1 How to use smartcards with OpenSSH?
3 OpenSSH contains experimental support for authentication using
4 Cyberflex smartcards and TODOS card readers. To enable this you
7 (1) enable SMARTCARD support in OpenSSH:
9 $ vi /usr/src/usr.bin/ssh/Makefile.inc
14 (2) If you have used a previous version of ssh with your card, you
15 must remove the old applet and keys.
19 sectok> junload Ssh.bin
24 (3) load the Java Cardlet to the Cyberflex card and set card passphrase:
28 sectok> jload /usr/libdata/ssh/Ssh.bin
30 Enter new AUT0 passphrase:
34 Do not forget the passphrase. There is no way to
37 IMPORTANT WARNING: If you attempt to login with the
38 wrong passphrase three times in a row, you will
41 (4) load a RSA key to the card:
43 $ ssh-keygen -f /path/to/rsakey -U 1
44 (where 1 is the reader number, you can also try 0)
46 In spite of the name, this does not generate a key.
47 It just loads an already existing key on to the card.
49 (5) tell the ssh client to use the card reader:
53 (6) or tell the agent (don't forget to restart) to use the smartcard:
57 (7) Optional: If you don't want to use a card passphrase, change the
58 acl on the private key file:
62 sectok> acl 0012 world: w
67 If you do this, anyone who has access to your card
68 can assume your identity. This is not recommended.
71 Tue Jul 17 23:54:51 CEST 2001
73 $OpenBSD: README.smartcard,v 1.9 2003/11/21 11:57:02 djm Exp $