Missing Tls in Buffalo with Bearer Tokens

When a Buffalo application transmits Bearer tokens over unencrypted HTTP (Missing TLS), tokens can be intercepted in transit via passive sniffing or active man-in-the-middle (MITM) attacks. Bearer tokens rely on transport-layer confidentiality because the token itself is the credential; without TLS, any party on the network path can read the Authorization header. In Buffalo, routes that render JSON or redirect after login may inadvertently expose tokens if responses are served over HTTP or if HTTP is accepted alongside HTTPS.

During an unauthenticated black-box scan, middleBrick checks whether endpoints that issue or accept Bearer tokens are served over TLS and whether sensitive responses are transmitted over cleartext. The scanner inspects headers, cookies, and redirects to detect Missing TLS and flags scenarios where Authorization: Bearer traverses non-HTTPS channels. This is especially risky in development or misconfigured staging environments where TLS termination is absent or inconsistent.

OWASP API Top 10 A02:2023 (Cryptographic Failures) maps to this pattern: failing to encrypt data in transit undermines authentication and confidentiality. Real-world examples include session fixation and token replay when tokens are captured from HTTP traffic. PCI-DSS and GDPR also implicitly require protection of authentication tokens during transmission. middleBrick’s inventory and encryption checks highlight Missing TLS and surface remediation guidance specific to token-bearing flows.

Remediation centers on enforcing HTTPS for all routes and ensuring Bearer tokens are never transmitted or stored insecurely. In Buffalo, you should configure TLS at the reverse proxy or server level and instruct the framework to require secure cookies and strict transport security.

Enforce HTTPS in Buffalo

Ensure your application only serves traffic over HTTPS and redirect HTTP to HTTPS. Below is a minimal main.go example that uses a middleware to enforce TLS in production while allowing HTTP in development via environment variables.

package controllers

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

func App() *buffalo.App {
    if app == nil {
        app = buffalo.New(buffalo.Options{
            Env:         ENV,
            SessionStore: &middleware.SessionCookieStore{},
            PreWares: []buffalo.PreWare{
                middleware.ParameterLogger,
                enforceTLS,
            },
        })
    }
    return app
}

func enforceTLS(next buffalo.Handler) buffalo.Handler {
    return func(c buffalo.Context) error {
        env := os.Getenv("APP_ENV")
        // Enforce TLS in production/staging; skip in local dev for convenience
        if (env == "production" || env == "staging") && c.Request().TLS == nil {
            http.Redirect(c.Response(), c.Request(), "https://"+c.Request().Host+c.Request().RequestURI, http.StatusMovedPermanently)
            return nil
        }
        return next(c)
    }
}

Secure Bearer Token Handling

When issuing Bearer tokens (e.g., after login), set the Secure and HttpOnly flags on cookies if tokens are stored client-side, and always use HTTPS-only cookie attributes. For API responses that return tokens in JSON, ensure the transport is TLS-protected and avoid logging tokens.

// Example login handler that returns a Bearer token over HTTPS-only settings
func LoginHandler(c buffalo.Context) error {
    // Validate credentials
    token := "example.jwt.token"
    c.Response().Header().Set("Authorization", "Bearer "+token)
    // Ensure secure transmission; rely on TLS for encryption in transit
    c.Response().Header().Set("Strict-Transport-Security", "max-age=31536000; includeSubDomains")
    // Avoid exposing token in logs or body if not necessary
    return c.Render(200, r.JSON(map[string]string{"access_token": token}))
}

Infrastructure and Middleware Hardening

Use a reverse proxy or load balancer to terminate TLS and set X-Forwarded-Proto headers appropriately. In Buffalo, you can trust forwarded headers securely when behind a trusted proxy to avoid downgrade attacks. Also set secure cookie attributes for session cookies that may carry tokens.

// In app_actions.go or an init function when behind a trusted proxy
app := App()
app.Use(middleware.ProxyHeaders)
// Ensure cookies are marked Secure in production
if ENV == "production" {
    app.Sessions().SetOptions(&middleware.SessionOptions{
        Secure: true,
        HttpOnly: true,
        SameSite: http.SameSiteStrictMode,
    })
}

Compliance and Testing

Verify that endpoints exchanging Bearer tokens are included in TLS scope during scans. middleBrick’s encryption and inventory checks can surface Missing TLS findings and map them to OWASP API Top 10 and relevant compliance frameworks. Combine scanner feedback with manual verification using tools like curl to confirm HTTPS is required and tokens are not leaked over HTTP.