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annotate mod_s2s_auth_dane/mod_s2s_auth_dane.lua @ 1347:52b419885f0a

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mod_s2s_auth_dane: Simplify, but diverge from DANE-SRV draft. Will now look for _xmpp-server.example.com IN TLSA for both directions
author Kim Alvefur <zash@zash.se>
date Fri, 14 Mar 2014 14:15:56 +0100
parents 47d3c1c8a176
children 6191613959dc
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1 -- mod_s2s_auth_dane
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2 -- Copyright (C) 2013-2014 Kim Alvefur
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3 --
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4 -- This file is MIT/X11 licensed.
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5 --
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6 -- Could be done much cleaner if mod_s2s was using util.async
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7
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8
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9 module:set_global();
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10
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11 local dns_lookup = require"net.adns".lookup;
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12 local hashes = require"util.hashes";
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13 local base64 = require"util.encodings".base64;
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14 local idna_to_ascii = require "util.encodings".idna.to_ascii;
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15
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16 local s2sout = module:depends"s2s".route_to_new_session.s2sout;
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17
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18 local bogus = {};
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19
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20 local pat = "%-%-%-%-%-BEGIN ([A-Z ]+)%-%-%-%-%-\r?\n"..
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21 "([0-9A-Za-z=+/\r\n]*)\r?\n%-%-%-%-%-END %1%-%-%-%-%-";
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22 local function pem2der(pem)
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23 local typ, data = pem:match(pat);
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24 if typ and data then
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25 return base64.decode(data), typ;
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26 end
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27 end
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28
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29 -- TODO Things to test/handle:
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30 -- Negative or bogus answers
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31 -- No SRV records
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32 -- No encryption offered
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33 -- Different hostname before and after STARTTLS - mod_s2s should complain
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34
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35 local function dane_lookup(host_session, name, cb, a,b,c)
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36 if host_session.dane ~= nil then return false; end
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37 local ascii_host = name and idna_to_ascii(name);
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38 if not ascii_host then return false; end
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39 host_session.dane = dns_lookup(function(answer)
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40 if answer and (answer.secure and #answer > 0) then
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41 host_session.dane = answer;
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42 elseif answer.bogus then
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43 host_session.dane = bogus;
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44 else
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45 host_session.dane = false;
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46 end
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47 if cb then return cb(a,b,c); end
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48 end, ("_xmpp-server.%s."):format(ascii_host), "TLSA");
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49 host_session.connecting = true;
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50 return true;
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51 end
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52
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53 local _attempt_connection = s2sout.attempt_connection;
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54 function s2sout.attempt_connection(host_session, err)
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55 if not err and dane_lookup(host_session, host_session.to_host, _attempt_connection, host_session, err) then
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56 return true;
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57 end
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58 return _attempt_connection(host_session, err);
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59 end
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60
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61 function module.add_host(module)
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62 module:hook("s2s-stream-features", function(event)
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63 local origin = event.origin;
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64 dane_lookup(origin, origin.from_host);
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65 end, 1);
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66
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67 module:hook("s2s-authenticated", function(event)
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68 local session = event.session;
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69 if session.dane and not session.secure then
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70 -- TLSA record but no TLS, not ok.
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71 -- TODO Optional?
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72 -- Bogus replies should trigger this path
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73 -- How does this interact with Dialback?
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74 session:close({
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75 condition = "policy-violation",
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76 text = "Encrypted server-to-server communication is required but was not "
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77 ..((session.direction == "outgoing" and "offered") or "used")
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78 });
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79 return false;
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80 end
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81 end);
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82 end
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83
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84 module:hook("s2s-check-certificate", function(event)
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85 local session, cert = event.session, event.cert;
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86 local dane = session.dane;
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87 if type(dane) == "table" then
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88 local use, select, match, tlsa, certdata, match_found, supported_found;
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89 for i = 1, #dane do
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90 tlsa = dane[i].tlsa;
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91 module:log("debug", "TLSA %s %s %s %d bytes of data", tlsa:getUsage(), tlsa:getSelector(), tlsa:getMatchType(), #tlsa.data);
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92 use, select, match, certdata = tlsa.use, tlsa.select, tlsa.match;
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93
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94 -- PKIX-EE or DANE-EE
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95 if use == 1 or use == 3 then
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96 supported_found = true
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97
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98 if select == 0 then
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99 certdata = pem2der(cert:pem());
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100 elseif select == 1 and cert.pubkey then
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101 certdata = pem2der(cert:pubkey()); -- Not supported in stock LuaSec
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102 else
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103 module:log("warn", "DANE selector %s is unsupported", tlsa:getSelector() or select);
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104 end
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105
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106 if match == 1 then
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107 certdata = hashes.sha256(certdata);
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108 elseif match == 2 then
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109 certdata = hashes.sha512(certdata);
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110 elseif match ~= 0 then
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111 module:log("warn", "DANE match rule %s is unsupported", tlsa:getMatchType() or match);
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112 certdata = nil;
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113 end
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114
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115 -- Should we check if the cert subject matches?
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116 if certdata and certdata == tlsa.data then
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117 (session.log or module._log)("info", "DANE validation successful");
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118 session.cert_identity_status = "valid";
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119 if use == 3 then -- DANE-EE, chain status equals DNSSEC chain status
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120 session.cert_chain_status = "valid";
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121 -- for usage 1, PKIX-EE, the chain has to be valid already
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122 end
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123 match_found = true;
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124 break;
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125 end
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126 end
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127 end
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128 if supported_found and not match_found or dane.bogus then
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129 -- No TLSA matched or response was bogus
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130 (session.log or module._log)("warn", "DANE validation failed");
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131 session.cert_identity_status = "invalid";
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132 session.cert_chain_status = "invalid";
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133 end
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134 end
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135 end);
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136
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137 function module.unload()
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138 -- Restore the original attempt_connection function
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139 s2sout.attempt_connection = _attempt_connection;
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140 end
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141