Mercurial > prosody-modules

annotate mod_e2e_policy/mod_e2e_policy.lua @ 5401:c8d04ac200fc

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mod_http_oauth2: Reject loopback URIs as client_uri This really should be a proper website with info, https://localhost is not good enough. Ideally we'd validate that it's got proper DNS and is actually reachable, but triggering HTTP or even DNS lookups seems like it would carry abuse potential that would best to avoid.
author Kim Alvefur <zash@zash.se>
date Tue, 02 May 2023 16:20:55 +0200
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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a76c420eca61 mod_e2e_policy: Fix an error with getting stanza from event
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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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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);