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--[[
Copyright (c) 2016, Vsevolod Stakhov <vsevolod@highsecure.ru>
Copyright (c) 2016, Andrew Lewis <nerf@judo.za.org>
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.
]]--
-- A plugin that implements replies check using redis
-- Default port for redis upstreams
local default_port = 6379
local upstreams
local whitelisted_ip
local settings = {
action = nil,
expire = 86400, -- 1 day by default
key_prefix = 'rr',
message = 'Message is reply to one we originated',
symbol = 'REPLY',
}
local rspamd_logger = require 'rspamd_logger'
local rspamd_redis = require 'rspamd_redis'
local upstream_list = require 'rspamd_upstream_list'
local hash = require 'rspamd_cryptobox_hash'
local function make_key(goop)
local h = hash.create()
h:update(goop)
local key = h:base32()
key = settings['key_prefix'] .. key
return key
end
local function replies_check(task)
local function redis_get_cb(task, err, data)
if err ~= nil then
rspamd_logger.errx('redis_get_cb received error: %1', err)
return
end
if data == '1' then
-- Hash was found
task:insert_result(settings['symbol'], 0.0)
if settings['action'] ~= nil then
task:set_pre_result(settings['action'], settings['message'])
end
end
end
-- If in-reply-to header not present return
local irt = task:get_header_raw('in-reply-to')
if irt == nil then
return
end
-- Create hash of in-reply-to and query redis
local key = make_key(irt)
local upstream = upstreams:get_upstream_by_hash(key)
local addr = upstream:get_addr()
if not rspamd_redis.make_request({task = task, host = addr, callback = redis_get_cb,
cmd = 'GET', args = {key}}) then
rspamd_logger.errx("redis request wasn't scheduled")
end
end
local function replies_set(task)
local function redis_set_cb(task, err, data)
if err ~=nil then
rspamd_logger.errx('redis_set_cb received error: %1', err)
end
end
-- If sender is unauthenticated return
if task:get_user() == nil then
return
end
-- If no message-id present return
local msg_id = task:get_header_raw('message-id')
if msg_id == nil then
return
end
-- Create hash of message-id and store to redis
local key = make_key(msg_id)
local upstream = upstreams:get_upstream_by_hash(key)
local addr = upstream:get_addr()
if not addr then
rspamd_logger.errx("couldn't get address for upstream")
return
end
if not rspamd_redis.make_request({task = task, host = addr, callback = redis_set_cb,
cmd = 'SET', args = {key, 1, "ex", settings['expire']}}) then
rspamd_logger.errx("redis request wasn't scheduled")
end
end
local opts = rspamd_config:get_all_opt('replies')
if opts then
if not opts['servers'] then
rspamd_logger.infox(rspamd_config, 'no servers are specified, disabling module')
else
upstreams = upstream_list.create(rspamd_config, opts['servers'], default_port)
if not upstreams then
rspamd_logger.infox(rspamd_config, 'no servers are specified, disabling module')
else
rspamd_config:register_pre_filter(replies_check)
rspamd_config:register_post_filter(replies_set, 10)
end
end
for k,v in pairs(opts) do
settings[k] = v
end
end
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