I’ve been working on adding security headers to my reverse proxy and so far I believe to have gotten most of them except for Content Security Policies, I honestly can’t find a simplified way to apply a CSP to 20+ docker applications and hope folks of Lemmy know the best way to go about this.

I want to note that I never worked with headers in the past, I tried interpreting the Traefik documentation and Mozilla documentation as well as a bunch of random YT videos but can’t seem to get it right.

    headers:
      headers:
        customRequestHeaders:
          X-Forwarded-Proto: https
        accessControlAllowMethods:
          - GET
          - OPTIONS
          - PUT
        accessControlMaxAge: 100
        hostsProxyHeaders:
          - "X-Forwarded-Host"
        stsSeconds: 31536000
        stsIncludeSubdomains: true
        stsPreload: true
        forceSTSHeader: true # This is a good thing but it can be tricky. Enable after everything works.
        customFrameOptionsValue: SAMEORIGIN # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
        contentTypeNosniff: true
        browserXssFilter: true
        contentSecurityPolicy: ""
        referrerPolicy: "same-origin"
        permissionsPolicy: "camera=(), microphone=(), geolocation=(), usb=()"
        customResponseHeaders:
          X-Robots-Tag: "none,noarchive,nosnippet,notranslate,noimageindex," # disable search engines from indexing home server
          server: "traefik"
  • ohshit604@sh.itjust.worksOPEnglish
    1·
    3 days ago

    Ah bless!

    I’ve been using Firefox extensions to make up my CSP’s and so far it’s been an absolute nightmare! Thank you for this tool!

      • ohshit604@sh.itjust.worksOPEnglish
        1·
        3 days ago

        Is there any special configuration needed for it? Env variables, network interface, volumes & config files, etc?

        I plan to set this up in a docker-compose file later this afternoon once I get some free time.

        • Matt The Horwood@lemmy.horwood.cloudEnglish
          1·
          3 days ago

          theres no config for it, it listens on port 8080. I need to expose the logs dir, but not done that yet. So all the logs will only be in the container, but you could point a mount at /var/www/html/logs

          • ohshit604@sh.itjust.worksOPEnglish
            1·
            3 days ago

            Hey there! Following up on this, i got your application started however, it seems that this is more for folks who actually know PHP an HTML and less for folks like myself who just find Docker applications (Invidious, Homepage, RedLib) spin them up and rig them to work with one another so i don’t think this will work for me personally at the moment in time regardless seems like a great tool nonetheless!

            Thanks again!

              • ohshit604@sh.itjust.worksOPEnglish
                1·
                2 days ago

                Okay so going at it again, i think i now understand the reason for the Docker label now, here is my current docker-compose.yml i made some tweaks to the one from your github but i can’t seem to get a log file to generate.

                I suspected it was a permissions issue on the volume mount so i ran chmod 777 on the ./config/csp directory but still wont get a log file.

                Volume directory permissions:

                user@debian:~/compose$ ls config/ | grep csp; ls config/csp/; ls config/csp/logs/
drwxrwxrwx  3 user user 4096 Aug  9 09:11 csp
total 12
drwxrwxrwx  3 user user 4096 Aug  9 09:11 .
drwxr-xr-x 44 user user 4096 Aug  8 16:41 ..
drwxrwxrwx  2 user user 4096 Aug  9 09:04 logs
total 8
drwxrwxrwx 2 user user 4096 Aug  9 09:04 .
drwxrwxrwx 3 user user 4096 Aug  9 09:11 ..

                docker-compose.yml:

                  csp-report:
    image: mhzawadi/csp-report
    networks:
      main:
        ipv4_address: 172.18.0.38
    #ports:
     # - "8432:8080"
    ports:
      - target: 8080
        published: 8432
        mode: host
    container_name: csp-report
    environment:
      - TZ=America/Vancouver
    labels:
      - "csp_report.url=192.168.1.199:3000"
    volumes:
      - ./config/csp/logs:/var/www/html/logs

                Logs from the docker container:

                user@debian:~/compose$ sudo docker compose up -d csp-report --force-recreate; sudo docker logs csp-report -f
WARN[0000] The "POSTGRES_DB" variable is not set. Defaulting to a blank string. 
[+] Running 1/1
 ✔ Container csp-report  Started                                                                                                             0.5s 
/config/start.sh: Launching Unit daemon to perform initial configuration...
2025/08/09 16:21:18 [info] 12#12 unit 1.34.1 started
2025/08/09 16:21:18 [info] 14#14 discovery started
BusyBox v1.37.0 (2025-08-05 16:42:11 UTC) multi-call binary.

Usage: seq [-w] [-s SEP] [FIRST [INC]] LAST

Print numbers from FIRST to LAST, in steps of INC.
FIRST, INC default to 1.

        -w      Pad with leading zeros
        -s SEP  String separator
2025/08/09 16:21:18 [notice] 14#14 module: php 8.4.2 "/usr/lib/unit/modules/php84.unit.so"
2025/08/09 16:21:18 [info] 13#13 controller started
2025/08/09 16:21:18 [notice] 13#13 process 14 exited with code 0
2025/08/09 16:21:18 [info] 18#18 router started
2025/08/09 16:21:18 [info] 18#18 OpenSSL 3.3.4 1 Jul 2025, 30300040
{
        "certificates": {},
        "config": {
                "listeners": {},
                "routes": [],
                "applications": {}
        },

        "status": {
                "modules": {
                        "php": {
                                "version": "8.4.2",
                                "lib": "/usr/lib/unit/modules/php84.unit.so"
                        }
                },

                "connections": {
                        "accepted": 0,
                        "active": 0,
                        "idle": 0,
                        "closed": 0
                },

                "requests": {
                        "total": 0
                },

                "applications": {}
        }
}
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
2025/08/09 16:21:18 [info] 20#20 "csp_report" prototype started
2025/08/09 16:21:18 [info] 21#21 "csp_report" application started
{
        "success": "Reconfiguration done."
}
100   413  100    43  100   370   2808  24162 --:--:-- --:--:-- --:--:-- 27533
/config/start.sh: Stopping Unit daemon after initial configuration...
2025/08/09 16:21:18 [notice] 13#13 process 17 exited with code 0
2025/08/09 16:21:18 [notice] 20#20 app process 21 exited with code 0
2025/08/09 16:21:18 [alert] 20#20 sendmsg(13, -1, -1, 2) failed (32: Broken pipe)
2025/08/09 16:21:18 [notice] 13#13 process 18 exited with code 0
2025/08/09 16:21:18 [notice] 13#13 process 20 exited with code 0
BusyBox v1.37.0 (2025-08-05 16:42:11 UTC) multi-call binary.

Usage: seq [-w] [-s SEP] [FIRST [INC]] LAST

Print numbers from FIRST to LAST, in steps of INC.
FIRST, INC default to 1.


/config/start.sh: Unit initial configuration complete; ready for start up...

        -w      Pad with leading zeros
        -s SEP  String separator
2025/08/09 16:21:18 [info] 1#1 unit 1.34.1 started
2025/08/09 16:21:18 [info] 31#31 discovery started
2025/08/09 16:21:18 [notice] 31#31 module: php 8.4.2 "/usr/lib/unit/modules/php84.unit.so"
2025/08/09 16:21:18 [info] 1#1 controller started
2025/08/09 16:21:18 [notice] 1#1 process 31 exited with code 0
2025/08/09 16:21:18 [info] 33#33 router started
2025/08/09 16:21:18 [info] 33#33 OpenSSL 3.3.4 1 Jul 2025, 30300040
2025/08/09 16:21:18 [info] 34#34 "csp_report" prototype started
2025/08/09 16:21:18 [info] 35#35 "csp_report" application started
127.0.0.1 - - [09/Aug/2025:16:21:23 +0000] "POST / HTTP/1.1" 200 7 "-" "curl/8.12.1"