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Old 07-26-2006, 12:19 PM   #1
Registered: Sep 2002
Posts: 184

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passwordless SSH works for root but not www-data

Hi, I set up a passwordsless ssh between 2 computers (with an rsa key). But when I "ssh -i id_rsa optimus@" as www-data it asks me for the passphrase and doesn't work. When I do the same as root it works just fine.
I have check the permissions on the id_rsa file and www-data can use it.
I've tried evreything and haven't made any progress.

Any help is very much appreciated!


Old 07-26-2006, 12:31 PM   #2
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Registered: Nov 2004
Distribution: Debian, Ubuntu, LinuxMint, Slackware, SysrescueCD, Raspbian, Arch
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Check your directory permissions. Your .ssh directory (under your HOME) should be mode 700. The files under that .ssh directory should be mode 600. Technically, as long as they are not writeable by non-owner you are OK. But I keep mine all tightened down to 700/600 personally.

Don't forget your HOME directory itself. It cannot be world-writeable! Many people get tripped up on this one. The loosest your want to go on your HOME directory permissions are 755.

SSH checks if these permissions are too loose, and if they are, pubkey authentication will not work. It is silently disallowed by sshd.

You probably don't want to allow root to directly ssh into your box, BTW. This is considered a security risk. Deny root in your sshd_config file, and if you need root access, ssh in as a normal user and then use su or sudo to go to root.

For troubleshooting ssh in general, on the client end run "ssh -vv username@computername" when you attempt to login. This gives you very verbose output of what is going on.


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