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annotate mod_s2s_auth_dane/mod_s2s_auth_dane.lua @ 1368:5724008bbdb1

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mod_s2s_auth_dane: Fix typo in debug statement
author Kim Alvefur <zash@zash.se>
date Thu, 20 Mar 2014 15:55:37 +0100
parents 103d685e2153
children e3fe6c749bc3
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 -- 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 -- 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
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28 if not dns_lookup.types or not dns_lookup.types.TLSA then
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29 module:log("error", "No TLSA support available, DANE will not be supported");
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30 return
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31 end
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32
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33 local s2sout = module:depends"s2s".route_to_new_session.s2sout;
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35 local pat = "%-%-%-%-%-BEGIN ([A-Z ]+)%-%-%-%-%-\r?\n"..
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36 "([0-9A-Za-z=+/\r\n]*)\r?\n%-%-%-%-%-END %1%-%-%-%-%-";
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37 local function pem2der(pem)
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38 local typ, data = pem:match(pat);
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39 if typ and data then
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40 return base64.decode(data), typ;
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41 end
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42 end
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43 local use_map = { ["DANE-EE"] = 3; ["DANE-TA"] = 2; ["PKIX-EE"] = 1; ["PKIX-CA"] = 0 }
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44
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45 local implemented_uses = set.new { "DANE-EE", "PKIX-EE" };
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46 local configured_uses = module:get_option_set("dane_uses", { "DANE-EE" });
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47 local enabled_uses = set.intersection(implemented_uses, configured_uses) / function(use) return use_map[use] end;
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48
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49 local function dane_lookup(host_session, cb, a,b,c,e)
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50 if host_session.dane ~= nil then return end
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51 if host_session.direction == "incoming" then
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52 local name = host_session.from_host and idna_to_ascii(host_session.from_host);
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53 if not name then return end
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54 host_session.dane = dns_lookup(function (answer)
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55 if not answer.secure then
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56 if cb then return cb(a,b,c,e); end
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57 return;
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58 end
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59 local n = #answer
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60 if n == 0 then if cb then return cb(a,b,c,e); end return end
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61 if n == 1 and answer[1].srv.target == '.' then return end
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62 local srv_hosts = { answer = answer };
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63 local dane = {};
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64 host_session.dane = dane;
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65 host_session.srv_hosts = srv_hosts;
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66 for _, record in ipairs(answer) do
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67 t_insert(srv_hosts, record.srv);
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68 dns_lookup(function(dane_answer)
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69 n = n - 1;
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70 if dane_answer.bogus then
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71 t_insert(dane, { bogus = dane_answer.bogus });
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72 elseif dane_answer.secure then
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73 for _, record in ipairs(dane_answer) do
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74 t_insert(dane, record);
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75 end
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76 end
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77 if n == 0 and cb then return cb(a,b,c,e); end
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78 end, ("_%d._tcp.%s."):format(record.srv.port, record.srv.target), "TLSA");
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79 end
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80 end, "_xmpp-server._tcp."..name..".", "SRV");
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81 return true;
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82 elseif host_session.direction == "outgoing" then
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83 local srv_hosts = host_session.srv_hosts;
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84 if not ( srv_hosts and srv_hosts.answer and srv_hosts.answer.secure ) then return end
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85 local srv_choice = srv_hosts[host_session.srv_choice];
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86 host_session.dane = dns_lookup(function(answer)
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87 if answer and (answer.secure and #answer > 0) or answer.bogus then
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88 srv_choice.dane = answer;
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89 else
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90 srv_choice.dane = false;
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91 end
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92 host_session.dane = srv_choice.dane;
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93 if cb then return cb(a,b,c,e); end
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94 end, ("_%d._tcp.%s."):format(srv_choice.port, srv_choice.target), "TLSA");
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95 return true;
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96 end
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97 end
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98
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99 local _try_connect = s2sout.try_connect;
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100 function s2sout.try_connect(host_session, connect_host, connect_port, err)
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101 if not err and dane_lookup(host_session, _try_connect, host_session, connect_host, connect_port, err) then
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102 return true;
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103 end
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104 return _try_connect(host_session, connect_host, connect_port, err);
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105 end
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106
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107 function module.add_host(module)
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108 module:hook("s2s-stream-features", function(event)
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109 -- dane_lookup(origin, origin.from_host);
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110 local host_session = event.origin;
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diff changeset
111 host_session.log("debug", "Pausing connection until DANE lookup is completed");
103d685e2153 mod_s2s_auth_dane: Pause s2sin while doing SRV and TLSA lookups, fixes race condition (Can haz util.async plz)
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diff changeset
112 host_session.conn:pause()
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parents: 1362
diff changeset
113 local function resume()
1368
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diff changeset
114 module:log("debug", "Resuming connection");
1367
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diff changeset
115 host_session.conn:resume()
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diff changeset
116 end
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diff changeset
117 if not dane_lookup(host_session, resume) then
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118 resume();
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119 end
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diff changeset
120 end, 10);
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121
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122 module:hook("s2s-authenticated", function(event)
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123 local session = event.session;
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124 if session.dane and not session.secure then
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diff changeset
125 -- TLSA record but no TLS, not ok.
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126 -- TODO Optional?
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127 -- Bogus replies should trigger this path
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diff changeset
128 -- How does this interact with Dialback?
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diff changeset
129 session:close({
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130 condition = "policy-violation",
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131 text = "Encrypted server-to-server communication is required but was not "
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132 ..((session.direction == "outgoing" and "offered") or "used")
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diff changeset
133 });
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Kim Alvefur <zash@zash.se>
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diff changeset
134 return false;
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135 end
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diff changeset
136 end);
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parents:
diff changeset
137 end
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parents:
diff changeset
138
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
139 module:hook("s2s-check-certificate", function(event)
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parents:
diff changeset
140 local session, cert = event.session, event.cert;
1347
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Kim Alvefur <zash@zash.se>
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diff changeset
141 local dane = session.dane;
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Kim Alvefur <zash@zash.se>
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diff changeset
142 if type(dane) == "table" then
1344
47d3c1c8a176 mod_s2s_auth_dane: Only invalidate trust if we found any supported DANE records
Kim Alvefur <zash@zash.se>
parents: 1339
diff changeset
143 local use, select, match, tlsa, certdata, match_found, supported_found;
1347
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Kim Alvefur <zash@zash.se>
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diff changeset
144 for i = 1, #dane do
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Kim Alvefur <zash@zash.se>
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diff changeset
145 tlsa = dane[i].tlsa;
1335
faf4bd226cad mod_s2s_auth_dane: Improve logging
Kim Alvefur <zash@zash.se>
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diff changeset
146 module:log("debug", "TLSA %s %s %s %d bytes of data", tlsa:getUsage(), tlsa:getSelector(), tlsa:getMatchType(), #tlsa.data);
1258
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parents:
diff changeset
147 use, select, match, certdata = tlsa.use, tlsa.select, tlsa.match;
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parents:
diff changeset
148
1348
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diff changeset
149 if enabled_uses:contains(use) then
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diff changeset
150 -- PKIX-EE or DANE-EE
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Kim Alvefur <zash@zash.se>
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diff changeset
151 if use == 1 or use == 3 then
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Kim Alvefur <zash@zash.se>
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diff changeset
152 supported_found = true
1258
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diff changeset
153
1348
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diff changeset
154 if select == 0 then
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Kim Alvefur <zash@zash.se>
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diff changeset
155 certdata = pem2der(cert:pem());
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diff changeset
156 elseif select == 1 and cert.pubkey then
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diff changeset
157 certdata = pem2der(cert:pubkey()); -- Not supported in stock LuaSec
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diff changeset
158 else
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Kim Alvefur <zash@zash.se>
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diff changeset
159 module:log("warn", "DANE selector %s is unsupported", tlsa:getSelector() or select);
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Kim Alvefur <zash@zash.se>
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diff changeset
160 end
1327
b93f45c42044 mod_s2s_auth_dane: Comment updates
Kim Alvefur <zash@zash.se>
parents: 1325
diff changeset
161
1348
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diff changeset
162 if match == 1 then
1352
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Kim Alvefur <zash@zash.se>
parents: 1351
diff changeset
163 certdata = certdata and hashes.sha256(certdata);
1348
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Kim Alvefur <zash@zash.se>
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diff changeset
164 elseif match == 2 then
1352
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Kim Alvefur <zash@zash.se>
parents: 1351
diff changeset
165 certdata = certdata and hashes.sha512(certdata);
1348
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Kim Alvefur <zash@zash.se>
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diff changeset
166 elseif match ~= 0 then
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Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
167 module:log("warn", "DANE match rule %s is unsupported", tlsa:getMatchType() or match);
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Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
168 certdata = nil;
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diff changeset
169 end
1258
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parents:
diff changeset
170
1348
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diff changeset
171 -- Should we check if the cert subject matches?
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Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
172 if certdata and certdata == tlsa.data then
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Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
173 (session.log or module._log)("info", "DANE validation successful");
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Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
174 session.cert_identity_status = "valid";
6191613959dc mod_s2s_auth_dane: Make supported DANE usages configurable, default to DANE-EE
Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
175 if use == 3 then -- DANE-EE, chain status equals DNSSEC chain status
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Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
176 session.cert_chain_status = "valid";
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Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
177 -- for usage 1, PKIX-EE, the chain has to be valid already
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Kim Alvefur <zash@zash.se>
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diff changeset
178 end
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Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
179 match_found = true;
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Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
180 break;
1258
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parents:
diff changeset
181 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
182 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
183 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
184 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
185 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
186 -- No TLSA matched or response was bogus
1265
020165014e56 mod_s2s_auth_dane: Fix wording on validation failure
Kim Alvefur <zash@zash.se>
parents: 1262
diff changeset
187 (session.log or module._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
188 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
189 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
190 end
1258
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
191 end
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
192 end);
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
193
1347
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Kim Alvefur <zash@zash.se>
parents: 1344
diff changeset
194 function module.unload()
1351
a052740bbf48 mod_s2s_auth_dane: Back to _port._tcp.srvtarget.example.net
Kim Alvefur <zash@zash.se>
parents: 1350
diff changeset
195 -- Restore the original try_connect function
a052740bbf48 mod_s2s_auth_dane: Back to _port._tcp.srvtarget.example.net
Kim Alvefur <zash@zash.se>
parents: 1350
diff changeset
196 s2sout.try_connect = _try_connect;
1330
bb6f3312ab46 mod_s2s_auth_dane: Don't allow unencrypted connections if TLSA exists
Kim Alvefur <zash@zash.se>
parents: 1329
diff changeset
197 end
bb6f3312ab46 mod_s2s_auth_dane: Don't allow unencrypted connections if TLSA exists
Kim Alvefur <zash@zash.se>
parents: 1329
diff changeset
198