mirror of https://github.com/k3s-io/k3s
137 lines
3.8 KiB
Go
137 lines
3.8 KiB
Go
/*
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Copyright The ocicrypt Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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package jwe
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import (
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"crypto/ecdsa"
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"github.com/containers/ocicrypt/config"
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"github.com/containers/ocicrypt/keywrap"
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"github.com/containers/ocicrypt/utils"
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"github.com/pkg/errors"
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jose "gopkg.in/square/go-jose.v2"
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)
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type jweKeyWrapper struct {
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}
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func (kw *jweKeyWrapper) GetAnnotationID() string {
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return "org.opencontainers.image.enc.keys.jwe"
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}
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// NewKeyWrapper returns a new key wrapping interface using jwe
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func NewKeyWrapper() keywrap.KeyWrapper {
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return &jweKeyWrapper{}
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}
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// WrapKeys wraps the session key for recpients and encrypts the optsData, which
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// describe the symmetric key used for encrypting the layer
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func (kw *jweKeyWrapper) WrapKeys(ec *config.EncryptConfig, optsData []byte) ([]byte, error) {
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var joseRecipients []jose.Recipient
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err := addPubKeys(&joseRecipients, ec.Parameters["pubkeys"])
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if err != nil {
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return nil, err
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}
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// no recipients is not an error...
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if len(joseRecipients) == 0 {
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return nil, nil
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}
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encrypter, err := jose.NewMultiEncrypter(jose.A256GCM, joseRecipients, nil)
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if err != nil {
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return nil, errors.Wrapf(err, "jose.NewMultiEncrypter failed")
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}
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jwe, err := encrypter.Encrypt(optsData)
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if err != nil {
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return nil, errors.Wrapf(err, "JWE Encrypt failed")
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}
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return []byte(jwe.FullSerialize()), nil
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}
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func (kw *jweKeyWrapper) UnwrapKey(dc *config.DecryptConfig, jweString []byte) ([]byte, error) {
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jwe, err := jose.ParseEncrypted(string(jweString))
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if err != nil {
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return nil, errors.New("jose.ParseEncrypted failed")
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}
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privKeys := kw.GetPrivateKeys(dc.Parameters)
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if len(privKeys) == 0 {
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return nil, errors.New("No private keys found for JWE decryption")
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}
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privKeysPasswords := kw.getPrivateKeysPasswords(dc.Parameters)
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if len(privKeysPasswords) != len(privKeys) {
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return nil, errors.New("Private key password array length must be same as that of private keys")
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}
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for idx, privKey := range privKeys {
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key, err := utils.ParsePrivateKey(privKey, privKeysPasswords[idx], "JWE")
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if err != nil {
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return nil, err
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}
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_, _, plain, err := jwe.DecryptMulti(key)
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if err == nil {
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return plain, nil
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}
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}
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return nil, errors.New("JWE: No suitable private key found for decryption")
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}
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func (kw *jweKeyWrapper) NoPossibleKeys(dcparameters map[string][][]byte) bool {
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return len(kw.GetPrivateKeys(dcparameters)) == 0
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}
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func (kw *jweKeyWrapper) GetPrivateKeys(dcparameters map[string][][]byte) [][]byte {
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return dcparameters["privkeys"]
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}
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func (kw *jweKeyWrapper) getPrivateKeysPasswords(dcparameters map[string][][]byte) [][]byte {
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return dcparameters["privkeys-passwords"]
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}
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func (kw *jweKeyWrapper) GetKeyIdsFromPacket(b64jwes string) ([]uint64, error) {
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return nil, nil
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}
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func (kw *jweKeyWrapper) GetRecipients(b64jwes string) ([]string, error) {
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return []string{"[jwe]"}, nil
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}
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func addPubKeys(joseRecipients *[]jose.Recipient, pubKeys [][]byte) error {
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if len(pubKeys) == 0 {
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return nil
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}
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for _, pubKey := range pubKeys {
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key, err := utils.ParsePublicKey(pubKey, "JWE")
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if err != nil {
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return err
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}
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alg := jose.RSA_OAEP
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switch key.(type) {
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case *ecdsa.PublicKey:
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alg = jose.ECDH_ES_A256KW
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}
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*joseRecipients = append(*joseRecipients, jose.Recipient{
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Algorithm: alg,
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Key: key,
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})
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}
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return nil
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}
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