From 374e7a7796dad4a1257a975b3ac966a0cca6e8d4 Mon Sep 17 00:00:00 2001
From: Dnyaneshwari Talwekar
 <dtalwekar@li-4c4c4544-0038-3510-8056-b5c04f473234.ibm.com>
Date: Tue, 21 Jul 2026 11:06:26 +0530
Subject: [PATCH] mgr/dashboard: New dashboard user creation is successful with
 long characters > 256 but login fails

Signed-off-by: Dnyaneshwari Talwekar <dtalweka@redhat.com>

Fixes: https://tracker.ceph.com/issues/78439
---
 .../src/app/core/auth/user-form/user-form.component.html    | 4 ++++
 .../src/app/core/auth/user-form/user-form.component.ts      | 6 +++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/pybind/mgr/dashboard/frontend/src/app/core/auth/user-form/user-form.component.html b/src/pybind/mgr/dashboard/frontend/src/app/core/auth/user-form/user-form.component.html
index e0e28e9b2340..d7c779eb1b4a 100644
--- a/src/pybind/mgr/dashboard/frontend/src/app/core/auth/user-form/user-form.component.html
+++ b/src/pybind/mgr/dashboard/frontend/src/app/core/auth/user-form/user-form.component.html
@@ -32,6 +32,7 @@
             i18n-placeholder
             id="username"
             formControlName="username"
+            maxlength="256"
             [invalid]="!userForm.controls.username.valid && userForm.controls.username.dirty"
             autofocus
             ngbTooltip="White spaces at the beginning and end will be trimmed"
@@ -43,6 +44,9 @@
           <span *ngIf="userForm.showError('username', formDir, 'required')">
             <ng-container i18n> This field is required. </ng-container>
           </span>
+          <span *ngIf="userForm.showError('username', formDir, 'maxlength')">
+            <ng-container i18n> Username must not exceed 256 characters. </ng-container>
+          </span>
           <span *ngIf="userForm.showError('username', formDir, 'notUnique')">
             <ng-container i18n> The username already exists. </ng-container>
           </span>
diff --git a/src/pybind/mgr/dashboard/frontend/src/app/core/auth/user-form/user-form.component.ts b/src/pybind/mgr/dashboard/frontend/src/app/core/auth/user-form/user-form.component.ts
index 12fb843692d7..e7b9c8ea9b5e 100644
--- a/src/pybind/mgr/dashboard/frontend/src/app/core/auth/user-form/user-form.component.ts
+++ b/src/pybind/mgr/dashboard/frontend/src/app/core/auth/user-form/user-form.component.ts
@@ -90,7 +90,11 @@ export class UserFormComponent extends CdForm implements OnInit {
       {
         username: [
           '',
-          [Validators.required, Validators.pattern(DASHBOARD_USERNAME_PATTERN)],
+          [
+            Validators.required,
+            Validators.pattern(DASHBOARD_USERNAME_PATTERN),
+            Validators.maxLength(256)
+          ],
           [CdValidators.unique(this.userService.validateUserName, this.userService)]
         ],
         name: [''],
-- 
2.47.3