Mercurial > prosody-modules

annotate mod_e2e_policy/mod_e2e_policy.lua @ 5256:44f7edd4f845

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mod_http_oauth2: Reject non-local hosts in more code paths We're not issuing tokens for users on remote hosts, we can't even authenticate them since they're remote. Thus the host is always the local module.host so no need to pass around the host in most cases or use it for anything but enforcing the same host.
author Kim Alvefur <zash@zash.se>
date Thu, 16 Mar 2023 17:52:10 +0100
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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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);