test for directory being subdir of another directory Post: 302149026

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Top Forums Shell Programming and Scripting test for directory being subdir of another directory Post 302149026 by hackware on Tuesday 4th of December 2007 04:27:46 PM

12-04-2007

Banned

test for directory being subdir of another directory

I've been using the following code to make sure a shell script only runs under a "safe" directory.
Comments/Improvements?

Code:

#!/bin/sh
#----------------------------------------------------------------------------#
#...[top].[ subdir.sh ]......................................................#
#----------------------------------------------------------------------------#
#.........william.o.yates...hackware.at.tru2life.net...tru2life.info.........#
#----------------------------------------------------------------------------#
if [ X"${2}" = "X" ];
then
  echo -e "\a.\n..\n...\n...subdir.sh parent subdir\n...\n..\n.";
else
  dir=${1};
  dir_size=${#1};
  sub=${2};  # oops...    2, not 1...
  sub_size=${#2}; # oops...   2, not 1...
  #---------------------------------------------------------------------------
  # if sub_size is less than dir_size, it can't be under parent.
  #---------------------------------------------------------------------------
  if [ ${sub_size} -lt ${dir_size} ];
  then
    echo -e ".\n..\n...\n... sub_size -lt dir_size\n...\n..\.";
  fi
  #---------------------------------------------------------------------------
  # substring sub to dir_size to then compare sub and dir
  #---------------------------------------------------------------------------
  xdir="$(echo ${sub} | head -c ${dir_size})";
  if [ ${dir} = ${xdir} ];
  then
    echo -e ".\n..\n...\n... ${sub} IS a subdir of ${dir}\n...\n..\n.";
  else
    echo -e ".\n..\n...\n... ${sub} is NOT a subdir of ${dir}\n...\n..\n.";
  fi
fi
#----------------------------------------------------------------------------#
#...[end].[ subdir.sh ]......................................................#
#----------------------------------------------------------------------------#

Last edited by hackware; 12-04-2007 at 11:12 PM.. Reason: # oops... 2 not 1...

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chsh

CHSH(1) 							   User Commands							   CHSH(1)

NAME

       chsh - change login shell

SYNOPSIS

       chsh [options] [LOGIN]

DESCRIPTION

       The chsh command changes the user login shell. This determines the name of the user's initial login command. A normal user may only change
       the login shell for her own account; the superuser may change the login shell for any account.

OPTIONS

       The options which apply to the chsh command are:

       -h, --help
	   Display help message and exit.

       -R, --root CHROOT_DIR
	   Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory.

       -s, --shell SHELL
	   The name of the user's new login shell. Setting this field to blank causes the system to select the default login shell.

       If the -s option is not selected, chsh operates in an interactive fashion, prompting the user with the current login shell. Enter the new
       value to change the shell, or leave the line blank to use the current one. The current shell is displayed between a pair of [ ] marks.

NOTE

       The only restriction placed on the login shell is that the command name must be listed in /etc/shells, unless the invoker is the superuser,
       and then any value may be added. An account with a restricted login shell may not change her login shell. For this reason, placing /bin/rsh
       in /etc/shells is discouraged since accidentally changing to a restricted shell would prevent the user from ever changing her login shell
       back to its original value.

FILES

       /etc/passwd
	   User account information.

       /etc/shells
	   List of valid login shells.

       /etc/login.defs
	   Shadow password suite configuration.

SEE ALSO

       chfn(1), login.defs(5), passwd(5).

shadow-utils 4.5						    01/25/2018								   CHSH(1)