610 lines
18 KiB
C
610 lines
18 KiB
C
/*
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** Copyright 2008, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#include <sys/capability.h>
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#include <linux/prctl.h>
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#include <selinux/android.h>
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#include <selinux/avc.h>
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#include "installd.h"
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#define BUFFER_MAX 1024 /* input buffer for commands */
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#define TOKEN_MAX 8 /* max number of arguments in buffer */
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#define REPLY_MAX 256 /* largest reply allowed */
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static int do_ping(char **arg, char reply[REPLY_MAX])
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{
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return 0;
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}
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static int do_install(char **arg, char reply[REPLY_MAX])
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{
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return install(arg[0], atoi(arg[1]), atoi(arg[2]), arg[3]); /* pkgname, uid, gid, seinfo */
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}
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static int do_dexopt(char **arg, char reply[REPLY_MAX])
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{
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/* apk_path, uid, is_public */
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return dexopt(arg[0], atoi(arg[1]), atoi(arg[2]));
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}
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static int do_move_dex(char **arg, char reply[REPLY_MAX])
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{
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return move_dex(arg[0], arg[1]); /* src, dst */
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}
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static int do_rm_dex(char **arg, char reply[REPLY_MAX])
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{
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return rm_dex(arg[0]); /* pkgname */
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}
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static int do_remove(char **arg, char reply[REPLY_MAX])
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{
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return uninstall(arg[0], atoi(arg[1])); /* pkgname, userid */
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}
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static int do_rename(char **arg, char reply[REPLY_MAX])
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{
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return renamepkg(arg[0], arg[1]); /* oldpkgname, newpkgname */
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}
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static int do_fixuid(char **arg, char reply[REPLY_MAX])
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{
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return fix_uid(arg[0], atoi(arg[1]), atoi(arg[2])); /* pkgname, uid, gid */
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}
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static int do_free_cache(char **arg, char reply[REPLY_MAX]) /* TODO int:free_size */
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{
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return free_cache((int64_t)atoll(arg[0])); /* free_size */
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}
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static int do_rm_cache(char **arg, char reply[REPLY_MAX])
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{
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return delete_cache(arg[0], atoi(arg[1])); /* pkgname, userid */
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}
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static int do_get_size(char **arg, char reply[REPLY_MAX])
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{
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int64_t codesize = 0;
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int64_t datasize = 0;
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int64_t cachesize = 0;
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int64_t asecsize = 0;
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int res = 0;
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/* pkgdir, userid, apkpath */
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res = get_size(arg[0], atoi(arg[1]), arg[2], arg[3], arg[4], arg[5],
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&codesize, &datasize, &cachesize, &asecsize);
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/*
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* Each int64_t can take up 22 characters printed out. Make sure it
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* doesn't go over REPLY_MAX in the future.
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*/
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snprintf(reply, REPLY_MAX, "%" PRId64 " %" PRId64 " %" PRId64 " %" PRId64,
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codesize, datasize, cachesize, asecsize);
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return res;
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}
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static int do_rm_user_data(char **arg, char reply[REPLY_MAX])
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{
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return delete_user_data(arg[0], atoi(arg[1])); /* pkgname, userid */
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}
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static int do_mk_user_data(char **arg, char reply[REPLY_MAX])
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{
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return make_user_data(arg[0], atoi(arg[1]), atoi(arg[2]), arg[3]);
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/* pkgname, uid, userid, seinfo */
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}
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static int do_rm_user(char **arg, char reply[REPLY_MAX])
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{
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return delete_user(atoi(arg[0])); /* userid */
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}
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static int do_movefiles(char **arg, char reply[REPLY_MAX])
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{
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return movefiles();
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}
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static int do_linklib(char **arg, char reply[REPLY_MAX])
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{
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return linklib(arg[0], arg[1], atoi(arg[2]));
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}
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static int do_idmap(char **arg, char reply[REPLY_MAX])
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{
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return idmap(arg[0], arg[1], atoi(arg[2]));
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}
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struct cmdinfo {
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const char *name;
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unsigned numargs;
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int (*func)(char **arg, char reply[REPLY_MAX]);
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};
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struct cmdinfo cmds[] = {
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{ "ping", 0, do_ping },
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{ "install", 4, do_install },
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{ "dexopt", 3, do_dexopt },
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{ "movedex", 2, do_move_dex },
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{ "rmdex", 1, do_rm_dex },
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{ "remove", 2, do_remove },
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{ "rename", 2, do_rename },
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{ "fixuid", 3, do_fixuid },
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{ "freecache", 1, do_free_cache },
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{ "rmcache", 2, do_rm_cache },
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{ "getsize", 6, do_get_size },
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{ "rmuserdata", 2, do_rm_user_data },
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{ "movefiles", 0, do_movefiles },
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{ "linklib", 3, do_linklib },
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{ "mkuserdata", 4, do_mk_user_data },
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{ "rmuser", 1, do_rm_user },
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{ "idmap", 3, do_idmap },
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};
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static int readx(int s, void *_buf, int count)
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{
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char *buf = _buf;
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int n = 0, r;
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if (count < 0) return -1;
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while (n < count) {
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r = read(s, buf + n, count - n);
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if (r < 0) {
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if (errno == EINTR) continue;
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ALOGE("read error: %s\n", strerror(errno));
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return -1;
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}
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if (r == 0) {
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ALOGE("eof\n");
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return -1; /* EOF */
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}
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n += r;
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}
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return 0;
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}
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static int writex(int s, const void *_buf, int count)
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{
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const char *buf = _buf;
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int n = 0, r;
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if (count < 0) return -1;
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while (n < count) {
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r = write(s, buf + n, count - n);
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if (r < 0) {
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if (errno == EINTR) continue;
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ALOGE("write error: %s\n", strerror(errno));
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return -1;
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}
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n += r;
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}
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return 0;
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}
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/* Tokenize the command buffer, locate a matching command,
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* ensure that the required number of arguments are provided,
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* call the function(), return the result.
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*/
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static int execute(int s, char cmd[BUFFER_MAX])
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{
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char reply[REPLY_MAX];
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char *arg[TOKEN_MAX+1];
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unsigned i;
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unsigned n = 0;
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unsigned short count;
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int ret = -1;
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// ALOGI("execute('%s')\n", cmd);
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/* default reply is "" */
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reply[0] = 0;
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/* n is number of args (not counting arg[0]) */
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arg[0] = cmd;
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while (*cmd) {
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if (isspace(*cmd)) {
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*cmd++ = 0;
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n++;
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arg[n] = cmd;
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if (n == TOKEN_MAX) {
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ALOGE("too many arguments\n");
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goto done;
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}
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}
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cmd++;
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}
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for (i = 0; i < sizeof(cmds) / sizeof(cmds[0]); i++) {
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if (!strcmp(cmds[i].name,arg[0])) {
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if (n != cmds[i].numargs) {
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ALOGE("%s requires %d arguments (%d given)\n",
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cmds[i].name, cmds[i].numargs, n);
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} else {
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ret = cmds[i].func(arg + 1, reply);
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}
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goto done;
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}
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}
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ALOGE("unsupported command '%s'\n", arg[0]);
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done:
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if (reply[0]) {
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n = snprintf(cmd, BUFFER_MAX, "%d %s", ret, reply);
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} else {
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n = snprintf(cmd, BUFFER_MAX, "%d", ret);
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}
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if (n > BUFFER_MAX) n = BUFFER_MAX;
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count = n;
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// ALOGI("reply: '%s'\n", cmd);
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if (writex(s, &count, sizeof(count))) return -1;
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if (writex(s, cmd, count)) return -1;
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return 0;
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}
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/**
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* Initialize all the global variables that are used elsewhere. Returns 0 upon
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* success and -1 on error.
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*/
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void free_globals() {
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size_t i;
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for (i = 0; i < android_system_dirs.count; i++) {
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if (android_system_dirs.dirs[i].path != NULL) {
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free(android_system_dirs.dirs[i].path);
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}
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}
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free(android_system_dirs.dirs);
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}
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int initialize_globals() {
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// Get the android data directory.
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if (get_path_from_env(&android_data_dir, "ANDROID_DATA") < 0) {
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return -1;
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}
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// Get the android app directory.
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if (copy_and_append(&android_app_dir, &android_data_dir, APP_SUBDIR) < 0) {
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return -1;
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}
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// Get the android protected app directory.
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if (copy_and_append(&android_app_private_dir, &android_data_dir, PRIVATE_APP_SUBDIR) < 0) {
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return -1;
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}
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// Get the android app native library directory.
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if (copy_and_append(&android_app_lib_dir, &android_data_dir, APP_LIB_SUBDIR) < 0) {
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return -1;
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}
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// Get the sd-card ASEC mount point.
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if (get_path_from_env(&android_asec_dir, "ASEC_MOUNTPOINT") < 0) {
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return -1;
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}
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// Get the android media directory.
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if (copy_and_append(&android_media_dir, &android_data_dir, MEDIA_SUBDIR) < 0) {
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return -1;
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}
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// Take note of the system and vendor directories.
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android_system_dirs.count = 2;
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android_system_dirs.dirs = calloc(android_system_dirs.count, sizeof(dir_rec_t));
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if (android_system_dirs.dirs == NULL) {
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ALOGE("Couldn't allocate array for dirs; aborting\n");
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return -1;
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}
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// system
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if (get_path_from_env(&android_system_dirs.dirs[0], "ANDROID_ROOT") < 0) {
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free_globals();
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return -1;
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}
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// append "app/" to dirs[0]
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char *system_app_path = build_string2(android_system_dirs.dirs[0].path, APP_SUBDIR);
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android_system_dirs.dirs[0].path = system_app_path;
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android_system_dirs.dirs[0].len = strlen(system_app_path);
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// vendor
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// TODO replace this with an environment variable (doesn't exist yet)
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android_system_dirs.dirs[1].path = "/vendor/app/";
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android_system_dirs.dirs[1].len = strlen(android_system_dirs.dirs[1].path);
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return 0;
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}
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int initialize_directories() {
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int res = -1;
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// Read current filesystem layout version to handle upgrade paths
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char version_path[PATH_MAX];
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snprintf(version_path, PATH_MAX, "%s.layout_version", android_data_dir.path);
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int oldVersion;
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if (fs_read_atomic_int(version_path, &oldVersion) == -1) {
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oldVersion = 0;
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}
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int version = oldVersion;
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// /data/user
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char *user_data_dir = build_string2(android_data_dir.path, SECONDARY_USER_PREFIX);
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// /data/data
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char *legacy_data_dir = build_string2(android_data_dir.path, PRIMARY_USER_PREFIX);
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// /data/user/0
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char *primary_data_dir = build_string3(android_data_dir.path, SECONDARY_USER_PREFIX, "0");
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if (!user_data_dir || !legacy_data_dir || !primary_data_dir) {
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goto fail;
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}
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// Make the /data/user directory if necessary
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if (access(user_data_dir, R_OK) < 0) {
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if (mkdir(user_data_dir, 0711) < 0) {
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goto fail;
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}
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if (chown(user_data_dir, AID_SYSTEM, AID_SYSTEM) < 0) {
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goto fail;
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}
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if (chmod(user_data_dir, 0711) < 0) {
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goto fail;
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}
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}
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// Make the /data/user/0 symlink to /data/data if necessary
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if (access(primary_data_dir, R_OK) < 0) {
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if (symlink(legacy_data_dir, primary_data_dir)) {
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goto fail;
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}
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}
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if (version == 0) {
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// Introducing multi-user, so migrate /data/media contents into /data/media/0
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ALOGD("Upgrading /data/media for multi-user");
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// Ensure /data/media
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if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
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goto fail;
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}
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// /data/media.tmp
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char media_tmp_dir[PATH_MAX];
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snprintf(media_tmp_dir, PATH_MAX, "%smedia.tmp", android_data_dir.path);
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// Only copy when upgrade not already in progress
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if (access(media_tmp_dir, F_OK) == -1) {
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if (rename(android_media_dir.path, media_tmp_dir) == -1) {
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ALOGE("Failed to move legacy media path: %s", strerror(errno));
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goto fail;
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}
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}
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// Create /data/media again
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if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
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goto fail;
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}
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if (selinux_android_restorecon(android_media_dir.path, 0)) {
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goto fail;
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}
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// /data/media/0
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char owner_media_dir[PATH_MAX];
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snprintf(owner_media_dir, PATH_MAX, "%s0", android_media_dir.path);
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// Move any owner data into place
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if (access(media_tmp_dir, F_OK) == 0) {
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if (rename(media_tmp_dir, owner_media_dir) == -1) {
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ALOGE("Failed to move owner media path: %s", strerror(errno));
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goto fail;
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}
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}
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// Ensure media directories for any existing users
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DIR *dir;
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struct dirent *dirent;
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char user_media_dir[PATH_MAX];
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dir = opendir(user_data_dir);
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if (dir != NULL) {
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while ((dirent = readdir(dir))) {
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if (dirent->d_type == DT_DIR) {
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const char *name = dirent->d_name;
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// skip "." and ".."
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if (name[0] == '.') {
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if (name[1] == 0) continue;
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if ((name[1] == '.') && (name[2] == 0)) continue;
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}
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// /data/media/<user_id>
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snprintf(user_media_dir, PATH_MAX, "%s%s", android_media_dir.path, name);
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if (fs_prepare_dir(user_media_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
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goto fail;
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}
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}
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}
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closedir(dir);
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}
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version = 1;
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}
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// /data/media/obb
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char media_obb_dir[PATH_MAX];
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snprintf(media_obb_dir, PATH_MAX, "%sobb", android_media_dir.path);
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if (version == 1) {
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// Introducing /data/media/obb for sharing OBB across users; migrate
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// any existing OBB files from owner.
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ALOGD("Upgrading to shared /data/media/obb");
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// /data/media/0/Android/obb
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char owner_obb_path[PATH_MAX];
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snprintf(owner_obb_path, PATH_MAX, "%s0/Android/obb", android_media_dir.path);
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// Only move if target doesn't already exist
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if (access(media_obb_dir, F_OK) != 0 && access(owner_obb_path, F_OK) == 0) {
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if (rename(owner_obb_path, media_obb_dir) == -1) {
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ALOGE("Failed to move OBB from owner: %s", strerror(errno));
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goto fail;
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}
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}
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version = 2;
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}
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if (ensure_media_user_dirs(0) == -1) {
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ALOGE("Failed to setup media for user 0");
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goto fail;
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}
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if (fs_prepare_dir(media_obb_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
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goto fail;
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}
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// Persist layout version if changed
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if (version != oldVersion) {
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if (fs_write_atomic_int(version_path, version) == -1) {
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ALOGE("Failed to save version to %s: %s", version_path, strerror(errno));
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goto fail;
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}
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}
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// Success!
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res = 0;
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fail:
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free(user_data_dir);
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free(legacy_data_dir);
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free(primary_data_dir);
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return res;
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}
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static void drop_privileges() {
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if (prctl(PR_SET_KEEPCAPS, 1) < 0) {
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ALOGE("prctl(PR_SET_KEEPCAPS) failed: %s\n", strerror(errno));
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exit(1);
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}
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if (setgid(AID_INSTALL) < 0) {
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ALOGE("setgid() can't drop privileges; exiting.\n");
|
|
exit(1);
|
|
}
|
|
|
|
if (setuid(AID_INSTALL) < 0) {
|
|
ALOGE("setuid() can't drop privileges; exiting.\n");
|
|
exit(1);
|
|
}
|
|
|
|
struct __user_cap_header_struct capheader;
|
|
struct __user_cap_data_struct capdata[2];
|
|
memset(&capheader, 0, sizeof(capheader));
|
|
memset(&capdata, 0, sizeof(capdata));
|
|
capheader.version = _LINUX_CAPABILITY_VERSION_3;
|
|
capheader.pid = 0;
|
|
|
|
capdata[CAP_TO_INDEX(CAP_DAC_OVERRIDE)].permitted |= CAP_TO_MASK(CAP_DAC_OVERRIDE);
|
|
capdata[CAP_TO_INDEX(CAP_CHOWN)].permitted |= CAP_TO_MASK(CAP_CHOWN);
|
|
capdata[CAP_TO_INDEX(CAP_SETUID)].permitted |= CAP_TO_MASK(CAP_SETUID);
|
|
capdata[CAP_TO_INDEX(CAP_SETGID)].permitted |= CAP_TO_MASK(CAP_SETGID);
|
|
capdata[CAP_TO_INDEX(CAP_FOWNER)].permitted |= CAP_TO_MASK(CAP_FOWNER);
|
|
|
|
capdata[0].effective = capdata[0].permitted;
|
|
capdata[1].effective = capdata[1].permitted;
|
|
capdata[0].inheritable = 0;
|
|
capdata[1].inheritable = 0;
|
|
|
|
if (capset(&capheader, &capdata[0]) < 0) {
|
|
ALOGE("capset failed: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
int main(const int argc, const char *argv[]) {
|
|
char buf[BUFFER_MAX];
|
|
struct sockaddr addr;
|
|
socklen_t alen;
|
|
int lsocket, s, count;
|
|
int selinux_enabled = (is_selinux_enabled() > 0);
|
|
|
|
ALOGI("installd firing up\n");
|
|
|
|
if (initialize_globals() < 0) {
|
|
ALOGE("Could not initialize globals; exiting.\n");
|
|
exit(1);
|
|
}
|
|
|
|
if (initialize_directories() < 0) {
|
|
ALOGE("Could not create directories; exiting.\n");
|
|
exit(1);
|
|
}
|
|
|
|
if (selinux_enabled && selinux_status_open(true) < 0) {
|
|
ALOGE("Could not open selinux status; exiting.\n");
|
|
exit(1);
|
|
}
|
|
|
|
drop_privileges();
|
|
|
|
lsocket = android_get_control_socket(SOCKET_PATH);
|
|
if (lsocket < 0) {
|
|
ALOGE("Failed to get socket from environment: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
if (listen(lsocket, 5)) {
|
|
ALOGE("Listen on socket failed: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
fcntl(lsocket, F_SETFD, FD_CLOEXEC);
|
|
|
|
for (;;) {
|
|
alen = sizeof(addr);
|
|
s = accept(lsocket, &addr, &alen);
|
|
if (s < 0) {
|
|
ALOGE("Accept failed: %s\n", strerror(errno));
|
|
continue;
|
|
}
|
|
fcntl(s, F_SETFD, FD_CLOEXEC);
|
|
|
|
ALOGI("new connection\n");
|
|
for (;;) {
|
|
unsigned short count;
|
|
if (readx(s, &count, sizeof(count))) {
|
|
ALOGE("failed to read size\n");
|
|
break;
|
|
}
|
|
if ((count < 1) || (count >= BUFFER_MAX)) {
|
|
ALOGE("invalid size %d\n", count);
|
|
break;
|
|
}
|
|
if (readx(s, buf, count)) {
|
|
ALOGE("failed to read command\n");
|
|
break;
|
|
}
|
|
buf[count] = 0;
|
|
if (selinux_enabled && selinux_status_updated() > 0) {
|
|
selinux_android_seapp_context_reload();
|
|
}
|
|
if (execute(s, buf)) break;
|
|
}
|
|
ALOGI("closing connection\n");
|
|
close(s);
|
|
}
|
|
|
|
return 0;
|
|
}
|