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This is important as we don't want the IMAP server baning the webmail,
for instance. (The fail2ban instance running next to the webmail should
ban the attacker, but that running next to the IMAP server shouldn't ban
legit users.)
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For some reason giraff doesn't like IPSec. App-level TLS sessions are
less efficient, but thanks to ansible it still scales well.
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In fact we want to only rewrite the envelope sender:
:/etc/postfix/main.cf
# Overwrite local FQDN envelope sender addresses
sender_canonical_classes = envelope_sender
propagate_unmatched_extensions =
sender_canonical_maps = cdb:$config_directory/sender_canonical
:/etc/postfix/sender_canonical
@elefant.fripost.org admin@fripost.org
However, when canonical(5) processes a mail sent vias sendmail(1), it
rewrites the envelope sender which seems to *later* be use as From:
header.
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Instead, generate a server certificate for each host (on the machine
itself). Then fetch all these certs locally, and copy them over to each
IPSec peer. That requires more certs to be stored on each machines (n
vs 2), but it can be done automatically, and is easier to deploy.
Note: When adding a new machine to the inventory, one needs to run the
playbook on that machine (to generate the cert and fetch it locally)
first, then on all other machines.
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Also, always install contrib's intel-microcode on Intel CPUs.
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E.g., ldap.fripost.org, ntp.fripost.org, etc. (Ideally the DNS zone
would be provisioned by ansible, too.) It's a bit unclear how to index
the subdomains (mx{1,2,3}, etc), though.
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Also, add the 'managesieve' RoundCube plugin to communicate with our
server.
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By using double quoted scalars, cf.
https://groups.google.com/forum/#!topic/ansible-project/ZaB6o-eqDzw
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We use a "master" NTP server, which synchronizes against stratum 1
servers (hence is a stratum 2 itself); all other clients synchronize to
this master server through IPSec.
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(For now, only LMTP and IMAP processes, without replication.)
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And use main.cf's 'master_service_disable' setting to deactivate each
service that's useless for a given instance. (Hence solve conflict when
trying to listen twice on the same port, for instance.)
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It's unfortunate that samhain cannot use the sendmail binary, and wants
to use a inet socket instead. We use a custom port to avoid
conflicts with the usual SMTP port the MX:es need to listen on.
See also: /usr/share/doc/samhain/TODO.Debian
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To be clearer, and to follow the recommendation of the FSF, we include
a full header rather than a single sentence.
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We use a dedicated instance for each role: MDA, MTA out, MX, etc.
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Also, use ESP tunnel mode instead of transport mode.
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So it doesn't mess with the high-priority rules regarding IPSec.
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