mixandClaude Opus 5.5
1f44e40382
test / test (push) Canceled after 0s
The routine kept the key after its first read. SelfPost makes a new key when the file is lost or damaged, or a backup brings back another, and rspamd would then have gone on signing with the old one - every verdict unrecorded - until someone restarted the sidecar. The file is one short line; reading it per message costs nothing worth keeping a copy for. The guide says what never needs doing: nothing of rspamd's is cleared after a change of the lists or the key; a restart is for a change of its own configuration only. Prompted by the owner's question whether rspamd's cache needs clearing (2026-10-12). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
46 lines
2.0 KiB
Plaintext
46 lines
2.0 KiB
Plaintext
# Mounted into the sidecar as /etc/rspamd/local.d/milter_headers.conf.
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#
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# rspamd writes its verdict into two headers of every message it lets through:
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# the action it chose and the score with the symbols behind it. SelfPost's
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# inbound journal reads them (Inbound > Log shows them next to the message),
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# and the upstream mailbox server receives them with the mail.
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#
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# rspamd removes headers of these names that a sender wrote himself before it
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# adds its own. Without this file the journal still lists accepted mail, with
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# no verdict next to it.
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#
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# The third header is the proof that the other two are rspamd's. The filter is
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# attached so that mail still flows when it is down, and then nothing removes
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# what a sender wrote: he could send his own verdict. So rspamd signs each
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# message - an HMAC-SHA256 of the message's queue id under a key SelfPost
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# generates and leaves in the directory it shares with this container - and
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# SelfPost reads a verdict only next to a signature it can recompute. The
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# signature travels on with the mail and is of no use to whoever sees it: it
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# fits that one queue id.
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use = ["x-spamd-result", "x-rspamd-action", "selfpost-signature"];
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custom {
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selfpost-signature = <<EOD
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return function(task, common_meta)
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local remove = { ['X-SelfPost-Filter'] = 0 }
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-- The key is read for every message and kept nowhere: SelfPost may make a
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-- new one (the file was lost, a backup was restored), and a key remembered
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-- here would go on signing what SelfPost no longer accepts until someone
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-- restarted this container. The file is one short line.
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local key
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local f = io.open('/etc/rspamd/selfpost/filter.key', 'r')
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if f then
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key = f:read('*l')
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f:close()
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end
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local qid = task:get_queue_id()
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if not key or key == '' or not qid or qid == '' then
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return nil, {}, remove, {}
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end
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local hash = require "rspamd_cryptobox_hash"
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local sig = hash.create_specific_keyed(key, 'sha256', qid):hex()
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return nil, { ['X-SelfPost-Filter'] = sig }, remove, {}
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end
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EOD;
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}
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