CHP Docker - permission denied on ssl cert key with properly configured permissions

[pa5446530a]

Bug description

CHP run from Docker image cannot read certificate key with proper permissions.

Expected behaviour

The certificate key is properly read and proxy runs.

Actual behaviour

The proxy startup fails with permission denied on the cert key.

How to reproduce

Have ssl cert keys saved in /etc/ssl/private with proper permissions /etc/ssl:ro is passed into the CHP container Full path to a certificate key located in /etc/ssl/private is passed via --ssl-key The key and containing dir have properly set permissions to 600 Try to run CHP as standalone container Observe permission error in logs

Cert key is read fine when CHP is run as part of Jupyterhub in one container.

Your personal set up

• OS: Ubuntu 20.04
• Version(s): CHP Docker image jupyterhub/configurable-http-proxy:4 Jupyterhub Docker image jupyterhub/jupyterhub:3.0.0

Full environment

``` # paste output of `pip freeze` or `conda list` here ```

Configuration

docker-compose snippet ``` image: jupyterhub/configurable-http-proxy:4 volumes: - /etc/ssl/:/etc/ssl:ro command: > configurable-http-proxy --port 443 --redirect-port 80 --api-port 8001 --metrics-port 9500 --default-target jhub --ssl-cert /etc/ssl/certs/jhub-domain-cert.pem --ssl-key /etc/ssl/private/jhub-domain-cert.key ```

Logs

``` jhub_proxy | node:internal/fs/utils:347 jhub_proxy | throw err; jhub_proxy | ^ jhub_proxy | jhub_proxy | Error: EACCES: permission denied, open '/etc/ssl/private/jhub-domain-cert.key' jhub_proxy | at Object.openSync (node:fs:594:3) jhub_proxy | at Object.readFileSync (node:fs:462:35) jhub_proxy | at Object. (/srv/configurable-http-proxy/bin/configurable-http-proxy:188:26) jhub_proxy | at Module._compile (node:internal/modules/cjs/loader:1126:14) jhub_proxy | at Object.Module._extensions..js (node:internal/modules/cjs/loader:1180:10) jhub_proxy | at Module.load (node:internal/modules/cjs/loader:1004:32) jhub_proxy | at Function.Module._load (node:internal/modules/cjs/loader:839:12) jhub_proxy | at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12) jhub_proxy | at node:internal/main/run_main_module:17:47 { jhub_proxy | errno: -13, jhub_proxy | syscall: 'open', jhub_proxy | code: 'EACCES', jhub_proxy | path: '/etc/ssl/private/jhub-domain-cert.key' jhub_proxy | } ```

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[minrk]

The CHP container doesn't run as root by default, it runs as nobody. So mounting something 600 means the CHP process probably can't read it by default. You can set the uid of the process with standard docker methods (docker run --user ...) to the user you want it to be so that it can read your files. The UID and fs permissions you choose to achieve this are up to you.