Use samesite strict

server/auth/index.ts

@@ -87,17 +87,17 @@ export async function invalidateAllSessions(userId: string): Promise<void> {
 
 export function serializeSessionCookie(token: string): string {
     if (SECURE_COOKIES) {
-        return `${SESSION_COOKIE_NAME}=${token}; HttpOnly; SameSite=Lax; Max-Age=${SESSION_COOKIE_EXPIRES}; Path=/; Secure; Domain=${COOKIE_DOMAIN}`;
+        return `${SESSION_COOKIE_NAME}=${token}; HttpOnly; SameSite=Strict; Max-Age=${SESSION_COOKIE_EXPIRES}; Path=/; Secure; Domain=${COOKIE_DOMAIN}`;
     } else {
-        return `${SESSION_COOKIE_NAME}=${token}; HttpOnly; SameSite=Lax; Max-Age=${SESSION_COOKIE_EXPIRES}; Path=/; Domain=${COOKIE_DOMAIN}`;
+        return `${SESSION_COOKIE_NAME}=${token}; HttpOnly; SameSite=Strict; Max-Age=${SESSION_COOKIE_EXPIRES}; Path=/; Domain=${COOKIE_DOMAIN}`;
     }
 }
 
 export function createBlankSessionTokenCookie(): string {
     if (SECURE_COOKIES) {
-        return `${SESSION_COOKIE_NAME}=; HttpOnly; SameSite=Lax; Max-Age=0; Path=/; Secure; Domain=${COOKIE_DOMAIN}`;
+        return `${SESSION_COOKIE_NAME}=; HttpOnly; SameSite=Strict; Max-Age=0; Path=/; Secure; Domain=${COOKIE_DOMAIN}`;
     } else {
-        return `${SESSION_COOKIE_NAME}=; HttpOnly; SameSite=Lax; Max-Age=0; Path=/; Domain=${COOKIE_DOMAIN}`;
+        return `${SESSION_COOKIE_NAME}=; HttpOnly; SameSite=Strict; Max-Age=0; Path=/; Domain=${COOKIE_DOMAIN}`;
     }
 }
 

server/auth/resource.ts

@@ -166,9 +166,9 @@ export function serializeResourceSessionCookie(
     token: string
 ): string {
     if (SECURE_COOKIES) {
-        return `${cookieName}=${token}; HttpOnly; SameSite=Lax; Max-Age=${SESSION_COOKIE_EXPIRES}; Path=/; Secure; Domain=${COOKIE_DOMAIN}`;
+        return `${cookieName}=${token}; HttpOnly; SameSite=Strict; Max-Age=${SESSION_COOKIE_EXPIRES}; Path=/; Secure; Domain=${COOKIE_DOMAIN}`;
     } else {
-        return `${cookieName}=${token}; HttpOnly; SameSite=Lax; Max-Age=${SESSION_COOKIE_EXPIRES}; Path=/; Domain=${COOKIE_DOMAIN}`;
+        return `${cookieName}=${token}; HttpOnly; SameSite=Strict; Max-Age=${SESSION_COOKIE_EXPIRES}; Path=/; Domain=${COOKIE_DOMAIN}`;
     }
 }
 
@@ -176,9 +176,9 @@ export function createBlankResourceSessionTokenCookie(
     cookieName: string
 ): string {
     if (SECURE_COOKIES) {
-        return `${cookieName}=; HttpOnly; SameSite=Lax; Max-Age=0; Path=/; Secure; Domain=${COOKIE_DOMAIN}`;
+        return `${cookieName}=; HttpOnly; SameSite=Strict; Max-Age=0; Path=/; Secure; Domain=${COOKIE_DOMAIN}`;
     } else {
-        return `${cookieName}=; HttpOnly; SameSite=Lax; Max-Age=0; Path=/; Domain=${COOKIE_DOMAIN}`;
+        return `${cookieName}=; HttpOnly; SameSite=Strict; Max-Age=0; Path=/; Domain=${COOKIE_DOMAIN}`;
     }
 }