11-25-2008
"Dynamic" Group Permissions?
Hi all,
Apologies if the answer is out there somewhere, I did have a search about.....
In my environment of a RHEL 4 machine and users all listed out in LDAP (say, userA in a deptZ primary group; userB in same deptZ primary group, plus deptY secondary group), I am trying to find a mechanism to provide permissions on files based on username AND user location.
Essentially through my software - which is essentially kicked off by a .sh file and this is where I am trying to put this logic - I want a userA session running in deptA to create a file with permissions:
.rw.r..... userA deptZ file1
A userB session can then read the file when physically in deptZ, but somehow his membership of deptZ is removed when he physically is not in that dept, ie he is down the corridor in deptY. My software startup .sh file for each session can flag which dept the user is in, so I am looking for someway in the script to turn this flag into granting/denying access to the file for each particular session.
Any ideas? Am I crazy?!
Thanks for looking,
Steve
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setsid(2) System Calls Manual setsid(2)
NAME
setsid - create session and set process group ID
SYNOPSIS
DESCRIPTION
If the calling process is not a process group leader, creates a new session. The calling process becomes the session leader of this new
session, it becomes the process group leader of a new process group, and it has no controlling terminal. The process group ID of the call-
ing process is set equal to the process ID of the calling process. The calling process is the only process in the new process group and
the only process in the new session.
Security Restrictions
Some or all of the actions associated with this system call may require privileges. See privileges(5) for more information.
RETURN VALUE
Upon successful completion, returns the value of the new process group ID of the calling process. Otherwise, it returns a value of and
sets to indicate the error.
ERRORS
If fails, no changes occur and (see errno(2)) is set to one of the following values:
The calling process is already a process group leader, or
the process group ID of a process other than the calling process matches the process ID of the calling process.
The calling process does not have sufficient privileges.
AUTHOR
was developed by HP and AT&T.
SEE ALSO
exec(2), exit(2), fork(2), getpid(2), kill(2), setpgid(2), setpgrp(2), setpgrp3(2), signal(2), privileges(5), termio(7).
STANDARDS CONFORMANCE
setsid(2)