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// Copyright 2022 The Sigstore Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package oidc
import (
"context"
"errors"
coreoidc "github.com/coreos/go-oidc/v3/oidc"
"golang.org/x/oauth2"
)
// IDToken is a structured representation of an OIDC IDToken.
type IDToken struct {
coreoidc.IDToken
}
// IDTokenSource provides `IDTokens`.
type IDTokenSource interface {
// IDToken returns an ID token or an error.
IDToken(context.Context) (*IDToken, error)
}
type staticIDTokenSource struct {
idt *IDToken
}
func (s staticIDTokenSource) IDToken(context.Context) (*IDToken, error) {
return s.idt, nil
}
// StaticIDTokenSource returns an `IDTokenSource` which always returns the given `IDToken`.
func StaticIDTokenSource(idt *IDToken) IDTokenSource {
return staticIDTokenSource{idt: idt}
}
// extractAndVerifyIDToken extracts the ID token from the given `oauth2.Token`, then verifies it against the given verifier and nonce.
func extractAndVerifyIDToken(ctx context.Context, t *oauth2.Token, v *coreoidc.IDTokenVerifier, nonce string) (*IDToken, error) {
// requesting 'openid' scope should ensure an id_token is given when exchanging the code for an access token
unverifiedIDToken, ok := t.Extra("id_token").(string)
if !ok {
return nil, errors.New("id_token not present")
}
// verify nonce, client ID, access token hash before using it
idToken, err := v.Verify(ctx, unverifiedIDToken)
if err != nil {
return nil, err
}
if idToken.Nonce != nonce {
return nil, errors.New("nonce does not match value sent")
}
if idToken.AccessTokenHash != "" {
if err := idToken.VerifyAccessToken(t.AccessToken); err != nil {
return nil, err
}
}
return &IDToken{*idToken}, nil
}
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