121 lines
3.1 KiB
Go
121 lines
3.1 KiB
Go
package main
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import (
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"context"
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"encoding/hex"
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"flag"
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"fmt"
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"log"
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"net/http"
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"golang.org/x/oauth2"
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"github.com/coreos/go-oidc/v3/oidc"
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"github.com/julienschmidt/httprouter"
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"git.nemunai.re/srs/adlin/libadlin"
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)
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var (
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oidcClientID = ""
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oidcSecret = ""
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oauth2Config oauth2.Config
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oidcVerifier *oidc.IDTokenVerifier
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)
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func init() {
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flag.StringVar(&oidcClientID, "oidc-clientid", oidcClientID, "ClientID for OIDC")
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flag.StringVar(&oidcSecret, "oidc-secret", oidcSecret, "Secret for OIDC")
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router.GET("/auth/CRI", redirectOIDC_CRI)
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router.GET("/auth/complete", OIDC_CRI_complete)
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}
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func initializeOIDC() {
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if oidcClientID != "" && oidcSecret != "" {
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provider, err := oidc.NewProvider(context.Background(), "https://cri.epita.fr")
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if err != nil {
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log.Fatal("Unable to setup oidc:", err)
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}
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oauth2Config = oauth2.Config{
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ClientID: oidcClientID,
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ClientSecret: oidcSecret,
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RedirectURL: "https://adlin.nemunai.re" + baseURL + "/auth/complete",
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// Discovery returns the OAuth2 endpoints.
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Endpoint: provider.Endpoint(),
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// "openid" is a required scope for OpenID Connect flows.
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Scopes: []string{oidc.ScopeOpenID, "profile", "email"},
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}
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oidcConfig := oidc.Config{
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ClientID: oidcClientID,
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}
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oidcVerifier = provider.Verifier(&oidcConfig)
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}
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}
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func redirectOIDC_CRI(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
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session, err := adlin.NewSession()
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if err != nil {
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http.Error(w, fmt.Sprintf("{'errmsg':%q}", err.Error()), http.StatusInternalServerError)
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} else {
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http.Redirect(w, r, oauth2Config.AuthCodeURL(hex.EncodeToString(session.Id)), http.StatusFound)
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}
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}
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func OIDC_CRI_complete(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
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idsession, err := hex.DecodeString(r.URL.Query().Get("state"))
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if err != nil {
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http.Error(w, fmt.Sprintf("{'errmsg':%q}", err.Error()), http.StatusBadRequest)
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return
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}
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session, err := adlin.GetSession(idsession)
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if err != nil {
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http.Error(w, fmt.Sprintf("{'errmsg':%q}", err.Error()), http.StatusBadRequest)
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return
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}
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oauth2Token, err := oauth2Config.Exchange(context.Background(), r.URL.Query().Get("code"))
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if err != nil {
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http.Error(w, "Failed to exchange token: "+err.Error(), http.StatusInternalServerError)
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return
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}
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rawIDToken, ok := oauth2Token.Extra("id_token").(string)
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if !ok {
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http.Error(w, "No id_token field in oauth2 token.", http.StatusInternalServerError)
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return
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}
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idToken, err := oidcVerifier.Verify(context.Background(), rawIDToken)
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if err != nil {
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http.Error(w, "Failed to verify ID Token: "+err.Error(), http.StatusInternalServerError)
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return
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}
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var claims struct {
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Firstname string `json:"given_name"`
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Lastname string `json:"family_name"`
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Nickname string `json:"nickname"`
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Username string `json:"preferred_username"`
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Email string `json:"email"`
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}
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if err := idToken.Claims(&claims); 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 err := completeAuth(w, claims.Username, session); 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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http.Redirect(w, r, "/", http.StatusFound)
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}
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