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Full Discussion: home directory
Top Forums Shell Programming and Scripting home directory Post 302307916 by quirkasaurus on Thursday 16th of April 2009 03:44:17 PM
Old 04-16-2009
My preferred method of dealing with things like this is to do in 2 or 3 steps,
not all at once.

Here's the first script:

Code:
#!/bin/ksh

#----------------------------------------------------------------------#
# head to home partition.                                              #
#----------------------------------------------------------------------#
cd /home

/bin/ls |
while read dir ; do

#----------------------------------------------------------------------#
# Not a directory, next....                                            #
#----------------------------------------------------------------------#
  if [ ! -d $dir ]; then
    continue
  fi

  cd $dir

#----------------------------------------------------------------------#
# Untar the tar file....                                               #
#----------------------------------------------------------------------#
  cp /fullpath/tar_file.gz .
  gunzip tar_file.gz

  chmod -R *

  cd /home

done | tee /tmp/log1

Once that thing is debugged and working correctly,
I use a code generator to create the next dangerous type commands:
( mv commands in this case.... )

Code:
#!/bin/ksh

#----------------------------------------------------------------------#
# head to home partition.                                              #
#----------------------------------------------------------------------#
cd /home

/bin/ls |
while read dir ; do

  cd /home/$dir/public_html/test1

#----------------------------------------------------------------------#
# Randomly rename 6 files.                                             #
#----------------------------------------------------------------------#
  num=0
  /bin/ls *.txt |
  while read file_nm ; do

    (( check = $RANDOM % 2 ))

    if [ $check -eq 0 ]; then
      continue
    fi

    (( num = num + 1 ))

    echo /bin/mv $PWD/$file_nm $PWD/newword${num}.word

    if [ $num -ge 6 ]; then
      break
    fi
  done ### while doing random renaming....

  cd /home

done |
  tee /tmp/log2

Then, before executing, I examine the contents of /tmp/log2.
If the commands in there look right --- then I execute that script with:

Code:
/bin/ksh -xvf /tmp/log2 2>&1 | tee /tmp/log3

Using this method decreases the risk incurred at each step and
provides a log for each step also.

HTH
 

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LEARN ABOUT FREEBSD

smrsh

SMRSH(8)						      System Manager's Manual							  SMRSH(8)

NAME

       smrsh - restricted shell for sendmail

SYNOPSIS

       smrsh -c command

DESCRIPTION

       The smrsh program is intended as a replacement for sh for use in the ``prog'' mailer in sendmail(8) configuration files.  It sharply limits
       the commands that can be run using the ``|program'' syntax of sendmail in order to improve the over all security of your system.   Briefly,
       even  if  a  ``bad guy'' can get sendmail to run a program without going through an alias or forward file, smrsh limits the set of programs
       that he or she can execute.

       Briefly, smrsh limits programs to be in a single directory, by default /usr/libexec/sm.bin, allowing the system administrator to choose the
       set  of	acceptable  commands,  and  to the shell builtin commands ``exec'', ``exit'', and ``echo''.  It also rejects any commands with the
       characters ``', `<', `>', `;', `$', `(', `)', `
' (carriage return), or `
' (newline) on the command line to prevent ``end run'' attacks.
       It allows ``||'' and ``&&'' to enable commands like: ``"|exec /usr/local/bin/filter || exit 75"''

       Initial	pathnames  on programs are stripped, so forwarding to ``/usr/bin/vacation'', ``/home/server/mydir/bin/vacation'', and ``vacation''
       all actually forward to ``/usr/libexec/sm.bin/vacation''.

       System administrators should be conservative about populating the sm.bin directory.  For example, a reasonable  additions  is  vacation(1),
       and  the  like.	No matter how brow-beaten you may be, never include any shell or shell-like program (such as perl(1)) in the sm.bin direc-
       tory.  Note that this does not restrict the use of shell or perl scripts in the sm.bin directory (using the ``#!'' syntax); it simply  dis-
       allows  execution  of  arbitrary  programs.   Also,  including mail filtering programs such as procmail(1) is a very bad idea.  procmail(1)
       allows users to run arbitrary programs in their procmailrc(5).

COMPILATION

       Compilation should be trivial on most systems.  You may need to use -DSMRSH_PATH="path" to adjust the default search  path  (defaults	to
       ``/bin:/usr/bin'') and/or -DSMRSH_CMDDIR="dir" to change the default program directory (defaults to ``/usr/libexec/sm.bin'').

FILES

       /usr/adm/sm.bin - default directory for restricted programs on most OSs

       /var/adm/sm.bin - directory for restricted programs on HP UX and Solaris

       /usr/libexec/sm.bin - directory for restricted programs on FreeBSD (>= 3.3) and DragonFly BSD

SEE ALSO

       sendmail(8)

							   $Date: 2013-11-22 20:52:00 $ 						  SMRSH(8)
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