1 /*
2 **
3 ** Copyright 2008, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 **     http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17 
18 #define LOG_TAG "installd"
19 
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <stdint.h>
23 #include <inttypes.h>
24 #include <sys/stat.h>
25 #include <dirent.h>
26 #include <unistd.h>
27 #include <ctype.h>
28 #include <fcntl.h>
29 #include <errno.h>
30 #include <utime.h>
31 #include <sys/socket.h>
32 #include <sys/types.h>
33 #include <sys/wait.h>
34 #include <string>
35 #include <vector>
36 
37 #include <cutils/fs.h>
38 #include <cutils/sockets.h>
39 #include <cutils/log.h>
40 #include <cutils/properties.h>
41 #include <cutils/multiuser.h>
42 
43 #include <private/android_filesystem_config.h>
44 
45 #if defined(__APPLE__)
46 #include <sys/mount.h>
47 #else
48 #include <sys/statfs.h>
49 #endif
50 
51 #define SOCKET_PATH "installd"
52 
53 
54 /* elements combined with a valid package name to form paths */
55 
56 #define PRIMARY_USER_PREFIX    "data/"
57 #define SECONDARY_USER_PREFIX  "user/"
58 
59 #define PKG_DIR_POSTFIX        ""
60 
61 #define PKG_LIB_POSTFIX        "/lib"
62 
63 #define CACHE_DIR_POSTFIX      "/cache"
64 #define CODE_CACHE_DIR_POSTFIX "/code_cache"
65 
66 #define APP_SUBDIR             "app/" // sub-directory under ANDROID_DATA
67 #define PRIV_APP_SUBDIR        "priv-app/" // sub-directory under ANDROID_DATA
68 
69 #define APP_LIB_SUBDIR         "app-lib/" // sub-directory under ANDROID_DATA
70 
71 #define MEDIA_SUBDIR           "media/" // sub-directory under ANDROID_DATA
72 
73 /* other handy constants */
74 
75 #define PRIVATE_APP_SUBDIR     "app-private/" // sub-directory under ANDROID_DATA
76 
77 #define DALVIK_CACHE_PREFIX    "/data/dalvik-cache/"
78 #define DALVIK_CACHE_POSTFIX   "/classes.dex"
79 
80 #define UPDATE_COMMANDS_DIR_PREFIX  "/system/etc/updatecmds/"
81 
82 #define IDMAP_PREFIX           "/data/resource-cache/"
83 #define IDMAP_SUFFIX           "@idmap"
84 
85 #define PKG_NAME_MAX  128   /* largest allowed package name */
86 #define PKG_PATH_MAX  256   /* max size of any path we use */
87 
88 /* dexopt needed flags matching those in dalvik.system.DexFile */
89 #define DEXOPT_DEX2OAT_NEEDED        1
90 #define DEXOPT_PATCHOAT_NEEDED       2
91 #define DEXOPT_SELF_PATCHOAT_NEEDED  3
92 
93 #define ARRAY_SIZE(a) (sizeof(a) / sizeof(*(a)))
94 
95 /* data structures */
96 
97 typedef struct {
98     char* path;
99     size_t len;
100 } dir_rec_t;
101 
102 typedef struct {
103     size_t count;
104     dir_rec_t* dirs;
105 } dir_rec_array_t;
106 
107 extern dir_rec_t android_app_dir;
108 extern dir_rec_t android_app_private_dir;
109 extern dir_rec_t android_app_lib_dir;
110 extern dir_rec_t android_data_dir;
111 extern dir_rec_t android_asec_dir;
112 extern dir_rec_t android_media_dir;
113 extern dir_rec_t android_mnt_expand_dir;
114 extern dir_rec_array_t android_system_dirs;
115 
116 typedef struct cache_dir_struct {
117     struct cache_dir_struct* parent;
118     int32_t childCount;
119     int32_t hiddenCount;
120     int32_t deleted;
121     char name[];
122 } cache_dir_t;
123 
124 typedef struct {
125     cache_dir_t* dir;
126     time_t modTime;
127     char name[];
128 } cache_file_t;
129 
130 typedef struct {
131     size_t numDirs;
132     size_t availDirs;
133     cache_dir_t** dirs;
134     size_t numFiles;
135     size_t availFiles;
136     cache_file_t** files;
137     size_t numCollected;
138     void* memBlocks;
139     int8_t* curMemBlockAvail;
140     int8_t* curMemBlockEnd;
141 } cache_t;
142 
143 /* util.c */
144 
145 int create_pkg_path(char path[PKG_PATH_MAX],
146                     const char *pkgname,
147                     const char *postfix,
148                     userid_t userid);
149 
150 std::string create_data_path(const char* volume_uuid);
151 
152 std::string create_data_app_path(const char* volume_uuid);
153 
154 std::string create_data_app_package_path(const char* volume_uuid, const char* package_name);
155 
156 std::string create_data_user_path(const char* volume_uuid, userid_t userid);
157 
158 std::string create_data_user_package_path(const char* volume_uuid,
159         userid_t user, const char* package_name);
160 
161 std::string create_data_media_path(const char* volume_uuid, userid_t userid);
162 
163 std::vector<userid_t> get_known_users(const char* volume_uuid);
164 
165 int create_user_config_path(char path[PKG_PATH_MAX], userid_t userid);
166 
167 int create_move_path(char path[PKG_PATH_MAX],
168                      const char* pkgname,
169                      const char* leaf,
170                      userid_t userid);
171 
172 int is_valid_package_name(const char* pkgname);
173 
174 int create_cache_path(char path[PKG_PATH_MAX], const char *src,
175                       const char *instruction_set);
176 
177 int delete_dir_contents(const char *pathname,
178                         int also_delete_dir,
179                         int (*exclusion_predicate)(const char *name, const int is_dir));
180 
181 int delete_dir_contents_fd(int dfd, const char *name);
182 
183 int copy_dir_files(const char *srcname, const char *dstname, uid_t owner, gid_t group);
184 
185 int lookup_media_dir(char basepath[PATH_MAX], const char *dir);
186 
187 int64_t data_disk_free(const std::string& data_path);
188 
189 cache_t* start_cache_collection();
190 
191 void add_cache_files(cache_t* cache, const char *basepath, const char *cachedir);
192 
193 void clear_cache_files(const std::string& data_path, cache_t* cache, int64_t free_size);
194 
195 void finish_cache_collection(cache_t* cache);
196 
197 int validate_system_app_path(const char* path);
198 
199 int get_path_from_env(dir_rec_t* rec, const char* var);
200 
201 int get_path_from_string(dir_rec_t* rec, const char* path);
202 
203 int copy_and_append(dir_rec_t* dst, const dir_rec_t* src, const char* suffix);
204 
205 int validate_apk_path(const char *path);
206 int validate_apk_path_subdirs(const char *path);
207 
208 int append_and_increment(char** dst, const char* src, size_t* dst_size);
209 
210 char *build_string2(const char *s1, const char *s2);
211 char *build_string3(const char *s1, const char *s2, const char *s3);
212 
213 int ensure_dir(const char* path, mode_t mode, uid_t uid, gid_t gid);
214 int ensure_media_user_dirs(const char* uuid, userid_t userid);
215 int ensure_config_user_dirs(userid_t userid);
216 int create_profile_file(const char *pkgname, gid_t gid);
217 void remove_profile_file(const char *pkgname);
218 
219 /* commands.c */
220 
221 int install(const char *uuid, const char *pkgname, uid_t uid, gid_t gid, const char *seinfo);
222 int uninstall(const char *uuid, const char *pkgname, userid_t userid);
223 int renamepkg(const char *oldpkgname, const char *newpkgname);
224 int fix_uid(const char *uuid, const char *pkgname, uid_t uid, gid_t gid);
225 int delete_user_data(const char *uuid, const char *pkgname, userid_t userid);
226 int make_user_data(const char *uuid, const char *pkgname, uid_t uid,
227         userid_t userid, const char* seinfo);
228 int copy_complete_app(const char* from_uuid, const char *to_uuid,
229         const char *package_name, const char *data_app_name, appid_t appid,
230         const char* seinfo);
231 int make_user_config(userid_t userid);
232 int delete_user(const char *uuid, userid_t userid);
233 int delete_cache(const char *uuid, const char *pkgname, userid_t userid);
234 int delete_code_cache(const char *uuid, const char *pkgname, userid_t userid);
235 int move_dex(const char *src, const char *dst, const char *instruction_set);
236 int rm_dex(const char *path, const char *instruction_set);
237 int protect(char *pkgname, gid_t gid);
238 int get_size(const char *uuid, const char *pkgname, int userid,
239         const char *apkpath, const char *libdirpath,
240         const char *fwdlock_apkpath, const char *asecpath,
241         const char *instruction_set, int64_t *codesize, int64_t *datasize,
242         int64_t *cachesize, int64_t *asecsize);
243 int free_cache(const char *uuid, int64_t free_size);
244 int dexopt(const char *apk_path, uid_t uid, bool is_public, const char *pkgName,
245            const char *instruction_set, int dexopt_needed, bool vm_safe_mode,
246            bool debuggable, const char* oat_dir);
247 int mark_boot_complete(const char *instruction_set);
248 int movefiles();
249 int linklib(const char* uuid, const char* pkgname, const char* asecLibDir, int userId);
250 int idmap(const char *target_path, const char *overlay_path, uid_t uid);
251 int restorecon_data(const char *uuid, const char* pkgName, const char* seinfo, uid_t uid);
252 int create_oat_dir(const char* oat_dir, const char *instruction_set);
253 int rm_package_dir(const char* apk_path);
254 int calculate_oat_file_path(char path[PKG_PATH_MAX], const char *oat_dir, const char *apk_path,
255                             const char *instruction_set);
256 int move_package_dir(char path[PKG_PATH_MAX], const char *oat_dir, const char *apk_path,
257                             const char *instruction_set);
258 int link_file(const char *relative_path, const char *from_base, const char *to_base);
259