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annotate mod_s2s_auth_fingerprint/mod_s2s_auth_fingerprint.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 b21236b6b8d8
children 703041357f89
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d0e71a3bd2c4 mod_s2s_auth_fingerprint: New module for authenticating s2s connections based on preconfigured fingerprints.
Kim Alvefur <zash@zash.se>
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1 -- Copyright (C) 2013 Kim Alvefur
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2 -- This file is MIT/X11 licensed.
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3
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4 module:set_global();
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5
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6 local digest_algo = module:get_option_string(module:get_name().."_digest", "sha1");
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7 local must_match = module:get_option_boolean("s2s_pin_fingerprints", false);
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9 local fingerprints = {};
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11 local function hashprep(h)
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12 return tostring(h):lower():gsub(":","");
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13 end
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15 for host, set in pairs(module:get_option("s2s_trusted_fingerprints", {})) do
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16 local host_set = {}
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17 if type(set) == "table" then -- list of fingerprints
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18 for i=1,#set do
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19 host_set[hashprep(set[i])] = true;
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20 end
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21 else -- assume single fingerprint
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22 host_set[hashprep(set)] = true;
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23 end
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24 fingerprints[host] = host_set;
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25 end
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27 module:hook("s2s-check-certificate", function(event)
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28 local session, host, cert = event.session, event.host, event.cert;
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29
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30 local host_fingerprints = fingerprints[host];
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31 if host_fingerprints then
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32 local digest = cert and cert:digest(digest_algo);
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33 if host_fingerprints[digest] then
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34 session.cert_chain_status = "valid";
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35 session.cert_identity_status = "valid";
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36 return true;
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37 elseif must_match then
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38 session.cert_chain_status = "invalid";
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39 session.cert_identity_status = "invalid";
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40 end
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41 end
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42 end);