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annotate mod_s2s_auth_dane/mod_s2s_auth_dane.lua @ 1359:74769c0c79f8

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mod_s2s_auth_dane: Verify that the SRV is secure
author Kim Alvefur <zash@zash.se>
date Wed, 19 Mar 2014 14:33:10 +0100
parents 497e1df4b7ee
children 920ac9a8480b
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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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18
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19 module:set_global();
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20
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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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28
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29 if not dns_lookup.types or not dns_lookup.types.TLSA then
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30 module:log("error", "No TLSA support available, DANE will not be supported");
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31 return
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32 end
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33
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34 local s2sout = module:depends"s2s".route_to_new_session.s2sout;
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35
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36 local pat = "%-%-%-%-%-BEGIN ([A-Z ]+)%-%-%-%-%-\r?\n"..
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37 "([0-9A-Za-z=+/\r\n]*)\r?\n%-%-%-%-%-END %1%-%-%-%-%-";
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38 local function pem2der(pem)
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39 local typ, data = pem:match(pat);
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40 if typ and data then
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41 return base64.decode(data), typ;
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42 end
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43 end
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44 local use_map = { ["DANE-EE"] = 3; ["DANE-TA"] = 2; ["PKIX-EE"] = 1; ["PKIX-CA"] = 0 }
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46 local implemented_uses = set.new { "DANE-EE", "PKIX-EE" };
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47 local configured_uses = module:get_option_set("dane_uses", { "DANE-EE" });
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48 local enabled_uses = set.intersection(implemented_uses, configured_uses) / function(use) return use_map[use] end;
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49
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50 local function dane_lookup(host_session, cb, a,b,c,e)
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51 if host_session.dane ~= nil then return end
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52 if host_session.direction == "incoming" then
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53 local name = idna_to_ascii(host_session.from_host);
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54 if not name then return end
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55 host_session.dane = dns_lookup(function (answer)
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56 if not answer.secure then
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57 if cb then return cb(a,b,c,e); end
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58 return;
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59 end
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60 local n = #answer
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61 if n == 0 then if cb then return cb(a,b,c,e); end return end
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62 if n == 1 and answer[1].srv.target == '.' then return end
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63 local srv_hosts = { answer = answer };
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64 local dane = {};
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65 host_session.dane = dane;
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66 host_session.srv_hosts = srv_hosts;
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67 for _, record in ipairs(answer) do
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68 t_insert(srv_hosts, record.srv);
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69 dns_lookup(function(dane_answer)
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70 n = n - 1;
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71 if dane_answer.bogus then
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72 t_insert(dane, { bogus = dane_answer.bogus });
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73 elseif dane_answer.secure then
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74 for _, record in ipairs(dane_answer) do
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75 t_insert(dane, record);
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76 end
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77 end
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78 if n == 0 and cb then return cb(a,b,c,e); end
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79 end, ("_%d._tcp.%s."):format(record.srv.port, record.srv.target), "TLSA");
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80 end
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81 end, "_xmpp-server._tcp."..name..".", "SRV");
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82 return true;
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83 elseif host_session.direction == "outgoing" then
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84 local srv_hosts = host_session.srv_hosts;
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85 if not ( srv_hosts and srv_hosts.answer and srv_hosts.answer.secure ) then return end
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86 local srv_choice = srv_hosts[host_session.srv_choice];
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87 host_session.dane = dns_lookup(function(answer)
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88 if answer and (answer.secure and #answer > 0) or answer.bogus then
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89 srv_choice.dane = answer;
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90 else
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91 srv_choice.dane = false;
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92 end
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93 host_session.dane = srv_choice.dane;
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94 if cb then return cb(a,b,c,e); end
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95 end, ("_%d._tcp.%s."):format(srv_choice.port, srv_choice.target), "TLSA");
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96 return true;
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97 end
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98 end
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99
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100 local _try_connect = s2sout.try_connect;
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101 function s2sout.try_connect(host_session, connect_host, connect_port, err)
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102 if not err and dane_lookup(host_session, _try_connect, host_session, connect_host, connect_port, err) then
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103 return true;
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104 end
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105 return _try_connect(host_session, connect_host, connect_port, err);
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106 end
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107
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108 function module.add_host(module)
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109 module:hook("s2s-stream-features", function(event)
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110 -- dane_lookup(origin, origin.from_host);
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111 dane_lookup(event.origin);
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112 end, 1);
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113
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114 module:hook("s2s-authenticated", function(event)
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115 local session = event.session;
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116 if session.dane and not session.secure then
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117 -- TLSA record but no TLS, not ok.
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118 -- TODO Optional?
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119 -- Bogus replies should trigger this path
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120 -- How does this interact with Dialback?
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121 session:close({
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122 condition = "policy-violation",
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123 text = "Encrypted server-to-server communication is required but was not "
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124 ..((session.direction == "outgoing" and "offered") or "used")
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125 });
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126 return false;
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127 end
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128 end);
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129 end
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130
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131 module:hook("s2s-check-certificate", function(event)
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132 local session, cert = event.session, event.cert;
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133 local dane = session.dane;
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134 if type(dane) == "table" then
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135 local use, select, match, tlsa, certdata, match_found, supported_found;
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136 for i = 1, #dane do
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137 tlsa = dane[i].tlsa;
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138 module:log("debug", "TLSA %s %s %s %d bytes of data", tlsa:getUsage(), tlsa:getSelector(), tlsa:getMatchType(), #tlsa.data);
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139 use, select, match, certdata = tlsa.use, tlsa.select, tlsa.match;
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140
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141 if enabled_uses:contains(use) then
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142 -- PKIX-EE or DANE-EE
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143 if use == 1 or use == 3 then
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144 supported_found = true
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145
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146 if select == 0 then
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147 certdata = pem2der(cert:pem());
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148 elseif select == 1 and cert.pubkey then
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149 certdata = pem2der(cert:pubkey()); -- Not supported in stock LuaSec
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150 else
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151 module:log("warn", "DANE selector %s is unsupported", tlsa:getSelector() or select);
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152 end
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153
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154 if match == 1 then
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155 certdata = certdata and hashes.sha256(certdata);
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156 elseif match == 2 then
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157 certdata = certdata and hashes.sha512(certdata);
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158 elseif match ~= 0 then
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159 module:log("warn", "DANE match rule %s is unsupported", tlsa:getMatchType() or match);
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160 certdata = nil;
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161 end
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162
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163 -- Should we check if the cert subject matches?
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164 if certdata and certdata == tlsa.data then
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165 (session.log or module._log)("info", "DANE validation successful");
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166 session.cert_identity_status = "valid";
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167 if use == 3 then -- DANE-EE, chain status equals DNSSEC chain status
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168 session.cert_chain_status = "valid";
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169 -- for usage 1, PKIX-EE, the chain has to be valid already
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170 end
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171 match_found = true;
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172 break;
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173 end
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174 end
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175 end
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176 end
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177 if supported_found and not match_found or dane.bogus then
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178 -- No TLSA matched or response was bogus
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179 (session.log or module._log)("warn", "DANE validation failed");
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180 session.cert_identity_status = "invalid";
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181 session.cert_chain_status = "invalid";
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182 end
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183 end
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184 end);
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185
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186 function module.unload()
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187 -- Restore the original try_connect function
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188 s2sout.try_connect = _try_connect;
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189 end
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190