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annotate mod_s2s_auth_dane/mod_s2s_auth_dane.lua @ 1332:08a0241f5d2c

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mod_s2s_auth_dane: Add some comments
author Kim Alvefur <zash@zash.se>
date Fri, 07 Mar 2014 23:30:34 +0100
parents bb6f3312ab46
children 15912b077370
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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 pat = "%-%-%-%-%-BEGIN ([A-Z ]+)%-%-%-%-%-\r?\n"..
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18 "([0-9A-Za-z=+/\r\n]*)\r?\n%-%-%-%-%-END %1%-%-%-%-%-";
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19 local function pem2der(pem)
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20 local typ, data = pem:match(pat);
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21 if typ and data then
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22 return base64.decode(data), typ;
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23 end
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24 end
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25
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26 -- TODO Things to test/handle:
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27 -- Negative or bogus answers
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28 -- No SRV records
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29 -- No encryption offered
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30
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31 -- This function is called when a new SRV target has been picked
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32 -- the original function does A/AAAA resolution before continuing
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33 local _try_connect = s2sout.try_connect;
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34 function s2sout.try_connect(host_session, connect_host, connect_port, err)
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35 local srv_hosts = host_session.srv_hosts;
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36 local srv_choice = host_session.srv_choice;
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37 if srv_hosts and srv_hosts.answer.secure and not srv_hosts[srv_choice].dane then
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38 srv_hosts[srv_choice].dane = dns_lookup(function(answer)
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39 if answer and ( #answer > 0 or answer.bogus ) then
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40 srv_hosts[srv_choice].dane = answer;
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41 for i, tlsa in ipairs(answer) do
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42 module:log("debug", "TLSA %s", tostring(tlsa));
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43 end
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44 else
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45 srv_hosts[srv_choice].dane = false;
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46 end
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47 -- "blocking" until TLSA reply, but no race condition
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48 return _try_connect(host_session, connect_host, connect_port, err);
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49 end, ("_%d._tcp.%s"):format(connect_port, connect_host), "TLSA");
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50 return true
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51 end
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52 return _try_connect(host_session, connect_host, connect_port, err);
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53 end
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54
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55 module:hook("s2s-check-certificate", function(event)
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56 local session, cert = event.session, event.cert;
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57 local srv_hosts = session.srv_hosts;
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58 local srv_choice = session.srv_choice;
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59 local choosen = srv_hosts and srv_hosts[srv_choice];
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60 if choosen and choosen.dane then
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61 local use, select, match, tlsa, certdata, match_found;
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62 for i, rr in ipairs(choosen.dane) do
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63 tlsa = rr.tlsa;
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64 module:log("debug", "TLSA %s", tostring(tlsa));
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65 use, select, match, certdata = tlsa.use, tlsa.select, tlsa.match;
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66
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67 -- PKIX-EE or DANE-EE
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68 if use == 1 or use == 3 then
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69
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70 if select == 0 then
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71 certdata = pem2der(cert:pem());
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72 elseif select == 1 and cert.pubkey then
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73 certdata = pem2der(cert:pubkey());
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74 else
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75 module:log("warn", "DANE selector %d is unsupported", select);
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76 end
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77
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78 if match == 1 then
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79 certdata = hashes.sha256(certdata);
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80 elseif match == 2 then
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81 certdata = hashes.sha512(certdata);
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82 elseif match ~= 0 then
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83 module:log("warn", "DANE match rule %d is unsupported", match);
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84 certdata = nil;
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85 end
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86
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87 -- Should we check if the cert subject matches?
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88 if certdata and certdata == tlsa.data then
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89 (session.log or module._log)("info", "DANE validation successful");
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90 session.cert_identity_status = "valid";
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91 if use == 3 then -- DANE-EE, chain status equals DNSSEC chain status
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92 session.cert_chain_status = "valid";
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93 -- for usage 1, PKIX-EE, the chain has to be valid already
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94 end
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95 match_found = true;
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96 break;
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97 end
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98 else
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99 module:log("warn", "DANE %s is unsupported", tlsa:getUsage() or ("usage "..tostring(use)));
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100 -- TODO CA checks needs to loop over the chain and stuff
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101 end
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102 end
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103 if not match_found then
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104 -- No TLSA matched or response was bogus
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105 (session.log or module._log)("warn", "DANE validation failed");
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106 session.cert_identity_status = "invalid";
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107 session.cert_chain_status = "invalid";
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108 end
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109 end
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110 end);
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111
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112 function module.add_host(module)
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113 module:hook("s2s-authenticated", function(event)
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114 local session = event.session;
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115 local srv_hosts = session.srv_hosts;
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116 local srv_choice = session.srv_choice;
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117 if srv_hosts[srv_choice].dane and not session.secure then
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118 -- TLSA record but no TLS, not ok.
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119 -- TODO Optional?
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120 session:close({
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121 condition = "policy-violation",
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122 text = "Encrypted server-to-server communication is required but was not "
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123 ..((session.direction == "outgoing" and "offered") or "used")
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124 });
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125 return false;
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126 end
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127 end);
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128 end
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129
1258
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130 function module.unload()
1332
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131 -- Restore the original try_connect function
1258
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132 s2sout.try_connect = _try_connect;
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133 end
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134