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phh
Wednesday, March 10th, 2010 at 11:24:31am MST 

  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.  
  29. /* This is the master Users and Groups config for the platform.
  30. ** DO NOT EVER RENUMBER.
  31. */
  32.  
  33. #define AID_ROOT             0  /* traditional unix root user */
  34.  
  35. #define AID_SYSTEM        1000  /* system server */
  36.  
  37. #define AID_RADIO         1001  /* telephony subsystem, RIL */
  38. #define AID_BLUETOOTH     1002  /* bluetooth subsystem */
  39. #define AID_GRAPHICS      1003  /* graphics devices */
  40. #define AID_INPUT         1004  /* input devices */
  41. #define AID_AUDIO         1005  /* audio devices */
  42. #define AID_CAMERA        1006  /* camera devices */
  43. #define AID_LOG           1007  /* log devices */
  44. #define AID_COMPASS       1008  /* compass device */
  45. #define AID_MOUNT         1009  /* mountd socket */
  46. #define AID_WIFI          1010  /* wifi subsystem */
  47. #define AID_ADB           1011  /* android debug bridge (adbd) */
  48. #define AID_INSTALL       1012  /* group for installing packages */
  49. #define AID_MEDIA         1013  /* mediaserver process */
  50. #define AID_DHCP          1014  /* dhcp client */
  51. #define AID_SDCARD_RW     1015  /* external storage write access */
  52. #define AID_VPN           1016  /* vpn system */
  53. #define AID_KEYSTORE      1017  /* keystore subsystem */
  54.  
  55. #define AID_SHELL         2000  /* adb and debug shell user */
  56. #define AID_CACHE         2001  /* cache access */
  57. #define AID_DIAG          2002  /* access to diagnostic resources */
  58.  
  59. /* The 3000 series are intended for use as supplemental group id's only.
  60.  * They indicate special Android capabilities that the kernel is aware of. */
  61. #define AID_NET_BT_ADMIN  3001  /* bluetooth: create any socket */
  62. #define AID_NET_BT        3002  /* bluetooth: create sco, rfcomm or l2cap sockets */
  63. #define AID_INET          3003  /* can create AF_INET and AF_INET6 sockets */
  64. #define AID_NET_RAW       3004  /* can create raw INET sockets */
  65. #define AID_NET_ADMIN     3005  /* can configure interfaces and routing tables. */
  66.  
  67. #define AID_MISC          9998  /* access to misc storage */
  68. #define AID_NOBODY        9999
  69.  
  70. #define AID_APP          10000 /* first app user */
  71.  
  72. #if !defined(EXCLUDE_FS_CONFIG_STRUCTURES)
  73. struct android_id_info {
  74.     const char *name;
  75.     unsigned aid;
  76. };
  77.  
  78. static struct android_id_info android_ids[] = {
  79.     { "root",      AID_ROOT, },
  80.     { "system",    AID_SYSTEM, },
  81.     { "radio",     AID_RADIO, },
  82.     { "bluetooth", AID_BLUETOOTH, },
  83.     { "graphics",  AID_GRAPHICS, },
  84.     { "input",     AID_INPUT, },
  85.     { "audio",     AID_AUDIO, },
  86.     { "camera",    AID_CAMERA, },
  87.     { "log",       AID_LOG, },
  88.     { "compass",   AID_COMPASS, },
  89.     { "mount",     AID_MOUNT, },
  90.     { "wifi",      AID_WIFI, },
  91.     { "dhcp",      AID_DHCP, },
  92.     { "adb",       AID_ADB, },
  93.     { "install",   AID_INSTALL, },
  94.     { "media",     AID_MEDIA, },
  95.     { "shell",     AID_SHELL, },
  96.     { "cache",     AID_CACHE, },
  97.     { "diag",      AID_DIAG, },
  98.     { "net_bt_admin", AID_NET_BT_ADMIN, },
  99.     { "net_bt",    AID_NET_BT, },
  100.     { "sdcard_rw", AID_SDCARD_RW, },
  101.     { "vpn",       AID_VPN, },
  102.     { "keystore",  AID_KEYSTORE, },
  103.     { "inet",      AID_INET, },
  104.     { "net_raw",   AID_NET_RAW, },
  105.     { "net_admin", AID_NET_ADMIN, },
  106.     { "misc",      AID_MISC, },
  107.     { "nobody",    AID_NOBODY, },
  108. };
  109.  
  110. #define android_id_count \
  111.     (sizeof(android_ids) / sizeof(android_ids[0]))
  112.    
  113. struct fs_path_config {
  114.     unsigned mode;
  115.     unsigned uid;
  116.     unsigned gid;
  117.     const char *prefix;
  118. };
  119.  
  120. /* Rules for directories.
  121. ** These rules are applied based on "first match", so they
  122. ** should start with the most specific path and work their
  123. ** way up to the root.
  124. */
  125.  
  126. static struct fs_path_config android_dirs[] = {
  127.     { 00770, AID_SYSTEM, AID_CACHE,  "cache" },
  128.     { 00771, AID_SYSTEM, AID_SYSTEM, "data/app" },
  129.     { 00771, AID_SYSTEM, AID_SYSTEM, "data/app-private" },
  130.     { 00771, AID_SYSTEM, AID_SYSTEM, "data/dalvik-cache" },
  131.     { 00771, AID_SYSTEM, AID_SYSTEM, "data/data" },
  132.     { 00771, AID_SHELL,  AID_SHELL,  "data/local/tmp" },
  133.     { 00771, AID_SHELL,  AID_SHELL,  "data/local" },
  134.     { 01771, AID_SYSTEM, AID_MISC,   "data/misc" },
  135.     { 00770, AID_DHCP,   AID_DHCP,   "data/misc/dhcp" },
  136.     { 00771, AID_SYSTEM, AID_SYSTEM, "data" },
  137.     { 00750, AID_ROOT,   AID_SHELL,  "sbin" },
  138.     { 00755, AID_ROOT,   AID_SHELL,  "system/bin" },
  139.     { 00755, AID_ROOT,   AID_SHELL,  "system/xbin" },
  140.     { 00755, AID_ROOT,   AID_ROOT,   "system/etc/ppp" },
  141.     { 00777, AID_ROOT,   AID_ROOT,   "sdcard" },
  142.     { 00755, AID_ROOT,   AID_ROOT,   0 },
  143. };
  144.  
  145. /* Rules for files.
  146. ** These rules are applied based on "first match", so they
  147. ** should start with the most specific path and work their
  148. ** way up to the root. Prefixes ending in * denotes wildcard
  149. ** and will allow partial matches.
  150. */
  151. static struct fs_path_config android_files[] = {
  152.     { 00440, AID_ROOT,      AID_SHELL,     "system/etc/init.goldfish.rc" },
  153.     { 00550, AID_ROOT,      AID_SHELL,     "system/etc/init.goldfish.sh" },
  154.     { 00440, AID_ROOT,      AID_SHELL,     "system/etc/init.trout.rc" },
  155.     { 00550, AID_ROOT,      AID_SHELL,     "system/etc/init.ril" },
  156.     { 00550, AID_ROOT,      AID_SHELL,     "system/etc/init.testmenu" },
  157.     { 00550, AID_DHCP,      AID_SHELL,     "system/etc/dhcpcd/dhcpcd-run-hooks" },
  158.     { 00440, AID_BLUETOOTH, AID_BLUETOOTH, "system/etc/dbus.conf" },
  159.     { 00440, AID_BLUETOOTH, AID_BLUETOOTH, "system/etc/bluez/main.conf" },
  160.     { 00440, AID_BLUETOOTH, AID_BLUETOOTH, "system/etc/bluez/input.conf" },
  161.     { 00440, AID_BLUETOOTH, AID_BLUETOOTH, "system/etc/bluez/audio.conf" },
  162.     { 00444, AID_RADIO,     AID_AUDIO,     "system/etc/AudioPara4.csv" },
  163.     { 00555, AID_ROOT,      AID_ROOT,      "system/etc/ppp/*" },
  164.     { 00644, AID_SYSTEM,    AID_SYSTEM,    "data/app/*" },
  165.     { 00644, AID_SYSTEM,    AID_SYSTEM,    "data/app-private/*" },
  166.     { 00644, AID_APP,       AID_APP,       "data/data/*" },
  167.         /* the following two files are INTENTIONALLY set-gid and not set-uid.
  168.          * Do not change. */
  169.     { 02755, AID_ROOT,      AID_NET_RAW,   "system/bin/ping" },
  170.     { 02755, AID_ROOT,      AID_INET,      "system/bin/netcfg" },
  171.         /* the following four files are INTENTIONALLY set-uid, but they
  172.          * are NOT included on user builds. */
  173.     { 06755, AID_ROOT,      AID_ROOT,      "system/xbin/su" },
  174.     { 06755, AID_ROOT,      AID_ROOT,      "system/xbin/librank" },
  175.     { 06755, AID_ROOT,      AID_ROOT,      "system/xbin/procrank" },
  176.     { 06755, AID_ROOT,      AID_ROOT,      "system/xbin/procmem" },
  177.     { 06755, AID_ROOT,      AID_ROOT,      "system/xbin/tcpdump" },
  178.     { 00755, AID_ROOT,      AID_SHELL,     "system/bin/*" },
  179.     { 00755, AID_ROOT,      AID_SHELL,     "system/xbin/*" },
  180.     { 00750, AID_ROOT,      AID_SHELL,     "sbin/*" },
  181.     { 00755, AID_ROOT,      AID_ROOT,      "bin/*" },
  182.     { 00750, AID_ROOT,      AID_SHELL,     "init*" },
  183.     { 00644, AID_ROOT,      AID_ROOT,       0 },
  184. };
  185.  
  186. static inline void fs_config(const char *path, int dir,
  187.                              unsigned *uid, unsigned *gid, unsigned *mode)
  188. {
  189.     struct fs_path_config *pc;
  190.     int plen;
  191.    
  192.     pc = dir ? android_dirs : android_files;
  193.     plen = strlen(path);
  194.     for(; pc->prefix; pc++){
  195.         int len = strlen(pc->prefix);
  196.         if (dir) {
  197.             if(plen < len) continue;
  198.             if(!strncmp(pc->prefix, path, len)) break;
  199.             continue;
  200.         }
  201.         /* If name ends in * then allow partial matches. */
  202.         if (pc->prefix[len -1] == '*') {
  203.             if(!strncmp(pc->prefix, path, len - 1)) break;
  204.         } else if (plen == len){
  205.             if(!strncmp(pc->prefix, path, len)) break;
  206.         }
  207.     }
  208.     *uid = pc->uid;
  209.     *gid = pc->gid;
  210.     *mode = (*mode & (~07777)) | pc->mode;
  211.    
  212. #if 0
  213.     fprintf(stderr,"< '%s' '%s' %d %d %o >\n",
  214.             path, pc->prefix ? pc->prefix : "", *uid, *gid, *mode);
  215. #endif
  216. }
  217. #endif
  218. #endif

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