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mod_firewall/conditions.lib.lua

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mod_firewall/conditions.lib.lua @ 2126:b0d711cd3da5

mod_firewall: Fix syntax error
author Matthew Wild <mwild1@gmail.com>
date Thu, 17 Mar 2016 21:30:09 +0000
parent 2125:edf5cf3c474b
child 2127:59023dffbdd4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2125
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 condition_handlers = {};
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3
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4 local jid = require "util.jid";
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5
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6 -- Return a code string for a condition that checks whether the contents
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7 -- of variable with the name 'name' matches any of the values in the
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8 -- comma/space/pipe delimited list 'values'.
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9 local function compile_comparison_list(name, values)
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10 local conditions = {};
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11 for value in values:gmatch("[^%s,|]+") do
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12 table.insert(conditions, ("%s == %q"):format(name, value));
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13 end
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14 return table.concat(conditions, " or ");
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15 end
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16
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17 function condition_handlers.KIND(kind)
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18 return compile_comparison_list("name", kind), { "name" };
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19 end
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20
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21 local wildcard_equivs = { ["*"] = ".*", ["?"] = "." };
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22
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23 local function compile_jid_match_part(part, match)
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24 if not match then
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25 return part.." == nil";
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26 end
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27 local pattern = match:match("^<(.*)>$");
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28 if pattern then
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29 if pattern == "*" then
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30 return part;
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31 end
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32 if pattern:find("^<.*>$") then
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33 pattern = pattern:match("^<(.*)>$");
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34 else
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35 pattern = pattern:gsub("%p", "%%%0"):gsub("%%(%p)", wildcard_equivs);
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36 end
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37 return ("(%s and %s:find(%q))"):format(part, part, "^"..pattern.."$");
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38 else
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39 return ("%s == %q"):format(part, match);
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40 end
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41 end
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42
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43 local function compile_jid_match(which, match_jid)
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44 local match_node, match_host, match_resource = jid.split(match_jid);
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45 local conditions = {};
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46 conditions[#conditions+1] = compile_jid_match_part(which.."_node", match_node);
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47 conditions[#conditions+1] = compile_jid_match_part(which.."_host", match_host);
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48 if match_resource then
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49 conditions[#conditions+1] = compile_jid_match_part(which.."_resource", match_resource);
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50 end
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51 return table.concat(conditions, " and ");
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52 end
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53
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54 function condition_handlers.TO(to)
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55 return compile_jid_match("to", to), { "split_to" };
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56 end
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57
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58 function condition_handlers.FROM(from)
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59 return compile_jid_match("from", from), { "split_from" };
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60 end
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61
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62 function condition_handlers.FROM_EXACTLY(from)
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63 return ("from == %q"):format(from), { "from" };
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64 end
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65
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66 function condition_handlers.TO_EXACTLY(to)
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67 return ("to == %q"):format(to), { "to" };
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68 end
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69
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70 function condition_handlers.TYPE(type)
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71 return compile_comparison_list("(type or (name == 'message' and 'normal') or (name == 'presence' and 'available'))", type), { "type", "name" };
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72 end
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74 local function zone_check(zone, which)
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75 local which_not = which == "from" and "to" or "from";
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76 return ("(zone_%s[%s_host] or zone_%s[%s] or zone_%s[bare_%s]) "
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77 .."and not(zone_%s[%s_host] or zone_%s[%s] or zone_%s[bare_%s])"
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78 )
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79 :format(zone, which, zone, which, zone, which,
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80 zone, which_not, zone, which_not, zone, which_not), {
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81 "split_to", "split_from", "bare_to", "bare_from", "zone:"..zone
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82 };
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83 end
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84
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85 function condition_handlers.ENTERING(zone)
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86 return zone_check(zone, "to");
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87 end
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88
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89 function condition_handlers.LEAVING(zone)
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90 return zone_check(zone, "from");
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91 end
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92
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93 function condition_handlers.PAYLOAD(payload_ns)
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94 return ("stanza:get_child(nil, %q)"):format(payload_ns);
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95 end
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96
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97 function condition_handlers.INSPECT(path)
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98 if path:find("=") then
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99 local query, is_pattern_match, value = path:match("(.-)(~?)=(.*)");
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100 if is_pattern_match ~= "" then
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101 return ("stanza:find(%q):match(%q)"):format(path:match("(.-)~=(.*)"));
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102 else
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103 return ("stanza:find(%q) == %q"):format(path:match("(.-)=(.*)"));
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104 end
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105 end
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106 return ("stanza:find(%q)"):format(path);
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107 end
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108
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109 function condition_handlers.FROM_GROUP(group_name)
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110 return ("group_contains(%q, bare_from)"):format(group_name), { "group_contains", "bare_from" };
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111 end
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112
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113 function condition_handlers.TO_GROUP(group_name)
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114 return ("group_contains(%q, bare_to)"):format(group_name), { "group_contains", "bare_to" };
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115 end
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116
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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117 function condition_handlers.FROM_ADMIN_OF(host)
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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118 return ("is_admin(bare_from, %s)"):format(host ~= "*" and host or nil), { "is_admin", "bare_from" };
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119 end
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120
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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121 function condition_handlers.TO_ADMIN_OF(host)
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122 return ("is_admin(bare_to, %s)"):format(host ~= "*" and host or nil), { "is_admin", "bare_to" };
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123 end
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124
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125 local day_numbers = { sun = 0, mon = 2, tue = 3, wed = 4, thu = 5, fri = 6, sat = 7 };
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126
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127 local function current_time_check(op, hour, minute)
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128 hour, minute = tonumber(hour), tonumber(minute);
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129 local adj_op = op == "<" and "<" or ">="; -- Start time inclusive, end time exclusive
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130 if minute == 0 then
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131 return "(current_hour"..adj_op..hour..")";
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132 else
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133 return "((current_hour"..op..hour..") or (current_hour == "..hour.." and current_minute"..adj_op..minute.."))";
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134 end
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135 end
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136
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137 local function resolve_day_number(day_name)
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138 return assert(day_numbers[day_name:sub(1,3):lower()], "Unknown day name: "..day_name);
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139 end
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140
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141 function condition_handlers.DAY(days)
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142 local conditions = {};
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143 for day_range in days:gmatch("[^,]+") do
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144 local day_start, day_end = day_range:match("(%a+)%s*%-%s*(%a+)");
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145 if day_start and day_end then
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146 local day_start_num, day_end_num = resolve_day_number(day_start), resolve_day_number(day_end);
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147 local op = "and";
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148 if day_end_num < day_start_num then
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149 op = "or";
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150 end
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151 table.insert(conditions, ("current_day >= %d %s current_day <= %d"):format(day_start_num, op, day_end_num));
2070
2356114ff505 mod_firewall: Optimize string match operations, string.find is faster than .match since no string is returned
Kim Alvefur <zash@zash.se>
parents: 2036
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152 elseif day_range:find("%a") then
968
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153 local day = resolve_day_number(day_range:match("%a+"));
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154 table.insert(conditions, "current_day == "..day);
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155 else
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156 error("Unable to parse day/day range: "..day_range);
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157 end
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158 end
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159 assert(#conditions>0, "Expected a list of days or day ranges");
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160 return "("..table.concat(conditions, ") or (")..")", { "time:day" };
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161 end
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162
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
Matthew Wild <mwild1@gmail.com>
parents: 965
diff changeset
163 function condition_handlers.TIME(ranges)
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
Matthew Wild <mwild1@gmail.com>
parents: 965
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164 local conditions = {};
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
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parents: 965
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165 for range in ranges:gmatch("([^,]+)") do
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
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diff changeset
166 local clause = {};
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
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parents: 965
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167 range = range:lower()
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
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parents: 965
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168 :gsub("(%d+):?(%d*) *am", function (h, m) return tostring(tonumber(h)%12)..":"..(tonumber(m) or "00"); end)
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parents: 965
diff changeset
169 :gsub("(%d+):?(%d*) *pm", function (h, m) return tostring(tonumber(h)%12+12)..":"..(tonumber(m) or "00"); end);
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
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parents: 965
diff changeset
170 local start_hour, start_minute = range:match("(%d+):(%d+) *%-");
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
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parents: 965
diff changeset
171 local end_hour, end_minute = range:match("%- *(%d+):(%d+)");
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parents: 965
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172 local op = tonumber(start_hour) > tonumber(end_hour) and " or " or " and ";
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parents: 965
diff changeset
173 if start_hour and end_hour then
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parents: 965
diff changeset
174 table.insert(clause, current_time_check(">", start_hour, start_minute));
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
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parents: 965
diff changeset
175 table.insert(clause, current_time_check("<", end_hour, end_minute));
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
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parents: 965
diff changeset
176 end
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Matthew Wild <mwild1@gmail.com>
parents: 965
diff changeset
177 if #clause == 0 then
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parents: 965
diff changeset
178 error("Unable to parse time range: "..range);
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
Matthew Wild <mwild1@gmail.com>
parents: 965
diff changeset
179 end
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
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parents: 965
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180 table.insert(conditions, "("..table.concat(clause, " "..op.." ")..")");
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
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parents: 965
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181 end
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
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parents: 965
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182 return table.concat(conditions, " or "), { "time:hour,min" };
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
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parents: 965
diff changeset
183 end
f3b0ddeebd9d mod_firewall/conditions: Add DAY and TIME conditions
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parents: 965
diff changeset
184
971
53e158e44a44 mod_firewall: Add rate limiting capabilities, and keep zones and throttle objects in shared tables
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parents: 968
diff changeset
185 function condition_handlers.LIMIT(name)
53e158e44a44 mod_firewall: Add rate limiting capabilities, and keep zones and throttle objects in shared tables
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parents: 968
diff changeset
186 return ("not throttle_%s:poll(1)"):format(name), { "throttle:"..name };
53e158e44a44 mod_firewall: Add rate limiting capabilities, and keep zones and throttle objects in shared tables
Matthew Wild <mwild1@gmail.com>
parents: 968
diff changeset
187 end
53e158e44a44 mod_firewall: Add rate limiting capabilities, and keep zones and throttle objects in shared tables
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parents: 968
diff changeset
188
2107
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
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parents: 2075
diff changeset
189 function condition_handlers.ORIGIN_MARKED(name_and_time)
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
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parents: 2075
diff changeset
190 local name, time = name_and_time:match("^%s*(%w+)%s+%(([^)]+)s%)%s*$");
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2075
diff changeset
191 if not name then
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2075
diff changeset
192 name = name_and_time:match("^%s*(%w+)%s*$");
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2075
diff changeset
193 end
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2075
diff changeset
194 if not name then
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2075
diff changeset
195 error("Error parsing mark name, see documentation for usage examples");
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2075
diff changeset
196 end
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2075
diff changeset
197 if time then
2116
2bb42ba342f3 mod_firewall: Fix usage of incorrect variable current_time in ORIGIN_MARKED condition (thanks Ge0rG)
Matthew Wild <mwild1@gmail.com>
parents: 2109
diff changeset
198 return ("(current_timestamp - (session.firewall_marked_%s or 0)) < %d"):format(idsafe(name), tonumber(time)), { "timestamp" };
2107
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
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parents: 2075
diff changeset
199 end
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2075
diff changeset
200 return ("not not session.firewall_marked_"..idsafe(name));
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2075
diff changeset
201 end
f445f43b9ba1 mod_firewall: Add support for session marking (MARK_ORIGIN, UNMARK_ORIGIN, ORIGIN_MARKED)
Matthew Wild <mwild1@gmail.com>
parents: 2075
diff changeset
202
947
c91cac3b823f mod_firewall: General stanza filtering plugin with a declarative rule-based syntax
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parents:
diff changeset
203 return condition_handlers;