97 lines
3 KiB
Go
97 lines
3 KiB
Go
|
/*
|
||
|
|
Copyright 2020, 2021 Jan Dittberner
|
||
|
|
|
||
|
|
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 handlers
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"context"
|
||
|
|
"encoding/base64"
|
||
|
|
"encoding/json"
|
||
|
|
"net/http"
|
||
|
|
"net/url"
|
||
|
|
|
||
|
|
"github.com/lestrrat-go/jwx/jwk"
|
||
|
|
"github.com/lestrrat-go/jwx/jwt"
|
||
|
|
"github.com/lestrrat-go/jwx/jwt/openid"
|
||
|
|
log "github.com/sirupsen/logrus"
|
||
|
|
|
||
|
|
"git.cacert.org/oidc_demo_app/models"
|
||
|
|
"git.cacert.org/oidc_demo_app/services"
|
||
|
|
)
|
||
|
|
|
||
|
|
const sessionName = "resource_session"
|
||
|
|
|
||
|
|
func Authenticate(ctx context.Context, logger *log.Logger, clientId string) func(http.Handler) http.Handler {
|
||
|
|
return func(next http.Handler) http.Handler {
|
||
|
|
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||
|
|
session, err := services.GetSessionStore().Get(r, sessionName)
|
||
|
|
if err != nil {
|
||
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if _, ok := session.Values[sessionKeyIdToken]; ok {
|
||
|
|
next.ServeHTTP(w, r)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
session.Values[sessionRedirectTarget] = r.URL.String()
|
||
|
|
if err = session.Save(r, w); err != nil {
|
||
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
var authUrl *url.URL
|
||
|
|
if authUrl, err = url.Parse(services.GetOAuth2Config(ctx).Endpoint.AuthURL); err != nil {
|
||
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
queryValues := authUrl.Query()
|
||
|
|
queryValues.Set("client_id", clientId)
|
||
|
|
queryValues.Set("response_type", "code")
|
||
|
|
queryValues.Set("scope", "openid offline_access profile email")
|
||
|
|
queryValues.Set("state", base64.URLEncoding.EncodeToString(services.GenerateKey(8)))
|
||
|
|
queryValues.Set("claims", getRequestedClaims(logger))
|
||
|
|
authUrl.RawQuery = queryValues.Encode()
|
||
|
|
|
||
|
|
w.Header().Set("Location", authUrl.String())
|
||
|
|
w.WriteHeader(http.StatusFound)
|
||
|
|
})
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func getRequestedClaims(logger *log.Logger) string {
|
||
|
|
claims := make(models.OIDCClaimsRequest)
|
||
|
|
claims["userinfo"] = make(models.ClaimElement)
|
||
|
|
essentialItem := make(models.IndividualClaimRequest)
|
||
|
|
essentialItem["essential"] = true
|
||
|
|
claims["userinfo"]["https://cacert.localhost/groups"] = &essentialItem
|
||
|
|
|
||
|
|
target := make([]byte, 0)
|
||
|
|
buf := bytes.NewBuffer(target)
|
||
|
|
enc := json.NewEncoder(buf)
|
||
|
|
if err := enc.Encode(claims); err != nil {
|
||
|
|
logger.Warnf("could not encode claims request parameter: %v", err)
|
||
|
|
}
|
||
|
|
return buf.String()
|
||
|
|
}
|
||
|
|
|
||
|
|
func ParseIdToken(token string, keySet jwk.Set) (openid.Token, error) {
|
||
|
|
if parsedIdToken, err := jwt.ParseString(token, jwt.WithKeySet(keySet), jwt.WithToken(openid.New())); err != nil {
|
||
|
|
return nil, err
|
||
|
|
} else {
|
||
|
|
return parsedIdToken.(openid.Token), nil
|
||
|
|
}
|
||
|
|
}
|