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annotate mod_e2e_policy/mod_e2e_policy.lua @ 2782:8fd37f0e108c

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mod_firewall: Don't interpret format specifiers in LOG May include untrusted input (e.g. $(stanza)), and there is no legitimate way to provide additional parameters anyway.
author Matthew Wild <mwild1@gmail.com>
date Wed, 04 Oct 2017 10:54:52 +0100
parents 611a787e6d08
children 58d61459cdb1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 -- check if JID is whitelisted
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14 if e2e_policy_whitelist:contains(event.stanza.attr.from) or e2e_policy_whitelist:contains(event.stanza.attr.to) then
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15 return nil;
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16 end
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17 local body = event.stanza:get_child_text("body");
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18 -- do not warn for status messages
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19 if not body or event.stanza.attr.type == "error" then
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20 return nil;
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21 end
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22 -- check otr
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23 if body and body:sub(1,4) == "?OTR" then
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24 return nil;
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25 end
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26 -- check omemo https://xmpp.org/extensions/inbox/omemo.html
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27 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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28 return nil;
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29 end
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30 -- check xep27 pgp https://xmpp.org/extensions/xep-0027.html
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31 if event.stanza:get_child("x", "jabber:x:encrypted") then
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32 return nil;
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33 end
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34 -- check xep373 pgp (OX) https://xmpp.org/extensions/xep-0373.html
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35 if event.stanza:get_child("openpgp", "urn:xmpp:openpgp:0") then
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36 return nil;
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37 end
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38 -- no valid encryption found
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39 if e2e_policy_chat == "optional" and event.stanza.attr.type ~= "groupchat" then
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40 event.origin.send(st.message({ from = host, type = "headline" }, e2e_policy_message_optional_chat));
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41 end
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42 if e2e_policy_chat == "required" and event.stanza.attr.type ~= "groupchat" then
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43 return event.origin.send(st.error_reply(event.stanza, "modify", "policy-violation", e2e_policy_message_required_chat));
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44 end
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45 if e2e_policy_muc == "optional" and event.stanza.attr.type == "groupchat" then
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46 event.origin.send(st.message({ from = host, type = "headline" }, e2e_policy_message_optional_muc));
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47 end
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48 if e2e_policy_muc == "required" and event.stanza.attr.type == "groupchat" then
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49 return event.origin.send(st.error_reply(event.stanza, "modify", "policy-violation", e2e_policy_message_required_muc));
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50 end
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51 end
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52
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53 module:hook("pre-message/bare", warn_on_plaintext_messages, 300);
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54 module:hook("pre-message/full", warn_on_plaintext_messages, 300);
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55 module:hook("pre-message/host", warn_on_plaintext_messages, 300);