feat: Identity brokering (#730)

* feat: add/ remove external idps * feat: external idp add /remove * fix: auth proto * fix: handle login * feat: loginpolicy on authrequest * feat: idp providers on login * feat: link external idp * fix: check login policy on check username * feat: add mapping fields for idp config * feat: use user org id if existing * feat: use user org id if existing * feat: register external user * feat: register external user * feat: user linking * feat: user linking * feat: design external login * feat: design external login * fix: tests * fix: regenerate login design * feat: next step test linking process * feat: next step test linking process * feat: cascade remove external idps on user * fix: tests * fix: tests * feat: external idp requsts on users * fix: generate protos * feat: login styles * feat: login styles * fix: link user * fix: register user on specifig org * fix: user linking * fix: register external, linking auto * fix: remove unnecessary request from proto * fix: tests * fix: new oidc package * fix: migration version * fix: policy permissions * Update internal/ui/login/static/i18n/en.yaml Co-authored-by: Livio Amstutz <livio.a@gmail.com> * Update internal/ui/login/static/i18n/en.yaml Co-authored-by: Livio Amstutz <livio.a@gmail.com> * Update internal/ui/login/handler/renderer.go Co-authored-by: Livio Amstutz <livio.a@gmail.com> * Update internal/ui/login/handler/renderer.go Co-authored-by: Livio Amstutz <livio.a@gmail.com> * fix: pr requests * Update internal/ui/login/handler/link_users_handler.go Co-authored-by: Livio Amstutz <livio.a@gmail.com> * fix: pr requests * fix: pr requests * fix: pr requests * fix: login name size * fix: profile image light * fix: colors * fix: pr requests * fix: remove redirect uri validator * fix: remove redirect uri validator Co-authored-by: Livio Amstutz <livio.a@gmail.com>
2025-08-12 01:37:31 +00:00 · 2020-09-18 13:26:28 +02:00
parent 1d542a0c57
commit 320ddfa46d
141 changed files with 30057 additions and 12535 deletions
--- a/internal/user/model/external_idp.go
+++ b/internal/user/model/external_idp.go
@@ -0,0 +1,17 @@
+package model
+
+import (
+	es_models "github.com/caos/zitadel/internal/eventstore/models"
+)
+
+type ExternalIDP struct {
+	es_models.ObjectRoot
+
+	IDPConfigID string
+	UserID      string
+	DisplayName string
+}
+
+func (idp *ExternalIDP) IsValid() bool {
+	return idp.AggregateID != "" && idp.IDPConfigID != "" && idp.UserID != ""
+}
--- a/internal/user/model/external_idp_view.go
+++ b/internal/user/model/external_idp_view.go
@@ -0,0 +1,61 @@
+package model
+
+import (
+	"github.com/caos/zitadel/internal/model"
+	"time"
+)
+
+type ExternalIDPView struct {
+	UserID          string
+	IDPConfigID     string
+	ExternalUserID  string
+	IDPName         string
+	UserDisplayName string
+	CreationDate    time.Time
+	ChangeDate      time.Time
+	ResourceOwner   string
+	Sequence        uint64
+}
+
+type ExternalIDPSearchRequest struct {
+	Offset        uint64
+	Limit         uint64
+	SortingColumn ExternalIDPSearchKey
+	Asc           bool
+	Queries       []*ExternalIDPSearchQuery
+}
+
+type ExternalIDPSearchKey int32
+
+const (
+	ExternalIDPSearchKeyUnspecified ExternalIDPSearchKey = iota
+	ExternalIDPSearchKeyExternalUserID
+	ExternalIDPSearchKeyUserID
+	ExternalIDPSearchKeyIdpConfigID
+	ExternalIDPSearchKeyResourceOwner
+)
+
+type ExternalIDPSearchQuery struct {
+	Key    ExternalIDPSearchKey
+	Method model.SearchMethod
+	Value  interface{}
+}
+
+type ExternalIDPSearchResponse struct {
+	Offset      uint64
+	Limit       uint64
+	TotalResult uint64
+	Result      []*ExternalIDPView
+	Sequence    uint64
+	Timestamp   time.Time
+}
+
+func (r *ExternalIDPSearchRequest) EnsureLimit(limit uint64) {
+	if r.Limit == 0 || r.Limit > limit {
+		r.Limit = limit
+	}
+}
+
+func (r *ExternalIDPSearchRequest) AppendUserQuery(userID string) {
+	r.Queries = append(r.Queries, &ExternalIDPSearchQuery{Key: ExternalIDPSearchKeyUserID, Method: model.SearchMethodEquals, Value: userID})
+}
--- a/internal/user/model/user_human.go
+++ b/internal/user/model/user_human.go
@@ -15,6 +15,7 @@ type Human struct {
 	*Email
 	*Phone
 	*Address
+	ExternalIDPs []*ExternalIDP
 	InitCode     *InitUserCode
 	EmailCode    *EmailCode
 	PhoneCode    *PhoneCode
@@ -45,11 +46,11 @@ func (u *Human) SetNamesAsDisplayname() {
 }

 func (u *Human) IsValid() bool {
-	return u.Profile != nil && u.FirstName != "" && u.LastName != "" && u.Email != nil && u.Email.IsValid() && u.Phone == nil || (u.Phone != nil && u.Phone.IsValid())
+	return u.Profile != nil && u.FirstName != "" && u.LastName != "" && u.Email != nil && u.Email.IsValid() && u.Phone == nil || (u.Phone != nil && u.Phone.PhoneNumber != "" && u.Phone.IsValid())
 }

 func (u *Human) IsInitialState() bool {
-	return u.Email == nil || !u.IsEmailVerified || u.Password == nil || u.SecretString == ""
+	return u.Email == nil || !u.IsEmailVerified || (u.ExternalIDPs == nil || len(u.ExternalIDPs) == 0) && (u.Password == nil || u.SecretString == "")
 }

 func (u *Human) IsOTPReady() bool {
@@ -96,3 +97,12 @@ func (init *InitUserCode) GenerateInitUserCode(generator crypto.Generator) error
 	init.Expiry = generator.Expiry()
 	return nil
 }
+
+func (u *Human) GetExternalIDP(externalIDP *ExternalIDP) (int, *ExternalIDP) {
+	for i, idp := range u.ExternalIDPs {
+		if idp.UserID == externalIDP.UserID {
+			return i, idp
+		}
+	}
+	return -1, nil
+}
--- a/internal/user/repository/eventsourcing/eventstore.go
+++ b/internal/user/repository/eventsourcing/eventstore.go
@@ -190,16 +190,17 @@ func (es *UserEventstore) CreateUser(ctx context.Context, user *usr_model.User,
 	return model.UserToModel(repoUser), nil
 }

-func (es *UserEventstore) PrepareRegisterUser(ctx context.Context, user *usr_model.User, policy *policy_model.PasswordComplexityPolicy, orgIAMPolicy *org_model.OrgIAMPolicy, resourceOwner string) (*model.User, []*es_models.Aggregate, error) {
+func (es *UserEventstore) PrepareRegisterUser(ctx context.Context, user *usr_model.User, externalIDP *usr_model.ExternalIDP, policy *policy_model.PasswordComplexityPolicy, orgIAMPolicy *org_model.OrgIAMPolicy, resourceOwner string) (*model.User, []*es_models.Aggregate, error) {
 	if user.Human == nil {
 		return nil, nil, caos_errs.ThrowInvalidArgument(nil, "EVENT-ht8Ux", "Errors.User.Invalid")
 	}
+
 	err := user.CheckOrgIAMPolicy(orgIAMPolicy)
 	if err != nil {
 		return nil, nil, err
 	}
 	user.SetNamesAsDisplayname()
-	if !user.IsValid() || user.Password == nil || user.SecretString == "" {
+	if !user.IsValid() || externalIDP == nil && (user.Password == nil || user.SecretString == "") {
 		return nil, nil, caos_errs.ThrowPreconditionFailed(nil, "EVENT-9dk45", "Errors.User.Invalid")
 	}
 	id, err := es.idGenerator.Next()
@@ -207,7 +208,13 @@ func (es *UserEventstore) PrepareRegisterUser(ctx context.Context, user *usr_mod
 		return nil, nil, err
 	}
 	user.AggregateID = id
-
+	if externalIDP != nil {
+		externalIDP.AggregateID = id
+		if !externalIDP.IsValid() {
+			return nil, nil, errors.ThrowPreconditionFailed(nil, "EVENT-4Dj9s", "Errors.User.ExternalIDP.Invalid")
+		}
+		user.ExternalIDPs = append(user.ExternalIDPs, externalIDP)
+	}
 	err = user.HashPasswordIfExisting(policy, es.PasswordAlg, false)
 	if err != nil {
 		return nil, nil, err
@@ -218,14 +225,15 @@ func (es *UserEventstore) PrepareRegisterUser(ctx context.Context, user *usr_mod
 	}

 	repoUser := model.UserFromModel(user)
+	repoExternalIDP := model.ExternalIDPFromModel(externalIDP)
 	repoInitCode := model.InitCodeFromModel(user.InitCode)

-	aggregates, err := UserRegisterAggregate(ctx, es.AggregateCreator(), repoUser, resourceOwner, repoInitCode, orgIAMPolicy.UserLoginMustBeDomain)
+	aggregates, err := UserRegisterAggregate(ctx, es.AggregateCreator(), repoUser, repoExternalIDP, resourceOwner, repoInitCode, orgIAMPolicy.UserLoginMustBeDomain)
 	return repoUser, aggregates, err
 }

 func (es *UserEventstore) RegisterUser(ctx context.Context, user *usr_model.User, pwPolicy *policy_model.PasswordComplexityPolicy, orgIAMPolicy *org_model.OrgIAMPolicy, resourceOwner string) (*usr_model.User, error) {
-	repoUser, createAggregates, err := es.PrepareRegisterUser(ctx, user, pwPolicy, orgIAMPolicy, resourceOwner)
+	repoUser, createAggregates, err := es.PrepareRegisterUser(ctx, user, nil, pwPolicy, orgIAMPolicy, resourceOwner)
 	if err != nil {
 		return nil, err
 	}
@@ -691,6 +699,103 @@ func (es *UserEventstore) PasswordCodeSent(ctx context.Context, userID string) e
 	return nil
 }

+func (es *UserEventstore) AddExternalIDP(ctx context.Context, externalIDP *usr_model.ExternalIDP) (*usr_model.ExternalIDP, error) {
+	if externalIDP == nil || !externalIDP.IsValid() {
+		return nil, errors.ThrowPreconditionFailed(nil, "EVENT-Ek9s", "Errors.User.ExternalIDP.Invalid")
+	}
+	existingUser, err := es.UserByID(ctx, externalIDP.AggregateID)
+	if err != nil {
+		return nil, err
+	}
+	if existingUser.Human == nil {
+		return nil, errors.ThrowPreconditionFailed(nil, "EVENT-Cnk8s", "Errors.User.NotHuman")
+	}
+	repoUser := model.UserFromModel(existingUser)
+	repoExternalIDP := model.ExternalIDPFromModel(externalIDP)
+	aggregates, err := ExternalIDPAddedAggregate(ctx, es.Eventstore.AggregateCreator(), repoUser, repoExternalIDP)
+	if err != nil {
+		return nil, err
+	}
+	err = es_sdk.PushAggregates(ctx, es.PushAggregates, repoUser.AppendEvents, aggregates...)
+	if err != nil {
+		return nil, err
+	}
+
+	es.userCache.cacheUser(repoUser)
+	if _, idp := model.GetExternalIDP(repoUser.ExternalIDPs, externalIDP.UserID); idp != nil {
+		return model.ExternalIDPToModel(idp), nil
+	}
+	return nil, errors.ThrowInternal(nil, "EVENT-Msi9d", "Errors.Internal")
+}
+
+func (es *UserEventstore) BulkAddExternalIDPs(ctx context.Context, userID string, externalIDPs []*usr_model.ExternalIDP) error {
+	if externalIDPs == nil || len(externalIDPs) == 0 {
+		return errors.ThrowPreconditionFailed(nil, "EVENT-Ek9s", "Errors.User.ExternalIDP.MinimumExternalIDPNeeded")
+	}
+	for _, externalIDP := range externalIDPs {
+		if !externalIDP.IsValid() {
+			return caos_errs.ThrowPreconditionFailed(nil, "EVENT-idue3", "Errors.User.ExternalIDP.Invalid")
+		}
+	}
+	existingUser, err := es.UserByID(ctx, userID)
+	if err != nil {
+		return err
+	}
+	if existingUser.Human == nil {
+		return errors.ThrowPreconditionFailed(nil, "EVENT-Cnk8s", "Errors.User.NotHuman")
+	}
+	repoUser := model.UserFromModel(existingUser)
+	repoExternalIDPs := model.ExternalIDPsFromModel(externalIDPs)
+	aggregates, err := ExternalIDPAddedAggregate(ctx, es.Eventstore.AggregateCreator(), repoUser, repoExternalIDPs...)
+	if err != nil {
+		return err
+	}
+	err = es_sdk.PushAggregates(ctx, es.PushAggregates, repoUser.AppendEvents, aggregates...)
+	if err != nil {
+		return err
+	}
+
+	es.userCache.cacheUser(repoUser)
+	return nil
+}
+
+func (es *UserEventstore) PrepareRemoveExternalIDP(ctx context.Context, externalIDP *usr_model.ExternalIDP, cascade bool) (*model.User, []*es_models.Aggregate, error) {
+	if externalIDP == nil || !externalIDP.IsValid() {
+		return nil, nil, errors.ThrowPreconditionFailed(nil, "EVENT-Cm8sj", "Errors.User.ExternalIDP.Invalid")
+	}
+	existingUser, err := es.UserByID(ctx, externalIDP.AggregateID)
+	if err != nil {
+		return nil, nil, err
+	}
+	if existingUser.Human == nil {
+		return nil, nil, errors.ThrowPreconditionFailed(nil, "EVENT-E8iod", "Errors.User.NotHuman")
+	}
+	_, existingIDP := existingUser.GetExternalIDP(externalIDP)
+	if existingIDP == nil {
+		return nil, nil, errors.ThrowPreconditionFailed(nil, "EVENT-3Dh7s", "Errors.User.ExternalIDP.NotOnUser")
+	}
+	repoUser := model.UserFromModel(existingUser)
+	repoExternalIDP := model.ExternalIDPFromModel(externalIDP)
+	agg, err := ExternalIDPRemovedAggregate(ctx, es.Eventstore.AggregateCreator(), repoUser, repoExternalIDP, cascade)
+	if err != nil {
+		return nil, nil, err
+	}
+	return repoUser, agg, err
+}
+
+func (es *UserEventstore) RemoveExternalIDP(ctx context.Context, externalIDP *usr_model.ExternalIDP) error {
+	repoUser, aggregates, err := es.PrepareRemoveExternalIDP(ctx, externalIDP, false)
+	if err != nil {
+		return err
+	}
+	err = es_sdk.PushAggregates(ctx, es.PushAggregates, repoUser.AppendEvents, aggregates...)
+	if err != nil {
+		return err
+	}
+	es.userCache.cacheUser(repoUser)
+	return nil
+}
+
 func (es *UserEventstore) ProfileByID(ctx context.Context, userID string) (*usr_model.Profile, error) {
 	if userID == "" {
 		return nil, caos_errs.ThrowPreconditionFailed(nil, "EVENT-di834", "Errors.User.UserIDMissing")
--- a/internal/user/repository/eventsourcing/eventstore_mock_test.go
+++ b/internal/user/repository/eventsourcing/eventstore_mock_test.go
@@ -458,6 +458,30 @@ func GetMockManipulateUserWithOTP(ctrl *gomock.Controller, decrypt, verified boo
 	return es
 }

+func GetMockManipulateUserWithExternalIDP(ctrl *gomock.Controller) *UserEventstore {
+	user := model.Human{
+		Profile: &model.Profile{
+			DisplayName: "DisplayName",
+		},
+	}
+	externalIDP := model.ExternalIDP{
+		IDPConfigID: "IDPConfigID",
+		UserID:      "UserID",
+		DisplayName: "DisplayName",
+	}
+	dataUser, _ := json.Marshal(user)
+	dataIDP, _ := json.Marshal(externalIDP)
+	events := []*es_models.Event{
+		{AggregateID: "AggregateID", AggregateVersion: "v1", Sequence: 1, Type: model.UserAdded, Data: dataUser},
+		{AggregateID: "AggregateID", AggregateVersion: "v1", Sequence: 1, Type: model.HumanExternalIDPAdded, Data: dataIDP},
+	}
+	mockEs := mock.NewMockEventstore(ctrl)
+	mockEs.EXPECT().FilterEvents(gomock.Any(), gomock.Any()).Return(events, nil)
+	mockEs.EXPECT().AggregateCreator().Return(es_models.NewAggregateCreator("TEST"))
+	mockEs.EXPECT().PushAggregates(gomock.Any(), gomock.Any()).Return(nil)
+	return GetMockedEventstore(ctrl, mockEs)
+}
+
 func GetMockManipulateUserNoEvents(ctrl *gomock.Controller) *UserEventstore {
 	events := []*es_models.Event{}
 	mockEs := mock.NewMockEventstore(ctrl)
--- a/internal/user/repository/eventsourcing/eventstore_test.go
+++ b/internal/user/repository/eventsourcing/eventstore_test.go
@@ -1967,6 +1967,191 @@ func TestPasswordCodeSent(t *testing.T) {
 	}
 }

+func TestAddExternalIDP(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	type args struct {
+		es          *UserEventstore
+		ctx         context.Context
+		externalIDP *model.ExternalIDP
+	}
+	type res struct {
+		errFunc func(err error) bool
+	}
+	tests := []struct {
+		name string
+		args args
+		res  res
+	}{
+		{
+			name: "add ok",
+			args: args{
+				es:  GetMockManipulateUser(ctrl),
+				ctx: authz.NewMockContext("orgID", "userID"),
+				externalIDP: &model.ExternalIDP{
+					ObjectRoot: es_models.ObjectRoot{
+						AggregateID: "AggregateID",
+					},
+					IDPConfigID: "IDPConfigID",
+					UserID:      "UserID",
+					DisplayName: "DisplayName",
+				},
+			},
+		},
+		{
+			name: "invalid idp",
+			args: args{
+				es:  GetMockManipulateUser(ctrl),
+				ctx: authz.NewMockContext("orgID", "userID"),
+				externalIDP: &model.ExternalIDP{
+					ObjectRoot: es_models.ObjectRoot{
+						AggregateID: "AggregateID",
+					},
+					UserID:      "UserID",
+					DisplayName: "DisplayName",
+				},
+			},
+			res: res{
+				errFunc: caos_errs.IsPreconditionFailed,
+			},
+		},
+		{
+			name: "existing user not found",
+			args: args{
+				es:  GetMockManipulateUserNoEvents(ctrl),
+				ctx: authz.NewMockContext("orgID", "userID"),
+				externalIDP: &model.ExternalIDP{
+					ObjectRoot: es_models.ObjectRoot{
+						AggregateID: "AggregateID",
+					},
+					IDPConfigID: "IDPConfigID",
+					UserID:      "UserID",
+					DisplayName: "DisplayName",
+				},
+			},
+			res: res{
+				errFunc: caos_errs.IsNotFound,
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result, err := tt.args.es.AddExternalIDP(tt.args.ctx, tt.args.externalIDP)
+
+			if tt.res.errFunc == nil && result.AggregateID == "" {
+				t.Errorf("result has no id")
+			}
+			if tt.res.errFunc == nil && result.IDPConfigID == "" {
+				t.Errorf("result has no idpconfig")
+			}
+			if tt.res.errFunc == nil && result.UserID == "" {
+				t.Errorf("result has no UserID")
+			}
+			if tt.res.errFunc == nil && result == nil {
+				t.Errorf("got wrong result change required: actual: %v ", result)
+			}
+			if tt.res.errFunc != nil && !tt.res.errFunc(err) {
+				t.Errorf("got wrong err: %v ", err)
+			}
+		})
+	}
+}
+
+func TestRemoveExternalIDP(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	type args struct {
+		es          *UserEventstore
+		ctx         context.Context
+		externalIDP *model.ExternalIDP
+	}
+	type res struct {
+		errFunc func(err error) bool
+	}
+	tests := []struct {
+		name string
+		args args
+		res  res
+	}{
+		{
+			name: "remove ok",
+			args: args{
+				es:  GetMockManipulateUserWithExternalIDP(ctrl),
+				ctx: authz.NewMockContext("orgID", "userID"),
+				externalIDP: &model.ExternalIDP{
+					ObjectRoot: es_models.ObjectRoot{
+						AggregateID: "AggregateID",
+					},
+					IDPConfigID: "IDPConfigID",
+					UserID:      "UserID",
+				},
+			},
+		},
+		{
+			name: "invalid idp",
+			args: args{
+				es:  GetMockManipulateUser(ctrl),
+				ctx: authz.NewMockContext("orgID", "userID"),
+				externalIDP: &model.ExternalIDP{
+					ObjectRoot: es_models.ObjectRoot{
+						AggregateID: "AggregateID",
+					},
+					UserID:      "UserID",
+					DisplayName: "DisplayName",
+				},
+			},
+			res: res{
+				errFunc: caos_errs.IsPreconditionFailed,
+			},
+		},
+		{
+			name: "remove external idp not existing",
+			args: args{
+				es:  GetMockManipulateUser(ctrl),
+				ctx: authz.NewMockContext("orgID", "userID"),
+				externalIDP: &model.ExternalIDP{
+					ObjectRoot: es_models.ObjectRoot{
+						AggregateID: "AggregateID",
+					},
+					IDPConfigID: "IDPConfigID",
+					UserID:      "UserID",
+				},
+			},
+			res: res{
+				errFunc: caos_errs.IsPreconditionFailed,
+			},
+		},
+		{
+			name: "existing user not found",
+			args: args{
+				es:  GetMockManipulateUserNoEvents(ctrl),
+				ctx: authz.NewMockContext("orgID", "userID"),
+				externalIDP: &model.ExternalIDP{
+					ObjectRoot: es_models.ObjectRoot{
+						AggregateID: "AggregateID",
+					},
+					IDPConfigID: "IDPConfigID",
+					UserID:      "UserID",
+					DisplayName: "DisplayName",
+				},
+			},
+			res: res{
+				errFunc: caos_errs.IsNotFound,
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := tt.args.es.RemoveExternalIDP(tt.args.ctx, tt.args.externalIDP)
+
+			if tt.res.errFunc == nil && err != nil {
+				t.Errorf("should not get err, %v", err)
+			}
+			if tt.res.errFunc != nil && !tt.res.errFunc(err) {
+				t.Errorf("got wrong err: %v ", err)
+			}
+		})
+	}
+}
+
 func TestProfileByID(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	type args struct {
--- a/internal/user/repository/eventsourcing/model/external_idp.go
+++ b/internal/user/repository/eventsourcing/model/external_idp.go
@@ -0,0 +1,96 @@
+package model
+
+import (
+	"encoding/json"
+	"github.com/caos/logging"
+	caos_errs "github.com/caos/zitadel/internal/errors"
+	es_models "github.com/caos/zitadel/internal/eventstore/models"
+	"github.com/caos/zitadel/internal/user/model"
+)
+
+type ExternalIDP struct {
+	es_models.ObjectRoot
+
+	IDPConfigID string `json:"idpConfigId,omitempty"`
+	UserID      string `json:"userId,omitempty"`
+	DisplayName string `json:"displayName,omitempty"`
+}
+
+func GetExternalIDP(idps []*ExternalIDP, id string) (int, *ExternalIDP) {
+	for i, idp := range idps {
+		if idp.UserID == id {
+			return i, idp
+		}
+	}
+	return -1, nil
+}
+
+func ExternalIDPsToModel(externalIDPs []*ExternalIDP) []*model.ExternalIDP {
+	convertedIDPs := make([]*model.ExternalIDP, len(externalIDPs))
+	for i, m := range externalIDPs {
+		convertedIDPs[i] = ExternalIDPToModel(m)
+	}
+	return convertedIDPs
+}
+
+func ExternalIDPsFromModel(externalIDPs []*model.ExternalIDP) []*ExternalIDP {
+	convertedIDPs := make([]*ExternalIDP, len(externalIDPs))
+	for i, m := range externalIDPs {
+		convertedIDPs[i] = ExternalIDPFromModel(m)
+	}
+	return convertedIDPs
+}
+
+func ExternalIDPFromModel(idp *model.ExternalIDP) *ExternalIDP {
+	if idp == nil {
+		return nil
+	}
+	return &ExternalIDP{
+		ObjectRoot:  idp.ObjectRoot,
+		IDPConfigID: idp.IDPConfigID,
+		UserID:      idp.UserID,
+		DisplayName: idp.DisplayName,
+	}
+}
+
+func ExternalIDPToModel(idp *ExternalIDP) *model.ExternalIDP {
+	return &model.ExternalIDP{
+		ObjectRoot:  idp.ObjectRoot,
+		IDPConfigID: idp.IDPConfigID,
+		UserID:      idp.UserID,
+	}
+}
+
+func (u *Human) appendExternalIDPAddedEvent(event *es_models.Event) error {
+	idp := new(ExternalIDP)
+	err := idp.setData(event)
+	if err != nil {
+		return err
+	}
+	idp.ObjectRoot.CreationDate = event.CreationDate
+	u.ExternalIDPs = append(u.ExternalIDPs, idp)
+	return nil
+}
+
+func (u *Human) appendExternalIDPRemovedEvent(event *es_models.Event) error {
+	idp := new(ExternalIDP)
+	err := idp.setData(event)
+	if err != nil {
+		return err
+	}
+	if i, externalIdp := GetExternalIDP(u.ExternalIDPs, idp.UserID); externalIdp != nil {
+		u.ExternalIDPs[i] = u.ExternalIDPs[len(u.ExternalIDPs)-1]
+		u.ExternalIDPs[len(u.ExternalIDPs)-1] = nil
+		u.ExternalIDPs = u.ExternalIDPs[:len(u.ExternalIDPs)-1]
+	}
+	return nil
+}
+
+func (pw *ExternalIDP) setData(event *es_models.Event) error {
+	pw.ObjectRoot.AppendEvent(event)
+	if err := json.Unmarshal(event.Data, pw); err != nil {
+		logging.Log("EVEN-Msi9d").WithError(err).Error("could not unmarshal event data")
+		return caos_errs.ThrowInternal(err, "MODEL-A9osf", "could not unmarshal event")
+	}
+	return nil
+}
--- a/internal/user/repository/eventsourcing/model/external_idp_test.go
+++ b/internal/user/repository/eventsourcing/model/external_idp_test.go
@@ -0,0 +1,89 @@
+package model
+
+import (
+	"encoding/json"
+	es_models "github.com/caos/zitadel/internal/eventstore/models"
+	"testing"
+)
+
+func TestAppendExternalIDPAddedEvent(t *testing.T) {
+	type args struct {
+		user        *Human
+		externalIDP *ExternalIDP
+		event       *es_models.Event
+	}
+	tests := []struct {
+		name   string
+		args   args
+		result *Human
+	}{
+		{
+			name: "append external idp added event",
+			args: args{
+				user:        &Human{},
+				externalIDP: &ExternalIDP{IDPConfigID: "IDPConfigID", UserID: "UserID", DisplayName: "DisplayName"},
+				event:       &es_models.Event{},
+			},
+			result: &Human{ExternalIDPs: []*ExternalIDP{{IDPConfigID: "IDPConfigID", UserID: "UserID", DisplayName: "DisplayName"}}},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.args.externalIDP != nil {
+				data, _ := json.Marshal(tt.args.externalIDP)
+				tt.args.event.Data = data
+			}
+			tt.args.user.appendExternalIDPAddedEvent(tt.args.event)
+			if len(tt.args.user.ExternalIDPs) == 0 {
+				t.Error("got wrong result expected external idps on user ")
+			}
+			if tt.args.user.ExternalIDPs[0].UserID != tt.result.ExternalIDPs[0].UserID {
+				t.Errorf("got wrong result: expected: %v, actual: %v ", tt.result.ExternalIDPs[0].UserID, tt.args.user.ExternalIDPs[0].UserID)
+			}
+			if tt.args.user.ExternalIDPs[0].IDPConfigID != tt.result.ExternalIDPs[0].IDPConfigID {
+				t.Errorf("got wrong result: expected: %v, actual: %v ", tt.result.ExternalIDPs[0].IDPConfigID, tt.args.user.ExternalIDPs[0].IDPConfigID)
+			}
+			if tt.args.user.ExternalIDPs[0].DisplayName != tt.result.ExternalIDPs[0].DisplayName {
+				t.Errorf("got wrong result: expected: %v, actual: %v ", tt.result.ExternalIDPs[0].DisplayName, tt.args.user.ExternalIDPs[0].IDPConfigID)
+			}
+		})
+	}
+}
+
+func TestAppendExternalIDPRemovedEvent(t *testing.T) {
+	type args struct {
+		user        *Human
+		externalIDP *ExternalIDP
+		event       *es_models.Event
+	}
+	tests := []struct {
+		name   string
+		args   args
+		result *Human
+	}{
+		{
+			name: "append external idp removed event",
+			args: args{
+				user: &Human{
+					ExternalIDPs: []*ExternalIDP{
+						{IDPConfigID: "IDPConfigID", UserID: "UserID", DisplayName: "DisplayName"},
+					}},
+				externalIDP: &ExternalIDP{UserID: "UserID"},
+				event:       &es_models.Event{},
+			},
+			result: &Human{},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.args.externalIDP != nil {
+				data, _ := json.Marshal(tt.args.externalIDP)
+				tt.args.event.Data = data
+			}
+			tt.args.user.appendExternalIDPRemovedEvent(tt.args.event)
+			if len(tt.args.user.ExternalIDPs) != 0 {
+				t.Error("got wrong result expected 0 external idps on user ")
+			}
+		})
+	}
+}
--- a/internal/user/repository/eventsourcing/model/types.go
+++ b/internal/user/repository/eventsourcing/model/types.go
@@ -4,8 +4,9 @@ import "github.com/caos/zitadel/internal/eventstore/models"

 //aggregates
 const (
-	UserAggregate         models.AggregateType = "user"
-	UserUserNameAggregate models.AggregateType = "user.username"
+	UserAggregate            models.AggregateType = "user"
+	UserUserNameAggregate    models.AggregateType = "user.username"
+	UserExternalIDPAggregate models.AggregateType = "user.human.externalidp"
 )

 // the following consts are for user v1 events
@@ -83,6 +84,13 @@ const (
 	HumanPasswordCheckSucceeded models.EventType = "user.human.password.check.succeeded"
 	HumanPasswordCheckFailed    models.EventType = "user.human.password.check.failed"

+	HumanExternalIDPReserved models.EventType = "user.human.externalidp.reserved"
+	HumanExternalIDPReleased models.EventType = "user.human.externalidp.released"
+
+	HumanExternalIDPAdded          models.EventType = "user.human.externalidp.added"
+	HumanExternalIDPRemoved        models.EventType = "user.human.externalidp.removed"
+	HumanExternalIDPCascadeRemoved models.EventType = "user.human.externalidp.cascade.removed"
+
 	HumanEmailChanged            models.EventType = "user.human.email.changed"
 	HumanEmailVerified           models.EventType = "user.human.email.verified"
 	HumanEmailVerificationFailed models.EventType = "user.human.email.verification.failed"
--- a/internal/user/repository/eventsourcing/model/user_human.go
+++ b/internal/user/repository/eventsourcing/model/user_human.go
@@ -19,11 +19,12 @@ type Human struct {
 	*Email
 	*Phone
 	*Address
-	InitCode     *InitUserCode `json:"-"`
-	EmailCode    *EmailCode    `json:"-"`
-	PhoneCode    *PhoneCode    `json:"-"`
-	PasswordCode *PasswordCode `json:"-"`
-	OTP          *OTP          `json:"-"`
+	ExternalIDPs []*ExternalIDP `json:"-"`
+	InitCode     *InitUserCode  `json:"-"`
+	EmailCode    *EmailCode     `json:"-"`
+	PhoneCode    *PhoneCode     `json:"-"`
+	PasswordCode *PasswordCode  `json:"-"`
+	OTP          *OTP           `json:"-"`
 }

 type InitUserCode struct {
@@ -52,6 +53,9 @@ func HumanFromModel(user *model.Human) *Human {
 	if user.OTP != nil {
 		human.OTP = OTPFromModel(user.OTP)
 	}
+	if user.ExternalIDPs != nil {
+		human.ExternalIDPs = ExternalIDPsFromModel(user.ExternalIDPs)
+	}
 	return human
 }

@@ -72,6 +76,9 @@ func HumanToModel(user *Human) *model.Human {
 	if user.Address != nil {
 		human.Address = AddressToModel(user.Address)
 	}
+	if user.ExternalIDPs != nil {
+		human.ExternalIDPs = ExternalIDPsToModel(user.ExternalIDPs)
+	}
 	if user.InitCode != nil {
 		human.InitCode = InitCodeToModel(user.InitCode)
 	}
@@ -169,6 +176,10 @@ func (h *Human) AppendEvent(event *es_models.Event) (err error) {
 	case MFAOTPRemoved,
 		HumanMFAOTPRemoved:
 		h.appendOTPRemovedEvent()
+	case HumanExternalIDPAdded:
+		err = h.appendExternalIDPAddedEvent(event)
+	case HumanExternalIDPRemoved, HumanExternalIDPCascadeRemoved:
+		err = h.appendExternalIDPRemovedEvent(event)
 	}
 	if err != nil {
 		return err
--- a/internal/user/repository/eventsourcing/user.go
+++ b/internal/user/repository/eventsourcing/user.go
@@ -2,9 +2,10 @@ package eventsourcing

 import (
 	"context"
+	"github.com/caos/zitadel/internal/api/authz"
+	iam_es_model "github.com/caos/zitadel/internal/iam/repository/eventsourcing/model"
 	"strings"

-	"github.com/caos/zitadel/internal/api/authz"
 	"github.com/caos/zitadel/internal/errors"
 	es_models "github.com/caos/zitadel/internal/eventstore/models"
 	es_sdk "github.com/caos/zitadel/internal/eventstore/sdk"
@@ -34,6 +35,14 @@ func UserUserNameUniqueQuery(userName string) *es_models.SearchQuery {
 		SetLimit(1)
 }

+func UserExternalIDPUniqueQuery(externalIDPUserID string) *es_models.SearchQuery {
+	return es_models.NewSearchQuery().
+		AggregateTypeFilter(model.UserExternalIDPAggregate).
+		AggregateIDFilter(externalIDPUserID).
+		OrderDesc().
+		SetLimit(1)
+}
+
 func UserAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, user *model.User) (*es_models.Aggregate, error) {
 	if user == nil {
 		return nil, errors.ThrowPreconditionFailed(nil, "EVENT-dis83", "Errors.Internal")
@@ -148,8 +157,8 @@ func HumanCreateAggregate(ctx context.Context, aggCreator *es_models.AggregateCr
 	return append(uniqueAggregates, agg), nil
 }

-func UserRegisterAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, user *model.User, resourceOwner string, initCode *model.InitUserCode, userLoginMustBeDomain bool) ([]*es_models.Aggregate, error) {
-	if user == nil || resourceOwner == "" || initCode == nil {
+func UserRegisterAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, user *model.User, externalIDP *model.ExternalIDP, resourceOwner string, initCode *model.InitUserCode, userLoginMustBeDomain bool) ([]*es_models.Aggregate, error) {
+	if user == nil || resourceOwner == "" {
 		return nil, errors.ThrowPreconditionFailed(nil, "EVENT-duxk2", "user, resourceowner, initcode must be set")
 	}

@@ -157,32 +166,62 @@ func UserRegisterAggregate(ctx context.Context, aggCreator *es_models.AggregateC
 		return nil, errors.ThrowPreconditionFailed(nil, "EVENT-ekuEA", "user must be type human")
 	}

+	aggregates := make([]*es_models.Aggregate, 0)
 	agg, err := UserAggregateOverwriteContext(ctx, aggCreator, user, resourceOwner, user.AggregateID)
 	if err != nil {
 		return nil, err
 	}

-	if !userLoginMustBeDomain {
-		validationQuery := es_models.NewSearchQuery().
-			AggregateTypeFilter(org_es_model.OrgAggregate).
-			AggregateIDsFilter()
-
-		validation := addUserNameValidation(user.UserName)
-		agg.SetPrecondition(validationQuery, validation)
-	}
 	agg, err = agg.AppendEvent(model.HumanRegistered, user)
 	if err != nil {
 		return nil, err
 	}
-	agg, err = agg.AppendEvent(model.InitializedHumanCodeAdded, initCode)
-	if err != nil {
-		return nil, err
+	if initCode != nil {
+		agg, err = agg.AppendEvent(model.InitializedHumanCodeAdded, initCode)
+		if err != nil {
+			return nil, err
+		}
 	}
+	if user.Email != nil && user.EmailAddress != "" && user.IsEmailVerified {
+		agg, err = agg.AppendEvent(model.HumanEmailVerified, nil)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if externalIDP != nil {
+		validationQuery := es_models.NewSearchQuery().
+			AggregateTypeFilter(org_es_model.OrgAggregate, iam_es_model.IAMAggregate).
+			AggregateIDsFilter()
+
+		if !userLoginMustBeDomain {
+			validation := addUserNameAndIDPConfigExistingValidation(user.UserName, externalIDP)
+			agg.SetPrecondition(validationQuery, validation)
+		} else {
+			validation := addIDPConfigExistingValidation(externalIDP)
+			agg.SetPrecondition(validationQuery, validation)
+		}
+
+		agg, err = agg.AppendEvent(model.HumanExternalIDPAdded, externalIDP)
+		uniqueExternalIDPAggregate, err := reservedUniqueExternalIDPAggregate(ctx, aggCreator, resourceOwner, externalIDP)
+		if err != nil {
+			return nil, err
+		}
+		aggregates = append(aggregates, uniqueExternalIDPAggregate)
+	} else if !userLoginMustBeDomain {
+		validationQuery := es_models.NewSearchQuery().
+			AggregateTypeFilter(org_es_model.OrgAggregate).
+			AggregateIDsFilter()
+		validation := addUserNameValidation(user.UserName)
+		agg.SetPrecondition(validationQuery, validation)
+	}
+
 	uniqueAggregates, err := getUniqueUserAggregates(ctx, aggCreator, user.UserName, user.EmailAddress, resourceOwner, userLoginMustBeDomain)
 	if err != nil {
 		return nil, err
 	}
-	return append(uniqueAggregates, agg), nil
+	aggregates = append(aggregates, uniqueAggregates...)
+	return append(aggregates, agg), nil
 }

 func getUniqueUserAggregates(ctx context.Context, aggCreator *es_models.AggregateCreator, userName, emailAddress, resourceOwner string, userLoginMustBeDomain bool) ([]*es_models.Aggregate, error) {
@@ -726,6 +765,86 @@ func DomainClaimedSentAggregate(aggCreator *es_models.AggregateCreator, user *mo
 	}
 }

+func ExternalIDPAddedAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, user *model.User, externalIDPs ...*model.ExternalIDP) ([]*es_models.Aggregate, error) {
+	if externalIDPs == nil {
+		return nil, errors.ThrowPreconditionFailed(nil, "EVENT-Di9os", "Errors.Internal")
+	}
+	aggregates := make([]*es_models.Aggregate, 0)
+	agg, err := UserAggregate(ctx, aggCreator, user)
+	if err != nil {
+		return nil, err
+	}
+	validationQuery := es_models.NewSearchQuery().
+		AggregateTypeFilter(org_es_model.OrgAggregate, iam_es_model.IAMAggregate).
+		AggregateIDsFilter()
+
+	validation := addIDPConfigExistingValidation(externalIDPs...)
+	agg.SetPrecondition(validationQuery, validation)
+	for _, externalIDP := range externalIDPs {
+		agg, err = agg.AppendEvent(model.HumanExternalIDPAdded, externalIDP)
+		uniqueAggregate, err := reservedUniqueExternalIDPAggregate(ctx, aggCreator, "", externalIDP)
+		if err != nil {
+			return nil, err
+		}
+		aggregates = append(aggregates, uniqueAggregate)
+	}
+	return append(aggregates, agg), nil
+}
+
+func ExternalIDPRemovedAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, user *model.User, externalIDP *model.ExternalIDP, cascade bool) ([]*es_models.Aggregate, error) {
+	if externalIDP == nil {
+		return nil, errors.ThrowPreconditionFailed(nil, "EVENT-Mlo0s", "Errors.Internal")
+	}
+
+	aggregates := make([]*es_models.Aggregate, 0)
+	agg, err := UserAggregate(ctx, aggCreator, user)
+	if err != nil {
+		return nil, err
+	}
+	if cascade {
+		agg, err = agg.AppendEvent(model.HumanExternalIDPCascadeRemoved, externalIDP)
+	} else {
+		agg, err = agg.AppendEvent(model.HumanExternalIDPRemoved, externalIDP)
+	}
+	uniqueReleasedAggregate, err := releasedUniqueExternalIDPAggregate(ctx, aggCreator, externalIDP)
+	if err != nil {
+		return nil, err
+	}
+	aggregates = append(aggregates, uniqueReleasedAggregate)
+	return append(aggregates, agg), nil
+}
+
+func reservedUniqueExternalIDPAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, resourceOwner string, externalIDP *model.ExternalIDP) (*es_models.Aggregate, error) {
+	uniqueExternlIDP := externalIDP.IDPConfigID + externalIDP.UserID
+	aggregate, err := aggCreator.NewAggregate(ctx, uniqueExternlIDP, model.UserExternalIDPAggregate, model.UserVersion, 0)
+	if resourceOwner != "" {
+		aggregate, err = aggCreator.NewAggregate(ctx, uniqueExternlIDP, model.UserExternalIDPAggregate, model.UserVersion, 0, es_models.OverwriteResourceOwner(resourceOwner))
+	}
+	if err != nil {
+		return nil, err
+	}
+	aggregate, err = aggregate.AppendEvent(model.HumanExternalIDPReserved, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return aggregate.SetPrecondition(UserExternalIDPUniqueQuery(uniqueExternlIDP), isEventValidation(aggregate, model.HumanExternalIDPReserved)), nil
+}
+
+func releasedUniqueExternalIDPAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, externalIDP *model.ExternalIDP) (aggregate *es_models.Aggregate, err error) {
+	uniqueExternlIDP := externalIDP.IDPConfigID + externalIDP.UserID
+	aggregate, err = aggCreator.NewAggregate(ctx, uniqueExternlIDP, model.UserExternalIDPAggregate, model.UserVersion, 0)
+	if err != nil {
+		return nil, err
+	}
+	aggregate, err = aggregate.AppendEvent(model.HumanExternalIDPReleased, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return aggregate.SetPrecondition(UserExternalIDPUniqueQuery(uniqueExternlIDP), isEventValidation(aggregate, model.HumanExternalIDPReleased)), nil
+}
+
 func UsernameChangedAggregates(ctx context.Context, aggCreator *es_models.AggregateCreator, user *model.User, oldUsername string, userLoginMustBeDomain bool) ([]*es_models.Aggregate, error) {
 	aggregates, err := changeUniqueUserNameAggregate(ctx, aggCreator, user.ResourceOwner, oldUsername, user.UserName, userLoginMustBeDomain)
 	if err != nil {
@@ -768,41 +887,178 @@ func addUserNameValidation(userName string) func(...*es_models.Event) error {
 	return func(events ...*es_models.Event) error {
 		domains := make([]*org_es_model.OrgDomain, 0)
 		for _, event := range events {
-			switch event.Type {
-			case org_es_model.OrgDomainAdded:
-				domain := new(org_es_model.OrgDomain)
-				domain.SetData(event)
-				domains = append(domains, domain)
-			case org_es_model.OrgDomainVerified:
-				domain := new(org_es_model.OrgDomain)
-				domain.SetData(event)
-				for _, d := range domains {
-					if d.Domain == domain.Domain {
-						d.Verified = true
-					}
-				}
-			case org_es_model.OrgDomainRemoved:
-				domain := new(org_es_model.OrgDomain)
-				domain.SetData(event)
-				for i, d := range domains {
-					if d.Domain == domain.Domain {
-						domains[i] = domains[len(domains)-1]
-						domains[len(domains)-1] = nil
-						domains = domains[:len(domains)-1]
-						break
-					}
-				}
-			}
+			domains = handleDomainEvents(domains, event)
+		}
+		return handleCheckDomainAllowedAsUsername(domains, userName)
+	}
+}
+
+func handleDomainEvents(domains []*org_es_model.OrgDomain, event *es_models.Event) []*org_es_model.OrgDomain {
+	switch event.Type {
+	case org_es_model.OrgDomainAdded:
+		domain := new(org_es_model.OrgDomain)
+		domain.SetData(event)
+		domains = append(domains, domain)
+	case org_es_model.OrgDomainVerified:
+		domain := new(org_es_model.OrgDomain)
+		domain.SetData(event)
+		for _, d := range domains {
+			if d.Domain == domain.Domain {
+				d.Verified = true
+			}
+		}
+	case org_es_model.OrgDomainRemoved:
+		domain := new(org_es_model.OrgDomain)
+		domain.SetData(event)
+		for i, d := range domains {
+			if d.Domain == domain.Domain {
+				domains[i] = domains[len(domains)-1]
+				domains[len(domains)-1] = nil
+				domains = domains[:len(domains)-1]
+				break
+			}
+		}
+	}
+	return domains
+}
+
+func handleCheckDomainAllowedAsUsername(domains []*org_es_model.OrgDomain, userName string) error {
+	split := strings.Split(userName, "@")
+	if len(split) != 2 {
+		return nil
+	}
+	for _, d := range domains {
+		if d.Verified && d.Domain == split[1] {
+			return errors.ThrowPreconditionFailed(nil, "EVENT-us5Zw", "Errors.User.DomainNotAllowedAsUsername")
+		}
+	}
+	return nil
+}
+
+func addIDPConfigExistingValidation(externalIDPs ...*model.ExternalIDP) func(...*es_models.Event) error {
+	return func(events ...*es_models.Event) error {
+		iamLoginPolicy := new(iam_es_model.LoginPolicy)
+		orgPolicyExisting := false
+		orgLoginPolicy := new(iam_es_model.LoginPolicy)
+		for _, event := range events {
+			switch event.AggregateType {
+			case org_es_model.OrgAggregate:
+				orgPolicyExisting = handleOrgLoginPolicy(event, orgPolicyExisting, orgLoginPolicy)
+			case iam_es_model.IAMAggregate:
+				handleIAMLoginPolicy(event, iamLoginPolicy)
+			}
+		}
+		return handleIDPConfigExisting(iamLoginPolicy, orgLoginPolicy, orgPolicyExisting, externalIDPs...)
+	}
+}
+
+func handleIDPConfigExisting(iamLoginPolicy, orgLoginPolicy *iam_es_model.LoginPolicy, orgPolicyExisting bool, externalIDPs ...*model.ExternalIDP) error {
+	if orgPolicyExisting {
+		if !orgLoginPolicy.AllowExternalIdp {
+			return errors.ThrowPreconditionFailed(nil, "EVENT-Wmi9s", "Errors.User.ExternalIDP.NotAllowed")
+		}
+		for _, externalIDP := range externalIDPs {
+			existing := false
+			for _, provider := range orgLoginPolicy.IDPProviders {
+				if provider.IDPConfigID == externalIDP.IDPConfigID {
+					existing = true
+					break
+				}
+			}
+			if !existing {
+				return errors.ThrowPreconditionFailed(nil, "EVENT-Ms9it", "Errors.User.ExternalIDP.IDPConfigNotExisting")
+			}
+		}
+	}
+	if !iamLoginPolicy.AllowExternalIdp {
+		return errors.ThrowPreconditionFailed(nil, "EVENT-Ns7uf", "Errors.User.ExternalIDP.NotAllowed")
+	}
+	for _, externalIDP := range externalIDPs {
+		existing := false
+		for _, provider := range iamLoginPolicy.IDPProviders {
+			if provider.IDPConfigID == externalIDP.IDPConfigID {
+				existing = true
+				break
+			}
+		}
+		if !existing {
+			return errors.ThrowPreconditionFailed(nil, "EVENT-Ms9it", "Errors.User.ExternalIDP.IDPConfigNotExisting")
+		}
+	}
+	return nil
+}
+
+func addUserNameAndIDPConfigExistingValidation(userName string, externalIDP *model.ExternalIDP) func(...*es_models.Event) error {
+	return func(events ...*es_models.Event) error {
+		domains := make([]*org_es_model.OrgDomain, 0)
+		iamLoginPolicy := new(iam_es_model.LoginPolicy)
+		orgPolicyExisting := false
+		orgLoginPolicy := new(iam_es_model.LoginPolicy)
+
+		for _, event := range events {
+			domains = handleDomainEvents(domains, event)
+
+			switch event.AggregateType {
+			case org_es_model.OrgAggregate:
+				orgPolicyExisting = handleOrgLoginPolicy(event, orgPolicyExisting, orgLoginPolicy)
+			case iam_es_model.IAMAggregate:
+				handleIAMLoginPolicy(event, iamLoginPolicy)
+			}
+		}
+		err := handleCheckDomainAllowedAsUsername(domains, userName)
+		if err != nil {
+			return err
+		}
+		return handleIDPConfigExisting(iamLoginPolicy, orgLoginPolicy, orgPolicyExisting, externalIDP)
+	}
+}
+
+func handleOrgLoginPolicy(event *es_models.Event, orgPolicyExisting bool, orgLoginPolicy *iam_es_model.LoginPolicy) bool {
+	switch event.Type {
+	case org_es_model.LoginPolicyAdded:
+		orgPolicyExisting = true
+		orgLoginPolicy.SetData(event)
+	case org_es_model.LoginPolicyChanged:
+		orgLoginPolicy.SetData(event)
+	case org_es_model.LoginPolicyRemoved:
+		orgPolicyExisting = false
+	case org_es_model.LoginPolicyIDPProviderAdded:
+		idp := new(iam_es_model.IDPProvider)
+		idp.SetData(event)
+		orgLoginPolicy.IDPProviders = append(orgLoginPolicy.IDPProviders, idp)
+	case org_es_model.LoginPolicyIDPProviderRemoved, org_es_model.LoginPolicyIDPProviderCascadeRemoved:
+		idp := new(iam_es_model.IDPProvider)
+		idp.SetData(event)
+		for i, provider := range orgLoginPolicy.IDPProviders {
+			if provider.IDPConfigID == idp.IDPConfigID {
+				orgLoginPolicy.IDPProviders[i] = orgLoginPolicy.IDPProviders[len(orgLoginPolicy.IDPProviders)-1]
+				orgLoginPolicy.IDPProviders[len(orgLoginPolicy.IDPProviders)-1] = nil
+				orgLoginPolicy.IDPProviders = orgLoginPolicy.IDPProviders[:len(orgLoginPolicy.IDPProviders)-1]
+				break
+			}
+		}
+	}
+	return orgPolicyExisting
+}
+
+func handleIAMLoginPolicy(event *es_models.Event, iamLoginPolicy *iam_es_model.LoginPolicy) {
+	switch event.Type {
+	case iam_es_model.LoginPolicyAdded, iam_es_model.LoginPolicyChanged:
+		iamLoginPolicy.SetData(event)
+	case iam_es_model.LoginPolicyIDPProviderAdded:
+		idp := new(iam_es_model.IDPProvider)
+		idp.SetData(event)
+		iamLoginPolicy.IDPProviders = append(iamLoginPolicy.IDPProviders, idp)
+	case iam_es_model.LoginPolicyIDPProviderRemoved, iam_es_model.LoginPolicyIDPProviderCascadeRemoved:
+		idp := new(iam_es_model.IDPProvider)
+		idp.SetData(event)
+		for i, provider := range iamLoginPolicy.IDPProviders {
+			if provider.IDPConfigID == idp.IDPConfigID {
+				iamLoginPolicy.IDPProviders[i] = iamLoginPolicy.IDPProviders[len(iamLoginPolicy.IDPProviders)-1]
+				iamLoginPolicy.IDPProviders[len(iamLoginPolicy.IDPProviders)-1] = nil
+				iamLoginPolicy.IDPProviders = iamLoginPolicy.IDPProviders[:len(iamLoginPolicy.IDPProviders)-1]
+				break
+			}
 		}
-		split := strings.Split(userName, "@")
-		if len(split) != 2 {
-			return nil
-		}
-		for _, d := range domains {
-			if d.Verified && d.Domain == split[1] {
-				return errors.ThrowPreconditionFailed(nil, "EVENT-us5Zw", "Errors.User.DomainNotAllowedAsUsername")
-			}
-		}
-		return nil
 	}
 }
--- a/internal/user/repository/eventsourcing/user_test.go
+++ b/internal/user/repository/eventsourcing/user_test.go
@@ -358,6 +358,7 @@ func TestUserRegisterAggregate(t *testing.T) {
 	type args struct {
 		ctx           context.Context
 		user          *model.User
+		externalIDP   *model.ExternalIDP
 		initCode      *model.InitUserCode
 		resourceOwner string
 		aggCreator    *models.AggregateCreator
@@ -365,6 +366,7 @@ func TestUserRegisterAggregate(t *testing.T) {
 	type res struct {
 		eventLen   int
 		eventTypes []models.EventType
+		aggLen     int
 		errFunc    func(err error) bool
 	}
 	tests := []struct {
@@ -391,6 +393,29 @@ func TestUserRegisterAggregate(t *testing.T) {
 			res: res{
 				eventLen:   2,
 				eventTypes: []models.EventType{model.HumanRegistered, model.InitializedHumanCodeAdded},
+				aggLen:     2,
+			},
+		},
+		{
+			name: "user register with erxternalIDP aggregate ok",
+			args: args{
+				ctx: authz.NewMockContext("orgID", "userID"),
+				user: &model.User{
+					ObjectRoot: models.ObjectRoot{AggregateID: "ID"},
+					UserName:   "UserName",
+					Human: &model.Human{
+						Profile: &model.Profile{DisplayName: "DisplayName"},
+						Email:   &model.Email{EmailAddress: "EmailAddress"},
+					},
+				},
+				externalIDP:   &model.ExternalIDP{IDPConfigID: "IDPConfigID"},
+				resourceOwner: "newResourceowner",
+				aggCreator:    models.NewAggregateCreator("Test"),
+			},
+			res: res{
+				eventLen:   2,
+				eventTypes: []models.EventType{model.HumanRegistered, model.HumanExternalIDPAdded},
+				aggLen:     3,
 			},
 		},
 		{
@@ -406,25 +431,6 @@ func TestUserRegisterAggregate(t *testing.T) {
 				errFunc: caos_errs.IsPreconditionFailed,
 			},
 		},
-		{
-			name: "code nil",
-			args: args{
-				ctx:           authz.NewMockContext("orgID", "userID"),
-				resourceOwner: "newResourceowner",
-				user: &model.User{
-					ObjectRoot: models.ObjectRoot{AggregateID: "ID"},
-					UserName:   "UserName",
-					Human: &model.Human{
-						Profile: &model.Profile{DisplayName: "DisplayName"},
-						Email:   &model.Email{EmailAddress: "EmailAddress"},
-					},
-				},
-				aggCreator: models.NewAggregateCreator("Test"),
-			},
-			res: res{
-				errFunc: caos_errs.IsPreconditionFailed,
-			},
-		},
 		{
 			name: "create with init code",
 			args: args{
@@ -444,6 +450,7 @@ func TestUserRegisterAggregate(t *testing.T) {
 			res: res{
 				eventLen:   2,
 				eventTypes: []models.EventType{model.HumanRegistered, model.InitializedHumanCodeAdded},
+				aggLen:     2,
 			},
 		},
 		{
@@ -468,16 +475,20 @@ func TestUserRegisterAggregate(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			aggregates, err := UserRegisterAggregate(tt.args.ctx, tt.args.aggCreator, tt.args.user, tt.args.resourceOwner, tt.args.initCode, false)
+			aggregates, err := UserRegisterAggregate(tt.args.ctx, tt.args.aggCreator, tt.args.user, tt.args.externalIDP, tt.args.resourceOwner, tt.args.initCode, false)

-			if tt.res.errFunc == nil && len(aggregates[1].Events) != tt.res.eventLen {
-				t.Errorf("got wrong event len: expected: %v, actual: %v ", tt.res.eventLen, len(aggregates[1].Events))
+			if tt.res.errFunc == nil && len(aggregates) != tt.res.aggLen {
+				t.Errorf("got wrong aggregates len: expected: %v, actual: %v ", tt.res.aggLen, len(aggregates))
+			}
+
+			if tt.res.errFunc == nil && len(aggregates[tt.res.aggLen-1].Events) != tt.res.eventLen {
+				t.Errorf("got wrong event len: expected: %v, actual: %v ", tt.res.eventLen, len(aggregates[tt.res.aggLen-1].Events))
 			}
 			for i := 0; i < tt.res.eventLen; i++ {
-				if tt.res.errFunc == nil && aggregates[1].Events[i].Type != tt.res.eventTypes[i] {
-					t.Errorf("got wrong event type: expected: %v, actual: %v ", tt.res.eventTypes[i], aggregates[1].Events[i].Type.String())
+				if tt.res.errFunc == nil && aggregates[tt.res.aggLen-1].Events[i].Type != tt.res.eventTypes[i] {
+					t.Errorf("got wrong event type: expected: %v, actual: %v ", tt.res.eventTypes[i], aggregates[tt.res.aggLen-1].Events[i].Type.String())
 				}
-				if tt.res.errFunc == nil && aggregates[1].Events[i].Data == nil {
+				if tt.res.errFunc == nil && aggregates[tt.res.aggLen-1].Events[i].Data == nil {
 					t.Errorf("should have data in event")
 				}
 			}
@@ -2274,3 +2285,136 @@ func TestOTPRemoveAggregate(t *testing.T) {
 		})
 	}
 }
+
+func TestExternalIDPAddedAggregates(t *testing.T) {
+	type res struct {
+		aggregateCount int
+		isErr          func(error) bool
+	}
+	type args struct {
+		ctx         context.Context
+		aggCreator  *models.AggregateCreator
+		user        *model.User
+		externalIDP *model.ExternalIDP
+	}
+	tests := []struct {
+		name string
+		args args
+		res  res
+	}{
+		{
+			name: "no user error",
+			args: args{
+				ctx:        authz.NewMockContext("org", "user"),
+				aggCreator: models.NewAggregateCreator("test"),
+				user:       nil,
+			},
+			res: res{
+				aggregateCount: 0,
+				isErr:          caos_errs.IsPreconditionFailed,
+			},
+		},
+		{
+			name: "user add external idp successful",
+			args: args{
+				ctx:        authz.NewMockContext("org", "user"),
+				aggCreator: models.NewAggregateCreator("test"),
+				user: &model.User{
+					ObjectRoot: models.ObjectRoot{
+						AggregateID: "AggregateID",
+						Sequence:    5,
+					},
+				},
+				externalIDP: &model.ExternalIDP{
+					IDPConfigID: "IDPConfigID",
+					UserID:      "UserID",
+					DisplayName: "DisplayName",
+				},
+			},
+			res: res{
+				aggregateCount: 2,
+				isErr:          nil,
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := ExternalIDPAddedAggregate(tt.args.ctx, tt.args.aggCreator, tt.args.user, tt.args.externalIDP)
+			if tt.res.isErr == nil && err != nil {
+				t.Errorf("no error expected got %T: %v", err, err)
+			}
+			if tt.res.isErr != nil && !tt.res.isErr(err) {
+				t.Errorf("wrong error got %T: %v", err, err)
+			}
+			if tt.res.isErr == nil && len(got) != tt.res.aggregateCount {
+				t.Errorf("ExternalIDPAddedAggregate() aggregate count = %d, wanted count %d", len(got), tt.res.aggregateCount)
+			}
+		})
+	}
+}
+
+func TestExternalIDPRemovedAggregates(t *testing.T) {
+	type res struct {
+		aggregateCount int
+		isErr          func(error) bool
+	}
+	type args struct {
+		ctx         context.Context
+		aggCreator  *models.AggregateCreator
+		user        *model.User
+		externalIDP *model.ExternalIDP
+	}
+	tests := []struct {
+		name string
+		args args
+		res  res
+	}{
+		{
+			name: "no user error",
+			args: args{
+				ctx:        authz.NewMockContext("org", "user"),
+				aggCreator: models.NewAggregateCreator("test"),
+				user:       nil,
+			},
+			res: res{
+				aggregateCount: 0,
+				isErr:          caos_errs.IsPreconditionFailed,
+			},
+		},
+		{
+			name: "user removed external idp successful",
+			args: args{
+				ctx:        authz.NewMockContext("org", "user"),
+				aggCreator: models.NewAggregateCreator("test"),
+				user: &model.User{
+					ObjectRoot: models.ObjectRoot{
+						AggregateID: "AggregateID",
+						Sequence:    5,
+					},
+				},
+				externalIDP: &model.ExternalIDP{
+					IDPConfigID: "IDPConfigID",
+					UserID:      "UserID",
+				},
+			},
+			res: res{
+				aggregateCount: 2,
+				isErr:          nil,
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := ExternalIDPRemovedAggregate(tt.args.ctx, tt.args.aggCreator, tt.args.user, tt.args.externalIDP, false)
+			if tt.res.isErr == nil && err != nil {
+				t.Errorf("no error expected got %T: %v", err, err)
+			}
+			if tt.res.isErr != nil && !tt.res.isErr(err) {
+				t.Errorf("wrong error got %T: %v", err, err)
+			}
+			if tt.res.isErr == nil && len(got) != tt.res.aggregateCount {
+				t.Errorf("ExternalIDPRemovedAggregate() aggregate count = %d, wanted count %d", len(got), tt.res.aggregateCount)
+			}
+		})
+	}
+}
--- a/internal/user/repository/view/external_idp_view.go
+++ b/internal/user/repository/view/external_idp_view.go
@@ -0,0 +1,117 @@
+package view
+
+import (
+	"github.com/caos/zitadel/internal/view/repository"
+
+	"github.com/jinzhu/gorm"
+
+	caos_errs "github.com/caos/zitadel/internal/errors"
+	global_model "github.com/caos/zitadel/internal/model"
+	usr_model "github.com/caos/zitadel/internal/user/model"
+	"github.com/caos/zitadel/internal/user/repository/view/model"
+)
+
+func ExternalIDPByExternalUserIDAndIDPConfigID(db *gorm.DB, table, externalUserID, idpConfigID string) (*model.ExternalIDPView, error) {
+	user := new(model.ExternalIDPView)
+	userIDQuery := &model.ExternalIDPSearchQuery{
+		Key:    usr_model.ExternalIDPSearchKeyExternalUserID,
+		Method: global_model.SearchMethodEquals,
+		Value:  externalUserID,
+	}
+	idpConfigIDQuery := &model.ExternalIDPSearchQuery{
+		Key:    usr_model.ExternalIDPSearchKeyIdpConfigID,
+		Method: global_model.SearchMethodEquals,
+		Value:  idpConfigID,
+	}
+	query := repository.PrepareGetByQuery(table, userIDQuery, idpConfigIDQuery)
+	err := query(db, user)
+	if caos_errs.IsNotFound(err) {
+		return nil, caos_errs.ThrowNotFound(nil, "VIEW-Mso9f", "Errors.ExternalIDP.NotFound")
+	}
+	return user, err
+}
+
+func ExternalIDPByExternalUserIDAndIDPConfigIDAndResourceOwner(db *gorm.DB, table, externalUserID, idpConfigID, resourceOwner string) (*model.ExternalIDPView, error) {
+	user := new(model.ExternalIDPView)
+	userIDQuery := &model.ExternalIDPSearchQuery{
+		Key:    usr_model.ExternalIDPSearchKeyExternalUserID,
+		Method: global_model.SearchMethodEquals,
+		Value:  externalUserID,
+	}
+	idpConfigIDQuery := &model.ExternalIDPSearchQuery{
+		Key:    usr_model.ExternalIDPSearchKeyIdpConfigID,
+		Method: global_model.SearchMethodEquals,
+		Value:  idpConfigID,
+	}
+	resourceOwnerQuery := &model.ExternalIDPSearchQuery{
+		Key:    usr_model.ExternalIDPSearchKeyResourceOwner,
+		Method: global_model.SearchMethodEquals,
+		Value:  resourceOwner,
+	}
+	query := repository.PrepareGetByQuery(table, userIDQuery, idpConfigIDQuery, resourceOwnerQuery)
+	err := query(db, user)
+	if caos_errs.IsNotFound(err) {
+		return nil, caos_errs.ThrowNotFound(nil, "VIEW-Sf8sd", "Errors.ExternalIDP.NotFound")
+	}
+	return user, err
+}
+
+func ExternalIDPsByIDPConfigID(db *gorm.DB, table, idpConfigID string) ([]*model.ExternalIDPView, error) {
+	externalIDPs := make([]*model.ExternalIDPView, 0)
+	orgIDQuery := &usr_model.ExternalIDPSearchQuery{
+		Key:    usr_model.ExternalIDPSearchKeyIdpConfigID,
+		Method: global_model.SearchMethodEquals,
+		Value:  idpConfigID,
+	}
+	query := repository.PrepareSearchQuery(table, model.ExternalIDPSearchRequest{
+		Queries: []*usr_model.ExternalIDPSearchQuery{orgIDQuery},
+	})
+	_, err := query(db, &externalIDPs)
+	return externalIDPs, err
+}
+
+func ExternalIDPsByUserID(db *gorm.DB, table, userID string) ([]*model.ExternalIDPView, error) {
+	externalIDPs := make([]*model.ExternalIDPView, 0)
+	orgIDQuery := &usr_model.ExternalIDPSearchQuery{
+		Key:    usr_model.ExternalIDPSearchKeyUserID,
+		Method: global_model.SearchMethodEquals,
+		Value:  userID,
+	}
+	query := repository.PrepareSearchQuery(table, model.ExternalIDPSearchRequest{
+		Queries: []*usr_model.ExternalIDPSearchQuery{orgIDQuery},
+	})
+	_, err := query(db, &externalIDPs)
+	return externalIDPs, err
+}
+
+func SearchExternalIDPs(db *gorm.DB, table string, req *usr_model.ExternalIDPSearchRequest) ([]*model.ExternalIDPView, uint64, error) {
+	externalIDPs := make([]*model.ExternalIDPView, 0)
+	query := repository.PrepareSearchQuery(table, model.ExternalIDPSearchRequest{Limit: req.Limit, Offset: req.Offset, Queries: req.Queries})
+	count, err := query(db, &externalIDPs)
+	if err != nil {
+		return nil, 0, err
+	}
+	return externalIDPs, count, nil
+}
+
+func PutExternalIDPs(db *gorm.DB, table string, externalIDPs ...*model.ExternalIDPView) error {
+	save := repository.PrepareBulkSave(table)
+	u := make([]interface{}, len(externalIDPs))
+	for i, idp := range externalIDPs {
+		u[i] = idp
+	}
+	return save(db, u...)
+}
+
+func PutExternalIDP(db *gorm.DB, table string, idp *model.ExternalIDPView) error {
+	save := repository.PrepareSave(table)
+	return save(db, idp)
+}
+
+func DeleteExternalIDP(db *gorm.DB, table, externalUserID, idpConfigID string) error {
+	delete := repository.PrepareDeleteByKeys(table,
+		repository.Key{Key: model.ExternalIDPSearchKey(usr_model.ExternalIDPSearchKeyExternalUserID), Value: externalUserID},
+		repository.Key{Key: model.ExternalIDPSearchKey(usr_model.ExternalIDPSearchKeyIdpConfigID), Value: idpConfigID},
+	)
+	return delete(db)
+}
--- a/internal/user/repository/view/model/external_idp_query.go
+++ b/internal/user/repository/view/model/external_idp_query.go
@@ -0,0 +1,65 @@
+package model
+
+import (
+	global_model "github.com/caos/zitadel/internal/model"
+	usr_model "github.com/caos/zitadel/internal/user/model"
+	"github.com/caos/zitadel/internal/view/repository"
+)
+
+type ExternalIDPSearchRequest usr_model.ExternalIDPSearchRequest
+type ExternalIDPSearchQuery usr_model.ExternalIDPSearchQuery
+type ExternalIDPSearchKey usr_model.ExternalIDPSearchKey
+
+func (req ExternalIDPSearchRequest) GetLimit() uint64 {
+	return req.Limit
+}
+
+func (req ExternalIDPSearchRequest) GetOffset() uint64 {
+	return req.Offset
+}
+
+func (req ExternalIDPSearchRequest) GetSortingColumn() repository.ColumnKey {
+	if req.SortingColumn == usr_model.ExternalIDPSearchKeyUnspecified {
+		return nil
+	}
+	return ExternalIDPSearchKey(req.SortingColumn)
+}
+
+func (req ExternalIDPSearchRequest) GetAsc() bool {
+	return req.Asc
+}
+
+func (req ExternalIDPSearchRequest) GetQueries() []repository.SearchQuery {
+	result := make([]repository.SearchQuery, len(req.Queries))
+	for i, q := range req.Queries {
+		result[i] = ExternalIDPSearchQuery{Key: q.Key, Value: q.Value, Method: q.Method}
+	}
+	return result
+}
+
+func (req ExternalIDPSearchQuery) GetKey() repository.ColumnKey {
+	return ExternalIDPSearchKey(req.Key)
+}
+
+func (req ExternalIDPSearchQuery) GetMethod() global_model.SearchMethod {
+	return req.Method
+}
+
+func (req ExternalIDPSearchQuery) GetValue() interface{} {
+	return req.Value
+}
+
+func (key ExternalIDPSearchKey) ToColumnName() string {
+	switch usr_model.ExternalIDPSearchKey(key) {
+	case usr_model.ExternalIDPSearchKeyExternalUserID:
+		return ExternalIDPKeyExternalUserID
+	case usr_model.ExternalIDPSearchKeyUserID:
+		return ExternalIDPKeyUserID
+	case usr_model.ExternalIDPSearchKeyIdpConfigID:
+		return ExternalIDPKeyIDPConfigID
+	case usr_model.ExternalIDPSearchKeyResourceOwner:
+		return ExternalIDPKeyResourceOwner
+	default:
+		return ""
+	}
+}
--- a/internal/user/repository/view/model/external_idps.go
+++ b/internal/user/repository/view/model/external_idps.go
@@ -0,0 +1,91 @@
+package model
+
+import (
+	"encoding/json"
+	"github.com/caos/logging"
+	caos_errs "github.com/caos/zitadel/internal/errors"
+	"github.com/caos/zitadel/internal/eventstore/models"
+	"github.com/caos/zitadel/internal/user/model"
+	es_model "github.com/caos/zitadel/internal/user/repository/eventsourcing/model"
+	"time"
+)
+
+const (
+	ExternalIDPKeyExternalUserID = "external_user_id"
+	ExternalIDPKeyUserID         = "user_id"
+	ExternalIDPKeyIDPConfigID    = "idp_config_id"
+	ExternalIDPKeyResourceOwner  = "resource_owner"
+)
+
+type ExternalIDPView struct {
+	ExternalUserID  string    `json:"userID" gorm:"column:external_user_id;primary_key"`
+	IDPConfigID     string    `json:"idpConfigID" gorm:"column:idp_config_id;primary_key"`
+	UserID          string    `json:"-" gorm:"column:user_id"`
+	IDPName         string    `json:"-" gorm:"column:idp_name"`
+	UserDisplayName string    `json:"displayName" gorm:"column:user_display_name"`
+	CreationDate    time.Time `json:"-" gorm:"column:creation_date"`
+	ChangeDate      time.Time `json:"-" gorm:"column:change_date"`
+	ResourceOwner   string    `json:"-" gorm:"column:resource_owner"`
+	Sequence        uint64    `json:"-" gorm:"column:sequence"`
+}
+
+func ExternalIDPViewFromModel(externalIDP *model.ExternalIDPView) *ExternalIDPView {
+	return &ExternalIDPView{
+		UserID:          externalIDP.UserID,
+		IDPConfigID:     externalIDP.IDPConfigID,
+		ExternalUserID:  externalIDP.ExternalUserID,
+		IDPName:         externalIDP.IDPName,
+		UserDisplayName: externalIDP.UserDisplayName,
+		Sequence:        externalIDP.Sequence,
+		CreationDate:    externalIDP.CreationDate,
+		ChangeDate:      externalIDP.ChangeDate,
+		ResourceOwner:   externalIDP.ResourceOwner,
+	}
+}
+
+func ExternalIDPViewToModel(externalIDP *ExternalIDPView) *model.ExternalIDPView {
+	return &model.ExternalIDPView{
+		UserID:          externalIDP.UserID,
+		IDPConfigID:     externalIDP.IDPConfigID,
+		ExternalUserID:  externalIDP.ExternalUserID,
+		IDPName:         externalIDP.IDPName,
+		UserDisplayName: externalIDP.UserDisplayName,
+		Sequence:        externalIDP.Sequence,
+		CreationDate:    externalIDP.CreationDate,
+		ChangeDate:      externalIDP.ChangeDate,
+		ResourceOwner:   externalIDP.ResourceOwner,
+	}
+}
+
+func ExternalIDPViewsToModel(externalIDPs []*ExternalIDPView) []*model.ExternalIDPView {
+	result := make([]*model.ExternalIDPView, len(externalIDPs))
+	for i, r := range externalIDPs {
+		result[i] = ExternalIDPViewToModel(r)
+	}
+	return result
+}
+
+func (i *ExternalIDPView) AppendEvent(event *models.Event) (err error) {
+	i.Sequence = event.Sequence
+	i.ChangeDate = event.CreationDate
+	switch event.Type {
+	case es_model.HumanExternalIDPAdded:
+		i.setRootData(event)
+		i.CreationDate = event.CreationDate
+		err = i.SetData(event)
+	}
+	return err
+}
+
+func (r *ExternalIDPView) setRootData(event *models.Event) {
+	r.UserID = event.AggregateID
+	r.ResourceOwner = event.ResourceOwner
+}
+
+func (r *ExternalIDPView) SetData(event *models.Event) error {
+	if err := json.Unmarshal(event.Data, r); err != nil {
+		logging.Log("EVEN-48sfs").WithError(err).Error("could not unmarshal event data")
+		return caos_errs.ThrowInternal(err, "MODEL-Hs8uf", "Could not unmarshal data")
+	}
+	return nil
+}
--- a/internal/user/repository/view/user_view.go
+++ b/internal/user/repository/view/user_view.go
@@ -46,6 +46,26 @@ func UserByLoginName(db *gorm.DB, table, loginName string) (*model.UserView, err
 	return user, err
 }

+func UserByLoginNameAndResourceOwner(db *gorm.DB, table, loginName, resourceOwner string) (*model.UserView, error) {
+	user := new(model.UserView)
+	loginNameQuery := &model.UserSearchQuery{
+		Key:    usr_model.UserSearchKeyLoginNames,
+		Method: global_model.SearchMethodListContains,
+		Value:  loginName,
+	}
+	resourceOwnerQuery := &model.UserSearchQuery{
+		Key:    usr_model.UserSearchKeyResourceOwner,
+		Method: global_model.SearchMethodEquals,
+		Value:  resourceOwner,
+	}
+	query := repository.PrepareGetByQuery(table, loginNameQuery, resourceOwnerQuery)
+	err := query(db, user)
+	if caos_errs.IsNotFound(err) {
+		return nil, caos_errs.ThrowNotFound(nil, "VIEW-AD4qs", "Errors.User.NotFound")
+	}
+	return user, err
+}
+
 func UsersByOrgID(db *gorm.DB, table, orgID string) ([]*model.UserView, error) {
 	users := make([]*model.UserView, 0)
 	orgIDQuery := &usr_model.UserSearchQuery{