feat: support for prompt=login in oidc flow

frontend/src/lib/hooks/screen-params.ts

@@ -6,6 +6,7 @@ type ScreenParams = {
   oidc_ticket?: string;
   oidc_scope?: string;
   oidc_name?: string;
+  oidc_login?: boolean;
 };
 
 const zodScreenParams = z.object({
@@ -14,6 +15,7 @@ const zodScreenParams = z.object({
   oidc_ticket: z.string().optional(),
   oidc_scope: z.string().optional(),
   oidc_name: z.string().optional(),
+  oidc_login: z.stringbool().optional(),
 });
 
 export function useScreenParams(params: URLSearchParams): ScreenParams {

frontend/src/pages/authorize-page.tsx

@@ -119,7 +119,7 @@ export const AuthorizePage = () => {
     );
   }
 
-  if (!auth.authenticated) {
+  if (!auth.authenticated || screenParams.oidc_login) {
     return <Navigate to={`/login${compiledParams}`} replace />;
   }
 

frontend/src/pages/login-page.tsx

@@ -63,7 +63,10 @@ export const LoginPage = () => {
 
   const searchParams = new URLSearchParams(search);
   const screenParams = useScreenParams(searchParams);
-  const compiledParams = recompileScreenParams(screenParams);
+  const compiledParams = recompileScreenParams({
+    ...screenParams,
+    oidc_login: false,
+  });
   const loginForUrl = useLoginFor({
     login_for: screenParams.login_for,
     compiledParams,
@@ -196,7 +199,7 @@ export const LoginPage = () => {
     };
   }, [redirectTimer, redirectButtonTimer]);
 
-  if (auth.authenticated) {
+  if (auth.authenticated && !screenParams.oidc_login) {
     return <Navigate to={loginForUrl} replace />;
   }
 

internal/controller/oidc_controller.go

@@ -73,6 +73,7 @@ type AuthorizeScreenParams struct {
 	OIDCTicket string           `url:"oidc_ticket"`
 	OIDCScope  string           `url:"oidc_scope"`
 	OIDCName   string           `url:"oidc_name"`
+	OIDCLogin  bool             `url:"oidc_login"`
 }
 
 type AuthorizeCompleteRequest struct {
@@ -169,12 +170,18 @@ func (controller *OIDCController) authorize(c *gin.Context) {
 
 	ticket := controller.oidc.CreateAuthorizeRequestTicket(*req)
 
-	queries, err := query.Values(AuthorizeScreenParams{
+	values := AuthorizeScreenParams{
 		LoginFor:   FrontendLoginForOIDC,
 		OIDCTicket: ticket,
 		OIDCScope:  req.Scope,
 		OIDCName:   client.Name,
-	})
+	}
+
+	if req.Prompt == "login" {
+		values.OIDCLogin = true
+	}
+
+	queries, err := query.Values(values)
 
 	if err != nil {
 		controller.authorizeError(c, authorizeErrorParams{
@@ -425,7 +432,7 @@ func (controller *OIDCController) Token(c *gin.Context) {
 			return
 		}
 
-		tokenRes, err := controller.oidc.GenerateAccessToken(c, client, *entry)
+		tokenRes, err := controller.oidc.GenerateAccessToken(c, client, *entry, entry.AuthTime)
 
 		if err != nil {
 			controller.log.App.Error().Err(err).Msg("Failed to generate access token")

internal/model/context.go

@@ -25,6 +25,7 @@ const (
 type UserContext struct {
 	Authenticated bool
 	Provider      ProviderType
+	AuthTime      int64
 	Local         *LocalContext
 	OAuth         *OAuthContext
 	LDAP          *LDAPContext
@@ -110,6 +111,7 @@ func (c *UserContext) NewFromGin(ginctx *gin.Context) (*UserContext, error) {
 func (c *UserContext) NewFromSession(session *repository.Session) (*UserContext, error) {
 	*c = UserContext{
 		Authenticated: !session.TotpPending,
+		AuthTime:      session.CreatedAt,
 	}
 
 	switch session.Provider {

internal/service/oidc_service.go

@@ -54,6 +54,7 @@ type ClaimSet struct {
 	Sub               string   `json:"sub"`
 	Iat               int64    `json:"iat"`
 	Exp               int64    `json:"exp"`
+	AuthTime          int64    `json:"auth_time,omitempty"`
 	Name              string   `json:"name,omitempty"`
 	GivenName         string   `json:"given_name,omitempty"`
 	FamilyName        string   `json:"family_name,omitempty"`
@@ -117,6 +118,7 @@ type AuthorizeRequest struct {
 	Nonce               string `form:"nonce" json:"nonce" url:"nonce"`
 	CodeChallenge       string `form:"code_challenge" json:"code_challenge" url:"code_challenge"`
 	CodeChallengeMethod string `form:"code_challenge_method" json:"code_challenge_method" url:"code_challenge_method"`
+	Prompt              string `form:"prompt" json:"prompt" url:"prompt"`
 }
 
 type AuthorizeCodeEntry struct {
@@ -127,6 +129,7 @@ type AuthorizeCodeEntry struct {
 	Nonce         string
 	CodeChallenge string
 	Userinfo      UserinfoResponse
+	AuthTime      int64
 }
 
 type UsedCodeEntry struct {
@@ -423,6 +426,7 @@ func (service *OIDCService) CreateCode(req AuthorizeRequest, userContext model.U
 		ClientID:    req.ClientID,
 		Nonce:       req.Nonce,
 		Userinfo:    service.userinfoFromContext(userContext, sub),
+		AuthTime:    userContext.AuthTime,
 	}
 
 	if req.CodeChallenge != "" {
@@ -512,7 +516,7 @@ func (service *OIDCService) GetCodeEntry(codeHash string, clientId string) (*Aut
 	return &entry, true
 }
 
-func (service *OIDCService) generateIDToken(client model.OIDCClientConfig, user UserinfoResponse, scope string, nonce string) (string, error) {
+func (service *OIDCService) generateIDToken(client model.OIDCClientConfig, user UserinfoResponse, scope string, nonce string, auth_time int64) (string, error) {
 	createdAt := time.Now().Unix()
 	expiresAt := time.Now().Add(time.Duration(service.config.Auth.SessionExpiry) * time.Second).Unix()
 
@@ -549,6 +553,7 @@ func (service *OIDCService) generateIDToken(client model.OIDCClientConfig, user
 		Sub:               user.Sub,
 		Iat:               createdAt,
 		Exp:               expiresAt,
+		AuthTime:          auth_time,
 		Name:              userInfo.Name,
 		Email:             userInfo.Email,
 		EmailVerified:     userInfo.EmailVerified,
@@ -578,8 +583,8 @@ func (service *OIDCService) generateIDToken(client model.OIDCClientConfig, user
 	return token, nil
 }
 
-func (service *OIDCService) GenerateAccessToken(ctx context.Context, client model.OIDCClientConfig, codeEntry AuthorizeCodeEntry) (*TokenResponse, error) {
+func (service *OIDCService) GenerateAccessToken(ctx context.Context, client model.OIDCClientConfig, codeEntry AuthorizeCodeEntry, authTime int64) (*TokenResponse, error) {
-	idToken, err := service.generateIDToken(client, codeEntry.Userinfo, codeEntry.Scope, codeEntry.Nonce)
+	idToken, err := service.generateIDToken(client, codeEntry.Userinfo, codeEntry.Scope, codeEntry.Nonce, authTime)
 
 	if err != nil {
 		return nil, err
@@ -660,7 +665,7 @@ func (service *OIDCService) RefreshAccessToken(ctx context.Context, refreshToken
 
 	idToken, err := service.generateIDToken(model.OIDCClientConfig{
 		ClientID: entry.ClientID,
-	}, userInfo, entry.Scope, entry.Nonce)
+	}, userInfo, entry.Scope, entry.Nonce, 0) // auth_time is not available during refresh, so we set it to 0
 
 	if err != nil {
 		return nil, err
@@ -929,5 +934,6 @@ func (service *OIDCService) DecodeAuthorizeJWT(tokenString string) (*AuthorizeRe
 		Nonce:               get("nonce"),
 		CodeChallenge:       get("code_challenge"),
 		CodeChallengeMethod: get("code_challenge_method"),
+		Prompt:              get("prompt"),
 	}, nil
 }