Jan Dittberner
25b101afae
- add linter config and fix golangci-lint warnings - rename module to match new repository location - use embedded resources for static assets, templates and translations - recommend mkcert in README - require at least Go 1.19 - update and tidy dependencies - update copyright information - improve Makefile, add lint and static asset targets
124 lines
3.3 KiB
Go
124 lines
3.3 KiB
Go
/*
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Copyright 2020-2023 CAcert Inc.
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SPDX-License-Identifier: Apache-2.0
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package handlers
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import (
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"bytes"
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"encoding/base64"
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"encoding/json"
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"errors"
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"fmt"
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"net/http"
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"net/url"
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"github.com/lestrrat-go/jwx/jwk"
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"github.com/lestrrat-go/jwx/jwt"
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"github.com/lestrrat-go/jwx/jwt/openid"
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log "github.com/sirupsen/logrus"
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"golang.org/x/oauth2"
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"code.cacert.org/cacert/oidc-demo-app/models"
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"code.cacert.org/cacert/oidc-demo-app/services"
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)
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const (
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sessionName = "resource_session"
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oauth2RedirectStateLength = 8
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)
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func Authenticate(logger *log.Logger, oauth2Config *oauth2.Config, clientID string) func(http.Handler) http.Handler {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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session, err := services.GetSessionStore().Get(r, sessionName)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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if _, ok := session.Values[sessionKeyIDToken]; ok {
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next.ServeHTTP(w, r)
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return
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}
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session.Values[sessionRedirectTarget] = r.URL.String()
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if err = session.Save(r, w); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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var authURL *url.URL
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if authURL, err = url.Parse(oauth2Config.Endpoint.AuthURL); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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queryValues := authURL.Query()
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queryValues.Set("client_id", clientID)
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queryValues.Set("response_type", "code")
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queryValues.Set("scope", "openid offline_access profile email")
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queryValues.Set("state", base64.URLEncoding.EncodeToString(services.GenerateKey(oauth2RedirectStateLength)))
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queryValues.Set("claims", getRequestedClaims(logger))
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authURL.RawQuery = queryValues.Encode()
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w.Header().Set("Location", authURL.String())
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w.WriteHeader(http.StatusFound)
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})
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}
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}
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func getRequestedClaims(logger *log.Logger) string {
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claims := make(models.OIDCClaimsRequest)
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claims["userinfo"] = make(models.ClaimElement)
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essentialItem := make(models.IndividualClaimRequest)
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essentialItem["essential"] = true
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claims["userinfo"]["https://auth.cacert.org/groups"] = &essentialItem
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target := make([]byte, 0)
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buf := bytes.NewBuffer(target)
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enc := json.NewEncoder(buf)
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if err := enc.Encode(claims); err != nil {
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logger.WithError(err).Warn("could not encode claims request parameter")
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}
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return buf.String()
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}
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func ParseIDToken(token string, keySet jwk.Set) (openid.Token, error) {
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var (
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parsedIDToken jwt.Token
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err error
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)
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if parsedIDToken, err = jwt.ParseString(token, jwt.WithKeySet(keySet), jwt.WithToken(openid.New())); err != nil {
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return nil, fmt.Errorf("could not parse ID token: %w", err)
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}
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if v, ok := parsedIDToken.(openid.Token); ok {
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return v, nil
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}
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return nil, errors.New("ID token is no OpenID Connect Identity Token")
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}
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