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n00b
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Joined: 03 Nov 2007
Posts: 10

PostPosted: Sat Nov 15, 2008 9:49 pm    Post subject: Unable to "su" Reply with quote

Hey!
Everytime I try to run "su" as the normal user (user added to wheel) I get Authentication error.
Ok, so. I just misstyped I thought. So I changed my sshd config to enable root login.
Typed the password in a textdocument, copied it and pasted it when promted for the password for root, worked like a charm.
So I opened up another ssh session and logged in with the normal user, typed su and pasted the very same password and got Authentication failed.

I think it has something to do with filepermissions since I had to reformat the drive cause I ran out of inodes. To save some work I "dd:d" the drive to another drive, formatted the first drive and then copied (with cp -r * @ /) back to the first, newly formatted drive.
Hence root created all files and got ownership.
But what files could have the wrong permissions? the su-binary looks like this:
Code:
-rwx--x--x  1 root root  26772 Nov 15 18:46 su


My /etc/group wheel-line looks like this:
wheel::10:root,[my username]

Ofc its the actual username instead of brackets and stuff, I'm just abit paranoid;)

Any ideas where the problem can be?
Thx in advanced
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dmpogo
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Joined: 02 Sep 2004
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PostPosted: Sat Nov 15, 2008 10:14 pm    Post subject: Reply with quote

On a side note, next time use 'cp -pr'
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spindle
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Joined: 01 Dec 2003
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PostPosted: Sat Nov 15, 2008 10:31 pm    Post subject: Reply with quote

The su binary needs the suid bit on, like this,
Code:
$ ls -l `which su`
-rws--x--x 1 root root 30868 2008-02-26 10:09 /bin/su


You can try setting this bit or maybe just re-emerging shadow to make sure nothing else is weird with su,
Code:
# emerge -av1 shadow


I concur with dmpogo. You should have gone with 'cp -rp' or rather 'cp -a'. You probably have a bunch of other files with permissions messed up now.
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timeBandit
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Joined: 31 Dec 2004
Posts: 2671
Location: here, there or in transit

PostPosted: Sat Nov 15, 2008 11:18 pm    Post subject: Reply with quote

I'm sure this exact problem has been addressed before but I can't find it, so I'll spare this from eviction to Duplicate Threads. :|

Although the cause differs, this thread discusses a situation with the same end result: damaged file permissions and/or ownership. Your system is subtly broken. You may see odd misbehavior from time to time until you completely rebuild it as discussed in the referenced thread.
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notHerbert
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Joined: 11 Mar 2008
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PostPosted: Sat Nov 15, 2008 11:46 pm    Post subject: Reply with quote

It's in the Installing Gentoo Stickies https://forums.gentoo.org/viewtopic-t-11126.html :P
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timeBandit
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PostPosted: Sun Nov 16, 2008 2:55 am    Post subject: Reply with quote

I remembered the sticky but I was thinking specifically of the cause (copy w/o preserving permission)--I could swear I saw it discussed.... No matter, this is close enough. Thanks notHerbert.

Moved from Networking & Security to Duplicate Threads. See Why can't I su to root?, especially Q1.2.
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