prosody-modules
c91cac3b823f
mod_firewall/actions.lib.lua

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mod_firewall/actions.lib.lua @ 947:c91cac3b823f

mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
author Matthew Wild <mwild1@gmail.com>
date Wed, 03 Apr 2013 16:11:20 +0100
child 949:b729414b4bf1
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947
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1 local action_handlers = {};
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2
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3 -- Takes an XML string and returns a code string that builds that stanza
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4 -- using st.stanza()
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5 local function compile_xml(data)
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6 local code = {};
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7 local first, short_close = true, nil;
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8 for tagline, text in data:gmatch("<([^>]+)>([^<]*)") do
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9 if tagline:sub(-1,-1) == "/" then
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10 tagline = tagline:sub(1, -2);
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11 short_close = true;
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12 end
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13 if tagline:sub(1,1) == "/" then
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14 code[#code+1] = (":up()");
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15 else
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16 local name, attr = tagline:match("^(%S*)%s*(.*)$");
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17 local attr_str = {};
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18 for k, _, v in attr:gmatch("(%S+)=([\"'])([^%2]-)%2") do
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19 if #attr_str == 0 then
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20 table.insert(attr_str, ", { ");
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21 else
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22 table.insert(attr_str, ", ");
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23 end
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24 if k:match("^%a%w*$") then
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25 table.insert(attr_str, string.format("%s = %q", k, v));
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26 else
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27 table.insert(attr_str, string.format("[%q] = %q", k, v));
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28 end
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29 end
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30 if #attr_str > 0 then
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31 table.insert(attr_str, " }");
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32 end
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33 if first then
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34 code[#code+1] = (string.format("st.stanza(%q %s)", name, #attr_str>0 and table.concat(attr_str) or ", nil"));
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35 first = nil;
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36 else
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37 code[#code+1] = (string.format(":tag(%q%s)", name, table.concat(attr_str)));
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38 end
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39 end
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40 if text and text:match("%S") then
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41 code[#code+1] = (string.format(":text(%q)", text));
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42 elseif short_close then
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43 short_close = nil;
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44 code[#code+1] = (":up()");
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45 end
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46 end
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47 return table.concat(code, "");
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48 end
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49
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50
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51 function action_handlers.DROP()
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52 return "log('debug', 'Firewall dropping stanza: %s', tostring(stanza)); return true;";
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53 end
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54
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55 function action_handlers.STRIP(tag_desc)
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56 local code = {};
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57 local name, xmlns = tag_desc:match("^(%S+) (.+)$");
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58 if not name then
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59 name, xmlns = tag_desc, nil;
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60 end
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61 if name == "*" then
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62 name = nil;
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63 end
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64 code[#code+1] = ("local stanza_xmlns = stanza.attr.xmlns; ");
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65 code[#code+1] = "stanza:maptags(function (tag) if ";
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66 if name then
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67 code[#code+1] = ("tag.name == %q and "):format(name);
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68 end
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69 if xmlns then
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70 code[#code+1] = ("(tag.attr.xmlns or stanza_xmlns) == %q "):format(xmlns);
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71 else
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72 code[#code+1] = ("tag.attr.xmlns == stanza_xmlns ");
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73 end
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74 code[#code+1] = "then return nil; end return tag; end );";
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75 return table.concat(code);
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76 end
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77
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78 function action_handlers.INJECT(tag)
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79 return "stanza:add_child("..compile_xml(tag)..")", { "st" };
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80 end
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81
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82 local error_types = {
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83 ["bad-request"] = "modify";
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84 ["conflict"] = "cancel";
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85 ["feature-not-implemented"] = "cancel";
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86 ["forbidden"] = "auth";
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87 ["gone"] = "cancel";
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88 ["internal-server-error"] = "cancel";
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89 ["item-not-found"] = "cancel";
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90 ["jid-malformed"] = "modify";
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91 ["not-acceptable"] = "modify";
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92 ["not-allowed"] = "cancel";
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93 ["not-authorized"] = "auth";
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94 ["payment-required"] = "auth";
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95 ["policy-violation"] = "modify";
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96 ["recipient-unavailable"] = "wait";
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97 ["redirect"] = "modify";
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98 ["registration-required"] = "auth";
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99 ["remote-server-not-found"] = "cancel";
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100 ["remote-server-timeout"] = "wait";
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101 ["resource-constraint"] = "wait";
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102 ["service-unavailable"] = "cancel";
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103 ["subscription-required"] = "auth";
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104 ["undefined-condition"] = "cancel";
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105 ["unexpected-request"] = "wait";
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106 };
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107
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108
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109 local function route_modify(make_new, to, drop)
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110 local reroute, deps = "session.send(newstanza)", { "st" };
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111 if to then
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112 reroute = ("newstanza.attr.to = %q; core_post_stanza(session, newstanza)"):format(to);
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113 deps[#deps+1] = "core_post_stanza";
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114 end
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115 return ([[local newstanza = st.%s; %s; %s; ]])
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116 :format(make_new, reroute, drop and "return true" or ""), deps;
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117 end
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118
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119 function action_handlers.BOUNCE(with)
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120 local error = with and with:match("^%S+") or "service-unavailable";
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121 local error_type = error:match(":(%S+)");
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122 if not error_type then
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123 error_type = error_types[error] or "cancel";
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124 else
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125 error = error:match("^[^:]+");
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126 end
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127 error, error_type = string.format("%q", error), string.format("%q", error_type);
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128 local text = with and with:match(" %((.+)%)$");
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129 if text then
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130 text = string.format("%q", text);
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131 else
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132 text = "nil";
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133 end
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134 return route_modify(("error_reply(stanza, %s, %s, %s)"):format(error_type, error, text), nil, true);
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135 end
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136
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137 function action_handlers.REDIRECT(where)
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138 return route_modify("clone(stanza)", where, true, true);
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139 end
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140
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141 function action_handlers.COPY(where)
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142 return route_modify("clone(stanza)", where, true, false);
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143 end
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144
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145 function action_handlers.LOG(string)
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146 local level = string:match("^%[(%a+)%]") or "info";
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147 string = string:gsub("^%[%a+%] ?", "");
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148 return (("log(%q, %q)"):format(level, string)
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149 :gsub("$top", [["..stanza:top_tag().."]])
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150 :gsub("$stanza", [["..stanza.."]])
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151 :gsub("$(%b())", [["..%1.."]]));
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152 end
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153
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154 function action_handlers.RULEDEP(dep)
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155 return "", { dep };
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156 end
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157
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158 return action_handlers;