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annotate mod_isolate_host/mod_isolate_host.lua @ 5326:dc058fcc3fe3

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mod_audit: Improve filtering options and add documentation to README
author Matthew Wild <mwild1@gmail.com>
date Fri, 07 Apr 2023 13:44:18 +0100
parents 4bba2d27ffaf
children 25e20fa3824c
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1 local jid = require "util.jid";
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2 local jid_bare, jid_host = jid.bare, jid.host;
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3 local set = require "util.set";
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4 local st = require "util.stanza";
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5
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6 local stanza_types = set.new{"message", "presence", "iq"};
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7 local jid_types = set.new{"bare", "full", "host"};
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8
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9 local except_domains = module:get_option_inherited_set("isolate_except_domains", {});
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10 local except_users = module:get_option_inherited_set("isolate_except_users", {});
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11
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12 if not module.may then
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13 module:depends("compat_roles");
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14 end
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15
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16 function check_stanza(event)
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17 local origin, stanza = event.origin, event.stanza;
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18 if origin.no_host_isolation then return; end
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19 local to_host = jid_host(event.stanza.attr.to);
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20 if to_host and to_host ~= origin.host and not except_domains:contains(to_host) then
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21 if to_host:match("^[^.]+%.(.+)$") == origin.host then -- Permit subdomains
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22 except_domains:add(to_host);
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23 return;
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24 end
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25 if origin.type == "local" then
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26 -- this is code-generated, which means that set_session_isolation_flag has never triggered.
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27 -- we need to check explicitly.
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28 if not is_jid_isolated(jid_bare(event.stanza.attr.from)) then
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29 module:log("debug", "server-generated stanza from %s is allowed, as the jid is not isolated", event.stanza.attr.from);
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30 return;
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31 end
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32 end
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33 module:log("warn", "Forbidding stanza from %s to %s", stanza.attr.from or origin.full_jid, stanza.attr.to);
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34 origin.send(st.error_reply(stanza, "auth", "forbidden", "Communication with "..to_host.." is not available"));
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35 return true;
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36 end
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37 end
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38
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39 for stanza_type in stanza_types do
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40 for jid_type in jid_types do
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41 module:hook("pre-"..stanza_type.."/"..jid_type, check_stanza, 1);
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42 end
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43 end
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44
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45 module:default_permission("prosody:admin", "xmpp:federate");
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46
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47 function is_jid_isolated(bare_jid)
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48 if except_users:contains(bare_jid) or module:may("xmpp:federate", bare_jid) then
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49 return false;
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50 else
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51 return true;
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52 end
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53 end
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54
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55 function set_session_isolation_flag(event)
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56 local session = event.session;
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57 local bare_jid = jid_bare(session.full_jid);
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58 if not is_jid_isolated(bare_jid) then
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59 session.no_host_isolation = true;
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60 end
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61 module:log("debug", "%s is %sisolated", session.full_jid or "[?]", session.no_host_isolation and "" or "not ");
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62 end
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63
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64 module:hook("resource-bind", set_session_isolation_flag);