prosody-modules
f853a1a3aa15
mod_auth_ccert/mod_auth_ccert.lua

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mod_auth_ccert/mod_auth_ccert.lua @ 1062:f853a1a3aa15

mod_auth_ccert: Initial commit of authentication module for using CA-issued client certificates
author Kim Alvefur <zash@zash.se>
date Thu, 13 Jun 2013 21:25:12 +0200
child 1063:b2a4679e7d20
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rev   line source
1062
f853a1a3aa15 mod_auth_ccert: Initial commit of authentication module for using CA-issued client certificates
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1 -- Copyright (C) 2013 Kim Alvefur
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2 --
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3 -- This file is MIT/X11 licensed.
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4
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5 local jid_compare = require "util.jid".compare;
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6 local jid_split = require "util.jid".prepped_split;
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7 local new_sasl = require "util.sasl".new;
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8 local log = module._log;
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9 local subject_alternative_name = "2.5.29.17";
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10 local id_on_xmppAddr = "1.3.6.1.5.5.7.8.5";
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11 local now = os.time;
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12
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13 function get_sasl_handler(session)
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14 return new_sasl(module.host, {
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15 external = session.secure and function(authz)
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16 if session.secure then
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17 -- getpeercertificate() on a TCP connection would be bad, abort!
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18 (session.log or log)("error", "How did you manage to select EXTERNAL without TLS?");
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19 return nil, false;
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20 end
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21 local sock = session.conn:socket();
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22 local cert = sock:getpeercertificate();
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23 if not cert then
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24 (session.log or log)("warn", "No certificate provided");
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25 return nil, false;
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26 end
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27
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28 if not cert:validat(now()) then
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29 (session.log or log)("warn", "Client certificate expired")
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30 return nil, "expired";
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31 end
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32
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33 local chain_valid, chain_errors = sock:getpeerverification();
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34 if not chain_valid then
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35 (session.log or log)("warn", "Invalid client certificate chain");
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36 for i, error in ipairs(chain_errors) do
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37 (session.log or log)("warn", "%d: %s", i, table.concat(chain_errors, ", "));
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38 end
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39 return nil, false;
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40 end
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41
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42 local extensions = cert:extensions();
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43 local SANs = extensions[subject_alternative_name];
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44 local xmppAddrs = SANs and SANs[id_on_xmppAddr];
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45
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46 if not xmppAddrs then
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47 (session.log or log)("warn", "Client certificate contains no xmppAddrs");
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48 return nil, false;
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49 end
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50
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51 for i=1,#xmppAddrs do
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52 if authz == "" or jid_compare(authz, xmppAddrs[i]) then
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53 (session.log or log)("debug", "xmppAddrs[%d] %q matches authz %q", i, xmppAddrs[i], authz)
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54 local username, host = jid_split(xmppAddrs[i]);
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55 if host == module.host then
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56 return username, true
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57 end
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58 end
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59 end
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60 end
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61 });
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62 end
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63
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64 module:provides "auth";