Mercurial > prosody-modules

annotate mod_e2e_policy/mod_e2e_policy.lua @ 4340:7cd3b7ec59e9

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mod_http_oauth2: Rudimentary support for scopes (but not really) We don't support limiting access, but this change will inform the client what permissions the created token has (e.g. is the user an admin or not). There is some work in progress on real scope support.
author Matthew Wild <mwild1@gmail.com>
date Sat, 16 Jan 2021 19:47:22 +0000
parents a76c420eca61
children
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1 local st = require "util.stanza";
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2 local jid_bare = require "util.jid".bare;
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3 local host = module.host;
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4 local e2e_policy_chat = module:get_option_string("e2e_policy_chat", "optional"); -- possible values: none, optional and required
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5 local e2e_policy_muc = module:get_option_string("e2e_policy_muc", "optional"); -- possible values: none, optional and required
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6 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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7
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8 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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9 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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10 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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11 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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13 function warn_on_plaintext_messages(event)
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14 -- check if JID is whitelisted
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15 if e2e_policy_whitelist:contains(jid_bare(event.stanza.attr.from)) or e2e_policy_whitelist:contains(jid_bare(event.stanza.attr.to)) then
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16 return nil;
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17 end
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18 local body = event.stanza:get_child_text("body");
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19 -- do not warn for status messages
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20 if not body or event.stanza.attr.type == "error" then
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21 return nil;
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22 end
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23 -- check otr
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24 if body and body:sub(1,4) == "?OTR" then
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25 return nil;
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26 end
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27 -- check omemo https://xmpp.org/extensions/inbox/omemo.html
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28 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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29 return nil;
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30 end
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31 -- check xep27 pgp https://xmpp.org/extensions/xep-0027.html
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32 if event.stanza:get_child("x", "jabber:x:encrypted") then
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33 return nil;
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34 end
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35 -- check xep373 pgp (OX) https://xmpp.org/extensions/xep-0373.html
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36 if event.stanza:get_child("openpgp", "urn:xmpp:openpgp:0") then
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37 return nil;
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38 end
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39 -- no valid encryption found
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40 if e2e_policy_chat == "optional" and event.stanza.attr.type ~= "groupchat" then
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41 event.origin.send(st.message({ from = host, to = event.stanza.attr.from, type = "headline" }, e2e_policy_message_optional_chat));
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42 end
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43 if e2e_policy_chat == "required" and event.stanza.attr.type ~= "groupchat" then
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44 return event.origin.send(st.error_reply(event.stanza, "modify", "policy-violation", e2e_policy_message_required_chat));
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45 end
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46 if e2e_policy_muc == "optional" and event.stanza.attr.type == "groupchat" then
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47 event.origin.send(st.message({ from = host, to = event.stanza.attr.from, type = "headline" }, e2e_policy_message_optional_muc));
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48 end
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49 if e2e_policy_muc == "required" and event.stanza.attr.type == "groupchat" then
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50 return event.origin.send(st.error_reply(event.stanza, "modify", "policy-violation", e2e_policy_message_required_muc));
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51 end
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52 end
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53
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54 module:hook("pre-message/bare", warn_on_plaintext_messages, 300);
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55 module:hook("pre-message/full", warn_on_plaintext_messages, 300);
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56 module:hook("pre-message/host", warn_on_plaintext_messages, 300);