1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "fsverity_init"
18
19 #include <sys/types.h>
20
21 #include <filesystem>
22 #include <string>
23
24 #include <android-base/file.h>
25 #include <android-base/logging.h>
26 #include <android-base/properties.h>
27 #include <android-base/strings.h>
28 #include <log/log.h>
29 #include <mini_keyctl_utils.h>
30
LoadKeyToKeyring(key_serial_t keyring_id,const char * desc,const char * data,size_t size)31 bool LoadKeyToKeyring(key_serial_t keyring_id, const char* desc, const char* data, size_t size) {
32 key_serial_t key = add_key("asymmetric", desc, data, size, keyring_id);
33 if (key < 0) {
34 PLOG(ERROR) << "Failed to add key";
35 return false;
36 }
37 return true;
38 }
39
LoadKeyFromStdin(key_serial_t keyring_id,const char * keyname)40 bool LoadKeyFromStdin(key_serial_t keyring_id, const char* keyname) {
41 std::string content;
42 if (!android::base::ReadFdToString(STDIN_FILENO, &content)) {
43 LOG(ERROR) << "Failed to read key from stdin";
44 return false;
45 }
46 if (!LoadKeyToKeyring(keyring_id, keyname, content.c_str(), content.size())) {
47 LOG(ERROR) << "Failed to load key from stdin";
48 return false;
49 }
50 return true;
51 }
52
LoadKeyFromFile(key_serial_t keyring_id,const char * keyname,const std::string & path)53 void LoadKeyFromFile(key_serial_t keyring_id, const char* keyname, const std::string& path) {
54 LOG(INFO) << "LoadKeyFromFile path=" << path << " keyname=" << keyname;
55 std::string content;
56 if (!android::base::ReadFileToString(path, &content)) {
57 LOG(ERROR) << "Failed to read key from " << path;
58 return;
59 }
60 if (!LoadKeyToKeyring(keyring_id, keyname, content.c_str(), content.size())) {
61 LOG(ERROR) << "Failed to load key from " << path;
62 }
63 }
64
LoadKeyFromDirectory(key_serial_t keyring_id,const char * keyname_prefix,const char * dir)65 void LoadKeyFromDirectory(key_serial_t keyring_id, const char* keyname_prefix, const char* dir) {
66 if (!std::filesystem::exists(dir)) {
67 return;
68 }
69 int counter = 0;
70 for (const auto& entry : std::filesystem::directory_iterator(dir)) {
71 if (!android::base::EndsWithIgnoreCase(entry.path().c_str(), ".der")) continue;
72 std::string keyname = keyname_prefix + std::to_string(counter);
73 counter++;
74 LoadKeyFromFile(keyring_id, keyname.c_str(), entry.path());
75 }
76 }
77
LoadKeyFromVerifiedPartitions(key_serial_t keyring_id)78 void LoadKeyFromVerifiedPartitions(key_serial_t keyring_id) {
79 // NB: Directories need to be synced with FileIntegrityService.java in
80 // frameworks/base.
81 LoadKeyFromDirectory(keyring_id, "fsv_system_", "/system/etc/security/fsverity");
82 LoadKeyFromDirectory(keyring_id, "fsv_product_", "/product/etc/security/fsverity");
83 }
84