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

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// 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.
#include <linux/futex.h>
#include <syscall.h>
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#include <optional>
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#include <utility>
#include "tiff_sapi.sapi.h" // NOLINT(build/include)
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namespace {
class TiffSapiSandbox : public TiffSandbox {
public:
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TiffSapiSandbox(std::optional<std::string> file = std::nullopt,
std::optional<std::string> dir = std::nullopt)
: file_(std::move(file)), dir_(std::move(dir)) {}
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private:
std::unique_ptr<sandbox2::Policy> ModifyPolicy(
sandbox2::PolicyBuilder*) override {
auto builder = std::make_unique<sandbox2::PolicyBuilder>();
(*builder)
.AllowRead()
.AllowStaticStartup()
.AllowWrite()
.AllowOpen()
.AllowExit()
.AllowStat()
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.AllowMmap()
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.AllowSystemMalloc()
.AllowSyscalls({
__NR_futex,
__NR_close,
__NR_lseek,
__NR_gettid,
__NR_sysinfo,
__NR_munmap,
});
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if (file_) {
builder->AddFile(file_.value(), /*is_ro=*/false);
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}
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if (dir_) {
builder->AddDirectory(dir_.value(), /*is_ro=*/false);
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}
return builder.get()->BuildOrDie();
}
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std::optional<std::string> file_;
std::optional<std::string> dir_;
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};
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} // namespace