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_t zone_label;
  41
  42 void
  43 mac_labelzone_init(void)
  44 {
  45         zone_label = zinit(sizeof(struct label),
  46             8192 * sizeof(struct label),
  47             sizeof(struct label), "MAC Labels");
  48         zone_change(zone_label, Z_EXPAND, TRUE);
  49         zone_change(zone_label, Z_EXHAUST, FALSE);
  50         zone_change(zone_label, Z_CALLERACCT, FALSE);
  51 }
  52
  53 struct label *
  54 mac_labelzone_alloc(int flags)
  55 {
  56         struct label *l;
  57
  58         if (flags & MAC_NOWAIT) {
  59                 l = (struct label *) zalloc_noblock(zone_label);
  60         } else {
  61                 l = (struct label *) zalloc(zone_label);
  62         }
  63         if (l == NULL) {
  64                 return NULL;
  65         }
  66
  67         bzero(l, sizeof(struct label));
  68         l->l_flags = MAC_FLAG_INITIALIZED;
  69         return l;
  70 }
  71
  72 void
  73 mac_labelzone_free(struct label *l)
  74 {
  75         if (l == NULL) {
  76                 panic("Free of NULL MAC label\n");
  77         }
  78
  79         if ((l->l_flags & MAC_FLAG_INITIALIZED) == 0) {
  80                 panic("Free of uninitialized label\n");
  81         }
  82         bzero(l, sizeof(struct label));
  83         zfree(zone_label, l);
  84 }
  85
  86 /*
  87  * Functions used by policy modules to get and set label values.
  88  */
  89 intptr_t
  90 mac_label_get(struct label *l, int slot)
  91 {
  92         KASSERT(l != NULL, ("mac_label_get: NULL label"));
  93
  94         return (intptr_t) (l->l_perpolicy[slot].l_ptr);
  95 }
  96
  97 void
  98 mac_label_set(struct label *l, int slot, intptr_t v)
  99 {
 100         KASSERT(l != NULL, ("mac_label_set: NULL label"));
 101
 102         l->l_perpolicy[slot].l_ptr = (void *) v;
 103 }