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83 lines
2.7 KiB
83 lines
2.7 KiB
/*
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* Copyright (C) 2017 The Android Open Source Project
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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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* http://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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*/
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/*
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* Tool to create a directory with the right SELinux context applied, or
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* apply the context if it's absent. Also fixes mode, uid, gid.
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*/
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#include <string>
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#include <vector>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <android-base/logging.h>
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#include <cutils/fs.h>
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#include <selinux/android.h>
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void usage(const char* progname) {
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fprintf(stderr, "Usage: %s --mode MODE --uid UID --gid GID -- <path>\n", progname);
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}
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bool small_int(const std::string& s) {
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return !s.empty() && s.size() < 7 && s.find_first_not_of("0123456789") == std::string::npos;
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}
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int main(int argc, const char* const argv[]) {
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setenv("ANDROID_LOG_TAGS", "*:v", 1);
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android::base::InitLogging(const_cast<char**>(argv));
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std::vector<std::string> args(argv + 1, argv + argc);
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// Enforce exact format of arguments. You can always loosen but you can never tighten :)
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if (args.size() != 8 || args[0] != "--mode" || !small_int(args[1]) || args[2] != "--uid" ||
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!small_int(args[3]) || args[4] != "--gid" || !small_int(args[5]) || args[6] != "--") {
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usage(argv[0]);
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return -1;
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}
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mode_t mode = (mode_t)stoi(args[1], nullptr, 8);
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uid_t uid = (uid_t)stoi(args[3]);
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gid_t gid = (gid_t)stoi(args[5]);
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const char* path = args[7].c_str();
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struct selabel_handle* sehandle = selinux_android_file_context_handle();
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char* secontext = nullptr;
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if (sehandle) {
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if (selabel_lookup(sehandle, &secontext, path, S_IFDIR) == 0) {
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setfscreatecon(secontext);
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}
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}
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if (fs_prepare_dir(path, mode, uid, gid) != 0) {
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return -1;
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}
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if (secontext) {
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char* oldsecontext = nullptr;
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if (lgetfilecon(path, &oldsecontext) < 0) {
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PLOG(ERROR) << "Unable to read secontext for: " << path;
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return -1;
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}
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if (strcmp(secontext, oldsecontext) != 0) {
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LOG(INFO) << "Relabelling from " << oldsecontext << " to " << secontext << ": " << path;
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if (lsetfilecon(path, secontext) != 0) {
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PLOG(ERROR) << "Relabelling failed for: " << path;
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}
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}
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}
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return 0;
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}
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