/
lxd_oidc.go
237 lines (187 loc) · 5.63 KB
/
lxd_oidc.go
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package lxd
import (
"context"
"crypto/rand"
"fmt"
"io"
"net/http"
"net/url"
"os"
"os/signal"
"strings"
"syscall"
"time"
"github.com/go-macaroon-bakery/macaroon-bakery/v3/httpbakery"
"github.com/zitadel/oidc/v2/pkg/client/rp"
httphelper "github.com/zitadel/oidc/v2/pkg/http"
"github.com/zitadel/oidc/v2/pkg/oidc"
"golang.org/x/oauth2"
)
func (r *ProtocolLXD) setupOIDCClient(token *oidc.Tokens[*oidc.IDTokenClaims]) {
if r.oidcClient != nil {
return
}
r.oidcClient = newOIDCClient(token)
r.oidcClient.httpClient = r.http
}
// Custom transport that modifies requests to inject the audience field.
type oidcTransport struct {
deviceAuthorizationEndpoint string
audience string
}
func (o *oidcTransport) RoundTrip(r *http.Request) (*http.Response, error) {
// Don't modify the request if it's not to the device authorization endpoint, or there are no
// URL parameters which need to be set.
if r.URL.String() != o.deviceAuthorizationEndpoint || len(o.audience) == 0 {
return http.DefaultTransport.RoundTrip(r)
}
err := r.ParseForm()
if err != nil {
return nil, err
}
if o.audience != "" {
r.Form.Add("audience", o.audience)
}
// Update the body with the new URL parameters.
body := r.Form.Encode()
r.Body = io.NopCloser(strings.NewReader(body))
r.ContentLength = int64(len(body))
return http.DefaultTransport.RoundTrip(r)
}
var errRefreshAccessToken = fmt.Errorf("Failed refreshing access token")
var oidcScopes = []string{oidc.ScopeOpenID, oidc.ScopeOfflineAccess, oidc.ScopeEmail}
type oidcClient struct {
httpClient *http.Client
oidcTransport *oidcTransport
tokens *oidc.Tokens[*oidc.IDTokenClaims]
}
func newOIDCClient(tokens *oidc.Tokens[*oidc.IDTokenClaims]) *oidcClient {
client := oidcClient{
tokens: tokens,
httpClient: &http.Client{},
oidcTransport: &oidcTransport{},
}
// Ensure client.tokens is never nil otherwise authenticate() will panic.
if client.tokens == nil {
client.tokens = &oidc.Tokens[*oidc.IDTokenClaims]{}
}
return &client
}
func (o *oidcClient) getAccessToken() string {
if o.tokens == nil || o.tokens.Token == nil {
return ""
}
return o.tokens.AccessToken
}
func (o *oidcClient) do(req *http.Request) (*http.Response, error) {
resp, err := o.httpClient.Do(req)
if err != nil {
return nil, err
}
// Return immediately if the error is not HTTP status unauthorized.
if resp.StatusCode != http.StatusUnauthorized {
return resp, nil
}
issuer := resp.Header.Get("X-LXD-OIDC-issuer")
clientID := resp.Header.Get("X-LXD-OIDC-clientid")
audience := resp.Header.Get("X-LXD-OIDC-audience")
err = o.refresh(issuer, clientID)
if err != nil {
err = o.authenticate(issuer, clientID, audience)
if err != nil {
return nil, err
}
}
// Set the new access token in the header.
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", o.tokens.AccessToken))
resp, err = o.httpClient.Do(req)
if err != nil {
return nil, err
}
return resp, nil
}
func (o *oidcClient) getProvider(issuer string, clientID string) (rp.RelyingParty, error) {
hashKey := make([]byte, 16)
encryptKey := make([]byte, 16)
_, err := rand.Read(hashKey)
if err != nil {
return nil, err
}
_, err = rand.Read(encryptKey)
if err != nil {
return nil, err
}
cookieHandler := httphelper.NewCookieHandler(hashKey, encryptKey, httphelper.WithUnsecure())
options := []rp.Option{
rp.WithCookieHandler(cookieHandler),
rp.WithVerifierOpts(rp.WithIssuedAtOffset(5 * time.Second)),
rp.WithPKCE(cookieHandler),
rp.WithHTTPClient(o.httpClient),
}
provider, err := rp.NewRelyingPartyOIDC(issuer, clientID, "", "", oidcScopes, options...)
if err != nil {
return nil, err
}
return provider, nil
}
func (o *oidcClient) refresh(issuer string, clientID string) error {
if o.tokens.Token == nil || o.tokens.RefreshToken == "" {
return errRefreshAccessToken
}
provider, err := o.getProvider(issuer, clientID)
if err != nil {
return errRefreshAccessToken
}
oauthTokens, err := rp.RefreshAccessToken(provider, o.tokens.RefreshToken, "", "")
if err != nil {
return errRefreshAccessToken
}
o.tokens.Token.AccessToken = oauthTokens.AccessToken
o.tokens.TokenType = oauthTokens.TokenType
o.tokens.Expiry = oauthTokens.Expiry
if oauthTokens.RefreshToken != "" {
o.tokens.Token.RefreshToken = oauthTokens.RefreshToken
}
return nil
}
func (o *oidcClient) authenticate(issuer string, clientID string, audience string) error {
// Store the old transport and restore it in the end.
oldTransport := o.httpClient.Transport
o.oidcTransport.audience = audience
o.httpClient.Transport = o.oidcTransport
defer func() {
o.httpClient.Transport = oldTransport
}()
provider, err := o.getProvider(issuer, clientID)
if err != nil {
return err
}
o.oidcTransport.deviceAuthorizationEndpoint = provider.GetDeviceAuthorizationEndpoint()
resp, err := rp.DeviceAuthorization(oidcScopes, provider)
if err != nil {
return err
}
fmt.Printf("Code: %s\n\n", resp.UserCode)
u, _ := url.Parse(resp.VerificationURIComplete)
err = httpbakery.OpenWebBrowser(u)
if err != nil {
return err
}
ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGINT)
defer stop()
token, err := rp.DeviceAccessToken(ctx, resp.DeviceCode, time.Duration(resp.Interval)*time.Second, provider)
if err != nil {
return err
}
if o.tokens.Token == nil {
o.tokens.Token = &oauth2.Token{}
}
o.tokens.Expiry = time.Now().Add(time.Duration(token.ExpiresIn))
o.tokens.IDToken = token.IDToken
o.tokens.Token.AccessToken = token.AccessToken
o.tokens.TokenType = token.TokenType
if token.RefreshToken != "" {
o.tokens.Token.RefreshToken = token.RefreshToken
}
return nil
}