prosody
3a1b1d3084fb
plugins/mod_s2s_auth_certs.lua

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plugins/mod_s2s_auth_certs.lua @ 10721:3a1b1d3084fb 0.11

core.certmanager: Move EECDH ciphers before EDH in default cipherstring (fixes #1513) Backport of 94e341dee51c The original intent of having kEDH before kEECDH was that if a `dhparam` file was specified, this would be interpreted as a preference by the admin for old and well-tested Diffie-Hellman key agreement over newer elliptic curve ones. Otherwise the faster elliptic curve ciphersuites would be preferred. This didn't really work as intended since this affects the ClientHello on outgoing s2s connections, leading to some servers using poorly configured kEDH. With Debian shipping OpenSSL settings that enforce a higher security level, this caused interoperability problems with servers that use DH params smaller than 2048 bits. E.g. jabber.org at the time of this writing has 1024 bit DH params. MattJ says > Curves have won, and OpenSSL is less weird about them now
author Kim Alvefur <zash@zash.se>
date Sun, 25 Aug 2019 20:22:35 +0200
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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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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36
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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