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docs: restrict file transfers from workspaces #13534

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33 changes: 33 additions & 0 deletions docs/faqs.md
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Expand Up @@ -501,3 +501,36 @@ Note that the JetBrains Gateway configuration blocks for each host in your SSH
config file will be overwritten by the JetBrains Gateway client when it
re-authenticates to your Coder deployment so you must add the above config as a
separate block and not add it to any existing ones.

### How can I restrict inbound/outbound file transfers from Coder workspaces?

In certain environments, it is essential to keep confidential files within
workspaces and prevent users from uploading or downloading resources using tools
like `scp` or `rsync`.

To achieve this, template admins can use the environment variable
`CODER_AGENT_BLOCK_FILE_TRANSFER` to enable additional SSH command controls.
This variable allows the system to check if the executed application is on the
block list, which includes `scp`, `rsync`, `ftp`, and `nc`.

```hcl
resource "docker_container" "workspace" {
...
env = [
"CODER_AGENT_TOKEN=${coder_agent.main.token}",
"CODER_AGENT_BLOCK_FILE_TRANSFER=true",
...
]
}
```

#### Important Notice

This control operates at the `ssh-exec` level or during `sftp` sessions. While
it can help prevent automated file transfers using the specified tools, users
can still SSH into the workspace and manually initiate file transfers. The
primary purpose of this feature is to warn and discourage users from downloading
confidential resources to their local machines.

For more advanced security needs, consider adopting an endpoint security
solution.
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