mac_get(3)

NAME

mac_get_file, mac_get_link, mac_get_fd, mac_get_peer,

mac_get_pid,
mac_get_proc - get the label of a file, socket, socket peer

or process

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <sys/mac.h>
int
mac_get_file(const char *path, mac_t label);
int
mac_get_link(const char *path, mac_t label);
int
mac_get_fd(int fd, mac_t label);
int
mac_get_peer(int fd, mac_t label);
int
mac_get_pid(pid_t pid, mac_t label);
int
mac_get_proc(mac_t label);

DESCRIPTION

The mac_get_file() system call returns the label associated

with a file
specified by pathname. The mac_get_link() function is the

same as
mac_get_file(), except that it does not follow symlinks.

The mac_get_fd() system call returns the label associated

with an object
referenced by the specified file descriptor. Note that in

the case of a
file system socket, the label returned will be the socket

label, which
may be different from the label of the on-disk node acting

as a rendezvous for the socket. The mac_get_peer() system call re

turns the label
associated with the remote endpoint of a socket; the exact

semantics of
this call will depend on the protocol domain, communications

type, and
endpoint; typically this label will be cached when a connec

tion-oriented
protocol instance is first set up, and is undefined for

datagram protocols.

The mac_get_pid() and mac_get_proc() system calls return the

process
label associated with an arbitrary process ID, or the cur

rent process.

Label storage for use with these calls must first be allo

cated and prepared using the mac_prepare(3) functions. When an applica

tion is done
using a label, the memory may be returned using mac_free(3).

ERRORS

[EACCES] A component of path is not searchable, or

MAC read

access to the file is denied.

[EINVAL] The requested label operation is not

valid for the

object referenced by fd.

[ENAMETOOLONG] The pathname pointed to by path exceeds

PATH_MAX, or a

component of the pathname exceeds

NAME_MAX.

[ENOENT] A component of path does not exist.

[ENOMEM] Insufficient memory is available to allo

cate a new MAC

label structure.

[ENOTDIR] A component of path is not a directory.

SEE ALSO

mac(3), mac_free(3), mac_prepare(3), mac_set(3),

mac_text(3), mac(4),
mac(9)

STANDARDS

POSIX.1e is described in IEEE POSIX.1e draft 17. Discussion

of the draft
continues on the cross-platform POSIX.1e implementation

mailing list. To
join this list, see the FreeBSD POSIX.1e implementation page

for more
information.

HISTORY

Support for Mandatory Access Control was introduced in

FreeBSD 5.0 as
part of the TrustedBSD Project.

BSD December 21, 2001

BSD