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Jan 1, 2015

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

Project timelime

  • 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)

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

TravisCI status