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--[[
Copyright (c) 2016, Andrew Lewis <nerf@judo.za.org>
Copyright (c) 2017, Vsevolod Stakhov <vsevolod@highsecure.ru>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
]]--
local global = require "global_functions"
local rspamd_util = require "rspamd_util"
local default_settings = {
spf_symbols = {
pass = 'R_SPF_ALLOW',
fail = 'R_SPF_FAIL',
softfail = 'R_SPF_SOFTFAIL',
neutral = 'R_SPF_NEUTRAL',
temperror = 'R_SPF_DNSFAIL',
none = 'R_SPF_NA',
permerror = 'R_SPF_PERMFAIL',
},
dkim_symbols = {
pass = 'R_DKIM_ALLOW',
fail = 'R_DKIM_REJECT',
temperror = 'R_DKIM_TEMPFAIL',
none = 'R_DKIM_NA',
permerror = 'R_DKIM_PERMFAIL',
},
dmarc_symbols = {
pass = 'DMARC_POLICY_ALLOW',
permerror = 'DMARC_BAD_POLICY',
temperror = 'DMARC_DNSFAIL',
none = 'DMARC_NA',
reject = 'DMARC_POLICY_REJECT',
softfail = 'DMARC_POLICY_SOFTFAIL',
quarantine = 'DMARC_POLICY_QUARANTINE',
},
arc_symbols = {
pass = 'ARC_ALLOW',
permerror = 'ARC_INVALID',
temperror = 'ARC_DNSFAIL',
none = 'ARC_NA',
reject = 'ARC_REJECT',
},
add_smtp_user = true,
}
local exports = {}
local local_hostname = rspamd_util.get_hostname()
local function gen_auth_results(task, settings)
local auth_results, hdr_parts = {}, {}
if not settings then
settings = default_settings
end
local auth_types = {
dkim = settings.dkim_symbols,
dmarc = settings.dmarc_symbols,
spf = settings.spf_symbols,
arc = settings.arc_symbols,
}
local common = {
symbols = {}
}
local mta_hostname = task:get_request_header('MTA-Name') or
task:get_request_header('MTA-Tag')
if mta_hostname then
table.insert(hdr_parts, tostring(mta_hostname))
else
table.insert(hdr_parts, local_hostname)
end
for auth_type, symbols in pairs(auth_types) do
for key, sym in pairs(symbols) do
if not common.symbols.sym then
local s = task:get_symbol(sym)
if not s then
common.symbols[sym] = false
else
common.symbols[sym] = s
if not auth_results[auth_type] then
auth_results[auth_type] = {key}
else
table.insert(auth_results[auth_type], key)
end
if auth_type ~= 'dkim' then
break
end
end
end
end
end
for auth_type, keys in pairs(auth_results) do
for _, key in ipairs(keys) do
local hdr = ''
if auth_type == 'dmarc' and key ~= 'none' then
local opts = common.symbols[auth_types['dmarc'][key]][1]['options'] or {}
hdr = hdr .. 'dmarc='
if key == 'reject' or key == 'quarantine' or key == 'softfail' then
hdr = hdr .. 'fail'
else
hdr = hdr .. key
end
if key == 'pass' then
hdr = hdr .. ' (policy=' .. opts[2] .. ')'
hdr = hdr .. ' header.from=' .. opts[1]
elseif key ~= 'none' then
local t = global.rspamd_str_split(opts[1], ' : ')
local dom = t[1]
local rsn = t[2]
if rsn then
hdr = hdr .. ' reason="' .. rsn .. '"'
end
hdr = hdr .. ' header.from=' .. dom
if key == 'softfail' then
hdr = hdr .. ' (policy=none)'
else
hdr = hdr .. ' (policy=' .. key .. ')'
end
end
table.insert(hdr_parts, hdr)
elseif auth_type == 'dkim' and key ~= 'none' then
if common.symbols[auth_types['dkim'][key]][1] then
local dkim_parts = {}
local opts = common.symbols[auth_types['dkim'][key]][1]['options']
for _, v in ipairs(opts) do
table.insert(dkim_parts, auth_type .. '=' .. key .. ' header.d=' .. v)
end
table.insert(hdr_parts, table.concat(dkim_parts, '; '))
end
elseif auth_type == 'arc' and key ~= 'none' then
if common.symbols[auth_types['arc'][key]][1] then
local opts = common.symbols[auth_types['arc'][key]][1]['options'] or {}
for _, v in ipairs(opts) do
hdr = hdr .. auth_type .. '=' .. key .. ' (' .. v .. ')'
table.insert(hdr_parts, hdr)
end
end
elseif auth_type == 'spf' and key ~= 'none' then
hdr = hdr .. auth_type .. '=' .. key
local smtp_from = task:get_from('smtp')
if smtp_from and smtp_from[1] and smtp_from[1]['addr'] ~= '' and smtp_from[1]['addr'] ~= nil then
hdr = hdr .. ' smtp.mailfrom=' .. smtp_from[1]['addr']
else
local helo = task:get_helo()
if helo then
hdr = hdr .. ' smtp.helo=' .. task:get_helo()
end
end
table.insert(hdr_parts, hdr)
end
end
end
local u = task:get_user()
local smtp_from = task:get_from('smtp')
if u and smtp_from then
local hdr = {[1] = 'auth=pass'}
if settings['add_smtp_user'] then
table.insert(hdr,'smtp.auth=' .. u)
end
if smtp_from[1]['addr'] then
table.insert(hdr,'smtp.mailfrom=' .. smtp_from[1]['addr'])
end
table.insert(hdr_parts, table.concat(hdr,' '))
end
if #hdr_parts > 0 then
return table.concat(hdr_parts, '; ')
end
return nil
end
exports.gen_auth_results = gen_auth_results
return exports
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