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### Introduction ###
* 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.)
### Crypto primitives ###
* State-of-the-art crypto: ssh-ed25519, curve25519-sha256, chacha20-poly1305@openssh.com
* Older standard: <strike>ecdsa-sha2-nistp256, ecdh-sha2-nistp256, aes256-ctr, hmac-sha2-256</strike> removed in version 20190101
* Postquantum crypto: sntrup761x25519-sha512@openssh.com, chacha20-poly1305@openssh.com
### Project timelime ###
* <strike>experimental: 2014.01.01 - 2014.12.31 (experimentation)</strike>
* <strike>alpha(updated): 2015.01.01 - 2017.12.31 (not ready for production use, ready for testing)</strike>
* beta(updated): 2018.01.01 - ????.??.?? (ready for production use)
* stable: expected ????.??.?? - (ready for production use - including post-quantum crypto)
### Current release (20220801) ###
* has 62899 words of code
* beta release
### How-to run ###
~~~
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
tinysshd@.service:
[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
SuccessExitStatus=111
StandardInput=socket
StandardError=journal
[Install]
WantedBy=multi-user.target
~~~
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