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Full Discussion: How to check if a file is not readable by anyone except the owner?
Top Forums Shell Programming and Scripting How to check if a file is not readable by anyone except the owner? Post 302417179 by bharath.gct on Wednesday 28th of April 2010 08:17:30 PM
Old 04-28-2010
How to check if a file is not readable by anyone except the owner?
All,

I have a script where I get a filename as input and do some processing with the file that I got as input.

Requirement:
Now I have a requirement where I need to check the following:

Quote:
1. Whether the file is created by the $USER (who is running this script) AND
2. The file has permissions set in such a way that only the $USER will have read permissions to that passed file AND
3. All others (group/world) should NOT have ANY permissions.
If either of this goes wrong, the script should pop out a warning message.

I tried searching the internet but did not get an answer. Any help is appreciated.

Below is the sample code:

Code:
#! /bin/ksh

echo "Enter the File : \c"
read filename

if [ -f $filename ]; then
  Check the owner AND Permissions of the file ----> Need to code this!!!
  if [ permissions are OK ]; then ----> i.e. permissions is as mentioned above
    do processing
  else
    echo "ERROR"
  fi
fi

 

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LEARN ABOUT SUNOS

check-permissions

check-permissions(1M)					  System Administration Commands				     check-permissions(1M)

NAME

       check-permissions - check permissions on mail rerouting files

SYNOPSIS

       /usr/sbin/check-permissions [login]

DESCRIPTION

       The   check-permissions script is intended as a migration aid for sendmail(1M). It checks the /etc/mail/sendmail.cf file for all configured
       alias files, and checks the alias files for :include: files. It also checks for certain .forward files. For each file  that   check-permis-
       sions checks, it verifies that none of the parent directories are group- or world-writable. If any directories are overly permissive, it is
       reported. Otherwise it reports that no unsafe directories were found.

       As to which .forward files are checked, it depends on the arguments included on the command line. If no	argument  is  given,  the  current
       user's home directory is checked for the presence of a  .forward file. If any arguments are given, they are assumed to be valid logins, and
       the home directory of each one is checked.

       If the special argument ALL is given,  the passwd entry in the  /etc/nsswitch.conf file is checked, and all password entries  that  can	be
       obtained through the switch file are checked. In large domains, this can be time-consuming.

OPERANDS

       The following operands are supported:

       login	       Where login is a valid user name, checks the home directory for	login.

       ALL	       Checks the home directory of  all users.

FILES

       /etc/mail/sendmail.cf   Defines enviornment for	sendmail

       /etc/mail/aliases       Ascii mail aliases file

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWsndmu 		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getent(1M), sendmail(1M), aliases(4), attributes(5)

SunOS 5.10							    10 Nov 2003 					     check-permissions(1M)
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