mod_s2s_auth_fingerprint: New module for authenticating s2s connections based on preconfigured fingerprints.
-- Copyright (C) 2013 Kim Alvefur
-- This file is MIT/X11 licensed.
module:set_global();
local digest_algo = module:get_option_string(module:get_name().."_digest", "sha1");
local fingerprints = {};
local function hashprep(h)
return tostring(h):lower():gsub(":","");
end
for host, set in pairs(module:get_option("s2s_trusted_fingerprints", {})) do
local host_set = {}
if type(set) == "table" then -- list of fingerprints
for i=1,#set do
host_set[hashprep(set[i])] = true;
end
else -- assume single fingerprint
host_set[hashprep(set)] = true;
end
fingerprints[host] = host_set;
end
module:hook("s2s-check-certificate", function(event)
local session, host, cert = event.session, event.host, event.cert;
local host_fingerprints = fingerprints[host];
if host_fingerprints then
local digest = cert:digest(digest_algo);
if host_fingerprints[digest] then
session.cert_chain_status = "valid";
session.cert_identity_status = "valid";
return true;
end
end
end);