Unix access rights Post: 302108447

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Top Forums UNIX for Dummies Questions & Answers Unix access rights Post 302108447 by sb008 on Monday 26th of February 2007 05:40:17 PM

02-26-2007

Registered User

Quote:

Originally Posted by rudo

Hi,
Is it true that if I am not the root I can not select access permissions to a file that I own so that my friend (who also isn't the root) can access that file?

For files you own you can always change the access right. So the answer is no, this is not true.

Quote:

Originally Posted by rudo

And is it true that the only way to accomplish it is to ask the root to "put" my friend into "my" group? Then I could simply set the access rights to the file for members of my group, I think... That is why I am asking you...

If your friend doesn't belong to the same group as you do, you will have to set the access rights in such a way that "others" have access rights to your file.

If you do not want to set permission that wide, you indeed have to ask the system administrator to add your friend to the same group as you are in.

That way you don't need to allow access to "others" but can limit it to your "group".

Just setting the access rights correct for the file might even not be enough. You have to make sure that either "others" or the "group" have the correct access rights on all directories leading to the location of your file.

sb008

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LEARN ABOUT LINUX

pam_wheel

PAM_WHEEL(8)							 Linux-PAM Manual						      PAM_WHEEL(8)

NAME

       pam_wheel - Only permit root access to members of group wheel

SYNOPSIS

       pam_wheel.so [debug] [deny] [group=name] [root_only] [trust]

DESCRIPTION

       The pam_wheel PAM module is used to enforce the so-called wheel group. By default it permits root access to the system if the applicant
       user is a member of the wheel group. If no group with this name exist, the module is using the group with the group-ID 0.

OPTIONS

       debug
	   Print debug information.

       deny
	   Reverse the sense of the auth operation: if the user is trying to get UID 0 access and is a member of the wheel group (or the group of
	   the group option), deny access. Conversely, if the user is not in the group, return PAM_IGNORE (unless trust was also specified, in
	   which case we return PAM_SUCCESS).

       group=name
	   Instead of checking the wheel or GID 0 groups, use the name group to perform the authentication.

       root_only
	   The check for wheel membership is done only.

       trust
	   The pam_wheel module will return PAM_SUCCESS instead of PAM_IGNORE if the user is a member of the wheel group (thus with a little play
	   stacking the modules the wheel members may be able to su to root without being prompted for a passwd).

MODULE TYPES PROVIDED

       The auth and account module types are provided.

RETURN VALUES

       PAM_AUTH_ERR
	   Authentication failure.

       PAM_BUF_ERR
	   Memory buffer error.

       PAM_IGNORE
	   The return value should be ignored by PAM dispatch.

       PAM_PERM_DENY
	   Permission denied.

       PAM_SERVICE_ERR
	   Cannot determine the user name.

       PAM_SUCCESS
	   Success.

       PAM_USER_UNKNOWN
	   User not known.

EXAMPLES

       The root account gains access by default (rootok), only wheel members can become root (wheel) but Unix authenticate non-root applicants.

	   su	   auth     sufficient	   pam_rootok.so
	   su	   auth     required	   pam_wheel.so
	   su	   auth     required	   pam_unix.so

SEE ALSO

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

AUTHOR

       pam_wheel was written by Cristian Gafton <gafton@redhat.com>.

Linux-PAM Manual						    05/31/2011							      PAM_WHEEL(8)

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