Mercurial > prosody-modules
annotate mod_s2s_auth_dane/mod_s2s_auth_dane.lua @ 1506:a40f9b8661d8
mod_s2s_auth_dane: Fix stringprepping when doing "DANE Light"
author | Kim Alvefur <zash@zash.se> |
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date | Tue, 16 Sep 2014 19:53:41 +0200 |
parents | 72ef98818b90 |
children | 6ea13869753f |
rev | line source |
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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 do |
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51 local cert_mt = debug.getregistry()["SSL:Certificate"]; |
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52 if cert_mt and cert_mt.__index.issued then |
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53 -- Need cert:issued() for these |
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54 implemented_uses:add("DANE-TA"); |
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55 implemented_uses:add("PKIX-CA"); |
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56 else |
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57 module:log("warn", "Unable to support DANE-TA and PKIX-CA"); |
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58 end |
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59 end |
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60 local configured_uses = module:get_option_set("dane_uses", { "DANE-EE", "DANE-TA" }); |
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61 local enabled_uses = set.intersection(implemented_uses, configured_uses) / function(use) return use_map[use] end; |
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62 |
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63 local function dane_lookup(host_session, cb, a,b,c,e) |
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64 if host_session.dane ~= nil then return end |
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65 if host_session.direction == "incoming" then |
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66 local name = host_session.from_host and idna_to_ascii(host_session.from_host); |
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67 if not name then return end |
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68 host_session.dane = dns_lookup(function (answer) |
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69 host_session.dane = false; |
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70 if not answer.secure then |
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71 if cb then return cb(a,b,c,e); end |
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72 return; |
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73 end |
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74 local n = #answer |
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75 if n == 0 then if cb then return cb(a,b,c,e); end return end |
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76 if n == 1 and answer[1].srv.target == '.' then return end |
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77 local srv_hosts = { answer = answer }; |
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78 local dane = {}; |
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79 host_session.dane = dane; |
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80 host_session.srv_hosts = srv_hosts; |
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81 for _, record in ipairs(answer) do |
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82 t_insert(srv_hosts, record.srv); |
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83 dns_lookup(function(dane_answer) |
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84 n = n - 1; |
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85 if dane_answer.bogus then |
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86 -- How to handle this? |
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87 elseif dane_answer.secure then |
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88 for _, record in ipairs(dane_answer) do |
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89 t_insert(dane, record); |
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90 end |
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91 end |
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92 if n == 0 and cb then return cb(a,b,c,e); end |
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93 end, ("_%d._tcp.%s."):format(record.srv.port, record.srv.target), "TLSA"); |
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94 end |
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95 end, "_xmpp-server._tcp."..name..".", "SRV"); |
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96 return true; |
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97 elseif host_session.direction == "outgoing" then |
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98 local srv_hosts = host_session.srv_hosts; |
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99 if not ( srv_hosts and srv_hosts.answer and srv_hosts.answer.secure ) then return end |
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100 local srv_choice = srv_hosts[host_session.srv_choice]; |
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101 host_session.dane = dns_lookup(function(answer) |
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102 if answer and ((answer.secure and #answer > 0) or answer.bogus) then |
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103 srv_choice.dane = answer; |
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104 else |
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105 srv_choice.dane = false; |
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106 end |
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107 host_session.dane = srv_choice.dane; |
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108 if cb then return cb(a,b,c,e); end |
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109 end, ("_%d._tcp.%s."):format(srv_choice.port, srv_choice.target), "TLSA"); |
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110 return true; |
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111 end |
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112 end |
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113 |
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114 function module.add_host(module) |
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115 local function on_new_s2s(event) |
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116 local host_session = event.origin; |
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117 if host_session.type == "s2sout" or host_session.type == "s2sin" or host_session.dane ~= nil then return end -- Already authenticated |
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118 local function resume() |
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119 host_session.log("debug", "DANE lookup completed, resuming connection"); |
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120 host_session.conn:resume() |
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121 end |
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122 if dane_lookup(host_session, resume) then |
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123 host_session.log("debug", "Pausing connection until DANE lookup is completed"); |
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124 host_session.conn:pause() |
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125 end |
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126 end |
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127 |
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128 -- New outgoing connections |
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129 module:hook("stanza/http://etherx.jabber.org/streams:features", on_new_s2s, 501); |
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130 module:hook("s2sout-authenticate-legacy", on_new_s2s, 200); |
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131 |
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132 -- New incoming connections |
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133 module:hook("s2s-stream-features", on_new_s2s, 10); |
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134 |
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135 module:hook("s2s-authenticated", function(event) |
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136 local session = event.session; |
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137 if session.dane and not session.secure then |
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138 -- TLSA record but no TLS, not ok. |
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139 -- TODO Optional? |
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140 -- Bogus replies should trigger this path |
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141 -- How does this interact with Dialback? |
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142 session:close({ |
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143 condition = "policy-violation", |
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144 text = "Encrypted server-to-server communication is required but was not " |
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145 ..((session.direction == "outgoing" and "offered") or "used") |
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146 }); |
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147 return false; |
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148 end |
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149 -- Cleanup |
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150 session.dane = nil; |
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151 session.srv_hosts = nil; |
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152 end); |
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153 end |
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154 |
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155 local function one_dane_check(tlsa, cert) |
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156 local select, match, certdata = tlsa.select, tlsa.match; |
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157 |
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158 if select == 0 then |
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159 certdata = pem2der(cert:pem()); |
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160 elseif select == 1 and cert.pubkey then |
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161 certdata = pem2der(cert:pubkey()); |
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162 else |
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163 module:log("warn", "DANE selector %s is unsupported", tlsa:getSelector() or select); |
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164 return; |
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165 end |
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166 |
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167 if match == 1 then |
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168 certdata = hashes.sha256(certdata); |
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169 elseif match == 2 then |
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170 certdata = hashes.sha512(certdata); |
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171 elseif match ~= 0 then |
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172 module:log("warn", "DANE match rule %s is unsupported", tlsa:getMatchType() or match); |
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173 return; |
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174 end |
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175 |
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176 return certdata == tlsa.data; |
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177 end |
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178 |
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179 module:hook("s2s-check-certificate", function(event) |
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180 local session, cert, host = event.session, event.cert, event.host; |
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181 if not cert then return end |
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182 local log = session.log or module._log; |
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183 local dane = session.dane; |
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184 if type(dane) == "table" then |
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185 local use, tlsa, match_found, supported_found, chain, leafcert, cacert, is_match; |
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186 for i = 1, #dane do |
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187 tlsa = dane[i].tlsa; |
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188 module:log("debug", "TLSA #%d: %s", i, tostring(tlsa)) |
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189 use = tlsa.use; |
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190 |
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191 if enabled_uses:contains(use) then |
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192 -- PKIX-EE or DANE-EE |
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193 if use == 1 or use == 3 then |
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194 -- Should we check if the cert subject matches? |
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195 is_match = one_dane_check(tlsa, cert); |
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196 if is_match ~= nil then |
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197 supported_found = true; |
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198 end |
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199 if is_match then |
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200 log("info", "DANE validated ok for %s using %s", host, tlsa:getUsage()); |
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201 session.cert_identity_status = "valid"; |
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202 if use == 3 then -- DANE-EE, chain status equals DNSSEC chain status |
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203 session.cert_chain_status = "valid"; |
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204 -- for usage 1, PKIX-EE, the chain has to be valid already |
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205 end |
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206 match_found = true; |
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207 break; |
1258
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208 end |
1396
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209 elseif use == 0 or use == 2 then |
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210 supported_found = true; |
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211 if chain == nil then |
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212 chain = session.conn:socket():getpeerchain(); |
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213 end |
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214 for i = 2, #chain do |
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215 cacert, leafcert = chain[i], chain[i-1]; |
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216 is_match = one_dane_check(tlsa, cacert); |
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217 if is_match ~= nil then |
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218 supported_found = true; |
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219 end |
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220 if use == 2 and not cacert:issued(leafcert or cacert) then |
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221 module:log("debug", "Broken chain"); |
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222 break; |
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223 end |
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224 if is_match then |
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225 log("info", "DANE validated ok for %s using %s", host, tlsa:getUsage()); |
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226 if use == 2 then -- DANE-TA |
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227 session.cert_identity_status = "valid"; |
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228 session.cert_chain_status = "valid"; |
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229 -- for usage 0, PKIX-CA, identity and chain has to be valid already |
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230 end |
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231 match_found = true; |
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232 break; |
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233 end |
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234 end |
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235 if match_found then break end |
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236 end |
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237 end |
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238 end |
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239 if supported_found and not match_found or dane.bogus then |
1332
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240 -- No TLSA matched or response was bogus |
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241 local why = "No TLSA matched certificate"; |
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242 if dane.bogus then |
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243 why = "Bogus: "..tostring(dane.bogus); |
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244 end |
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245 log("warn", "DANE validation failed: %s", why); |
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246 session.cert_identity_status = "invalid"; |
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247 session.cert_chain_status = "invalid"; |
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248 end |
1370
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249 else |
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250 if session.cert_chain_status == "valid" and session.cert_identity_status ~= "valid" |
1411
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251 and session.srv_hosts and session.srv_hosts.answer and session.srv_hosts.answer.secure then |
1370
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252 local srv_hosts, srv_choice, srv_target = session.srv_hosts, session.srv_choice; |
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253 for i = srv_choice or 1, srv_choice or #srv_hosts do |
1415
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|
254 srv_target = session.srv_hosts[i].target:gsub("%.?$",""); |
1431
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|
255 log("debug", "Comparing certificate with Secure SRV target %s", srv_target); |
1506
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|
256 srv_target = nameprep(idna_to_unicode(srv_target)); |
1370
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257 if srv_target and cert_verify_identity(srv_target, "xmpp-server", cert) then |
1437
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258 log("info", "Certificate for %s matches Secure SRV target %s", host, srv_target); |
1370
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259 session.cert_identity_status = "valid"; |
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260 return; |
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261 end |
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262 end |
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263 end |
1258
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264 end |
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265 end); |
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266 |