- tinysshd is a minimalistic SSH server which implements only a subset of SSHv2 features.
- tinysshd supports only secure cryptography (minimum 128-bit security, protected against cache-timing attacks)
- tinysshd doesn't implement older crypto (such as RSA, DSA, HMAC-MD5, HMAC-SHA1, 3DES, RC4, ...)
- tinysshd doesn't implement unsafe features (such as password or hostbased authentication)
- tinysshd doesn't have features such: SSH1 protocol, compression, port forwarding, agent forwarding, X11 forwarding ...
- tinysshd doesn't use dynamic memory allocation (no allocation failures, etc.)
- State-of-the-art crypto: ssh-ed25519, curve25519-sha256, [email protected]
- Older standard:
ecdsa-sha2-nistp256, ecdh-sha2-nistp256, aes256-ctr, hmac-sha2-256removed in version 20190101 - Postquantum crypto: [email protected], [email protected]
experimental: 2014.01.01 - 2014.12.31 (experimentation)alpha(updated): 2015.01.01 - 2017.12.31 (not ready for production use, ready for testing)- beta(updated): 2018.01.01 - ????.??.?? (ready for production use)
- stable: expected ????.??.?? - (ready for production use - including post-quantum crypto)
- has 62633 words of code
- beta release
TCPSERVER
tcpserver -HRDl0 0.0.0.0 22 /usr/sbin/tinysshd -v /etc/tinyssh/sshkeydir &
BUSYBOX
busybox tcpsvd 0 22 tinysshd -v /etc/tinyssh/sshkeydir &
INETD
/etc/inetd.conf:
ssh stream tcp nowait root /usr/sbin/tinysshd tinysshd -l -v /etc/tinyssh/sshkeydir
SYSTEMD
tinysshd.socket:
[Unit]
Description=TinySSH server socket
ConditionPathExists=!/etc/tinyssh/disable_tinysshd
[Socket]
ListenStream=22
Accept=yes
[Install]
WantedBy=sockets.target
[email protected]:
[Unit]
Description=Tiny SSH server
After=network.target auditd.service
[Service]
ExecStartPre=-/usr/sbin/tinysshd-makekey -q /etc/tinyssh/sshkeydir
EnvironmentFile=-/etc/default/tinysshd
ExecStart=/usr/sbin/tinysshd ${TINYSSHDOPTS} -- /etc/tinyssh/sshkeydir
KillMode=process
StandardInput=socket
StandardError=journal
[Install]
WantedBy=multi-user.target
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