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30d239bc4c
from Mac OS X Leopard--rationalize naming for entry points to
the following general forms:
mac_<object>_<method/action>
mac_<object>_check_<method/action>
The previous naming scheme was inconsistent and mostly
reversed from the new scheme. Also, make object types more
consistent and remove spaces from object types that contain
multiple parts ("posix_sem" -> "posixsem") to make mechanical
parsing easier. Introduce a new "netinet" object type for
certain IPv4/IPv6-related methods. Also simplify, slightly,
some entry point names.
All MAC policy modules will need to be recompiled, and modules
not updates as part of this commit will need to be modified to
conform to the new KPI.
Sponsored by: SPARTA (original patches against Mac OS X)
Obtained from: TrustedBSD Project, Apple Computer
432 lines
10 KiB
C
432 lines
10 KiB
C
/*-
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* Copyright (c) 1999-2006 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 Watson for the TrustedBSD Project.
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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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* Developed by the TrustedBSD Project.
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*
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* ACL system calls and other functions common across different ACL types.
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* Type-specific routines go into subr_acl_<type>.c.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/proc.h>
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#include <sys/sysent.h>
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#include <sys/acl.h>
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#include <security/mac/mac_framework.h>
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#include <vm/uma.h>
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uma_zone_t acl_zone;
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static int vacl_set_acl(struct thread *td, struct vnode *vp,
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acl_type_t type, struct acl *aclp);
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static int vacl_get_acl(struct thread *td, struct vnode *vp,
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acl_type_t type, struct acl *aclp);
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static int vacl_aclcheck(struct thread *td, struct vnode *vp,
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acl_type_t type, struct acl *aclp);
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/*
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* These calls wrap the real vnode operations, and are called by the syscall
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* code once the syscall has converted the path or file descriptor to a vnode
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* (unlocked). The aclp pointer is assumed still to point to userland, so
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* this should not be consumed within the kernel except by syscall code.
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* Other code should directly invoke VOP_{SET,GET}ACL.
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*/
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/*
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* Given a vnode, set its ACL.
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*/
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static int
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vacl_set_acl(struct thread *td, struct vnode *vp, acl_type_t type,
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struct acl *aclp)
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{
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struct acl inkernacl;
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struct mount *mp;
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int error;
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error = copyin(aclp, &inkernacl, sizeof(struct acl));
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if (error)
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return(error);
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error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
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if (error != 0)
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return (error);
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VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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#ifdef MAC
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error = mac_vnode_check_setacl(td->td_ucred, vp, type, &inkernacl);
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if (error != 0)
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goto out;
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#endif
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error = VOP_SETACL(vp, type, &inkernacl, td->td_ucred, td);
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#ifdef MAC
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out:
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#endif
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VOP_UNLOCK(vp, 0, td);
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vn_finished_write(mp);
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return(error);
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}
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/*
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* Given a vnode, get its ACL.
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*/
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static int
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vacl_get_acl(struct thread *td, struct vnode *vp, acl_type_t type,
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struct acl *aclp)
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{
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struct acl inkernelacl;
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int error;
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VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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#ifdef MAC
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error = mac_vnode_check_getacl(td->td_ucred, vp, type);
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if (error != 0)
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goto out;
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#endif
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error = VOP_GETACL(vp, type, &inkernelacl, td->td_ucred, td);
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#ifdef MAC
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out:
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#endif
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VOP_UNLOCK(vp, 0, td);
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if (error == 0)
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error = copyout(&inkernelacl, aclp, sizeof(struct acl));
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return (error);
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}
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/*
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* Given a vnode, delete its ACL.
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*/
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static int
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vacl_delete(struct thread *td, struct vnode *vp, acl_type_t type)
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{
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struct mount *mp;
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int error;
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error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
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if (error)
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return (error);
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VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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#ifdef MAC
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error = mac_vnode_check_deleteacl(td->td_ucred, vp, type);
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if (error)
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goto out;
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#endif
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error = VOP_SETACL(vp, type, 0, td->td_ucred, td);
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#ifdef MAC
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out:
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#endif
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VOP_UNLOCK(vp, 0, td);
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vn_finished_write(mp);
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return (error);
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}
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/*
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* Given a vnode, check whether an ACL is appropriate for it
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*/
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static int
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vacl_aclcheck(struct thread *td, struct vnode *vp, acl_type_t type,
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struct acl *aclp)
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{
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struct acl inkernelacl;
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int error;
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error = copyin(aclp, &inkernelacl, sizeof(struct acl));
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if (error)
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return(error);
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error = VOP_ACLCHECK(vp, type, &inkernelacl, td->td_ucred, td);
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return (error);
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}
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/*
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* syscalls -- convert the path/fd to a vnode, and call vacl_whatever. Don't
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* need to lock, as the vacl_ code will get/release any locks required.
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*/
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/*
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* Given a file path, get an ACL for it
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*/
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int
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__acl_get_file(struct thread *td, struct __acl_get_file_args *uap)
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{
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struct nameidata nd;
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int vfslocked, error;
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NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
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error = namei(&nd);
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vfslocked = NDHASGIANT(&nd);
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if (error == 0) {
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error = vacl_get_acl(td, nd.ni_vp, uap->type, uap->aclp);
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NDFREE(&nd, 0);
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}
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VFS_UNLOCK_GIANT(vfslocked);
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return (error);
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}
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/*
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* Given a file path, get an ACL for it; don't follow links.
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*/
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int
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__acl_get_link(struct thread *td, struct __acl_get_link_args *uap)
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{
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struct nameidata nd;
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int vfslocked, error;
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NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
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error = namei(&nd);
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vfslocked = NDHASGIANT(&nd);
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if (error == 0) {
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error = vacl_get_acl(td, nd.ni_vp, uap->type, uap->aclp);
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NDFREE(&nd, 0);
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}
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VFS_UNLOCK_GIANT(vfslocked);
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return (error);
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}
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/*
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* Given a file path, set an ACL for it.
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*/
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int
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__acl_set_file(struct thread *td, struct __acl_set_file_args *uap)
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{
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struct nameidata nd;
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int vfslocked, error;
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NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
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error = namei(&nd);
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vfslocked = NDHASGIANT(&nd);
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if (error == 0) {
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error = vacl_set_acl(td, nd.ni_vp, uap->type, uap->aclp);
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NDFREE(&nd, 0);
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}
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VFS_UNLOCK_GIANT(vfslocked);
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return (error);
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}
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/*
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* Given a file path, set an ACL for it; don't follow links.
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*/
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int
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__acl_set_link(struct thread *td, struct __acl_set_link_args *uap)
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{
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struct nameidata nd;
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int vfslocked, error;
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NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
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error = namei(&nd);
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vfslocked = NDHASGIANT(&nd);
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if (error == 0) {
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error = vacl_set_acl(td, nd.ni_vp, uap->type, uap->aclp);
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NDFREE(&nd, 0);
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}
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VFS_UNLOCK_GIANT(vfslocked);
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return (error);
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}
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/*
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* Given a file descriptor, get an ACL for it.
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*/
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int
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__acl_get_fd(struct thread *td, struct __acl_get_fd_args *uap)
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{
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struct file *fp;
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int vfslocked, error;
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error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
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if (error == 0) {
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vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
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error = vacl_get_acl(td, fp->f_vnode, uap->type, uap->aclp);
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fdrop(fp, td);
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VFS_UNLOCK_GIANT(vfslocked);
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}
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return (error);
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}
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/*
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* Given a file descriptor, set an ACL for it.
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*/
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int
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__acl_set_fd(struct thread *td, struct __acl_set_fd_args *uap)
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{
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struct file *fp;
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int vfslocked, error;
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error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
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if (error == 0) {
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vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
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error = vacl_set_acl(td, fp->f_vnode, uap->type, uap->aclp);
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fdrop(fp, td);
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VFS_UNLOCK_GIANT(vfslocked);
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}
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return (error);
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}
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/*
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* Given a file path, delete an ACL from it.
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*/
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int
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__acl_delete_file(struct thread *td, struct __acl_delete_file_args *uap)
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{
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struct nameidata nd;
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int vfslocked, error;
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NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
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error = namei(&nd);
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vfslocked = NDHASGIANT(&nd);
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if (error == 0) {
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error = vacl_delete(td, nd.ni_vp, uap->type);
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NDFREE(&nd, 0);
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}
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VFS_UNLOCK_GIANT(vfslocked);
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return (error);
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}
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/*
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* Given a file path, delete an ACL from it; don't follow links.
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*/
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int
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__acl_delete_link(struct thread *td, struct __acl_delete_link_args *uap)
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{
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struct nameidata nd;
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int vfslocked, error;
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NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
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error = namei(&nd);
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vfslocked = NDHASGIANT(&nd);
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if (error == 0) {
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error = vacl_delete(td, nd.ni_vp, uap->type);
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NDFREE(&nd, 0);
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}
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VFS_UNLOCK_GIANT(vfslocked);
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return (error);
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}
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/*
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* Given a file path, delete an ACL from it.
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*/
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int
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__acl_delete_fd(struct thread *td, struct __acl_delete_fd_args *uap)
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{
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struct file *fp;
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int vfslocked, error;
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error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
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if (error == 0) {
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vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
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error = vacl_delete(td, fp->f_vnode, uap->type);
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fdrop(fp, td);
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VFS_UNLOCK_GIANT(vfslocked);
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}
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return (error);
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}
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/*
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* Given a file path, check an ACL for it.
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*/
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int
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__acl_aclcheck_file(struct thread *td, struct __acl_aclcheck_file_args *uap)
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{
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struct nameidata nd;
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int vfslocked, error;
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NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
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error = namei(&nd);
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vfslocked = NDHASGIANT(&nd);
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if (error == 0) {
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error = vacl_aclcheck(td, nd.ni_vp, uap->type, uap->aclp);
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NDFREE(&nd, 0);
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}
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VFS_UNLOCK_GIANT(vfslocked);
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return (error);
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}
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/*
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* Given a file path, check an ACL for it; don't follow links.
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*/
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int
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__acl_aclcheck_link(struct thread *td, struct __acl_aclcheck_link_args *uap)
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{
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struct nameidata nd;
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int vfslocked, error;
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NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
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error = namei(&nd);
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vfslocked = NDHASGIANT(&nd);
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if (error == 0) {
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error = vacl_aclcheck(td, nd.ni_vp, uap->type, uap->aclp);
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NDFREE(&nd, 0);
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}
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VFS_UNLOCK_GIANT(vfslocked);
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return (error);
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}
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/*
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* Given a file descriptor, check an ACL for it.
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*/
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int
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__acl_aclcheck_fd(struct thread *td, struct __acl_aclcheck_fd_args *uap)
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{
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struct file *fp;
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int vfslocked, error;
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error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
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if (error == 0) {
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vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
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error = vacl_aclcheck(td, fp->f_vnode, uap->type, uap->aclp);
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fdrop(fp, td);
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VFS_UNLOCK_GIANT(vfslocked);
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}
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return (error);
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}
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/* ARGUSED */
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static void
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aclinit(void *dummy __unused)
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{
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acl_zone = uma_zcreate("ACL UMA zone", sizeof(struct acl),
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NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
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}
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SYSINIT(acls, SI_SUB_ACL, SI_ORDER_FIRST, aclinit, NULL)
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