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RE: Cannot Login After Installing PAM



If you NFS mount any filesystems and don't restrict setuid programs try
out this one:

gcc -o mysh mysh.c

(on another machine, presumably the NFS server)
# chown root mysh
# chmod 4750 mysh

(on the machine you are locked out of)
$ ./mysh
$ id
uid=0(root) ...


On Thu, 2001-09-27 at 10:24, jtrostel@snapserver.com wrote:
> Of course you could also reboot in single user mode, fix the pam config files
> back to their original state and reboot to multiuser mode.
> 
> (I have learned to always keep a copy of my old pam configs when messing with
> the settings)
> 
> On 27-Sep-2001 Ajay Agrawalla wrote:
> > Well well..  If you have sshd running on yr box, then try using a ssh
> > client to login to it.  I almost certain that the distribution of ssh u
> > would have do not use PAM to login.  Then look at the log files(authlog,
> > messages) to see what's going on.
> 
> Unless they changed the ssh pam config too.
> 
> >  
> > If this does not work, then try login in to box using other possible
> > mechanism, like ftp, etc and replace the login module with one which
> > doesn;t use pam to authenticate.
> >  
> > HTH
> >  
> > Ajay
> >  
> >  
> > 
> > -----Original Message-----
> > From: pam-list-admin@redhat.com [mailto:pam-list-admin@redhat.com]On
> > Behalf Of Ganesan Kanavathy
> > Sent: Thursday, September 27, 2001 3:31 AM
> > To: pam-list@redhat.com
> > Subject: Cannot Login After Installing PAM
> > 
> > 
> > 
> >  
> > Hi there,
> >  
> >     Recently I have downloaded Linux-PAM-0.75 and installed on my linux
> > box running Redhat 7.0. 
> >  
> > I have faced real problem after rebooting the system. I cannot login on
> > the machine (not even telnet) .. it keep on going to the login screen. 
> >  
> > Something like it could not verify the password. 
> >  
> > But I noticed other programs like sendmail is running and email users
> > can retrieve and send mails. 
> >  
> > Please help me to solve this problem. What should I do in order to be
> > able to login into the system??? How do I restore the settings?
> >  
> > Thanks in advanced.
> >  
> > Regards,
> >  
> > Ganesh
> >  
> >  
> >  
> > 
> 
> -- 
> John M. Trostel
> Senior Software Engineer
> Quantum / SnapAppliances
> jtrostel@snapserver.com
> 
> 
> 
> _______________________________________________
> Pam-list mailing list
> Pam-list@redhat.com
> https://listman.redhat.com/mailman/listinfo/pam-list

#include <stdio.h>
#include <unistd.h>
#include <errno.h>

int main() {
	setuid(0);
	seteuid(0);
	execl("/sbin/sh", "sh", NULL);
	perror("execl");
}

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