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/*-
* Copyright (c) 2008-2011 Robert N. M. Watson
* Copyright (c) 2010-2011 Jonathan Anderson
* All rights reserved.
*
* This software was developed at the University of Cambridge Computer
* Laboratory with support from a grant from Google, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* FreeBSD kernel capability facility.
*
* Currently, this file implements only capability mode; capabilities
* (rights-refined file descriptors) will follow.
*
*/
#include "opt_capabilities.h"
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/capability.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/sysproto.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/ucred.h>
#include <security/audit/audit.h>
#include <vm/uma.h>
#include <vm/vm.h>
#ifdef CAPABILITIES
FEATURE(security_capabilities, "Capsicum Capability Mode");
/*
* System call to enter capability mode for the process.
*/
int
cap_enter(struct thread *td, struct cap_enter_args *uap)
{
struct ucred *newcred, *oldcred;
struct proc *p;
if (IN_CAPABILITY_MODE(td))
return (0);
newcred = crget();
p = td->td_proc;
PROC_LOCK(p);
oldcred = p->p_ucred;
crcopy(newcred, oldcred);
newcred->cr_flags |= CRED_FLAG_CAPMODE;
p->p_ucred = newcred;
PROC_UNLOCK(p);
crfree(oldcred);
return (0);
}
/*
* System call to query whether the process is in capability mode.
*/
int
cap_getmode(struct thread *td, struct cap_getmode_args *uap)
{
u_int i;
i = (IN_CAPABILITY_MODE(td)) ? 1 : 0;
return (copyout(&i, uap->modep, sizeof(i)));
}
#else /* !CAPABILITIES */
int
cap_enter(struct thread *td, struct cap_enter_args *uap)
{
return (ENOSYS);
}
int
cap_getmode(struct thread *td, struct cap_getmode_args *uap)
{
return (ENOSYS);
}
#endif /* CAPABILITIES */
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