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Old 16th April 2012, 09:17 PM
Posts: n/a
Re: su -incorrect password

To verify you have the correct passwd etc - try to login as root in a virtual terminal
<ctrl+alt+f2> to get there
<ctrl+alt+f1> to get back.

If that passwd is OK for rot login there, then it SHOULD be OK for 'su'.

Your pam.d/su file looks UP but we should also see the /etc/pam.d/system-auth
We are interested in the 'auth' entries. so your su file like ....
auth sufficient pam_rootok.so
# ...
auth include system-auth
Just says that root succeeds (pam_rootok) w/o as passwd. Everyone else has to pass the '/etc/pam.d//system-auth' criteria.

look in /var/log/secure to see what when wrong with the pam authentication.
Some of the pam hurdles are base on uid number, whether you are in the 'wheel' group and more.
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Old 1st April 2014, 03:35 PM
MarceLinux Offline
Registered User
Join Date: Feb 2005
Posts: 3
Re: su -incorrect password

I have the same problem, using Fedora 17, with # su or #su - root , return Incorrect Password.
If I do Ctl - Alt - F5 and login as root, pasword is accepted.
Also when I remote login via SSH, root password is accepted.
Following is the error as seen in /var/log/secure:

Apr 1 11:22:57 aquanta2 sshd[130921]: Accepted password for administrador from port 2048 ssh2
Apr 1 11:22:57 aquanta2 sshd[130921]: pam_unix(sshd:session): session opened for user administrador by (uid=0)
Apr 1 11:23:02 aquanta2 unix_chkpwd[130985]: check pass; user unknown
Apr 1 11:23:07 aquanta2 unix_chkpwd[130986]: check pass; user unknown
Apr 1 11:23:07 aquanta2 unix_chkpwd[130986]: password check failed for user (root)
Apr 1 11:23:07 aquanta2 su: pam_unix(su:auth): authentication failure; logname=administrador uid=1000 euid=1000 tty=pts/2 ruser=administrador rhost= user=root
Apr 1 11:23:07 aquanta2 su: pam_succeed_if(su:auth): requirement "uid >= 1000" not met by user "root"

Last edited by MarceLinux; 1st April 2014 at 04:19 PM.
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