atmoz/sftp
==========

Easy to use SFTP ([SSH File Transfer Protocol](https://en.wikipedia.org/wiki/SSH_File_Transfer_Protocol)) server with [OpenSSH](https://en.wikipedia.org/wiki/OpenSSH). This is an automated build linked with the [debian](https://hub.docker.com/_/debian/) repository.

Usage
-----

- Define users as last arguments to `docker run`, one user per argument  
  (syntax: `user:pass[:e][:[uid][:gid]]`).
  - You must set custom UID for your users if you want them to make changes to
    your mounted volumes with permissions matching your host filesystem.
- Mount volumes in user's home folder.
  - The users are chrooted to their home directory, so you must mount the
    volumes in separate directories inside the user's home directory
    (/home/user/**mounted-directory**).

Examples
--------

### Single user and volume

```
docker run \
    -v /host/share:/home/foo/share \
    -p 2222:22 -d atmoz/sftp \
    foo:123:1001
```

#### Using Docker Compose:

```
sftp:
    image: atmoz/sftp
    volumes:
        - /host/share:/home/foo/share
    ports:
        - "2222:22"
    command: foo:123:1001
```

#### Logging in

The OpenSSH server runs by default on port 22, and in this example, we are
forwarding the container's port 22 to the host's port 2222. To log in with an
OpenSSH client, run: `sftp -P 2222 foo@<host-ip>`

### Multiple users and volumes

```
docker run \
    -v /host/share:/home/foo/share \
    -v /host/documents:/home/foo/documents \
    -v /host/http:/home/bar/http \
    -p 2222:22 -d atmoz/sftp \
    foo:123:1001 \
    bar:abc:1002
```

### Encrypted password

Add `:e` behind password to mark it as encrypted. Use single quotes.

```
docker run \
    -v /host/share:/home/foo/share \
    -p 2222:22 -d atmoz/sftp \
    'foo:$1$0G2g0GSt$ewU0t6GXG15.0hWoOX8X9.:e:1001'
```

Tip: you can use makepasswd to generate encrypted passwords:  
`echo -n 123 | makepasswd --crypt-md5 --clearfrom -`

### Using SSH key (without password)

Mount all public keys in the user's `.ssh/keys/` folder. All keys are automatically
appended to `.ssh/authorized_keys`.

```
docker run \
    -v /host/id_rsa.pub:/home/foo/.ssh/keys/id_rsa.pub:ro \
    -v /host/id_other.pub:/home/foo/.ssh/keys/id_other.pub:ro \
    -v /host/share:/home/foo/share \
    -p 2222:22 -d atmoz/sftp \
    foo::1001
```