view mod_tls_policy/README.markdown @ 4127:e9e10ec1b91c

mod_firewall: Add checkcerts option for HTTP lists, cert verification disabled when SNI unsupported This provides a balance between security and usability. SNI is supported in Prosody trunk and in Prosody 0.11 from commit 30d3f6f85eb8 (scheduled for 0.11.7).
author Matthew Wild <mwild1@gmail.com>
date Tue, 15 Sep 2020 11:49:55 +0100
parents ad24f8993385
children
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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