Commit 6857d1f6 authored by Lars Beckers's avatar Lars Beckers

dovecot: preset-based tls config, new presets, buster compat

parent 9cf6caa4
......@@ -14,9 +14,10 @@ dovecot_max_uid: 0
dovecot_tls_cert: /etc/ssl/private/fullchain.pem
dovecot_tls_key: /etc/ssl/private/privkey.pem
dovecot_tls_ca_dir: /etc/ssl/certs
dovecot_tls_ciphers: "{{ tls_ciphers }}"
dovecot_tls_dh_length: 4096
dovecot_tls_protocols: 'TLSv1.1 TLSv1.2 !SSLv3'
# possible values: modern, intermediate, old, previous
# see also: https://ssl-config.mozilla.org/
dovecot_tls_configuration: 'previous'
dovecot_dsync: false
dovecot_dsync_tls: false
......
---
- name: "include tls config vars (preset: {{ dovecot_tls_configuration }})"
include_vars:
file: "tls-{{ dovecot_tls_configuration }}.yml"
tags:
- dovecot
- mail
- name: ensure all required dovecot packages are installed
apt:
name:
......@@ -36,6 +43,20 @@
- dovecot
- mail
- name: ensure dh params are available
copy:
src: "{{ dovecot_tls_dh_file }}"
dest: /etc/dovecot/dh.pem
owner: root
group: root
mode: '0644'
when: dovecot_tls_dh_file is string
notify:
- restart dovecot
tags:
- dovecot
- mail
- name: ensure there is a folder for global sieve scripts
file:
dest: /var/lib/dovecot/sieve.d
......
......@@ -42,18 +42,39 @@ ssl_client_ca_dir = {{ dovecot_tls_ca_dir }}
# auth_ssl_username_from_cert=yes.
#ssl_cert_username_field = commonName
{% if ansible_distribution_major_version|int < 10 %}
# DH parameters length to use.
{% if dovecot_tls_dh_length %}
ssl_dh_parameters_length = {{ dovecot_tls_dh_length }}
{% else %}
#ssl_dh_parameters_length =
{% endif %}
{% else %}
# DH parameters to use.
{% if dovecot_tls_dh_file %}
ssl_dh = </etc/dovecot/dh.pem
{% else %}
#ssl_dh =
{% endif %}
{% endif %}
{% if ansible_distribution_major_version|int < 10 %}
# SSL protocols to use
ssl_protocols = {{ dovecot_tls_protocols }}
{% else %}
# Minimum TLS version to use
ssl_min_protocol = {{ dovecot_tls_min_protocol }}
{% endif %}
# SSL ciphers to use
#ssl_cipher_list = HIGH:!LOW:!SSLv2:!EXP:!aNULL:!MD5:!RC4:!SHA1
{% if dovecot_tls_ciphers %}
ssl_cipher_list = {{ dovecot_tls_ciphers }}
{% else %}
#ssl_cipher_list =
{% endif %}
# Prefer the server's order of ciphers over client's.
ssl_prefer_server_ciphers = yes
ssl_prefer_server_ciphers = {{ 'yes' if dovecot_tls_prefer_server_ciphers else 'no' }}
# SSL crypto device to use, for valid values run "openssl engine"
#ssl_crypto_device =
......
---
dovecot_tls_protocols: 'TLSv1.2 TLSv1.3'
dovecot_tls_min_protocol: 'TLSv1.2'
dovecot_tls_ciphers: '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'
dovecot_tls_dh_length: 4096 # 2048
dovecot_tls_dh_file: ffdhe4096.txt # ffdhe2048.txt
dovecot_tls_prefer_server_ciphers: false
---
dovecot_tls_protocols: 'TLSv1.3'
dovecot_tls_min_protocol: 'TLSv1.3'
dovecot_tls_ciphers: null
dovecot_tls_dh_length: null
dovecot_tls_dh_file: null
dovecot_tls_prefer_server_ciphers: false
---
dovecot_tls_protocols: 'TLSv1 TLSv1.1 TLSv1.2 !SSLv3'
dovecot_tls_min_protocol: 'TLSv1'
dovecot_tls_ciphers: '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:DHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA'
dovecot_tls_dh_length: 2048 # 1024
dovecot_tls_dh_file: ffdhe2048.txt # openssl dhparam 1024 > ffdhe1024.txt
dovecot_tls_prefer_server_ciphers: true
---
dovecot_tls_protocols: 'TLSv1.1 TLSv1.2 !SSLv3'
dovecot_tls_min_protocol: 'TLSv1.1'
dovecot_tls_ciphers: "{{ tls_ciphers }}"
dovecot_tls_dh_length: 4096
dovecot_tls_dh_file: ffdhe4096.txt # ffdhe2048.txt
dovecot_tls_prefer_server_ciphers: true
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