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      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 #define AID_LOGD          1036  /* log daemon */
     80 #define AID_SHARED_RELRO  1037  /* creator of shared GNU RELRO files */
     81 
     82 #define AID_SHELL         2000  /* adb and debug shell user */
     83 #define AID_CACHE         2001  /* cache access */
     84 #define AID_DIAG          2002  /* access to diagnostic resources */
     85 
     86 /* The 3000 series are intended for use as supplemental group id's only.
     87  * They indicate special Android capabilities that the kernel is aware of. */
     88 #define AID_NET_BT_ADMIN  3001  /* bluetooth: create any socket */
     89 #define AID_NET_BT        3002  /* bluetooth: create sco, rfcomm or l2cap sockets */
     90 #define AID_INET          3003  /* can create AF_INET and AF_INET6 sockets */
     91 #define AID_NET_RAW       3004  /* can create raw INET sockets */
     92 #define AID_NET_ADMIN     3005  /* can configure interfaces and routing tables. */
     93 #define AID_NET_BW_STATS  3006  /* read bandwidth statistics */
     94 #define AID_NET_BW_ACCT   3007  /* change bandwidth statistics accounting */
     95 #define AID_NET_BT_STACK  3008  /* bluetooth: access config files */
     96 
     97 #define AID_EVERYBODY     9997  /* shared between all apps in the same profile */
     98 #define AID_MISC          9998  /* access to misc storage */
     99 #define AID_NOBODY        9999
    100 
    101 #define AID_APP          10000  /* first app user */
    102 
    103 #define AID_ISOLATED_START 99000 /* start of uids for fully isolated sandboxed processes */
    104 #define AID_ISOLATED_END   99999 /* end of uids for fully isolated sandboxed processes */
    105 
    106 #define AID_USER        100000  /* offset for uid ranges for each user */
    107 
    108 #define AID_SHARED_GID_START 50000 /* start of gids for apps in each user to share */
    109 #define AID_SHARED_GID_END   59999 /* start of gids for apps in each user to share */
    110 
    111 #if !defined(EXCLUDE_FS_CONFIG_STRUCTURES)
    112 struct android_id_info {
    113     const char *name;
    114     unsigned aid;
    115 };
    116 
    117 static const struct android_id_info android_ids[] = {
    118     { "root",          AID_ROOT, },
    119 
    120     { "system",        AID_SYSTEM, },
    121 
    122     { "radio",         AID_RADIO, },
    123     { "bluetooth",     AID_BLUETOOTH, },
    124     { "graphics",      AID_GRAPHICS, },
    125     { "input",         AID_INPUT, },
    126     { "audio",         AID_AUDIO, },
    127     { "camera",        AID_CAMERA, },
    128     { "log",           AID_LOG, },
    129     { "compass",       AID_COMPASS, },
    130     { "mount",         AID_MOUNT, },
    131     { "wifi",          AID_WIFI, },
    132     { "adb",           AID_ADB, },
    133     { "install",       AID_INSTALL, },
    134     { "media",         AID_MEDIA, },
    135     { "dhcp",          AID_DHCP, },
    136     { "sdcard_rw",     AID_SDCARD_RW, },
    137     { "vpn",           AID_VPN, },
    138     { "keystore",      AID_KEYSTORE, },
    139     { "usb",           AID_USB, },
    140     { "drm",           AID_DRM, },
    141     { "mdnsr",         AID_MDNSR, },
    142     { "gps",           AID_GPS, },
    143     // AID_UNUSED1
    144     { "media_rw",      AID_MEDIA_RW, },
    145     { "mtp",           AID_MTP, },
    146     // AID_UNUSED2
    147     { "drmrpc",        AID_DRMRPC, },
    148     { "nfc",           AID_NFC, },
    149     { "sdcard_r",      AID_SDCARD_R, },
    150     { "clat",          AID_CLAT, },
    151     { "loop_radio",    AID_LOOP_RADIO, },
    152     { "mediadrm",      AID_MEDIA_DRM, },
    153     { "package_info",  AID_PACKAGE_INFO, },
    154     { "sdcard_pics",   AID_SDCARD_PICS, },
    155     { "sdcard_av",     AID_SDCARD_AV, },
    156     { "sdcard_all",    AID_SDCARD_ALL, },
    157     { "logd",          AID_LOGD, },
    158     { "shared_relro",  AID_SHARED_RELRO, },
    159 
    160     { "shell",         AID_SHELL, },
    161     { "cache",         AID_CACHE, },
    162     { "diag",          AID_DIAG, },
    163 
    164     { "net_bt_admin",  AID_NET_BT_ADMIN, },
    165     { "net_bt",        AID_NET_BT, },
    166     { "inet",          AID_INET, },
    167     { "net_raw",       AID_NET_RAW, },
    168     { "net_admin",     AID_NET_ADMIN, },
    169     { "net_bw_stats",  AID_NET_BW_STATS, },
    170     { "net_bw_acct",   AID_NET_BW_ACCT, },
    171     { "net_bt_stack",  AID_NET_BT_STACK, },
    172 
    173     { "everybody",     AID_EVERYBODY, },
    174     { "misc",          AID_MISC, },
    175     { "nobody",        AID_NOBODY, },
    176 };
    177 
    178 #define android_id_count \
    179     (sizeof(android_ids) / sizeof(android_ids[0]))
    180 
    181 struct fs_path_config {
    182     unsigned mode;
    183     unsigned uid;
    184     unsigned gid;
    185     uint64_t capabilities;
    186     const char *prefix;
    187 };
    188 
    189 /* Rules for directories.
    190 ** These rules are applied based on "first match", so they
    191 ** should start with the most specific path and work their
    192 ** way up to the root.
    193 */
    194 
    195 static const struct fs_path_config android_dirs[] = {
    196     { 00770, AID_SYSTEM, AID_CACHE,  0, "cache" },
    197     { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/app" },
    198     { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/app-private" },
    199     { 00771, AID_ROOT,   AID_ROOT,   0, "data/dalvik-cache" },
    200     { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/data" },
    201     { 00771, AID_SHELL,  AID_SHELL,  0, "data/local/tmp" },
    202     { 00771, AID_SHELL,  AID_SHELL,  0, "data/local" },
    203     { 01771, AID_SYSTEM, AID_MISC,   0, "data/misc" },
    204     { 00770, AID_DHCP,   AID_DHCP,   0, "data/misc/dhcp" },
    205     { 00771, AID_SHARED_RELRO, AID_SHARED_RELRO, 0, "data/misc/shared_relro" },
    206     { 00775, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media" },
    207     { 00775, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media/Music" },
    208     { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data" },
    209     { 00750, AID_ROOT,   AID_SHELL,  0, "sbin" },
    210     { 00755, AID_ROOT,   AID_SHELL,  0, "system/bin" },
    211     { 00755, AID_ROOT,   AID_SHELL,  0, "system/vendor" },
    212     { 00755, AID_ROOT,   AID_SHELL,  0, "system/xbin" },
    213     { 00755, AID_ROOT,   AID_ROOT,   0, "system/etc/ppp" },
    214     { 00755, AID_ROOT,   AID_SHELL,  0, "vendor" },
    215     { 00777, AID_ROOT,   AID_ROOT,   0, "sdcard" },
    216     { 00755, AID_ROOT,   AID_ROOT,   0, 0 },
    217 };
    218 
    219 /* Rules for files.
    220 ** These rules are applied based on "first match", so they
    221 ** should start with the most specific path and work their
    222 ** way up to the root. Prefixes ending in * denotes wildcard
    223 ** and will allow partial matches.
    224 */
    225 static const struct fs_path_config android_files[] = {
    226     { 00440, AID_ROOT,      AID_SHELL,     0, "system/etc/init.goldfish.rc" },
    227     { 00550, AID_ROOT,      AID_SHELL,     0, "system/etc/init.goldfish.sh" },
    228     { 00440, AID_ROOT,      AID_SHELL,     0, "system/etc/init.trout.rc" },
    229     { 00550, AID_ROOT,      AID_SHELL,     0, "system/etc/init.ril" },
    230     { 00550, AID_ROOT,      AID_SHELL,     0, "system/etc/init.testmenu" },
    231     { 00550, AID_DHCP,      AID_SHELL,     0, "system/etc/dhcpcd/dhcpcd-run-hooks" },
    232     { 00444, AID_RADIO,     AID_AUDIO,     0, "system/etc/AudioPara4.csv" },
    233     { 00555, AID_ROOT,      AID_ROOT,      0, "system/etc/ppp/*" },
    234     { 00555, AID_ROOT,      AID_ROOT,      0, "system/etc/rc.*" },
    235     { 00644, AID_SYSTEM,    AID_SYSTEM,    0, "data/app/*" },
    236     { 00644, AID_MEDIA_RW,  AID_MEDIA_RW,  0, "data/media/*" },
    237     { 00644, AID_SYSTEM,    AID_SYSTEM,    0, "data/app-private/*" },
    238     { 00644, AID_APP,       AID_APP,       0, "data/data/*" },
    239     { 00755, AID_ROOT,      AID_ROOT,      0, "system/bin/ping" },
    240 
    241     /* the following file is INTENTIONALLY set-gid and not set-uid.
    242      * Do not change. */
    243     { 02750, AID_ROOT,      AID_INET,      0, "system/bin/netcfg" },
    244 
    245     /* the following five files are INTENTIONALLY set-uid, but they
    246      * are NOT included on user builds. */
    247     { 04750, AID_ROOT,      AID_SHELL,     0, "system/xbin/su" },
    248     { 06755, AID_ROOT,      AID_ROOT,      0, "system/xbin/librank" },
    249     { 06755, AID_ROOT,      AID_ROOT,      0, "system/xbin/procrank" },
    250     { 06755, AID_ROOT,      AID_ROOT,      0, "system/xbin/procmem" },
    251     { 06755, AID_ROOT,      AID_ROOT,      0, "system/xbin/tcpdump" },
    252     { 04770, AID_ROOT,      AID_RADIO,     0, "system/bin/pppd-ril" },
    253 
    254     /* the following files have enhanced capabilities and ARE included in user builds. */
    255     { 00750, AID_ROOT,      AID_SHELL,     (1 << CAP_SETUID) | (1 << CAP_SETGID), "system/bin/run-as" },
    256 
    257     { 00750, AID_ROOT,      AID_ROOT,      0, "system/bin/uncrypt" },
    258     { 00750, AID_ROOT,      AID_ROOT,      0, "system/bin/install-recovery.sh" },
    259     { 00755, AID_ROOT,      AID_SHELL,     0, "system/bin/*" },
    260     { 00755, AID_ROOT,      AID_ROOT,      0, "system/lib/valgrind/*" },
    261     { 00755, AID_ROOT,      AID_ROOT,      0, "system/lib64/valgrind/*" },
    262     { 00755, AID_ROOT,      AID_SHELL,     0, "system/xbin/*" },
    263     { 00755, AID_ROOT,      AID_SHELL,     0, "system/vendor/bin/*" },
    264     { 00755, AID_ROOT,      AID_SHELL,     0, "vendor/bin/*" },
    265     { 00750, AID_ROOT,      AID_SHELL,     0, "sbin/*" },
    266     { 00755, AID_ROOT,      AID_ROOT,      0, "bin/*" },
    267     { 00750, AID_ROOT,      AID_SHELL,     0, "init*" },
    268     { 00750, AID_ROOT,      AID_SHELL,     0, "sbin/fs_mgr" },
    269     { 00640, AID_ROOT,      AID_SHELL,     0, "fstab.*" },
    270     { 00644, AID_ROOT,      AID_ROOT,      0, 0 },
    271 };
    272 
    273 static inline void fs_config(const char *path, int dir,
    274                              unsigned *uid, unsigned *gid, unsigned *mode, uint64_t *capabilities)
    275 {
    276     const struct fs_path_config *pc;
    277     int plen;
    278 
    279     if (path[0] == '/') {
    280         path++;
    281     }
    282 
    283     pc = dir ? android_dirs : android_files;
    284     plen = strlen(path);
    285     for(; pc->prefix; pc++){
    286         int len = strlen(pc->prefix);
    287         if (dir) {
    288             if(plen < len) continue;
    289             if(!strncmp(pc->prefix, path, len)) break;
    290             continue;
    291         }
    292         /* If name ends in * then allow partial matches. */
    293         if (pc->prefix[len -1] == '*') {
    294             if(!strncmp(pc->prefix, path, len - 1)) break;
    295         } else if (plen == len){
    296             if(!strncmp(pc->prefix, path, len)) break;
    297         }
    298     }
    299     *uid = pc->uid;
    300     *gid = pc->gid;
    301     *mode = (*mode & (~07777)) | pc->mode;
    302     *capabilities = pc->capabilities;
    303 
    304 #if 0
    305     fprintf(stderr,"< '%s' '%s' %d %d %o >\n",
    306             path, pc->prefix ? pc->prefix : "", *uid, *gid, *mode);
    307 #endif
    308 }
    309 #endif
    310 #endif
    311