security: enhance JWT and tenant routing middleware

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/Middleware/JwtTransformMiddleware.cs

@@ -6,6 +6,14 @@ using YarpGateway.Config;
 
 namespace YarpGateway.Middleware;
 
+/// <summary>
+/// JWT 转换中间件
+/// 
+/// 安全说明：
+/// 1. 从已验证的 JWT Claims 中提取用户信息（不是直接解析 token）
+/// 2. 清除请求中所有 X-* Header 以防止 Header 注入攻击
+/// 3. 验证租户 ID 与 JWT 中的 tenant claim 一致
+/// </summary>
 public class JwtTransformMiddleware
 {
     private readonly RequestDelegate _next;
@@ -25,32 +33,46 @@ public class JwtTransformMiddleware
 
     public async Task InvokeAsync(HttpContext context)
     {
-        var authHeader = context.Request.Headers["Authorization"].FirstOrDefault();
+        // 安全措施：清除所有 X-* Header 防止 Header 注入攻击
-        if (string.IsNullOrEmpty(authHeader) || !authHeader.StartsWith("Bearer "))
+        var xHeaders = context.Request.Headers
+            .Where(h => h.Key.StartsWith("X-", StringComparison.OrdinalIgnoreCase))
+            .Select(h => h.Key)
+            .ToList();
+        
+        foreach (var header in xHeaders)
+        {
+            context.Request.Headers.Remove(header);
+        }
+
+        // 检查用户是否已通过 JWT 认证
+        if (context.User?.Identity?.IsAuthenticated != true)
         {
             await _next(context);
             return;
         }
 
-        var token = authHeader.Substring("Bearer ".Length).Trim();
-
         try
         {
-            var jwtHandler = new JwtSecurityTokenHandler();
+            // 从已验证的 ClaimsPrincipal 中提取信息（安全）
-            var jwtToken = jwtHandler.ReadJwtToken(token);
+            var claims = context.User.Claims;
             
-            var tenantId = jwtToken.Claims.FirstOrDefault(c => c.Type == "tenant")?.Value;
+            var tenantId = claims.FirstOrDefault(c => c.Type == "tenant")?.Value
-            var userId = jwtToken
+                        ?? claims.FirstOrDefault(c => c.Type == "tenant_id")?.Value;
-                .Claims.FirstOrDefault(c => c.Type == ClaimTypes.NameIdentifier)
+            
-                ?.Value;
+            var userId = claims.FirstOrDefault(c => c.Type == ClaimTypes.NameIdentifier)?.Value
-            var userName = jwtToken.Claims.FirstOrDefault(c => c.Type == ClaimTypes.Name)?.Value;
+                      ?? claims.FirstOrDefault(c => c.Type == "sub")?.Value;
-            var roles = jwtToken
+            
-                .Claims.Where(c => c.Type == ClaimTypes.Role)
+            var userName = claims.FirstOrDefault(c => c.Type == ClaimTypes.Name)?.Value
+                        ?? claims.FirstOrDefault(c => c.Type == "name")?.Value;
+            
+            var roles = claims
+                .Where(c => c.Type == ClaimTypes.Role || c.Type == "role")
                 .Select(c => c.Value)
                 .ToList();
 
             if (!string.IsNullOrEmpty(tenantId))
             {
+                // 安全地设置 Header（从已验证的 JWT 中提取）
                 context.Request.Headers["X-Tenant-Id"] = tenantId;
 
                 if (!string.IsNullOrEmpty(userId))
@@ -63,7 +85,7 @@ public class JwtTransformMiddleware
                     context.Request.Headers["X-Roles"] = string.Join(",", roles);
 
                 _logger.LogInformation(
-                    "JWT transformed - Tenant: {Tenant}, User: {User}",
+                    "JWT claims transformed - Tenant: {Tenant}, User: {User}",
                     tenantId,
                     userId
                 );
@@ -75,7 +97,7 @@ public class JwtTransformMiddleware
         }
         catch (Exception ex)
         {
-            _logger.LogError(ex, "Failed to parse JWT token");
+            _logger.LogError(ex, "Failed to extract claims from authenticated user");
         }
 
         await _next(context);

src/Middleware/TenantRoutingMiddleware.cs

@@ -1,9 +1,18 @@
+using System.Security.Claims;
 using Microsoft.Extensions.Options;
 using System.Text.RegularExpressions;
 using YarpGateway.Services;
 
 namespace YarpGateway.Middleware;
 
+/// <summary>
+/// 租户路由中间件
+/// 
+/// 安全说明：
+/// 1. 验证 X-Tenant-Id Header 与 JWT 中的 tenant claim 一致
+/// 2. 防止租户隔离绕过攻击
+/// 3. 只有验证通过后才进行路由查找
+/// </summary>
 public class TenantRoutingMiddleware
 {
     private readonly RequestDelegate _next;
@@ -22,13 +31,37 @@ public class TenantRoutingMiddleware
 
     public async Task InvokeAsync(HttpContext context)
     {
-        var tenantId = context.Request.Headers["X-Tenant-Id"].FirstOrDefault();
+        var headerTenantId = context.Request.Headers["X-Tenant-Id"].FirstOrDefault();
-        if (string.IsNullOrEmpty(tenantId))
+        
+        if (string.IsNullOrEmpty(headerTenantId))
         {
             await _next(context);
             return;
         }
 
+        // 安全验证：检查 Header 中的租户 ID 是否与 JWT 一致
+        if (context.User?.Identity?.IsAuthenticated == true)
+        {
+            var jwtTenantId = context.User.Claims
+                .FirstOrDefault(c => c.Type == "tenant" || c.Type == "tenant_id")?.Value;
+
+            if (!string.IsNullOrEmpty(jwtTenantId) && jwtTenantId != headerTenantId)
+            {
+                // 记录安全事件
+                _logger.LogWarning(
+                    "Tenant ID mismatch detected! JWT tenant: {JwtTenant}, Header tenant: {HeaderTenant}, User: {User}",
+                    jwtTenantId,
+                    headerTenantId,
+                    context.User.FindFirst(ClaimTypes.NameIdentifier)?.Value ?? "unknown"
+                );
+                
+                // 拒绝请求
+                context.Response.StatusCode = StatusCodes.Status403Forbidden;
+                await context.Response.WriteAsync("Tenant ID verification failed");
+                return;
+            }
+        }
+
         var path = context.Request.Path.Value ?? string.Empty;
         var serviceName = ExtractServiceName(path);
 
@@ -38,10 +71,10 @@ public class TenantRoutingMiddleware
             return;
         }
 
-        var route = _routeCache.GetRoute(tenantId, serviceName);
+        var route = _routeCache.GetRoute(headerTenantId, serviceName);
         if (route == null)
         {
-            _logger.LogWarning("Route not found - Tenant: {Tenant}, Service: {Service}", tenantId, serviceName);
+            _logger.LogDebug("Route not found - Tenant: {Tenant}, Service: {Service}", headerTenantId, serviceName);
             await _next(context);
             return;
         }
@@ -49,8 +82,8 @@ public class TenantRoutingMiddleware
         context.Items["DynamicClusterId"] = route.ClusterId;
 
         var routeType = route.IsGlobal ? "global" : "tenant-specific";
-        _logger.LogInformation("Tenant routing - Tenant: {Tenant}, Service: {Service}, Cluster: {Cluster}, Type: {Type}",
+        _logger.LogDebug("Tenant routing - Tenant: {Tenant}, Service: {Service}, Cluster: {Cluster}, Type: {Type}",
-            tenantId, serviceName, route.ClusterId, routeType);
+            headerTenantId, serviceName, route.ClusterId, routeType);
 
         await _next(context);
     }