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cmd/k8s-operator: use oauth credentials for API access.

Browse Source 
This automates both the operator's initial login, and
provisioning/deprovisioning of proxies.

Signed-off-by: David Anderson <danderson@tailscale.com>
pull/6488/head
David Anderson 2 years ago committed by Dave Anderson
parent a7ab3429b6
commit 3a5fc233aa
3 changed files with 91 additions and 23 deletions
Show Stats Download Patch File Download Diff File

20
cmd/k8s-operator/manifests/operator.yaml
Unescape Escape View File

@ -79,6 +79,14 @@ roleRef:
name: operator
apiGroup: rbac.authorization.k8s.io
---
apiVersion: v1
kind: Secret
metadata:
name: tailscale-operator-oauth
stringData:
client_id: # SET CLIENT ID HERE
client_secret: # SET CLIENT SECRET HERE
---
apiVersion: apps/v1
kind: Deployment
metadata:
@ -96,6 +104,10 @@ spec:
app: tailscale-operator
spec:
serviceAccountName: operator
volumes:
- name: oauth
secret:
secretName: tailscale-operator-oauth
containers:
- name: tailscale-operator
image: tailscale/k8s-operator:latest
@ -108,7 +120,15 @@ spec:
value: tailscale-operator
- name: OPERATOR_SECRET
value: tailscale-operator
- name: CLIENT_ID_FILE
value: /oauth/client_id
- name: CLIENT_SECRET_FILE
value: /oauth/client_secret
- name: PROXY_IMAGE
value: tailscale/tailscale:latest
- name: PROXY_TAGS
value: tag:k8s
volumeMounts:
- name: oauth
mountPath: /oauth
readOnly: true

80
cmd/k8s-operator/operator.go
Unescape Escape View File

@ -18,6 +18,7 @@ import (
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"golang.org/x/exp/slices"
"golang.org/x/oauth2/clientcredentials"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
@ -38,22 +39,29 @@ import (
"sigs.k8s.io/controller-runtime/pkg/source"
"sigs.k8s.io/yaml"
"tailscale.com/client/tailscale"
"tailscale.com/ipn"
"tailscale.com/ipn/store/kubestore"
"tailscale.com/tsnet"
"tailscale.com/types/logger"
)
func main() {
// Required to use our client API. We're fine with the instability since the
// client lives in the same repo as this code.
tailscale.I_Acknowledge_This_API_Is_Unstable = true
var (
hostname = defaultEnv("OPERATOR_HOSTNAME", "tailscale-operator")
kubeSecret = defaultEnv("OPERATOR_SECRET", "")
operatorTags = defaultEnv("OPERATOR_INITIAL_TAGS", "tag:k8s-operator")
tsNamespace = defaultEnv("OPERATOR_NAMESPACE", "default")
tslogging = defaultEnv("OPERATOR_LOGGING", "info")
clientIDPath = defaultEnv("CLIENT_ID_FILE", "")
clientSecretPath = defaultEnv("CLIENT_SECRET_FILE", "")
image = defaultEnv("PROXY_IMAGE", "tailscale/tailscale:latest")
tags = defaultEnv("PROXY_TAGS", "tag:k8s")
)
tailscale.I_Acknowledge_This_API_Is_Unstable = true
var opts []kzap.Opts
switch tslogging {
case "info":
@ -66,6 +74,25 @@ func main() {
zlog := kzap.NewRaw(opts...).Sugar()
logf.SetLogger(zapr.NewLogger(zlog.Desugar()))
startlog := zlog.Named("startup")
if clientIDPath == "" || clientSecretPath == "" {
startlog.Fatalf("CLIENT_ID_FILE and CLIENT_SECRET_FILE must be set")
}
clientID, err := os.ReadFile(clientIDPath)
if err != nil {
startlog.Fatalf("reading client ID %q: %v", clientIDPath, err)
}
clientSecret, err := os.ReadFile(clientSecretPath)
if err != nil {
startlog.Fatalf("reading client secret %q: %v", clientSecretPath, err)
}
credentials := clientcredentials.Config{
ClientID: string(clientID),
ClientSecret: string(clientSecret),
TokenURL: "https://login.tailscale.com/api/v2/oauth/token",
}
tsClient := tailscale.NewClient("-", nil)
tsClient.HTTPClient = credentials.Client(context.Background())
s := &tsnet.Server{
Hostname: hostname,
Logf: zlog.Named("tailscaled").Debugf,
@ -87,10 +114,11 @@ func main() {
}
ctx := context.Background()
loginShown := false
loginDone := false
machineAuthShown := false
waitOnline:
for {
startlog.Debugf("querying tailscaled status")
st, err := lc.StatusWithoutPeers(ctx)
if err != nil {
startlog.Fatalf("getting status: %v", err)
@ -99,10 +127,32 @@ waitOnline:
case "Running":
break waitOnline
case "NeedsLogin":
if !loginShown && st.AuthURL != "" {
startlog.Infof("tailscale needs login, please visit: %s", st.AuthURL)
loginShown = true
if loginDone {
break
}
caps := tailscale.KeyCapabilities{
Devices: tailscale.KeyDeviceCapabilities{
Create: tailscale.KeyDeviceCreateCapabilities{
Reusable: false,
Preauthorized: true,
Tags: strings.Split(operatorTags, ","),
},
},
}
authkey, _, err := tsClient.CreateKey(ctx, caps)
if err != nil {
startlog.Fatalf("creating operator authkey: %v", err)
}
if err := lc.Start(ctx, ipn.Options{
AuthKey: authkey,
}); err != nil {
startlog.Fatalf("starting tailscale: %v", err)
}
if err := lc.StartLoginInteractive(ctx); err != nil {
startlog.Fatalf("starting login: %v", err)
}
startlog.Debugf("requested login by authkey")
loginDone = true
case "NeedsMachineAuth":
if !machineAuthShown {
startlog.Infof("Machine authorization required, please visit the admin panel to authorize")
@ -114,6 +164,14 @@ waitOnline:
time.Sleep(time.Second)
}
sr := &ServiceReconciler{
tsClient: tsClient,
defaultTags: strings.Split(tags, ","),
operatorNamespace: tsNamespace,
proxyImage: image,
logger: zlog.Named("service-reconciler"),
}
// For secrets and statefulsets, we only get permission to touch the objects
// in the controller's own namespace. This cannot be expressed by
// .Watches(...) below, instead you have to add a per-type field selector to
@ -134,17 +192,7 @@ waitOnline:
if err != nil {
startlog.Fatalf("could not create manager: %v", err)
}
tsClient, err := s.APIClient()
if err != nil {
startlog.Fatalf("getting tailscale client: %v", err)
}
sr := &ServiceReconciler{
tsClient: tsClient,
defaultTags: strings.Split(tags, ","),
operatorNamespace: tsNamespace,
proxyImage: image,
logger: zlog.Named("service-reconciler"),
}
reconcileFilter := handler.EnqueueRequestsFromMapFunc(func(o client.Object) []reconcile.Request {
ls := o.GetLabels()
if ls[LabelManaged] != "true" {

2
go.mod
Unescape Escape View File

@ -71,6 +71,7 @@ require (
golang.org/x/crypto v0.3.0
golang.org/x/exp v0.0.0-20221205204356-47842c84f3db
golang.org/x/net v0.2.0
golang.org/x/oauth2 v0.0.0-20220411215720-9780585627b5
golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4
golang.org/x/sys v0.2.0
golang.org/x/term v0.2.0
@ -301,7 +302,6 @@ require (
golang.org/x/exp/typeparams v0.0.0-20220328175248-053ad81199eb // indirect
golang.org/x/image v0.0.0-20201208152932-35266b937fa6 // indirect
golang.org/x/mod v0.6.0 // indirect
golang.org/x/oauth2 v0.0.0-20220411215720-9780585627b5 // indirect
golang.org/x/text v0.4.0 // indirect
gomodules.xyz/jsonpatch/v2 v2.2.0 // indirect
google.golang.org/appengine v1.6.7 // indirect

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