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> |
| 27 | |
| 28 | #include <cutils/misc.h> |
| 29 | #include <cutils/sockets.h> |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 30 | |
| 31 | #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ |
| 32 | #include <sys/_system_properties.h> |
| 33 | |
| 34 | #include <sys/socket.h> |
| 35 | #include <sys/un.h> |
| 36 | #include <sys/select.h> |
| 37 | #include <sys/types.h> |
| 38 | #include <netinet/in.h> |
| 39 | #include <sys/mman.h> |
| 40 | #include <sys/atomics.h> |
| 41 | #include <private/android_filesystem_config.h> |
| 42 | |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 43 | #ifdef HAVE_SELINUX |
| 44 | #include <selinux/selinux.h> |
| 45 | #include <selinux/label.h> |
| 46 | #endif |
| 47 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 48 | #include "property_service.h" |
| 49 | #include "init.h" |
Colin Cross | 3899e9f | 2010-04-13 20:35:46 -0700 | [diff] [blame] | 50 | #include "util.h" |
Colin Cross | ed8a7d8 | 2010-04-19 17:05:34 -0700 | [diff] [blame] | 51 | #include "log.h" |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 52 | |
| 53 | #define PERSISTENT_PROPERTY_DIR "/data/property" |
| 54 | |
| 55 | static int persistent_properties_loaded = 0; |
Colin Cross | 3294bbb | 2010-04-19 17:11:33 -0700 | [diff] [blame] | 56 | static int property_area_inited = 0; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 57 | |
Colin Cross | d11beb2 | 2010-04-13 19:33:37 -0700 | [diff] [blame] | 58 | static int property_set_fd = -1; |
| 59 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 60 | /* White list of permissions for setting property services. */ |
| 61 | struct { |
| 62 | const char *prefix; |
| 63 | unsigned int uid; |
Mike Lockwood | c5e7ef2 | 2009-09-02 18:08:52 -0400 | [diff] [blame] | 64 | unsigned int gid; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 65 | } property_perms[] = { |
Mike Lockwood | c5e7ef2 | 2009-09-02 18:08:52 -0400 | [diff] [blame] | 66 | { "net.rmnet0.", AID_RADIO, 0 }, |
| 67 | { "net.gprs.", AID_RADIO, 0 }, |
| 68 | { "net.ppp", AID_RADIO, 0 }, |
Amol Bhatkar | cf01597 | 2011-02-18 17:54:17 -0600 | [diff] [blame] | 69 | { "net.qmi", AID_RADIO, 0 }, |
Benoit Goby | 7100f64 | 2011-07-25 18:02:06 -0700 | [diff] [blame] | 70 | { "net.lte", AID_RADIO, 0 }, |
Benoit Goby | 22bfc4c | 2011-07-28 18:09:55 -0700 | [diff] [blame] | 71 | { "net.cdma", AID_RADIO, 0 }, |
Mike Lockwood | c5e7ef2 | 2009-09-02 18:08:52 -0400 | [diff] [blame] | 72 | { "ril.", AID_RADIO, 0 }, |
| 73 | { "gsm.", AID_RADIO, 0 }, |
| 74 | { "persist.radio", AID_RADIO, 0 }, |
| 75 | { "net.dns", AID_RADIO, 0 }, |
Benoit Goby | 5da9358 | 2011-08-22 12:12:37 -0700 | [diff] [blame] | 76 | { "sys.usb.config", AID_RADIO, 0 }, |
Mike Lockwood | c5e7ef2 | 2009-09-02 18:08:52 -0400 | [diff] [blame] | 77 | { "net.", AID_SYSTEM, 0 }, |
| 78 | { "dev.", AID_SYSTEM, 0 }, |
| 79 | { "runtime.", AID_SYSTEM, 0 }, |
| 80 | { "hw.", AID_SYSTEM, 0 }, |
| 81 | { "sys.", AID_SYSTEM, 0 }, |
| 82 | { "service.", AID_SYSTEM, 0 }, |
| 83 | { "wlan.", AID_SYSTEM, 0 }, |
Jeonghoon lim | e953e96 | 2012-08-14 18:12:33 -0700 | [diff] [blame^] | 84 | { "bluetooth.", AID_BLUETOOTH, 0 }, |
Mike Lockwood | c5e7ef2 | 2009-09-02 18:08:52 -0400 | [diff] [blame] | 85 | { "dhcp.", AID_SYSTEM, 0 }, |
| 86 | { "dhcp.", AID_DHCP, 0 }, |
Romain Guy | 45fa13f | 2012-04-27 15:19:30 -0700 | [diff] [blame] | 87 | { "debug.", AID_SYSTEM, 0 }, |
Mike Lockwood | c5e7ef2 | 2009-09-02 18:08:52 -0400 | [diff] [blame] | 88 | { "debug.", AID_SHELL, 0 }, |
| 89 | { "log.", AID_SHELL, 0 }, |
| 90 | { "service.adb.root", AID_SHELL, 0 }, |
Mike Lockwood | 58aa5b0 | 2010-12-10 09:48:41 -0800 | [diff] [blame] | 91 | { "service.adb.tcp.port", AID_SHELL, 0 }, |
Mike Lockwood | c5e7ef2 | 2009-09-02 18:08:52 -0400 | [diff] [blame] | 92 | { "persist.sys.", AID_SYSTEM, 0 }, |
| 93 | { "persist.service.", AID_SYSTEM, 0 }, |
Oscar Montemayor | ef4e215 | 2009-11-12 12:02:24 -0800 | [diff] [blame] | 94 | { "persist.security.", AID_SYSTEM, 0 }, |
Ravi Nagarajan | a8afd72 | 2012-08-02 04:58:21 -0700 | [diff] [blame] | 95 | { "persist.service.bdroid.", AID_BLUETOOTH, 0 }, |
Stephen Smalley | ae6f3d7 | 2012-05-01 15:02:53 -0400 | [diff] [blame] | 96 | { "selinux." , AID_SYSTEM, 0 }, |
Mike Lockwood | c5e7ef2 | 2009-09-02 18:08:52 -0400 | [diff] [blame] | 97 | { NULL, 0, 0 } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 98 | }; |
| 99 | |
| 100 | /* |
| 101 | * White list of UID that are allowed to start/stop services. |
| 102 | * Currently there are no user apps that require. |
| 103 | */ |
| 104 | struct { |
| 105 | const char *service; |
| 106 | unsigned int uid; |
Mike Lockwood | c5e7ef2 | 2009-09-02 18:08:52 -0400 | [diff] [blame] | 107 | unsigned int gid; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 108 | } control_perms[] = { |
Mike Lockwood | c5e7ef2 | 2009-09-02 18:08:52 -0400 | [diff] [blame] | 109 | { "dumpstate",AID_SHELL, AID_LOG }, |
Wink Saville | cfa0d84 | 2010-10-03 13:30:11 -0700 | [diff] [blame] | 110 | { "ril-daemon",AID_RADIO, AID_RADIO }, |
Mike Lockwood | c5e7ef2 | 2009-09-02 18:08:52 -0400 | [diff] [blame] | 111 | {NULL, 0, 0 } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 112 | }; |
| 113 | |
| 114 | typedef struct { |
| 115 | void *data; |
| 116 | size_t size; |
| 117 | int fd; |
| 118 | } workspace; |
| 119 | |
| 120 | static int init_workspace(workspace *w, size_t size) |
| 121 | { |
| 122 | void *data; |
| 123 | int fd; |
| 124 | |
Brian Swetland | 25b15be | 2010-07-13 16:43:56 -0700 | [diff] [blame] | 125 | /* dev is a tmpfs that we can use to carve a shared workspace |
| 126 | * out of, so let's do that... |
| 127 | */ |
| 128 | fd = open("/dev/__properties__", O_RDWR | O_CREAT, 0600); |
| 129 | if (fd < 0) |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 130 | return -1; |
| 131 | |
Brian Swetland | 25b15be | 2010-07-13 16:43:56 -0700 | [diff] [blame] | 132 | if (ftruncate(fd, size) < 0) |
| 133 | goto out; |
| 134 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 135 | data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
| 136 | if(data == MAP_FAILED) |
| 137 | goto out; |
| 138 | |
Brian Swetland | 25b15be | 2010-07-13 16:43:56 -0700 | [diff] [blame] | 139 | close(fd); |
| 140 | |
| 141 | fd = open("/dev/__properties__", O_RDONLY); |
| 142 | if (fd < 0) |
| 143 | return -1; |
| 144 | |
| 145 | unlink("/dev/__properties__"); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 146 | |
| 147 | w->data = data; |
| 148 | w->size = size; |
| 149 | w->fd = fd; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 150 | return 0; |
| 151 | |
| 152 | out: |
| 153 | close(fd); |
| 154 | return -1; |
| 155 | } |
| 156 | |
| 157 | /* (8 header words + 247 toc words) = 1020 bytes */ |
| 158 | /* 1024 bytes header and toc + 247 prop_infos @ 128 bytes = 32640 bytes */ |
| 159 | |
| 160 | #define PA_COUNT_MAX 247 |
| 161 | #define PA_INFO_START 1024 |
| 162 | #define PA_SIZE 32768 |
| 163 | |
| 164 | static workspace pa_workspace; |
| 165 | static prop_info *pa_info_array; |
| 166 | |
| 167 | extern prop_area *__system_property_area__; |
| 168 | |
| 169 | static int init_property_area(void) |
| 170 | { |
| 171 | prop_area *pa; |
| 172 | |
| 173 | if(pa_info_array) |
| 174 | return -1; |
| 175 | |
| 176 | if(init_workspace(&pa_workspace, PA_SIZE)) |
| 177 | return -1; |
| 178 | |
| 179 | fcntl(pa_workspace.fd, F_SETFD, FD_CLOEXEC); |
| 180 | |
| 181 | pa_info_array = (void*) (((char*) pa_workspace.data) + PA_INFO_START); |
| 182 | |
| 183 | pa = pa_workspace.data; |
| 184 | memset(pa, 0, PA_SIZE); |
| 185 | pa->magic = PROP_AREA_MAGIC; |
| 186 | pa->version = PROP_AREA_VERSION; |
| 187 | |
| 188 | /* plug into the lib property services */ |
| 189 | __system_property_area__ = pa; |
Colin Cross | 3294bbb | 2010-04-19 17:11:33 -0700 | [diff] [blame] | 190 | property_area_inited = 1; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 191 | return 0; |
| 192 | } |
| 193 | |
| 194 | static void update_prop_info(prop_info *pi, const char *value, unsigned len) |
| 195 | { |
| 196 | pi->serial = pi->serial | 1; |
| 197 | memcpy(pi->value, value, len + 1); |
| 198 | pi->serial = (len << 24) | ((pi->serial + 1) & 0xffffff); |
| 199 | __futex_wake(&pi->serial, INT32_MAX); |
| 200 | } |
| 201 | |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 202 | static int check_mac_perms(const char *name, char *sctx) |
| 203 | { |
| 204 | #ifdef HAVE_SELINUX |
| 205 | if (is_selinux_enabled() <= 0) |
| 206 | return 1; |
| 207 | |
| 208 | char *tctx = NULL; |
| 209 | const char *class = "property_service"; |
| 210 | const char *perm = "set"; |
| 211 | int result = 0; |
| 212 | |
| 213 | if (!sctx) |
| 214 | goto err; |
| 215 | |
| 216 | if (!sehandle_prop) |
| 217 | goto err; |
| 218 | |
| 219 | if (selabel_lookup(sehandle_prop, &tctx, name, 1) != 0) |
| 220 | goto err; |
| 221 | |
| 222 | if (selinux_check_access(sctx, tctx, class, perm, name) == 0) |
| 223 | result = 1; |
| 224 | |
| 225 | freecon(tctx); |
| 226 | err: |
| 227 | return result; |
| 228 | |
| 229 | #endif |
| 230 | return 1; |
| 231 | } |
| 232 | |
| 233 | static int check_control_mac_perms(const char *name, char *sctx) |
| 234 | { |
| 235 | #ifdef HAVE_SELINUX |
| 236 | |
| 237 | /* |
| 238 | * Create a name prefix out of ctl.<service name> |
| 239 | * The new prefix allows the use of the existing |
| 240 | * property service backend labeling while avoiding |
| 241 | * mislabels based on true property prefixes. |
| 242 | */ |
| 243 | char ctl_name[PROP_VALUE_MAX+4]; |
| 244 | int ret = snprintf(ctl_name, sizeof(ctl_name), "ctl.%s", name); |
| 245 | |
| 246 | if (ret < 0 || (size_t) ret >= sizeof(ctl_name)) |
| 247 | return 0; |
| 248 | |
| 249 | return check_mac_perms(ctl_name, sctx); |
| 250 | |
| 251 | #endif |
| 252 | return 1; |
| 253 | } |
| 254 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 255 | /* |
| 256 | * Checks permissions for starting/stoping system services. |
| 257 | * AID_SYSTEM and AID_ROOT are always allowed. |
| 258 | * |
| 259 | * Returns 1 if uid allowed, 0 otherwise. |
| 260 | */ |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 261 | static int check_control_perms(const char *name, unsigned int uid, unsigned int gid, char *sctx) { |
| 262 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 263 | int i; |
| 264 | if (uid == AID_SYSTEM || uid == AID_ROOT) |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 265 | return check_control_mac_perms(name, sctx); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 266 | |
| 267 | /* Search the ACL */ |
| 268 | for (i = 0; control_perms[i].service; i++) { |
| 269 | if (strcmp(control_perms[i].service, name) == 0) { |
Mike Lockwood | c5e7ef2 | 2009-09-02 18:08:52 -0400 | [diff] [blame] | 270 | if ((uid && control_perms[i].uid == uid) || |
| 271 | (gid && control_perms[i].gid == gid)) { |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 272 | return check_control_mac_perms(name, sctx); |
Mike Lockwood | c5e7ef2 | 2009-09-02 18:08:52 -0400 | [diff] [blame] | 273 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 274 | } |
| 275 | } |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | /* |
| 280 | * Checks permissions for setting system properties. |
| 281 | * Returns 1 if uid allowed, 0 otherwise. |
| 282 | */ |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 283 | static int check_perms(const char *name, unsigned int uid, unsigned int gid, char *sctx) |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 284 | { |
| 285 | int i; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 286 | if(!strncmp(name, "ro.", 3)) |
| 287 | name +=3; |
| 288 | |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 289 | if (uid == 0) |
| 290 | return check_mac_perms(name, sctx); |
| 291 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 292 | for (i = 0; property_perms[i].prefix; i++) { |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 293 | if (strncmp(property_perms[i].prefix, name, |
| 294 | strlen(property_perms[i].prefix)) == 0) { |
Mike Lockwood | c5e7ef2 | 2009-09-02 18:08:52 -0400 | [diff] [blame] | 295 | if ((uid && property_perms[i].uid == uid) || |
| 296 | (gid && property_perms[i].gid == gid)) { |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 297 | |
| 298 | return check_mac_perms(name, sctx); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 299 | } |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | return 0; |
| 304 | } |
| 305 | |
| 306 | const char* property_get(const char *name) |
| 307 | { |
| 308 | prop_info *pi; |
| 309 | |
| 310 | if(strlen(name) >= PROP_NAME_MAX) return 0; |
| 311 | |
| 312 | pi = (prop_info*) __system_property_find(name); |
| 313 | |
| 314 | if(pi != 0) { |
| 315 | return pi->value; |
| 316 | } else { |
| 317 | return 0; |
| 318 | } |
| 319 | } |
| 320 | |
Tammo Spalink | 3dfe6c6 | 2009-08-26 10:13:20 +0800 | [diff] [blame] | 321 | 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] | 322 | { |
| 323 | const char *tempPath = PERSISTENT_PROPERTY_DIR "/.temp"; |
| 324 | char path[PATH_MAX]; |
| 325 | int fd, length; |
| 326 | |
| 327 | snprintf(path, sizeof(path), "%s/%s", PERSISTENT_PROPERTY_DIR, name); |
| 328 | |
| 329 | fd = open(tempPath, O_WRONLY|O_CREAT|O_TRUNC, 0600); |
| 330 | if (fd < 0) { |
| 331 | ERROR("Unable to write persistent property to temp file %s errno: %d\n", tempPath, errno); |
Tammo Spalink | 3dfe6c6 | 2009-08-26 10:13:20 +0800 | [diff] [blame] | 332 | return; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 333 | } |
| 334 | write(fd, value, strlen(value)); |
| 335 | close(fd); |
| 336 | |
| 337 | if (rename(tempPath, path)) { |
| 338 | unlink(tempPath); |
| 339 | ERROR("Unable to rename persistent property file %s to %s\n", tempPath, path); |
| 340 | } |
| 341 | } |
| 342 | |
| 343 | int property_set(const char *name, const char *value) |
| 344 | { |
| 345 | prop_area *pa; |
| 346 | prop_info *pi; |
| 347 | |
| 348 | int namelen = strlen(name); |
| 349 | int valuelen = strlen(value); |
| 350 | |
| 351 | if(namelen >= PROP_NAME_MAX) return -1; |
| 352 | if(valuelen >= PROP_VALUE_MAX) return -1; |
| 353 | if(namelen < 1) return -1; |
| 354 | |
| 355 | pi = (prop_info*) __system_property_find(name); |
| 356 | |
| 357 | if(pi != 0) { |
| 358 | /* ro.* properties may NEVER be modified once set */ |
| 359 | if(!strncmp(name, "ro.", 3)) return -1; |
| 360 | |
| 361 | pa = __system_property_area__; |
| 362 | update_prop_info(pi, value, valuelen); |
| 363 | pa->serial++; |
| 364 | __futex_wake(&pa->serial, INT32_MAX); |
| 365 | } else { |
| 366 | pa = __system_property_area__; |
| 367 | if(pa->count == PA_COUNT_MAX) return -1; |
| 368 | |
| 369 | pi = pa_info_array + pa->count; |
| 370 | pi->serial = (valuelen << 24); |
| 371 | memcpy(pi->name, name, namelen + 1); |
| 372 | memcpy(pi->value, value, valuelen + 1); |
| 373 | |
| 374 | pa->toc[pa->count] = |
| 375 | (namelen << 24) | (((unsigned) pi) - ((unsigned) pa)); |
| 376 | |
| 377 | pa->count++; |
| 378 | pa->serial++; |
| 379 | __futex_wake(&pa->serial, INT32_MAX); |
| 380 | } |
| 381 | /* If name starts with "net." treat as a DNS property. */ |
Mike Lockwood | b377955 | 2009-05-08 14:27:42 -0400 | [diff] [blame] | 382 | if (strncmp("net.", name, strlen("net.")) == 0) { |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 383 | if (strcmp("net.change", name) == 0) { |
| 384 | return 0; |
| 385 | } |
Tammo Spalink | 3dfe6c6 | 2009-08-26 10:13:20 +0800 | [diff] [blame] | 386 | /* |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 387 | * The 'net.change' property is a special property used track when any |
| 388 | * 'net.*' property name is updated. It is _ONLY_ updated here. Its value |
| 389 | * contains the last updated 'net.*' property. |
| 390 | */ |
| 391 | property_set("net.change", name); |
| 392 | } else if (persistent_properties_loaded && |
Mike Lockwood | b377955 | 2009-05-08 14:27:42 -0400 | [diff] [blame] | 393 | strncmp("persist.", name, strlen("persist.")) == 0) { |
Tammo Spalink | 3dfe6c6 | 2009-08-26 10:13:20 +0800 | [diff] [blame] | 394 | /* |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 395 | * Don't write properties to disk until after we have read all default properties |
| 396 | * to prevent them from being overwritten by default values. |
| 397 | */ |
Tammo Spalink | 3dfe6c6 | 2009-08-26 10:13:20 +0800 | [diff] [blame] | 398 | write_persistent_property(name, value); |
Stephen Smalley | ae6f3d7 | 2012-05-01 15:02:53 -0400 | [diff] [blame] | 399 | #ifdef HAVE_SELINUX |
| 400 | } else if (strcmp("selinux.reload_policy", name) == 0 && |
| 401 | strcmp("1", value) == 0) { |
| 402 | selinux_reload_policy(); |
| 403 | #endif |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 404 | } |
| 405 | property_changed(name, value); |
| 406 | return 0; |
| 407 | } |
| 408 | |
Colin Cross | d11beb2 | 2010-04-13 19:33:37 -0700 | [diff] [blame] | 409 | void handle_property_set_fd() |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 410 | { |
| 411 | prop_msg msg; |
| 412 | int s; |
| 413 | int r; |
| 414 | int res; |
| 415 | struct ucred cr; |
| 416 | struct sockaddr_un addr; |
| 417 | socklen_t addr_size = sizeof(addr); |
| 418 | socklen_t cr_size = sizeof(cr); |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 419 | char * source_ctx = NULL; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 420 | |
Colin Cross | d11beb2 | 2010-04-13 19:33:37 -0700 | [diff] [blame] | 421 | 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] | 422 | return; |
| 423 | } |
| 424 | |
| 425 | /* Check socket options here */ |
| 426 | if (getsockopt(s, SOL_SOCKET, SO_PEERCRED, &cr, &cr_size) < 0) { |
| 427 | close(s); |
| 428 | ERROR("Unable to recieve socket options\n"); |
| 429 | return; |
| 430 | } |
| 431 | |
Mike Lockwood | d18678f | 2011-07-01 14:48:50 -0400 | [diff] [blame] | 432 | r = TEMP_FAILURE_RETRY(recv(s, &msg, sizeof(msg), 0)); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 433 | if(r != sizeof(prop_msg)) { |
Mike Lockwood | d18678f | 2011-07-01 14:48:50 -0400 | [diff] [blame] | 434 | ERROR("sys_prop: mis-match msg size recieved: %d expected: %d errno: %d\n", |
| 435 | r, sizeof(prop_msg), errno); |
Brad Fitzpatrick | 9f1e0e3 | 2011-03-30 12:39:56 -0700 | [diff] [blame] | 436 | close(s); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 437 | return; |
| 438 | } |
| 439 | |
| 440 | switch(msg.cmd) { |
| 441 | case PROP_MSG_SETPROP: |
| 442 | msg.name[PROP_NAME_MAX-1] = 0; |
| 443 | msg.value[PROP_VALUE_MAX-1] = 0; |
| 444 | |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 445 | #ifdef HAVE_SELINUX |
| 446 | getpeercon(s, &source_ctx); |
| 447 | #endif |
| 448 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 449 | if(memcmp(msg.name,"ctl.",4) == 0) { |
Brad Fitzpatrick | 71ead18 | 2011-04-01 08:24:13 -0700 | [diff] [blame] | 450 | // Keep the old close-socket-early behavior when handling |
| 451 | // ctl.* properties. |
| 452 | close(s); |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 453 | if (check_control_perms(msg.value, cr.uid, cr.gid, source_ctx)) { |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 454 | handle_control_message((char*) msg.name + 4, (char*) msg.value); |
| 455 | } else { |
Wink Saville | cfa0d84 | 2010-10-03 13:30:11 -0700 | [diff] [blame] | 456 | ERROR("sys_prop: Unable to %s service ctl [%s] uid:%d gid:%d pid:%d\n", |
| 457 | 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] | 458 | } |
| 459 | } else { |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 460 | if (check_perms(msg.name, cr.uid, cr.gid, source_ctx)) { |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 461 | property_set((char*) msg.name, (char*) msg.value); |
| 462 | } else { |
| 463 | ERROR("sys_prop: permission denied uid:%d name:%s\n", |
| 464 | cr.uid, msg.name); |
| 465 | } |
Brad Fitzpatrick | 71ead18 | 2011-04-01 08:24:13 -0700 | [diff] [blame] | 466 | |
| 467 | // Note: bionic's property client code assumes that the |
| 468 | // property server will not close the socket until *AFTER* |
| 469 | // the property is written to memory. |
| 470 | close(s); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 471 | } |
rpcraig | 63207cd | 2012-08-09 10:05:49 -0400 | [diff] [blame] | 472 | #ifdef HAVE_SELINUX |
| 473 | freecon(source_ctx); |
| 474 | #endif |
| 475 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 476 | break; |
| 477 | |
| 478 | default: |
Brad Fitzpatrick | 71ead18 | 2011-04-01 08:24:13 -0700 | [diff] [blame] | 479 | close(s); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 480 | break; |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | void get_property_workspace(int *fd, int *sz) |
| 485 | { |
| 486 | *fd = pa_workspace.fd; |
| 487 | *sz = pa_workspace.size; |
| 488 | } |
| 489 | |
| 490 | static void load_properties(char *data) |
| 491 | { |
| 492 | char *key, *value, *eol, *sol, *tmp; |
| 493 | |
| 494 | sol = data; |
| 495 | while((eol = strchr(sol, '\n'))) { |
| 496 | key = sol; |
| 497 | *eol++ = 0; |
| 498 | sol = eol; |
| 499 | |
| 500 | value = strchr(key, '='); |
| 501 | if(value == 0) continue; |
| 502 | *value++ = 0; |
| 503 | |
| 504 | while(isspace(*key)) key++; |
| 505 | if(*key == '#') continue; |
| 506 | tmp = value - 2; |
| 507 | while((tmp > key) && isspace(*tmp)) *tmp-- = 0; |
| 508 | |
| 509 | while(isspace(*value)) value++; |
| 510 | tmp = eol - 2; |
| 511 | while((tmp > value) && isspace(*tmp)) *tmp-- = 0; |
| 512 | |
| 513 | property_set(key, value); |
| 514 | } |
| 515 | } |
| 516 | |
| 517 | static void load_properties_from_file(const char *fn) |
| 518 | { |
| 519 | char *data; |
| 520 | unsigned sz; |
| 521 | |
| 522 | data = read_file(fn, &sz); |
| 523 | |
| 524 | if(data != 0) { |
| 525 | load_properties(data); |
| 526 | free(data); |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | static void load_persistent_properties() |
| 531 | { |
| 532 | DIR* dir = opendir(PERSISTENT_PROPERTY_DIR); |
| 533 | struct dirent* entry; |
| 534 | char path[PATH_MAX]; |
| 535 | char value[PROP_VALUE_MAX]; |
| 536 | int fd, length; |
| 537 | |
| 538 | if (dir) { |
| 539 | while ((entry = readdir(dir)) != NULL) { |
Mike Lockwood | b377955 | 2009-05-08 14:27:42 -0400 | [diff] [blame] | 540 | if (strncmp("persist.", entry->d_name, strlen("persist."))) |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 541 | continue; |
| 542 | #if HAVE_DIRENT_D_TYPE |
| 543 | if (entry->d_type != DT_REG) |
| 544 | continue; |
| 545 | #endif |
| 546 | /* open the file and read the property value */ |
| 547 | snprintf(path, sizeof(path), "%s/%s", PERSISTENT_PROPERTY_DIR, entry->d_name); |
| 548 | fd = open(path, O_RDONLY); |
| 549 | if (fd >= 0) { |
| 550 | length = read(fd, value, sizeof(value) - 1); |
| 551 | if (length >= 0) { |
| 552 | value[length] = 0; |
| 553 | property_set(entry->d_name, value); |
| 554 | } else { |
| 555 | ERROR("Unable to read persistent property file %s errno: %d\n", path, errno); |
| 556 | } |
| 557 | close(fd); |
| 558 | } else { |
| 559 | ERROR("Unable to open persistent property file %s errno: %d\n", path, errno); |
| 560 | } |
| 561 | } |
| 562 | closedir(dir); |
| 563 | } else { |
| 564 | ERROR("Unable to open persistent property directory %s errno: %d\n", PERSISTENT_PROPERTY_DIR, errno); |
| 565 | } |
Tammo Spalink | 3dfe6c6 | 2009-08-26 10:13:20 +0800 | [diff] [blame] | 566 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 567 | persistent_properties_loaded = 1; |
| 568 | } |
| 569 | |
Dima Zavin | 8886112 | 2011-12-19 11:21:32 -0800 | [diff] [blame] | 570 | void property_init(void) |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 571 | { |
| 572 | init_property_area(); |
Dima Zavin | 8886112 | 2011-12-19 11:21:32 -0800 | [diff] [blame] | 573 | } |
| 574 | |
| 575 | void property_load_boot_defaults(void) |
| 576 | { |
| 577 | load_properties_from_file(PROP_PATH_RAMDISK_DEFAULT); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 578 | } |
| 579 | |
Colin Cross | 3294bbb | 2010-04-19 17:11:33 -0700 | [diff] [blame] | 580 | int properties_inited(void) |
| 581 | { |
| 582 | return property_area_inited; |
| 583 | } |
| 584 | |
Ken Sumrall | c5c5103 | 2011-03-08 17:01:29 -0800 | [diff] [blame] | 585 | /* When booting an encrypted system, /data is not mounted when the |
| 586 | * property service is started, so any properties stored there are |
| 587 | * not loaded. Vold triggers init to load these properties once it |
| 588 | * has mounted /data. |
| 589 | */ |
| 590 | void load_persist_props(void) |
| 591 | { |
Nick Kralevich | 0dbda7e | 2012-01-18 13:38:34 -0800 | [diff] [blame] | 592 | #ifdef ALLOW_LOCAL_PROP_OVERRIDE |
Ken Sumrall | c5c5103 | 2011-03-08 17:01:29 -0800 | [diff] [blame] | 593 | load_properties_from_file(PROP_PATH_LOCAL_OVERRIDE); |
Nick Kralevich | 0dbda7e | 2012-01-18 13:38:34 -0800 | [diff] [blame] | 594 | #endif /* ALLOW_LOCAL_PROP_OVERRIDE */ |
Ken Sumrall | c5c5103 | 2011-03-08 17:01:29 -0800 | [diff] [blame] | 595 | /* Read persistent properties after all default values have been loaded. */ |
| 596 | load_persistent_properties(); |
| 597 | } |
| 598 | |
Colin Cross | d11beb2 | 2010-04-13 19:33:37 -0700 | [diff] [blame] | 599 | void start_property_service(void) |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 600 | { |
| 601 | int fd; |
| 602 | |
| 603 | load_properties_from_file(PROP_PATH_SYSTEM_BUILD); |
| 604 | load_properties_from_file(PROP_PATH_SYSTEM_DEFAULT); |
Nick Kralevich | 0dbda7e | 2012-01-18 13:38:34 -0800 | [diff] [blame] | 605 | #ifdef ALLOW_LOCAL_PROP_OVERRIDE |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 606 | load_properties_from_file(PROP_PATH_LOCAL_OVERRIDE); |
Nick Kralevich | 0dbda7e | 2012-01-18 13:38:34 -0800 | [diff] [blame] | 607 | #endif /* ALLOW_LOCAL_PROP_OVERRIDE */ |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 608 | /* Read persistent properties after all default values have been loaded. */ |
| 609 | load_persistent_properties(); |
| 610 | |
| 611 | fd = create_socket(PROP_SERVICE_NAME, SOCK_STREAM, 0666, 0, 0); |
Colin Cross | d11beb2 | 2010-04-13 19:33:37 -0700 | [diff] [blame] | 612 | if(fd < 0) return; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 613 | fcntl(fd, F_SETFD, FD_CLOEXEC); |
| 614 | fcntl(fd, F_SETFL, O_NONBLOCK); |
| 615 | |
| 616 | listen(fd, 8); |
Colin Cross | d11beb2 | 2010-04-13 19:33:37 -0700 | [diff] [blame] | 617 | property_set_fd = fd; |
| 618 | } |
| 619 | |
| 620 | int get_property_set_fd() |
| 621 | { |
| 622 | return property_set_fd; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 623 | } |