keymaster_enforcement.cpp revision b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7
14dc536694c5044a624d112f69627856b91d3f82eShawn Willden/* 24dc536694c5044a624d112f69627856b91d3f82eShawn Willden * Copyright (C) 2014 The Android Open Source Project 34dc536694c5044a624d112f69627856b91d3f82eShawn Willden * 44dc536694c5044a624d112f69627856b91d3f82eShawn Willden * Licensed under the Apache License, Version 2.0 (the "License"); 54dc536694c5044a624d112f69627856b91d3f82eShawn Willden * you may not use this file except in compliance with the License. 64dc536694c5044a624d112f69627856b91d3f82eShawn Willden * You may obtain a copy of the License at 74dc536694c5044a624d112f69627856b91d3f82eShawn Willden * 84dc536694c5044a624d112f69627856b91d3f82eShawn Willden * http://www.apache.org/licenses/LICENSE-2.0 94dc536694c5044a624d112f69627856b91d3f82eShawn Willden * 104dc536694c5044a624d112f69627856b91d3f82eShawn Willden * Unless required by applicable law or agreed to in writing, software 114dc536694c5044a624d112f69627856b91d3f82eShawn Willden * distributed under the License is distributed on an "AS IS" BASIS, 124dc536694c5044a624d112f69627856b91d3f82eShawn Willden * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 134dc536694c5044a624d112f69627856b91d3f82eShawn Willden * See the License for the specific language governing permissions and 144dc536694c5044a624d112f69627856b91d3f82eShawn Willden * limitations under the License. 154dc536694c5044a624d112f69627856b91d3f82eShawn Willden */ 164dc536694c5044a624d112f69627856b91d3f82eShawn Willden 17b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden#include <keymaster/keymaster_enforcement.h> 18b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 19b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden#include <assert.h> 204dc536694c5044a624d112f69627856b91d3f82eShawn Willden#include <string.h> 214dc536694c5044a624d112f69627856b91d3f82eShawn Willden 22b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden#include <limits> 23b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 24b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden#include <openssl/evp.h> 25b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 26b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden#include <hardware/hw_auth_token.h> 27b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden#include <keymaster/android_keymaster_utils.h> 28b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden#include <keymaster/logger.h> 29b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 30b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdenusing android::List; 314dc536694c5044a624d112f69627856b91d3f82eShawn Willden 324dc536694c5044a624d112f69627856b91d3f82eShawn Willdennamespace keymaster { 334dc536694c5044a624d112f69627856b91d3f82eShawn Willden 34b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdenbool is_public_key_algorithm(const AuthorizationSet& auth_set) { 35b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden keymaster_algorithm_t algorithm; 36b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return auth_set.GetTagValue(TAG_ALGORITHM, &algorithm) && 37b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden (algorithm == KM_ALGORITHM_RSA || algorithm == KM_ALGORITHM_EC); 384dc536694c5044a624d112f69627856b91d3f82eShawn Willden} 394dc536694c5044a624d112f69627856b91d3f82eShawn Willden 40b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdenstatic keymaster_error_t authorized_purpose(const keymaster_purpose_t purpose, 41b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden const AuthorizationSet& auth_set) { 42b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden switch (purpose) { 43b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_PURPOSE_VERIFY: 44b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_PURPOSE_ENCRYPT: 45b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (is_public_key_algorithm(auth_set) || auth_set.Contains(TAG_PURPOSE, purpose)) 46b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_OK; 47b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_INCOMPATIBLE_PURPOSE; 484dc536694c5044a624d112f69627856b91d3f82eShawn Willden 49b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_PURPOSE_SIGN: 50b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_PURPOSE_DECRYPT: 51b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (auth_set.Contains(TAG_PURPOSE, purpose)) 52b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_OK; 53b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_INCOMPATIBLE_PURPOSE; 544dc536694c5044a624d112f69627856b91d3f82eShawn Willden 55b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden default: 56b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_UNSUPPORTED_PURPOSE; 57b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden } 58b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden} 594dc536694c5044a624d112f69627856b91d3f82eShawn Willden 60b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdeninline bool is_origination_purpose(keymaster_purpose_t purpose) { 61b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return purpose == KM_PURPOSE_ENCRYPT || purpose == KM_PURPOSE_SIGN; 62b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden} 634dc536694c5044a624d112f69627856b91d3f82eShawn Willden 64b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdeninline bool is_usage_purpose(keymaster_purpose_t purpose) { 65b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return purpose == KM_PURPOSE_DECRYPT || purpose == KM_PURPOSE_VERIFY; 66b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden} 674dc536694c5044a624d112f69627856b91d3f82eShawn Willden 68b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdeninline bool can_skip_authentication(bool is_begin_operation, bool is_auth_per_op_key) { 69b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden // Durign begin with auth-per-op keys, we don't require authentication because it can't be 70b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden // performed until after begin returns the operation handle used to for the authentication 71b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden // challenge. 72b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return is_begin_operation && is_auth_per_op_key; 73b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden} 744dc536694c5044a624d112f69627856b91d3f82eShawn Willden 75b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdenkeymaster_error_t KeymasterEnforcement::AuthorizeOperation(const keymaster_purpose_t purpose, 76b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden const km_id_t keyid, 77b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden const AuthorizationSet& auth_set, 78b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden const AuthorizationSet& operation_params, 79b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden keymaster_operation_handle_t op_handle, 80b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden bool is_begin_operation) { 81b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden // Find some entries that may be needed to handle KM_TAG_USER_SECURE_ID 82b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden int auth_timeout_index = -1; 83b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden int auth_type_index = -1; 84b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden int no_auth_required_index = -1; 85b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden for (size_t pos = 0; pos < auth_set.size(); ++pos) { 86b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden switch (auth_set[pos].tag) { 87b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_TAG_AUTH_TIMEOUT: 88b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden auth_timeout_index = pos; 89b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden break; 90b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_TAG_USER_AUTH_TYPE: 91b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden auth_type_index = pos; 92b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden break; 93b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_TAG_NO_AUTH_REQUIRED: 94b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden no_auth_required_index = pos; 95b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden break; 96b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden default: 97b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden break; 98b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden } 994dc536694c5044a624d112f69627856b91d3f82eShawn Willden } 1004dc536694c5044a624d112f69627856b91d3f82eShawn Willden 101b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden keymaster_error_t error = authorized_purpose(purpose, auth_set); 102b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (error != KM_ERROR_OK) 103b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return error; 104b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 105b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden // If successful, and if key has a min time between ops, this will be set to the time limit 106b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden uint32_t min_ops_timeout = UINT32_MAX; 1074dc536694c5044a624d112f69627856b91d3f82eShawn Willden 108b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden bool update_access_count = false; 109b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden bool found_caller_nonce = false; 110b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden bool authentication_required = false; 111b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden bool auth_token_matched = false; 112b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 113b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden for (auto& param : auth_set) { 114d9d7acff7c43f52ebd038eb77afd67d597844b35Shawn Willden 115d9d7acff7c43f52ebd038eb77afd67d597844b35Shawn Willden // KM_TAG_PADDING_OLD and KM_TAG_DIGEST_OLD aren't actually members of the enum, so we can't 116d9d7acff7c43f52ebd038eb77afd67d597844b35Shawn Willden // switch on them. There's nothing to validate for them, though, so just ignore them. 117d9d7acff7c43f52ebd038eb77afd67d597844b35Shawn Willden if (param.tag == KM_TAG_PADDING_OLD || param.tag == KM_TAG_DIGEST_OLD) 118d9d7acff7c43f52ebd038eb77afd67d597844b35Shawn Willden continue; 119d9d7acff7c43f52ebd038eb77afd67d597844b35Shawn Willden 1204dc536694c5044a624d112f69627856b91d3f82eShawn Willden switch (param.tag) { 121b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 1224dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_ACTIVE_DATETIME: 123b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (!activation_date_valid(param.date_time)) 124b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_KEY_NOT_YET_VALID; 1254dc536694c5044a624d112f69627856b91d3f82eShawn Willden break; 126b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 1274dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_ORIGINATION_EXPIRE_DATETIME: 128b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (is_origination_purpose(purpose) && expiration_date_passed(param.date_time)) 129b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_KEY_EXPIRED; 1304dc536694c5044a624d112f69627856b91d3f82eShawn Willden break; 131b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 1324dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_USAGE_EXPIRE_DATETIME: 133b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (is_usage_purpose(purpose) && expiration_date_passed(param.date_time)) 134b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_KEY_EXPIRED; 1354dc536694c5044a624d112f69627856b91d3f82eShawn Willden break; 136b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 1374dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_MIN_SECONDS_BETWEEN_OPS: 138b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden min_ops_timeout = param.integer; 139b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (!MinTimeBetweenOpsPassed(min_ops_timeout, keyid)) 140b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_KEY_RATE_LIMIT_EXCEEDED; 1414dc536694c5044a624d112f69627856b91d3f82eShawn Willden break; 142b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 1434dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_MAX_USES_PER_BOOT: 144b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden update_access_count = true; 145b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (!MaxUsesPerBootNotExceeded(keyid, param.integer)) 146b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_KEY_MAX_OPS_EXCEEDED; 1474dc536694c5044a624d112f69627856b91d3f82eShawn Willden break; 148b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 149eb63b9799eadcaa6ef206f8b804d7432e0dab14aShawn Willden case KM_TAG_USER_SECURE_ID: 150b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (no_auth_required_index != -1) { 151b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden // Key has both KM_TAG_USER_SECURE_ID and KM_TAG_NO_AUTH_REQUIRED 152b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_INVALID_KEY_BLOB; 153b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden } else if (!can_skip_authentication(is_begin_operation, auth_timeout_index == -1) || 154b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden operation_params.find(KM_TAG_AUTH_TOKEN) != -1) { 155b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden authentication_required = true; 156b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (AuthTokenMatches(auth_set, operation_params, param.long_integer, 157b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden auth_type_index, auth_timeout_index, op_handle, 158b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden is_begin_operation)) 159b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden auth_token_matched = true; 160b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden } 1614dc536694c5044a624d112f69627856b91d3f82eShawn Willden break; 162b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 1634dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_CALLER_NONCE: 164b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden found_caller_nonce = true; 1654dc536694c5044a624d112f69627856b91d3f82eShawn Willden break; 1664dc536694c5044a624d112f69627856b91d3f82eShawn Willden 167b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden /* Tags should never be in key auths. */ 1684dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_INVALID: 169b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_TAG_AUTH_TOKEN: 170b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_TAG_ROOT_OF_TRUST: 171b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_TAG_APPLICATION_DATA: 172b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_INVALID_KEY_BLOB; 1734dc536694c5044a624d112f69627856b91d3f82eShawn Willden 1744dc536694c5044a624d112f69627856b91d3f82eShawn Willden /* Tags used for cryptographic parameters. */ 1754dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_PURPOSE: 1764dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_ALGORITHM: 1774dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_KEY_SIZE: 1784dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_BLOCK_MODE: 1794dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_DIGEST: 1804dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_MAC_LENGTH: 1814dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_PADDING: 1824dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_NONCE: 1834dc536694c5044a624d112f69627856b91d3f82eShawn Willden 184125e4866f98eb1b5ad65a563afd34aca215d983dShawn Willden /* Tags not used for operations. */ 1854dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_BLOB_USAGE_REQUIREMENTS: 1864dc536694c5044a624d112f69627856b91d3f82eShawn Willden 1874dc536694c5044a624d112f69627856b91d3f82eShawn Willden /* Algorithm specific parameters not used for access control. */ 1884dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_RSA_PUBLIC_EXPONENT: 1894dc536694c5044a624d112f69627856b91d3f82eShawn Willden 1904dc536694c5044a624d112f69627856b91d3f82eShawn Willden /* Informational tags. */ 1914dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_CREATION_DATETIME: 1924dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_ORIGIN: 1934dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_ROLLBACK_RESISTANT: 194b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 195b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden /* Tags handled when KM_TAG_USER_SECURE_ID is handled */ 196b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_TAG_NO_AUTH_REQUIRED: 197b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_TAG_USER_AUTH_TYPE: 198b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_TAG_AUTH_TIMEOUT: 1994dc536694c5044a624d112f69627856b91d3f82eShawn Willden 2004dc536694c5044a624d112f69627856b91d3f82eShawn Willden /* Tag to provide data to operations. */ 2014dc536694c5044a624d112f69627856b91d3f82eShawn Willden case KM_TAG_ASSOCIATED_DATA: 202b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 203b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden /* Ignored pending removal */ 204b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_TAG_ALL_APPLICATIONS: 205b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_TAG_APPLICATION_ID: 206b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_TAG_USER_ID: 207b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_TAG_ALL_USERS: 208bcd6b99ad5eb0e010f611facb55358e52cbde071Shawn Willden break; 2094dc536694c5044a624d112f69627856b91d3f82eShawn Willden 210b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden case KM_TAG_BOOTLOADER_ONLY: 211b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_INVALID_KEY_BLOB; 2124dc536694c5044a624d112f69627856b91d3f82eShawn Willden } 2134dc536694c5044a624d112f69627856b91d3f82eShawn Willden } 2144dc536694c5044a624d112f69627856b91d3f82eShawn Willden 215b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (authentication_required && !auth_token_matched) { 216b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden LOG_E("Auth required but no matching auth token found", 0); 217b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_KEY_USER_NOT_AUTHENTICATED; 2184dc536694c5044a624d112f69627856b91d3f82eShawn Willden } 2194dc536694c5044a624d112f69627856b91d3f82eShawn Willden 220b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (!found_caller_nonce && operation_params.find(KM_TAG_NONCE) != -1) 221b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_CALLER_NONCE_PROHIBITED; 2224dc536694c5044a624d112f69627856b91d3f82eShawn Willden 223b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (min_ops_timeout != UINT32_MAX && 224b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden !access_time_map_.UpdateKeyAccessTime(keyid, get_current_time(), min_ops_timeout)) { 225b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden LOG_E("Rate-limited keys table full. Entries will time out.", 0); 226b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_TOO_MANY_OPERATIONS; 2274dc536694c5044a624d112f69627856b91d3f82eShawn Willden } 2284dc536694c5044a624d112f69627856b91d3f82eShawn Willden 229b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (update_access_count && !access_count_map_.IncrementKeyAccessCount(keyid)) { 230b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden LOG_E("Usage count-limited keys table full, until reboot.", 0); 231b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return KM_ERROR_TOO_MANY_OPERATIONS; 2324dc536694c5044a624d112f69627856b91d3f82eShawn Willden } 233b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 2344dc536694c5044a624d112f69627856b91d3f82eShawn Willden return KM_ERROR_OK; 2354dc536694c5044a624d112f69627856b91d3f82eShawn Willden} 2364dc536694c5044a624d112f69627856b91d3f82eShawn Willden 237b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdenclass EvpMdCtx { 238b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden public: 239b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden EvpMdCtx() { EVP_MD_CTX_init(&ctx_); } 240b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden ~EvpMdCtx() { EVP_MD_CTX_cleanup(&ctx_); } 2414dc536694c5044a624d112f69627856b91d3f82eShawn Willden 242b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden EVP_MD_CTX* get() { return &ctx_; } 2434dc536694c5044a624d112f69627856b91d3f82eShawn Willden 244b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden private: 245b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden EVP_MD_CTX ctx_; 246b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden}; 2474dc536694c5044a624d112f69627856b91d3f82eShawn Willden 248b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden/* static */ 249b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdenbool KeymasterEnforcement::CreateKeyId(const keymaster_key_blob_t& key_blob, km_id_t* keyid) { 250b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden EvpMdCtx ctx; 2514dc536694c5044a624d112f69627856b91d3f82eShawn Willden 252b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden uint8_t hash[EVP_MAX_MD_SIZE]; 253b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden unsigned int hash_len; 254b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (EVP_DigestInit_ex(ctx.get(), EVP_sha256(), nullptr /* ENGINE */) && 255b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden EVP_DigestUpdate(ctx.get(), key_blob.key_material, key_blob.key_material_size) && 256b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden EVP_DigestFinal_ex(ctx.get(), hash, &hash_len)) { 257b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden assert(hash_len >= sizeof(*keyid)); 258b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden memcpy(keyid, hash, sizeof(*keyid)); 259b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return true; 2604dc536694c5044a624d112f69627856b91d3f82eShawn Willden } 261b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 262b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return false; 2634dc536694c5044a624d112f69627856b91d3f82eShawn Willden} 2644dc536694c5044a624d112f69627856b91d3f82eShawn Willden 265b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdenbool KeymasterEnforcement::MinTimeBetweenOpsPassed(uint32_t min_time_between, const km_id_t keyid) { 266b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden uint32_t last_access_time; 267b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (!access_time_map_.LastKeyAccessTime(keyid, &last_access_time)) 268b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return true; 269b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return min_time_between <= static_cast<int64_t>(get_current_time()) - last_access_time; 2704dc536694c5044a624d112f69627856b91d3f82eShawn Willden} 2714dc536694c5044a624d112f69627856b91d3f82eShawn Willden 272b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdenbool KeymasterEnforcement::MaxUsesPerBootNotExceeded(const km_id_t keyid, uint32_t max_uses) { 273b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden uint32_t key_access_count; 274b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (!access_count_map_.KeyAccessCount(keyid, &key_access_count)) 275b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return true; 276b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return key_access_count < max_uses; 277b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden} 2784dc536694c5044a624d112f69627856b91d3f82eShawn Willden 279b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdenbool KeymasterEnforcement::AuthTokenMatches(const AuthorizationSet& auth_set, 280b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden const AuthorizationSet& operation_params, 281b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden const uint64_t user_secure_id, 282b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden const int auth_type_index, const int auth_timeout_index, 283b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden const keymaster_operation_handle_t op_handle, 284b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden bool is_begin_operation) const { 285b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden assert(auth_type_index < static_cast<int>(auth_set.size())); 286b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden assert(auth_timeout_index < static_cast<int>(auth_set.size())); 287b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 288b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden keymaster_blob_t auth_token_blob; 289b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (!operation_params.GetTagValue(TAG_AUTH_TOKEN, &auth_token_blob)) { 290b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden LOG_E("Authentication required, but auth token not provided", 0); 291b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return false; 2924dc536694c5044a624d112f69627856b91d3f82eShawn Willden } 2934dc536694c5044a624d112f69627856b91d3f82eShawn Willden 294b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (auth_token_blob.data_length != sizeof(hw_auth_token_t)) { 295b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden LOG_E("Bug: Auth token is the wrong size (%d expected, %d found)", sizeof(hw_auth_token_t), 296b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden auth_token_blob.data_length); 297b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return false; 2984dc536694c5044a624d112f69627856b91d3f82eShawn Willden } 2994dc536694c5044a624d112f69627856b91d3f82eShawn Willden 300b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden hw_auth_token_t auth_token; 301b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden memcpy(&auth_token, auth_token_blob.data, sizeof(hw_auth_token_t)); 302b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (auth_token.version != HW_AUTH_TOKEN_VERSION) { 303b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden LOG_E("Bug: Auth token is the version %d (or is not an auth token). Expected %d", 304b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden auth_token.version, HW_AUTH_TOKEN_VERSION); 305b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return false; 306b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden } 3074dc536694c5044a624d112f69627856b91d3f82eShawn Willden 308b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (!ValidateTokenSignature(auth_token)) { 309b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden LOG_E("Auth token signature invalid", 0); 310b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return false; 311b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden } 3124dc536694c5044a624d112f69627856b91d3f82eShawn Willden 313b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (auth_timeout_index == -1 && op_handle && op_handle != auth_token.challenge) { 314b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden LOG_E("Auth token has the challenge %llu, need %llu", auth_token.challenge, op_handle); 315b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return false; 316b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden } 3174dc536694c5044a624d112f69627856b91d3f82eShawn Willden 318b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (user_secure_id != auth_token.user_id && user_secure_id != auth_token.authenticator_id) { 319b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden LOG_I("Auth token SIDs %llu and %llu do not match key SID %llu", auth_token.user_id, 320b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden auth_token.authenticator_id, user_secure_id); 321b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return false; 322b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden } 3234dc536694c5044a624d112f69627856b91d3f82eShawn Willden 324b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (auth_type_index < 0 || auth_type_index > static_cast<int>(auth_set.size())) { 325b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden LOG_E("Auth required but no auth type found", 0); 326b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return false; 327b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden } 3284dc536694c5044a624d112f69627856b91d3f82eShawn Willden 329b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden assert(auth_set[auth_type_index].tag == KM_TAG_USER_AUTH_TYPE); 330b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (auth_set[auth_type_index].tag != KM_TAG_USER_AUTH_TYPE) 331b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return false; 3324dc536694c5044a624d112f69627856b91d3f82eShawn Willden 333b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden uint32_t key_auth_type_mask = auth_set[auth_type_index].integer; 334b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden uint32_t token_auth_type = ntoh(auth_token.authenticator_type); 335b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if ((key_auth_type_mask & token_auth_type) == 0) { 336b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden LOG_E("Key requires match of auth type mask 0%uo, but token contained 0%uo", 337b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden key_auth_type_mask, token_auth_type); 338b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return false; 3394dc536694c5044a624d112f69627856b91d3f82eShawn Willden } 3404dc536694c5044a624d112f69627856b91d3f82eShawn Willden 341b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (auth_timeout_index != -1 && is_begin_operation) { 342b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden assert(auth_set[auth_timeout_index].tag == KM_TAG_AUTH_TIMEOUT); 343b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (auth_set[auth_timeout_index].tag != KM_TAG_AUTH_TIMEOUT) 344b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return false; 3454dc536694c5044a624d112f69627856b91d3f82eShawn Willden 346b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (auth_token_timed_out(auth_token, auth_set[auth_timeout_index].integer)) { 347b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden LOG_E("Auth token has timed out", 0); 3484dc536694c5044a624d112f69627856b91d3f82eShawn Willden return false; 3494dc536694c5044a624d112f69627856b91d3f82eShawn Willden } 3504dc536694c5044a624d112f69627856b91d3f82eShawn Willden } 3514dc536694c5044a624d112f69627856b91d3f82eShawn Willden 352b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden // Survived the whole gauntlet. We have authentage! 3534dc536694c5044a624d112f69627856b91d3f82eShawn Willden return true; 3544dc536694c5044a624d112f69627856b91d3f82eShawn Willden} 3554dc536694c5044a624d112f69627856b91d3f82eShawn Willden 356b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdenbool KeymasterEnforcement::AccessTimeMap::LastKeyAccessTime(km_id_t keyid, 357b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden uint32_t* last_access_time) const { 358b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden for (auto& entry : last_access_list_) 359b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (entry.keyid == keyid) { 360b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden *last_access_time = entry.access_time; 361b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return true; 362b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden } 363b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return false; 364b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden} 3654dc536694c5044a624d112f69627856b91d3f82eShawn Willden 366b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdenbool KeymasterEnforcement::AccessTimeMap::UpdateKeyAccessTime(km_id_t keyid, uint32_t current_time, 367b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden uint32_t timeout) { 368b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden List<AccessTime>::iterator iter; 369b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden for (iter = last_access_list_.begin(); iter != last_access_list_.end();) { 370b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (iter->keyid == keyid) { 371b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden iter->access_time = current_time; 372b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return true; 3734dc536694c5044a624d112f69627856b91d3f82eShawn Willden } 374b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden 375b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden // Expire entry if possible. 376b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden assert(current_time >= iter->access_time); 377b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (current_time - iter->access_time >= iter->timeout) 378b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden iter = last_access_list_.erase(iter); 379b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden else 380b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden ++iter; 3814dc536694c5044a624d112f69627856b91d3f82eShawn Willden } 3824dc536694c5044a624d112f69627856b91d3f82eShawn Willden 383b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (last_access_list_.size() >= max_size_) 384b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return false; 3854dc536694c5044a624d112f69627856b91d3f82eShawn Willden 386b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden AccessTime new_entry; 387b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden new_entry.keyid = keyid; 388b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden new_entry.access_time = current_time; 389b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden new_entry.timeout = timeout; 390b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden last_access_list_.push_front(new_entry); 391b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return true; 3924dc536694c5044a624d112f69627856b91d3f82eShawn Willden} 3934dc536694c5044a624d112f69627856b91d3f82eShawn Willden 394b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdenbool KeymasterEnforcement::AccessCountMap::KeyAccessCount(km_id_t keyid, uint32_t* count) const { 395b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden for (auto& entry : access_count_list_) 396b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (entry.keyid == keyid) { 397b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden *count = entry.access_count; 398b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return true; 399b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden } 400b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return false; 4014dc536694c5044a624d112f69627856b91d3f82eShawn Willden} 4024dc536694c5044a624d112f69627856b91d3f82eShawn Willden 403b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdentemplate <typename T> T max_value(T) { 404b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return std::numeric_limits<T>::max(); 4054dc536694c5044a624d112f69627856b91d3f82eShawn Willden} 4064dc536694c5044a624d112f69627856b91d3f82eShawn Willden 407b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willdenbool KeymasterEnforcement::AccessCountMap::IncrementKeyAccessCount(km_id_t keyid) { 408b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden for (auto& entry : access_count_list_) 409b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (entry.keyid == keyid) { 410b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (entry.access_count < max_value(entry.access_count)) 411b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden ++entry.access_count; 412b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return true; 413b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden } 4144dc536694c5044a624d112f69627856b91d3f82eShawn Willden 415b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden if (access_count_list_.size() >= max_size_) 416b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return false; 4174dc536694c5044a624d112f69627856b91d3f82eShawn Willden 418b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden AccessCount new_entry; 419b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden new_entry.keyid = keyid; 420b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden new_entry.access_count = 1; 421b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden access_count_list_.push_front(new_entry); 422b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden return true; 423b5508298cdb1d42eaf8c81aa8a6ac2cbfdeef3c7Shawn Willden} 4244dc536694c5044a624d112f69627856b91d3f82eShawn Willden}; /* namespace keymaster */ 425