361 lines
11 KiB
Go
361 lines
11 KiB
Go
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package web
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import (
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"encoding/json"
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"fmt"
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"h4kor/owl-blogs"
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"net/http"
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"net/url"
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"strings"
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"github.com/julienschmidt/httprouter"
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)
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func userAuthMetadataHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
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user, err := getUserFromRepo(repo, ps)
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if err != nil {
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println("Error getting user: ", err.Error())
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notFoundHandler(repo)(w, r)
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return
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}
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type Response struct {
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Issuer string `json:"issuer"`
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AuthorizationEndpoint string `json:"authorization_endpoint"`
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TokenEndpoint string `json:"token_endpoint"`
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CodeChallengeMethodsSupported []string `json:"code_challenge_methods_supported"`
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ScopesSupported []string `json:"scopes_supported"`
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ResponseTypesSupported []string `json:"response_types_supported"`
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GrantTypesSupported []string `json:"grant_types_supported"`
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}
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response := Response{
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Issuer: user.FullUrl(),
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AuthorizationEndpoint: user.AuthUrl(),
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TokenEndpoint: user.TokenUrl(),
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CodeChallengeMethodsSupported: []string{"S256", "plain"},
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ScopesSupported: []string{"profile"},
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ResponseTypesSupported: []string{"code"},
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GrantTypesSupported: []string{"authorization_code"},
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}
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jsonData, err := json.Marshal(response)
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if err != nil {
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println("Error marshalling json: ", err.Error())
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w.WriteHeader(http.StatusInternalServerError)
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w.Write([]byte("Internal server error"))
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}
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w.Write(jsonData)
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}
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}
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func userAuthHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
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user, err := getUserFromRepo(repo, ps)
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if err != nil {
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println("Error getting user: ", err.Error())
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notFoundHandler(repo)(w, r)
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return
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}
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// get me, cleint_id, redirect_uri, state and response_type from query
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me := r.URL.Query().Get("me")
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clientId := r.URL.Query().Get("client_id")
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redirectUri := r.URL.Query().Get("redirect_uri")
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state := r.URL.Query().Get("state")
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responseType := r.URL.Query().Get("response_type")
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codeChallenge := r.URL.Query().Get("code_challenge")
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codeChallengeMethod := r.URL.Query().Get("code_challenge_method")
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scope := r.URL.Query().Get("scope")
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// check if request is valid
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missing_params := []string{}
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if clientId == "" {
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missing_params = append(missing_params, "client_id")
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}
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if redirectUri == "" {
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missing_params = append(missing_params, "redirect_uri")
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}
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if responseType == "" {
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missing_params = append(missing_params, "response_type")
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}
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if len(missing_params) > 0 {
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte(fmt.Sprintf("Missing parameters: %s", strings.Join(missing_params, ", "))))
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return
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}
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if responseType != "id" {
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responseType = "code"
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}
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if responseType != "code" {
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte("Invalid response_type. Must be 'code' ('id' converted to 'code' for legacy support)."))
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return
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}
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if codeChallengeMethod != "" && (codeChallengeMethod != "S256" && codeChallengeMethod != "plain") {
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte("Invalid code_challenge_method. Must be 'S256' or 'plain'."))
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return
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}
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client_id_url, err := url.Parse(clientId)
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if err != nil {
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte("Invalid client_id."))
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return
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}
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redirect_uri_url, err := url.Parse(redirectUri)
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if err != nil {
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte("Invalid redirect_uri."))
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return
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}
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if client_id_url.Host != redirect_uri_url.Host || client_id_url.Scheme != redirect_uri_url.Scheme {
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// check if redirect_uri is registered
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resp, _ := repo.HttpClient.Get(clientId)
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registered_redirects, _ := repo.Parser.GetRedirctUris(resp)
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is_registered := false
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for _, registered_redirect := range registered_redirects {
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if registered_redirect == redirectUri {
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// redirect_uri is registered
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is_registered = true
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break
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}
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}
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if !is_registered {
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte("Invalid redirect_uri. Must be registered with client_id."))
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return
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}
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}
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// Double Submit Cookie Pattern
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// https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html#double-submit-cookie
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csrfToken := owl.GenerateRandomString(32)
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cookie := http.Cookie{
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Name: "csrf_token",
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Value: csrfToken,
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HttpOnly: true,
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SameSite: http.SameSiteStrictMode,
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}
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http.SetCookie(w, &cookie)
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reqData := owl.AuthRequestData{
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Me: me,
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ClientId: clientId,
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RedirectUri: redirectUri,
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State: state,
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Scope: scope,
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ResponseType: responseType,
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CodeChallenge: codeChallenge,
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CodeChallengeMethod: codeChallengeMethod,
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User: user,
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CsrfToken: csrfToken,
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}
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html, err := owl.RenderUserAuthPage(reqData)
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if err != nil {
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println("Error rendering auth page: ", err.Error())
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w.WriteHeader(http.StatusInternalServerError)
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w.Write([]byte("Internal server error"))
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return
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}
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println("Rendering auth page for user", user.Name())
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w.Write([]byte(html))
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}
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}
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func verifyAuthCodeRequest(user owl.User, w http.ResponseWriter, r *http.Request) (bool, owl.AuthCode) {
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// get form data from post request
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err := r.ParseForm()
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if err != nil {
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println("Error parsing form: ", err.Error())
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte("Error parsing form"))
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return false, owl.AuthCode{}
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}
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code := r.Form.Get("code")
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client_id := r.Form.Get("client_id")
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redirect_uri := r.Form.Get("redirect_uri")
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code_verifier := r.Form.Get("code_verifier")
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// check if request is valid
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valid, authCode := user.VerifyAuthCode(code, client_id, redirect_uri, code_verifier)
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if !valid {
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w.WriteHeader(http.StatusUnauthorized)
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w.Write([]byte("Invalid code"))
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}
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return valid, authCode
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}
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func userAuthProfileHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
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user, err := getUserFromRepo(repo, ps)
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if err != nil {
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println("Error getting user: ", err.Error())
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notFoundHandler(repo)(w, r)
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return
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}
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valid, _ := verifyAuthCodeRequest(user, w, r)
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if valid {
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w.WriteHeader(http.StatusOK)
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type ResponseProfile struct {
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Name string `json:"name"`
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Url string `json:"url"`
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Photo string `json:"photo"`
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}
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type Response struct {
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Me string `json:"me"`
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Profile ResponseProfile `json:"profile"`
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}
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response := Response{
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Me: user.FullUrl(),
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Profile: ResponseProfile{
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Name: user.Name(),
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Url: user.FullUrl(),
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Photo: user.AvatarUrl(),
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},
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}
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jsonData, err := json.Marshal(response)
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if err != nil {
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println("Error marshalling json: ", err.Error())
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w.WriteHeader(http.StatusInternalServerError)
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w.Write([]byte("Internal server error"))
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}
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w.Write(jsonData)
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return
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}
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}
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}
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func userAuthTokenHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
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user, err := getUserFromRepo(repo, ps)
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if err != nil {
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println("Error getting user: ", err.Error())
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notFoundHandler(repo)(w, r)
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return
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}
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valid, authCode := verifyAuthCodeRequest(user, w, r)
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if valid {
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if authCode.Scope == "" {
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte("Empty scope, no token issued"))
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return
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}
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type Response struct {
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Me string `json:"me"`
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TokenType string `json:"token_type"`
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AccessToken string `json:"access_token"`
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Scope string `json:"scope"`
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ExpiresIn int `json:"expires_in"`
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RefreshToken string `json:"refresh_token"`
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}
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accessToken, duration, err := user.GenerateAccessToken(authCode)
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if err != nil {
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println("Error generating access token: ", err.Error())
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w.WriteHeader(http.StatusInternalServerError)
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w.Write([]byte("Internal server error"))
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return
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}
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response := Response{
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Me: user.FullUrl(),
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TokenType: "Bearer",
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AccessToken: accessToken,
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Scope: authCode.Scope,
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ExpiresIn: duration,
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}
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jsonData, err := json.Marshal(response)
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if err != nil {
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println("Error marshalling json: ", err.Error())
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w.WriteHeader(http.StatusInternalServerError)
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w.Write([]byte("Internal server error"))
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}
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w.Write(jsonData)
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return
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}
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}
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}
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func userAuthVerifyHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
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user, err := getUserFromRepo(repo, ps)
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if err != nil {
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println("Error getting user: ", err.Error())
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notFoundHandler(repo)(w, r)
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return
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}
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// get form data from post request
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err = r.ParseForm()
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if err != nil {
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println("Error parsing form: ", err.Error())
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte("Error parsing form"))
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return
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}
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password := r.FormValue("password")
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client_id := r.FormValue("client_id")
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redirect_uri := r.FormValue("redirect_uri")
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response_type := r.FormValue("response_type")
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state := r.FormValue("state")
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code_challenge := r.FormValue("code_challenge")
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code_challenge_method := r.FormValue("code_challenge_method")
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scope := r.FormValue("scope")
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// CSRF check
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formCsrfToken := r.FormValue("csrf_token")
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cookieCsrfToken, err := r.Cookie("csrf_token")
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if err != nil {
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println("Error getting csrf token from cookie: ", err.Error())
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte("Error getting csrf token from cookie"))
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return
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}
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if formCsrfToken != cookieCsrfToken.Value {
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println("Invalid csrf token")
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte("Invalid csrf token"))
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return
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}
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password_valid := user.VerifyPassword(password)
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if !password_valid {
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redirect := fmt.Sprintf(
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"%s?error=invalid_password&client_id=%s&redirect_uri=%s&response_type=%s&state=%s",
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user.AuthUrl(), client_id, redirect_uri, response_type, state,
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)
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if code_challenge != "" {
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redirect += fmt.Sprintf("&code_challenge=%s&code_challenge_method=%s", code_challenge, code_challenge_method)
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}
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http.Redirect(w, r,
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redirect,
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http.StatusFound,
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)
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return
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} else {
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// password is valid, generate code
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code, err := user.GenerateAuthCode(
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client_id, redirect_uri, code_challenge, code_challenge_method, scope)
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if err != nil {
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println("Error generating code: ", err.Error())
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w.WriteHeader(http.StatusInternalServerError)
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w.Write([]byte("Internal server error"))
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return
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}
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http.Redirect(w, r,
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fmt.Sprintf(
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"%s?code=%s&state=%s&iss=%s",
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redirect_uri, code, state,
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user.FullUrl(),
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),
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http.StatusFound,
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)
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return
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}
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}
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}
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