| | 1 | How to use smartcards with OpenSSH? |
| | 2 | |
| | 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 |
| | 6 | need to: |
| | 7 | |
| | 8 | Using libsectok: |
| | 9 | |
| | 10 | (1) enable sectok support in OpenSSH: |
| | 11 | |
| | 12 | $ ./configure --with-sectok |
| | 13 | |
| | 14 | (2) If you have used a previous version of ssh with your card, you |
| | 15 | must remove the old applet and keys. |
| | 16 | |
| | 17 | $ sectok |
| | 18 | sectok> login -d |
| | 19 | sectok> junload Ssh.bin |
| | 20 | sectok> delete 0012 |
| | 21 | sectok> delete sh |
| | 22 | sectok> quit |
| | 23 | |
| | 24 | (3) load the Java Cardlet to the Cyberflex card and set card passphrase: |
| | 25 | |
| | 26 | $ sectok |
| | 27 | sectok> login -d |
| | 28 | sectok> jload /usr/libdata/ssh/Ssh.bin |
| | 29 | sectok> setpass |
| | 30 | Enter new AUT0 passphrase: |
| | 31 | Re-enter passphrase: |
| | 32 | sectok> quit |
| | 33 | |
| | 34 | Do not forget the passphrase. There is no way to |
| | 35 | recover if you do. |
| | 36 | |
| | 37 | IMPORTANT WARNING: If you attempt to login with the |
| | 38 | wrong passphrase three times in a row, you will |
| | 39 | destroy your card. |
| | 40 | |
| | 41 | (4) load a RSA key to the card: |
| | 42 | |
| | 43 | $ ssh-keygen -f /path/to/rsakey -U 1 |
| | 44 | (where 1 is the reader number, you can also try 0) |
| | 45 | |
| | 46 | In spite of the name, this does not generate a key. |
| | 47 | It just loads an already existing key on to the card. |
| | 48 | |
| | 49 | (5) Optional: If you don't want to use a card passphrase, change the |
| | 50 | acl on the private key file: |
| | 51 | |
| | 52 | $ sectok |
| | 53 | sectok> login -d |
| | 54 | sectok> acl 0012 world: w |
| | 55 | world: w |
| | 56 | AUT0: w inval |
| | 57 | sectok> quit |
| | 58 | |
| | 59 | If you do this, anyone who has access to your card |
| | 60 | can assume your identity. This is not recommended. |
| | 61 | |
| | 62 | |
| | 63 | Using OpenSC: |
| | 64 | |
| | 65 | (1) install OpenSC: |
| | 66 | |
| | 67 | Sources and instructions are available from |
| | 68 | http://www.opensc.org/ |
| | 69 | |
| | 70 | (2) enable OpenSC support in OpenSSH: |
| | 71 | |
| | 72 | $ ./configure --with-opensc[=/path/to/opensc] [options] |
| | 73 | |
| | 74 | (3) load a RSA key to the card: |
| | 75 | |
| | 76 | Not supported yet. |
| | 77 | |
| | 78 | |
| | 79 | Common operations: |
| | 80 | |
| | 81 | (1) tell the ssh client to use the card reader: |
| | 82 | |
| | 83 | $ ssh -I 1 otherhost |
| | 84 | |
| | 85 | (2) or tell the agent (don't forget to restart) to use the smartcard: |
| | 86 | |
| | 87 | $ ssh-add -s 1 |
| | 88 | |
| | 89 | |
| | 90 | -markus, |
| | 91 | Tue Jul 17 23:54:51 CEST 2001 |
| | 92 | |
| | 93 | $OpenBSD: README.smartcard,v 1.9 2003/11/21 11:57:02 djm Exp $ |
andersk / openssh.git / blame_incremental