mox/mox-/safeheaders.go

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improve http request handling for internal services and multiple domains per listener, you could enable the admin/account/webmail/webapi handlers. but that would serve those services on their configured paths (/admin/, /, /webmail/, /webapi/) on all domains mox would be webserving, including any non-mail domains. so your www.example/admin/ would be serving the admin web interface, with no way to disabled that. with this change, the admin interface is only served on requests to (based on Host header): - ip addresses - the listener host name (explicitly configured in the listener, with fallback to global hostname) - "localhost" (for ssh tunnel/forwarding scenario's) the account/webmail/webapi interfaces are served on the same domains as the admin interface, and additionally: - the client settings domains, as optionally configured in each Domain in domains.conf. typically "mail.<yourdomain>". this means the internal services are no longer served on other domains configured in the webserver, e.g. www.example.org/admin/ will not be handled specially. the order of evaluation of routes/services is also changed: before this change, the internal handlers would always be evaluated first. with this change, only the system handlers for MTA-STS/autoconfig/ACME-validation will be evaluated first. then the webserver handlers. and finally the internal services (admin/account/webmail/webapi). this allows an admin to configure overrides for some of the domains (per hostname-matching rules explained above) that would normally serve these services. webserver handlers can now be configured that pass the request to an internal service: in addition to the existing static/redirect/forward config options, there is now an "internal" config option, naming the service (admin/account/webmail/webapi) for handling the request. this allows enabling the internal services on custom domains. for issue #160 by TragicLifeHu, thanks for reporting!
2024-05-11 12:13:14 +03:00
package mox
import (
"net/http"
)
// Set some http headers that should prevent potential abuse. Better safe than sorry.
func SafeHeaders(fn http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
h := w.Header()
h.Set("X-Frame-Options", "deny")
h.Set("X-Content-Type-Options", "nosniff")
h.Set("Content-Security-Policy", "default-src 'self' 'unsafe-inline' data:")
h.Set("Referrer-Policy", "same-origin")
fn.ServeHTTP(w, r)
})
}