prosody-modules
cdc8f226a284
mod_s2s_auth_dane/mod_s2s_auth_dane.lua

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mod_s2s_auth_dane/mod_s2s_auth_dane.lua @ 1435:cdc8f226a284

mod_s2s_auth_dane: Pause connection only if needed
author Kim Alvefur <zash@zash.se>
date Thu, 12 Jun 2014 12:31:50 +0200
parent 1434:1caf971a2f0f
child 1436:3944e364ba88
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 -- Implements DANE and Secure Delegation using DNS SRV as described in
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7 -- http://tools.ietf.org/html/draft-miller-xmpp-dnssec-prooftype
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8 --
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9 -- Known issues:
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10 -- Could be done much cleaner if mod_s2s was using util.async
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11 --
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12 -- TODO Things to test/handle:
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13 -- Negative or bogus answers
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14 -- No encryption offered
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15 -- Different hostname before and after STARTTLS - mod_s2s should complain
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16 -- Interaction with Dialback
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17
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18 module:set_global();
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19
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20 local type = type;
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21 local t_insert = table.insert;
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22 local set = require"util.set";
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23 local dns_lookup = require"net.adns".lookup;
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24 local hashes = require"util.hashes";
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25 local base64 = require"util.encodings".base64;
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26 local idna_to_ascii = require "util.encodings".idna.to_ascii;
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27 local idna_to_unicode = require"util.encodings".idna.to_unicode;
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28 local nameprep = require"util.encodings".stringprep.nameprep;
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29 local cert_verify_identity = require "util.x509".verify_identity;
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30
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31 do
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32 local net_dns = require"net.dns";
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33 if not net_dns.types or not net_dns.types[52] then
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34 module:log("error", "No TLSA support available, DANE will not be supported");
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35 return
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36 end
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37 end
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38
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39 local pat = "%-%-%-%-%-BEGIN ([A-Z ]+)%-%-%-%-%-\r?\n"..
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40 "([0-9A-Za-z=+/\r\n]*)\r?\n%-%-%-%-%-END %1%-%-%-%-%-";
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41 local function pem2der(pem)
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42 local typ, data = pem:match(pat);
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43 if typ and data then
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44 return base64.decode(data), typ;
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45 end
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46 end
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47 local use_map = { ["DANE-EE"] = 3; ["DANE-TA"] = 2; ["PKIX-EE"] = 1; ["PKIX-CA"] = 0 }
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48
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49 local implemented_uses = set.new { "DANE-EE", "PKIX-EE" };
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50 if debug.getregistry()["SSL:Certificate"].__index.issued then
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51 -- Need cert:issued() for these
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52 implemented_uses:add("DANE-TA");
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53 implemented_uses:add("PKIX-CA");
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54 else
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55 module:log("warn", "Unable to support DANE-TA and PKIX-CA");
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56 end
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57 local configured_uses = module:get_option_set("dane_uses", { "DANE-EE", "DANE-TA" });
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58 local enabled_uses = set.intersection(implemented_uses, configured_uses) / function(use) return use_map[use] end;
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59
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60 local function dane_lookup(host_session, cb, a,b,c,e)
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61 if host_session.dane ~= nil then return end
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62 if host_session.direction == "incoming" then
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63 local name = host_session.from_host and idna_to_ascii(host_session.from_host);
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64 if not name then return end
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65 host_session.dane = dns_lookup(function (answer)
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66 host_session.dane = false;
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67 if not answer.secure then
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68 if cb then return cb(a,b,c,e); end
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69 return;
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70 end
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71 local n = #answer
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72 if n == 0 then if cb then return cb(a,b,c,e); end return end
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73 if n == 1 and answer[1].srv.target == '.' then return end
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74 local srv_hosts = { answer = answer };
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75 local dane = {};
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76 host_session.dane = dane;
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77 host_session.srv_hosts = srv_hosts;
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78 for _, record in ipairs(answer) do
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79 t_insert(srv_hosts, record.srv);
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80 dns_lookup(function(dane_answer)
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81 n = n - 1;
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82 if dane_answer.bogus then
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83 -- How to handle this?
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84 elseif dane_answer.secure then
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85 for _, record in ipairs(dane_answer) do
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86 t_insert(dane, record);
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87 end
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88 end
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89 if n == 0 and cb then return cb(a,b,c,e); end
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90 end, ("_%d._tcp.%s."):format(record.srv.port, record.srv.target), "TLSA");
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91 end
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92 end, "_xmpp-server._tcp."..name..".", "SRV");
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93 return true;
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94 elseif host_session.direction == "outgoing" then
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95 local srv_hosts = host_session.srv_hosts;
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96 if not ( srv_hosts and srv_hosts.answer and srv_hosts.answer.secure ) then return end
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97 local srv_choice = srv_hosts[host_session.srv_choice];
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98 host_session.dane = dns_lookup(function(answer)
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99 if answer and ((answer.secure and #answer > 0) or answer.bogus) then
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100 srv_choice.dane = answer;
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101 else
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102 srv_choice.dane = false;
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103 end
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104 host_session.dane = srv_choice.dane;
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105 if cb then return cb(a,b,c,e); end
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106 end, ("_%d._tcp.%s."):format(srv_choice.port, srv_choice.target), "TLSA");
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107 return true;
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108 end
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109 end
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110
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diff changeset
111 function module.add_host(module)
1394
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diff changeset
112 local function on_new_s2s(event)
1367
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diff changeset
113 local host_session = event.origin;
1394
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diff changeset
114 if host_session.type == "s2sout" or host_session.type == "s2sin" or host_session.dane ~= nil then return end -- Already authenticated
1367
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Kim Alvefur <zash@zash.se>
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diff changeset
115 local function resume()
1383
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parents: 1370
diff changeset
116 host_session.log("debug", "DANE lookup completed, resuming connection");
1367
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diff changeset
117 host_session.conn:resume()
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parents: 1362
diff changeset
118 end
1435
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diff changeset
119 if dane_lookup(host_session, resume) then
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diff changeset
120 host_session.log("debug", "Pausing connection until DANE lookup is completed");
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121 host_session.conn:pause()
1367
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122 end
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123 end
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124
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125 -- New outgoing connections
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126 module:hook("stanza/http://etherx.jabber.org/streams:features", on_new_s2s, 501);
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127 module:hook("s2sout-authenticate-legacy", on_new_s2s, 200);
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128
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129 -- New incoming connections
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130 module:hook("s2s-stream-features", on_new_s2s, 10);
1347
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131
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132 module:hook("s2s-authenticated", function(event)
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133 local session = event.session;
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134 if session.dane and not session.secure then
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135 -- TLSA record but no TLS, not ok.
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136 -- TODO Optional?
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137 -- Bogus replies should trigger this path
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138 -- How does this interact with Dialback?
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diff changeset
139 session:close({
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diff changeset
140 condition = "policy-violation",
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diff changeset
141 text = "Encrypted server-to-server communication is required but was not "
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142 ..((session.direction == "outgoing" and "offered") or "used")
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143 });
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diff changeset
144 return false;
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diff changeset
145 end
1392
d99c10fc4d19 mod_s2s_auth_dane: Clean up no longer needed DNS replies
Kim Alvefur <zash@zash.se>
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diff changeset
146 -- Cleanup
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diff changeset
147 session.dane = nil;
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148 session.srv_hosts = nil;
1347
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diff changeset
149 end);
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parents:
diff changeset
150 end
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parents:
diff changeset
151
1389
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diff changeset
152 local function one_dane_check(tlsa, cert)
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153 local select, match, certdata = tlsa.select, tlsa.match;
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154
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155 if select == 0 then
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diff changeset
156 certdata = pem2der(cert:pem());
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diff changeset
157 elseif select == 1 and cert.pubkey then
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158 certdata = pem2der(cert:pubkey());
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diff changeset
159 else
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diff changeset
160 module:log("warn", "DANE selector %s is unsupported", tlsa:getSelector() or select);
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161 return;
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162 end
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163
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diff changeset
164 if match == 1 then
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165 certdata = hashes.sha256(certdata);
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166 elseif match == 2 then
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167 certdata = hashes.sha512(certdata);
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168 elseif match ~= 0 then
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169 module:log("warn", "DANE match rule %s is unsupported", tlsa:getMatchType() or match);
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diff changeset
170 return;
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171 end
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diff changeset
172
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173 return certdata == tlsa.data;
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174 end
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175
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parents:
diff changeset
176 module:hook("s2s-check-certificate", function(event)
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
177 local session, cert = event.session, event.cert;
1434
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parents: 1431
diff changeset
178 if not cert then return end
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Kim Alvefur <zash@zash.se>
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diff changeset
179 local log = session.log or module._log;
1347
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diff changeset
180 local dane = session.dane;
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diff changeset
181 if type(dane) == "table" then
1396
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parents: 1395
diff changeset
182 local use, tlsa, match_found, supported_found, chain, leafcert, cacert, is_match;
1347
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Kim Alvefur <zash@zash.se>
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diff changeset
183 for i = 1, #dane do
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Kim Alvefur <zash@zash.se>
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diff changeset
184 tlsa = dane[i].tlsa;
1335
faf4bd226cad mod_s2s_auth_dane: Improve logging
Kim Alvefur <zash@zash.se>
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diff changeset
185 module:log("debug", "TLSA %s %s %s %d bytes of data", tlsa:getUsage(), tlsa:getSelector(), tlsa:getMatchType(), #tlsa.data);
1389
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diff changeset
186 use = tlsa.use;
1258
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parents:
diff changeset
187
1348
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Kim Alvefur <zash@zash.se>
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diff changeset
188 if enabled_uses:contains(use) then
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Kim Alvefur <zash@zash.se>
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diff changeset
189 -- PKIX-EE or DANE-EE
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Kim Alvefur <zash@zash.se>
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diff changeset
190 if use == 1 or use == 3 then
1389
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diff changeset
191 -- Should we check if the cert subject matches?
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diff changeset
192 is_match = one_dane_check(tlsa, cert);
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Kim Alvefur <zash@zash.se>
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diff changeset
193 if is_match ~= nil then
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Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
194 supported_found = true;
1348
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Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
195 end
1389
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diff changeset
196 if is_match then
1431
33a796b2cb91 mod_s2s_auth_dane: Cache logger to save some table lookups and improve readability
Kim Alvefur <zash@zash.se>
parents: 1415
diff changeset
197 log("info", "DANE validation successful");
1348
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Kim Alvefur <zash@zash.se>
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diff changeset
198 session.cert_identity_status = "valid";
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diff changeset
199 if use == 3 then -- DANE-EE, chain status equals DNSSEC chain status
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Kim Alvefur <zash@zash.se>
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diff changeset
200 session.cert_chain_status = "valid";
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diff changeset
201 -- for usage 1, PKIX-EE, the chain has to be valid already
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Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
202 end
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Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
203 match_found = true;
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Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
204 break;
1258
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parents:
diff changeset
205 end
1396
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Kim Alvefur <zash@zash.se>
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diff changeset
206 elseif use == 0 or use == 2 then
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Kim Alvefur <zash@zash.se>
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diff changeset
207 supported_found = true;
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Kim Alvefur <zash@zash.se>
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diff changeset
208 if chain == nil then
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Kim Alvefur <zash@zash.se>
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diff changeset
209 chain = session.conn:socket():getpeerchain();
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Kim Alvefur <zash@zash.se>
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diff changeset
210 end
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Kim Alvefur <zash@zash.se>
parents: 1395
diff changeset
211 for i = 2, #chain do
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Kim Alvefur <zash@zash.se>
parents: 1395
diff changeset
212 cacert, leafcert = chain[i], chain[i-1];
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Kim Alvefur <zash@zash.se>
parents: 1395
diff changeset
213 is_match = one_dane_check(tlsa, cacert);
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Kim Alvefur <zash@zash.se>
parents: 1395
diff changeset
214 if is_match ~= nil then
cf4e39334ef7 mod_s2s_auth_dane: Add support for DANE-TA and PKIX-CA (requires LuaSec changes)
Kim Alvefur <zash@zash.se>
parents: 1395
diff changeset
215 supported_found = true;
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parents: 1395
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216 end
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parents: 1395
diff changeset
217 if use == 2 and not cacert:issued(leafcert or cacert) then
cf4e39334ef7 mod_s2s_auth_dane: Add support for DANE-TA and PKIX-CA (requires LuaSec changes)
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parents: 1395
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218 module:log("debug", "Broken chain");
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parents: 1395
diff changeset
219 break;
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parents: 1395
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220 end
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Kim Alvefur <zash@zash.se>
parents: 1395
diff changeset
221 if is_match then
1431
33a796b2cb91 mod_s2s_auth_dane: Cache logger to save some table lookups and improve readability
Kim Alvefur <zash@zash.se>
parents: 1415
diff changeset
222 log("info", "DANE validation successful");
1396
cf4e39334ef7 mod_s2s_auth_dane: Add support for DANE-TA and PKIX-CA (requires LuaSec changes)
Kim Alvefur <zash@zash.se>
parents: 1395
diff changeset
223 if use == 2 then -- DANE-TA
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parents: 1395
diff changeset
224 session.cert_identity_status = "valid";
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parents: 1395
diff changeset
225 session.cert_chain_status = "valid";
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parents: 1395
diff changeset
226 -- for usage 0, PKIX-CA, identity and chain has to be valid already
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parents: 1395
diff changeset
227 end
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Kim Alvefur <zash@zash.se>
parents: 1395
diff changeset
228 match_found = true;
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parents: 1395
diff changeset
229 break;
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Kim Alvefur <zash@zash.se>
parents: 1395
diff changeset
230 end
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Kim Alvefur <zash@zash.se>
parents: 1395
diff changeset
231 end
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Kim Alvefur <zash@zash.se>
parents: 1395
diff changeset
232 if match_found then break end
1258
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
233 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
234 end
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
235 end
1347
52b419885f0a mod_s2s_auth_dane: Simplify, but diverge from DANE-SRV draft. Will now look for _xmpp-server.example.com IN TLSA for both directions
Kim Alvefur <zash@zash.se>
parents: 1344
diff changeset
236 if supported_found and not match_found or dane.bogus then
1332
08a0241f5d2c mod_s2s_auth_dane: Add some comments
Kim Alvefur <zash@zash.se>
parents: 1330
diff changeset
237 -- No TLSA matched or response was bogus
1431
33a796b2cb91 mod_s2s_auth_dane: Cache logger to save some table lookups and improve readability
Kim Alvefur <zash@zash.se>
parents: 1415
diff changeset
238 log("warn", "DANE validation failed");
1262
1e84eebf3f46 mod_s2s_auth_dane: Invalidate trust if there are TLSA records but no matches, or bogus results
Kim Alvefur <zash@zash.se>
parents: 1261
diff changeset
239 session.cert_identity_status = "invalid";
1e84eebf3f46 mod_s2s_auth_dane: Invalidate trust if there are TLSA records but no matches, or bogus results
Kim Alvefur <zash@zash.se>
parents: 1261
diff changeset
240 session.cert_chain_status = "invalid";
1e84eebf3f46 mod_s2s_auth_dane: Invalidate trust if there are TLSA records but no matches, or bogus results
Kim Alvefur <zash@zash.se>
parents: 1261
diff changeset
241 end
1370
e3fe6c749bc3 mod_s2s_auth_dane: Merge functionality from mod_s2s_auth_dnssec_srv
Kim Alvefur <zash@zash.se>
parents: 1368
diff changeset
242 else
e3fe6c749bc3 mod_s2s_auth_dane: Merge functionality from mod_s2s_auth_dnssec_srv
Kim Alvefur <zash@zash.se>
parents: 1368
diff changeset
243 if session.cert_chain_status == "valid" and session.cert_identity_status ~= "valid"
1411
8626abe100e2 mod_s2s_auth_dane: Fix traceback if session.srv_hosts is nil
Kim Alvefur <zash@zash.se>
parents: 1410
diff changeset
244 and session.srv_hosts and session.srv_hosts.answer and session.srv_hosts.answer.secure then
1370
e3fe6c749bc3 mod_s2s_auth_dane: Merge functionality from mod_s2s_auth_dnssec_srv
Kim Alvefur <zash@zash.se>
parents: 1368
diff changeset
245 local srv_hosts, srv_choice, srv_target = session.srv_hosts, session.srv_choice;
e3fe6c749bc3 mod_s2s_auth_dane: Merge functionality from mod_s2s_auth_dnssec_srv
Kim Alvefur <zash@zash.se>
parents: 1368
diff changeset
246 for i = srv_choice or 1, srv_choice or #srv_hosts do
1415
8791fa8a18c8 mod_s2s_auth_dane: Fix potential traceback in logging if SRV target fails nameprep
Kim Alvefur <zash@zash.se>
parents: 1414
diff changeset
247 srv_target = session.srv_hosts[i].target:gsub("%.?$","");
1431
33a796b2cb91 mod_s2s_auth_dane: Cache logger to save some table lookups and improve readability
Kim Alvefur <zash@zash.se>
parents: 1415
diff changeset
248 log("debug", "Comparing certificate with Secure SRV target %s", srv_target);
1415
8791fa8a18c8 mod_s2s_auth_dane: Fix potential traceback in logging if SRV target fails nameprep
Kim Alvefur <zash@zash.se>
parents: 1414
diff changeset
249 srv_target = nameprep(idna_to_unicode());
1370
e3fe6c749bc3 mod_s2s_auth_dane: Merge functionality from mod_s2s_auth_dnssec_srv
Kim Alvefur <zash@zash.se>
parents: 1368
diff changeset
250 if srv_target and cert_verify_identity(srv_target, "xmpp-server", cert) then
1431
33a796b2cb91 mod_s2s_auth_dane: Cache logger to save some table lookups and improve readability
Kim Alvefur <zash@zash.se>
parents: 1415
diff changeset
251 log("info", "Certificate matches Secure SRV target %s", srv_target);
1370
e3fe6c749bc3 mod_s2s_auth_dane: Merge functionality from mod_s2s_auth_dnssec_srv
Kim Alvefur <zash@zash.se>
parents: 1368
diff changeset
252 session.cert_identity_status = "valid";
e3fe6c749bc3 mod_s2s_auth_dane: Merge functionality from mod_s2s_auth_dnssec_srv
Kim Alvefur <zash@zash.se>
parents: 1368
diff changeset
253 return;
e3fe6c749bc3 mod_s2s_auth_dane: Merge functionality from mod_s2s_auth_dnssec_srv
Kim Alvefur <zash@zash.se>
parents: 1368
diff changeset
254 end
e3fe6c749bc3 mod_s2s_auth_dane: Merge functionality from mod_s2s_auth_dnssec_srv
Kim Alvefur <zash@zash.se>
parents: 1368
diff changeset
255 end
e3fe6c749bc3 mod_s2s_auth_dane: Merge functionality from mod_s2s_auth_dnssec_srv
Kim Alvefur <zash@zash.se>
parents: 1368
diff changeset
256 end
1258
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
257 end
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
258 end);
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
259