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Top Forums Shell Programming and Scripting Confirming validity of programming language tools Post 302974977 by SkySmart on Monday 6th of June 2016 10:25:41 PM
Old 06-06-2016
Confirming validity of programming language tools

so i have scripts that get run in ways similar to this:

Code:
cat script.pl | perl - $1 $2 $3

cat script.rb | ruby - $1 $ 2 $3

my question is, how can i verify that that the "perl" or "ruby" or "python" tool being run on the box is actually a legit tool? meaning, someone may move the tool from where it is originally supposed to be i.e. /usr/bin and may move it somewhere else. and then put a counterfeit version back in its place in /usr/bin.

is there any testing i can do on the tools themselves that will confirm yes, this tool is valid and is not something unusual?

my first thought was to use the file command...like this:

Code:
fie /usr/bin/python
file /usr/bin/perl

but im afraid there may be ways to fool this or tinker around with this to give inaccurate information masquerading as true.

any ideas?
 

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GZEXE(1)						      General Commands Manual							  GZEXE(1)

NAME
gzexe - compress executable files in place SYNOPSIS
gzexe [ name ... ] DESCRIPTION
The gzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a penalty in performance). For example if you execute ``gzexe /bin/cat'' it will create the following two files: -r-xr-xr-x 1 root bin 9644 Feb 11 11:16 /bin/cat -r-xr-xr-x 1 bin bin 24576 Nov 23 13:21 /bin/cat~ /bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file. You can remove /bin/cat~ once you are sure that /bin/cat works properly. This utility is most useful on systems with very small disks. OPTIONS
-d Decompress the given executables instead of compressing them. SEE ALSO
gzip(1), gznew(1), gzmore(1), gzcmp(1), gzforce(1) CAVEATS
The compressed executable is a shell script. This may create some security holes. In particular, the compressed executable relies on the PATH environment variable to find gzip and some other utilities (tail, chmod, ln, sleep). BUGS
gzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually in some cases, using chmod or chown. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWgzip | +--------------------+-----------------+ |Interface Stability | Committed | +--------------------+-----------------+ NOTES
Source for gzip is available on http://opensolaris.org. GZEXE(1)
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