/*
* Copyright (C) 2016 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.
*/
#define LOG_TAG "keystore"
#include "keystore.h"
#include <dirent.h>
#include <fcntl.h>
#include <openssl/bio.h>
#include <utils/String16.h>
#include <keystore/IKeystoreService.h>
#include <android/hardware/keymaster/3.0/IKeymasterDevice.h>
#include "keystore_utils.h"
#include "permissions.h"
#include <keystore/keystore_hidl_support.h>
const char* KeyStore::sOldMasterKey = ".masterkey";
const char* KeyStore::sMetaDataFile = ".metadata";
const android::String16 KeyStore::sRSAKeyType("RSA");
using namespace keystore;
KeyStore::KeyStore(Entropy* entropy, const km_device_t& device, const km_device_t& fallback,
bool allowNewFallback)
: mEntropy(entropy), mDevice(device), mFallbackDevice(fallback),
mAllowNewFallback(allowNewFallback) {
memset(&mMetaData, '\0', sizeof(mMetaData));
}
KeyStore::~KeyStore() {
for (android::Vector<grant_t*>::iterator it(mGrants.begin()); it != mGrants.end(); it++) {
delete *it;
}
mGrants.clear();
for (android::Vector<UserState*>::iterator it(mMasterKeys.begin()); it != mMasterKeys.end();
it++) {
delete *it;
}
mMasterKeys.clear();
}
ResponseCode KeyStore::initialize() {
readMetaData();
if (upgradeKeystore()) {
writeMetaData();
}
return ResponseCode::NO_ERROR;
}
ResponseCode KeyStore::initializeUser(const android::String8& pw, uid_t userId) {
UserState* userState = getUserState(userId);
return userState->initialize(pw, mEntropy);
}
ResponseCode KeyStore::copyMasterKey(uid_t srcUser, uid_t dstUser) {
UserState* userState = getUserState(dstUser);
UserState* initState = getUserState(srcUser);
return userState->copyMasterKey(initState);
}
ResponseCode KeyStore::writeMasterKey(const android::String8& pw, uid_t userId) {
UserState* userState = getUserState(userId);
return userState->writeMasterKey(pw, mEntropy);
}
ResponseCode KeyStore::readMasterKey(const android::String8& pw, uid_t userId) {
UserState* userState = getUserState(userId);
return userState->readMasterKey(pw, mEntropy);
}
/* Here is the encoding of keys. This is necessary in order to allow arbitrary
* characters in keys. Characters in [0-~] are not encoded. Others are encoded
* into two bytes. The first byte is one of [+-.] which represents the first
* two bits of the character. The second byte encodes the rest of the bits into
* [0-o]. Therefore in the worst case the length of a key gets doubled. Note
* that Base64 cannot be used here due to the need of prefix match on keys. */
static size_t encode_key_length(const android::String8& keyName) {
const uint8_t* in = reinterpret_cast<const uint8_t*>(keyName.string());
size_t length = keyName.length();
for (int i = length; i > 0; --i, ++in) {
if (*in < '0' || *in > '~') {
++length;
}
}
return length;
}
static int encode_key(char* out, const android::String8& keyName) {
const uint8_t* in = reinterpret_cast<const uint8_t*>(keyName.string());
size_t length = keyName.length();
for (int i = length; i > 0; --i, ++in, ++out) {
if (*in < '0' || *in > '~') {
*out = '+' + (*in >> 6);
*++out = '0' + (*in & 0x3F);
++length;
} else {
*out = *in;
}
}
*out = '\0';
return length;
}
android::String8 KeyStore::getKeyName(const android::String8& keyName, const BlobType type) {
std::vector<char> encoded(encode_key_length(keyName) + 1); // add 1 for null char
encode_key(encoded.data(), keyName);
if (type == TYPE_KEY_CHARACTERISTICS) {
return android::String8::format(".chr_%s", encoded.data());
} else {
return android::String8(encoded.data());
}
}
android::String8 KeyStore::getKeyNameForUid(
const android::String8& keyName, uid_t uid, const BlobType type) {
std::vector<char> encoded(encode_key_length(keyName) + 1); // add 1 for null char
encode_key(encoded.data(), keyName);
if (type == TYPE_KEY_CHARACTERISTICS) {
return android::String8::format(".%u_chr_%s", uid, encoded.data());
} else {
return android::String8::format("%u_%s", uid, encoded.data());
}
}
android::String8 KeyStore::getKeyNameForUidWithDir(
const android::String8& keyName, uid_t uid, const BlobType type) {
std::vector<char> encoded(encode_key_length(keyName) + 1); // add 1 for null char
encode_key(encoded.data(), keyName);
if (type == TYPE_KEY_CHARACTERISTICS) {
return android::String8::format("%s/.%u_chr_%s", getUserStateByUid(uid)->getUserDirName(),
uid, encoded.data());
} else {
return android::String8::format("%s/%u_%s", getUserStateByUid(uid)->getUserDirName(), uid,
encoded.data());
}
}
void KeyStore::resetUser(uid_t userId, bool keepUnenryptedEntries) {
android::String8 prefix("");
android::Vector<android::String16> aliases;
UserState* userState = getUserState(userId);
if (list(prefix, &aliases, userId) != ResponseCode::NO_ERROR) {
return;
}
for (uint32_t i = 0; i < aliases.size(); i++) {
android::String8 filename(aliases[i]);
filename = android::String8::format("%s/%s", userState->getUserDirName(),
getKeyName(filename, TYPE_ANY).string());
bool shouldDelete = true;
if (keepUnenryptedEntries) {
Blob blob;
ResponseCode rc = get(filename, &blob, ::TYPE_ANY, userId);
switch (rc) {
case ResponseCode::SYSTEM_ERROR:
case ResponseCode::VALUE_CORRUPTED:
// If we can't read blobs, delete them.
shouldDelete = true;
break;
case ResponseCode::NO_ERROR:
case ResponseCode::LOCKED:
// Delete encrypted blobs but keep unencrypted blobs and super-encrypted blobs. We
// need to keep super-encrypted blobs so we can report that the user is
// unauthenticated if a caller tries to use them, rather than reporting that they
// don't exist.
shouldDelete = blob.isEncrypted();
break;
default:
ALOGE("Got unexpected return code %d from KeyStore::get()", rc);
// This shouldn't happen. To be on the safe side, delete it.
shouldDelete = true;
break;
}
}
if (shouldDelete) {
del(filename, ::TYPE_ANY, userId);
// del() will fail silently if no cached characteristics are present for this alias.
android::String8 chr_filename(aliases[i]);
chr_filename = android::String8::format("%s/%s", userState->getUserDirName(),
getKeyName(chr_filename,
TYPE_KEY_CHARACTERISTICS).string());
del(chr_filename, ::TYPE_KEY_CHARACTERISTICS, userId);
}
}
if (!userState->deleteMasterKey()) {
ALOGE("Failed to delete user %d's master key", userId);
}
if (!keepUnenryptedEntries) {
if (!userState->reset()) {
ALOGE("Failed to remove user %d's directory", userId);
}
}
}
bool KeyStore::isEmpty(uid_t userId) const {
const UserState* userState = getUserState(userId);
if (userState == NULL) {
return true;
}
DIR* dir = opendir(userState->getUserDirName());
if (!dir) {
return true;
}
bool result = true;
struct dirent* file;
while ((file = readdir(dir)) != NULL) {
// We only care about files.
if (file->d_type != DT_REG) {
continue;
}
// Skip anything that starts with a "."
if (file->d_name[0] == '.') {
continue;
}
result = false;
break;
}
closedir(dir);
return result;
}
void KeyStore::lock(uid_t userId) {
UserState* userState = getUserState(userId);
userState->zeroizeMasterKeysInMemory();
userState->setState(STATE_LOCKED);
}
ResponseCode KeyStore::get(const char* filename, Blob* keyBlob, const BlobType type, uid_t userId) {
UserState* userState = getUserState(userId);
ResponseCode rc =
keyBlob->readBlob(filename, userState->getDecryptionKey(), userState->getState());
if (rc != ResponseCode::NO_ERROR) {
return rc;
}
const uint8_t version = keyBlob->getVersion();
if (version < CURRENT_BLOB_VERSION) {
/* If we upgrade the key, we need to write it to disk again. Then
* it must be read it again since the blob is encrypted each time
* it's written.
*/
if (upgradeBlob(filename, keyBlob, version, type, userId)) {
if ((rc = this->put(filename, keyBlob, userId)) != ResponseCode::NO_ERROR ||
(rc = keyBlob->readBlob(filename, userState->getDecryptionKey(),
userState->getState())) != ResponseCode::NO_ERROR) {
return rc;
}
}
}
/*
* This will upgrade software-backed keys to hardware-backed keys.
*/
if (rc == ResponseCode::NO_ERROR && type == TYPE_KEY_PAIR && keyBlob->isFallback()) {
ResponseCode imported =
importKey(keyBlob->getValue(), keyBlob->getLength(), filename, userId,
keyBlob->isEncrypted() ? KEYSTORE_FLAG_ENCRYPTED : KEYSTORE_FLAG_NONE);
// The HAL allowed the import, reget the key to have the "fresh" version.
if (imported == ResponseCode::NO_ERROR) {
rc = get(filename, keyBlob, TYPE_KEY_PAIR, userId);
}
}
// Keymaster 0.3 keys are valid keymaster 1.0 keys, so silently upgrade.
if (keyBlob->getType() == TYPE_KEY_PAIR) {
keyBlob->setType(TYPE_KEYMASTER_10);
rc = this->put(filename, keyBlob, userId);
}
if (type != TYPE_ANY && keyBlob->getType() != type) {
ALOGW("key found but type doesn't match: %d vs %d", keyBlob->getType(), type);
return ResponseCode::KEY_NOT_FOUND;
}
return rc;
}
ResponseCode KeyStore::put(const char* filename, Blob* keyBlob, uid_t userId) {
UserState* userState = getUserState(userId);
return keyBlob->writeBlob(filename, userState->getEncryptionKey(), userState->getState(),
mEntropy);
}
ResponseCode KeyStore::del(const char* filename, const BlobType type, uid_t userId) {
Blob keyBlob;
ResponseCode rc = get(filename, &keyBlob, type, userId);
if (rc == ResponseCode::VALUE_CORRUPTED) {
// The file is corrupt, the best we can do is rm it.
return (unlink(filename) && errno != ENOENT) ?
ResponseCode::SYSTEM_ERROR : ResponseCode::NO_ERROR;
}
if (rc != ResponseCode::NO_ERROR) {
return rc;
}
auto& dev = getDevice(keyBlob);
if (keyBlob.getType() == ::TYPE_KEY_PAIR || keyBlob.getType() == ::TYPE_KEYMASTER_10) {
auto ret = KS_HANDLE_HIDL_ERROR(dev->deleteKey(blob2hidlVec(keyBlob)));
// A device doesn't have to implement delete_key.
if (ret != ErrorCode::OK && ret != ErrorCode::UNIMPLEMENTED)
return ResponseCode::SYSTEM_ERROR;
}
return (unlink(filename) && errno != ENOENT) ?
ResponseCode::SYSTEM_ERROR : ResponseCode::NO_ERROR;
}
/*
* Converts from the "escaped" format on disk to actual name.
* This will be smaller than the input string.
*
* Characters that should combine with the next at the end will be truncated.
*/
static size_t decode_key_length(const char* in, size_t length) {
size_t outLength = 0;
for (const char* end = in + length; in < end; in++) {
/* This combines with the next character. */
if (*in < '0' || *in > '~') {
continue;
}
outLength++;
}
return outLength;
}
static void decode_key(char* out, const char* in, size_t length) {
for (const char* end = in + length; in < end; in++) {
if (*in < '0' || *in > '~') {
/* Truncate combining characters at the end. */
if (in + 1 >= end) {
break;
}
*out = (*in++ - '+') << 6;
*out++ |= (*in - '0') & 0x3F;
} else {
*out++ = *in;
}
}
*out = '\0';
}
ResponseCode KeyStore::list(const android::String8& prefix,
android::Vector<android::String16>* matches, uid_t userId) {
UserState* userState = getUserState(userId);
size_t n = prefix.length();
DIR* dir = opendir(userState->getUserDirName());
if (!dir) {
ALOGW("can't open directory for user: %s", strerror(errno));
return ResponseCode::SYSTEM_ERROR;
}
struct dirent* file;
while ((file = readdir(dir)) != NULL) {
// We only care about files.
if (file->d_type != DT_REG) {
continue;
}
// Skip anything that starts with a "."
if (file->d_name[0] == '.') {
continue;
}
if (!strncmp(prefix.string(), file->d_name, n)) {
const char* p = &file->d_name[n];
size_t plen = strlen(p);
size_t extra = decode_key_length(p, plen);
char* match = (char*)malloc(extra + 1);
if (match != NULL) {
decode_key(match, p, plen);
matches->push(android::String16(match, extra));
free(match);
} else {
ALOGW("could not allocate match of size %zd", extra);
}
}
}
closedir(dir);
return ResponseCode::NO_ERROR;
}
void KeyStore::addGrant(const char* filename, uid_t granteeUid) {
const grant_t* existing = getGrant(filename, granteeUid);
if (existing == NULL) {
grant_t* grant = new grant_t;
grant->uid = granteeUid;
grant->filename = reinterpret_cast<const uint8_t*>(strdup(filename));
mGrants.add(grant);
}
}
bool KeyStore::removeGrant(const char* filename, uid_t granteeUid) {
for (android::Vector<grant_t*>::iterator it(mGrants.begin()); it != mGrants.end(); it++) {
grant_t* grant = *it;
if (grant->uid == granteeUid &&
!strcmp(reinterpret_cast<const char*>(grant->filename), filename)) {
mGrants.erase(it);
return true;
}
}
return false;
}
ResponseCode KeyStore::importKey(const uint8_t* key, size_t keyLen, const char* filename,
uid_t userId, int32_t flags) {
Unique_PKCS8_PRIV_KEY_INFO pkcs8(d2i_PKCS8_PRIV_KEY_INFO(NULL, &key, keyLen));
if (!pkcs8.get()) {
return ResponseCode::SYSTEM_ERROR;
}
Unique_EVP_PKEY pkey(EVP_PKCS82PKEY(pkcs8.get()));
if (!pkey.get()) {
return ResponseCode::SYSTEM_ERROR;
}
int type = EVP_PKEY_type(pkey->type);
AuthorizationSet params;
add_legacy_key_authorizations(type, ¶ms);
switch (type) {
case EVP_PKEY_RSA:
params.push_back(TAG_ALGORITHM, Algorithm::RSA);
break;
case EVP_PKEY_EC:
params.push_back(TAG_ALGORITHM, Algorithm::EC);
break;
default:
ALOGW("Unsupported key type %d", type);
return ResponseCode::SYSTEM_ERROR;
}
AuthorizationSet opParams(params);
hidl_vec<uint8_t> blob;
ErrorCode error;
auto hidlCb = [&] (ErrorCode ret, const hidl_vec<uint8_t>& keyBlob,
const KeyCharacteristics& /* ignored */) {
error = ret;
if (error != ErrorCode::OK) return;
blob = keyBlob;
};
auto input = blob2hidlVec(key, keyLen);
ErrorCode rc = KS_HANDLE_HIDL_ERROR(
mDevice->importKey(params.hidl_data(), KeyFormat::PKCS8, input, hidlCb));
if (rc != ErrorCode::OK) return ResponseCode::SYSTEM_ERROR;
if (error != ErrorCode::OK) {
ALOGE("Keymaster error %d importing key pair", error);
return ResponseCode::SYSTEM_ERROR;
}
Blob keyBlob(&blob[0], blob.size(), NULL, 0, TYPE_KEYMASTER_10);
keyBlob.setEncrypted(flags & KEYSTORE_FLAG_ENCRYPTED);
keyBlob.setFallback(false);
return put(filename, &keyBlob, userId);
}
bool KeyStore::isHardwareBacked(const android::String16& /*keyType*/) const {
using ::android::hardware::hidl_string;
if (mDevice == NULL) {
ALOGW("can't get keymaster device");
return false;
}
bool isSecure = false;
auto hidlcb = [&] (bool _isSecure, bool, bool, bool, bool, const hidl_string&,
const hidl_string&) {
isSecure = _isSecure;
};
auto rc = mDevice->getHardwareFeatures(hidlcb);
if (!rc.isOk()) {
ALOGE("Communication with keymaster HAL failed while retrieving hardware features (%s)",
rc.description().c_str());
return false;
}
return isSecure;
}
ResponseCode KeyStore::getKeyForName(Blob* keyBlob, const android::String8& keyName,
const uid_t uid, const BlobType type) {
android::String8 filepath8(getKeyNameForUidWithDir(keyName, uid, type));
uid_t userId = get_user_id(uid);
ResponseCode responseCode = get(filepath8.string(), keyBlob, type, userId);
if (responseCode == ResponseCode::NO_ERROR) {
return responseCode;
}
// If this is one of the legacy UID->UID mappings, use it.
uid_t euid = get_keystore_euid(uid);
if (euid != uid) {
filepath8 = getKeyNameForUidWithDir(keyName, euid, type);
responseCode = get(filepath8.string(), keyBlob, type, userId);
if (responseCode == ResponseCode::NO_ERROR) {
return responseCode;
}
}
// They might be using a granted key.
android::String8 filename8 = getKeyName(keyName, type);
char* end;
strtoul(filename8.string(), &end, 10);
if (end[0] != '_' || end[1] == 0) {
return ResponseCode::KEY_NOT_FOUND;
}
filepath8 = android::String8::format("%s/%s", getUserState(userId)->getUserDirName(),
filename8.string());
if (!hasGrant(filepath8.string(), uid)) {
return responseCode;
}
// It is a granted key. Try to load it.
return get(filepath8.string(), keyBlob, type, userId);
}
UserState* KeyStore::getUserState(uid_t userId) {
for (android::Vector<UserState*>::iterator it(mMasterKeys.begin()); it != mMasterKeys.end();
it++) {
UserState* state = *it;
if (state->getUserId() == userId) {
return state;
}
}
UserState* userState = new UserState(userId);
if (!userState->initialize()) {
/* There's not much we can do if initialization fails. Trying to
* unlock the keystore for that user will fail as well, so any
* subsequent request for this user will just return SYSTEM_ERROR.
*/
ALOGE("User initialization failed for %u; subsuquent operations will fail", userId);
}
mMasterKeys.add(userState);
return userState;
}
UserState* KeyStore::getUserStateByUid(uid_t uid) {
uid_t userId = get_user_id(uid);
return getUserState(userId);
}
const UserState* KeyStore::getUserState(uid_t userId) const {
for (android::Vector<UserState*>::const_iterator it(mMasterKeys.begin());
it != mMasterKeys.end(); it++) {
UserState* state = *it;
if (state->getUserId() == userId) {
return state;
}
}
return NULL;
}
const UserState* KeyStore::getUserStateByUid(uid_t uid) const {
uid_t userId = get_user_id(uid);
return getUserState(userId);
}
const grant_t* KeyStore::getGrant(const char* filename, uid_t uid) const {
for (android::Vector<grant_t*>::const_iterator it(mGrants.begin()); it != mGrants.end(); it++) {
grant_t* grant = *it;
if (grant->uid == uid &&
!strcmp(reinterpret_cast<const char*>(grant->filename), filename)) {
return grant;
}
}
return NULL;
}
bool KeyStore::upgradeBlob(const char* filename, Blob* blob, const uint8_t oldVersion,
const BlobType type, uid_t uid) {
bool updated = false;
uint8_t version = oldVersion;
/* From V0 -> V1: All old types were unknown */
if (version == 0) {
ALOGV("upgrading to version 1 and setting type %d", type);
blob->setType(type);
if (type == TYPE_KEY_PAIR) {
importBlobAsKey(blob, filename, uid);
}
version = 1;
updated = true;
}
/* From V1 -> V2: All old keys were encrypted */
if (version == 1) {
ALOGV("upgrading to version 2");
blob->setEncrypted(true);
version = 2;
updated = true;
}
/*
* If we've updated, set the key blob to the right version
* and write it.
*/
if (updated) {
ALOGV("updated and writing file %s", filename);
blob->setVersion(version);
}
return updated;
}
struct BIO_Delete {
void operator()(BIO* p) const { BIO_free(p); }
};
typedef UniquePtr<BIO, BIO_Delete> Unique_BIO;
ResponseCode KeyStore::importBlobAsKey(Blob* blob, const char* filename, uid_t uid) {
// We won't even write to the blob directly with this BIO, so const_cast is okay.
Unique_BIO b(BIO_new_mem_buf(const_cast<uint8_t*>(blob->getValue()), blob->getLength()));
if (b.get() == NULL) {
ALOGE("Problem instantiating BIO");
return ResponseCode::SYSTEM_ERROR;
}
Unique_EVP_PKEY pkey(PEM_read_bio_PrivateKey(b.get(), NULL, NULL, NULL));
if (pkey.get() == NULL) {
ALOGE("Couldn't read old PEM file");
return ResponseCode::SYSTEM_ERROR;
}
Unique_PKCS8_PRIV_KEY_INFO pkcs8(EVP_PKEY2PKCS8(pkey.get()));
int len = i2d_PKCS8_PRIV_KEY_INFO(pkcs8.get(), NULL);
if (len < 0) {
ALOGE("Couldn't measure PKCS#8 length");
return ResponseCode::SYSTEM_ERROR;
}
UniquePtr<unsigned char[]> pkcs8key(new unsigned char[len]);
uint8_t* tmp = pkcs8key.get();
if (i2d_PKCS8_PRIV_KEY_INFO(pkcs8.get(), &tmp) != len) {
ALOGE("Couldn't convert to PKCS#8");
return ResponseCode::SYSTEM_ERROR;
}
ResponseCode rc = importKey(pkcs8key.get(), len, filename, get_user_id(uid),
blob->isEncrypted() ? KEYSTORE_FLAG_ENCRYPTED : KEYSTORE_FLAG_NONE);
if (rc != ResponseCode::NO_ERROR) {
return rc;
}
return get(filename, blob, TYPE_KEY_PAIR, uid);
}
void KeyStore::readMetaData() {
int in = TEMP_FAILURE_RETRY(open(sMetaDataFile, O_RDONLY));
if (in < 0) {
return;
}
size_t fileLength = readFully(in, (uint8_t*)&mMetaData, sizeof(mMetaData));
if (fileLength != sizeof(mMetaData)) {
ALOGI("Metadata file is %zd bytes (%zd experted); upgrade?", fileLength, sizeof(mMetaData));
}
close(in);
}
void KeyStore::writeMetaData() {
const char* tmpFileName = ".metadata.tmp";
int out =
TEMP_FAILURE_RETRY(open(tmpFileName, O_WRONLY | O_TRUNC | O_CREAT, S_IRUSR | S_IWUSR));
if (out < 0) {
ALOGE("couldn't write metadata file: %s", strerror(errno));
return;
}
size_t fileLength = writeFully(out, (uint8_t*)&mMetaData, sizeof(mMetaData));
if (fileLength != sizeof(mMetaData)) {
ALOGI("Could only write %zd bytes to metadata file (%zd expected)", fileLength,
sizeof(mMetaData));
}
close(out);
rename(tmpFileName, sMetaDataFile);
}
bool KeyStore::upgradeKeystore() {
bool upgraded = false;
if (mMetaData.version == 0) {
UserState* userState = getUserStateByUid(0);
// Initialize first so the directory is made.
userState->initialize();
// Migrate the old .masterkey file to user 0.
if (access(sOldMasterKey, R_OK) == 0) {
if (rename(sOldMasterKey, userState->getMasterKeyFileName()) < 0) {
ALOGE("couldn't migrate old masterkey: %s", strerror(errno));
return false;
}
}
// Initialize again in case we had a key.
userState->initialize();
// Try to migrate existing keys.
DIR* dir = opendir(".");
if (!dir) {
// Give up now; maybe we can upgrade later.
ALOGE("couldn't open keystore's directory; something is wrong");
return false;
}
struct dirent* file;
while ((file = readdir(dir)) != NULL) {
// We only care about files.
if (file->d_type != DT_REG) {
continue;
}
// Skip anything that starts with a "."
if (file->d_name[0] == '.') {
continue;
}
// Find the current file's user.
char* end;
unsigned long thisUid = strtoul(file->d_name, &end, 10);
if (end[0] != '_' || end[1] == 0) {
continue;
}
UserState* otherUser = getUserStateByUid(thisUid);
if (otherUser->getUserId() != 0) {
unlinkat(dirfd(dir), file->d_name, 0);
}
// Rename the file into user directory.
DIR* otherdir = opendir(otherUser->getUserDirName());
if (otherdir == NULL) {
ALOGW("couldn't open user directory for rename");
continue;
}
if (renameat(dirfd(dir), file->d_name, dirfd(otherdir), file->d_name) < 0) {
ALOGW("couldn't rename blob: %s: %s", file->d_name, strerror(errno));
}
closedir(otherdir);
}
closedir(dir);
mMetaData.version = 1;
upgraded = true;
}
return upgraded;
}