prosody-modules
cc01a5bfcf3b
mod_firewall/actions.lib.lua

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mod_firewall/actions.lib.lua @ 2556:cc01a5bfcf3b

mod_firewall: spam-blocking.pfw, initial anti-spam ruleset
author Matthew Wild <mwild1@gmail.com>
date Thu, 23 Feb 2017 14:14:38 +0000
parent 2551:9392f45b0364
child 2558:2b533a7b5236
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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edf5cf3c474b mod_firewall: Move meta() function to main module, and make it a global so libs can use it
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1 --luacheck: globals meta idsafe
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2 local action_handlers = {};
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3
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4
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5 -- Takes an XML string and returns a code string that builds that stanza
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6 -- using st.stanza()
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7 local function compile_xml(data)
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8 local code = {};
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9 local first, short_close = true, nil;
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10 for tagline, text in data:gmatch("<([^>]+)>([^<]*)") do
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11 if tagline:sub(-1,-1) == "/" then
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12 tagline = tagline:sub(1, -2);
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13 short_close = true;
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14 end
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15 if tagline:sub(1,1) == "/" then
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16 code[#code+1] = (":up()");
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17 else
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18 local name, attr = tagline:match("^(%S*)%s*(.*)$");
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19 local attr_str = {};
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20 for k, _, v in attr:gmatch("(%S+)=([\"'])([^%2]-)%2") do
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21 if #attr_str == 0 then
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22 table.insert(attr_str, ", { ");
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23 else
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24 table.insert(attr_str, ", ");
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25 end
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26 if k:find("^%a%w*$") then
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27 table.insert(attr_str, string.format("%s = %q", k, v));
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28 else
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29 table.insert(attr_str, string.format("[%q] = %q", k, v));
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30 end
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31 end
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32 if #attr_str > 0 then
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33 table.insert(attr_str, " }");
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34 end
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35 if first then
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36 code[#code+1] = (string.format("st.stanza(%q %s)", name, #attr_str>0 and table.concat(attr_str) or ", nil"));
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37 first = nil;
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38 else
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39 code[#code+1] = (string.format(":tag(%q%s)", name, table.concat(attr_str)));
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40 end
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41 end
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42 if text and text:find("%S") then
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43 code[#code+1] = (string.format(":text(%q)", text));
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44 elseif short_close then
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45 short_close = nil;
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46 code[#code+1] = (":up()");
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47 end
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48 end
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49 return table.concat(code, "");
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50 end
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51
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52 function action_handlers.PASS()
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53 return "do return end"
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54 end
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55
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56 function action_handlers.DROP()
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57 return "do return true end";
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58 end
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59
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60 function action_handlers.STRIP(tag_desc)
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61 local code = {};
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62 local name, xmlns = tag_desc:match("^(%S+) (.+)$");
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63 if not name then
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64 name, xmlns = tag_desc, nil;
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65 end
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66 if name == "*" then
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67 name = nil;
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68 end
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69 code[#code+1] = ("local stanza_xmlns = stanza.attr.xmlns; ");
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70 code[#code+1] = "stanza:maptags(function (tag) if ";
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71 if name then
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72 code[#code+1] = ("tag.name == %q and "):format(name);
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73 end
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74 if xmlns then
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75 code[#code+1] = ("(tag.attr.xmlns or stanza_xmlns) == %q "):format(xmlns);
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76 else
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77 code[#code+1] = ("tag.attr.xmlns == stanza_xmlns ");
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78 end
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79 code[#code+1] = "then return nil; end return tag; end );";
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80 return table.concat(code);
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81 end
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82
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83 function action_handlers.INJECT(tag)
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84 return "stanza:add_child("..compile_xml(tag)..")", { "st" };
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85 end
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86
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87 local error_types = {
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88 ["bad-request"] = "modify";
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89 ["conflict"] = "cancel";
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90 ["feature-not-implemented"] = "cancel";
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91 ["forbidden"] = "auth";
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92 ["gone"] = "cancel";
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93 ["internal-server-error"] = "cancel";
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94 ["item-not-found"] = "cancel";
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95 ["jid-malformed"] = "modify";
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96 ["not-acceptable"] = "modify";
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97 ["not-allowed"] = "cancel";
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98 ["not-authorized"] = "auth";
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99 ["payment-required"] = "auth";
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100 ["policy-violation"] = "modify";
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101 ["recipient-unavailable"] = "wait";
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102 ["redirect"] = "modify";
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103 ["registration-required"] = "auth";
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104 ["remote-server-not-found"] = "cancel";
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105 ["remote-server-timeout"] = "wait";
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106 ["resource-constraint"] = "wait";
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107 ["service-unavailable"] = "cancel";
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108 ["subscription-required"] = "auth";
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109 ["undefined-condition"] = "cancel";
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110 ["unexpected-request"] = "wait";
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111 };
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112
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113
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114 local function route_modify(make_new, to, drop)
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115 local reroute, deps = "session.send(newstanza)", { "st" };
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116 if to then
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117 reroute = ("newstanza.attr.to = %q; core_post_stanza(session, newstanza);"):format(to);
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118 deps[#deps+1] = "core_post_stanza";
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119 end
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120 return ([[local newstanza = st.%s; %s;%s]])
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121 :format(make_new, reroute, drop and " return true;" or ""), deps;
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122 end
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123
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124 function action_handlers.BOUNCE(with)
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125 local error = with and with:match("^%S+") or "service-unavailable";
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126 local error_type = error:match(":(%S+)");
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parents:
diff changeset
127 if not error_type then
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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128 error_type = error_types[error] or "cancel";
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129 else
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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130 error = error:match("^[^:]+");
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parents:
diff changeset
131 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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diff changeset
132 error, error_type = string.format("%q", error), string.format("%q", error_type);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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diff changeset
133 local text = with and with:match(" %((.+)%)$");
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parents:
diff changeset
134 if text then
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parents:
diff changeset
135 text = string.format("%q", text);
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
136 else
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
137 text = "nil";
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
138 end
2094
a1e9ca4cb181 mod_firewall: BOUNCE: Don't bounce error stanzas or iq results
Matthew Wild <mwild1@gmail.com>
parents: 2086
diff changeset
139 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
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parents: 2086
diff changeset
140 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
141 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
142 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
143 ]]..route_modify_code, deps;
947
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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diff changeset
144 end
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parents:
diff changeset
145
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
146 function action_handlers.REDIRECT(where)
950
bea0ef13575c mod_firewall/actions: Remove unused extra argument.
Kim Alvefur <zash@zash.se>
parents: 949
diff changeset
147 return route_modify("clone(stanza)", where, true);
947
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148 end
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149
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
150 function action_handlers.COPY(where)
950
bea0ef13575c mod_firewall/actions: Remove unused extra argument.
Kim Alvefur <zash@zash.se>
parents: 949
diff changeset
151 return route_modify("clone(stanza)", where, false);
947
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152 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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diff changeset
153
959
6ef334596276 mod_firewall/actions: Add REPLY
Matthew Wild <mwild1@gmail.com>
parents: 958
diff changeset
154 function action_handlers.REPLY(with)
6ef334596276 mod_firewall/actions: Add REPLY
Matthew Wild <mwild1@gmail.com>
parents: 958
diff changeset
155 return route_modify(("reply(stanza):body(%q)"):format(with));
6ef334596276 mod_firewall/actions: Add REPLY
Matthew Wild <mwild1@gmail.com>
parents: 958
diff changeset
156 end
6ef334596276 mod_firewall/actions: Add REPLY
Matthew Wild <mwild1@gmail.com>
parents: 958
diff changeset
157
2541
76f03d514b13 mod_firewall: Add FORWARD action (XEP-0297)
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parents: 2531
diff changeset
158 function action_handlers.FORWARD(where)
76f03d514b13 mod_firewall: Add FORWARD action (XEP-0297)
Matthew Wild <mwild1@gmail.com>
parents: 2531
diff changeset
159 local code = [[
2551
9392f45b0364 mod_firewall: Fix FORWARD to send from current module's host
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parents: 2542
diff changeset
160 local newstanza = st.stanza("message", { to = %q, from = current_host }):tag("forwarded", { xmlns = "urn:xmpp:forward:0" });
2541
76f03d514b13 mod_firewall: Add FORWARD action (XEP-0297)
Matthew Wild <mwild1@gmail.com>
parents: 2531
diff changeset
161 local tmp_stanza = st.clone(stanza); tmp_stanza.attr.xmlns = "jabber:client"; newstanza:add_child(tmp_stanza);
76f03d514b13 mod_firewall: Add FORWARD action (XEP-0297)
Matthew Wild <mwild1@gmail.com>
parents: 2531
diff changeset
162 core_post_stanza(session, newstanza);
76f03d514b13 mod_firewall: Add FORWARD action (XEP-0297)
Matthew Wild <mwild1@gmail.com>
parents: 2531
diff changeset
163 ]];
2551
9392f45b0364 mod_firewall: Fix FORWARD to send from current module's host
Matthew Wild <mwild1@gmail.com>
parents: 2542
diff changeset
164 return code:format(where), { "core_post_stanza", "current_host" };
2541
76f03d514b13 mod_firewall: Add FORWARD action (XEP-0297)
Matthew Wild <mwild1@gmail.com>
parents: 2531
diff changeset
165 end
76f03d514b13 mod_firewall: Add FORWARD action (XEP-0297)
Matthew Wild <mwild1@gmail.com>
parents: 2531
diff changeset
166
947
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diff changeset
167 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
168 local level = string:match("^%[(%a+)%]") or "info";
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
169 string = string:gsub("^%[%a+%] ?", "");
2519
d4bc434a60a4 mod_firewall: Update functions that use meta() to allow functions with deps inside expressions
Matthew Wild <mwild1@gmail.com>
parents: 2415
diff changeset
170 local meta_deps = {};
d4bc434a60a4 mod_firewall: Update functions that use meta() to allow functions with deps inside expressions
Matthew Wild <mwild1@gmail.com>
parents: 2415
diff changeset
171 local code = meta(("(session.log or log)(%q, %q);"):format(level, string), meta_deps);
d4bc434a60a4 mod_firewall: Update functions that use meta() to allow functions with deps inside expressions
Matthew Wild <mwild1@gmail.com>
parents: 2415
diff changeset
172 return code, meta_deps;
947
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parents:
diff changeset
173 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
174
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
175 function action_handlers.RULEDEP(dep)
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
176 return "", { dep };
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
177 end
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
178
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
179 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
180 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
181 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
182
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 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
184 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
185 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
186
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
187 function action_handlers.JUMP_CHAIN(name)
2106
f2ee508315e1 mod_firewall: JUMP_CHAIN: Fix implementation to match docs (i.e. continue processing current chain if stanza not handled)
Matthew Wild <mwild1@gmail.com>
parents: 2094
diff changeset
188 return ("if fire_event(%q, event) then return true; end"):format("firewall/chains/"..name);
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
189 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
190
2107
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2106
diff changeset
191 function action_handlers.MARK_ORIGIN(name)
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2106
diff changeset
192 return [[session.firewall_marked_]]..idsafe(name)..[[ = current_timestamp;]], { "timestamp" };
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2106
diff changeset
193 end
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2106
diff changeset
194
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2106
diff changeset
195 function action_handlers.UNMARK_ORIGIN(name)
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2106
diff changeset
196 return [[session.firewall_marked_]]..idsafe(name)..[[ = nil;]]
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2106
diff changeset
197 end
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2106
diff changeset
198
2531
9d2bfff515b8 mod_firewall: Add 'ADD TO' action for adding to lists
Matthew Wild <mwild1@gmail.com>
parents: 2519
diff changeset
199 function action_handlers.ADD_TO(spec)
9d2bfff515b8 mod_firewall: Add 'ADD TO' action for adding to lists
Matthew Wild <mwild1@gmail.com>
parents: 2519
diff changeset
200 local list_name, value = spec:match("(%S+) (.+)");
9d2bfff515b8 mod_firewall: Add 'ADD TO' action for adding to lists
Matthew Wild <mwild1@gmail.com>
parents: 2519
diff changeset
201 local meta_deps = {};
9d2bfff515b8 mod_firewall: Add 'ADD TO' action for adding to lists
Matthew Wild <mwild1@gmail.com>
parents: 2519
diff changeset
202 value = meta(("%q"):format(value), meta_deps);
9d2bfff515b8 mod_firewall: Add 'ADD TO' action for adding to lists
Matthew Wild <mwild1@gmail.com>
parents: 2519
diff changeset
203 return ("list_%s:add(%s);"):format(list_name, value), { "list:"..list_name, unpack(meta_deps) };
9d2bfff515b8 mod_firewall: Add 'ADD TO' action for adding to lists
Matthew Wild <mwild1@gmail.com>
parents: 2519
diff changeset
204 end
9d2bfff515b8 mod_firewall: Add 'ADD TO' action for adding to lists
Matthew Wild <mwild1@gmail.com>
parents: 2519
diff changeset
205
947
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
206 return action_handlers;