prosody-modules
d194d1012fd3
mod_anti_spam/mod_anti_spam.lua

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mod_anti_spam/mod_anti_spam.lua @ 5931:d194d1012fd3

Updating dox for mod_rest. Ideas expressed / clarified: 1) Making clear that mod_rest isn't to be installed under VirtualHosts AND as a component. 2) Understanding some of the implications of this choice: A) Changes to user authentication B) How it affects subdomains 3) More consistent use of domain names for clarity. 4) Using different heading sizes to show scope of section. Essentially, I added all the tidbits I had to clarify in getting this to work in my own example.
author Ben Smith <bens@effortlessis.com>
date Mon, 13 May 2024 13:25:13 -0700
parent 5883:259ffdbf8906
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rev   line source
5883
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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 function block_spam(event, reason, action)
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22 event.spam_reason = reason;
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23 event.spam_action = action;
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24 if module:fire_event("spam-blocked", event) == false then
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25 module:log("debug", "Spam allowed by another module");
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26 return;
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27 end
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28
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29 count_spam_blocked:with_labels(reason):add(1);
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30
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31 if action == "bounce" then
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32 module:log("debug", "Bouncing likely spam %s from %s (%s)", event.stanza.name, event.stanza.attr.from, reason);
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33 event.origin.send(st.error_reply("cancel", "policy-violation", "Rejected as spam"));
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34 else
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35 module:log("debug", "Discarding likely spam %s from %s (%s)", event.stanza.name, event.stanza.attr.from, reason);
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36 end
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37
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38 return true;
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39 end
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40
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41 function is_from_stranger(from_jid, event)
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42 local stanza = event.stanza;
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43 local to_user, to_host, to_resource = jid_split(stanza.attr.to);
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44
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45 if not to_user then return false; end
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46
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47 local to_session = full_sessions[stanza.attr.to];
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48 if to_session then return false; end
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49
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50 if not is_contact_subscribed(to_user, to_host, from_jid) then
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51 -- Allow all messages from your own jid
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52 if from_jid == to_user.."@"..to_host then
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53 return false; -- Pass through
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54 end
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55 if to_resource and stanza.attr.type == "groupchat" then
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56 return false; -- Pass through
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57 end
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58 return true; -- Stranger danger
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59 end
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60 end
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61
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62 function is_spammy_server(session)
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63 if spam_source_domains:contains(session.from_host) then
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64 return true;
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65 end
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66 local origin_ip = ip.new(session.ip);
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67 if spam_source_ips:contains_ip(origin_ip) then
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68 return true;
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69 end
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70 end
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71
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72 function is_spammy_sender(sender_jid)
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73 return spam_source_jids:contains(sha256(sender_jid, true));
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74 end
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75
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76 local spammy_strings = module:get_option_array("anti_spam_block_strings");
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77 local spammy_patterns = module:get_option_array("anti_spam_block_patterns");
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78
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79 function is_spammy_content(stanza)
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80 -- Only support message content
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81 if stanza.name ~= "message" then return; end
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82 if not (spammy_strings or spammy_patterns) then return; end
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83
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84 local body = stanza:get_child_text("body");
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85 if spammy_strings then
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86 for _, s in ipairs(spammy_strings) do
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87 if body:find(s, 1, true) then
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88 return true;
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89 end
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90 end
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91 end
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92 if spammy_patterns then
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93 for _, s in ipairs(spammy_patterns) do
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94 if body:find(s) then
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95 return true;
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96 end
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97 end
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98 end
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99 end
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100
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101 -- Set up RTBLs
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102
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103 local anti_spam_services = module:get_option_array("anti_spam_services");
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104
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105 for _, rtbl_service_jid in ipairs(anti_spam_services) do
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106 new_rtbl_subscription(rtbl_service_jid, "spam_source_domains", {
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107 added = function (item)
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108 spam_source_domains:add(item);
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109 end;
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110 removed = function (item)
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111 spam_source_domains:remove(item);
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112 end;
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113 });
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114 new_rtbl_subscription(rtbl_service_jid, "spam_source_ips", {
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115 added = function (item)
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116 spam_source_ips:add_subnet(ip.parse_cidr(item));
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117 end;
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118 removed = function (item)
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119 spam_source_ips:remove_subnet(ip.parse_cidr(item));
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120 end;
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121 });
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122 new_rtbl_subscription(rtbl_service_jid, "spam_source_jids_sha256", {
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123 added = function (item)
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124 spam_source_jids:add(item);
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125 end;
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126 removed = function (item)
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127 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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132 module:hook("message/bare", function (event)
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133 local to_bare = jid_bare(event.stanza.attr.to);
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134
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135 if not user_exists(to_bare) then return; end
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136
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137 local from_bare = jid_bare(event.stanza.attr.from);
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138 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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141 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);