Nextcloud: use dedicated user and PHP FPM pool.

There is a real security gain in not using the 'www-data' user: nginx
workers can't read Nextcloud config files and data directory, so should
our nginx configuration be insecure a leak is much less likely.

4 files changed, 52 insertions, 18 deletions

diff --git a/roles/nextcloud/files/etc/cron.d/nextcloud b/roles/nextcloud/files/etc/cron.d/nextcloud
index 681cd43..3c4aac0 100644
--- a/roles/nextcloud/files/etc/cron.d/nextcloud
+++ b/roles/nextcloud/files/etc/cron.d/nextcloud
@@ -1,2 +1,2 @@
 MAILTO=root
-*/5 * * * * www-data php -f /usr/local/share/nextcloud/cron.php
+*/5 * * * * _nextcloud php -f /usr/local/share/nextcloud/cron.php
diff --git a/roles/nextcloud/files/etc/nginx/sites-available/nextcloud b/roles/nextcloud/files/etc/nginx/sites-available/nextcloud
index d748dc9..f1f4b66 100644
--- a/roles/nextcloud/files/etc/nginx/sites-available/nextcloud
+++ b/roles/nextcloud/files/etc/nginx/sites-available/nextcloud
@@ -76,6 +76,7 @@ server {
                                  post_max_size=512M
                                  memory_limit=512M";
         fastcgi_param PHP_ADMIN_VALUE "open_basedir=$document_root:/var/www/nextcloud:/mnt/nextcloud-data:/etc/nextcloud:/var/cache/nextcloud:/var/log/nextcloud:/usr/share/php:/tmp:/dev";
+        fastcgi_pass  unix:/run/php/php7.3-fpm@nextcloud.sock;
     }
 
     location ~ ^/(?:updater|ocs-provider)(?:$|/) {
diff --git a/roles/nextcloud/files/etc/php/fpm/pool.d/nextcloud.conf b/roles/nextcloud/files/etc/php/fpm/pool.d/nextcloud.conf
new file mode 100644
index 0000000..dfbb8bf
--- /dev/null
+++ b/roles/nextcloud/files/etc/php/fpm/pool.d/nextcloud.conf
@@ -0,0 +1,17 @@
+[nextcloud]
+user = _nextcloud
+group = nogroup
+listen = /run/php/php7.3-fpm@nextcloud.sock
+listen.owner = www-data
+listen.group = www-data
+listen.mode = 0600
+pm = dynamic
+pm.max_children = 5
+pm.start_servers = 2
+pm.min_spare_servers = 1
+pm.max_spare_servers = 3
+env[HOSTNAME] = $HOSTNAME
+env[PATH] = /usr/bin:/bin
+env[TMP] = /tmp
+env[TMPDIR] = /tmp
+env[TEMP] = /tmp
diff --git a/roles/nextcloud/tasks/main.yml b/roles/nextcloud/tasks/main.yml
index 86b505b..8878987 100644
--- a/roles/nextcloud/tasks/main.yml
+++ b/roles/nextcloud/tasks/main.yml
@@ -29,18 +29,25 @@
   notify:
     - Restart php7.3-fpm
 
-- name: Configure PHP 7.3 pool environment
-  lineinfile: dest=/etc/php/7.3/fpm/pool.d/www.conf
-              regexp='^;?env\[{{ item.var }}\]\\s*='
-              line="env[{{ item.var }}] = {{ item.value }}"
-              owner=root group=root
-              mode=0644
-  with_items:
-    - { var: HOSTNAME, value: "$HOSTNAME"     }
-    - { var: PATH,     value: "/usr/bin:/bin" }
-    - { var: TMP,      value: "/tmp"          }
-    - { var: TMPDIR,   value: "/tmp"          }
-    - { var: TEMP,     value: "/tmp"          }
+- name: Create '_nextcloud' user
+  user: name=_nextcloud system=yes
+        group=nogroup
+        createhome=no
+        home=/nonexistent
+        shell=/usr/sbin/nologin
+        password=!
+        state=present
+
+- name: Delete PHP 7.3 FPM's www pool
+  file: path=/etc/php/7.3/fpm/pool.d/www.conf state=absent
+  notify:
+    - Restart php7.3-fpm
+
+- name: Configure PHP 7.3 FPM's nextcloud pool
+  copy: src=etc/php/fpm/pool.d/nextcloud.conf
+        dest=/etc/php/7.3/fpm/pool.d/nextcloud.conf
+        owner=root group=root
+        mode=0644
   notify:
     - Restart php7.3-fpm
 
@@ -102,6 +109,15 @@
   tags:
     - ldap
 
+# Note: intentionally don't set an owner/group as we don't want to set
+# ownership unless the path is a mountpoint.  The service will fail
+# unless the data directory is mounted and accessible, and that's what
+# we want.
+- name: Create directory /mnt/nextcloud-data
+  file: path=/mnt/nextcloud-data
+        state=directory
+        mode=0700
+
 - name: Create directory /var/www/nextcloud
   file: path=/var/www/nextcloud
         state=directory
@@ -114,19 +130,19 @@
 - name: Create directory /var/www/nextcloud/apps
   file: path=/var/www/nextcloud/apps
         state=directory
-        owner=www-data group=www-data
+        owner=_nextcloud group=nogroup
         mode=0755
 
 - name: Create directory /var/log/nextcloud
   file: path=/var/log/nextcloud
         state=directory
-        owner=www-data group=adm
+        owner=_nextcloud group=adm
         mode=0750
 
 - name: Create directory /var/cache/nextcloud
   file: path=/var/cache/nextcloud
         state=directory
-        owner=www-data group=www-data
+        owner=_nextcloud group=nogroup
         mode=0700
 
 - name: Copy Nextcloud logrotate snippet
@@ -160,7 +176,7 @@
 - name: Start redis-server
   service: name=redis-server state=started
 
-- name: Add 'www-data' to the group 'redis'
-  user: name=www-data groups=redis append=yes
+- name: Add '_nextcloud' user to 'redis' group
+  user: name=_nextcloud groups=redis append=yes
   notify:
     - Restart php7.3-fpm