1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #define LOG_TAG "keystore" 18 19 #include "keystore_utils.h" 20 21 #include <errno.h> 22 #include <string.h> 23 #include <unistd.h> 24 25 #include <cutils/log.h> 26 #include <private/android_filesystem_config.h> 27 28 #include <keymaster/android_keymaster_utils.h> 29 30 size_t readFully(int fd, uint8_t* data, size_t size) { 31 size_t remaining = size; 32 while (remaining > 0) { 33 ssize_t n = TEMP_FAILURE_RETRY(read(fd, data, remaining)); 34 if (n <= 0) { 35 return size - remaining; 36 } 37 data += n; 38 remaining -= n; 39 } 40 return size; 41 } 42 43 size_t writeFully(int fd, uint8_t* data, size_t size) { 44 size_t remaining = size; 45 while (remaining > 0) { 46 ssize_t n = TEMP_FAILURE_RETRY(write(fd, data, remaining)); 47 if (n < 0) { 48 ALOGW("write failed: %s", strerror(errno)); 49 return size - remaining; 50 } 51 data += n; 52 remaining -= n; 53 } 54 return size; 55 } 56 57 void add_legacy_key_authorizations(int keyType, std::vector<keymaster_key_param_t>* params) { 58 params->push_back(keymaster_param_enum(KM_TAG_PURPOSE, KM_PURPOSE_SIGN)); 59 params->push_back(keymaster_param_enum(KM_TAG_PURPOSE, KM_PURPOSE_VERIFY)); 60 params->push_back(keymaster_param_enum(KM_TAG_PURPOSE, KM_PURPOSE_ENCRYPT)); 61 params->push_back(keymaster_param_enum(KM_TAG_PURPOSE, KM_PURPOSE_DECRYPT)); 62 params->push_back(keymaster_param_enum(KM_TAG_PADDING, KM_PAD_NONE)); 63 if (keyType == EVP_PKEY_RSA) { 64 params->push_back(keymaster_param_enum(KM_TAG_PADDING, KM_PAD_RSA_PKCS1_1_5_SIGN)); 65 params->push_back(keymaster_param_enum(KM_TAG_PADDING, KM_PAD_RSA_PKCS1_1_5_ENCRYPT)); 66 params->push_back(keymaster_param_enum(KM_TAG_PADDING, KM_PAD_RSA_PSS)); 67 params->push_back(keymaster_param_enum(KM_TAG_PADDING, KM_PAD_RSA_OAEP)); 68 } 69 params->push_back(keymaster_param_enum(KM_TAG_DIGEST, KM_DIGEST_NONE)); 70 params->push_back(keymaster_param_enum(KM_TAG_DIGEST, KM_DIGEST_MD5)); 71 params->push_back(keymaster_param_enum(KM_TAG_DIGEST, KM_DIGEST_SHA1)); 72 params->push_back(keymaster_param_enum(KM_TAG_DIGEST, KM_DIGEST_SHA_2_224)); 73 params->push_back(keymaster_param_enum(KM_TAG_DIGEST, KM_DIGEST_SHA_2_256)); 74 params->push_back(keymaster_param_enum(KM_TAG_DIGEST, KM_DIGEST_SHA_2_384)); 75 params->push_back(keymaster_param_enum(KM_TAG_DIGEST, KM_DIGEST_SHA_2_512)); 76 params->push_back(keymaster_param_bool(KM_TAG_ALL_USERS)); 77 params->push_back(keymaster_param_bool(KM_TAG_NO_AUTH_REQUIRED)); 78 params->push_back(keymaster_param_date(KM_TAG_ORIGINATION_EXPIRE_DATETIME, LLONG_MAX)); 79 params->push_back(keymaster_param_date(KM_TAG_USAGE_EXPIRE_DATETIME, LLONG_MAX)); 80 params->push_back(keymaster_param_date(KM_TAG_ACTIVE_DATETIME, 0)); 81 } 82 83 uid_t get_app_id(uid_t uid) { 84 return uid % AID_USER; 85 } 86 87 uid_t get_user_id(uid_t uid) { 88 return uid / AID_USER; 89 } 90
