add headers to embed nextcloud in frame on external site

This introduces new env variables to configure nextloud to be embedded via
iframe on an external site.
Setting X_FRAME_OPTIONS_ENABLED=1 will configure nginx and nextcloud to
set X-Frame-Options and CSP headers to allow the domain configured in
X_FRAME_OPTIONS_ALLOW_FROM.

.env.sample

@@ -5,6 +5,10 @@ DOMAIN=nextcloud.example.com
 #EXTRA_DOMAINS=', `www.nextcloud.example.com`'
 LETS_ENCRYPT_ENV=production
 
+COMPOSE_FILE="compose.yml"
+COMPOSE_FILE="$COMPOSE_FILE:compose.mariadb.yml"
+#COMPOSE_FILE="$COMPOSE_FILE:compose.postgres.yml"
+
 ADMIN_USER=admin
 
 SECRET_DB_ROOT_PASSWORD_VERSION=v1
@@ -12,3 +16,6 @@ SECRET_DB_PASSWORD_VERSION=v1
 SECRET_ADMIN_PASSWORD_VERSION=v1
 
 EXTRA_VOLUME=/dev/null:/tmp/.dummy
+
+# X_FRAME_OPTIONS_ENABLED=1
+# X_FRAME_OPTIONS_ALLOW_FROM=embedding-site.example.org

README.md

@@ -166,3 +166,27 @@ Here is an example CSS config which hides the local login and makes space for a
 [nextcloud-docker]: https://hub.docker.com/_/nextcloud/
 [`abra`]: https://git.autonomic.zone/autonomic-cooperative/abra
 [`coop-cloud/traefik`]: https://git.autonomic.zone/coop-cloud/traefik
+
+## Using [`previewgenerator`](https://github.com/nextcloud/previewgenerator) app
+
+> Beware, this appp has been known to not work...
+
+After you install, enable etc. then you need to run the generation (**warning**: it can take a long time!):
+
+```
+abra app run <domain> app bash -u www-data
+./occ preview:generate-all
+```
+
+To set up the cron to run again, there is [no clear solution in the context of
+containers](https://github.com/nextcloud/previewgenerator/issues/1). So, a
+pretty dodgy hack is to run it from the system directly:
+
+```
+root@foo.com /etc/cron.hourly $ cat foo-com-preview-generate 
+#!/bin/bash
+
+docker exec -u www-data $(docker ps -f name=foo_com_app -q) ./occ preview:pre-generate
+```
+
+This app will improve performance of image browsing at the cost of storage space.

abra.sh

@@ -1,6 +1,7 @@
 export FPM_TUNE_VERSION=v4
-export NGINX_CONF_VERSION=v2
+export NGINX_CONF_VERSION=v3
 export MY_CNF_VERSION=v4
+export ENTRYPOINT_VERSION=v1
 
 NC_APP_DIR="app:/var/www/html"
 

compose.mariadb.yml

@@ -0,0 +1,40 @@
+version: "3.8"
+
+services:
+  app:
+    environment:
+      - MYSQL_HOST=db
+      - MYSQL_DATABASE=nextcloud
+      - MYSQL_USER=nextcloud
+      - MYSQL_PASSWORD_FILE=/run/secrets/db_password
+
+  db:
+    image: "mariadb:10.5"
+    environment:
+      - MYSQL_DATABASE=nextcloud
+      - MYSQL_USER=nextcloud
+      - MYSQL_PASSWORD_FILE=/run/secrets/db_password
+      - MYSQL_ROOT_PASSWORD_FILE=/run/secrets/db_root_password
+    configs:
+      - source: my_tune
+        target: /etc/mysql/conf.d/my-tune.cnf
+    secrets:
+      - db_root_password
+      - db_password
+    volumes:
+      - "mariadb:/var/lib/mysql"
+    networks:
+      - internal
+    deploy:
+      labels:
+          backupbot.backup: "true"
+          backupbot.backup.pre-hook: 'mkdir -p /tmp/backup/ && mysqldump --single-transaction -u root -p"$$(cat /run/secrets/db_root_password)" nextcloud > /tmp/backup/backup.sql'
+          backupbot.backup.post-hook: "rm -rf /tmp/backup"
+          backupbot.backup.path: "/tmp/backup/"
+configs:
+  my_tune:
+    name: ${STACK_NAME}_my_cnf_${MY_CNF_VERSION}
+    file: my-tune.cnf
+
+volumes:
+  mariadb:

compose.postgres.yml

@@ -0,0 +1,38 @@
+version: '3.8'
+
+services:
+  app:
+    entrypoint: "sh -c 'sleep 10 && /entrypoint.sh php-fpm'" # tries to mitigate this error with postgres https://github.com/nextcloud/docker/issues/1204
+    environment:
+      - POSTGRES_HOST=db
+      - POSTGRES_DB=nextcloud
+      - POSTGRES_USER=nextcloud
+      - POSTGRES_PASSWORD_FILE=/run/secrets/db_password
+      - NEXTCLOUD_UPDATE=1
+
+  db:
+    image: "postgres:12"
+    volumes:
+      - "postgres:/var/lib/postgresql/data"
+    networks:
+      - internal
+    environment:
+      POSTGRES_USER: nextcloud 
+      POSTGRES_PASSWORD_FILE: /run/secrets/db_password
+      POSTGRES_DB: nextcloud 
+    secrets:
+      - db_password
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    deploy:
+      labels:
+            backupbot.backup: "true"
+            backupbot.backup.pre-hook: "mkdir -p /tmp/backup/ && PGPASSWORD=$$(cat $${POSTGRES_PASSWORD_FILE}) pg_dump -U $${POSTGRES_USER} $${POSTGRES_DB} > /tmp/backup/backup.sql"
+            backupbot.backup.post-hook: "rm -rf /tmp/backup"
+            backupbot.backup.path: "/tmp/backup/"
+
+volumes:
+  postgres:

compose.yml

@@ -1,11 +1,13 @@
 version: "3.8"
 services:
   web:
-    image: nginx:1.20.0
+    image: nginx:1.23.1
     configs:
       - source: nginx_conf
         target: /etc/nginx/nginx.conf
     environment:
+      - X_FRAME_OPTIONS_ALLOW_FROM
+      - X_FRAME_OPTIONS_ENABLED
       - DOMAIN
       - STACK_NAME
     volumes:
@@ -33,22 +35,24 @@ services:
         - "traefik.http.middlewares.${STACK_NAME}-redirect.headers.SSLHost=${DOMAIN}"
 
   app:
-    image: nextcloud:23.0.1-fpm
+    image: nextcloud:24.0.3-fpm
     depends_on:
       - db
     configs:
       - source: fpm_tune
         target: /usr/local/etc/php-fpm.d/fpm-tune.conf
+      - source: entrypoint
+        target: /custom-entrypoint.sh
+        mode: 555
+    entrypoint: /custom-entrypoint.sh
     secrets:
       - db_password
       - admin_password
     environment:
+      - X_FRAME_OPTIONS_ALLOW_FROM
+      - X_FRAME_OPTIONS_ENABLED
       - DOMAIN
       - STACK_NAME
-      - MYSQL_HOST=db
-      - MYSQL_DATABASE=nextcloud
-      - MYSQL_USER=nextcloud
-      - MYSQL_PASSWORD_FILE=/run/secrets/db_password
       - NEXTCLOUD_ADMIN_USER=${ADMIN_USER}
       - NEXTCLOUD_ADMIN_PASSWORD_FILE=/run/secrets/admin_password
       - NEXTCLOUD_TRUSTED_DOMAINS=${DOMAIN}
@@ -73,28 +77,12 @@ services:
         failure_action: rollback
         order: start-first
       labels:
-        - "coop-cloud.${STACK_NAME}.version=1.0.0+23.0.1-fpm"
-
-  db:
-    image: "mariadb:10.5"
-    environment:
-      - MYSQL_DATABASE=nextcloud
-      - MYSQL_USER=nextcloud
-      - MYSQL_PASSWORD_FILE=/run/secrets/db_password
-      - MYSQL_ROOT_PASSWORD_FILE=/run/secrets/db_root_password
-    configs:
-      - source: my_tune
-        target: /etc/mysql/conf.d/my-tune.cnf
-    secrets:
-      - db_root_password
-      - db_password
-    volumes:
-      - "mariadb:/var/lib/mysql"
-    networks:
-      - internal
+        - "coop-cloud.${STACK_NAME}.version=2.1.2+24.0.3-fpm"
+        - "backupbot.backup=true"
+        - "backupbot.backup.path=/var/www/html/config/,/var/www/html/data/,/var/www/html/custom_apps/"
 
   cron:
-    image: nextcloud:23.0.1-fpm
+    image: nextcloud:24.0.3-fpm
     volumes:
       - nextcloud:/var/www/html/
       - nextapps:/var/www/html/custom_apps:cached
@@ -106,7 +94,7 @@ services:
     entrypoint: /cron.sh
 
   cache:
-    image: redis:6.2.5-alpine
+    image: redis:7.0.4-alpine
     networks:
       - internal
     volumes:
@@ -128,9 +116,9 @@ volumes:
   nextapps:
   nextdata:
   nextconfig:
-  mariadb:
   redis:
 
+
 configs:
   nginx_conf:
     name: ${STACK_NAME}_nginx_${NGINX_CONF_VERSION}
@@ -139,9 +127,10 @@ configs:
   fpm_tune:
     name: ${STACK_NAME}_fpm_tune_${FPM_TUNE_VERSION}
     file: fpm-tune.ini
-  my_tune:
-    name: ${STACK_NAME}_my_cnf_${MY_CNF_VERSION}
-    file: my-tune.cnf
+  entrypoint:
+    name: ${STACK_NAME}_entrypoint_${ENTRYPOINT_VERSION}
+    file: entrypoint.sh.tmpl
+    template_driver: golang
 
 networks:
   proxy:

entrypoint.sh.tmpl

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+{{ if eq (env "X_FRAME_OPTIONS_ENABLED") "1" }}
+if ! [[ $(grep {{ env "X_FRAME_OPTIONS_ALLOW_FROM" }} lib/public/AppFramework/Http/ContentSecurityPolicy.php) ]]; then
+    sed -i "91 a\\\t\t'{{ env "X_FRAME_OPTIONS_ALLOW_FROM" }}', " lib/public/AppFramework/Http/ContentSecurityPolicy.php
+fi
+{{ end }}
+
+/entrypoint.sh php-fpm

nginx.conf.tmpl

@@ -41,6 +41,7 @@ http {
         # could take several months.
         #add_header Strict-Transport-Security "max-age=15768000; includeSubDomains; preload;" always;
 
+
         # set max upload size
         client_max_body_size 512M;
         fastcgi_buffers 64 4K;
@@ -61,11 +62,18 @@ http {
         add_header Referrer-Policy                      "no-referrer"   always;
         add_header X-Content-Type-Options               "nosniff"       always;
         add_header X-Download-Options                   "noopen"        always;
-        add_header X-Frame-Options                      "SAMEORIGIN"    always;
         add_header X-Permitted-Cross-Domain-Policies    "none"          always;
         add_header X-Robots-Tag                         "none"          always;
         add_header X-XSS-Protection                     "1; mode=block" always;
 
+        {{ if eq (env "X_FRAME_OPTIONS_ENABLED") "1" }}
+        add_header X-Frame-Options                      "{{ env "X_FRAME_OPTIONS_ALLOW_FROM" }}"    always;
+        add_header Content-Security-Policy              "frame-ancestors {{ env "X_FRAME_OPTIONS_ALLOW_FROM" }}";
+        {{ else }}
+        add_header X-Frame-Options                      "SAMEORIGIN"    always;
+        {{ end }}
+
+
         # Remove X-Powered-By, which is an information leak
         fastcgi_hide_header X-Powered-By;
 

releases/2.0.0+23.0.3-fpm

@@ -0,0 +1,6 @@
+2.0.0 introduces a minor nextcloud update to 23.0.4 and moves the database service to a seperate override.yml file to support different database types (mariadb / postgres). This might break your installation. Please add the following snippet to your config .env to ensure the right db is used:
+
+```
+COMPOSE_FILE="compose.yml"
+COMPOSE_FILE="$COMPOSE_FILE:compose.mariadb.yml"
+```