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annotate mod_s2s_auth_dane/mod_s2s_auth_dane.lua @ 1339:50555c2ccbcd

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mod_s2s_auth_dane: Improve handling of bogus data
author Kim Alvefur <zash@zash.se>
date Sun, 09 Mar 2014 23:17:17 +0100
parents eca8c480891e
children 47d3c1c8a176
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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 -- Could be done much cleaner if mod_s2s was using util.async
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7
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8
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9 module:set_global();
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10
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11 local dns_lookup = require"net.adns".lookup;
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12 local hashes = require"util.hashes";
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13 local base64 = require"util.encodings".base64;
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14
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15 local s2sout = module:depends"s2s".route_to_new_session.s2sout;
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16
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17 local bogus = {};
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18
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19 local pat = "%-%-%-%-%-BEGIN ([A-Z ]+)%-%-%-%-%-\r?\n"..
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20 "([0-9A-Za-z=+/\r\n]*)\r?\n%-%-%-%-%-END %1%-%-%-%-%-";
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21 local function pem2der(pem)
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22 local typ, data = pem:match(pat);
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23 if typ and data then
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24 return base64.decode(data), typ;
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25 end
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26 end
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27
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28 -- TODO Things to test/handle:
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29 -- Negative or bogus answers
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30 -- No SRV records
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31 -- No encryption offered
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32 -- Different hostname before and after STARTTLS - mod_s2s should complain
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33
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34 -- This function is called when a new SRV target has been picked
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35 -- the original function does A/AAAA resolution before continuing
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36 local _try_connect = s2sout.try_connect;
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37 function s2sout.try_connect(host_session, connect_host, connect_port, err)
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38 local srv_hosts = host_session.srv_hosts;
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39 local srv_choice = host_session.srv_choice;
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40 if srv_hosts and srv_hosts.answer.secure and srv_hosts[srv_choice].dane == nil then
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41 srv_hosts[srv_choice].dane = dns_lookup(function(answer)
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42 if answer and #answer > 0 and answer.secure then
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43 srv_hosts[srv_choice].dane = answer;
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44 elseif answer.bogus then
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45 srv_hosts[srv_choice].dane = bogus;
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46 else
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47 srv_hosts[srv_choice].dane = false;
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48 end
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49 -- "blocking" until TLSA reply, but no race condition
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50 return _try_connect(host_session, connect_host, connect_port, err);
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51 end, ("_%d._tcp.%s"):format(connect_port, connect_host), "TLSA");
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52 return true
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53 end
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54 return _try_connect(host_session, connect_host, connect_port, err);
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55 end
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56
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57 module:hook("s2s-check-certificate", function(event)
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58 local session, cert = event.session, event.cert;
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59 local srv_hosts = session.srv_hosts;
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60 local srv_choice = session.srv_choice;
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61 local choosen = srv_hosts and srv_hosts[srv_choice] or session;
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62 if choosen.dane then
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63 local use, select, match, tlsa, certdata, match_found;
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64 for i, rr in ipairs(choosen.dane) do
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65 tlsa = rr.tlsa;
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66 module:log("debug", "TLSA %s %s %s %d bytes of data", tlsa:getUsage(), tlsa:getSelector(), tlsa:getMatchType(), #tlsa.data);
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67 use, select, match, certdata = tlsa.use, tlsa.select, tlsa.match;
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68
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69 -- PKIX-EE or DANE-EE
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70 if use == 1 or use == 3 then
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71
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72 if select == 0 then
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73 certdata = pem2der(cert:pem());
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74 elseif select == 1 and cert.pubkey then
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75 certdata = pem2der(cert:pubkey()); -- Not supported in stock LuaSec
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76 else
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77 module:log("warn", "DANE selector %s is unsupported", tlsa:getSelector() or select);
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78 end
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79
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80 if match == 1 then
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81 certdata = hashes.sha256(certdata);
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82 elseif match == 2 then
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83 certdata = hashes.sha512(certdata);
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84 elseif match ~= 0 then
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85 module:log("warn", "DANE match rule %s is unsupported", tlsa:getMatchType() or match);
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86 certdata = nil;
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87 end
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88
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89 -- Should we check if the cert subject matches?
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90 if certdata and certdata == tlsa.data then
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91 (session.log or module._log)("info", "DANE validation successful");
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92 session.cert_identity_status = "valid";
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93 if use == 3 then -- DANE-EE, chain status equals DNSSEC chain status
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94 session.cert_chain_status = "valid";
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95 -- for usage 1, PKIX-EE, the chain has to be valid already
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96 end
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97 match_found = true;
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98 break;
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99 end
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100 else
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101 module:log("warn", "DANE usage %s is unsupported", tlsa:getUsage() or use);
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102 -- PKIX-TA checks needs to loop over the chain and stuff
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103 -- LuaSec does not expose anything for validating a random chain, so DANE-TA is not possible atm
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104 end
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105 end
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106 if not match_found then
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107 -- No TLSA matched or response was bogus
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108 (session.log or module._log)("warn", "DANE validation failed");
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109 session.cert_identity_status = "invalid";
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110 session.cert_chain_status = "invalid";
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111 end
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112 end
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113 end);
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114
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115 function module.add_host(module)
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116 module:hook("s2s-authenticated", function(event)
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117 local session = event.session;
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118 local srv_hosts = session.srv_hosts;
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119 local srv_choice = session.srv_choice;
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120 if (session.dane or srv_hosts and srv_hosts[srv_choice].dane) and not session.secure then
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121 -- TLSA record but no TLS, not ok.
1332
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122 -- TODO Optional?
1334
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123 -- Bogus replies will trigger this path
1330
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124 session:close({
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125 condition = "policy-violation",
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126 text = "Encrypted server-to-server communication is required but was not "
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127 ..((session.direction == "outgoing" and "offered") or "used")
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128 });
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129 return false;
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130 end
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131 end);
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132
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133 -- DANE for s2sin
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134 -- Looks for TLSA at the same QNAME as the SRV record
1338
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parents: 1337
diff changeset
135 -- FIXME This has a race condition
1336
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Kim Alvefur <zash@zash.se>
parents: 1335
diff changeset
136 module:hook("s2s-stream-features", function(event)
1333
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parents: 1332
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137 local origin = event.origin;
1337
c38f163f18b9 mod_s2s_auth_dane: Fix inverted nil check
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parents: 1336
diff changeset
138 if not origin.from_host or origin.dane ~= nil then return end
1333
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parents: 1332
diff changeset
139
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parents: 1332
diff changeset
140 origin.dane = dns_lookup(function(answer)
1339
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Kim Alvefur <zash@zash.se>
parents: 1338
diff changeset
141 if answer and #answer > 0 and answer.secure then
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142 srv_hosts[srv_choice].dane = answer;
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Kim Alvefur <zash@zash.se>
parents: 1338
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143 elseif answer.bogus then
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diff changeset
144 srv_hosts[srv_choice].dane = bogus;
1333
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parents: 1332
diff changeset
145 else
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parents: 1332
diff changeset
146 origin.dane = false;
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parents: 1332
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147 end
1338
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parents: 1337
diff changeset
148 end, ("_xmpp-server._tcp.%s."):format(origin.from_host), "TLSA");
1333
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parents: 1332
diff changeset
149 end, 1);
1330
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parents: 1329
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150 end
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parents: 1329
diff changeset
151
1258
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
152 function module.unload()
1332
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Kim Alvefur <zash@zash.se>
parents: 1330
diff changeset
153 -- Restore the original try_connect function
1258
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
154 s2sout.try_connect = _try_connect;
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Kim Alvefur <zash@zash.se>
parents:
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155 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
156