Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 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 | // Note that these check functions cannot check expanded arguments from properties, since they will |
| 18 | // not know what those properties would be at runtime. They will be passed an empty string in the |
| 19 | // situation that the input line had a property expansion without a default value, since an empty |
| 20 | // string is otherwise an impossible value. They should therefore disregard checking empty |
| 21 | // arguments. |
| 22 | |
| 23 | #include "check_builtins.h" |
| 24 | |
| 25 | #include <sys/time.h> |
| 26 | |
| 27 | #include <android-base/logging.h> |
Mark Salyzyn | 61de0d2 | 2020-05-14 09:20:30 -0700 | [diff] [blame] | 28 | #include <android-base/parsedouble.h> |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 29 | #include <android-base/parseint.h> |
| 30 | #include <android-base/strings.h> |
| 31 | |
| 32 | #include "builtin_arguments.h" |
Tom Cherry | b5f2ec0 | 2019-11-08 17:54:27 -0800 | [diff] [blame] | 33 | #include "host_init_verifier.h" |
Daniel Norman | d2533c3 | 2019-08-02 15:13:50 -0700 | [diff] [blame] | 34 | #include "interface_utils.h" |
Tom Cherry | b5f2ec0 | 2019-11-08 17:54:27 -0800 | [diff] [blame] | 35 | #include "property_type.h" |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 36 | #include "rlimit_parser.h" |
| 37 | #include "service.h" |
| 38 | #include "util.h" |
| 39 | |
| 40 | using android::base::ParseInt; |
| 41 | using android::base::StartsWith; |
| 42 | |
| 43 | #define ReturnIfAnyArgsEmpty() \ |
| 44 | for (const auto& arg : args) { \ |
| 45 | if (arg.empty()) { \ |
| 46 | return {}; \ |
| 47 | } \ |
| 48 | } |
| 49 | |
| 50 | namespace android { |
| 51 | namespace init { |
| 52 | |
| 53 | Result<void> check_chown(const BuiltinArguments& args) { |
| 54 | if (!args[1].empty()) { |
| 55 | auto uid = DecodeUid(args[1]); |
Bernie Innocenti | cecebbb | 2020-02-06 03:49:33 +0900 | [diff] [blame] | 56 | if (!uid.ok()) { |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 57 | return Error() << "Unable to decode UID for '" << args[1] << "': " << uid.error(); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | // GID is optional and pushes the index of path out by one if specified. |
| 62 | if (args.size() == 4 && !args[2].empty()) { |
| 63 | auto gid = DecodeUid(args[2]); |
Bernie Innocenti | cecebbb | 2020-02-06 03:49:33 +0900 | [diff] [blame] | 64 | if (!gid.ok()) { |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 65 | return Error() << "Unable to decode GID for '" << args[2] << "': " << gid.error(); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | return {}; |
| 70 | } |
| 71 | |
| 72 | Result<void> check_exec(const BuiltinArguments& args) { |
| 73 | ReturnIfAnyArgsEmpty(); |
| 74 | |
| 75 | auto result = Service::MakeTemporaryOneshotService(args.args); |
Bernie Innocenti | cecebbb | 2020-02-06 03:49:33 +0900 | [diff] [blame] | 76 | if (!result.ok()) { |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 77 | return result.error(); |
| 78 | } |
| 79 | |
| 80 | return {}; |
| 81 | } |
| 82 | |
| 83 | Result<void> check_exec_background(const BuiltinArguments& args) { |
| 84 | return check_exec(std::move(args)); |
| 85 | } |
| 86 | |
Tom Cherry | 7896e7a | 2019-09-04 15:26:52 -0700 | [diff] [blame] | 87 | Result<void> check_exec_reboot_on_failure(const BuiltinArguments& args) { |
| 88 | BuiltinArguments remaining_args(args.context); |
| 89 | |
| 90 | remaining_args.args = std::vector<std::string>(args.begin() + 1, args.end()); |
| 91 | remaining_args.args[0] = args[0]; |
| 92 | |
| 93 | return check_exec(remaining_args); |
| 94 | } |
| 95 | |
Daniel Norman | d2533c3 | 2019-08-02 15:13:50 -0700 | [diff] [blame] | 96 | Result<void> check_interface_restart(const BuiltinArguments& args) { |
Bernie Innocenti | cecebbb | 2020-02-06 03:49:33 +0900 | [diff] [blame] | 97 | if (auto result = IsKnownInterface(args[1]); !result.ok()) { |
Daniel Norman | d2533c3 | 2019-08-02 15:13:50 -0700 | [diff] [blame] | 98 | return result.error(); |
| 99 | } |
| 100 | return {}; |
| 101 | } |
| 102 | |
| 103 | Result<void> check_interface_start(const BuiltinArguments& args) { |
| 104 | return check_interface_restart(std::move(args)); |
| 105 | } |
| 106 | |
| 107 | Result<void> check_interface_stop(const BuiltinArguments& args) { |
| 108 | return check_interface_restart(std::move(args)); |
| 109 | } |
| 110 | |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 111 | Result<void> check_load_system_props(const BuiltinArguments& args) { |
| 112 | return Error() << "'load_system_props' is deprecated"; |
| 113 | } |
| 114 | |
| 115 | Result<void> check_loglevel(const BuiltinArguments& args) { |
| 116 | ReturnIfAnyArgsEmpty(); |
| 117 | |
| 118 | int log_level = -1; |
| 119 | ParseInt(args[1], &log_level); |
| 120 | if (log_level < 0 || log_level > 7) { |
| 121 | return Error() << "loglevel must be in the range of 0-7"; |
| 122 | } |
| 123 | return {}; |
| 124 | } |
| 125 | |
Alistair Delva | c631f94 | 2020-05-20 16:24:00 -0700 | [diff] [blame] | 126 | Result<void> check_mount_all(const BuiltinArguments& args) { |
| 127 | auto options = ParseMountAll(args.args); |
| 128 | if (!options.ok()) { |
| 129 | return options.error(); |
| 130 | } |
| 131 | return {}; |
| 132 | } |
| 133 | |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 134 | Result<void> check_mkdir(const BuiltinArguments& args) { |
Paul Crowley | 68258e8 | 2019-10-28 07:55:03 -0700 | [diff] [blame] | 135 | auto options = ParseMkdir(args.args); |
Bernie Innocenti | cecebbb | 2020-02-06 03:49:33 +0900 | [diff] [blame] | 136 | if (!options.ok()) { |
Paul Crowley | 68258e8 | 2019-10-28 07:55:03 -0700 | [diff] [blame] | 137 | return options.error(); |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 138 | } |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 139 | return {}; |
| 140 | } |
| 141 | |
| 142 | Result<void> check_restorecon(const BuiltinArguments& args) { |
| 143 | ReturnIfAnyArgsEmpty(); |
| 144 | |
| 145 | auto restorecon_info = ParseRestorecon(args.args); |
Bernie Innocenti | cecebbb | 2020-02-06 03:49:33 +0900 | [diff] [blame] | 146 | if (!restorecon_info.ok()) { |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 147 | return restorecon_info.error(); |
| 148 | } |
| 149 | |
| 150 | return {}; |
| 151 | } |
| 152 | |
| 153 | Result<void> check_restorecon_recursive(const BuiltinArguments& args) { |
| 154 | return check_restorecon(std::move(args)); |
| 155 | } |
| 156 | |
| 157 | Result<void> check_setprop(const BuiltinArguments& args) { |
| 158 | const std::string& name = args[1]; |
| 159 | if (name.empty()) { |
| 160 | return {}; |
| 161 | } |
| 162 | const std::string& value = args[2]; |
| 163 | |
| 164 | if (!IsLegalPropertyName(name)) { |
| 165 | return Error() << "'" << name << "' is not a legal property name"; |
| 166 | } |
| 167 | |
| 168 | if (!value.empty()) { |
Bernie Innocenti | cecebbb | 2020-02-06 03:49:33 +0900 | [diff] [blame] | 169 | if (auto result = IsLegalPropertyValue(name, value); !result.ok()) { |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 170 | return result.error(); |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | if (StartsWith(name, "ctl.")) { |
| 175 | return Error() |
| 176 | << "Do not set ctl. properties from init; call the Service functions directly"; |
| 177 | } |
| 178 | |
| 179 | static constexpr const char kRestoreconProperty[] = "selinux.restorecon_recursive"; |
| 180 | if (name == kRestoreconProperty) { |
| 181 | return Error() << "Do not set '" << kRestoreconProperty |
| 182 | << "' from init; use the restorecon builtin directly"; |
| 183 | } |
| 184 | |
Tom Cherry | b5f2ec0 | 2019-11-08 17:54:27 -0800 | [diff] [blame] | 185 | const char* target_context = nullptr; |
| 186 | const char* type = nullptr; |
| 187 | property_info_area->GetPropertyInfo(name.c_str(), &target_context, &type); |
| 188 | |
| 189 | if (!CheckType(type, value)) { |
| 190 | return Error() << "Property type check failed, value doesn't match expected type '" |
| 191 | << (type ?: "(null)") << "'"; |
| 192 | } |
| 193 | |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 194 | return {}; |
| 195 | } |
| 196 | |
| 197 | Result<void> check_setrlimit(const BuiltinArguments& args) { |
| 198 | ReturnIfAnyArgsEmpty(); |
| 199 | |
| 200 | auto rlimit = ParseRlimit(args.args); |
Bernie Innocenti | cecebbb | 2020-02-06 03:49:33 +0900 | [diff] [blame] | 201 | if (!rlimit.ok()) return rlimit.error(); |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 202 | return {}; |
| 203 | } |
| 204 | |
Alistair Delva | afaa5fb | 2020-06-08 11:04:53 -0700 | [diff] [blame] | 205 | Result<void> check_swapon_all(const BuiltinArguments& args) { |
| 206 | auto options = ParseSwaponAll(args.args); |
| 207 | if (!options.ok()) { |
| 208 | return options.error(); |
| 209 | } |
| 210 | return {}; |
| 211 | } |
| 212 | |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 213 | Result<void> check_sysclktz(const BuiltinArguments& args) { |
| 214 | ReturnIfAnyArgsEmpty(); |
| 215 | |
| 216 | struct timezone tz = {}; |
| 217 | if (!android::base::ParseInt(args[1], &tz.tz_minuteswest)) { |
| 218 | return Error() << "Unable to parse mins_west_of_gmt"; |
| 219 | } |
| 220 | return {}; |
| 221 | } |
| 222 | |
Alistair Delva | c631f94 | 2020-05-20 16:24:00 -0700 | [diff] [blame] | 223 | Result<void> check_umount_all(const BuiltinArguments& args) { |
| 224 | auto options = ParseUmountAll(args.args); |
| 225 | if (!options.ok()) { |
| 226 | return options.error(); |
| 227 | } |
| 228 | return {}; |
| 229 | } |
| 230 | |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 231 | Result<void> check_wait(const BuiltinArguments& args) { |
| 232 | if (args.size() == 3 && !args[2].empty()) { |
Mark Salyzyn | 61de0d2 | 2020-05-14 09:20:30 -0700 | [diff] [blame] | 233 | double timeout_double; |
| 234 | if (!android::base::ParseDouble(args[2], &timeout_double, 0)) { |
Tom Cherry | 4772f1d | 2019-07-30 09:34:41 -0700 | [diff] [blame] | 235 | return Error() << "failed to parse timeout"; |
| 236 | } |
| 237 | } |
| 238 | return {}; |
| 239 | } |
| 240 | |
| 241 | Result<void> check_wait_for_prop(const BuiltinArguments& args) { |
| 242 | return check_setprop(std::move(args)); |
| 243 | } |
| 244 | |
| 245 | } // namespace init |
| 246 | } // namespace android |