tty7/docs/remote/ssh.mdx

---
title: "SSH"
description: "A native Rust SSH stack: quick connects, saved profiles, keychain credentials, jump hosts."
---

tty7 speaks SSH itself, over [russh](https://github.com/Eugeny/russh). It never
shells out to the `ssh` binary, and there is no compatibility mode that does.

That is what makes the rest possible: credentials in the OS keychain,
[SFTP](/remote/sftp) in a side panel, [port forwards](/remote/port-forwarding)
you can add mid-session, and authentication prompts drawn as sheets in the pane
instead of a password echoing into your shell.

<Frame caption="Placeholder — screenshot: an SSH connection sheet asking for a key passphrase inside a pane">
  <img src="/images/placeholder.svg" alt="Connecting over SSH in tty7" />
</Frame>

## Four ways to connect

<AccordionGroup>
  <Accordion title="QuickConnect — type an address">
    Open the palette (<kbd>⌘ P</kbd>) and type an address. IPv6 works with
    brackets.

    ```
    me@devbox
    me@devbox:2222
    me@[2001:db8::1]:22
    ```
  </Accordion>

  <Accordion title="A saved profile">
    Profiles live in **Settings → SSH → Hosts**. Start typing the name in the
    palette, or open the *SSH: Manage Profiles…* command.
  </Accordion>

  <Accordion title="An alias from ~/.ssh/config">
    Type an alias you already have and tty7 resolves it natively — common fields,
    best effort — then connects over russh. **Settings → SSH → Import from
    ~/.ssh/config** turns aliases into real profiles.

    <Note>
      `Match`, `canonicalize*`, and GSSAPI directives are not supported, and
      there is no fallback to the system `ssh` when one appears.
    </Note>
  </Accordion>

  <Accordion title="A remote workspace">
    The same connection can host whole workspaces on the far machine rather than
    a single shell. [Remote workspaces →](/remote/workspaces)
  </Accordion>
</AccordionGroup>

## Profiles

**Settings → SSH → Hosts** holds the full connection config. The basics:

| Field | |
|---|---|
| **Name** | A label for this connection |
| **Host** | Hostname or IP |
| **User** | Login user — blank resolves at connect time |
| **Auth** | *Auto* (tries every applicable method), *GSSAPI*, *Password*, *Key*, *Agent*, or *2FA* |
| **Jump host** | Another profile, or a `ProxyJump` chain |
| **Port forwarding** | Rules opened with the connection |

**Defaults** at the top of the list is inherited by every host, so a setting you
want everywhere is set once.

Passwords and key passphrases go in the **OS keychain**, never in
`config.json` and never on disk in plain text. **Forget Password** in a
profile's menu removes the stored one.

Deleting a profile drops its keychain credentials and forgets the remote
workspace entries that connected through it — the confirmation counts them
first. The sessions on the machine itself keep running; [what happens to its
entries →](/remote/workspaces#deleting-a-profile)

### Advanced

Behind **Advanced** on a profile, grouped:

| Group | Fields |
|---|---|
| **Authentication** | Identity files (one path per line, `%h`/`%r` expand), agent forwarding |
| **Proxies** | ProxyCommand (`%h`/`%p`/`%r` substituted), SOCKS5 proxy, HTTP proxy |
| **Algorithms** | KEX algorithms, ciphers, MACs, host-key algorithms, compression |
| **Connection** | Keepalive interval and count, connect timeout, X11 forwarding |
| **Session** | Shell integration, login scripts, skip banner |
| **Security** | Host-key verification, remote clipboard image writes |

Everything blank means "the library default", so you only fill in what you
actually need to override.

## Copying a remote image to this machine

Programs on an SSH host can write PNG, JPEG, GIF, or WebP images to the system
clipboard on the machine running tty7 with the OSC 5522 clipboard protocol.
Enable **Advanced → Security → Remote clipboard images** for that saved host
first. It is off by default because any program that writes terminal output
would otherwise be able to replace the clipboard.

This Python script can be installed on the remote host as
`tty7-copy-image`:

```python
#!/usr/bin/env python3
import base64
import os
import pathlib
import re
import select
import secrets
import sys
import termios
import time
import tty

path = pathlib.Path(sys.argv[1])
mime = {
    ".png": "image/png",
    ".jpg": "image/jpeg",
    ".jpeg": "image/jpeg",
    ".gif": "image/gif",
    ".webp": "image/webp",
}.get(path.suffix.lower())
if mime is None:
    raise SystemExit("supported formats: png, jpg, jpeg, gif, webp")

data = path.read_bytes()
if len(data) > 16 * 1024 * 1024:
    raise SystemExit("image exceeds tty7's 16 MiB clipboard limit")

osc, st = b"\x1b]5522;", b"\x1b\\"
encoded_mime = base64.b64encode(mime.encode())
request_id = secrets.token_hex(8)
out = sys.stdout.buffer
fd = sys.stdin.fileno()
old = termios.tcgetattr(fd)
status = None
try:
    tty.setraw(fd)
    rid = request_id.encode()
    out.write(osc + b"type=write:id=" + rid + st)
    for offset in range(0, len(data), 4096):
        chunk = base64.b64encode(data[offset:offset + 4096])
        out.write(
            osc + b"type=wdata:id=" + rid + b":mime=" + encoded_mime + b";" + chunk + st
        )
    out.write(osc + b"type=wdata:id=" + rid + st)
    out.flush()

    reply = bytearray()
    pattern = re.compile(
        rb"\x1b\]5522;type=write:status=([A-Z]+):id=" + rid + rb"\x1b\\"
    )
    deadline = time.monotonic() + 5
    while time.monotonic() < deadline:
        ready, _, _ = select.select([fd], [], [], deadline - time.monotonic())
        if not ready:
            break
        reply.extend(os.read(fd, 4096))
        match = pattern.search(reply)
        if match:
            status = match.group(1).decode()
            break
finally:
    termios.tcsetattr(fd, termios.TCSADRAIN, old)

if status != "DONE":
    raise SystemExit(f"clipboard write failed: {status or 'timeout'}")
```

Run `tty7-copy-image screenshot.png`. A compliant sender may include an OSC
5522 request id and wait for tty7's `DONE`, `EPERM`, `EINVAL`, or `ENOSYS`
response. Clipboard control packets are not retained in scrollback and are not
replayed after reconnecting.

## Authentication prompts

Password, key passphrase, and 2FA prompts appear as sheets inside the pane, with
a **Remember (keychain)** option where it makes sense.

## Host keys

Host keys are verified against `known_hosts` by default. A first connection asks
you to confirm the fingerprint; a **changed** key is a much louder prompt that
makes you type `yes` to override, because that is what a changed key deserves.

**Settings → SSH → Security → Verify host keys** turns verification off
entirely. It is on for a reason.

Also under Security: **Warn before closing** a live connection, off by default.

## Reconnecting

<kbd>⌘ ⇧ R</kbd> — or *SSH: Reconnect* in the palette — restarts the session in
the current pane. Useful after a laptop sleeps or a network changes.

## What is not supported

- No fallback to the system `ssh` binary
- No `Match` or `canonicalize*` directives from `~/.ssh/config`
- No GSSAPI *directives* from `~/.ssh/config`. Kerberos `gssapi-with-mic` itself
  is supported — pick **GSSAPI** in a profile's Auth field — it is just not
  something the config-file resolution path reads