Missing Tls in Buffalo with Basic Auth

Using HTTP Basic Authentication in a Buffalo application without TLS exposes credentials and session tokens to interception. Basic Auth encodes a username and password with Base64, which is easily reversible and provides no confidentiality. When no TLS is enforced, any network path between the client and the Buffalo server can observe the Authorization header in plaintext, enabling credential theft via passive sniffing or active interception.

In a Buffalo application, authentication logic that relies on Basic Auth typically reads the header and validates credentials against a user store. If TLS is absent, an attacker on the same network or a compromised router can capture the raw HTTP request. This exposure is especially critical in environments such as public Wi‑Fi, corporate networks without strict encryption, or when traffic traverses external or shared infrastructure. The risk is not theoretical; tools that capture unencrypted HTTP traffic trivially reveal the Base64 string sent in the header.

Missing TLS also undermines integrity. Without transport-layer protections, an attacker can modify requests in-flight, such as altering the Authorization header or injecting malicious requests that appear to come from a legitimate user. In combination with Basic Auth, this can lead to privilege escalation if an attacker replays or modifies credentials to gain higher access. Confidentiality, integrity, and authentication all depend on protecting the channel, and Buffalo applications that skip TLS leave these guarantees unfulfilled.

When scanning such an API with middleBrick, findings related to unencrypted transport and weak authentication mechanisms are surfaced alongside checks for Input Validation and Authentication. The scanner tests the unauthenticated attack surface and, where relevant, flags missing TLS as a precursor to authentication bypass or credential exposure. Remediation guidance typically centers on enforcing HTTPS and ensuring that Basic Auth is only used over encrypted connections, complemented by secure credential storage and transport protections.

To secure Basic Auth in Buffalo, you must enforce HTTPS and avoid sending credentials over plaintext connections. The framework does not inherently provide transport security, so configuration and code changes are required at the application and infrastructure levels.

Enforce HTTPS in Buffalo

Configure your Buffalo app to redirect HTTP to HTTPS and ensure secure cookies. Use secure headers and restrict insecure transports.

// app.js (or app.go) — enforce HTTPS and secure headers
package app

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

func App() *buffalo.App {
	app := buffalo.New(buffalo.Options{
		Env:         ENV,
		SessionStore: &middleware.SessionCookieStore{},
	})

	// Force HTTPS in production
	if ENV == buffalo.EnvProduction {
		app.Use(middleware.URLFormat)
		app.Use(middleware.Secure)
		app.Wrap(redirectToHTTPS)
	}

	// Security middleware
	app.Use(middleware.CSRF)
	app.Use(middleware.ParamsParser)
	app.Use(middleware.PopTransaction)

	return app
}

func redirectToHTTPS(next buffalo.Handler) buffalo.Handler {
	return func(c buffalo.Context) error {
		if 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 Basic Auth Implementation

When using Basic Auth, validate credentials over TLS and avoid storing passwords in plaintext. Use secure password hashing and ensure the Authorization header is only accepted over HTTPS.

// handlers/auth.go — secure Basic Auth handler
package handlers

import (
	"net/http"
	"strings"

	"golang.org/x/crypto/bcrypt"
)

func BasicAuthMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// Only accept over TLS
		if r.TLS == nil {
			http.Error(w, "HTTPS required", http.StatusForbidden)
			return
		}

		auth := r.Header.Get("Authorization")
		if auth == "" || !strings.HasPrefix(auth, "Basic ") {
			http.Error(w, "Authorization header missing", http.StatusUnauthorized)
			return
		}

		payload, err := base64.StdEncoding.DecodeString(auth[6:])
		if err != nil {
			http.Error(w, "Invalid authorization header", http.StatusBadRequest)
			return
		}

		pair := strings.SplitN(string(payload), ":", 2)
		if len(pair) != 2 {
			http.Error(w, "Invalid credentials format", http.StatusBadRequest)
			return
		}

		user, pass := pair[0], pair[1]
		storedHash, err := getUserPasswordHash(user)
		if err != nil || !bcrypt.CompareHashAndPassword([]byte(storedHash), []byte(pass)) {
			http.Error(w, "Invalid credentials", http.StatusUnauthorized)
			return
		}

		// Proceed to next handler
		next.ServeHTTP(w, r)
	})
}

func getUserPasswordHash(username string) (string, error) {
	// Retrieve hashed password from secure store (e.g., database)
	// Example hash generated with bcrypt.GenerateFromPassword
	return "$2a$10$abc123...hashed...", nil
}

Infrastructure and Deployment Considerations

Ensure termination points (load balancers, reverse proxies) enforce TLS and forward trusted headers. Configure TLS certificates and use HSTS to prevent downgrade attacks. Do not rely on Basic Auth over non-TLS channels, even in internal networks.