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_priv.c

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    1 /*-
    2  * Copyright (c) 2006 nCircle Network Security, Inc.
    3  * Copyright (c) 2009 Robert N. M. Watson
    4  * All rights reserved.
    5  *
    6  * This software was developed by Robert N. M. Watson for the TrustedBSD
    7  * Project under contract to nCircle Network Security, Inc.
    8  *
    9  * This software was developed at the University of Cambridge Computer
   10  * Laboratory with support from a grant from Google, Inc.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY,
   25  * INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
   27  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   28  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   29  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   30  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   31  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   32  */
   33 
   34 /*
   35  * MAC checks for system privileges.
   36  */
   37 
   38 #include "sys/cdefs.h"
   39 __FBSDID("$FreeBSD: releng/10.1/sys/security/mac/mac_priv.c 228448 2011-12-12 23:29:32Z attilio $");
   40 
   41 #include "opt_kdtrace.h"
   42 #include "opt_mac.h"
   43 
   44 #include <sys/param.h>
   45 #include <sys/kernel.h>
   46 #include <sys/priv.h>
   47 #include <sys/sdt.h>
   48 #include <sys/module.h>
   49 
   50 #include <security/mac/mac_framework.h>
   51 #include <security/mac/mac_internal.h>
   52 #include <security/mac/mac_policy.h>
   53 
   54 /*
   55  * The MAC Framework interacts with kernel privilege checks in two ways: it
   56  * may restrict the granting of privilege to a subject, and it may grant
   57  * additional privileges to the subject.  Policies may implement none, one,
   58  * or both of these entry points.  Restriction of privilege by any policy
   59  * always overrides granting of privilege by any policy or other privilege
   60  * mechanism.  See kern_priv.c:priv_check_cred() for details of the
   61  * composition.
   62  */
   63 
   64 MAC_CHECK_PROBE_DEFINE2(priv_check, "struct ucred *", "int");
   65 
   66 /*
   67  * Restrict access to a privilege for a credential.  Return failure if any
   68  * policy denies access.
   69  */
   70 int
   71 mac_priv_check(struct ucred *cred, int priv)
   72 {
   73         int error;
   74 
   75         MAC_POLICY_CHECK_NOSLEEP(priv_check, cred, priv);
   76         MAC_CHECK_PROBE2(priv_check, error, cred, priv);
   77 
   78         return (error);
   79 }
   80 
   81 MAC_GRANT_PROBE_DEFINE2(priv_grant, "struct ucred *", "int");
   82 
   83 /*
   84  * Grant access to a privilege for a credential.  Return success if any
   85  * policy grants access.
   86  */
   87 int
   88 mac_priv_grant(struct ucred *cred, int priv)
   89 {
   90         int error;
   91 
   92         MAC_POLICY_GRANT_NOSLEEP(priv_grant, cred, priv);
   93         MAC_GRANT_PROBE2(priv_grant, error, cred, priv);
   94 
   95         return (error);
   96 }

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