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annotate mod_audit/mod_audit.lua @ 5251:f3123cbbd894

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mod_audit: Allow disabling IP logging, or limiting it to a prefix
author Matthew Wild <mwild1@gmail.com>
date Tue, 14 Mar 2023 18:59:39 +0000
parents d9577083c5f5
children 12f7d8b901e0
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1 module:set_global();
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2
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3 local audit_log_limit = module:get_option_number("audit_log_limit", 10000);
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4 local cleanup_after = module:get_option_string("audit_log_expires_after", "2w");
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5
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6 local attach_ips = module:get_option_boolean("audit_log_ips", true);
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7 local attach_ipv4_prefix = module:get_option_number("audit_log_ipv4_prefix", nil);
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8 local attach_ipv6_prefix = module:get_option_number("audit_log_ipv6_prefix", nil);
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9
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10 local time_now = os.time;
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11 local ip = require "util.ip";
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12 local st = require "util.stanza";
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13 local moduleapi = require "core.moduleapi";
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15 local host_wide_user = "@";
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16
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17 local stores = {};
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18
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19 local function get_store(self, host)
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20 local store = rawget(self, host);
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21 if store then
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22 return store
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23 end
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24 store = module:context(host):open_store("audit", "archive");
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25 rawset(self, host, store);
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26 return store;
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27 end
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28
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29 setmetatable(stores, { __index = get_store });
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30
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31 local function get_ip_network(ip_addr)
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32 local _ip = ip.new_ip(ip_addr);
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33 local proto = _ip.proto;
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34 local network;
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35 if proto == "IPv4" and attach_ipv4_prefix then
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36 network = ip.truncate(_ip, attach_ipv4_prefix).normal.."/"..attach_ipv4_prefix;
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37 elseif proto == "IPv6" and attach_ipv6_prefix then
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38 network = ip.truncate(_ip, attach_ipv6_prefix).normal.."/"..attach_ipv6_prefix;
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39 end
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40 return network;
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41 end
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42
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43 local function session_extra(session)
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44 local attr = {
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45 xmlns = "xmpp:prosody.im/audit",
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46 };
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47 if session.id then
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48 attr.id = session.id;
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49 end
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50 if session.type then
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51 attr.type = session.type;
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52 end
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53 local stanza = st.stanza("session", attr);
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54 if attach_ips and session.ip then
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55 local remote_ip, network = session.ip;
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56 if attach_ipv4_prefix or attach_ipv6_prefix then
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57 network = get_ip_network(remote_ip);
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58 end
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59 stanza:text_tag("remote-ip", network or remote_ip);
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60 end
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61 if session.client_id then
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62 stanza:text_tag("client", session.client_id);
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63 end
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64 return stanza
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65 end
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66
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67 local function audit(host, user, source, event_type, extra)
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68 if not host or host == "*" then
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69 error("cannot log audit events for global");
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70 end
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71 local user_key = user or host_wide_user;
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72
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73 local attr = {
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74 ["source"] = source,
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75 ["type"] = event_type,
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76 };
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77 if user_key ~= host_wide_user then
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78 attr.user = user_key;
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79 end
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80 local stanza = st.stanza("audit-event", attr);
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81 if extra ~= nil then
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82 if extra.session then
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83 local child = session_extra(extra.session);
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84 if child then
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85 stanza:add_child(child);
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86 end
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87 end
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88 if extra.custom then
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89 for _, child in extra.custom do
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90 if not st.is_stanza(child) then
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91 error("all extra.custom items must be stanzas")
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92 end
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93 stanza:add_child(child);
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94 end
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95 end
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96 end
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97
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98 local id, err = stores[host]:append(nil, nil, stanza, time_now(), user_key);
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99 if err then
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100 module:log("error", "failed to persist audit event: %s", err);
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101 return
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102 else
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103 module:log("debug", "persisted audit event %s as %s", stanza:top_tag(), id);
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104 end
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105 end
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106
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107 function moduleapi.audit(module, user, event_type, extra)
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108 audit(module.host, user, "mod_" .. module:get_name(), event_type, extra);
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109 end