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-- Plugin for comparing smtp dialog recipients and sender with recipients and sender
-- in mime headers
local symbol_rcpt = 'FORGED_RECIPIENTS'
local symbol_sender = 'FORGED_SENDER'
function check_forged_headers(task)
local msg = task:get_message()
local smtp_rcpt = task:get_recipients()
local res = false
if smtp_rcpt then
local mime_rcpt = msg:get_header('To')
local mime_cc = msg:get_header('Cc')
local count = 0
if mime_rcpt then
count = table.maxn(mime_rcpt)
end
if mime_cc then
count = count + table.maxn(mime_cc)
end
-- Check recipients count
if count < table.maxn(smtp_rcpt) then
task:insert_result(symbol_rcpt, 1)
else
-- Find pair for each smtp recipient recipient in To or Cc headers
for _,sr in ipairs(smtp_rcpt) do
if sr:sub(1,1) == '<' then
-- Trim brackets
sr = string.sub(sr, 2, -2)
end
if mime_rcpt then
for _,mr in ipairs(mime_rcpt) do
if string.find(mr, sr) then
res = true
break
end
end
end
if mime_cc then
for _,mr in ipairs(mime_cc) do
if string.find(mr, sr) then
res = true
break
end
end
end
if not res then
task:insert_result(symbol_rcpt, 1)
break
end
end
end
end
-- Check sender
local smtp_from = task:get_from()
if smtp_form then
local mime_from = msg:get_header('From')
if not mime_from or not string.find(mime_from[0], smtp_from) then
task:insert_result(symbol_sender, 1)
end
end
end
-- Configuration
local opts = rspamd_config:get_all_opt('forged_recipients')
if opts then
if opts['symbol_rcpt'] or opts['symbol_sender'] then
if opts['symbol_rcpt'] then
symbol_rcpt = opts['symbol_rcpt']
end
if opts['symbol_sender'] then
symbol_sender = opts['symbol_sender']
end
rspamd_config:register_symbol(symbol_rcpt, 1.0, 'check_forged_headers')
end
end
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