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adfs.go
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adfs.go
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// Copyright 2022 The Casdoor Authors. All Rights Reserved.
//
// 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 idp
import (
"bytes"
"crypto/tls"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"time"
"github.com/lestrrat-go/jwx/jwa"
"github.com/lestrrat-go/jwx/jwk"
"github.com/lestrrat-go/jwx/jwt"
"golang.org/x/oauth2"
)
type AdfsIdProvider struct {
Client *http.Client
Config *oauth2.Config
Host string
}
func NewAdfsIdProvider(clientId string, clientSecret string, redirectUrl string, hostUrl string) *AdfsIdProvider {
idp := &AdfsIdProvider{}
config := idp.getConfig(hostUrl)
config.ClientID = clientId
config.ClientSecret = clientSecret
config.RedirectURL = redirectUrl
idp.Config = config
idp.Host = hostUrl
return idp
}
func (idp *AdfsIdProvider) SetHttpClient(client *http.Client) {
tr := &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: true,
},
}
idp.Client = client
idp.Client.Transport = tr
}
func (idp *AdfsIdProvider) getConfig(hostUrl string) *oauth2.Config {
endpoint := oauth2.Endpoint{
AuthURL: fmt.Sprintf("%s/adfs/oauth2/authorize", hostUrl),
TokenURL: fmt.Sprintf("%s/adfs/oauth2/token", hostUrl),
}
config := &oauth2.Config{
Endpoint: endpoint,
}
return config
}
type AdfsToken struct {
IdToken string `json:"id_token"`
ExpiresIn int `json:"expires_in"`
ErrMsg string `json:"error_description"`
}
// get more detail via: https://docs.microsoft.com/en-us/windows-server/identity/ad-fs/overview/ad-fs-openid-connect-oauth-flows-scenarios#request-an-access-token
func (idp *AdfsIdProvider) GetToken(code string) (*oauth2.Token, error) {
payload := url.Values{}
payload.Set("code", code)
payload.Set("grant_type", "authorization_code")
payload.Set("client_id", idp.Config.ClientID)
payload.Set("redirect_uri", idp.Config.RedirectURL)
resp, err := idp.Client.PostForm(idp.Config.Endpoint.TokenURL, payload)
if err != nil {
return nil, err
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
pToken := &AdfsToken{}
err = json.Unmarshal(data, pToken)
if err != nil {
return nil, fmt.Errorf("fail to unmarshal token response: %s", err.Error())
}
if pToken.ErrMsg != "" {
return nil, fmt.Errorf("pToken.Errmsg = %s", pToken.ErrMsg)
}
token := &oauth2.Token{
AccessToken: pToken.IdToken,
Expiry: time.Unix(time.Now().Unix()+int64(pToken.ExpiresIn), 0),
}
return token, nil
}
// Since the userinfo endpoint of ADFS only returns sub,
// the id_token is used to resolve the userinfo
func (idp *AdfsIdProvider) GetUserInfo(token *oauth2.Token) (*UserInfo, error) {
resp, err := idp.Client.Get(fmt.Sprintf("%s/adfs/discovery/keys", idp.Host))
if err != nil {
return nil, err
}
keyset, err := jwk.Parse(resp.Body)
if err != nil {
return nil, err
}
tokenSrc := []byte(token.AccessToken)
publicKey, _ := keyset.Keys[0].Materialize()
id_token, _ := jwt.Parse(bytes.NewReader(tokenSrc), jwt.WithVerify(jwa.RS256, publicKey))
sid, _ := id_token.Get("sid")
upn, _ := id_token.Get("upn")
name, _ := id_token.Get("unique_name")
userinfo := &UserInfo{
Id: sid.(string),
Username: name.(string),
DisplayName: name.(string),
Email: upn.(string),
}
return userinfo, nil
}