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bin group strange permissions

 
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Old 10-22-2008
bin group strange permissions
I was doing a little playing around with permissions on a 5.3 box in the office and wanted to make it so that it does not take root permission to delete a users home directory once they are deactivated or deleted in smit.
the default permissions are 755 with bin as both user and group
I noticed that if i change the permissions to 775 and give a typical user group membership in bin he can not delete a file in that folder.
I noticed also that if i change the group ownership of the directory to staff, (which my user also has membership) folders contained inside I can delete.

is there something special about the bin group that would prevent even a user who has group membership from being able to take advantage of them when bin is the group owner of the folder?
 
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LEARN ABOUT BSD

strmode

STRMODE(3)                                                 BSD Library Functions Manual                                                 STRMODE(3)

NAME

     strmode -- convert inode status information into a symbolic string

LIBRARY

     Utility functions from BSD systems (libbsd, -lbsd)

SYNOPSIS

     #include <bsd/string.h>

     void
     strmode(mode_t mode, char *bp);

DESCRIPTION

     The strmode() function converts a file mode (the type and permission information associated with an inode, see stat(2)) into a symbolic
     string which is stored in the location referenced by bp.  This stored string is eleven characters in length plus a trailing NUL.

     The first character is the inode type, and will be one of the following:

           -     regular file
           b     block special
           c     character special
           d     directory
           l     symbolic link
           p     fifo
           s     socket
           w     whiteout
           ?     unknown inode type

     The next nine characters encode three sets of permissions, in three characters each.  The first three characters are the permissions for the
     owner of the file, the second three for the group the file belongs to, and the third for the ``other'', or default, set of users.

     Permission checking is done as specifically as possible.  If read permission is denied to the owner of a file in the first set of permis-
     sions, the owner of the file will not be able to read the file.  This is true even if the owner is in the file's group and the group permis-
     sions allow reading or the ``other'' permissions allow reading.

     If the first character of the three character set is an ``r'', the file is readable for that set of users; if a dash ``-'', it is not read-
     able.

     If the second character of the three character set is a ``w'', the file is writable for that set of users; if a dash ``-'', it is not
     writable.

     The third character is the first of the following characters that apply:

     S     If the character is part of the owner permissions and the file is not executable or the directory is not searchable by the owner, and
           the set-user-id bit is set.

     S     If the character is part of the group permissions and the file is not executable or the directory is not searchable by the group, and
           the set-group-id bit is set.

     T     If the character is part of the other permissions and the file is not executable or the directory is not searchable by others, and the
           ``sticky'' (S_ISVTX) bit is set.

     s     If the character is part of the owner permissions and the file is executable or the directory searchable by the owner, and the set-
           user-id bit is set.

     s     If the character is part of the group permissions and the file is executable or the directory searchable by the group, and the set-
           group-id bit is set.

     t     If the character is part of the other permissions and the file is executable or the directory searchable by others, and the ``sticky''
           (S_ISVTX) bit is set.

     x     The file is executable or the directory is searchable.

     -     None of the above apply.

     The last character is a plus sign ``+'' if any there are any alternate or additional access control methods associated with the inode, other-
     wise it will be a space.

SEE ALSO

     chmod(1), find(1), stat(2), getmode(3), setmode(3)

HISTORY

     The strmode() function first appeared in 4.4BSD.

BSD                                                                July 28, 1994                                                               BSD