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* Skip SSPI authentication attempts for /api/internal SSPI fails badly on authentication attempts to /api/internal which it can never succesfully authenticate. Fix #11260 Signed-off-by: Andrew Thornton <art27@cantab.net> * Update oauth2.go Co-authored-by: techknowlogick <techknowlogick@gitea.io> Co-authored-by: Lauris BH <lauris@nix.lv>
240 lines
7.1 KiB
Go
240 lines
7.1 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 sso
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import (
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"errors"
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"reflect"
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"strings"
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"code.gitea.io/gitea/models"
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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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"gitea.com/macaron/macaron"
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"gitea.com/macaron/session"
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gouuid "github.com/google/uuid"
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"github.com/quasoft/websspi"
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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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_ SingleSignOn = &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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}
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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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return err
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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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// IsEnabled checks if there is an active SSPI authentication source
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func (s *SSPI) IsEnabled() bool {
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return models.IsSSPIEnabled()
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}
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// VerifyAuthData uses SSPI (Windows implementation of SPNEGO) to authenticate the request.
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// If authentication is successful, returs 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) VerifyAuthData(ctx *macaron.Context, sess session.Store) *models.User {
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if !s.shouldAuthenticate(ctx) {
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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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userInfo, outToken, err := sspiAuth.Authenticate(ctx.Req.Request, ctx.Resp)
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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(ctx.Resp, 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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addFlashErr(ctx, ctx.Tr("auth.sspi_auth_failed"))
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ctx.Data["EnableOpenIDSignIn"] = setting.Service.EnableOpenIDSignIn
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ctx.Data["EnableSSPI"] = true
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ctx.HTML(401, string(tplSignIn))
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return nil
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}
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if outToken != "" {
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sspiAuth.AppendAuthenticateHeader(ctx.Resp, 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 := models.GetUserByName(username)
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if err != nil {
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if !models.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(ctx, 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 !isAPIPath(ctx) && !isAttachmentDownload(ctx) {
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handleSignIn(ctx, sess, user)
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}
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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() (*models.SSPIConfig, error) {
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sources, err := models.ActiveLoginSources(models.LoginSSPI)
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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].SSPI(), nil
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}
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func (s *SSPI) shouldAuthenticate(ctx *macaron.Context) (shouldAuth bool) {
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shouldAuth = false
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path := strings.TrimSuffix(ctx.Req.URL.Path, "/")
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if path == "/user/login" {
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if ctx.Req.FormValue("user_name") != "" && ctx.Req.FormValue("password") != "" {
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shouldAuth = false
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} else if ctx.Req.FormValue("auth_with_sspi") == "1" {
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shouldAuth = true
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}
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} else if isInternalPath(ctx) {
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shouldAuth = false
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} else if isAPIPath(ctx) || isAttachmentDownload(ctx) {
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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(ctx *macaron.Context, username string, cfg *models.SSPIConfig) (*models.User, error) {
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email := gouuid.New().String() + "@localhost.localdomain"
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user := &models.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: base.DefaultAvatarLink(),
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EmailNotificationsPreference: models.EmailNotificationsDisabled,
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}
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if err := models.CreateUser(user); err != nil {
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return nil, err
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}
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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 *models.SSPIConfig) 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 *models.SSPIConfig) 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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// addFlashErr adds an error message to the Flash object mapped to a macaron.Context
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func addFlashErr(ctx *macaron.Context, err string) {
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fv := ctx.GetVal(reflect.TypeOf(&session.Flash{}))
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if !fv.IsValid() {
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return
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}
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flash, ok := fv.Interface().(*session.Flash)
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if !ok {
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return
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}
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flash.Error(err)
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ctx.Data["Flash"] = flash
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}
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// init 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 init() {
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Register(&SSPI{})
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}
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