feat: add option to run tinyauth on a top-level domain

internal/bootstrap/app_bootstrap.go

@@ -104,7 +104,13 @@ func (app *BootstrapApp) Setup() error {
 	}
 
 	// Get cookie domain
-	cookieDomain, err := utils.GetCookieDomain(app.context.appUrl)
+	cookieDomainResolver := utils.GetCookieDomain
+	if !app.config.Auth.SubdomainsEnabled {
+		tlog.App.Info().Msg("Subdomains disabled, automatic authentication for proxied apps will not work")
+		cookieDomainResolver = utils.GetStandaloneCookieDomain
+	}
+
+	cookieDomain, err := cookieDomainResolver(app.context.appUrl)
 
 	if err != nil {
 		return err

internal/bootstrap/router_bootstrap.go

@@ -83,6 +83,7 @@ func (app *BootstrapApp) setupRouter() (*gin.Engine, error) {
 		RedirectCookieName:     app.context.redirectCookieName,
 		CookieDomain:           app.context.cookieDomain,
 		OAuthSessionCookieName: app.context.oauthSessionCookieName,
+		SubdomainsEnabled:      app.config.Auth.SubdomainsEnabled,
 	}, apiRouter, app.services.authService)
 
 	oauthController.SetupRoutes()

internal/bootstrap/service_bootstrap.go

@@ -100,6 +100,7 @@ func (app *BootstrapApp) initServices(queries *repository.Queries) (Services, er
 		SessionCookieName:  app.context.sessionCookieName,
 		IP:                 app.config.Auth.IP,
 		LDAPGroupsCacheTTL: app.config.Ldap.GroupCacheTTL,
+		SubdomainsEnabled:  app.config.Auth.SubdomainsEnabled,
 	}, services.ldapService, queries, services.oauthBrokerService)
 
 	err = authService.Init()

internal/config/config.go

@@ -18,6 +18,7 @@ func NewDefaultConfiguration() *Config {
 			Address: "0.0.0.0",
 		},
 		Auth: AuthConfig{
+			SubdomainsEnabled:  true,
 			SessionExpiry:      86400, // 1 day
 			SessionMaxLifetime: 0,     // disabled
 			LoginTimeout:       300,   // 5 minutes
@@ -116,6 +117,7 @@ type ServerConfig struct {
 type AuthConfig struct {
 	IP                 IPConfig                  `description:"IP whitelisting config options." yaml:"ip"`
 	Users              []string                  `description:"Comma-separated list of users (username:hashed_password)." yaml:"users"`
+	SubdomainsEnabled  bool                      `description:"Enable subdomains support." yaml:"subdomainsEnabled"`
 	UserAttributes     map[string]UserAttributes `description:"Map of per-user OIDC attributes (username -> attributes)." yaml:"userAttributes"`
 	UsersFile          string                    `description:"Path to the users file." yaml:"usersFile"`
 	SecureCookie       bool                      `description:"Enable secure cookies." yaml:"secureCookie"`

internal/controller/oauth_controller.go

@@ -27,6 +27,7 @@ type OAuthControllerConfig struct {
 	SecureCookie           bool
 	AppURL                 string
 	CookieDomain           string
+	SubdomainsEnabled      bool
 }
 
 type OAuthController struct {
@@ -106,7 +107,7 @@ func (controller *OAuthController) oauthURLHandler(c *gin.Context) {
 		return
 	}
 
-	c.SetCookie(controller.config.OAuthSessionCookieName, sessionId, int(time.Hour.Seconds()), "/", fmt.Sprintf(".%s", controller.config.CookieDomain), controller.config.SecureCookie, true)
+	c.SetCookie(controller.config.OAuthSessionCookieName, sessionId, int(time.Hour.Seconds()), "/", controller.getCookieDomain(), controller.config.SecureCookie, true)
 
 	c.JSON(200, gin.H{
 		"status":  200,
@@ -136,7 +137,7 @@ func (controller *OAuthController) oauthCallbackHandler(c *gin.Context) {
 		return
 	}
 
-	c.SetCookie(controller.config.OAuthSessionCookieName, "", -1, "/", fmt.Sprintf(".%s", controller.config.CookieDomain), controller.config.SecureCookie, true)
+	c.SetCookie(controller.config.OAuthSessionCookieName, "", -1, "/", controller.getCookieDomain(), controller.config.SecureCookie, true)
 
 	oauthPendingSession, err := controller.auth.GetOAuthPendingSession(sessionIdCookie)
 
@@ -282,3 +283,10 @@ func (controller *OAuthController) isOidcRequest(params service.OAuthURLParams)
 		params.ClientID != "" &&
 		params.RedirectURI != ""
 }
+
+func (controller *OAuthController) getCookieDomain() string {
+	if controller.config.SubdomainsEnabled {
+		return "." + controller.config.CookieDomain
+	}
+	return controller.config.CookieDomain
+}

internal/service/auth_service.go

@@ -79,6 +79,7 @@ type AuthServiceConfig struct {
 	SessionCookieName  string
 	IP                 config.IPConfig
 	LDAPGroupsCacheTTL int
+	SubdomainsEnabled  bool
 }
 
 type AuthService struct {
@@ -326,7 +327,7 @@ func (auth *AuthService) CreateSessionCookie(c *gin.Context, data *repository.Se
 		return err
 	}
 
-	c.SetCookie(auth.config.SessionCookieName, session.UUID, expiry, "/", fmt.Sprintf(".%s", auth.config.CookieDomain), auth.config.SecureCookie, true)
+	c.SetCookie(auth.config.SessionCookieName, session.UUID, expiry, "/", auth.getCookieDomain(), auth.config.SecureCookie, true)
 
 	return nil
 }
@@ -377,7 +378,7 @@ func (auth *AuthService) RefreshSessionCookie(c *gin.Context) error {
 		return err
 	}
 
-	c.SetCookie(auth.config.SessionCookieName, cookie, int(newExpiry-currentTime), "/", fmt.Sprintf(".%s", auth.config.CookieDomain), auth.config.SecureCookie, true)
+	c.SetCookie(auth.config.SessionCookieName, cookie, int(newExpiry-currentTime), "/", auth.getCookieDomain(), auth.config.SecureCookie, true)
 	tlog.App.Trace().Str("username", session.Username).Msg("Session cookie refreshed")
 
 	return nil
@@ -396,7 +397,7 @@ func (auth *AuthService) DeleteSessionCookie(c *gin.Context) error {
 		return err
 	}
 
-	c.SetCookie(auth.config.SessionCookieName, "", -1, "/", fmt.Sprintf(".%s", auth.config.CookieDomain), auth.config.SecureCookie, true)
+	c.SetCookie(auth.config.SessionCookieName, "", -1, "/", auth.getCookieDomain(), auth.config.SecureCookie, true)
 
 	return nil
 }
@@ -833,3 +834,10 @@ func (auth *AuthService) ClearRateLimitsTestingOnly() {
 	}
 	auth.loginMutex.Unlock()
 }
+
+func (auth *AuthService) getCookieDomain() string {
+	if auth.config.SubdomainsEnabled {
+		return "." + auth.config.CookieDomain
+	}
+	return auth.config.CookieDomain
+}

internal/utils/app_utils.go

@@ -49,6 +49,15 @@ func GetCookieDomain(u string) (string, error) {
 	return domain, nil
 }
 
+func GetStandaloneCookieDomain(u string) (string, error) {
+	parsed, err := url.Parse(u)
+	if err != nil {
+		return "", err
+	}
+
+	return parsed.Hostname(), nil
+}
+
 func ParseFileToLine(content string) string {
 	lines := strings.Split(content, "\n")
 	users := make([]string, 0)