dsh-terminal-panel

Terminal + SFTP tabs in the DeepSeek Harness (dsh) web conversation view. Run commands on the harness host machine directly from the browser — green-on-black classic terminal look, persistent cwd, sudo password prompt, command history — and browse/transfer files over the same SSH connection with an SFTP tab.

Features

• Terminal tab in every conversation view (对话 · 轨迹 · 终端 · SFTP ordering)
• SFTP tab right next to the terminal — file browser over the same SSH connection (same host / user / password / key, no second login): navigate directories, upload, download, create directories, delete files and empty directories
• Manual command execution on the host machine via the harness subprocess service
• Persistent working directory — plain cd works across commands (cd .., cd ~/x, relative paths, error messages for bad targets)
• sudo support — commands starting with sudo run with sudo -S; the panel masks the password field while sudo is waiting (type it at the bottom line and press Enter)
• Command history (↑/↓), Ctrl+C to interrupt the running command, clear screen, reset directory
• Two themes — classic green-on-black and modern black-on-white, toggled by a button next to the panel controls; the choice persists across reloads (localStorage) and applies to both tabs
• ANSI escape cleanup — raw escape sequences never reach the panel
• Output cap — 512 KiB rolling buffer, so long-running output cannot blow up memory

Install

The plugin ships as a dsh profile plugin. On the machine running dsh web:

# 1. Install the package into the web profile (git dependency; pnpm resolves it)
dsh plugin --profile web add <your-account>/dsh-terminal-panel

# 2. Register the plugin in the profile patch layer
cat >> ~/.dsh/profiles/web/cordis.patch.yml <<'EOF'

- insert:
    - id: dsh-terminal-panel
      name: 'dsh-terminal-panel'
      config:
        trustedHosts:
          - myhost.tailXXXX.ts.net   # optional: hosts allowed to drive the terminal
EOF

# 3. Restart the web app (adjust to how you run it)
systemctl --user restart dsh-web

Then hard-refresh (Ctrl+Shift+R) the dsh web page — the 终端 and SFTP tabs appear in the conversation view.

Configuration

Runtime configuration (no restart needed)

Open the 设置 button in either tab (or the first-run setup panel when no
target is configured) and set host / username / password / key path — the
Terminal and SFTP tabs share this one login. Settings persist in
~/.local/share/dsh-terminal-panel/config.json and take effect on the next
command — no cordis.patch.yml edits or service restarts. The panel lists
the host's detected addresses (Tailscale IP first) for convenience, and a
one-click key initialisation for localhost targets.

SFTP tab

The SFTP tab opens at the target user's home directory and offers:

• directory navigation (click, breadcrumbs, up button) with type/size columns
• a two-column grid, 20 items per page with 上一页/下一页 pager buttons —
  the panel stays the same height as the terminal (no scrolling)
• download files to the browser (saved via the browser download)
• upload files from the local machine (native file picker)
• new directory and delete (files, and empty directories only)

Transfers run through the system sftp client in batch mode, reusing the
terminal's SSH credentials — password auth works without extra prompts
(SSH_ASKPASS), key auth is used automatically when configured. The transfer
cap is 64 MB per file (the payload crosses the HTTP layer as base64); for
larger files use scp/rsync from the terminal tab. In local mode
(sshTarget empty) the SFTP tab shows a hint pointing to the settings panel.

SSH mode (why you want it)

When dsh runs sandboxed (bwrap/user namespace — the default on Linux), the
process cannot setuid, so sudo is unusable in local mode. In SSH mode
the panel keeps one persistent ssh -t session (pseudo-tty) per terminal,
exactly like an SSH client:

• commands run in the host namespace of the sshd server → setuid/sudo work
• sudo asks for the password only once per 15 minutes (credential cache
  is bound to the session's tty, just like a normal SSH terminal)
• cd and environment persist natively inside the session
• interactive programs (top, htop, …) work
• the same mechanism turns the panel into a remote terminal for any SSH host:

- insert:
    - id: dsh-terminal-panel
      name: 'dsh-terminal-panel'
      config:
        trustedHosts:
          - myhost.tailXXXX.ts.net
        sshTarget: [email protected]      # localhost: sudo works
        # sshTarget: user@remote-host   # or any SSH host
        sshIdentity: /home/<user>/.ssh/dsh-terminal

Set up the identity once (one command, no password prompts afterwards):

ssh-keygen -t ed25519 -N "" -f ~/.ssh/dsh-terminal
# allow shell access (no port forwarding etc.):
echo "restrict,no-user-rc $(cat ~/.ssh/dsh-terminal.pub)" >> ~/.ssh/authorized_keys
# for a remote target, add the same line to the target's authorized_keys

In SSH mode a completion marker is emitted after each command so the panel
knows when the remote command finished (it is stripped from the display).
Commands reading stdin (e.g. sudo -S) keep stdin open — type the password
in the panel and press Enter; the input is masked.

Security

⚠️ This plugin executes arbitrary commands on the harness host. Anyone who can reach the /sxec/* endpoints can run commands as the target user.

• Requests are accepted only from loopback hosts or hosts listed in trustedHosts (DNS-rebinding defence).
• There is no built-in authentication — protect the web server itself with a reverse-proxy auth layer (e.g. Caddy basic_auth) when exposing it beyond localhost.
• The SSH password (if configured) is stored in the user-level config.json (0600) and delivered to ssh via SSH_ASKPASS; prefer key auth on shared machines.
• The endpoint inherits the exposure of whatever fronts the dsh web server: bind it to loopback only, or put an authenticated proxy in front.

How it works

• Host half (lib/index.js): a dsh plugin that registers a /sxec/* route family on the harness webserver (term-init, term-run, term-send, term-signal, term-reset, term-read, term-config, term-init-key, sftp-init, sftp-list, sftp-mkdir, sftp-rm, sftp-download, sftp-upload). Commands run either locally via node:child_process (bypassing the harness subprocess sandbox) or through a persistent ssh -t pty session when sshTarget is configured; output is ANSI-sanitised and buffered. SFTP operations spawn short-lived sftp -b - batch processes with the same credentials.
• Client half (lib/client.js): registers the 终端 and SFTP slots in conversation.view and talks to the host via same-origin fetch('/sxec/*') calls (no WebSocket, no extra ports). Both tabs share one settings panel and one theme.

Development

git clone <your-account>/dsh-terminal-panel
# edit lib/index.js (host) / lib/client.js (client), then:
systemctl --user restart dsh-web   # host changes take effect immediately
# client changes need a hard refresh of the page

License

MIT