Map OIDC groups to Orgs/Teams (#21441)

Fixes #19555 Test-Instructions: https://github.com/go-gitea/gitea/pull/21441#issuecomment-1419438000 This PR implements the mapping of user groups provided by OIDC providers to orgs teams in Gitea. The main part is a refactoring of the existing LDAP code to make it usable from different providers. Refactorings: - Moved the router auth code from module to service because of import cycles - Changed some model methods to take a `Context` parameter - Moved the mapping code from LDAP to a common location I've tested it with Keycloak but other providers should work too. The JSON mapping format is the same as for LDAP. ![grafik](https://user-images.githubusercontent.com/1666336/195634392-3fc540fc-b229-4649-99ac-91ae8e19df2d.png) --------- Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
2023-02-08 07:44:42 +01:00 · 2023-02-08 07:44:42 +01:00 · e8186f1c0f
parent 2c6cc0b8c9
commit e8186f1c0f
34 changed files with 504 additions and 427 deletions
--- a/cmd/admin.go
+++ b/cmd/admin.go
@ -372,6 +372,15 @@ var (
 			Value: "",
 			Usage: "Group Claim value for restricted users",
 		},
+		cli.StringFlag{
+			Name:  "group-team-map",
+			Value: "",
+			Usage: "JSON mapping between groups and org teams",
+		},
+		cli.BoolFlag{
+			Name:  "group-team-map-removal",
+			Usage: "Activate automatic team membership removal depending on groups",
+		},
 	}

 	microcmdAuthUpdateOauth = cli.Command{
@ -853,6 +862,8 @@ func parseOAuth2Config(c *cli.Context) *oauth2.Source {
 		GroupClaimName:                c.String("group-claim-name"),
 		AdminGroup:                    c.String("admin-group"),
 		RestrictedGroup:               c.String("restricted-group"),
+		GroupTeamMap:                  c.String("group-team-map"),
+		GroupTeamMapRemoval:           c.Bool("group-team-map-removal"),
 	}
 }

@ -935,6 +946,12 @@ func runUpdateOauth(c *cli.Context) error {
 	if c.IsSet("restricted-group") {
 		oAuth2Config.RestrictedGroup = c.String("restricted-group")
 	}
+	if c.IsSet("group-team-map") {
+		oAuth2Config.GroupTeamMap = c.String("group-team-map")
+	}
+	if c.IsSet("group-team-map-removal") {
+		oAuth2Config.GroupTeamMapRemoval = c.Bool("group-team-map-removal")
+	}

 	// update custom URL mapping
 	customURLMapping := &oauth2.CustomURLMapping{}
--- a/docs/content/doc/usage/command-line.en-us.md
+++ b/docs/content/doc/usage/command-line.en-us.md
@ -137,6 +137,8 @@ Admin operations:
        - `--group-claim-name`: Claim name providing group names for this source. (Optional)
        - `--admin-group`: Group Claim value for administrator users. (Optional)
        - `--restricted-group`: Group Claim value for restricted users. (Optional)
+        - `--group-team-map`: JSON mapping between groups and org teams. (Optional)
+        - `--group-team-map-removal`: Activate automatic team membership removal depending on groups. (Optional)
      - Examples:
        - `gitea admin auth add-oauth --name external-github --provider github --key OBTAIN_FROM_SOURCE --secret OBTAIN_FROM_SOURCE`
    - `update-oauth`:
--- a/models/organization/org.go
+++ b/models/organization/org.go
@ -110,22 +110,14 @@ func (org *Organization) CanCreateOrgRepo(uid int64) (bool, error) {
 	return CanCreateOrgRepo(db.DefaultContext, org.ID, uid)
 }

-func (org *Organization) getTeam(ctx context.Context, name string) (*Team, error) {
+// GetTeam returns named team of organization.
+func (org *Organization) GetTeam(ctx context.Context, name string) (*Team, error) {
 	return GetTeam(ctx, org.ID, name)
 }

-// GetTeam returns named team of organization.
-func (org *Organization) GetTeam(name string) (*Team, error) {
-	return org.getTeam(db.DefaultContext, name)
-}
-
-func (org *Organization) getOwnerTeam(ctx context.Context) (*Team, error) {
-	return org.getTeam(ctx, OwnerTeamName)
-}
-
 // GetOwnerTeam returns owner team of organization.
-func (org *Organization) GetOwnerTeam() (*Team, error) {
-	return org.getOwnerTeam(db.DefaultContext)
+func (org *Organization) GetOwnerTeam(ctx context.Context) (*Team, error) {
+	return org.GetTeam(ctx, OwnerTeamName)
 }

 // FindOrgTeams returns all teams of a given organization
@ -342,7 +334,7 @@ func CreateOrganization(org *Organization, owner *user_model.User) (err error) {
 }

 // GetOrgByName returns organization by given name.
-func GetOrgByName(name string) (*Organization, error) {
+func GetOrgByName(ctx context.Context, name string) (*Organization, error) {
 	if len(name) == 0 {
 		return nil, ErrOrgNotExist{0, name}
 	}
@ -350,7 +342,7 @@ func GetOrgByName(name string) (*Organization, error) {
 		LowerName: strings.ToLower(name),
 		Type:      user_model.UserTypeOrganization,
 	}
-	has, err := db.GetEngine(db.DefaultContext).Get(u)
+	has, err := db.GetEngine(ctx).Get(u)
 	if err != nil {
 		return nil, err
 	} else if !has {
--- a/models/organization/org_test.go
+++ b/models/organization/org_test.go
@ -61,28 +61,28 @@ func TestUser_IsOrgMember(t *testing.T) {
 func TestUser_GetTeam(t *testing.T) {
 	assert.NoError(t, unittest.PrepareTestDatabase())
 	org := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 3})
-	team, err := org.GetTeam("team1")
+	team, err := org.GetTeam(db.DefaultContext, "team1")
 	assert.NoError(t, err)
 	assert.Equal(t, org.ID, team.OrgID)
 	assert.Equal(t, "team1", team.LowerName)

-	_, err = org.GetTeam("does not exist")
+	_, err = org.GetTeam(db.DefaultContext, "does not exist")
 	assert.True(t, organization.IsErrTeamNotExist(err))

 	nonOrg := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 2})
-	_, err = nonOrg.GetTeam("team")
+	_, err = nonOrg.GetTeam(db.DefaultContext, "team")
 	assert.True(t, organization.IsErrTeamNotExist(err))
 }

 func TestUser_GetOwnerTeam(t *testing.T) {
 	assert.NoError(t, unittest.PrepareTestDatabase())
 	org := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 3})
-	team, err := org.GetOwnerTeam()
+	team, err := org.GetOwnerTeam(db.DefaultContext)
 	assert.NoError(t, err)
 	assert.Equal(t, org.ID, team.OrgID)

 	nonOrg := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 2})
-	_, err = nonOrg.GetOwnerTeam()
+	_, err = nonOrg.GetOwnerTeam(db.DefaultContext)
 	assert.True(t, organization.IsErrTeamNotExist(err))
 }

@ -115,15 +115,15 @@ func TestUser_GetMembers(t *testing.T) {
 func TestGetOrgByName(t *testing.T) {
 	assert.NoError(t, unittest.PrepareTestDatabase())

-	org, err := organization.GetOrgByName("user3")
+	org, err := organization.GetOrgByName(db.DefaultContext, "user3")
 	assert.NoError(t, err)
 	assert.EqualValues(t, 3, org.ID)
 	assert.Equal(t, "user3", org.Name)

-	_, err = organization.GetOrgByName("user2") // user2 is an individual
+	_, err = organization.GetOrgByName(db.DefaultContext, "user2") // user2 is an individual
 	assert.True(t, organization.IsErrOrgNotExist(err))

-	_, err = organization.GetOrgByName("") // corner case
+	_, err = organization.GetOrgByName(db.DefaultContext, "") // corner case
 	assert.True(t, organization.IsErrOrgNotExist(err))
 }

--- a/modules/auth/common.go
+++ b/modules/auth/common.go
@ -0,0 +1,22 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package auth
+
+import (
+	"code.gitea.io/gitea/modules/json"
+	"code.gitea.io/gitea/modules/log"
+)
+
+func UnmarshalGroupTeamMapping(raw string) (map[string]map[string][]string, error) {
+	groupTeamMapping := make(map[string]map[string][]string)
+	if raw == "" {
+		return groupTeamMapping, nil
+	}
+	err := json.Unmarshal([]byte(raw), &groupTeamMapping)
+	if err != nil {
+		log.Error("Failed to unmarshal group team mapping: %v", err)
+		return nil, err
+	}
+	return groupTeamMapping, nil
+}
--- a/modules/context/api.go
+++ b/modules/context/api.go
@ -19,7 +19,6 @@ import (
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/web/middleware"
-	auth_service "code.gitea.io/gitea/services/auth"
 )

 // APIContext is a specific context for API service
@ -215,35 +214,6 @@ func (ctx *APIContext) CheckForOTP() {
 	}
 }

-// APIAuth converts auth_service.Auth as a middleware
-func APIAuth(authMethod auth_service.Method) func(*APIContext) {
-	return func(ctx *APIContext) {
-		// Get user from session if logged in.
-		var err error
-		ctx.Doer, err = authMethod.Verify(ctx.Req, ctx.Resp, ctx, ctx.Session)
-		if err != nil {
-			ctx.Error(http.StatusUnauthorized, "APIAuth", err)
-			return
-		}
-
-		if ctx.Doer != nil {
-			if ctx.Locale.Language() != ctx.Doer.Language {
-				ctx.Locale = middleware.Locale(ctx.Resp, ctx.Req)
-			}
-			ctx.IsBasicAuth = ctx.Data["AuthedMethod"].(string) == auth_service.BasicMethodName
-			ctx.IsSigned = true
-			ctx.Data["IsSigned"] = ctx.IsSigned
-			ctx.Data["SignedUser"] = ctx.Doer
-			ctx.Data["SignedUserID"] = ctx.Doer.ID
-			ctx.Data["SignedUserName"] = ctx.Doer.Name
-			ctx.Data["IsAdmin"] = ctx.Doer.IsAdmin
-		} else {
-			ctx.Data["SignedUserID"] = int64(0)
-			ctx.Data["SignedUserName"] = ""
-		}
-	}
-}
-
 // APIContexter returns apicontext as middleware
 func APIContexter() func(http.Handler) http.Handler {
 	return func(next http.Handler) http.Handler {
--- a/modules/context/context.go
+++ b/modules/context/context.go
@ -36,7 +36,6 @@ import (
 	"code.gitea.io/gitea/modules/typesniffer"
 	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/modules/web/middleware"
-	"code.gitea.io/gitea/services/auth"

 	"gitea.com/go-chi/cache"
 	"gitea.com/go-chi/session"
@ -659,37 +658,6 @@ func getCsrfOpts() CsrfOptions {
 	}
 }

-// Auth converts auth.Auth as a middleware
-func Auth(authMethod auth.Method) func(*Context) {
-	return func(ctx *Context) {
-		var err error
-		ctx.Doer, err = authMethod.Verify(ctx.Req, ctx.Resp, ctx, ctx.Session)
-		if err != nil {
-			log.Error("Failed to verify user %v: %v", ctx.Req.RemoteAddr, err)
-			ctx.Error(http.StatusUnauthorized, "Verify")
-			return
-		}
-		if ctx.Doer != nil {
-			if ctx.Locale.Language() != ctx.Doer.Language {
-				ctx.Locale = middleware.Locale(ctx.Resp, ctx.Req)
-			}
-			ctx.IsBasicAuth = ctx.Data["AuthedMethod"].(string) == auth.BasicMethodName
-			ctx.IsSigned = true
-			ctx.Data["IsSigned"] = ctx.IsSigned
-			ctx.Data["SignedUser"] = ctx.Doer
-			ctx.Data["SignedUserID"] = ctx.Doer.ID
-			ctx.Data["SignedUserName"] = ctx.Doer.Name
-			ctx.Data["IsAdmin"] = ctx.Doer.IsAdmin
-		} else {
-			ctx.Data["SignedUserID"] = int64(0)
-			ctx.Data["SignedUserName"] = ""
-
-			// ensure the session uid is deleted
-			_ = ctx.Session.Delete("uid")
-		}
-	}
-}
-
 // Contexter initializes a classic context for a request.
 func Contexter(ctx context.Context) func(next http.Handler) http.Handler {
 	_, rnd := templates.HTMLRenderer(ctx)
--- a/modules/context/org.go
+++ b/modules/context/org.go
@ -80,7 +80,7 @@ func HandleOrgAssignment(ctx *Context, args ...bool) {
 	orgName := ctx.Params(":org")

 	var err error
-	ctx.Org.Organization, err = organization.GetOrgByName(orgName)
+	ctx.Org.Organization, err = organization.GetOrgByName(ctx, orgName)
 	if err != nil {
 		if organization.IsErrOrgNotExist(err) {
 			redirectUserID, err := user_model.LookupUserRedirect(orgName)
--- a/modules/repository/create_test.go
+++ b/modules/repository/create_test.go
@ -49,7 +49,7 @@ func TestIncludesAllRepositoriesTeams(t *testing.T) {
 	assert.NoError(t, organization.CreateOrganization(org, user), "CreateOrganization")

 	// Check Owner team.
-	ownerTeam, err := org.GetOwnerTeam()
+	ownerTeam, err := org.GetOwnerTeam(db.DefaultContext)
 	assert.NoError(t, err, "GetOwnerTeam")
 	assert.True(t, ownerTeam.IncludesAllRepositories, "Owner team includes all repositories")

@ -63,7 +63,7 @@ func TestIncludesAllRepositoriesTeams(t *testing.T) {
 		}
 	}
 	// Get fresh copy of Owner team after creating repos.
-	ownerTeam, err = org.GetOwnerTeam()
+	ownerTeam, err = org.GetOwnerTeam(db.DefaultContext)
 	assert.NoError(t, err, "GetOwnerTeam")

 	// Create teams and check repositories.
--- a/modules/repository/repo.go
+++ b/modules/repository/repo.go
@ -57,7 +57,7 @@ func MigrateRepositoryGitData(ctx context.Context, u *user_model.User,
 	repoPath := repo_model.RepoPath(u.Name, opts.RepoName)

 	if u.IsOrganization() {
-		t, err := organization.OrgFromUser(u).GetOwnerTeam()
+		t, err := organization.OrgFromUser(u).GetOwnerTeam(ctx)
 		if err != nil {
 			return nil, err
 		}
--- a/modules/validation/binding.go
+++ b/modules/validation/binding.go
@ -8,6 +8,7 @@ import (
 	"regexp"
 	"strings"

+	"code.gitea.io/gitea/modules/auth"
 	"code.gitea.io/gitea/modules/git"

 	"gitea.com/go-chi/binding"
@ -17,15 +18,14 @@ import (
 const (
 	// ErrGitRefName is git reference name error
 	ErrGitRefName = "GitRefNameError"
-
 	// ErrGlobPattern is returned when glob pattern is invalid
 	ErrGlobPattern = "GlobPattern"
-
 	// ErrRegexPattern is returned when a regex pattern is invalid
 	ErrRegexPattern = "RegexPattern"
-
 	// ErrUsername is username error
 	ErrUsername = "UsernameError"
+	// ErrInvalidGroupTeamMap is returned when a group team mapping is invalid
+	ErrInvalidGroupTeamMap = "InvalidGroupTeamMap"
 )

 // AddBindingRules adds additional binding rules
@ -37,6 +37,7 @@ func AddBindingRules() {
 	addRegexPatternRule()
 	addGlobOrRegexPatternRule()
 	addUsernamePatternRule()
+	addValidGroupTeamMapRule()
 }

 func addGitRefNameBindingRule() {
@ -167,6 +168,23 @@ func addUsernamePatternRule() {
 	})
 }

+func addValidGroupTeamMapRule() {
+	binding.AddRule(&binding.Rule{
+		IsMatch: func(rule string) bool {
+			return strings.HasPrefix(rule, "ValidGroupTeamMap")
+		},
+		IsValid: func(errs binding.Errors, name string, val interface{}) (bool, binding.Errors) {
+			_, err := auth.UnmarshalGroupTeamMapping(fmt.Sprintf("%v", val))
+			if err != nil {
+				errs.Add([]string{name}, ErrInvalidGroupTeamMap, err.Error())
+				return false, errs
+			}
+
+			return true, errs
+		},
+	})
+}
+
 func portOnly(hostport string) string {
 	colon := strings.IndexByte(hostport, ':')
 	if colon == -1 {
--- a/modules/web/middleware/binding.go
+++ b/modules/web/middleware/binding.go
@ -136,6 +136,8 @@ func Validate(errs binding.Errors, data map[string]interface{}, f Form, l transl
 				data["ErrorMsg"] = trName + l.Tr("form.regex_pattern_error", errs[0].Message)
 			case validation.ErrUsername:
 				data["ErrorMsg"] = trName + l.Tr("form.username_error")
+			case validation.ErrInvalidGroupTeamMap:
+				data["ErrorMsg"] = trName + l.Tr("form.invalid_group_team_map_error", errs[0].Message)
 			default:
 				msg := errs[0].Classification
 				if msg != "" && errs[0].Message != "" {
--- a/options/locale/locale_en-US.ini
+++ b/options/locale/locale_en-US.ini
@ -477,6 +477,7 @@ include_error = ` must contain substring '%s'.`
 glob_pattern_error = ` glob pattern is invalid: %s.`
 regex_pattern_error = ` regex pattern is invalid: %s.`
 username_error = ` can only contain alphanumeric chars ('0-9','a-z','A-Z'), dash ('-'), underscore ('_') and dot ('.'). It cannot begin or end with non-alphanumeric chars, and consecutive non-alphanumeric chars are also forbidden.`
+invalid_group_team_map_error = ` mapping is invalid: %s`
 unknown_error = Unknown error:
 captcha_incorrect = The CAPTCHA code is incorrect.
 password_not_match = The passwords do not match.
@ -2758,6 +2759,8 @@ auths.oauth2_required_claim_value_helper = Set this value to restrict login from
 auths.oauth2_group_claim_name = Claim name providing group names for this source. (Optional)
 auths.oauth2_admin_group = Group Claim value for administrator users. (Optional - requires claim name above)
 auths.oauth2_restricted_group = Group Claim value for restricted users. (Optional - requires claim name above)
+auths.oauth2_map_group_to_team = Map claimed groups to Organization teams. (Optional - requires claim name above)
+auths.oauth2_map_group_to_team_removal = Remove users from synchronized teams if user does not belong to corresponding group.
 auths.enable_auto_register = Enable Auto Registration
 auths.sspi_auto_create_users = Automatically create users
 auths.sspi_auto_create_users_helper = Allow SSPI auth method to automatically create new accounts for users that login for the first time
--- a/routers/api/v1/api.go
+++ b/routers/api/v1/api.go
@ -507,7 +507,7 @@ func orgAssignment(args ...bool) func(ctx *context.APIContext) {

 		var err error
 		if assignOrg {
-			ctx.Org.Organization, err = organization.GetOrgByName(ctx.Params(":org"))
+			ctx.Org.Organization, err = organization.GetOrgByName(ctx, ctx.Params(":org"))
 			if err != nil {
 				if organization.IsErrOrgNotExist(err) {
 					redirectUserID, err := user_model.LookupUserRedirect(ctx.Params(":org"))
@ -687,7 +687,7 @@ func Routes(ctx gocontext.Context) *web.Route {
 	}

 	// Get user from session if logged in.
-	m.Use(context.APIAuth(group))
+	m.Use(auth.APIAuth(group))

 	m.Use(context.ToggleAPI(&context.ToggleOptions{
 		SignInRequired: setting.Service.RequireSignInView,
--- a/routers/api/v1/repo/fork.go
+++ b/routers/api/v1/repo/fork.go
@ -108,7 +108,7 @@ func CreateFork(ctx *context.APIContext) {
 	if form.Organization == nil {
 		forker = ctx.Doer
 	} else {
-		org, err := organization.GetOrgByName(*form.Organization)
+		org, err := organization.GetOrgByName(ctx, *form.Organization)
 		if err != nil {
 			if organization.IsErrOrgNotExist(err) {
 				ctx.Error(http.StatusUnprocessableEntity, "", err)
--- a/routers/api/v1/repo/repo.go
+++ b/routers/api/v1/repo/repo.go
@ -468,7 +468,7 @@ func CreateOrgRepo(ctx *context.APIContext) {
 	//   "403":
 	//     "$ref": "#/responses/forbidden"
 	opt := web.GetForm(ctx).(*api.CreateRepoOption)
-	org, err := organization.GetOrgByName(ctx.Params(":org"))
+	org, err := organization.GetOrgByName(ctx, ctx.Params(":org"))
 	if err != nil {
 		if organization.IsErrOrgNotExist(err) {
 			ctx.Error(http.StatusUnprocessableEntity, "", err)
--- a/routers/web/admin/auths.go
+++ b/routers/web/admin/auths.go
@ -204,6 +204,8 @@ func parseOAuth2Config(form forms.AuthenticationForm) *oauth2.Source {
 		GroupClaimName:                form.Oauth2GroupClaimName,
 		RestrictedGroup:               form.Oauth2RestrictedGroup,
 		AdminGroup:                    form.Oauth2AdminGroup,
+		GroupTeamMap:                  form.Oauth2GroupTeamMap,
+		GroupTeamMapRemoval:           form.Oauth2GroupTeamMapRemoval,
 	}
 }

--- a/routers/web/auth/linkaccount.go
+++ b/routers/web/auth/linkaccount.go
@ -16,6 +16,7 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/web"
 	auth_service "code.gitea.io/gitea/services/auth"
+	"code.gitea.io/gitea/services/auth/source/oauth2"
 	"code.gitea.io/gitea/services/externalaccount"
 	"code.gitea.io/gitea/services/forms"

@ -267,5 +268,11 @@ func LinkAccountPostRegister(ctx *context.Context) {
 		return
 	}

+	source := authSource.Cfg.(*oauth2.Source)
+	if err := syncGroupsToTeams(ctx, source, &gothUser, u); err != nil {
+		ctx.ServerError("SyncGroupsToTeams", err)
+		return
+	}
+
 	handleSignIn(ctx, u, false)
 }
--- a/routers/web/auth/oauth.go
+++ b/routers/web/auth/oauth.go
@ -17,7 +17,9 @@ import (
 	"code.gitea.io/gitea/models/auth"
 	org_model "code.gitea.io/gitea/models/organization"
 	user_model "code.gitea.io/gitea/models/user"
+	auth_module "code.gitea.io/gitea/modules/auth"
 	"code.gitea.io/gitea/modules/base"
+	"code.gitea.io/gitea/modules/container"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/json"
 	"code.gitea.io/gitea/modules/log"
@ -27,6 +29,7 @@ import (
 	"code.gitea.io/gitea/modules/web"
 	"code.gitea.io/gitea/modules/web/middleware"
 	auth_service "code.gitea.io/gitea/services/auth"
+	source_service "code.gitea.io/gitea/services/auth/source"
 	"code.gitea.io/gitea/services/auth/source/oauth2"
 	"code.gitea.io/gitea/services/externalaccount"
 	"code.gitea.io/gitea/services/forms"
@ -963,12 +966,19 @@ func SignInOAuthCallback(ctx *context.Context) {
 				IsActive: util.OptionalBoolOf(!setting.OAuth2Client.RegisterEmailConfirm),
 			}

-			setUserGroupClaims(authSource, u, &gothUser)
+			source := authSource.Cfg.(*oauth2.Source)
+
+			setUserAdminAndRestrictedFromGroupClaims(source, u, &gothUser)

 			if !createAndHandleCreatedUser(ctx, base.TplName(""), nil, u, overwriteDefault, &gothUser, setting.OAuth2Client.AccountLinking != setting.OAuth2AccountLinkingDisabled) {
 				// error already handled
 				return
 			}
+
+			if err := syncGroupsToTeams(ctx, source, &gothUser, u); err != nil {
+				ctx.ServerError("SyncGroupsToTeams", err)
+				return
+			}
 		} else {
 			// no existing user is found, request attach or new account
 			showLinkingLogin(ctx, gothUser)
@ -979,7 +989,7 @@ func SignInOAuthCallback(ctx *context.Context) {
 	handleOAuth2SignIn(ctx, authSource, u, gothUser)
 }

-func claimValueToStringSlice(claimValue interface{}) []string {
+func claimValueToStringSet(claimValue interface{}) container.Set[string] {
 	var groups []string

 	switch rawGroup := claimValue.(type) {
@ -993,37 +1003,45 @@ func claimValueToStringSlice(claimValue interface{}) []string {
 		str := fmt.Sprintf("%s", rawGroup)
 		groups = strings.Split(str, ",")
 	}
-	return groups
+	return container.SetOf(groups...)
 }

-func setUserGroupClaims(loginSource *auth.Source, u *user_model.User, gothUser *goth.User) bool {
-	source := loginSource.Cfg.(*oauth2.Source)
-	if source.GroupClaimName == "" || (source.AdminGroup == "" && source.RestrictedGroup == "") {
-		return false
+func syncGroupsToTeams(ctx *context.Context, source *oauth2.Source, gothUser *goth.User, u *user_model.User) error {
+	if source.GroupTeamMap != "" || source.GroupTeamMapRemoval {
+		groupTeamMapping, err := auth_module.UnmarshalGroupTeamMapping(source.GroupTeamMap)
+		if err != nil {
+			return err
+		}
+
+		groups := getClaimedGroups(source, gothUser)
+
+		if err := source_service.SyncGroupsToTeams(ctx, u, groups, groupTeamMapping, source.GroupTeamMapRemoval); err != nil {
+			return err
+		}
 	}

+	return nil
+}
+
+func getClaimedGroups(source *oauth2.Source, gothUser *goth.User) container.Set[string] {
 	groupClaims, has := gothUser.RawData[source.GroupClaimName]
 	if !has {
-		return false
+		return nil
 	}

-	groups := claimValueToStringSlice(groupClaims)
+	return claimValueToStringSet(groupClaims)
+}
+
+func setUserAdminAndRestrictedFromGroupClaims(source *oauth2.Source, u *user_model.User, gothUser *goth.User) bool {
+	groups := getClaimedGroups(source, gothUser)

 	wasAdmin, wasRestricted := u.IsAdmin, u.IsRestricted

 	if source.AdminGroup != "" {
-		u.IsAdmin = false
+		u.IsAdmin = groups.Contains(source.AdminGroup)
 	}
 	if source.RestrictedGroup != "" {
-		u.IsRestricted = false
-	}
-
-	for _, g := range groups {
-		if source.AdminGroup != "" && g == source.AdminGroup {
-			u.IsAdmin = true
-		} else if source.RestrictedGroup != "" && g == source.RestrictedGroup {
-			u.IsRestricted = true
-		}
+		u.IsRestricted = groups.Contains(source.RestrictedGroup)
 	}

 	return wasAdmin != u.IsAdmin || wasRestricted != u.IsRestricted
@ -1070,6 +1088,15 @@ func handleOAuth2SignIn(ctx *context.Context, source *auth.Source, u *user_model
 		needs2FA = err == nil
 	}

+	oauth2Source := source.Cfg.(*oauth2.Source)
+	groupTeamMapping, err := auth_module.UnmarshalGroupTeamMapping(oauth2Source.GroupTeamMap)
+	if err != nil {
+		ctx.ServerError("UnmarshalGroupTeamMapping", err)
+		return
+	}
+
+	groups := getClaimedGroups(oauth2Source, &gothUser)
+
 	// If this user is enrolled in 2FA and this source doesn't override it,
 	// we can't sign the user in just yet. Instead, redirect them to the 2FA authentication page.
 	if !needs2FA {
@ -1088,7 +1115,7 @@ func handleOAuth2SignIn(ctx *context.Context, source *auth.Source, u *user_model
 		u.SetLastLogin()

 		// Update GroupClaims
-		changed := setUserGroupClaims(source, u, &gothUser)
+		changed := setUserAdminAndRestrictedFromGroupClaims(oauth2Source, u, &gothUser)
 		cols := []string{"last_login_unix"}
 		if changed {
 			cols = append(cols, "is_admin", "is_restricted")
@ -1099,6 +1126,13 @@ func handleOAuth2SignIn(ctx *context.Context, source *auth.Source, u *user_model
 			return
 		}

+		if oauth2Source.GroupTeamMap != "" || oauth2Source.GroupTeamMapRemoval {
+			if err := source_service.SyncGroupsToTeams(ctx, u, groups, groupTeamMapping, oauth2Source.GroupTeamMapRemoval); err != nil {
+				ctx.ServerError("SyncGroupsToTeams", err)
+				return
+			}
+		}
+
 		// update external user information
 		if err := externalaccount.UpdateExternalUser(u, gothUser); err != nil {
 			if !errors.Is(err, util.ErrNotExist) {
@ -1121,7 +1155,7 @@ func handleOAuth2SignIn(ctx *context.Context, source *auth.Source, u *user_model
 		return
 	}

-	changed := setUserGroupClaims(source, u, &gothUser)
+	changed := setUserAdminAndRestrictedFromGroupClaims(oauth2Source, u, &gothUser)
 	if changed {
 		if err := user_model.UpdateUserCols(ctx, u, "is_admin", "is_restricted"); err != nil {
 			ctx.ServerError("UpdateUserCols", err)
@ -1129,6 +1163,13 @@ func handleOAuth2SignIn(ctx *context.Context, source *auth.Source, u *user_model
 		}
 	}

+	if oauth2Source.GroupTeamMap != "" || oauth2Source.GroupTeamMapRemoval {
+		if err := source_service.SyncGroupsToTeams(ctx, u, groups, groupTeamMapping, oauth2Source.GroupTeamMapRemoval); err != nil {
+			ctx.ServerError("SyncGroupsToTeams", err)
+			return
+		}
+	}
+
 	if err := updateSession(ctx, nil, map[string]interface{}{
 		// User needs to use 2FA, save data and redirect to 2FA page.
 		"twofaUid":      u.ID,
@ -1188,15 +1229,9 @@ func oAuth2UserLoginCallback(authSource *auth.Source, request *http.Request, res
 		}

 		if oauth2Source.RequiredClaimValue != "" {
-			groups := claimValueToStringSlice(claimInterface)
-			found := false
-			for _, group := range groups {
-				if group == oauth2Source.RequiredClaimValue {
-					found = true
-					break
-				}
-			}
-			if !found {
+			groups := claimValueToStringSet(claimInterface)
+
+			if !groups.Contains(oauth2Source.RequiredClaimValue) {
 				return nil, goth.User{}, user_model.ErrUserProhibitLogin{Name: gothUser.UserID}
 			}
 		}
--- a/routers/web/repo/issue_label.go
+++ b/routers/web/repo/issue_label.go
@ -78,7 +78,7 @@ func RetrieveLabels(ctx *context.Context) {
 		}
 		ctx.Data["OrgLabels"] = orgLabels

-		org, err := organization.GetOrgByName(ctx.Repo.Owner.LowerName)
+		org, err := organization.GetOrgByName(ctx, ctx.Repo.Owner.LowerName)
 		if err != nil {
 			ctx.ServerError("GetOrgByName", err)
 			return
--- a/routers/web/repo/setting.go
+++ b/routers/web/repo/setting.go
@ -1006,7 +1006,7 @@ func AddTeamPost(ctx *context.Context) {
 		return
 	}

-	team, err := organization.OrgFromUser(ctx.Repo.Owner).GetTeam(name)
+	team, err := organization.OrgFromUser(ctx.Repo.Owner).GetTeam(ctx, name)
 	if err != nil {
 		if organization.IsErrTeamNotExist(err) {
 			ctx.Flash.Error(ctx.Tr("form.team_not_exist"))
--- a/routers/web/web.go
+++ b/routers/web/web.go
@ -203,7 +203,7 @@ func Routes(ctx gocontext.Context) *web.Route {
 	}

 	// Get user from session if logged in.
-	common = append(common, context.Auth(group))
+	common = append(common, auth_service.Auth(group))

 	// GetHead allows a HEAD request redirect to GET if HEAD method is not defined for that route
 	common = append(common, middleware.GetHead)
--- a/services/auth/middleware.go
+++ b/services/auth/middleware.go
@ -0,0 +1,60 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package auth
+
+import (
+	"net/http"
+
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/web/middleware"
+)
+
+// Auth is a middleware to authenticate a web user
+func Auth(authMethod Method) func(*context.Context) {
+	return func(ctx *context.Context) {
+		if err := authShared(ctx, authMethod); err != nil {
+			log.Error("Failed to verify user: %v", err)
+			ctx.Error(http.StatusUnauthorized, "Verify")
+			return
+		}
+		if ctx.Doer == nil {
+			// ensure the session uid is deleted
+			_ = ctx.Session.Delete("uid")
+		}
+	}
+}
+
+// APIAuth is a middleware to authenticate an api user
+func APIAuth(authMethod Method) func(*context.APIContext) {
+	return func(ctx *context.APIContext) {
+		if err := authShared(ctx.Context, authMethod); err != nil {
+			ctx.Error(http.StatusUnauthorized, "APIAuth", err)
+		}
+	}
+}
+
+func authShared(ctx *context.Context, authMethod Method) error {
+	var err error
+	ctx.Doer, err = authMethod.Verify(ctx.Req, ctx.Resp, ctx, ctx.Session)
+	if err != nil {
+		return err
+	}
+	if ctx.Doer != nil {
+		if ctx.Locale.Language() != ctx.Doer.Language {
+			ctx.Locale = middleware.Locale(ctx.Resp, ctx.Req)
+		}
+		ctx.IsBasicAuth = ctx.Data["AuthedMethod"].(string) == BasicMethodName
+		ctx.IsSigned = true
+		ctx.Data["IsSigned"] = ctx.IsSigned
+		ctx.Data["SignedUser"] = ctx.Doer
+		ctx.Data["SignedUserID"] = ctx.Doer.ID
+		ctx.Data["SignedUserName"] = ctx.Doer.Name
+		ctx.Data["IsAdmin"] = ctx.Doer.IsAdmin
+	} else {
+		ctx.Data["SignedUserID"] = int64(0)
+		ctx.Data["SignedUserName"] = ""
+	}
+	return nil
+}
--- a/services/auth/source/ldap/source_authenticate.go
+++ b/services/auth/source/ldap/source_authenticate.go
@ -10,9 +10,10 @@ import (
 	asymkey_model "code.gitea.io/gitea/models/asymkey"
 	"code.gitea.io/gitea/models/auth"
 	"code.gitea.io/gitea/models/db"
-	"code.gitea.io/gitea/models/organization"
 	user_model "code.gitea.io/gitea/models/user"
+	auth_module "code.gitea.io/gitea/modules/auth"
 	"code.gitea.io/gitea/modules/util"
+	source_service "code.gitea.io/gitea/services/auth/source"
 	"code.gitea.io/gitea/services/mailer"
 	user_service "code.gitea.io/gitea/services/user"
 )
@ -64,61 +65,66 @@ func (source *Source) Authenticate(user *user_model.User, userName, password str
 	}

 	if user != nil {
-		if source.GroupsEnabled && (source.GroupTeamMap != "" || source.GroupTeamMapRemoval) {
-			orgCache := make(map[string]*organization.Organization)
-			teamCache := make(map[string]*organization.Team)
-			source.SyncLdapGroupsToTeams(user, sr.LdapTeamAdd, sr.LdapTeamRemove, orgCache, teamCache)
-		}
 		if isAttributeSSHPublicKeySet && asymkey_model.SynchronizePublicKeys(user, source.authSource, sr.SSHPublicKey) {
-			return user, asymkey_model.RewriteAllPublicKeys()
+			if err := asymkey_model.RewriteAllPublicKeys(); err != nil {
+				return user, err
+			}
+		}
+	} else {
+		// Fallback.
+		if len(sr.Username) == 0 {
+			sr.Username = userName
+		}
+
+		if len(sr.Mail) == 0 {
+			sr.Mail = fmt.Sprintf("%s@localhost", sr.Username)
+		}
+
+		user = &user_model.User{
+			LowerName:   strings.ToLower(sr.Username),
+			Name:        sr.Username,
+			FullName:    composeFullName(sr.Name, sr.Surname, sr.Username),
+			Email:       sr.Mail,
+			LoginType:   source.authSource.Type,
+			LoginSource: source.authSource.ID,
+			LoginName:   userName,
+			IsAdmin:     sr.IsAdmin,
+		}
+		overwriteDefault := &user_model.CreateUserOverwriteOptions{
+			IsRestricted: util.OptionalBoolOf(sr.IsRestricted),
+			IsActive:     util.OptionalBoolTrue,
+		}
+
+		err := user_model.CreateUser(user, overwriteDefault)
+		if err != nil {
+			return user, err
+		}
+
+		mailer.SendRegisterNotifyMail(user)
+
+		if isAttributeSSHPublicKeySet && asymkey_model.AddPublicKeysBySource(user, source.authSource, sr.SSHPublicKey) {
+			if err := asymkey_model.RewriteAllPublicKeys(); err != nil {
+				return user, err
+			}
+		}
+		if len(source.AttributeAvatar) > 0 {
+			if err := user_service.UploadAvatar(user, sr.Avatar); err != nil {
+				return user, err
+			}
 		}
-		return user, nil
 	}

-	// Fallback.
-	if len(sr.Username) == 0 {
-		sr.Username = userName
-	}
-
-	if len(sr.Mail) == 0 {
-		sr.Mail = fmt.Sprintf("%s@localhost", sr.Username)
-	}
-
-	user = &user_model.User{
-		LowerName:   strings.ToLower(sr.Username),
-		Name:        sr.Username,
-		FullName:    composeFullName(sr.Name, sr.Surname, sr.Username),
-		Email:       sr.Mail,
-		LoginType:   source.authSource.Type,
-		LoginSource: source.authSource.ID,
-		LoginName:   userName,
-		IsAdmin:     sr.IsAdmin,
-	}
-	overwriteDefault := &user_model.CreateUserOverwriteOptions{
-		IsRestricted: util.OptionalBoolOf(sr.IsRestricted),
-		IsActive:     util.OptionalBoolTrue,
-	}
-
-	err := user_model.CreateUser(user, overwriteDefault)
-	if err != nil {
-		return user, err
-	}
-
-	mailer.SendRegisterNotifyMail(user)
-
-	if isAttributeSSHPublicKeySet && asymkey_model.AddPublicKeysBySource(user, source.authSource, sr.SSHPublicKey) {
-		err = asymkey_model.RewriteAllPublicKeys()
-	}
-	if err == nil && len(source.AttributeAvatar) > 0 {
-		_ = user_service.UploadAvatar(user, sr.Avatar)
-	}
 	if source.GroupsEnabled && (source.GroupTeamMap != "" || source.GroupTeamMapRemoval) {
-		orgCache := make(map[string]*organization.Organization)
-		teamCache := make(map[string]*organization.Team)
-		source.SyncLdapGroupsToTeams(user, sr.LdapTeamAdd, sr.LdapTeamRemove, orgCache, teamCache)
+		groupTeamMapping, err := auth_module.UnmarshalGroupTeamMapping(source.GroupTeamMap)
+		if err != nil {
+			return user, err
+		}
+		if err := source_service.SyncGroupsToTeams(db.DefaultContext, user, sr.Groups, groupTeamMapping, source.GroupTeamMapRemoval); err != nil {
+			return user, err
+		}
 	}

-	return user, err
+	return user, nil
 }

 // IsSkipLocalTwoFA returns if this source should skip local 2fa for password authentication
--- a/services/auth/source/ldap/source_group_sync.go
+++ b/services/auth/source/ldap/source_group_sync.go
@ -1,94 +0,0 @@
-// Copyright 2021 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-package ldap
-
-import (
-	"code.gitea.io/gitea/models"
-	"code.gitea.io/gitea/models/db"
-	"code.gitea.io/gitea/models/organization"
-	user_model "code.gitea.io/gitea/models/user"
-	"code.gitea.io/gitea/modules/log"
-)
-
-// SyncLdapGroupsToTeams maps LDAP groups to organization and team memberships
-func (source *Source) SyncLdapGroupsToTeams(user *user_model.User, ldapTeamAdd, ldapTeamRemove map[string][]string, orgCache map[string]*organization.Organization, teamCache map[string]*organization.Team) {
-	var err error
-	if source.GroupsEnabled && source.GroupTeamMapRemoval {
-		// when the user is not a member of configs LDAP group, remove mapped organizations/teams memberships
-		removeMappedMemberships(user, ldapTeamRemove, orgCache, teamCache)
-	}
-	for orgName, teamNames := range ldapTeamAdd {
-		org, ok := orgCache[orgName]
-		if !ok {
-			org, err = organization.GetOrgByName(orgName)
-			if err != nil {
-				// organization must be created before LDAP group sync
-				log.Warn("LDAP group sync: Could not find organisation %s: %v", orgName, err)
-				continue
-			}
-			orgCache[orgName] = org
-		}
-
-		for _, teamName := range teamNames {
-			team, ok := teamCache[orgName+teamName]
-			if !ok {
-				team, err = org.GetTeam(teamName)
-				if err != nil {
-					// team must be created before LDAP group sync
-					log.Warn("LDAP group sync: Could not find team %s: %v", teamName, err)
-					continue
-				}
-				teamCache[orgName+teamName] = team
-			}
-			if isMember, err := organization.IsTeamMember(db.DefaultContext, org.ID, team.ID, user.ID); !isMember && err == nil {
-				log.Trace("LDAP group sync: adding user [%s] to team [%s]", user.Name, org.Name)
-			} else {
-				continue
-			}
-			err := models.AddTeamMember(team, user.ID)
-			if err != nil {
-				log.Error("LDAP group sync: Could not add user to team: %v", err)
-			}
-		}
-	}
-}
-
-// remove membership to organizations/teams if user is not member of corresponding LDAP group
-// e.g. lets assume user is member of LDAP group "x", but LDAP group team map contains LDAP groups "x" and "y"
-// then users membership gets removed for all organizations/teams mapped by LDAP group "y"
-func removeMappedMemberships(user *user_model.User, ldapTeamRemove map[string][]string, orgCache map[string]*organization.Organization, teamCache map[string]*organization.Team) {
-	var err error
-	for orgName, teamNames := range ldapTeamRemove {
-		org, ok := orgCache[orgName]
-		if !ok {
-			org, err = organization.GetOrgByName(orgName)
-			if err != nil {
-				// organization must be created before LDAP group sync
-				log.Warn("LDAP group sync: Could not find organisation %s: %v", orgName, err)
-				continue
-			}
-			orgCache[orgName] = org
-		}
-		for _, teamName := range teamNames {
-			team, ok := teamCache[orgName+teamName]
-			if !ok {
-				team, err = org.GetTeam(teamName)
-				if err != nil {
-					// team must must be created before LDAP group sync
-					log.Warn("LDAP group sync: Could not find team %s: %v", teamName, err)
-					continue
-				}
-			}
-			if isMember, err := organization.IsTeamMember(db.DefaultContext, org.ID, team.ID, user.ID); isMember && err == nil {
-				log.Trace("LDAP group sync: removing user [%s] from team [%s]", user.Name, org.Name)
-			} else {
-				continue
-			}
-			err = models.RemoveTeamMember(team, user.ID)
-			if err != nil {
-				log.Error("LDAP group sync: Could not remove user from team: %v", err)
-			}
-		}
-	}
-}
--- a/services/auth/source/ldap/source_search.go
+++ b/services/auth/source/ldap/source_search.go
@ -11,26 +11,24 @@ import (
 	"strconv"
 	"strings"

-	"code.gitea.io/gitea/modules/json"
+	"code.gitea.io/gitea/modules/container"
 	"code.gitea.io/gitea/modules/log"
-	"code.gitea.io/gitea/modules/util"

 	"github.com/go-ldap/ldap/v3"
 )

 // SearchResult : user data
 type SearchResult struct {
-	Username       string   // Username
-	Name           string   // Name
-	Surname        string   // Surname
-	Mail           string   // E-mail address
-	SSHPublicKey   []string // SSH Public Key
-	IsAdmin        bool     // if user is administrator
-	IsRestricted   bool     // if user is restricted
-	LowerName      string   // LowerName
-	Avatar         []byte
-	LdapTeamAdd    map[string][]string // organizations teams to add
-	LdapTeamRemove map[string][]string // organizations teams to remove
+	Username     string   // Username
+	Name         string   // Name
+	Surname      string   // Surname
+	Mail         string   // E-mail address
+	SSHPublicKey []string // SSH Public Key
+	IsAdmin      bool     // if user is administrator
+	IsRestricted bool     // if user is restricted
+	LowerName    string   // LowerName
+	Avatar       []byte
+	Groups       container.Set[string]
 }

 func (source *Source) sanitizedUserQuery(username string) (string, bool) {
@ -196,9 +194,8 @@ func checkRestricted(l *ldap.Conn, ls *Source, userDN string) bool {
 }

 // List all group memberships of a user
-func (source *Source) listLdapGroupMemberships(l *ldap.Conn, uid string, applyGroupFilter bool) []string {
-	var ldapGroups []string
-	var searchFilter string
+func (source *Source) listLdapGroupMemberships(l *ldap.Conn, uid string, applyGroupFilter bool) container.Set[string] {
+	ldapGroups := make(container.Set[string])

 	groupFilter, ok := source.sanitizedGroupFilter(source.GroupFilter)
 	if !ok {
@ -210,12 +207,12 @@ func (source *Source) listLdapGroupMemberships(l *ldap.Conn, uid string, applyGr
 		return ldapGroups
 	}

+	var searchFilter string
 	if applyGroupFilter {
 		searchFilter = fmt.Sprintf("(&(%s)(%s=%s))", groupFilter, source.GroupMemberUID, ldap.EscapeFilter(uid))
 	} else {
 		searchFilter = fmt.Sprintf("(%s=%s)", source.GroupMemberUID, ldap.EscapeFilter(uid))
 	}
-
 	result, err := l.Search(ldap.NewSearchRequest(
 		groupDN,
 		ldap.ScopeWholeSubtree,
@ -237,44 +234,12 @@ func (source *Source) listLdapGroupMemberships(l *ldap.Conn, uid string, applyGr
 			log.Error("LDAP search was successful, but found no DN!")
 			continue
 		}
-		ldapGroups = append(ldapGroups, entry.DN)
+		ldapGroups.Add(entry.DN)
 	}

 	return ldapGroups
 }

-// parse LDAP groups and return map of ldap groups to organizations teams
-func (source *Source) mapLdapGroupsToTeams() map[string]map[string][]string {
-	ldapGroupsToTeams := make(map[string]map[string][]string)
-	err := json.Unmarshal([]byte(source.GroupTeamMap), &ldapGroupsToTeams)
-	if err != nil {
-		log.Error("Failed to unmarshall LDAP teams map: %v", err)
-		return ldapGroupsToTeams
-	}
-	return ldapGroupsToTeams
-}
-
-// getMappedMemberships : returns the organizations and teams to modify the users membership
-func (source *Source) getMappedMemberships(usersLdapGroups []string, uid string) (map[string][]string, map[string][]string) {
-	// unmarshall LDAP group team map from configs
-	ldapGroupsToTeams := source.mapLdapGroupsToTeams()
-	membershipsToAdd := map[string][]string{}
-	membershipsToRemove := map[string][]string{}
-	for group, memberships := range ldapGroupsToTeams {
-		isUserInGroup := util.SliceContainsString(usersLdapGroups, group)
-		if isUserInGroup {
-			for org, teams := range memberships {
-				membershipsToAdd[org] = teams
-			}
-		} else if !isUserInGroup {
-			for org, teams := range memberships {
-				membershipsToRemove[org] = teams
-			}
-		}
-	}
-	return membershipsToAdd, membershipsToRemove
-}
-
 func (source *Source) getUserAttributeListedInGroup(entry *ldap.Entry) string {
 	if strings.ToLower(source.UserUID) == "dn" {
 		return entry.DN
@ -399,23 +364,6 @@ func (source *Source) SearchEntry(name, passwd string, directBind bool) *SearchR
 	surname := sr.Entries[0].GetAttributeValue(source.AttributeSurname)
 	mail := sr.Entries[0].GetAttributeValue(source.AttributeMail)

-	teamsToAdd := make(map[string][]string)
-	teamsToRemove := make(map[string][]string)
-
-	// Check group membership
-	if source.GroupsEnabled {
-		userAttributeListedInGroup := source.getUserAttributeListedInGroup(sr.Entries[0])
-		usersLdapGroups := source.listLdapGroupMemberships(l, userAttributeListedInGroup, true)
-
-		if source.GroupFilter != "" && len(usersLdapGroups) == 0 {
-			return nil
-		}
-
-		if source.GroupTeamMap != "" || source.GroupTeamMapRemoval {
-			teamsToAdd, teamsToRemove = source.getMappedMemberships(usersLdapGroups, userAttributeListedInGroup)
-		}
-	}
-
 	if isAttributeSSHPublicKeySet {
 		sshPublicKey = sr.Entries[0].GetAttributeValues(source.AttributeSSHPublicKey)
 	}
@ -431,6 +379,17 @@ func (source *Source) SearchEntry(name, passwd string, directBind bool) *SearchR
 		Avatar = sr.Entries[0].GetRawAttributeValue(source.AttributeAvatar)
 	}

+	// Check group membership
+	var usersLdapGroups container.Set[string]
+	if source.GroupsEnabled {
+		userAttributeListedInGroup := source.getUserAttributeListedInGroup(sr.Entries[0])
+		usersLdapGroups = source.listLdapGroupMemberships(l, userAttributeListedInGroup, true)
+
+		if source.GroupFilter != "" && len(usersLdapGroups) == 0 {
+			return nil
+		}
+	}
+
 	if !directBind && source.AttributesInBind {
 		// binds user (checking password) after looking-up attributes in BindDN context
 		err = bindUser(l, userDN, passwd)
@ -440,17 +399,16 @@ func (source *Source) SearchEntry(name, passwd string, directBind bool) *SearchR
 	}

 	return &SearchResult{
-		LowerName:      strings.ToLower(username),
-		Username:       username,
-		Name:           firstname,
-		Surname:        surname,
-		Mail:           mail,
-		SSHPublicKey:   sshPublicKey,
-		IsAdmin:        isAdmin,
-		IsRestricted:   isRestricted,
-		Avatar:         Avatar,
-		LdapTeamAdd:    teamsToAdd,
-		LdapTeamRemove: teamsToRemove,
+		LowerName:    strings.ToLower(username),
+		Username:     username,
+		Name:         firstname,
+		Surname:      surname,
+		Mail:         mail,
+		SSHPublicKey: sshPublicKey,
+		IsAdmin:      isAdmin,
+		IsRestricted: isRestricted,
+		Avatar:       Avatar,
+		Groups:       usersLdapGroups,
 	}
 }

@ -512,33 +470,29 @@ func (source *Source) SearchEntries() ([]*SearchResult, error) {
 	result := make([]*SearchResult, 0, len(sr.Entries))

 	for _, v := range sr.Entries {
-		teamsToAdd := make(map[string][]string)
-		teamsToRemove := make(map[string][]string)
-
+		var usersLdapGroups container.Set[string]
 		if source.GroupsEnabled {
 			userAttributeListedInGroup := source.getUserAttributeListedInGroup(v)

 			if source.GroupFilter != "" {
-				usersLdapGroups := source.listLdapGroupMemberships(l, userAttributeListedInGroup, true)
+				usersLdapGroups = source.listLdapGroupMemberships(l, userAttributeListedInGroup, true)
 				if len(usersLdapGroups) == 0 {
 					continue
 				}
 			}

 			if source.GroupTeamMap != "" || source.GroupTeamMapRemoval {
-				usersLdapGroups := source.listLdapGroupMemberships(l, userAttributeListedInGroup, false)
-				teamsToAdd, teamsToRemove = source.getMappedMemberships(usersLdapGroups, userAttributeListedInGroup)
+				usersLdapGroups = source.listLdapGroupMemberships(l, userAttributeListedInGroup, false)
 			}
 		}

 		user := &SearchResult{
-			Username:       v.GetAttributeValue(source.AttributeUsername),
-			Name:           v.GetAttributeValue(source.AttributeName),
-			Surname:        v.GetAttributeValue(source.AttributeSurname),
-			Mail:           v.GetAttributeValue(source.AttributeMail),
-			IsAdmin:        checkAdmin(l, source, v.DN),
-			LdapTeamAdd:    teamsToAdd,
-			LdapTeamRemove: teamsToRemove,
+			Username: v.GetAttributeValue(source.AttributeUsername),
+			Name:     v.GetAttributeValue(source.AttributeName),
+			Surname:  v.GetAttributeValue(source.AttributeSurname),
+			Mail:     v.GetAttributeValue(source.AttributeMail),
+			IsAdmin:  checkAdmin(l, source, v.DN),
+			Groups:   usersLdapGroups,
 		}

 		if !user.IsAdmin {
--- a/services/auth/source/ldap/source_sync.go
+++ b/services/auth/source/ldap/source_sync.go
@ -13,8 +13,10 @@ import (
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/models/organization"
 	user_model "code.gitea.io/gitea/models/user"
+	auth_module "code.gitea.io/gitea/modules/auth"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/util"
+	source_service "code.gitea.io/gitea/services/auth/source"
 	user_service "code.gitea.io/gitea/services/user"
 )

@ -65,6 +67,11 @@ func (source *Source) Sync(ctx context.Context, updateExisting bool) error {
 	orgCache := make(map[string]*organization.Organization)
 	teamCache := make(map[string]*organization.Team)

+	groupTeamMapping, err := auth_module.UnmarshalGroupTeamMapping(source.GroupTeamMap)
+	if err != nil {
+		return err
+	}
+
 	for _, su := range sr {
 		select {
 		case <-ctx.Done():
@ -173,7 +180,9 @@ func (source *Source) Sync(ctx context.Context, updateExisting bool) error {
 		}
 		// Synchronize LDAP groups with organization and team memberships
 		if source.GroupsEnabled && (source.GroupTeamMap != "" || source.GroupTeamMapRemoval) {
-			source.SyncLdapGroupsToTeams(usr, su.LdapTeamAdd, su.LdapTeamRemove, orgCache, teamCache)
+			if err := source_service.SyncGroupsToTeamsCached(ctx, usr, su.Groups, groupTeamMapping, source.GroupTeamMapRemoval, orgCache, teamCache); err != nil {
+				log.Error("SyncGroupsToTeamsCached: %v", err)
+			}
 		}
 	}

--- a/services/auth/source/oauth2/source.go
+++ b/services/auth/source/oauth2/source.go
@ -8,13 +8,6 @@ import (
 	"code.gitea.io/gitea/modules/json"
 )

-// ________      _____          __  .__     ________
-// \_____  \    /  _  \  __ ___/  |_|  |__  \_____  \
-// /   |   \  /  /_\  \|  |  \   __\  |  \  /  ____/
-// /    |    \/    |    \  |  /|  | |   Y  \/       \
-// \_______  /\____|__  /____/ |__| |___|  /\_______ \
-//         \/         \/                 \/         \/
-
 // Source holds configuration for the OAuth2 login source.
 type Source struct {
 	Provider                      string
@ -24,13 +17,15 @@ type Source struct {
 	CustomURLMapping              *CustomURLMapping
 	IconURL                       string

-	Scopes             []string
-	RequiredClaimName  string
-	RequiredClaimValue string
-	GroupClaimName     string
-	AdminGroup         string
-	RestrictedGroup    string
-	SkipLocalTwoFA     bool `json:",omitempty"`
+	Scopes              []string
+	RequiredClaimName   string
+	RequiredClaimValue  string
+	GroupClaimName      string
+	AdminGroup          string
+	GroupTeamMap        string
+	GroupTeamMapRemoval bool
+	RestrictedGroup     string
+	SkipLocalTwoFA      bool `json:",omitempty"`

 	// reference to the authSource
 	authSource *auth.Source
--- a/services/auth/source/source_group_sync.go
+++ b/services/auth/source/source_group_sync.go
@ -0,0 +1,116 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package source
+
+import (
+	"context"
+	"fmt"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/models/organization"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/container"
+	"code.gitea.io/gitea/modules/log"
+)
+
+type syncType int
+
+const (
+	syncAdd syncType = iota
+	syncRemove
+)
+
+// SyncGroupsToTeams maps authentication source groups to organization and team memberships
+func SyncGroupsToTeams(ctx context.Context, user *user_model.User, sourceUserGroups container.Set[string], sourceGroupTeamMapping map[string]map[string][]string, performRemoval bool) error {
+	orgCache := make(map[string]*organization.Organization)
+	teamCache := make(map[string]*organization.Team)
+	return SyncGroupsToTeamsCached(ctx, user, sourceUserGroups, sourceGroupTeamMapping, performRemoval, orgCache, teamCache)
+}
+
+// SyncGroupsToTeamsCached maps authentication source groups to organization and team memberships
+func SyncGroupsToTeamsCached(ctx context.Context, user *user_model.User, sourceUserGroups container.Set[string], sourceGroupTeamMapping map[string]map[string][]string, performRemoval bool, orgCache map[string]*organization.Organization, teamCache map[string]*organization.Team) error {
+	membershipsToAdd, membershipsToRemove := resolveMappedMemberships(sourceUserGroups, sourceGroupTeamMapping)
+
+	if performRemoval {
+		if err := syncGroupsToTeamsCached(ctx, user, membershipsToRemove, syncRemove, orgCache, teamCache); err != nil {
+			return fmt.Errorf("could not sync[remove] user groups: %w", err)
+		}
+	}
+
+	if err := syncGroupsToTeamsCached(ctx, user, membershipsToAdd, syncAdd, orgCache, teamCache); err != nil {
+		return fmt.Errorf("could not sync[add] user groups: %w", err)
+	}
+
+	return nil
+}
+
+func resolveMappedMemberships(sourceUserGroups container.Set[string], sourceGroupTeamMapping map[string]map[string][]string) (map[string][]string, map[string][]string) {
+	membershipsToAdd := map[string][]string{}
+	membershipsToRemove := map[string][]string{}
+	for group, memberships := range sourceGroupTeamMapping {
+		isUserInGroup := sourceUserGroups.Contains(group)
+		if isUserInGroup {
+			for org, teams := range memberships {
+				membershipsToAdd[org] = teams
+			}
+		} else {
+			for org, teams := range memberships {
+				membershipsToRemove[org] = teams
+			}
+		}
+	}
+	return membershipsToAdd, membershipsToRemove
+}
+
+func syncGroupsToTeamsCached(ctx context.Context, user *user_model.User, orgTeamMap map[string][]string, action syncType, orgCache map[string]*organization.Organization, teamCache map[string]*organization.Team) error {
+	for orgName, teamNames := range orgTeamMap {
+		var err error
+		org, ok := orgCache[orgName]
+		if !ok {
+			org, err = organization.GetOrgByName(ctx, orgName)
+			if err != nil {
+				if organization.IsErrOrgNotExist(err) {
+					// organization must be created before group sync
+					log.Warn("group sync: Could not find organisation %s: %v", orgName, err)
+					continue
+				}
+				return err
+			}
+			orgCache[orgName] = org
+		}
+		for _, teamName := range teamNames {
+			team, ok := teamCache[orgName+teamName]
+			if !ok {
+				team, err = org.GetTeam(ctx, teamName)
+				if err != nil {
+					if organization.IsErrTeamNotExist(err) {
+						// team must be created before group sync
+						log.Warn("group sync: Could not find team %s: %v", teamName, err)
+						continue
+					}
+					return err
+				}
+				teamCache[orgName+teamName] = team
+			}
+
+			isMember, err := organization.IsTeamMember(ctx, org.ID, team.ID, user.ID)
+			if err != nil {
+				return err
+			}
+
+			if action == syncAdd && !isMember {
+				if err := models.AddTeamMember(team, user.ID); err != nil {
+					log.Error("group sync: Could not add user to team: %v", err)
+					return err
+				}
+			} else if action == syncRemove && isMember {
+				if err := models.RemoveTeamMember(team, user.ID); err != nil {
+					log.Error("group sync: Could not remove user from team: %v", err)
+					return err
+				}
+			}
+		}
+	}
+	return nil
+}
--- a/services/forms/auth_form.go
+++ b/services/forms/auth_form.go
@ -72,13 +72,15 @@ type AuthenticationForm struct {
 	Oauth2GroupClaimName          string
 	Oauth2AdminGroup              string
 	Oauth2RestrictedGroup         string
+	Oauth2GroupTeamMap            string `binding:"ValidGroupTeamMap"`
+	Oauth2GroupTeamMapRemoval     bool
 	SkipLocalTwoFA                bool
 	SSPIAutoCreateUsers           bool
 	SSPIAutoActivateUsers         bool
 	SSPIStripDomainNames          bool
 	SSPISeparatorReplacement      string `binding:"AlphaDashDot;MaxSize(5)"`
 	SSPIDefaultLanguage           string
-	GroupTeamMap                  string
+	GroupTeamMap                  string `binding:"ValidGroupTeamMap"`
 	GroupTeamMapRemoval           bool
 }

--- a/templates/admin/auth/edit.tmpl
+++ b/templates/admin/auth/edit.tmpl
@ -361,6 +361,14 @@
 						<label for="oauth2_restricted_group">{{.locale.Tr "admin.auths.oauth2_restricted_group"}}</label>
 						<input id="oauth2_restricted_group" name="oauth2_restricted_group" value="{{$cfg.RestrictedGroup}}">
 					</div>
+					<div class="field">
+						<label>{{.locale.Tr "admin.auths.oauth2_map_group_to_team"}}</label>
+						<input name="oauth2_group_team_map" value="{{$cfg.GroupTeamMap}}" placeholder='e.g. {"Developer": {"MyGiteaOrganization": ["MyGiteaTeam1", "MyGiteaTeam2"]}}'>
+					</div>
+					<div class="ui checkbox">
+						<label>{{.locale.Tr "admin.auths.oauth2_map_group_to_team_removal"}}</label>
+						<input name="oauth2_group_team_map_removal" type="checkbox" {{if $cfg.GroupTeamMapRemoval}}checked{{end}}>
+					</div>
 				{{end}}

 				<!-- SSPI -->
--- a/templates/admin/auth/source/ldap.tmpl
+++ b/templates/admin/auth/source/ldap.tmpl
@ -52,7 +52,7 @@
 	</div>
 	<div class="field">
 		<label for="restricted_filter">{{.locale.Tr "admin.auths.restricted_filter"}}</label>
-		<input id="restricted_filter" name="admin_filter" value="{{.restricted_filter}}">
+		<input id="restricted_filter" name="restricted_filter" value="{{.restricted_filter}}">
 		<p class="help">{{.locale.Tr "admin.auths.restricted_filter_helper"}}</p>
 	</div>
 	<div class="field">
--- a/templates/admin/auth/source/oauth.tmpl
+++ b/templates/admin/auth/source/oauth.tmpl
@ -98,4 +98,12 @@
 		<label for="oauth2_restricted_group">{{.locale.Tr "admin.auths.oauth2_restricted_group"}}</label>
 		<input id="oauth2_restricted_group" name="oauth2_restricted_group" value="{{.oauth2_group_claim_name}}">
 	</div>
+	<div class="field">
+		<label>{{.locale.Tr "admin.auths.oauth2_map_group_to_team"}}</label>
+		<input name="oauth2_group_team_map" value="{{.group_team_map}}" placeholder='e.g. {"Developer": {"MyGiteaOrganization": ["MyGiteaTeam1", "MyGiteaTeam2"]}}'>
+	</div>
+	<div class="ui checkbox">
+		<label>{{.locale.Tr "admin.auths.oauth2_map_group_to_team_removal"}}</label>
+		<input name="oauth2_group_team_map_removal" type="checkbox" {{if .group_team_map_removal}}checked{{end}}>
+	</div>
 </div>
--- a/tests/integration/auth_ldap_test.go
+++ b/tests/integration/auth_ldap_test.go
@ -112,23 +112,14 @@ func getLDAPServerPort() string {
 	return port
 }

-func addAuthSourceLDAP(t *testing.T, sshKeyAttribute, groupFilter string, groupMapParams ...string) {
-	groupTeamMapRemoval := "off"
-	groupTeamMap := ""
-	if len(groupMapParams) == 2 {
-		groupTeamMapRemoval = groupMapParams[0]
-		groupTeamMap = groupMapParams[1]
-	}
-
+func buildAuthSourceLDAPPayload(csrf, sshKeyAttribute, groupFilter, groupTeamMap, groupTeamMapRemoval string) map[string]string {
 	// Modify user filter to test group filter explicitly
 	userFilter := "(&(objectClass=inetOrgPerson)(memberOf=cn=git,ou=people,dc=planetexpress,dc=com)(uid=%s))"
 	if groupFilter != "" {
 		userFilter = "(&(objectClass=inetOrgPerson)(uid=%s))"
 	}

-	session := loginUser(t, "user1")
-	csrf := GetCSRF(t, session, "/admin/auths/new")
-	req := NewRequestWithValues(t, "POST", "/admin/auths/new", map[string]string{
+	return map[string]string{
 		"_csrf":                    csrf,
 		"type":                     "2",
 		"name":                     "ldap",
@ -154,7 +145,19 @@ func addAuthSourceLDAP(t *testing.T, sshKeyAttribute, groupFilter string, groupM
 		"group_team_map":           groupTeamMap,
 		"group_team_map_removal":   groupTeamMapRemoval,
 		"user_uid":                 "DN",
-	})
+	}
+}
+
+func addAuthSourceLDAP(t *testing.T, sshKeyAttribute, groupFilter string, groupMapParams ...string) {
+	groupTeamMapRemoval := "off"
+	groupTeamMap := ""
+	if len(groupMapParams) == 2 {
+		groupTeamMapRemoval = groupMapParams[0]
+		groupTeamMap = groupMapParams[1]
+	}
+	session := loginUser(t, "user1")
+	csrf := GetCSRF(t, session, "/admin/auths/new")
+	req := NewRequestWithValues(t, "POST", "/admin/auths/new", buildAuthSourceLDAPPayload(csrf, sshKeyAttribute, groupFilter, groupTeamMap, groupTeamMapRemoval))
 	session.MakeRequest(t, req, http.StatusSeeOther)
 }

@ -202,26 +205,7 @@ func TestLDAPAuthChange(t *testing.T) {
 	binddn, _ := doc.Find(`input[name="bind_dn"]`).Attr("value")
 	assert.Equal(t, binddn, "uid=gitea,ou=service,dc=planetexpress,dc=com")

-	req = NewRequestWithValues(t, "POST", href, map[string]string{
-		"_csrf":                    csrf,
-		"type":                     "2",
-		"name":                     "ldap",
-		"host":                     getLDAPServerHost(),
-		"port":                     "389",
-		"bind_dn":                  "uid=gitea,ou=service,dc=planetexpress,dc=com",
-		"bind_password":            "password",
-		"user_base":                "ou=people,dc=planetexpress,dc=com",
-		"filter":                   "(&(objectClass=inetOrgPerson)(memberOf=cn=git,ou=people,dc=planetexpress,dc=com)(uid=%s))",
-		"admin_filter":             "(memberOf=cn=admin_staff,ou=people,dc=planetexpress,dc=com)",
-		"restricted_filter":        "(uid=leela)",
-		"attribute_username":       "uid",
-		"attribute_name":           "givenName",
-		"attribute_surname":        "sn",
-		"attribute_mail":           "mail",
-		"attribute_ssh_public_key": "",
-		"is_sync_enabled":          "on",
-		"is_active":                "on",
-	})
+	req = NewRequestWithValues(t, "POST", href, buildAuthSourceLDAPPayload(csrf, "", "", "", "off"))
 	session.MakeRequest(t, req, http.StatusSeeOther)

 	req = NewRequest(t, "GET", href)
@ -395,7 +379,7 @@ func TestLDAPGroupTeamSyncAddMember(t *testing.T) {
 	}
 	defer tests.PrepareTestEnv(t)()
 	addAuthSourceLDAP(t, "", "", "on", `{"cn=ship_crew,ou=people,dc=planetexpress,dc=com":{"org26": ["team11"]},"cn=admin_staff,ou=people,dc=planetexpress,dc=com": {"non-existent": ["non-existent"]}}`)
-	org, err := organization.GetOrgByName("org26")
+	org, err := organization.GetOrgByName(db.DefaultContext, "org26")
 	assert.NoError(t, err)
 	team, err := organization.GetTeam(db.DefaultContext, org.ID, "team11")
 	assert.NoError(t, err)
@ -440,7 +424,7 @@ func TestLDAPGroupTeamSyncRemoveMember(t *testing.T) {
 	}
 	defer tests.PrepareTestEnv(t)()
 	addAuthSourceLDAP(t, "", "", "on", `{"cn=dispatch,ou=people,dc=planetexpress,dc=com": {"org26": ["team11"]}}`)
-	org, err := organization.GetOrgByName("org26")
+	org, err := organization.GetOrgByName(db.DefaultContext, "org26")
 	assert.NoError(t, err)
 	team, err := organization.GetTeam(db.DefaultContext, org.ID, "team11")
 	assert.NoError(t, err)
@ -468,24 +452,15 @@ func TestLDAPGroupTeamSyncRemoveMember(t *testing.T) {
 	assert.False(t, isMember, "User membership should have been removed from team")
 }

-// Login should work even if Team Group Map contains a broken JSON
-func TestBrokenLDAPMapUserSignin(t *testing.T) {
+func TestLDAPPreventInvalidGroupTeamMap(t *testing.T) {
 	if skipLDAPTests() {
 		t.Skip()
 		return
 	}
 	defer tests.PrepareTestEnv(t)()
-	addAuthSourceLDAP(t, "", "", "on", `{"NOT_A_VALID_JSON"["MISSING_DOUBLE_POINT"]}`)

-	u := gitLDAPUsers[0]
-
-	session := loginUserWithPassword(t, u.UserName, u.Password)
-	req := NewRequest(t, "GET", "/user/settings")
-	resp := session.MakeRequest(t, req, http.StatusOK)
-
-	htmlDoc := NewHTMLParser(t, resp.Body)
-
-	assert.Equal(t, u.UserName, htmlDoc.GetInputValueByName("name"))
-	assert.Equal(t, u.FullName, htmlDoc.GetInputValueByName("full_name"))
-	assert.Equal(t, u.Email, htmlDoc.Find(`label[for="email"]`).Siblings().First().Text())
+	session := loginUser(t, "user1")
+	csrf := GetCSRF(t, session, "/admin/auths/new")
+	req := NewRequestWithValues(t, "POST", "/admin/auths/new", buildAuthSourceLDAPPayload(csrf, "", "", `{"NOT_A_VALID_JSON"["MISSING_DOUBLE_POINT"]}`, "off"))
+	session.MakeRequest(t, req, http.StatusOK) // StatusOK = failed, StatusSeeOther = ok
 }