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Script check if ssh requires a password???

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# 1  
Old 02-20-2009
Script check if ssh requires a password???
Thanks to the help from this forum i've learned a lot of good stuff but I still have questions Smilie.
I need to write a script that checks if ssh to a box requires a password. I need it will be an "if" statement, if ssh requires password, then do a key exchange(with i already have). Just need to check if it needs password for ssh. Thanks
# 2  
Old 02-23-2009
Thanks for the kind words.

Please post the script you have written (and don't forget to use code tags).
# 3  
Old 02-23-2009
I have a list of IPs I need to SSH in located in a file called ~/DesktopIPList. When I run this and I don't have a key exchange with a host on the IP list It hangs the script for a few seconds because it can't SSH in.

Code:
remoteuser="root"
for remotehost in `cat ~/Desktop/IPList`
do

### Getting remote hostname ## Just an example command
ssh -q "$remoteuser@$remotehost" hostname

done

The ONLY question is, How can I determine if a host has passwordless SSH access or it requires a password in a script.
# 4  
Old 02-24-2009
I'm not sure if the question is not clear or it's just not possible. Can anyones help? Thanks
# 5  
Old 03-06-2009
I've run into the same problem recently. While I seem to vaguely recall something more useful (along the lines of a --query option for ssh or scp), this should work too.

The option password authentication can be turned off, then you can just mangle the results to fit your need.

Code:
# ssh user@[unauthed_host] -o PasswordAuthentication=no
Permission denied (publickey,password).
# echo $?
255

# ssh user@[unauthed_host] -qo PasswordAuthentication=no echo 0 || echo 1
1
# ssh user@[authed_host]   -qo PasswordAuthentication=no echo 0 || echo 1
0

# 6  
Old 03-06-2009
Thanks for following up... but I when I run that command it still request for a password. Is there any other way I can check if I can do passwordless ssh?
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