prosody
74b9e05af71e
plugins/mod_s2s_auth_certs.lua

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plugins/mod_s2s_auth_certs.lua @ 12977:74b9e05af71e

plugins: Prefix module imports with prosody namespace
author Kim Alvefur <zash@zash.se>
date Fri, 24 Mar 2023 13:15:28 +0100
parent 12816:02f8b10d73e8
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92d009af6eba mod_s2s_auth_certs: Split PKIX based certificate checking from mod_s2s into new plugin
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1 module:set_global();
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2
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3 local cert_verify_identity = require "prosody.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 local measure_cert_statuses = module:metric("counter", "checked", "", "Certificate validation results",
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8 { "chain"; "identity" })
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9
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10 module:hook("s2s-check-certificate", function(event)
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11 local session, host, cert = event.session, event.host, event.cert;
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12 local conn = session.conn;
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13 local log = session.log or log;
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14
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15 local secure_hostname = conn.extra and conn.extra.secure_hostname;
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16
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17 if not cert then
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18 log("warn", "No certificate provided by %s", host or "unknown host");
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19 return;
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20 end
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21
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22 local chain_valid, errors;
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23 if conn.ssl_peerverification then
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24 chain_valid, errors = conn:ssl_peerverification();
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25 else
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26 chain_valid, errors = false, { { "Chain verification not supported by this version of LuaSec" } };
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27 end
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28 -- Is there any interest in printing out all/the number of errors here?
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29 if not chain_valid then
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30 log("debug", "certificate chain validation result: invalid");
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31 for depth, t in pairs(errors or NULL) do
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32 log("debug", "certificate error(s) at depth %d: %s", depth-1, table.concat(t, ", "))
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33 end
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34 session.cert_chain_status = "invalid";
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35 session.cert_chain_errors = errors;
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36 else
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37 log("debug", "certificate chain validation result: valid");
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38 session.cert_chain_status = "valid";
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39
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40 -- We'll go ahead and verify the asserted identity if the
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41 -- connecting server specified one.
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42 if host then
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43 if cert_verify_identity(host, "xmpp-server", cert) then
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44 session.cert_identity_status = "valid"
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45 else
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46 session.cert_identity_status = "invalid"
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47 end
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48 log("debug", "certificate identity validation result: %s", session.cert_identity_status);
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49 end
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50
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51 -- Check for DNSSEC-signed SRV hostname
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52 if secure_hostname and session.cert_identity_status ~= "valid" then
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53 if cert_verify_identity(secure_hostname, "xmpp-server", cert) then
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54 module:log("info", "Secure SRV name delegation %q -> %q", secure_hostname, host);
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55 session.cert_identity_status = "valid"
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56 end
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57 end
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58 end
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59 measure_cert_statuses:with_labels(session.cert_chain_status or "unknown", session.cert_identity_status or "unknown"):add(1);
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60 end, 509);
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61