security/mac_label.c

   1 /*-
   2  * Copyright (c) 2004 Networks Associates Technology, Inc.
   3  * Copyright (c) 2005 SPARTA, Inc.
   4  * All rights reserved.
   5  *
   6  * This software was developed for the FreeBSD Project in part by Network
   7  * Associates Laboratories, the Security Research Division of Network
   8  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
   9  * as part of the DARPA CHATS research program.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <kern/zalloc.h>
  34 #include <security/_label.h>
  35 #include <sys/param.h>
  36 #include <sys/queue.h>
  37 #include <sys/systm.h>
  38 #include <security/mac_internal.h>
  39
  40 static ZONE_DECLARE(zone_label, "MAC Labels", sizeof(struct label), ZC_ZFREE_CLEARMEM);
  41
  42 struct label *
  43 mac_labelzone_alloc(int flags)
  44 {
  45         int zflags = Z_ZERO | (flags & MAC_NOWAIT);
  46         struct label *l;
  47
  48         static_assert(MAC_NOWAIT == Z_NOWAIT);
  49         l = zalloc_flags(zone_label, zflags);
  50         if (l) {
  51                 l->l_flags = MAC_FLAG_INITIALIZED;
  52         }
  53         return l;
  54 }
  55
  56 void
  57 mac_labelzone_free(struct label *l)
  58 {
  59         if (l == NULL) {
  60                 panic("Free of NULL MAC label\n");
  61         }
  62
  63         if ((l->l_flags & MAC_FLAG_INITIALIZED) == 0) {
  64                 panic("Free of uninitialized label\n");
  65         }
  66         bzero(l, sizeof(struct label));
  67         zfree(zone_label, l);
  68 }
  69
  70 /*
  71  * Functions used by policy modules to get and set label values.
  72  */
  73 intptr_t
  74 mac_label_get(struct label *l, int slot)
  75 {
  76         KASSERT(l != NULL, ("mac_label_get: NULL label"));
  77
  78         return (intptr_t) (l->l_perpolicy[slot].l_ptr);
  79 }
  80
  81 void
  82 mac_label_set(struct label *l, int slot, intptr_t v)
  83 {
  84         KASSERT(l != NULL, ("mac_label_set: NULL label"));
  85
  86         l->l_perpolicy[slot].l_ptr = (void *) v;
  87 }