mod_auth_ccert/mod_auth_ccert.lua
author Kim Alvefur <zash@zash.se>
Thu, 13 Jun 2013 21:25:12 +0200
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mod_auth_ccert: Initial commit of authentication module for using CA-issued client certificates
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-- Copyright (C) 2013 Kim Alvefur
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--
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-- This file is MIT/X11 licensed.
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local jid_compare = require "util.jid".compare;
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local jid_split = require "util.jid".prepped_split;
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local new_sasl = require "util.sasl".new;
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local log = module._log;
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local subject_alternative_name = "2.5.29.17";
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local id_on_xmppAddr = "1.3.6.1.5.5.7.8.5";
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local now = os.time;
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function get_sasl_handler(session)
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	return new_sasl(module.host, {
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		external = session.secure and function(authz)
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			if session.secure then
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				-- getpeercertificate() on a TCP connection would be bad, abort!
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				(session.log or log)("error", "How did you manage to select EXTERNAL without TLS?");
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				return nil, false;
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			end
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			local sock = session.conn:socket();
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			local cert = sock:getpeercertificate();
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			if not cert then
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				(session.log or log)("warn", "No certificate provided");
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				return nil, false;
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			end
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			if not cert:validat(now()) then
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				(session.log or log)("warn", "Client certificate expired")
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				return nil, "expired";
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			end
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			local chain_valid, chain_errors = sock:getpeerverification();
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			if not chain_valid then
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				(session.log or log)("warn", "Invalid client certificate chain");
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				for i, error in ipairs(chain_errors) do
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					(session.log or log)("warn", "%d: %s", i, table.concat(chain_errors, ", "));
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				end
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				return nil, false;
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			end
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			local extensions = cert:extensions();
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			local SANs = extensions[subject_alternative_name];
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			local xmppAddrs = SANs and SANs[id_on_xmppAddr];
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			if not xmppAddrs then
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				(session.log or log)("warn", "Client certificate contains no xmppAddrs");
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				return nil, false;
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			end
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			for i=1,#xmppAddrs do
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				if authz == "" or jid_compare(authz, xmppAddrs[i]) then
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					(session.log or log)("debug", "xmppAddrs[%d] %q matches authz %q", i, xmppAddrs[i], authz)
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					local username, host = jid_split(xmppAddrs[i]);
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					if host == module.host then
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						return username, true
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					end
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				end
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			end
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		end
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	});
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end
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module:provides "auth";