The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/security/mac_biba/mac_biba.c

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    1 /*-
    2  * Copyright (c) 1999-2002, 2007-2011 Robert N. M. Watson
    3  * Copyright (c) 2001-2005 McAfee, Inc.
    4  * Copyright (c) 2006 SPARTA, Inc.
    5  * All rights reserved.
    6  *
    7  * This software was developed by Robert Watson for the TrustedBSD Project.
    8  *
    9  * This software was developed for the FreeBSD Project in part by McAfee
   10  * Research, the Security Research Division of McAfee, Inc. under
   11  * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
   12  * CHATS research program.
   13  *
   14  * This software was enhanced by SPARTA ISSO under SPAWAR contract
   15  * N66001-04-C-6019 ("SEFOS").
   16  *
   17  * This software was developed at the University of Cambridge Computer
   18  * Laboratory with support from a grant from Google, Inc.
   19  *
   20  * Redistribution and use in source and binary forms, with or without
   21  * modification, are permitted provided that the following conditions
   22  * are met:
   23  * 1. Redistributions of source code must retain the above copyright
   24  *    notice, this list of conditions and the following disclaimer.
   25  * 2. Redistributions in binary form must reproduce the above copyright
   26  *    notice, this list of conditions and the following disclaimer in the
   27  *    documentation and/or other materials provided with the distribution.
   28  *
   29  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   39  * SUCH DAMAGE.
   40  *
   41  * $FreeBSD: releng/11.2/sys/security/mac_biba/mac_biba.c 267992 2014-06-28 03:56:17Z hselasky $
   42  */
   43 
   44 /*
   45  * Developed by the TrustedBSD Project.
   46  *
   47  * Biba fixed label mandatory integrity policy.
   48  */
   49 
   50 #include <sys/param.h>
   51 #include <sys/conf.h>
   52 #include <sys/extattr.h>
   53 #include <sys/kernel.h>
   54 #include <sys/ksem.h>
   55 #include <sys/malloc.h>
   56 #include <sys/mman.h>
   57 #include <sys/mount.h>
   58 #include <sys/priv.h>
   59 #include <sys/proc.h>
   60 #include <sys/sbuf.h>
   61 #include <sys/systm.h>
   62 #include <sys/sysproto.h>
   63 #include <sys/sysent.h>
   64 #include <sys/systm.h>
   65 #include <sys/vnode.h>
   66 #include <sys/file.h>
   67 #include <sys/socket.h>
   68 #include <sys/socketvar.h>
   69 #include <sys/pipe.h>
   70 #include <sys/sx.h>
   71 #include <sys/sysctl.h>
   72 #include <sys/msg.h>
   73 #include <sys/sem.h>
   74 #include <sys/shm.h>
   75 
   76 #include <fs/devfs/devfs.h>
   77 
   78 #include <net/bpfdesc.h>
   79 #include <net/if.h>
   80 #include <net/if_types.h>
   81 #include <net/if_var.h>
   82 
   83 #include <netinet/in.h>
   84 #include <netinet/in_pcb.h>
   85 #include <netinet/ip_var.h>
   86 
   87 #include <vm/uma.h>
   88 #include <vm/vm.h>
   89 
   90 #include <security/mac/mac_policy.h>
   91 #include <security/mac_biba/mac_biba.h>
   92 
   93 SYSCTL_DECL(_security_mac);
   94 
   95 static SYSCTL_NODE(_security_mac, OID_AUTO, biba, CTLFLAG_RW, 0,
   96     "TrustedBSD mac_biba policy controls");
   97 
   98 static int      biba_label_size = sizeof(struct mac_biba);
   99 SYSCTL_INT(_security_mac_biba, OID_AUTO, label_size, CTLFLAG_RD,
  100     &biba_label_size, 0, "Size of struct mac_biba");
  101 
  102 static int      biba_enabled = 1;
  103 SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RWTUN, &biba_enabled,
  104     0, "Enforce MAC/Biba policy");
  105 
  106 static int      destroyed_not_inited;
  107 SYSCTL_INT(_security_mac_biba, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
  108     &destroyed_not_inited, 0, "Count of labels destroyed but not inited");
  109 
  110 static int      trust_all_interfaces = 0;
  111 SYSCTL_INT(_security_mac_biba, OID_AUTO, trust_all_interfaces, CTLFLAG_RDTUN,
  112     &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba");
  113 
  114 static char     trusted_interfaces[128];
  115 SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RDTUN,
  116     trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/Biba");
  117 
  118 static int      max_compartments = MAC_BIBA_MAX_COMPARTMENTS;
  119 SYSCTL_INT(_security_mac_biba, OID_AUTO, max_compartments, CTLFLAG_RD,
  120     &max_compartments, 0, "Maximum supported compartments");
  121 
  122 static int      ptys_equal = 0;
  123 SYSCTL_INT(_security_mac_biba, OID_AUTO, ptys_equal, CTLFLAG_RWTUN, &ptys_equal,
  124     0, "Label pty devices as biba/equal on create");
  125 
  126 static int      interfaces_equal = 1;
  127 SYSCTL_INT(_security_mac_biba, OID_AUTO, interfaces_equal, CTLFLAG_RWTUN,
  128     &interfaces_equal, 0, "Label network interfaces as biba/equal on create");
  129 
  130 static int      revocation_enabled = 0;
  131 SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RWTUN,
  132     &revocation_enabled, 0, "Revoke access to objects on relabel");
  133 
  134 static int      biba_slot;
  135 #define SLOT(l) ((struct mac_biba *)mac_label_get((l), biba_slot))
  136 #define SLOT_SET(l, val) mac_label_set((l), biba_slot, (uintptr_t)(val))
  137 
  138 static uma_zone_t       zone_biba;
  139 
  140 static __inline int
  141 biba_bit_set_empty(u_char *set) {
  142         int i;
  143 
  144         for (i = 0; i < MAC_BIBA_MAX_COMPARTMENTS >> 3; i++)
  145                 if (set[i] != 0)
  146                         return (0);
  147         return (1);
  148 }
  149 
  150 static struct mac_biba *
  151 biba_alloc(int flag)
  152 {
  153 
  154         return (uma_zalloc(zone_biba, flag | M_ZERO));
  155 }
  156 
  157 static void
  158 biba_free(struct mac_biba *mb)
  159 {
  160 
  161         if (mb != NULL)
  162                 uma_zfree(zone_biba, mb);
  163         else
  164                 atomic_add_int(&destroyed_not_inited, 1);
  165 }
  166 
  167 static int
  168 biba_atmostflags(struct mac_biba *mb, int flags)
  169 {
  170 
  171         if ((mb->mb_flags & flags) != mb->mb_flags)
  172                 return (EINVAL);
  173         return (0);
  174 }
  175 
  176 static int
  177 biba_dominate_element(struct mac_biba_element *a, struct mac_biba_element *b)
  178 {
  179         int bit;
  180 
  181         switch (a->mbe_type) {
  182         case MAC_BIBA_TYPE_EQUAL:
  183         case MAC_BIBA_TYPE_HIGH:
  184                 return (1);
  185 
  186         case MAC_BIBA_TYPE_LOW:
  187                 switch (b->mbe_type) {
  188                 case MAC_BIBA_TYPE_GRADE:
  189                 case MAC_BIBA_TYPE_HIGH:
  190                         return (0);
  191 
  192                 case MAC_BIBA_TYPE_EQUAL:
  193                 case MAC_BIBA_TYPE_LOW:
  194                         return (1);
  195 
  196                 default:
  197                         panic("biba_dominate_element: b->mbe_type invalid");
  198                 }
  199 
  200         case MAC_BIBA_TYPE_GRADE:
  201                 switch (b->mbe_type) {
  202                 case MAC_BIBA_TYPE_EQUAL:
  203                 case MAC_BIBA_TYPE_LOW:
  204                         return (1);
  205 
  206                 case MAC_BIBA_TYPE_HIGH:
  207                         return (0);
  208 
  209                 case MAC_BIBA_TYPE_GRADE:
  210                         for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++)
  211                                 if (!MAC_BIBA_BIT_TEST(bit,
  212                                     a->mbe_compartments) &&
  213                                     MAC_BIBA_BIT_TEST(bit, b->mbe_compartments))
  214                                         return (0);
  215                         return (a->mbe_grade >= b->mbe_grade);
  216 
  217                 default:
  218                         panic("biba_dominate_element: b->mbe_type invalid");
  219                 }
  220 
  221         default:
  222                 panic("biba_dominate_element: a->mbe_type invalid");
  223         }
  224 
  225         return (0);
  226 }
  227 
  228 static int
  229 biba_subject_dominate_high(struct mac_biba *mb)
  230 {
  231         struct mac_biba_element *element;
  232 
  233         KASSERT((mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
  234             ("biba_effective_in_range: mb not effective"));
  235         element = &mb->mb_effective;
  236 
  237         return (element->mbe_type == MAC_BIBA_TYPE_EQUAL ||
  238             element->mbe_type == MAC_BIBA_TYPE_HIGH);
  239 }
  240 
  241 static int
  242 biba_range_in_range(struct mac_biba *rangea, struct mac_biba *rangeb)
  243 {
  244 
  245         return (biba_dominate_element(&rangeb->mb_rangehigh,
  246             &rangea->mb_rangehigh) &&
  247             biba_dominate_element(&rangea->mb_rangelow,
  248             &rangeb->mb_rangelow));
  249 }
  250 
  251 static int
  252 biba_effective_in_range(struct mac_biba *effective, struct mac_biba *range)
  253 {
  254 
  255         KASSERT((effective->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
  256             ("biba_effective_in_range: a not effective"));
  257         KASSERT((range->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
  258             ("biba_effective_in_range: b not range"));
  259 
  260         return (biba_dominate_element(&range->mb_rangehigh,
  261             &effective->mb_effective) &&
  262             biba_dominate_element(&effective->mb_effective,
  263             &range->mb_rangelow));
  264 
  265         return (1);
  266 }
  267 
  268 static int
  269 biba_dominate_effective(struct mac_biba *a, struct mac_biba *b)
  270 {
  271         KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
  272             ("biba_dominate_effective: a not effective"));
  273         KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
  274             ("biba_dominate_effective: b not effective"));
  275 
  276         return (biba_dominate_element(&a->mb_effective, &b->mb_effective));
  277 }
  278 
  279 static int
  280 biba_equal_element(struct mac_biba_element *a, struct mac_biba_element *b)
  281 {
  282 
  283         if (a->mbe_type == MAC_BIBA_TYPE_EQUAL ||
  284             b->mbe_type == MAC_BIBA_TYPE_EQUAL)
  285                 return (1);
  286 
  287         return (a->mbe_type == b->mbe_type && a->mbe_grade == b->mbe_grade);
  288 }
  289 
  290 static int
  291 biba_equal_effective(struct mac_biba *a, struct mac_biba *b)
  292 {
  293 
  294         KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
  295             ("biba_equal_effective: a not effective"));
  296         KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
  297             ("biba_equal_effective: b not effective"));
  298 
  299         return (biba_equal_element(&a->mb_effective, &b->mb_effective));
  300 }
  301 
  302 static int
  303 biba_contains_equal(struct mac_biba *mb)
  304 {
  305 
  306         if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
  307                 if (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL)
  308                         return (1);
  309         }
  310 
  311         if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) {
  312                 if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL)
  313                         return (1);
  314                 if (mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL)
  315                         return (1);
  316         }
  317 
  318         return (0);
  319 }
  320 
  321 static int
  322 biba_subject_privileged(struct mac_biba *mb)
  323 {
  324 
  325         KASSERT((mb->mb_flags & MAC_BIBA_FLAGS_BOTH) == MAC_BIBA_FLAGS_BOTH,
  326             ("biba_subject_privileged: subject doesn't have both labels"));
  327 
  328         /* If the effective is EQUAL, it's ok. */
  329         if (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL)
  330                 return (0);
  331 
  332         /* If either range endpoint is EQUAL, it's ok. */
  333         if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL ||
  334             mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL)
  335                 return (0);
  336 
  337         /* If the range is low-high, it's ok. */
  338         if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_LOW &&
  339             mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_HIGH)
  340                 return (0);
  341 
  342         /* It's not ok. */
  343         return (EPERM);
  344 }
  345 
  346 static int
  347 biba_high_effective(struct mac_biba *mb)
  348 {
  349 
  350         KASSERT((mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
  351             ("biba_equal_effective: mb not effective"));
  352 
  353         return (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_HIGH);
  354 }
  355 
  356 static int
  357 biba_valid(struct mac_biba *mb)
  358 {
  359 
  360         if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
  361                 switch (mb->mb_effective.mbe_type) {
  362                 case MAC_BIBA_TYPE_GRADE:
  363                         break;
  364 
  365                 case MAC_BIBA_TYPE_EQUAL:
  366                 case MAC_BIBA_TYPE_HIGH:
  367                 case MAC_BIBA_TYPE_LOW:
  368                         if (mb->mb_effective.mbe_grade != 0 ||
  369                             !MAC_BIBA_BIT_SET_EMPTY(
  370                             mb->mb_effective.mbe_compartments))
  371                                 return (EINVAL);
  372                         break;
  373 
  374                 default:
  375                         return (EINVAL);
  376                 }
  377         } else {
  378                 if (mb->mb_effective.mbe_type != MAC_BIBA_TYPE_UNDEF)
  379                         return (EINVAL);
  380         }
  381 
  382         if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) {
  383                 switch (mb->mb_rangelow.mbe_type) {
  384                 case MAC_BIBA_TYPE_GRADE:
  385                         break;
  386 
  387                 case MAC_BIBA_TYPE_EQUAL:
  388                 case MAC_BIBA_TYPE_HIGH:
  389                 case MAC_BIBA_TYPE_LOW:
  390                         if (mb->mb_rangelow.mbe_grade != 0 ||
  391                             !MAC_BIBA_BIT_SET_EMPTY(
  392                             mb->mb_rangelow.mbe_compartments))
  393                                 return (EINVAL);
  394                         break;
  395 
  396                 default:
  397                         return (EINVAL);
  398                 }
  399 
  400                 switch (mb->mb_rangehigh.mbe_type) {
  401                 case MAC_BIBA_TYPE_GRADE:
  402                         break;
  403 
  404                 case MAC_BIBA_TYPE_EQUAL:
  405                 case MAC_BIBA_TYPE_HIGH:
  406                 case MAC_BIBA_TYPE_LOW:
  407                         if (mb->mb_rangehigh.mbe_grade != 0 ||
  408                             !MAC_BIBA_BIT_SET_EMPTY(
  409                             mb->mb_rangehigh.mbe_compartments))
  410                                 return (EINVAL);
  411                         break;
  412 
  413                 default:
  414                         return (EINVAL);
  415                 }
  416                 if (!biba_dominate_element(&mb->mb_rangehigh,
  417                     &mb->mb_rangelow))
  418                         return (EINVAL);
  419         } else {
  420                 if (mb->mb_rangelow.mbe_type != MAC_BIBA_TYPE_UNDEF ||
  421                     mb->mb_rangehigh.mbe_type != MAC_BIBA_TYPE_UNDEF)
  422                         return (EINVAL);
  423         }
  424 
  425         return (0);
  426 }
  427 
  428 static void
  429 biba_set_range(struct mac_biba *mb, u_short typelow, u_short gradelow,
  430     u_char *compartmentslow, u_short typehigh, u_short gradehigh,
  431     u_char *compartmentshigh)
  432 {
  433 
  434         mb->mb_rangelow.mbe_type = typelow;
  435         mb->mb_rangelow.mbe_grade = gradelow;
  436         if (compartmentslow != NULL)
  437                 memcpy(mb->mb_rangelow.mbe_compartments, compartmentslow,
  438                     sizeof(mb->mb_rangelow.mbe_compartments));
  439         mb->mb_rangehigh.mbe_type = typehigh;
  440         mb->mb_rangehigh.mbe_grade = gradehigh;
  441         if (compartmentshigh != NULL)
  442                 memcpy(mb->mb_rangehigh.mbe_compartments, compartmentshigh,
  443                     sizeof(mb->mb_rangehigh.mbe_compartments));
  444         mb->mb_flags |= MAC_BIBA_FLAG_RANGE;
  445 }
  446 
  447 static void
  448 biba_set_effective(struct mac_biba *mb, u_short type, u_short grade,
  449     u_char *compartments)
  450 {
  451 
  452         mb->mb_effective.mbe_type = type;
  453         mb->mb_effective.mbe_grade = grade;
  454         if (compartments != NULL)
  455                 memcpy(mb->mb_effective.mbe_compartments, compartments,
  456                     sizeof(mb->mb_effective.mbe_compartments));
  457         mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
  458 }
  459 
  460 static void
  461 biba_copy_range(struct mac_biba *labelfrom, struct mac_biba *labelto)
  462 {
  463 
  464         KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
  465             ("biba_copy_range: labelfrom not range"));
  466 
  467         labelto->mb_rangelow = labelfrom->mb_rangelow;
  468         labelto->mb_rangehigh = labelfrom->mb_rangehigh;
  469         labelto->mb_flags |= MAC_BIBA_FLAG_RANGE;
  470 }
  471 
  472 static void
  473 biba_copy_effective(struct mac_biba *labelfrom, struct mac_biba *labelto)
  474 {
  475 
  476         KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
  477             ("biba_copy_effective: labelfrom not effective"));
  478 
  479         labelto->mb_effective = labelfrom->mb_effective;
  480         labelto->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
  481 }
  482 
  483 static void
  484 biba_copy(struct mac_biba *source, struct mac_biba *dest)
  485 {
  486 
  487         if (source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE)
  488                 biba_copy_effective(source, dest);
  489         if (source->mb_flags & MAC_BIBA_FLAG_RANGE)
  490                 biba_copy_range(source, dest);
  491 }
  492 
  493 /*
  494  * Policy module operations.
  495  */
  496 static void
  497 biba_init(struct mac_policy_conf *conf)
  498 {
  499 
  500         zone_biba = uma_zcreate("mac_biba", sizeof(struct mac_biba), NULL,
  501             NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
  502 }
  503 
  504 /*
  505  * Label operations.
  506  */
  507 static void
  508 biba_init_label(struct label *label)
  509 {
  510 
  511         SLOT_SET(label, biba_alloc(M_WAITOK));
  512 }
  513 
  514 static int
  515 biba_init_label_waitcheck(struct label *label, int flag)
  516 {
  517 
  518         SLOT_SET(label, biba_alloc(flag));
  519         if (SLOT(label) == NULL)
  520                 return (ENOMEM);
  521 
  522         return (0);
  523 }
  524 
  525 static void
  526 biba_destroy_label(struct label *label)
  527 {
  528 
  529         biba_free(SLOT(label));
  530         SLOT_SET(label, NULL);
  531 }
  532 
  533 /*
  534  * biba_element_to_string() accepts an sbuf and Biba element.  It converts
  535  * the Biba element to a string and stores the result in the sbuf; if there
  536  * isn't space in the sbuf, -1 is returned.
  537  */
  538 static int
  539 biba_element_to_string(struct sbuf *sb, struct mac_biba_element *element)
  540 {
  541         int i, first;
  542 
  543         switch (element->mbe_type) {
  544         case MAC_BIBA_TYPE_HIGH:
  545                 return (sbuf_printf(sb, "high"));
  546 
  547         case MAC_BIBA_TYPE_LOW:
  548                 return (sbuf_printf(sb, "low"));
  549 
  550         case MAC_BIBA_TYPE_EQUAL:
  551                 return (sbuf_printf(sb, "equal"));
  552 
  553         case MAC_BIBA_TYPE_GRADE:
  554                 if (sbuf_printf(sb, "%d", element->mbe_grade) == -1)
  555                         return (-1);
  556 
  557                 first = 1;
  558                 for (i = 1; i <= MAC_BIBA_MAX_COMPARTMENTS; i++) {
  559                         if (MAC_BIBA_BIT_TEST(i, element->mbe_compartments)) {
  560                                 if (first) {
  561                                         if (sbuf_putc(sb, ':') == -1)
  562                                                 return (-1);
  563                                         if (sbuf_printf(sb, "%d", i) == -1)
  564                                                 return (-1);
  565                                         first = 0;
  566                                 } else {
  567                                         if (sbuf_printf(sb, "+%d", i) == -1)
  568                                                 return (-1);
  569                                 }
  570                         }
  571                 }
  572                 return (0);
  573 
  574         default:
  575                 panic("biba_element_to_string: invalid type (%d)",
  576                     element->mbe_type);
  577         }
  578 }
  579 
  580 /*
  581  * biba_to_string() converts a Biba label to a string, and places the results
  582  * in the passed sbuf.  It returns 0 on success, or EINVAL if there isn't
  583  * room in the sbuf.  Note: the sbuf will be modified even in a failure case,
  584  * so the caller may need to revert the sbuf by restoring the offset if
  585  * that's undesired.
  586  */
  587 static int
  588 biba_to_string(struct sbuf *sb, struct mac_biba *mb)
  589 {
  590 
  591         if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
  592                 if (biba_element_to_string(sb, &mb->mb_effective) == -1)
  593                         return (EINVAL);
  594         }
  595 
  596         if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) {
  597                 if (sbuf_putc(sb, '(') == -1)
  598                         return (EINVAL);
  599 
  600                 if (biba_element_to_string(sb, &mb->mb_rangelow) == -1)
  601                         return (EINVAL);
  602 
  603                 if (sbuf_putc(sb, '-') == -1)
  604                         return (EINVAL);
  605 
  606                 if (biba_element_to_string(sb, &mb->mb_rangehigh) == -1)
  607                         return (EINVAL);
  608 
  609                 if (sbuf_putc(sb, ')') == -1)
  610                         return (EINVAL);
  611         }
  612 
  613         return (0);
  614 }
  615 
  616 static int
  617 biba_externalize_label(struct label *label, char *element_name,
  618     struct sbuf *sb, int *claimed)
  619 {
  620         struct mac_biba *mb;
  621 
  622         if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0)
  623                 return (0);
  624 
  625         (*claimed)++;
  626 
  627         mb = SLOT(label);
  628         return (biba_to_string(sb, mb));
  629 }
  630 
  631 static int
  632 biba_parse_element(struct mac_biba_element *element, char *string)
  633 {
  634         char *compartment, *end, *grade;
  635         int value;
  636 
  637         if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) {
  638                 element->mbe_type = MAC_BIBA_TYPE_HIGH;
  639                 element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
  640         } else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) {
  641                 element->mbe_type = MAC_BIBA_TYPE_LOW;
  642                 element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
  643         } else if (strcmp(string, "equal") == 0 ||
  644             strcmp(string, "eq") == 0) {
  645                 element->mbe_type = MAC_BIBA_TYPE_EQUAL;
  646                 element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
  647         } else {
  648                 element->mbe_type = MAC_BIBA_TYPE_GRADE;
  649 
  650                 /*
  651                  * Numeric grade piece of the element.
  652                  */
  653                 grade = strsep(&string, ":");
  654                 value = strtol(grade, &end, 10);
  655                 if (end == grade || *end != '\0')
  656                         return (EINVAL);
  657                 if (value < 0 || value > 65535)
  658                         return (EINVAL);
  659                 element->mbe_grade = value;
  660 
  661                 /*
  662                  * Optional compartment piece of the element.  If none are
  663                  * included, we assume that the label has no compartments.
  664                  */
  665                 if (string == NULL)
  666                         return (0);
  667                 if (*string == '\0')
  668                         return (0);
  669 
  670                 while ((compartment = strsep(&string, "+")) != NULL) {
  671                         value = strtol(compartment, &end, 10);
  672                         if (compartment == end || *end != '\0')
  673                                 return (EINVAL);
  674                         if (value < 1 || value > MAC_BIBA_MAX_COMPARTMENTS)
  675                                 return (EINVAL);
  676                         MAC_BIBA_BIT_SET(value, element->mbe_compartments);
  677                 }
  678         }
  679 
  680         return (0);
  681 }
  682 
  683 /*
  684  * Note: destructively consumes the string, make a local copy before calling
  685  * if that's a problem.
  686  */
  687 static int
  688 biba_parse(struct mac_biba *mb, char *string)
  689 {
  690         char *rangehigh, *rangelow, *effective;
  691         int error;
  692 
  693         effective = strsep(&string, "(");
  694         if (*effective == '\0')
  695                 effective = NULL;
  696 
  697         if (string != NULL) {
  698                 rangelow = strsep(&string, "-");
  699                 if (string == NULL)
  700                         return (EINVAL);
  701                 rangehigh = strsep(&string, ")");
  702                 if (string == NULL)
  703                         return (EINVAL);
  704                 if (*string != '\0')
  705                         return (EINVAL);
  706         } else {
  707                 rangelow = NULL;
  708                 rangehigh = NULL;
  709         }
  710 
  711         KASSERT((rangelow != NULL && rangehigh != NULL) ||
  712             (rangelow == NULL && rangehigh == NULL),
  713             ("biba_parse: range mismatch"));
  714 
  715         bzero(mb, sizeof(*mb));
  716         if (effective != NULL) {
  717                 error = biba_parse_element(&mb->mb_effective, effective);
  718                 if (error)
  719                         return (error);
  720                 mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
  721         }
  722 
  723         if (rangelow != NULL) {
  724                 error = biba_parse_element(&mb->mb_rangelow, rangelow);
  725                 if (error)
  726                         return (error);
  727                 error = biba_parse_element(&mb->mb_rangehigh, rangehigh);
  728                 if (error)
  729                         return (error);
  730                 mb->mb_flags |= MAC_BIBA_FLAG_RANGE;
  731         }
  732 
  733         error = biba_valid(mb);
  734         if (error)
  735                 return (error);
  736 
  737         return (0);
  738 }
  739 
  740 static int
  741 biba_internalize_label(struct label *label, char *element_name,
  742     char *element_data, int *claimed)
  743 {
  744         struct mac_biba *mb, mb_temp;
  745         int error;
  746 
  747         if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0)
  748                 return (0);
  749 
  750         (*claimed)++;
  751 
  752         error = biba_parse(&mb_temp, element_data);
  753         if (error)
  754                 return (error);
  755 
  756         mb = SLOT(label);
  757         *mb = mb_temp;
  758 
  759         return (0);
  760 }
  761 
  762 static void
  763 biba_copy_label(struct label *src, struct label *dest)
  764 {
  765 
  766         *SLOT(dest) = *SLOT(src);
  767 }
  768 
  769 /*
  770  * Object-specific entry point implementations are sorted alphabetically by
  771  * object type name and then by operation.
  772  */
  773 static int
  774 biba_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel,
  775     struct ifnet *ifp, struct label *ifplabel)
  776 {
  777         struct mac_biba *a, *b;
  778 
  779         if (!biba_enabled)
  780                 return (0);
  781 
  782         a = SLOT(dlabel);
  783         b = SLOT(ifplabel);
  784 
  785         if (biba_equal_effective(a, b))
  786                 return (0);
  787         return (EACCES);
  788 }
  789 
  790 static void
  791 biba_bpfdesc_create(struct ucred *cred, struct bpf_d *d,
  792     struct label *dlabel)
  793 {
  794         struct mac_biba *source, *dest;
  795 
  796         source = SLOT(cred->cr_label);
  797         dest = SLOT(dlabel);
  798 
  799         biba_copy_effective(source, dest);
  800 }
  801 
  802 static void
  803 biba_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel,
  804     struct mbuf *m, struct label *mlabel)
  805 {
  806         struct mac_biba *source, *dest;
  807 
  808         source = SLOT(dlabel);
  809         dest = SLOT(mlabel);
  810 
  811         biba_copy_effective(source, dest);
  812 }
  813 
  814 static void
  815 biba_cred_associate_nfsd(struct ucred *cred)
  816 {
  817         struct mac_biba *label;
  818 
  819         label = SLOT(cred->cr_label);
  820         biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL);
  821         biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH,
  822             0, NULL);
  823 }
  824 
  825 static int
  826 biba_cred_check_relabel(struct ucred *cred, struct label *newlabel)
  827 {
  828         struct mac_biba *subj, *new;
  829         int error;
  830 
  831         subj = SLOT(cred->cr_label);
  832         new = SLOT(newlabel);
  833 
  834         /*
  835          * If there is a Biba label update for the credential, it may
  836          * be an update of the effective, range, or both.
  837          */
  838         error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH);
  839         if (error)
  840                 return (error);
  841 
  842         /*
  843          * If the Biba label is to be changed, authorize as appropriate.
  844          */
  845         if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) {
  846                 /*
  847                  * If the change request modifies both the Biba label
  848                  * effective and range, check that the new effective will be
  849                  * in the new range.
  850                  */
  851                 if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) ==
  852                     MAC_BIBA_FLAGS_BOTH &&
  853                     !biba_effective_in_range(new, new))
  854                         return (EINVAL);
  855 
  856                 /*
  857                  * To change the Biba effective label on a credential, the
  858                  * new effective label must be in the current range.
  859                  */
  860                 if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE &&
  861                     !biba_effective_in_range(new, subj))
  862                         return (EPERM);
  863 
  864                 /*
  865                  * To change the Biba range on a credential, the new range
  866                  * label must be in the current range.
  867                  */
  868                 if (new->mb_flags & MAC_BIBA_FLAG_RANGE &&
  869                     !biba_range_in_range(new, subj))
  870                         return (EPERM);
  871 
  872                 /*
  873                  * To have EQUAL in any component of the new credential Biba
  874                  * label, the subject must already have EQUAL in their label.
  875                  */
  876                 if (biba_contains_equal(new)) {
  877                         error = biba_subject_privileged(subj);
  878                         if (error)
  879                                 return (error);
  880                 }
  881         }
  882 
  883         return (0);
  884 }
  885 
  886 static int
  887 biba_cred_check_visible(struct ucred *u1, struct ucred *u2)
  888 {
  889         struct mac_biba *subj, *obj;
  890 
  891         if (!biba_enabled)
  892                 return (0);
  893 
  894         subj = SLOT(u1->cr_label);
  895         obj = SLOT(u2->cr_label);
  896 
  897         /* XXX: range */
  898         if (!biba_dominate_effective(obj, subj))
  899                 return (ESRCH);
  900 
  901         return (0);
  902 }
  903 
  904 static void
  905 biba_cred_create_init(struct ucred *cred)
  906 {
  907         struct mac_biba *dest;
  908 
  909         dest = SLOT(cred->cr_label);
  910 
  911         biba_set_effective(dest, MAC_BIBA_TYPE_HIGH, 0, NULL);
  912         biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH,
  913             0, NULL);
  914 }
  915 
  916 static void
  917 biba_cred_create_swapper(struct ucred *cred)
  918 {
  919         struct mac_biba *dest;
  920 
  921         dest = SLOT(cred->cr_label);
  922 
  923         biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
  924         biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH,
  925             0, NULL);
  926 }
  927 
  928 static void
  929 biba_cred_relabel(struct ucred *cred, struct label *newlabel)
  930 {
  931         struct mac_biba *source, *dest;
  932 
  933         source = SLOT(newlabel);
  934         dest = SLOT(cred->cr_label);
  935 
  936         biba_copy(source, dest);
  937 }
  938 
  939 static void
  940 biba_devfs_create_device(struct ucred *cred, struct mount *mp,
  941     struct cdev *dev, struct devfs_dirent *de, struct label *delabel)
  942 {
  943         struct mac_biba *mb;
  944         const char *dn;
  945         int biba_type;
  946 
  947         mb = SLOT(delabel);
  948         dn = devtoname(dev);
  949         if (strcmp(dn, "null") == 0 ||
  950             strcmp(dn, "zero") == 0 ||
  951             strcmp(dn, "random") == 0 ||
  952             strncmp(dn, "fd/", strlen("fd/")) == 0)
  953                 biba_type = MAC_BIBA_TYPE_EQUAL;
  954         else if (ptys_equal &&
  955             (strncmp(dn, "ttyp", strlen("ttyp")) == 0 ||
  956             strncmp(dn, "pts/", strlen("pts/")) == 0 ||
  957             strncmp(dn, "ptyp", strlen("ptyp")) == 0))
  958                 biba_type = MAC_BIBA_TYPE_EQUAL;
  959         else
  960                 biba_type = MAC_BIBA_TYPE_HIGH;
  961         biba_set_effective(mb, biba_type, 0, NULL);
  962 }
  963 
  964 static void
  965 biba_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen,
  966     struct devfs_dirent *de, struct label *delabel)
  967 {
  968         struct mac_biba *mb;
  969 
  970         mb = SLOT(delabel);
  971 
  972         biba_set_effective(mb, MAC_BIBA_TYPE_HIGH, 0, NULL);
  973 }
  974 
  975 static void
  976 biba_devfs_create_symlink(struct ucred *cred, struct mount *mp,
  977     struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de,
  978     struct label *delabel)
  979 {
  980         struct mac_biba *source, *dest;
  981 
  982         source = SLOT(cred->cr_label);
  983         dest = SLOT(delabel);
  984 
  985         biba_copy_effective(source, dest);
  986 }
  987 
  988 static void
  989 biba_devfs_update(struct mount *mp, struct devfs_dirent *de,
  990     struct label *delabel, struct vnode *vp, struct label *vplabel)
  991 {
  992         struct mac_biba *source, *dest;
  993 
  994         source = SLOT(vplabel);
  995         dest = SLOT(delabel);
  996 
  997         biba_copy(source, dest);
  998 }
  999 
 1000 static void
 1001 biba_devfs_vnode_associate(struct mount *mp, struct label *mntlabel,
 1002     struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
 1003     struct label *vplabel)
 1004 {
 1005         struct mac_biba *source, *dest;
 1006 
 1007         source = SLOT(delabel);
 1008         dest = SLOT(vplabel);
 1009 
 1010         biba_copy_effective(source, dest);
 1011 }
 1012 
 1013 static int
 1014 biba_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp,
 1015     struct label *ifplabel, struct label *newlabel)
 1016 {
 1017         struct mac_biba *subj, *new;
 1018         int error;
 1019 
 1020         subj = SLOT(cred->cr_label);
 1021         new = SLOT(newlabel);
 1022 
 1023         /*
 1024          * If there is a Biba label update for the interface, it may be an
 1025          * update of the effective, range, or both.
 1026          */
 1027         error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH);
 1028         if (error)
 1029                 return (error);
 1030 
 1031         /*
 1032          * Relabling network interfaces requires Biba privilege.
 1033          */
 1034         error = biba_subject_privileged(subj);
 1035         if (error)
 1036                 return (error);
 1037 
 1038         return (0);
 1039 }
 1040 
 1041 static int
 1042 biba_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel,
 1043     struct mbuf *m, struct label *mlabel)
 1044 {
 1045         struct mac_biba *p, *i;
 1046 
 1047         if (!biba_enabled)
 1048                 return (0);
 1049 
 1050         p = SLOT(mlabel);
 1051         i = SLOT(ifplabel);
 1052 
 1053         return (biba_effective_in_range(p, i) ? 0 : EACCES);
 1054 }
 1055 
 1056 static void
 1057 biba_ifnet_create(struct ifnet *ifp, struct label *ifplabel)
 1058 {
 1059         char tifname[IFNAMSIZ], *p, *q;
 1060         char tiflist[sizeof(trusted_interfaces)];
 1061         struct mac_biba *dest;
 1062         int len, type;
 1063 
 1064         dest = SLOT(ifplabel);
 1065 
 1066         if (ifp->if_type == IFT_LOOP || interfaces_equal != 0) {
 1067                 type = MAC_BIBA_TYPE_EQUAL;
 1068                 goto set;
 1069         }
 1070 
 1071         if (trust_all_interfaces) {
 1072                 type = MAC_BIBA_TYPE_HIGH;
 1073                 goto set;
 1074         }
 1075 
 1076         type = MAC_BIBA_TYPE_LOW;
 1077 
 1078         if (trusted_interfaces[0] == '\0' ||
 1079             !strvalid(trusted_interfaces, sizeof(trusted_interfaces)))
 1080                 goto set;
 1081 
 1082         bzero(tiflist, sizeof(tiflist));
 1083         for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++)
 1084                 if(*p != ' ' && *p != '\t')
 1085                         *q = *p;
 1086 
 1087         for (p = q = tiflist;; p++) {
 1088                 if (*p == ',' || *p == '\0') {
 1089                         len = p - q;
 1090                         if (len < IFNAMSIZ) {
 1091                                 bzero(tifname, sizeof(tifname));
 1092                                 bcopy(q, tifname, len);
 1093                                 if (strcmp(tifname, ifp->if_xname) == 0) {
 1094                                         type = MAC_BIBA_TYPE_HIGH;
 1095                                         break;
 1096                                 }
 1097                         } else {
 1098                                 *p = '\0';
 1099                                 printf("mac_biba warning: interface name "
 1100                                     "\"%s\" is too long (must be < %d)\n",
 1101                                     q, IFNAMSIZ);
 1102                         }
 1103                         if (*p == '\0')
 1104                                 break;
 1105                         q = p + 1;
 1106                 }
 1107         }
 1108 set:
 1109         biba_set_effective(dest, type, 0, NULL);
 1110         biba_set_range(dest, type, 0, NULL, type, 0, NULL);
 1111 }
 1112 
 1113 static void
 1114 biba_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel,
 1115     struct mbuf *m, struct label *mlabel)
 1116 {
 1117         struct mac_biba *source, *dest;
 1118 
 1119         source = SLOT(ifplabel);
 1120         dest = SLOT(mlabel);
 1121 
 1122         biba_copy_effective(source, dest);
 1123 }
 1124 
 1125 static void
 1126 biba_ifnet_relabel(struct ucred *cred, struct ifnet *ifp,
 1127     struct label *ifplabel, struct label *newlabel)
 1128 {
 1129         struct mac_biba *source, *dest;
 1130 
 1131         source = SLOT(newlabel);
 1132         dest = SLOT(ifplabel);
 1133 
 1134         biba_copy(source, dest);
 1135 }
 1136 
 1137 static int
 1138 biba_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel,
 1139     struct mbuf *m, struct label *mlabel)
 1140 {
 1141         struct mac_biba *p, *i;
 1142 
 1143         if (!biba_enabled)
 1144                 return (0);
 1145 
 1146         p = SLOT(mlabel);
 1147         i = SLOT(inplabel);
 1148 
 1149         return (biba_equal_effective(p, i) ? 0 : EACCES);
 1150 }
 1151 
 1152 static int
 1153 biba_inpcb_check_visible(struct ucred *cred, struct inpcb *inp,
 1154     struct label *inplabel)
 1155 {
 1156         struct mac_biba *subj, *obj;
 1157 
 1158         if (!biba_enabled)
 1159                 return (0);
 1160 
 1161         subj = SLOT(cred->cr_label);
 1162         obj = SLOT(inplabel);
 1163 
 1164         if (!biba_dominate_effective(obj, subj))
 1165                 return (ENOENT);
 1166 
 1167         return (0);
 1168 }
 1169 
 1170 static void
 1171 biba_inpcb_create(struct socket *so, struct label *solabel,
 1172     struct inpcb *inp, struct label *inplabel)
 1173 {
 1174         struct mac_biba *source, *dest;
 1175 
 1176         source = SLOT(solabel);
 1177         dest = SLOT(inplabel);
 1178 
 1179         SOCK_LOCK(so);
 1180         biba_copy_effective(source, dest);
 1181         SOCK_UNLOCK(so);
 1182 }
 1183 
 1184 static void
 1185 biba_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel,
 1186     struct mbuf *m, struct label *mlabel)
 1187 {
 1188         struct mac_biba *source, *dest;
 1189 
 1190         source = SLOT(inplabel);
 1191         dest = SLOT(mlabel);
 1192 
 1193         biba_copy_effective(source, dest);
 1194 }
 1195 
 1196 static void
 1197 biba_inpcb_sosetlabel(struct socket *so, struct label *solabel,
 1198     struct inpcb *inp, struct label *inplabel)
 1199 {
 1200         struct mac_biba *source, *dest;
 1201 
 1202         SOCK_LOCK_ASSERT(so);
 1203 
 1204         source = SLOT(solabel);
 1205         dest = SLOT(inplabel);
 1206 
 1207         biba_copy(source, dest);
 1208 }
 1209 
 1210 static void
 1211 biba_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
 1212     struct label *q6label)
 1213 {
 1214         struct mac_biba *source, *dest;
 1215 
 1216         source = SLOT(mlabel);
 1217         dest = SLOT(q6label);
 1218 
 1219         biba_copy_effective(source, dest);
 1220 }
 1221 
 1222 static int
 1223 biba_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
 1224     struct label *q6label)
 1225 {
 1226         struct mac_biba *a, *b;
 1227 
 1228         a = SLOT(q6label);
 1229         b = SLOT(mlabel);
 1230 
 1231         return (biba_equal_effective(a, b));
 1232 }
 1233 
 1234 static void
 1235 biba_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m,
 1236     struct label *mlabel)
 1237 {
 1238         struct mac_biba *source, *dest;
 1239 
 1240         source = SLOT(q6label);
 1241         dest = SLOT(mlabel);
 1242 
 1243         /* Just use the head, since we require them all to match. */
 1244         biba_copy_effective(source, dest);
 1245 }
 1246 
 1247 static void
 1248 biba_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
 1249     struct label *q6label)
 1250 {
 1251 
 1252         /* NOOP: we only accept matching labels, so no need to update */
 1253 }
 1254 
 1255 static void
 1256 biba_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q,
 1257     struct label *qlabel)
 1258 {
 1259         struct mac_biba *source, *dest;
 1260 
 1261         source = SLOT(mlabel);
 1262         dest = SLOT(qlabel);
 1263 
 1264         biba_copy_effective(source, dest);
 1265 }
 1266 
 1267 static int
 1268 biba_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q,
 1269     struct label *qlabel)
 1270 {
 1271         struct mac_biba *a, *b;
 1272 
 1273         a = SLOT(qlabel);
 1274         b = SLOT(mlabel);
 1275 
 1276         return (biba_equal_effective(a, b));
 1277 }
 1278 
 1279 static void
 1280 biba_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m,
 1281     struct label *mlabel)
 1282 {
 1283         struct mac_biba *source, *dest;
 1284 
 1285         source = SLOT(qlabel);
 1286         dest = SLOT(mlabel);
 1287 
 1288         /* Just use the head, since we require them all to match. */
 1289         biba_copy_effective(source, dest);
 1290 }
 1291 
 1292 static void
 1293 biba_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q,
 1294     struct label *qlabel)
 1295 {
 1296 
 1297         /* NOOP: we only accept matching labels, so no need to update */
 1298 }
 1299 
 1300 static int
 1301 biba_kld_check_load(struct ucred *cred, struct vnode *vp,
 1302     struct label *vplabel)
 1303 {
 1304         struct mac_biba *subj, *obj;
 1305         int error;
 1306 
 1307         if (!biba_enabled)
 1308                 return (0);
 1309 
 1310         subj = SLOT(cred->cr_label);
 1311 
 1312         error = biba_subject_privileged(subj);
 1313         if (error)
 1314                 return (error);
 1315 
 1316         obj = SLOT(vplabel);
 1317         if (!biba_high_effective(obj))
 1318                 return (EACCES);
 1319 
 1320         return (0);
 1321 }
 1322 
 1323 static int
 1324 biba_mount_check_stat(struct ucred *cred, struct mount *mp,
 1325     struct label *mplabel)
 1326 {
 1327         struct mac_biba *subj, *obj;
 1328 
 1329         if (!biba_enabled)
 1330                 return (0);
 1331 
 1332         subj = SLOT(cred->cr_label);
 1333         obj = SLOT(mplabel);
 1334 
 1335         if (!biba_dominate_effective(obj, subj))
 1336                 return (EACCES);
 1337 
 1338         return (0);
 1339 }
 1340 
 1341 static void
 1342 biba_mount_create(struct ucred *cred, struct mount *mp,
 1343     struct label *mplabel)
 1344 {
 1345         struct mac_biba *source, *dest;
 1346 
 1347         source = SLOT(cred->cr_label);
 1348         dest = SLOT(mplabel);
 1349 
 1350         biba_copy_effective(source, dest);
 1351 }
 1352 
 1353 static void
 1354 biba_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel,
 1355     struct mbuf *m, struct label *mlabel)
 1356 {
 1357         struct mac_biba *dest;
 1358 
 1359         dest = SLOT(mlabel);
 1360 
 1361         biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
 1362 }
 1363 
 1364 static void
 1365 biba_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel,
 1366     struct mbuf *msend, struct label *msendlabel)
 1367 {
 1368         struct mac_biba *source, *dest;
 1369 
 1370         source = SLOT(mrecvlabel);
 1371         dest = SLOT(msendlabel);
 1372 
 1373         biba_copy_effective(source, dest);
 1374 }
 1375 
 1376 static void
 1377 biba_netinet_firewall_send(struct mbuf *m, struct label *mlabel)
 1378 {
 1379         struct mac_biba *dest;
 1380 
 1381         dest = SLOT(mlabel);
 1382 
 1383         /* XXX: where is the label for the firewall really coming from? */
 1384         biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
 1385 }
 1386 
 1387 static void
 1388 biba_netinet_fragment(struct mbuf *m, struct label *mlabel,
 1389     struct mbuf *frag, struct label *fraglabel)
 1390 {
 1391         struct mac_biba *source, *dest;
 1392 
 1393         source = SLOT(mlabel);
 1394         dest = SLOT(fraglabel);
 1395 
 1396         biba_copy_effective(source, dest);
 1397 }
 1398 
 1399 static void
 1400 biba_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel,
 1401     struct mbuf *msend, struct label *msendlabel)
 1402 {
 1403         struct mac_biba *source, *dest;
 1404 
 1405         source = SLOT(mrecvlabel);
 1406         dest = SLOT(msendlabel);
 1407 
 1408         biba_copy_effective(source, dest);
 1409 }
 1410 
 1411 static void
 1412 biba_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel,
 1413     struct mbuf *m, struct label *mlabel)
 1414 {
 1415         struct mac_biba *dest;
 1416 
 1417         dest = SLOT(mlabel);
 1418 
 1419         biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
 1420 }
 1421 
 1422 static void
 1423 biba_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel,
 1424     struct mbuf *m, struct label *mlabel)
 1425 {
 1426         struct mac_biba *dest;
 1427 
 1428         dest = SLOT(mlabel);
 1429 
 1430         biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
 1431 }
 1432 
 1433 static int
 1434 biba_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
 1435     struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
 1436 {
 1437 
 1438         if(!biba_enabled)
 1439                 return (0);
 1440 
 1441         /* XXX: This will be implemented soon... */
 1442 
 1443         return (0);
 1444 }
 1445 
 1446 static int
 1447 biba_pipe_check_poll(struct ucred *cred, struct pipepair *pp,
 1448     struct label *pplabel)
 1449 {
 1450         struct mac_biba *subj, *obj;
 1451 
 1452         if (!biba_enabled)
 1453                 return (0);
 1454 
 1455         subj = SLOT(cred->cr_label);
 1456         obj = SLOT(pplabel);
 1457 
 1458         if (!biba_dominate_effective(obj, subj))
 1459                 return (EACCES);
 1460 
 1461         return (0);
 1462 }
 1463 
 1464 static int
 1465 biba_pipe_check_read(struct ucred *cred, struct pipepair *pp,
 1466     struct label *pplabel)
 1467 {
 1468         struct mac_biba *subj, *obj;
 1469 
 1470         if (!biba_enabled)
 1471                 return (0);
 1472 
 1473         subj = SLOT(cred->cr_label);
 1474         obj = SLOT(pplabel);
 1475 
 1476         if (!biba_dominate_effective(obj, subj))
 1477                 return (EACCES);
 1478 
 1479         return (0);
 1480 }
 1481 
 1482 static int
 1483 biba_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
 1484     struct label *pplabel, struct label *newlabel)
 1485 {
 1486         struct mac_biba *subj, *obj, *new;
 1487         int error;
 1488 
 1489         new = SLOT(newlabel);
 1490         subj = SLOT(cred->cr_label);
 1491         obj = SLOT(pplabel);
 1492 
 1493         /*
 1494          * If there is a Biba label update for a pipe, it must be a effective
 1495          * update.
 1496          */
 1497         error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
 1498         if (error)
 1499                 return (error);
 1500 
 1501         /*
 1502          * To perform a relabel of a pipe (Biba label or not), Biba must
 1503          * authorize the relabel.
 1504          */
 1505         if (!biba_effective_in_range(obj, subj))
 1506                 return (EPERM);
 1507 
 1508         /*
 1509          * If the Biba label is to be changed, authorize as appropriate.
 1510          */
 1511         if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
 1512                 /*
 1513                  * To change the Biba label on a pipe, the new pipe label
 1514                  * must be in the subject range.
 1515                  */
 1516                 if (!biba_effective_in_range(new, subj))
 1517                         return (EPERM);
 1518 
 1519                 /*
 1520                  * To change the Biba label on a pipe to be EQUAL, the
 1521                  * subject must have appropriate privilege.
 1522                  */
 1523                 if (biba_contains_equal(new)) {
 1524                         error = biba_subject_privileged(subj);
 1525                         if (error)
 1526                                 return (error);
 1527                 }
 1528         }
 1529 
 1530         return (0);
 1531 }
 1532 
 1533 static int
 1534 biba_pipe_check_stat(struct ucred *cred, struct pipepair *pp,
 1535     struct label *pplabel)
 1536 {
 1537         struct mac_biba *subj, *obj;
 1538 
 1539         if (!biba_enabled)
 1540                 return (0);
 1541 
 1542         subj = SLOT(cred->cr_label);
 1543         obj = SLOT(pplabel);
 1544 
 1545         if (!biba_dominate_effective(obj, subj))
 1546                 return (EACCES);
 1547 
 1548         return (0);
 1549 }
 1550 
 1551 static int
 1552 biba_pipe_check_write(struct ucred *cred, struct pipepair *pp,
 1553     struct label *pplabel)
 1554 {
 1555         struct mac_biba *subj, *obj;
 1556 
 1557         if (!biba_enabled)
 1558                 return (0);
 1559 
 1560         subj = SLOT(cred->cr_label);
 1561         obj = SLOT(pplabel);
 1562 
 1563         if (!biba_dominate_effective(subj, obj))
 1564                 return (EACCES);
 1565 
 1566         return (0);
 1567 }
 1568 
 1569 static void
 1570 biba_pipe_create(struct ucred *cred, struct pipepair *pp,
 1571     struct label *pplabel)
 1572 {
 1573         struct mac_biba *source, *dest;
 1574 
 1575         source = SLOT(cred->cr_label);
 1576         dest = SLOT(pplabel);
 1577 
 1578         biba_copy_effective(source, dest);
 1579 }
 1580 
 1581 static void
 1582 biba_pipe_relabel(struct ucred *cred, struct pipepair *pp,
 1583     struct label *pplabel, struct label *newlabel)
 1584 {
 1585         struct mac_biba *source, *dest;
 1586 
 1587         source = SLOT(newlabel);
 1588         dest = SLOT(pplabel);
 1589 
 1590         biba_copy(source, dest);
 1591 }
 1592 
 1593 static int
 1594 biba_posixsem_check_openunlink(struct ucred *cred, struct ksem *ks,
 1595     struct label *kslabel)
 1596 {
 1597         struct mac_biba *subj, *obj;
 1598 
 1599         if (!biba_enabled)
 1600                 return (0);
 1601 
 1602         subj = SLOT(cred->cr_label);
 1603         obj = SLOT(kslabel);
 1604 
 1605         if (!biba_dominate_effective(subj, obj))
 1606                 return (EACCES);
 1607 
 1608         return (0);
 1609 }
 1610 
 1611 static int
 1612 biba_posixsem_check_setmode(struct ucred *cred, struct ksem *ks,
 1613     struct label *kslabel, mode_t mode)
 1614 {
 1615         struct mac_biba *subj, *obj;
 1616 
 1617         if (!biba_enabled)
 1618                 return (0);
 1619 
 1620         subj = SLOT(cred->cr_label);
 1621         obj = SLOT(kslabel);
 1622 
 1623         if (!biba_dominate_effective(subj, obj))
 1624                 return (EACCES);
 1625 
 1626         return (0);
 1627 }
 1628 
 1629 static int
 1630 biba_posixsem_check_setowner(struct ucred *cred, struct ksem *ks,
 1631     struct label *kslabel, uid_t uid, gid_t gid)
 1632 {
 1633         struct mac_biba *subj, *obj;
 1634 
 1635         if (!biba_enabled)
 1636                 return (0);
 1637 
 1638         subj = SLOT(cred->cr_label);
 1639         obj = SLOT(kslabel);
 1640 
 1641         if (!biba_dominate_effective(subj, obj))
 1642                 return (EACCES);
 1643 
 1644         return (0);
 1645 }
 1646 
 1647 static int
 1648 biba_posixsem_check_write(struct ucred *active_cred, struct ucred *file_cred,
 1649     struct ksem *ks, struct label *kslabel)
 1650 {
 1651         struct mac_biba *subj, *obj;
 1652 
 1653         if (!biba_enabled)
 1654                 return (0);
 1655 
 1656         subj = SLOT(active_cred->cr_label);
 1657         obj = SLOT(kslabel);
 1658 
 1659         if (!biba_dominate_effective(subj, obj))
 1660                 return (EACCES);
 1661 
 1662         return (0);
 1663 }
 1664 
 1665 static int
 1666 biba_posixsem_check_rdonly(struct ucred *active_cred, struct ucred *file_cred,
 1667     struct ksem *ks, struct label *kslabel)
 1668 {
 1669         struct mac_biba *subj, *obj;
 1670 
 1671         if (!biba_enabled)
 1672                 return (0);
 1673 
 1674         subj = SLOT(active_cred->cr_label);
 1675         obj = SLOT(kslabel);
 1676 
 1677         if (!biba_dominate_effective(obj, subj))
 1678                 return (EACCES);
 1679 
 1680         return (0);
 1681 }
 1682 
 1683 static void
 1684 biba_posixsem_create(struct ucred *cred, struct ksem *ks,
 1685     struct label *kslabel)
 1686 {
 1687         struct mac_biba *source, *dest;
 1688 
 1689         source = SLOT(cred->cr_label);
 1690         dest = SLOT(kslabel);
 1691 
 1692         biba_copy_effective(source, dest);
 1693 }
 1694 
 1695 static int
 1696 biba_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd,
 1697     struct label *shmlabel, int prot, int flags)
 1698 {
 1699         struct mac_biba *subj, *obj;
 1700 
 1701         if (!biba_enabled || !revocation_enabled)
 1702                 return (0);
 1703 
 1704         subj = SLOT(cred->cr_label);
 1705         obj = SLOT(shmlabel);
 1706 
 1707         if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
 1708                 if (!biba_dominate_effective(obj, subj))
 1709                         return (EACCES);
 1710         }
 1711         if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
 1712                 if (!biba_dominate_effective(subj, obj))
 1713                         return (EACCES);
 1714         }
 1715 
 1716         return (0);
 1717 }
 1718 
 1719 static int
 1720 biba_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd,
 1721     struct label *shmlabel, accmode_t accmode)
 1722 {
 1723         struct mac_biba *subj, *obj;
 1724 
 1725         if (!biba_enabled)
 1726                 return (0);
 1727 
 1728         subj = SLOT(cred->cr_label);
 1729         obj = SLOT(shmlabel);
 1730 
 1731         if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) {
 1732                 if (!biba_dominate_effective(obj, subj))
 1733                         return (EACCES);
 1734         }
 1735         if (accmode & VMODIFY_PERMS) {
 1736                 if (!biba_dominate_effective(subj, obj))
 1737                         return (EACCES);
 1738         }
 1739 
 1740         return (0);
 1741 }
 1742 
 1743 static int
 1744 biba_posixshm_check_read(struct ucred *active_cred, struct ucred *file_cred,
 1745     struct shmfd *vp, struct label *shmlabel)
 1746 {
 1747         struct mac_biba *subj, *obj;
 1748 
 1749         if (!biba_enabled || !revocation_enabled)
 1750                 return (0);
 1751 
 1752         subj = SLOT(active_cred->cr_label);
 1753         obj = SLOT(shmlabel);
 1754 
 1755         if (!biba_dominate_effective(obj, subj))
 1756                 return (EACCES);
 1757 
 1758         return (0);
 1759 }
 1760 
 1761 static int
 1762 biba_posixshm_check_setmode(struct ucred *cred, struct shmfd *shmfd,
 1763     struct label *shmlabel, mode_t mode)
 1764 {
 1765         struct mac_biba *subj, *obj;
 1766 
 1767         if (!biba_enabled)
 1768                 return (0);
 1769 
 1770         subj = SLOT(cred->cr_label);
 1771         obj = SLOT(shmlabel);
 1772 
 1773         if (!biba_dominate_effective(subj, obj))
 1774                 return (EACCES);
 1775 
 1776         return (0);
 1777 }
 1778 
 1779 static int
 1780 biba_posixshm_check_setowner(struct ucred *cred, struct shmfd *shmfd,
 1781     struct label *shmlabel, uid_t uid, gid_t gid)
 1782 {
 1783         struct mac_biba *subj, *obj;
 1784 
 1785         if (!biba_enabled)
 1786                 return (0);
 1787 
 1788         subj = SLOT(cred->cr_label);
 1789         obj = SLOT(shmlabel);
 1790 
 1791         if (!biba_dominate_effective(subj, obj))
 1792                 return (EACCES);
 1793 
 1794         return (0);
 1795 }
 1796 
 1797 static int
 1798 biba_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred,
 1799     struct shmfd *shmfd, struct label *shmlabel)
 1800 {
 1801         struct mac_biba *subj, *obj;
 1802 
 1803         if (!biba_enabled)
 1804                 return (0);
 1805 
 1806         subj = SLOT(active_cred->cr_label);
 1807         obj = SLOT(shmlabel);
 1808 
 1809         if (!biba_dominate_effective(obj, subj))
 1810                 return (EACCES);
 1811 
 1812         return (0);
 1813 }
 1814 
 1815 static int
 1816 biba_posixshm_check_truncate(struct ucred *active_cred,
 1817     struct ucred *file_cred, struct shmfd *shmfd, struct label *shmlabel)
 1818 {
 1819         struct mac_biba *subj, *obj;
 1820 
 1821         if (!biba_enabled)
 1822                 return (0);
 1823 
 1824         subj = SLOT(active_cred->cr_label);
 1825         obj = SLOT(shmlabel);
 1826 
 1827         if (!biba_dominate_effective(subj, obj))
 1828                 return (EACCES);
 1829 
 1830         return (0);
 1831 }
 1832 
 1833 static int
 1834 biba_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd,
 1835     struct label *shmlabel)
 1836 {
 1837         struct mac_biba *subj, *obj;
 1838 
 1839         if (!biba_enabled)
 1840                 return (0);
 1841 
 1842         subj = SLOT(cred->cr_label);
 1843         obj = SLOT(shmlabel);
 1844 
 1845         if (!biba_dominate_effective(subj, obj))
 1846                 return (EACCES);
 1847     
 1848         return (0);
 1849 }
 1850 
 1851 static int
 1852 biba_posixshm_check_write(struct ucred *active_cred, struct ucred *file_cred,
 1853     struct shmfd *vp, struct label *shmlabel)
 1854 {
 1855         struct mac_biba *subj, *obj;
 1856 
 1857         if (!biba_enabled || !revocation_enabled)
 1858                 return (0);
 1859 
 1860         subj = SLOT(active_cred->cr_label);
 1861         obj = SLOT(shmlabel);
 1862 
 1863         if (!biba_dominate_effective(obj, subj))
 1864                 return (EACCES);
 1865 
 1866         return (0);
 1867 }
 1868 
 1869 static void
 1870 biba_posixshm_create(struct ucred *cred, struct shmfd *shmfd,
 1871     struct label *shmlabel)
 1872 {
 1873         struct mac_biba *source, *dest;
 1874 
 1875         source = SLOT(cred->cr_label);
 1876         dest = SLOT(shmlabel);
 1877 
 1878         biba_copy_effective(source, dest);
 1879 }
 1880 
 1881 /*
 1882  * Some system privileges are allowed regardless of integrity grade; others
 1883  * are allowed only when running with privilege with respect to the Biba
 1884  * policy as they might otherwise allow bypassing of the integrity policy.
 1885  */
 1886 static int
 1887 biba_priv_check(struct ucred *cred, int priv)
 1888 {
 1889         struct mac_biba *subj;
 1890         int error;
 1891 
 1892         if (!biba_enabled)
 1893                 return (0);
 1894 
 1895         /*
 1896          * Exempt only specific privileges from the Biba integrity policy.
 1897          */
 1898         switch (priv) {
 1899         case PRIV_KTRACE:
 1900         case PRIV_MSGBUF:
 1901 
 1902         /*
 1903          * Allow processes to manipulate basic process audit properties, and
 1904          * to submit audit records.
 1905          */
 1906         case PRIV_AUDIT_GETAUDIT:
 1907         case PRIV_AUDIT_SETAUDIT:
 1908         case PRIV_AUDIT_SUBMIT:
 1909 
 1910         /*
 1911          * Allow processes to manipulate their regular UNIX credentials.
 1912          */
 1913         case PRIV_CRED_SETUID:
 1914         case PRIV_CRED_SETEUID:
 1915         case PRIV_CRED_SETGID:
 1916         case PRIV_CRED_SETEGID:
 1917         case PRIV_CRED_SETGROUPS:
 1918         case PRIV_CRED_SETREUID:
 1919         case PRIV_CRED_SETREGID:
 1920         case PRIV_CRED_SETRESUID:
 1921         case PRIV_CRED_SETRESGID:
 1922 
 1923         /*
 1924          * Allow processes to perform system monitoring.
 1925          */
 1926         case PRIV_SEEOTHERGIDS:
 1927         case PRIV_SEEOTHERUIDS:
 1928                 break;
 1929 
 1930         /*
 1931          * Allow access to general process debugging facilities.  We
 1932          * separately control debugging based on MAC label.
 1933          */
 1934         case PRIV_DEBUG_DIFFCRED:
 1935         case PRIV_DEBUG_SUGID:
 1936         case PRIV_DEBUG_UNPRIV:
 1937 
 1938         /*
 1939          * Allow manipulating jails.
 1940          */
 1941         case PRIV_JAIL_ATTACH:
 1942 
 1943         /*
 1944          * Allow privilege with respect to the Partition policy, but not the
 1945          * Privs policy.
 1946          */
 1947         case PRIV_MAC_PARTITION:
 1948 
 1949         /*
 1950          * Allow privilege with respect to process resource limits and login
 1951          * context.
 1952          */
 1953         case PRIV_PROC_LIMIT:
 1954         case PRIV_PROC_SETLOGIN:
 1955         case PRIV_PROC_SETRLIMIT:
 1956 
 1957         /*
 1958          * Allow System V and POSIX IPC privileges.
 1959          */
 1960         case PRIV_IPC_READ:
 1961         case PRIV_IPC_WRITE:
 1962         case PRIV_IPC_ADMIN:
 1963         case PRIV_IPC_MSGSIZE:
 1964         case PRIV_MQ_ADMIN:
 1965 
 1966         /*
 1967          * Allow certain scheduler manipulations -- possibly this should be
 1968          * controlled by more fine-grained policy, as potentially low
 1969          * integrity processes can deny CPU to higher integrity ones.
 1970          */
 1971         case PRIV_SCHED_DIFFCRED:
 1972         case PRIV_SCHED_SETPRIORITY:
 1973         case PRIV_SCHED_RTPRIO:
 1974         case PRIV_SCHED_SETPOLICY:
 1975         case PRIV_SCHED_SET:
 1976         case PRIV_SCHED_SETPARAM:
 1977 
 1978         /*
 1979          * More IPC privileges.
 1980          */
 1981         case PRIV_SEM_WRITE:
 1982 
 1983         /*
 1984          * Allow signaling privileges subject to integrity policy.
 1985          */
 1986         case PRIV_SIGNAL_DIFFCRED:
 1987         case PRIV_SIGNAL_SUGID:
 1988 
 1989         /*
 1990          * Allow access to only limited sysctls from lower integrity levels;
 1991          * piggy-back on the Jail definition.
 1992          */
 1993         case PRIV_SYSCTL_WRITEJAIL:
 1994 
 1995         /*
 1996          * Allow TTY-based privileges, subject to general device access using
 1997          * labels on TTY device nodes, but not console privilege.
 1998          */
 1999         case PRIV_TTY_DRAINWAIT:
 2000         case PRIV_TTY_DTRWAIT:
 2001         case PRIV_TTY_EXCLUSIVE:
 2002         case PRIV_TTY_STI:
 2003         case PRIV_TTY_SETA:
 2004 
 2005         /*
 2006          * Grant most VFS privileges, as almost all are in practice bounded
 2007          * by more specific checks using labels.
 2008          */
 2009         case PRIV_VFS_READ:
 2010         case PRIV_VFS_WRITE:
 2011         case PRIV_VFS_ADMIN:
 2012         case PRIV_VFS_EXEC:
 2013         case PRIV_VFS_LOOKUP:
 2014         case PRIV_VFS_CHFLAGS_DEV:
 2015         case PRIV_VFS_CHOWN:
 2016         case PRIV_VFS_CHROOT:
 2017         case PRIV_VFS_RETAINSUGID:
 2018         case PRIV_VFS_EXCEEDQUOTA:
 2019         case PRIV_VFS_FCHROOT:
 2020         case PRIV_VFS_FHOPEN:
 2021         case PRIV_VFS_FHSTATFS:
 2022         case PRIV_VFS_GENERATION:
 2023         case PRIV_VFS_GETFH:
 2024         case PRIV_VFS_GETQUOTA:
 2025         case PRIV_VFS_LINK:
 2026         case PRIV_VFS_MOUNT:
 2027         case PRIV_VFS_MOUNT_OWNER:
 2028         case PRIV_VFS_MOUNT_PERM:
 2029         case PRIV_VFS_MOUNT_SUIDDIR:
 2030         case PRIV_VFS_MOUNT_NONUSER:
 2031         case PRIV_VFS_SETGID:
 2032         case PRIV_VFS_STICKYFILE:
 2033         case PRIV_VFS_SYSFLAGS:
 2034         case PRIV_VFS_UNMOUNT:
 2035 
 2036         /*
 2037          * Allow VM privileges; it would be nice if these were subject to
 2038          * resource limits.
 2039          */
 2040         case PRIV_VM_MADV_PROTECT:
 2041         case PRIV_VM_MLOCK:
 2042         case PRIV_VM_MUNLOCK:
 2043         case PRIV_VM_SWAP_NOQUOTA:
 2044         case PRIV_VM_SWAP_NORLIMIT:
 2045 
 2046         /*
 2047          * Allow some but not all network privileges.  In general, dont allow
 2048          * reconfiguring the network stack, just normal use.
 2049          */
 2050         case PRIV_NETINET_RESERVEDPORT:
 2051         case PRIV_NETINET_RAW:
 2052         case PRIV_NETINET_REUSEPORT:
 2053                 break;
 2054 
 2055         /*
 2056          * All remaining system privileges are allow only if the process
 2057          * holds privilege with respect to the Biba policy.
 2058          */
 2059         default:
 2060                 subj = SLOT(cred->cr_label);
 2061                 error = biba_subject_privileged(subj);
 2062                 if (error)
 2063                         return (error);
 2064         }
 2065         return (0);
 2066 }
 2067 
 2068 static int
 2069 biba_proc_check_debug(struct ucred *cred, struct proc *p)
 2070 {
 2071         struct mac_biba *subj, *obj;
 2072 
 2073         if (!biba_enabled)
 2074                 return (0);
 2075 
 2076         subj = SLOT(cred->cr_label);
 2077         obj = SLOT(p->p_ucred->cr_label);
 2078 
 2079         /* XXX: range checks */
 2080         if (!biba_dominate_effective(obj, subj))
 2081                 return (ESRCH);
 2082         if (!biba_dominate_effective(subj, obj))
 2083                 return (EACCES);
 2084 
 2085         return (0);
 2086 }
 2087 
 2088 static int
 2089 biba_proc_check_sched(struct ucred *cred, struct proc *p)
 2090 {
 2091         struct mac_biba *subj, *obj;
 2092 
 2093         if (!biba_enabled)
 2094                 return (0);
 2095 
 2096         subj = SLOT(cred->cr_label);
 2097         obj = SLOT(p->p_ucred->cr_label);
 2098 
 2099         /* XXX: range checks */
 2100         if (!biba_dominate_effective(obj, subj))
 2101                 return (ESRCH);
 2102         if (!biba_dominate_effective(subj, obj))
 2103                 return (EACCES);
 2104 
 2105         return (0);
 2106 }
 2107 
 2108 static int
 2109 biba_proc_check_signal(struct ucred *cred, struct proc *p, int signum)
 2110 {
 2111         struct mac_biba *subj, *obj;
 2112 
 2113         if (!biba_enabled)
 2114                 return (0);
 2115 
 2116         subj = SLOT(cred->cr_label);
 2117         obj = SLOT(p->p_ucred->cr_label);
 2118 
 2119         /* XXX: range checks */
 2120         if (!biba_dominate_effective(obj, subj))
 2121                 return (ESRCH);
 2122         if (!biba_dominate_effective(subj, obj))
 2123                 return (EACCES);
 2124 
 2125         return (0);
 2126 }
 2127 
 2128 static int
 2129 biba_socket_check_deliver(struct socket *so, struct label *solabel,
 2130     struct mbuf *m, struct label *mlabel)
 2131 {
 2132         struct mac_biba *p, *s;
 2133         int error;
 2134 
 2135         if (!biba_enabled)
 2136                 return (0);
 2137 
 2138         p = SLOT(mlabel);
 2139         s = SLOT(solabel);
 2140 
 2141         SOCK_LOCK(so);
 2142         error = biba_equal_effective(p, s) ? 0 : EACCES;
 2143         SOCK_UNLOCK(so);
 2144         return (error);
 2145 }
 2146 
 2147 static int
 2148 biba_socket_check_relabel(struct ucred *cred, struct socket *so,
 2149     struct label *solabel, struct label *newlabel)
 2150 {
 2151         struct mac_biba *subj, *obj, *new;
 2152         int error;
 2153 
 2154         SOCK_LOCK_ASSERT(so);
 2155 
 2156         new = SLOT(newlabel);
 2157         subj = SLOT(cred->cr_label);
 2158         obj = SLOT(solabel);
 2159 
 2160         /*
 2161          * If there is a Biba label update for the socket, it may be an
 2162          * update of effective.
 2163          */
 2164         error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
 2165         if (error)
 2166                 return (error);
 2167 
 2168         /*
 2169          * To relabel a socket, the old socket effective must be in the
 2170          * subject range.
 2171          */
 2172         if (!biba_effective_in_range(obj, subj))
 2173                 return (EPERM);
 2174 
 2175         /*
 2176          * If the Biba label is to be changed, authorize as appropriate.
 2177          */
 2178         if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
 2179                 /*
 2180                  * To relabel a socket, the new socket effective must be in
 2181                  * the subject range.
 2182                  */
 2183                 if (!biba_effective_in_range(new, subj))
 2184                         return (EPERM);
 2185 
 2186                 /*
 2187                  * To change the Biba label on the socket to contain EQUAL,
 2188                  * the subject must have appropriate privilege.
 2189                  */
 2190                 if (biba_contains_equal(new)) {
 2191                         error = biba_subject_privileged(subj);
 2192                         if (error)
 2193                                 return (error);
 2194                 }
 2195         }
 2196 
 2197         return (0);
 2198 }
 2199 
 2200 static int
 2201 biba_socket_check_visible(struct ucred *cred, struct socket *so,
 2202     struct label *solabel)
 2203 {
 2204         struct mac_biba *subj, *obj;
 2205 
 2206         if (!biba_enabled)
 2207                 return (0);
 2208 
 2209         subj = SLOT(cred->cr_label);
 2210         obj = SLOT(solabel);
 2211 
 2212         SOCK_LOCK(so);
 2213         if (!biba_dominate_effective(obj, subj)) {
 2214                 SOCK_UNLOCK(so);
 2215                 return (ENOENT);
 2216         }
 2217         SOCK_UNLOCK(so);
 2218 
 2219         return (0);
 2220 }
 2221 
 2222 static void
 2223 biba_socket_create(struct ucred *cred, struct socket *so,
 2224     struct label *solabel)
 2225 {
 2226         struct mac_biba *source, *dest;
 2227 
 2228         source = SLOT(cred->cr_label);
 2229         dest = SLOT(solabel);
 2230 
 2231         biba_copy_effective(source, dest);
 2232 }
 2233 
 2234 static void
 2235 biba_socket_create_mbuf(struct socket *so, struct label *solabel,
 2236     struct mbuf *m, struct label *mlabel)
 2237 {
 2238         struct mac_biba *source, *dest;
 2239 
 2240         source = SLOT(solabel);
 2241         dest = SLOT(mlabel);
 2242 
 2243         SOCK_LOCK(so);
 2244         biba_copy_effective(source, dest);
 2245         SOCK_UNLOCK(so);
 2246 }
 2247 
 2248 static void
 2249 biba_socket_newconn(struct socket *oldso, struct label *oldsolabel,
 2250     struct socket *newso, struct label *newsolabel)
 2251 {
 2252         struct mac_biba source, *dest;
 2253 
 2254         SOCK_LOCK(oldso);
 2255         source = *SLOT(oldsolabel);
 2256         SOCK_UNLOCK(oldso);
 2257 
 2258         dest = SLOT(newsolabel);
 2259 
 2260         SOCK_LOCK(newso);
 2261         biba_copy_effective(&source, dest);
 2262         SOCK_UNLOCK(newso);
 2263 }
 2264 
 2265 static void
 2266 biba_socket_relabel(struct ucred *cred, struct socket *so,
 2267     struct label *solabel, struct label *newlabel)
 2268 {
 2269         struct mac_biba *source, *dest;
 2270 
 2271         SOCK_LOCK_ASSERT(so);
 2272 
 2273         source = SLOT(newlabel);
 2274         dest = SLOT(solabel);
 2275 
 2276         biba_copy(source, dest);
 2277 }
 2278 
 2279 static void
 2280 biba_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel,
 2281     struct socket *so, struct label *sopeerlabel)
 2282 {
 2283         struct mac_biba *source, *dest;
 2284 
 2285         source = SLOT(mlabel);
 2286         dest = SLOT(sopeerlabel);
 2287 
 2288         SOCK_LOCK(so);
 2289         biba_copy_effective(source, dest);
 2290         SOCK_UNLOCK(so);
 2291 }
 2292 
 2293 static void
 2294 biba_socketpeer_set_from_socket(struct socket *oldso,
 2295     struct label *oldsolabel, struct socket *newso,
 2296     struct label *newsopeerlabel)
 2297 {
 2298         struct mac_biba source, *dest;
 2299 
 2300         SOCK_LOCK(oldso);
 2301         source = *SLOT(oldsolabel);
 2302         SOCK_UNLOCK(oldso);
 2303         dest = SLOT(newsopeerlabel);
 2304 
 2305         SOCK_LOCK(newso);
 2306         biba_copy_effective(&source, dest);
 2307         SOCK_UNLOCK(newso);
 2308 }
 2309 
 2310 static void
 2311 biba_syncache_create(struct label *label, struct inpcb *inp)
 2312 {
 2313         struct mac_biba *source, *dest;
 2314 
 2315         source = SLOT(inp->inp_label);
 2316         dest = SLOT(label);
 2317         biba_copy_effective(source, dest);
 2318 }
 2319 
 2320 static void
 2321 biba_syncache_create_mbuf(struct label *sc_label, struct mbuf *m,
 2322     struct label *mlabel)
 2323 {
 2324         struct mac_biba *source, *dest;
 2325 
 2326         source = SLOT(sc_label);
 2327         dest = SLOT(mlabel);
 2328         biba_copy_effective(source, dest);
 2329 }
 2330 
 2331 static int
 2332 biba_system_check_acct(struct ucred *cred, struct vnode *vp,
 2333     struct label *vplabel)
 2334 {
 2335         struct mac_biba *subj, *obj;
 2336         int error;
 2337 
 2338         if (!biba_enabled)
 2339                 return (0);
 2340 
 2341         subj = SLOT(cred->cr_label);
 2342 
 2343         error = biba_subject_privileged(subj);
 2344         if (error)
 2345                 return (error);
 2346 
 2347         if (vplabel == NULL)
 2348                 return (0);
 2349 
 2350         obj = SLOT(vplabel);
 2351         if (!biba_high_effective(obj))
 2352                 return (EACCES);
 2353 
 2354         return (0);
 2355 }
 2356 
 2357 static int
 2358 biba_system_check_auditctl(struct ucred *cred, struct vnode *vp,
 2359     struct label *vplabel)
 2360 {
 2361         struct mac_biba *subj, *obj;
 2362         int error;
 2363 
 2364         if (!biba_enabled)
 2365                 return (0);
 2366 
 2367         subj = SLOT(cred->cr_label);
 2368 
 2369         error = biba_subject_privileged(subj);
 2370         if (error)
 2371                 return (error);
 2372 
 2373         if (vplabel == NULL)
 2374                 return (0);
 2375 
 2376         obj = SLOT(vplabel);
 2377         if (!biba_high_effective(obj))
 2378                 return (EACCES);
 2379 
 2380         return (0);
 2381 }
 2382 
 2383 static int
 2384 biba_system_check_auditon(struct ucred *cred, int cmd)
 2385 {
 2386         struct mac_biba *subj;
 2387         int error;
 2388 
 2389         if (!biba_enabled)
 2390                 return (0);
 2391 
 2392         subj = SLOT(cred->cr_label);
 2393 
 2394         error = biba_subject_privileged(subj);
 2395         if (error)
 2396                 return (error);
 2397 
 2398         return (0);
 2399 }
 2400 
 2401 static int
 2402 biba_system_check_swapoff(struct ucred *cred, struct vnode *vp,
 2403     struct label *label)
 2404 {
 2405         struct mac_biba *subj;
 2406         int error;
 2407 
 2408         if (!biba_enabled)
 2409                 return (0);
 2410 
 2411         subj = SLOT(cred->cr_label);
 2412 
 2413         error = biba_subject_privileged(subj);
 2414         if (error)
 2415                 return (error);
 2416 
 2417         return (0);
 2418 }
 2419 
 2420 static int
 2421 biba_system_check_swapon(struct ucred *cred, struct vnode *vp,
 2422     struct label *vplabel)
 2423 {
 2424         struct mac_biba *subj, *obj;
 2425         int error;
 2426 
 2427         if (!biba_enabled)
 2428                 return (0);
 2429 
 2430         subj = SLOT(cred->cr_label);
 2431         obj = SLOT(vplabel);
 2432 
 2433         error = biba_subject_privileged(subj);
 2434         if (error)
 2435                 return (error);
 2436 
 2437         if (!biba_high_effective(obj))
 2438                 return (EACCES);
 2439 
 2440         return (0);
 2441 }
 2442 
 2443 static int
 2444 biba_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp,
 2445     void *arg1, int arg2, struct sysctl_req *req)
 2446 {
 2447         struct mac_biba *subj;
 2448         int error;
 2449 
 2450         if (!biba_enabled)
 2451                 return (0);
 2452 
 2453         subj = SLOT(cred->cr_label);
 2454 
 2455         /*
 2456          * Treat sysctl variables without CTLFLAG_ANYBODY flag as biba/high,
 2457          * but also require privilege to change them.
 2458          */
 2459         if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) {
 2460                 if (!biba_subject_dominate_high(subj))
 2461                         return (EACCES);
 2462 
 2463                 error = biba_subject_privileged(subj);
 2464                 if (error)
 2465                         return (error);
 2466         }
 2467 
 2468         return (0);
 2469 }
 2470 
 2471 static void
 2472 biba_sysvmsg_cleanup(struct label *msglabel)
 2473 {
 2474 
 2475         bzero(SLOT(msglabel), sizeof(struct mac_biba));
 2476 }
 2477 
 2478 static void
 2479 biba_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr,
 2480     struct label *msqlabel, struct msg *msgptr, struct label *msglabel)
 2481 {
 2482         struct mac_biba *source, *dest;
 2483 
 2484         /* Ignore the msgq label */
 2485         source = SLOT(cred->cr_label);
 2486         dest = SLOT(msglabel);
 2487 
 2488         biba_copy_effective(source, dest);
 2489 }
 2490 
 2491 static int
 2492 biba_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr,
 2493     struct label *msglabel)
 2494 {
 2495         struct mac_biba *subj, *obj;
 2496 
 2497         if (!biba_enabled)
 2498                 return (0);
 2499 
 2500         subj = SLOT(cred->cr_label);
 2501         obj = SLOT(msglabel);
 2502 
 2503         if (!biba_dominate_effective(obj, subj))
 2504                 return (EACCES);
 2505 
 2506         return (0);
 2507 }
 2508 
 2509 static int
 2510 biba_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr,
 2511     struct label *msglabel)
 2512 {
 2513         struct mac_biba *subj, *obj;
 2514 
 2515         if (!biba_enabled)
 2516                 return (0);
 2517 
 2518         subj = SLOT(cred->cr_label);
 2519         obj = SLOT(msglabel);
 2520 
 2521         if (!biba_dominate_effective(subj, obj))
 2522                 return (EACCES);
 2523 
 2524         return (0);
 2525 }
 2526 
 2527 static int
 2528 biba_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr,
 2529     struct label *msqklabel)
 2530 {
 2531         struct mac_biba *subj, *obj;
 2532 
 2533         if (!biba_enabled)
 2534                 return (0);
 2535 
 2536         subj = SLOT(cred->cr_label);
 2537         obj = SLOT(msqklabel);
 2538 
 2539         if (!biba_dominate_effective(obj, subj))
 2540                 return (EACCES);
 2541 
 2542         return (0);
 2543 }
 2544 
 2545 static int
 2546 biba_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr,
 2547     struct label *msqklabel)
 2548 {
 2549         struct mac_biba *subj, *obj;
 2550 
 2551         if (!biba_enabled)
 2552                 return (0);
 2553 
 2554         subj = SLOT(cred->cr_label);
 2555         obj = SLOT(msqklabel);
 2556 
 2557         if (!biba_dominate_effective(subj, obj))
 2558                 return (EACCES);
 2559 
 2560         return (0);
 2561 }
 2562 
 2563 static int
 2564 biba_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr,
 2565     struct label *msqklabel)
 2566 {
 2567         struct mac_biba *subj, *obj;
 2568 
 2569         if (!biba_enabled)
 2570                 return (0);
 2571 
 2572         subj = SLOT(cred->cr_label);
 2573         obj = SLOT(msqklabel);
 2574 
 2575         if (!biba_dominate_effective(obj, subj))
 2576                 return (EACCES);
 2577 
 2578         return (0);
 2579 }
 2580 
 2581 static int
 2582 biba_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr,
 2583     struct label *msqklabel, int cmd)
 2584 {
 2585         struct mac_biba *subj, *obj;
 2586 
 2587         if (!biba_enabled)
 2588                 return (0);
 2589 
 2590         subj = SLOT(cred->cr_label);
 2591         obj = SLOT(msqklabel);
 2592 
 2593         switch(cmd) {
 2594         case IPC_RMID:
 2595         case IPC_SET:
 2596                 if (!biba_dominate_effective(subj, obj))
 2597                         return (EACCES);
 2598                 break;
 2599 
 2600         case IPC_STAT:
 2601                 if (!biba_dominate_effective(obj, subj))
 2602                         return (EACCES);
 2603                 break;
 2604 
 2605         default:
 2606                 return (EACCES);
 2607         }
 2608 
 2609         return (0);
 2610 }
 2611 
 2612 static void
 2613 biba_sysvmsq_cleanup(struct label *msqlabel)
 2614 {
 2615 
 2616         bzero(SLOT(msqlabel), sizeof(struct mac_biba));
 2617 }
 2618 
 2619 static void
 2620 biba_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr,
 2621     struct label *msqlabel)
 2622 {
 2623         struct mac_biba *source, *dest;
 2624 
 2625         source = SLOT(cred->cr_label);
 2626         dest = SLOT(msqlabel);
 2627 
 2628         biba_copy_effective(source, dest);
 2629 }
 2630 
 2631 static int
 2632 biba_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr,
 2633     struct label *semaklabel, int cmd)
 2634 {
 2635         struct mac_biba *subj, *obj;
 2636 
 2637         if (!biba_enabled)
 2638                 return (0);
 2639 
 2640         subj = SLOT(cred->cr_label);
 2641         obj = SLOT(semaklabel);
 2642 
 2643         switch(cmd) {
 2644         case IPC_RMID:
 2645         case IPC_SET:
 2646         case SETVAL:
 2647         case SETALL:
 2648                 if (!biba_dominate_effective(subj, obj))
 2649                         return (EACCES);
 2650                 break;
 2651 
 2652         case IPC_STAT:
 2653         case GETVAL:
 2654         case GETPID:
 2655         case GETNCNT:
 2656         case GETZCNT:
 2657         case GETALL:
 2658                 if (!biba_dominate_effective(obj, subj))
 2659                         return (EACCES);
 2660                 break;
 2661 
 2662         default:
 2663                 return (EACCES);
 2664         }
 2665 
 2666         return (0);
 2667 }
 2668 
 2669 static int
 2670 biba_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr,
 2671     struct label *semaklabel)
 2672 {
 2673         struct mac_biba *subj, *obj;
 2674 
 2675         if (!biba_enabled)
 2676                 return (0);
 2677 
 2678         subj = SLOT(cred->cr_label);
 2679         obj = SLOT(semaklabel);
 2680 
 2681         if (!biba_dominate_effective(obj, subj))
 2682                 return (EACCES);
 2683 
 2684         return (0);
 2685 }
 2686 
 2687 static int
 2688 biba_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr,
 2689     struct label *semaklabel, size_t accesstype)
 2690 {
 2691         struct mac_biba *subj, *obj;
 2692 
 2693         if (!biba_enabled)
 2694                 return (0);
 2695 
 2696         subj = SLOT(cred->cr_label);
 2697         obj = SLOT(semaklabel);
 2698 
 2699         if (accesstype & SEM_R)
 2700                 if (!biba_dominate_effective(obj, subj))
 2701                         return (EACCES);
 2702 
 2703         if (accesstype & SEM_A)
 2704                 if (!biba_dominate_effective(subj, obj))
 2705                         return (EACCES);
 2706 
 2707         return (0);
 2708 }
 2709 
 2710 static void
 2711 biba_sysvsem_cleanup(struct label *semalabel)
 2712 {
 2713 
 2714         bzero(SLOT(semalabel), sizeof(struct mac_biba));
 2715 }
 2716 
 2717 static void
 2718 biba_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr,
 2719     struct label *semalabel)
 2720 {
 2721         struct mac_biba *source, *dest;
 2722 
 2723         source = SLOT(cred->cr_label);
 2724         dest = SLOT(semalabel);
 2725 
 2726         biba_copy_effective(source, dest);
 2727 }
 2728 
 2729 static int
 2730 biba_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
 2731     struct label *shmseglabel, int shmflg)
 2732 {
 2733         struct mac_biba *subj, *obj;
 2734 
 2735         if (!biba_enabled)
 2736                 return (0);
 2737 
 2738         subj = SLOT(cred->cr_label);
 2739         obj = SLOT(shmseglabel);
 2740 
 2741         if (!biba_dominate_effective(obj, subj))
 2742                 return (EACCES);
 2743         if ((shmflg & SHM_RDONLY) == 0) {
 2744                 if (!biba_dominate_effective(subj, obj))
 2745                         return (EACCES);
 2746         }
 2747         
 2748         return (0);
 2749 }
 2750 
 2751 static int
 2752 biba_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
 2753     struct label *shmseglabel, int cmd)
 2754 {
 2755         struct mac_biba *subj, *obj;
 2756 
 2757         if (!biba_enabled)
 2758                 return (0);
 2759 
 2760         subj = SLOT(cred->cr_label);
 2761         obj = SLOT(shmseglabel);
 2762 
 2763         switch(cmd) {
 2764         case IPC_RMID:
 2765         case IPC_SET:
 2766                 if (!biba_dominate_effective(subj, obj))
 2767                         return (EACCES);
 2768                 break;
 2769 
 2770         case IPC_STAT:
 2771         case SHM_STAT:
 2772                 if (!biba_dominate_effective(obj, subj))
 2773                         return (EACCES);
 2774                 break;
 2775 
 2776         default:
 2777                 return (EACCES);
 2778         }
 2779 
 2780         return (0);
 2781 }
 2782 
 2783 static int
 2784 biba_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
 2785     struct label *shmseglabel, int shmflg)
 2786 {
 2787         struct mac_biba *subj, *obj;
 2788 
 2789         if (!biba_enabled)
 2790                 return (0);
 2791 
 2792         subj = SLOT(cred->cr_label);
 2793         obj = SLOT(shmseglabel);
 2794 
 2795         if (!biba_dominate_effective(obj, subj))
 2796                 return (EACCES);
 2797 
 2798         return (0);
 2799 }
 2800 
 2801 static void
 2802 biba_sysvshm_cleanup(struct label *shmlabel)
 2803 {
 2804 
 2805         bzero(SLOT(shmlabel), sizeof(struct mac_biba));
 2806 }
 2807 
 2808 static void
 2809 biba_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr,
 2810     struct label *shmlabel)
 2811 {
 2812         struct mac_biba *source, *dest;
 2813 
 2814         source = SLOT(cred->cr_label);
 2815         dest = SLOT(shmlabel);
 2816 
 2817         biba_copy_effective(source, dest);
 2818 }
 2819 
 2820 static int
 2821 biba_vnode_associate_extattr(struct mount *mp, struct label *mplabel,
 2822     struct vnode *vp, struct label *vplabel)
 2823 {
 2824         struct mac_biba mb_temp, *source, *dest;
 2825         int buflen, error;
 2826 
 2827         source = SLOT(mplabel);
 2828         dest = SLOT(vplabel);
 2829 
 2830         buflen = sizeof(mb_temp);
 2831         bzero(&mb_temp, buflen);
 2832 
 2833         error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
 2834             MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &mb_temp, curthread);
 2835         if (error == ENOATTR || error == EOPNOTSUPP) {
 2836                 /* Fall back to the mntlabel. */
 2837                 biba_copy_effective(source, dest);
 2838                 return (0);
 2839         } else if (error)
 2840                 return (error);
 2841 
 2842         if (buflen != sizeof(mb_temp)) {
 2843                 printf("biba_vnode_associate_extattr: bad size %d\n",
 2844                     buflen);
 2845                 return (EPERM);
 2846         }
 2847         if (biba_valid(&mb_temp) != 0) {
 2848                 printf("biba_vnode_associate_extattr: invalid\n");
 2849                 return (EPERM);
 2850         }
 2851         if ((mb_temp.mb_flags & MAC_BIBA_FLAGS_BOTH) !=
 2852             MAC_BIBA_FLAG_EFFECTIVE) {
 2853                 printf("biba_vnode_associate_extattr: not effective\n");
 2854                 return (EPERM);
 2855         }
 2856 
 2857         biba_copy_effective(&mb_temp, dest);
 2858         return (0);
 2859 }
 2860 
 2861 static void
 2862 biba_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel,
 2863     struct vnode *vp, struct label *vplabel)
 2864 {
 2865         struct mac_biba *source, *dest;
 2866 
 2867         source = SLOT(mplabel);
 2868         dest = SLOT(vplabel);
 2869 
 2870         biba_copy_effective(source, dest);
 2871 }
 2872 
 2873 static int
 2874 biba_vnode_check_chdir(struct ucred *cred, struct vnode *dvp,
 2875     struct label *dvplabel)
 2876 {
 2877         struct mac_biba *subj, *obj;
 2878 
 2879         if (!biba_enabled)
 2880                 return (0);
 2881 
 2882         subj = SLOT(cred->cr_label);
 2883         obj = SLOT(dvplabel);
 2884 
 2885         if (!biba_dominate_effective(obj, subj))
 2886                 return (EACCES);
 2887 
 2888         return (0);
 2889 }
 2890 
 2891 static int
 2892 biba_vnode_check_chroot(struct ucred *cred, struct vnode *dvp,
 2893     struct label *dvplabel)
 2894 {
 2895         struct mac_biba *subj, *obj;
 2896 
 2897         if (!biba_enabled)
 2898                 return (0);
 2899 
 2900         subj = SLOT(cred->cr_label);
 2901         obj = SLOT(dvplabel);
 2902 
 2903         if (!biba_dominate_effective(obj, subj))
 2904                 return (EACCES);
 2905 
 2906         return (0);
 2907 }
 2908 
 2909 static int
 2910 biba_vnode_check_create(struct ucred *cred, struct vnode *dvp,
 2911     struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
 2912 {
 2913         struct mac_biba *subj, *obj;
 2914 
 2915         if (!biba_enabled)
 2916                 return (0);
 2917 
 2918         subj = SLOT(cred->cr_label);
 2919         obj = SLOT(dvplabel);
 2920 
 2921         if (!biba_dominate_effective(subj, obj))
 2922                 return (EACCES);
 2923 
 2924         return (0);
 2925 }
 2926 
 2927 static int
 2928 biba_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
 2929     struct label *vplabel, acl_type_t type)
 2930 {
 2931         struct mac_biba *subj, *obj;
 2932 
 2933         if (!biba_enabled)
 2934                 return (0);
 2935 
 2936         subj = SLOT(cred->cr_label);
 2937         obj = SLOT(vplabel);
 2938 
 2939         if (!biba_dominate_effective(subj, obj))
 2940                 return (EACCES);
 2941 
 2942         return (0);
 2943 }
 2944 
 2945 static int
 2946 biba_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp,
 2947     struct label *vplabel, int attrnamespace, const char *name)
 2948 {
 2949         struct mac_biba *subj, *obj;
 2950 
 2951         if (!biba_enabled)
 2952                 return (0);
 2953 
 2954         subj = SLOT(cred->cr_label);
 2955         obj = SLOT(vplabel);
 2956 
 2957         if (!biba_dominate_effective(subj, obj))
 2958                 return (EACCES);
 2959 
 2960         return (0);
 2961 }
 2962 
 2963 static int
 2964 biba_vnode_check_exec(struct ucred *cred, struct vnode *vp,
 2965     struct label *vplabel, struct image_params *imgp,
 2966     struct label *execlabel)
 2967 {
 2968         struct mac_biba *subj, *obj, *exec;
 2969         int error;
 2970 
 2971         if (execlabel != NULL) {
 2972                 /*
 2973                  * We currently don't permit labels to be changed at
 2974                  * exec-time as part of Biba, so disallow non-NULL Biba label
 2975                  * elements in the execlabel.
 2976                  */
 2977                 exec = SLOT(execlabel);
 2978                 error = biba_atmostflags(exec, 0);
 2979                 if (error)
 2980                         return (error);
 2981         }
 2982 
 2983         if (!biba_enabled)
 2984                 return (0);
 2985 
 2986         subj = SLOT(cred->cr_label);
 2987         obj = SLOT(vplabel);
 2988 
 2989         if (!biba_dominate_effective(obj, subj))
 2990                 return (EACCES);
 2991 
 2992         return (0);
 2993 }
 2994 
 2995 static int
 2996 biba_vnode_check_getacl(struct ucred *cred, struct vnode *vp,
 2997     struct label *vplabel, acl_type_t type)
 2998 {
 2999         struct mac_biba *subj, *obj;
 3000 
 3001         if (!biba_enabled)
 3002                 return (0);
 3003 
 3004         subj = SLOT(cred->cr_label);
 3005         obj = SLOT(vplabel);
 3006 
 3007         if (!biba_dominate_effective(obj, subj))
 3008                 return (EACCES);
 3009 
 3010         return (0);
 3011 }
 3012 
 3013 static int
 3014 biba_vnode_check_getextattr(struct ucred *cred, struct vnode *vp,
 3015     struct label *vplabel, int attrnamespace, const char *name)
 3016 {
 3017         struct mac_biba *subj, *obj;
 3018 
 3019         if (!biba_enabled)
 3020                 return (0);
 3021 
 3022         subj = SLOT(cred->cr_label);
 3023         obj = SLOT(vplabel);
 3024 
 3025         if (!biba_dominate_effective(obj, subj))
 3026                 return (EACCES);
 3027 
 3028         return (0);
 3029 }
 3030 
 3031 static int
 3032 biba_vnode_check_link(struct ucred *cred, struct vnode *dvp,
 3033     struct label *dvplabel, struct vnode *vp, struct label *vplabel,
 3034     struct componentname *cnp)
 3035 {
 3036         struct mac_biba *subj, *obj;
 3037 
 3038         if (!biba_enabled)
 3039                 return (0);
 3040 
 3041         subj = SLOT(cred->cr_label);
 3042         obj = SLOT(dvplabel);
 3043 
 3044         if (!biba_dominate_effective(subj, obj))
 3045                 return (EACCES);
 3046 
 3047         obj = SLOT(vplabel);
 3048 
 3049         if (!biba_dominate_effective(subj, obj))
 3050                 return (EACCES);
 3051 
 3052         return (0);
 3053 }
 3054 
 3055 static int
 3056 biba_vnode_check_listextattr(struct ucred *cred, struct vnode *vp,
 3057     struct label *vplabel, int attrnamespace)
 3058 {
 3059         struct mac_biba *subj, *obj;
 3060 
 3061         if (!biba_enabled)
 3062                 return (0);
 3063 
 3064         subj = SLOT(cred->cr_label);
 3065         obj = SLOT(vplabel);
 3066 
 3067         if (!biba_dominate_effective(obj, subj))
 3068                 return (EACCES);
 3069 
 3070         return (0);
 3071 }
 3072 
 3073 static int
 3074 biba_vnode_check_lookup(struct ucred *cred, struct vnode *dvp,
 3075     struct label *dvplabel, struct componentname *cnp)
 3076 {
 3077         struct mac_biba *subj, *obj;
 3078 
 3079         if (!biba_enabled)
 3080                 return (0);
 3081 
 3082         subj = SLOT(cred->cr_label);
 3083         obj = SLOT(dvplabel);
 3084 
 3085         if (!biba_dominate_effective(obj, subj))
 3086                 return (EACCES);
 3087 
 3088         return (0);
 3089 }
 3090 
 3091 static int
 3092 biba_vnode_check_mmap(struct ucred *cred, struct vnode *vp,
 3093     struct label *vplabel, int prot, int flags)
 3094 {
 3095         struct mac_biba *subj, *obj;
 3096 
 3097         /*
 3098          * Rely on the use of open()-time protections to handle
 3099          * non-revocation cases.
 3100          */
 3101         if (!biba_enabled || !revocation_enabled)
 3102                 return (0);
 3103 
 3104         subj = SLOT(cred->cr_label);
 3105         obj = SLOT(vplabel);
 3106 
 3107         if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
 3108                 if (!biba_dominate_effective(obj, subj))
 3109                         return (EACCES);
 3110         }
 3111         if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
 3112                 if (!biba_dominate_effective(subj, obj))
 3113                         return (EACCES);
 3114         }
 3115 
 3116         return (0);
 3117 }
 3118 
 3119 static int
 3120 biba_vnode_check_open(struct ucred *cred, struct vnode *vp,
 3121     struct label *vplabel, accmode_t accmode)
 3122 {
 3123         struct mac_biba *subj, *obj;
 3124 
 3125         if (!biba_enabled)
 3126                 return (0);
 3127 
 3128         subj = SLOT(cred->cr_label);
 3129         obj = SLOT(vplabel);
 3130 
 3131         /* XXX privilege override for admin? */
 3132         if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) {
 3133                 if (!biba_dominate_effective(obj, subj))
 3134                         return (EACCES);
 3135         }
 3136         if (accmode & VMODIFY_PERMS) {
 3137                 if (!biba_dominate_effective(subj, obj))
 3138                         return (EACCES);
 3139         }
 3140 
 3141         return (0);
 3142 }
 3143 
 3144 static int
 3145 biba_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred,
 3146     struct vnode *vp, struct label *vplabel)
 3147 {
 3148         struct mac_biba *subj, *obj;
 3149 
 3150         if (!biba_enabled || !revocation_enabled)
 3151                 return (0);
 3152 
 3153         subj = SLOT(active_cred->cr_label);
 3154         obj = SLOT(vplabel);
 3155 
 3156         if (!biba_dominate_effective(obj, subj))
 3157                 return (EACCES);
 3158 
 3159         return (0);
 3160 }
 3161 
 3162 static int
 3163 biba_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred,
 3164     struct vnode *vp, struct label *vplabel)
 3165 {
 3166         struct mac_biba *subj, *obj;
 3167 
 3168         if (!biba_enabled || !revocation_enabled)
 3169                 return (0);
 3170 
 3171         subj = SLOT(active_cred->cr_label);
 3172         obj = SLOT(vplabel);
 3173 
 3174         if (!biba_dominate_effective(obj, subj))
 3175                 return (EACCES);
 3176 
 3177         return (0);
 3178 }
 3179 
 3180 static int
 3181 biba_vnode_check_readdir(struct ucred *cred, struct vnode *dvp,
 3182     struct label *dvplabel)
 3183 {
 3184         struct mac_biba *subj, *obj;
 3185 
 3186         if (!biba_enabled)
 3187                 return (0);
 3188 
 3189         subj = SLOT(cred->cr_label);
 3190         obj = SLOT(dvplabel);
 3191 
 3192         if (!biba_dominate_effective(obj, subj))
 3193                 return (EACCES);
 3194 
 3195         return (0);
 3196 }
 3197 
 3198 static int
 3199 biba_vnode_check_readlink(struct ucred *cred, struct vnode *vp,
 3200     struct label *vplabel)
 3201 {
 3202         struct mac_biba *subj, *obj;
 3203 
 3204         if (!biba_enabled)
 3205                 return (0);
 3206 
 3207         subj = SLOT(cred->cr_label);
 3208         obj = SLOT(vplabel);
 3209 
 3210         if (!biba_dominate_effective(obj, subj))
 3211                 return (EACCES);
 3212 
 3213         return (0);
 3214 }
 3215 
 3216 static int
 3217 biba_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
 3218     struct label *vplabel, struct label *newlabel)
 3219 {
 3220         struct mac_biba *old, *new, *subj;
 3221         int error;
 3222 
 3223         old = SLOT(vplabel);
 3224         new = SLOT(newlabel);
 3225         subj = SLOT(cred->cr_label);
 3226 
 3227         /*
 3228          * If there is a Biba label update for the vnode, it must be a
 3229          * effective label.
 3230          */
 3231         error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
 3232         if (error)
 3233                 return (error);
 3234 
 3235         /*
 3236          * To perform a relabel of the vnode (Biba label or not), Biba must
 3237          * authorize the relabel.
 3238          */
 3239         if (!biba_effective_in_range(old, subj))
 3240                 return (EPERM);
 3241 
 3242         /*
 3243          * If the Biba label is to be changed, authorize as appropriate.
 3244          */
 3245         if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
 3246                 /*
 3247                  * To change the Biba label on a vnode, the new vnode label
 3248                  * must be in the subject range.
 3249                  */
 3250                 if (!biba_effective_in_range(new, subj))
 3251                         return (EPERM);
 3252 
 3253                 /*
 3254                  * To change the Biba label on the vnode to be EQUAL, the
 3255                  * subject must have appropriate privilege.
 3256                  */
 3257                 if (biba_contains_equal(new)) {
 3258                         error = biba_subject_privileged(subj);
 3259                         if (error)
 3260                                 return (error);
 3261                 }
 3262         }
 3263 
 3264         return (0);
 3265 }
 3266 
 3267 static int
 3268 biba_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
 3269     struct label *dvplabel, struct vnode *vp, struct label *vplabel,
 3270     struct componentname *cnp)
 3271 {
 3272         struct mac_biba *subj, *obj;
 3273 
 3274         if (!biba_enabled)
 3275                 return (0);
 3276 
 3277         subj = SLOT(cred->cr_label);
 3278         obj = SLOT(dvplabel);
 3279 
 3280         if (!biba_dominate_effective(subj, obj))
 3281                 return (EACCES);
 3282 
 3283         obj = SLOT(vplabel);
 3284 
 3285         if (!biba_dominate_effective(subj, obj))
 3286                 return (EACCES);
 3287 
 3288         return (0);
 3289 }
 3290 
 3291 static int
 3292 biba_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
 3293     struct label *dvplabel, struct vnode *vp, struct label *vplabel,
 3294     int samedir, struct componentname *cnp)
 3295 {
 3296         struct mac_biba *subj, *obj;
 3297 
 3298         if (!biba_enabled)
 3299                 return (0);
 3300 
 3301         subj = SLOT(cred->cr_label);
 3302         obj = SLOT(dvplabel);
 3303 
 3304         if (!biba_dominate_effective(subj, obj))
 3305                 return (EACCES);
 3306 
 3307         if (vp != NULL) {
 3308                 obj = SLOT(vplabel);
 3309 
 3310                 if (!biba_dominate_effective(subj, obj))
 3311                         return (EACCES);
 3312         }
 3313 
 3314         return (0);
 3315 }
 3316 
 3317 static int
 3318 biba_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
 3319     struct label *vplabel)
 3320 {
 3321         struct mac_biba *subj, *obj;
 3322 
 3323         if (!biba_enabled)
 3324                 return (0);
 3325 
 3326         subj = SLOT(cred->cr_label);
 3327         obj = SLOT(vplabel);
 3328 
 3329         if (!biba_dominate_effective(subj, obj))
 3330                 return (EACCES);
 3331 
 3332         return (0);
 3333 }
 3334 
 3335 static int
 3336 biba_vnode_check_setacl(struct ucred *cred, struct vnode *vp,
 3337     struct label *vplabel, acl_type_t type, struct acl *acl)
 3338 {
 3339         struct mac_biba *subj, *obj;
 3340 
 3341         if (!biba_enabled)
 3342                 return (0);
 3343 
 3344         subj = SLOT(cred->cr_label);
 3345         obj = SLOT(vplabel);
 3346 
 3347         if (!biba_dominate_effective(subj, obj))
 3348                 return (EACCES);
 3349 
 3350         return (0);
 3351 }
 3352 
 3353 static int
 3354 biba_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
 3355     struct label *vplabel, int attrnamespace, const char *name)
 3356 {
 3357         struct mac_biba *subj, *obj;
 3358 
 3359         if (!biba_enabled)
 3360                 return (0);
 3361 
 3362         subj = SLOT(cred->cr_label);
 3363         obj = SLOT(vplabel);
 3364 
 3365         if (!biba_dominate_effective(subj, obj))
 3366                 return (EACCES);
 3367 
 3368         /* XXX: protect the MAC EA in a special way? */
 3369 
 3370         return (0);
 3371 }
 3372 
 3373 static int
 3374 biba_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
 3375     struct label *vplabel, u_long flags)
 3376 {
 3377         struct mac_biba *subj, *obj;
 3378 
 3379         if (!biba_enabled)
 3380                 return (0);
 3381 
 3382         subj = SLOT(cred->cr_label);
 3383         obj = SLOT(vplabel);
 3384 
 3385         if (!biba_dominate_effective(subj, obj))
 3386                 return (EACCES);
 3387 
 3388         return (0);
 3389 }
 3390 
 3391 static int
 3392 biba_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
 3393     struct label *vplabel, mode_t mode)
 3394 {
 3395         struct mac_biba *subj, *obj;
 3396 
 3397         if (!biba_enabled)
 3398                 return (0);
 3399 
 3400         subj = SLOT(cred->cr_label);
 3401         obj = SLOT(vplabel);
 3402 
 3403         if (!biba_dominate_effective(subj, obj))
 3404                 return (EACCES);
 3405 
 3406         return (0);
 3407 }
 3408 
 3409 static int
 3410 biba_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
 3411     struct label *vplabel, uid_t uid, gid_t gid)
 3412 {
 3413         struct mac_biba *subj, *obj;
 3414 
 3415         if (!biba_enabled)
 3416                 return (0);
 3417 
 3418         subj = SLOT(cred->cr_label);
 3419         obj = SLOT(vplabel);
 3420 
 3421         if (!biba_dominate_effective(subj, obj))
 3422                 return (EACCES);
 3423 
 3424         return (0);
 3425 }
 3426 
 3427 static int
 3428 biba_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
 3429     struct label *vplabel, struct timespec atime, struct timespec mtime)
 3430 {
 3431         struct mac_biba *subj, *obj;
 3432 
 3433         if (!biba_enabled)
 3434                 return (0);
 3435 
 3436         subj = SLOT(cred->cr_label);
 3437         obj = SLOT(vplabel);
 3438 
 3439         if (!biba_dominate_effective(subj, obj))
 3440                 return (EACCES);
 3441 
 3442         return (0);
 3443 }
 3444 
 3445 static int
 3446 biba_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred,
 3447     struct vnode *vp, struct label *vplabel)
 3448 {
 3449         struct mac_biba *subj, *obj;
 3450 
 3451         if (!biba_enabled)
 3452                 return (0);
 3453 
 3454         subj = SLOT(active_cred->cr_label);
 3455         obj = SLOT(vplabel);
 3456 
 3457         if (!biba_dominate_effective(obj, subj))
 3458                 return (EACCES);
 3459 
 3460         return (0);
 3461 }
 3462 
 3463 static int
 3464 biba_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
 3465     struct label *dvplabel, struct vnode *vp, struct label *vplabel,
 3466     struct componentname *cnp)
 3467 {
 3468         struct mac_biba *subj, *obj;
 3469 
 3470         if (!biba_enabled)
 3471                 return (0);
 3472 
 3473         subj = SLOT(cred->cr_label);
 3474         obj = SLOT(dvplabel);
 3475 
 3476         if (!biba_dominate_effective(subj, obj))
 3477                 return (EACCES);
 3478 
 3479         obj = SLOT(vplabel);
 3480 
 3481         if (!biba_dominate_effective(subj, obj))
 3482                 return (EACCES);
 3483 
 3484         return (0);
 3485 }
 3486 
 3487 static int
 3488 biba_vnode_check_write(struct ucred *active_cred,
 3489     struct ucred *file_cred, struct vnode *vp, struct label *vplabel)
 3490 {
 3491         struct mac_biba *subj, *obj;
 3492 
 3493         if (!biba_enabled || !revocation_enabled)
 3494                 return (0);
 3495 
 3496         subj = SLOT(active_cred->cr_label);
 3497         obj = SLOT(vplabel);
 3498 
 3499         if (!biba_dominate_effective(subj, obj))
 3500                 return (EACCES);
 3501 
 3502         return (0);
 3503 }
 3504 
 3505 static int
 3506 biba_vnode_create_extattr(struct ucred *cred, struct mount *mp,
 3507     struct label *mplabel, struct vnode *dvp, struct label *dvplabel,
 3508     struct vnode *vp, struct label *vplabel, struct componentname *cnp)
 3509 {
 3510         struct mac_biba *source, *dest, mb_temp;
 3511         size_t buflen;
 3512         int error;
 3513 
 3514         buflen = sizeof(mb_temp);
 3515         bzero(&mb_temp, buflen);
 3516 
 3517         source = SLOT(cred->cr_label);
 3518         dest = SLOT(vplabel);
 3519         biba_copy_effective(source, &mb_temp);
 3520 
 3521         error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
 3522             MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread);
 3523         if (error == 0)
 3524                 biba_copy_effective(source, dest);
 3525         return (error);
 3526 }
 3527 
 3528 static void
 3529 biba_vnode_relabel(struct ucred *cred, struct vnode *vp,
 3530     struct label *vplabel, struct label *newlabel)
 3531 {
 3532         struct mac_biba *source, *dest;
 3533 
 3534         source = SLOT(newlabel);
 3535         dest = SLOT(vplabel);
 3536 
 3537         biba_copy(source, dest);
 3538 }
 3539 
 3540 static int
 3541 biba_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
 3542     struct label *vplabel, struct label *intlabel)
 3543 {
 3544         struct mac_biba *source, mb_temp;
 3545         size_t buflen;
 3546         int error;
 3547 
 3548         buflen = sizeof(mb_temp);
 3549         bzero(&mb_temp, buflen);
 3550 
 3551         source = SLOT(intlabel);
 3552         if ((source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) == 0)
 3553                 return (0);
 3554 
 3555         biba_copy_effective(source, &mb_temp);
 3556 
 3557         error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
 3558             MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread);
 3559         return (error);
 3560 }
 3561 
 3562 static struct mac_policy_ops mac_biba_ops =
 3563 {
 3564         .mpo_init = biba_init,
 3565 
 3566         .mpo_bpfdesc_check_receive = biba_bpfdesc_check_receive,
 3567         .mpo_bpfdesc_create = biba_bpfdesc_create,
 3568         .mpo_bpfdesc_create_mbuf = biba_bpfdesc_create_mbuf,
 3569         .mpo_bpfdesc_destroy_label = biba_destroy_label,
 3570         .mpo_bpfdesc_init_label = biba_init_label,
 3571 
 3572         .mpo_cred_associate_nfsd = biba_cred_associate_nfsd,
 3573         .mpo_cred_check_relabel = biba_cred_check_relabel,
 3574         .mpo_cred_check_visible = biba_cred_check_visible,
 3575         .mpo_cred_copy_label = biba_copy_label,
 3576         .mpo_cred_create_init = biba_cred_create_init,
 3577         .mpo_cred_create_swapper = biba_cred_create_swapper,
 3578         .mpo_cred_destroy_label = biba_destroy_label,
 3579         .mpo_cred_externalize_label = biba_externalize_label,
 3580         .mpo_cred_init_label = biba_init_label,
 3581         .mpo_cred_internalize_label = biba_internalize_label,
 3582         .mpo_cred_relabel = biba_cred_relabel,
 3583 
 3584         .mpo_devfs_create_device = biba_devfs_create_device,
 3585         .mpo_devfs_create_directory = biba_devfs_create_directory,
 3586         .mpo_devfs_create_symlink = biba_devfs_create_symlink,
 3587         .mpo_devfs_destroy_label = biba_destroy_label,
 3588         .mpo_devfs_init_label = biba_init_label,
 3589         .mpo_devfs_update = biba_devfs_update,
 3590         .mpo_devfs_vnode_associate = biba_devfs_vnode_associate,
 3591 
 3592         .mpo_ifnet_check_relabel = biba_ifnet_check_relabel,
 3593         .mpo_ifnet_check_transmit = biba_ifnet_check_transmit,
 3594         .mpo_ifnet_copy_label = biba_copy_label,
 3595         .mpo_ifnet_create = biba_ifnet_create,
 3596         .mpo_ifnet_create_mbuf = biba_ifnet_create_mbuf,
 3597         .mpo_ifnet_destroy_label = biba_destroy_label,
 3598         .mpo_ifnet_externalize_label = biba_externalize_label,
 3599         .mpo_ifnet_init_label = biba_init_label,
 3600         .mpo_ifnet_internalize_label = biba_internalize_label,
 3601         .mpo_ifnet_relabel = biba_ifnet_relabel,
 3602 
 3603         .mpo_inpcb_check_deliver = biba_inpcb_check_deliver,
 3604         .mpo_inpcb_check_visible = biba_inpcb_check_visible,
 3605         .mpo_inpcb_create = biba_inpcb_create,
 3606         .mpo_inpcb_create_mbuf = biba_inpcb_create_mbuf,
 3607         .mpo_inpcb_destroy_label = biba_destroy_label,
 3608         .mpo_inpcb_init_label = biba_init_label_waitcheck,
 3609         .mpo_inpcb_sosetlabel = biba_inpcb_sosetlabel,
 3610 
 3611         .mpo_ip6q_create = biba_ip6q_create,
 3612         .mpo_ip6q_destroy_label = biba_destroy_label,
 3613         .mpo_ip6q_init_label = biba_init_label_waitcheck,
 3614         .mpo_ip6q_match = biba_ip6q_match,
 3615         .mpo_ip6q_reassemble = biba_ip6q_reassemble,
 3616         .mpo_ip6q_update = biba_ip6q_update,
 3617 
 3618         .mpo_ipq_create = biba_ipq_create,
 3619         .mpo_ipq_destroy_label = biba_destroy_label,
 3620         .mpo_ipq_init_label = biba_init_label_waitcheck,
 3621         .mpo_ipq_match = biba_ipq_match,
 3622         .mpo_ipq_reassemble = biba_ipq_reassemble,
 3623         .mpo_ipq_update = biba_ipq_update,
 3624 
 3625         .mpo_kld_check_load = biba_kld_check_load,
 3626 
 3627         .mpo_mbuf_copy_label = biba_copy_label,
 3628         .mpo_mbuf_destroy_label = biba_destroy_label,
 3629         .mpo_mbuf_init_label = biba_init_label_waitcheck,
 3630 
 3631         .mpo_mount_check_stat = biba_mount_check_stat,
 3632         .mpo_mount_create = biba_mount_create,
 3633         .mpo_mount_destroy_label = biba_destroy_label,
 3634         .mpo_mount_init_label = biba_init_label,
 3635 
 3636         .mpo_netinet_arp_send = biba_netinet_arp_send,
 3637         .mpo_netinet_firewall_reply = biba_netinet_firewall_reply,
 3638         .mpo_netinet_firewall_send = biba_netinet_firewall_send,
 3639         .mpo_netinet_fragment = biba_netinet_fragment,
 3640         .mpo_netinet_icmp_reply = biba_netinet_icmp_reply,
 3641         .mpo_netinet_igmp_send = biba_netinet_igmp_send,
 3642 
 3643         .mpo_netinet6_nd6_send = biba_netinet6_nd6_send,
 3644 
 3645         .mpo_pipe_check_ioctl = biba_pipe_check_ioctl,
 3646         .mpo_pipe_check_poll = biba_pipe_check_poll,
 3647         .mpo_pipe_check_read = biba_pipe_check_read,
 3648         .mpo_pipe_check_relabel = biba_pipe_check_relabel,
 3649         .mpo_pipe_check_stat = biba_pipe_check_stat,
 3650         .mpo_pipe_check_write = biba_pipe_check_write,
 3651         .mpo_pipe_copy_label = biba_copy_label,
 3652         .mpo_pipe_create = biba_pipe_create,
 3653         .mpo_pipe_destroy_label = biba_destroy_label,
 3654         .mpo_pipe_externalize_label = biba_externalize_label,
 3655         .mpo_pipe_init_label = biba_init_label,
 3656         .mpo_pipe_internalize_label = biba_internalize_label,
 3657         .mpo_pipe_relabel = biba_pipe_relabel,
 3658 
 3659         .mpo_posixsem_check_getvalue = biba_posixsem_check_rdonly,
 3660         .mpo_posixsem_check_open = biba_posixsem_check_openunlink,
 3661         .mpo_posixsem_check_post = biba_posixsem_check_write,
 3662         .mpo_posixsem_check_setmode = biba_posixsem_check_setmode,
 3663         .mpo_posixsem_check_setowner = biba_posixsem_check_setowner,
 3664         .mpo_posixsem_check_stat = biba_posixsem_check_rdonly,
 3665         .mpo_posixsem_check_unlink = biba_posixsem_check_openunlink,
 3666         .mpo_posixsem_check_wait = biba_posixsem_check_write,
 3667         .mpo_posixsem_create = biba_posixsem_create,
 3668         .mpo_posixsem_destroy_label = biba_destroy_label,
 3669         .mpo_posixsem_init_label = biba_init_label,
 3670 
 3671         .mpo_posixshm_check_mmap = biba_posixshm_check_mmap,
 3672         .mpo_posixshm_check_open = biba_posixshm_check_open,
 3673         .mpo_posixshm_check_read = biba_posixshm_check_read,
 3674         .mpo_posixshm_check_setmode = biba_posixshm_check_setmode,
 3675         .mpo_posixshm_check_setowner = biba_posixshm_check_setowner,
 3676         .mpo_posixshm_check_stat = biba_posixshm_check_stat,
 3677         .mpo_posixshm_check_truncate = biba_posixshm_check_truncate,
 3678         .mpo_posixshm_check_unlink = biba_posixshm_check_unlink,
 3679         .mpo_posixshm_check_write = biba_posixshm_check_write,
 3680         .mpo_posixshm_create = biba_posixshm_create,
 3681         .mpo_posixshm_destroy_label = biba_destroy_label,
 3682         .mpo_posixshm_init_label = biba_init_label,
 3683 
 3684         .mpo_priv_check = biba_priv_check,
 3685 
 3686         .mpo_proc_check_debug = biba_proc_check_debug,
 3687         .mpo_proc_check_sched = biba_proc_check_sched,
 3688         .mpo_proc_check_signal = biba_proc_check_signal,
 3689 
 3690         .mpo_socket_check_deliver = biba_socket_check_deliver,
 3691         .mpo_socket_check_relabel = biba_socket_check_relabel,
 3692         .mpo_socket_check_visible = biba_socket_check_visible,
 3693         .mpo_socket_copy_label = biba_copy_label,
 3694         .mpo_socket_create = biba_socket_create,
 3695         .mpo_socket_create_mbuf = biba_socket_create_mbuf,
 3696         .mpo_socket_destroy_label = biba_destroy_label,
 3697         .mpo_socket_externalize_label = biba_externalize_label,
 3698         .mpo_socket_init_label = biba_init_label_waitcheck,
 3699         .mpo_socket_internalize_label = biba_internalize_label,
 3700         .mpo_socket_newconn = biba_socket_newconn,
 3701         .mpo_socket_relabel = biba_socket_relabel,
 3702 
 3703         .mpo_socketpeer_destroy_label = biba_destroy_label,
 3704         .mpo_socketpeer_externalize_label = biba_externalize_label,
 3705         .mpo_socketpeer_init_label = biba_init_label_waitcheck,
 3706         .mpo_socketpeer_set_from_mbuf = biba_socketpeer_set_from_mbuf,
 3707         .mpo_socketpeer_set_from_socket = biba_socketpeer_set_from_socket,
 3708 
 3709         .mpo_syncache_create = biba_syncache_create,
 3710         .mpo_syncache_create_mbuf = biba_syncache_create_mbuf,
 3711         .mpo_syncache_destroy_label = biba_destroy_label,
 3712         .mpo_syncache_init_label = biba_init_label_waitcheck,
 3713 
 3714         .mpo_system_check_acct = biba_system_check_acct,
 3715         .mpo_system_check_auditctl = biba_system_check_auditctl,
 3716         .mpo_system_check_auditon = biba_system_check_auditon,
 3717         .mpo_system_check_swapoff = biba_system_check_swapoff,
 3718         .mpo_system_check_swapon = biba_system_check_swapon,
 3719         .mpo_system_check_sysctl = biba_system_check_sysctl,
 3720 
 3721         .mpo_sysvmsg_cleanup = biba_sysvmsg_cleanup,
 3722         .mpo_sysvmsg_create = biba_sysvmsg_create,
 3723         .mpo_sysvmsg_destroy_label = biba_destroy_label,
 3724         .mpo_sysvmsg_init_label = biba_init_label,
 3725 
 3726         .mpo_sysvmsq_check_msgrcv = biba_sysvmsq_check_msgrcv,
 3727         .mpo_sysvmsq_check_msgrmid = biba_sysvmsq_check_msgrmid,
 3728         .mpo_sysvmsq_check_msqget = biba_sysvmsq_check_msqget,
 3729         .mpo_sysvmsq_check_msqsnd = biba_sysvmsq_check_msqsnd,
 3730         .mpo_sysvmsq_check_msqrcv = biba_sysvmsq_check_msqrcv,
 3731         .mpo_sysvmsq_check_msqctl = biba_sysvmsq_check_msqctl,
 3732         .mpo_sysvmsq_cleanup = biba_sysvmsq_cleanup,
 3733         .mpo_sysvmsq_create = biba_sysvmsq_create,
 3734         .mpo_sysvmsq_destroy_label = biba_destroy_label,
 3735         .mpo_sysvmsq_init_label = biba_init_label,
 3736 
 3737         .mpo_sysvsem_check_semctl = biba_sysvsem_check_semctl,
 3738         .mpo_sysvsem_check_semget = biba_sysvsem_check_semget,
 3739         .mpo_sysvsem_check_semop = biba_sysvsem_check_semop,
 3740         .mpo_sysvsem_cleanup = biba_sysvsem_cleanup,
 3741         .mpo_sysvsem_create = biba_sysvsem_create,
 3742         .mpo_sysvsem_destroy_label = biba_destroy_label,
 3743         .mpo_sysvsem_init_label = biba_init_label,
 3744 
 3745         .mpo_sysvshm_check_shmat = biba_sysvshm_check_shmat,
 3746         .mpo_sysvshm_check_shmctl = biba_sysvshm_check_shmctl,
 3747         .mpo_sysvshm_check_shmget = biba_sysvshm_check_shmget,
 3748         .mpo_sysvshm_cleanup = biba_sysvshm_cleanup,
 3749         .mpo_sysvshm_create = biba_sysvshm_create,
 3750         .mpo_sysvshm_destroy_label = biba_destroy_label,
 3751         .mpo_sysvshm_init_label = biba_init_label,
 3752 
 3753         .mpo_vnode_associate_extattr = biba_vnode_associate_extattr,
 3754         .mpo_vnode_associate_singlelabel = biba_vnode_associate_singlelabel,
 3755         .mpo_vnode_check_access = biba_vnode_check_open,
 3756         .mpo_vnode_check_chdir = biba_vnode_check_chdir,
 3757         .mpo_vnode_check_chroot = biba_vnode_check_chroot,
 3758         .mpo_vnode_check_create = biba_vnode_check_create,
 3759         .mpo_vnode_check_deleteacl = biba_vnode_check_deleteacl,
 3760         .mpo_vnode_check_deleteextattr = biba_vnode_check_deleteextattr,
 3761         .mpo_vnode_check_exec = biba_vnode_check_exec,
 3762         .mpo_vnode_check_getacl = biba_vnode_check_getacl,
 3763         .mpo_vnode_check_getextattr = biba_vnode_check_getextattr,
 3764         .mpo_vnode_check_link = biba_vnode_check_link,
 3765         .mpo_vnode_check_listextattr = biba_vnode_check_listextattr,
 3766         .mpo_vnode_check_lookup = biba_vnode_check_lookup,
 3767         .mpo_vnode_check_mmap = biba_vnode_check_mmap,
 3768         .mpo_vnode_check_open = biba_vnode_check_open,
 3769         .mpo_vnode_check_poll = biba_vnode_check_poll,
 3770         .mpo_vnode_check_read = biba_vnode_check_read,
 3771         .mpo_vnode_check_readdir = biba_vnode_check_readdir,
 3772         .mpo_vnode_check_readlink = biba_vnode_check_readlink,
 3773         .mpo_vnode_check_relabel = biba_vnode_check_relabel,
 3774         .mpo_vnode_check_rename_from = biba_vnode_check_rename_from,
 3775         .mpo_vnode_check_rename_to = biba_vnode_check_rename_to,
 3776         .mpo_vnode_check_revoke = biba_vnode_check_revoke,
 3777         .mpo_vnode_check_setacl = biba_vnode_check_setacl,
 3778         .mpo_vnode_check_setextattr = biba_vnode_check_setextattr,
 3779         .mpo_vnode_check_setflags = biba_vnode_check_setflags,
 3780         .mpo_vnode_check_setmode = biba_vnode_check_setmode,
 3781         .mpo_vnode_check_setowner = biba_vnode_check_setowner,
 3782         .mpo_vnode_check_setutimes = biba_vnode_check_setutimes,
 3783         .mpo_vnode_check_stat = biba_vnode_check_stat,
 3784         .mpo_vnode_check_unlink = biba_vnode_check_unlink,
 3785         .mpo_vnode_check_write = biba_vnode_check_write,
 3786         .mpo_vnode_create_extattr = biba_vnode_create_extattr,
 3787         .mpo_vnode_copy_label = biba_copy_label,
 3788         .mpo_vnode_destroy_label = biba_destroy_label,
 3789         .mpo_vnode_externalize_label = biba_externalize_label,
 3790         .mpo_vnode_init_label = biba_init_label,
 3791         .mpo_vnode_internalize_label = biba_internalize_label,
 3792         .mpo_vnode_relabel = biba_vnode_relabel,
 3793         .mpo_vnode_setlabel_extattr = biba_vnode_setlabel_extattr,
 3794 };
 3795 
 3796 MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba",
 3797     MPC_LOADTIME_FLAG_NOTLATE, &biba_slot);

Cache object: 756ca43d77720b5fce6687e7eb5a0899


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