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Full Discussion: Issues with umask
Top Forums UNIX for Advanced & Expert Users Issues with umask Post 9079 by Kelam_Magnus on Monday 22nd of October 2001 04:39:49 PM
Old 10-22-2001
umask problems
neerajchallana,

Couple of questions. My answer is from the point of view of HPUX OS.

What OS version do you have?
Are you trying to do this remotely?

Perform these commands and see what you get.

umask
umask -S
remsh systemname umask
remsh systemname umask -S

Check your /etc/profile. It is the default profile for users if they don't have a .profile in their home directory.

Also, check in each affected user's home directory .profile. Do "grep umask .profile" in the user's home dir. If you get nothing then you will need to modify their .profile and add a line like this:

umask 002
:wq!

I have recently found out that if you execute remsh with your system name and umask, you get the DEFAULT for the system type you have regardless of the umask that you set when files are created. This is a security measure built into the OS, at least for HPUX.

On "trusted" systems, the default umask for remote access is 066.

On an non-trusted system, the default umask is 000.

Also, another little tidbit. If you set your umask to some exe permissions, like umask 000. Touch a file and check the permissions on it. I guarantee you it will only be 666! Do it and find out.

# umask 000
# touch file1
# ls -l file1
-rw-rw-rw- file1


This maybe too much info, but I just had an issue with umask and remsh.
 

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LEARN ABOUT DEBIAN

pam_umask

PAM_UMASK(8)							 Linux-PAM Manual						      PAM_UMASK(8)

NAME

       pam_umask - PAM module to set the file mode creation mask

SYNOPSIS

       pam_umask.so [debug] [silent] [usergroups] [umask=mask]

DESCRIPTION

       pam_umask is a PAM module to set the file mode creation mask of the current environment. The umask affects the default permissions assigned
       to newly created files.

       The PAM module tries to get the umask value from the following places in the following order:

       o   umask= argument

       o   umask= entry of the users GECOS field

       o   pri= entry of the users GECOS field

       o   ulimit= entry of the users GECOS field

       o   UMASK= entry from /etc/default/login

       o   UMASK entry from /etc/login.defs

OPTIONS

       debug
	   Print debug information.

       silent
	   Don't print informative messages.

       usergroups
	   If the user is not root and the username is the same as primary group name, the umask group bits are set to be the same as owner bits
	   (examples: 022 -> 002, 077 -> 007).

       umask=mask
	   Sets the calling process's file mode creation mask (umask) to mask & 0777. The value is interpreted as Octal.

MODULE TYPES PROVIDED

       Only the session type is provided.

RETURN VALUES

       PAM_SUCCESS
	   The new umask was set successfully.

       PAM_SERVICE_ERR
	   No username was given.

       PAM_USER_UNKNOWN
	   User not known.

EXAMPLES

       Add the following line to /etc/pam.d/login to set the user specific umask at login:

		   session optional pam_umask.so umask=0022

SEE ALSO

       pam.conf(5), pam.d(5), pam(7)

AUTHOR

       pam_umask was written by Thorsten Kukuk <kukuk@thkukuk.de>.

Linux-PAM Manual						    06/04/2011							      PAM_UMASK(8)
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