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annotate mod_firewall/conditions.lib.lua @ 2044:06faf7a149e3

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mod_poke_strangers: Log details about JIDs that look like they are spamming.
author Thijs Alkemade <me@thijsalkema.de>
date Fri, 05 Feb 2016 11:23:13 +0100
parents 7ba6ed553c93
children 2356114ff505
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1 local condition_handlers = {};
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2
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3 local jid = require "util.jid";
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4
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5 -- Return a code string for a condition that checks whether the contents
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6 -- of variable with the name 'name' matches any of the values in the
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7 -- comma/space/pipe delimited list 'values'.
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8 local function compile_comparison_list(name, values)
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9 local conditions = {};
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10 for value in values:gmatch("[^%s,|]+") do
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11 table.insert(conditions, ("%s == %q"):format(name, value));
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12 end
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13 return table.concat(conditions, " or ");
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14 end
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15
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16 function condition_handlers.KIND(kind)
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17 return compile_comparison_list("name", kind), { "name" };
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18 end
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19
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20 local wildcard_equivs = { ["*"] = ".*", ["?"] = "." };
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21
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22 local function compile_jid_match_part(part, match)
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23 if not match then
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24 return part.." == nil"
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25 end
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26 local pattern = match:match("<(.*)>");
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27 if pattern then
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28 if pattern == "*" then
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29 return part;
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30 end
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31 if pattern:match("^<.*>$") then
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32 pattern = pattern:match("^<(.*)>$");
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33 else
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34 pattern = pattern:gsub("%p", "%%%0"):gsub("%%(%p)", wildcard_equivs);
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35 end
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36 return ("%s:match(%q)"):format(part, "^"..pattern.."$");
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37 else
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38 return ("%s == %q"):format(part, match);
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39 end
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40 end
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41
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42 local function compile_jid_match(which, match_jid)
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43 local match_node, match_host, match_resource = jid.split(match_jid);
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44 local conditions = {};
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45 conditions[#conditions+1] = compile_jid_match_part(which.."_node", match_node);
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46 conditions[#conditions+1] = compile_jid_match_part(which.."_host", match_host);
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47 if match_resource then
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48 conditions[#conditions+1] = compile_jid_match_part(which.."_resource", match_resource);
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49 end
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50 return table.concat(conditions, " and ");
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51 end
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52
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53 function condition_handlers.TO(to)
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54 return compile_jid_match("to", to), { "split_to" };
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55 end
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56
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57 function condition_handlers.FROM(from)
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58 return compile_jid_match("from", from), { "split_from" };
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59 end
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60
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61 function condition_handlers.FROM_EXACTLY(from)
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62 return ("from == %q"):format(from), { "from" };
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63 end
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64
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65 function condition_handlers.TO_EXACTLY(to)
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66 return ("to == %q"):format(to), { "to" };
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67 end
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68
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69 function condition_handlers.TYPE(type)
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70 return compile_comparison_list("(type or (name == 'message' and 'normal') or (name == 'presence' and 'available'))", type), { "type", "name" };
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71 end
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73 local function zone_check(zone, which)
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74 local which_not = which == "from" and "to" or "from";
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75 return ("(zone_%s[%s_host] or zone_%s[%s] or zone_%s[bare_%s]) "
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76 .."and not(zone_%s[%s_host] or zone_%s[%s] or zone_%s[%s])"
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77 )
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78 :format(zone, which, zone, which, zone, which,
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79 zone, which_not, zone, which_not, zone, which_not), {
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80 "split_to", "split_from", "bare_to", "bare_from", "zone:"..zone
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81 };
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82 end
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83
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84 function condition_handlers.ENTERING(zone)
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85 return zone_check(zone, "to");
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86 end
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87
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88 function condition_handlers.LEAVING(zone)
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89 return zone_check(zone, "from");
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90 end
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91
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92 function condition_handlers.PAYLOAD(payload_ns)
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93 return ("stanza:get_child(nil, %q)"):format(payload_ns);
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94 end
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95
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96 function condition_handlers.INSPECT(path)
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97 if path:find("=") then
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98 local path, match = path:match("(.-)=(.*)");
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99 return ("stanza:find(%q) == %q"):format(path, match);
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100 end
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101 return ("stanza:find(%q)"):format(path);
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102 end
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103
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104 function condition_handlers.FROM_GROUP(group_name)
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105 return ("group_contains(%q, bare_from)"):format(group_name), { "group_contains", "bare_from" };
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106 end
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107
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108 function condition_handlers.TO_GROUP(group_name)
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109 return ("group_contains(%q, bare_to)"):format(group_name), { "group_contains", "bare_to" };
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110 end
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111
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112 function condition_handlers.FROM_ADMIN_OF(host)
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113 return ("is_admin(bare_from, %s)"):format(host ~= "*" and host or nil), { "is_admin", "bare_from" };
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114 end
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115
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116 function condition_handlers.TO_ADMIN_OF(host)
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117 return ("is_admin(bare_to, %s)"):format(host ~= "*" and host or nil), { "is_admin", "bare_to" };
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118 end
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119
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120 local day_numbers = { sun = 0, mon = 2, tue = 3, wed = 4, thu = 5, fri = 6, sat = 7 };
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121
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122 local function current_time_check(op, hour, minute)
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123 hour, minute = tonumber(hour), tonumber(minute);
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124 local adj_op = op == "<" and "<" or ">="; -- Start time inclusive, end time exclusive
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125 if minute == 0 then
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126 return "(current_hour"..adj_op..hour..")";
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127 else
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128 return "((current_hour"..op..hour..") or (current_hour == "..hour.." and current_minute"..adj_op..minute.."))";
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129 end
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130 end
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131
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132 local function resolve_day_number(day_name)
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133 return assert(day_numbers[day_name:sub(1,3):lower()], "Unknown day name: "..day_name);
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134 end
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135
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136 function condition_handlers.DAY(days)
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137 local conditions = {};
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138 for day_range in days:gmatch("[^,]+") do
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139 local day_start, day_end = day_range:match("(%a+)%s*%-%s*(%a+)");
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140 if day_start and day_end then
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141 local day_start_num, day_end_num = resolve_day_number(day_start), resolve_day_number(day_end);
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142 local op = "and";
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143 if day_end_num < day_start_num then
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144 op = "or";
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145 end
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146 table.insert(conditions, ("current_day >= %d %s current_day <= %d"):format(day_start_num, op, day_end_num));
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147 elseif day_range:match("%a") then
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148 local day = resolve_day_number(day_range:match("%a+"));
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149 table.insert(conditions, "current_day == "..day);
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150 else
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151 error("Unable to parse day/day range: "..day_range);
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152 end
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153 end
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154 assert(#conditions>0, "Expected a list of days or day ranges");
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155 return "("..table.concat(conditions, ") or (")..")", { "time:day" };
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156 end
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157
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158 function condition_handlers.TIME(ranges)
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159 local conditions = {};
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160 for range in ranges:gmatch("([^,]+)") do
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161 local clause = {};
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162 range = range:lower()
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163 :gsub("(%d+):?(%d*) *am", function (h, m) return tostring(tonumber(h)%12)..":"..(tonumber(m) or "00"); end)
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164 :gsub("(%d+):?(%d*) *pm", function (h, m) return tostring(tonumber(h)%12+12)..":"..(tonumber(m) or "00"); end);
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165 local start_hour, start_minute = range:match("(%d+):(%d+) *%-");
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166 local end_hour, end_minute = range:match("%- *(%d+):(%d+)");
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167 local op = tonumber(start_hour) > tonumber(end_hour) and " or " or " and ";
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168 if start_hour and end_hour then
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169 table.insert(clause, current_time_check(">", start_hour, start_minute));
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170 table.insert(clause, current_time_check("<", end_hour, end_minute));
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171 end
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172 if #clause == 0 then
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173 error("Unable to parse time range: "..range);
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174 end
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175 table.insert(conditions, "("..table.concat(clause, " "..op.." ")..")");
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176 end
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177 return table.concat(conditions, " or "), { "time:hour,min" };
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178 end
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179
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180 function condition_handlers.LIMIT(name)
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181 return ("not throttle_%s:poll(1)"):format(name), { "throttle:"..name };
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182 end
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183
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c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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184 return condition_handlers;