1108 lines
35 KiB
C++
1108 lines
35 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 "utils.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <fts.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/xattr.h>
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#include <sys/statvfs.h>
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#include <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include <cutils/fs.h>
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#include <cutils/properties.h>
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#include <log/log.h>
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#include <private/android_filesystem_config.h>
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#include "globals.h" // extern variables.
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#ifndef LOG_TAG
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#define LOG_TAG "installd"
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#endif
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#define DEBUG_XATTRS 0
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using android::base::StringPrintf;
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namespace android {
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namespace installd {
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/**
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* Check that given string is valid filename, and that it attempts no
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* parent or child directory traversal.
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*/
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bool is_valid_filename(const std::string& name) {
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if (name.empty() || (name == ".") || (name == "..")
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|| (name.find('/') != std::string::npos)) {
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return false;
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} else {
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return true;
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}
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}
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static void check_package_name(const char* package_name) {
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CHECK(is_valid_filename(package_name));
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CHECK(is_valid_package_name(package_name));
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}
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/**
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* Create the path name where package app contents should be stored for
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* the given volume UUID and package name. An empty UUID is assumed to
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* be internal storage.
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*/
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std::string create_data_app_package_path(const char* volume_uuid,
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const char* package_name) {
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check_package_name(package_name);
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return StringPrintf("%s/%s",
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create_data_app_path(volume_uuid).c_str(), package_name);
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}
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/**
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* Create the path name where package data should be stored for the given
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* volume UUID, package name, and user ID. An empty UUID is assumed to be
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* internal storage.
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*/
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std::string create_data_user_ce_package_path(const char* volume_uuid,
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userid_t user, const char* package_name) {
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check_package_name(package_name);
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return StringPrintf("%s/%s",
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create_data_user_ce_path(volume_uuid, user).c_str(), package_name);
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}
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std::string create_data_user_ce_package_path(const char* volume_uuid, userid_t user,
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const char* package_name, ino_t ce_data_inode) {
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// For testing purposes, rely on the inode when defined; this could be
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// optimized to use access() in the future.
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auto fallback = create_data_user_ce_package_path(volume_uuid, user, package_name);
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if (ce_data_inode != 0) {
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auto user_path = create_data_user_ce_path(volume_uuid, user);
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DIR* dir = opendir(user_path.c_str());
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if (dir == nullptr) {
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PLOG(ERROR) << "Failed to opendir " << user_path;
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return fallback;
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}
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struct dirent* ent;
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while ((ent = readdir(dir))) {
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if (ent->d_ino == ce_data_inode) {
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auto resolved = StringPrintf("%s/%s", user_path.c_str(), ent->d_name);
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#if DEBUG_XATTRS
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if (resolved != fallback) {
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LOG(DEBUG) << "Resolved path " << resolved << " for inode " << ce_data_inode
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<< " instead of " << fallback;
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}
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#endif
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closedir(dir);
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return resolved;
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}
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}
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LOG(WARNING) << "Failed to resolve inode " << ce_data_inode << "; using " << fallback;
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closedir(dir);
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return fallback;
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} else {
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return fallback;
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}
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}
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std::string create_data_user_de_package_path(const char* volume_uuid,
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userid_t user, const char* package_name) {
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check_package_name(package_name);
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return StringPrintf("%s/%s",
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create_data_user_de_path(volume_uuid, user).c_str(), package_name);
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}
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int create_pkg_path(char path[PKG_PATH_MAX], const char *pkgname,
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const char *postfix, userid_t userid) {
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if (!is_valid_package_name(pkgname)) {
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path[0] = '\0';
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return -1;
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}
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std::string _tmp(create_data_user_ce_package_path(nullptr, userid, pkgname) + postfix);
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const char* tmp = _tmp.c_str();
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if (strlen(tmp) >= PKG_PATH_MAX) {
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path[0] = '\0';
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return -1;
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} else {
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strcpy(path, tmp);
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return 0;
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}
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}
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std::string create_data_path(const char* volume_uuid) {
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if (volume_uuid == nullptr) {
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return "/data";
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} else if (!strcmp(volume_uuid, "TEST")) {
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CHECK(property_get_bool("ro.debuggable", false));
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return "/data/local/tmp";
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} else {
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CHECK(is_valid_filename(volume_uuid));
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return StringPrintf("/mnt/expand/%s", volume_uuid);
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}
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}
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/**
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* Create the path name for app data.
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*/
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std::string create_data_app_path(const char* volume_uuid) {
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return StringPrintf("%s/app", create_data_path(volume_uuid).c_str());
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}
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/**
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* Create the path name for user data for a certain userid.
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* Keep same implementation as vold to minimize path walking overhead
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*/
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std::string create_data_user_ce_path(const char* volume_uuid, userid_t userid) {
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std::string data(create_data_path(volume_uuid));
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if (volume_uuid == nullptr && userid == 0) {
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std::string legacy = StringPrintf("%s/data", data.c_str());
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struct stat sb;
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if (lstat(legacy.c_str(), &sb) == 0 && S_ISDIR(sb.st_mode)) {
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/* /data/data is dir, return /data/data for legacy system */
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return legacy;
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}
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}
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return StringPrintf("%s/user/%u", data.c_str(), userid);
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}
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/**
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* Create the path name for device encrypted user data for a certain userid.
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*/
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std::string create_data_user_de_path(const char* volume_uuid, userid_t userid) {
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std::string data(create_data_path(volume_uuid));
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return StringPrintf("%s/user_de/%u", data.c_str(), userid);
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}
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/**
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* Create the path name for media for a certain userid.
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*/
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std::string create_data_media_path(const char* volume_uuid, userid_t userid) {
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return StringPrintf("%s/media/%u", create_data_path(volume_uuid).c_str(), userid);
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}
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std::string create_data_media_obb_path(const char* volume_uuid, const char* package_name) {
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return StringPrintf("%s/media/obb/%s", create_data_path(volume_uuid).c_str(), package_name);
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}
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std::string create_data_media_package_path(const char* volume_uuid, userid_t userid,
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const char* data_type, const char* package_name) {
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return StringPrintf("%s/Android/%s/%s", create_data_media_path(volume_uuid, userid).c_str(),
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data_type, package_name);
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}
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std::string create_data_misc_legacy_path(userid_t userid) {
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return StringPrintf("%s/misc/user/%u", create_data_path(nullptr).c_str(), userid);
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}
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std::string create_primary_cur_profile_dir_path(userid_t userid) {
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return StringPrintf("%s/cur/%u", android_profiles_dir.path, userid);
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}
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std::string create_primary_current_profile_package_dir_path(userid_t user,
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const std::string& package_name) {
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check_package_name(package_name.c_str());
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return StringPrintf("%s/%s",
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create_primary_cur_profile_dir_path(user).c_str(), package_name.c_str());
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}
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std::string create_primary_ref_profile_dir_path() {
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return StringPrintf("%s/ref", android_profiles_dir.path);
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}
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std::string create_primary_reference_profile_package_dir_path(const std::string& package_name) {
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check_package_name(package_name.c_str());
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return StringPrintf("%s/ref/%s", android_profiles_dir.path, package_name.c_str());
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}
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std::string create_data_dalvik_cache_path() {
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return "/data/dalvik-cache";
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}
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// Keep profile paths in sync with ActivityThread and LoadedApk.
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const std::string PROFILE_EXT = ".prof";
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const std::string CURRENT_PROFILE_EXT = ".cur";
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const std::string PRIMARY_PROFILE_NAME = "primary" + PROFILE_EXT;
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// Gets the parent directory and the file name for the given secondary dex path.
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// Returns true on success, false on failure (if the dex_path does not have the expected
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// structure).
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static bool get_secondary_dex_location(const std::string& dex_path,
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std::string* out_dir_name, std::string* out_file_name) {
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size_t dirIndex = dex_path.rfind('/');
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if (dirIndex == std::string::npos) {
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return false;
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}
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if (dirIndex == dex_path.size() - 1) {
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return false;
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}
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*out_dir_name = dex_path.substr(0, dirIndex);
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*out_file_name = dex_path.substr(dirIndex + 1);
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return true;
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}
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std::string create_current_profile_path(userid_t user, const std::string& location,
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bool is_secondary_dex) {
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if (is_secondary_dex) {
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// Secondary dex current profiles are stored next to the dex files under the oat folder.
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std::string dex_dir;
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std::string dex_name;
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CHECK(get_secondary_dex_location(location, &dex_dir, &dex_name))
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<< "Unexpected dir structure for secondary dex " << location;
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return StringPrintf("%s/oat/%s%s%s",
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dex_dir.c_str(), dex_name.c_str(), CURRENT_PROFILE_EXT.c_str(),
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PROFILE_EXT.c_str());
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} else {
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// Profiles for primary apks are under /data/misc/profiles/cur.
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std::string profile_dir = create_primary_current_profile_package_dir_path(user, location);
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return StringPrintf("%s/%s", profile_dir.c_str(), PRIMARY_PROFILE_NAME.c_str());
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}
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}
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std::string create_reference_profile_path(const std::string& location, bool is_secondary_dex) {
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if (is_secondary_dex) {
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// Secondary dex reference profiles are stored next to the dex files under the oat folder.
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std::string dex_dir;
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std::string dex_name;
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CHECK(get_secondary_dex_location(location, &dex_dir, &dex_name))
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<< "Unexpected dir structure for secondary dex " << location;
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return StringPrintf("%s/oat/%s%s",
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dex_dir.c_str(), dex_name.c_str(), PROFILE_EXT.c_str());
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} else {
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// Reference profiles for primary apks are stored in /data/misc/profile/ref.
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std::string profile_dir = create_primary_reference_profile_package_dir_path(location);
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return StringPrintf("%s/%s", profile_dir.c_str(), PRIMARY_PROFILE_NAME.c_str());
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}
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}
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std::vector<userid_t> get_known_users(const char* volume_uuid) {
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std::vector<userid_t> users;
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// We always have an owner
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users.push_back(0);
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std::string path(create_data_path(volume_uuid) + "/" + SECONDARY_USER_PREFIX);
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DIR* dir = opendir(path.c_str());
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if (dir == NULL) {
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// Unable to discover other users, but at least return owner
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PLOG(ERROR) << "Failed to opendir " << path;
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return users;
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}
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struct dirent* ent;
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while ((ent = readdir(dir))) {
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if (ent->d_type != DT_DIR) {
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continue;
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}
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char* end;
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userid_t user = strtol(ent->d_name, &end, 10);
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if (*end == '\0' && user != 0) {
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LOG(DEBUG) << "Found valid user " << user;
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users.push_back(user);
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}
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}
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closedir(dir);
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return users;
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}
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int calculate_tree_size(const std::string& path, int64_t* size,
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int32_t include_gid, int32_t exclude_gid, bool exclude_apps) {
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FTS *fts;
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FTSENT *p;
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int64_t matchedSize = 0;
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char *argv[] = { (char*) path.c_str(), nullptr };
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if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, NULL))) {
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if (errno != ENOENT) {
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PLOG(ERROR) << "Failed to fts_open " << path;
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}
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return -1;
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}
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while ((p = fts_read(fts)) != NULL) {
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switch (p->fts_info) {
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case FTS_D:
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case FTS_DEFAULT:
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case FTS_F:
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case FTS_SL:
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case FTS_SLNONE:
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int32_t uid = p->fts_statp->st_uid;
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int32_t gid = p->fts_statp->st_gid;
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int32_t user_uid = multiuser_get_app_id(uid);
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int32_t user_gid = multiuser_get_app_id(gid);
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if (exclude_apps && ((user_uid >= AID_APP_START && user_uid <= AID_APP_END)
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|| (user_gid >= AID_CACHE_GID_START && user_gid <= AID_CACHE_GID_END)
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|| (user_gid >= AID_SHARED_GID_START && user_gid <= AID_SHARED_GID_END))) {
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// Don't traverse inside or measure
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fts_set(fts, p, FTS_SKIP);
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break;
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}
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if (include_gid != -1 && gid != include_gid) {
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break;
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}
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if (exclude_gid != -1 && gid == exclude_gid) {
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break;
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}
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matchedSize += (p->fts_statp->st_blocks * 512);
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break;
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}
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}
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fts_close(fts);
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#if MEASURE_DEBUG
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if ((include_gid == -1) && (exclude_gid == -1)) {
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LOG(DEBUG) << "Measured " << path << " size " << matchedSize;
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} else {
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LOG(DEBUG) << "Measured " << path << " size " << matchedSize << "; include " << include_gid
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<< " exclude " << exclude_gid;
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}
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#endif
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*size += matchedSize;
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return 0;
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}
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int create_move_path(char path[PKG_PATH_MAX],
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const char* pkgname,
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const char* leaf,
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userid_t userid ATTRIBUTE_UNUSED)
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{
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if ((android_data_dir.len + strlen(PRIMARY_USER_PREFIX) + strlen(pkgname) + strlen(leaf) + 1)
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>= PKG_PATH_MAX) {
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return -1;
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}
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sprintf(path, "%s%s%s/%s", android_data_dir.path, PRIMARY_USER_PREFIX, pkgname, leaf);
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return 0;
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}
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/**
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* Checks whether the package name is valid. Returns -1 on error and
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* 0 on success.
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*/
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bool is_valid_package_name(const std::string& packageName) {
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// This logic is borrowed from PackageParser.java
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bool hasSep = false;
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bool front = true;
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auto it = packageName.begin();
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for (; it != packageName.end() && *it != '-'; it++) {
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char c = *it;
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if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
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front = false;
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continue;
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}
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if (!front) {
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if ((c >= '0' && c <= '9') || c == '_') {
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continue;
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}
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}
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if (c == '.') {
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hasSep = true;
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front = true;
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continue;
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}
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LOG(WARNING) << "Bad package character " << c << " in " << packageName;
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return false;
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}
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if (front) {
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LOG(WARNING) << "Missing separator in " << packageName;
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return false;
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}
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for (; it != packageName.end(); it++) {
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char c = *it;
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if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) continue;
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if ((c >= '0' && c <= '9') || c == '_' || c == '-' || c == '=') continue;
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LOG(WARNING) << "Bad suffix character " << c << " in " << packageName;
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return false;
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}
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return true;
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}
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static int _delete_dir_contents(DIR *d,
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int (*exclusion_predicate)(const char *name, const int is_dir))
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{
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int result = 0;
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struct dirent *de;
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int dfd;
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dfd = dirfd(d);
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if (dfd < 0) return -1;
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while ((de = readdir(d))) {
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const char *name = de->d_name;
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/* check using the exclusion predicate, if provided */
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if (exclusion_predicate && exclusion_predicate(name, (de->d_type == DT_DIR))) {
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continue;
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}
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if (de->d_type == DT_DIR) {
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int subfd;
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DIR *subdir;
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/* always 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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subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY | O_NOFOLLOW | O_CLOEXEC);
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if (subfd < 0) {
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ALOGE("Couldn't openat %s: %s\n", name, strerror(errno));
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result = -1;
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continue;
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}
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subdir = fdopendir(subfd);
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if (subdir == NULL) {
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ALOGE("Couldn't fdopendir %s: %s\n", name, strerror(errno));
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close(subfd);
|
|
result = -1;
|
|
continue;
|
|
}
|
|
if (_delete_dir_contents(subdir, exclusion_predicate)) {
|
|
result = -1;
|
|
}
|
|
closedir(subdir);
|
|
if (unlinkat(dfd, name, AT_REMOVEDIR) < 0) {
|
|
ALOGE("Couldn't unlinkat %s: %s\n", name, strerror(errno));
|
|
result = -1;
|
|
}
|
|
} else {
|
|
if (unlinkat(dfd, name, 0) < 0) {
|
|
ALOGE("Couldn't unlinkat %s: %s\n", name, strerror(errno));
|
|
result = -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
int delete_dir_contents(const std::string& pathname, bool ignore_if_missing) {
|
|
return delete_dir_contents(pathname.c_str(), 0, NULL, ignore_if_missing);
|
|
}
|
|
|
|
int delete_dir_contents_and_dir(const std::string& pathname, bool ignore_if_missing) {
|
|
return delete_dir_contents(pathname.c_str(), 1, NULL, ignore_if_missing);
|
|
}
|
|
|
|
int delete_dir_contents(const char *pathname,
|
|
int also_delete_dir,
|
|
int (*exclusion_predicate)(const char*, const int),
|
|
bool ignore_if_missing)
|
|
{
|
|
int res = 0;
|
|
DIR *d;
|
|
|
|
d = opendir(pathname);
|
|
if (d == NULL) {
|
|
if (ignore_if_missing && (errno == ENOENT)) {
|
|
return 0;
|
|
}
|
|
ALOGE("Couldn't opendir %s: %s\n", pathname, strerror(errno));
|
|
return -errno;
|
|
}
|
|
res = _delete_dir_contents(d, exclusion_predicate);
|
|
closedir(d);
|
|
if (also_delete_dir) {
|
|
if (rmdir(pathname)) {
|
|
ALOGE("Couldn't rmdir %s: %s\n", pathname, strerror(errno));
|
|
res = -1;
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
int delete_dir_contents_fd(int dfd, const char *name)
|
|
{
|
|
int fd, res;
|
|
DIR *d;
|
|
|
|
fd = openat(dfd, name, O_RDONLY | O_DIRECTORY | O_NOFOLLOW | O_CLOEXEC);
|
|
if (fd < 0) {
|
|
ALOGE("Couldn't openat %s: %s\n", name, strerror(errno));
|
|
return -1;
|
|
}
|
|
d = fdopendir(fd);
|
|
if (d == NULL) {
|
|
ALOGE("Couldn't fdopendir %s: %s\n", name, strerror(errno));
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
res = _delete_dir_contents(d, 0);
|
|
closedir(d);
|
|
return res;
|
|
}
|
|
|
|
static int _copy_owner_permissions(int srcfd, int dstfd)
|
|
{
|
|
struct stat st;
|
|
if (fstat(srcfd, &st) != 0) {
|
|
return -1;
|
|
}
|
|
if (fchmod(dstfd, st.st_mode) != 0) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int _copy_dir_files(int sdfd, int ddfd, uid_t owner, gid_t group)
|
|
{
|
|
int result = 0;
|
|
if (_copy_owner_permissions(sdfd, ddfd) != 0) {
|
|
ALOGE("_copy_dir_files failed to copy dir permissions\n");
|
|
}
|
|
if (fchown(ddfd, owner, group) != 0) {
|
|
ALOGE("_copy_dir_files failed to change dir owner\n");
|
|
}
|
|
|
|
DIR *ds = fdopendir(sdfd);
|
|
if (ds == NULL) {
|
|
ALOGE("Couldn't fdopendir: %s\n", strerror(errno));
|
|
return -1;
|
|
}
|
|
struct dirent *de;
|
|
while ((de = readdir(ds))) {
|
|
if (de->d_type != DT_REG) {
|
|
continue;
|
|
}
|
|
|
|
const char *name = de->d_name;
|
|
int fsfd = openat(sdfd, name, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
|
|
int fdfd = openat(ddfd, name, O_WRONLY | O_NOFOLLOW | O_CLOEXEC | O_CREAT, 0600);
|
|
if (fsfd == -1 || fdfd == -1) {
|
|
ALOGW("Couldn't copy %s: %s\n", name, strerror(errno));
|
|
} else {
|
|
if (_copy_owner_permissions(fsfd, fdfd) != 0) {
|
|
ALOGE("Failed to change file permissions\n");
|
|
}
|
|
if (fchown(fdfd, owner, group) != 0) {
|
|
ALOGE("Failed to change file owner\n");
|
|
}
|
|
|
|
char buf[8192];
|
|
ssize_t size;
|
|
while ((size = read(fsfd, buf, sizeof(buf))) > 0) {
|
|
write(fdfd, buf, size);
|
|
}
|
|
if (size < 0) {
|
|
ALOGW("Couldn't copy %s: %s\n", name, strerror(errno));
|
|
result = -1;
|
|
}
|
|
}
|
|
close(fdfd);
|
|
close(fsfd);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
int copy_dir_files(const char *srcname,
|
|
const char *dstname,
|
|
uid_t owner,
|
|
uid_t group)
|
|
{
|
|
int res = 0;
|
|
DIR *ds = NULL;
|
|
DIR *dd = NULL;
|
|
|
|
ds = opendir(srcname);
|
|
if (ds == NULL) {
|
|
ALOGE("Couldn't opendir %s: %s\n", srcname, strerror(errno));
|
|
return -errno;
|
|
}
|
|
|
|
mkdir(dstname, 0600);
|
|
dd = opendir(dstname);
|
|
if (dd == NULL) {
|
|
ALOGE("Couldn't opendir %s: %s\n", dstname, strerror(errno));
|
|
closedir(ds);
|
|
return -errno;
|
|
}
|
|
|
|
int sdfd = dirfd(ds);
|
|
int ddfd = dirfd(dd);
|
|
if (sdfd != -1 && ddfd != -1) {
|
|
res = _copy_dir_files(sdfd, ddfd, owner, group);
|
|
} else {
|
|
res = -errno;
|
|
}
|
|
closedir(dd);
|
|
closedir(ds);
|
|
return res;
|
|
}
|
|
|
|
int64_t data_disk_free(const std::string& data_path) {
|
|
struct statvfs sfs;
|
|
if (statvfs(data_path.c_str(), &sfs) == 0) {
|
|
return static_cast<int64_t>(sfs.f_bavail) * sfs.f_frsize;
|
|
} else {
|
|
PLOG(ERROR) << "Couldn't statvfs " << data_path;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
int get_path_inode(const std::string& path, ino_t *inode) {
|
|
struct stat buf;
|
|
memset(&buf, 0, sizeof(buf));
|
|
if (stat(path.c_str(), &buf) != 0) {
|
|
PLOG(WARNING) << "Failed to stat " << path;
|
|
return -1;
|
|
} else {
|
|
*inode = buf.st_ino;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Write the inode of a specific child file into the given xattr on the
|
|
* parent directory. This allows you to find the child later, even if its
|
|
* name is encrypted.
|
|
*/
|
|
int write_path_inode(const std::string& parent, const char* name, const char* inode_xattr) {
|
|
ino_t inode = 0;
|
|
uint64_t inode_raw = 0;
|
|
auto path = StringPrintf("%s/%s", parent.c_str(), name);
|
|
|
|
if (get_path_inode(path, &inode) != 0) {
|
|
// Path probably doesn't exist yet; ignore
|
|
return 0;
|
|
}
|
|
|
|
// Check to see if already set correctly
|
|
if (getxattr(parent.c_str(), inode_xattr, &inode_raw, sizeof(inode_raw)) == sizeof(inode_raw)) {
|
|
if (inode_raw == inode) {
|
|
// Already set correctly; skip writing
|
|
return 0;
|
|
} else {
|
|
PLOG(WARNING) << "Mismatched inode value; found " << inode
|
|
<< " on disk but marked value was " << inode_raw << "; overwriting";
|
|
}
|
|
}
|
|
|
|
inode_raw = inode;
|
|
if (setxattr(parent.c_str(), inode_xattr, &inode_raw, sizeof(inode_raw), 0) != 0 && errno != EOPNOTSUPP) {
|
|
PLOG(ERROR) << "Failed to write xattr " << inode_xattr << " at " << parent;
|
|
return -1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Read the inode of a specific child file from the given xattr on the
|
|
* parent directory. Returns a currently valid path for that child, which
|
|
* might have an encrypted name.
|
|
*/
|
|
std::string read_path_inode(const std::string& parent, const char* name, const char* inode_xattr) {
|
|
ino_t inode = 0;
|
|
uint64_t inode_raw = 0;
|
|
auto fallback = StringPrintf("%s/%s", parent.c_str(), name);
|
|
|
|
// Lookup the inode value written earlier
|
|
if (getxattr(parent.c_str(), inode_xattr, &inode_raw, sizeof(inode_raw)) == sizeof(inode_raw)) {
|
|
inode = inode_raw;
|
|
}
|
|
|
|
// For testing purposes, rely on the inode when defined; this could be
|
|
// optimized to use access() in the future.
|
|
if (inode != 0) {
|
|
DIR* dir = opendir(parent.c_str());
|
|
if (dir == nullptr) {
|
|
PLOG(ERROR) << "Failed to opendir " << parent;
|
|
return fallback;
|
|
}
|
|
|
|
struct dirent* ent;
|
|
while ((ent = readdir(dir))) {
|
|
if (ent->d_ino == inode) {
|
|
auto resolved = StringPrintf("%s/%s", parent.c_str(), ent->d_name);
|
|
#if DEBUG_XATTRS
|
|
if (resolved != fallback) {
|
|
LOG(DEBUG) << "Resolved path " << resolved << " for inode " << inode
|
|
<< " instead of " << fallback;
|
|
}
|
|
#endif
|
|
closedir(dir);
|
|
return resolved;
|
|
}
|
|
}
|
|
LOG(WARNING) << "Failed to resolve inode " << inode << "; using " << fallback;
|
|
closedir(dir);
|
|
return fallback;
|
|
} else {
|
|
return fallback;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Validate that the path is valid in the context of the provided directory.
|
|
* The path is allowed to have at most one subdirectory and no indirections
|
|
* to top level directories (i.e. have "..").
|
|
*/
|
|
static int validate_path(const dir_rec_t* dir, const char* path, int maxSubdirs) {
|
|
size_t dir_len = dir->len;
|
|
const char* subdir = strchr(path + dir_len, '/');
|
|
|
|
// Only allow the path to have at most one subdirectory.
|
|
if (subdir != NULL) {
|
|
++subdir;
|
|
if ((--maxSubdirs == 0) && strchr(subdir, '/') != NULL) {
|
|
ALOGE("invalid apk path '%s' (subdir?)\n", path);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
// Directories can't have a period directly after the directory markers to prevent "..".
|
|
if ((path[dir_len] == '.') || ((subdir != NULL) && (*subdir == '.'))) {
|
|
ALOGE("invalid apk path '%s' (trickery)\n", path);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Checks whether a path points to a system app (.apk file). Returns 0
|
|
* if it is a system app or -1 if it is not.
|
|
*/
|
|
int validate_system_app_path(const char* path) {
|
|
size_t i;
|
|
|
|
for (i = 0; i < android_system_dirs.count; i++) {
|
|
const size_t dir_len = android_system_dirs.dirs[i].len;
|
|
if (!strncmp(path, android_system_dirs.dirs[i].path, dir_len)) {
|
|
return validate_path(android_system_dirs.dirs + i, path, 1);
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
bool validate_secondary_dex_path(const std::string& pkgname, const std::string& dex_path,
|
|
const char* volume_uuid, int uid, int storage_flag, bool validate_package_path) {
|
|
CHECK(storage_flag == FLAG_STORAGE_CE || storage_flag == FLAG_STORAGE_DE);
|
|
|
|
// Empty paths are not allowed.
|
|
if (dex_path.empty()) { return false; }
|
|
// First character should always be '/'. No relative paths.
|
|
if (dex_path[0] != '/') { return false; }
|
|
// The last character should not be '/'.
|
|
if (dex_path[dex_path.size() - 1] == '/') { return false; }
|
|
// There should be no '.' after the directory marker.
|
|
if (dex_path.find("/.") != std::string::npos) { return false; }
|
|
// The path should be at most PKG_PATH_MAX long.
|
|
if (dex_path.size() > PKG_PATH_MAX) { return false; }
|
|
|
|
if (validate_package_path) {
|
|
// If we are asked to validate the package path check that
|
|
// the dex_path is under the app data directory.
|
|
std::string app_private_dir = storage_flag == FLAG_STORAGE_CE
|
|
? create_data_user_ce_package_path(
|
|
volume_uuid, multiuser_get_user_id(uid), pkgname.c_str())
|
|
: create_data_user_de_package_path(
|
|
volume_uuid, multiuser_get_user_id(uid), pkgname.c_str());
|
|
|
|
if (strncmp(dex_path.c_str(), app_private_dir.c_str(), app_private_dir.size()) != 0) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// If we got here we have a valid path.
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Get the contents of a environment variable that contains a path. Caller
|
|
* owns the string that is inserted into the directory record. Returns
|
|
* 0 on success and -1 on error.
|
|
*/
|
|
int get_path_from_env(dir_rec_t* rec, const char* var) {
|
|
const char* path = getenv(var);
|
|
int ret = get_path_from_string(rec, path);
|
|
if (ret < 0) {
|
|
ALOGW("Problem finding value for environment variable %s\n", var);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Puts the string into the record as a directory. Appends '/' to the end
|
|
* of all paths. Caller owns the string that is inserted into the directory
|
|
* record. A null value will result in an error.
|
|
*
|
|
* Returns 0 on success and -1 on error.
|
|
*/
|
|
int get_path_from_string(dir_rec_t* rec, const char* path) {
|
|
if (path == NULL) {
|
|
return -1;
|
|
} else {
|
|
const size_t path_len = strlen(path);
|
|
if (path_len <= 0) {
|
|
return -1;
|
|
}
|
|
|
|
// Make sure path is absolute.
|
|
if (path[0] != '/') {
|
|
return -1;
|
|
}
|
|
|
|
if (path[path_len - 1] == '/') {
|
|
// Path ends with a forward slash. Make our own copy.
|
|
|
|
rec->path = strdup(path);
|
|
if (rec->path == NULL) {
|
|
return -1;
|
|
}
|
|
|
|
rec->len = path_len;
|
|
} else {
|
|
// Path does not end with a slash. Generate a new string.
|
|
char *dst;
|
|
|
|
// Add space for slash and terminating null.
|
|
size_t dst_size = path_len + 2;
|
|
|
|
rec->path = (char*) malloc(dst_size);
|
|
if (rec->path == NULL) {
|
|
return -1;
|
|
}
|
|
|
|
dst = rec->path;
|
|
|
|
if (append_and_increment(&dst, path, &dst_size) < 0
|
|
|| append_and_increment(&dst, "/", &dst_size)) {
|
|
ALOGE("Error canonicalizing path");
|
|
return -1;
|
|
}
|
|
|
|
rec->len = dst - rec->path;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int copy_and_append(dir_rec_t* dst, const dir_rec_t* src, const char* suffix) {
|
|
dst->len = src->len + strlen(suffix);
|
|
const size_t dstSize = dst->len + 1;
|
|
dst->path = (char*) malloc(dstSize);
|
|
|
|
if (dst->path == NULL
|
|
|| snprintf(dst->path, dstSize, "%s%s", src->path, suffix)
|
|
!= (ssize_t) dst->len) {
|
|
ALOGE("Could not allocate memory to hold appended path; aborting\n");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Check whether path points to a valid path for an APK file. The path must
|
|
* begin with a whitelisted prefix path and must be no deeper than |maxSubdirs| within
|
|
* that path. Returns -1 when an invalid path is encountered and 0 when a valid path
|
|
* is encountered.
|
|
*/
|
|
static int validate_apk_path_internal(const char *path, int maxSubdirs) {
|
|
const dir_rec_t* dir = NULL;
|
|
if (!strncmp(path, android_app_dir.path, android_app_dir.len)) {
|
|
dir = &android_app_dir;
|
|
} else if (!strncmp(path, android_app_private_dir.path, android_app_private_dir.len)) {
|
|
dir = &android_app_private_dir;
|
|
} else if (!strncmp(path, android_app_ephemeral_dir.path, android_app_ephemeral_dir.len)) {
|
|
dir = &android_app_ephemeral_dir;
|
|
} else if (!strncmp(path, android_asec_dir.path, android_asec_dir.len)) {
|
|
dir = &android_asec_dir;
|
|
} else if (!strncmp(path, android_mnt_expand_dir.path, android_mnt_expand_dir.len)) {
|
|
dir = &android_mnt_expand_dir;
|
|
if (maxSubdirs < 2) {
|
|
maxSubdirs = 2;
|
|
}
|
|
} else {
|
|
return -1;
|
|
}
|
|
|
|
return validate_path(dir, path, maxSubdirs);
|
|
}
|
|
|
|
int validate_apk_path(const char* path) {
|
|
return validate_apk_path_internal(path, 1 /* maxSubdirs */);
|
|
}
|
|
|
|
int validate_apk_path_subdirs(const char* path) {
|
|
return validate_apk_path_internal(path, 3 /* maxSubdirs */);
|
|
}
|
|
|
|
int append_and_increment(char** dst, const char* src, size_t* dst_size) {
|
|
ssize_t ret = strlcpy(*dst, src, *dst_size);
|
|
if (ret < 0 || (size_t) ret >= *dst_size) {
|
|
return -1;
|
|
}
|
|
*dst += ret;
|
|
*dst_size -= ret;
|
|
return 0;
|
|
}
|
|
|
|
char *build_string2(const char *s1, const char *s2) {
|
|
if (s1 == NULL || s2 == NULL) return NULL;
|
|
|
|
int len_s1 = strlen(s1);
|
|
int len_s2 = strlen(s2);
|
|
int len = len_s1 + len_s2 + 1;
|
|
char *result = (char *) malloc(len);
|
|
if (result == NULL) return NULL;
|
|
|
|
strcpy(result, s1);
|
|
strcpy(result + len_s1, s2);
|
|
|
|
return result;
|
|
}
|
|
|
|
char *build_string3(const char *s1, const char *s2, const char *s3) {
|
|
if (s1 == NULL || s2 == NULL || s3 == NULL) return NULL;
|
|
|
|
int len_s1 = strlen(s1);
|
|
int len_s2 = strlen(s2);
|
|
int len_s3 = strlen(s3);
|
|
int len = len_s1 + len_s2 + len_s3 + 1;
|
|
char *result = (char *) malloc(len);
|
|
if (result == NULL) return NULL;
|
|
|
|
strcpy(result, s1);
|
|
strcpy(result + len_s1, s2);
|
|
strcpy(result + len_s1 + len_s2, s3);
|
|
|
|
return result;
|
|
}
|
|
|
|
int ensure_config_user_dirs(userid_t userid) {
|
|
// writable by system, readable by any app within the same user
|
|
const int uid = multiuser_get_uid(userid, AID_SYSTEM);
|
|
const int gid = multiuser_get_uid(userid, AID_EVERYBODY);
|
|
|
|
// Ensure /data/misc/user/<userid> exists
|
|
auto path = create_data_misc_legacy_path(userid);
|
|
return fs_prepare_dir(path.c_str(), 0750, uid, gid);
|
|
}
|
|
|
|
int wait_child(pid_t pid)
|
|
{
|
|
int status;
|
|
pid_t got_pid;
|
|
|
|
while (1) {
|
|
got_pid = waitpid(pid, &status, 0);
|
|
if (got_pid == -1 && errno == EINTR) {
|
|
printf("waitpid interrupted, retrying\n");
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
if (got_pid != pid) {
|
|
ALOGW("waitpid failed: wanted %d, got %d: %s\n",
|
|
(int) pid, (int) got_pid, strerror(errno));
|
|
return 1;
|
|
}
|
|
|
|
if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
|
|
return 0;
|
|
} else {
|
|
return status; /* always nonzero */
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Prepare an app cache directory, which offers to fix-up the GID and
|
|
* directory mode flags during a platform upgrade.
|
|
* The app cache directory path will be 'parent'/'name'.
|
|
*/
|
|
int prepare_app_cache_dir(const std::string& parent, const char* name, mode_t target_mode,
|
|
uid_t uid, gid_t gid) {
|
|
auto path = StringPrintf("%s/%s", parent.c_str(), name);
|
|
struct stat st;
|
|
if (stat(path.c_str(), &st) != 0) {
|
|
if (errno == ENOENT) {
|
|
// This is fine, just create it
|
|
if (fs_prepare_dir_strict(path.c_str(), target_mode, uid, gid) != 0) {
|
|
PLOG(ERROR) << "Failed to prepare " << path;
|
|
return -1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
} else {
|
|
PLOG(ERROR) << "Failed to stat " << path;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
mode_t actual_mode = st.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO | S_ISGID);
|
|
if (st.st_uid != uid) {
|
|
// Mismatched UID is real trouble; we can't recover
|
|
LOG(ERROR) << "Mismatched UID at " << path << ": found " << st.st_uid
|
|
<< " but expected " << uid;
|
|
return -1;
|
|
} else if (st.st_gid == gid && actual_mode == target_mode) {
|
|
// Everything looks good!
|
|
return 0;
|
|
} else {
|
|
// Mismatched GID/mode is recoverable; fall through to update
|
|
LOG(DEBUG) << "Mismatched cache GID/mode at " << path << ": found " << st.st_gid
|
|
<< " but expected " << gid;
|
|
}
|
|
|
|
// Directory is owned correctly, but GID or mode mismatch means it's
|
|
// probably a platform upgrade so we need to fix them
|
|
FTS *fts;
|
|
FTSENT *p;
|
|
char *argv[] = { (char*) path.c_str(), nullptr };
|
|
if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, NULL))) {
|
|
PLOG(ERROR) << "Failed to fts_open " << path;
|
|
return -1;
|
|
}
|
|
while ((p = fts_read(fts)) != NULL) {
|
|
switch (p->fts_info) {
|
|
case FTS_DP:
|
|
if (chmod(p->fts_path, target_mode) != 0) {
|
|
PLOG(WARNING) << "Failed to chmod " << p->fts_path;
|
|
}
|
|
// Intentional fall through to also set GID
|
|
case FTS_F:
|
|
if (chown(p->fts_path, -1, gid) != 0) {
|
|
PLOG(WARNING) << "Failed to chown " << p->fts_path;
|
|
}
|
|
break;
|
|
case FTS_SL:
|
|
case FTS_SLNONE:
|
|
if (lchown(p->fts_path, -1, gid) != 0) {
|
|
PLOG(WARNING) << "Failed to chown " << p->fts_path;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
fts_close(fts);
|
|
return 0;
|
|
}
|
|
|
|
} // namespace installd
|
|
} // namespace android
|