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annotate mod_watchuntrusted/mod_watchuntrusted.lua @ 4853:3804332c204e

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mod_tcpproxy: Reject missing or non-number block-size, as per XEP-0047
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Fri, 07 Jan 2022 19:55:03 +0100
parents 0e78523f8c20
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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5eaecb7f680d mod_watchuntrusted: New module that will warn admins about s2s connections that fail due to lack of encryption or invalid certificates.
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1 local jid_prep = require "util.jid".prep;
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2
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3 local secure_auth = module:get_option_boolean("s2s_secure_auth", false);
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4 local secure_domains, insecure_domains =
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5 module:get_option_set("s2s_secure_domains", {})._items, module:get_option_set("s2s_insecure_domains", {})._items;
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6
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7 local ignore_domains = module:get_option_set("untrusted_ignore_domains", {})._items;
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9 local untrusted_fail_watchers = module:get_option_set("untrusted_fail_watchers", module:get_option("admins", {})) / jid_prep;
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10 local untrusted_fail_notification = module:get_option("untrusted_fail_notification", "Establishing a secure connection from $from_host to $to_host failed. Certificate hash: $sha256. $errors");
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12 local msg_type = module:get_option_string("untrusted_message_type", "chat");
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14 local st = require "util.stanza";
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16 local notified_about_already = { };
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18 module:hook_global("s2s-check-certificate", function (event)
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19 local session, host = event.session, event.host;
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20 if not host then return end
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21 local conn = session.conn:socket();
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22 local local_host = session.direction == "outgoing" and session.from_host or session.to_host;
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24 if not (local_host == module:get_host()) then return end
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26 module:log("debug", "Checking certificate...");
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27 local certificate_is_valid = false;
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28
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29 if session.cert_chain_status == "valid" and session.cert_identity_status == "valid" then
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30 certificate_is_valid = true;
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31 end
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33 local must_secure = secure_auth;
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35 if not must_secure and secure_domains[host] then
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36 must_secure = true;
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37 elseif must_secure and insecure_domains[host] then
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38 must_secure = false;
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39 end
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41 if must_secure and not certificate_is_valid and not notified_about_already[host] and not ignore_domains[host] then
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42 notified_about_already[host] = os.time();
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43 local _, errors = conn:getpeerverification();
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44 local error_message = "";
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46 for depth, t in pairs(errors or {}) do
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47 if #t > 0 then
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48 error_message = error_message .. "Error with certificate " .. (depth - 1) .. ": " .. table.concat(t, ", ") .. ". ";
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49 end
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50 end
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52 if session.cert_identity_status then
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53 error_message = error_message .. "This certificate is " .. session.cert_identity_status .. " for " .. host .. ".";
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54 end
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55
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56 local replacements = {
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57 sha1 = event.cert and event.cert:digest("sha1") or "(No certificate)",
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58 sha256 = event.cert and event.cert:digest("sha256") or "(No certificate)",
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59 errors = error_message
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60 };
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61
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62 local message = st.message({ type = msg_type, from = local_host },
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63 untrusted_fail_notification:gsub("%$([%w_]+)", function (v)
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64 return event[v] or session and session[v] or replacements and replacements[v] or nil;
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65 end));
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66 for jid in untrusted_fail_watchers do
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67 module:log("debug", "Notifying %s", jid);
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68 message.attr.to = jid;
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69 module:send(message);
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70 end
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71 end
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72 end, -0.5);
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73
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74 module:add_timer(14400, function (now)
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75 for host, time in pairs(notified_about_already) do
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76 if time + 86400 < now then
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77 notified_about_already[host] = nil;
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78 end
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79 end
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80 return 14400;
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81 end)