forked from argoproj/argo-workflows
/
sso.go
211 lines (192 loc) · 6.2 KB
/
sso.go
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package sso
import (
"context"
"fmt"
"net/http"
"strings"
"time"
"github.com/argoproj/pkg/jwt/zjwt"
"github.com/argoproj/pkg/rand"
"github.com/coreos/go-oidc"
log "github.com/sirupsen/logrus"
"golang.org/x/oauth2"
apiv1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"github.com/argoproj/argo/server/auth/jws"
)
const Prefix = "Bearer id_token:"
type Interface interface {
Authorize(ctx context.Context, authorization string) (*jws.ClaimSet, error)
HandleRedirect(writer http.ResponseWriter, request *http.Request)
HandleCallback(writer http.ResponseWriter, request *http.Request)
}
var _ Interface = &sso{}
type sso struct {
config *oauth2.Config
idTokenVerifier *oidc.IDTokenVerifier
baseHRef string
secure bool
}
type Config struct {
Issuer string `json:"issuer"`
ClientID apiv1.SecretKeySelector `json:"clientId"`
ClientSecret apiv1.SecretKeySelector `json:"clientSecret"`
RedirectURL string `json:"redirectUrl"`
}
// Abtsract methods of oidc.Provider that our code uses into an interface. That
// will allow us to implement a stub for unit testing. If you start using more
// oidc.Provider methods in this file, add them here and provide a stub
// implementation in test.
type providerInterface interface {
Endpoint() oauth2.Endpoint
Verifier(config *oidc.Config) *oidc.IDTokenVerifier
}
type providerFactory func(ctx context.Context, issuer string) (providerInterface, error)
func providerFactoryOIDC(ctx context.Context, issuer string) (providerInterface, error) {
return oidc.NewProvider(ctx, issuer)
}
func New(c Config, secretsIf corev1.SecretInterface, baseHRef string, secure bool) (Interface, error) {
return newSso(providerFactoryOIDC, c, secretsIf, baseHRef, secure)
}
func newSso(
factory providerFactory,
c Config,
secretsIf corev1.SecretInterface,
baseHRef string,
secure bool,
) (Interface, error) {
if c.Issuer == "" {
return nil, fmt.Errorf("issuer empty")
}
if c.ClientID.Name == "" || c.ClientID.Key == "" {
return nil, fmt.Errorf("clientID empty")
}
if c.ClientSecret.Name == "" || c.ClientSecret.Key == "" {
return nil, fmt.Errorf("clientSecret empty")
}
if c.RedirectURL == "" {
return nil, fmt.Errorf("redirectUrl empty")
}
clientSecretObj, err := secretsIf.Get(c.ClientSecret.Name, metav1.GetOptions{})
if err != nil {
return nil, err
}
provider, err := factory(context.Background(), c.Issuer)
if err != nil {
return nil, err
}
var clientIDObj *apiv1.Secret
if c.ClientID.Name == c.ClientSecret.Name {
clientIDObj = clientSecretObj
} else {
clientIDObj, err = secretsIf.Get(c.ClientID.Name, metav1.GetOptions{})
if err != nil {
return nil, err
}
}
clientID := clientIDObj.Data[c.ClientID.Key]
if clientID == nil {
return nil, fmt.Errorf("key %s missing in secret %s", c.ClientID.Key, c.ClientID.Name)
}
clientSecret := clientSecretObj.Data[c.ClientSecret.Key]
if clientSecret == nil {
return nil, fmt.Errorf("key %s missing in secret %s", c.ClientSecret.Key, c.ClientSecret.Name)
}
config := &oauth2.Config{
ClientID: string(clientID),
ClientSecret: string(clientSecret),
RedirectURL: c.RedirectURL,
Endpoint: provider.Endpoint(),
Scopes: []string{oidc.ScopeOpenID},
}
idTokenVerifier := provider.Verifier(&oidc.Config{ClientID: config.ClientID})
log.WithFields(log.Fields{"redirectUrl": config.RedirectURL, "issuer": c.Issuer, "clientId": c.ClientID}).Info("SSO configuration")
return &sso{config, idTokenVerifier, baseHRef, secure}, nil
}
const stateCookieName = "oauthState"
func (s *sso) HandleRedirect(w http.ResponseWriter, r *http.Request) {
state := rand.RandString(10)
http.SetCookie(w, &http.Cookie{
Name: stateCookieName,
Value: state,
Expires: time.Now().Add(3 * time.Minute),
HttpOnly: true,
SameSite: http.SameSiteLaxMode,
Secure: s.secure,
})
http.Redirect(w, r, s.config.AuthCodeURL(state), http.StatusFound)
}
func (s *sso) HandleCallback(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
state := r.URL.Query().Get("state")
cookie, err := r.Cookie(stateCookieName)
http.SetCookie(w, &http.Cookie{Name: stateCookieName, MaxAge: 0})
if err != nil {
w.WriteHeader(400)
_, _ = w.Write([]byte(fmt.Sprintf("invalid state: %v", err)))
return
}
if state != cookie.Value {
w.WriteHeader(401)
_, _ = w.Write([]byte("invalid state: does not match cookie value"))
return
}
oauth2Token, err := s.config.Exchange(ctx, r.URL.Query().Get("code"))
if err != nil {
w.WriteHeader(401)
_, _ = w.Write([]byte(fmt.Sprintf("failed to exchange token: %v", err)))
return
}
rawIDToken, ok := oauth2Token.Extra("id_token").(string)
if !ok {
w.WriteHeader(401)
_, _ = w.Write([]byte("failed to get id_token"))
return
}
idToken, err := s.idTokenVerifier.Verify(ctx, rawIDToken)
if err != nil {
w.WriteHeader(401)
_, _ = w.Write([]byte(fmt.Sprintf("failed to verify token: %v", err)))
return
}
c := &jws.ClaimSet{}
if err := idToken.Claims(c); err != nil {
w.WriteHeader(401)
_, _ = w.Write([]byte(fmt.Sprintf("failed to get claims: %v", err)))
return
}
token, err := zjwt.ZJWT(rawIDToken)
if err != nil {
w.WriteHeader(500)
_, _ = w.Write([]byte(fmt.Sprintf("failed to get compress token: %v", err)))
return
}
value := Prefix + token
log.Debugf("handing oauth2 callback %v", value)
http.SetCookie(w, &http.Cookie{
Value: value,
Name: "authorization",
Path: s.baseHRef,
Expires: time.Now().Add(10 * time.Hour),
SameSite: http.SameSiteStrictMode,
Secure: s.secure,
})
http.Redirect(w, r, s.baseHRef, 302)
}
// authorize verifies a bearer token and pulls user information form the claims.
func (s *sso) Authorize(ctx context.Context, authorization string) (*jws.ClaimSet, error) {
rawIDToken, err := zjwt.JWT(strings.TrimPrefix(authorization, Prefix))
if err != nil {
return nil, fmt.Errorf("failed to decompress token %v", err)
}
idToken, err := s.idTokenVerifier.Verify(ctx, rawIDToken)
if err != nil {
return nil, fmt.Errorf("failed to verify id_token %v", err)
}
c := &jws.ClaimSet{}
if err := idToken.Claims(c); err != nil {
return nil, fmt.Errorf("failed to parse claims: %v", err)
}
return c, nil
}