Special group & user privileges Post: 302467262

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Top Forums Shell Programming and Scripting Special group & user privileges Post 302467262 by LibRid on Thursday 28th of October 2010 07:52:44 PM

10-28-2010

Registered User

Alright thank you Scrutinizer and agn.

I will list below the current script; however, I've encountered my last problem.

-I want to make the group BANNED, have no access to the files with .log extension
-I want to make the group WRITEABLE, have write access to the files with .log extension

How can I do that if a file can only be assigned to one group?
I've already assigned the group BANNED to the .log files already, so now i'm stuck with the WRITEABLE group and how I can also assign the group to .log files with BANNED group.

Here is my current script

Code:

  #Input of new users
echo "Please enter new username"
echo "User 1..."
read newUser1
echo "User 2..."
read newUser2
echo "User 3..."
read newUser3
echo "User 4..."
read newUser4
echo "User 5..."
read newUser5

#Input of new groups
echo "Please enter name of group one"
read group1
echo "Please enter name of group two"
read group2


#creates 2 groups
sudo groupadd $group1
sudo groupadd $group2

#creates first 3 users and adds them to group 1
echo "Assigning users: $newUser1, $newUser2, $newUser3, to group $group1"
sudo useradd -m -s /bin/bash -G $group1 $newUser1
sudo useradd -m -s /bin/bash -G $group1 $newUser2
sudo useradd -m -s /bin/bash -G $group1 $newUser3

#creates last 2 users and adds them to group 2
echo "Assigning users: $newUser4, $newUser5, to group $group2"
sudo useradd -m -s /bin/bash -G $group2 $newUser4
sudo useradd -m -s /bin/bash -G $group2 $newUser5

#creates an extra two groups for BANNED and WRITE-able users
sudo groupadd banned
sudo groupadd writeable

#applies group privileges
sudo chgrp $group1 *.dat
sudo chmod 774 *.dat
sudo chgrp $group2 config*
sudo chmod 774 config*
sudo usermod -G banned $newUser2
sudo usermod -G banned $newUser4
sudo chgrp banned *.log
sudo chmod 704 *.log
sudo usermod -G writeable $newUser3
sudo usermod -G writeable $newUser5 #hm, how can I add the group writeable to *.log, when group banned is already assigned? And how can I give them special permissions?



#applies user privileges
chown $newUser1 *.txt
chmod 771 *.txt

---------- Post updated at 07:52 PM ---------- Previous update was at 07:18 PM ----------

Oh! One way this could be done is just chmod the .log files. Where X= whatever

Code:

 chmod xx2

However this would be for everyone else, not just the other users or users in WRITEABLE group.

LibRid

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setresuid

setresuid(2)							System Calls Manual						      setresuid(2)

NAME

       setresuid, setresgid - set real, effective, and saved user and group IDs

SYNOPSIS

DESCRIPTION

       sets the real, effective and/or saved user ID of the calling process.

       If  the	current  real,	effective  or saved user ID is equal to that of a user having appropriate privileges, sets the real, effective and
       saved user IDs to ruid, euid, and suid, respectively.  Otherwise, only sets the real, effective, and saved user IDs if ruid, euid, and suid
       each match at least one of the current real, effective, or saved user IDs.

       If ruid, euid, or suid is leaves the current real, effective or saved user ID unchanged.

       sets the real, effective and/or saved group ID of the calling process.

       If  the	current  real,	effective or saved user ID is equal to that of a user having appropriate privileges, sets the real, effective, and
       saved group ID to rgid, egid, and sgid, respectively.  Otherwise, only sets the real, effective and saved group ID if rgid, egid, and  sgid
       each match at least one of the current real, effective or saved group ID.

       If rgid, egid, or sgid is leaves the current real, effective or saved group ID unchanged.

   Security Restrictions
       Some  or  all  of  the actions associated with this system call require the privilege (CHSUBJIDENT).  Processes owned by the superuser will
       have this privilege.  Processes owned by other users may have this privilege, depending on system configuration.

       See privileges(5) for more information about privileged access on systems that support fine-grained privileges.

RETURN VALUE

       Upon successful completion, and return 0; otherwise, they return -1 and set to indicate the error.

ERRORS

       and fail if any of the following conditions are encountered:

	      ruid,	     euid, or suid (rgid, egid, or sgid) is not a valid user (group) ID.

	      None of the conditions above are met.

AUTHOR

       and were developed by HP.

SEE ALSO

       exec(2), getuid(2), setuid(2), privileges(5).

																      setresuid(2)