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 | |
| 17 | #include <stdio.h> |
| 18 | #include <stdlib.h> |
| 19 | #include <unistd.h> |
| 20 | #include <string.h> |
| 21 | #include <ctype.h> |
| 22 | #include <fcntl.h> |
| 23 | #include <stdarg.h> |
| 24 | #include <dirent.h> |
| 25 | #include <limits.h> |
| 26 | #include <errno.h> |
JP Abgrall | 4515d81 | 2014-01-31 14:37:07 -0800 | [diff] [blame] | 27 | #include <sys/poll.h> |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 28 | |
Elliott Hughes | 81399e1 | 2015-03-10 08:39:45 -0700 | [diff] [blame] | 29 | #include <memory> |
| 30 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 31 | #include <cutils/misc.h> |
| 32 | #include <cutils/sockets.h> |
Matthew Xie | 40a91a2 | 2013-05-20 14:22:01 -0700 | [diff] [blame] | 33 | #include <cutils/multiuser.h> |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 34 | |
| 35 | #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ |
| 36 | #include <sys/_system_properties.h> |
| 37 | |
| 38 | #include <sys/socket.h> |
| 39 | #include <sys/un.h> |
| 40 | #include <sys/select.h> |
| 41 | #include <sys/types.h> |
| 42 | #include <netinet/in.h> |
| 43 | #include <sys/mman.h> |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 44 | #include <private/android_filesystem_config.h> |
| 45 | |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 46 | #include <selinux/selinux.h> |
| 47 | #include <selinux/label.h> |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 48 | |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 49 | #include <fs_mgr.h> |
Elliott Hughes | 4f71319 | 2015-12-04 22:00:26 -0800 | [diff] [blame] | 50 | #include <android-base/file.h> |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 51 | #include "bootimg.h" |
| 52 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 53 | #include "property_service.h" |
| 54 | #include "init.h" |
Colin Cross | 3899e9f | 2010-04-13 20:35:46 -0700 | [diff] [blame] | 55 | #include "util.h" |
Colin Cross | ed8a7d8 | 2010-04-19 17:05:34 -0700 | [diff] [blame] | 56 | #include "log.h" |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 57 | |
| 58 | #define PERSISTENT_PROPERTY_DIR "/data/property" |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 59 | #define FSTAB_PREFIX "/fstab." |
| 60 | #define RECOVERY_MOUNT_POINT "/recovery" |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 61 | |
| 62 | static int persistent_properties_loaded = 0; |
| 63 | |
Colin Cross | d11beb2 | 2010-04-13 19:33:37 -0700 | [diff] [blame] | 64 | static int property_set_fd = -1; |
| 65 | |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 66 | void property_init() { |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 67 | if (__system_property_area_init()) { |
Tom Cherry | 6036114 | 2015-12-01 17:16:53 -0800 | [diff] [blame] | 68 | ERROR("Failed to initialize property area\n"); |
| 69 | exit(1); |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 70 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 71 | } |
| 72 | |
William Roberts | d7aea44 | 2015-10-01 16:03:47 -0700 | [diff] [blame] | 73 | static int check_mac_perms(const char *name, char *sctx, struct ucred *cr) |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 74 | { |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 75 | char *tctx = NULL; |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 76 | int result = 0; |
William Roberts | d7aea44 | 2015-10-01 16:03:47 -0700 | [diff] [blame] | 77 | property_audit_data audit_data; |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 78 | |
| 79 | if (!sctx) |
| 80 | goto err; |
| 81 | |
| 82 | if (!sehandle_prop) |
| 83 | goto err; |
| 84 | |
| 85 | if (selabel_lookup(sehandle_prop, &tctx, name, 1) != 0) |
| 86 | goto err; |
| 87 | |
William Roberts | d7aea44 | 2015-10-01 16:03:47 -0700 | [diff] [blame] | 88 | audit_data.name = name; |
| 89 | audit_data.cr = cr; |
| 90 | |
| 91 | if (selinux_check_access(sctx, tctx, "property_service", "set", reinterpret_cast<void*>(&audit_data)) == 0) |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 92 | result = 1; |
| 93 | |
| 94 | freecon(tctx); |
| 95 | err: |
| 96 | return result; |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 97 | } |
| 98 | |
William Roberts | d7aea44 | 2015-10-01 16:03:47 -0700 | [diff] [blame] | 99 | static int check_control_mac_perms(const char *name, char *sctx, struct ucred *cr) |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 100 | { |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 101 | /* |
| 102 | * Create a name prefix out of ctl.<service name> |
| 103 | * The new prefix allows the use of the existing |
| 104 | * property service backend labeling while avoiding |
| 105 | * mislabels based on true property prefixes. |
| 106 | */ |
| 107 | char ctl_name[PROP_VALUE_MAX+4]; |
| 108 | int ret = snprintf(ctl_name, sizeof(ctl_name), "ctl.%s", name); |
| 109 | |
| 110 | if (ret < 0 || (size_t) ret >= sizeof(ctl_name)) |
| 111 | return 0; |
| 112 | |
William Roberts | d7aea44 | 2015-10-01 16:03:47 -0700 | [diff] [blame] | 113 | return check_mac_perms(ctl_name, sctx, cr); |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 114 | } |
| 115 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 116 | /* |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 117 | * Checks permissions for setting system properties. |
| 118 | * Returns 1 if uid allowed, 0 otherwise. |
| 119 | */ |
William Roberts | d7aea44 | 2015-10-01 16:03:47 -0700 | [diff] [blame] | 120 | static int check_perms(const char *name, char *sctx, struct ucred *cr) |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 121 | { |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 122 | if(!strncmp(name, "ro.", 3)) |
| 123 | name +=3; |
| 124 | |
William Roberts | d7aea44 | 2015-10-01 16:03:47 -0700 | [diff] [blame] | 125 | return check_mac_perms(name, sctx, cr); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 126 | } |
| 127 | |
Yabin Cui | 74edcea | 2015-07-24 10:11:05 -0700 | [diff] [blame] | 128 | std::string property_get(const char* name) { |
| 129 | char value[PROP_VALUE_MAX] = {0}; |
| 130 | __system_property_get(name, value); |
| 131 | return value; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 132 | } |
| 133 | |
Tammo Spalink | 3dfe6c6 | 2009-08-26 10:13:20 +0800 | [diff] [blame] | 134 | static void write_persistent_property(const char *name, const char *value) |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 135 | { |
Nick Kralevich | 7ecfe6a | 2012-10-02 14:59:59 -0700 | [diff] [blame] | 136 | char tempPath[PATH_MAX]; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 137 | char path[PATH_MAX]; |
Nick Kralevich | 7ecfe6a | 2012-10-02 14:59:59 -0700 | [diff] [blame] | 138 | int fd; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 139 | |
Nick Kralevich | 7ecfe6a | 2012-10-02 14:59:59 -0700 | [diff] [blame] | 140 | snprintf(tempPath, sizeof(tempPath), "%s/.temp.XXXXXX", PERSISTENT_PROPERTY_DIR); |
| 141 | fd = mkstemp(tempPath); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 142 | if (fd < 0) { |
Elliott Hughes | cd67f00 | 2015-03-20 17:05:56 -0700 | [diff] [blame] | 143 | ERROR("Unable to write persistent property to temp file %s: %s\n", tempPath, strerror(errno)); |
Tammo Spalink | 3dfe6c6 | 2009-08-26 10:13:20 +0800 | [diff] [blame] | 144 | return; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 145 | } |
| 146 | write(fd, value, strlen(value)); |
OPPO | de73a0c | 2014-03-28 19:12:47 +0800 | [diff] [blame] | 147 | fsync(fd); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 148 | close(fd); |
| 149 | |
Nick Kralevich | 7ecfe6a | 2012-10-02 14:59:59 -0700 | [diff] [blame] | 150 | snprintf(path, sizeof(path), "%s/%s", PERSISTENT_PROPERTY_DIR, name); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 151 | if (rename(tempPath, path)) { |
| 152 | unlink(tempPath); |
| 153 | ERROR("Unable to rename persistent property file %s to %s\n", tempPath, path); |
| 154 | } |
| 155 | } |
| 156 | |
Nick Kralevich | 6946361 | 2013-09-13 17:21:28 -0700 | [diff] [blame] | 157 | static bool is_legal_property_name(const char* name, size_t namelen) |
| 158 | { |
| 159 | size_t i; |
Nick Kralevich | 6946361 | 2013-09-13 17:21:28 -0700 | [diff] [blame] | 160 | if (namelen >= PROP_NAME_MAX) return false; |
| 161 | if (namelen < 1) return false; |
| 162 | if (name[0] == '.') return false; |
| 163 | if (name[namelen - 1] == '.') return false; |
| 164 | |
| 165 | /* Only allow alphanumeric, plus '.', '-', or '_' */ |
| 166 | /* Don't allow ".." to appear in a property name */ |
| 167 | for (i = 0; i < namelen; i++) { |
| 168 | if (name[i] == '.') { |
Nick Kralevich | c2c5a24 | 2013-09-16 11:30:48 -0700 | [diff] [blame] | 169 | // i=0 is guaranteed to never have a dot. See above. |
| 170 | if (name[i-1] == '.') return false; |
Nick Kralevich | 6946361 | 2013-09-13 17:21:28 -0700 | [diff] [blame] | 171 | continue; |
| 172 | } |
Nick Kralevich | 6946361 | 2013-09-13 17:21:28 -0700 | [diff] [blame] | 173 | if (name[i] == '_' || name[i] == '-') continue; |
| 174 | if (name[i] >= 'a' && name[i] <= 'z') continue; |
| 175 | if (name[i] >= 'A' && name[i] <= 'Z') continue; |
| 176 | if (name[i] >= '0' && name[i] <= '9') continue; |
| 177 | return false; |
| 178 | } |
| 179 | |
| 180 | return true; |
| 181 | } |
| 182 | |
Elliott Hughes | db3f267 | 2015-03-20 09:45:18 -0700 | [diff] [blame] | 183 | static int property_set_impl(const char* name, const char* value) { |
Nick Kralevich | 7ecfe6a | 2012-10-02 14:59:59 -0700 | [diff] [blame] | 184 | size_t namelen = strlen(name); |
| 185 | size_t valuelen = strlen(value); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 186 | |
Nick Kralevich | 6946361 | 2013-09-13 17:21:28 -0700 | [diff] [blame] | 187 | if (!is_legal_property_name(name, namelen)) return -1; |
| 188 | if (valuelen >= PROP_VALUE_MAX) return -1; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 189 | |
Jeff Sharkey | 7641751 | 2015-06-09 11:02:55 -0700 | [diff] [blame] | 190 | if (strcmp("selinux.reload_policy", name) == 0 && strcmp("1", value) == 0) { |
| 191 | if (selinux_reload_policy() != 0) { |
| 192 | ERROR("Failed to reload policy\n"); |
| 193 | } |
| 194 | } else if (strcmp("selinux.restorecon_recursive", name) == 0 && valuelen > 0) { |
| 195 | if (restorecon_recursive(value) != 0) { |
| 196 | ERROR("Failed to restorecon_recursive %s\n", value); |
| 197 | } |
| 198 | } |
| 199 | |
Elliott Hughes | db3f267 | 2015-03-20 09:45:18 -0700 | [diff] [blame] | 200 | prop_info* pi = (prop_info*) __system_property_find(name); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 201 | |
| 202 | if(pi != 0) { |
| 203 | /* ro.* properties may NEVER be modified once set */ |
| 204 | if(!strncmp(name, "ro.", 3)) return -1; |
| 205 | |
Colin Cross | 9f5af63 | 2013-01-23 23:09:48 -0800 | [diff] [blame] | 206 | __system_property_update(pi, value, valuelen); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 207 | } else { |
Elliott Hughes | db3f267 | 2015-03-20 09:45:18 -0700 | [diff] [blame] | 208 | int rc = __system_property_add(name, namelen, value, valuelen); |
| 209 | if (rc < 0) { |
| 210 | return rc; |
Johan Redestig | fd7ffb1 | 2013-04-29 09:11:57 +0200 | [diff] [blame] | 211 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 212 | } |
| 213 | /* If name starts with "net." treat as a DNS property. */ |
Mike Lockwood | b377955 | 2009-05-08 14:27:42 -0400 | [diff] [blame] | 214 | if (strncmp("net.", name, strlen("net.")) == 0) { |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 215 | if (strcmp("net.change", name) == 0) { |
| 216 | return 0; |
| 217 | } |
Tammo Spalink | 3dfe6c6 | 2009-08-26 10:13:20 +0800 | [diff] [blame] | 218 | /* |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 219 | * The 'net.change' property is a special property used track when any |
| 220 | * 'net.*' property name is updated. It is _ONLY_ updated here. Its value |
| 221 | * contains the last updated 'net.*' property. |
| 222 | */ |
| 223 | property_set("net.change", name); |
| 224 | } else if (persistent_properties_loaded && |
Mike Lockwood | b377955 | 2009-05-08 14:27:42 -0400 | [diff] [blame] | 225 | strncmp("persist.", name, strlen("persist.")) == 0) { |
Tammo Spalink | 3dfe6c6 | 2009-08-26 10:13:20 +0800 | [diff] [blame] | 226 | /* |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 227 | * Don't write properties to disk until after we have read all default properties |
| 228 | * to prevent them from being overwritten by default values. |
| 229 | */ |
Tammo Spalink | 3dfe6c6 | 2009-08-26 10:13:20 +0800 | [diff] [blame] | 230 | write_persistent_property(name, value); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 231 | } |
| 232 | property_changed(name, value); |
| 233 | return 0; |
| 234 | } |
| 235 | |
Elliott Hughes | db3f267 | 2015-03-20 09:45:18 -0700 | [diff] [blame] | 236 | int property_set(const char* name, const char* value) { |
| 237 | int rc = property_set_impl(name, value); |
| 238 | if (rc == -1) { |
Elliott Hughes | 930974c | 2015-03-23 08:07:19 -0700 | [diff] [blame] | 239 | ERROR("property_set(\"%s\", \"%s\") failed\n", name, value); |
Elliott Hughes | db3f267 | 2015-03-20 09:45:18 -0700 | [diff] [blame] | 240 | } |
| 241 | return rc; |
| 242 | } |
| 243 | |
Elliott Hughes | 929f407 | 2015-04-24 21:13:44 -0700 | [diff] [blame] | 244 | static void handle_property_set_fd() |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 245 | { |
| 246 | prop_msg msg; |
| 247 | int s; |
| 248 | int r; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 249 | struct ucred cr; |
| 250 | struct sockaddr_un addr; |
| 251 | socklen_t addr_size = sizeof(addr); |
| 252 | socklen_t cr_size = sizeof(cr); |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 253 | char * source_ctx = NULL; |
JP Abgrall | 4515d81 | 2014-01-31 14:37:07 -0800 | [diff] [blame] | 254 | struct pollfd ufds[1]; |
| 255 | const int timeout_ms = 2 * 1000; /* Default 2 sec timeout for caller to send property. */ |
| 256 | int nr; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 257 | |
Colin Cross | d11beb2 | 2010-04-13 19:33:37 -0700 | [diff] [blame] | 258 | if ((s = accept(property_set_fd, (struct sockaddr *) &addr, &addr_size)) < 0) { |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 259 | return; |
| 260 | } |
| 261 | |
| 262 | /* Check socket options here */ |
| 263 | if (getsockopt(s, SOL_SOCKET, SO_PEERCRED, &cr, &cr_size) < 0) { |
| 264 | close(s); |
Nick Kralevich | 7ecfe6a | 2012-10-02 14:59:59 -0700 | [diff] [blame] | 265 | ERROR("Unable to receive socket options\n"); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 266 | return; |
| 267 | } |
| 268 | |
JP Abgrall | 4515d81 | 2014-01-31 14:37:07 -0800 | [diff] [blame] | 269 | ufds[0].fd = s; |
| 270 | ufds[0].events = POLLIN; |
| 271 | ufds[0].revents = 0; |
| 272 | nr = TEMP_FAILURE_RETRY(poll(ufds, 1, timeout_ms)); |
| 273 | if (nr == 0) { |
| 274 | ERROR("sys_prop: timeout waiting for uid=%d to send property message.\n", cr.uid); |
| 275 | close(s); |
| 276 | return; |
| 277 | } else if (nr < 0) { |
Elliott Hughes | cd67f00 | 2015-03-20 17:05:56 -0700 | [diff] [blame] | 278 | ERROR("sys_prop: error waiting for uid=%d to send property message: %s\n", cr.uid, strerror(errno)); |
JP Abgrall | 4515d81 | 2014-01-31 14:37:07 -0800 | [diff] [blame] | 279 | close(s); |
| 280 | return; |
| 281 | } |
| 282 | |
| 283 | r = TEMP_FAILURE_RETRY(recv(s, &msg, sizeof(msg), MSG_DONTWAIT)); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 284 | if(r != sizeof(prop_msg)) { |
Elliott Hughes | cd67f00 | 2015-03-20 17:05:56 -0700 | [diff] [blame] | 285 | ERROR("sys_prop: mis-match msg size received: %d expected: %zu: %s\n", |
| 286 | r, sizeof(prop_msg), strerror(errno)); |
Brad Fitzpatrick | 9f1e0e3 | 2011-03-30 12:39:56 -0700 | [diff] [blame] | 287 | close(s); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 288 | return; |
| 289 | } |
| 290 | |
| 291 | switch(msg.cmd) { |
| 292 | case PROP_MSG_SETPROP: |
| 293 | msg.name[PROP_NAME_MAX-1] = 0; |
| 294 | msg.value[PROP_VALUE_MAX-1] = 0; |
| 295 | |
Nick Kralevich | 6946361 | 2013-09-13 17:21:28 -0700 | [diff] [blame] | 296 | if (!is_legal_property_name(msg.name, strlen(msg.name))) { |
| 297 | ERROR("sys_prop: illegal property name. Got: \"%s\"\n", msg.name); |
| 298 | close(s); |
| 299 | return; |
| 300 | } |
| 301 | |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 302 | getpeercon(s, &source_ctx); |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 303 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 304 | if(memcmp(msg.name,"ctl.",4) == 0) { |
Brad Fitzpatrick | 71ead18 | 2011-04-01 08:24:13 -0700 | [diff] [blame] | 305 | // Keep the old close-socket-early behavior when handling |
| 306 | // ctl.* properties. |
| 307 | close(s); |
William Roberts | d7aea44 | 2015-10-01 16:03:47 -0700 | [diff] [blame] | 308 | if (check_control_mac_perms(msg.value, source_ctx, &cr)) { |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 309 | handle_control_message((char*) msg.name + 4, (char*) msg.value); |
| 310 | } else { |
Wink Saville | cfa0d84 | 2010-10-03 13:30:11 -0700 | [diff] [blame] | 311 | ERROR("sys_prop: Unable to %s service ctl [%s] uid:%d gid:%d pid:%d\n", |
| 312 | msg.name + 4, msg.value, cr.uid, cr.gid, cr.pid); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 313 | } |
| 314 | } else { |
William Roberts | d7aea44 | 2015-10-01 16:03:47 -0700 | [diff] [blame] | 315 | if (check_perms(msg.name, source_ctx, &cr)) { |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 316 | property_set((char*) msg.name, (char*) msg.value); |
| 317 | } else { |
| 318 | ERROR("sys_prop: permission denied uid:%d name:%s\n", |
| 319 | cr.uid, msg.name); |
| 320 | } |
Brad Fitzpatrick | 71ead18 | 2011-04-01 08:24:13 -0700 | [diff] [blame] | 321 | |
| 322 | // Note: bionic's property client code assumes that the |
| 323 | // property server will not close the socket until *AFTER* |
| 324 | // the property is written to memory. |
| 325 | close(s); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 326 | } |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 327 | freecon(source_ctx); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 328 | break; |
| 329 | |
| 330 | default: |
Brad Fitzpatrick | 71ead18 | 2011-04-01 08:24:13 -0700 | [diff] [blame] | 331 | close(s); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 332 | break; |
| 333 | } |
| 334 | } |
| 335 | |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 336 | static void load_properties_from_file(const char *, const char *); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 337 | |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 338 | /* |
| 339 | * Filter is used to decide which properties to load: NULL loads all keys, |
| 340 | * "ro.foo.*" is a prefix match, and "ro.foo.bar" is an exact match. |
| 341 | */ |
| 342 | static void load_properties(char *data, const char *filter) |
| 343 | { |
| 344 | char *key, *value, *eol, *sol, *tmp, *fn; |
| 345 | size_t flen = 0; |
| 346 | |
| 347 | if (filter) { |
| 348 | flen = strlen(filter); |
| 349 | } |
| 350 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 351 | sol = data; |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 352 | while ((eol = strchr(sol, '\n'))) { |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 353 | key = sol; |
| 354 | *eol++ = 0; |
| 355 | sol = eol; |
| 356 | |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 357 | while (isspace(*key)) key++; |
| 358 | if (*key == '#') continue; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 359 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 360 | tmp = eol - 2; |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 361 | while ((tmp > key) && isspace(*tmp)) *tmp-- = 0; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 362 | |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 363 | if (!strncmp(key, "import ", 7) && flen == 0) { |
| 364 | fn = key + 7; |
| 365 | while (isspace(*fn)) fn++; |
| 366 | |
| 367 | key = strchr(fn, ' '); |
| 368 | if (key) { |
| 369 | *key++ = 0; |
| 370 | while (isspace(*key)) key++; |
| 371 | } |
| 372 | |
| 373 | load_properties_from_file(fn, key); |
| 374 | |
| 375 | } else { |
| 376 | value = strchr(key, '='); |
| 377 | if (!value) continue; |
| 378 | *value++ = 0; |
| 379 | |
| 380 | tmp = value - 2; |
| 381 | while ((tmp > key) && isspace(*tmp)) *tmp-- = 0; |
| 382 | |
| 383 | while (isspace(*value)) value++; |
| 384 | |
| 385 | if (flen > 0) { |
| 386 | if (filter[flen - 1] == '*') { |
| 387 | if (strncmp(key, filter, flen - 1)) continue; |
| 388 | } else { |
| 389 | if (strcmp(key, filter)) continue; |
| 390 | } |
| 391 | } |
| 392 | |
| 393 | property_set(key, value); |
| 394 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 395 | } |
| 396 | } |
| 397 | |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 398 | /* |
| 399 | * Filter is used to decide which properties to load: NULL loads all keys, |
| 400 | * "ro.foo.*" is a prefix match, and "ro.foo.bar" is an exact match. |
| 401 | */ |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 402 | static void load_properties_from_file(const char* filename, const char* filter) { |
| 403 | Timer t; |
Elliott Hughes | f682b47 | 2015-02-06 12:19:48 -0800 | [diff] [blame] | 404 | std::string data; |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 405 | if (read_file(filename, &data)) { |
Tom Cherry | cce7e93 | 2015-05-12 13:54:41 -0700 | [diff] [blame] | 406 | data.push_back('\n'); |
Elliott Hughes | f682b47 | 2015-02-06 12:19:48 -0800 | [diff] [blame] | 407 | load_properties(&data[0], filter); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 408 | } |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 409 | NOTICE("(Loading properties from %s took %.2fs.)\n", filename, t.duration()); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 410 | } |
| 411 | |
Elliott Hughes | 81399e1 | 2015-03-10 08:39:45 -0700 | [diff] [blame] | 412 | static void load_persistent_properties() { |
| 413 | persistent_properties_loaded = 1; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 414 | |
Elliott Hughes | 81399e1 | 2015-03-10 08:39:45 -0700 | [diff] [blame] | 415 | std::unique_ptr<DIR, int(*)(DIR*)> dir(opendir(PERSISTENT_PROPERTY_DIR), closedir); |
| 416 | if (!dir) { |
| 417 | ERROR("Unable to open persistent property directory \"%s\": %s\n", |
| 418 | PERSISTENT_PROPERTY_DIR, strerror(errno)); |
| 419 | return; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 420 | } |
Tammo Spalink | 3dfe6c6 | 2009-08-26 10:13:20 +0800 | [diff] [blame] | 421 | |
Elliott Hughes | 81399e1 | 2015-03-10 08:39:45 -0700 | [diff] [blame] | 422 | struct dirent* entry; |
| 423 | while ((entry = readdir(dir.get())) != NULL) { |
| 424 | if (strncmp("persist.", entry->d_name, strlen("persist."))) { |
| 425 | continue; |
| 426 | } |
| 427 | if (entry->d_type != DT_REG) { |
| 428 | continue; |
| 429 | } |
| 430 | |
| 431 | // Open the file and read the property value. |
| 432 | int fd = openat(dirfd(dir.get()), entry->d_name, O_RDONLY | O_NOFOLLOW); |
| 433 | if (fd == -1) { |
| 434 | ERROR("Unable to open persistent property file \"%s\": %s\n", |
| 435 | entry->d_name, strerror(errno)); |
| 436 | continue; |
| 437 | } |
| 438 | |
| 439 | struct stat sb; |
| 440 | if (fstat(fd, &sb) == -1) { |
| 441 | ERROR("fstat on property file \"%s\" failed: %s\n", entry->d_name, strerror(errno)); |
| 442 | close(fd); |
| 443 | continue; |
| 444 | } |
| 445 | |
| 446 | // File must not be accessible to others, be owned by root/root, and |
| 447 | // not be a hard link to any other file. |
| 448 | if (((sb.st_mode & (S_IRWXG | S_IRWXO)) != 0) || (sb.st_uid != 0) || (sb.st_gid != 0) || |
| 449 | (sb.st_nlink != 1)) { |
| 450 | ERROR("skipping insecure property file %s (uid=%u gid=%u nlink=%u mode=%o)\n", |
| 451 | entry->d_name, (unsigned int)sb.st_uid, (unsigned int)sb.st_gid, |
| 452 | (unsigned int)sb.st_nlink, sb.st_mode); |
| 453 | close(fd); |
| 454 | continue; |
| 455 | } |
| 456 | |
| 457 | char value[PROP_VALUE_MAX]; |
| 458 | int length = read(fd, value, sizeof(value) - 1); |
| 459 | if (length >= 0) { |
| 460 | value[length] = 0; |
| 461 | property_set(entry->d_name, value); |
| 462 | } else { |
| 463 | ERROR("Unable to read persistent property file %s: %s\n", |
| 464 | entry->d_name, strerror(errno)); |
| 465 | } |
| 466 | close(fd); |
| 467 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 468 | } |
| 469 | |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 470 | void property_load_boot_defaults() { |
Andrew Boie | 3899f52 | 2012-10-12 15:23:40 -0700 | [diff] [blame] | 471 | load_properties_from_file(PROP_PATH_RAMDISK_DEFAULT, NULL); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 472 | } |
| 473 | |
Nick Kralevich | 32b9023 | 2012-09-19 11:15:24 -0700 | [diff] [blame] | 474 | static void load_override_properties() { |
Elliott Hughes | c0e919c | 2015-02-04 14:46:36 -0800 | [diff] [blame] | 475 | if (ALLOW_LOCAL_PROP_OVERRIDE) { |
Yabin Cui | 74edcea | 2015-07-24 10:11:05 -0700 | [diff] [blame] | 476 | std::string debuggable = property_get("ro.debuggable"); |
| 477 | if (debuggable == "1") { |
Elliott Hughes | c0e919c | 2015-02-04 14:46:36 -0800 | [diff] [blame] | 478 | load_properties_from_file(PROP_PATH_LOCAL_OVERRIDE, NULL); |
| 479 | } |
Nick Kralevich | 32b9023 | 2012-09-19 11:15:24 -0700 | [diff] [blame] | 480 | } |
Nick Kralevich | 32b9023 | 2012-09-19 11:15:24 -0700 | [diff] [blame] | 481 | } |
| 482 | |
Ken Sumrall | c5c5103 | 2011-03-08 17:01:29 -0800 | [diff] [blame] | 483 | /* When booting an encrypted system, /data is not mounted when the |
| 484 | * property service is started, so any properties stored there are |
| 485 | * not loaded. Vold triggers init to load these properties once it |
| 486 | * has mounted /data. |
| 487 | */ |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 488 | void load_persist_props(void) { |
Nick Kralevich | 32b9023 | 2012-09-19 11:15:24 -0700 | [diff] [blame] | 489 | load_override_properties(); |
Ken Sumrall | c5c5103 | 2011-03-08 17:01:29 -0800 | [diff] [blame] | 490 | /* Read persistent properties after all default values have been loaded. */ |
| 491 | load_persistent_properties(); |
| 492 | } |
| 493 | |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 494 | void load_recovery_id_prop() { |
Yabin Cui | 74edcea | 2015-07-24 10:11:05 -0700 | [diff] [blame] | 495 | std::string ro_hardware = property_get("ro.hardware"); |
| 496 | if (ro_hardware.empty()) { |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 497 | ERROR("ro.hardware not set - unable to load recovery id\n"); |
| 498 | return; |
| 499 | } |
Yabin Cui | 74edcea | 2015-07-24 10:11:05 -0700 | [diff] [blame] | 500 | std::string fstab_filename = FSTAB_PREFIX + ro_hardware; |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 501 | |
Yabin Cui | 74edcea | 2015-07-24 10:11:05 -0700 | [diff] [blame] | 502 | std::unique_ptr<fstab, void(*)(fstab*)> tab(fs_mgr_read_fstab(fstab_filename.c_str()), |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 503 | fs_mgr_free_fstab); |
| 504 | if (!tab) { |
Yabin Cui | 74edcea | 2015-07-24 10:11:05 -0700 | [diff] [blame] | 505 | ERROR("unable to read fstab %s: %s\n", fstab_filename.c_str(), strerror(errno)); |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 506 | return; |
| 507 | } |
| 508 | |
| 509 | fstab_rec* rec = fs_mgr_get_entry_for_mount_point(tab.get(), RECOVERY_MOUNT_POINT); |
| 510 | if (rec == NULL) { |
| 511 | ERROR("/recovery not specified in fstab\n"); |
| 512 | return; |
| 513 | } |
| 514 | |
| 515 | int fd = open(rec->blk_device, O_RDONLY); |
| 516 | if (fd == -1) { |
| 517 | ERROR("error opening block device %s: %s\n", rec->blk_device, strerror(errno)); |
| 518 | return; |
| 519 | } |
| 520 | |
| 521 | boot_img_hdr hdr; |
| 522 | if (android::base::ReadFully(fd, &hdr, sizeof(hdr))) { |
| 523 | std::string hex = bytes_to_hex(reinterpret_cast<uint8_t*>(hdr.id), sizeof(hdr.id)); |
| 524 | property_set("ro.recovery_id", hex.c_str()); |
| 525 | } else { |
| 526 | ERROR("error reading /recovery: %s\n", strerror(errno)); |
| 527 | } |
| 528 | |
| 529 | close(fd); |
| 530 | } |
| 531 | |
Paul Lawrence | 948410a | 2015-07-01 14:40:56 -0700 | [diff] [blame] | 532 | void load_system_props() { |
Andrew Boie | 3899f52 | 2012-10-12 15:23:40 -0700 | [diff] [blame] | 533 | load_properties_from_file(PROP_PATH_SYSTEM_BUILD, NULL); |
Daniel Rosenberg | b951222 | 2014-11-10 17:01:33 -0800 | [diff] [blame] | 534 | load_properties_from_file(PROP_PATH_VENDOR_BUILD, NULL); |
Jeff Sharkey | f96b044 | 2014-03-06 14:26:36 -0800 | [diff] [blame] | 535 | load_properties_from_file(PROP_PATH_FACTORY, "ro.*"); |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 536 | load_recovery_id_prop(); |
Riley Andrews | e4b7b29 | 2014-06-16 15:06:21 -0700 | [diff] [blame] | 537 | } |
| 538 | |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 539 | void start_property_service() { |
Elliott Hughes | c6c26ed | 2015-04-24 18:50:30 -0700 | [diff] [blame] | 540 | property_set_fd = create_socket(PROP_SERVICE_NAME, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, |
| 541 | 0666, 0, 0, NULL); |
| 542 | if (property_set_fd == -1) { |
| 543 | ERROR("start_property_service socket creation failed: %s\n", strerror(errno)); |
| 544 | exit(1); |
| 545 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 546 | |
Elliott Hughes | c6c26ed | 2015-04-24 18:50:30 -0700 | [diff] [blame] | 547 | listen(property_set_fd, 8); |
Colin Cross | d11beb2 | 2010-04-13 19:33:37 -0700 | [diff] [blame] | 548 | |
Elliott Hughes | 929f407 | 2015-04-24 21:13:44 -0700 | [diff] [blame] | 549 | register_epoll_handler(property_set_fd, handle_property_set_fd); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 550 | } |