nginx: add common role for nginx

esmil:
- disable access log and log errors to syslog (journal really)
  use journalctl -u nginx to see the errors
- hoist some configuration values into ansible variables
- add tags and use a handler to reload nginx on configuration changes
- make nginx do its DNS queries against our local resolved
  this enables nginx to use DNSSEC and DoT
- don't start nginx before the network is up. if it can't do
  dns lookups ssl_stapling will be ignored

4 files changed, 151 insertions, 0 deletions

diff --git a/roles/nginx/defaults/main.yml b/roles/nginx/defaults/main.yml
new file mode 100644
index 0000000..914dde8
--- /dev/null
+++ b/roles/nginx/defaults/main.yml
@@ -0,0 +1,7 @@
+---
+nginx_worker_connections: 768
+
+nginx_ssl_protocols: 'TLSv1.2 TLSv1.3'
+nginx_ssl_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'
+
+# vim: set ts=2 sw=2 et:
diff --git a/roles/nginx/handlers/main.yml b/roles/nginx/handlers/main.yml
new file mode 100644
index 0000000..f335839
--- /dev/null
+++ b/roles/nginx/handlers/main.yml
@@ -0,0 +1,7 @@
+---
+- name: reload nginx
+  systemd:
+    name: nginx.service
+    state: reloaded
+
+# vim: set ts=2 sw=2 et:
diff --git a/roles/nginx/tasks/main.yml b/roles/nginx/tasks/main.yml
new file mode 100644
index 0000000..f73e5e1
--- /dev/null
+++ b/roles/nginx/tasks/main.yml
@@ -0,0 +1,64 @@
+---
+- name: Configure /etc/nginx/nginx.conf
+  template:
+    dest: '/etc/nginx/nginx.conf'
+    src: nginx.conf.j2
+    owner: root
+    group: root
+    mode: 0644
+  notify:
+  - reload nginx
+  tags:
+  - nginx
+
+- name: Disable default site
+  file:
+    path: '/etc/nginx/sites-enabled/default'
+    state: absent
+  notify:
+  - reload nginx
+  tags:
+  - nginx
+
+- name: Download dhparam
+  get_url:
+    dest: '/etc/nginx/dhparam'
+    url: 'https://ssl-config.mozilla.org/ffdhe2048.txt'
+    owner: root
+    group: root
+    mode: 0440
+  notify:
+  - reload nginx
+  tags:
+  - nginx
+
+- name: Create service drop-in directory
+  file:
+    dest: '/etc/systemd/system/nginx.service.d'
+    state: directory
+    owner: root
+    group: root
+    mode: 0755
+  tags:
+  - nginx
+
+- name: Start nginx after networks are configured
+  copy:
+    dest: '/etc/systemd/system/nginx.service.d/wait-online.conf'
+    src: wait-online.conf
+    owner: root
+    group: root
+    mode: 0644
+  tags:
+  - nginx
+
+- name: Enable nginx service
+  systemd:
+    name: nginx.service
+    enabled: yes
+    masked: no
+    state: started
+  tags:
+  - nginx
+
+# vim: set ts=2 sw=2 et:
diff --git a/roles/nginx/templates/nginx.conf.j2 b/roles/nginx/templates/nginx.conf.j2
new file mode 100644
index 0000000..1188e53
--- /dev/null
+++ b/roles/nginx/templates/nginx.conf.j2
@@ -0,0 +1,73 @@
+user www-data;
+worker_processes auto;
+{% if nginx_worker_rlimit_nofile is defined %}
+worker_rlimit_nofile {{ nginx_worker_rlimit_nofile }};
+{% endif %}
+pid /run/nginx.pid;
+error_log /dev/null debug;
+error_log syslog:server=unix:/dev/log,facility=daemon,tag=nginx notice;
+
+include /etc/nginx/modules-enabled/*.conf;
+
+events {
+	worker_connections {{ nginx_worker_connections }};
+	# multi_accept on;
+}
+
+http {
+	##
+	# Basic Settings
+	##
+
+	sendfile on;
+	tcp_nopush on;
+	types_hash_max_size 2048;
+	# server_tokens off;
+
+	# server_names_hash_bucket_size 64;
+	# server_name_in_redirect off;
+
+	include /etc/nginx/mime.types;
+	default_type application/octet-stream;
+
+	##
+	# Resolver
+	##
+
+	resolver 127.0.0.53 valid=30s; # systemd-resolved listens here
+
+	##
+	# SSL Settings
+	##
+
+	ssl_protocols {{ nginx_ssl_protocols }};
+	ssl_ciphers   {{ nginx_ssl_ciphers }};
+	ssl_prefer_server_ciphers off;
+	ssl_dhparam   /etc/nginx/dhparam;
+
+	##
+	# Logging Settings
+	##
+
+	access_log off;
+
+	##
+	# Gzip Settings
+	##
+
+	gzip on;
+
+	# gzip_vary on;
+	# gzip_proxied any;
+	# gzip_comp_level 6;
+	# gzip_buffers 16 8k;
+	# gzip_http_version 1.1;
+	# gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
+
+	##
+	# Virtual Host Configs
+	##
+
+	include /etc/nginx/conf.d/*.conf;
+	include /etc/nginx/sites-enabled/*;
+}