Missing Tls in Buffalo

In the Go-based Buffalo web framework, missing TLS enforcement commonly occurs when developers rely solely on reverse proxies (like Nginx or cloud load balancers) for HTTPS termination without configuring the application to enforce secure connections. This creates a gap where direct access to the Buffalo server over HTTP exposes sensitive data. Attack patterns include:

• Protocol downgrade via direct IP access: If the Buffalo instance is exposed on a public IP or internal network without proxy enforcement, attackers can connect directly via HTTP to endpoints like /api/v1/users or /login, capturing session cookies, authorization headers, or payloads in plaintext. This is especially risky when Buffalo’s session middleware stores tokens in cookies without the Secure flag.
• Man-in-the-middle on internal networks: In microservices architectures, service-to-service calls between Buffalo instances or to backend APIs often skip TLS if internal traffic is considered 'trusted.' An attacker who gains network access (e.g., via compromised container or ARP spoofing) can intercept credentials, API keys, or payloads. For example, a Buffalo handler making an outbound request to a payment API using http://payment-service:8080/charge instead of HTTPS leaks card data.
• Exploitation of misconfigured health checks: Load balancers sometimes use HTTP health checks to /ping or /status endpoints. If these are accessible externally without TLS, attackers can map internal services and probe for weaknesses, using the unencrypted channel to gather intelligence before launching targeted attacks.

These issues are frequently found in Buffalo applications where developers assume the proxy handles all security, neglecting to set TLSConfig in the server or enforce redirects via middleware. The absence of TLS is not just a transport issue—it undermines authentication, data integrity, and compliance with standards like PCI-DSS Requirement 4 and OWASP API2:2023 (Broken Authentication).

Detecting missing TLS in Buffalo applications requires checking both configuration and runtime behavior, as the framework does not enforce HTTPS by default. Key indicators include:

• The buffalo command starting the server on 0.0.0.0:3000 or similar without -tls flags or TLSConfig in app.go.
• Absence of middleware that redirects HTTP to HTTPS, such as a custom handler checking r.TLS == nil.
• Session cookies missing the Secure attribute, which can be observed in Set-Cookie headers during HTTP responses.

middleBrick identifies this through unauthenticated black-box scanning of the API endpoint. It performs the following checks:

• Attempts to connect via HTTP to the submitted URL and analyzes responses for sensitive data exposure (e.g., authentication tokens, PII in JSON bodies).
• Checks for the presence of Strict-Transport-Security (HSTS) header—its absence suggests no HTTPS enforcement.
• Tests whether the endpoint upgrades insecure connections; if not, and if the service is reachable over HTTP, it flags missing TLS as a finding.
• Cross-references OpenAPI/Swagger spec (if available) to see if schemes includes only http or lacks https, indicating potential misconfiguration.

For example, scanning a Buffalo API at http://api.example.com might return a 200 OK on /api/v1/profile with a Set-Cookie: session=abc123; Path=/ header (missing Secure and HttpOnly). middleBrick would report this under the 'Encryption' category with severity 'high', noting that session tokens are transmitted in cleartext and providing the exact endpoint and header details.

This detection works without agents or credentials—simply submitting the public URL triggers the scan. middleBrick’s parallel checks ensure that missing TLS is contextualized with other risks (e.g., if combined with missing input validation, the overall risk score increases).

Fixing missing TLS in Buffalo applications involves configuring the server to either enforce HTTPS directly or redirect HTTP traffic to HTTPS. Since Buffalo is built on Go’s net/http, remediation uses standard library features and Buffalo’s middleware system. Below are specific, actionable fixes:

1. Enable HTTPS in the Buffalo Server (Preferred for Edge Deployments)

If Buffalo is exposed directly to clients (not behind a proxy), configure TLS in app.go:

package main

import (
	"github.com/gobuffalo/buffalo"
)

func main() {
	app := buffalo.New(buffalo.Options{
		Env:         "production",
		SessionName: "_session",
	})
	
	// ... configure routes, middleware, etc.

	// Start server with TLS
	if err := app.StartTLS("0.0.0.0:3000", "cert.pem", "key.pem"); err != nil {
		app.Logger.Fatal(err)
	}
}

Replace cert.pem and key.pem with paths to your TLS certificate and private key (e.g., from Let’s Encrypt). This ensures all traffic is encrypted end-to-end.

2. Enforce HTTPS via Middleware (Common for Proxy Setups)

When using a reverse proxy (e.g., NGINX, AWS ALB) for TLS termination, redirect HTTP to HTTPS at the application level using middleware:

package actions

import (
	"github.com/gobuffalo/buffalo"
	"github.com/gobuffalo/buffalo/middleware"
	"net/http"
)

func HTTPSMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
		if r.TLS == nil {
			// Redirect to HTTPS
			redirectURL := "https://" + r.Host + r.URL.Path
			if len(r.URL.RawQuery) > 0 {
				redirectURL += "?" + r.URL.RawQuery
			}
			http.Redirect(rw, r, redirectURL, http.StatusMovedPermanently)
			return
		}
		next.ServeHTTP(rw, r)
	})
}

// In app.go
func App() *buffalo.App {
	app := buffalo.New(buffalo.Options{})
	app.Use(middleware.ParamLogger)
	app.Use(HTTPSMiddleware) // Add this line
	app.GET("/", HomeHandler)
	return app
}

This middleware checks if the request came in over TLS (r.TLS == nil) and redirects to HTTPS with a 301 status. It preserves the original path and query string.

3. Secure Session Cookies

Ensure Buffalo’s session middleware sets the Secure flag when HTTPS is in use:

package main

import (
	"github.com/gobuffalo/buffalo"
	"github.com/gobuffalo/buffalo/middleware"
	"github.com/gobuffalo/buffalo/middleware/session"
)

func main() {
	app := buffalo.New(buffalo.Options{})
	
	// Configure session store with Secure: true
	app.Use(session.New(session.Options{
		SessionName:  "_session",
		Secret:     "your-secret-key",
		Secure:     true, // Critical: only send cookies over HTTPS
		HTTPOnly:   true,
		SameSite:   http.SameSiteStrictMode,
	}))
	
	app.GET("/", HomeHandler)
	app.Start("0.0.0.0:3000") // Now safe due to Secure flag
}

Note: Setting Secure: true means cookies will not be sent over HTTP—this is safe only if HTTPS is enforced (via the middleware above or a proxy).

After applying these changes, rescan with middleBrick to confirm the 'Encryption' finding is resolved. The tool will verify HTTPS enforcement, HSTS presence, and secure cookie attributes, updating the risk score accordingly.