Hello Frank,
I would like to understand what the difference between:
1. Normal ACLs that are referenced through libacl.
2. Extended attribute referenced by the API you show below.
3. Selinux security contexts which are referenced through the
getfilecon and setfilecon API.
In particular, does Bacula need to backup normal ACLs, Extended ACLs and
Selinux security contexts if all three APIs are available on a system (such
as my CentOS 5.2 system)?? Or does backing up/restoring extended ACLs
automatically include the others????
Best regards,
Kern
On Wednesday 04 January 2006 22:07:01 Frank Sweetser wrote:
> On Wed, Jan 04, 2006 at 09:57:46PM +0100, Kern Sibbald wrote:
> > Not quite.
> >
> > I run SELinux here on my server so I have a reasonable idea (rather
> > primitave though) of how it works. Are you telling me that libacl
> > returns only a subset of the possible extended attributes? If that is
> > the case, it seems to me that we should modify the Bacula ACL code to
> > save/restore *all* the extended attributes. However, maybe that is not
> > so easy.
>
> If possible, yes, I'd certainly agree =)
>
> > Do you have any idea what the low level system calls are that get/set
> > extended attributes? (i.e. what does getfattr and setfattr use?).
>
> It uses the *xattr family of functions
>
> #include <sys/types.h>
> #include <attr/xattr.h>
>
> ssize_t getxattr (const char *path, const char *name, ...
> ssize_t lgetxattr (const char *path, const char *name, ...
> ssize_t fgetxattr (int filedes, const char *name, ...
>
> ssize_t listxattr (const char *path, ...
> ssize_t llistxattr (const char *path, ...
> ssize_t flistxattr (int filedes, ...
>
> int setxattr (const char *path, const char *name, ...
> int lsetxattr (const char *path, const char *name, ...
> int fsetxattr (int filedes, const char *name, ...
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