mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-29 08:20:20 +00:00
da76d8ddae
Signed-off-by: Marcel Lauhoff <marcel.lauhoff@suse.com>
535 lines
14 KiB
Go
535 lines
14 KiB
Go
/*
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Copyright 2022 The Ceph-CSI 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 kms
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import (
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"bufio"
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"bytes"
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"context"
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"crypto/tls"
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"crypto/x509"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"time"
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"github.com/ceph/ceph-csi/internal/util/k8s"
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kmip "github.com/gemalto/kmip-go"
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"github.com/gemalto/kmip-go/kmip14"
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"github.com/gemalto/kmip-go/ttlv"
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"github.com/google/uuid"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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)
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const (
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kmsTypeKMIP = "kmip"
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// kmipDefaulfReadTimeout is the default read network timeout.
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kmipDefaulfReadTimeout = 10
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// kmipDefaultWriteTimeout is the default write network timeout.
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kmipDefaultWriteTimeout = 10
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// KMIP version.
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protocolMajor = 1
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protocolMinor = 4
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// nonceSize is required to generate nonce for encrypting DEK.
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nonceSize = 16
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// kmipDefaultSecretsName is the default name of the Kubernetes Secret
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// that contains the credentials to access the KMIP server. The name of
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// the Secret can be configured by setting the `KMIP_SECRET_NAME`
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// option.
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//
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// #nosec:G101, value not credential, just references token.
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kmipDefaultSecretsName = "ceph-csi-kmip-credentials"
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kmipEndpoint = "KMIP_ENDPOINT"
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kmipTLSServerName = "TLS_SERVER_NAME"
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kmipReadTimeOut = "READ_TIMEOUT"
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kmipWriteTimeOut = "WRITE_TIMEOUT"
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// The following options are part of the Kubernetes Secrets.
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//
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// #nosec:G101, value not credential, just configuration keys.
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kmipSecretNameKey = "KMIP_SECRET_NAME"
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kmipCACert = "CA_CERT"
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kmipCLientCert = "CLIENT_CERT"
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kmipClientKey = "CLIENT_KEY"
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kmipUniqueIdentifier = "UNIQUE_IDENTIFIER"
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)
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var _ = RegisterProvider(Provider{
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UniqueID: kmsTypeKMIP,
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Initializer: initKMIPKMS,
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})
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type kmipKMS struct {
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// basic options to get the secret
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secretName string
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namespace string
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// standard KMIP configuration options
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endpoint string
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tlsConfig *tls.Config
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uniqueIdentifier string
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readTimeout uint8
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writeTimeout uint8
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}
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func initKMIPKMS(args ProviderInitArgs) (EncryptionKMS, error) {
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kms := &kmipKMS{
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namespace: args.Namespace,
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}
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// get secret name if set, else use default.
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err := setConfigString(&kms.secretName, args.Config, kmipSecretNameKey)
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if errors.Is(err, errConfigOptionInvalid) {
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return nil, err
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} else if errors.Is(err, errConfigOptionMissing) {
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kms.secretName = kmipDefaultSecretsName
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}
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err = setConfigString(&kms.endpoint, args.Config, kmipEndpoint)
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if err != nil {
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return nil, err
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}
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// optional
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serverName := ""
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err = setConfigString(&serverName, args.Config, kmipTLSServerName)
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if errors.Is(err, errConfigOptionInvalid) {
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return nil, err
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}
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// optional
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timeout := kmipDefaulfReadTimeout
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err = setConfigInt(&timeout, args.Config, kmipReadTimeOut)
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if errors.Is(err, errConfigOptionInvalid) {
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return nil, err
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}
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kms.readTimeout = uint8(timeout)
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// optional
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timeout = kmipDefaultWriteTimeout
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err = setConfigInt(&timeout, args.Config, kmipWriteTimeOut)
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if errors.Is(err, errConfigOptionInvalid) {
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return nil, err
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}
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kms.writeTimeout = uint8(timeout)
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// read the Kubernetes Secret with CA cert, client cert, client key
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// & key unique identifier.
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secrets, err := kms.getSecrets()
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if err != nil {
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return nil, fmt.Errorf("failed to get secrets: %w", err)
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}
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caCert, found := secrets[kmipCACert]
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if !found {
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return nil, fmt.Errorf("%w: %s", errConfigOptionMissing, kmipCACert)
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}
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clientCert, found := secrets[kmipCLientCert]
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if !found {
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return nil, fmt.Errorf("%w: %s", errConfigOptionMissing, kmipCLientCert)
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}
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clientKey, found := secrets[kmipClientKey]
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if !found {
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return nil, fmt.Errorf("%w: %s", errConfigOptionMissing, kmipCLientCert)
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}
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kms.uniqueIdentifier, found = secrets[kmipUniqueIdentifier]
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if !found {
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return nil, fmt.Errorf("%w: %s", errConfigOptionMissing, kmipUniqueIdentifier)
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}
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caCertPool := x509.NewCertPool()
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caCertPool.AppendCertsFromPEM([]byte(caCert))
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cert, err := tls.X509KeyPair([]byte(clientCert), []byte(clientKey))
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if err != nil {
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return nil, fmt.Errorf("invalid X509 key pair: %w", err)
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}
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kms.tlsConfig = &tls.Config{
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MinVersion: tls.VersionTLS12,
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ServerName: serverName,
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RootCAs: caCertPool,
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Certificates: []tls.Certificate{cert},
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}
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return kms, nil
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}
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// EncryptDEK uses the KMIP encrypt operation to encrypt the DEK.
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func (kms *kmipKMS) EncryptDEK(_, plainDEK string) (string, error) {
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conn, err := kms.connect()
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if err != nil {
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return "", err
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}
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defer conn.Close()
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emd := encryptedMetedataDEK{}
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emd.Nonce, err = generateNonce(nonceSize)
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if err != nil {
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return "", fmt.Errorf("failed to generated nonce: %w", err)
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}
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respMsg, decoder, uniqueBatchItemID, err := kms.send(conn,
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kmip14.OperationEncrypt,
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EncryptRequestPayload{
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UniqueIdentifier: kms.uniqueIdentifier,
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Data: []byte(plainDEK),
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CryptographicParameters: kmip.CryptographicParameters{
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PaddingMethod: kmip14.PaddingMethodPKCS5,
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CryptographicAlgorithm: kmip14.CryptographicAlgorithmAES,
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BlockCipherMode: kmip14.BlockCipherModeCBC,
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},
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IVCounterNonce: emd.Nonce,
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})
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if err != nil {
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return "", err
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}
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batchItem, err := kms.verifyResponse(respMsg, kmip14.OperationEncrypt, uniqueBatchItemID)
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if err != nil {
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return "", err
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}
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ttlvPayload, ok := batchItem.ResponsePayload.(ttlv.TTLV)
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if !ok {
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return "", errors.New("failed to parse responsePayload")
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}
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var encryptRespPayload EncryptResponsePayload
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err = decoder.DecodeValue(&encryptRespPayload, ttlvPayload)
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if err != nil {
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return "", err
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}
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emd.DEK = encryptRespPayload.Data
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emdData, err := json.Marshal(&emd)
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if err != nil {
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return "", fmt.Errorf("failed to convert "+
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"encryptedMetedataDEK to JSON: %w", err)
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}
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return string(emdData), nil
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}
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// DecryptDEK uses the KMIP decrypt operation to decrypt the DEK.
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func (kms *kmipKMS) DecryptDEK(_, encryptedDEK string) (string, error) {
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conn, err := kms.connect()
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if err != nil {
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return "", err
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}
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defer conn.Close()
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emd := encryptedMetedataDEK{}
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err = json.Unmarshal([]byte(encryptedDEK), &emd)
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if err != nil {
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return "", fmt.Errorf("failed to convert data to "+
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"encryptedMetedataDEK: %w", err)
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}
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respMsg, decoder, uniqueBatchItemID, err := kms.send(conn,
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kmip14.OperationDecrypt,
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DecryptRequestPayload{
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UniqueIdentifier: kms.uniqueIdentifier,
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Data: emd.DEK,
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IVCounterNonce: emd.Nonce,
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CryptographicParameters: kmip.CryptographicParameters{
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PaddingMethod: kmip14.PaddingMethodPKCS5,
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CryptographicAlgorithm: kmip14.CryptographicAlgorithmAES,
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BlockCipherMode: kmip14.BlockCipherModeCBC,
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},
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})
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if err != nil {
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return "", err
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}
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batchItem, err := kms.verifyResponse(respMsg, kmip14.OperationDecrypt, uniqueBatchItemID)
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if err != nil {
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return "", err
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}
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ttlvPayload, ok := batchItem.ResponsePayload.(ttlv.TTLV)
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if !ok {
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return "", errors.New("failed to parse responsePayload")
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}
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var decryptRespPayload DecryptRequestPayload
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err = decoder.DecodeValue(&decryptRespPayload, ttlvPayload)
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if err != nil {
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return "", err
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}
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return string(decryptRespPayload.Data), nil
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}
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func (kms *kmipKMS) Destroy() {
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// Nothing to do.
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}
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func (kms *kmipKMS) RequiresDEKStore() DEKStoreType {
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return DEKStoreMetadata
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}
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// getSecrets returns required options from the Kubernetes Secret.
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func (kms *kmipKMS) getSecrets() (map[string]string, error) {
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c, err := k8s.NewK8sClient()
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if err != nil {
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return nil, fmt.Errorf("failed to connect to Kubernetes to "+
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"get Secret %s/%s: %w", kms.namespace, kms.secretName, err)
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}
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secret, err := c.CoreV1().Secrets(kms.namespace).Get(context.TODO(),
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kms.secretName, metav1.GetOptions{})
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if err != nil {
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return nil, fmt.Errorf("failed to get Secret %s/%s: %w",
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kms.namespace, kms.secretName, err)
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}
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config := make(map[string]string)
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for k, v := range secret.Data {
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switch k {
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case kmipClientKey, kmipCLientCert, kmipCACert, kmipUniqueIdentifier:
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config[k] = string(v)
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default:
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return nil, fmt.Errorf("unsupported option for KMS "+
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"provider %q: %s", kmsTypeKMIP, k)
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}
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}
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return config, nil
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}
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// connect to the kmip endpoint, perform TLS and KMIP handshakes.
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func (kms *kmipKMS) connect() (*tls.Conn, error) {
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conn, err := tls.Dial("tcp", kms.endpoint, kms.tlsConfig)
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if err != nil {
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return nil, fmt.Errorf("failed to dial kmip connection endpoint: %w", err)
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}
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if kms.readTimeout != 0 {
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err = conn.SetReadDeadline(time.Now().Add(time.Second * time.Duration(kms.readTimeout)))
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if err != nil {
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return nil, fmt.Errorf("failed to set read deadline: %w", err)
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}
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}
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if kms.writeTimeout != 0 {
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err = conn.SetReadDeadline(time.Now().Add(time.Second * time.Duration(kms.writeTimeout)))
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if err != nil {
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return nil, fmt.Errorf("failed to set write deadline: %w", err)
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}
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}
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defer func() {
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if err != nil {
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conn.Close()
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}
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}()
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err = conn.Handshake()
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if err != nil {
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return nil, fmt.Errorf("failed to perform connection handshake: %w", err)
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}
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err = kms.discover(conn)
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if err != nil {
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return nil, err
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}
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return conn, nil
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}
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// discover performs KMIP discover operation.
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// https://docs.oasis-open.org/kmip/spec/v1.4/kmip-spec-v1.4.html
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// chapter 4.26.
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func (kms *kmipKMS) discover(conn io.ReadWriter) error {
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respMsg, decoder, uniqueBatchItemID, err := kms.send(conn,
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kmip14.OperationDiscoverVersions,
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kmip.DiscoverVersionsRequestPayload{
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ProtocolVersion: []kmip.ProtocolVersion{
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{
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ProtocolVersionMajor: protocolMajor,
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ProtocolVersionMinor: protocolMinor,
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},
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},
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})
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if err != nil {
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return err
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}
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batchItem, err := kms.verifyResponse(
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respMsg,
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kmip14.OperationDiscoverVersions,
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uniqueBatchItemID)
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if err != nil {
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return err
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}
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ttlvPayload, ok := batchItem.ResponsePayload.(ttlv.TTLV)
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if !ok {
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return errors.New("failed to parse responsePayload")
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}
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var respDiscoverVersionsPayload kmip.DiscoverVersionsResponsePayload
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err = decoder.DecodeValue(&respDiscoverVersionsPayload, ttlvPayload)
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if err != nil {
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return err
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}
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if len(respDiscoverVersionsPayload.ProtocolVersion) != 1 {
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return fmt.Errorf("invalid len of discovered protocol versions %v expected 1",
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len(respDiscoverVersionsPayload.ProtocolVersion))
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}
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pv := respDiscoverVersionsPayload.ProtocolVersion[0]
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if pv.ProtocolVersionMajor != protocolMajor || pv.ProtocolVersionMinor != protocolMinor {
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return fmt.Errorf("invalid discovered protocol version %v.%v expected %v.%v",
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pv.ProtocolVersionMajor, pv.ProtocolVersionMinor, protocolMajor, protocolMinor)
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}
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return nil
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}
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// send sends KMIP operation over tls connection, returns
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// kmip response message,
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// ttlv Decoder to decode message into desired format,
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// batchItem ID,
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// and error.
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func (kms *kmipKMS) send(
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conn io.ReadWriter,
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operation kmip14.Operation,
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payload interface{},
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) (*kmip.ResponseMessage, *ttlv.Decoder, []byte, error) {
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biID := uuid.New()
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msg := kmip.RequestMessage{
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RequestHeader: kmip.RequestHeader{
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ProtocolVersion: kmip.ProtocolVersion{
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ProtocolVersionMajor: protocolMajor,
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ProtocolVersionMinor: protocolMinor,
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},
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BatchCount: 1,
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},
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BatchItem: []kmip.RequestBatchItem{
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{
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UniqueBatchItemID: biID[:],
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Operation: operation,
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RequestPayload: payload,
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},
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},
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}
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req, err := ttlv.Marshal(msg)
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if err != nil {
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return nil, nil, nil,
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fmt.Errorf("failed to ttlv marshal message: %w", err)
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}
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_, err = conn.Write(req)
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if err != nil {
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return nil, nil, nil,
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fmt.Errorf("failed to write request onto connection: %w", err)
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}
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decoder := ttlv.NewDecoder(bufio.NewReader(conn))
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resp, err := decoder.NextTTLV()
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if err != nil {
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return nil, nil, nil,
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fmt.Errorf("failed to read ttlv KMIP value: %w", err)
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}
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var respMsg kmip.ResponseMessage
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err = decoder.DecodeValue(&respMsg, resp)
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if err != nil {
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return nil, nil, nil,
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fmt.Errorf("failed to decode response value: %w", err)
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}
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return &respMsg, decoder, biID[:], nil
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}
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// verifyResponse verifies the response success and return the batch item.
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func (kms *kmipKMS) verifyResponse(
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respMsg *kmip.ResponseMessage,
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operation kmip14.Operation,
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uniqueBatchItemID []byte,
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) (*kmip.ResponseBatchItem, error) {
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if respMsg.ResponseHeader.BatchCount != 1 {
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return nil, fmt.Errorf("batch count %q should be \"1\"",
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respMsg.ResponseHeader.BatchCount)
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}
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if len(respMsg.BatchItem) != 1 {
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return nil, fmt.Errorf("batch Intems list len %q should be \"1\"",
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len(respMsg.BatchItem))
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}
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batchItem := respMsg.BatchItem[0]
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if operation != batchItem.Operation {
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return nil, fmt.Errorf("unexpected operation, real %q expected %q",
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batchItem.Operation, operation)
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}
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if !bytes.Equal(uniqueBatchItemID, batchItem.UniqueBatchItemID) {
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return nil, fmt.Errorf("unexpected uniqueBatchItemID, real %q expected %q",
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batchItem.UniqueBatchItemID, uniqueBatchItemID)
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}
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if kmip14.ResultStatusSuccess != batchItem.ResultStatus {
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return nil, fmt.Errorf("unexpected result status %q expected success %q,"+
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"result reason %q, result message %q",
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batchItem.ResultStatus, kmip14.ResultStatusSuccess,
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batchItem.ResultReason, batchItem.ResultMessage)
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}
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return &batchItem, nil
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}
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func (kms *kmipKMS) GetSecret(volumeID string) (string, error) {
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return "", ErrGetSecretUnsupported
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}
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// TODO: use the following structs from https://github.com/gemalto/kmip-go
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// when https://github.com/ThalesGroup/kmip-go/issues/21 is resolved.
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// refer: https://docs.oasis-open.org/kmip/spec/v1.4/kmip-spec-v1.4.html.
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type EncryptRequestPayload struct {
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UniqueIdentifier string
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CryptographicParameters kmip.CryptographicParameters
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Data []byte
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IVCounterNonce []byte
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}
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type EncryptResponsePayload struct {
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UniqueIdentifier string
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Data []byte
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IVCounterNonce []byte
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}
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type DecryptRequestPayload struct {
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UniqueIdentifier string
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CryptographicParameters kmip.CryptographicParameters
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Data []byte
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IVCounterNonce []byte
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}
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type DecryptResponsePayload struct {
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UniqueIdentifier string
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Data []byte
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IVCounterNonce []byte
|
|
}
|