| Commit message (Collapse) | Author | Age | Files |
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We use the version from buster-backports (currently 1.4.4+dfsg.1-1~bpo10+1)
for the elastic theme.
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lacme now ships that file as /etc/lacme/nginx.conf.
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For postfix, don't defer if "abused legit". (I.e., DBL return code in
the 127.0.1.100+ range.) This used to work for Postfix 3.1.14 (Stretch)
but for 3.4.8 (Buster) the 'defer_if_reject' also applies to
$smtpd_relay_restrictions, to reject_unauth_destination &
reject_unlisted_recipient in particular.
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On the infrastructure boundary. We don't reject/quarantine as it would
affect members who forward their mail sent to <user@example.com> to
<user@fripost.org>. Members can install Sieve rules to send any
messages with failed Authentication-Results headers directly in their
spambox.
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We shouldn't use RuntimeDirectory to create it anew because is belongs
to the Sympa daemon and WWSympa looks up for PID files in there.
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There is a real security gain in not using the 'www-data' user: nginx
workers can't read Nextcloud config files and data directory, so should
our nginx configuration be insecure a leak is much less likely.
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This was forgotten in 0bfbe0e49f7fc77abfe7bb5d92c72dbdf6742204.
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Also, update baseline to Debian 10 (codename Buster) and deploy a local
Redis instance for Transactional File Locking
https://docs.nextcloud.com/server/18/admin_manual/configuration_server/caching_configuration.html#id2
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Instead of using the fallback key. That way messages from our lists
have proper DMARC alignment (at least when envelope sender and From
header are under domain lists.fripost.org).
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Cf. https://lists.debian.org/debian-devel-announce/2020/04/msg00004.html . \o/
It's also fairly easy to deploy onto the Debian infrastucture:
$ USERNAME="guilhem"
$ SELECTOR="5d30c523ff3622ed454230a16a11ddf6.$USERNAME.user"
$ printf "dkimPubKey: %s %s\n" "$SELECTOR" \
"$(openssl pkey -pubin -in "./certs/dkim/$SELECTOR:debian.org.pub" -outform DER | base64 -w0)" \
| gpg --clearsign | s-nail -r "USERNAME@debian.org" -s dkimPubKey changes@db.debian.org
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Since 1.5 (Buster) APT supports https:// natively. There is no need to
install ‘apt-transport-https’ (now a dummy transitional package)
anymore. Plain-text connection don't undermine security as APT checks
package OpenPGP signatures locally, but there is no reason not to use
TLS here.
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* Use nftables sets with a timeout
* Start daemon with a hardened unit file and restricted Capability
Bounding Set. (This requires to change the log path to
/var/log/fail2ban/*.)
* Skip database as we don't care about persistence.
* Refactor jail.local
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Debian Buster uses the nftables framework by default.
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Our internal IPs don't have a reverse PTR record, and skipping the
resolution speeds up mail delivery.
http://www.postfix.org/postconf.5.html#smtpd_peername_lookup
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This avoids
[DEPRECATION WARNING]: The TRANSFORM_INVALID_GROUP_CHARS settings is set
to allow bad characters in group names by default, this will change, but
still be user configurable on deprecation. This feature will be removed
in version 2.10. Deprecation warnings can be disabled by setting
deprecation_warnings=False in ansible.cfg.
[WARNING]: Invalid characters were found in group names but not
replaced, use -vvvv to see details
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This avoids the
[WARNING]: The value False (type bool) in a string field was converted
to u'False' (type string). If this does not look like what you expect,
quote the entire value to ensure it does not change.
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This avoids lmtp errors like
Error: mmap(size=0) failed with file […] dbox-Mails/dovecot.index.cache: Cannot allocate memory
See https://www.dovecot.org/list/dovecot/2012-August/137569.html and
https://www.dovecot.org/list/dovecot/2011-December/132455.html .
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See RFC 8314 sec. 3.3 "Cleartext Considered Obsolete".
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This is useful when an ESTABLISHED connection is seen as NEW because the
client was offline for some time. For instance, clients now gracefully
close existing SSH connections immediately after resuming from a suspend
state, rather that waiting for the TCP timeout.
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It doesn't hurt to install them on all machines, but we're overriding
the provided /etc/fail2ban/filter.d/dovecot.conf and would rather keep
our delta minimal.
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Cf. http://www.openspf.org/Best_Practices/Outbound .
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Use admin@fripost.org instead. We were sending out (to the admin team)
system messages with non-existing or invalid envelope sender addresses,
such as <logcheck@antilop.fripost.org> or <root@mistral.fripost.org>.
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(That is, remove algorithms from Suite-B-GCM-128.)
Cf. https://wiki.strongswan.org/projects/strongswan/wiki/IKEv2CipherSuites
and https://wiki.strongswan.org/projects/strongswan/wiki/SecurityRecommendations .
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And use ‘noreply.fripost.org’ as HELO name rather than $myhostname
(i.e., ‘smtp.fripost.org’), so the same SPF policy can be used for ehlo
and envelope sender identities.
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Since d8d07afe49e69114f8deb807031bec71a327d3ae our MySQL flavor is
MariaDB.
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We don't need suspend-on-disk (hibernation).
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Inspired from /lib/systemd/system/bacula-fd.service.
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We don't need it anymore as we use https:// these days.
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And remove ‘ReadOnlyDirectories=/’ as it's implied by ‘ProtectSystem=strict’.
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