The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/security/mac/mac_cred.c

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    1 /*-
    2  * Copyright (c) 1999-2002, 2008-2009 Robert N. M. Watson
    3  * Copyright (c) 2001 Ilmar S. Habibulin
    4  * Copyright (c) 2001-2003 Networks Associates Technology, Inc.
    5  * Copyright (c) 2005 Samy Al Bahra
    6  * Copyright (c) 2006 SPARTA, Inc.
    7  * Copyright (c) 2008 Apple Inc.
    8  * All rights reserved.
    9  *
   10  * This software was developed by Robert Watson and Ilmar Habibulin for the
   11  * TrustedBSD Project.
   12  *
   13  * This software was developed for the FreeBSD Project in part by Network
   14  * Associates Laboratories, the Security Research Division of Network
   15  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
   16  * as part of the DARPA CHATS research program.
   17  *
   18  * This software was enhanced by SPARTA ISSO under SPAWAR contract
   19  * N66001-04-C-6019 ("SEFOS").
   20  *
   21  * This software was developed at the University of Cambridge Computer
   22  * Laboratory with support from a grant from Google, Inc. 
   23  *
   24  * Redistribution and use in source and binary forms, with or without
   25  * modification, are permitted provided that the following conditions
   26  * are met:
   27  * 1. Redistributions of source code must retain the above copyright
   28  *    notice, this list of conditions and the following disclaimer.
   29  * 2. Redistributions in binary form must reproduce the above copyright
   30  *    notice, this list of conditions and the following disclaimer in the
   31  *    documentation and/or other materials provided with the distribution.
   32  *
   33  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   34  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   35  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   36  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   37  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   38  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   39  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   41  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   42  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   43  * SUCH DAMAGE.
   44  */
   45 
   46 #include <sys/cdefs.h>
   47 __FBSDID("$FreeBSD: releng/9.0/sys/security/mac/mac_cred.c 191731 2009-05-01 21:05:40Z rwatson $");
   48 
   49 #include "opt_kdtrace.h"
   50 #include "opt_mac.h"
   51 
   52 #include <sys/param.h>
   53 #include <sys/condvar.h>
   54 #include <sys/imgact.h>
   55 #include <sys/kernel.h>
   56 #include <sys/lock.h>
   57 #include <sys/malloc.h>
   58 #include <sys/mutex.h>
   59 #include <sys/mac.h>
   60 #include <sys/proc.h>
   61 #include <sys/sbuf.h>
   62 #include <sys/sdt.h>
   63 #include <sys/systm.h>
   64 #include <sys/vnode.h>
   65 #include <sys/mount.h>
   66 #include <sys/file.h>
   67 #include <sys/namei.h>
   68 #include <sys/sysctl.h>
   69 
   70 #include <vm/vm.h>
   71 #include <vm/pmap.h>
   72 #include <vm/vm_map.h>
   73 #include <vm/vm_object.h>
   74 
   75 #include <security/mac/mac_framework.h>
   76 #include <security/mac/mac_internal.h>
   77 #include <security/mac/mac_policy.h>
   78 
   79 struct label *
   80 mac_cred_label_alloc(void)
   81 {
   82         struct label *label;
   83 
   84         label = mac_labelzone_alloc(M_WAITOK);
   85         MAC_POLICY_PERFORM(cred_init_label, label);
   86         return (label);
   87 }
   88 
   89 void
   90 mac_cred_init(struct ucred *cred)
   91 {
   92 
   93         if (mac_labeled & MPC_OBJECT_CRED)
   94                 cred->cr_label = mac_cred_label_alloc();
   95         else
   96                 cred->cr_label = NULL;
   97 }
   98 
   99 void
  100 mac_cred_label_free(struct label *label)
  101 {
  102 
  103         MAC_POLICY_PERFORM_NOSLEEP(cred_destroy_label, label);
  104         mac_labelzone_free(label);
  105 }
  106 
  107 void
  108 mac_cred_destroy(struct ucred *cred)
  109 {
  110 
  111         if (cred->cr_label != NULL) {
  112                 mac_cred_label_free(cred->cr_label);
  113                 cred->cr_label = NULL;
  114         }
  115 }
  116 
  117 /*
  118  * When a thread becomes an NFS server daemon, its credential may need to be
  119  * updated to reflect this so that policies can recognize when file system
  120  * operations originate from the network.
  121  *
  122  * At some point, it would be desirable if the credential used for each NFS
  123  * RPC could be set based on the RPC context (i.e., source system, etc) to
  124  * provide more fine-grained access control.
  125  */
  126 void
  127 mac_cred_associate_nfsd(struct ucred *cred)
  128 {
  129 
  130         MAC_POLICY_PERFORM_NOSLEEP(cred_associate_nfsd, cred);
  131 }
  132 
  133 /*
  134  * Initialize MAC label for the first kernel process, from which other kernel
  135  * processes and threads are spawned.
  136  */
  137 void
  138 mac_cred_create_swapper(struct ucred *cred)
  139 {
  140 
  141         MAC_POLICY_PERFORM_NOSLEEP(cred_create_swapper, cred);
  142 }
  143 
  144 /*
  145  * Initialize MAC label for the first userland process, from which other
  146  * userland processes and threads are spawned.
  147  */
  148 void
  149 mac_cred_create_init(struct ucred *cred)
  150 {
  151 
  152         MAC_POLICY_PERFORM_NOSLEEP(cred_create_init, cred);
  153 }
  154 
  155 int
  156 mac_cred_externalize_label(struct label *label, char *elements,
  157     char *outbuf, size_t outbuflen)
  158 {
  159         int error;
  160 
  161         MAC_POLICY_EXTERNALIZE(cred, label, elements, outbuf, outbuflen);
  162 
  163         return (error);
  164 }
  165 
  166 int
  167 mac_cred_internalize_label(struct label *label, char *string)
  168 {
  169         int error;
  170 
  171         MAC_POLICY_INTERNALIZE(cred, label, string);
  172 
  173         return (error);
  174 }
  175 
  176 /*
  177  * When a new process is created, its label must be initialized.  Generally,
  178  * this involves inheritence from the parent process, modulo possible deltas.
  179  * This function allows that processing to take place.
  180  */
  181 void
  182 mac_cred_copy(struct ucred *src, struct ucred *dest)
  183 {
  184 
  185         MAC_POLICY_PERFORM_NOSLEEP(cred_copy_label, src->cr_label,
  186             dest->cr_label);
  187 }
  188 
  189 /*
  190  * When the subject's label changes, it may require revocation of privilege
  191  * to mapped objects.  This can't be done on-the-fly later with a unified
  192  * buffer cache.
  193  */
  194 void
  195 mac_cred_relabel(struct ucred *cred, struct label *newlabel)
  196 {
  197 
  198         MAC_POLICY_PERFORM_NOSLEEP(cred_relabel, cred, newlabel);
  199 }
  200 
  201 MAC_CHECK_PROBE_DEFINE2(cred_check_relabel, "struct ucred *",
  202     "struct label *");
  203 
  204 int
  205 mac_cred_check_relabel(struct ucred *cred, struct label *newlabel)
  206 {
  207         int error;
  208 
  209         MAC_POLICY_CHECK_NOSLEEP(cred_check_relabel, cred, newlabel);
  210         MAC_CHECK_PROBE2(cred_check_relabel, error, cred, newlabel);
  211 
  212         return (error);
  213 }
  214 
  215 MAC_CHECK_PROBE_DEFINE2(cred_check_setuid, "struct ucred *", "uid_t");
  216 
  217 int
  218 mac_cred_check_setuid(struct ucred *cred, uid_t uid)
  219 {
  220         int error;
  221 
  222         MAC_POLICY_CHECK_NOSLEEP(cred_check_setuid, cred, uid);
  223         MAC_CHECK_PROBE2(cred_check_setuid, error, cred, uid);
  224 
  225         return (error);
  226 }
  227 
  228 MAC_CHECK_PROBE_DEFINE2(cred_check_seteuid, "struct ucred *", "uid_t");
  229 
  230 int
  231 mac_cred_check_seteuid(struct ucred *cred, uid_t euid)
  232 {
  233         int error;
  234 
  235         MAC_POLICY_CHECK_NOSLEEP(cred_check_seteuid, cred, euid);
  236         MAC_CHECK_PROBE2(cred_check_seteuid, error, cred, euid);
  237 
  238         return (error);
  239 }
  240 
  241 MAC_CHECK_PROBE_DEFINE2(cred_check_setgid, "struct ucred *", "gid_t");
  242 
  243 int
  244 mac_cred_check_setgid(struct ucred *cred, gid_t gid)
  245 {
  246         int error;
  247 
  248         MAC_POLICY_CHECK_NOSLEEP(cred_check_setgid, cred, gid);
  249         MAC_CHECK_PROBE2(cred_check_setgid, error, cred, gid);
  250 
  251         return (error);
  252 }
  253 
  254 MAC_CHECK_PROBE_DEFINE2(cred_check_setegid, "struct ucred *", "gid_t");
  255 
  256 int
  257 mac_cred_check_setegid(struct ucred *cred, gid_t egid)
  258 {
  259         int error;
  260 
  261         MAC_POLICY_CHECK_NOSLEEP(cred_check_setegid, cred, egid);
  262         MAC_CHECK_PROBE2(cred_check_setegid, error, cred, egid);
  263 
  264         return (error);
  265 }
  266 
  267 MAC_CHECK_PROBE_DEFINE3(cred_check_setgroups, "struct ucred *", "int",
  268     "gid_t *");
  269 
  270 int
  271 mac_cred_check_setgroups(struct ucred *cred, int ngroups, gid_t *gidset)
  272 {
  273         int error;
  274 
  275         MAC_POLICY_CHECK_NOSLEEP(cred_check_setgroups, cred, ngroups, gidset);
  276         MAC_CHECK_PROBE3(cred_check_setgroups, error, cred, ngroups, gidset);
  277 
  278         return (error);
  279 }
  280 
  281 MAC_CHECK_PROBE_DEFINE3(cred_check_setreuid, "struct ucred *", "uid_t",
  282     "uid_t");
  283 
  284 int
  285 mac_cred_check_setreuid(struct ucred *cred, uid_t ruid, uid_t euid)
  286 {
  287         int error;
  288 
  289         MAC_POLICY_CHECK_NOSLEEP(cred_check_setreuid, cred, ruid, euid);
  290         MAC_CHECK_PROBE3(cred_check_setreuid, error, cred, ruid, euid);
  291 
  292         return (error);
  293 }
  294 
  295 MAC_CHECK_PROBE_DEFINE3(cred_check_setregid, "struct ucred *", "gid_t",
  296     "gid_t");
  297 
  298 int
  299 mac_cred_check_setregid(struct ucred *cred, gid_t rgid, gid_t egid)
  300 {
  301         int error;
  302 
  303         MAC_POLICY_CHECK_NOSLEEP(cred_check_setregid, cred, rgid, egid);
  304         MAC_CHECK_PROBE3(cred_check_setregid, error, cred, rgid, egid);
  305 
  306         return (error);
  307 }
  308 
  309 MAC_CHECK_PROBE_DEFINE4(cred_check_setresuid, "struct ucred *", "uid_t",
  310     "uid_t", "uid_t");
  311 
  312 int
  313 mac_cred_check_setresuid(struct ucred *cred, uid_t ruid, uid_t euid,
  314     uid_t suid)
  315 {
  316         int error;
  317 
  318         MAC_POLICY_CHECK_NOSLEEP(cred_check_setresuid, cred, ruid, euid, suid);
  319         MAC_CHECK_PROBE4(cred_check_setresuid, error, cred, ruid, euid,
  320             suid);
  321 
  322         return (error);
  323 }
  324 
  325 MAC_CHECK_PROBE_DEFINE4(cred_check_setresgid, "struct ucred *", "gid_t",
  326     "gid_t", "gid_t");
  327 
  328 int
  329 mac_cred_check_setresgid(struct ucred *cred, gid_t rgid, gid_t egid,
  330     gid_t sgid)
  331 {
  332         int error;
  333 
  334         MAC_POLICY_CHECK_NOSLEEP(cred_check_setresgid, cred, rgid, egid, sgid);
  335         MAC_CHECK_PROBE4(cred_check_setresgid, error, cred, rgid, egid,
  336             sgid);
  337 
  338         return (error);
  339 }
  340 
  341 MAC_CHECK_PROBE_DEFINE2(cred_check_visible, "struct ucred *",
  342     "struct ucred *");
  343 
  344 int
  345 mac_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
  346 {
  347         int error;
  348 
  349         MAC_POLICY_CHECK_NOSLEEP(cred_check_visible, cr1, cr2);
  350         MAC_CHECK_PROBE2(cred_check_visible, error, cr1, cr2);
  351 
  352         return (error);
  353 }

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