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Add an internal version of pcap_open_live that ensures bpf(4) devices
are opened read-only before locking. Neither pflogd(8) or spamlogd(8)
require write access to bpf(4). Inspired by similar solution in
OpenBSD tcpdump(8).
pflogd(8) was safe since being unveiled last year, but spamlogd(8)
was having /dev/bpf opened O_RDWR.
Issue discovered by bluhm@'s unveil(2) accounting commit.
ok deraadt@, mestre@ (thanks for testing spamlogd!)
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OK deraadt@ millert@ jca@
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with backwards compatibility for records with 32-bit times.
OK deraadt@ beck@
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This adds an HMAC protected synchronization protocol for use by spamd and
spamlogd.
- spamd can receive updates from other hosts for GREY, WHITE, and TRAPPED db
entries, and will update the local /var/db/spamd accordingly.
- spamd can send updates when it makes changes to the GREY or TRAPPED
entries in the db to other hosts running spamd. (Note it does not send
WHITE entries because the other spamd will see the GREY changes and have
complete information to make appropritate decisions)
- spamlogd can send updates for WHITE db entries that it performs on the local
db to other hosts running spamd, which will then apply them on remote hosts.
note that while this diff provides synchronization for changes made to the
spamd db by the daemons, it does *not* provide for sychonizing changes
to the spamd db made manually with the spamdb command.
Synchronization protocol and most of the work by reyk@,
with a bunch of the spamd, and spamlogd stuff by me.
testing mostly at the U of A, running happily there under big load.
ok reyk@ jmc@
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joint work with Berk D. Demir, ok beck deraadt
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ok deraadt@
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originates from a paper by Evan Harris which can be found at
http://projects.puremagic.com/greylisting/. This implementation makes
spamd allow for non-blacklisted addresses to be treated as "greylisted".
where they are tracked in a db file, and whitelisted by addition to a
pf table when the same envelope from and to are retried from the same
source IP address. Testing by many, ok deraadt@
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