mirror of https://github.com/kubernetes/kops.git
129 lines
3.6 KiB
Go
129 lines
3.6 KiB
Go
/*
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Copyright 2023 The Kubernetes 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 bootstrap
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import (
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"context"
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"crypto/subtle"
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"crypto/tls"
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"crypto/x509"
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"fmt"
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"time"
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"google.golang.org/grpc"
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"google.golang.org/grpc/credentials"
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"k8s.io/kops/pkg/apis/nodeup"
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"k8s.io/kops/pkg/pki"
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pb "k8s.io/kops/proto/kops/bootstrap/v1"
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"k8s.io/kops/upup/pkg/fi"
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)
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type ChallengeClient struct {
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keystore pki.Keystore
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}
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func NewChallengeClient(keystore pki.Keystore) (*ChallengeClient, error) {
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return &ChallengeClient{
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keystore: keystore,
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}, nil
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}
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func (c *ChallengeClient) getClientCertificate(ctx context.Context, clusterName string) (*tls.Certificate, error) {
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subject := challengeKopsControllerSubject(clusterName)
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certificate, privateKey, _, err := pki.IssueCert(ctx, &pki.IssueCertRequest{
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Validity: 1 * time.Hour,
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Signer: fi.CertificateIDCA,
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Type: "client",
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Subject: subject,
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}, c.keystore)
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if err != nil {
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return nil, fmt.Errorf("error creating certificate: %w", err)
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}
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// TODO: Caching and rotation
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clientCertificate := &tls.Certificate{
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PrivateKey: privateKey.Key,
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Certificate: [][]byte{certificate.Certificate.Raw},
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Leaf: certificate.Certificate,
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}
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return clientCertificate, nil
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}
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func (c *ChallengeClient) DoCallbackChallenge(ctx context.Context, clusterName string, targetEndpoint string, bootstrapRequest *nodeup.BootstrapRequest) error {
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challenge := bootstrapRequest.Challenge
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if challenge == nil {
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return fmt.Errorf("challenge not set")
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}
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if challenge.ChallengeID == "" {
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return fmt.Errorf("challenge.id not set")
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}
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if len(challenge.ChallengeSecret) == 0 {
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return fmt.Errorf("challenge.secret not set")
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}
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if challenge.Endpoint == "" {
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return fmt.Errorf("challenge.endpoint not set")
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}
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if len(challenge.ServerCA) == 0 {
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return fmt.Errorf("challenge.ca not set")
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}
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clientCertificate, err := c.getClientCertificate(ctx, clusterName)
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if err != nil {
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return err
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}
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serverCAs := x509.NewCertPool()
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if !serverCAs.AppendCertsFromPEM(challenge.ServerCA) {
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return fmt.Errorf("error loading certificate pool")
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}
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serverName := challengeServerHostName(clusterName)
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tlsConfig := &tls.Config{
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RootCAs: serverCAs,
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Certificates: []tls.Certificate{*clientCertificate},
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ServerName: serverName,
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}
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kospControllerNonce := randomBytes(16)
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req := &pb.ChallengeRequest{
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ChallengeId: challenge.ChallengeID,
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ChallengeRandom: kospControllerNonce,
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}
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expectedChallengeResponse := buildChallengeResponse(challenge.ChallengeSecret, kospControllerNonce)
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var opts []grpc.DialOption
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opts = append(opts, grpc.WithTransportCredentials(credentials.NewTLS(tlsConfig)))
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conn, err := grpc.DialContext(ctx, targetEndpoint, opts...)
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if err != nil {
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return fmt.Errorf("error dialing target %q: %w", targetEndpoint, err)
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}
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client := pb.NewCallbackServiceClient(conn)
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response, err := client.Challenge(ctx, req)
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if err != nil {
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return fmt.Errorf("error from callback challenge: %w", err)
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}
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if subtle.ConstantTimeCompare(response.GetChallengeResponse(), expectedChallengeResponse) != 1 {
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return fmt.Errorf("callback challenge returned wrong result")
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}
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return nil
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}
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