prosody-modules
d773a51af9b1
mod_firewall/mod_firewall.lua

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mod_firewall/mod_firewall.lua @ 960:d773a51af9b1

mod_firewall: Add actions EVENT (fire an event), JUMP EVENT (transfer control to the handlers of an event), JUMP CHAIN (transfer control to another mod_firewall chain)
author Matthew Wild <mwild1@gmail.com>
date Fri, 05 Apr 2013 18:08:16 +0100
parent 956:33d6642f4db7
child 965:d4e24fb289c0
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1
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2 local resolve_relative_path = require "core.configmanager".resolve_relative_path;
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3 local logger = require "util.logger".init;
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4 local set = require "util.set";
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5 local add_filter = require "util.filters".add_filter;
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6
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7 zones = {};
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8 local zones = zones;
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9 setmetatable(zones, {
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10 __index = function (zones, zone)
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11 local t = { [zone] = true };
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12 rawset(zones, zone, t);
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13 return t;
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14 end;
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15 });
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16
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17 local chains = {
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18 preroute = {
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19 type = "event";
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20 priority = 0.1;
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21 "pre-message/bare", "pre-message/full", "pre-message/host";
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22 "pre-presence/bare", "pre-presence/full", "pre-presence/host";
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23 "pre-iq/bare", "pre-iq/full", "pre-iq/host";
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24 };
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25 deliver = {
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26 type = "event";
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27 priority = 0.1;
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28 "message/bare", "message/full", "message/host";
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29 "presence/bare", "presence/full", "presence/host";
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30 "iq/bare", "iq/full", "iq/host";
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31 };
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32 deliver_remote = {
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33 type = "event"; "route/remote";
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34 priority = 0.1;
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35 };
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36 };
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37
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38 -- Dependency locations:
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39 -- <type lib>
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40 -- <type global>
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41 -- function handler()
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42 -- <local deps>
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43 -- if <conditions> then
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44 -- <actions>
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45 -- end
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46 -- end
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48 local available_deps = {
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49 st = { global_code = [[local st = require "util.stanza"]]};
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50 jid_split = {
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51 global_code = [[local jid_split = require "util.jid".split;]];
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52 };
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53 jid_bare = {
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54 global_code = [[local jid_bare = require "util.jid".bare;]];
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55 };
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56 to = { local_code = [[local to = stanza.attr.to;]] };
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57 from = { local_code = [[local from = stanza.attr.from;]] };
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58 type = { local_code = [[local type = stanza.attr.type;]] };
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59 name = { local_code = [[local name = stanza.name]] };
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60 split_to = { -- The stanza's split to address
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61 depends = { "jid_split", "to" };
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62 local_code = [[local to_node, to_host, to_resource = jid_split(to);]];
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63 };
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64 split_from = { -- The stanza's split from address
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65 depends = { "jid_split", "from" };
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66 local_code = [[local from_node, from_host, from_resource = jid_split(from);]];
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67 };
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68 bare_to = { depends = { "jid_bare", "to" }, local_code = "local bare_to = jid_bare(to)"};
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69 bare_from = { depends = { "jid_bare", "from" }, local_code = "local bare_from = jid_bare(from)"};
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70 group_contains = {
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71 global_code = [[local group_contains = module:depends("groups").group_contains]];
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72 };
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73 is_admin = { global_code = [[local is_admin = require "core.usermanager".is_admin]]};
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74 core_post_stanza = { global_code = [[local core_post_stanza = prosody.core_post_stanza]] };
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75 };
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76
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77 local function include_dep(dep, code)
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78 local dep_info = available_deps[dep];
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79 if not dep_info then
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80 module:log("error", "Dependency not found: %s", dep);
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81 return;
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82 end
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83 if code.included_deps[dep] then
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84 if code.included_deps[dep] ~= true then
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85 module:log("error", "Circular dependency on %s", dep);
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86 end
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87 return;
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88 end
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89 code.included_deps[dep] = false; -- Pending flag (used to detect circular references)
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90 for _, dep_dep in ipairs(dep_info.depends or {}) do
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91 include_dep(dep_dep, code);
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92 end
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93 if dep_info.global_code then
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94 table.insert(code.global_header, dep_info.global_code);
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95 end
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96 if dep_info.local_code then
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97 table.insert(code, "\n\t-- "..dep.."\n\t"..dep_info.local_code.."\n\n\t");
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98 end
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99 code.included_deps[dep] = true;
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100 end
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101
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102 local condition_handlers = module:require("conditions");
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103 local action_handlers = module:require("actions");
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104
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105 local function new_rule(ruleset, chain)
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106 assert(chain, "no chain specified");
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107 local rule = { conditions = {}, actions = {}, deps = {} };
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108 table.insert(ruleset[chain], rule);
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109 return rule;
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110 end
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111
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112 local function compile_firewall_rules(filename)
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113 local line_no = 0;
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114
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115 local function errmsg(err)
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116 return "Error compiling "..filename.." on line "..line_no..": "..err;
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117 end
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118
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119 local ruleset = {
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120 deliver = {};
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121 };
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122
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123 local chain = "deliver"; -- Default chain
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124 local rule;
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125
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diff changeset
126 local file, err = io.open(filename);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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diff changeset
127 if not file then return nil, err; end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
128
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129 local state; -- nil -> "rules" -> "actions" -> nil -> ...
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parents:
diff changeset
130
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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diff changeset
131 local line_hold;
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
132 for line in file:lines() do
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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133 line = line:match("^%s*(.-)%s*$");
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
134 if line_hold and line:sub(-1,-1) ~= "\\" then
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parents:
diff changeset
135 line = line_hold..line;
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
136 line_hold = nil;
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
137 elseif line:sub(-1,-1) == "\\" then
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
138 line_hold = (line_hold or "")..line:sub(1,-2);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
139 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
140 line_no = line_no + 1;
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
141
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
142 if line_hold or line:match("^[#;]") then
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
143 -- No action; comment or partial line
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
144 elseif line == "" then
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
145 if state == "rules" then
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
146 return nil, ("Expected an action on line %d for preceding criteria")
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
147 :format(line_no);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
148 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
149 state = nil;
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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diff changeset
150 elseif not(state) and line:match("^::") then
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
151 chain = line:gsub("^::%s*", "");
956
33d6642f4db7 mod_firewall: Tighten up error handling, and split rules->Lua and Lua->bytecode compilation into separate functions
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parents: 955
diff changeset
152 local chain_info = chains[chain_name];
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parents: 955
diff changeset
153 if not chain_info then
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parents: 955
diff changeset
154 return nil, errmsg("Unknown chain: "..chain_name);
33d6642f4db7 mod_firewall: Tighten up error handling, and split rules->Lua and Lua->bytecode compilation into separate functions
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parents: 955
diff changeset
155 elseif chain_info.type ~= "event" then
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parents: 955
diff changeset
156 return nil, errmsg("Only event chains supported at the moment");
33d6642f4db7 mod_firewall: Tighten up error handling, and split rules->Lua and Lua->bytecode compilation into separate functions
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parents: 955
diff changeset
157 end
947
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
158 ruleset[chain] = ruleset[chain] or {};
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
159 elseif not(state) and line:match("^ZONE ") then
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
160 local zone_name = line:match("^ZONE ([^:]+)");
956
33d6642f4db7 mod_firewall: Tighten up error handling, and split rules->Lua and Lua->bytecode compilation into separate functions
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parents: 955
diff changeset
161 if not zone_name:match("^%a[%w_]*$") then
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parents: 955
diff changeset
162 return nil, errmsg("Invalid character(s) in zone name: "..zone_name);
33d6642f4db7 mod_firewall: Tighten up error handling, and split rules->Lua and Lua->bytecode compilation into separate functions
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parents: 955
diff changeset
163 end
947
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
164 local zone_members = line:match("^ZONE .-: ?(.*)");
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165 local zone_member_list = {};
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
166 for member in zone_members:gmatch("[^, ]+") do
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
167 zone_member_list[#zone_member_list+1] = member;
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
168 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
169 zones[zone_name] = set.new(zone_member_list)._items;
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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diff changeset
170 elseif line:match("^[^%s:]+[%.=]") then
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parents:
diff changeset
171 -- Action
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
172 if state == nil then
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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diff changeset
173 -- This is a standalone action with no conditions
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
174 rule = new_rule(ruleset, chain);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
175 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
176 state = "actions";
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parents:
diff changeset
177 -- Action handlers?
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
178 local action = line:match("^%P+");
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
179 if not action_handlers[action] then
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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diff changeset
180 return nil, ("Unknown action on line %d: %s"):format(line_no, action or "<unknown>");
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
181 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
182 table.insert(rule.actions, "-- "..line)
956
33d6642f4db7 mod_firewall: Tighten up error handling, and split rules->Lua and Lua->bytecode compilation into separate functions
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parents: 955
diff changeset
183 local ok, action_string, action_deps = pcall(action_handlers[action], line:match("=(.+)$"));
33d6642f4db7 mod_firewall: Tighten up error handling, and split rules->Lua and Lua->bytecode compilation into separate functions
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parents: 955
diff changeset
184 if not ok then
33d6642f4db7 mod_firewall: Tighten up error handling, and split rules->Lua and Lua->bytecode compilation into separate functions
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parents: 955
diff changeset
185 return nil, errmsg(action_string);
33d6642f4db7 mod_firewall: Tighten up error handling, and split rules->Lua and Lua->bytecode compilation into separate functions
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parents: 955
diff changeset
186 end
947
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
187 table.insert(rule.actions, action_string);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
188 for _, dep in ipairs(action_deps or {}) do
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
189 table.insert(rule.deps, dep);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
190 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
191 elseif state == "actions" then -- state is actions but action pattern did not match
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
192 state = nil; -- Awaiting next rule, etc.
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
193 table.insert(ruleset[chain], rule);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
194 rule = nil;
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
195 else
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
196 if not state then
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
197 state = "rules";
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
198 rule = new_rule(ruleset, chain);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
199 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
200 -- Check standard modifiers for the condition (e.g. NOT)
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
201 local negated;
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
202 local condition = line:match("^[^:=%.]*");
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
203 if condition:match("%f[%w]NOT%f[^%w]") then
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
204 local s, e = condition:match("%f[%w]()NOT()%f[^%w]");
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
205 condition = (condition:sub(1,s-1)..condition:sub(e+1, -1)):match("^%s*(.-)%s*$");
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
206 negated = true;
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
207 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
208 condition = condition:gsub(" ", "");
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
209 if not condition_handlers[condition] then
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
210 return nil, ("Unknown condition on line %d: %s"):format(line_no, condition);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
211 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
212 -- Get the code for this condition
956
33d6642f4db7 mod_firewall: Tighten up error handling, and split rules->Lua and Lua->bytecode compilation into separate functions
Matthew Wild <mwild1@gmail.com>
parents: 955
diff changeset
213 local ok, condition_code, condition_deps = pcall(condition_handlers[condition], line:match(":%s?(.+)$"));
33d6642f4db7 mod_firewall: Tighten up error handling, and split rules->Lua and Lua->bytecode compilation into separate functions
Matthew Wild <mwild1@gmail.com>
parents: 955
diff changeset
214 if not ok then
33d6642f4db7 mod_firewall: Tighten up error handling, and split rules->Lua and Lua->bytecode compilation into separate functions
Matthew Wild <mwild1@gmail.com>
parents: 955
diff changeset
215 return nil, errmsg(condition_code);
33d6642f4db7 mod_firewall: Tighten up error handling, and split rules->Lua and Lua->bytecode compilation into separate functions
Matthew Wild <mwild1@gmail.com>
parents: 955
diff changeset
216 end
947
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
217 if negated then condition_code = "not("..condition_code..")"; end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
218 table.insert(rule.conditions, condition_code);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
219 for _, dep in ipairs(condition_deps or {}) do
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
220 table.insert(rule.deps, dep);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
221 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
222 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
223 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
224
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
225 -- Compile ruleset and return complete code
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
226
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
227 local chain_handlers = {};
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
228
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
229 -- Loop through the chains in the parsed ruleset (e.g. incoming, outgoing)
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
230 for chain_name, rules in pairs(ruleset) do
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
231 local code = { included_deps = {}, global_header = {} };
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
232 -- This inner loop assumes chain is an event-based, not a filter-based
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
233 -- chain (filter-based will be added later)
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
234 for _, rule in ipairs(rules) do
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
235 for _, dep in ipairs(rule.deps) do
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
236 include_dep(dep, code);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
237 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
238 local rule_code = "if ("..table.concat(rule.conditions, ") and (")..") then\n\t"
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
239 ..table.concat(rule.actions, "\n\t")
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
240 .."\n end\n";
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
241 table.insert(code, rule_code);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
242 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
243
960
d773a51af9b1 mod_firewall: Add actions EVENT (fire an event), JUMP EVENT (transfer control to the handlers of an event), JUMP CHAIN (transfer control to another mod_firewall chain)
Matthew Wild <mwild1@gmail.com>
parents: 956
diff changeset
244 local code_string = [[return function (zones, fire_event, log)
947
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
245 ]]..table.concat(code.global_header, "\n")..[[
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
246 local db = require 'util.debug'
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
247 return function (event)
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
248 local stanza, session = event.stanza, event.origin;
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249
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250 ]]..table.concat(code, " ")..[[
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251 end;
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252 end]];
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253
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254 chain_handlers[chain_name] = code_string;
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255 end
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256
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257 return chain_handlers;
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258 end
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259
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260 local function compile_handler(code_string, filename)
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261 print(code_string)
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262 -- Prepare event handler function
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263 local chunk, err = loadstring(code_string, "="..filename);
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264 if not chunk then
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265 return nil, "Error compiling (probably a compiler bug, please report): "..err;
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266 end
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267 local function fire_event(name, data)
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268 return module:fire_event(name, data);
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269 end
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270 chunk = chunk()(zones, fire_event, logger(filename)); -- Returns event handler with 'zones' upvalue.
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271 return chunk;
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272 end
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273
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274 function module.load()
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275 local firewall_scripts = module:get_option_set("firewall_scripts", {});
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276 for script in firewall_scripts do
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277 script = resolve_relative_path(prosody.paths.config, script);
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278 local chain_functions, err = compile_firewall_rules(script)
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279
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280 if not chain_functions then
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281 module:log("error", "Error compiling %s: %s", script, err or "unknown error");
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282 else
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283 for chain, handler_code in pairs(chain_functions) do
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284 local handler, err = compile_handler(handler_code, "mod_firewall::"..chain);
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285 if not handler then
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286 module:log("error", "Compilation error for %s: %s", script, err);
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287 else
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288 local chain_definition = chains[chain];
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289 if chain_definition and chain_definition.type == "event" then
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290 for _, event_name in ipairs(chain_definition) do
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291 module:hook(event_name, handler, chain_definition.priority);
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292 end
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293 elseif not chain_name:match("^user/") then
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294 module:log("warn", "Unknown chain %q", chain);
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295 end
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296 module:hook("firewall/chains/"..chain, handler);
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297 end
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298 end
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299 end
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300 end
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301 end