mirror of
https://github.com/google/sandboxed-api.git
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547 lines
19 KiB
C++
547 lines
19 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "sapi_minitar.h" // NOLINT(build/include)
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#include "absl/status/status.h"
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#include "sandboxed_api/util/path.h"
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#include "sandboxed_api/util/status_macros.h"
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absl::Status CreateArchive(const char* initial_filename, int compress,
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const char** argv, bool verbose) {
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// We split the filename path into dirname and filename. To the filename we
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// prepend "/output/"" so that it will work with the security policy.
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std::string abs_path = MakeAbsolutePathAtCWD(std::string(initial_filename));
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auto [archive_path, filename_tmp] =
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std::move(sandbox2::file::SplitPath(abs_path));
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std::string filename = sandbox2::file::JoinPath("/output/", filename_tmp);
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std::vector<std::string> absolute_paths;
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sandbox2::util::CharPtrArrToVecString(const_cast<char* const*>(argv),
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&absolute_paths);
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std::vector<std::string> relative_paths = absolute_paths;
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std::transform(absolute_paths.begin(), absolute_paths.end(),
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absolute_paths.begin(), MakeAbsolutePathAtCWD);
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std::transform(relative_paths.begin(), relative_paths.end(),
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relative_paths.begin(), sandbox2::file::CleanPath);
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// At this point, we have the relative and absolute paths (cleaned) saved
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// in vectors.
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// Initialize sandbox and api objects.
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SapiLibarchiveSandboxCreate sandbox(absolute_paths, archive_path);
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SAPI_RETURN_IF_ERROR(sandbox.Init());
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LibarchiveApi api(&sandbox);
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SAPI_ASSIGN_OR_RETURN(archive * ret_archive, api.archive_write_new());
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if (ret_archive == nullptr) {
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return absl::FailedPreconditionError("Failed to create write archive");
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}
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// Treat the pointer as remote. There is no need to copy the data
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// to the client process.
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sapi::v::RemotePtr a(ret_archive);
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int rc;
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std::string msg;
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// switch (compress) {
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// case 'j':
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// case 'y':
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if (compress == 'j' || compress == 'y') {
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_write_add_filter_bzip2(&a));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from write_add_filter_bzip2 call");
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}
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// break;
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} else if (compress == 'Z') {
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// case 'Z':
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_write_add_filter_compress(&a));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from write_add_filter_compress call");
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}
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// break;
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} else if (compress == 'z') {
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// case 'z':
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_write_add_filter_gzip(&a));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from write_add_filter_gzip call");
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}
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// break;
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} else {
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// default:
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_write_add_filter_none(&a));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from write_add_filter_none call");
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}
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// break;
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_write_set_format_ustar(&a));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from write_set_format_ustar call");
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}
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const char* filename_ptr = filename.data();
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if (filename_ptr != nullptr && strcmp(filename_ptr, "-") == 0) {
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filename_ptr = nullptr;
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}
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SAPI_ASSIGN_OR_RETURN(rc,
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api.archive_write_open_filename(
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&a, sapi::v::ConstCStr(filename_ptr).PtrBefore()));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from write_open_filename call");
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}
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int file_idx = 0;
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// We can directly use the vectors defined before.
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for (int file_idx = 0; file_idx < absolute_paths.size(); ++file_idx) {
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SAPI_ASSIGN_OR_RETURN(ret_archive, api.archive_read_disk_new());
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if (ret_archive == nullptr) {
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return absl::FailedPreconditionError(
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"Failed to create read_disk archive");
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}
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sapi::v::RemotePtr disk(ret_archive);
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_read_disk_set_standard_lookup(&disk));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from read_disk_set_standard_lookup call");
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}
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// We use the absolute path first.
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SAPI_ASSIGN_OR_RETURN(
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rc,
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api.archive_read_disk_open(
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&disk,
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sapi::v::ConstCStr(absolute_paths[file_idx].c_str()).PtrBefore()));
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if (rc != ARCHIVE_OK) {
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SAPI_ASSIGN_OR_RETURN(msg, CheckStatusAndGetString(
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api.archive_error_string(&disk), sandbox));
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return absl::FailedPreconditionError(msg);
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}
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while (true) {
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archive_entry* ret_archive_entry;
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SAPI_ASSIGN_OR_RETURN(ret_archive_entry, api.archive_entry_new());
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if (ret_archive_entry == nullptr) {
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return absl::FailedPreconditionError("Failed to create archive_entry");
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}
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sapi::v::RemotePtr entry(ret_archive_entry);
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_read_next_header2(&disk, &entry));
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if (rc == ARCHIVE_EOF) {
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break;
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}
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if (rc != ARCHIVE_OK) {
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SAPI_ASSIGN_OR_RETURN(
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msg,
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CheckStatusAndGetString(api.archive_error_string(&disk), sandbox));
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return absl::FailedPreconditionError(msg);
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_read_disk_descend(&disk));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError("read_disk_descend call failed");
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}
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// After using the absolute path before, we now need to add the pathname
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// to the archive entry. This would help store the files by their relative
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// paths(similar to the usual tar command).
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// However, in the case where a directory is added to the archive,
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// all of the files inside of it are added as well so we replace the
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// absolute path prefix with the relative one.
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// Example:
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// we add the folder "test_files" which becomes
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// "/absolute/path/test_files" and the files inside of it will become
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// similar to "/absolute/path/test_files/file1"
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// which we then change to "test_files/file1" so that it is relative.
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SAPI_ASSIGN_OR_RETURN(
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std::string path_name,
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CheckStatusAndGetString(api.archive_entry_pathname(&entry), sandbox));
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path_name.replace(path_name.begin(),
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path_name.begin() + absolute_paths[file_idx].length(),
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relative_paths[file_idx]);
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// On top of those changes, we need to remove leading '/' characters
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// and also remove everything up to the last occurrence of '../'.
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size_t found = path_name.find_first_not_of("/");
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if (found != std::string::npos) {
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path_name.erase(path_name.begin(), path_name.begin() + found);
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}
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// Search either for the last '/../' or check if
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// the path has '../' in the beginning.
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found = path_name.rfind("/../");
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if (found != std::string::npos) {
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path_name = path_name.substr(found + 4);
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} else if (path_name.substr(0, 3) == "../") {
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path_name = path_name.substr(3);
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}
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SAPI_RETURN_IF_ERROR(api.archive_entry_set_pathname(
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&entry, sapi::v::ConstCStr(path_name.c_str()).PtrBefore()));
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if (verbose) {
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SAPI_ASSIGN_OR_RETURN(
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msg, CheckStatusAndGetString(api.archive_entry_pathname(&entry),
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sandbox));
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std::cout << msg << std::endl;
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_write_header(&a, &entry));
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if (rc < ARCHIVE_OK) {
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SAPI_ASSIGN_OR_RETURN(msg, CheckStatusAndGetString(
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api.archive_error_string(&a), sandbox));
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std::cout << msg << std::endl;
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}
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if (rc == ARCHIVE_FATAL) {
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return absl::FailedPreconditionError(
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"Unexpected result from write_header call");
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}
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// In the following section, the calls (read, archive_write_data) are done
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// on the sandboxed process since we do not need to transfer the data in
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// the client process.
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if (rc > ARCHIVE_FAILED) {
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SAPI_ASSIGN_OR_RETURN(
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msg, CheckStatusAndGetString(api.archive_entry_sourcepath(&entry),
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sandbox));
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int fd = open(msg.c_str(), O_RDONLY);
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if (fd < 0) {
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return absl::FailedPreconditionError("Could not open file");
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}
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sapi::v::Fd sapi_fd(fd);
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sapi::v::Int read_ret;
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sapi::v::Array<char> buff(kBuffSize);
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sapi::v::UInt ssize(kBuffSize);
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// We allocate the buffer remotely and then we can simply use the
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// remote pointer(with PtrNone).
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// This allows us to keep the data in the remote process without always
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// transferring the memory.
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SAPI_RETURN_IF_ERROR(sandbox.Allocate(&buff, true));
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// We can use sapi methods that help us with file descriptors.
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SAPI_RETURN_IF_ERROR(sandbox.TransferToSandboxee(&sapi_fd));
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SAPI_RETURN_IF_ERROR(
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sandbox.Call("read", &read_ret, &sapi_fd, buff.PtrNone(), &ssize));
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while (read_ret.GetValue() > 0) {
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SAPI_ASSIGN_OR_RETURN(
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rc,
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api.archive_write_data(&a, buff.PtrNone(), read_ret.GetValue()));
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SAPI_RETURN_IF_ERROR(sandbox.Call("read", &read_ret, &sapi_fd,
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buff.PtrNone(), &ssize));
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}
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// sapi_fd variable goes out of scope here so both the local and the
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// remote file descriptors are closed.
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}
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SAPI_RETURN_IF_ERROR(api.archive_entry_free(&entry));
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_read_close(&disk));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from read_close call");
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_read_free(&disk));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from read_free call");
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}
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_write_close(&a));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from write_close call");
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_write_free(&a));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from write_free call");
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}
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return absl::OkStatus();
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}
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absl::Status ExtractArchive(const char* filename, int do_extract, int flags,
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bool verbose) {
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std::string tmp_dir;
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if (do_extract) {
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SAPI_ASSIGN_OR_RETURN(tmp_dir, CreateTempDirAtCWD());
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}
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// We can use a struct like this in order to delete the temporary
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// directory that was created earlier whenever the function ends.
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struct ExtractTempDirectoryCleanup {
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ExtractTempDirectoryCleanup(const std::string& dir) : dir_(dir) {}
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~ExtractTempDirectoryCleanup() {
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sandbox2::file_util::fileops::DeleteRecursively(dir_);
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}
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private:
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std::string dir_;
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};
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// We should only delete it if the do_extract flag is true which
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// means that this struct is instantiated only in that case.
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auto cleanup_ptr =
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do_extract ? std::make_unique<ExtractTempDirectoryCleanup>(tmp_dir)
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: nullptr;
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std::string filename_absolute = MakeAbsolutePathAtCWD(filename);
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// Initialize sandbox and api objects.
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SapiLibarchiveSandboxExtract sandbox(filename_absolute, do_extract, tmp_dir);
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SAPI_RETURN_IF_ERROR(sandbox.Init());
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LibarchiveApi api(&sandbox);
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SAPI_ASSIGN_OR_RETURN(archive * ret_archive, api.archive_read_new());
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if (ret_archive == nullptr) {
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return absl::FailedPreconditionError("Failed to create read archive");
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}
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sapi::v::RemotePtr a(ret_archive);
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SAPI_ASSIGN_OR_RETURN(ret_archive, api.archive_write_disk_new());
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if (ret_archive == nullptr) {
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return absl::FailedPreconditionError("Failed to create write disk archive");
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}
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sapi::v::RemotePtr ext(ret_archive);
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int rc;
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std::string msg;
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_write_disk_set_options(&ext, flags));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from write_disk_set_options call");
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_read_support_filter_bzip2(&a));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from read_support_filter_bzip2 call");
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_read_support_filter_gzip(&a));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from read_suppport_filter_gzip call");
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_read_support_filter_compress(&a));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from read_support_filter_compress call");
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_read_support_format_tar(&a));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result fromread_support_format_tar call");
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_read_support_format_cpio(&a));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from read_support_format_tar call");
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_write_disk_set_standard_lookup(&ext));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from write_disk_set_standard_lookup call");
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}
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const char* filename_ptr = filename_absolute.c_str();
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if (filename_ptr != nullptr && strcmp(filename_ptr, "-") == 0) {
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filename_ptr = nullptr;
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}
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// The entries are saved with a relative path so they are all created
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// relative to the current working directory.
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SAPI_ASSIGN_OR_RETURN(
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rc, api.archive_read_open_filename(
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&a, sapi::v::ConstCStr(filename_ptr).PtrBefore(), kBlockSize));
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if (rc != ARCHIVE_OK) {
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SAPI_ASSIGN_OR_RETURN(
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msg, CheckStatusAndGetString(api.archive_error_string(&a), sandbox));
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return absl::FailedPreconditionError(msg);
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}
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while (true) {
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sapi::v::IntBase<archive_entry*> entry_ptr_tmp(0);
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SAPI_ASSIGN_OR_RETURN(
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rc, api.archive_read_next_header(&a, entry_ptr_tmp.PtrAfter()));
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if (rc == ARCHIVE_EOF) {
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break;
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}
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if (rc != ARCHIVE_OK) {
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SAPI_ASSIGN_OR_RETURN(
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msg, CheckStatusAndGetString(api.archive_error_string(&a), sandbox));
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return absl::FailedPreconditionError(msg);
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}
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sapi::v::RemotePtr entry(entry_ptr_tmp.GetValue());
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if (verbose && do_extract) {
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std::cout << "x ";
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}
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if (verbose || !do_extract) {
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SAPI_ASSIGN_OR_RETURN(
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msg,
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CheckStatusAndGetString(api.archive_entry_pathname(&entry), sandbox));
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std::cout << msg << std::endl;
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}
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if (do_extract) {
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_write_header(&ext, &entry));
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if (rc != ARCHIVE_OK) {
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SAPI_ASSIGN_OR_RETURN(msg, CheckStatusAndGetString(
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api.archive_error_string(&a), sandbox));
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std::cout << msg << std::endl;
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} else {
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SAPI_ASSIGN_OR_RETURN(rc, CopyData(&a, &ext, api, sandbox));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Failed to copy data between archive structs.");
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}
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}
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}
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_read_close(&a));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected value from read_close call");
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_read_free(&a));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from read_free call");
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_write_close(&ext));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from write_close call");
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}
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SAPI_ASSIGN_OR_RETURN(rc, api.archive_write_free(&ext));
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if (rc != ARCHIVE_OK) {
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return absl::FailedPreconditionError(
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"Unexpected result from write_free call");
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}
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return absl::OkStatus();
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}
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|
|
absl::StatusOr<int> CopyData(sapi::v::RemotePtr* ar, sapi::v::RemotePtr* aw,
|
|
LibarchiveApi& api,
|
|
SapiLibarchiveSandboxExtract& sandbox) {
|
|
int rc;
|
|
std::string msg;
|
|
|
|
sapi::v::IntBase<archive_entry*> buff_ptr_tmp(0);
|
|
sapi::v::ULLong size;
|
|
sapi::v::SLLong offset;
|
|
|
|
while (true) {
|
|
SAPI_ASSIGN_OR_RETURN(
|
|
rc, api.archive_read_data_block(ar, buff_ptr_tmp.PtrAfter(),
|
|
size.PtrAfter(), offset.PtrAfter()));
|
|
|
|
if (rc == ARCHIVE_EOF) {
|
|
return ARCHIVE_OK;
|
|
}
|
|
if (rc != ARCHIVE_OK) {
|
|
SAPI_ASSIGN_OR_RETURN(
|
|
msg, CheckStatusAndGetString(api.archive_error_string(ar), sandbox));
|
|
std::cout << msg << std::endl;
|
|
return rc;
|
|
}
|
|
|
|
sapi::v::RemotePtr buff(buff_ptr_tmp.GetValue());
|
|
|
|
SAPI_ASSIGN_OR_RETURN(
|
|
rc, api.archive_write_data_block(aw, &buff, size.GetValue(),
|
|
offset.GetValue()));
|
|
|
|
if (rc != ARCHIVE_OK) {
|
|
SAPI_ASSIGN_OR_RETURN(
|
|
msg, CheckStatusAndGetString(api.archive_error_string(ar), sandbox));
|
|
std::cout << msg << std::endl;
|
|
return rc;
|
|
}
|
|
}
|
|
}
|
|
|
|
std::string MakeAbsolutePathAtCWD(const std::string& path) {
|
|
std::string result = sandbox2::file_util::fileops::MakeAbsolute(
|
|
path, sandbox2::file_util::fileops::GetCWD());
|
|
CHECK(result != "") << "Could not create absolute path for: " << path;
|
|
return sandbox2::file::CleanPath(result);
|
|
}
|
|
|
|
absl::StatusOr<std::string> CheckStatusAndGetString(
|
|
const absl::StatusOr<char*>& status, LibarchiveSandbox& sandbox) {
|
|
SAPI_ASSIGN_OR_RETURN(char* str, status);
|
|
if (str == nullptr) {
|
|
return absl::FailedPreconditionError("Could not get string from archive");
|
|
}
|
|
return sandbox.GetCString(sapi::v::RemotePtr(str));
|
|
}
|
|
|
|
absl::StatusOr<std::string> CreateTempDirAtCWD() {
|
|
std::string cwd = sandbox2::file_util::fileops::GetCWD();
|
|
CHECK(!cwd.empty()) << "Could not get current working directory";
|
|
cwd.append("/");
|
|
|
|
SAPI_ASSIGN_OR_RETURN(std::string result, sandbox2::CreateTempDir(cwd));
|
|
return result;
|
|
}
|