prosody-modules: mod_e2e_policy/mod_e2e

annotate mod_e2e_policy/mod_e2e_policy.lua @ 5243:d5dc8edb2695

mod_http_oauth2: Use more compact IDs UUIDs are nice but so verbose! The reduction in entropy for the nonce should be fine since the timestamp is also counts towards this, and it changes every second (modulo clock shenanigans), so the chances of someone managing to get the same client_secret by registering with the same information at the same time as another entity should be negligible.

author	Kim Alvefur <zash@zash.se>
date	Sat, 11 Mar 2023 22:46:27 +0100
parents	a76c420eca61
children

rev	line source
2212 57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	1 local st = require "util.stanza";
3385 762c7e7ee64b mod_e2e_policy: Verify that the bare JID of stanza to and from is not in the whitelist Michel Le Bihan <michel@lebihan.pl> parents: 3219 diff changeset	2 local jid_bare = require "util.jid".bare;
2212 57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	3 local host = module.host;
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	4 local e2e_policy_chat = module:get_option_string("e2e_policy_chat", "optional"); -- possible values: none, optional and required
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	5 local e2e_policy_muc = module:get_option_string("e2e_policy_muc", "optional"); -- possible values: none, optional and required
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	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
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	7
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	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.");
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	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.");
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	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.");
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	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.");
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	12
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	13 function warn_on_plaintext_messages(event)
2331 611a787e6d08 mod_e2e_policy: Do not reply to error stenzas Michel Le Bihan <michel@lebihan.pl> parents: 2212 diff changeset	14 -- check if JID is whitelisted
3386 a76c420eca61 mod_e2e_policy: Fix an error with getting stanza from event Michel Le Bihan <michel@lebihan.pl> parents: 3385 diff changeset	15 if e2e_policy_whitelist:contains(jid_bare(event.stanza.attr.from)) or e2e_policy_whitelist:contains(jid_bare(event.stanza.attr.to)) then
2212 57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	16 return nil;
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	17 end
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	18 local body = event.stanza:get_child_text("body");
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	19 -- do not warn for status messages
2331 611a787e6d08 mod_e2e_policy: Do not reply to error stenzas Michel Le Bihan <michel@lebihan.pl> parents: 2212 diff changeset	20 if not body or event.stanza.attr.type == "error" then
2212 57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	21 return nil;
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	22 end
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	23 -- check otr
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	24 if body and body:sub(1,4) == "?OTR" then
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	25 return nil;
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	26 end
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	27 -- check omemo https://xmpp.org/extensions/inbox/omemo.html
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	28 if event.stanza:get_child("encrypted", "eu.siacs.conversations.axolotl") or event.stanza:get_child("encrypted", "urn:xmpp:omemo:0") then
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	29 return nil;
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	30 end
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	31 -- check xep27 pgp https://xmpp.org/extensions/xep-0027.html
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	32 if event.stanza:get_child("x", "jabber:x:encrypted") then
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	33 return nil;
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	34 end
2331 611a787e6d08 mod_e2e_policy: Do not reply to error stenzas Michel Le Bihan <michel@lebihan.pl> parents: 2212 diff changeset	35 -- check xep373 pgp (OX) https://xmpp.org/extensions/xep-0373.html
2212 57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	36 if event.stanza:get_child("openpgp", "urn:xmpp:openpgp:0") then
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	37 return nil;
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	38 end
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	39 -- no valid encryption found
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	40 if e2e_policy_chat == "optional" and event.stanza.attr.type ~= "groupchat" then
3219 58d61459cdb1 mod_e2e_policy: Always add the 'to' in warning stanzas Michel Le Bihan <michel@lebihan.pl> parents: 2331 diff changeset	41 event.origin.send(st.message({ from = host, to = event.stanza.attr.from, type = "headline" }, e2e_policy_message_optional_chat));
2212 57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	42 end
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	43 if e2e_policy_chat == "required" and event.stanza.attr.type ~= "groupchat" then
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	44 return event.origin.send(st.error_reply(event.stanza, "modify", "policy-violation", e2e_policy_message_required_chat));
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	45 end
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	46 if e2e_policy_muc == "optional" and event.stanza.attr.type == "groupchat" then
3219 58d61459cdb1 mod_e2e_policy: Always add the 'to' in warning stanzas Michel Le Bihan <michel@lebihan.pl> parents: 2331 diff changeset	47 event.origin.send(st.message({ from = host, to = event.stanza.attr.from, type = "headline" }, e2e_policy_message_optional_muc));
2212 57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	48 end
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	49 if e2e_policy_muc == "required" and event.stanza.attr.type == "groupchat" then
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	50 return event.origin.send(st.error_reply(event.stanza, "modify", "policy-violation", e2e_policy_message_required_muc));
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	51 end
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	52 end
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	53
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	54 module:hook("pre-message/bare", warn_on_plaintext_messages, 300);
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	55 module:hook("pre-message/full", warn_on_plaintext_messages, 300);
57dcad6543c9 mod_e2e_policy: Initial commit Michel Le Bihan <michel@lebihan.pl> parents: diff changeset	56 module:hook("pre-message/host", warn_on_plaintext_messages, 300);

Mercurial > prosody-modules

annotate mod_e2e_policy/mod_e2e_policy.lua @ 5243:d5dc8edb2695