annotate mod_firewall/conditions.lib.lua @ 965:d4e24fb289c0

mod_firewall: Improve zone handling, make it more efficient, and support dynamic dependencies in the compiler. ENTERING and LEAVING conditions now work at expected (not matching stanzas flowing within a zone).
author Matthew Wild <mwild1@gmail.com>
date Fri, 05 Apr 2013 19:21:46 +0100
parents 04e85eb3dfef
children f3b0ddeebd9d
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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.TYPE(type)
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62 return compile_comparison_list("(type or (name == 'message' and 'chat') or (name == 'presence' and 'available'))", type), { "type", "name" };
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63 end
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64
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65 local function zone_check(zone, which)
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66 local which_not = which == "from" and "to" or "from";
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67 return ("(zone_%s[%s_host] or zone_%s[%s] or zone_%s[bare_%s]) "
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68 .."and not(zone_%s[%s_host] or zone_%s[%s] or zone_%s[%s])"
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69 )
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70 :format(zone, which, zone, which, zone, which,
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71 zone, which_not, zone, which_not, zone, which_not), {
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72 "split_to", "split_from", "bare_to", "bare_from", "zone:"..zone
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73 };
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74 end
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75
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76 function condition_handlers.ENTERING(zone)
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77 return zone_check(zone, "to");
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78 end
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79
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80 function condition_handlers.LEAVING(zone)
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81 return zone_check(zone, "from");
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82 end
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83
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84 function condition_handlers.PAYLOAD(payload_ns)
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85 return ("stanza:get_child(nil, %q)"):format(payload_ns);
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86 end
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87
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88 function condition_handlers.INSPECT(path)
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89 if path:find("=") then
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90 local path, match = path:match("(.-)=(.*)");
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91 return ("stanza:find(%q) == %q"):format(path, match);
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92 end
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93 return ("stanza:find(%q)"):format(path);
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94 end
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95
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96 function condition_handlers.FROM_GROUP(group_name)
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97 return ("group_contains(%q, bare_from)"):format(group_name), { "group_contains", "bare_from" };
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98 end
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99
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100 function condition_handlers.TO_GROUP(group_name)
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101 return ("group_contains(%q, bare_to)"):format(group_name), { "group_contains", "bare_to" };
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102 end
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103
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104 function condition_handlers.FROM_ADMIN_OF(host)
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105 return ("is_admin(bare_from, %s)"):format(host ~= "*" and host or nil), { "is_admin", "bare_from" };
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106 end
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107
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108 function condition_handlers.TO_ADMIN_OF(host)
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109 return ("is_admin(bare_to, %s)"):format(host ~= "*" and host or nil), { "is_admin", "bare_to" };
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110 end
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111
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112 return condition_handlers;