How to run my own FTP server without root permissions


 
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Top Forums UNIX for Advanced & Expert Users How to run my own FTP server without root permissions
# 1  
Old 10-31-2006
How to run my own FTP server without root permissions

Hi all,
I need your help with this problem.

I have my own ftp server implemented in java. If I start it as root it is successfully binded to port 21 and everything works. Now I want to run it as non-root user, but for binding to port 21 it needs root rights. How to solve it?

I alrady try xinetd, but it probably has no feature I need (xinetd starts for each request new instance of server whether single-treaded or not, but I need to start one instance of my ftp server which is capable to handle many request at one time itself).

Any ideas are welcomed.
Regards,
Jirka
# 2  
Old 10-31-2006
If you'd used any language but java, I'd suggest running it as root and using setuid to reduce permissions thereafter. But this'd be meaningless for a java thread...
# 3  
Old 10-31-2006
I don't know how your server is implemented, but you might want to take a look at Perderabo's post in this thread.
# 4  
Old 11-01-2006
I wrote something similar for my own personal use. If you want to support multiple user authentication, etc. , that would be impossible without root, as previously specified in the link above.

But if you are only going to be using this as a file transfer tool for one user, you can run the server as that user. Just change the port to a number between 1024 and 65536. ( First 1024 are generally reserved for system use and it's possible you won't have permissions to bind to them. )
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