126 lines
3.3 KiB
C
126 lines
3.3 KiB
C
/*-
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* Copyright (c) 2008-2011 Robert N. M. Watson
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* Copyright (c) 2010-2011 Jonathan Anderson
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* All rights reserved.
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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 OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* FreeBSD kernel capability facility.
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*
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* Currently, this file implements only capability mode; capabilities
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* (rights-refined file descriptors) will follow.
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*
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*/
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#include "opt_capabilities.h"
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/capability.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/sysproto.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/ucred.h>
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#include <security/audit/audit.h>
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#include <vm/uma.h>
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#include <vm/vm.h>
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#ifdef CAPABILITIES
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FEATURE(security_capabilities, "Capsicum Capability Mode");
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/*
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* We don't currently have any MIB entries for sysctls, but we do expose
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* security.capabilities so that it's easy to tell if options CAPABILITIES is
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* compiled into the kernel.
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*/
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SYSCTL_NODE(_security, OID_AUTO, capabilities, CTLFLAG_RW, 0, "Capsicum");
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/*
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* System call to enter capability mode for the process.
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*/
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int
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cap_enter(struct thread *td, struct cap_enter_args *uap)
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{
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struct ucred *newcred, *oldcred;
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struct proc *p;
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if (IN_CAPABILITY_MODE(td))
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return (0);
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newcred = crget();
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p = td->td_proc;
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PROC_LOCK(p);
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oldcred = p->p_ucred;
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crcopy(newcred, oldcred);
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newcred->cr_flags |= CRED_FLAG_CAPMODE;
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p->p_ucred = newcred;
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PROC_UNLOCK(p);
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crfree(oldcred);
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return (0);
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}
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/*
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* System call to query whether the process is in capability mode.
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*/
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int
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cap_getmode(struct thread *td, struct cap_getmode_args *uap)
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{
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u_int i;
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i = (IN_CAPABILITY_MODE(td)) ? 1 : 0;
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return (copyout(&i, uap->modep, sizeof(i)));
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}
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#else /* !CAPABILITIES */
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int
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cap_enter(struct thread *td, struct cap_enter_args *uap)
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{
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return (ENOSYS);
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}
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int
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cap_getmode(struct thread *td, struct cap_getmode_args *uap)
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{
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return (ENOSYS);
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}
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#endif /* CAPABILITIES */
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