view mod_tls_policy/README.markdown @ 5957:e8bf46a7bb27

mod_http_oauth2: Ensure URL ports are integer in correct range LuaSocket is weird and thinks ports should be strings
author Kim Alvefur <zash@zash.se>
date Thu, 29 Aug 2024 18:03:23 +0200
parents ad24f8993385
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---
summary: Cipher policy enforcement with application level error reporting
...

# Introduction

This module arose from discussions at the XMPP Summit about enforcing
better ciphers in TLS. It may seem attractive to disallow some insecure
ciphers or require forward secrecy, but doing this at the TLS level
would the user with an unhelpful "Encryption failed" message. This
module does this enforcing at the application level, allowing better
error messages.

# Configuration

First, download and add the module to `module_enabled`.  Then you can
decide on what policy you want to have.

Requiring ciphers with forward secrecy is the most simple to set up.

``` lua
tls_policy = "FS" -- allow only ciphers that enable forward secrecy
```

A more complicated example:

``` lua
tls_policy = {
  c2s = {
    encryption = "AES"; -- Require AES (or AESGCM) encryption
    protocol = "TLSv1.2"; -- and TLSv1.2
    bits = 128; -- and at least 128 bits (FIXME: remember what this meant)
  }
  s2s = {
    cipher = "AESGCM"; -- Require AESGCM ciphers
    protocol = "TLSv1.[12]"; -- and TLSv1.1 or 1.2
    authentication = "RSA"; -- with RSA authentication
  };
}
```

# Compatibility

Requires LuaSec 0.5