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annotate mod_s2s_auth_dane/mod_s2s_auth_dane.lua @ 1351:a052740bbf48

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mod_s2s_auth_dane: Back to _port._tcp.srvtarget.example.net
author Kim Alvefur <zash@zash.se>
date Tue, 18 Mar 2014 15:12:11 +0100
parents cda335db2cbb
children b0f780d3a24e
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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 -- In your DNS, put
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7 -- _xmpp-server.example.com. IN TLSA 3 0 1 <sha256 hash of certificate>
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8 --
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9 -- Known issues:
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10 -- Race condition
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11 -- Could be done much cleaner if mod_s2s was using util.async
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12 --
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13 -- TODO Things to test/handle:
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14 -- Negative or bogus answers
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15 -- No encryption offered
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16 -- Different hostname before and after STARTTLS - mod_s2s should complain
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17 -- Interaction with Dialback
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19 module:set_global();
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21 local type = type;
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22 local t_insert = table.insert;
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23 local set = require"util.set";
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24 local dns_lookup = require"net.adns".lookup;
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25 local hashes = require"util.hashes";
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26 local base64 = require"util.encodings".base64;
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27 local idna_to_ascii = require "util.encodings".idna.to_ascii;
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29 local s2sout = module:depends"s2s".route_to_new_session.s2sout;
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30
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31 local pat = "%-%-%-%-%-BEGIN ([A-Z ]+)%-%-%-%-%-\r?\n"..
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32 "([0-9A-Za-z=+/\r\n]*)\r?\n%-%-%-%-%-END %1%-%-%-%-%-";
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33 local function pem2der(pem)
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34 local typ, data = pem:match(pat);
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35 if typ and data then
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36 return base64.decode(data), typ;
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37 end
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38 end
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39 local use_map = { ["DANE-EE"] = 3; ["DANE-TA"] = 2; ["PKIX-EE"] = 1; ["PKIX-CA"] = 0 }
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41 local implemented_uses = set.new { "DANE-EE", "PKIX-EE" };
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42 local configured_uses = module:get_option_set("dane_uses", { "DANE-EE" });
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43 local enabled_uses = set.intersection(implemented_uses, configured_uses) / function(use) return use_map[use] end;
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44
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45 local function dane_lookup(host_session, cb, a,b,c,e)
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46 if host_session.dane ~= nil then return end
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47 if host_session.direction == "incoming" then
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48 local name = idna_to_ascii(host_session.from_host);
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49 if not name then return end
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50 local handle = dns_lookup(function (answer)
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51 if not answer.secure then return end
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52 if #answer == 1 and answer[1].srv.target == '.' then return end
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53 local srv_hosts = { answer = answer };
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54 local dane = {};
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55 host_session.dane = dane;
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56 host_session.srv_hosts = srv_hosts;
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57 local n = #answer
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58 for _, record in ipairs(answer) do
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59 t_insert(srv_hosts, record.srv);
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60 dns_lookup(function(dane_answer)
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61 n = n - 1;
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62 if dane_answer.bogus then
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63 t_insert(dane, { bogus = dane_answer.bogus });
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64 elseif dane_answer.secure then
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65 for _, record in ipairs(dane_answer) do
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66 t_insert(dane, record);
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67 end
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68 end
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69 if n == 0 and cb then return cb(a,b,c,e); end
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70 end, ("_%d._tcp.%s."):format(record.srv.port, record.srv.target), "TLSA");
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71 end
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72 end, "_xmpp-server._tcp."..name..".", "SRV");
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73 return true;
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74 elseif host_session.direction == "outgoing" then
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75 local srv_choice = host_session.srv_hosts[host_session.srv_choice];
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76 host_session.dane = dns_lookup(function(answer)
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77 if answer and (answer.secure and #answer > 0) or answer.bogus then
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78 srv_choice.dane = answer;
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79 else
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80 srv_choice.dane = false;
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81 end
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82 host_session.dane = srv_choice.dane;
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83 if cb then return cb(a,b,c,e); end
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84 end, ("_%d._tcp.%s."):format(srv_choice.port, srv_choice.target), "TLSA");
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85 return true;
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86 end
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87 end
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88
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89 local _try_connect = s2sout.try_connect;
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90 function s2sout.try_connect(host_session, connect_host, connect_port, err)
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91 if not err and dane_lookup(host_session, _try_connect, host_session, connect_host, connect_port, err) then
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92 return true;
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93 end
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94 return _try_connect(host_session, connect_host, connect_port, err);
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95 end
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96
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97 function module.add_host(module)
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98 module:hook("s2s-stream-features", function(event)
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99 -- dane_lookup(origin, origin.from_host);
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100 dane_lookup(event.origin);
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101 end, 1);
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102
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103 module:hook("s2s-authenticated", function(event)
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104 local session = event.session;
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105 if session.dane and not session.secure then
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106 -- TLSA record but no TLS, not ok.
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107 -- TODO Optional?
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108 -- Bogus replies should trigger this path
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109 -- How does this interact with Dialback?
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110 session:close({
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111 condition = "policy-violation",
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112 text = "Encrypted server-to-server communication is required but was not "
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113 ..((session.direction == "outgoing" and "offered") or "used")
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114 });
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115 return false;
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116 end
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117 end);
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118 end
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119
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120 module:hook("s2s-check-certificate", function(event)
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121 local session, cert = event.session, event.cert;
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122 local dane = session.dane;
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123 if type(dane) == "table" then
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124 local use, select, match, tlsa, certdata, match_found, supported_found;
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125 for i = 1, #dane do
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126 tlsa = dane[i].tlsa;
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127 module:log("debug", "TLSA %s %s %s %d bytes of data", tlsa:getUsage(), tlsa:getSelector(), tlsa:getMatchType(), #tlsa.data);
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128 use, select, match, certdata = tlsa.use, tlsa.select, tlsa.match;
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129
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130 if enabled_uses:contains(use) then
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131 -- PKIX-EE or DANE-EE
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132 if use == 1 or use == 3 then
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133 supported_found = true
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134
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135 if select == 0 then
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136 certdata = pem2der(cert:pem());
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137 elseif select == 1 and cert.pubkey then
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138 certdata = pem2der(cert:pubkey()); -- Not supported in stock LuaSec
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139 else
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140 module:log("warn", "DANE selector %s is unsupported", tlsa:getSelector() or select);
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141 end
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142
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143 if match == 1 then
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144 certdata = hashes.sha256(certdata);
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145 elseif match == 2 then
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146 certdata = hashes.sha512(certdata);
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147 elseif match ~= 0 then
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148 module:log("warn", "DANE match rule %s is unsupported", tlsa:getMatchType() or match);
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149 certdata = nil;
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150 end
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151
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152 -- Should we check if the cert subject matches?
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153 if certdata and certdata == tlsa.data then
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154 (session.log or module._log)("info", "DANE validation successful");
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155 session.cert_identity_status = "valid";
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156 if use == 3 then -- DANE-EE, chain status equals DNSSEC chain status
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157 session.cert_chain_status = "valid";
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158 -- for usage 1, PKIX-EE, the chain has to be valid already
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159 end
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160 match_found = true;
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161 break;
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162 end
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163 end
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164 end
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165 end
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166 if supported_found and not match_found or dane.bogus then
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167 -- No TLSA matched or response was bogus
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168 (session.log or module._log)("warn", "DANE validation failed");
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169 session.cert_identity_status = "invalid";
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170 session.cert_chain_status = "invalid";
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171 end
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172 end
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173 end);
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174
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175 function module.unload()
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176 -- Restore the original try_connect function
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177 s2sout.try_connect = _try_connect;
1330
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178 end
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179