Cant su to root


 
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Operating Systems Linux Cant su to root
# 8  
Old 02-12-2009
Code:
% type -a su                                                                                               81
su is /bin/su

ltrace has been installed. How should I run it?

Regards,
# 9  
Old 02-12-2009
Just

ltrace su

You'll get loads of output. I guess it might be useful to post that output.
# 10  
Old 02-13-2009
Thats really weird! Neither root (I guess it required root password) nor my normal user password are correct. Im sure I typed both of them correctly:

Code:
% ltrace su
Password:
--- SIGCHLD (Child exited) ---
su: incorrect password
+++ exited (status 1) +++

In the /var/log/messages file:

Code:
authentication failure

# 11  
Old 02-13-2009
Ack! that's what I get too. Silly su. I still suspect the problem is with PAM somehow. Please post the pam-su configuration file. If there are any lines with "include", post the correspdonding file also.
# 12  
Old 02-13-2009
You try it :

Code:
$ sudo passwd root

?

Last edited by rbatte1; 11-28-2016 at 11:27 AM..
# 13  
Old 02-14-2009
I thing bagmc means:

Have you tried?

Code:
$ sudo passwd root


Last edited by rbatte1; 11-28-2016 at 11:28 AM..
# 14  
Old 02-15-2009
Code:
% cat /etc/pam.d/su
#%PAM-1.0
auth       sufficient   /lib/security/$ISA/pam_rootok.so
# Uncomment the following line to implicitly trust users in the "wheel" group.
#auth       sufficient   /lib/security/$ISA/pam_wheel.so trust use_uid
# Uncomment the following line to require a user to be in the "wheel" group.
#auth       required     /lib/security/$ISA/pam_wheel.so use_uid
auth       required     /lib/security/$ISA/pam_stack.so service=system-auth
account    sufficient   /lib/security/$ISA/pam_succeed_if.so uid=0 use_uid quiet
account    required     /lib/security/$ISA/pam_stack.so service=system-auth
password   required     /lib/security/$ISA/pam_stack.so service=system-auth
# pam_selinux.so close must be first session rule
session    required     /lib/security/$ISA/pam_selinux.so close
session    required     /lib/security/$ISA/pam_stack.so service=system-auth
# pam_selinux.so open and pam_xauth must be last two session rules
session    required     /lib/security/$ISA/pam_selinux.so open
session    optional     /lib/security/$ISA/pam_xauth.so

Are you suggesting me to change root password? I do know root's password, I just wanna su from normal user to root. Btw, Im not in the sudoer file, I can edit that file, though.

Regards,
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