selinux_set_mapping(3) SELinux API documentation selinux_set_mapping(3)
NAME
selinux_set_mapping - establish dynamic object class and permission
mapping
SYNOPSIS
#include <selinux/selinux.h>
struct security_class_mapping {
const char *name;
const char *perms[];
};
int selinux_set_mapping(struct security_class_mapping *map);
DESCRIPTION
selinux_set_mapping() establishes a mapping from a user-provided order-
ing of object classes and permissions to the numbers actually used by
the loaded system policy. If using this function, applications should
also set a SELINUX_CB_POLICYLOAD callback via selinux_set_callback(3)
that calls this function again upon a policy reload to re-create the
mapping in case the class or permission values change in the new pol-
icy. Generally it is preferred to instead use selinux_check_access(3)
instead of avc_has_perm(3) or security_compute_av(3) and not use this
function at all.
After the mapping is established, all libselinux functions that operate
on class and permission values take the user-provided numbers, which
are determined as follows:
The map argument consists of an array of security_class_mapping struc-
tures, which must be terminated by a structure having a NULL name
field. Except for this last structure, the name field should refer to
the string name of an object class, and the corresponding perms field
should refer to an array of permission bit names terminated by a NULL
string.
The object classes named in the mapping and the bit indexes of each set
of permission bits named in the mapping are numbered in order starting
from 1. These numbers are the values that should be passed to subse-
quent libselinux calls.
RETURN VALUE
Zero is returned on success. On error, -1 is returned and errno is set
appropriately.
ERRORS
EINVAL One of the class or permission names requested in the mapping is
not present in the loaded policy.
ENOMEM An attempt to allocate memory failed.
EXAMPLE
struct security_class_mapping map[] = {
{ "file", { "create", "unlink", "read", "write", NULL } },
{ "socket", { "bind", NULL } },
{ "process", { "signal", NULL } },
{ NULL }
};
if (selinux_set_mapping(map) < 0)
exit(1);
In this example, after the call has succeeded, classes file, socket,
and process will be identified by 1, 2 and 3, respectively. Permis-
sions create, unlink, read, and write (for the file class) will be
identified by 1, 2, 4, and 8 respectively. Classes and permissions not
listed in the mapping cannot be used.
AUTHOR
Originally Eamon Walsh. Updated by Stephen Smalley <sds@tycho.nsa.gov>
SEE ALSO
selinux_check_access(3), selinux_set_callback(3), avc_has_perm(3),
selinux(8)
12 Jun 2008 selinux_set_mapping(3)
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