prosody-modules
c90aab23fb9b
mod_anti_spam/mod_anti_spam.lua

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mod_anti_spam/mod_anti_spam.lua @ 6148:c90aab23fb9b

mod_persisthosts: Also skip defined Components (thanks gtech1) Thought Components also had `defined=true`, but apparently not.
author Kim Alvefur <zash@zash.se>
date Sat, 11 Jan 2025 12:12:18 +0100
parent 6134:00b55c7ef393
child 6152:5961e01dd963
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1 local ip = require "util.ip";
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2 local jid_bare = require "util.jid".bare;
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3 local jid_split = require "util.jid".split;
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4 local set = require "util.set";
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5 local sha256 = require "util.hashes".sha256;
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6 local st = require"util.stanza";
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7 local is_contact_subscribed = require "core.rostermanager".is_contact_subscribed;
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8 local full_sessions = prosody.full_sessions;
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9
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10 local user_exists = require "core.usermanager".user_exists;
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11
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12 local new_rtbl_subscription = module:require("rtbl").new_rtbl_subscription;
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13 local trie = module:require("trie");
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14
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15 local spam_source_domains = set.new();
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16 local spam_source_ips = trie.new();
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17 local spam_source_jids = set.new();
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18
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19 local count_spam_blocked = module:metric("counter", "anti_spam_blocked", "stanzas", "Stanzas blocked as spam", {"reason"});
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20
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21 local hosts = prosody.hosts;
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22
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23 local reason_messages = {
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24 default = "Rejected as spam";
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25 ["known-spam-source"] = "Rejected as spam. Your server is listed as a known source of spam. Please contact your server operator.";
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26 };
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27
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28 function block_spam(event, reason, action)
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29 event.spam_reason = reason;
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30 event.spam_action = action;
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31 if module:fire_event("spam-blocked", event) == false then
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32 module:log("debug", "Spam allowed by another module");
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33 return;
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34 end
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35
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36 count_spam_blocked:with_labels(reason):add(1);
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37
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38 if action == "bounce" then
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39 module:log("debug", "Bouncing likely spam %s from %s (%s)", event.stanza.name, event.stanza.attr.from, reason);
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40 event.origin.send(st.error_reply("cancel", "policy-violation", reason_messages[reason] or reason_messages.default));
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41 else
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42 module:log("debug", "Discarding likely spam %s from %s (%s)", event.stanza.name, event.stanza.attr.from, reason);
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43 end
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44
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45 return true;
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46 end
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47
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48 function is_from_stranger(from_jid, event)
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49 local stanza = event.stanza;
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50 local to_user, to_host, to_resource = jid_split(stanza.attr.to);
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51
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52 if not to_user then return false; end
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53
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54 local to_session = full_sessions[stanza.attr.to];
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55 if to_session then return false; end
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56
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57 if not is_contact_subscribed(to_user, to_host, from_jid) then
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58 -- Allow all messages from your own jid
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59 if from_jid == to_user.."@"..to_host then
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60 return false; -- Pass through
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61 end
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62 if to_resource and stanza.attr.type == "groupchat" then
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63 return false; -- Pass through
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64 end
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65 return true; -- Stranger danger
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66 end
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67 end
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68
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69 function is_spammy_server(session)
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70 if spam_source_domains:contains(session.from_host) then
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71 return true;
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72 end
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73 local raw_ip = session.ip;
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74 local parsed_ip = raw_ip and ip.new_ip(session.ip);
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75 -- Not every session has an ip - for example, stanzas sent from a
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76 -- local host session
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77 if parsed_ip and spam_source_ips:contains_ip(parsed_ip) then
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78 return true;
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79 end
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80 end
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81
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82 function is_spammy_sender(sender_jid)
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83 return spam_source_jids:contains(sha256(sender_jid, true));
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84 end
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85
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86 local spammy_strings = module:get_option_array("anti_spam_block_strings");
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87 local spammy_patterns = module:get_option_array("anti_spam_block_patterns");
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88
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89 function is_spammy_content(stanza)
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90 -- Only support message content
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91 if stanza.name ~= "message" then return; end
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92 if not (spammy_strings or spammy_patterns) then return; end
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93
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94 local body = stanza:get_child_text("body");
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95 if not body then return; end
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96
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97 if spammy_strings then
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98 for _, s in ipairs(spammy_strings) do
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99 if body:find(s, 1, true) then
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100 return true;
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101 end
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102 end
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103 end
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104 if spammy_patterns then
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105 for _, s in ipairs(spammy_patterns) do
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106 if body:find(s) then
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107 return true;
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108 end
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109 end
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110 end
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111 end
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112
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113 -- Set up RTBLs
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114
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115 local anti_spam_services = module:get_option_array("anti_spam_services", {});
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116
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117 for _, rtbl_service_jid in ipairs(anti_spam_services) do
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118 new_rtbl_subscription(rtbl_service_jid, "spam_source_domains", {
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119 added = function (item)
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120 spam_source_domains:add(item);
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121 end;
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122 removed = function (item)
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123 spam_source_domains:remove(item);
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124 end;
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125 });
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126 new_rtbl_subscription(rtbl_service_jid, "spam_source_ips", {
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127 added = function (item)
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128 local subnet_ip, subnet_bits = ip.parse_cidr(item);
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129 if not subnet_ip then
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130 return;
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131 end
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132 spam_source_ips:add_subnet(subnet_ip, subnet_bits);
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133 end;
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134 removed = function (item)
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135 local subnet_ip, subnet_bits = ip.parse_cidr(item);
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136 if not subnet_ip then
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137 return;
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138 end
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139 spam_source_ips:remove_subnet(subnet_ip, subnet_bits);
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140 end;
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141 });
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142 new_rtbl_subscription(rtbl_service_jid, "spam_source_jids_sha256", {
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143 added = function (item)
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144 spam_source_jids:add(item);
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145 end;
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146 removed = function (item)
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147 spam_source_jids:remove(item);
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148 end;
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149 });
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150 end
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151
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152 module:hook("message/bare", function (event)
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153 local to_user, to_host = jid_split(event.stanza.attr.to);
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154
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155 if not hosts[to_host] then
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156 module:log("warn", "Skipping filtering of message to unknown host <%s>", to_host);
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157 return;
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158 end
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159
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160 if not user_exists(to_user, to_host) then return; end
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161
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162 local from_bare = jid_bare(event.stanza.attr.from);
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163 if not is_from_stranger(from_bare, event) then return; end
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164
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165 module:log("debug", "Processing message from stranger...");
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166
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167 if is_spammy_server(event.origin) then
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168 return block_spam(event, "known-spam-source", "drop");
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169 end
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170
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171 if is_spammy_sender(from_bare) then
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172 return block_spam(event, "known-spam-jid", "drop");
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173 end
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174
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175 if is_spammy_content(event.stanza) then
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176 return block_spam(event, "spam-content", "drop");
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177 end
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178
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179 module:log("debug", "Allowing message through");
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180 end, 500);
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181
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182 module:hook("presence/bare", function (event)
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183 if event.stanza.attr.type ~= "subscribe" then
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184 return;
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185 end
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186
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187 module:log("debug", "Processing subscription request...");
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188
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189 if is_spammy_server(event.origin) then
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190 return block_spam(event, "known-spam-source", "drop");
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191 end
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192
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193 module:log("debug", "Not from known spam source server");
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194
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195 if is_spammy_sender(jid_bare(event.stanza.attr.from)) then
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196 return block_spam(event, "known-spam-jid", "drop");
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197 end
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198
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199 module:log("debug", "Not from known spam source JID");
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200
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201 module:log("debug", "Allowing subscription request through");
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202 end, 500);