blob: 6cdb9574e74507c33a6da7e86fb73164dd41a679 [file] [log] [blame]
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -08001/*
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>
Matthew Xie40a91a22013-05-20 14:22:01 -070030#include <cutils/multiuser.h>
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080031
32#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
33#include <sys/_system_properties.h>
34
35#include <sys/socket.h>
36#include <sys/un.h>
37#include <sys/select.h>
38#include <sys/types.h>
39#include <netinet/in.h>
40#include <sys/mman.h>
41#include <sys/atomics.h>
42#include <private/android_filesystem_config.h>
43
rpcraig63207cd2012-08-09 10:05:49 -040044#include <selinux/selinux.h>
45#include <selinux/label.h>
rpcraig63207cd2012-08-09 10:05:49 -040046
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080047#include "property_service.h"
48#include "init.h"
Colin Cross3899e9f2010-04-13 20:35:46 -070049#include "util.h"
Colin Crossed8a7d82010-04-19 17:05:34 -070050#include "log.h"
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080051
52#define PERSISTENT_PROPERTY_DIR "/data/property"
53
54static int persistent_properties_loaded = 0;
Colin Cross3294bbb2010-04-19 17:11:33 -070055static int property_area_inited = 0;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080056
Colin Crossd11beb22010-04-13 19:33:37 -070057static int property_set_fd = -1;
58
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080059/* White list of permissions for setting property services. */
60struct {
61 const char *prefix;
62 unsigned int uid;
Mike Lockwoodc5e7ef22009-09-02 18:08:52 -040063 unsigned int gid;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080064} property_perms[] = {
Mike Lockwoodc5e7ef22009-09-02 18:08:52 -040065 { "net.rmnet0.", AID_RADIO, 0 },
66 { "net.gprs.", AID_RADIO, 0 },
67 { "net.ppp", AID_RADIO, 0 },
Amol Bhatkarcf015972011-02-18 17:54:17 -060068 { "net.qmi", AID_RADIO, 0 },
Benoit Goby7100f642011-07-25 18:02:06 -070069 { "net.lte", AID_RADIO, 0 },
Benoit Goby22bfc4c2011-07-28 18:09:55 -070070 { "net.cdma", AID_RADIO, 0 },
Mike Lockwoodc5e7ef22009-09-02 18:08:52 -040071 { "ril.", AID_RADIO, 0 },
72 { "gsm.", AID_RADIO, 0 },
73 { "persist.radio", AID_RADIO, 0 },
74 { "net.dns", AID_RADIO, 0 },
Benoit Goby5da93582011-08-22 12:12:37 -070075 { "sys.usb.config", AID_RADIO, 0 },
Mike Lockwoodc5e7ef22009-09-02 18:08:52 -040076 { "net.", AID_SYSTEM, 0 },
77 { "dev.", AID_SYSTEM, 0 },
78 { "runtime.", AID_SYSTEM, 0 },
79 { "hw.", AID_SYSTEM, 0 },
80 { "sys.", AID_SYSTEM, 0 },
Nick Kralevichca8e66a2013-04-18 12:20:02 -070081 { "sys.powerctl", AID_SHELL, 0 },
Mike Lockwoodc5e7ef22009-09-02 18:08:52 -040082 { "service.", AID_SYSTEM, 0 },
83 { "wlan.", AID_SYSTEM, 0 },
Nicolas SUET841859f2013-06-21 15:59:20 +020084 { "gps.", AID_GPS, 0 },
Jeonghoon lime953e962012-08-14 18:12:33 -070085 { "bluetooth.", AID_BLUETOOTH, 0 },
Mike Lockwoodc5e7ef22009-09-02 18:08:52 -040086 { "dhcp.", AID_SYSTEM, 0 },
87 { "dhcp.", AID_DHCP, 0 },
Romain Guy45fa13f2012-04-27 15:19:30 -070088 { "debug.", AID_SYSTEM, 0 },
Mike Lockwoodc5e7ef22009-09-02 18:08:52 -040089 { "debug.", AID_SHELL, 0 },
90 { "log.", AID_SHELL, 0 },
91 { "service.adb.root", AID_SHELL, 0 },
Mike Lockwood58aa5b02010-12-10 09:48:41 -080092 { "service.adb.tcp.port", AID_SHELL, 0 },
Mike Lockwoodc5e7ef22009-09-02 18:08:52 -040093 { "persist.sys.", AID_SYSTEM, 0 },
94 { "persist.service.", AID_SYSTEM, 0 },
Oscar Montemayoref4e2152009-11-12 12:02:24 -080095 { "persist.security.", AID_SYSTEM, 0 },
Nicolas SUET841859f2013-06-21 15:59:20 +020096 { "persist.gps.", AID_GPS, 0 },
Ravi Nagarajana8afd722012-08-02 04:58:21 -070097 { "persist.service.bdroid.", AID_BLUETOOTH, 0 },
Stephen Smalleyae6f3d72012-05-01 15:02:53 -040098 { "selinux." , AID_SYSTEM, 0 },
Mike Lockwoodc5e7ef22009-09-02 18:08:52 -040099 { NULL, 0, 0 }
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800100};
101
102/*
103 * White list of UID that are allowed to start/stop services.
104 * Currently there are no user apps that require.
105 */
106struct {
107 const char *service;
108 unsigned int uid;
Mike Lockwoodc5e7ef22009-09-02 18:08:52 -0400109 unsigned int gid;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800110} control_perms[] = {
Mike Lockwoodc5e7ef22009-09-02 18:08:52 -0400111 { "dumpstate",AID_SHELL, AID_LOG },
Wink Savillecfa0d842010-10-03 13:30:11 -0700112 { "ril-daemon",AID_RADIO, AID_RADIO },
Doug Zongker7baebf12014-01-14 12:30:40 -0800113 { "pre-recovery", AID_SYSTEM, AID_SYSTEM },
Mike Lockwoodc5e7ef22009-09-02 18:08:52 -0400114 {NULL, 0, 0 }
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800115};
116
117typedef struct {
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800118 size_t size;
Nick Kralevich28406472013-01-22 12:46:09 -0800119 int fd;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800120} workspace;
121
122static int init_workspace(workspace *w, size_t size)
123{
124 void *data;
Greg Hackmannf14eef02013-02-12 14:39:31 -0800125 int fd = open(PROP_FILENAME, O_RDONLY | O_NOFOLLOW);
Brian Swetland25b15be2010-07-13 16:43:56 -0700126 if (fd < 0)
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800127 return -1;
128
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800129 w->size = size;
Nick Kralevich28406472013-01-22 12:46:09 -0800130 w->fd = fd;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800131 return 0;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800132}
133
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800134static workspace pa_workspace;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800135
136static int init_property_area(void)
137{
Colin Cross9f5af632013-01-23 23:09:48 -0800138 if (property_area_inited)
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800139 return -1;
140
Greg Hackmannf14eef02013-02-12 14:39:31 -0800141 if(__system_property_area_init())
142 return -1;
143
144 if(init_workspace(&pa_workspace, 0))
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800145 return -1;
146
Nick Kralevich28406472013-01-22 12:46:09 -0800147 fcntl(pa_workspace.fd, F_SETFD, FD_CLOEXEC);
148
Colin Cross3294bbb2010-04-19 17:11:33 -0700149 property_area_inited = 1;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800150 return 0;
151}
152
rpcraig63207cd2012-08-09 10:05:49 -0400153static int check_mac_perms(const char *name, char *sctx)
154{
rpcraig63207cd2012-08-09 10:05:49 -0400155 if (is_selinux_enabled() <= 0)
156 return 1;
157
158 char *tctx = NULL;
159 const char *class = "property_service";
160 const char *perm = "set";
161 int result = 0;
162
163 if (!sctx)
164 goto err;
165
166 if (!sehandle_prop)
167 goto err;
168
169 if (selabel_lookup(sehandle_prop, &tctx, name, 1) != 0)
170 goto err;
171
172 if (selinux_check_access(sctx, tctx, class, perm, name) == 0)
173 result = 1;
174
175 freecon(tctx);
176 err:
177 return result;
rpcraig63207cd2012-08-09 10:05:49 -0400178}
179
180static int check_control_mac_perms(const char *name, char *sctx)
181{
rpcraig63207cd2012-08-09 10:05:49 -0400182 /*
183 * Create a name prefix out of ctl.<service name>
184 * The new prefix allows the use of the existing
185 * property service backend labeling while avoiding
186 * mislabels based on true property prefixes.
187 */
188 char ctl_name[PROP_VALUE_MAX+4];
189 int ret = snprintf(ctl_name, sizeof(ctl_name), "ctl.%s", name);
190
191 if (ret < 0 || (size_t) ret >= sizeof(ctl_name))
192 return 0;
193
194 return check_mac_perms(ctl_name, sctx);
rpcraig63207cd2012-08-09 10:05:49 -0400195}
196
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800197/*
198 * Checks permissions for starting/stoping system services.
199 * AID_SYSTEM and AID_ROOT are always allowed.
200 *
201 * Returns 1 if uid allowed, 0 otherwise.
202 */
rpcraig63207cd2012-08-09 10:05:49 -0400203static int check_control_perms(const char *name, unsigned int uid, unsigned int gid, char *sctx) {
204
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800205 int i;
206 if (uid == AID_SYSTEM || uid == AID_ROOT)
rpcraig63207cd2012-08-09 10:05:49 -0400207 return check_control_mac_perms(name, sctx);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800208
209 /* Search the ACL */
210 for (i = 0; control_perms[i].service; i++) {
211 if (strcmp(control_perms[i].service, name) == 0) {
Mike Lockwoodc5e7ef22009-09-02 18:08:52 -0400212 if ((uid && control_perms[i].uid == uid) ||
213 (gid && control_perms[i].gid == gid)) {
rpcraig63207cd2012-08-09 10:05:49 -0400214 return check_control_mac_perms(name, sctx);
Mike Lockwoodc5e7ef22009-09-02 18:08:52 -0400215 }
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800216 }
217 }
218 return 0;
219}
220
221/*
222 * Checks permissions for setting system properties.
223 * Returns 1 if uid allowed, 0 otherwise.
224 */
rpcraig63207cd2012-08-09 10:05:49 -0400225static int check_perms(const char *name, unsigned int uid, unsigned int gid, char *sctx)
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800226{
227 int i;
Matthew Xie40a91a22013-05-20 14:22:01 -0700228 unsigned int app_id;
229
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800230 if(!strncmp(name, "ro.", 3))
231 name +=3;
232
rpcraig63207cd2012-08-09 10:05:49 -0400233 if (uid == 0)
234 return check_mac_perms(name, sctx);
235
Matthew Xie40a91a22013-05-20 14:22:01 -0700236 app_id = multiuser_get_app_id(uid);
237 if (app_id == AID_BLUETOOTH) {
238 uid = app_id;
239 }
240
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800241 for (i = 0; property_perms[i].prefix; i++) {
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800242 if (strncmp(property_perms[i].prefix, name,
243 strlen(property_perms[i].prefix)) == 0) {
Mike Lockwoodc5e7ef22009-09-02 18:08:52 -0400244 if ((uid && property_perms[i].uid == uid) ||
245 (gid && property_perms[i].gid == gid)) {
rpcraig63207cd2012-08-09 10:05:49 -0400246
247 return check_mac_perms(name, sctx);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800248 }
249 }
250 }
251
252 return 0;
253}
254
Colin Cross88ac54a2013-01-29 14:58:57 -0800255int __property_get(const char *name, char *value)
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800256{
Colin Cross2deedfe2013-01-28 17:13:35 -0800257 return __system_property_get(name, value);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800258}
259
Tammo Spalink3dfe6c62009-08-26 10:13:20 +0800260static void write_persistent_property(const char *name, const char *value)
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800261{
Nick Kralevich7ecfe6a2012-10-02 14:59:59 -0700262 char tempPath[PATH_MAX];
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800263 char path[PATH_MAX];
Nick Kralevich7ecfe6a2012-10-02 14:59:59 -0700264 int fd;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800265
Nick Kralevich7ecfe6a2012-10-02 14:59:59 -0700266 snprintf(tempPath, sizeof(tempPath), "%s/.temp.XXXXXX", PERSISTENT_PROPERTY_DIR);
267 fd = mkstemp(tempPath);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800268 if (fd < 0) {
269 ERROR("Unable to write persistent property to temp file %s errno: %d\n", tempPath, errno);
Tammo Spalink3dfe6c62009-08-26 10:13:20 +0800270 return;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800271 }
272 write(fd, value, strlen(value));
273 close(fd);
274
Nick Kralevich7ecfe6a2012-10-02 14:59:59 -0700275 snprintf(path, sizeof(path), "%s/%s", PERSISTENT_PROPERTY_DIR, name);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800276 if (rename(tempPath, path)) {
277 unlink(tempPath);
278 ERROR("Unable to rename persistent property file %s to %s\n", tempPath, path);
279 }
280}
281
Nick Kralevich69463612013-09-13 17:21:28 -0700282static bool is_legal_property_name(const char* name, size_t namelen)
283{
284 size_t i;
Nick Kralevich69463612013-09-13 17:21:28 -0700285 if (namelen >= PROP_NAME_MAX) return false;
286 if (namelen < 1) return false;
287 if (name[0] == '.') return false;
288 if (name[namelen - 1] == '.') return false;
289
290 /* Only allow alphanumeric, plus '.', '-', or '_' */
291 /* Don't allow ".." to appear in a property name */
292 for (i = 0; i < namelen; i++) {
293 if (name[i] == '.') {
Nick Kralevichc2c5a242013-09-16 11:30:48 -0700294 // i=0 is guaranteed to never have a dot. See above.
295 if (name[i-1] == '.') return false;
Nick Kralevich69463612013-09-13 17:21:28 -0700296 continue;
297 }
Nick Kralevich69463612013-09-13 17:21:28 -0700298 if (name[i] == '_' || name[i] == '-') continue;
299 if (name[i] >= 'a' && name[i] <= 'z') continue;
300 if (name[i] >= 'A' && name[i] <= 'Z') continue;
301 if (name[i] >= '0' && name[i] <= '9') continue;
302 return false;
303 }
304
305 return true;
306}
307
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800308int property_set(const char *name, const char *value)
309{
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800310 prop_info *pi;
Colin Cross9f5af632013-01-23 23:09:48 -0800311 int ret;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800312
Nick Kralevich7ecfe6a2012-10-02 14:59:59 -0700313 size_t namelen = strlen(name);
314 size_t valuelen = strlen(value);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800315
Nick Kralevich69463612013-09-13 17:21:28 -0700316 if (!is_legal_property_name(name, namelen)) return -1;
317 if (valuelen >= PROP_VALUE_MAX) return -1;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800318
319 pi = (prop_info*) __system_property_find(name);
320
321 if(pi != 0) {
322 /* ro.* properties may NEVER be modified once set */
323 if(!strncmp(name, "ro.", 3)) return -1;
324
Colin Cross9f5af632013-01-23 23:09:48 -0800325 __system_property_update(pi, value, valuelen);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800326 } else {
Colin Cross9f5af632013-01-23 23:09:48 -0800327 ret = __system_property_add(name, namelen, value, valuelen);
328 if (ret < 0) {
Nick Kralevich69463612013-09-13 17:21:28 -0700329 ERROR("Failed to set '%s'='%s'\n", name, value);
Colin Cross9f5af632013-01-23 23:09:48 -0800330 return ret;
Johan Redestigfd7ffb12013-04-29 09:11:57 +0200331 }
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800332 }
333 /* If name starts with "net." treat as a DNS property. */
Mike Lockwoodb3779552009-05-08 14:27:42 -0400334 if (strncmp("net.", name, strlen("net.")) == 0) {
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800335 if (strcmp("net.change", name) == 0) {
336 return 0;
337 }
Tammo Spalink3dfe6c62009-08-26 10:13:20 +0800338 /*
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800339 * The 'net.change' property is a special property used track when any
340 * 'net.*' property name is updated. It is _ONLY_ updated here. Its value
341 * contains the last updated 'net.*' property.
342 */
343 property_set("net.change", name);
344 } else if (persistent_properties_loaded &&
Mike Lockwoodb3779552009-05-08 14:27:42 -0400345 strncmp("persist.", name, strlen("persist.")) == 0) {
Tammo Spalink3dfe6c62009-08-26 10:13:20 +0800346 /*
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800347 * Don't write properties to disk until after we have read all default properties
348 * to prevent them from being overwritten by default values.
349 */
Tammo Spalink3dfe6c62009-08-26 10:13:20 +0800350 write_persistent_property(name, value);
repo sync8a387872013-05-17 12:47:04 -0700351 } else if (strcmp("selinux.reload_policy", name) == 0 &&
352 strcmp("1", value) == 0) {
353 selinux_reload_policy();
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800354 }
355 property_changed(name, value);
356 return 0;
357}
358
Colin Crossd11beb22010-04-13 19:33:37 -0700359void handle_property_set_fd()
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800360{
361 prop_msg msg;
362 int s;
363 int r;
364 int res;
365 struct ucred cr;
366 struct sockaddr_un addr;
367 socklen_t addr_size = sizeof(addr);
368 socklen_t cr_size = sizeof(cr);
rpcraig63207cd2012-08-09 10:05:49 -0400369 char * source_ctx = NULL;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800370
Colin Crossd11beb22010-04-13 19:33:37 -0700371 if ((s = accept(property_set_fd, (struct sockaddr *) &addr, &addr_size)) < 0) {
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800372 return;
373 }
374
375 /* Check socket options here */
376 if (getsockopt(s, SOL_SOCKET, SO_PEERCRED, &cr, &cr_size) < 0) {
377 close(s);
Nick Kralevich7ecfe6a2012-10-02 14:59:59 -0700378 ERROR("Unable to receive socket options\n");
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800379 return;
380 }
381
Mike Lockwoodd18678f2011-07-01 14:48:50 -0400382 r = TEMP_FAILURE_RETRY(recv(s, &msg, sizeof(msg), 0));
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800383 if(r != sizeof(prop_msg)) {
Nick Kralevich7ecfe6a2012-10-02 14:59:59 -0700384 ERROR("sys_prop: mis-match msg size received: %d expected: %d errno: %d\n",
Mike Lockwoodd18678f2011-07-01 14:48:50 -0400385 r, sizeof(prop_msg), errno);
Brad Fitzpatrick9f1e0e32011-03-30 12:39:56 -0700386 close(s);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800387 return;
388 }
389
390 switch(msg.cmd) {
391 case PROP_MSG_SETPROP:
392 msg.name[PROP_NAME_MAX-1] = 0;
393 msg.value[PROP_VALUE_MAX-1] = 0;
394
Nick Kralevich69463612013-09-13 17:21:28 -0700395 if (!is_legal_property_name(msg.name, strlen(msg.name))) {
396 ERROR("sys_prop: illegal property name. Got: \"%s\"\n", msg.name);
397 close(s);
398 return;
399 }
400
rpcraig63207cd2012-08-09 10:05:49 -0400401 getpeercon(s, &source_ctx);
rpcraig63207cd2012-08-09 10:05:49 -0400402
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800403 if(memcmp(msg.name,"ctl.",4) == 0) {
Brad Fitzpatrick71ead182011-04-01 08:24:13 -0700404 // Keep the old close-socket-early behavior when handling
405 // ctl.* properties.
406 close(s);
rpcraig63207cd2012-08-09 10:05:49 -0400407 if (check_control_perms(msg.value, cr.uid, cr.gid, source_ctx)) {
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800408 handle_control_message((char*) msg.name + 4, (char*) msg.value);
409 } else {
Wink Savillecfa0d842010-10-03 13:30:11 -0700410 ERROR("sys_prop: Unable to %s service ctl [%s] uid:%d gid:%d pid:%d\n",
411 msg.name + 4, msg.value, cr.uid, cr.gid, cr.pid);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800412 }
413 } else {
rpcraig63207cd2012-08-09 10:05:49 -0400414 if (check_perms(msg.name, cr.uid, cr.gid, source_ctx)) {
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800415 property_set((char*) msg.name, (char*) msg.value);
416 } else {
417 ERROR("sys_prop: permission denied uid:%d name:%s\n",
418 cr.uid, msg.name);
419 }
Brad Fitzpatrick71ead182011-04-01 08:24:13 -0700420
421 // Note: bionic's property client code assumes that the
422 // property server will not close the socket until *AFTER*
423 // the property is written to memory.
424 close(s);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800425 }
rpcraig63207cd2012-08-09 10:05:49 -0400426 freecon(source_ctx);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800427 break;
428
429 default:
Brad Fitzpatrick71ead182011-04-01 08:24:13 -0700430 close(s);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800431 break;
432 }
433}
434
Nick Kralevich28406472013-01-22 12:46:09 -0800435void get_property_workspace(int *fd, int *sz)
436{
437 *fd = pa_workspace.fd;
438 *sz = pa_workspace.size;
439}
440
Andrew Boie3899f522012-10-12 15:23:40 -0700441static void load_properties(char *data, char *prefix)
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800442{
443 char *key, *value, *eol, *sol, *tmp;
Andrew Boie3899f522012-10-12 15:23:40 -0700444 size_t plen;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800445
Andrew Boie3899f522012-10-12 15:23:40 -0700446 if (prefix)
447 plen = strlen(prefix);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800448 sol = data;
449 while((eol = strchr(sol, '\n'))) {
450 key = sol;
451 *eol++ = 0;
452 sol = eol;
453
454 value = strchr(key, '=');
455 if(value == 0) continue;
456 *value++ = 0;
457
458 while(isspace(*key)) key++;
459 if(*key == '#') continue;
460 tmp = value - 2;
461 while((tmp > key) && isspace(*tmp)) *tmp-- = 0;
462
Andrew Boie3899f522012-10-12 15:23:40 -0700463 if (prefix && strncmp(key, prefix, plen))
464 continue;
465
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800466 while(isspace(*value)) value++;
467 tmp = eol - 2;
468 while((tmp > value) && isspace(*tmp)) *tmp-- = 0;
469
470 property_set(key, value);
471 }
472}
473
Andrew Boie3899f522012-10-12 15:23:40 -0700474static void load_properties_from_file(const char *fn, char *prefix)
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800475{
476 char *data;
477 unsigned sz;
478
479 data = read_file(fn, &sz);
480
481 if(data != 0) {
Andrew Boie3899f522012-10-12 15:23:40 -0700482 load_properties(data, prefix);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800483 free(data);
484 }
485}
486
487static void load_persistent_properties()
488{
489 DIR* dir = opendir(PERSISTENT_PROPERTY_DIR);
Yi-wei Zhaoe41bc312012-10-23 21:09:56 +0800490 int dir_fd;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800491 struct dirent* entry;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800492 char value[PROP_VALUE_MAX];
493 int fd, length;
Nick Kralevich7ecfe6a2012-10-02 14:59:59 -0700494 struct stat sb;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800495
496 if (dir) {
Yi-wei Zhaoe41bc312012-10-23 21:09:56 +0800497 dir_fd = dirfd(dir);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800498 while ((entry = readdir(dir)) != NULL) {
Mike Lockwoodb3779552009-05-08 14:27:42 -0400499 if (strncmp("persist.", entry->d_name, strlen("persist.")))
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800500 continue;
501#if HAVE_DIRENT_D_TYPE
502 if (entry->d_type != DT_REG)
503 continue;
504#endif
505 /* open the file and read the property value */
Nick Kralevich7ecfe6a2012-10-02 14:59:59 -0700506 fd = openat(dir_fd, entry->d_name, O_RDONLY | O_NOFOLLOW);
507 if (fd < 0) {
508 ERROR("Unable to open persistent property file \"%s\" errno: %d\n",
509 entry->d_name, errno);
510 continue;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800511 }
Nick Kralevich7ecfe6a2012-10-02 14:59:59 -0700512 if (fstat(fd, &sb) < 0) {
513 ERROR("fstat on property file \"%s\" failed errno: %d\n", entry->d_name, errno);
514 close(fd);
515 continue;
516 }
517
518 // File must not be accessible to others, be owned by root/root, and
519 // not be a hard link to any other file.
520 if (((sb.st_mode & (S_IRWXG | S_IRWXO)) != 0)
521 || (sb.st_uid != 0)
522 || (sb.st_gid != 0)
523 || (sb.st_nlink != 1)) {
524 ERROR("skipping insecure property file %s (uid=%lu gid=%lu nlink=%d mode=%o)\n",
525 entry->d_name, sb.st_uid, sb.st_gid, sb.st_nlink, sb.st_mode);
526 close(fd);
527 continue;
528 }
529
530 length = read(fd, value, sizeof(value) - 1);
531 if (length >= 0) {
532 value[length] = 0;
533 property_set(entry->d_name, value);
534 } else {
535 ERROR("Unable to read persistent property file %s errno: %d\n",
536 entry->d_name, errno);
537 }
538 close(fd);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800539 }
540 closedir(dir);
541 } else {
542 ERROR("Unable to open persistent property directory %s errno: %d\n", PERSISTENT_PROPERTY_DIR, errno);
543 }
Tammo Spalink3dfe6c62009-08-26 10:13:20 +0800544
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800545 persistent_properties_loaded = 1;
546}
547
Dima Zavin88861122011-12-19 11:21:32 -0800548void property_init(void)
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800549{
550 init_property_area();
Dima Zavin88861122011-12-19 11:21:32 -0800551}
552
553void property_load_boot_defaults(void)
554{
Andrew Boie3899f522012-10-12 15:23:40 -0700555 load_properties_from_file(PROP_PATH_RAMDISK_DEFAULT, NULL);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800556}
557
Colin Cross3294bbb2010-04-19 17:11:33 -0700558int properties_inited(void)
559{
560 return property_area_inited;
561}
562
Nick Kralevich32b90232012-09-19 11:15:24 -0700563static void load_override_properties() {
564#ifdef ALLOW_LOCAL_PROP_OVERRIDE
Colin Cross2deedfe2013-01-28 17:13:35 -0800565 char debuggable[PROP_VALUE_MAX];
566 int ret;
567
568 ret = property_get("ro.debuggable", debuggable);
569 if (ret && (strcmp(debuggable, "1") == 0)) {
Andrew Boie3899f522012-10-12 15:23:40 -0700570 load_properties_from_file(PROP_PATH_LOCAL_OVERRIDE, NULL);
Nick Kralevich32b90232012-09-19 11:15:24 -0700571 }
572#endif /* ALLOW_LOCAL_PROP_OVERRIDE */
573}
574
575
Ken Sumrallc5c51032011-03-08 17:01:29 -0800576/* When booting an encrypted system, /data is not mounted when the
577 * property service is started, so any properties stored there are
578 * not loaded. Vold triggers init to load these properties once it
579 * has mounted /data.
580 */
581void load_persist_props(void)
582{
Nick Kralevich32b90232012-09-19 11:15:24 -0700583 load_override_properties();
Ken Sumrallc5c51032011-03-08 17:01:29 -0800584 /* Read persistent properties after all default values have been loaded. */
585 load_persistent_properties();
586}
587
Colin Crossd11beb22010-04-13 19:33:37 -0700588void start_property_service(void)
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800589{
590 int fd;
591
Andrew Boie3899f522012-10-12 15:23:40 -0700592 load_properties_from_file(PROP_PATH_SYSTEM_BUILD, NULL);
593 load_properties_from_file(PROP_PATH_SYSTEM_DEFAULT, NULL);
594 load_properties_from_file(PROP_PATH_FACTORY, "ro.");
Nick Kralevich32b90232012-09-19 11:15:24 -0700595 load_override_properties();
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800596 /* Read persistent properties after all default values have been loaded. */
597 load_persistent_properties();
598
Stephen Smalley8348d272013-05-13 12:37:04 -0400599 fd = create_socket(PROP_SERVICE_NAME, SOCK_STREAM, 0666, 0, 0, NULL);
Colin Crossd11beb22010-04-13 19:33:37 -0700600 if(fd < 0) return;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800601 fcntl(fd, F_SETFD, FD_CLOEXEC);
602 fcntl(fd, F_SETFL, O_NONBLOCK);
603
604 listen(fd, 8);
Colin Crossd11beb22010-04-13 19:33:37 -0700605 property_set_fd = fd;
606}
607
608int get_property_set_fd()
609{
610 return property_set_fd;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800611}