mirror of https://github.com/facebook/rocksdb.git
130 lines
4.4 KiB
C++
130 lines
4.4 KiB
C++
// Copyright (c) 2016-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#if !defined(ROCKSDB_LITE) && !defined(OS_WIN)
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#include "env/env_chroot.h"
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#include <errno.h> // errno
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#include <stdlib.h> // realpath, free
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#include <unistd.h> // geteuid
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#include "env/composite_env_wrapper.h"
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#include "env/fs_remap.h"
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#include "util/string_util.h" // errnoStr
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namespace ROCKSDB_NAMESPACE {
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namespace {
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class ChrootFileSystem : public RemapFileSystem {
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public:
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ChrootFileSystem(const std::shared_ptr<FileSystem>& base,
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const std::string& chroot_dir)
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: RemapFileSystem(base) {
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#if defined(OS_AIX)
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char resolvedName[PATH_MAX];
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char* real_chroot_dir = realpath(chroot_dir.c_str(), resolvedName);
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#else
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char* real_chroot_dir = realpath(chroot_dir.c_str(), nullptr);
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#endif
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// chroot_dir must exist so realpath() returns non-nullptr.
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assert(real_chroot_dir != nullptr);
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chroot_dir_ = real_chroot_dir;
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#if !defined(OS_AIX)
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free(real_chroot_dir);
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#endif
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}
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const char* Name() const override { return "ChrootFS"; }
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IOStatus GetTestDirectory(const IOOptions& options, std::string* path,
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IODebugContext* dbg) override {
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// Adapted from PosixEnv's implementation since it doesn't provide a way to
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// create directory in the chroot.
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char buf[256];
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snprintf(buf, sizeof(buf), "/rocksdbtest-%d", static_cast<int>(geteuid()));
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*path = buf;
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// Directory may already exist, so ignore return
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return CreateDirIfMissing(*path, options, dbg);
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}
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protected:
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// Returns status and expanded absolute path including the chroot directory.
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// Checks whether the provided path breaks out of the chroot. If it returns
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// non-OK status, the returned path should not be used.
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std::pair<IOStatus, std::string> EncodePath(
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const std::string& path) override {
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if (path.empty() || path[0] != '/') {
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return {IOStatus::InvalidArgument(path, "Not an absolute path"), ""};
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}
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std::pair<IOStatus, std::string> res;
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res.second = chroot_dir_ + path;
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#if defined(OS_AIX)
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char resolvedName[PATH_MAX];
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char* normalized_path = realpath(res.second.c_str(), resolvedName);
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#else
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char* normalized_path = realpath(res.second.c_str(), nullptr);
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#endif
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if (normalized_path == nullptr) {
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res.first = IOStatus::NotFound(res.second, errnoStr(errno).c_str());
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} else if (strlen(normalized_path) < chroot_dir_.size() ||
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strncmp(normalized_path, chroot_dir_.c_str(),
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chroot_dir_.size()) != 0) {
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res.first = IOStatus::IOError(res.second,
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"Attempted to access path outside chroot");
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} else {
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res.first = IOStatus::OK();
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}
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#if !defined(OS_AIX)
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free(normalized_path);
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#endif
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return res;
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}
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// Similar to EncodePath() except assumes the basename in the path hasn't been
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// created yet.
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std::pair<IOStatus, std::string> EncodePathWithNewBasename(
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const std::string& path) override {
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if (path.empty() || path[0] != '/') {
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return {IOStatus::InvalidArgument(path, "Not an absolute path"), ""};
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}
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// Basename may be followed by trailing slashes
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size_t final_idx = path.find_last_not_of('/');
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if (final_idx == std::string::npos) {
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// It's only slashes so no basename to extract
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return EncodePath(path);
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}
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// Pull off the basename temporarily since realname(3) (used by
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// EncodePath()) requires a path that exists
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size_t base_sep = path.rfind('/', final_idx);
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auto status_and_enc_path = EncodePath(path.substr(0, base_sep + 1));
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status_and_enc_path.second.append(path.substr(base_sep + 1));
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return status_and_enc_path;
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}
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private:
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std::string chroot_dir_;
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};
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} // namespace
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std::shared_ptr<FileSystem> NewChrootFileSystem(
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const std::shared_ptr<FileSystem>& base, const std::string& chroot_dir) {
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return std::make_shared<ChrootFileSystem>(base, chroot_dir);
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}
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Env* NewChrootEnv(Env* base_env, const std::string& chroot_dir) {
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if (!base_env->FileExists(chroot_dir).ok()) {
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return nullptr;
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}
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std::shared_ptr<FileSystem> chroot_fs =
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NewChrootFileSystem(base_env->GetFileSystem(), chroot_dir);
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return new CompositeEnvWrapper(base_env, chroot_fs);
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}
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} // namespace ROCKSDB_NAMESPACE
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#endif // !defined(ROCKSDB_LITE) && !defined(OS_WIN)
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