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annotate mod_s2s_auth_dane/mod_s2s_auth_dane.lua @ 1626:aed20f9e78c8

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mod_s2s_auth_dane: Comments and cleanup
author Kim Alvefur <zash@zash.se>
date Mon, 16 Mar 2015 16:19:53 +0100
parents 6ea13869753f
children a4a6b4be973a
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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 noop = function () end
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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 local idna_to_unicode = require"util.encodings".idna.to_unicode;
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29 local nameprep = require"util.encodings".stringprep.nameprep;
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30 local cert_verify_identity = require "util.x509".verify_identity;
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31
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32 do
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33 local net_dns = require"net.dns";
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34 if not net_dns.types or not net_dns.types[52] then
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35 module:log("error", "No TLSA support available, DANE will not be supported");
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36 return
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37 end
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38 end
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39
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40 local pat = "%-%-%-%-%-BEGIN ([A-Z ]+)%-%-%-%-%-\r?\n"..
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41 "([0-9A-Za-z=+/\r\n]*)\r?\n%-%-%-%-%-END %1%-%-%-%-%-";
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42 local function pem2der(pem)
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43 local typ, data = pem:match(pat);
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44 if typ and data then
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45 return base64.decode(data), typ;
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46 end
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47 end
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48 local use_map = { ["DANE-EE"] = 3; ["DANE-TA"] = 2; ["PKIX-EE"] = 1; ["PKIX-CA"] = 0 }
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49
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50 local implemented_uses = set.new { "DANE-EE", "PKIX-EE" };
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51 do
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52 local cert_mt = debug.getregistry()["SSL:Certificate"];
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53 if cert_mt and cert_mt.__index.issued then
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54 -- Need cert:issued() for these
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55 implemented_uses:add("DANE-TA");
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56 implemented_uses:add("PKIX-CA");
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57 else
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58 module:log("warn", "Unable to support DANE-TA and PKIX-CA");
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59 end
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60 end
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61 local configured_uses = module:get_option_set("dane_uses", { "DANE-EE", "DANE-TA" });
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62 local enabled_uses = set.intersection(implemented_uses, configured_uses) / function(use) return use_map[use] end;
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63
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64 -- Find applicable TLSA records
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65 -- Takes a s2sin/out and a callback
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66 local function dane_lookup(host_session, cb)
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67 cb = cb or noop;
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68 if host_session.dane ~= nil then return end -- Has already done a lookup
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69
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70 if host_session.direction == "incoming" then
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71 -- We don't know what hostname or port to use for Incoming connections
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72 -- so we do a SRV lookup and then request TLSA records for each SRV
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73 -- Most servers will probably use the same certificate on outgoing
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74 -- and incoming connections, so this should work well
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75 local name = host_session.from_host and idna_to_ascii(host_session.from_host);
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76 if not name then
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77 module:log("error", "Could not convert '%s' to ASCII for DNS lookup", tostring(host_session.from_host));
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78 return;
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79 end
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80 host_session.dane = dns_lookup(function (answer, err)
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81 host_session.dane = false; -- Mark that we already did the lookup
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82
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83 if not answer then
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84 module:log("debug", "Resolver error: %s", tostring(err));
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85 return cb(host_session);
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86 end
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87
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88 if not answer.secure then
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89 module:log("debug", "Results are not secure");
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90 return cb(host_session);
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91 end
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92
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93 local n = #answer
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94 if n == 0 then
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95 -- No SRV records, we could proceed with the domainname and
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96 -- default port but that will currently not work properly since
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97 -- mod_s2s doesn't keep the answer around for that
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98 return cb(host_session);
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99 end
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100 if n == 1 and answer[1].srv.target == '.' then
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101 return cb(host_session); -- No service ... This shouldn't happen?
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102 end
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103 local srv_hosts = { answer = answer };
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104 local dane = {};
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105 host_session.dane = dane;
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106 host_session.srv_hosts = srv_hosts;
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107 for _, record in ipairs(answer) do
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108 t_insert(srv_hosts, record.srv);
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109 dns_lookup(function(dane_answer)
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110 n = n - 1;
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111 if dane_answer.bogus then
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112 dane.bogus = dane_answer.bogus;
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113 elseif dane_answer.secure then
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114 for _, record in ipairs(dane_answer) do
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115 t_insert(dane, record);
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116 end
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117 end
1626
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parents: 1507
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118 if n == 0 then
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parents: 1507
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119 if #dane > 0 and dane.bogus then
aed20f9e78c8 mod_s2s_auth_dane: Comments and cleanup
Kim Alvefur <zash@zash.se>
parents: 1507
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120 -- Got at least one non-bogus reply,
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121 -- This should trigger a failure if one of them did not match
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122 host_session.log("warn", "Ignoring bogus replies");
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parents: 1507
diff changeset
123 dane.bogus = nil;
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parents: 1507
diff changeset
124 end
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parents: 1507
diff changeset
125 if #dane == 0 and dane.bogus == nil then
aed20f9e78c8 mod_s2s_auth_dane: Comments and cleanup
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parents: 1507
diff changeset
126 -- Got no usable data
aed20f9e78c8 mod_s2s_auth_dane: Comments and cleanup
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parents: 1507
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127 host_session.dane = false;
aed20f9e78c8 mod_s2s_auth_dane: Comments and cleanup
Kim Alvefur <zash@zash.se>
parents: 1507
diff changeset
128 end
aed20f9e78c8 mod_s2s_auth_dane: Comments and cleanup
Kim Alvefur <zash@zash.se>
parents: 1507
diff changeset
129 return cb(host_session);
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parents: 1507
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130 end
1351
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parents: 1350
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131 end, ("_%d._tcp.%s."):format(record.srv.port, record.srv.target), "TLSA");
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132 end
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133 end, "_xmpp-server._tcp."..name..".", "SRV");
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diff changeset
134 return true;
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diff changeset
135 elseif host_session.direction == "outgoing" then
1626
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136 -- Prosody has already done SRV lookups for outgoing session, so check if those are secure
1359
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137 local srv_hosts = host_session.srv_hosts;
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138 if not ( srv_hosts and srv_hosts.answer and srv_hosts.answer.secure ) then
aed20f9e78c8 mod_s2s_auth_dane: Comments and cleanup
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parents: 1507
diff changeset
139 return; -- No secure SRV records, fall back to non-DANE mode
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140 end
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141 -- Do TLSA lookup for currently selected SRV record
1359
74769c0c79f8 mod_s2s_auth_dane: Verify that the SRV is secure
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142 local srv_choice = srv_hosts[host_session.srv_choice];
1351
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diff changeset
143 host_session.dane = dns_lookup(function(answer)
1409
151aa00559d1 mod_s2s_auth_dane: Fix logic precedence issue
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diff changeset
144 if answer and ((answer.secure and #answer > 0) or answer.bogus) then
1351
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diff changeset
145 srv_choice.dane = answer;
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diff changeset
146 else
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diff changeset
147 srv_choice.dane = false;
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diff changeset
148 end
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Kim Alvefur <zash@zash.se>
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diff changeset
149 host_session.dane = srv_choice.dane;
1626
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diff changeset
150 return cb(host_session);
1351
a052740bbf48 mod_s2s_auth_dane: Back to _port._tcp.srvtarget.example.net
Kim Alvefur <zash@zash.se>
parents: 1350
diff changeset
151 end, ("_%d._tcp.%s."):format(srv_choice.port, srv_choice.target), "TLSA");
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152 return true;
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Kim Alvefur <zash@zash.se>
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diff changeset
153 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
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154 end
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parents: 1344
diff changeset
155
1626
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diff changeset
156 local function resume(host_session)
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Kim Alvefur <zash@zash.se>
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157 host_session.log("debug", "DANE lookup completed, resuming connection");
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158 host_session.conn:resume()
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159 end
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160
1347
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161 function module.add_host(module)
1394
50f986deb3f7 mod_s2s_auth_dane: Launch DANE queries when sending or receiving stream-features instead of monkeypatching s2sout.lib
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diff changeset
162 local function on_new_s2s(event)
1367
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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163 local host_session = event.origin;
1626
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diff changeset
164 if host_session.type == "s2sout" or host_session.type == "s2sin" then
aed20f9e78c8 mod_s2s_auth_dane: Comments and cleanup
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165 return; -- Already authenticated
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Kim Alvefur <zash@zash.se>
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166 end
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parents: 1507
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167 if host_session.dane ~= nil then
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parents: 1507
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168 return; -- Already done DANE lookup
1367
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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parents: 1362
diff changeset
169 end
1435
cdc8f226a284 mod_s2s_auth_dane: Pause connection only if needed
Kim Alvefur <zash@zash.se>
parents: 1434
diff changeset
170 if dane_lookup(host_session, resume) then
cdc8f226a284 mod_s2s_auth_dane: Pause connection only if needed
Kim Alvefur <zash@zash.se>
parents: 1434
diff changeset
171 host_session.log("debug", "Pausing connection until DANE lookup is completed");
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Kim Alvefur <zash@zash.se>
parents: 1434
diff changeset
172 host_session.conn:pause()
1367
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Kim Alvefur <zash@zash.se>
parents: 1362
diff changeset
173 end
1394
50f986deb3f7 mod_s2s_auth_dane: Launch DANE queries when sending or receiving stream-features instead of monkeypatching s2sout.lib
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174 end
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parents: 1392
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175
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Kim Alvefur <zash@zash.se>
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176 -- New outgoing connections
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Kim Alvefur <zash@zash.se>
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177 module:hook("stanza/http://etherx.jabber.org/streams:features", on_new_s2s, 501);
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178 module:hook("s2sout-authenticate-legacy", on_new_s2s, 200);
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179
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Kim Alvefur <zash@zash.se>
parents: 1392
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180 -- New incoming connections
50f986deb3f7 mod_s2s_auth_dane: Launch DANE queries when sending or receiving stream-features instead of monkeypatching s2sout.lib
Kim Alvefur <zash@zash.se>
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181 module:hook("s2s-stream-features", on_new_s2s, 10);
1347
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182
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Kim Alvefur <zash@zash.se>
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diff changeset
183 module:hook("s2s-authenticated", function(event)
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>
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diff changeset
184 local session = event.session;
1626
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185 if session.dane and next(session.dane) ~= nil and not session.secure then
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>
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diff changeset
186 -- TLSA record but no TLS, not ok.
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>
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diff changeset
187 -- TODO Optional?
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Kim Alvefur <zash@zash.se>
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diff changeset
188 -- Bogus replies should trigger this path
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Kim Alvefur <zash@zash.se>
parents: 1344
diff changeset
189 -- How does this interact with Dialback?
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
190 session:close({
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
191 condition = "policy-violation",
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>
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diff changeset
192 text = "Encrypted server-to-server communication is required but was not "
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
193 ..((session.direction == "outgoing" and "offered") or "used")
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
194 });
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Kim Alvefur <zash@zash.se>
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diff changeset
195 return false;
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Kim Alvefur <zash@zash.se>
parents: 1344
diff changeset
196 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
197 -- Cleanup
d99c10fc4d19 mod_s2s_auth_dane: Clean up no longer needed DNS replies
Kim Alvefur <zash@zash.se>
parents: 1391
diff changeset
198 session.dane = nil;
d99c10fc4d19 mod_s2s_auth_dane: Clean up no longer needed DNS replies
Kim Alvefur <zash@zash.se>
parents: 1391
diff changeset
199 session.srv_hosts = nil;
1347
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Kim Alvefur <zash@zash.se>
parents: 1344
diff changeset
200 end);
1258
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
201 end
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
202
1626
aed20f9e78c8 mod_s2s_auth_dane: Comments and cleanup
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diff changeset
203 -- Compare one TLSA record against a certificate
1389
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
204 local function one_dane_check(tlsa, cert)
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Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
205 local select, match, certdata = tlsa.select, tlsa.match;
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diff changeset
206
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
207 if select == 0 then
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
208 certdata = pem2der(cert:pem());
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Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
209 elseif select == 1 and cert.pubkey then
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
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parents: 1383
diff changeset
210 certdata = pem2der(cert:pubkey());
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Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
211 else
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Kim Alvefur <zash@zash.se>
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diff changeset
212 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
213 return;
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Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
214 end
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Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
215
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
216 if match == 1 then
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
217 certdata = hashes.sha256(certdata);
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Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
218 elseif match == 2 then
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Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
219 certdata = hashes.sha512(certdata);
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
220 elseif match ~= 0 then
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
221 module:log("warn", "DANE match rule %s is unsupported", tlsa:getMatchType() or match);
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
222 return;
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
223 end
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
224
1626
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Kim Alvefur <zash@zash.se>
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diff changeset
225 if #certdata ~= #tlsa.data then
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Kim Alvefur <zash@zash.se>
parents: 1507
diff changeset
226 module:log("warn", "Length mismatch: Cert: %d, TLSA: %d", #certdata, #tlsa.data);
aed20f9e78c8 mod_s2s_auth_dane: Comments and cleanup
Kim Alvefur <zash@zash.se>
parents: 1507
diff changeset
227 end
1389
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
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diff changeset
228 return certdata == tlsa.data;
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Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
229 end
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
230
1258
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
231 module:hook("s2s-check-certificate", function(event)
1437
161bbe0b9dd3 mod_s2s_auth_dane: Tweak log messages
Kim Alvefur <zash@zash.se>
parents: 1436
diff changeset
232 local session, cert, host = event.session, event.cert, event.host;
1434
1caf971a2f0f mod_s2s_auth_dane: Return if no certificate found
Kim Alvefur <zash@zash.se>
parents: 1431
diff changeset
233 if not cert then return end
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
234 local log = session.log or module._log;
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
235 local dane = session.dane;
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 type(dane) == "table" then
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
237 local use, tlsa, match_found, supported_found, chain, leafcert, cacert, is_match;
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
238 for i = 1, #dane do
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
239 tlsa = dane[i].tlsa;
1437
161bbe0b9dd3 mod_s2s_auth_dane: Tweak log messages
Kim Alvefur <zash@zash.se>
parents: 1436
diff changeset
240 module:log("debug", "TLSA #%d: %s", i, tostring(tlsa))
1389
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
241 use = tlsa.use;
1258
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
242
1348
6191613959dc mod_s2s_auth_dane: Make supported DANE usages configurable, default to DANE-EE
Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
243 if enabled_uses:contains(use) then
6191613959dc mod_s2s_auth_dane: Make supported DANE usages configurable, default to DANE-EE
Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
244 -- PKIX-EE or DANE-EE
6191613959dc mod_s2s_auth_dane: Make supported DANE usages configurable, default to DANE-EE
Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
245 if use == 1 or use == 3 then
1389
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
246 -- Should we check if the cert subject matches?
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
247 is_match = one_dane_check(tlsa, cert);
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
248 if is_match ~= nil then
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
249 supported_found = true;
1348
6191613959dc mod_s2s_auth_dane: Make supported DANE usages configurable, default to DANE-EE
Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
250 end
1389
6bd9681d54b7 mod_s2s_auth_dane: Break out DANE check into a function
Kim Alvefur <zash@zash.se>
parents: 1383
diff changeset
251 if is_match then
1437
161bbe0b9dd3 mod_s2s_auth_dane: Tweak log messages
Kim Alvefur <zash@zash.se>
parents: 1436
diff changeset
252 log("info", "DANE validated ok for %s using %s", host, tlsa:getUsage());
1348
6191613959dc mod_s2s_auth_dane: Make supported DANE usages configurable, default to DANE-EE
Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
253 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
254 if use == 3 then -- DANE-EE, chain status equals DNSSEC chain status
6191613959dc mod_s2s_auth_dane: Make supported DANE usages configurable, default to DANE-EE
Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
255 session.cert_chain_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
256 -- for usage 1, PKIX-EE, the chain has to be valid already
6191613959dc mod_s2s_auth_dane: Make supported DANE usages configurable, default to DANE-EE
Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
257 end
6191613959dc mod_s2s_auth_dane: Make supported DANE usages configurable, default to DANE-EE
Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
258 match_found = true;
6191613959dc mod_s2s_auth_dane: Make supported DANE usages configurable, default to DANE-EE
Kim Alvefur <zash@zash.se>
parents: 1347
diff changeset
259 break;
1258
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
260 end
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
261 elseif use == 0 or use == 2 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
262 supported_found = true;
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
263 if chain == 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
264 chain = session.conn:socket():getpeerchain();
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
265 end
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
266 for i = 2, #chain do
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
267 cacert, leafcert = chain[i], chain[i-1];
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
268 is_match = one_dane_check(tlsa, cacert);
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
269 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
270 supported_found = true;
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
271 end
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
272 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)
Kim Alvefur <zash@zash.se>
parents: 1395
diff changeset
273 module:log("debug", "Broken chain");
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
274 break;
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
275 end
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
276 if is_match then
1437
161bbe0b9dd3 mod_s2s_auth_dane: Tweak log messages
Kim Alvefur <zash@zash.se>
parents: 1436
diff changeset
277 log("info", "DANE validated ok for %s using %s", host, tlsa:getUsage());
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
278 if use == 2 then -- DANE-TA
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
279 session.cert_identity_status = "valid";
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
280 session.cert_chain_status = "valid";
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
281 -- for usage 0, PKIX-CA, identity and chain has to be valid already
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
282 end
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
283 match_found = true;
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
284 break;
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
285 end
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
286 end
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
287 if match_found then break end
1258
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
288 end
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
289 end
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
290 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
291 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
292 -- No TLSA matched or response was bogus
1436
3944e364ba88 mod_s2s_auth_dane: Add some more info to log messages
Kim Alvefur <zash@zash.se>
parents: 1435
diff changeset
293 local why = "No TLSA matched certificate";
3944e364ba88 mod_s2s_auth_dane: Add some more info to log messages
Kim Alvefur <zash@zash.se>
parents: 1435
diff changeset
294 if dane.bogus then
3944e364ba88 mod_s2s_auth_dane: Add some more info to log messages
Kim Alvefur <zash@zash.se>
parents: 1435
diff changeset
295 why = "Bogus: "..tostring(dane.bogus);
3944e364ba88 mod_s2s_auth_dane: Add some more info to log messages
Kim Alvefur <zash@zash.se>
parents: 1435
diff changeset
296 end
1507
6ea13869753f mod_s2s_auth_dane: Include hostname when logging a failure
Kim Alvefur <zash@zash.se>
parents: 1506
diff changeset
297 log("warn", "DANE validation failed for %s: %s", host, why);
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
298 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
299 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
300 end
1370
e3fe6c749bc3 mod_s2s_auth_dane: Merge functionality from mod_s2s_auth_dnssec_srv
Kim Alvefur <zash@zash.se>
parents: 1368
diff changeset
301 else
e3fe6c749bc3 mod_s2s_auth_dane: Merge functionality from mod_s2s_auth_dnssec_srv
Kim Alvefur <zash@zash.se>
parents: 1368
diff changeset
302 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
303 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
304 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
305 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
306 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
307 log("debug", "Comparing certificate with Secure SRV target %s", srv_target);
1506
a40f9b8661d8 mod_s2s_auth_dane: Fix stringprepping when doing "DANE Light"
Kim Alvefur <zash@zash.se>
parents: 1502
diff changeset
308 srv_target = nameprep(idna_to_unicode(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
309 if srv_target and cert_verify_identity(srv_target, "xmpp-server", cert) then
1437
161bbe0b9dd3 mod_s2s_auth_dane: Tweak log messages
Kim Alvefur <zash@zash.se>
parents: 1436
diff changeset
310 log("info", "Certificate for %s matches Secure SRV target %s", host, 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
311 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
312 return;
e3fe6c749bc3 mod_s2s_auth_dane: Merge functionality from mod_s2s_auth_dnssec_srv
Kim Alvefur <zash@zash.se>
parents: 1368
diff changeset
313 end
e3fe6c749bc3 mod_s2s_auth_dane: Merge functionality from mod_s2s_auth_dnssec_srv
Kim Alvefur <zash@zash.se>
parents: 1368
diff changeset
314 end
e3fe6c749bc3 mod_s2s_auth_dane: Merge functionality from mod_s2s_auth_dnssec_srv
Kim Alvefur <zash@zash.se>
parents: 1368
diff changeset
315 end
1258
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
316 end
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
317 end);
fc82d8eded7d mod_s2s_auth_dane: Experimental DANE implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
318