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Full Discussion: Remotely unlock ssh key (Gnome, Debian Lenny)
Operating Systems Linux Debian Remotely unlock ssh key (Gnome, Debian Lenny) Post 302410240 by harald on Monday 5th of April 2010 11:31:48 AM
Old 04-05-2010
Hi pludi,

thanks for your reply, and here's a more detailed description of my setup on the office system:

1. Relevant (uncommented) lines from /etc/ssh/ssh_config:

Code:
Host *
    SendEnv LANG LC_*
    HashKnownHosts yes
    GSSAPIDelegateCredentials no

2. X11-Forwarding is enabled in ~/.ssh/config:

Code:
Host *
   ForwardX11 yes
   User root

3. Directory listing of ~/.ssh/, where the keys are located:

Code:
hhuseman@bofh:~/.ssh$ ls
config       id_dsa.keystore  id_dsa.pub.bofh  id_rsa.bofh      id_rsa.pub       known_hosts
id_dsa       id_dsa.old       id_dsa.pub.old   id_rsa.keystore  id_rsa.pub.bofh  known_hosts.old
id_dsa.bofh  id_dsa.pub       id_rsa           id_rsa.old       id_rsa.pub.old
hhuseman@bofh:~/.ssh$

4. and finally, here's a trace of a try to establish the connection from the office system:

Code:
hhuseman@bofh:~/.ssh$ ssh -v hhuseman@frodo
OpenSSH_4.7p1 Debian-2, OpenSSL 0.9.8g 19 Oct 2007
debug1: Reading configuration data /home/hhuseman/.ssh/config
debug1: Applying options for frodo
debug1: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to frodo.dh9dat.de [85.214.78.129] port 22.
debug1: Connection established.
debug1: identity file /home/hhuseman/.ssh/identity type -1
debug1: identity file /home/hhuseman/.ssh/id_rsa type 1
debug1: identity file /home/hhuseman/.ssh/id_dsa type 2
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.1p1 Debian-5
debug1: match: OpenSSH_5.1p1 Debian-5 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_4.7p1 Debian-2
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host 'frodo.dh9dat.de' is known and matches the RSA host key.
debug1: Found key in /home/hhuseman/.ssh/known_hosts:1322
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /home/hhuseman/.ssh/identity
debug1: Offering public key: /home/hhuseman/.ssh/id_rsa
debug1: Authentications that can continue: publickey
debug1: Offering public key: /home/hhuseman/.ssh/id_dsa
debug1: Server accepts key: pkalg ssh-dss blen 434
debug1: PEM_read_PrivateKey failed
debug1: read PEM private key done: type <unknown>
Enter passphrase for key '/home/hhuseman/.ssh/id_dsa':
debug1: read PEM private key done: type <unknown>
Enter passphrase for key '/home/hhuseman/.ssh/id_dsa': 
debug1: PEM_read_PrivateKey failed
debug1: read PEM private key done: type <unknown>
Enter passphrase for key '/home/hhuseman/.ssh/id_dsa':

(The system is first trying the RSA-key which is blacklisted on the target server 'cause is vulnerable - but I'm still using it on some internal systems, so I can't remove it. And, it should be harmless AFAIK, as the "right" DSA-key is tried afterwards).

I hope these informations help to bring some more light into the dark,

thanks,

Harald
 

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