1 How to use smartcards with OpenSSH?
3 OpenSSH contains experimental support for authentication using
4 Cyberflex smartcards and TODOS card readers, in addition to the cards
5 with PKCS#15 structure supported by OpenSC. To enable this you
10 (1) enable sectok support in OpenSSH:
12 $ ./configure --with-sectok
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) Optional: If you don't want to use a card passphrase, change the
50 acl on the private key file:
54 sectok> acl 0012 world: w
59 If you do this, anyone who has access to your card
60 can assume your identity. This is not recommended.
67 Sources and instructions are available from
68 http://www.opensc.org/
70 (2) enable OpenSC support in OpenSSH:
72 $ ./configure --with-opensc[=/path/to/opensc] [options]
74 (3) load a RSA key to the card:
81 (1) tell the ssh client to use the card reader:
85 (2) or tell the agent (don't forget to restart) to use the smartcard:
91 Tue Jul 17 23:54:51 CEST 2001
93 $OpenBSD: README.smartcard,v 1.9 2003/11/21 11:57:02 djm Exp $