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
76 #define AID_SHELL 2000 /* adb and debug shell user */
77 #define AID_CACHE 2001 /* cache access */
78 #define AID_DIAG 2002 /* access to diagnostic resources */
79
80 /* The 3000 series are intended for use as supplemental group id's only.
81 * They indicate special Android capabilities that the kernel is aware of. */
82 #define AID_NET_BT_ADMIN 3001 /* bluetooth: create any socket */
83 #define AID_NET_BT 3002 /* bluetooth: create sco, rfcomm or l2cap sockets */
84 #define AID_INET 3003 /* can create AF_INET and AF_INET6 sockets */
85 #define AID_NET_RAW 3004 /* can create raw INET sockets */
86 #define AID_NET_ADMIN 3005 /* can configure interfaces and routing tables. */
87 #define AID_NET_BW_STATS 3006 /* read bandwidth statistics */
88 #define AID_NET_BW_ACCT 3007 /* change bandwidth statistics accounting */
89 #define AID_NET_BT_STACK 3008 /* bluetooth: access config files */
90
91 #define AID_MISC 9998 /* access to misc storage */
92 #define AID_NOBODY 9999
93
94 #define AID_APP 10000 /* first app user */
95
96 #define AID_ISOLATED_START 99000 /* start of uids for fully isolated sandboxed processes */
97 #define AID_ISOLATED_END 99999 /* end of uids for fully isolated sandboxed processes */
98
99 #define AID_USER 100000 /* offset for uid ranges for each user */
100
101 #define AID_SHARED_GID_START 50000 /* start of gids for apps in each user to share */
102 #define AID_SHARED_GID_END 59999 /* start of gids for apps in each user to share */
103
104 #if !defined(EXCLUDE_FS_CONFIG_STRUCTURES)
105 struct android_id_info {
106 const char *name;
107 unsigned aid;
108 };
109
110 static const struct android_id_info android_ids[] = {
111 { "root", AID_ROOT, },
112 { "system", AID_SYSTEM, },
113 { "radio", AID_RADIO, },
114 { "bluetooth", AID_BLUETOOTH, },
115 { "graphics", AID_GRAPHICS, },
116 { "input", AID_INPUT, },
117 { "audio", AID_AUDIO, },
118 { "camera", AID_CAMERA, },
119 { "log", AID_LOG, },
120 { "compass", AID_COMPASS, },
121 { "mount", AID_MOUNT, },
122 { "wifi", AID_WIFI, },
123 { "dhcp", AID_DHCP, },
124 { "adb", AID_ADB, },
125 { "install", AID_INSTALL, },
126 { "media", AID_MEDIA, },
127 { "drm", AID_DRM, },
128 { "mdnsr", AID_MDNSR, },
129 { "nfc", AID_NFC, },
130 { "drmrpc", AID_DRMRPC, },
131 { "shell", AID_SHELL, },
132 { "cache", AID_CACHE, },
133 { "diag", AID_DIAG, },
134 { "net_bt_admin", AID_NET_BT_ADMIN, },
135 { "net_bt", AID_NET_BT, },
136 { "net_bt_stack", AID_NET_BT_STACK, },
137 { "sdcard_r", AID_SDCARD_R, },
138 { "sdcard_rw", AID_SDCARD_RW, },
139 { "media_rw", AID_MEDIA_RW, },
140 { "vpn", AID_VPN, },
141 { "keystore", AID_KEYSTORE, },
142 { "usb", AID_USB, },
143 { "mtp", AID_MTP, },
144 { "gps", AID_GPS, },
145 { "inet", AID_INET, },
146 { "net_raw", AID_NET_RAW, },
147 { "net_admin", AID_NET_ADMIN, },
148 { "net_bw_stats", AID_NET_BW_STATS, },
149 { "net_bw_acct", AID_NET_BW_ACCT, },
150 { "loop_radio", AID_LOOP_RADIO, },
151 { "misc", AID_MISC, },
152 { "nobody", AID_NOBODY, },
153 { "clat", AID_CLAT, },
154 { "mediadrm", AID_MEDIA_DRM, },
155 };
156
157 #define android_id_count \
158 (sizeof(android_ids) / sizeof(android_ids[0]))
159
160 struct fs_path_config {
161 unsigned mode;
162 unsigned uid;
163 unsigned gid;
164 uint64_t capabilities;
165 const char *prefix;
166 };
167
168 /* Rules for directories.
169 ** These rules are applied based on "first match", so they
170 ** should start with the most specific path and work their
171 ** way up to the root.
172 */
173
174 static const struct fs_path_config android_dirs[] = {
175 { 00770, AID_SYSTEM, AID_CACHE, 0, "cache" },
176 { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/app" },
177 { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/app-private" },
178 { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/dalvik-cache" },
179 { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/data" },
180 { 00771, AID_SHELL, AID_SHELL, 0, "data/local/tmp" },
181 { 00771, AID_SHELL, AID_SHELL, 0, "data/local" },
182 { 01771, AID_SYSTEM, AID_MISC, 0, "data/misc" },
183 { 00770, AID_DHCP, AID_DHCP, 0, "data/misc/dhcp" },
184 { 00775, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media" },
185 { 00775, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media/Music" },
186 { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data" },
187 { 00750, AID_ROOT, AID_SHELL, 0, "sbin" },
188 { 00755, AID_ROOT, AID_SHELL, 0, "system/bin" },
189 { 00755, AID_ROOT, AID_SHELL, 0, "system/vendor" },
190 { 00755, AID_ROOT, AID_SHELL, 0, "system/xbin" },
191 { 00755, AID_ROOT, AID_ROOT, 0, "system/etc/ppp" },
192 { 00755, AID_ROOT, AID_SHELL, 0, "vendor" },
193 { 00777, AID_ROOT, AID_ROOT, 0, "sdcard" },
194 { 00755, AID_ROOT, AID_ROOT, 0, 0 },
195 };
196
197 /* Rules for files.
198 ** These rules are applied based on "first match", so they
199 ** should start with the most specific path and work their
200 ** way up to the root. Prefixes ending in * denotes wildcard
201 ** and will allow partial matches.
202 */
203 static const struct fs_path_config android_files[] = {
204 { 00440, AID_ROOT, AID_SHELL, 0, "system/etc/init.goldfish.rc" },
205 { 00550, AID_ROOT, AID_SHELL, 0, "system/etc/init.goldfish.sh" },
206 { 00440, AID_ROOT, AID_SHELL, 0, "system/etc/init.trout.rc" },
207 { 00550, AID_ROOT, AID_SHELL, 0, "system/etc/init.ril" },
208 { 00550, AID_ROOT, AID_SHELL, 0, "system/etc/init.testmenu" },
209 { 00550, AID_DHCP, AID_SHELL, 0, "system/etc/dhcpcd/dhcpcd-run-hooks" },
210 { 00444, AID_RADIO, AID_AUDIO, 0, "system/etc/AudioPara4.csv" },
211 { 00555, AID_ROOT, AID_ROOT, 0, "system/etc/ppp/*" },
212 { 00555, AID_ROOT, AID_ROOT, 0, "system/etc/rc.*" },
213 { 00644, AID_SYSTEM, AID_SYSTEM, 0, "data/app/*" },
214 { 00644, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media/*" },
215 { 00644, AID_SYSTEM, AID_SYSTEM, 0, "data/app-private/*" },
216 { 00644, AID_APP, AID_APP, 0, "data/data/*" },
217 { 00755, AID_ROOT, AID_ROOT, 0, "system/bin/ping" },
218
219 /* the following file is INTENTIONALLY set-gid and not set-uid.
220 * Do not change. */
221 { 02750, AID_ROOT, AID_INET, 0, "system/bin/netcfg" },
222
223 /* the following five files are INTENTIONALLY set-uid, but they
224 * are NOT included on user builds. */
225 { 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/su" },
226 { 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/librank" },
227 { 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/procrank" },
228 { 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/procmem" },
229 { 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/tcpdump" },
230 { 04770, AID_ROOT, AID_RADIO, 0, "system/bin/pppd-ril" },
231
232 /* the following file has enhanced capabilities and IS included in user builds. */
233 { 00750, AID_ROOT, AID_SHELL, (1 << CAP_SETUID) | (1 << CAP_SETGID), "system/bin/run-as" },
234
235 { 00755, AID_ROOT, AID_SHELL, 0, "system/bin/*" },
236 { 00755, AID_ROOT, AID_ROOT, 0, "system/lib/valgrind/*" },
237 { 00755, AID_ROOT, AID_SHELL, 0, "system/xbin/*" },
238 { 00755, AID_ROOT, AID_SHELL, 0, "system/vendor/bin/*" },
239 { 00755, AID_ROOT, AID_SHELL, 0, "vendor/bin/*" },
240 { 00750, AID_ROOT, AID_SHELL, 0, "sbin/*" },
241 { 00755, AID_ROOT, AID_ROOT, 0, "bin/*" },
242 { 00750, AID_ROOT, AID_SHELL, 0, "init*" },
243 { 00750, AID_ROOT, AID_SHELL, 0, "charger*" },
244 { 00750, AID_ROOT, AID_SHELL, 0, "sbin/fs_mgr" },
245 { 00640, AID_ROOT, AID_SHELL, 0, "fstab.*" },
246 { 00644, AID_ROOT, AID_ROOT, 0, 0 },
247 };
248
fs_config(const char * path,int dir,unsigned * uid,unsigned * gid,unsigned * mode,uint64_t * capabilities)249 static inline void fs_config(const char *path, int dir,
250 unsigned *uid, unsigned *gid, unsigned *mode, uint64_t *capabilities)
251 {
252 const struct fs_path_config *pc;
253 int plen;
254
255 if (path[0] == '/') {
256 path++;
257 }
258
259 pc = dir ? android_dirs : android_files;
260 plen = strlen(path);
261 for(; pc->prefix; pc++){
262 int len = strlen(pc->prefix);
263 if (dir) {
264 if(plen < len) continue;
265 if(!strncmp(pc->prefix, path, len)) break;
266 continue;
267 }
268 /* If name ends in * then allow partial matches. */
269 if (pc->prefix[len -1] == '*') {
270 if(!strncmp(pc->prefix, path, len - 1)) break;
271 } else if (plen == len){
272 if(!strncmp(pc->prefix, path, len)) break;
273 }
274 }
275 *uid = pc->uid;
276 *gid = pc->gid;
277 *mode = (*mode & (~07777)) | pc->mode;
278 *capabilities = pc->capabilities;
279
280 #if 0
281 fprintf(stderr,"< '%s' '%s' %d %d %o >\n",
282 path, pc->prefix ? pc->prefix : "", *uid, *gid, *mode);
283 #endif
284 }
285 #endif
286 #endif
287