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annotate mod_s2s_auth_dane/mod_s2s_auth_dane.lua @ 1328:446fcda4ec45

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mod_s2s_auth_dane: Delay s2sout state machine until we get TLSA reply
author Kim Alvefur <zash@zash.se>
date Wed, 05 Mar 2014 17:40:44 +0100
parents b93f45c42044
children 8d99b9c4cf0c
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1 -- mod_s2s_auth_dane
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2 --
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3 -- Between the DNS lookup and the certificate validation, there is a race condition.
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4 -- Solving that probably requires changes to mod_s2s, like using util.async
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5
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6
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7 module:set_global();
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8
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9 local dns_lookup = require"net.adns".lookup;
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10 local hashes = require"util.hashes";
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11 local base64 = require"util.encodings".base64;
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12
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13 local s2sout = module:depends"s2s".route_to_new_session.s2sout;
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14 local _try_connect = s2sout.try_connect;
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15
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16 local pat = "%-%-%-%-%-BEGIN ([A-Z ]+)%-%-%-%-%-\r?\n"..
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17 "([0-9A-Za-z=+/\r\n]*)\r?\n%-%-%-%-%-END %1%-%-%-%-%-";
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18 local function pem2der(pem)
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19 local typ, data = pem:match(pat);
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20 if typ and data then
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21 return base64.decode(data), typ;
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22 end
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23 end
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24
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25 -- TODO Things to test/handle:
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26 -- Negative or bogus answers
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27 -- No SRV records
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28 -- No encryption offered
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29
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30 function s2sout.try_connect(host_session, connect_host, connect_port, err)
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31 local srv_hosts = host_session.srv_hosts;
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32 local srv_choice = host_session.srv_choice;
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33 if srv_hosts and srv_hosts.answer.secure and not srv_hosts[srv_choice].dane then
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34 srv_hosts[srv_choice].dane = dns_lookup(function(answer)
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35 if answer and ( #answer > 0 or answer.bogus ) then
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36 srv_hosts[srv_choice].dane = answer;
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37 for i, tlsa in ipairs(answer) do
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38 module:log("debug", "TLSA %s", tostring(tlsa));
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39 end
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40 else
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41 srv_hosts[srv_choice].dane = false;
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42 end
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43 -- "blocking" until TLSA reply, but no race condition
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44 return _try_connect(host_session, connect_host, connect_port, err);
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45 end, ("_%d._tcp.%s"):format(connect_port, connect_host), "TLSA");
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46 return true
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47 end
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48 return _try_connect(host_session, connect_host, connect_port, err);
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49 end
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50
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51 module:hook("s2s-check-certificate", function(event)
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52 local session, cert = event.session, event.cert;
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53 local srv_hosts = session.srv_hosts;
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54 local srv_choice = session.srv_choice;
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55 local choosen = srv_hosts and srv_hosts[srv_choice];
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56 if choosen and choosen.dane then
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57 local use, select, match, tlsa, certdata, match_found;
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58 for i, rr in ipairs(choosen.dane) do
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59 tlsa = rr.tlsa;
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60 module:log("debug", "TLSA %s", tostring(tlsa));
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61 use, select, match, certdata = tlsa.use, tlsa.select, tlsa.match;
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62
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63 -- PKIX-EE or DANE-EE
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64 if use == 1 or use == 3 then
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65
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66 if select == 0 then
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67 certdata = pem2der(cert:pem());
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68 elseif select == 1 then
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69 certdata = pem2der(cert:pubkey());
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70 else
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71 module:log("warn", "DANE selector %d is unsupported", select);
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72 end
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73
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74 if match == 1 then
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75 certdata = hashes.sha256(certdata);
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76 elseif match == 2 then
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77 certdata = hashes.sha512(certdata);
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78 elseif match ~= 0 then
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79 module:log("warn", "DANE match rule %d is unsupported", match);
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80 certdata = nil;
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81 end
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82
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83 -- Should we check if the cert subject matches?
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84 if certdata and certdata == tlsa.data then
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85 (session.log or module._log)("info", "DANE validation successful");
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86 session.cert_identity_status = "valid";
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87 if use == 3 then -- DANE-EE, chain status equals DNSSEC chain status
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88 session.cert_chain_status = "valid";
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89 -- for usage 1, PKIX-EE, the chain has to be valid already
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90 end
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91 match_found = true;
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92 break;
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93 end
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94 else
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95 module:log("warn", "DANE %s is unsupported", tlsa:getUsage() or ("usage "..tostring(use)));
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96 -- TODO CA checks needs to loop over the chain and stuff
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97 end
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98 end
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99 if not match_found then
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100 (session.log or module._log)("warn", "DANE validation failed");
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101 session.cert_identity_status = "invalid";
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102 session.cert_chain_status = "invalid";
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103 end
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104 end
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105 end);
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106
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107 function module.unload()
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108 s2sout.try_connect = _try_connect;
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109 end
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110