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108 lines
2.7 KiB
Protocol Buffer
108 lines
2.7 KiB
Protocol Buffer
/*
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* metadata.proto - File which contains all of the metadata structures which we
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* write to metadata files. Must be compiled with protoc to use the library.
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* Compilation can be invoked with go generate.
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*
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* Copyright 2017 Google Inc.
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* Author: Joe Richey (joerichey@google.com)
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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// If you modify this file, be sure to run "go generate" on this package.
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syntax = "proto3";
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package metadata;
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// Cost parameters to be used in our hashing functions.
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message HashingCosts {
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int64 time = 2;
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int64 memory = 3;
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int64 parallelism = 4;
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}
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// This structure is used for our authenticated wrapping/unwrapping of keys.
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message WrappedKeyData {
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bytes IV = 1;
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bytes encrypted_key = 2;
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bytes hmac = 3;
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}
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// Specifies the method in which an outside secret is obtained for a Protector
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enum SourceType {
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default = 0;
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pam_passphrase = 1;
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custom_passphrase = 2;
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raw_key = 3;
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}
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// The associated data for each protector
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message ProtectorData {
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string protector_descriptor = 1;
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SourceType source = 2;
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// These are only used by some of the protector types
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string name = 3;
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HashingCosts costs = 4;
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bytes salt = 5;
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int64 uid = 6;
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WrappedKeyData wrapped_key = 7;
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}
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// Encryption policy specifics, corresponds to the fscrypt_policy struct
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message EncryptionOptions {
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int64 padding = 1;
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// Type of encryption; should match declarations of unix.FSCRYPT_MODE
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enum Mode {
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default = 0;
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AES_256_XTS = 1;
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AES_256_GCM = 2;
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AES_256_CBC = 3;
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AES_256_CTS = 4;
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AES_128_CBC = 5;
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AES_128_CTS = 6;
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Adiantum = 9;
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}
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Mode contents = 2;
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Mode filenames = 3;
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int64 policy_version = 4;
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}
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message WrappedPolicyKey {
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string protector_descriptor = 1;
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WrappedKeyData wrapped_key = 2;
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}
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// The associated data for each policy
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message PolicyData {
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string key_descriptor = 1;
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EncryptionOptions options = 2;
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repeated WrappedPolicyKey wrapped_policy_keys = 3;
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}
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// Data stored in the config file
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message Config {
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SourceType source = 1;
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HashingCosts hash_costs = 2;
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EncryptionOptions options = 4;
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bool use_fs_keyring_for_v1_policies = 5;
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bool allow_cross_user_metadata = 6;
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// reserve the removed field 'string compatibility = 3;'
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reserved 3;
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reserved "compatibility";
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}
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