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

@@ -16,3 +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.yml

@@ -1,11 +1,13 @@
 version: "3.8"
 services:
   web:
-    image: nginx:1.21.6
+    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:
@@ -33,16 +35,22 @@ services:
         - "traefik.http.middlewares.${STACK_NAME}-redirect.headers.SSLHost=${DOMAIN}"
 
   app:
-    image: nextcloud:24.0.0-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
       - NEXTCLOUD_ADMIN_USER=${ADMIN_USER}
@@ -69,13 +77,12 @@ services:
         failure_action: rollback
         order: start-first
       labels:
-        - "coop-cloud.${STACK_NAME}.version=2.1.0+24.0.0-fpm"
+        - "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:24.0.0-fpm
+    image: nextcloud:24.0.3-fpm
     volumes:
       - nextcloud:/var/www/html/
       - nextapps:/var/www/html/custom_apps:cached
@@ -87,7 +94,7 @@ services:
     entrypoint: /cron.sh
 
   cache:
-    image: redis:7.0.0-alpine
+    image: redis:7.0.4-alpine
     networks:
       - internal
     volumes:
@@ -111,6 +118,7 @@ volumes:
   nextconfig:
   redis:
 
+
 configs:
   nginx_conf:
     name: ${STACK_NAME}_nginx_${NGINX_CONF_VERSION}
@@ -119,6 +127,10 @@ configs:
   fpm_tune:
     name: ${STACK_NAME}_fpm_tune_${FPM_TUNE_VERSION}
     file: fpm-tune.ini
+  entrypoint:
+    name: ${STACK_NAME}_entrypoint_${ENTRYPOINT_VERSION}
+    file: entrypoint.sh.tmpl
+    template_driver: golang
 
 networks:
   proxy:

configure_nextcloud.sh

@@ -1,55 +0,0 @@
-#!/bin/bash
-
-set -eu
-
-app_name=$1
-domain=$2
-secret=$3
-
-sub_occ(){
-abra app run --user www-data $app_name app /var/www/html/occ "$@"
-}
-
-# Install apps
-sub_occ app:install calendar || true
-sub_occ app:install sociallogin || true
-sub_occ app:install onlyoffice || true
-
-# Disable Dashboard
-sub_occ app:disable dashboard || true
-
-# Configure SSO
-
-sub_occ config:app:set sociallogin custom_providers --value="
-{
-  \"custom_oidc\": [
-    {
-      \"name\": \"authentik\",
-      \"title\": \"Login\",
-      \"authorizeUrl\": \"https://$domain/application/o/authorize/\",
-      \"tokenUrl\": \"https://$domain/application/o/token/\",
-      \"displayNameClaim\": \"preferred_username\",
-      \"userInfoUrl\": \"https://$domain/application/o/userinfo/\",
-      \"logoutUrl\": \"https://$domain/application/o/nextcloud/end-session/\",
-      \"clientId\": \"nextcloud\",
-      \"clientSecret\": \"$secret\",
-      \"scope\": \"openid profile email nextcloud\",
-      \"groupsClaim\": \"nextcloud_groups\",
-      \"style\": \"openid\",
-      \"defaultGroup\": \"\",
-      \"groupMapping\": {
-        \"admin\": \"admin\"
-      }
-    }
-  ]
-}"
-
-sub_occ config:app:set sociallogin update_profile_on_login --value 1
-sub_occ config:app:set sociallogin auto_create_groups --value 1
-sub_occ config:app:set sociallogin hide_default_login --value 1
-
-sub_occ config:system:set allow_user_to_change_display_name --value=false
-sub_occ config:system:set lost_password_link --value=disabled
-sub_occ config:system:set social_login_auto_redirect --value=true
-
-abra app run --user www-data $app_name app cat config/config.php

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;