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replicant-frameworks_native/cmds/installd/installd.c
Stephen Smalley 47a351834f restorecon /data/media when re-creating it for multi-user upgrade. 
Change-Id: I112c61863f2104d1962697c54cff25106e9b48a0
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2013-12-17 16:04:20 -05:00

603 lines
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/*
** Copyright 2008, 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.
*/
#include <sys/capability.h>
#include <linux/prctl.h>
#include <selinux/android.h>
#include <selinux/avc.h>
#include "installd.h"
#define BUFFER_MAX 1024 /* input buffer for commands */
#define TOKEN_MAX 8 /* max number of arguments in buffer */
#define REPLY_MAX 256 /* largest reply allowed */
static int do_ping(char **arg, char reply[REPLY_MAX])
{
return 0;
}
static int do_install(char **arg, char reply[REPLY_MAX])
{
return install(arg[0], atoi(arg[1]), atoi(arg[2]), arg[3]); /* pkgname, uid, gid, seinfo */
}
static int do_dexopt(char **arg, char reply[REPLY_MAX])
{
/* apk_path, uid, is_public */
return dexopt(arg[0], atoi(arg[1]), atoi(arg[2]));
}
static int do_move_dex(char **arg, char reply[REPLY_MAX])
{
return move_dex(arg[0], arg[1]); /* src, dst */
}
static int do_rm_dex(char **arg, char reply[REPLY_MAX])
{
return rm_dex(arg[0]); /* pkgname */
}
static int do_remove(char **arg, char reply[REPLY_MAX])
{
return uninstall(arg[0], atoi(arg[1])); /* pkgname, userid */
}
static int do_rename(char **arg, char reply[REPLY_MAX])
{
return renamepkg(arg[0], arg[1]); /* oldpkgname, newpkgname */
}
static int do_fixuid(char **arg, char reply[REPLY_MAX])
{
return fix_uid(arg[0], atoi(arg[1]), atoi(arg[2])); /* pkgname, uid, gid */
}
static int do_free_cache(char **arg, char reply[REPLY_MAX]) /* TODO int:free_size */
{
return free_cache((int64_t)atoll(arg[0])); /* free_size */
}
static int do_rm_cache(char **arg, char reply[REPLY_MAX])
{
return delete_cache(arg[0], atoi(arg[1])); /* pkgname, userid */
}
static int do_get_size(char **arg, char reply[REPLY_MAX])
{
int64_t codesize = 0;
int64_t datasize = 0;
int64_t cachesize = 0;
int64_t asecsize = 0;
int res = 0;
/* pkgdir, userid, apkpath */
res = get_size(arg[0], atoi(arg[1]), arg[2], arg[3], arg[4], arg[5],
&codesize, &datasize, &cachesize, &asecsize);
/*
* Each int64_t can take up 22 characters printed out. Make sure it
* doesn't go over REPLY_MAX in the future.
*/
snprintf(reply, REPLY_MAX, "%" PRId64 " %" PRId64 " %" PRId64 " %" PRId64,
codesize, datasize, cachesize, asecsize);
return res;
}
static int do_rm_user_data(char **arg, char reply[REPLY_MAX])
{
return delete_user_data(arg[0], atoi(arg[1])); /* pkgname, userid */
}
static int do_mk_user_data(char **arg, char reply[REPLY_MAX])
{
return make_user_data(arg[0], atoi(arg[1]), atoi(arg[2]), arg[3]);
/* pkgname, uid, userid, seinfo */
}
static int do_rm_user(char **arg, char reply[REPLY_MAX])
{
return delete_user(atoi(arg[0])); /* userid */
}
static int do_movefiles(char **arg, char reply[REPLY_MAX])
{
return movefiles();
}
static int do_linklib(char **arg, char reply[REPLY_MAX])
{
return linklib(arg[0], arg[1], atoi(arg[2]));
}
struct cmdinfo {
const char *name;
unsigned numargs;
int (*func)(char **arg, char reply[REPLY_MAX]);
};
struct cmdinfo cmds[] = {
{ "ping", 0, do_ping },
{ "install", 4, do_install },
{ "dexopt", 3, do_dexopt },
{ "movedex", 2, do_move_dex },
{ "rmdex", 1, do_rm_dex },
{ "remove", 2, do_remove },
{ "rename", 2, do_rename },
{ "fixuid", 3, do_fixuid },
{ "freecache", 1, do_free_cache },
{ "rmcache", 2, do_rm_cache },
{ "getsize", 6, do_get_size },
{ "rmuserdata", 2, do_rm_user_data },
{ "movefiles", 0, do_movefiles },
{ "linklib", 3, do_linklib },
{ "mkuserdata", 4, do_mk_user_data },
{ "rmuser", 1, do_rm_user },
};
static int readx(int s, void *_buf, int count)
{
char *buf = _buf;
int n = 0, r;
if (count < 0) return -1;
while (n < count) {
r = read(s, buf + n, count - n);
if (r < 0) {
if (errno == EINTR) continue;
ALOGE("read error: %s\n", strerror(errno));
return -1;
}
if (r == 0) {
ALOGE("eof\n");
return -1; /* EOF */
}
n += r;
}
return 0;
}
static int writex(int s, const void *_buf, int count)
{
const char *buf = _buf;
int n = 0, r;
if (count < 0) return -1;
while (n < count) {
r = write(s, buf + n, count - n);
if (r < 0) {
if (errno == EINTR) continue;
ALOGE("write error: %s\n", strerror(errno));
return -1;
}
n += r;
}
return 0;
}
/* Tokenize the command buffer, locate a matching command,
* ensure that the required number of arguments are provided,
* call the function(), return the result.
*/
static int execute(int s, char cmd[BUFFER_MAX])
{
char reply[REPLY_MAX];
char *arg[TOKEN_MAX+1];
unsigned i;
unsigned n = 0;
unsigned short count;
int ret = -1;
// ALOGI("execute('%s')\n", cmd);
/* default reply is "" */
reply[0] = 0;
/* n is number of args (not counting arg[0]) */
arg[0] = cmd;
while (*cmd) {
if (isspace(*cmd)) {
*cmd++ = 0;
n++;
arg[n] = cmd;
if (n == TOKEN_MAX) {
ALOGE("too many arguments\n");
goto done;
}
}
cmd++;
}
for (i = 0; i < sizeof(cmds) / sizeof(cmds[0]); i++) {
if (!strcmp(cmds[i].name,arg[0])) {
if (n != cmds[i].numargs) {
ALOGE("%s requires %d arguments (%d given)\n",
cmds[i].name, cmds[i].numargs, n);
} else {
ret = cmds[i].func(arg + 1, reply);
}
goto done;
}
}
ALOGE("unsupported command '%s'\n", arg[0]);
done:
if (reply[0]) {
n = snprintf(cmd, BUFFER_MAX, "%d %s", ret, reply);
} else {
n = snprintf(cmd, BUFFER_MAX, "%d", ret);
}
if (n > BUFFER_MAX) n = BUFFER_MAX;
count = n;
// ALOGI("reply: '%s'\n", cmd);
if (writex(s, &count, sizeof(count))) return -1;
if (writex(s, cmd, count)) return -1;
return 0;
}
/**
* Initialize all the global variables that are used elsewhere. Returns 0 upon
* success and -1 on error.
*/
void free_globals() {
size_t i;
for (i = 0; i < android_system_dirs.count; i++) {
if (android_system_dirs.dirs[i].path != NULL) {
free(android_system_dirs.dirs[i].path);
}
}
free(android_system_dirs.dirs);
}
int initialize_globals() {
// Get the android data directory.
if (get_path_from_env(&android_data_dir, "ANDROID_DATA") < 0) {
return -1;
}
// Get the android app directory.
if (copy_and_append(&android_app_dir, &android_data_dir, APP_SUBDIR) < 0) {
return -1;
}
// Get the android protected app directory.
if (copy_and_append(&android_app_private_dir, &android_data_dir, PRIVATE_APP_SUBDIR) < 0) {
return -1;
}
// Get the android app native library directory.
if (copy_and_append(&android_app_lib_dir, &android_data_dir, APP_LIB_SUBDIR) < 0) {
return -1;
}
// Get the sd-card ASEC mount point.
if (get_path_from_env(&android_asec_dir, "ASEC_MOUNTPOINT") < 0) {
return -1;
}
// Get the android media directory.
if (copy_and_append(&android_media_dir, &android_data_dir, MEDIA_SUBDIR) < 0) {
return -1;
}
// Take note of the system and vendor directories.
android_system_dirs.count = 2;
android_system_dirs.dirs = calloc(android_system_dirs.count, sizeof(dir_rec_t));
if (android_system_dirs.dirs == NULL) {
ALOGE("Couldn't allocate array for dirs; aborting\n");
return -1;
}
// system
if (get_path_from_env(&android_system_dirs.dirs[0], "ANDROID_ROOT") < 0) {
free_globals();
return -1;
}
// append "app/" to dirs[0]
char *system_app_path = build_string2(android_system_dirs.dirs[0].path, APP_SUBDIR);
android_system_dirs.dirs[0].path = system_app_path;
android_system_dirs.dirs[0].len = strlen(system_app_path);
// vendor
// TODO replace this with an environment variable (doesn't exist yet)
android_system_dirs.dirs[1].path = "/vendor/app/";
android_system_dirs.dirs[1].len = strlen(android_system_dirs.dirs[1].path);
return 0;
}
int initialize_directories() {
int res = -1;
// Read current filesystem layout version to handle upgrade paths
char version_path[PATH_MAX];
snprintf(version_path, PATH_MAX, "%s.layout_version", android_data_dir.path);
int oldVersion;
if (fs_read_atomic_int(version_path, &oldVersion) == -1) {
oldVersion = 0;
}
int version = oldVersion;
// /data/user
char *user_data_dir = build_string2(android_data_dir.path, SECONDARY_USER_PREFIX);
// /data/data
char *legacy_data_dir = build_string2(android_data_dir.path, PRIMARY_USER_PREFIX);
// /data/user/0
char *primary_data_dir = build_string3(android_data_dir.path, SECONDARY_USER_PREFIX, "0");
if (!user_data_dir || !legacy_data_dir || !primary_data_dir) {
goto fail;
}
// Make the /data/user directory if necessary
if (access(user_data_dir, R_OK) < 0) {
if (mkdir(user_data_dir, 0711) < 0) {
goto fail;
}
if (chown(user_data_dir, AID_SYSTEM, AID_SYSTEM) < 0) {
goto fail;
}
if (chmod(user_data_dir, 0711) < 0) {
goto fail;
}
}
// Make the /data/user/0 symlink to /data/data if necessary
if (access(primary_data_dir, R_OK) < 0) {
if (symlink(legacy_data_dir, primary_data_dir)) {
goto fail;
}
}
if (version == 0) {
// Introducing multi-user, so migrate /data/media contents into /data/media/0
ALOGD("Upgrading /data/media for multi-user");
// Ensure /data/media
if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
goto fail;
}
// /data/media.tmp
char media_tmp_dir[PATH_MAX];
snprintf(media_tmp_dir, PATH_MAX, "%smedia.tmp", android_data_dir.path);
// Only copy when upgrade not already in progress
if (access(media_tmp_dir, F_OK) == -1) {
if (rename(android_media_dir.path, media_tmp_dir) == -1) {
ALOGE("Failed to move legacy media path: %s", strerror(errno));
goto fail;
}
}
// Create /data/media again
if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
goto fail;
}
if (selinux_android_restorecon(android_media_dir.path)) {
goto fail;
}
// /data/media/0
char owner_media_dir[PATH_MAX];
snprintf(owner_media_dir, PATH_MAX, "%s0", android_media_dir.path);
// Move any owner data into place
if (access(media_tmp_dir, F_OK) == 0) {
if (rename(media_tmp_dir, owner_media_dir) == -1) {
ALOGE("Failed to move owner media path: %s", strerror(errno));
goto fail;
}
}
// Ensure media directories for any existing users
DIR *dir;
struct dirent *dirent;
char user_media_dir[PATH_MAX];
dir = opendir(user_data_dir);
if (dir != NULL) {
while ((dirent = readdir(dir))) {
if (dirent->d_type == DT_DIR) {
const char *name = dirent->d_name;
// skip "." and ".."
if (name[0] == '.') {
if (name[1] == 0) continue;
if ((name[1] == '.') && (name[2] == 0)) continue;
}
// /data/media/<user_id>
snprintf(user_media_dir, PATH_MAX, "%s%s", android_media_dir.path, name);
if (fs_prepare_dir(user_media_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
goto fail;
}
}
}
closedir(dir);
}
version = 1;
}
// /data/media/obb
char media_obb_dir[PATH_MAX];
snprintf(media_obb_dir, PATH_MAX, "%sobb", android_media_dir.path);
if (version == 1) {
// Introducing /data/media/obb for sharing OBB across users; migrate
// any existing OBB files from owner.
ALOGD("Upgrading to shared /data/media/obb");
// /data/media/0/Android/obb
char owner_obb_path[PATH_MAX];
snprintf(owner_obb_path, PATH_MAX, "%s0/Android/obb", android_media_dir.path);
// Only move if target doesn't already exist
if (access(media_obb_dir, F_OK) != 0 && access(owner_obb_path, F_OK) == 0) {
if (rename(owner_obb_path, media_obb_dir) == -1) {
ALOGE("Failed to move OBB from owner: %s", strerror(errno));
goto fail;
}
}
version = 2;
}
if (ensure_media_user_dirs(0) == -1) {
ALOGE("Failed to setup media for user 0");
goto fail;
}
if (fs_prepare_dir(media_obb_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
goto fail;
}
// Persist layout version if changed
if (version != oldVersion) {
if (fs_write_atomic_int(version_path, version) == -1) {
ALOGE("Failed to save version to %s: %s", version_path, strerror(errno));
goto fail;
}
}
// Success!
res = 0;
fail:
free(user_data_dir);
free(legacy_data_dir);
free(primary_data_dir);
return res;
}
static void drop_privileges() {
if (prctl(PR_SET_KEEPCAPS, 1) < 0) {
ALOGE("prctl(PR_SET_KEEPCAPS) failed: %s\n", strerror(errno));
exit(1);
}
if (setgid(AID_INSTALL) < 0) {
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[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;
}
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