dex/connector/google/google.go

// Package google implements logging in through Google's OpenID Connect provider.
package google

import (
	"context"
	"errors"
	"fmt"
	"net/http"
	"time"

	"github.com/coreos/go-oidc"
	"github.com/sirupsen/logrus"
	"golang.org/x/oauth2"

	"github.com/dexidp/dex/connector"
)

const (
	issuerURL = "https://accounts.google.com"
)

// Config holds configuration options for OpenID Connect logins.
type Config struct {
	ClientID     string `json:"clientID"`
	ClientSecret string `json:"clientSecret"`
	RedirectURI  string `json:"redirectURI"`

	Scopes []string `json:"scopes"` // defaults to "profile" and "email"

	// Optional list of whitelisted domains
	// If this field is nonempty, only users from a listed domain will be allowed to log in
	HostedDomains []string `json:"hostedDomains"`
}

// Open returns a connector which can be used to login users through an upstream
// OpenID Connect provider.
func (c *Config) Open(id string, logger logrus.FieldLogger) (conn connector.Connector, err error) {
	ctx, cancel := context.WithCancel(context.Background())

	provider, err := oidc.NewProvider(ctx, issuerURL)
	if err != nil {
		cancel()
		return nil, fmt.Errorf("failed to get provider: %v", err)
	}

	scopes := []string{oidc.ScopeOpenID}
	if len(c.Scopes) > 0 {
		scopes = append(scopes, c.Scopes...)
	} else {
		scopes = append(scopes, "profile", "email")
	}

	clientID := c.ClientID
	return &googleConnector{
		redirectURI: c.RedirectURI,
		oauth2Config: &oauth2.Config{
			ClientID:     clientID,
			ClientSecret: c.ClientSecret,
			Endpoint:     provider.Endpoint(),
			Scopes:       scopes,
			RedirectURL:  c.RedirectURI,
		},
		verifier: provider.Verifier(
			&oidc.Config{ClientID: clientID},
		),
		logger:        logger,
		cancel:        cancel,
		hostedDomains: c.HostedDomains,
	}, nil
}

var (
	_ connector.CallbackConnector = (*googleConnector)(nil)
	_ connector.RefreshConnector  = (*googleConnector)(nil)
)

type googleConnector struct {
	redirectURI   string
	oauth2Config  *oauth2.Config
	verifier      *oidc.IDTokenVerifier
	ctx           context.Context
	cancel        context.CancelFunc
	logger        logrus.FieldLogger
	hostedDomains []string
}

func (c *googleConnector) Close() error {
	c.cancel()
	return nil
}

func (c *googleConnector) LoginURL(s connector.Scopes, callbackURL, state string) (string, error) {
	if c.redirectURI != callbackURL {
		return "", fmt.Errorf("expected callback URL %q did not match the URL in the config %q", callbackURL, c.redirectURI)
	}

	var opts []oauth2.AuthCodeOption
	if len(c.hostedDomains) > 0 {
		preferredDomain := c.hostedDomains[0]
		if len(c.hostedDomains) > 1 {
			preferredDomain = "*"
		}
		opts = append(opts, oauth2.SetAuthURLParam("hd", preferredDomain))
	}

	if s.OfflineAccess {
		opts = append(opts, oauth2.AccessTypeOffline, oauth2.SetAuthURLParam("prompt", "consent"))
	}
	return c.oauth2Config.AuthCodeURL(state, opts...), nil
}

type oauth2Error struct {
	error            string
	errorDescription string
}

func (e *oauth2Error) Error() string {
	if e.errorDescription == "" {
		return e.error
	}
	return e.error + ": " + e.errorDescription
}

func (c *googleConnector) HandleCallback(s connector.Scopes, r *http.Request) (identity connector.Identity, err error) {
	q := r.URL.Query()
	if errType := q.Get("error"); errType != "" {
		return identity, &oauth2Error{errType, q.Get("error_description")}
	}
	token, err := c.oauth2Config.Exchange(r.Context(), q.Get("code"))
	if err != nil {
		return identity, fmt.Errorf("google: failed to get token: %v", err)
	}

	return c.createIdentity(r.Context(), identity, token)
}

// Refresh is implemented for backwards compatibility, even though it's a no-op.
func (c *googleConnector) Refresh(ctx context.Context, s connector.Scopes, identity connector.Identity) (connector.Identity, error) {
	t := &oauth2.Token{
		RefreshToken: string(identity.ConnectorData),
		Expiry:       time.Now().Add(-time.Hour),
	}
	token, err := c.oauth2Config.TokenSource(ctx, t).Token()
	if err != nil {
		return identity, fmt.Errorf("google: failed to get token: %v", err)
	}

	return c.createIdentity(ctx, identity, token)
}

func (c *googleConnector) createIdentity(ctx context.Context, identity connector.Identity, token *oauth2.Token) (connector.Identity, error) {
	rawIDToken, ok := token.Extra("id_token").(string)
	if !ok {
		return identity, errors.New("google: no id_token in token response")
	}
	idToken, err := c.verifier.Verify(ctx, rawIDToken)
	if err != nil {
		return identity, fmt.Errorf("google: failed to verify ID Token: %v", err)
	}

	var claims struct {
		Username      string `json:"name"`
		Email         string `json:"email"`
		EmailVerified bool   `json:"email_verified"`
		HostedDomain  string `json:"hd"`
	}
	if err := idToken.Claims(&claims); err != nil {
		return identity, fmt.Errorf("oidc: failed to decode claims: %v", err)
	}

	if len(c.hostedDomains) > 0 {
		found := false
		for _, domain := range c.hostedDomains {
			if claims.HostedDomain == domain {
				found = true
				break
			}
		}

		if !found {
			return identity, fmt.Errorf("oidc: unexpected hd claim %v", claims.HostedDomain)
		}
	}

	identity = connector.Identity{
		UserID:        idToken.Subject,
		Username:      claims.Username,
		Email:         claims.Email,
		EmailVerified: claims.EmailVerified,
		ConnectorData: []byte(token.RefreshToken),
	}
	return identity, nil
}