Gzexe encrypts shell scripts 01

Gzexe encrypts shell scripts 01

Gzexe encrypts shell scripts 01

I. Introduction

Most of the time, our script involves some private information, such as the user name, password, or other important information. We use some encryption methods to block this information, ensure that the security of the system has the streamability of scripts. Generally, we only need to use the built-in gzexe tool.

II, Lab test started:

2.1 compile a script for testing [root @ woo ~] # Vi woo. sh #! /Bin/kshecho 'prudentwoo' ''' date + % Y-% m-% d' % t' uptime2. 2. Grant the executable permission and run [root @ woo ~] # Chmod + x woo. sh [root @ woo ~] #./Woo. shPrudentWoo 22:13:27 up 10 days, 22:13:27, 3 users, load average: 0.00, 0.01, 0.052.3 perform the gzexe encryption operation [root @ woo ~] # Gzexe woo. shwoo. sh: 11.5% [root @ woo ~] # Ll woo. s *-rwxr-xr-x 1 root 888 Dec 30 woo. sh-rwxr-xr-x 1 root 61 Dec 30 woo. sh ~ [Root @ woo ~] #2.4 encrypted file content [root @ woo ~] # Strings woo. sh #! /Bin/shskip = 44tab = ''nl = 'ifs = "$ tab $ nl" umask = 'umask 77 gztmpdir = trap 'res = $? Test-n "$ gztmpdir" & rm-fr "$ gztmpdir" (exit $ res ); exit $ res '0 1 2 3 5 10 13 15if type mktemp>/dev/null 2> & 1; then gztmpdir = 'mktemp-dt 'else gztmpdir =/tmp/gztmp $; mkdir $ gztmpdirfi |{( exit 127); exit 127 ;} gztmp = $ gztmpdir/$0 case $0 in-* | */* '') mkdir-p" $ gztmp "& rm-r" $ gztmp ";; */*) gztmp = $ gztmpdir/'basename "$0" '; esac ||{ (exit 127); exit 127 ;} case 'echo X | tail-n + 1 2>/dev/nul L 'tail') tail_n =-n; *) tail_n =; esacif tail $ tail_n + $ skip <"$0" | gzip-cd> "$ gztmp "; then umask $ umask chmod 700 "$ gztmp" (sleep 5; rm-fr "$ gztmpdir ") 2>/dev/null & "$ gztmp" ${1 + "$ @"}; res = $? Else echo> & 2 "Cannot decompress $0" (exit 127); res = deffi; exit $ reswoo. sh (* MIWWWPOHI, IU2.5 re-executes the encrypted file, and the output result is the same as [root @ woo ~] #./Woo. shPrudentWoo 22:17:22 up 10 days, 22:17:22, 3 users, load average: 0.00, 0.01, 0.05 [root @ woo ~] #2.6 perform the decryption operation: [root @ woo ~] # Gzexe-d woo. sh [root @ woo ~] # Cat woo. sh #! /Bin/kshecho 'prudentwoo' ''' date + % Y-% m-% d' % t' uptime [root @ woo ~] #2.7 confirm again that encryption and decryption are all feasible: [root @ woo ~] #./Woo. shPrudentWoo 22:19:50 up 10 days, 22:19:50, 3 users, load average: 0.00, 0.01, 0.05 [root @ woo ~] #