mirror of https://github.com/kubernetes/kops.git
126 lines
3.6 KiB
Go
126 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 do
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import (
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"context"
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"errors"
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"fmt"
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"net"
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"net/http"
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"os"
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"strconv"
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"strings"
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"github.com/digitalocean/godo"
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"golang.org/x/oauth2"
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"k8s.io/kops/pkg/bootstrap"
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"k8s.io/kops/pkg/wellknownports"
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)
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type DigitalOceanVerifierOptions struct {
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}
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type digitalOceanVerifier struct {
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doClient *godo.Client
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}
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var _ bootstrap.Verifier = &digitalOceanVerifier{}
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func NewVerifier(ctx context.Context, opt *DigitalOceanVerifierOptions) (bootstrap.Verifier, error) {
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accessToken := os.Getenv("DIGITALOCEAN_ACCESS_TOKEN")
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if accessToken == "" {
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return nil, errors.New("DIGITALOCEAN_ACCESS_TOKEN is required")
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}
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tokenSource := &TokenSource{
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AccessToken: accessToken,
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}
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oauthClient := oauth2.NewClient(ctx, tokenSource)
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doClient := godo.NewClient(oauthClient)
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return &digitalOceanVerifier{
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doClient: doClient,
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}, nil
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}
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func (o digitalOceanVerifier) VerifyToken(ctx context.Context, rawRequest *http.Request, token string, body []byte) (*bootstrap.VerifyResult, error) {
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if !strings.HasPrefix(token, DOAuthenticationTokenPrefix) {
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return nil, bootstrap.ErrNotThisVerifier
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}
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serverIDString := strings.TrimPrefix(token, DOAuthenticationTokenPrefix)
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serverID, err := strconv.Atoi(serverIDString)
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if err != nil {
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return nil, fmt.Errorf("invalid authorization token")
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}
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droplet, _, err := o.doClient.Droplets.Get(ctx, serverID)
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if err != nil {
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return nil, fmt.Errorf("failed to get info for server %v: %w", token, err)
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}
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var addresses []string
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var challengeEndpoints []string
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if droplet.Networks != nil {
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for _, nic := range droplet.Networks.V4 {
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if nic.Type == "private" {
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addresses = append(addresses, nic.IPAddress)
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challengeEndpoints = append(challengeEndpoints, net.JoinHostPort(nic.IPAddress, strconv.Itoa(wellknownports.NodeupChallenge)))
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}
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}
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for _, nic := range droplet.Networks.V6 {
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if nic.Type == "private" {
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addresses = append(addresses, nic.IPAddress)
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challengeEndpoints = append(challengeEndpoints, net.JoinHostPort(nic.IPAddress, strconv.Itoa(wellknownports.NodeupChallenge)))
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}
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}
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}
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// Note: we use TLS passthrough, so we lose the client IP address.
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// We therefore don't have a great way to verify the request.
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// We do at least prevent duplicate node registrations, preventing some attacks here.
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// The node challenge is important here though, verifying the caller has control of the IP address.
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nodeName := ""
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if len(addresses) == 0 {
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// Name seems a better default than the first IP, but we have to match what other components are expecting
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nodeName = droplet.Name
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} else {
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nodeName = addresses[0]
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}
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if len(challengeEndpoints) == 0 {
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return nil, fmt.Errorf("cannot determine challenge endpoint for server %q", serverID)
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}
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result := &bootstrap.VerifyResult{
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NodeName: nodeName,
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CertificateNames: addresses,
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ChallengeEndpoint: challengeEndpoints[0],
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}
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for _, tag := range droplet.Tags {
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if strings.HasPrefix(tag, TagKubernetesInstanceGroup+":") {
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result.InstanceGroupName = strings.TrimPrefix(tag, TagKubernetesInstanceGroup+":")
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}
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}
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return result, nil
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}
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