fix security

VigilCareClinicalAPI/Authorization/PermissionAuthorizationHandler.cs

@@ -1,19 +1,57 @@
+using System.Security.Claims;
 using Microsoft.AspNetCore.Authorization;
 
 public class PermissionAuthorizationHandler : AuthorizationHandler<PermissionRequirement>
 {
+    private readonly ILogger<PermissionAuthorizationHandler> _logger;
+    private readonly IHttpContextAccessor _http;
+    private readonly ClinicalMetrics _metrics;
+
+    public PermissionAuthorizationHandler(
+        ILogger<PermissionAuthorizationHandler> logger,
+        IHttpContextAccessor http,
+        ClinicalMetrics metrics)
+    {
+        _logger = logger;
+        _http = http;
+        _metrics = metrics;
+    }
+
     protected override Task HandleRequirementAsync(
         AuthorizationHandlerContext context,
         PermissionRequirement requirement)
     {
         var roleClaim = context.User.FindFirst("clinical_role")?.Value;
         if (roleClaim is null)
+        {
+            LogAuthorizationFailure(context.User, "none", requirement.Permission);
             return Task.CompletedTask;
+        }
 
         var role = ClinicalRoleExtensions.FromDbString(roleClaim);
         if (ClinicalRolePermissionMap.HasPermission(role, requirement.Permission))
+        {
             context.Succeed(requirement);
+        }
+        else
+        {
+            LogAuthorizationFailure(context.User, roleClaim, requirement.Permission);
+        }
 
         return Task.CompletedTask;
     }
+
+    private void LogAuthorizationFailure(ClaimsPrincipal user, string role, string permission)
+    {
+        var username = user.FindFirst(ClaimTypes.Name)?.Value ?? "unknown";
+        var userId = user.FindFirst(ClaimTypes.NameIdentifier)?.Value ?? "unknown";
+        var endpoint = _http.HttpContext?.GetEndpoint()?.DisplayName ?? "unknown";
+
+        _logger.LogWarning(
+            "Authorization denied: user={User} (id={UserId}), role={Role}, " +
+            "requiredPermission={Permission}, endpoint={Endpoint}",
+            username, userId, role, permission, endpoint);
+
+        _metrics.AuthorizationFailuresTotal.WithLabels(permission, role).Inc();
+    }
 }