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comparison plugins/mod_saslauth.lua @ 13281:288ddca37639

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mod_saslauth: Get correct 'tls-server-end-point' with new LuaSec API MattJ contributed new APIs for retrieving the actually used certificate and chain to LuaSec, which are not in a release at the time of this commit.
author Kim Alvefur <zash@zash.se>
date Sun, 23 Oct 2022 02:49:05 +0200
parents aa17086a9c8a
children 63419a628c69
comparison
equal deleted inserted replaced
13280:cf8a6710c91c 13281:288ddca37639
262 262
263 local function tls_server_end_point(self) 263 local function tls_server_end_point(self)
264 local cert_hash = self.userdata["tls-server-end-point"]; 264 local cert_hash = self.userdata["tls-server-end-point"];
265 if cert_hash then return hex.from(cert_hash); end 265 if cert_hash then return hex.from(cert_hash); end
266 266
267 local conn = self.userdata["tls-server-end-point-conn"];
268 local cert = conn.getlocalcertificate and conn:getlocalcertificate();
269
270 if not cert then
271 -- We don't know that this is the right cert, it could have been replaced on
272 -- disk since we started.
273 local certfile = self.userdata["tls-server-end-point-cert"];
274 if not certfile then return end
275 local f = io.open(certfile);
276 if not f then return end
277 local certdata = f:read("*");
278 cert = ssl.loadcertificate(certdata);
279 end
280
267 -- Hash function selection, see RFC 5929 §4.1 281 -- Hash function selection, see RFC 5929 §4.1
268 local certfile = self.userdata["tls-server-end-point-cert"];
269 if not certfile then return end
270 local f = io.open(certfile);
271 if not f then return end
272 local hash = hashes.sha256; 282 local hash = hashes.sha256;
273
274 -- FIXME TOCTOU
275 -- We don't know that this is the right cert, it could have been replaced on
276 -- disk since we started. Best would be if we could extract the cert used
277 -- from the SSL context.
278 local certdata = f:read("*");
279 local cert = ssl.loadcertificate(certdata);
280
281 if cert.getsignaturename then 283 if cert.getsignaturename then
282 local sigalg = cert:getsignaturename():lower():match("sha%d+"); 284 local sigalg = cert:getsignaturename():lower():match("sha%d+");
283 if sigalg and sigalg ~= "sha1" and hashes[sigalg] then 285 if sigalg and sigalg ~= "sha1" and hashes[sigalg] then
284 -- This should have ruled out MD5 and SHA1 286 -- This should have ruled out MD5 and SHA1
285 hash = hashes[sigalg]; 287 hash = hashes[sigalg];
335 end 337 end
336 sasl_handler["userdata"] = { 338 sasl_handler["userdata"] = {
337 ["tls-unique"] = origin.conn; 339 ["tls-unique"] = origin.conn;
338 ["tls-exporter"] = origin.conn; 340 ["tls-exporter"] = origin.conn;
339 ["tls-server-end-point-cert"] = certfile; 341 ["tls-server-end-point-cert"] = certfile;
342 ["tls-server-end-point-conn"] = origin.conn;
340 ["tls-server-end-point"] = tls_server_end_point_hash; 343 ["tls-server-end-point"] = tls_server_end_point_hash;
341 }; 344 };
342 else 345 else
343 log("debug", "Channel binding not supported by SASL handler"); 346 log("debug", "Channel binding not supported by SASL handler");
344 end 347 end