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# 1  
Old 12-13-2008
Error Apache Problems.
Hello guys

I have been running a LAMP stack for awhile now but have never really explored the server side end of things. What I am trying to do is have a python script on a website run a bash command. This will accomplish a system so someone can create an account for proxy access via a webpage. I am running Ubuntu server edition 8.04.1


Here is my python script (For testing purposes) to do so:
Code:
import os

def main():
    username = "Test1"
    password = "Enter new password"
    os.system("htpasswd -b /etc/squid/passwd '%s' '%s'" % (username.replace("'"$
    return apache.OK
if __name__ == '__main__': main()

Now I read a bit on the net and from what I gathered I would need to run this as a CGI script. So I placed it in my /usr/lib/cgi-bin/ directory as a .py file.

Then when I go to my site (mysite.com/cgi-bin/program.py)

I get a 500 internal server error. So Once again I looked around and I figured out that I had bad handlers in my site configuration so I tried various different things and nothing seemed to work so I reset my site configuration to as follows:
Code:
NameVirtualHost *
<VirtualHost *>
        ServerAdmin webmaster@localhost

        DocumentRoot /home/carter/public_html
        <Directory />
                Options FollowSymLinks
                AllowOverride None
        </Directory>
        <Directory /home/carter/public_html>
                Options Indexes FollowSymLinks MultiViews
                AllowOverride None
                Order allow,deny
                allow from all
        </Directory>

        ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
        <Directory "/usr/lib/cgi-bin">
                AllowOverride None
                Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
                Order allow,deny
                Allow from all
        </Directory>

Here is a section of my error log that pertains to this error:
Code:
[Sun Dec 07 06:33:46 2008] [notice] mod_python: Creating 8 session mutexes based on 150 max processes and 0 max threads.
[Sun Dec 07 06:33:46 2008] [notice] mod_python: using mutex_directory /tmp
[Sun Dec 07 06:33:46 2008] [notice] Apache/2.2.8 (Ubuntu) mod_python/3.3.1 Python/2.5.2 PHP/5.2.4-2ubuntu5.3 with Suhosin-Patch configured -- resuming normal operations
[Sun Dec 07 09:42:16 2008] [error] [client 222.187.220.162] script '/home/carter/public_html/prx1.php' not found or unable to stat
[Sun Dec 07 18:51:35 2008] [error] [client 137.186.97.98] File does not exist: /home/carter/public_html/favicon.ico
[Sun Dec 07 22:14:22 2008] [error] [client 192.168.1.4] File does not exist: /home/carter/public_html/mad_scientist.txt
[Sun Dec 07 22:24:23 2008] [error] [client 72.25.192.4] File does not exist: /home/carter/public_html/favicon.ico
[Sun Dec 07 23:52:00 2008] [error] [client 222.187.220.162] script '/home/carter/public_html/prx1.php' not found or unable to stat
[Mon Dec 08 17:53:46 2008] [notice] caught SIGWINCH, shutting down gracefully
[Mon Dec 08 17:53:57 2008] [notice] mod_python: Creating 8 session mutexes based on 150 max processes and 0 max threads.
[Mon Dec 08 17:53:57 2008] [notice] mod_python: using mutex_directory /tmp
[Mon Dec 08 17:53:57 2008] [notice] Apache/2.2.8 (Ubuntu) mod_python/3.3.1 Python/2.5.2 PHP/5.2.4-2ubuntu5.3 with Suhosin-Patch configured -- resuming normal operations
[Mon Dec 08 17:54:23 2008] [error] [client 192.168.1.4] (8)Exec format error: exec of '/usr/lib/cgi-bin/carternet.py' failed
[Mon Dec 08 17:54:23 2008] [error] [client 192.168.1.4] Premature end of script headers: carternet.py

Any help would be awesome. Thank you.
# 2  
Old 12-13-2008
My guess is that the webserver does not have permissions to run the htpasswd command and store the file in /etc/squid/passwd.

The other possibility, if your code as posted is what you actually used is the fact that the line running the htpasswd is syntactically incorrect ( I assume the end of the line is just missing in your post).
# 3  
Old 12-13-2008
Yeah, sorry, I didn't realize the script was cut off, although it seemed to only be cut off when I posted here (The actual script on the box is fine). I also thought it was a permissions problem but I gave my cgi-bin and the script it's self 777 permissions.

It is the premature end of headers that is causing the 500 Internal error.
# 4  
Old 12-13-2008
Never give cgi-bin 777 permissions and never give anything in cgi-bin 777 permissions.

Try running your python script as the apache user (www-data) and see if it give any errors. I think the problem is in your script, not in the headers it creates. The reason it gives the header error is that the script exits with a non-zero exit code, and I'm pretty sure it's to do with the permissions of the webserver user to write to /etc/squid/passwd.
# 5  
Old 12-14-2008
is AddHandler cgi-script py set in the apache config?

what is the first line of your script? it should be #!/usr/bin/python or whatever the path is.

also, you need to print the content-type in your script.
# 6  
Old 12-14-2008
Alright. Here is the full script that I am running:
Code:
#!/usr/bin/python
print "Content-type: text/html"
import os

def main():
    username = raw_input ("Enter new username: ")
    password = raw_input ("Enter new password: ")
    os.system("htpasswd -b /etc/squid/passwd '%s' '%s'" % (username.replace("'", ""), password.replace("'", "")))

if __name__ == '__main__': main()

I added the Addhandler in there as well. Same 500 Server error. Also I changed the /etc/squid/passwd to 777.
# 7  
Old 12-14-2008
add two new lines. to your print statement


Code:
print "Content-type: text/html\n\n"
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