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annotate mod_firewall/definitions.lib.lua @ 2520:c6fd8975704b

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mod_firewall: Initial support for lists, in-memory and HTTP
author Matthew Wild <mwild1@gmail.com>
date Sun, 19 Feb 2017 21:10:26 +0000
parents 5fe483b73fd2
children 72cbec103709
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rev   line source
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edec9de0220a mod_firewall: Silence warnings about unused arguments [luacheck]
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1
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2 -- Name arguments are unused here
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3 -- luacheck: ignore 212
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5 local definition_handlers = {};
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6
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7 local http = require "net.http";
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8 local timer = require "util.timer";
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9 local set = require"util.set";
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10 local new_throttle = require "util.throttle".create;
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11
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12 local multirate_cache_size = module:get_option_number("firewall_multirate_cache_limit", 1000);
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14 function definition_handlers.ZONE(zone_name, zone_members)
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15 local zone_member_list = {};
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16 for member in zone_members:gmatch("[^, ]+") do
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17 zone_member_list[#zone_member_list+1] = member;
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18 end
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19 return set.new(zone_member_list)._items;
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20 end
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21
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22 -- Helper function used by RATE handler
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23 local function evict_only_unthrottled(name, throttle)
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24 throttle:update();
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25 -- Check whether the throttle is at max balance (i.e. totally safe to forget about it)
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26 if throttle.balance < throttle.max then
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27 -- Not safe to forget
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28 return false;
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29 end
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30 end
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31
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32 function definition_handlers.RATE(name, line)
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33 local rate = assert(tonumber(line:match("([%d.]+)")), "Unable to parse rate");
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34 local burst = tonumber(line:match("%(%s*burst%s+([%d.]+)%s*%)")) or 1;
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35 local max_throttles = tonumber(line:match("%(%s*entries%s+([%d]+)%s*%)")) or multirate_cache_size;
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36 local deny_when_full = not line:match("%(allow overflow%)");
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37 return {
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38 single = function ()
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39 return new_throttle(rate*burst, burst);
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40 end;
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41
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42 multi = function ()
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43 local cache = require "util.cache".new(max_throttles, deny_when_full and evict_only_unthrottled or nil);
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44 return {
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45 poll_on = function (_, key, amount)
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46 assert(key, "no key");
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47 local throttle = cache:get(key);
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48 if not throttle then
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49 throttle = new_throttle(rate*burst, burst);
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50 if not cache:set(key, throttle) then
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51 module:log("warn", "Multirate '%s' has hit its maximum number of active throttles (%d), denying new events", name, max_throttles);
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52 return false;
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53 end
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54 end
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55 return throttle:poll(amount);
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56 end;
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57 }
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58 end;
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59 };
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60 end
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61
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62 local list_backends = {
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63 memory = {
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64 init = function (self, type, opts)
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65 if opts.limit then
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66 local have_cache_lib, cache_lib = pcall(require, "util.cache");
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67 if not have_cache_lib then
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68 error("In-memory lists with a size limit require Prosody 0.10");
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69 end
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70 self.cache = cache_lib.new((assert(tonumber(opts.limit), "Invalid list limit")));
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71 if not self.cache.table then
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72 error("In-memory lists with a size limit require a newer version of Prosody 0.10");
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73 end
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74 self.items = self.cache:table();
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75 else
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76 self.items = {};
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77 end
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78 end;
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79 add = function (self, item)
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80 self.items[item] = true;
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81 end;
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82 remove = function (self, item)
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83 self.items[item] = nil;
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84 end;
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85 contains = function (self, item)
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86 return self.items[item] == true;
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87 end;
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88 };
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89 http = {
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90 init = function (self, url, opts)
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91 local poll_interval = assert(tonumber(opts.ttl or "3600"), "invalid ttl for <"..url.."> (expected number of seconds)");
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92 local pattern = opts.pattern or "([^\r\n]+)\r?\n";
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93 assert(pcall(string.match, "", pattern), "invalid pattern for <"..url..">");
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94 if opts.hash then
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95 assert(opts.hash:match("^%w+$") and type(hashes[opts.hash]) == "function", "invalid hash function: "..opts.hash);
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96 self.hash_function = hashes[opts.hash];
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97 end
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98 local etag;
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99 local function update_list()
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100 http.request(url, {
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101 headers = {
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102 ["If-None-Match"] = etag;
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103 };
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104 }, function (body, code, response)
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105 if code == 200 and body then
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106 etag = response.headers.etag;
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107 local items = {};
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108 for entry in body:gmatch(pattern) do
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109 items[entry] = true;
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110 end
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111 self.items = items;
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112 module:log("debug", "Fetched updated list from <%s>", url);
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113 elseif code == 304 then
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114 module:log("debug", "List at <%s> is unchanged", url);
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115 else
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116 module:log("warn", "Failed to fetch list from <%s>: %d %s", url, code, tostring(body));
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117 end
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118 if poll_interval > 0 then
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119 timer.add_task(poll_interval, update_list);
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120 end
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121 end);
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122 end
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123 update_list();
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124 timer.add_task(0, update_list);
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125 end;
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126 contains = function (self, item)
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127 if self.hash_function then
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128 item = self.hash_function(item);
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129 end
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130 return self.items and self.items[item] == true;
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131 end;
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132 };
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133 };
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134
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135 local function create_list(list_backend, list_def, opts)
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136 if not list_backends[list_backend] then
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137 error("Unknown list type '"..list_backend.."'", 0);
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138 end
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139 local list = setmetatable({}, { __index = list_backends[list_backend] });
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140 if list.init then
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141 list:init(list_def, opts);
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142 end
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143 return list;
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144 end
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145
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146 --[[
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147 %LIST spammers: memory (source: /etc/spammers.txt)
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148
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149 %LIST spammers: memory (source: /etc/spammers.txt)
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150
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151
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152 %LIST spammers: http://example.com/blacklist.txt
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153 ]]
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154
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155 function definition_handlers.LIST(list_name, list_definition)
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156 local list_backend = list_definition:match("^%w+");
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157 local opts = {};
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158 local opt_string = list_definition:match("^%S+%s+%((.+)%)");
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159 if opt_string then
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160 for opt_k, opt_v in opt_string:gmatch("(%w+): ?([^,]+)") do
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161 opts[opt_k] = opt_v;
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162 end
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163 end
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164 return create_list(list_backend, list_definition:match("^%S+"), opts);
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165 end
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166
999
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167 return definition_handlers;