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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2212
57dcad6543c9 mod_e2e_policy: Initial commit
Michel Le Bihan <michel@lebihan.pl>
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1 local st = require "util.stanza";
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2 local host = module.host;
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3 local e2e_policy_chat = module:get_option_string("e2e_policy_chat", "optional"); -- possible values: none, optional and required
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4 local e2e_policy_muc = module:get_option_string("e2e_policy_muc", "optional"); -- possible values: none, optional and required
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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
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6
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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.");
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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.");
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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.");
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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.");
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11
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12 function warn_on_plaintext_messages(event)
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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
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14 return nil;
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15 end
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16 local body = event.stanza:get_child_text("body");
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17 -- do not warn for status messages
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18 if not body then
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19 return nil;
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20 end
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21 -- check otr
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22 if body and body:sub(1,4) == "?OTR" then
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23 return nil;
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24 end
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25 -- check omemo https://xmpp.org/extensions/inbox/omemo.html
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26 if event.stanza:get_child("encrypted", "eu.siacs.conversations.axolotl") or event.stanza:get_child("encrypted", "urn:xmpp:omemo:0") then
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27 return nil;
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28 end
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29 -- check xep27 pgp https://xmpp.org/extensions/xep-0027.html
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30 if event.stanza:get_child("x", "jabber:x:encrypted") then
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31 return nil;
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32 end
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33 -- check xep373 pgp (OX) https://xmpp.org/extensions/xep-0373.html
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34 if event.stanza:get_child("openpgp", "urn:xmpp:openpgp:0") then
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35 return nil;
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36 end
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37 -- no valid encryption found
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38 if e2e_policy_chat == "optional" and event.stanza.attr.type ~= "groupchat" then
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39 event.origin.send(st.message({ from = host, type = "headline" }, e2e_policy_message_optional_chat));
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40 end
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41 if e2e_policy_chat == "required" and event.stanza.attr.type ~= "groupchat" then
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42 return event.origin.send(st.error_reply(event.stanza, "modify", "policy-violation", e2e_policy_message_required_chat));
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43 end
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44 if e2e_policy_muc == "optional" and event.stanza.attr.type == "groupchat" then
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45 event.origin.send(st.message({ from = host, type = "headline" }, e2e_policy_message_optional_muc));
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46 end
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47 if e2e_policy_muc == "required" and event.stanza.attr.type == "groupchat" then
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48 return event.origin.send(st.error_reply(event.stanza, "modify", "policy-violation", e2e_policy_message_required_muc));
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49 end
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50 end
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51
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52 module:hook("pre-message/bare", warn_on_plaintext_messages, 300);
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53 module:hook("pre-message/full", warn_on_plaintext_messages, 300);
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54 module:hook("pre-message/host", warn_on_plaintext_messages, 300);