The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 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 | |
Tom Cherry | 3f5eaae5 | 2017-04-06 16:30:22 -0700 | [diff] [blame] | 17 | #include "property_service.h" |
| 18 | |
| 19 | #include <ctype.h> |
Tom Cherry | 3f5eaae5 | 2017-04-06 16:30:22 -0700 | [diff] [blame] | 20 | #include <errno.h> |
| 21 | #include <fcntl.h> |
Keun-young Park | 7d32026 | 2017-02-17 17:48:56 -0800 | [diff] [blame] | 22 | #include <inttypes.h> |
Tom Cherry | 3f5eaae5 | 2017-04-06 16:30:22 -0700 | [diff] [blame] | 23 | #include <limits.h> |
| 24 | #include <netinet/in.h> |
| 25 | #include <stdarg.h> |
Tom Cherry | f57c0bf | 2017-04-07 13:46:21 -0700 | [diff] [blame] | 26 | #include <stddef.h> |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 27 | #include <stdio.h> |
| 28 | #include <stdlib.h> |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 29 | #include <string.h> |
Tom Cherry | 3f5eaae5 | 2017-04-06 16:30:22 -0700 | [diff] [blame] | 30 | #include <sys/mman.h> |
JP Abgrall | 4515d81 | 2014-01-31 14:37:07 -0800 | [diff] [blame] | 31 | #include <sys/poll.h> |
Tom Cherry | 3f5eaae5 | 2017-04-06 16:30:22 -0700 | [diff] [blame] | 32 | #include <sys/select.h> |
| 33 | #include <sys/types.h> |
| 34 | #include <sys/un.h> |
| 35 | #include <unistd.h> |
Tom Cherry | 8702dcb | 2017-10-13 16:20:19 -0700 | [diff] [blame] | 36 | #include <wchar.h> |
Elliott Hughes | 81399e1 | 2015-03-10 08:39:45 -0700 | [diff] [blame] | 37 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 38 | #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ |
| 39 | #include <sys/_system_properties.h> |
| 40 | |
Tom Cherry | 3f5eaae5 | 2017-04-06 16:30:22 -0700 | [diff] [blame] | 41 | #include <memory> |
Tom Marshall | 6269690 | 2017-06-09 18:29:23 +0000 | [diff] [blame] | 42 | #include <queue> |
Tom Cherry | 3f5eaae5 | 2017-04-06 16:30:22 -0700 | [diff] [blame] | 43 | #include <vector> |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 44 | |
Tom Cherry | ede0d53 | 2017-07-06 14:20:11 -0700 | [diff] [blame] | 45 | #include <android-base/chrono_utils.h> |
Elliott Hughes | 4f71319 | 2015-12-04 22:00:26 -0800 | [diff] [blame] | 46 | #include <android-base/file.h> |
Tom Cherry | 3f5eaae5 | 2017-04-06 16:30:22 -0700 | [diff] [blame] | 47 | #include <android-base/logging.h> |
Jaekyun Seok | 0cf3a07 | 2017-04-24 18:52:54 +0900 | [diff] [blame] | 48 | #include <android-base/properties.h> |
Tom Cherry | a84e14d | 2017-09-05 12:38:30 -0700 | [diff] [blame] | 49 | #include <android-base/stringprintf.h> |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 50 | #include <android-base/strings.h> |
Tom Cherry | 3f5eaae5 | 2017-04-06 16:30:22 -0700 | [diff] [blame] | 51 | #include <bootimg.h> |
| 52 | #include <fs_mgr.h> |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 53 | #include <property_info_parser/property_info_parser.h> |
| 54 | #include <property_info_serializer/property_info_serializer.h> |
Tom Cherry | 3f5eaae5 | 2017-04-06 16:30:22 -0700 | [diff] [blame] | 55 | #include <selinux/android.h> |
| 56 | #include <selinux/label.h> |
| 57 | #include <selinux/selinux.h> |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 58 | |
Mark Salyzyn | 6c6ec72 | 2015-10-24 16:20:18 -0700 | [diff] [blame] | 59 | #include "epoll.h" |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 60 | #include "init.h" |
Tom Cherry | 16fad42 | 2017-08-04 15:59:03 -0700 | [diff] [blame] | 61 | #include "persistent_properties.h" |
Tom Cherry | 927c5d5 | 2017-12-11 01:40:07 -0800 | [diff] [blame] | 62 | #include "property_type.h" |
Logan Chien | 837b2a4 | 2018-05-03 14:33:52 +0800 | [diff] [blame] | 63 | #include "selinux.h" |
Tom Cherry | dc37586 | 2018-02-28 10:39:01 -0800 | [diff] [blame] | 64 | #include "subcontext.h" |
Colin Cross | 3899e9f | 2010-04-13 20:35:46 -0700 | [diff] [blame] | 65 | #include "util.h" |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 66 | |
Tom Cherry | dc37586 | 2018-02-28 10:39:01 -0800 | [diff] [blame] | 67 | using namespace std::literals; |
| 68 | |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 69 | using android::base::ReadFileToString; |
| 70 | using android::base::Split; |
Tom Cherry | 1cf8d69 | 2017-10-10 13:35:01 -0700 | [diff] [blame] | 71 | using android::base::StartsWith; |
Tom Cherry | a84e14d | 2017-09-05 12:38:30 -0700 | [diff] [blame] | 72 | using android::base::StringPrintf; |
Tom Cherry | ede0d53 | 2017-07-06 14:20:11 -0700 | [diff] [blame] | 73 | using android::base::Timer; |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 74 | using android::base::Trim; |
| 75 | using android::base::WriteStringToFile; |
| 76 | using android::properties::BuildTrie; |
Tom Cherry | 919458c | 2018-01-03 14:39:28 -0800 | [diff] [blame] | 77 | using android::properties::ParsePropertyInfoFile; |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 78 | using android::properties::PropertyInfoAreaFile; |
| 79 | using android::properties::PropertyInfoEntry; |
Tom Cherry | ede0d53 | 2017-07-06 14:20:11 -0700 | [diff] [blame] | 80 | |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 81 | #define RECOVERY_MOUNT_POINT "/recovery" |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 82 | |
Tom Cherry | 81f5d3e | 2017-06-22 12:53:17 -0700 | [diff] [blame] | 83 | namespace android { |
| 84 | namespace init { |
| 85 | |
Tom Cherry | 16fad42 | 2017-08-04 15:59:03 -0700 | [diff] [blame] | 86 | static bool persistent_properties_loaded = false; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 87 | |
Colin Cross | d11beb2 | 2010-04-13 19:33:37 -0700 | [diff] [blame] | 88 | static int property_set_fd = -1; |
| 89 | |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 90 | static PropertyInfoAreaFile property_info_area; |
| 91 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 92 | uint32_t InitPropertySet(const std::string& name, const std::string& value); |
| 93 | |
| 94 | uint32_t (*property_set)(const std::string& name, const std::string& value) = InitPropertySet; |
| 95 | |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 96 | void CreateSerializedPropertyInfo(); |
Tom Cherry | c3692b3 | 2017-08-10 12:22:44 -0700 | [diff] [blame] | 97 | |
Tom Cherry | 5ab2e1c | 2018-05-03 16:57:19 -0700 | [diff] [blame^] | 98 | struct PropertyAuditData { |
| 99 | const ucred* cr; |
| 100 | const char* name; |
| 101 | }; |
| 102 | |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 103 | void property_init() { |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 104 | mkdir("/dev/__properties__", S_IRWXU | S_IXGRP | S_IXOTH); |
| 105 | CreateSerializedPropertyInfo(); |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 106 | if (__system_property_area_init()) { |
Tom Cherry | 4a67945 | 2017-09-26 16:30:03 -0700 | [diff] [blame] | 107 | LOG(FATAL) << "Failed to initialize property area"; |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 108 | } |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 109 | if (!property_info_area.LoadDefaultPath()) { |
| 110 | LOG(FATAL) << "Failed to load serialized property info file"; |
| 111 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 112 | } |
Tom Cherry | 927c5d5 | 2017-12-11 01:40:07 -0800 | [diff] [blame] | 113 | static bool CheckMacPerms(const std::string& name, const char* target_context, |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 114 | const char* source_context, const ucred& cr) { |
Tom Cherry | 927c5d5 | 2017-12-11 01:40:07 -0800 | [diff] [blame] | 115 | if (!target_context || !source_context) { |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 116 | return false; |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 117 | } |
| 118 | |
Tom Cherry | 5ab2e1c | 2018-05-03 16:57:19 -0700 | [diff] [blame^] | 119 | PropertyAuditData audit_data; |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 120 | |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 121 | audit_data.name = name.c_str(); |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 122 | audit_data.cr = &cr; |
William Roberts | d7aea44 | 2015-10-01 16:03:47 -0700 | [diff] [blame] | 123 | |
Tom Cherry | 927c5d5 | 2017-12-11 01:40:07 -0800 | [diff] [blame] | 124 | bool has_access = (selinux_check_access(source_context, target_context, "property_service", |
| 125 | "set", &audit_data) == 0); |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 126 | |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 127 | return has_access; |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 128 | } |
| 129 | |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 130 | static uint32_t PropertySet(const std::string& name, const std::string& value, std::string* error) { |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 131 | size_t valuelen = value.size(); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 132 | |
Tom Cherry | de6bd50 | 2018-02-13 16:50:08 -0800 | [diff] [blame] | 133 | if (!IsLegalPropertyName(name)) { |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 134 | *error = "Illegal property name"; |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 135 | return PROP_ERROR_INVALID_NAME; |
Elliott Hughes | 331cf2f | 2016-11-29 19:20:58 +0000 | [diff] [blame] | 136 | } |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 137 | |
Tom Cherry | 1cf8d69 | 2017-10-10 13:35:01 -0700 | [diff] [blame] | 138 | if (valuelen >= PROP_VALUE_MAX && !StartsWith(name, "ro.")) { |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 139 | *error = "Property value too long"; |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 140 | return PROP_ERROR_INVALID_VALUE; |
Elliott Hughes | 331cf2f | 2016-11-29 19:20:58 +0000 | [diff] [blame] | 141 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 142 | |
Tom Cherry | 8702dcb | 2017-10-13 16:20:19 -0700 | [diff] [blame] | 143 | if (mbstowcs(nullptr, value.data(), 0) == static_cast<std::size_t>(-1)) { |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 144 | *error = "Value is not a UTF8 encoded string"; |
Tom Cherry | 8702dcb | 2017-10-13 16:20:19 -0700 | [diff] [blame] | 145 | return PROP_ERROR_INVALID_VALUE; |
| 146 | } |
| 147 | |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 148 | prop_info* pi = (prop_info*) __system_property_find(name.c_str()); |
Elliott Hughes | 331cf2f | 2016-11-29 19:20:58 +0000 | [diff] [blame] | 149 | if (pi != nullptr) { |
| 150 | // ro.* properties are actually "write-once". |
Tom Cherry | 1cf8d69 | 2017-10-10 13:35:01 -0700 | [diff] [blame] | 151 | if (StartsWith(name, "ro.")) { |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 152 | *error = "Read-only property was already set"; |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 153 | return PROP_ERROR_READ_ONLY_PROPERTY; |
Elliott Hughes | 331cf2f | 2016-11-29 19:20:58 +0000 | [diff] [blame] | 154 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 155 | |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 156 | __system_property_update(pi, value.c_str(), valuelen); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 157 | } else { |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 158 | int rc = __system_property_add(name.c_str(), name.size(), value.c_str(), valuelen); |
Elliott Hughes | db3f267 | 2015-03-20 09:45:18 -0700 | [diff] [blame] | 159 | if (rc < 0) { |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 160 | *error = "__system_property_add failed"; |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 161 | return PROP_ERROR_SET_FAILED; |
Johan Redestig | fd7ffb1 | 2013-04-29 09:11:57 +0200 | [diff] [blame] | 162 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 163 | } |
Elliott Hughes | 331cf2f | 2016-11-29 19:20:58 +0000 | [diff] [blame] | 164 | |
Elliott Hughes | 4f91581 | 2016-12-05 13:12:48 -0800 | [diff] [blame] | 165 | // Don't write properties to disk until after we have read all default |
| 166 | // properties to prevent them from being overwritten by default values. |
Tom Cherry | 1cf8d69 | 2017-10-10 13:35:01 -0700 | [diff] [blame] | 167 | if (persistent_properties_loaded && StartsWith(name, "persist.")) { |
Tom Cherry | 16fad42 | 2017-08-04 15:59:03 -0700 | [diff] [blame] | 168 | WritePersistentProperty(name, value); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 169 | } |
Tom Cherry | 98ad32a | 2017-04-17 16:34:20 -0700 | [diff] [blame] | 170 | property_changed(name, value); |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 171 | return PROP_SUCCESS; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 172 | } |
| 173 | |
Tom Marshall | 6269690 | 2017-06-09 18:29:23 +0000 | [diff] [blame] | 174 | typedef int (*PropertyAsyncFunc)(const std::string&, const std::string&); |
| 175 | |
| 176 | struct PropertyChildInfo { |
| 177 | pid_t pid; |
| 178 | PropertyAsyncFunc func; |
| 179 | std::string name; |
| 180 | std::string value; |
| 181 | }; |
| 182 | |
| 183 | static std::queue<PropertyChildInfo> property_children; |
| 184 | |
| 185 | static void PropertyChildLaunch() { |
| 186 | auto& info = property_children.front(); |
| 187 | pid_t pid = fork(); |
| 188 | if (pid < 0) { |
| 189 | LOG(ERROR) << "Failed to fork for property_set_async"; |
| 190 | while (!property_children.empty()) { |
| 191 | property_children.pop(); |
| 192 | } |
| 193 | return; |
| 194 | } |
| 195 | if (pid != 0) { |
| 196 | info.pid = pid; |
| 197 | } else { |
| 198 | if (info.func(info.name, info.value) != 0) { |
| 199 | LOG(ERROR) << "property_set_async(\"" << info.name << "\", \"" << info.value |
| 200 | << "\") failed"; |
| 201 | } |
Tom Cherry | 4a67945 | 2017-09-26 16:30:03 -0700 | [diff] [blame] | 202 | _exit(0); |
Tom Marshall | 6269690 | 2017-06-09 18:29:23 +0000 | [diff] [blame] | 203 | } |
| 204 | } |
| 205 | |
| 206 | bool PropertyChildReap(pid_t pid) { |
| 207 | if (property_children.empty()) { |
| 208 | return false; |
| 209 | } |
| 210 | auto& info = property_children.front(); |
| 211 | if (info.pid != pid) { |
| 212 | return false; |
| 213 | } |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 214 | std::string error; |
| 215 | if (PropertySet(info.name, info.value, &error) != PROP_SUCCESS) { |
| 216 | LOG(ERROR) << "Failed to set async property " << info.name << " to " << info.value << ": " |
| 217 | << error; |
Tom Marshall | 6269690 | 2017-06-09 18:29:23 +0000 | [diff] [blame] | 218 | } |
| 219 | property_children.pop(); |
| 220 | if (!property_children.empty()) { |
| 221 | PropertyChildLaunch(); |
| 222 | } |
| 223 | return true; |
| 224 | } |
| 225 | |
| 226 | static uint32_t PropertySetAsync(const std::string& name, const std::string& value, |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 227 | PropertyAsyncFunc func, std::string* error) { |
Tom Marshall | 6269690 | 2017-06-09 18:29:23 +0000 | [diff] [blame] | 228 | if (value.empty()) { |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 229 | return PropertySet(name, value, error); |
Tom Marshall | 6269690 | 2017-06-09 18:29:23 +0000 | [diff] [blame] | 230 | } |
| 231 | |
| 232 | PropertyChildInfo info; |
| 233 | info.func = func; |
| 234 | info.name = name; |
| 235 | info.value = value; |
| 236 | property_children.push(info); |
| 237 | if (property_children.size() == 1) { |
| 238 | PropertyChildLaunch(); |
| 239 | } |
| 240 | return PROP_SUCCESS; |
| 241 | } |
| 242 | |
| 243 | static int RestoreconRecursiveAsync(const std::string& name, const std::string& value) { |
| 244 | return selinux_android_restorecon(value.c_str(), SELINUX_ANDROID_RESTORECON_RECURSE); |
| 245 | } |
| 246 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 247 | uint32_t InitPropertySet(const std::string& name, const std::string& value) { |
| 248 | if (StartsWith(name, "ctl.")) { |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 249 | LOG(ERROR) << "InitPropertySet: Do not set ctl. properties from init; call the Service " |
| 250 | "functions directly"; |
| 251 | return PROP_ERROR_INVALID_NAME; |
| 252 | } |
| 253 | if (name == "selinux.restorecon_recursive") { |
| 254 | LOG(ERROR) << "InitPropertySet: Do not set selinux.restorecon_recursive from init; use the " |
| 255 | "restorecon builtin directly"; |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 256 | return PROP_ERROR_INVALID_NAME; |
| 257 | } |
| 258 | |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 259 | uint32_t result = 0; |
| 260 | ucred cr = {.pid = 1, .uid = 0, .gid = 0}; |
| 261 | std::string error; |
| 262 | result = HandlePropertySet(name, value, kInitContext.c_str(), cr, &error); |
| 263 | if (result != PROP_SUCCESS) { |
| 264 | LOG(ERROR) << "Init cannot set '" << name << "' to '" << value << "': " << error; |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 265 | } |
| 266 | |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 267 | return result; |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 268 | } |
| 269 | |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 270 | class SocketConnection { |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 271 | public: |
| 272 | SocketConnection(int socket, const ucred& cred) : socket_(socket), cred_(cred) {} |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 273 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 274 | ~SocketConnection() { close(socket_); } |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 275 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 276 | bool RecvUint32(uint32_t* value, uint32_t* timeout_ms) { |
| 277 | return RecvFully(value, sizeof(*value), timeout_ms); |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 278 | } |
| 279 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 280 | bool RecvChars(char* chars, size_t size, uint32_t* timeout_ms) { |
| 281 | return RecvFully(chars, size, timeout_ms); |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 282 | } |
| 283 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 284 | bool RecvString(std::string* value, uint32_t* timeout_ms) { |
| 285 | uint32_t len = 0; |
| 286 | if (!RecvUint32(&len, timeout_ms)) { |
| 287 | return false; |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 288 | } |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 289 | |
| 290 | if (len == 0) { |
| 291 | *value = ""; |
| 292 | return true; |
| 293 | } |
| 294 | |
| 295 | // http://b/35166374: don't allow init to make arbitrarily large allocations. |
| 296 | if (len > 0xffff) { |
| 297 | LOG(ERROR) << "sys_prop: RecvString asked to read huge string: " << len; |
| 298 | errno = ENOMEM; |
| 299 | return false; |
| 300 | } |
| 301 | |
| 302 | std::vector<char> chars(len); |
| 303 | if (!RecvChars(&chars[0], len, timeout_ms)) { |
| 304 | return false; |
| 305 | } |
| 306 | |
| 307 | *value = std::string(&chars[0], len); |
| 308 | return true; |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 309 | } |
| 310 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 311 | bool SendUint32(uint32_t value) { |
| 312 | int result = TEMP_FAILURE_RETRY(send(socket_, &value, sizeof(value), 0)); |
| 313 | return result == sizeof(value); |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 314 | } |
| 315 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 316 | int socket() { return socket_; } |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 317 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 318 | const ucred& cred() { return cred_; } |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 319 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 320 | std::string source_context() const { |
| 321 | char* source_context = nullptr; |
| 322 | getpeercon(socket_, &source_context); |
| 323 | std::string result = source_context; |
| 324 | freecon(source_context); |
| 325 | return result; |
| 326 | } |
| 327 | |
| 328 | private: |
| 329 | bool PollIn(uint32_t* timeout_ms) { |
| 330 | struct pollfd ufds[1]; |
| 331 | ufds[0].fd = socket_; |
| 332 | ufds[0].events = POLLIN; |
| 333 | ufds[0].revents = 0; |
| 334 | while (*timeout_ms > 0) { |
| 335 | auto start_time = std::chrono::steady_clock::now(); |
| 336 | int nr = poll(ufds, 1, *timeout_ms); |
| 337 | auto now = std::chrono::steady_clock::now(); |
| 338 | auto time_elapsed = |
| 339 | std::chrono::duration_cast<std::chrono::milliseconds>(now - start_time); |
| 340 | uint64_t millis = time_elapsed.count(); |
| 341 | *timeout_ms = (millis > *timeout_ms) ? 0 : *timeout_ms - millis; |
| 342 | |
| 343 | if (nr > 0) { |
| 344 | return true; |
| 345 | } |
| 346 | |
| 347 | if (nr == 0) { |
| 348 | // Timeout |
| 349 | break; |
| 350 | } |
| 351 | |
| 352 | if (nr < 0 && errno != EINTR) { |
| 353 | PLOG(ERROR) << "sys_prop: error waiting for uid " << cred_.uid |
| 354 | << " to send property message"; |
| 355 | return false; |
| 356 | } else { // errno == EINTR |
| 357 | // Timer rounds milliseconds down in case of EINTR we want it to be rounded up |
| 358 | // to avoid slowing init down by causing EINTR with under millisecond timeout. |
| 359 | if (*timeout_ms > 0) { |
| 360 | --(*timeout_ms); |
| 361 | } |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | LOG(ERROR) << "sys_prop: timeout waiting for uid " << cred_.uid |
| 366 | << " to send property message."; |
| 367 | return false; |
| 368 | } |
| 369 | |
| 370 | bool RecvFully(void* data_ptr, size_t size, uint32_t* timeout_ms) { |
| 371 | size_t bytes_left = size; |
| 372 | char* data = static_cast<char*>(data_ptr); |
| 373 | while (*timeout_ms > 0 && bytes_left > 0) { |
| 374 | if (!PollIn(timeout_ms)) { |
| 375 | return false; |
| 376 | } |
| 377 | |
| 378 | int result = TEMP_FAILURE_RETRY(recv(socket_, data, bytes_left, MSG_DONTWAIT)); |
| 379 | if (result <= 0) { |
DuXiao | 4053359 | 2018-05-21 14:43:56 +0800 | [diff] [blame] | 380 | PLOG(ERROR) << "sys_prop: recv error"; |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 381 | return false; |
| 382 | } |
| 383 | |
| 384 | bytes_left -= result; |
| 385 | data += result; |
| 386 | } |
| 387 | |
DuXiao | 4053359 | 2018-05-21 14:43:56 +0800 | [diff] [blame] | 388 | if (bytes_left != 0) { |
| 389 | LOG(ERROR) << "sys_prop: recv data is not properly obtained."; |
| 390 | } |
| 391 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 392 | return bytes_left == 0; |
| 393 | } |
| 394 | |
| 395 | int socket_; |
| 396 | ucred cred_; |
| 397 | |
| 398 | DISALLOW_IMPLICIT_CONSTRUCTORS(SocketConnection); |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 399 | }; |
| 400 | |
Tom Cherry | 5ab2e1c | 2018-05-03 16:57:19 -0700 | [diff] [blame^] | 401 | bool CheckControlPropertyPerms(const std::string& name, const std::string& value, |
| 402 | const std::string& source_context, const ucred& cr) { |
| 403 | // We check the legacy method first but these properties are dontaudit, so we only log an audit |
| 404 | // if the newer method fails as well. We only do this with the legacy ctl. properties. |
| 405 | if (name == "ctl.start" || name == "ctl.stop" || name == "ctl.restart") { |
| 406 | // The legacy permissions model is that ctl. properties have their name ctl.<action> and |
| 407 | // their value is the name of the service to apply that action to. Permissions for these |
| 408 | // actions are based on the service, so we must create a fake name of ctl.<service> to |
| 409 | // check permissions. |
| 410 | auto control_string_legacy = "ctl." + value; |
| 411 | const char* target_context_legacy = nullptr; |
| 412 | const char* type_legacy = nullptr; |
| 413 | property_info_area->GetPropertyInfo(control_string_legacy.c_str(), &target_context_legacy, |
| 414 | &type_legacy); |
| 415 | |
| 416 | if (CheckMacPerms(control_string_legacy, target_context_legacy, source_context.c_str(), cr)) { |
| 417 | return true; |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | auto control_string_full = name + "$" + value; |
| 422 | const char* target_context_full = nullptr; |
| 423 | const char* type_full = nullptr; |
| 424 | property_info_area->GetPropertyInfo(control_string_full.c_str(), &target_context_full, |
| 425 | &type_full); |
| 426 | |
| 427 | return CheckMacPerms(control_string_full, target_context_full, source_context.c_str(), cr); |
| 428 | } |
| 429 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 430 | // This returns one of the enum of PROP_SUCCESS or PROP_ERROR*. |
| 431 | uint32_t HandlePropertySet(const std::string& name, const std::string& value, |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 432 | const std::string& source_context, const ucred& cr, std::string* error) { |
Tom Cherry | de6bd50 | 2018-02-13 16:50:08 -0800 | [diff] [blame] | 433 | if (!IsLegalPropertyName(name)) { |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 434 | *error = "Illegal property name"; |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 435 | return PROP_ERROR_INVALID_NAME; |
| 436 | } |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 437 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 438 | if (StartsWith(name, "ctl.")) { |
Tom Cherry | 5ab2e1c | 2018-05-03 16:57:19 -0700 | [diff] [blame^] | 439 | if (!CheckControlPropertyPerms(name, value, source_context, cr)) { |
| 440 | *error = StringPrintf("Invalid permissions to perform '%s' on '%s'", name.c_str() + 4, |
| 441 | value.c_str()); |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 442 | return PROP_ERROR_HANDLE_CONTROL_MESSAGE; |
| 443 | } |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 444 | |
Tom Cherry | 6f2d56d | 2018-02-21 10:37:44 -0800 | [diff] [blame] | 445 | HandleControlMessage(name.c_str() + 4, value, cr.pid); |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 446 | return PROP_SUCCESS; |
| 447 | } |
Tom Cherry | 927c5d5 | 2017-12-11 01:40:07 -0800 | [diff] [blame] | 448 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 449 | const char* target_context = nullptr; |
| 450 | const char* type = nullptr; |
| 451 | property_info_area->GetPropertyInfo(name.c_str(), &target_context, &type); |
Tom Cherry | a84e14d | 2017-09-05 12:38:30 -0700 | [diff] [blame] | 452 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 453 | if (!CheckMacPerms(name, target_context, source_context.c_str(), cr)) { |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 454 | *error = "SELinux permission check failed"; |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 455 | return PROP_ERROR_PERMISSION_DENIED; |
| 456 | } |
| 457 | |
| 458 | if (type == nullptr || !CheckType(type, value)) { |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 459 | *error = StringPrintf("Property type check failed, value doesn't match expected type '%s'", |
| 460 | (type ?: "(null)")); |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 461 | return PROP_ERROR_INVALID_VALUE; |
| 462 | } |
| 463 | |
| 464 | // sys.powerctl is a special property that is used to make the device reboot. We want to log |
| 465 | // any process that sets this property to be able to accurately blame the cause of a shutdown. |
| 466 | if (name == "sys.powerctl") { |
| 467 | std::string cmdline_path = StringPrintf("proc/%d/cmdline", cr.pid); |
| 468 | std::string process_cmdline; |
| 469 | std::string process_log_string; |
| 470 | if (ReadFileToString(cmdline_path, &process_cmdline)) { |
| 471 | // Since cmdline is null deliminated, .c_str() conveniently gives us just the process |
| 472 | // path. |
| 473 | process_log_string = StringPrintf(" (%s)", process_cmdline.c_str()); |
| 474 | } |
| 475 | LOG(INFO) << "Received sys.powerctl='" << value << "' from pid: " << cr.pid |
| 476 | << process_log_string; |
| 477 | } |
| 478 | |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 479 | if (name == "selinux.restorecon_recursive") { |
| 480 | return PropertySetAsync(name, value, RestoreconRecursiveAsync, error); |
| 481 | } |
| 482 | |
| 483 | return PropertySet(name, value, error); |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 484 | } |
| 485 | |
| 486 | static void handle_property_set_fd() { |
| 487 | static constexpr uint32_t kDefaultSocketTimeout = 2000; /* ms */ |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 488 | |
Robert Sesek | ca2da60 | 2017-01-25 08:08:51 -0500 | [diff] [blame] | 489 | int s = accept4(property_set_fd, nullptr, nullptr, SOCK_CLOEXEC); |
Elliott Hughes | 3dcfa3f | 2016-08-23 12:50:00 -0700 | [diff] [blame] | 490 | if (s == -1) { |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 491 | return; |
| 492 | } |
| 493 | |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 494 | ucred cr; |
Elliott Hughes | 3dcfa3f | 2016-08-23 12:50:00 -0700 | [diff] [blame] | 495 | socklen_t cr_size = sizeof(cr); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 496 | if (getsockopt(s, SOL_SOCKET, SO_PEERCRED, &cr, &cr_size) < 0) { |
| 497 | close(s); |
Elliott Hughes | b005d90 | 2017-02-22 14:54:15 -0800 | [diff] [blame] | 498 | PLOG(ERROR) << "sys_prop: unable to get SO_PEERCRED"; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 499 | return; |
| 500 | } |
| 501 | |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 502 | SocketConnection socket(s, cr); |
| 503 | uint32_t timeout_ms = kDefaultSocketTimeout; |
| 504 | |
| 505 | uint32_t cmd = 0; |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 506 | if (!socket.RecvUint32(&cmd, &timeout_ms)) { |
| 507 | PLOG(ERROR) << "sys_prop: error while reading command from the socket"; |
| 508 | socket.SendUint32(PROP_ERROR_READ_CMD); |
JP Abgrall | 4515d81 | 2014-01-31 14:37:07 -0800 | [diff] [blame] | 509 | return; |
| 510 | } |
| 511 | |
Elliott Hughes | b005d90 | 2017-02-22 14:54:15 -0800 | [diff] [blame] | 512 | switch (cmd) { |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 513 | case PROP_MSG_SETPROP: { |
| 514 | char prop_name[PROP_NAME_MAX]; |
| 515 | char prop_value[PROP_VALUE_MAX]; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 516 | |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 517 | if (!socket.RecvChars(prop_name, PROP_NAME_MAX, &timeout_ms) || |
| 518 | !socket.RecvChars(prop_value, PROP_VALUE_MAX, &timeout_ms)) { |
| 519 | PLOG(ERROR) << "sys_prop(PROP_MSG_SETPROP): error while reading name/value from the socket"; |
| 520 | return; |
Nick Kralevich | 6946361 | 2013-09-13 17:21:28 -0700 | [diff] [blame] | 521 | } |
| 522 | |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 523 | prop_name[PROP_NAME_MAX-1] = 0; |
| 524 | prop_value[PROP_VALUE_MAX-1] = 0; |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 525 | |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 526 | const auto& cr = socket.cred(); |
| 527 | std::string error; |
| 528 | uint32_t result = |
| 529 | HandlePropertySet(prop_name, prop_value, socket.source_context(), cr, &error); |
| 530 | if (result != PROP_SUCCESS) { |
| 531 | LOG(ERROR) << "Unable to set property '" << prop_name << "' to '" << prop_value |
| 532 | << "' from uid:" << cr.uid << " gid:" << cr.gid << " pid:" << cr.pid << ": " |
| 533 | << error; |
| 534 | } |
| 535 | |
Dimitry Ivanov | dee4bd2 | 2017-01-19 14:53:00 -0800 | [diff] [blame] | 536 | break; |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 537 | } |
Dimitry Ivanov | 70c4ecf | 2017-01-24 18:38:09 +0000 | [diff] [blame] | 538 | |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 539 | case PROP_MSG_SETPROP2: { |
| 540 | std::string name; |
| 541 | std::string value; |
| 542 | if (!socket.RecvString(&name, &timeout_ms) || |
| 543 | !socket.RecvString(&value, &timeout_ms)) { |
| 544 | PLOG(ERROR) << "sys_prop(PROP_MSG_SETPROP2): error while reading name/value from the socket"; |
| 545 | socket.SendUint32(PROP_ERROR_READ_DATA); |
| 546 | return; |
| 547 | } |
| 548 | |
Tom Cherry | 69d47aa | 2018-03-01 11:00:57 -0800 | [diff] [blame] | 549 | const auto& cr = socket.cred(); |
| 550 | std::string error; |
| 551 | uint32_t result = HandlePropertySet(name, value, socket.source_context(), cr, &error); |
| 552 | if (result != PROP_SUCCESS) { |
| 553 | LOG(ERROR) << "Unable to set property '" << name << "' to '" << value |
| 554 | << "' from uid:" << cr.uid << " gid:" << cr.gid << " pid:" << cr.pid << ": " |
| 555 | << error; |
| 556 | } |
Tom Cherry | 3222848 | 2018-01-18 16:14:25 -0800 | [diff] [blame] | 557 | socket.SendUint32(result); |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 558 | break; |
| 559 | } |
Elliott Hughes | b005d90 | 2017-02-22 14:54:15 -0800 | [diff] [blame] | 560 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 561 | default: |
Elliott Hughes | b005d90 | 2017-02-22 14:54:15 -0800 | [diff] [blame] | 562 | LOG(ERROR) << "sys_prop: invalid command " << cmd; |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 563 | socket.SendUint32(PROP_ERROR_INVALID_CMD); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 564 | break; |
| 565 | } |
| 566 | } |
| 567 | |
Hung-ying Tyan | aef2b09 | 2017-06-02 18:59:46 +0800 | [diff] [blame] | 568 | static bool load_properties_from_file(const char *, const char *); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 569 | |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 570 | /* |
| 571 | * Filter is used to decide which properties to load: NULL loads all keys, |
| 572 | * "ro.foo.*" is a prefix match, and "ro.foo.bar" is an exact match. |
| 573 | */ |
Tom Cherry | dc37586 | 2018-02-28 10:39:01 -0800 | [diff] [blame] | 574 | static void LoadProperties(char* data, const char* filter, const char* filename) { |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 575 | char *key, *value, *eol, *sol, *tmp, *fn; |
| 576 | size_t flen = 0; |
| 577 | |
Tom Cherry | dc37586 | 2018-02-28 10:39:01 -0800 | [diff] [blame] | 578 | const char* context = kInitContext.c_str(); |
Logan Chien | 837b2a4 | 2018-05-03 14:33:52 +0800 | [diff] [blame] | 579 | if (SelinuxHasVendorInit()) { |
Tom Cherry | a1dbeb8 | 2018-04-11 15:50:00 -0700 | [diff] [blame] | 580 | for (const auto& [path_prefix, secontext] : paths_and_secontexts) { |
| 581 | if (StartsWith(filename, path_prefix)) { |
| 582 | context = secontext; |
| 583 | } |
Tom Cherry | dc37586 | 2018-02-28 10:39:01 -0800 | [diff] [blame] | 584 | } |
| 585 | } |
| 586 | |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 587 | if (filter) { |
| 588 | flen = strlen(filter); |
| 589 | } |
| 590 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 591 | sol = data; |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 592 | while ((eol = strchr(sol, '\n'))) { |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 593 | key = sol; |
| 594 | *eol++ = 0; |
| 595 | sol = eol; |
| 596 | |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 597 | while (isspace(*key)) key++; |
| 598 | if (*key == '#') continue; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 599 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 600 | tmp = eol - 2; |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 601 | while ((tmp > key) && isspace(*tmp)) *tmp-- = 0; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 602 | |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 603 | if (!strncmp(key, "import ", 7) && flen == 0) { |
| 604 | fn = key + 7; |
| 605 | while (isspace(*fn)) fn++; |
| 606 | |
| 607 | key = strchr(fn, ' '); |
| 608 | if (key) { |
| 609 | *key++ = 0; |
| 610 | while (isspace(*key)) key++; |
| 611 | } |
| 612 | |
| 613 | load_properties_from_file(fn, key); |
| 614 | |
| 615 | } else { |
| 616 | value = strchr(key, '='); |
| 617 | if (!value) continue; |
| 618 | *value++ = 0; |
| 619 | |
| 620 | tmp = value - 2; |
| 621 | while ((tmp > key) && isspace(*tmp)) *tmp-- = 0; |
| 622 | |
| 623 | while (isspace(*value)) value++; |
| 624 | |
| 625 | if (flen > 0) { |
| 626 | if (filter[flen - 1] == '*') { |
| 627 | if (strncmp(key, filter, flen - 1)) continue; |
| 628 | } else { |
| 629 | if (strcmp(key, filter)) continue; |
| 630 | } |
| 631 | } |
| 632 | |
Tom Cherry | dc37586 | 2018-02-28 10:39:01 -0800 | [diff] [blame] | 633 | if (StartsWith(key, "ctl.") || key == "sys.powerctl"s || |
| 634 | key == "selinux.restorecon_recursive"s) { |
| 635 | LOG(ERROR) << "Ignoring disallowed property '" << key |
| 636 | << "' with special meaning in prop file '" << filename << "'"; |
| 637 | continue; |
| 638 | } |
| 639 | |
| 640 | uint32_t result = 0; |
| 641 | ucred cr = {.pid = 1, .uid = 0, .gid = 0}; |
| 642 | std::string error; |
| 643 | result = HandlePropertySet(key, value, context, cr, &error); |
| 644 | if (result != PROP_SUCCESS) { |
| 645 | LOG(ERROR) << "Unable to set property '" << key << "' to '" << value |
| 646 | << "' in property file '" << filename << "': " << error; |
| 647 | } |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 648 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 649 | } |
| 650 | } |
| 651 | |
Elliott Hughes | 5a7ad84 | 2016-09-30 14:12:33 -0700 | [diff] [blame] | 652 | // Filter is used to decide which properties to load: NULL loads all keys, |
| 653 | // "ro.foo.*" is a prefix match, and "ro.foo.bar" is an exact match. |
Hung-ying Tyan | aef2b09 | 2017-06-02 18:59:46 +0800 | [diff] [blame] | 654 | static bool load_properties_from_file(const char* filename, const char* filter) { |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 655 | Timer t; |
Tom Cherry | 62ca663 | 2017-08-03 12:54:07 -0700 | [diff] [blame] | 656 | auto file_contents = ReadFile(filename); |
| 657 | if (!file_contents) { |
| 658 | PLOG(WARNING) << "Couldn't load property file '" << filename |
| 659 | << "': " << file_contents.error(); |
Hung-ying Tyan | aef2b09 | 2017-06-02 18:59:46 +0800 | [diff] [blame] | 660 | return false; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 661 | } |
Tom Cherry | 62ca663 | 2017-08-03 12:54:07 -0700 | [diff] [blame] | 662 | file_contents->push_back('\n'); |
Tom Cherry | dc37586 | 2018-02-28 10:39:01 -0800 | [diff] [blame] | 663 | |
| 664 | LoadProperties(file_contents->data(), filter, filename); |
Elliott Hughes | 331cf2f | 2016-11-29 19:20:58 +0000 | [diff] [blame] | 665 | LOG(VERBOSE) << "(Loading properties from " << filename << " took " << t << ".)"; |
Hung-ying Tyan | aef2b09 | 2017-06-02 18:59:46 +0800 | [diff] [blame] | 666 | return true; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 667 | } |
| 668 | |
Jaekyun Seok | 0cf3a07 | 2017-04-24 18:52:54 +0900 | [diff] [blame] | 669 | // persist.sys.usb.config values can't be combined on build-time when property |
| 670 | // files are split into each partition. |
| 671 | // So we need to apply the same rule of build/make/tools/post_process_props.py |
| 672 | // on runtime. |
| 673 | static void update_sys_usb_config() { |
| 674 | bool is_debuggable = android::base::GetBoolProperty("ro.debuggable", false); |
| 675 | std::string config = android::base::GetProperty("persist.sys.usb.config", ""); |
| 676 | if (config.empty()) { |
| 677 | property_set("persist.sys.usb.config", is_debuggable ? "adb" : "none"); |
| 678 | } else if (is_debuggable && config.find("adb") == std::string::npos && |
| 679 | config.length() + 4 < PROP_VALUE_MAX) { |
| 680 | config.append(",adb"); |
| 681 | property_set("persist.sys.usb.config", config); |
| 682 | } |
| 683 | } |
| 684 | |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 685 | void property_load_boot_defaults() { |
Hung-ying Tyan | aef2b09 | 2017-06-02 18:59:46 +0800 | [diff] [blame] | 686 | if (!load_properties_from_file("/system/etc/prop.default", NULL)) { |
| 687 | // Try recovery path |
| 688 | if (!load_properties_from_file("/prop.default", NULL)) { |
| 689 | // Try legacy path |
| 690 | load_properties_from_file("/default.prop", NULL); |
| 691 | } |
| 692 | } |
Jaekyun Seok | dff165d | 2017-11-28 12:10:10 +0900 | [diff] [blame] | 693 | load_properties_from_file("/product/build.prop", NULL); |
Hung-ying Tyan | 3346338 | 2017-05-25 19:18:17 +0800 | [diff] [blame] | 694 | load_properties_from_file("/odm/default.prop", NULL); |
| 695 | load_properties_from_file("/vendor/default.prop", NULL); |
Jaekyun Seok | 0cf3a07 | 2017-04-24 18:52:54 +0900 | [diff] [blame] | 696 | |
| 697 | update_sys_usb_config(); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 698 | } |
| 699 | |
Nick Kralevich | 32b9023 | 2012-09-19 11:15:24 -0700 | [diff] [blame] | 700 | static void load_override_properties() { |
Elliott Hughes | c0e919c | 2015-02-04 14:46:36 -0800 | [diff] [blame] | 701 | if (ALLOW_LOCAL_PROP_OVERRIDE) { |
Hung-ying Tyan | 3346338 | 2017-05-25 19:18:17 +0800 | [diff] [blame] | 702 | load_properties_from_file("/data/local.prop", NULL); |
Nick Kralevich | 32b9023 | 2012-09-19 11:15:24 -0700 | [diff] [blame] | 703 | } |
Nick Kralevich | 32b9023 | 2012-09-19 11:15:24 -0700 | [diff] [blame] | 704 | } |
| 705 | |
Ken Sumrall | c5c5103 | 2011-03-08 17:01:29 -0800 | [diff] [blame] | 706 | /* When booting an encrypted system, /data is not mounted when the |
| 707 | * property service is started, so any properties stored there are |
| 708 | * not loaded. Vold triggers init to load these properties once it |
| 709 | * has mounted /data. |
| 710 | */ |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 711 | void load_persist_props(void) { |
Tom Cherry | 9951b79 | 2017-08-24 14:01:25 -0700 | [diff] [blame] | 712 | // Devices with FDE have load_persist_props called twice; the first time when the temporary |
| 713 | // /data partition is mounted and then again once /data is truly mounted. We do not want to |
| 714 | // read persistent properties from the temporary /data partition or mark persistent properties |
| 715 | // as having been loaded during the first call, so we return in that case. |
| 716 | std::string crypto_state = android::base::GetProperty("ro.crypto.state", ""); |
| 717 | std::string crypto_type = android::base::GetProperty("ro.crypto.type", ""); |
| 718 | if (crypto_state == "encrypted" && crypto_type == "block") { |
| 719 | static size_t num_calls = 0; |
| 720 | if (++num_calls == 1) return; |
| 721 | } |
| 722 | |
Nick Kralevich | 32b9023 | 2012-09-19 11:15:24 -0700 | [diff] [blame] | 723 | load_override_properties(); |
Ken Sumrall | c5c5103 | 2011-03-08 17:01:29 -0800 | [diff] [blame] | 724 | /* Read persistent properties after all default values have been loaded. */ |
Tom Cherry | 16fad42 | 2017-08-04 15:59:03 -0700 | [diff] [blame] | 725 | auto persistent_properties = LoadPersistentProperties(); |
Tom Cherry | a97faba | 2017-09-15 15:44:04 -0700 | [diff] [blame] | 726 | for (const auto& persistent_property_record : persistent_properties.properties()) { |
| 727 | property_set(persistent_property_record.name(), persistent_property_record.value()); |
Tom Cherry | 16fad42 | 2017-08-04 15:59:03 -0700 | [diff] [blame] | 728 | } |
| 729 | persistent_properties_loaded = true; |
Keun-young Park | 404906d | 2017-02-28 19:20:38 -0800 | [diff] [blame] | 730 | property_set("ro.persistent_properties.ready", "true"); |
Ken Sumrall | c5c5103 | 2011-03-08 17:01:29 -0800 | [diff] [blame] | 731 | } |
| 732 | |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 733 | void load_recovery_id_prop() { |
Bowgo Tsai | c9a1842 | 2017-03-09 22:36:34 +0800 | [diff] [blame] | 734 | std::unique_ptr<fstab, decltype(&fs_mgr_free_fstab)> fstab(fs_mgr_read_fstab_default(), |
| 735 | fs_mgr_free_fstab); |
| 736 | if (!fstab) { |
| 737 | PLOG(ERROR) << "unable to read default fstab"; |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 738 | return; |
| 739 | } |
| 740 | |
Bowgo Tsai | c9a1842 | 2017-03-09 22:36:34 +0800 | [diff] [blame] | 741 | fstab_rec* rec = fs_mgr_get_entry_for_mount_point(fstab.get(), RECOVERY_MOUNT_POINT); |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 742 | if (rec == NULL) { |
Elliott Hughes | f86b5a6 | 2016-06-24 15:12:21 -0700 | [diff] [blame] | 743 | LOG(ERROR) << "/recovery not specified in fstab"; |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 744 | return; |
| 745 | } |
| 746 | |
| 747 | int fd = open(rec->blk_device, O_RDONLY); |
| 748 | if (fd == -1) { |
Elliott Hughes | f86b5a6 | 2016-06-24 15:12:21 -0700 | [diff] [blame] | 749 | PLOG(ERROR) << "error opening block device " << rec->blk_device; |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 750 | return; |
| 751 | } |
| 752 | |
| 753 | boot_img_hdr hdr; |
| 754 | if (android::base::ReadFully(fd, &hdr, sizeof(hdr))) { |
| 755 | std::string hex = bytes_to_hex(reinterpret_cast<uint8_t*>(hdr.id), sizeof(hdr.id)); |
Tom Cherry | 1c3a53f | 2017-06-22 16:50:31 -0700 | [diff] [blame] | 756 | property_set("ro.recovery_id", hex); |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 757 | } else { |
Elliott Hughes | f86b5a6 | 2016-06-24 15:12:21 -0700 | [diff] [blame] | 758 | PLOG(ERROR) << "error reading /recovery"; |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 759 | } |
| 760 | |
| 761 | close(fd); |
| 762 | } |
| 763 | |
Paul Lawrence | 948410a | 2015-07-01 14:40:56 -0700 | [diff] [blame] | 764 | void load_system_props() { |
Hung-ying Tyan | 3346338 | 2017-05-25 19:18:17 +0800 | [diff] [blame] | 765 | load_properties_from_file("/system/build.prop", NULL); |
| 766 | load_properties_from_file("/odm/build.prop", NULL); |
| 767 | load_properties_from_file("/vendor/build.prop", NULL); |
Elliott Hughes | 795798d | 2017-01-27 16:21:55 -0800 | [diff] [blame] | 768 | load_properties_from_file("/factory/factory.prop", "ro.*"); |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 769 | load_recovery_id_prop(); |
Riley Andrews | e4b7b29 | 2014-06-16 15:06:21 -0700 | [diff] [blame] | 770 | } |
| 771 | |
Tom Cherry | c3692b3 | 2017-08-10 12:22:44 -0700 | [diff] [blame] | 772 | static int SelinuxAuditCallback(void* data, security_class_t /*cls*/, char* buf, size_t len) { |
Tom Cherry | 5ab2e1c | 2018-05-03 16:57:19 -0700 | [diff] [blame^] | 773 | auto* d = reinterpret_cast<PropertyAuditData*>(data); |
Tom Cherry | c3692b3 | 2017-08-10 12:22:44 -0700 | [diff] [blame] | 774 | |
| 775 | if (!d || !d->name || !d->cr) { |
| 776 | LOG(ERROR) << "AuditCallback invoked with null data arguments!"; |
| 777 | return 0; |
| 778 | } |
| 779 | |
| 780 | snprintf(buf, len, "property=%s pid=%d uid=%d gid=%d", d->name, d->cr->pid, d->cr->uid, |
| 781 | d->cr->gid); |
| 782 | return 0; |
| 783 | } |
| 784 | |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 785 | bool LoadPropertyInfoFromFile(const std::string& filename, |
| 786 | std::vector<PropertyInfoEntry>* property_infos) { |
| 787 | auto file_contents = std::string(); |
| 788 | if (!ReadFileToString(filename, &file_contents)) { |
| 789 | PLOG(ERROR) << "Could not read properties from '" << filename << "'"; |
| 790 | return false; |
| 791 | } |
| 792 | |
Tom Cherry | 919458c | 2018-01-03 14:39:28 -0800 | [diff] [blame] | 793 | auto errors = std::vector<std::string>{}; |
| 794 | ParsePropertyInfoFile(file_contents, property_infos, &errors); |
| 795 | // Individual parsing errors are reported but do not cause a failed boot, which is what |
| 796 | // returning false would do here. |
| 797 | for (const auto& error : errors) { |
| 798 | LOG(ERROR) << "Could not read line from '" << filename << "': " << error; |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 799 | } |
Tom Cherry | 919458c | 2018-01-03 14:39:28 -0800 | [diff] [blame] | 800 | |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 801 | return true; |
| 802 | } |
| 803 | |
| 804 | void CreateSerializedPropertyInfo() { |
| 805 | auto property_infos = std::vector<PropertyInfoEntry>(); |
| 806 | if (access("/system/etc/selinux/plat_property_contexts", R_OK) != -1) { |
| 807 | if (!LoadPropertyInfoFromFile("/system/etc/selinux/plat_property_contexts", |
| 808 | &property_infos)) { |
| 809 | return; |
| 810 | } |
| 811 | // Don't check for failure here, so we always have a sane list of properties. |
| 812 | // E.g. In case of recovery, the vendor partition will not have mounted and we |
| 813 | // still need the system / platform properties to function. |
Bowgo Tsai | 36cf353 | 2017-12-07 16:05:25 +0800 | [diff] [blame] | 814 | if (!LoadPropertyInfoFromFile("/vendor/etc/selinux/vendor_property_contexts", |
| 815 | &property_infos)) { |
| 816 | // Fallback to nonplat_* if vendor_* doesn't exist. |
| 817 | LoadPropertyInfoFromFile("/vendor/etc/selinux/nonplat_property_contexts", |
| 818 | &property_infos); |
| 819 | } |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 820 | } else { |
| 821 | if (!LoadPropertyInfoFromFile("/plat_property_contexts", &property_infos)) { |
| 822 | return; |
| 823 | } |
Bowgo Tsai | 36cf353 | 2017-12-07 16:05:25 +0800 | [diff] [blame] | 824 | if (!LoadPropertyInfoFromFile("/vendor_property_contexts", &property_infos)) { |
| 825 | // Fallback to nonplat_* if vendor_* doesn't exist. |
| 826 | LoadPropertyInfoFromFile("/nonplat_property_contexts", &property_infos); |
| 827 | } |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 828 | } |
Tom Cherry | 927c5d5 | 2017-12-11 01:40:07 -0800 | [diff] [blame] | 829 | |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 830 | auto serialized_contexts = std::string(); |
| 831 | auto error = std::string(); |
Tom Cherry | 927c5d5 | 2017-12-11 01:40:07 -0800 | [diff] [blame] | 832 | if (!BuildTrie(property_infos, "u:object_r:default_prop:s0", "string", &serialized_contexts, |
Tom Cherry | 2ae2f60 | 2017-12-14 01:58:17 +0000 | [diff] [blame] | 833 | &error)) { |
| 834 | LOG(ERROR) << "Unable to serialize property contexts: " << error; |
| 835 | return; |
| 836 | } |
| 837 | |
| 838 | constexpr static const char kPropertyInfosPath[] = "/dev/__properties__/property_info"; |
| 839 | if (!WriteStringToFile(serialized_contexts, kPropertyInfosPath, 0444, 0, 0, false)) { |
| 840 | PLOG(ERROR) << "Unable to write serialized property infos to file"; |
| 841 | } |
| 842 | selinux_android_restorecon(kPropertyInfosPath, 0); |
| 843 | } |
| 844 | |
Mark Salyzyn | 6c6ec72 | 2015-10-24 16:20:18 -0700 | [diff] [blame] | 845 | void StartPropertyService(Epoll* epoll) { |
Tom Cherry | c3692b3 | 2017-08-10 12:22:44 -0700 | [diff] [blame] | 846 | selinux_callback cb; |
| 847 | cb.func_audit = SelinuxAuditCallback; |
| 848 | selinux_set_callback(SELINUX_CB_AUDIT, cb); |
| 849 | |
Dimitry Ivanov | c9bb033 | 2017-01-24 20:43:58 +0000 | [diff] [blame] | 850 | property_set("ro.property_service.version", "2"); |
| 851 | |
Mark Salyzyn | b066fcc | 2017-05-05 14:44:35 -0700 | [diff] [blame] | 852 | property_set_fd = CreateSocket(PROP_SERVICE_NAME, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, |
Tom Cherry | c3692b3 | 2017-08-10 12:22:44 -0700 | [diff] [blame] | 853 | false, 0666, 0, 0, nullptr); |
Elliott Hughes | c6c26ed | 2015-04-24 18:50:30 -0700 | [diff] [blame] | 854 | if (property_set_fd == -1) { |
Tom Cherry | 4a67945 | 2017-09-26 16:30:03 -0700 | [diff] [blame] | 855 | PLOG(FATAL) << "start_property_service socket creation failed"; |
Elliott Hughes | c6c26ed | 2015-04-24 18:50:30 -0700 | [diff] [blame] | 856 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 857 | |
Elliott Hughes | c6c26ed | 2015-04-24 18:50:30 -0700 | [diff] [blame] | 858 | listen(property_set_fd, 8); |
Colin Cross | d11beb2 | 2010-04-13 19:33:37 -0700 | [diff] [blame] | 859 | |
Mark Salyzyn | 6c6ec72 | 2015-10-24 16:20:18 -0700 | [diff] [blame] | 860 | if (auto result = epoll->RegisterHandler(property_set_fd, handle_property_set_fd); !result) { |
| 861 | PLOG(FATAL) << result.error(); |
| 862 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 863 | } |
Tom Cherry | 81f5d3e | 2017-06-22 12:53:17 -0700 | [diff] [blame] | 864 | |
| 865 | } // namespace init |
| 866 | } // namespace android |