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--[[
Copyright (c) 2011-2015, Vsevolod Stakhov <vsevolod@highsecure.ru>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
]]--
-- Phishing detection interface for selecting phished urls and inserting corresponding symbol
--
--
local symbol = 'PHISHED_URL'
local domains = nil
local strict_domains = {}
local redirector_domains = {}
local rspamd_logger = require "rspamd_logger"
local util = require "rspamd_util"
local opts = rspamd_config:get_all_opt('phishing')
local function phishing_cb(task)
local urls = task:get_urls()
if urls then
for _,url in ipairs(urls) do
if url:is_phished() then
local found = false
local purl = url:get_phished()
local tld = url:get_tld()
local ptld = purl:get_tld()
if not ptld or not tld then
return
end
local weight = 1.0
local dist = util.levenshtein_distance(tld, ptld)
dist = 2 * dist / (#tld + #ptld)
if dist > 0.3 and dist <= 1.0 then
-- Use distance to penalize the total weight
weight = util.tanh(3 * (1 - dist + 0.1))
end
rspamd_logger.debugx(task, "distance: %1 -> %2: %3", tld, ptld, dist)
if #redirector_domains > 0 then
for _,rule in ipairs(redirector_domains) do
if rule['map']:get_key(url:get_tld()) then
task:insert_result(rule['symbol'], weight, ptld)
found = true
end
end
end
if not found and #strict_domains > 0 then
for _,rule in ipairs(strict_domains) do
if rule['map']:get_key(ptld) then
task:insert_result(rule['symbol'], 1.0, ptld)
found = true
end
end
end
if not found then
if domains then
if domains:get_key(ptld) then
task:insert_result(symbol, weight, ptld)
end
else
task:insert_result(symbol, weight, ptld)
end
end
end
end
end
end
local function phishing_map(mapname, phishmap)
if opts[mapname] then
local xd = {}
if type(opts[mapname]) == 'table' then
xd = opts[mapname]
else
xd[1] = opts[mapname]
end
for _,d in ipairs(xd) do
local s, _ = string.find(d, ':[^:]+$')
if s then
local sym = string.sub(d, s + 1, -1)
local map = string.sub(d, 1, s - 1)
rspamd_config:register_virtual_symbol(sym, 1, id)
local rmap = rspamd_config:add_hash_map (map, 'Phishing ' .. mapname .. ' map')
if rmap then
local rule = {symbol = sym, map = rmap}
table.insert(phishmap, rule)
else
rspamd_logger.infox(rspamd_config, 'cannot add map: ' .. map .. ' for symbol: ' .. sym)
end
else
rspamd_logger.infox(rspamd_config, mapname .. ' option must be in format <map>:<symbol>')
end
end
end
end
-- Registration
if type(rspamd_config.get_api_version) ~= 'nil' then
if rspamd_config:get_api_version() >= 1 then
rspamd_config:register_module_option('phishing', 'symbol', 'string')
rspamd_config:register_module_option('phishing', 'domains', 'map')
rspamd_config:register_module_option('phishing', 'strict_domains', 'string')
rspamd_config:register_module_option('phishing', 'redirector_domains', 'string')
end
end
if opts then
if opts['symbol'] then
symbol = opts['symbol']
-- Register symbol's callback
rspamd_config:register_symbol(symbol, 1.0, phishing_cb)
end
if opts['domains'] and type(opt['domains']) == 'string' then
domains = rspamd_config:add_hash_map (opts['domains'])
end
phishing_map('strict_domains', strict_domains)
phishing_map('redirector_domains', redirector_domains)
end
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