6ae155d8ee
The --load-extra-key option to 'fsverity_init' was only used by odsign, and --lock was only used by init.rc. Since these uses have been removed, remove the code that implemented these options as well. Bug: 290064770 Test: presubmit Change-Id: Iaad4b78926748f24dcaddecb27dc28e4c659a574
104 lines
4 KiB
C++
104 lines
4 KiB
C++
/*
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* Copyright (C) 2019 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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// fsverity_init is a tool for loading X.509 certificates into the kernel keyring used by the
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// fsverity builtin signature verification kernel feature
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// (https://www.kernel.org/doc/html/latest/filesystems/fsverity.html#built-in-signature-verification).
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// Starting in Android 14, Android has actually stopped using this feature, as it was too inflexible
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// and caused problems. It has been replaced by userspace signature verification. Also, some uses
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// of fsverity in Android are now for integrity-only use cases.
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//
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// Regardless, there may exist fsverity files on-disk that were created by Android 13 or earlier.
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// These files still have builtin signatures. If the kernel is an older kernel that still has
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// CONFIG_FS_VERITY_BUILTIN_SIGNATURES enabled, these files cannot be opened unless the
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// corresponding key is in the ".fs-verity" keyring. Therefore, this tool still has to exist and be
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// used to load keys into the kernel, even though this has no security purpose anymore.
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//
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// This tool can be removed as soon as all supported kernels are guaranteed to have
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// CONFIG_FS_VERITY_BUILTIN_SIGNATURES disabled, or alternatively as soon as support for upgrades
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// from Android 13 or earlier is no longer required.
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//
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#define LOG_TAG "fsverity_init"
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#include <sys/types.h>
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#include <filesystem>
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#include <string>
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#include <android-base/file.h>
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#include <android-base/logging.h>
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#include <android-base/strings.h>
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#include <log/log.h>
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#include <mini_keyctl_utils.h>
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void LoadKeyFromFile(key_serial_t keyring_id, const char* keyname, const std::string& path) {
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LOG(INFO) << "LoadKeyFromFile path=" << path << " keyname=" << keyname;
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std::string content;
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if (!android::base::ReadFileToString(path, &content)) {
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LOG(ERROR) << "Failed to read key from " << path;
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return;
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}
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if (add_key("asymmetric", keyname, content.c_str(), content.size(), keyring_id) < 0) {
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PLOG(ERROR) << "Failed to add key from " << path;
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}
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}
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void LoadKeyFromDirectory(key_serial_t keyring_id, const char* keyname_prefix, const char* dir) {
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if (!std::filesystem::exists(dir)) {
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return;
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}
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int counter = 0;
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for (const auto& entry : std::filesystem::directory_iterator(dir)) {
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if (!android::base::EndsWithIgnoreCase(entry.path().c_str(), ".der")) continue;
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std::string keyname = keyname_prefix + std::to_string(counter);
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counter++;
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LoadKeyFromFile(keyring_id, keyname.c_str(), entry.path());
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}
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}
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void LoadKeyFromVerifiedPartitions(key_serial_t keyring_id) {
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// NB: Directories need to be synced with FileIntegrityService.java in
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// frameworks/base.
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LoadKeyFromDirectory(keyring_id, "fsv_system_", "/system/etc/security/fsverity");
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LoadKeyFromDirectory(keyring_id, "fsv_product_", "/product/etc/security/fsverity");
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}
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int main(int argc, const char** argv) {
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if (argc < 2) {
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LOG(ERROR) << "Not enough arguments";
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return -1;
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}
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key_serial_t keyring_id = android::GetKeyringId(".fs-verity");
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if (keyring_id < 0) {
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// This is expected on newer kernels. See comment at the beginning of this file.
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LOG(DEBUG) << "no initialization required";
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return 0;
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}
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const std::string_view command = argv[1];
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if (command == "--load-verified-keys") {
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LoadKeyFromVerifiedPartitions(keyring_id);
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} else {
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LOG(ERROR) << "Unknown argument(s).";
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return -1;
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}
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return 0;
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}
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