Mercurial > prosody-modules

annotate mod_dnsbl/mod_dnsbl.lua @ 6517:3d14a407307d

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mod_muc_restrict_attention: Add default option for participants. Breaking change config option name.
author Menel <menel@snikket.de>
date Thu, 16 Apr 2026 12:02:18 +0200
parents f61564e11d3b
children
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rev   line source
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1 local lfs = require "lfs";
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2
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3 local adns = require "net.adns";
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4 local async = require "util.async";
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5 local it = require "util.iterators";
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6 local hex = require "util.hex";
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7 local parse_cidr = require "util.ip".parse_cidr;
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8 local parse_ip = require "util.ip".new_ip;
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9 local promise = require "util.promise";
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10 local set = require "util.set";
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11 local st = require "util.stanza";
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12
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13 local render_message = require "util.interpolation".new("%b{}", function (s)
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14 return s;
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15 end);
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16
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17 local trie = module:require("mod_anti_spam/trie");
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18
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19 local dnsbls_config_raw = module:get_option("dnsbls");
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20 local default_dnsbl_flag = module:get_option_string("dnsbl_flag", "dnsbl_hit");
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21 local default_dnsbl_message = module:get_option("dnsbl_message");
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22
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23 if not dnsbls_config_raw then
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24 module:log_status("error", "No 'dnsbls' in config file");
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25 return;
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26 end
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27
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28 local is_host_anonymous = module:get_option_string("authentication") == "anonymous";
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29
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30 local dnsbls = set.new();
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31 local dnsbls_config = {};
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32
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33 for k, v in ipairs(dnsbls_config_raw) do
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34 local dnsbl_name, dnsbl_config;
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35 if type(k) == "string" then
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36 dnsbl_name = k;
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37 dnsbl_config = v;
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38 else
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39 dnsbl_name = v;
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40 dnsbl_config = {};
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41 end
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42 dnsbls:add(dnsbl_name);
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43 dnsbls_config[dnsbl_name] = dnsbl_config;
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44 end
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45
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46 local function read_dnsbl_file(filename)
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47 local t = trie.new();
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48 local f, err = io.open(filename);
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49 if not f then
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50 module:log("error", "Failed to read file: %s", err);
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51 return t;
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52 end
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53
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54 local n_line, n_added = 0, 0;
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55 for rawline in f:lines() do
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56 n_line = n_line + 1;
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57 local line = rawline:gsub("#.+$", ""):match("^%s*(.-)%s*$");
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58 if line == "" then -- luacheck: ignore 542
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59 -- Skip
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60 else
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61 local parsed_ip, parsed_bits = parse_cidr(line);
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62 if not parsed_ip then
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63 -- Skip
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64 module:log("warn", "Failed to parse IP/CIDR on %s:%d", filename, n_line);
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65 else
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66 if not parsed_bits then
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67 -- Default to full length of IP address
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68 parsed_bits = #parsed_ip.packed * 8;
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69 end
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70 t:add_subnet(parsed_ip, parsed_bits);
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71 n_added = n_added + 1;
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72 end
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73 end
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74 end
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75
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76 module:log("info", "Loaded %d entries from %s", n_added, filename);
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77
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78 return t;
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79 end
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80
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81 local ipsets = {};
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82 local ipsets_last_updated = {};
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83
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84 function reload_file_dnsbls()
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85 for dnsbl in dnsbls do
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86 if dnsbl:byte(1) == 64 then -- '@'
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87 local filename = dnsbl:sub(2);
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88 local file_last_updated = lfs.attributes(filename, "change");
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89 if (ipsets_last_updated[dnsbl] or 0) < file_last_updated then
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90 ipsets[dnsbl] = read_dnsbl_file(filename);
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91 ipsets_last_updated[dnsbl] = file_last_updated;
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92 end
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93 end
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94 end
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95 end
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96
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97 module:hook_global("config-reloaded", reload_file_dnsbls);
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98 reload_file_dnsbls();
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99
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100 local mod_flags = module:depends("flags");
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101
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102 local function reverse(ip, suffix)
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103 if ip.proto == "IPv4" then
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104 local query_string = ip.packed;
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105 local a, b, c, d = query_string:byte(1, 4);
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106 return ("%d.%d.%d.%d.%s"):format(d, c, b, a, suffix);
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107 elseif ip.proto == "IPv6" then
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108 return hex.encode(ip.packed):reverse():gsub("%x", "%1.")..suffix;
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109 end
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110 end
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111
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112 function check_dnsbl(ip_address, dnsbl, callback, ud)
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113 if dnsbl:byte(1) == 64 then -- '@'
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114 local parsed_ip = parse_ip(ip_address);
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115 if not parsed_ip then
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116 module:log("warn", "Failed to parse IP address: %s", ip_address);
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117 callback(ud, false, dnsbl);
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118 return;
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119 end
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120 callback(ud, not not ipsets[dnsbl]:contains_ip(parsed_ip), dnsbl);
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121 return;
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122 else
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123 if ip_address:sub(1,7):lower() == "::ffff:" then
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124 ip_address = ip_address:sub(8);
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125 end
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126
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127 local parsed_ip = parse_ip(ip_address);
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128
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129 local rbl_ip = reverse(parsed_ip, dnsbl);
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130 if not rbl_ip then
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131 module:log("warn", "Unable to query dnsbls for invalid IP: %s", parsed_ip.proto);
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132 return;
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133 end
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134
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135 module:log("debug", "Sending DNSBL lookup for %s", ip_address);
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136 adns.lookup(function (reply)
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parents:
diff changeset
137 local hit = not not (reply and reply[1]);
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
138 module:log("debug", "Received DNSBL result for %s: %s", ip_address, hit and "present" or "absent");
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
139 callback(ud, hit, dnsbl);
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
140 end, rbl_ip);
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
141 end
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
142 end
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
143
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
144 local function handle_dnsbl_register_result(registration_event, hit, dnsbl)
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parents:
diff changeset
145 if not hit then return; end
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
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parents:
diff changeset
146
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
147 if registration_event.dnsbl_match then return; end
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parents:
diff changeset
148 registration_event.dnsbl_match = true;
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parents:
diff changeset
149
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
150 local username = registration_event.username;
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parents:
diff changeset
151 local flag = dnsbls_config[dnsbl].flag or default_dnsbl_flag;
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parents:
diff changeset
152
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diff changeset
153 module:log("info", "Flagging %s for user %s registered from %s matching %s", flag, username, registration_event.ip, dnsbl);
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parents:
diff changeset
154
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diff changeset
155 mod_flags:add_flag(username, flag, "Matched "..dnsbl);
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parents:
diff changeset
156
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diff changeset
157 local msg = dnsbls_config[dnsbl].message or default_dnsbl_message;
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diff changeset
158
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diff changeset
159 if msg then
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diff changeset
160 module:log("debug", "Sending warning message to %s", username);
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parents:
diff changeset
161 local msg_stanza = st.message(
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parents:
diff changeset
162 {
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diff changeset
163 to = username.."@"..module.host;
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parents:
diff changeset
164 from = module.host;
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parents:
diff changeset
165 },
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parents:
diff changeset
166 render_message(msg, { registration = registration_event })
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
167 );
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parents:
diff changeset
168 module:send(msg_stanza);
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
169 end
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
170 end
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
171
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parents:
diff changeset
172 module:hook("user-registered", function (event)
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parents:
diff changeset
173 local session = event.session;
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
174 local ip = event.ip or (session and session.ip);
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parents:
diff changeset
175 if not ip then return; end
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parents:
diff changeset
176
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parents:
diff changeset
177 if not event.ip then
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parents:
diff changeset
178 event.ip = ip;
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parents:
diff changeset
179 end
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parents:
diff changeset
180
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parents:
diff changeset
181 for dnsbl in dnsbls do
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diff changeset
182 check_dnsbl(ip, dnsbl, handle_dnsbl_register_result, event);
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parents:
diff changeset
183 end
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
184 end);
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
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diff changeset
185
6499
1213145e27fc mod_dnsbl: Support for anonymous hosts
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parents: 6493
diff changeset
186 if is_host_anonymous then
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diff changeset
187 module:hook("resource-bind", function (event)
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diff changeset
188 local session = event.session;
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diff changeset
189 local username, ip = session.username, session.ip;
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diff changeset
190 if not ip then return; end
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diff changeset
191
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diff changeset
192 local queries = {};
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diff changeset
193 for dnsbl in dnsbls do
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parents: 6493
diff changeset
194 queries[dnsbl] = promise.new(function (resolve)
1213145e27fc mod_dnsbl: Support for anonymous hosts
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parents: 6493
diff changeset
195 check_dnsbl(ip, dnsbl, function (_, hit)
1213145e27fc mod_dnsbl: Support for anonymous hosts
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parents: 6493
diff changeset
196 resolve(hit);
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parents: 6493
diff changeset
197 end);
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parents: 6493
diff changeset
198 end);
1213145e27fc mod_dnsbl: Support for anonymous hosts
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parents: 6493
diff changeset
199 end
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parents: 6493
diff changeset
200 local results, err = async.wait_for(promise.all_settled(queries));
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parents: 6493
diff changeset
201 if not results then
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parents: 6493
diff changeset
202 module:log("warn", "Failed to query dnsbls: %s", err);
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parents: 6493
diff changeset
203 return;
1213145e27fc mod_dnsbl: Support for anonymous hosts
Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
204 end
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Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
205 local any_match, any_error;
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Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
206 for dnsbl, result in pairs(results) do
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parents: 6493
diff changeset
207 if result.status == "fulfilled" and result.value == true then
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parents: 6493
diff changeset
208 local flag = dnsbls_config[dnsbl].flag or default_dnsbl_flag;
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parents: 6493
diff changeset
209 module:log("info", "Flagging %s for anonymous user %s connecting from %s matching %s", flag, username, ip, dnsbl);
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parents: 6493
diff changeset
210 mod_flags:add_flag(username, flag, "Matched "..dnsbl);
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Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
211 any_match = true;
1213145e27fc mod_dnsbl: Support for anonymous hosts
Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
212 elseif result.status == "rejected" then
1213145e27fc mod_dnsbl: Support for anonymous hosts
Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
213 any_error = true;
1213145e27fc mod_dnsbl: Support for anonymous hosts
Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
214 end
1213145e27fc mod_dnsbl: Support for anonymous hosts
Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
215 end
1213145e27fc mod_dnsbl: Support for anonymous hosts
Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
216 if not any_match then
1213145e27fc mod_dnsbl: Support for anonymous hosts
Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
217 if not any_error then
1213145e27fc mod_dnsbl: Support for anonymous hosts
Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
218 module:log("debug", "DNSBLs all clear for this IP address");
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Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
219 else
1213145e27fc mod_dnsbl: Support for anonymous hosts
Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
220 module:log("debug", "Errors were encountered while querying DNSBLs");
1213145e27fc mod_dnsbl: Support for anonymous hosts
Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
221 end
1213145e27fc mod_dnsbl: Support for anonymous hosts
Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
222 end
1213145e27fc mod_dnsbl: Support for anonymous hosts
Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
223 end);
1213145e27fc mod_dnsbl: Support for anonymous hosts
Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
224 end
1213145e27fc mod_dnsbl: Support for anonymous hosts
Matthew Wild <mwild1@gmail.com>
parents: 6493
diff changeset
225
6133
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
226 module:add_item("account-trait", {
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
227 name = "register-dnsbl-hit";
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
228 prob_bad_true = 0.6;
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
229 prob_bad_false = 0.4;
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
230 });
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
231
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
232 module:hook("get-account-traits", function (event)
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
233 event.traits["register-dnsbl-hit"] = mod_flags.has_flag(event.username, default_dnsbl_flag);
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
234 end);
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
235
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
236 module:add_item("shell-command", {
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
237 section = "dnsbl";
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
238 section_desc = "Manage DNS blocklists";
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
239 name = "lists";
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
240 desc = "Show all lists currently in use on the specified host";
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
241 args = {
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
242 { name = "host", type = "string" };
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
243 };
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
244 host_selector = "host";
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
245 handler = function(self, host) --luacheck: ignore 212/self 212/host
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
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parents:
diff changeset
246 local count = 0;
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
247 for list in dnsbls do
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
248 count = count + 1;
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
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parents:
diff changeset
249 self.session.print(list);
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
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parents:
diff changeset
250 end
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
251 return true, ("%d lists"):format(count);
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
252 end;
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
253 });
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
254
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
255 module:add_item("shell-command", {
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
256 section = "dnsbl";
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
257 section_desc = "Manage DNS blocklists";
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
258 name = "check";
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
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parents:
diff changeset
259 desc = "Check an IP against the configured block lists";
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
260 args = {
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
261 { name = "host", type = "string" };
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
262 { name = "ip_address", type = "string" };
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
263 };
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
264 host_selector = "host";
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
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parents:
diff changeset
265 handler = function(self, host, ip_address) --luacheck: ignore 212/self 212/host
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
266 local parsed_ip = parse_ip(ip_address);
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
267 if not parsed_ip then
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
268 return false, "Failed to parse IP address";
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
269 end
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
270
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
271 local matches, total = 0, 0;
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
272
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
273 local promises = {};
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
274
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
275 for dnsbl in dnsbls do
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
276 total = total + 1;
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
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parents:
diff changeset
277 promises[dnsbl] = promise.new(function (resolve)
6425
987f0ee7d395 mod_dnsbl: Fix incorrect result from lookup
Matthew Wild <mwild1@gmail.com>
parents: 6424
diff changeset
278 check_dnsbl(parsed_ip.normal, dnsbl, function (_, hit)
987f0ee7d395 mod_dnsbl: Fix incorrect result from lookup
Matthew Wild <mwild1@gmail.com>
parents: 6424
diff changeset
279 resolve(hit);
987f0ee7d395 mod_dnsbl: Fix incorrect result from lookup
Matthew Wild <mwild1@gmail.com>
parents: 6424
diff changeset
280 end);
6133
99860e1b817d mod_dnsbl: Flag accounts registered by IPs matching blocklists
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parents:
diff changeset
281 end);
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282 end
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283
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284 return promise.all_settled(promises):next(function (results)
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285 for dnsbl, result in it.sorted_pairs(results) do
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286 local msg;
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287 if result.status == "fulfilled" then
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288 if result.value then
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289 msg = "[X]";
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290 matches = matches + 1;
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291 else
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292 msg = "[ ]";
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293 end
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294 else
6424
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295 msg = "[E]";
6133
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296 end
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297
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298 self.session.print(msg, dnsbl);
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299 if result.status == "rejected" then
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300 self.session.print(" ", "Error checking list: "..(result.reason:gsub("\n", "\n \t")));
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301 end
6133
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302 end
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303 return ("Found in %d of %d lists"):format(matches, total);
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304 end);
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305 end;
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306 });