mod_firewall/conditions: Support Lua patterns in JID matching, and make <*>@example.com NOT match example.com
local condition_handlers = {};
local jid = require "util.jid";
-- Return a code string for a condition that checks whether the contents
-- of variable with the name 'name' matches any of the values in the
-- comma/space/pipe delimited list 'values'.
local function compile_comparison_list(name, values)
local conditions = {};
for value in values:gmatch("[^%s,|]+") do
table.insert(conditions, ("%s == %q"):format(name, value));
end
return table.concat(conditions, " or ");
end
function condition_handlers.KIND(kind)
return compile_comparison_list("name", kind), { "name" };
end
local wildcard_equivs = { ["*"] = ".*", ["?"] = "." };
local function compile_jid_match_part(part, match)
if not match then
return part.." == nil"
end
local pattern = match:match("<(.*)>");
if pattern then
if pattern == "*" then
return part;
end
if pattern:match("^<.*>$") then
pattern = pattern:match("^<(.*)>$");
else
pattern = pattern:gsub("%p", "%%%0"):gsub("%%(%p)", wildcard_equivs);
end
return ("%s:match(%q)"):format(part, "^"..pattern.."$");
else
return ("%s == %q"):format(part, match);
end
end
local function compile_jid_match(which, match_jid)
local match_node, match_host, match_resource = jid.split(match_jid);
local conditions = {
compile_jid_match_part(which.."_node", match_node);
compile_jid_match_part(which.."_host", match_host);
match_resource and compile_jid_match_part(which.."_resource", match_resource) or nil;
};
return table.concat(conditions, " and ");
end
function condition_handlers.TO(to)
return compile_jid_match("to", to), { "split_to" };
end
function condition_handlers.FROM(from)
return compile_jid_match("from", from), { "split_from" };
end
function condition_handlers.TYPE(type)
return compile_comparison_list("type", type), { "type" };
end
function condition_handlers.ENTERING(zone)
return ("(zones[%q] and (zones[%q][to_host] or "
.."zones[%q][to] or "
.."zones[%q][bare_to]))"
)
:format(zone, zone, zone, zone), { "split_to", "bare_to" };
end
function condition_handlers.LEAVING(zone)
return ("zones[%q] and (zones[%q][from_host] or "
.."(zones[%q][from] or "
.."zones[%q][bare_from]))")
:format(zone, zone, zone, zone), { "split_from", "bare_from" };
end
function condition_handlers.PAYLOAD(payload_ns)
return ("stanza:get_child(nil, %q)"):format(payload_ns);
end
function condition_handlers.INSPECT(path)
if path:find("=") then
local path, match = path:match("(.-)=(.*)");
return ("stanza:find(%q) == %q"):format(path, match);
end
return ("stanza:find(%q)"):format(path);
end
function condition_handlers.FROM_GROUP(group_name)
return ("group_contains(%q, bare_from)"):format(group_name), { "group_contains", "bare_from" };
end
function condition_handlers.TO_GROUP(group_name)
return ("group_contains(%q, bare_to)"):format(group_name), { "group_contains", "bare_to" };
end
function condition_handlers.FROM_ADMIN_OF(host)
return ("is_admin(bare_from, %s)"):format(host ~= "*" and host or nil), { "is_admin", "bare_from" };
end
function condition_handlers.TO_ADMIN_OF(host)
return ("is_admin(bare_to, %s)"):format(host ~= "*" and host or nil), { "is_admin", "bare_to" };
end
return condition_handlers;