diff --git a/libcutils/Android.mk b/libcutils/Android.mk index d4450c619..c636196e6 100644 --- a/libcutils/Android.mk +++ b/libcutils/Android.mk @@ -32,6 +32,7 @@ commonSources := \ sched_policy.c \ iosched_policy.c \ str_parms.c \ + fs_config.c # some files must not be compiled when building against Mingw # they correspond to features not used by our host development tools diff --git a/libcutils/fs_config.c b/libcutils/fs_config.c new file mode 100644 index 000000000..3f6a20204 --- /dev/null +++ b/libcutils/fs_config.c @@ -0,0 +1,145 @@ +/* + * Copyright (C) 2007 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/* This file is used to define the properties of the filesystem +** images generated by build tools (mkbootfs and mkyaffs2image) and +** by the device side of adb. +*/ + +#define EXCLUDE_FS_CONFIG_STRUCTURES + +#include +#include +#include + +#include + +/* Temporary while EXCLUDE_FS_CONFIG_STRUCTURES is defined */ +struct fs_path_config { + unsigned mode; + unsigned uid; + unsigned gid; + uint64_t capabilities; + const char *prefix; +}; + +/* Rules for directories. +** These rules are applied based on "first match", so they +** should start with the most specific path and work their +** way up to the root. +*/ + +static const struct fs_path_config android_dirs[] = { + { 00770, AID_SYSTEM, AID_CACHE, 0, "cache" }, + { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/app" }, + { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/app-private" }, + { 00771, AID_ROOT, AID_ROOT, 0, "data/dalvik-cache" }, + { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/data" }, + { 00771, AID_SHELL, AID_SHELL, 0, "data/local/tmp" }, + { 00771, AID_SHELL, AID_SHELL, 0, "data/local" }, + { 01771, AID_SYSTEM, AID_MISC, 0, "data/misc" }, + { 00770, AID_DHCP, AID_DHCP, 0, "data/misc/dhcp" }, + { 00771, AID_SHARED_RELRO, AID_SHARED_RELRO, 0, "data/misc/shared_relro" }, + { 00775, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media" }, + { 00775, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media/Music" }, + { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data" }, + { 00750, AID_ROOT, AID_SHELL, 0, "sbin" }, + { 00755, AID_ROOT, AID_SHELL, 0, "system/bin" }, + { 00755, AID_ROOT, AID_SHELL, 0, "system/vendor" }, + { 00755, AID_ROOT, AID_SHELL, 0, "system/xbin" }, + { 00755, AID_ROOT, AID_ROOT, 0, "system/etc/ppp" }, + { 00755, AID_ROOT, AID_SHELL, 0, "vendor" }, + { 00777, AID_ROOT, AID_ROOT, 0, "sdcard" }, + { 00755, AID_ROOT, AID_ROOT, 0, 0 }, +}; + +/* Rules for files. +** These rules are applied based on "first match", so they +** should start with the most specific path and work their +** way up to the root. Prefixes ending in * denotes wildcard +** and will allow partial matches. +*/ +static const struct fs_path_config android_files[] = { + { 00440, AID_ROOT, AID_SHELL, 0, "system/etc/init.goldfish.rc" }, + { 00550, AID_ROOT, AID_SHELL, 0, "system/etc/init.goldfish.sh" }, + { 00550, AID_ROOT, AID_SHELL, 0, "system/etc/init.ril" }, + { 00550, AID_DHCP, AID_SHELL, 0, "system/etc/dhcpcd/dhcpcd-run-hooks" }, + { 00555, AID_ROOT, AID_ROOT, 0, "system/etc/ppp/*" }, + { 00555, AID_ROOT, AID_ROOT, 0, "system/etc/rc.*" }, + { 00644, AID_SYSTEM, AID_SYSTEM, 0, "data/app/*" }, + { 00644, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media/*" }, + { 00644, AID_SYSTEM, AID_SYSTEM, 0, "data/app-private/*" }, + { 00644, AID_APP, AID_APP, 0, "data/data/*" }, + + /* the following five files are INTENTIONALLY set-uid, but they + * are NOT included on user builds. */ + { 04750, AID_ROOT, AID_SHELL, 0, "system/xbin/su" }, + { 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/librank" }, + { 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/procrank" }, + { 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/procmem" }, + { 04770, AID_ROOT, AID_RADIO, 0, "system/bin/pppd-ril" }, + + /* the following files have enhanced capabilities and ARE included in user builds. */ + { 00750, AID_ROOT, AID_SHELL, (1ULL << CAP_SETUID) | (1ULL << CAP_SETGID), "system/bin/run-as" }, + { 00700, AID_SYSTEM, AID_SHELL, (1ULL << CAP_BLOCK_SUSPEND), "system/bin/inputflinger" }, + + { 00750, AID_ROOT, AID_ROOT, 0, "system/bin/uncrypt" }, + { 00750, AID_ROOT, AID_ROOT, 0, "system/bin/install-recovery.sh" }, + { 00755, AID_ROOT, AID_SHELL, 0, "system/bin/*" }, + { 00755, AID_ROOT, AID_ROOT, 0, "system/lib/valgrind/*" }, + { 00755, AID_ROOT, AID_ROOT, 0, "system/lib64/valgrind/*" }, + { 00755, AID_ROOT, AID_SHELL, 0, "system/xbin/*" }, + { 00755, AID_ROOT, AID_SHELL, 0, "system/vendor/bin/*" }, + { 00755, AID_ROOT, AID_SHELL, 0, "vendor/bin/*" }, + { 00750, AID_ROOT, AID_SHELL, 0, "sbin/*" }, + { 00755, AID_ROOT, AID_ROOT, 0, "bin/*" }, + { 00750, AID_ROOT, AID_SHELL, 0, "init*" }, + { 00750, AID_ROOT, AID_SHELL, 0, "sbin/fs_mgr" }, + { 00640, AID_ROOT, AID_SHELL, 0, "fstab.*" }, + { 00644, AID_ROOT, AID_ROOT, 0, 0 }, +}; + +void fs_config(const char *path, int dir, + unsigned *uid, unsigned *gid, unsigned *mode, uint64_t *capabilities) +{ + const struct fs_path_config *pc; + int plen; + + if (path[0] == '/') { + path++; + } + + pc = dir ? android_dirs : android_files; + plen = strlen(path); + for(; pc->prefix; pc++){ + int len = strlen(pc->prefix); + if (dir) { + if(plen < len) continue; + if(!strncmp(pc->prefix, path, len)) break; + continue; + } + /* If name ends in * then allow partial matches. */ + if (pc->prefix[len -1] == '*') { + if(!strncmp(pc->prefix, path, len - 1)) break; + } else if (plen == len){ + if(!strncmp(pc->prefix, path, len)) break; + } + } + *uid = pc->uid; + *gid = pc->gid; + *mode = (*mode & (~07777)) | pc->mode; + *capabilities = pc->capabilities; +}