diff options
Diffstat (limited to 'config/config.go')
-rw-r--r-- | config/config.go | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/config/config.go b/config/config.go new file mode 100644 index 0000000..d960766 --- /dev/null +++ b/config/config.go @@ -0,0 +1,114 @@ +/* + Copyright The ocicrypt Authors. + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +*/ + +package config + +// EncryptConfig is the container image PGP encryption configuration holding +// the identifiers of those that will be able to decrypt the container and +// the PGP public keyring file data that contains their public keys. +type EncryptConfig struct { + // map holding 'gpg-recipients', 'gpg-pubkeyringfile', 'pubkeys', 'x509s' + Parameters map[string][][]byte + + DecryptConfig DecryptConfig +} + +// DecryptConfig wraps the Parameters map that holds the decryption key +type DecryptConfig struct { + // map holding 'privkeys', 'x509s', 'gpg-privatekeys' + Parameters map[string][][]byte +} + +// CryptoConfig is a common wrapper for EncryptConfig and DecrypConfig that can +// be passed through functions that share much code for encryption and decryption +type CryptoConfig struct { + EncryptConfig *EncryptConfig + DecryptConfig *DecryptConfig +} + +// InitDecryption initialized a CryptoConfig object with parameters used for decryption +func InitDecryption(dcparameters map[string][][]byte) CryptoConfig { + return CryptoConfig{ + DecryptConfig: &DecryptConfig{ + Parameters: dcparameters, + }, + } +} + +// InitEncryption initializes a CryptoConfig object with parameters used for encryption +// It also takes dcparameters that may be needed for decryption when adding a recipient +// to an already encrypted image +func InitEncryption(parameters, dcparameters map[string][][]byte) CryptoConfig { + return CryptoConfig{ + EncryptConfig: &EncryptConfig{ + Parameters: parameters, + DecryptConfig: DecryptConfig{ + Parameters: dcparameters, + }, + }, + } +} + +// CombineCryptoConfigs takes a CryptoConfig list and creates a single CryptoConfig +// containing the crypto configuration of all the key bundles +func CombineCryptoConfigs(ccs []CryptoConfig) CryptoConfig { + ecparam := map[string][][]byte{} + ecdcparam := map[string][][]byte{} + dcparam := map[string][][]byte{} + + for _, cc := range ccs { + if ec := cc.EncryptConfig; ec != nil { + addToMap(ecparam, ec.Parameters) + addToMap(ecdcparam, ec.DecryptConfig.Parameters) + } + + if dc := cc.DecryptConfig; dc != nil { + addToMap(dcparam, dc.Parameters) + } + } + + return CryptoConfig{ + EncryptConfig: &EncryptConfig{ + Parameters: ecparam, + DecryptConfig: DecryptConfig{ + Parameters: ecdcparam, + }, + }, + DecryptConfig: &DecryptConfig{ + Parameters: dcparam, + }, + } + +} + +// AttachDecryptConfig adds DecryptConfig to the field of EncryptConfig so that +// the decryption parameters can be used to add recipients to an existing image +// if the user is able to decrypt it. +func (ec *EncryptConfig) AttachDecryptConfig(dc *DecryptConfig) { + if dc != nil { + addToMap(ec.DecryptConfig.Parameters, dc.Parameters) + } +} + +func addToMap(orig map[string][][]byte, add map[string][][]byte) { + for k, v := range add { + if ov, ok := orig[k]; ok { + orig[k] = append(ov, v...) + } else { + orig[k] = v + } + } +} |