Short:        SSH2 server and client suite with SFTP
Author:       Stefan Franke (BebboSSH), Michele Dipace (AROS port)
Uploader:     michele dipace kaffeine net (Michele Dipace)
Type:         comm/net
Version:      1.0.5
Replaces:     comm/net/bebbossh.x86_64-aros.lha
Requires:     AROS One x86_64 (ABIv11) with a TCP/IP stack (AROSTCP)
Architecture: i386-aros

WHAT IS THIS?

BebboSSH is an SSH2 implementation for Amiga systems by Stefan "Bebbo"
Franke. This archive is its port to
AROS x86_64 (AROS One 64-bit, ABIv11).
With it you can log in to an AROS machine from any SSH client, run
commands, and copy files with scp and sftp; the native clients connect
from AROS to other SSH servers. The original 68k version is
comm/net/bebbossh.lha;
the AROS i386 build is comm/net/bebbossh.i386-aros.lha,
the AROS aarch64 build is comm/net/bebbossh.aarch64-aros.lha.

PROGRAMS

  bebbosshd       SSH2 server: remote commands, SFTP, SCP, TCP port
                  forwarding (direct-tcpip), password and public-key login
  bebbossh        SSH2 client, with -L local port forwarding
  bebboscp        SCP client
  bebbosshkeygen  Ed25519 key generator

Algorithms: curve25519-sha256 key exchange, ssh-ed25519 host and user
keys, aes128-gcm@openssh.com and chacha20-poly1305@openssh.com ciphers.
AES-GCM uses AES-NI and PCLMULQDQ when the CPU provides them.

REQUIREMENTS

- AROS One x86_64 (ABIv11).
- A configured TCP/IP stack (AROSTCP, bsdsocket.library).
- No extra libraries: the crypto code is linked into each program.
- In a virtual machine, use an rtl8139 or pcnet network card, not
  e1000 (see KNOWN LIMITS).

CONTENTS

  BebboSSH/bebbosshd, bebbossh, bebboscp, bebbosshkeygen
  BebboSSH/sshd_config.example, passwd.example
  BebboSSH/README.AROS.txt   install and configuration guide
  BebboSSH/README.md, AROS_PORTING.md, docs/, scripts/
  BebboSSH/COPYING, LICENSE  license texts (GNU GPL v3)
  BebboSSH/SHA256SUMS        checksums of the files above

INSTALLATION

1. Extract the archive to a persistent volume, for example DH0:.
2. In an AROS Shell, create the configuration and a host key:

     cd DH0:BebboSSH
     copy sshd_config.example sshd_config
     copy passwd.example passwd
     bebbosshkeygen -f ssh_host_ed25519_key

3. Edit passwd: one "username password" pair per line. The test/test
   entry of the example is for a first test only; replace it.
4. Start the server:

     stack 262144
     bebbosshd

5. From another machine: ssh username@<address of the AROS machine>

To start the server at boot, add these lines to S:User-Startup:

  Stack 262144
  If EXISTS DH0:BebboSSH/bebbosshd
      Run DH0:BebboSSH/bebbosshd
  EndIf

To call the clients from anywhere, copy bebbossh, bebboscp and
bebbosshkeygen to C:. Keep bebbosshd in its own directory: the example
configuration finds its files through PROGDIR:.

CONFIGURATION

bebbosshd reads ENVARC:ssh/sshd_config if it exists, otherwise
PROGDIR:sshd_config. The main directives of the example:

  Port 22                 TCP port
  ListenAddress 0.0.0.0   address to listen on (0.0.0.0 = all)
  HostKey PROGDIR:ssh_host_ed25519_key
  Passwords PROGDIR:passwd
  HomeDir DH0:            start directory of commands and SFTP
                          (on x86_64 only with BEBBOSSH_AROS_X64_CD set)
  Stack 262144            stack of command tasks (default 1 MiB)
  DebugLevel 1            log level: 0 none to 8 ultra, or a name such
                          as error or debug
  SendNoop some           keepalive messages to idle sessions
  Ciphers aes128-gcm@openssh.com,chacha20-poly1305@openssh.com
                          ciphers offered (both by default)

Command-line options override the file: -p port, -A password file,
-K host key, -H home directory, -v log level (for example -v5).
Public-key login reads ENVARC:.ssh/authorized_keys (OpenSSH format,
one key per line). README.AROS.txt describes every file in detail.

USAGE

From a PC with OpenSSH:

  ssh user@aros-host version
  scp file.txt user@aros-host:DH0:
  sftp user@aros-host

From AROS:

  bebbossh user@host
  bebbossh -i DH0:keys/id_ed25519 user@host command
  bebbossh -L 8080:localhost:80 user@host
  bebboscp localfile user@host:remotefile
  bebbosshkeygen -f DH0:keys/id_ed25519

The first connection to a host asks whether to trust its key: answer
yes. The key is then kept in ENVARC:.ssh/known_hosts.

KNOWN LIMITS

- No full interactive PTY programs: the interactive shell runs simple
  commands, and programs that read their input are rejected with exit
  status 2.
- No redirection or pipes (>, <, |) in remote commands.
- Remote commands run one at a time and block the server until they
  end, also when typed in an interactive session, and Ctrl-C does not
  stop them: keep them short.
- An SFTP path on a volume that is not mounted opens an "insert
  volume" requester and blocks the server until it is closed.
- With an Intel e1000 network card and heavy network load, AROS One
  x86_64 can halt or reboot. The cause is the AROS e1000.device; it is
  fixed upstream (deadwood2/AROS issue 274). Until AROS One ships the
  fix, use an rtl8139 or pcnet card.
- Some features are off unless set before starting bebbosshd
  (setenv NAME 1): BEBBOSSH_AROS_X64_CD (cd and pwd in the interactive
  shell), BEBBOSSH_AROS_X64_SFTP_MTIME (keep upload times),
  BEBBOSSH_AROS_X64_SFTP_LINKS (SFTP readlink and symlink).
- OpenSSH "put -p" sets the file time before it closes the file, and
  AROS updates the date on close, so that time is not kept.
- passwd.example contains a test password: change it.

WHAT IS NEW IN 1.0.5

- The clients wait for the answer to the host key question. Before,
  they read the command line that AROS leaves in the input buffer as
  the answer and stopped with "failed to verify the host".
- In the server's interactive shell, Shift+Left no longer prints
  [1;2D on an AROS console, and a key typed right after a cursor key
  in the same packet (fast typing, pasted text) is no longer lost.
- The native client is tested on the AROS One console: cursor keys
  with Shift and Ctrl, Ctrl-C at the password prompt, USER as the
  default login name.
- A new build for AROS on the Raspberry Pi (aarch64):
  comm/net/bebbossh.aarch64-aros.lha.

TESTED

On AROS One x86_64 under QEMU with an rtl8139 card, with the programs
of this archive: OpenSSH ssh, scp and sftp; 100 logins in a row; 80
file transfers without pauses; two servers at once; Ctrl-C and
restart; a connection dropped during an interactive command; TAB
completion; the native clients, also on the AROS console; with and
without AES-NI.

SOURCE AND LICENSE

GNU GPL v3 or later (see COPYING). Source of this release:
  https://github.com/kaffeine1/bebbossh-aros/tree/v1.0.5-aros-x86_64
Original BebboSSH: https://franke.ms/git/bebbo/bebbossh
Bug reports: https://github.com/kaffeine1/bebbossh-aros/issues

Port by Michele Dipace <michele.dipace@kaffeine.net>.