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 /* This file is used to define the properties of the filesystem
18 ** images generated by build tools (mkbootfs and mkyaffs2image) and
19 ** by the device side of adb.
20 */
21
22 #ifndef _ANDROID_FILESYSTEM_CONFIG_H_
23 #define _ANDROID_FILESYSTEM_CONFIG_H_
24
25 #include <string.h>
26 #include <sys/stat.h>
27 #include <sys/types.h>
28 #include <stdint.h>
29
30 #ifdef HAVE_ANDROID_OS
31 #include <linux/capability.h>
32 #else
33 #include "android_filesystem_capability.h"
34 #endif
35
36 /* This is the master Users and Groups config for the platform.
37 * DO NOT EVER RENUMBER
38 */
39
40 #define AID_ROOT 0 /* traditional unix root user */
41
42 #define AID_SYSTEM 1000 /* system server */
43
44 #define AID_RADIO 1001 /* telephony subsystem, RIL */
45 #define AID_BLUETOOTH 1002 /* bluetooth subsystem */
46 #define AID_GRAPHICS 1003 /* graphics devices */
47 #define AID_INPUT 1004 /* input devices */
48 #define AID_AUDIO 1005 /* audio devices */
49 #define AID_CAMERA 1006 /* camera devices */
50 #define AID_LOG 1007 /* log devices */
51 #define AID_COMPASS 1008 /* compass device */
52 #define AID_MOUNT 1009 /* mountd socket */
53 #define AID_WIFI 1010 /* wifi subsystem */
54 #define AID_ADB 1011 /* android debug bridge (adbd) */
55 #define AID_INSTALL 1012 /* group for installing packages */
56 #define AID_MEDIA 1013 /* mediaserver process */
57 #define AID_DHCP 1014 /* dhcp client */
58 #define AID_SDCARD_RW 1015 /* external storage write access */
59 #define AID_VPN 1016 /* vpn system */
60 #define AID_KEYSTORE 1017 /* keystore subsystem */
61 #define AID_USB 1018 /* USB devices */
62 #define AID_DRM 1019 /* DRM server */
63 #define AID_MDNSR 1020 /* MulticastDNSResponder (service discovery) */
64 #define AID_GPS 1021 /* GPS daemon */
65 #define AID_UNUSED1 1022 /* deprecated, DO NOT USE */
66 #define AID_MEDIA_RW 1023 /* internal media storage write access */
67 #define AID_MTP 1024 /* MTP USB driver access */
68 #define AID_UNUSED2 1025 /* deprecated, DO NOT USE */
69 #define AID_DRMRPC 1026 /* group for drm rpc */
70 #define AID_NFC 1027 /* nfc subsystem */
71 #define AID_SDCARD_R 1028 /* external storage read access */
72 #define AID_CLAT 1029 /* clat part of nat464 */
73 #define AID_LOOP_RADIO 1030 /* loop radio devices */
74 #define AID_MEDIA_DRM 1031 /* MediaDrm plugins */
75 #define AID_PACKAGE_INFO 1032 /* access to installed package details */
76 #define AID_SDCARD_PICS 1033 /* external storage photos access */
77 #define AID_SDCARD_AV 1034 /* external storage audio/video access */
78 #define AID_SDCARD_ALL 1035 /* access all users external storage */
79
80 #define AID_SHELL 2000 /* adb and debug shell user */
81 #define AID_CACHE 2001 /* cache access */
82 #define AID_DIAG 2002 /* access to diagnostic resources */
83
84 /* The 3000 series are intended for use as supplemental group id's only.
85 * They indicate special Android capabilities that the kernel is aware of. */
86 #define AID_NET_BT_ADMIN 3001 /* bluetooth: create any socket */
87 #define AID_NET_BT 3002 /* bluetooth: create sco, rfcomm or l2cap sockets */
88 #define AID_INET 3003 /* can create AF_INET and AF_INET6 sockets */
89 #define AID_NET_RAW 3004 /* can create raw INET sockets */
90 #define AID_NET_ADMIN 3005 /* can configure interfaces and routing tables. */
91 #define AID_NET_BW_STATS 3006 /* read bandwidth statistics */
92 #define AID_NET_BW_ACCT 3007 /* change bandwidth statistics accounting */
93 #define AID_NET_BT_STACK 3008 /* bluetooth: access config files */
94
95 #define AID_MISC 9998 /* access to misc storage */
96 #define AID_NOBODY 9999
97
98 #define AID_APP 10000 /* first app user */
99
100 #define AID_ISOLATED_START 99000 /* start of uids for fully isolated sandboxed processes */
101 #define AID_ISOLATED_END 99999 /* end of uids for fully isolated sandboxed processes */
102
103 #define AID_USER 100000 /* offset for uid ranges for each user */
104
105 #define AID_SHARED_GID_START 50000 /* start of gids for apps in each user to share */
106 #define AID_SHARED_GID_END 59999 /* start of gids for apps in each user to share */
107
108 #if !defined(EXCLUDE_FS_CONFIG_STRUCTURES)
109 struct android_id_info {
110 const char *name;
111 unsigned aid;
112 };
113
114 static const struct android_id_info android_ids[] = {
115 { "root", AID_ROOT, },
116
117 { "system", AID_SYSTEM, },
118
119 { "radio", AID_RADIO, },
120 { "bluetooth", AID_BLUETOOTH, },
121 { "graphics", AID_GRAPHICS, },
122 { "input", AID_INPUT, },
123 { "audio", AID_AUDIO, },
124 { "camera", AID_CAMERA, },
125 { "log", AID_LOG, },
126 { "compass", AID_COMPASS, },
127 { "mount", AID_MOUNT, },
128 { "wifi", AID_WIFI, },
129 { "adb", AID_ADB, },
130 { "install", AID_INSTALL, },
131 { "media", AID_MEDIA, },
132 { "dhcp", AID_DHCP, },
133 { "sdcard_rw", AID_SDCARD_RW, },
134 { "vpn", AID_VPN, },
135 { "keystore", AID_KEYSTORE, },
136 { "usb", AID_USB, },
137 { "drm", AID_DRM, },
138 { "mdnsr", AID_MDNSR, },
139 { "gps", AID_GPS, },
140 // AID_UNUSED1
141 { "media_rw", AID_MEDIA_RW, },
142 { "mtp", AID_MTP, },
143 // AID_UNUSED2
144 { "drmrpc", AID_DRMRPC, },
145 { "nfc", AID_NFC, },
146 { "sdcard_r", AID_SDCARD_R, },
147 { "clat", AID_CLAT, },
148 { "loop_radio", AID_LOOP_RADIO, },
149 { "mediadrm", AID_MEDIA_DRM, },
150 { "package_info", AID_PACKAGE_INFO, },
151 { "sdcard_pics", AID_SDCARD_PICS, },
152 { "sdcard_av", AID_SDCARD_AV, },
153 { "sdcard_all", AID_SDCARD_ALL, },
154
155 { "shell", AID_SHELL, },
156 { "cache", AID_CACHE, },
157 { "diag", AID_DIAG, },
158
159 { "net_bt_admin", AID_NET_BT_ADMIN, },
160 { "net_bt", AID_NET_BT, },
161 { "inet", AID_INET, },
162 { "net_raw", AID_NET_RAW, },
163 { "net_admin", AID_NET_ADMIN, },
164 { "net_bw_stats", AID_NET_BW_STATS, },
165 { "net_bw_acct", AID_NET_BW_ACCT, },
166 { "net_bt_stack", AID_NET_BT_STACK, },
167
168 { "misc", AID_MISC, },
169 { "nobody", AID_NOBODY, },
170 };
171
172 #define android_id_count \
173 (sizeof(android_ids) / sizeof(android_ids[0]))
174
175 struct fs_path_config {
176 unsigned mode;
177 unsigned uid;
178 unsigned gid;
179 uint64_t capabilities;
180 const char *prefix;
181 };
182
183 /* Rules for directories.
184 ** These rules are applied based on "first match", so they
185 ** should start with the most specific path and work their
186 ** way up to the root.
187 */
188
189 static const struct fs_path_config android_dirs[] = {
190 { 00770, AID_SYSTEM, AID_CACHE, 0, "cache" },
191 { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/app" },
192 { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/app-private" },
193 { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/dalvik-cache" },
194 { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/data" },
195 { 00771, AID_SHELL, AID_SHELL, 0, "data/local/tmp" },
196 { 00771, AID_SHELL, AID_SHELL, 0, "data/local" },
197 { 01771, AID_SYSTEM, AID_MISC, 0, "data/misc" },
198 { 00770, AID_DHCP, AID_DHCP, 0, "data/misc/dhcp" },
199 { 00775, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media" },
200 { 00775, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media/Music" },
201 { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data" },
202 { 00750, AID_ROOT, AID_SHELL, 0, "sbin" },
203 { 00755, AID_ROOT, AID_SHELL, 0, "system/bin" },
204 { 00755, AID_ROOT, AID_SHELL, 0, "system/vendor" },
205 { 00755, AID_ROOT, AID_SHELL, 0, "system/xbin" },
206 { 00755, AID_ROOT, AID_ROOT, 0, "system/etc/ppp" },
207 { 00755, AID_ROOT, AID_SHELL, 0, "vendor" },
208 { 00777, AID_ROOT, AID_ROOT, 0, "sdcard" },
209 { 00755, AID_ROOT, AID_ROOT, 0, 0 },
210 };
211
212 /* Rules for files.
213 ** These rules are applied based on "first match", so they
214 ** should start with the most specific path and work their
215 ** way up to the root. Prefixes ending in * denotes wildcard
216 ** and will allow partial matches.
217 */
218 static const struct fs_path_config android_files[] = {
219 { 00440, AID_ROOT, AID_SHELL, 0, "system/etc/init.goldfish.rc" },
220 { 00550, AID_ROOT, AID_SHELL, 0, "system/etc/init.goldfish.sh" },
221 { 00440, AID_ROOT, AID_SHELL, 0, "system/etc/init.trout.rc" },
222 { 00550, AID_ROOT, AID_SHELL, 0, "system/etc/init.ril" },
223 { 00550, AID_ROOT, AID_SHELL, 0, "system/etc/init.testmenu" },
224 { 00550, AID_DHCP, AID_SHELL, 0, "system/etc/dhcpcd/dhcpcd-run-hooks" },
225 { 00444, AID_RADIO, AID_AUDIO, 0, "system/etc/AudioPara4.csv" },
226 { 00555, AID_ROOT, AID_ROOT, 0, "system/etc/ppp/*" },
227 { 00555, AID_ROOT, AID_ROOT, 0, "system/etc/rc.*" },
228 { 00644, AID_SYSTEM, AID_SYSTEM, 0, "data/app/*" },
229 { 00644, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media/*" },
230 { 00644, AID_SYSTEM, AID_SYSTEM, 0, "data/app-private/*" },
231 { 00644, AID_APP, AID_APP, 0, "data/data/*" },
232 { 00755, AID_ROOT, AID_ROOT, 0, "system/bin/ping" },
233
234 /* the following file is INTENTIONALLY set-gid and not set-uid.
235 * Do not change. */
236 { 02750, AID_ROOT, AID_INET, 0, "system/bin/netcfg" },
237
238 /* the following five files are INTENTIONALLY set-uid, but they
239 * are NOT included on user builds. */
240 { 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/su" },
241 { 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/librank" },
242 { 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/procrank" },
243 { 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/procmem" },
244 { 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/tcpdump" },
245 { 04770, AID_ROOT, AID_RADIO, 0, "system/bin/pppd-ril" },
246
247 /* the following files have enhanced capabilities and ARE included in user builds. */
248 { 00750, AID_ROOT, AID_SHELL, (1 << CAP_SETUID) | (1 << CAP_SETGID), "system/bin/run-as" },
249
250 { 00755, AID_ROOT, AID_SHELL, 0, "system/bin/*" },
251 { 00755, AID_ROOT, AID_ROOT, 0, "system/lib/valgrind/*" },
252 { 00755, AID_ROOT, AID_SHELL, 0, "system/xbin/*" },
253 { 00755, AID_ROOT, AID_SHELL, 0, "system/vendor/bin/*" },
254 { 00755, AID_ROOT, AID_SHELL, 0, "vendor/bin/*" },
255 { 00750, AID_ROOT, AID_SHELL, 0, "sbin/*" },
256 { 00755, AID_ROOT, AID_ROOT, 0, "bin/*" },
257 { 00750, AID_ROOT, AID_SHELL, 0, "init*" },
258 { 00750, AID_ROOT, AID_SHELL, 0, "charger*" },
259 { 00750, AID_ROOT, AID_SHELL, 0, "sbin/fs_mgr" },
260 { 00640, AID_ROOT, AID_SHELL, 0, "fstab.*" },
261 { 00644, AID_ROOT, AID_ROOT, 0, 0 },
262 };
263
fs_config(const char * path,int dir,unsigned * uid,unsigned * gid,unsigned * mode,uint64_t * capabilities)264 static inline void fs_config(const char *path, int dir,
265 unsigned *uid, unsigned *gid, unsigned *mode, uint64_t *capabilities)
266 {
267 const struct fs_path_config *pc;
268 int plen;
269
270 if (path[0] == '/') {
271 path++;
272 }
273
274 pc = dir ? android_dirs : android_files;
275 plen = strlen(path);
276 for(; pc->prefix; pc++){
277 int len = strlen(pc->prefix);
278 if (dir) {
279 if(plen < len) continue;
280 if(!strncmp(pc->prefix, path, len)) break;
281 continue;
282 }
283 /* If name ends in * then allow partial matches. */
284 if (pc->prefix[len -1] == '*') {
285 if(!strncmp(pc->prefix, path, len - 1)) break;
286 } else if (plen == len){
287 if(!strncmp(pc->prefix, path, len)) break;
288 }
289 }
290 *uid = pc->uid;
291 *gid = pc->gid;
292 *mode = (*mode & (~07777)) | pc->mode;
293 *capabilities = pc->capabilities;
294
295 #if 0
296 fprintf(stderr,"< '%s' '%s' %d %d %o >\n",
297 path, pc->prefix ? pc->prefix : "", *uid, *gid, *mode);
298 #endif
299 }
300 #endif
301 #endif
302