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annotate mod_isolate_host/mod_isolate_host.lua @ 5593:6d0574bfbf5d

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mod_client_management: Include software version in table (when known) Showing software versions could be useful for statistical reasons, e.g. determining how quickly (or not) users upgrade, but most importantly for revoking vulnerable clients versions in case of a security issue.
author Kim Alvefur <zash@zash.se>
date Thu, 13 Jul 2023 23:26:02 +0200
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);