access to files at the filesystem

["Lars Weste" <lweste () gmx de>]

Hi all,  
 
I have a requirement to secure the access to files at the filesystem. The 
Operating system used will be a SuSE linux box. 
  
1. Each file created in a directory inherits the access rights of the 
directory 
2. Each directory created inherits the access rights of the directory 
3. A file or directory created by a user who is member of group A,B and C  
should be readable by another user if he/she is member of either group A  
or B or C.  
 
The first two points can be implemented with the default directive of the 
linux filesystem acl's. 
 
Anybody with an idea on how to implement the third point would be great. 
 
kind regards 
lars 

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