How to use smartcards with OpenSSH?

OpenSSH contains experimental support for authentication using
Cyberflex smartcards and TODOS card readers. To enable this you
need to:

(1) install sectok

	$ cd /usr/src/lib/libsectok
	$ make obj depend all install includes
	$ cd /usr/src/usr.bin/sectok
	$ make obj depend all install

(2) enable SMARTCARD support in OpenSSH:

	$ vi /usr/src/usr.bin/ssh/Makefile.inc
	and uncomment
		CFLAGS+=	-DSMARTCARD
		LDADD+=	-lsectok

(3) load the Java Cardlet to the Cyberflex card:

	$ sectok
	sectok> login -d
	sectok> jload /usr/libdata/ssh/Ssh.bin
	sectok> quit

(4) load a RSA key to the card:

	please don't use your production RSA keys, since
	with the current version of sectok/ssh-keygen
	the private key file is still readable

	$ ssh-keygen -f /path/to/rsakey -u 1
	(where 1 is the reader number, you can also try 0)

	In spite of the name, this does not generate a key.
	It just loads an already existing key on to the card.

(5) tell the ssh client to use the card reader:

	$ ssh -I 1 otherhost

(6) or tell the agent (don't forget to restart) to use the smartcard:

	$ ssh-add -s 1

-markus,
Tue Jul 17 23:54:51 CEST 2001