prosody-modules
e6e45ef1608b
mod_auth_ccert/mod_auth_ccert.lua

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mod_auth_ccert/mod_auth_ccert.lua @ 1808:e6e45ef1608b

CONTRIBUTING: Update guidelines and URL to hg repo
author Kim Alvefur <zash@zash.se>
date Mon, 31 Aug 2015 17:28:14 +0200
parent 1325:b21236b6b8d8
child 3041:86acfa44dc24
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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 now = os.time;
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9 local log = module._log;
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10
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11 local subject_alternative_name = "2.5.29.17";
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12 local id_on_xmppAddr = "1.3.6.1.5.5.7.8.5";
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13 local oid_emailAddress = "1.2.840.113549.1.9.1";
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15 local cert_match = module:get_option("certificate_match", "xmppaddr");
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16
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17 local username_extractor = {};
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18
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19 function username_extractor.xmppaddr(cert, authz, session)
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20 local extensions = cert:extensions();
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21 local SANs = extensions[subject_alternative_name];
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22 local xmppAddrs = SANs and SANs[id_on_xmppAddr];
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23
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24 if not xmppAddrs then
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25 (session.log or log)("warn", "Client certificate contains no xmppAddrs");
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26 return nil, false;
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27 end
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29 for i=1,#xmppAddrs do
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30 if authz == "" or jid_compare(authz, xmppAddrs[i]) then
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31 (session.log or log)("debug", "xmppAddrs[%d] %q matches authz %q", i, xmppAddrs[i], authz)
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32 local username, host = jid_split(xmppAddrs[i]);
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33 if host == module.host then
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34 return username, true
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35 end
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36 end
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37 end
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38 end
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39
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40 function username_extractor.email(cert)
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41 local subject = cert:subject();
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42 for i=1,#subject do
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43 local ava = subject[i];
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44 if ava.oid == oid_emailAddress then
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45 local username, host = jid_split(ava.value);
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46 if host == module.host then
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47 return username, true
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48 end
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49 end
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50 end
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51 end
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52
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53 local find_username = username_extractor[cert_match];
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54 if not find_username then
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55 module:log("error", "certificate_match = %q is not supported");
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56 return
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57 end
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58
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59
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60 function get_sasl_handler(session)
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61 return new_sasl(module.host, {
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62 external = session.secure and function(authz)
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63 if not session.secure then
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64 -- getpeercertificate() on a TCP connection would be bad, abort!
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65 (session.log or log)("error", "How did you manage to select EXTERNAL without TLS?");
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66 return nil, false;
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67 end
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68 local sock = session.conn:socket();
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69 local cert = sock:getpeercertificate();
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70 if not cert then
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71 (session.log or log)("warn", "No certificate provided");
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72 return nil, false;
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73 end
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74
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75 if not cert:validat(now()) then
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76 (session.log or log)("warn", "Client certificate expired")
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77 return nil, "expired";
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78 end
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79
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80 local chain_valid, chain_errors = sock:getpeerverification();
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81 if not chain_valid then
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82 (session.log or log)("warn", "Invalid client certificate chain");
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83 for i, error in ipairs(chain_errors) do
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84 (session.log or log)("warn", "%d: %s", i, table.concat(error, ", "));
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85 end
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86 return nil, false;
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87 end
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88
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89 return find_username(cert, authz, session);
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90 end
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91 });
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92 end
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93
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94 module:provides "auth";