author | Kim Alvefur <zash@zash.se> |
Wed, 13 Mar 2024 23:45:25 +0100 | |
changeset 5872 | bdcb61275afe |
parent 5863 | 259ffdbf8906 |
permissions | -rw-r--r-- |
5863
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1 |
local ip = require "util.ip"; |
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local jid_bare = require "util.jid".bare; |
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local jid_split = require "util.jid".split; |
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local set = require "util.set"; |
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local sha256 = require "util.hashes".sha256; |
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local st = require"util.stanza"; |
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local is_contact_subscribed = require "core.rostermanager".is_contact_subscribed; |
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local full_sessions = prosody.full_sessions; |
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local user_exists = require "core.usermanager".user_exists; |
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local new_rtbl_subscription = module:require("rtbl").new_rtbl_subscription; |
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local trie = module:require("trie"); |
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local spam_source_domains = set.new(); |
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local spam_source_ips = trie.new(); |
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local spam_source_jids = set.new(); |
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local count_spam_blocked = module:metric("counter", "anti_spam_blocked", "stanzas", "Stanzas blocked as spam", {"reason"}); |
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function block_spam(event, reason, action) |
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event.spam_reason = reason; |
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event.spam_action = action; |
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if module:fire_event("spam-blocked", event) == false then |
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module:log("debug", "Spam allowed by another module"); |
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return; |
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end |
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count_spam_blocked:with_labels(reason):add(1); |
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|
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if action == "bounce" then |
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module:log("debug", "Bouncing likely spam %s from %s (%s)", event.stanza.name, event.stanza.attr.from, reason); |
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event.origin.send(st.error_reply("cancel", "policy-violation", "Rejected as spam")); |
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else |
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module:log("debug", "Discarding likely spam %s from %s (%s)", event.stanza.name, event.stanza.attr.from, reason); |
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end |
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return true; |
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end |
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function is_from_stranger(from_jid, event) |
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local stanza = event.stanza; |
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local to_user, to_host, to_resource = jid_split(stanza.attr.to); |
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if not to_user then return false; end |
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local to_session = full_sessions[stanza.attr.to]; |
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if to_session then return false; end |
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if not is_contact_subscribed(to_user, to_host, from_jid) then |
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-- Allow all messages from your own jid |
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if from_jid == to_user.."@"..to_host then |
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return false; -- Pass through |
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end |
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if to_resource and stanza.attr.type == "groupchat" then |
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return false; -- Pass through |
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end |
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return true; -- Stranger danger |
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end |
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end |
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function is_spammy_server(session) |
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if spam_source_domains:contains(session.from_host) then |
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return true; |
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end |
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local origin_ip = ip.new(session.ip); |
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if spam_source_ips:contains_ip(origin_ip) then |
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return true; |
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end |
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end |
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function is_spammy_sender(sender_jid) |
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return spam_source_jids:contains(sha256(sender_jid, true)); |
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end |
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local spammy_strings = module:get_option_array("anti_spam_block_strings"); |
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local spammy_patterns = module:get_option_array("anti_spam_block_patterns"); |
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|
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function is_spammy_content(stanza) |
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-- Only support message content |
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if stanza.name ~= "message" then return; end |
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if not (spammy_strings or spammy_patterns) then return; end |
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|
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local body = stanza:get_child_text("body"); |
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if spammy_strings then |
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for _, s in ipairs(spammy_strings) do |
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if body:find(s, 1, true) then |
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return true; |
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end |
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end |
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end |
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if spammy_patterns then |
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for _, s in ipairs(spammy_patterns) do |
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if body:find(s) then |
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return true; |
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end |
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end |
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end |
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end |
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|
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-- Set up RTBLs |
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|
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local anti_spam_services = module:get_option_array("anti_spam_services"); |
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for _, rtbl_service_jid in ipairs(anti_spam_services) do |
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new_rtbl_subscription(rtbl_service_jid, "spam_source_domains", { |
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added = function (item) |
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spam_source_domains:add(item); |
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109 |
end; |
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removed = function (item) |
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spam_source_domains:remove(item); |
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end; |
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}); |
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new_rtbl_subscription(rtbl_service_jid, "spam_source_ips", { |
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added = function (item) |
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spam_source_ips:add_subnet(ip.parse_cidr(item)); |
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end; |
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removed = function (item) |
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spam_source_ips:remove_subnet(ip.parse_cidr(item)); |
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end; |
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}); |
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new_rtbl_subscription(rtbl_service_jid, "spam_source_jids_sha256", { |
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added = function (item) |
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spam_source_jids:add(item); |
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end; |
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removed = function (item) |
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spam_source_jids:remove(item); |
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128 |
end; |
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129 |
}); |
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130 |
end |
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131 |
|
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module:hook("message/bare", function (event) |
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local to_bare = jid_bare(event.stanza.attr.to); |
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134 |
|
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if not user_exists(to_bare) then return; end |
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136 |
|
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local from_bare = jid_bare(event.stanza.attr.from); |
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if not is_from_stranger(from_bare, event) then return; end |
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139 |
|
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140 |
if is_spammy_server(event.origin) then |
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return block_spam(event, "known-spam-source", "drop"); |
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142 |
end |
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143 |
|
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144 |
if is_spammy_sender(from_bare) then |
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145 |
return block_spam(event, "known-spam-jid", "drop"); |
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146 |
end |
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147 |
|
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148 |
if is_spammy_content(event.stanza) then |
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149 |
return block_spam(event, "spam-content", "drop"); |
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150 |
end |
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151 |
end, 500); |
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152 |
|
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153 |
module:hook("presence/bare", function (event) |
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154 |
if event.stanza.type ~= "subscribe" then |
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155 |
return; |
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156 |
end |
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157 |
|
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158 |
if is_spammy_server(event.origin) then |
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159 |
return block_spam(event, "known-spam-source", "drop"); |
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160 |
end |
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161 |
|
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162 |
if is_spammy_sender(event.stanza) then |
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163 |
return block_spam(event, "known-spam-jid", "drop"); |
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164 |
end |
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165 |
end, 500); |