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Cocker68
Apprentice
Joined: 16 Jan 2003
Posts: 227
Location: Germany
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 Posted: Sat Oct 29, 2005 5:26 pm Post subject: [solved] ssh without asking for password? |
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How can I get ssh not to ask for a password, but to exit with a return code !=0, when passwordfree authentication is not possible?
I want to test in a script, if passwordfree ssh is possible, before proceeding with other actions:
| Code: | ssh remote.host true
if [ $? -eq 0 ]; then
echo "passwordfree ssh to remote.host is possible"
else
echo "passwordfree ssh to remote.host is not possible"
fi |
I also tried the -q and -qq options, but to no avail. ssh keeps asking for a password, and my script hangs forever.
The next question is, how to avoid the prompt "Are you sure you want to continue connecting (yes/no)?" when remote.host is not listed in Your known_hosts-file.
How can I use ssh in a script-safe way?
- Cocker :wq
Last edited by Cocker68 on Sun Oct 30, 2005 10:48 am; edited 1 time in total |
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bonbons
Apprentice
Joined: 04 Sep 2004
Posts: 250
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| Posted: Sat Oct 29, 2005 7:59 pm Post subject: |
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| Does calling ssh with stdin redirected to /dev/null help? |
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lbrtuk
l33t
Joined: 08 May 2003
Posts: 910
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| Posted: Sun Oct 30, 2005 2:16 am Post subject: |
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In your ~/.ssh/ssh_config, set PasswordAuthentication to no.
Then I think it should just fail.
man ssh_config for more related settings, like PreferredAuthentications. |
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Cocker68
Apprentice
Joined: 16 Jan 2003
Posts: 227
Location: Germany
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| Posted: Sun Oct 30, 2005 10:47 am Post subject: |
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| bonbons wrote: | | Does calling ssh with stdin redirected to /dev/null help? |
You mean ssh -n remote.host? Sorry, that didn't help.
| lbrtuk wrote: | | In your ~/.ssh/ssh_config, set PasswordAuthentication to no |
This is not quite correct, but pointed me to the right direction. Thank You both.
Actually I had to put into $HOME/.ssh/config:
| Code: | Host *.domain1.local *.domain2.local remote.host
BatchMode yes
StrictHostKeyChecking no |
This provides, what I want...
| Code: | # ssh remote.host
Permission denied (publickey,keyboard-interactive).
# echo $?
255 |
... in those cases:
- The authenticity of host 'remote.host (192.168.240.1)' can't be established
- my public key is not listed in remote.host's authorized_keys-file
When I want this behaviour only in particular cases, I can specify the configuration file together with invocation of ssh. This keeps usual behaviour of ssh, like it is.
| Code: | | # ssh -F ssh_config.backup remote.host |
- Cocker :wq |
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