package ldap import ( "context" "errors" "fmt" "net" "net/http" "net/http/cookiejar" "net/url" "strconv" "strings" "time" goldap "github.com/go-ldap/ldap/v3" "github.com/nmcclain/ldap" "goauthentik.io/outpost/api" "goauthentik.io/outpost/pkg" "goauthentik.io/outpost/pkg/ak" ) const ContextUserKey = "ak_user" func (pi *ProviderInstance) getUsername(dn string) (string, error) { if !strings.HasSuffix(strings.ToLower(dn), strings.ToLower(pi.BaseDN)) { return "", errors.New("invalid base DN") } dns, err := goldap.ParseDN(dn) if err != nil { return "", err } for _, part := range dns.RDNs { for _, attribute := range part.Attributes { if strings.ToLower(attribute.Type) == "cn" { return attribute.Value, nil } } } return "", errors.New("failed to find cn") } func (pi *ProviderInstance) Bind(username string, bindDN, bindPW string, conn net.Conn) (ldap.LDAPResultCode, error) { jar, err := cookiejar.New(nil) if err != nil { pi.log.WithError(err).Warning("Failed to create cookiejar") return ldap.LDAPResultOperationsError, nil } host, _, err := net.SplitHostPort(conn.RemoteAddr().String()) if err != nil { pi.log.WithError(err).Warning("Failed to get remote IP") return ldap.LDAPResultOperationsError, nil } // Create new http client that also sets the correct ip config := api.NewConfiguration() // Carry over the bearer authentication, so that failed login attempts are attributed to the outpost config.DefaultHeader = pi.s.ac.Client.GetConfig().DefaultHeader config.Host = pi.s.ac.Client.GetConfig().Host config.Scheme = pi.s.ac.Client.GetConfig().Scheme config.HTTPClient = &http.Client{ Jar: jar, Transport: newTransport(ak.SetUserAgent(ak.GetTLSTransport(), pkg.UserAgent()), map[string]string{ "X-authentik-remote-ip": host, }), } // create the API client, with the transport apiClient := api.NewAPIClient(config) params := url.Values{} params.Add("goauthentik.io/outpost/ldap", "true") passed, err := pi.solveFlowChallenge(username, bindPW, apiClient, params.Encode(), 1) if err != nil { pi.log.WithField("bindDN", bindDN).WithError(err).Warning("failed to solve challenge") return ldap.LDAPResultOperationsError, nil } if !passed { return ldap.LDAPResultInvalidCredentials, nil } r, err := pi.s.ac.Client.CoreApi.CoreApplicationsCheckAccessRetrieve(context.Background(), pi.appSlug).Execute() if r.StatusCode == 403 { pi.log.WithField("bindDN", bindDN).Info("Access denied for user") return ldap.LDAPResultInsufficientAccessRights, nil } if err != nil { pi.log.WithField("bindDN", bindDN).WithError(err).Warning("failed to check access") return ldap.LDAPResultOperationsError, nil } pi.log.WithField("bindDN", bindDN).Info("User has access") // Get user info to store in context userInfo, _, err := pi.s.ac.Client.CoreApi.CoreUsersMeRetrieve(context.Background()).Execute() if err != nil { pi.log.WithField("bindDN", bindDN).WithError(err).Warning("failed to get user info") return ldap.LDAPResultOperationsError, nil } pi.boundUsersMutex.Lock() pi.boundUsers[bindDN] = UserFlags{ UserInfo: userInfo.User, CanSearch: pi.SearchAccessCheck(userInfo.User), } defer pi.boundUsersMutex.Unlock() pi.delayDeleteUserInfo(username) return ldap.LDAPResultSuccess, nil } // SearchAccessCheck Check if the current user is allowed to search func (pi *ProviderInstance) SearchAccessCheck(user api.User) bool { for _, group := range user.Groups { for _, allowedGroup := range pi.searchAllowedGroups { pi.log.WithField("userGroup", group.Pk).WithField("allowedGroup", allowedGroup).Trace("Checking search access") if group.Pk == allowedGroup.String() { pi.log.WithField("group", group.Name).Info("Allowed access to search") return true } } } return false } func (pi *ProviderInstance) delayDeleteUserInfo(dn string) { ticker := time.NewTicker(30 * time.Second) quit := make(chan struct{}) go func() { for { select { case <-ticker.C: pi.boundUsersMutex.Lock() delete(pi.boundUsers, dn) pi.boundUsersMutex.Unlock() close(quit) case <-quit: ticker.Stop() return } } }() } type ChallengeInt interface { GetComponent() string GetType() api.ChallengeChoices GetResponseErrors() map[string][]api.ErrorDetail } func (pi *ProviderInstance) solveFlowChallenge(bindDN string, password string, client *api.APIClient, urlParams string, depth int) (bool, error) { req := client.FlowsApi.FlowsExecutorGet(context.Background(), pi.flowSlug).Query(urlParams) challenge, _, err := req.Execute() if err != nil { pi.log.WithError(err).Warning("Failed to get challenge") return false, err } ch := challenge.GetActualInstance().(ChallengeInt) pi.log.WithField("component", ch.GetComponent()).WithField("type", ch.GetType()).Debug("Got challenge") responseReq := client.FlowsApi.FlowsExecutorSolve(context.Background(), pi.flowSlug).Query(urlParams) switch ch.GetComponent() { case "ak-stage-identification": responseReq.ChallengeResponseRequest(api.ChallengeResponseRequest{ IdentificationChallengeResponseRequest: &api.IdentificationChallengeResponseRequest{ UidField: bindDN, }, }) case "ak-stage-password": responseReq.ChallengeResponseRequest(api.ChallengeResponseRequest{ PasswordChallengeResponseRequest: &api.PasswordChallengeResponseRequest{ Password: password, }, }) case "ak-stage-authenticator-validate": // We only support duo as authenticator, check if that's allowed var deviceChallenge *api.DeviceChallenge for _, devCh := range challenge.AuthenticatorValidationChallenge.DeviceChallenges { if devCh.DeviceClass == string(api.DEVICECLASSESENUM_DUO) { deviceChallenge = &devCh } } if deviceChallenge == nil { return false, errors.New("got ak-stage-authenticator-validate without duo") } devId, err := strconv.Atoi(deviceChallenge.DeviceUid) if err != nil { return false, errors.New("failed to convert duo device id to int") } devId32 := int32(devId) responseReq.ChallengeResponseRequest(api.ChallengeResponseRequest{ AuthenticatorValidationChallengeResponseRequest: &api.AuthenticatorValidationChallengeResponseRequest{ Duo: &devId32, }, }) case "ak-stage-access-denied": return false, errors.New("got ak-stage-access-denied") default: return false, fmt.Errorf("unsupported challenge type: %s", ch.GetComponent()) } response, _, err := responseReq.Execute() ch = response.GetActualInstance().(ChallengeInt) pi.log.WithField("component", ch.GetComponent()).WithField("type", ch.GetType()).Debug("Got response") switch ch.GetComponent() { case "ak-stage-access-denied": return false, errors.New("got ak-stage-access-denied") } if ch.GetType() == "redirect" { return true, nil } if err != nil { pi.log.WithError(err).Warning("Failed to submit challenge") return false, err } if len(ch.GetResponseErrors()) > 0 { for key, errs := range ch.GetResponseErrors() { for _, err := range errs { pi.log.WithField("key", key).WithField("code", err.Code).Debug(err.String) return false, nil } } } if depth >= 10 { return false, errors.New("exceeded stage recursion depth") } return pi.solveFlowChallenge(bindDN, password, client, urlParams, depth+1) }