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Full Discussion: users and groups /etc/group parsing
Top Forums Shell Programming and Scripting users and groups /etc/group parsing Post 302522120 by verdepollo on Friday 13th of May 2011 10:49:32 AM
Old 05-13-2011
Quote:
there is possible in sh to create a function who return a boolean value?
You can use true or false commands:

Code:
[root@atlas /]# true
[root@atlas /]# echo $?
0
[root@atlas /]# false
[root@atlas /]# echo $?
1
[root@atlas /]#

Or use your own function:

Code:
function f(){
exit 0
}

Quote:
2)i have to verify if an user belongs to a group and i think it is needed to create a function which take two parameter and return a boolean value. in fact i have to parse /etc/group file and try to find out if my user (user taken from param1) belongs to group (group taken from param2). Any ideas? Thanks
Maybe something like this?

Code:
[root@atlas /]# groups root | grep -q wheel
[root@atlas /]# echo $?
0
[root@atlas /]# groups root | grep -q asdf
[root@atlas /]# echo $?
1
[root@atlas /]#

 

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LEARN ABOUT DEBIAN

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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