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annotate mod_s2s_keysize_policy/mod_s2s_keysize_policy.lua @ 4537:53ee391ca689

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mod_smacks: Fix traceback due to session being destroyed in send() Sending something can cause the OS to notice that the connection is dead and then the connection can be dead at this point. More likely if opportunistic_writes is enabled.
author Kim Alvefur <zash@zash.se>
date Thu, 01 Apr 2021 11:35:26 +0200
parents 27ffa6521d4e
children
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5294c8c1861c mod_s2s_keysize_policy: Don't trust keys weaker than 2048 bit RSA after 31 December 2013
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1 -- mod_s2s_keysize_policy.lua
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fc42f8484451 mod_s2s_keysize_policy: Add note about required LuaSec patch
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2 -- Requires LuaSec with this patch: https://github.com/brunoos/luasec/pull/12
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4 module:set_global();
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5
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6 local datetime_parse = require"util.datetime".parse;
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7 local pat = "^([JFMAONSD][ceupao][glptbvyncr]) ?(%d%d?) (%d%d):(%d%d):(%d%d) (%d%d%d%d) GMT$";
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8 local months = {Jan=1,Feb=2,Mar=3,Apr=4,May=5,Jun=6,Jul=7,Aug=8,Sep=9,Oct=10,Nov=11,Dec=12};
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9 local function parse_x509_datetime(s)
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10 local month, day, hour, min, sec, year = s:match(pat); month = months[month];
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11 return datetime_parse(("%04d-%02d-%02dT%02d:%02d:%02dZ"):format(year, month, day, hour, min, sec));
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12 end
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13
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14 local weak_key_cutoff = datetime_parse("2014-01-01T00:00:00Z");
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16 -- From RFC 4492
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17 local weak_key_size = {
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18 RSA = 2048,
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19 DSA = 2048,
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20 DH = 2048,
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21 EC = 233,
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22 }
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23
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24 module:hook("s2s-check-certificate", function(event)
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25 local host, session, cert = event.host, event.session, event.cert;
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26 if cert and cert.pubkey then
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27 local _, key_type, key_size = cert:pubkey();
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28 if key_size < ( weak_key_size[key_type] or 0 ) then
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b21236b6b8d8 Backed out changeset 853a382c9bd6
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29 local issued = parse_x509_datetime(cert:notbefore());
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30 if issued > weak_key_cutoff then
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27ffa6521d4e mod_s2s_keysize_policy: Lower log message to a warning since it is not really a fatal error
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31 session.log("warn", "%s has a %s-bit %s key issued after 31 December 2013, invalidating trust!", host, key_size, key_type);
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32 session.cert_chain_status = "invalid";
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33 session.cert_identity_status = "invalid";
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34 else
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35 session.log("warn", "%s has a %s-bit %s key", host, key_size, key_type);
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36 end
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37 else
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38 session.log("info", "%s has a %s-bit %s key", host, key_size, key_type);
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39 end
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40 end
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41 end);