Andy asks:

Yes, one way to do it is to write a small script (command) that reads the current directory; gets the owner and group information of a file that is an argument to the script. The script may have to be set SUID with ownership root. This is not very secure, but you asked 'is it possible?' The more complex the security requirements, the more involved.

You might also do it any other number of ways, using ACL front ends, perl scripts, a simple C program, etc.

The easiest way to do it, if you are worried about security is to have the administrator with root privs do it

Or, you can find some complex ACL program; but based on what you have offered as your requirements, this still seems to be a lot of trouble for something quite basic.

If I had a system that had a user or user process creating files I would not want the scripts to have any ability to write or give ownership to the file to another user unless the user was in the same group. If the issue was with many files, I would look at creating a process to do this.

However, without understanding the purpose of the server, the nature of the processes, the relationship of users to the processes, the production environment and security implications and risk; it is not reasonable to give a simplistic answer.

Everything is possible in UNIX and there is no one way to do anything