prosody-modules
57dcad6543c9
mod_e2e_policy/mod_e2e_policy.lua

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mod_e2e_policy/mod_e2e_policy.lua @ 2212:57dcad6543c9

mod_e2e_policy: Initial commit
author Michel Le Bihan <michel@lebihan.pl>
date Tue, 14 Jun 2016 18:03:05 +0200
child 2331:611a787e6d08
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equal deleted inserted replaced
2211:9aecf7c953ba 2212:57dcad6543c9
1 local st = require "util.stanza";
2 local host = module.host;
3 local e2e_policy_chat = module:get_option_string("e2e_policy_chat", "optional"); -- possible values: none, optional and required
4 local e2e_policy_muc = module:get_option_string("e2e_policy_muc", "optional"); -- possible values: none, optional and required
5 local e2e_policy_whitelist = module:get_option_set("e2e_policy_whitelist", { }); -- make this module ignore messages sent to and from this JIDs or MUCs
6
7 local e2e_policy_message_optional_chat = module:get_option_string("e2e_policy_message_optional_chat", "For security reasons, OMEMO, OTR or PGP encryption is STRONGLY recommended for conversations on this server.");
8 local e2e_policy_message_required_chat = module:get_option_string("e2e_policy_message_required_chat", "For security reasons, OMEMO, OTR or PGP encryption is required for conversations on this server.");
9 local e2e_policy_message_optional_muc = module:get_option_string("e2e_policy_message_optional_muc", "For security reasons, OMEMO, OTR or PGP encryption is STRONGLY recommended for MUC on this server.");
10 local e2e_policy_message_required_muc = module:get_option_string("e2e_policy_message_required_muc", "For security reasons, OMEMO, OTR or PGP encryption is required for MUC on this server.");
11
12 function warn_on_plaintext_messages(event)
13 if e2e_policy_whitelist:contains(event.stanza.attr.from) or e2e_policy_whitelist:contains(event.stanza.attr.to) then -- check if JID is whitelisted
14 return nil;
15 end
16 local body = event.stanza:get_child_text("body");
17 -- do not warn for status messages
18 if not body then
19 return nil;
20 end
21 -- check otr
22 if body and body:sub(1,4) == "?OTR" then
23 return nil;
24 end
25 -- check omemo https://xmpp.org/extensions/inbox/omemo.html
26 if event.stanza:get_child("encrypted", "eu.siacs.conversations.axolotl") or event.stanza:get_child("encrypted", "urn:xmpp:omemo:0") then
27 return nil;
28 end
29 -- check xep27 pgp https://xmpp.org/extensions/xep-0027.html
30 if event.stanza:get_child("x", "jabber:x:encrypted") then
31 return nil;
32 end
33 -- check xep373 pgp (OX) https://xmpp.org/extensions/xep-0373.html
34 if event.stanza:get_child("openpgp", "urn:xmpp:openpgp:0") then
35 return nil;
36 end
37 -- no valid encryption found
38 if e2e_policy_chat == "optional" and event.stanza.attr.type ~= "groupchat" then
39 event.origin.send(st.message({ from = host, type = "headline" }, e2e_policy_message_optional_chat));
40 end
41 if e2e_policy_chat == "required" and event.stanza.attr.type ~= "groupchat" then
42 return event.origin.send(st.error_reply(event.stanza, "modify", "policy-violation", e2e_policy_message_required_chat));
43 end
44 if e2e_policy_muc == "optional" and event.stanza.attr.type == "groupchat" then
45 event.origin.send(st.message({ from = host, type = "headline" }, e2e_policy_message_optional_muc));
46 end
47 if e2e_policy_muc == "required" and event.stanza.attr.type == "groupchat" then
48 return event.origin.send(st.error_reply(event.stanza, "modify", "policy-violation", e2e_policy_message_required_muc));
49 end
50 end
51
52 module:hook("pre-message/bare", warn_on_plaintext_messages, 300);
53 module:hook("pre-message/full", warn_on_plaintext_messages, 300);
54 module:hook("pre-message/host", warn_on_plaintext_messages, 300);