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* 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 .
* s/LDAP-provider/LDAP_provider/Guilhem Moulin2020-05-191
| | | | This was forgotten after a092bfd947773281a23419ee0ab62358371b7166.
* stunnel4: Harden and socket-activate.Guilhem Moulin2020-05-181
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* Remove 'meta: flush_handlers' directives under conditionals.Guilhem Moulin2020-05-171
| | | | They don't appear to be supported anymore.
* Upgrade baseline to Debian 10.Guilhem Moulin2020-05-165
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* Improve/harden fail2ban configuration.Guilhem Moulin2020-01-251
| | | | | | | | | * 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 Moulin2020-01-233
| | | | Debian Buster uses the nftables framework by default.
* 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.
* Update 'IMAP', 'MSA' and 'LDAP-provider' roles to Debian Stretch.Guilhem Moulin2018-12-091
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* Disable resume device.Guilhem Moulin2018-12-091
| | | | We don't need suspend-on-disk (hibernation).
* 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.
* Install unbound on metal hosts.Guilhem Moulin2018-12-032
| | | | (A validating, recursive, caching DNS resolver.)
* 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 Moulin2018-12-032
| | | | Cf. lmdb_table(5).
* Upgrade baseline to Debian Stretch.Guilhem Moulin2018-12-031
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* Skip samhain installation.Guilhem Moulin2018-12-032
| | | | It's become too verbose (too many false-positive)…
* Upgrade syntax to Ansible 2.5.Guilhem Moulin2018-04-041
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* Upgrade syntax to Ansible 2.4.Guilhem Moulin2017-11-231
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* Fix detection of KVM guests.Guilhem Moulin2017-07-291
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* Don't install debsecan anymore by default.Guilhem Moulin2017-06-261
| | | | https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=789196
* /lib/systemd/system → /etc/systemd/systemGuilhem Moulin2017-05-312
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* Change group of executables in /usr/local/{bin,sbin} from root to staff.Guilhem Moulin2017-05-142
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* Postfix: ensure common aliases are present.Guilhem Moulin2016-09-182
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* FreshClam: change ownership of /etc/clamav/freshclam.conf.Guilhem Moulin2016-09-181
| | | | | | | | To match the stock version shipped by clamav-freshclam 0.99.2+dfsg-0+deb8u2 ~$ stat -c '%U:%G %a' /etc/clamav/freshclam.conf clamav:adm 444
* Route all internal SMTP traffic through IPsec.Guilhem Moulin2016-07-101
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* Postfix: don't share the master.cf between the instances.Guilhem Moulin2016-07-101
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* Route SMTP traffic from the webmail through IPsec.Guilhem Moulin2016-07-101
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* ClamAV (FreshClam): use a localized Database Mirror.Guilhem Moulin2016-07-091
| | | | | | As db.local.clamav.net is not always properly localized. Furthermore, our previous Ansiblee script did not ensure ordering of the DatabaseMirror lines.
* IPSec → IPsecGuilhem Moulin2016-06-291
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* Use stunnel to secure the connection from the webmail to ldap.fripost.org.Guilhem Moulin2016-06-051
| | | | | We should use IPSec instead, but doing so would force us to weaken slapd.conf's ‘security’ setting.
* IPSec: replace (self-signed) X.509 certs by their raw pubkey for authentication.Guilhem Moulin2016-05-241
| | | | There is no need to bother with X.509 cruft here.
* Tunnel bacula (dir → {fd,sd} and fd → sd) traffic through IPSec.Guilhem Moulin2016-05-221
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* Tunnel munin-update traffic through IPSec.Guilhem Moulin2016-05-223
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* Set up IPSec tunnels between each pair of hosts.Guilhem Moulin2016-05-223
| | | | | | | | | | | | | | | We use a dedicated, non-routable, IPv4 subnet for IPSec. Furthermore the subnet is nullrouted in the absence of xfrm lookup (i.e., when there is no matching IPSec Security Association) to avoid data leaks. Each host is associated with an IP in that subnet (thus only reachble within that subnet, either by the host itself or by its IPSec peers). The peers authenticate each other using RSA public key authentication. Kernel traps are used to ensure that connections are only established when traffic is detected between the peers; after 30m of inactivity (this value needs to be less than the rekeying period) the connection is brought down and a kernel trap is installed.
* Move /etc/ssl/private/dhparams.pem to /etc/ssl/dhparams.pem and make it public.Guilhem Moulin2016-05-181
| | | | | | | | | | Ideally we we should also increase the Diffie-Hellman group size from 2048-bit to 3072-bit, as per ENISA 2014 report. https://www.enisa.europa.eu/publications/algorithms-key-size-and-parameters-report-2014 But we postpone that for now until we are reasonably certain that older client won't be left out.
* Add an ansible module 'fetch_cmd' to fetch the output of a remote command ↵Guilhem Moulin2016-05-183
| | | | | | locally. And use this to fetch all X.509 leaf certificates.
* Use systemd unit files for stunnel4.Guilhem Moulin2016-05-125
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* sysctl: don't set IPv6 privacy extensions globaly.Guilhem Moulin2016-04-011
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* sysctl: set net.ipv6.conf.all.accept_ra = 0.Guilhem Moulin2016-03-301
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* Ansible: Using bare variables is deprecated, and will be removed in a future ↵Guilhem Moulin2016-03-022
| | | | release.
* Upgrade playbooks to Ansible 2.0.Guilhem Moulin2016-02-125
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* Only install letsencrypt-tiny to the relevant hosts.Guilhem Moulin2015-12-281
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* Use the Let's Encrypt CA for our public certs.Guilhem Moulin2015-12-201
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* Internal Postfix config: Generate RSA 4096 keys by default.Guilhem Moulin2015-10-281
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* Configure FreshClam.Guilhem Moulin2015-09-151
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* Change match to "^(Genuine)?Intel.*" for Intel processors.Guilhem Moulin2015-07-121
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* Configure munin nodes & master.Guilhem Moulin2015-06-102
| | | | | Interhost communications are protected by stunnel4. The graphs are only visible on the master itself, and content is generated by Fast CGI.
* Configure Bacula File Daemon / Storage Daemon / Director.Guilhem Moulin2015-06-072
| | | | | Using client-side data signing/encryption and wrapping inter-host communication into stunnel.
* Install CAcert.org root certificates.Guilhem Moulin2015-06-071
| | | | | XXX: this is a workaround the CAcert root CAs not being present in Jessie. In stretch, we would merely install the 'ca-cacert' package.
* logjam mitigation.Guilhem Moulin2015-06-071
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