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How to get write permission through web/cgi?

shuchunz
shuchunz asked
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Last Modified: 2013-12-25
Hi,
I am writing a cgi-perl script that need to open a file(new file),this script will work for all people who have accounts on our server,it should create file in their own home directory.I can check their login names and passwords(let's not worry about security about passwords here).I tried so hard just can not open a file even I made the owner of the script as root(superuser).But if I create a empty file before I run the script(give it write permission), it works!
I hope I do not have to make home directory writeable, and the files have to be in home directory.
Thanks.
shu
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It doesn't matter who is the owner of the CGI script.
The script permissions say who can execute the script, but the script itself is run by the web server, which is often user nobody.

So user nobody runs a script which tries to create a file into a directory, and the directory permissions matter: in order to allow the CGI script to create a file, you must make the directory _writable_ to the user who runs the CGI; if the web server runs as user nobody, the directory must be writable by all (i.e. directory mode must be 777 - read, write, search by all).

HTH, julio

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Commented:
Thank you, Julio, your answer helps, but I and other people can not make their home directory writable, anyway I have tried what you suggested and it did work.
shu

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Commented:
Edited text of question
Hello shu,

i'm afraid you want get any further help on this subject, apart by me, since you accepted the answer and this has become a 'Previously Asked Question'.

About your problem, i may see one only work-around, which involves the system administrator's support:

on the target machine there should be a server application which runs as user root (or any other user who may have write permissions on your directories);

your CGI then connects to this server program (maybe through a socket), passing it user name and data to store into the file; the server prog at its turn creates the file in the right directory, possibly setting its owner and permissions, so that the user may then access it.

HTH, julio
Hello shu,

i'm afraid you want get any further help on this subject, apart by me, since you accepted the answer and this has become a 'Previously Asked Question'.

About your problem, i may see one only work-around, which involves the system administrator's support:

on the target machine there should be a server application which runs as user root (or any other user who may have write permissions on your directories);

your CGI then connects to this server program (maybe through a socket), passing it user name and data to store into the file; the server prog at its turn creates the file in the right directory, possibly setting its owner and permissions, so that the user may then access it.

HTH, julio
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