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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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Most notably pipelining=True and sysctl_set=yes.
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To avoid low-entropy conditions, see
http://www.issihosts.com/haveged/
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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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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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For non-indexed attributes, do not ask the LDAP server to modify values
in the symmetric difference of A (the entry found in the directory) and
B (the target). That is, we replace A by B only when they are disjoint;
otherwise we remove values in A-B and add those in B-A.
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Since indices are specified in the database LDIF.
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We use a dedicated instance for each role: MDA, MTA out, MX, etc.
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We use ESP only, so other protocols shouldn't be ACCEPTed.
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This is pointless since the service will be restarted anyway.
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In particular, run 'apt-get update' right after configured APT, and
restart daemon right after configured them.
The advantage being that if ansible crashes in some "task", the earlier
would already be restarted if neeeded. (This may not happen in the next
run since the configuration should already be up to date.)
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Packets originating from our (non-routable) $ipsec are marked; there is
no xfrm lookup (i.e., no matching IPSec association), the packet will
retain its mark and be null routed later on, thanks to
ip rule add fwmark "$secmark" table 666 priority 666
ip route add blackhole default table 666
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At the each IPSec end-point the traffic is DNAT'ed to / MASQUERADE'd
from our dedicated IP after ESP decapsulation. Also, some IP tables
ensure that alien (not coming from / going to the tunnel end-point) is
dropped.
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These rules are automatically included by third-party servers such as
strongSwan or fail2ban.
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update-firewall.sh -c does not update the firewall, but returns a
non-zero value iff. running it without the switch would modify it.
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