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* Firewall: Move martian and bogus TCP filters early in the packet flow.Guilhem Moulin2020-11-021
| | | | | This is more efficient: the earlier we filter the crap out the less resources they consume.
* kernel parameters: Disable SYN cookies and improve SYN backlog handling.Guilhem Moulin2020-11-021
| | | | See tcp(7) and https://levelup.gitconnected.com/linux-kernel-tuning-for-high-performance-networking-high-volume-incoming-connections-196e863d458a .
* typofixGuilhem Moulin2020-11-021
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* IMAP: Update role to Debian Buster.Guilhem Moulin2020-05-191
| | | | | | | | For `ssl_cipher_list` we pick the suggested value from https://ssl-config.mozilla.org/#server=dovecot&version=2.3.9&config=intermediate&openssl=1.1.1d At the moment it's equivalent (modulo order) to adding ‘EDH+AESGCM+aRSA’ to ‘EECDH+AESGCM:EECDH+CHACHA20!MEDIUM!LOW!EXP!aNULL!eNULL’.
* MSA: Update role to Debian Buster.Guilhem Moulin2020-05-191
| | | | | | | | For `ssl_cipher_list` we pick the suggested value from https://ssl-config.mozilla.org/#server=postfix&version=3.4.10&config=intermediate&openssl=1.1.1d At the moment it's equivalent (modulo order) to adding ‘EDH+AESGCM+aRSA’ to ‘EECDH+AESGCM:EECDH+CHACHA20!MEDIUM!LOW!EXP!aNULL!eNULL’.
* s/LDAP-provider/LDAP_provider/Guilhem Moulin2020-05-192
| | | | This was forgotten after a092bfd947773281a23419ee0ab62358371b7166.
* stunnel4: Harden and socket-activate.Guilhem Moulin2020-05-182
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* Firewall: note on reqid matching.Guilhem Moulin2020-05-181
| | | | To be done when we upgrade to Bullseye for more fine-grained control.
* AEAD ciphers: Add EECDH+CHACHA20 macro.Guilhem Moulin2020-05-181
| | | | | | | This adds the following two ciphers: ECDHE-ECDSA-CHACHA20-POLY1305 TLSv1.2 Kx=ECDH Au=ECDSA Enc=CHACHA20/POLY1305(256) Mac=AEAD ECDHE-RSA-CHACHA20-POLY1305 TLSv1.2 Kx=ECDH Au=RSA Enc=CHACHA20/POLY1305(256) Mac=AEAD
* Firewall: Use `meta secpath exists` to match xfrm associations.Guilhem Moulin2020-05-181
| | | | | Marking incoming ESP packets and matching decapsulated packets doesn't work with NAT traverslate (UDP encapsulation aka MOBIKE).
* Remove 'meta: flush_handlers' directives under conditionals.Guilhem Moulin2020-05-171
| | | | They don't appear to be supported anymore.
* Roundcube: Port to Debian 10.Guilhem Moulin2020-05-171
| | | | | We use the version from buster-backports (currently 1.4.4+dfsg.1-1~bpo10+1) for the elastic theme.
* typofixGuilhem Moulin2020-05-161
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* Upgrade baseline to Debian 10.Guilhem Moulin2020-05-1623
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* /etc/apt/sources.list: Use https:// URIs.Guilhem Moulin2020-01-251
| | | | | | | | 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.
* Improve/harden fail2ban configuration.Guilhem Moulin2020-01-257
| | | | | | | | | * 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
* Convert firewall to nftables.Guilhem Moulin2020-01-2311
| | | | Debian Buster uses the nftables framework by default.
* Postfix: disable DNS lookups on the internal SMTPds.Guilhem Moulin2020-01-231
| | | | | | 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
* tr/-/_/ in group names.Guilhem Moulin2020-01-223
| | | | | | | | | | | | 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
* MSA: Open 465/TCP for Email Submission over TLS.Guilhem Moulin2019-03-194
| | | | See RFC 8314 sec. 3.3 "Cleartext Considered Obsolete".
* firewall: gracefully close invalid connections.Guilhem Moulin2018-12-221
| | | | | | | 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.
* fail2ban: Only install the roundcube/dovecot filters if needed.Guilhem Moulin2018-12-151
| | | | | | 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.
* submission: Prospective SPF checking.Guilhem Moulin2018-12-122
| | | | Cf. http://www.openspf.org/Best_Practices/Outbound .
* IPsec: use Suite-B-GCM-256 algorithms for IKEv2 & ESP.Guilhem Moulin2018-12-091
| | | | | | | (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 .
* MSA verification probes: enable opportunistic encryption.Guilhem Moulin2018-12-091
| | | | | | 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.
* Update 'IMAP', 'MSA' and 'LDAP-provider' roles to Debian Stretch.Guilhem Moulin2018-12-096
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* Disable resume device.Guilhem Moulin2018-12-093
| | | | We don't need suspend-on-disk (hibernation).
* systemd.service: Tighten hardening options.Guilhem Moulin2018-12-092
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* bacula-*.service: Don't fork in the background.Guilhem Moulin2018-12-091
| | | | Inspired from /lib/systemd/system/bacula-fd.service.
* Upgrade 'lists' role to Debian Stretch.Guilhem Moulin2018-12-091
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* Firewall: disable outgoing access to git:// remote servers.Guilhem Moulin2018-12-091
| | | | We don't need it anymore as we use https:// these days.
* systemd: Replace ‘ProtectSystem=full’ with ‘ProtectSystem=strict’.Guilhem Moulin2018-12-092
| | | | And remove ‘ReadOnlyDirectories=/’ as it's implied by ‘ProtectSystem=strict’.
* Firewall: REJECT outgoing connections instead of DROPing them.Guilhem Moulin2018-12-091
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* Don't install the haveged entropy daemon.Guilhem Moulin2018-12-092
| | | | | It's not really needed on our metal hosts, and our KVM guests use virtio-rng.
* ntp.conf: reduce delta with the packaged version.Guilhem Moulin2018-12-091
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* MX: chroot postscreen(8), smtpd(8) and cleanup(8) daemons.Guilhem Moulin2018-12-091
| | | | | | Unlike what we wrote in 2014 (cf. 4fb4be4d279dd94cab33fc778cfa318b93d6926f) the postscreen(8) server can run chrooted, meaning we can also chroot the smtpd(8), tlsproxy(8), dnsblog(8) and cleanup(8) daemons.
* postfix: remove explicit default 'mail_owner = postfix'.Guilhem Moulin2018-12-061
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* postfix ≥3.0: don't advertise SMTPUTF8 support.Guilhem Moulin2018-12-061
| | | | | | | | | | | | | | | | | We're relaying messages to our LMTP daemons (Dovecot, Amavisd) and some downstream SMTP servers, not all of which are under our control. Forwarding messages with UTF-8 envelope addresses or RFC 5322 headers yields undeliverable messages, and the bounces make us a potential backscatter source. So it's better to disable SMTPUTF8 at this point. Cf. also http://www.postfix.org/SMTPUTF8_README.html and https://unix.stackexchange.com/questions/320091/configure-postfix-and-dovecot-lmtp-to-receive-mail-via-smtputf8 . See also upstream's comment at https://marc.info/?l=postfix-users&m=149183235529042&w=2 : “Perhaps SMTPUTF8 autodetection could be more granular: UTF8 in the envelope is definitely problematic for a receiver that does not support SMTPUTF8, while UTF8 in a message header is less so.”
* DKIM: also include the "d=" tag in key filenames, not only the "s=" tag.Guilhem Moulin2018-12-051
| | | | | While the combination of "s=" tag (selector) & "d=" tag signing domain maps to a unique key, the selector alone doesn't necessarily.
* Install unbound on metal hosts.Guilhem Moulin2018-12-034
| | | | (A validating, recursive, caching DNS resolver.)
* Define new host "calima" serving Nextcloud.Guilhem Moulin2018-12-031
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* Upgrade syntax to Ansible 2.7 (apt module).Guilhem Moulin2018-12-039
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* Postfix: replace cdb & btree tables with lmdb ones.Guilhem Moulin2018-12-034
| | | | Cf. lmdb_table(5).
* IPsec: allow ISAKMP over IPv6.Guilhem Moulin2018-12-032
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* Upgrade baseline to Debian Stretch.Guilhem Moulin2018-12-0315
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* Skip samhain installation.Guilhem Moulin2018-12-034
| | | | It's become too verbose (too many false-positive)…
* Harden anti spam on the MX:es.Guilhem Moulin2018-06-091
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* More logcheck-database tweaks.Guilhem Moulin2018-04-043
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* Postfix: replace 'fifo' types with 'unix', as it's the new default.Guilhem Moulin2018-04-041
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* sympa: wibbleGuilhem Moulin2018-04-041
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