prosody-modules
530d116b7f68
mod_audit/mod_audit.lua

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mod_audit/mod_audit.lua @ 4932:530d116b7f68

mod_audit*: modules for audit logging in prosody These are to be seen as proof-of-concept for now.
author Jonas Schäfer <jonas@wielicki.name>
date Tue, 26 Apr 2022 22:32:44 +0200
child 4933:08dea42a302a
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4932
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1 module:set_global();
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2
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3 local time_now = os.time;
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4 local st = require "util.stanza";
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5
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6 local host_wide_user = "@";
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7
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8 local stores = {};
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9
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10 local function get_store(self, host)
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11 local store = rawget(self, host);
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12 if store then
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13 return store
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14 end
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15 local store = module:context(host):open_store("audit", "archive");
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16 rawset(self, host, store);
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17 return store;
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18 end
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19
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20 setmetatable(stores, { __index = get_store });
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21
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22
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23 local function session_extra(session)
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24 local attr = {
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25 xmlns = "xmpp:prosody.im/audit",
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26 };
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27 if session.id then
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28 attr.id = session.id;
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29 end
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30 if session.type then
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31 attr.type = session.type;
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32 end
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33 local stanza = st.stanza("session", attr);
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34 if session.ip then
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35 stanza:text_tag("remote-ip", session.ip);
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36 end
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37 return stanza
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38 end
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39
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40 local function audit(host, user, source, event_type, extra)
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41 if not host or host == "*" then
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42 error("cannot log audit events for global");
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43 end
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44 local user = user or host_wide_user;
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45
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46 local attr = {
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47 ["source"] = source,
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48 ["type"] = event_type,
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49 };
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50 if user ~= host_wide_user then
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51 attr.user = user;
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52 end
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53 local stanza = st.stanza("audit-event", attr);
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54 if extra ~= nil then
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55 if extra.session then
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56 local child = session_extra(extra.session);
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57 if child then
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58 stanza:add_child(child);
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59 end
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60 end
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61 if extra.custom then
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62 for _, child in extra.custom do
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63 if not st.is_stanza(child) then
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64 error("all extra.custom items must be stanzas")
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65 end
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66 stanza:add_child(child);
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67 end
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68 end
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69 end
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70
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71 local id, err = stores[host]:append(nil, nil, stanza, time_now(), user);
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72 if err then
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73 module:log("error", "failed to persist audit event: %s", err);
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74 return
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75 else
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76 module:log("debug", "persisted audit event %s as %s", stanza:top_tag(), id);
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77 end
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78 end
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79
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80 local module_api = getmetatable(module).__index;
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81
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82 function module_api:audit(user, event_type, extra)
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83 audit(self.host, user, "mod_" .. self:get_name(), event_type, extra);
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84 end
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85
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86 module:hook("audit", audit, 0);