home *** CD-ROM | disk | FTP | other *** search
- !==
- !== UNIX_SECURITY.txt for Samba release 1.9.18p10 20 Aug 1998
- !==
- Contributor: John H Terpstra <jht@samba.anu.edu.au>
- Date: July 5, 1998
- Status: Current
-
- Subject: SETTING UNIX FILE SYSTEM SECURITY
- ===============================================================================
- The following excerpt from a bug report demonstrates the need to
- understand Unix file system security and to manage it correctly.
-
- Quote:
- ======
- > We are unable to keep individual users from mapping to any other user's
- > home directory once they have supplied a valid password! They only need
- > to enter their own password. I have not found *any* method that I can
- > use to configure samba to enforce that only a user may map their own
- > home directory.
- >
- > User xyzzy can map his home directory. Once mapped user xyzzy can also map
- > *anyone* elses home directory!
-
- ANSWER:
- =======
- This is not a security flaw, it is by design. Samba allows
- users to have *exactly* the same access to the UNIX filesystem
- as they would if they were logged onto the UNIX box, except
- that it only allows such views onto the file system as are
- allowed by the defined shares.
-
- This means that if your UNIX home directories are set up
- such that one user can happily cd into another users
- directory and do an ls, the UNIX security solution is to
- change the UNIX file permissions on the users home directories
- such that the cd and ls would be denied.
-
- Samba tries very had not to second guess the UNIX administrators
- security policies, and trusts the UNIX admin to set
- the policies and permissions he or she desires.
-
- Samba does allow the setup you require when you have set the
- "only user = yes" option on the share, is that you have not set the
- valid users list for the share.
-
- Note that only user works in conjunction with the users= list,
- so to get the behavior you require, add the line :
-
- user = %S
-
- to the definition of the [homes] share, as recommended in
- the smb.conf man page.
-
-