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Old 05-18-2014, 11:39 AM   #1
WasaProduction
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Executing bash in browser, apache2


Hi Everyone
What im trying to achieve is to deploy some data of the system in a browser, using bash scripts for example
Code:
#!/bin/bash
hostname
uname
uname -o
But all I get is the same thing in plain text, how can I modify that code in order to deploy what those commands should deploy?, y already have seen some things like
Code:
echo "Content type: text/html"
but I am not really sure how to use that
Thanks!
 
Old 05-18-2014, 12:59 PM   #2
shivaa
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Quote:
But all I get is the same thing in plain text, how can I modify that code in order to deploy what those commands should deploy?
Do you want to check, what those commands do in your script? If yes, just use debugging in your script i.e. just add set -vx below shebang and run the script again, as:
Code:
#!/bin/bash
set -vx
hostname
uname
uname -o
It will display the result of every command that is executing within the script, so you would be able to find what exactly those commands are doing.
 
Old 05-18-2014, 01:15 PM   #3
WasaProduction
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I do know what they do, but what Im trying to do here is to make them work in the browser by calling the script, but all that I can achieve is that the browser actually opens the script but only prints the commands not what they are supposed to do, for example the hostname displays "wasa" in the terminal, but when I run the script in the browser it prints "hostname".
Thanks.
 
Old 05-18-2014, 01:26 PM   #4
ndc85430
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The web server probably doesn't know how to run Bash scripts. I don't know if it's possible to do that with Apache, either. What you'll probably need to do is use something the server can deal with (e.g. PHP - see mod_php, I believe) to either run your script and provide the output, or to replace your script (if PHP, say, has functionality to replicate what you're doing with Bash).
 
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Old 05-18-2014, 01:27 PM   #5
ndc85430
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Hmm, perhaps I misunderstood what you want to do. Browsers don't execute Bash scripts, either.
 
Old 05-18-2014, 01:45 PM   #6
dijetlo
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Quote:
Hmm, perhaps I misunderstood what you want to do. Browsers don't execute Bash scripts, either.
Very true, but you were close when you mentioned PHP and the Apache Server.
You can use PHP to make system calls (system()) which would execute a bash script, you just have to designate variables to capture the output. Then you can have the web server dynamically construct the page and serve it.
It's a great beginners PHP project if anybody is interested in learning PHP/Apache administration
 
Old 05-18-2014, 01:49 PM   #7
WasaProduction
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Lightbulb

Actually I found this page -> http://www.yolinux.com/TUTORIALS/Lin...ellScript.html
That i think it may help to create this script, but im still having trouble in undestanding how it works. I noticed that it is using HTML but no really sure what does
Code:
/bin/cat << EOM
is suposed to do, and if it affects that my scripts are in /var/www/html
Thanks.
 
Old 05-18-2014, 01:57 PM   #8
unSpawn
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Quote:
Originally Posted by ndc85430 View Post
The web server probably doesn't know how to run Bash scripts.
That indeed is not listed in a stock httpd configuration.


Quote:
Originally Posted by ndc85430 View Post
I don't know if it's possible to do that with Apache, either.
Yes, Apache can (just configure it to accept BASH scripts as valid CGI) but obviously there's languages that are traditionally or commonly used as CGI.


Quote:
Originally Posted by WasaProduction View Post
(..) what Im trying to do here is to make them work in the browser by calling the script (..)
If there's no specific reason for using a browser (you haven't told us about BTW) then why not use SSH instead? As in 'ssh user@system some commands;'? (Also note that if your question is part of Something Completely Different you may run into commands that require more privileges than the user the web server runs as is allowed. If and once you've reached that stage please consider very carefully security-wise which replies you accept as as valid answer. The Devil's in the details, there's often multiple approaches and solutions, so please be clear and detailed in what you ask for.)
 
Old 05-18-2014, 02:16 PM   #9
WasaProduction
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What im trying to acomplish here is something that a professor said that could be done, there is no point in using a browser, only finding if it is possible, and yes it is very insecure, everything im creating has all the permissions that i could give it and everyone can access them (fortunately im in a virtual machine). but it think that as it is shown in the page
Quote:
Actually I found this page -> http://www.yolinux.com/TUTORIALS/Lin...ellScript.html
there is a way and maybe there are not 100% bash commands and it have some HTML but if I can achive it lets go for it, but im new in this so i dont fully understand what they are doing there in order to apply it myself.
Thanks.

Last edited by WasaProduction; 05-18-2014 at 02:19 PM.
 
Old 05-18-2014, 02:35 PM   #10
ndc85430
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The link you posted is related to what unSpawn posted above about CGI. It looks like the scripts there are generating the response - some HTML with the contents of a file in it. The stuff between "/bin/cat << EOM" and "EOM" at the bottom of the script is known as a here document.
 
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