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annotate mod_firewall/actions.lib.lua @ 2094:a1e9ca4cb181

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mod_firewall: BOUNCE: Don't bounce error stanzas or iq results
author Matthew Wild <mwild1@gmail.com>
date Wed, 16 Mar 2016 12:42:17 +0000
parents de6b95d5e01b
children f2ee508315e1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 local action_handlers = {};
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2
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3
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4 -- Run code through this to allow strings to contain code. e.g.: LOG=Received: $(stanza:top_tag())
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5 local function meta(s, extra)
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6 return (s:gsub("$(%b())", [["..tostring(%1).."]])
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7 :gsub("$(%b<>)", [["..stanza:find("%1").."]])
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8 :gsub("$$(%a+)", extra or {}));
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9 end
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10
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11 -- Takes an XML string and returns a code string that builds that stanza
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12 -- using st.stanza()
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13 local function compile_xml(data)
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14 local code = {};
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15 local first, short_close = true, nil;
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16 for tagline, text in data:gmatch("<([^>]+)>([^<]*)") do
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17 if tagline:sub(-1,-1) == "/" then
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18 tagline = tagline:sub(1, -2);
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19 short_close = true;
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20 end
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21 if tagline:sub(1,1) == "/" then
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22 code[#code+1] = (":up()");
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23 else
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24 local name, attr = tagline:match("^(%S*)%s*(.*)$");
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25 local attr_str = {};
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26 for k, _, v in attr:gmatch("(%S+)=([\"'])([^%2]-)%2") do
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27 if #attr_str == 0 then
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28 table.insert(attr_str, ", { ");
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29 else
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30 table.insert(attr_str, ", ");
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31 end
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32 if k:find("^%a%w*$") then
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33 table.insert(attr_str, string.format("%s = %q", k, v));
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34 else
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35 table.insert(attr_str, string.format("[%q] = %q", k, v));
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36 end
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37 end
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38 if #attr_str > 0 then
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39 table.insert(attr_str, " }");
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40 end
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41 if first then
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42 code[#code+1] = (string.format("st.stanza(%q %s)", name, #attr_str>0 and table.concat(attr_str) or ", nil"));
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43 first = nil;
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44 else
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45 code[#code+1] = (string.format(":tag(%q%s)", name, table.concat(attr_str)));
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46 end
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47 end
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48 if text and text:find("%S") then
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49 code[#code+1] = (string.format(":text(%q)", text));
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50 elseif short_close then
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51 short_close = nil;
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52 code[#code+1] = (":up()");
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53 end
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54 end
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55 return table.concat(code, "");
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56 end
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57
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58 function action_handlers.PASS()
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59 return "do return end"
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60 end
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61
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62 function action_handlers.DROP()
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63 return "do return true end";
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64 end
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65
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66 function action_handlers.STRIP(tag_desc)
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67 local code = {};
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68 local name, xmlns = tag_desc:match("^(%S+) (.+)$");
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69 if not name then
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70 name, xmlns = tag_desc, nil;
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71 end
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72 if name == "*" then
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73 name = nil;
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74 end
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75 code[#code+1] = ("local stanza_xmlns = stanza.attr.xmlns; ");
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76 code[#code+1] = "stanza:maptags(function (tag) if ";
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77 if name then
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78 code[#code+1] = ("tag.name == %q and "):format(name);
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79 end
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80 if xmlns then
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81 code[#code+1] = ("(tag.attr.xmlns or stanza_xmlns) == %q "):format(xmlns);
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82 else
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83 code[#code+1] = ("tag.attr.xmlns == stanza_xmlns ");
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84 end
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85 code[#code+1] = "then return nil; end return tag; end );";
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86 return table.concat(code);
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87 end
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88
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89 function action_handlers.INJECT(tag)
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90 return "stanza:add_child("..compile_xml(tag)..")", { "st" };
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91 end
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92
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93 local error_types = {
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94 ["bad-request"] = "modify";
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95 ["conflict"] = "cancel";
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96 ["feature-not-implemented"] = "cancel";
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97 ["forbidden"] = "auth";
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98 ["gone"] = "cancel";
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99 ["internal-server-error"] = "cancel";
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100 ["item-not-found"] = "cancel";
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101 ["jid-malformed"] = "modify";
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102 ["not-acceptable"] = "modify";
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103 ["not-allowed"] = "cancel";
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104 ["not-authorized"] = "auth";
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105 ["payment-required"] = "auth";
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106 ["policy-violation"] = "modify";
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107 ["recipient-unavailable"] = "wait";
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108 ["redirect"] = "modify";
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109 ["registration-required"] = "auth";
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110 ["remote-server-not-found"] = "cancel";
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111 ["remote-server-timeout"] = "wait";
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112 ["resource-constraint"] = "wait";
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113 ["service-unavailable"] = "cancel";
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114 ["subscription-required"] = "auth";
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115 ["undefined-condition"] = "cancel";
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116 ["unexpected-request"] = "wait";
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117 };
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118
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119
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120 local function route_modify(make_new, to, drop)
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121 local reroute, deps = "session.send(newstanza)", { "st" };
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122 if to then
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123 reroute = ("newstanza.attr.to = %q; core_post_stanza(session, newstanza)"):format(to);
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124 deps[#deps+1] = "core_post_stanza";
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125 end
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126 return ([[local newstanza = st.%s; %s;%s]])
8a3f3f485675 mod_firewall: Produce code with nicer indentation
Florian Zeitz <florob@babelmonkeys.de>
parents: 961
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127 :format(make_new, reroute, drop and " return true;" or ""), deps;
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128 end
1343
7dbde05b48a9 all the things: Remove trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 1303
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129
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130 function action_handlers.BOUNCE(with)
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131 local error = with and with:match("^%S+") or "service-unavailable";
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132 local error_type = error:match(":(%S+)");
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133 if not error_type then
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134 error_type = error_types[error] or "cancel";
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135 else
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136 error = error:match("^[^:]+");
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137 end
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138 error, error_type = string.format("%q", error), string.format("%q", error_type);
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parents:
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139 local text = with and with:match(" %((.+)%)$");
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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140 if text then
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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141 text = string.format("%q", text);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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142 else
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parents:
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143 text = "nil";
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
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144 end
2094
a1e9ca4cb181 mod_firewall: BOUNCE: Don't bounce error stanzas or iq results
Matthew Wild <mwild1@gmail.com>
parents: 2086
diff changeset
145 local route_modify_code, deps = route_modify(("error_reply(stanza, %s, %s, %s)"):format(error_type, error, text), nil, true);
a1e9ca4cb181 mod_firewall: BOUNCE: Don't bounce error stanzas or iq results
Matthew Wild <mwild1@gmail.com>
parents: 2086
diff changeset
146 deps[#deps+1] = "type";
a1e9ca4cb181 mod_firewall: BOUNCE: Don't bounce error stanzas or iq results
Matthew Wild <mwild1@gmail.com>
parents: 2086
diff changeset
147 deps[#deps+1] = "name";
a1e9ca4cb181 mod_firewall: BOUNCE: Don't bounce error stanzas or iq results
Matthew Wild <mwild1@gmail.com>
parents: 2086
diff changeset
148 return [[if type == "error" or (name == "iq" and type == "result") then return true; end -- Don't reply to 'error' stanzas, or iq results
a1e9ca4cb181 mod_firewall: BOUNCE: Don't bounce error stanzas or iq results
Matthew Wild <mwild1@gmail.com>
parents: 2086
diff changeset
149 ]]..route_modify_code, deps;
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150 end
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151
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parents:
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152 function action_handlers.REDIRECT(where)
950
bea0ef13575c mod_firewall/actions: Remove unused extra argument.
Kim Alvefur <zash@zash.se>
parents: 949
diff changeset
153 return route_modify("clone(stanza)", where, true);
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154 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
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155
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
156 function action_handlers.COPY(where)
950
bea0ef13575c mod_firewall/actions: Remove unused extra argument.
Kim Alvefur <zash@zash.se>
parents: 949
diff changeset
157 return route_modify("clone(stanza)", where, false);
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158 end
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parents:
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159
959
6ef334596276 mod_firewall/actions: Add REPLY
Matthew Wild <mwild1@gmail.com>
parents: 958
diff changeset
160 function action_handlers.REPLY(with)
6ef334596276 mod_firewall/actions: Add REPLY
Matthew Wild <mwild1@gmail.com>
parents: 958
diff changeset
161 return route_modify(("reply(stanza):body(%q)"):format(with));
6ef334596276 mod_firewall/actions: Add REPLY
Matthew Wild <mwild1@gmail.com>
parents: 958
diff changeset
162 end
6ef334596276 mod_firewall/actions: Add REPLY
Matthew Wild <mwild1@gmail.com>
parents: 958
diff changeset
163
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diff changeset
164 function action_handlers.LOG(string)
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
165 local level = string:match("^%[(%a+)%]") or "info";
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
166 string = string:gsub("^%[%a+%] ?", "");
961
f0108ec2b016 mod_firewall/actions: Break out logic into a separate reusable function
Matthew Wild <mwild1@gmail.com>
parents: 960
diff changeset
167 return meta(("log(%q, %q)"):format(level, string));
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parents:
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168 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
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169
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
170 function action_handlers.RULEDEP(dep)
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parents:
diff changeset
171 return "", { dep };
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
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172 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
173
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: 959
diff changeset
174 function action_handlers.EVENT(name)
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: 959
diff changeset
175 return ("fire_event(%q, event)"):format(name);
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: 959
diff changeset
176 end
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: 959
diff changeset
177
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: 959
diff changeset
178 function action_handlers.JUMP_EVENT(name)
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: 959
diff changeset
179 return ("do return fire_event(%q, event); end"):format(name);
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: 959
diff changeset
180 end
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: 959
diff changeset
181
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: 959
diff changeset
182 function action_handlers.JUMP_CHAIN(name)
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: 959
diff changeset
183 return ("do return fire_event(%q, event); end"):format("firewall/chains/"..name);
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: 959
diff changeset
184 end
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: 959
diff changeset
185
947
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parents:
diff changeset
186 return action_handlers;