sandboxed-api/oss-internship-2020/libtiff/sandboxed.h

// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef LIBTIFF_SANDBOXED_H_
#define LIBTIFF_SANDBOXED_H_

#include <linux/futex.h>
#include <syscall.h>

#include <utility>

#include "sandboxed_api/util/flag.h"
#include "tiff_sapi.sapi.h"  // NOLINT(build/include)

ABSL_DECLARE_FLAG(string, sandbox2_danger_danger_permit_all);
ABSL_DECLARE_FLAG(string, sandbox2_danger_danger_permit_all_and_log);

class TiffSapiSandbox : public TiffSandbox {
 public:
  explicit TiffSapiSandbox(std::string dir = "", std::string file = "")
      : dir_(std::move(dir)), file_(std::move(file)) {}

 private:
  std::unique_ptr<sandbox2::Policy> ModifyPolicy(
      sandbox2::PolicyBuilder*) override {
    auto builder = sandbox2::PolicyBuilder()
                       .AllowRead()
                       .AllowStaticStartup()
                       .AllowWrite()
                       .AllowOpen()
                       .AllowExit()
                       .AllowStat()
                       .AllowSystemMalloc()
                       .AllowSyscalls({
                           __NR_futex,
                           __NR_close,
                           __NR_lseek,
                           __NR_gettid,
                           __NR_sysinfo,
                           __NR_mmap,
                           __NR_munmap,
                       });

    if (!dir_.empty()) {
      builder.AddDirectory(dir_, /*is_ro=*/false);
    }

    if (!file_.empty()) {
      builder.AddFile(file_, /*is_ro=*/false);
    }

    return builder.BuildOrDie();
  }

  std::string dir_;
  std::string file_;
};

#endif  // LIBTIFF_SANDBOXED_H_