/*
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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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#define LOG_TAG "keystore"
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#include "keystore_utils.h"
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <log/log.h>
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#include <private/android_filesystem_config.h>
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#include <private/android_logger.h>
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#include <log/log_event_list.h>
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#include <keystore/keymaster_types.h>
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#include <keystore/keystore_client.h>
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#include "blob.h"
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size_t readFully(int fd, uint8_t* data, size_t size) {
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size_t remaining = size;
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while (remaining > 0) {
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ssize_t n = TEMP_FAILURE_RETRY(read(fd, data, remaining));
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if (n <= 0) {
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return size - remaining;
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}
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data += n;
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remaining -= n;
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}
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return size;
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}
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size_t writeFully(int fd, uint8_t* data, size_t size) {
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size_t remaining = size;
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while (remaining > 0) {
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ssize_t n = TEMP_FAILURE_RETRY(write(fd, data, remaining));
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if (n < 0) {
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ALOGW("write failed: %s", strerror(errno));
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return size - remaining;
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}
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data += n;
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remaining -= n;
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}
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if (TEMP_FAILURE_RETRY(fsync(fd)) == -1) {
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ALOGW("fsync failed: %s", strerror(errno));
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return -1;
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}
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return size;
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}
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void add_legacy_key_authorizations(int keyType, keystore::AuthorizationSet* params) {
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using namespace keystore;
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params->push_back(TAG_PURPOSE, KeyPurpose::SIGN);
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params->push_back(TAG_PURPOSE, KeyPurpose::VERIFY);
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params->push_back(TAG_PURPOSE, KeyPurpose::ENCRYPT);
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params->push_back(TAG_PURPOSE, KeyPurpose::DECRYPT);
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params->push_back(TAG_PADDING, PaddingMode::NONE);
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if (keyType == EVP_PKEY_RSA) {
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params->push_back(TAG_PADDING, PaddingMode::RSA_PKCS1_1_5_SIGN);
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params->push_back(TAG_PADDING, PaddingMode::RSA_PKCS1_1_5_ENCRYPT);
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params->push_back(TAG_PADDING, PaddingMode::RSA_PSS);
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params->push_back(TAG_PADDING, PaddingMode::RSA_OAEP);
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}
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params->push_back(TAG_DIGEST, Digest::NONE);
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params->push_back(TAG_DIGEST, Digest::MD5);
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params->push_back(TAG_DIGEST, Digest::SHA1);
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params->push_back(TAG_DIGEST, Digest::SHA_2_224);
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params->push_back(TAG_DIGEST, Digest::SHA_2_256);
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params->push_back(TAG_DIGEST, Digest::SHA_2_384);
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params->push_back(TAG_DIGEST, Digest::SHA_2_512);
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params->push_back(TAG_NO_AUTH_REQUIRED);
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params->push_back(TAG_ORIGINATION_EXPIRE_DATETIME, LLONG_MAX);
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params->push_back(TAG_USAGE_EXPIRE_DATETIME, LLONG_MAX);
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params->push_back(TAG_ACTIVE_DATETIME, 0);
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}
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uid_t get_app_id(uid_t uid) {
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return uid % AID_USER;
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}
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uid_t get_user_id(uid_t uid) {
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return uid / AID_USER;
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}
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void log_key_integrity_violation(const char* name, uid_t uid) {
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if (!__android_log_security()) return;
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android_log_event_list(SEC_TAG_KEY_INTEGRITY_VIOLATION)
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<< name << int32_t(uid) << LOG_ID_SECURITY;
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}
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namespace keystore {
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hidl_vec<uint8_t> blob2hidlVec(const Blob& blob) {
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hidl_vec<uint8_t> result(blob.getValue(), blob.getValue() + blob.getLength());
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return result;
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}
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SecurityLevel flagsToSecurityLevel(int32_t flags) {
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switch (flags & (KEYSTORE_FLAG_FALLBACK | KEYSTORE_FLAG_STRONGBOX)) {
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case KEYSTORE_FLAG_FALLBACK:
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// treating Strongbox flag as "don't care" if Fallback is set
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case (KEYSTORE_FLAG_FALLBACK | KEYSTORE_FLAG_STRONGBOX):
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return SecurityLevel::SOFTWARE;
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case KEYSTORE_FLAG_STRONGBOX:
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return SecurityLevel::STRONGBOX;
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default:
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return SecurityLevel::TRUSTED_ENVIRONMENT;
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}
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}
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uint32_t securityLevelToFlags(SecurityLevel secLevel) {
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switch (secLevel) {
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case SecurityLevel::SOFTWARE:
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return KEYSTORE_FLAG_FALLBACK;
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case SecurityLevel::STRONGBOX:
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return KEYSTORE_FLAG_STRONGBOX;
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default:
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return 0;
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}
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}
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} // namespace keystore
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