[Proftpd-user] How to protect datafiles

Hi,

I use proftpd to receive data from automatic dataloggers. 
Every day many dataloggers around the world put data on my server.
They use to append files.

Some users have the same login as a datalogger to get access to the data.
So I would like to limit the kind of operations that can be done, to protect data.

So for a specific user, I would like to be able to limit  operation to : CREAT a file, APPEND a file, READ a file, LIST DIR  and CHANGE DIR.

Only ftpadm can delete a file.

My configuration is : 

<Directory ~>
  <Limit DELE>
     AllowUser ftpadm
     DenyAll
  </Limit>
  <Limit LOGIN WRITE STOR LIST NLST STAT>
     AllowUser TOTO TATA TITI
     DenyAll
  </Limit>
</Directory>

In fact, any user can modify a file, move it to an other directory, but can’t delete it.

How to specify only CREAT a life, APPEND a file, READ a file, LIST and CHANGEDIR can be done.

Thank you very much,

regards

Fred


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