mirror of
https://github.com/syntrex-lab/gomcp.git
synced 2026-05-04 08:42:36 +02:00
80 lines
2.6 KiB
Go
80 lines
2.6 KiB
Go
package httpserver
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import (
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"net/http"
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)
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// corsMiddleware adds CORS headers with strict origin validation.
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// Production: SetCORSOrigins should be called with ["https://syntrex.pro"]
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func corsMiddleware(origins []string) func(http.Handler) http.Handler {
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allowAll := false
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allowedSet := make(map[string]bool, len(origins))
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for _, o := range origins {
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if o == "*" {
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allowAll = true
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}
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allowedSet[o] = true
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}
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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reqOrigin := r.Header.Get("Origin")
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if reqOrigin != "" {
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if !allowAll && !allowedSet[reqOrigin] {
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http.Error(w, "CORS origin not allowed", http.StatusForbidden)
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return
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}
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w.Header().Set("Access-Control-Allow-Origin", reqOrigin)
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w.Header().Set("Vary", "Origin")
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} else if allowAll {
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w.Header().Set("Access-Control-Allow-Origin", "*")
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}
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w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE, OPTIONS")
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w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization, X-API-Key")
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w.Header().Set("Access-Control-Allow-Credentials", "true")
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w.Header().Set("Access-Control-Max-Age", "86400")
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// Handle preflight
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if r.Method == http.MethodOptions {
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w.WriteHeader(http.StatusNoContent)
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return
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}
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next.ServeHTTP(w, r)
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})
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}
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}
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// securityHeadersMiddleware adds defense-in-depth headers to all responses.
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// Mitigates XSS, clickjacking, MIME sniffing, and information leak vectors.
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func securityHeadersMiddleware(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// Prevent MIME type sniffing (IE/Chrome auto-exec attacks)
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w.Header().Set("X-Content-Type-Options", "nosniff")
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// Block iframe embedding (clickjacking defense)
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w.Header().Set("X-Frame-Options", "DENY")
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// XSS filter (legacy browsers)
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w.Header().Set("X-XSS-Protection", "1; mode=block")
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// Referrer leak prevention (no full URL in Referer header)
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w.Header().Set("Referrer-Policy", "strict-origin-when-cross-origin")
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// Content Security Policy — API only, no inline scripts
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w.Header().Set("Content-Security-Policy", "default-src 'none'; frame-ancestors 'none'")
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// Permissions Policy — deny all sensitive browser APIs
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w.Header().Set("Permissions-Policy", "camera=(), microphone=(), geolocation=(), interest-cohort=()")
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// Force HTTPS in production (1 year, include subdomains)
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w.Header().Set("Strict-Transport-Security", "max-age=31536000; includeSubDomains")
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// Hide server identity
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w.Header().Set("X-Powered-By", "")
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w.Header().Del("Server")
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next.ServeHTTP(w, r)
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})
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}
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