user creation problem Post: 9913

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Top Forums UNIX for Dummies Questions & Answers user creation problem Post 9913 by PxT on Monday 5th of November 2001 01:11:59 PM

Old

11-05-2001

Registered User

I'm not sure exactly what method useradd uses to lock the password file, but I would try the following:

Run a 'ps ax' to look for any hung useradd processes or any other process that may be modifying the password file. Close or kill them.
Run an 'ls -l /etc/passwd*' and look for a potential lock file. It may be called passwd~, passwd.lock, etc. Remove it (or move it to /tmp as a safety measure)
Run an 'ls -la /var/lock' to look for any lock files. Again, remove or move them.
If you are still unable to run your command, try 'strace useradd <arguments>'
This should show you the name of the lock file being accessed. You can then remove it.

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pam_group

PAM_GROUP(8)							 Linux-PAM Manual						      PAM_GROUP(8)

NAME

       pam_group - PAM module for group access

SYNOPSIS

       pam_group.so

DESCRIPTION

       The pam_group PAM module does not authenticate the user, but instead it grants group memberships (in the credential setting phase of the
       authentication module) to the user. Such memberships are based on the service they are applying for.

       By default rules for group memberships are taken from config file /etc/security/group.conf.

       This module's usefulness relies on the file-systems accessible to the user. The point being that once granted the membership of a group,
       the user may attempt to create a setgid binary with a restricted group ownership. Later, when the user is not given membership to this
       group, they can recover group membership with the precompiled binary. The reason that the file-systems that the user has access to are so
       significant, is the fact that when a system is mounted nosuid the user is unable to create or execute such a binary file. For this module
       to provide any level of security, all file-systems that the user has write access to should be mounted nosuid.

       The pam_group module functions in parallel with the /etc/group file. If the user is granted any groups based on the behavior of this
       module, they are granted in addition to those entries /etc/group (or equivalent).

OPTIONS

       This module does not recognise any options.

MODULE TYPES PROVIDED

       Only the auth module type is provided.

RETURN VALUES

       PAM_SUCCESS
	   group membership was granted.

       PAM_ABORT
	   Not all relevant data could be gotten.

       PAM_BUF_ERR
	   Memory buffer error.

       PAM_CRED_ERR
	   Group membership was not granted.

       PAM_IGNORE

	   pam_sm_authenticate was called which does nothing.

       PAM_USER_UNKNOWN
	   The user is not known to the system.

FILES

       /etc/security/group.conf
	   Default configuration file

SEE ALSO

       group.conf(5), pam.d(5), pam(8).

AUTHORS

       pam_group was written by Andrew G. Morgan <morgan@kernel.org>.

Linux-PAM Manual						    04/01/2010							      PAM_GROUP(8)