oauth2_proxy/providers/oidc.go
2018-06-21 11:44:38 +01:00

136 lines
3.3 KiB
Go

package providers
import (
"context"
"fmt"
"time"
"golang.org/x/oauth2"
oidc "github.com/coreos/go-oidc"
)
type OIDCProvider struct {
*ProviderData
Verifier *oidc.IDTokenVerifier
}
func NewOIDCProvider(p *ProviderData) *OIDCProvider {
p.ProviderName = "OpenID Connect"
return &OIDCProvider{ProviderData: p}
}
func (p *OIDCProvider) Redeem(redirectURL, code string) (s *SessionState, err error) {
ctx := context.Background()
c := oauth2.Config{
ClientID: p.ClientID,
ClientSecret: p.ClientSecret,
Endpoint: oauth2.Endpoint{
TokenURL: p.RedeemURL.String(),
},
RedirectURL: redirectURL,
}
token, err := c.Exchange(ctx, code)
if err != nil {
return nil, fmt.Errorf("token exchange: %v", err)
}
s, err = p.createSessionState(token, ctx)
if err != nil {
return nil, fmt.Errorf("unable to update session: %v", err)
}
return
}
func (p *OIDCProvider) RefreshSessionIfNeeded(s *SessionState) (bool, error) {
if s == nil || s.ExpiresOn.After(time.Now()) || s.RefreshToken == "" {
return false, nil
}
origExpiration := s.ExpiresOn
err := p.redeemRefreshToken(s)
if err != nil {
return false, fmt.Errorf("unable to redeem refresh token: %v", err)
}
fmt.Printf("refreshed id token %s (expired on %s)\n", s, origExpiration)
return true, nil
}
func (p *OIDCProvider) redeemRefreshToken(s *SessionState) (err error) {
c := oauth2.Config{
ClientID: p.ClientID,
ClientSecret: p.ClientSecret,
Endpoint: oauth2.Endpoint{
TokenURL: p.RedeemURL.String(),
},
}
ctx := context.Background()
t := &oauth2.Token{
RefreshToken: s.RefreshToken,
Expiry: time.Now().Add(-time.Hour),
}
token, err := c.TokenSource(ctx, t).Token()
if err != nil {
return fmt.Errorf("failed to get token: %v", err)
}
newSession, err := p.createSessionState(token, ctx)
if err != nil {
return fmt.Errorf("unable to update session: %v", err)
}
s.AccessToken = newSession.AccessToken
s.IdToken = newSession.IdToken
s.RefreshToken = newSession.RefreshToken
s.ExpiresOn = newSession.ExpiresOn
s.Email = newSession.Email
return
}
func (p *OIDCProvider) createSessionState(token *oauth2.Token, ctx context.Context) (*SessionState, error) {
rawIDToken, ok := token.Extra("id_token").(string)
if !ok {
return nil, fmt.Errorf("token response did not contain an id_token")
}
// Parse and verify ID Token payload.
idToken, err := p.Verifier.Verify(ctx, rawIDToken)
if err != nil {
return nil, fmt.Errorf("could not verify id_token: %v", err)
}
// Extract custom claims.
var claims struct {
Email string `json:"email"`
Verified *bool `json:"email_verified"`
}
if err := idToken.Claims(&claims); err != nil {
return nil, fmt.Errorf("failed to parse id_token claims: %v", err)
}
if claims.Email == "" {
return nil, fmt.Errorf("id_token did not contain an email")
}
if claims.Verified != nil && !*claims.Verified {
return nil, fmt.Errorf("email in id_token (%s) isn't verified", claims.Email)
}
return &SessionState{
AccessToken: token.AccessToken,
IdToken: rawIDToken,
RefreshToken: token.RefreshToken,
ExpiresOn: token.Expiry,
Email: claims.Email,
}, nil
}
func (p *OIDCProvider) ValidateSessionState(s *SessionState) bool {
ctx := context.Background()
_, err := p.Verifier.Verify(ctx, s.IdToken)
if err != nil {
return false
}
return true
}