prosody
783056b4e448
plugins/mod_s2s_auth_certs.lua

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plugins/mod_s2s_auth_certs.lua @ 12181:783056b4e448 0.11 0.11.12

util.xml: Do not allow doctypes, comments or processing instructions Yes. This is as bad as it sounds. CVE pending. In Prosody itself, this only affects mod_websocket, which uses util.xml to parse the <open/> frame, thus allowing unauthenticated remote DoS using Billion Laughs. However, third-party modules using util.xml may also be affected by this. This commit installs handlers which disallow the use of doctype declarations and processing instructions without any escape hatch. It, by default, also introduces such a handler for comments, however, there is a way to enable comments nontheless. This is because util.xml is used to parse human-facing data, where comments are generally a desirable feature, and also because comments are generally harmless.
author Jonas Schäfer <jonas@wielicki.name>
date Mon, 10 Jan 2022 18:23:54 +0100
parent 6373:84e7e418c29a
child 10226:77f900bbbf25
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1 module:set_global();
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2
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3 local cert_verify_identity = require "util.x509".verify_identity;
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4 local NULL = {};
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5 local log = module._log;
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6
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7 module:hook("s2s-check-certificate", function(event)
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8 local session, host, cert = event.session, event.host, event.cert;
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9 local conn = session.conn:socket();
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10 local log = session.log or log;
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11
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12 if not cert then
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13 log("warn", "No certificate provided by %s", host or "unknown host");
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14 return;
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15 end
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16
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17 local chain_valid, errors;
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18 if conn.getpeerverification then
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19 chain_valid, errors = conn:getpeerverification();
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20 elseif conn.getpeerchainvalid then -- COMPAT mw/luasec-hg
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21 chain_valid, errors = conn:getpeerchainvalid();
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22 errors = (not chain_valid) and { { errors } } or nil;
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23 else
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24 chain_valid, errors = false, { { "Chain verification not supported by this version of LuaSec" } };
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25 end
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26 -- Is there any interest in printing out all/the number of errors here?
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27 if not chain_valid then
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28 log("debug", "certificate chain validation result: invalid");
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29 for depth, t in pairs(errors or NULL) do
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30 log("debug", "certificate error(s) at depth %d: %s", depth-1, table.concat(t, ", "))
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31 end
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32 session.cert_chain_status = "invalid";
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33 else
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34 log("debug", "certificate chain validation result: valid");
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35 session.cert_chain_status = "valid";
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37 -- We'll go ahead and verify the asserted identity if the
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38 -- connecting server specified one.
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39 if host then
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40 if cert_verify_identity(host, "xmpp-server", cert) then
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41 session.cert_identity_status = "valid"
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42 else
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43 session.cert_identity_status = "invalid"
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44 end
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45 log("debug", "certificate identity validation result: %s", session.cert_identity_status);
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46 end
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47 end
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48 end, 509);
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49