protobuf for testing purposes.
const mac::SandboxPolicy& GetPolicyForTesting() { return policy_; }
private:
// This writes a string (the serialized protobuf) to the |pipe_|.
bool WriteString(std::string* str);
// This is the protobuf which contains the sandbox profile and parameters,
// and is serialized and sent to the other process.
mac::SandboxPolicy policy_;
// A file descriptor pair used for interprocess communication.
int pipe_[2];
};
// SeatbeltExecServer is used by the process that will be sandboxed to receive
// the profile and parameters from the launcher process. It can then initialize
// the profile, sandboxing the process.
class SEATBELT_EXPORT SeatbeltExecServer {
public:
// |sandbox_fd| should be the result of SendProfileAndGetFD().
explicit SeatbeltExecServer(int sandbox_fd);
~SeatbeltExecServer();
// Reads the policy from the client, applies the profile, and returns whether
// or not the operation succeeds.
bool InitializeSandbox();
// Applies the given sandbox policy, and returns whether or not the operation
// succeeds.
bool ApplySandboxProfile(const mac::SandboxPolicy& sandbox_policy);
private:
// Reads from the |fd_| and stores the data into a string. This does
// not append a NUL terminator as protobuf does not expect one.
bool ReadString(std::string* string);
// The file descriptor used to communicate with the launcher process.
base::ScopedFD fd_;
};
} // namespace sandbox
#endif // SANDBOX_MAC_SEATBELT_EXEC_H_
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