2087a58ca2
privilege grants so that dtrace can be more easily used to monitor the security decisions being generated by the MAC Framework following policy invocation. Successful access control checks will be reported by: mac_framework:kernel:<entrypoint>:mac_check_ok Failed access control checks will be reported by: mac_framework:kernel:<entrypoint>:mac_check_err Successful privilege grants will be reported by: mac_framework:kernel:priv_grant:mac_grant_ok Failed privilege grants will be reported by: mac_framework:kernel:priv_grant:mac_grant_err In all cases, the return value (always 0 for _ok, otherwise an errno for _err) will be reported via arg0 on the probe, and subsequent arguments will hold entrypoint-specific data, in a style similar to privilege tracing. Obtained from: TrustedBSD Project Sponsored by: Google, Inc.
97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
/*-
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* Copyright (c) 2006 nCircle Network Security, Inc.
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* Copyright (c) 2009 Robert N. M. Watson
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* All rights reserved.
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*
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* This software was developed by Robert N. M. Watson for the TrustedBSD
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* Project under contract to nCircle Network Security, Inc.
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*
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* This software was developed at the University of Cambridge Computer
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* Laboratory with support from a grant from Google, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY,
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* INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* MAC checks for system privileges.
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*/
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#include "sys/cdefs.h"
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__FBSDID("$FreeBSD$");
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#include "opt_kdtrace.h"
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/priv.h>
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#include <sys/sdt.h>
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#include <sys/module.h>
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#include <security/mac/mac_framework.h>
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#include <security/mac/mac_internal.h>
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#include <security/mac/mac_policy.h>
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/*
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* The MAC Framework interacts with kernel privilege checks in two ways: it
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* may restrict the granting of privilege to a subject, and it may grant
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* additional privileges to the subject. Policies may implement none, one,
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* or both of these entry points. Restriction of privilege by any policy
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* always overrides granting of privilege by any policy or other privilege
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* mechanism. See kern_priv.c:priv_check_cred() for details of the
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* composition.
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*/
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MAC_CHECK_PROBE_DEFINE2(priv_check, "struct ucred *", "int");
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/*
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* Restrict access to a privilege for a credential. Return failure if any
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* policy denies access.
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*/
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int
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mac_priv_check(struct ucred *cred, int priv)
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{
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int error;
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MAC_CHECK(priv_check, cred, priv);
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MAC_CHECK_PROBE2(priv_check, error, cred, priv);
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return (error);
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}
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MAC_GRANT_PROBE_DEFINE2(priv_grant, "struct ucred *", "int");
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/*
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* Grant access to a privilege for a credential. Return success if any
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* policy grants access.
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*/
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int
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mac_priv_grant(struct ucred *cred, int priv)
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{
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int error;
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MAC_GRANT(priv_grant, cred, priv);
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MAC_GRANT_PROBE2(priv_grant, error, cred, priv);
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return (error);
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}
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