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roles/nginx: Switch to acme.sh for Let's Encrypt

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The certbot-auto client that I've been using for a long time is now
only supported if you install it using snap. I don't use snap on my
systems so I decided to switch to the acme.sh client, which is imp-
lemented in POSIX shell with no dependencies. One bonus of this is
that I can start using ECC certificates.

This also configures the .well-known directory so we can use webroot
when installing and renewing certificates. I have yet to understand
how the renewal works with regards to webroot, though. I may have to
update the systemd timers to point to /var/lib/letsencrypt/.well-known.
This commit is contained in:
Alan Orth 2021-03-19 23:39:30 +02:00
parent 65fc52c5e5
commit a34cb1e666
Signed by: alanorth
GPG Key ID: 0FB860CC9C45B1B9
7 changed files with 63 additions and 132 deletions
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9
roles/nginx/defaults/main.yml
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@ -25,10 +25,13 @@ nginx_ssl_stapling_resolver: '1.1.1.1 1.0.0.1 [2606:4700:4700::1111] [2606:4700:
use_letsencrypt: True
# Directory root for Let's Encrypt certs
letsencrypt_root: /etc/letsencrypt/live
letsencrypt_root: /etc/ssl
# Location of Let's Encrypt's certbot script
letsencrypt_certbot_dest: /opt/certbot-auto
# Location where to save initial acme.sh script. After installation the script
# will automatically create its home in the /root/.acme.sh directory (including
# a copy of the script itself).
letsencrypt_acme_script: /root/acme.sh
letsencrypt_acme_home: /root/.acme.sh
# stable is 1.18.x
# mainline is 1.19.x

166
roles/nginx/tasks/letsencrypt.yml
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@ -1,135 +1,53 @@
---
# Use acme.sh instead of certbot because they only support installation via
# snap now.
- block:
- name: Remove certbot
apt: name=certbot state=absent
- name: Remove old certbot post and pre hooks for nginx
file: dest={{ item }} state=absent
with_items:
- /etc/letsencrypt/renewal-hooks/pre/stop-nginx.sh
- /etc/letsencrypt/renewal-hooks/post/start-nginx.sh
- name: Download acme.sh
get_url:
url: https://raw.githubusercontent.com/acmesh-official/acme.sh/master/acme.sh
dest: "{{ letsencrypt_acme_script }}"
- name: Prepare Let's Encrypt well-known directory
file:
state: directory
path: /var/lib/letsencrypt/.well-known
owner: root
group: nginx
mode: g+s
- name: Copy systemd service to renew Let's Encrypt certs
template: src=renew-letsencrypt.service.j2 dest=/etc/systemd/system/renew-letsencrypt.service mode=0644 owner=root group=root
template:
src: renew-letsencrypt.service.j2
dest: /etc/systemd/system/renew-letsencrypt.service
mode: 0644
owner: root
group: root
- name: Copy systemd timer to renew Let's Encrypt certs
copy: src=renew-letsencrypt.timer dest=/etc/systemd/system/renew-letsencrypt.timer mode=0644 owner=root group=root
copy:
src: renew-letsencrypt.timer
dest: /etc/systemd/system/renew-letsencrypt.timer
mode: 0644
owner: root
group: root
# always issues daemon-reload just in case the server/timer changed
# always issues daemon-reload just in case the service/timer changed
- name: Start and enable systemd timer to renew Let's Encrypt certs
systemd: name=renew-letsencrypt.timer state=started enabled=yes daemon_reload=yes
- name: Download certbot
get_url: dest={{ letsencrypt_certbot_dest }} url=https://dl.eff.org/certbot-auto mode=700
# Dependencies certbot checks for on its first run. I set them in a fact so that
# I can pass the list directly to the apt module to install in one transaction.
- name: Set certbot dependencies (Debian 10)
when: ansible_distribution == 'Debian' and ansible_distribution_major_version is version('10', '==')
set_fact:
certbot_dependencies:
- augeas-lenses
- binutils
- binutils-common
- binutils-x86-64-linux-gnu
- cpp
- cpp-8
- gcc
- gcc-8
- libasan5
- libatomic1
- libaugeas0
- libbinutils
- libc-dev-bin
- libc6-dev
- libcc1-0
- libexpat1-dev
- libffi-dev
- libgcc-8-dev
- libgomp1
- libisl19
- libitm1
- liblsan0
- libmpc3
- libmpfr6
- libmpx2
- libpython-dev
- libpython2-dev
- libpython2.7
- libpython2.7-dev
- libquadmath0
- libssl-dev
- libtsan0
- libubsan1
- linux-libc-dev
- python-dev
- python-pip-whl
- python-pkg-resources
- python-virtualenv
- python2-dev
- python2.7-dev
- python3-distutils
- python3-lib2to3
- python3-virtualenv
- virtualenv
# Dependencies certbot checks for on its first run. I set them in a fact so that
# I can pass the list directly to the apt module to install in one transaction.
- name: Set certbot dependencies (Ubuntu 18.04)
when: ansible_distribution == 'Ubuntu' and ansible_distribution_version is version('18.04', '==')
set_fact:
certbot_dependencies:
- augeas-lenses
- binutils
- binutils-common
- binutils-x86-64-linux-gnu
- cpp
- cpp-7
- gcc
- gcc-7
- gcc-7-base
- libasan4
- libatomic1
- libaugeas0
- libbinutils
- libc-dev-bin
- libc6-dev
- libcc1-0
- libcilkrts5
- libexpat1-dev
- libffi-dev
- libgcc-7-dev
- libgomp1
- libisl19
- libitm1
- liblsan0
- libmpc3
- libmpx2
- libpython-dev
- libpython2.7
- libpython2.7-dev
- libquadmath0
- libssl-dev
- libtsan0
- libubsan0
- linux-libc-dev
- python-dev
- python-pip-whl
- python-pkg-resources
- python-virtualenv
- python2.7-dev
- python3-virtualenv
- virtualenv
- name: Install certbot dependencies
apt: name={{ certbot_dependencies }} state=present update_cache=yes
when: ansible_distribution != 'Ubuntu' and ansible_distribution_major_version is version('20.04', '!=')
tags: letsencrypt
# On Ubuntu 20.04 it is no longer recommended/supported to use the standalone
# certbot-auto so I guess we need to use the one from the repositories.
- block:
- name: Install certbot (Ubuntu 20.04)
apt: name=certbot state=present update_cache=yes
- name: Copy certbot post and pre hooks for nginx
copy: src={{ item.src }} dest={{ item.dest }} owner=root group=root mode=0755
with_items:
- { src: 'stop-nginx.sh', dest: '/etc/letsencrypt/renewal-hooks/pre/stop-nginx.sh' }
- { src: 'start-nginx.sh', dest: '/etc/letsencrypt/renewal-hooks/post/start-nginx.sh' }
systemd:
name: renew-letsencrypt.timer
state: started
enabled: yes
daemon_reload: yes
when: ansible_distribution == 'Ubuntu' and ansible_distribution_version is version('20.04', '==')
tags: letsencrypt

2
roles/nginx/tasks/main.yml
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@ -71,7 +71,7 @@
- name: Configure Let's Encrypt
include_tasks: letsencrypt.yml
when: use_letsencrypt is defined and use_letsencrypt
#when: use_letsencrypt is defined and use_letsencrypt
tags: letsencrypt
# vim: set ts=2 sw=2:

4
roles/nginx/templates/https.j2
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@ -16,8 +16,8 @@
# concatenated key + cert
# See: http://nginx.org/en/docs/http/configuring_https_servers.html
ssl_certificate {{ letsencrypt_root }}/{{ domain_name }}/fullchain.pem;
ssl_certificate_key {{ letsencrypt_root }}/{{ domain_name }}/privkey.pem;
ssl_certificate {{ letsencrypt_root }}/certs/{{ domain_name }}.fullchain.pem;
ssl_certificate_key {{ letsencrypt_root }}/private/{{ domain_name }}.key.pem;
{% endif %}

6
roles/nginx/templates/renew-letsencrypt.service.j2
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@ -1,7 +1,9 @@
[Unit]
Description=Renew Let's Encrypt certificates
ConditionFileIsExecutable={{ letsencrypt_certbot_dest }}
ConditionFileIsExecutable={{ letsencrypt_acme_home }}/acme.sh
[Service]
Type=oneshot
ExecStart={{ letsencrypt_certbot_dest }} renew --standalone --pre-hook "/bin/systemctl stop nginx" --post-hook "/bin/systemctl start nginx"
ExecStart={{ letsencrypt_acme_home }}/acme.sh --cron --home {{ letsencrypt_acme_home }} --reloadcmd "/bin/systemctl reload nginx"
SuccessExitStatus=0 2

2
roles/nginx/templates/vhost.conf.j2
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@ -14,6 +14,8 @@ server {
listen [::]:80;
server_name {{ domain_name }} {{ domain_aliases }};
{% include 'well-known.j2' %}
# redirect http -> https
location / {
# ? in rewrite makes sure nginx doesn't append query string again

6
roles/nginx/templates/well-known.j2 Normal file
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@ -0,0 +1,6 @@
location ^~ /.well-known/acme-challenge/ {
allow all;
root /var/lib/letsencrypt/;
default_type "text/plain";
try_files $uri =404;
}