IMAP: Adjust dovecot configuration to bullseye.

Provisioning /etc/dovecot/conf.d/*.conf is a pain on upgrade so we
consolidate that by reverting these files to the distro-provided ones
and shipping a single /etc/dovecot/conf.d/99-local.conf override
instead.

1 files changed, 204 insertions, 0 deletions

diff --git a/roles/IMAP/templates/etc/dovecot/conf.d/99-local.conf.j2 b/roles/IMAP/templates/etc/dovecot/conf.d/99-local.conf.j2
new file mode 100644
index 0000000..3560193
--- /dev/null
+++ b/roles/IMAP/templates/etc/dovecot/conf.d/99-local.conf.j2
@@ -0,0 +1,204 @@
+auth_default_realm = fripost.org
+auth_username_format = %Lu
+auth_mechanisms = plain login
+
+mail_uid = vmail
+mail_gid = vmail
+mail_privileged_group =
+
+first_valid_uid = 1
+last_valid_uid = 0
+
+default_vsz_limit = 1024M
+
+service imap-login {
+  inet_listener imap {
+{% if groups.all | length > 1 %}
+    address = {{ ipsec[inventory_hostname_short] }}
+    port = 143
+{% else %}
+    port = 0
+{% endif %}
+  }
+  process_limit = 256
+  process_min_avail = 4
+}
+
+service stats {
+  unix_listener stats-writer {
+    user = vmail
+    mode = 0600
+  }
+}
+
+service submission-login {
+  inet_listener submission {
+    port = 0
+  }
+}
+
+service lmtp {
+  user = vmail
+  unix_listener lmtp {
+    mode = 0
+  }
+  unix_listener /var/spool/postfix-mda/private/dovecot-lmtpd {
+    user = postfix
+    mode = 0600
+  }
+  process_min_avail = 4
+}
+
+service imap {
+  unix_listener imap-master {
+    user = $default_internal_user
+    mode = 0600
+  }
+}
+service imap-hibernate {
+  unix_listener imap-hibernate {
+    # Match user running imap processes, cf.
+    # https://dovecot.org/pipermail/dovecot/2015-August/101783.html
+    user = vmail
+    mode = 0600
+  }
+}
+
+service auth {
+  unix_listener auth-userdb {
+    user = vmail
+    mode = 0600
+  }
+
+  # Postfix smtp-auth
+  unix_listener /var/spool/postfix-msa/private/dovecot-auth {
+    user = postfix
+    group = postfix
+    mode = 0600
+  }
+}
+
+service auth-worker {
+  user = $default_internal_user
+}
+
+
+mail_server_comment = "fripost - demokratisk e-post"
+mail_server_admin = mailto:postmaster@fripost.org
+
+mail_plugins = quota virtual zlib
+
+mail_location = mdbox:~/mail
+mdbox_preallocate_space = yes
+
+mail_attachment_dir = /home/mail/attachments
+mail_attachment_fs = sis-queue /home/mail/attachments/queue:posix
+mail_attachment_hash = %{sha256}
+
+sendmail_path = /usr/sbin/postmulti -i msa -x /usr/sbin/sendmail
+
+ssl = required
+# XXX `doveadm exec imap` fails with "ssl_key: Can't open file
+# /etc/dovecot/ssl/imap.fripost.org.key"
+# https://dovecot.org/pipermail/dovecot/2020-August/119642.html
+# TODO bookworm inline the include_try
+!include_try ../ssl/config
+ssl_dh = </etc/ssl/dhparams.pem
+ssl_min_protocol = TLSv1.2
+ssl_cipher_list = ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
+
+namespace inbox {
+  inbox = yes
+  separator = /
+
+  mailbox Drafts {
+    auto = create
+    special_use = \Drafts
+  }
+  mailbox Junk {
+    auto = create
+    special_use = \Junk
+  }
+  mailbox "Sent Messages" {
+    auto = no
+    special_use = \Sent
+  }
+  mailbox Sent {
+    auto = subscribe
+    special_use = \Sent
+  }
+  mailbox Trash {
+    auto = create
+    special_use = \Trash
+  }
+  mailbox virtual/All {
+    comment = All messages
+    special_use = \All
+  }
+  mailbox virtual/Flagged {
+    comment = All flagged messages
+    special_use = \Flagged
+  }
+}
+
+namespace virtual {
+  prefix = virtual/
+  separator = /
+  location = virtual:/etc/dovecot/virtual:INDEX=MEMORY
+  list = no
+  hidden = no
+  subscriptions = no
+}
+
+imap_hibernate_timeout = 15s
+protocol imap {
+  mail_plugins = $mail_plugins imap_zlib
+  mail_max_userip_connections = 16
+
+  ## TODO Load the 'antispam' plugin for people using the content filter.
+  ## (Otherwise fallback to the static userdb.)
+  #userdb {
+  #  driver = ldap
+  #  args = /etc/dovecot/dovecot-ldap-userdb.conf.ext
+  #
+  #  # Default fields can be used to specify defaults that LDAP may override
+  #  default_fields = home=/home/mail/virtual/%d/%n
+  #}
+}
+
+protocol lmtp {
+  postmaster_address = postmaster@fripost.org
+  # Space separated list of plugins to load (default is global mail_plugins).
+  mail_plugins = $mail_plugins sieve
+}
+
+plugin {
+  antispam_backend = spool2dir
+
+  antispam_trash = Trash
+  antispam_unsure_pattern_ignorecase = MailTrain;MailTrain/*
+  antispam_spam = Junk
+
+  # The first %%lu is replaced by the current time.
+  # The second %%lu is replaced by a counter to generate unique names.
+  # These two tokens MUST be present in the template!
+  antispam_spool2dir_spam    = /home/mail/spamspool/%u-%%10lu-%%06lu.spam
+  antispam_spool2dir_notspam = /home/mail/spamspool/%u-%%10lu-%%06lu.ham
+}
+
+plugin {
+  quota_rule = *:storage=0
+  quota = count:User quota
+  quota_vsizes = yes
+}
+
+plugin {
+  sieve = file:~/sieve;active=~/dovecot.sieve
+  sieve_extensions = +editheader
+  recipient_delimiter = +
+}
+
+plugin {
+  zlib_save = gz
+  zlib_save_level = 6
+}