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* 2xx/3xx/4xx/5xx -> http.Status... * http.StatusFound -> http.StatusTemporaryRedirect * http.StatusMovedPermanently -> http.StatusPermanentRedirect
257 lines
7.6 KiB
Go
257 lines
7.6 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package auth
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import (
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"errors"
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"net/http"
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"strings"
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"code.gitea.io/gitea/models/auth"
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"code.gitea.io/gitea/models/avatars"
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user_model "code.gitea.io/gitea/models/user"
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"code.gitea.io/gitea/modules/base"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/templates"
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"code.gitea.io/gitea/modules/web/middleware"
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"code.gitea.io/gitea/services/auth/source/sspi"
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"code.gitea.io/gitea/services/mailer"
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gouuid "github.com/google/uuid"
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"github.com/quasoft/websspi"
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"github.com/unrolled/render"
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)
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const (
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tplSignIn base.TplName = "user/auth/signin"
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)
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var (
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// sspiAuth is a global instance of the websspi authentication package,
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// which is used to avoid acquiring the server credential handle on
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// every request
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sspiAuth *websspi.Authenticator
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// Ensure the struct implements the interface.
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_ Method = &SSPI{}
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_ Named = &SSPI{}
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_ Initializable = &SSPI{}
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_ Freeable = &SSPI{}
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)
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// SSPI implements the SingleSignOn interface and authenticates requests
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// via the built-in SSPI module in Windows for SPNEGO authentication.
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// On successful authentication returns a valid user object.
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// Returns nil if authentication fails.
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type SSPI struct {
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rnd *render.Render
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}
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// Init creates a new global websspi.Authenticator object
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func (s *SSPI) Init() error {
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config := websspi.NewConfig()
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var err error
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sspiAuth, err = websspi.New(config)
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if err != nil {
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return err
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}
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s.rnd = render.New(render.Options{
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Extensions: []string{".tmpl"},
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Directory: "templates",
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Funcs: templates.NewFuncMap(),
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Asset: templates.GetAsset,
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AssetNames: templates.GetAssetNames,
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IsDevelopment: !setting.IsProd,
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})
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return nil
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}
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// Name represents the name of auth method
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func (s *SSPI) Name() string {
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return "sspi"
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}
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// Free releases resources used by the global websspi.Authenticator object
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func (s *SSPI) Free() error {
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return sspiAuth.Free()
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}
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// Verify uses SSPI (Windows implementation of SPNEGO) to authenticate the request.
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// If authentication is successful, returns the corresponding user object.
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// If negotiation should continue or authentication fails, immediately returns a 401 HTTP
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// response code, as required by the SPNEGO protocol.
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func (s *SSPI) Verify(req *http.Request, w http.ResponseWriter, store DataStore, sess SessionStore) *user_model.User {
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if !s.shouldAuthenticate(req) {
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return nil
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}
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cfg, err := s.getConfig()
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if err != nil {
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log.Error("could not get SSPI config: %v", err)
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return nil
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}
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log.Trace("SSPI Authorization: Attempting to authenticate")
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userInfo, outToken, err := sspiAuth.Authenticate(req, w)
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if err != nil {
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log.Warn("Authentication failed with error: %v\n", err)
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sspiAuth.AppendAuthenticateHeader(w, outToken)
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// Include the user login page in the 401 response to allow the user
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// to login with another authentication method if SSPI authentication
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// fails
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store.GetData()["Flash"] = map[string]string{
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"ErrorMsg": err.Error(),
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}
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store.GetData()["EnableOpenIDSignIn"] = setting.Service.EnableOpenIDSignIn
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store.GetData()["EnableSSPI"] = true
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err := s.rnd.HTML(w, http.StatusUnauthorized, string(tplSignIn), templates.BaseVars().Merge(store.GetData()))
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if err != nil {
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log.Error("%v", err)
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}
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return nil
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}
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if outToken != "" {
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sspiAuth.AppendAuthenticateHeader(w, outToken)
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}
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username := sanitizeUsername(userInfo.Username, cfg)
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if len(username) == 0 {
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return nil
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}
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log.Info("Authenticated as %s\n", username)
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user, err := user_model.GetUserByName(username)
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if err != nil {
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if !user_model.IsErrUserNotExist(err) {
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log.Error("GetUserByName: %v", err)
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return nil
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}
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if !cfg.AutoCreateUsers {
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log.Error("User '%s' not found", username)
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return nil
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}
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user, err = s.newUser(username, cfg)
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if err != nil {
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log.Error("CreateUser: %v", err)
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return nil
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}
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}
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// Make sure requests to API paths and PWA resources do not create a new session
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if !middleware.IsAPIPath(req) && !isAttachmentDownload(req) {
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handleSignIn(w, req, sess, user)
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}
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log.Trace("SSPI Authorization: Logged in user %-v", user)
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return user
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}
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// getConfig retrieves the SSPI configuration from login sources
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func (s *SSPI) getConfig() (*sspi.Source, error) {
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sources, err := auth.ActiveSources(auth.SSPI)
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if err != nil {
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return nil, err
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}
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if len(sources) == 0 {
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return nil, errors.New("no active login sources of type SSPI found")
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}
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if len(sources) > 1 {
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return nil, errors.New("more than one active login source of type SSPI found")
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}
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return sources[0].Cfg.(*sspi.Source), nil
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}
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func (s *SSPI) shouldAuthenticate(req *http.Request) (shouldAuth bool) {
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shouldAuth = false
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path := strings.TrimSuffix(req.URL.Path, "/")
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if path == "/user/login" {
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if req.FormValue("user_name") != "" && req.FormValue("password") != "" {
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shouldAuth = false
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} else if req.FormValue("auth_with_sspi") == "1" {
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shouldAuth = true
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}
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} else if middleware.IsAPIPath(req) || isAttachmentDownload(req) {
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shouldAuth = true
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}
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return
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}
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// newUser creates a new user object for the purpose of automatic registration
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// and populates its name and email with the information present in request headers.
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func (s *SSPI) newUser(username string, cfg *sspi.Source) (*user_model.User, error) {
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email := gouuid.New().String() + "@localhost.localdomain"
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user := &user_model.User{
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Name: username,
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Email: email,
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KeepEmailPrivate: true,
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Passwd: gouuid.New().String(),
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IsActive: cfg.AutoActivateUsers,
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Language: cfg.DefaultLanguage,
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UseCustomAvatar: true,
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Avatar: avatars.DefaultAvatarLink(),
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EmailNotificationsPreference: user_model.EmailNotificationsDisabled,
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}
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if err := user_model.CreateUser(user); err != nil {
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return nil, err
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}
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mailer.SendRegisterNotifyMail(user)
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return user, nil
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}
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// stripDomainNames removes NETBIOS domain name and separator from down-level logon names
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// (eg. "DOMAIN\user" becomes "user"), and removes the UPN suffix (domain name) and separator
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// from UPNs (eg. "user@domain.local" becomes "user")
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func stripDomainNames(username string) string {
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if strings.Contains(username, "\\") {
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parts := strings.SplitN(username, "\\", 2)
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if len(parts) > 1 {
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username = parts[1]
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}
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} else if strings.Contains(username, "@") {
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parts := strings.Split(username, "@")
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if len(parts) > 1 {
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username = parts[0]
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}
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}
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return username
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}
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func replaceSeparators(username string, cfg *sspi.Source) string {
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newSep := cfg.SeparatorReplacement
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username = strings.ReplaceAll(username, "\\", newSep)
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username = strings.ReplaceAll(username, "/", newSep)
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username = strings.ReplaceAll(username, "@", newSep)
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return username
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}
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func sanitizeUsername(username string, cfg *sspi.Source) string {
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if len(username) == 0 {
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return ""
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}
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if cfg.StripDomainNames {
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username = stripDomainNames(username)
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}
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// Replace separators even if we have already stripped the domain name part,
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// as the username can contain several separators: eg. "MICROSOFT\useremail@live.com"
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username = replaceSeparators(username, cfg)
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return username
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}
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// specialInit registers the SSPI auth method as the last method in the list.
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// The SSPI plugin is expected to be executed last, as it returns 401 status code if negotiation
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// fails (or if negotiation should continue), which would prevent other authentication methods
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// to execute at all.
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func specialInit() {
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if auth.IsSSPIEnabled() {
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Register(&SSPI{})
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}
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}
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