778 lines
26 KiB
C++
778 lines
26 KiB
C++
/*
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* Copyright (C) 2016 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 "keystore.h"
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#include <dirent.h>
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#include <fcntl.h>
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#include <openssl/bio.h>
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#include <utils/String16.h>
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#include <keystore/IKeystoreService.h>
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#include "keystore_utils.h"
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#include "permissions.h"
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const char* KeyStore::sOldMasterKey = ".masterkey";
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const char* KeyStore::sMetaDataFile = ".metadata";
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const android::String16 KeyStore::sRSAKeyType("RSA");
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KeyStore::KeyStore(Entropy* entropy, keymaster2_device_t* device, keymaster2_device_t* fallback)
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: mEntropy(entropy), mDevice(device), mFallbackDevice(fallback) {
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memset(&mMetaData, '\0', sizeof(mMetaData));
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}
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KeyStore::~KeyStore() {
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for (android::Vector<grant_t*>::iterator it(mGrants.begin()); it != mGrants.end(); it++) {
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delete *it;
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}
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mGrants.clear();
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for (android::Vector<UserState*>::iterator it(mMasterKeys.begin()); it != mMasterKeys.end();
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it++) {
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delete *it;
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}
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mMasterKeys.clear();
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}
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ResponseCode KeyStore::initialize() {
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readMetaData();
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if (upgradeKeystore()) {
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writeMetaData();
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}
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return ::NO_ERROR;
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}
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ResponseCode KeyStore::initializeUser(const android::String8& pw, uid_t userId) {
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UserState* userState = getUserState(userId);
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return userState->initialize(pw, mEntropy);
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}
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ResponseCode KeyStore::copyMasterKey(uid_t srcUser, uid_t dstUser) {
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UserState* userState = getUserState(dstUser);
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UserState* initState = getUserState(srcUser);
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return userState->copyMasterKey(initState);
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}
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ResponseCode KeyStore::writeMasterKey(const android::String8& pw, uid_t userId) {
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UserState* userState = getUserState(userId);
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return userState->writeMasterKey(pw, mEntropy);
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}
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ResponseCode KeyStore::readMasterKey(const android::String8& pw, uid_t userId) {
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UserState* userState = getUserState(userId);
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return userState->readMasterKey(pw, mEntropy);
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}
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/* Here is the encoding of keys. This is necessary in order to allow arbitrary
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* characters in keys. Characters in [0-~] are not encoded. Others are encoded
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* into two bytes. The first byte is one of [+-.] which represents the first
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* two bits of the character. The second byte encodes the rest of the bits into
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* [0-o]. Therefore in the worst case the length of a key gets doubled. Note
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* that Base64 cannot be used here due to the need of prefix match on keys. */
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static size_t encode_key_length(const android::String8& keyName) {
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const uint8_t* in = reinterpret_cast<const uint8_t*>(keyName.string());
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size_t length = keyName.length();
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for (int i = length; i > 0; --i, ++in) {
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if (*in < '0' || *in > '~') {
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++length;
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}
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}
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return length;
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}
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static int encode_key(char* out, const android::String8& keyName) {
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const uint8_t* in = reinterpret_cast<const uint8_t*>(keyName.string());
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size_t length = keyName.length();
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for (int i = length; i > 0; --i, ++in, ++out) {
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if (*in < '0' || *in > '~') {
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*out = '+' + (*in >> 6);
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*++out = '0' + (*in & 0x3F);
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++length;
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} else {
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*out = *in;
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}
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}
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*out = '\0';
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return length;
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}
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android::String8 KeyStore::getKeyName(const android::String8& keyName, const BlobType type) {
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char encoded[encode_key_length(keyName) + 1]; // add 1 for null char
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encode_key(encoded, keyName);
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if (type == TYPE_KEY_CHARACTERISTICS) {
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return android::String8::format(".chr_%s", encoded);
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} else {
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return android::String8(encoded);
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}
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}
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android::String8 KeyStore::getKeyNameForUid(
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const android::String8& keyName, uid_t uid, const BlobType type) {
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char encoded[encode_key_length(keyName) + 1]; // add 1 for null char
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encode_key(encoded, keyName);
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if (type == TYPE_KEY_CHARACTERISTICS) {
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return android::String8::format(".%u_chr_%s", uid, encoded);
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} else {
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return android::String8::format("%u_%s", uid, encoded);
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}
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}
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android::String8 KeyStore::getKeyNameForUidWithDir(
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const android::String8& keyName, uid_t uid, const BlobType type) {
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char encoded[encode_key_length(keyName) + 1]; // add 1 for null char
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encode_key(encoded, keyName);
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if (type == TYPE_KEY_CHARACTERISTICS) {
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return android::String8::format("%s/.%u_chr_%s", getUserStateByUid(uid)->getUserDirName(),
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uid, encoded);
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} else {
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return android::String8::format("%s/%u_%s", getUserStateByUid(uid)->getUserDirName(), uid,
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encoded);
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}
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}
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void KeyStore::resetUser(uid_t userId, bool keepUnenryptedEntries) {
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android::String8 prefix("");
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android::Vector<android::String16> aliases;
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UserState* userState = getUserState(userId);
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if (list(prefix, &aliases, userId) != ::NO_ERROR) {
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return;
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}
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for (uint32_t i = 0; i < aliases.size(); i++) {
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android::String8 filename(aliases[i]);
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filename = android::String8::format("%s/%s", userState->getUserDirName(),
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getKeyName(filename, TYPE_ANY).string());
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bool shouldDelete = true;
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if (keepUnenryptedEntries) {
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Blob blob;
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ResponseCode rc = get(filename, &blob, ::TYPE_ANY, userId);
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/* get can fail if the blob is encrypted and the state is
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* not unlocked, only skip deleting blobs that were loaded and
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* who are not encrypted. If there are blobs we fail to read for
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* other reasons err on the safe side and delete them since we
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* can't tell if they're encrypted.
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*/
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shouldDelete = !(rc == ::NO_ERROR && !blob.isEncrypted());
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}
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if (shouldDelete) {
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del(filename, ::TYPE_ANY, userId);
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// del() will fail silently if no cached characteristics are present for this alias.
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android::String8 chr_filename(aliases[i]);
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chr_filename = android::String8::format("%s/%s", userState->getUserDirName(),
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getKeyName(chr_filename,
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TYPE_KEY_CHARACTERISTICS).string());
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del(chr_filename, ::TYPE_KEY_CHARACTERISTICS, userId);
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}
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}
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if (!userState->deleteMasterKey()) {
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ALOGE("Failed to delete user %d's master key", userId);
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}
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if (!keepUnenryptedEntries) {
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if (!userState->reset()) {
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ALOGE("Failed to remove user %d's directory", userId);
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}
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}
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}
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bool KeyStore::isEmpty(uid_t userId) const {
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const UserState* userState = getUserState(userId);
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if (userState == NULL) {
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return true;
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}
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DIR* dir = opendir(userState->getUserDirName());
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if (!dir) {
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return true;
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}
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bool result = true;
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struct dirent* file;
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while ((file = readdir(dir)) != NULL) {
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// We only care about files.
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if (file->d_type != DT_REG) {
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continue;
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}
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// Skip anything that starts with a "."
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if (file->d_name[0] == '.') {
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continue;
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}
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result = false;
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break;
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}
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closedir(dir);
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return result;
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}
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void KeyStore::lock(uid_t userId) {
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UserState* userState = getUserState(userId);
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userState->zeroizeMasterKeysInMemory();
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userState->setState(STATE_LOCKED);
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}
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ResponseCode KeyStore::get(const char* filename, Blob* keyBlob, const BlobType type, uid_t userId) {
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UserState* userState = getUserState(userId);
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ResponseCode rc =
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keyBlob->readBlob(filename, userState->getDecryptionKey(), userState->getState());
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if (rc != NO_ERROR) {
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return rc;
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}
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const uint8_t version = keyBlob->getVersion();
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if (version < CURRENT_BLOB_VERSION) {
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/* If we upgrade the key, we need to write it to disk again. Then
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* it must be read it again since the blob is encrypted each time
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* it's written.
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*/
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if (upgradeBlob(filename, keyBlob, version, type, userId)) {
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if ((rc = this->put(filename, keyBlob, userId)) != NO_ERROR ||
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(rc = keyBlob->readBlob(filename, userState->getDecryptionKey(),
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userState->getState())) != NO_ERROR) {
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return rc;
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}
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}
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}
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/*
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* This will upgrade software-backed keys to hardware-backed keys when
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* the HAL for the device supports the newer key types.
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*/
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if (rc == NO_ERROR && type == TYPE_KEY_PAIR &&
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mDevice->common.module->module_api_version >= KEYMASTER_MODULE_API_VERSION_0_2 &&
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keyBlob->isFallback()) {
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ResponseCode imported =
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importKey(keyBlob->getValue(), keyBlob->getLength(), filename, userId,
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keyBlob->isEncrypted() ? KEYSTORE_FLAG_ENCRYPTED : KEYSTORE_FLAG_NONE);
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// The HAL allowed the import, reget the key to have the "fresh"
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// version.
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if (imported == NO_ERROR) {
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rc = get(filename, keyBlob, TYPE_KEY_PAIR, userId);
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}
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}
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// Keymaster 0.3 keys are valid keymaster 1.0 keys, so silently upgrade.
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if (keyBlob->getType() == TYPE_KEY_PAIR) {
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keyBlob->setType(TYPE_KEYMASTER_10);
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rc = this->put(filename, keyBlob, userId);
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}
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if (type != TYPE_ANY && keyBlob->getType() != type) {
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ALOGW("key found but type doesn't match: %d vs %d", keyBlob->getType(), type);
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return KEY_NOT_FOUND;
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}
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return rc;
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}
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ResponseCode KeyStore::put(const char* filename, Blob* keyBlob, uid_t userId) {
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UserState* userState = getUserState(userId);
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return keyBlob->writeBlob(filename, userState->getEncryptionKey(), userState->getState(),
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mEntropy);
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}
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ResponseCode KeyStore::del(const char* filename, const BlobType type, uid_t userId) {
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Blob keyBlob;
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ResponseCode rc = get(filename, &keyBlob, type, userId);
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if (rc == ::VALUE_CORRUPTED) {
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// The file is corrupt, the best we can do is rm it.
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return (unlink(filename) && errno != ENOENT) ? ::SYSTEM_ERROR : ::NO_ERROR;
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}
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if (rc != ::NO_ERROR) {
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return rc;
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}
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if (keyBlob.getType() == ::TYPE_KEY_PAIR) {
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// A device doesn't have to implement delete_key.
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if (mDevice->delete_key != NULL && !keyBlob.isFallback()) {
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keymaster_key_blob_t blob = {keyBlob.getValue(),
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static_cast<size_t>(keyBlob.getLength())};
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if (mDevice->delete_key(mDevice, &blob)) {
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rc = ::SYSTEM_ERROR;
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}
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}
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}
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if (keyBlob.getType() == ::TYPE_KEYMASTER_10) {
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auto* dev = getDeviceForBlob(keyBlob);
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if (dev->delete_key) {
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keymaster_key_blob_t blob;
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blob.key_material = keyBlob.getValue();
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blob.key_material_size = keyBlob.getLength();
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dev->delete_key(dev, &blob);
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}
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}
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if (rc != ::NO_ERROR) {
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return rc;
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}
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return (unlink(filename) && errno != ENOENT) ? ::SYSTEM_ERROR : ::NO_ERROR;
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}
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/*
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* Converts from the "escaped" format on disk to actual name.
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* This will be smaller than the input string.
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*
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* Characters that should combine with the next at the end will be truncated.
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*/
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static size_t decode_key_length(const char* in, size_t length) {
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size_t outLength = 0;
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for (const char* end = in + length; in < end; in++) {
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/* This combines with the next character. */
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if (*in < '0' || *in > '~') {
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continue;
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}
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outLength++;
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}
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return outLength;
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}
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static void decode_key(char* out, const char* in, size_t length) {
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for (const char* end = in + length; in < end; in++) {
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if (*in < '0' || *in > '~') {
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/* Truncate combining characters at the end. */
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if (in + 1 >= end) {
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break;
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}
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*out = (*in++ - '+') << 6;
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*out++ |= (*in - '0') & 0x3F;
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} else {
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*out++ = *in;
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}
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}
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*out = '\0';
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}
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ResponseCode KeyStore::list(const android::String8& prefix,
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android::Vector<android::String16>* matches, uid_t userId) {
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UserState* userState = getUserState(userId);
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size_t n = prefix.length();
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DIR* dir = opendir(userState->getUserDirName());
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if (!dir) {
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ALOGW("can't open directory for user: %s", strerror(errno));
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return ::SYSTEM_ERROR;
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}
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struct dirent* file;
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while ((file = readdir(dir)) != NULL) {
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// We only care about files.
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if (file->d_type != DT_REG) {
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continue;
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}
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// Skip anything that starts with a "."
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if (file->d_name[0] == '.') {
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continue;
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}
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if (!strncmp(prefix.string(), file->d_name, n)) {
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const char* p = &file->d_name[n];
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size_t plen = strlen(p);
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size_t extra = decode_key_length(p, plen);
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char* match = (char*)malloc(extra + 1);
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if (match != NULL) {
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decode_key(match, p, plen);
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matches->push(android::String16(match, extra));
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free(match);
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} else {
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ALOGW("could not allocate match of size %zd", extra);
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}
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}
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}
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closedir(dir);
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return ::NO_ERROR;
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}
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void KeyStore::addGrant(const char* filename, uid_t granteeUid) {
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const grant_t* existing = getGrant(filename, granteeUid);
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if (existing == NULL) {
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grant_t* grant = new grant_t;
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grant->uid = granteeUid;
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grant->filename = reinterpret_cast<const uint8_t*>(strdup(filename));
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mGrants.add(grant);
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}
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}
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bool KeyStore::removeGrant(const char* filename, uid_t granteeUid) {
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for (android::Vector<grant_t*>::iterator it(mGrants.begin()); it != mGrants.end(); it++) {
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grant_t* grant = *it;
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if (grant->uid == granteeUid &&
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!strcmp(reinterpret_cast<const char*>(grant->filename), filename)) {
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mGrants.erase(it);
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return true;
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}
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}
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return false;
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}
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ResponseCode KeyStore::importKey(const uint8_t* key, size_t keyLen, const char* filename,
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uid_t userId, int32_t flags) {
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Unique_PKCS8_PRIV_KEY_INFO pkcs8(d2i_PKCS8_PRIV_KEY_INFO(NULL, &key, keyLen));
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if (!pkcs8.get()) {
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return ::SYSTEM_ERROR;
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}
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Unique_EVP_PKEY pkey(EVP_PKCS82PKEY(pkcs8.get()));
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if (!pkey.get()) {
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return ::SYSTEM_ERROR;
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}
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int type = EVP_PKEY_type(pkey->type);
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android::KeymasterArguments params;
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add_legacy_key_authorizations(type, ¶ms.params);
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switch (type) {
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case EVP_PKEY_RSA:
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params.params.push_back(keymaster_param_enum(KM_TAG_ALGORITHM, KM_ALGORITHM_RSA));
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break;
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case EVP_PKEY_EC:
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params.params.push_back(keymaster_param_enum(KM_TAG_ALGORITHM, KM_ALGORITHM_EC));
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break;
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default:
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ALOGW("Unsupported key type %d", type);
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return ::SYSTEM_ERROR;
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}
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std::vector<keymaster_key_param_t> opParams(params.params);
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const keymaster_key_param_set_t inParams = {opParams.data(), opParams.size()};
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keymaster_blob_t input = {key, keyLen};
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keymaster_key_blob_t blob = {nullptr, 0};
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bool isFallback = false;
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keymaster_error_t error = mDevice->import_key(mDevice, &inParams, KM_KEY_FORMAT_PKCS8, &input,
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&blob, NULL /* characteristics */);
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if (error != KM_ERROR_OK) {
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ALOGE("Keymaster error %d importing key pair, falling back", error);
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/*
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* There should be no way to get here. Fallback shouldn't ever really happen
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* because the main device may be many (SW, KM0/SW hybrid, KM1/SW hybrid), but it must
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* provide full support of the API. In any case, we'll do the fallback just for
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* consistency... and I suppose to cover for broken HW implementations.
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*/
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error = mFallbackDevice->import_key(mFallbackDevice, &inParams, KM_KEY_FORMAT_PKCS8, &input,
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&blob, NULL /* characteristics */);
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isFallback = true;
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if (error) {
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ALOGE("Keymaster error while importing key pair with fallback: %d", error);
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return SYSTEM_ERROR;
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}
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}
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Blob keyBlob(blob.key_material, blob.key_material_size, NULL, 0, TYPE_KEYMASTER_10);
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free(const_cast<uint8_t*>(blob.key_material));
|
|
|
|
keyBlob.setEncrypted(flags & KEYSTORE_FLAG_ENCRYPTED);
|
|
keyBlob.setFallback(isFallback);
|
|
|
|
return put(filename, &keyBlob, userId);
|
|
}
|
|
|
|
bool KeyStore::isHardwareBacked(const android::String16& keyType) const {
|
|
if (mDevice == NULL) {
|
|
ALOGW("can't get keymaster device");
|
|
return false;
|
|
}
|
|
|
|
if (sRSAKeyType == keyType) {
|
|
return (mDevice->flags & KEYMASTER_SOFTWARE_ONLY) == 0;
|
|
} else {
|
|
return (mDevice->flags & KEYMASTER_SOFTWARE_ONLY) == 0 &&
|
|
(mDevice->common.module->module_api_version >= KEYMASTER_MODULE_API_VERSION_0_2);
|
|
}
|
|
}
|
|
|
|
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 == 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 == 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 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 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 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 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 SYSTEM_ERROR;
|
|
}
|
|
|
|
ResponseCode rc = importKey(pkcs8key.get(), len, filename, get_user_id(uid),
|
|
blob->isEncrypted() ? KEYSTORE_FLAG_ENCRYPTED : KEYSTORE_FLAG_NONE);
|
|
if (rc != 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;
|
|
}
|