Refactor OpenIDConnect to support SSH/FullName sync (#34978)

* Fix #26585
* Fix #28327
* Fix #34932

cmd/admin_auth_oauth.go

@@ -87,6 +87,14 @@ func oauthCLIFlags() []cli.Flag {
 			Value: nil,
 			Usage: "Scopes to request when to authenticate against this OAuth2 source",
 		},
+		&cli.StringFlag{
+			Name:  "ssh-public-key-claim-name",
+			Usage: "Claim name that provides SSH public keys",
+		},
+		&cli.StringFlag{
+			Name:  "full-name-claim-name",
+			Usage: "Claim name that provides user's full name",
+		},
 		&cli.StringFlag{
 			Name:  "required-claim-name",
 			Value: "",
@@ -177,6 +185,8 @@ func parseOAuth2Config(c *cli.Command) *oauth2.Source {
 		RestrictedGroup:               c.String("restricted-group"),
 		GroupTeamMap:                  c.String("group-team-map"),
 		GroupTeamMapRemoval:           c.Bool("group-team-map-removal"),
+		SSHPublicKeyClaimName:         c.String("ssh-public-key-claim-name"),
+		FullNameClaimName:             c.String("full-name-claim-name"),
 	}
 }
 
@@ -268,6 +278,12 @@ func (a *authService) runUpdateOauth(ctx context.Context, c *cli.Command) error
 	if c.IsSet("group-team-map-removal") {
 		oAuth2Config.GroupTeamMapRemoval = c.Bool("group-team-map-removal")
 	}
+	if c.IsSet("ssh-public-key-claim-name") {
+		oAuth2Config.SSHPublicKeyClaimName = c.String("ssh-public-key-claim-name")
+	}
+	if c.IsSet("full-name-claim-name") {
+		oAuth2Config.FullNameClaimName = c.String("full-name-claim-name")
+	}
 
 	// update custom URL mapping
 	customURLMapping := &oauth2.CustomURLMapping{}

cmd/admin_auth_oauth_test.go

@@ -88,6 +88,8 @@ func TestAddOauth(t *testing.T) {
 				"--restricted-group", "restricted",
 				"--group-team-map", `{"group1": [1,2]}`,
 				"--group-team-map-removal=true",
+				"--ssh-public-key-claim-name", "attr_ssh_pub_key",
+				"--full-name-claim-name", "attr_full_name",
 			},
 			source: &auth_model.Source{
 				Type:     auth_model.OAuth2,
@@ -113,6 +115,8 @@ func TestAddOauth(t *testing.T) {
 					RestrictedGroup:       "restricted",
 					GroupTeamMap:          `{"group1": [1,2]}`,
 					GroupTeamMapRemoval:   true,
+					SSHPublicKeyClaimName: "attr_ssh_pub_key",
+					FullNameClaimName:     "attr_full_name",
 				},
 				TwoFactorPolicy: "skip",
 			},
@@ -232,6 +236,8 @@ func TestUpdateOauth(t *testing.T) {
 					RestrictedGroup:       "old_restricted",
 					GroupTeamMap:          `{"old_group1": [1,2]}`,
 					GroupTeamMapRemoval:   true,
+					SSHPublicKeyClaimName: "old_ssh_pub_key",
+					FullNameClaimName:     "old_full_name",
 				},
 				TwoFactorPolicy: "",
 			},
@@ -257,6 +263,8 @@ func TestUpdateOauth(t *testing.T) {
 				"--restricted-group", "restricted",
 				"--group-team-map", `{"group1": [1,2]}`,
 				"--group-team-map-removal=false",
+				"--ssh-public-key-claim-name", "new_ssh_pub_key",
+				"--full-name-claim-name", "new_full_name",
 			},
 			authSource: &auth_model.Source{
 				ID:       1,
@@ -283,6 +291,8 @@ func TestUpdateOauth(t *testing.T) {
 					RestrictedGroup:       "restricted",
 					GroupTeamMap:          `{"group1": [1,2]}`,
 					GroupTeamMapRemoval:   false,
+					SSHPublicKeyClaimName: "new_ssh_pub_key",
+					FullNameClaimName:     "new_full_name",
 				},
 				TwoFactorPolicy: "skip",
 			},

models/asymkey/ssh_key.go

@@ -355,13 +355,13 @@ func AddPublicKeysBySource(ctx context.Context, usr *user_model.User, s *auth.So
 	return sshKeysNeedUpdate
 }
 
-// SynchronizePublicKeys updates a users public keys. Returns true if there are changes.
+// SynchronizePublicKeys updates a user's public keys. Returns true if there are changes.
 func SynchronizePublicKeys(ctx context.Context, usr *user_model.User, s *auth.Source, sshPublicKeys []string) bool {
 	var sshKeysNeedUpdate bool
 
 	log.Trace("synchronizePublicKeys[%s]: Handling Public SSH Key synchronization for user %s", s.Name, usr.Name)
 
-	// Get Public Keys from DB with current LDAP source
+	// Get Public Keys from DB with the current auth source
 	var giteaKeys []string
 	keys, err := db.Find[PublicKey](ctx, FindPublicKeyOptions{
 		OwnerID:       usr.ID,

models/auth/oauth2.go

@@ -612,8 +612,8 @@ func (err ErrOAuthApplicationNotFound) Unwrap() error {
 	return util.ErrNotExist
 }
 
-// GetActiveOAuth2SourceByName returns a OAuth2 AuthSource based on the given name
+// GetActiveOAuth2SourceByAuthName returns a OAuth2 AuthSource based on the given name
-func GetActiveOAuth2SourceByName(ctx context.Context, name string) (*Source, error) {
+func GetActiveOAuth2SourceByAuthName(ctx context.Context, name string) (*Source, error) {
 	authSource := new(Source)
 	has, err := db.GetEngine(ctx).Where("name = ? and type = ? and is_active = ?", name, OAuth2, true).Get(authSource)
 	if err != nil {

modules/setting/oauth2.go

@@ -12,7 +12,7 @@ import (
 	"code.gitea.io/gitea/modules/log"
 )
 
-// OAuth2UsernameType is enum describing the way gitea 'name' should be generated from oauth2 data
+// OAuth2UsernameType is enum describing the way gitea generates its 'username' from oauth2 data
 type OAuth2UsernameType string
 
 const (

options/locale/locale_en-US.ini

@@ -3251,6 +3251,8 @@ auths.oauth2_required_claim_name_helper = Set this name to restrict login from t
 auths.oauth2_required_claim_value = Required Claim Value
 auths.oauth2_required_claim_value_helper = Set this value to restrict login from this source to users with a claim with this name and value
 auths.oauth2_group_claim_name = Claim name providing group names for this source. (Optional)
+auths.oauth2_full_name_claim_name = Full Name Claim Name. (Optional, if set, the user's full name will always be synchronized with this claim)
+auths.oauth2_ssh_public_key_claim_name = SSH Public Key Claim Name
 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)

routers/web/admin/auths.go

@@ -199,6 +199,9 @@ func parseOAuth2Config(form forms.AuthenticationForm) *oauth2.Source {
 		AdminGroup:                    form.Oauth2AdminGroup,
 		GroupTeamMap:                  form.Oauth2GroupTeamMap,
 		GroupTeamMapRemoval:           form.Oauth2GroupTeamMapRemoval,
+
+		SSHPublicKeyClaimName: form.Oauth2SSHPublicKeyClaimName,
+		FullNameClaimName:     form.Oauth2FullNameClaimName,
 	}
 }
 

routers/web/auth/2fa.go

@@ -14,7 +14,6 @@ import (
 	"code.gitea.io/gitea/modules/templates"
 	"code.gitea.io/gitea/modules/web"
 	"code.gitea.io/gitea/services/context"
-	"code.gitea.io/gitea/services/externalaccount"
 	"code.gitea.io/gitea/services/forms"
 )
 
@@ -75,7 +74,7 @@ func TwoFactorPost(ctx *context.Context) {
 		}
 
 		if ctx.Session.Get("linkAccount") != nil {
-			err = externalaccount.LinkAccountFromStore(ctx, ctx.Session, u)
+			err = linkAccountFromContext(ctx, u)
 			if err != nil {
 				ctx.ServerError("UserSignIn", err)
 				return

routers/web/auth/auth.go

@@ -329,6 +329,7 @@ func handleSignInFull(ctx *context.Context, u *user_model.User, remember, obeyRe
 		"twofaUid",
 		"twofaRemember",
 		"linkAccount",
+		"linkAccountData",
 	}, map[string]any{
 		session.KeyUID:                  u.ID,
 		session.KeyUname:                u.Name,
@@ -519,7 +520,7 @@ func SignUpPost(ctx *context.Context) {
 		Passwd: form.Password,
 	}
 
-	if !createAndHandleCreatedUser(ctx, tplSignUp, form, u, nil, nil, false) {
+	if !createAndHandleCreatedUser(ctx, tplSignUp, form, u, nil, nil) {
 		// error already handled
 		return
 	}
@@ -530,22 +531,22 @@ func SignUpPost(ctx *context.Context) {
 
 // createAndHandleCreatedUser calls createUserInContext and
 // then handleUserCreated.
-func createAndHandleCreatedUser(ctx *context.Context, tpl templates.TplName, form any, u *user_model.User, overwrites *user_model.CreateUserOverwriteOptions, gothUser *goth.User, allowLink bool) bool {
+func createAndHandleCreatedUser(ctx *context.Context, tpl templates.TplName, form any, u *user_model.User, overwrites *user_model.CreateUserOverwriteOptions, possibleLinkAccountData *LinkAccountData) bool {
-	if !createUserInContext(ctx, tpl, form, u, overwrites, gothUser, allowLink) {
+	if !createUserInContext(ctx, tpl, form, u, overwrites, possibleLinkAccountData) {
 		return false
 	}
-	return handleUserCreated(ctx, u, gothUser)
+	return handleUserCreated(ctx, u, possibleLinkAccountData)
 }
 
 // createUserInContext creates a user and handles errors within a given context.
-// Optionally a template can be specified.
+// Optionally, a template can be specified.
-func createUserInContext(ctx *context.Context, tpl templates.TplName, form any, u *user_model.User, overwrites *user_model.CreateUserOverwriteOptions, gothUser *goth.User, allowLink bool) (ok bool) {
+func createUserInContext(ctx *context.Context, tpl templates.TplName, form any, u *user_model.User, overwrites *user_model.CreateUserOverwriteOptions, possibleLinkAccountData *LinkAccountData) (ok bool) {
 	meta := &user_model.Meta{
 		InitialIP:        ctx.RemoteAddr(),
 		InitialUserAgent: ctx.Req.UserAgent(),
 	}
 	if err := user_model.CreateUser(ctx, u, meta, overwrites); err != nil {
-		if allowLink && (user_model.IsErrUserAlreadyExist(err) || user_model.IsErrEmailAlreadyUsed(err)) {
+		if possibleLinkAccountData != nil && (user_model.IsErrUserAlreadyExist(err) || user_model.IsErrEmailAlreadyUsed(err)) {
 			switch setting.OAuth2Client.AccountLinking {
 			case setting.OAuth2AccountLinkingAuto:
 				var user *user_model.User
@@ -561,15 +562,15 @@ func createUserInContext(ctx *context.Context, tpl templates.TplName, form any,
 				}
 
 				// TODO: probably we should respect 'remember' user's choice...
-				linkAccount(ctx, user, *gothUser, true)
+				oauth2LinkAccount(ctx, user, possibleLinkAccountData, true)
 				return false // user is already created here, all redirects are handled
 			case setting.OAuth2AccountLinkingLogin:
-				showLinkingLogin(ctx, *gothUser)
+				showLinkingLogin(ctx, &possibleLinkAccountData.AuthSource, possibleLinkAccountData.GothUser)
 				return false // user will be created only after linking login
 			}
 		}
 
-		// handle error without template
+		// handle error without a template
 		if len(tpl) == 0 {
 			ctx.ServerError("CreateUser", err)
 			return false
@@ -610,7 +611,7 @@ func createUserInContext(ctx *context.Context, tpl templates.TplName, form any,
 // handleUserCreated does additional steps after a new user is created.
 // It auto-sets admin for the only user, updates the optional external user and
 // sends a confirmation email if required.
-func handleUserCreated(ctx *context.Context, u *user_model.User, gothUser *goth.User) (ok bool) {
+func handleUserCreated(ctx *context.Context, u *user_model.User, possibleLinkAccountData *LinkAccountData) (ok bool) {
 	// Auto-set admin for the only user.
 	hasUsers, err := user_model.HasUsers(ctx)
 	if err != nil {
@@ -631,8 +632,8 @@ func handleUserCreated(ctx *context.Context, u *user_model.User, gothUser *goth.
 	}
 
 	// update external user information
-	if gothUser != nil {
+	if possibleLinkAccountData != nil {
-		if err := externalaccount.EnsureLinkExternalToUser(ctx, u, *gothUser); err != nil {
+		if err := externalaccount.EnsureLinkExternalToUser(ctx, possibleLinkAccountData.AuthSource.ID, u, possibleLinkAccountData.GothUser); err != nil {
 			log.Error("EnsureLinkExternalToUser failed: %v", err)
 		}
 	}

routers/web/auth/linkaccount.go

@@ -5,7 +5,6 @@ package auth
 
 import (
 	"errors"
-	"fmt"
 	"net/http"
 	"strings"
 
@@ -21,8 +20,6 @@ import (
 	"code.gitea.io/gitea/services/context"
 	"code.gitea.io/gitea/services/externalaccount"
 	"code.gitea.io/gitea/services/forms"
-
-	"github.com/markbates/goth"
 )
 
 var tplLinkAccount templates.TplName = "user/auth/link_account"
@@ -52,28 +49,28 @@ func LinkAccount(ctx *context.Context) {
 	ctx.Data["SignInLink"] = setting.AppSubURL + "/user/link_account_signin"
 	ctx.Data["SignUpLink"] = setting.AppSubURL + "/user/link_account_signup"
 
-	gothUser, ok := ctx.Session.Get("linkAccountGothUser").(goth.User)
+	linkAccountData := oauth2GetLinkAccountData(ctx)
 
 	// If you'd like to quickly debug the "link account" page layout, just uncomment the blow line
 	// Don't worry, when the below line exists, the lint won't pass: ineffectual assignment to gothUser (ineffassign)
-	// gothUser, ok = goth.User{Email: "invalid-email", Name: "."}, true // intentionally use invalid data to avoid pass the registration check
+	// linkAccountData = &LinkAccountData{authSource, gothUser} // intentionally use invalid data to avoid pass the registration check
 
-	if !ok {
+	if linkAccountData == nil {
 		// no account in session, so just redirect to the login page, then the user could restart the process
 		ctx.Redirect(setting.AppSubURL + "/user/login")
 		return
 	}
 
-	if missingFields, ok := gothUser.RawData["__giteaAutoRegMissingFields"].([]string); ok {
+	if missingFields, ok := linkAccountData.GothUser.RawData["__giteaAutoRegMissingFields"].([]string); ok {
-		ctx.Data["AutoRegistrationFailedPrompt"] = ctx.Tr("auth.oauth_callback_unable_auto_reg", gothUser.Provider, strings.Join(missingFields, ","))
+		ctx.Data["AutoRegistrationFailedPrompt"] = ctx.Tr("auth.oauth_callback_unable_auto_reg", linkAccountData.GothUser.Provider, strings.Join(missingFields, ","))
 	}
 
-	uname, err := extractUserNameFromOAuth2(&gothUser)
+	uname, err := extractUserNameFromOAuth2(&linkAccountData.GothUser)
 	if err != nil {
 		ctx.ServerError("UserSignIn", err)
 		return
 	}
-	email := gothUser.Email
+	email := linkAccountData.GothUser.Email
 	ctx.Data["user_name"] = uname
 	ctx.Data["email"] = email
 
@@ -152,8 +149,8 @@ func LinkAccountPostSignIn(ctx *context.Context) {
 	ctx.Data["SignInLink"] = setting.AppSubURL + "/user/link_account_signin"
 	ctx.Data["SignUpLink"] = setting.AppSubURL + "/user/link_account_signup"
 
-	gothUser := ctx.Session.Get("linkAccountGothUser")
+	linkAccountData := oauth2GetLinkAccountData(ctx)
-	if gothUser == nil {
+	if linkAccountData == nil {
 		ctx.ServerError("UserSignIn", errors.New("not in LinkAccount session"))
 		return
 	}
@@ -169,11 +166,14 @@ func LinkAccountPostSignIn(ctx *context.Context) {
 		return
 	}
 
-	linkAccount(ctx, u, gothUser.(goth.User), signInForm.Remember)
+	oauth2LinkAccount(ctx, u, linkAccountData, signInForm.Remember)
 }
 
-func linkAccount(ctx *context.Context, u *user_model.User, gothUser goth.User, remember bool) {
+func oauth2LinkAccount(ctx *context.Context, u *user_model.User, linkAccountData *LinkAccountData, remember bool) {
-	updateAvatarIfNeed(ctx, gothUser.AvatarURL, u)
+	oauth2SignInSync(ctx, &linkAccountData.AuthSource, u, linkAccountData.GothUser)
+	if ctx.Written() {
+		return
+	}
 
 	// If this user is enrolled in 2FA, we can't sign the user in just yet.
 	// Instead, redirect them to the 2FA authentication page.
@@ -185,7 +185,7 @@ func linkAccount(ctx *context.Context, u *user_model.User, gothUser goth.User, r
 			return
 		}
 
-		err = externalaccount.LinkAccountToUser(ctx, u, gothUser)
+		err = externalaccount.LinkAccountToUser(ctx, linkAccountData.AuthSource.ID, u, linkAccountData.GothUser)
 		if err != nil {
 			ctx.ServerError("UserLinkAccount", err)
 			return
@@ -243,17 +243,11 @@ func LinkAccountPostRegister(ctx *context.Context) {
 	ctx.Data["SignInLink"] = setting.AppSubURL + "/user/link_account_signin"
 	ctx.Data["SignUpLink"] = setting.AppSubURL + "/user/link_account_signup"
 
-	gothUserInterface := ctx.Session.Get("linkAccountGothUser")
+	linkAccountData := oauth2GetLinkAccountData(ctx)
-	if gothUserInterface == nil {
+	if linkAccountData == nil {
 		ctx.ServerError("UserSignUp", errors.New("not in LinkAccount session"))
 		return
 	}
-	gothUser, ok := gothUserInterface.(goth.User)
-	if !ok {
-		ctx.ServerError("UserSignUp", fmt.Errorf("session linkAccountGothUser type is %t but not goth.User", gothUserInterface))
-		return
-	}
-
 	if ctx.HasError() {
 		ctx.HTML(http.StatusOK, tplLinkAccount)
 		return
@@ -296,31 +290,33 @@ func LinkAccountPostRegister(ctx *context.Context) {
 		}
 	}
 
-	authSource, err := auth.GetActiveOAuth2SourceByName(ctx, gothUser.Provider)
-	if err != nil {
-		ctx.ServerError("CreateUser", err)
-		return
-	}
-
 	u := &user_model.User{
 		Name:        form.UserName,
 		Email:       form.Email,
 		Passwd:      form.Password,
 		LoginType:   auth.OAuth2,
-		LoginSource: authSource.ID,
+		LoginSource: linkAccountData.AuthSource.ID,
-		LoginName:   gothUser.UserID,
+		LoginName:   linkAccountData.GothUser.UserID,
 	}
 
-	if !createAndHandleCreatedUser(ctx, tplLinkAccount, form, u, nil, &gothUser, false) {
+	if !createAndHandleCreatedUser(ctx, tplLinkAccount, form, u, nil, linkAccountData) {
 		// error already handled
 		return
 	}
 
-	source := authSource.Cfg.(*oauth2.Source)
+	source := linkAccountData.AuthSource.Cfg.(*oauth2.Source)
-	if err := syncGroupsToTeams(ctx, source, &gothUser, u); err != nil {
+	if err := syncGroupsToTeams(ctx, source, &linkAccountData.GothUser, u); err != nil {
 		ctx.ServerError("SyncGroupsToTeams", err)
 		return
 	}
 
 	handleSignIn(ctx, u, false)
 }
+
+func linkAccountFromContext(ctx *context.Context, user *user_model.User) error {
+	linkAccountData := oauth2GetLinkAccountData(ctx)
+	if linkAccountData == nil {
+		return errors.New("not in LinkAccount session")
+	}
+	return externalaccount.LinkAccountToUser(ctx, linkAccountData.AuthSource.ID, user, linkAccountData.GothUser)
+}

routers/web/auth/oauth.go

@@ -20,7 +20,6 @@ import (
 	"code.gitea.io/gitea/modules/optional"
 	"code.gitea.io/gitea/modules/session"
 	"code.gitea.io/gitea/modules/setting"
-	"code.gitea.io/gitea/modules/templates"
 	"code.gitea.io/gitea/modules/web/middleware"
 	source_service "code.gitea.io/gitea/services/auth/source"
 	"code.gitea.io/gitea/services/auth/source/oauth2"
@@ -35,9 +34,8 @@ import (
 
 // SignInOAuth handles the OAuth2 login buttons
 func SignInOAuth(ctx *context.Context) {
-	provider := ctx.PathParam("provider")
+	authName := ctx.PathParam("provider")
-
+	authSource, err := auth.GetActiveOAuth2SourceByAuthName(ctx, authName)
-	authSource, err := auth.GetActiveOAuth2SourceByName(ctx, provider)
 	if err != nil {
 		ctx.ServerError("SignIn", err)
 		return
@@ -74,8 +72,6 @@ func SignInOAuth(ctx *context.Context) {
 
 // SignInOAuthCallback handles the callback from the given provider
 func SignInOAuthCallback(ctx *context.Context) {
-	provider := ctx.PathParam("provider")
-
 	if ctx.Req.FormValue("error") != "" {
 		var errorKeyValues []string
 		for k, vv := range ctx.Req.Form {
@@ -88,7 +84,8 @@ func SignInOAuthCallback(ctx *context.Context) {
 	}
 
 	// first look if the provider is still active
-	authSource, err := auth.GetActiveOAuth2SourceByName(ctx, provider)
+	authName := ctx.PathParam("provider")
+	authSource, err := auth.GetActiveOAuth2SourceByAuthName(ctx, authName)
 	if err != nil {
 		ctx.ServerError("SignIn", err)
 		return
@@ -133,7 +130,7 @@ func SignInOAuthCallback(ctx *context.Context) {
 	if u == nil {
 		if ctx.Doer != nil {
 			// attach user to the current signed-in user
-			err = externalaccount.LinkAccountToUser(ctx, ctx.Doer, gothUser)
+			err = externalaccount.LinkAccountToUser(ctx, authSource.ID, ctx.Doer, gothUser)
 			if err != nil {
 				ctx.ServerError("UserLinkAccount", err)
 				return
@@ -174,12 +171,11 @@ func SignInOAuthCallback(ctx *context.Context) {
 					gothUser.RawData = make(map[string]any)
 				}
 				gothUser.RawData["__giteaAutoRegMissingFields"] = missingFields
-				showLinkingLogin(ctx, gothUser)
+				showLinkingLogin(ctx, authSource, gothUser)
 				return
 			}
 			u = &user_model.User{
 				Name:        uname,
-				FullName:    gothUser.Name,
 				Email:       gothUser.Email,
 				LoginType:   auth.OAuth2,
 				LoginSource: authSource.ID,
@@ -196,7 +192,11 @@ func SignInOAuthCallback(ctx *context.Context) {
 			u.IsAdmin = isAdmin.ValueOrDefault(user_service.UpdateOptionField[bool]{FieldValue: false}).FieldValue
 			u.IsRestricted = isRestricted.ValueOrDefault(setting.Service.DefaultUserIsRestricted)
 
-			if !createAndHandleCreatedUser(ctx, templates.TplName(""), nil, u, overwriteDefault, &gothUser, setting.OAuth2Client.AccountLinking != setting.OAuth2AccountLinkingDisabled) {
+			linkAccountData := &LinkAccountData{*authSource, gothUser}
+			if setting.OAuth2Client.AccountLinking == setting.OAuth2AccountLinkingDisabled {
+				linkAccountData = nil
+			}
+			if !createAndHandleCreatedUser(ctx, "", nil, u, overwriteDefault, linkAccountData) {
 				// error already handled
 				return
 			}
@@ -207,7 +207,7 @@ func SignInOAuthCallback(ctx *context.Context) {
 			}
 		} else {
 			// no existing user is found, request attach or new account
-			showLinkingLogin(ctx, gothUser)
+			showLinkingLogin(ctx, authSource, gothUser)
 			return
 		}
 	}
@@ -271,9 +271,22 @@ func getUserAdminAndRestrictedFromGroupClaims(source *oauth2.Source, gothUser *g
 	return isAdmin, isRestricted
 }
 
-func showLinkingLogin(ctx *context.Context, gothUser goth.User) {
+type LinkAccountData struct {
+	AuthSource auth.Source
+	GothUser   goth.User
+}
+
+func oauth2GetLinkAccountData(ctx *context.Context) *LinkAccountData {
+	v, ok := ctx.Session.Get("linkAccountData").(LinkAccountData)
+	if !ok {
+		return nil
+	}
+	return &v
+}
+
+func showLinkingLogin(ctx *context.Context, authSource *auth.Source, gothUser goth.User) {
 	if err := updateSession(ctx, nil, map[string]any{
-		"linkAccountGothUser": gothUser,
+		"linkAccountData": LinkAccountData{*authSource, gothUser},
 	}); err != nil {
 		ctx.ServerError("updateSession", err)
 		return
@@ -281,7 +294,7 @@ func showLinkingLogin(ctx *context.Context, gothUser goth.User) {
 	ctx.Redirect(setting.AppSubURL + "/user/link_account")
 }
 
-func updateAvatarIfNeed(ctx *context.Context, url string, u *user_model.User) {
+func oauth2UpdateAvatarIfNeed(ctx *context.Context, url string, u *user_model.User) {
 	if setting.OAuth2Client.UpdateAvatar && len(url) > 0 {
 		resp, err := http.Get(url)
 		if err == nil {
@@ -299,11 +312,14 @@ func updateAvatarIfNeed(ctx *context.Context, url string, u *user_model.User) {
 	}
 }
 
-func handleOAuth2SignIn(ctx *context.Context, source *auth.Source, u *user_model.User, gothUser goth.User) {
+func handleOAuth2SignIn(ctx *context.Context, authSource *auth.Source, u *user_model.User, gothUser goth.User) {
-	updateAvatarIfNeed(ctx, gothUser.AvatarURL, u)
+	oauth2SignInSync(ctx, authSource, u, gothUser)
+	if ctx.Written() {
+		return
+	}
 
 	needs2FA := false
-	if !source.TwoFactorShouldSkip() {
+	if !authSource.TwoFactorShouldSkip() {
 		_, err := auth.GetTwoFactorByUID(ctx, u.ID)
 		if err != nil && !auth.IsErrTwoFactorNotEnrolled(err) {
 			ctx.ServerError("UserSignIn", err)
@@ -312,7 +328,7 @@ func handleOAuth2SignIn(ctx *context.Context, source *auth.Source, u *user_model
 		needs2FA = err == nil
 	}
 
-	oauth2Source := source.Cfg.(*oauth2.Source)
+	oauth2Source := authSource.Cfg.(*oauth2.Source)
 	groupTeamMapping, err := auth_module.UnmarshalGroupTeamMapping(oauth2Source.GroupTeamMap)
 	if err != nil {
 		ctx.ServerError("UnmarshalGroupTeamMapping", err)
@@ -338,7 +354,7 @@ func handleOAuth2SignIn(ctx *context.Context, source *auth.Source, u *user_model
 		}
 	}
 
-	if err := externalaccount.EnsureLinkExternalToUser(ctx, u, gothUser); err != nil {
+	if err := externalaccount.EnsureLinkExternalToUser(ctx, authSource.ID, u, gothUser); err != nil {
 		ctx.ServerError("EnsureLinkExternalToUser", err)
 		return
 	}

routers/web/auth/oauth_signin_sync.go

@@ -0,0 +1,88 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package auth
+
+import (
+	"fmt"
+
+	asymkey_model "code.gitea.io/gitea/models/asymkey"
+	"code.gitea.io/gitea/models/auth"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/util"
+	asymkey_service "code.gitea.io/gitea/services/asymkey"
+	"code.gitea.io/gitea/services/auth/source/oauth2"
+	"code.gitea.io/gitea/services/context"
+
+	"github.com/markbates/goth"
+)
+
+func oauth2SignInSync(ctx *context.Context, authSource *auth.Source, u *user_model.User, gothUser goth.User) {
+	oauth2UpdateAvatarIfNeed(ctx, gothUser.AvatarURL, u)
+
+	oauth2Source, _ := authSource.Cfg.(*oauth2.Source)
+	if !authSource.IsOAuth2() || oauth2Source == nil {
+		ctx.ServerError("oauth2SignInSync", fmt.Errorf("source %s is not an OAuth2 source", gothUser.Provider))
+		return
+	}
+
+	// sync full name
+	fullNameKey := util.IfZero(oauth2Source.FullNameClaimName, "name")
+	fullName, _ := gothUser.RawData[fullNameKey].(string)
+	fullName = util.IfZero(fullName, gothUser.Name)
+
+	// need to update if the user has no full name set
+	shouldUpdateFullName := u.FullName == ""
+	// force to update if the attribute is set
+	shouldUpdateFullName = shouldUpdateFullName || oauth2Source.FullNameClaimName != ""
+	// only update if the full name is different
+	shouldUpdateFullName = shouldUpdateFullName && u.FullName != fullName
+	if shouldUpdateFullName {
+		u.FullName = fullName
+		if err := user_model.UpdateUserCols(ctx, u, "full_name"); err != nil {
+			log.Error("Unable to sync OAuth2 user full name %s: %v", gothUser.Provider, err)
+		}
+	}
+
+	err := oauth2UpdateSSHPubIfNeed(ctx, authSource, &gothUser, u)
+	if err != nil {
+		log.Error("Unable to sync OAuth2 SSH public key %s: %v", gothUser.Provider, err)
+	}
+}
+
+func oauth2SyncGetSSHKeys(source *oauth2.Source, gothUser *goth.User) ([]string, error) {
+	value, exists := gothUser.RawData[source.SSHPublicKeyClaimName]
+	if !exists {
+		return []string{}, nil
+	}
+	rawSlice, ok := value.([]any)
+	if !ok {
+		return nil, fmt.Errorf("invalid SSH public key value type: %T", value)
+	}
+
+	sshKeys := make([]string, 0, len(rawSlice))
+	for _, v := range rawSlice {
+		str, ok := v.(string)
+		if !ok {
+			return nil, fmt.Errorf("invalid SSH public key value item type: %T", v)
+		}
+		sshKeys = append(sshKeys, str)
+	}
+	return sshKeys, nil
+}
+
+func oauth2UpdateSSHPubIfNeed(ctx *context.Context, authSource *auth.Source, gothUser *goth.User, user *user_model.User) error {
+	oauth2Source, _ := authSource.Cfg.(*oauth2.Source)
+	if oauth2Source == nil || oauth2Source.SSHPublicKeyClaimName == "" {
+		return nil
+	}
+	sshKeys, err := oauth2SyncGetSSHKeys(oauth2Source, gothUser)
+	if err != nil {
+		return err
+	}
+	if !asymkey_model.SynchronizePublicKeys(ctx, user, authSource, sshKeys) {
+		return nil
+	}
+	return asymkey_service.RewriteAllPublicKeys(ctx)
+}

routers/web/auth/openid.go

@@ -361,7 +361,7 @@ func RegisterOpenIDPost(ctx *context.Context) {
 		Email:  form.Email,
 		Passwd: password,
 	}
-	if !createUserInContext(ctx, tplSignUpOID, form, u, nil, nil, false) {
+	if !createUserInContext(ctx, tplSignUpOID, form, u, nil, nil) {
 		// error already handled
 		return
 	}

routers/web/auth/webauthn.go

@@ -15,7 +15,6 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/templates"
 	"code.gitea.io/gitea/services/context"
-	"code.gitea.io/gitea/services/externalaccount"
 
 	"github.com/go-webauthn/webauthn/protocol"
 	"github.com/go-webauthn/webauthn/webauthn"
@@ -150,7 +149,7 @@ func WebAuthnPasskeyLogin(ctx *context.Context) {
 
 	// Now handle account linking if that's requested
 	if ctx.Session.Get("linkAccount") != nil {
-		if err := externalaccount.LinkAccountFromStore(ctx, ctx.Session, user); err != nil {
+		if err := linkAccountFromContext(ctx, user); err != nil {
 			ctx.ServerError("LinkAccountFromStore", err)
 			return
 		}
@@ -268,7 +267,7 @@ func WebAuthnLoginAssertionPost(ctx *context.Context) {
 
 	// Now handle account linking if that's requested
 	if ctx.Session.Get("linkAccount") != nil {
-		if err := externalaccount.LinkAccountFromStore(ctx, ctx.Session, user); err != nil {
+		if err := linkAccountFromContext(ctx, user); err != nil {
 			ctx.ServerError("LinkAccountFromStore", err)
 			return
 		}

services/auth/source/oauth2/providers.go

@@ -27,6 +27,7 @@ type Provider interface {
 	DisplayName() string
 	IconHTML(size int) template.HTML
 	CustomURLSettings() *CustomURLSettings
+	SupportSSHPublicKey() bool
 }
 
 // GothProviderCreator provides a function to create a goth.Provider

services/auth/source/oauth2/providers_base.go

@@ -14,6 +14,13 @@ import (
 type BaseProvider struct {
 	name        string
 	displayName string
+
+	// TODO: maybe some providers also support SSH public keys, then they can set this to true
+	supportSSHPublicKey bool
+}
+
+func (b *BaseProvider) SupportSSHPublicKey() bool {
+	return b.supportSSHPublicKey
 }
 
 // Name provides the technical name for this provider

services/auth/source/oauth2/providers_openid.go

@@ -17,6 +17,10 @@ import (
 // OpenIDProvider is a GothProvider for OpenID
 type OpenIDProvider struct{}
 
+func (o *OpenIDProvider) SupportSSHPublicKey() bool {
+	return true
+}
+
 // Name provides the technical name for this provider
 func (o *OpenIDProvider) Name() string {
 	return "openidConnect"

services/auth/source/oauth2/source.go

@@ -27,6 +27,9 @@ type Source struct {
 	GroupTeamMap        string
 	GroupTeamMapRemoval bool
 	RestrictedGroup     string
+
+	SSHPublicKeyClaimName string
+	FullNameClaimName     string
 }
 
 // FromDB fills up an OAuth2Config from serialized format.

services/externalaccount/link.go

@@ -1,30 +0,0 @@
-// Copyright 2021 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-package externalaccount
-
-import (
-	"context"
-	"errors"
-
-	user_model "code.gitea.io/gitea/models/user"
-
-	"github.com/markbates/goth"
-)
-
-// Store represents a thing that stores things
-type Store interface {
-	Get(any) any
-	Set(any, any) error
-	Release() error
-}
-
-// LinkAccountFromStore links the provided user with a stored external user
-func LinkAccountFromStore(ctx context.Context, store Store, user *user_model.User) error {
-	gothUser := store.Get("linkAccountGothUser")
-	if gothUser == nil {
-		return errors.New("not in LinkAccount session")
-	}
-
-	return LinkAccountToUser(ctx, user, gothUser.(goth.User))
-}

services/externalaccount/user.go

@@ -8,7 +8,6 @@ import (
 	"strconv"
 	"strings"
 
-	"code.gitea.io/gitea/models/auth"
 	issues_model "code.gitea.io/gitea/models/issues"
 	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
@@ -17,15 +16,11 @@ import (
 	"github.com/markbates/goth"
 )
 
-func toExternalLoginUser(ctx context.Context, user *user_model.User, gothUser goth.User) (*user_model.ExternalLoginUser, error) {
+func toExternalLoginUser(authSourceID int64, user *user_model.User, gothUser goth.User) *user_model.ExternalLoginUser {
-	authSource, err := auth.GetActiveOAuth2SourceByName(ctx, gothUser.Provider)
-	if err != nil {
-		return nil, err
-	}
 	return &user_model.ExternalLoginUser{
 		ExternalID:        gothUser.UserID,
 		UserID:            user.ID,
-		LoginSourceID:     authSource.ID,
+		LoginSourceID:     authSourceID,
 		RawData:           gothUser.RawData,
 		Provider:          gothUser.Provider,
 		Email:             gothUser.Email,
@@ -40,15 +35,12 @@ func toExternalLoginUser(ctx context.Context, user *user_model.User, gothUser go
 		AccessTokenSecret: gothUser.AccessTokenSecret,
 		RefreshToken:      gothUser.RefreshToken,
 		ExpiresAt:         gothUser.ExpiresAt,
-	}, nil
+	}
 }
 
 // LinkAccountToUser link the gothUser to the user
-func LinkAccountToUser(ctx context.Context, user *user_model.User, gothUser goth.User) error {
+func LinkAccountToUser(ctx context.Context, authSourceID int64, user *user_model.User, gothUser goth.User) error {
-	externalLoginUser, err := toExternalLoginUser(ctx, user, gothUser)
+	externalLoginUser := toExternalLoginUser(authSourceID, user, gothUser)
-	if err != nil {
-		return err
-	}
 
 	if err := user_model.LinkExternalToUser(ctx, user, externalLoginUser); err != nil {
 		return err
@@ -72,12 +64,8 @@ func LinkAccountToUser(ctx context.Context, user *user_model.User, gothUser goth
 }
 
 // EnsureLinkExternalToUser link the gothUser to the user
-func EnsureLinkExternalToUser(ctx context.Context, user *user_model.User, gothUser goth.User) error {
+func EnsureLinkExternalToUser(ctx context.Context, authSourceID int64, user *user_model.User, gothUser goth.User) error {
-	externalLoginUser, err := toExternalLoginUser(ctx, user, gothUser)
+	externalLoginUser := toExternalLoginUser(authSourceID, user, gothUser)
-	if err != nil {
-		return err
-	}
-
 	return user_model.EnsureLinkExternalToUser(ctx, externalLoginUser)
 }
 

services/forms/auth_form.go

@@ -18,7 +18,10 @@ type AuthenticationForm struct {
 	Type            int    `binding:"Range(2,7)"`
 	Name            string `binding:"Required;MaxSize(30)"`
 	TwoFactorPolicy string
+	IsActive        bool
+	IsSyncEnabled   bool
 
+	// LDAP
 	Host                  string
 	Port                  int
 	BindDN                string
@@ -43,8 +46,10 @@ type AuthenticationForm struct {
 	UserUID               string
 	RestrictedFilter      string
 	AllowDeactivateAll    bool
-	IsActive                      bool
+	GroupTeamMap          string `binding:"ValidGroupTeamMap"`
-	IsSyncEnabled                 bool
+	GroupTeamMapRemoval   bool
+
+	// SMTP
 	SMTPAuth         string
 	SMTPHost         string
 	SMTPPort         int
@@ -55,8 +60,12 @@ type AuthenticationForm struct {
 	HeloHostname     string
 	DisableHelo      bool
 	ForceSMTPS       bool
+
+	// PAM
 	PAMServiceName string
 	PAMEmailDomain string
+
+	// Oauth2 & OIDC
 	Oauth2Provider                string
 	Oauth2Key                     string
 	Oauth2Secret                  string
@@ -76,13 +85,15 @@ type AuthenticationForm struct {
 	Oauth2RestrictedGroup         string
 	Oauth2GroupTeamMap            string `binding:"ValidGroupTeamMap"`
 	Oauth2GroupTeamMapRemoval     bool
+	Oauth2SSHPublicKeyClaimName   string
+	Oauth2FullNameClaimName       string
+
+	// SSPI
 	SSPIAutoCreateUsers      bool
 	SSPIAutoActivateUsers    bool
 	SSPIStripDomainNames     bool
 	SSPISeparatorReplacement string `binding:"AlphaDashDot;MaxSize(5)"`
 	SSPIDefaultLanguage      string
-	GroupTeamMap                  string `binding:"ValidGroupTeamMap"`
-	GroupTeamMapRemoval           bool
 }
 
 // Validate validates fields

templates/admin/auth/edit.tmpl

@@ -301,19 +301,30 @@
 						<input id="oauth2_tenant" name="oauth2_tenant" value="{{if $cfg.CustomURLMapping}}{{$cfg.CustomURLMapping.Tenant}}{{end}}">
 					</div>
 
-					{{range .OAuth2Providers}}{{if .CustomURLSettings}}
+					{{range .OAuth2Providers}}
+						<input id="{{.Name}}_SupportSSHPublicKey" value="{{.SupportSSHPublicKey}}" type="hidden">
+						{{if .CustomURLSettings}}
 						<input id="{{.Name}}_customURLSettings" type="hidden" data-required="{{.CustomURLSettings.Required}}" data-available="true">
 						<input id="{{.Name}}_token_url" value="{{.CustomURLSettings.TokenURL.Value}}" data-available="{{.CustomURLSettings.TokenURL.Available}}" data-required="{{.CustomURLSettings.TokenURL.Required}}" type="hidden">
 						<input id="{{.Name}}_auth_url" value="{{.CustomURLSettings.AuthURL.Value}}" data-available="{{.CustomURLSettings.AuthURL.Available}}" data-required="{{.CustomURLSettings.AuthURL.Required}}" type="hidden">
 						<input id="{{.Name}}_profile_url" value="{{.CustomURLSettings.ProfileURL.Value}}" data-available="{{.CustomURLSettings.ProfileURL.Available}}" data-required="{{.CustomURLSettings.ProfileURL.Required}}" type="hidden">
 						<input id="{{.Name}}_email_url" value="{{.CustomURLSettings.EmailURL.Value}}" data-available="{{.CustomURLSettings.EmailURL.Available}}" data-required="{{.CustomURLSettings.EmailURL.Required}}" type="hidden">
 						<input id="{{.Name}}_tenant" value="{{.CustomURLSettings.Tenant.Value}}" data-available="{{.CustomURLSettings.Tenant.Available}}" data-required="{{.CustomURLSettings.Tenant.Required}}" type="hidden">
-					{{end}}{{end}}
+						{{end}}
+				{{end}}
 
 					<div class="field">
 						<label for="oauth2_scopes">{{ctx.Locale.Tr "admin.auths.oauth2_scopes"}}</label>
 						<input id="oauth2_scopes" name="oauth2_scopes" value="{{if $cfg.Scopes}}{{StringUtils.Join $cfg.Scopes ","}}{{end}}">
 					</div>
+					<div class="field">
+						<label>{{ctx.Locale.Tr "admin.auths.oauth2_full_name_claim_name"}}</label>
+						<input name="oauth2_full_name_claim_name" value="{{$cfg.FullNameClaimName}}" placeholder="name">
+					</div>
+					<div class="field oauth2_ssh_public_key_claim_name">
+						<label>{{ctx.Locale.Tr "admin.auths.oauth2_ssh_public_key_claim_name"}}</label>
+						<input name="oauth2_ssh_public_key_claim_name" value="{{$cfg.SSHPublicKeyClaimName}}" placeholder="sshpubkey">
+					</div>
 					<div class="field">
 						<label for="oauth2_required_claim_name">{{ctx.Locale.Tr "admin.auths.oauth2_required_claim_name"}}</label>
 						<input id="oauth2_required_claim_name" name="oauth2_required_claim_name" value="{{$cfg.RequiredClaimName}}">

templates/admin/auth/source/oauth.tmpl

@@ -63,19 +63,31 @@
 		<input id="oauth2_tenant" name="oauth2_tenant" value="{{.oauth2_tenant}}">
 	</div>
 
-	{{range .OAuth2Providers}}{{if .CustomURLSettings}}
+	{{range .OAuth2Providers}}
+		<input id="{{.Name}}_SupportSSHPublicKey" value="{{.SupportSSHPublicKey}}" type="hidden">
+		{{if .CustomURLSettings}}
 		<input id="{{.Name}}_customURLSettings" type="hidden" data-required="{{.CustomURLSettings.Required}}" data-available="true">
 		<input id="{{.Name}}_token_url" value="{{.CustomURLSettings.TokenURL.Value}}" data-available="{{.CustomURLSettings.TokenURL.Available}}" data-required="{{.CustomURLSettings.TokenURL.Required}}" type="hidden">
 		<input id="{{.Name}}_auth_url" value="{{.CustomURLSettings.AuthURL.Value}}" data-available="{{.CustomURLSettings.AuthURL.Available}}" data-required="{{.CustomURLSettings.AuthURL.Required}}" type="hidden">
 		<input id="{{.Name}}_profile_url" value="{{.CustomURLSettings.ProfileURL.Value}}" data-available="{{.CustomURLSettings.ProfileURL.Available}}" data-required="{{.CustomURLSettings.ProfileURL.Required}}" type="hidden">
 		<input id="{{.Name}}_email_url" value="{{.CustomURLSettings.EmailURL.Value}}" data-available="{{.CustomURLSettings.EmailURL.Available}}" data-required="{{.CustomURLSettings.EmailURL.Required}}" type="hidden">
 		<input id="{{.Name}}_tenant" value="{{.CustomURLSettings.Tenant.Value}}" data-available="{{.CustomURLSettings.Tenant.Available}}" data-required="{{.CustomURLSettings.Tenant.Required}}" type="hidden">
-	{{end}}{{end}}
+		{{end}}
+	{{end}}
 
 	<div class="field">
 		<label for="oauth2_scopes">{{ctx.Locale.Tr "admin.auths.oauth2_scopes"}}</label>
 		<input id="oauth2_scopes" name="oauth2_scopes" value="{{.oauth2_scopes}}">
 	</div>
+
+	<div class="field">
+		<label>{{ctx.Locale.Tr "admin.auths.oauth2_full_name_claim_name"}}</label>
+		<input name="oauth2_full_name_claim_name" value="{{.oauth2_full_name_claim_name}}" placeholder="name">
+	</div>
+	<div class="field oauth2_ssh_public_key_claim_name">
+		<label>{{ctx.Locale.Tr "admin.auths.oauth2_ssh_public_key_claim_name"}}</label>
+		<input name="oauth2_ssh_public_key_claim_name" value="{{.oauth2_ssh_public_key_claim_name}}" placeholder="sshpubkey">
+	</div>
 	<div class="field">
 		<label for="oauth2_required_claim_name">{{ctx.Locale.Tr "admin.auths.oauth2_required_claim_name"}}</label>
 		<input id="oauth2_required_claim_name" name="oauth2_required_claim_name" value="{{.oauth2_required_claim_name}}">

tests/integration/oauth_test.go

@@ -9,9 +9,11 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"net/http/httptest"
 	"strings"
 	"testing"
 
+	asymkey_model "code.gitea.io/gitea/models/asymkey"
 	auth_model "code.gitea.io/gitea/models/auth"
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/models/unittest"
@@ -20,9 +22,13 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/modules/test"
+	"code.gitea.io/gitea/modules/util"
+	"code.gitea.io/gitea/services/auth/source/oauth2"
 	"code.gitea.io/gitea/services/oauth2_provider"
 	"code.gitea.io/gitea/tests"
 
+	"github.com/markbates/goth"
+	"github.com/markbates/goth/gothic"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -931,3 +937,107 @@ func testOAuth2WellKnown(t *testing.T) {
 	defer test.MockVariableValue(&setting.OAuth2.Enabled, false)()
 	MakeRequest(t, NewRequest(t, "GET", urlOpenidConfiguration), http.StatusNotFound)
 }
+
+func addOAuth2Source(t *testing.T, authName string, cfg oauth2.Source) {
+	cfg.Provider = util.IfZero(cfg.Provider, "gitea")
+	err := auth_model.CreateSource(db.DefaultContext, &auth_model.Source{
+		Type:     auth_model.OAuth2,
+		Name:     authName,
+		IsActive: true,
+		Cfg:      &cfg,
+	})
+	require.NoError(t, err)
+}
+
+func TestSignInOauthCallbackSyncSSHKeys(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	var mockServer *httptest.Server
+	mockServer = httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/.well-known/openid-configuration":
+			_, _ = w.Write([]byte(`{
+				"issuer": "` + mockServer.URL + `",
+				"authorization_endpoint": "` + mockServer.URL + `/authorize",
+				"token_endpoint": "` + mockServer.URL + `/token",
+				"userinfo_endpoint": "` + mockServer.URL + `/userinfo"
+			}`))
+		default:
+			http.NotFound(w, r)
+		}
+	}))
+	defer mockServer.Close()
+
+	ctx := t.Context()
+	oauth2Source := oauth2.Source{
+		Provider:                      "openidConnect",
+		ClientID:                      "test-client-id",
+		SSHPublicKeyClaimName:         "sshpubkey",
+		FullNameClaimName:             "name",
+		OpenIDConnectAutoDiscoveryURL: mockServer.URL + "/.well-known/openid-configuration",
+	}
+	addOAuth2Source(t, "test-oidc-source", oauth2Source)
+	authSource, err := auth_model.GetActiveOAuth2SourceByAuthName(ctx, "test-oidc-source")
+	require.NoError(t, err)
+
+	sshKey1 := "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICV0MGX/W9IvLA4FXpIuUcdDcbj5KX4syHgsTy7soVgf"
+	sshKey2 := "sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIE7kM1R02+4ertDKGKEDcKG0s+2vyDDcIvceJ0Gqv5f1AAAABHNzaDo="
+	sshKey3 := "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEHjnNEfE88W1pvBLdV3otv28x760gdmPao3lVD5uAt9"
+	cases := []struct {
+		testName           string
+		mockFullName       string
+		mockRawData        map[string]any
+		expectedSSHPubKeys []string
+	}{
+		{
+			testName:           "Login1",
+			mockFullName:       "FullName1",
+			mockRawData:        map[string]any{"sshpubkey": []any{sshKey1 + " any-comment"}},
+			expectedSSHPubKeys: []string{sshKey1},
+		},
+		{
+			testName:           "Login2",
+			mockFullName:       "FullName2",
+			mockRawData:        map[string]any{"sshpubkey": []any{sshKey2 + " any-comment", sshKey3}},
+			expectedSSHPubKeys: []string{sshKey2, sshKey3},
+		},
+		{
+			testName:           "Login3",
+			mockFullName:       "FullName3",
+			mockRawData:        map[string]any{},
+			expectedSSHPubKeys: []string{},
+		},
+	}
+
+	session := emptyTestSession(t)
+	for _, c := range cases {
+		t.Run(c.testName, func(t *testing.T) {
+			defer test.MockVariableValue(&setting.OAuth2Client.Username, "")()
+			defer test.MockVariableValue(&setting.OAuth2Client.EnableAutoRegistration, true)()
+			defer test.MockVariableValue(&gothic.CompleteUserAuth, func(res http.ResponseWriter, req *http.Request) (goth.User, error) {
+				return goth.User{
+					Provider: authSource.Cfg.(*oauth2.Source).Provider,
+					UserID:   "oidc-userid",
+					Email:    "oidc-email@example.com",
+					RawData:  c.mockRawData,
+					Name:     c.mockFullName,
+				}, nil
+			})()
+			req := NewRequest(t, "GET", "/user/oauth2/test-oidc-source/callback?code=XYZ&state=XYZ")
+			session.MakeRequest(t, req, http.StatusSeeOther)
+			user := unittest.AssertExistsAndLoadBean(t, &user_model.User{Name: "oidc-userid"})
+			keys, _, err := db.FindAndCount[asymkey_model.PublicKey](ctx, asymkey_model.FindPublicKeyOptions{
+				ListOptions:   db.ListOptionsAll,
+				OwnerID:       user.ID,
+				LoginSourceID: authSource.ID,
+			})
+			require.NoError(t, err)
+			var sshPubKeys []string
+			for _, key := range keys {
+				sshPubKeys = append(sshPubKeys, key.Content)
+			}
+			assert.ElementsMatch(t, c.expectedSSHPubKeys, sshPubKeys)
+			assert.Equal(t, c.mockFullName, user.FullName)
+		})
+	}
+}

tests/integration/signin_test.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 	"testing"
 
+	auth_model "code.gitea.io/gitea/models/auth"
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/models/unittest"
 	user_model "code.gitea.io/gitea/models/user"
@@ -17,6 +18,7 @@ import (
 	"code.gitea.io/gitea/modules/translation"
 	"code.gitea.io/gitea/modules/web"
 	"code.gitea.io/gitea/routers"
+	"code.gitea.io/gitea/routers/web/auth"
 	"code.gitea.io/gitea/services/context"
 	"code.gitea.io/gitea/tests"
 
@@ -103,8 +105,9 @@ func TestEnablePasswordSignInFormAndEnablePasskeyAuth(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()
 
 	mockLinkAccount := func(ctx *context.Context) {
+		authSource := auth_model.Source{ID: 1}
 		gothUser := goth.User{Email: "invalid-email", Name: "."}
-		_ = ctx.Session.Set("linkAccountGothUser", gothUser)
+		_ = ctx.Session.Set("linkAccountData", auth.LinkAccountData{AuthSource: authSource, GothUser: gothUser})
 	}
 
 	t.Run("EnablePasswordSignInForm=false", func(t *testing.T) {

web_src/js/features/admin/common.ts

@@ -102,6 +102,9 @@ function initAdminAuthentication() {
         break;
       }
     }
+
+    const supportSshPublicKey = document.querySelector<HTMLInputElement>(`#${provider}_SupportSSHPublicKey`)?.value === 'true';
+    toggleElem('.field.oauth2_ssh_public_key_claim_name', supportSshPublicKey);
     onOAuth2UseCustomURLChange(applyDefaultValues);
   }