280 lines
7.1 KiB
C
280 lines
7.1 KiB
C
/*-
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* Copyright (c) 1999, 2000 Robert N. M. Watson
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* All rights reserved.
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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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* $FreeBSD$
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*/
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/*
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* Generic routines to support file system ACLs, at a syntactic level
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* Semantics are the responsibility of the underlying file system
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*/
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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/vnode.h>
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#include <sys/lock.h>
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#include <sys/namei.h>
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#include <sys/file.h>
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#include <sys/proc.h>
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#include <sys/sysent.h>
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#include <sys/errno.h>
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#include <sys/stat.h>
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#include <sys/acl.h>
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static MALLOC_DEFINE(M_ACL, "acl", "access control list");
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static int vacl_set_acl(struct proc *p, struct vnode *vp, acl_type_t type,
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struct acl *aclp);
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static int vacl_get_acl(struct proc *p, struct vnode *vp, acl_type_t type,
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struct acl *aclp);
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static int vacl_aclcheck(struct proc *p, struct vnode *vp, acl_type_t type,
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struct acl *aclp);
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/*
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* These calls wrap the real vnode operations, and are called by the
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* syscall code once the syscall has converted the path or file
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* descriptor to a vnode (unlocked). The aclp pointer is assumed
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* still to point to userland, so this should not be consumed within
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* the kernel except by syscall code. Other code should directly
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* 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 proc *p, 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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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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VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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error = VOP_SETACL(vp, type, &inkernacl, p->p_ucred, p);
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VOP_UNLOCK(vp, 0, p);
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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 proc *p, 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, p, p->p_ucred, LEASE_WRITE);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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error = VOP_GETACL(vp, type, &inkernelacl, p->p_ucred, p);
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VOP_UNLOCK(vp, 0, p);
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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 proc *p, struct vnode *vp, acl_type_t type)
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{
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int error;
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VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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error = VOP_SETACL(vp, ACL_TYPE_DEFAULT, 0, p->p_ucred, p);
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VOP_UNLOCK(vp, 0, p);
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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 proc *p, 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, p->p_ucred, p);
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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.
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* Don't need to lock, as the vacl_ code will get/release any locks
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* 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 proc *p, struct __acl_get_file_args *uap)
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{
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struct nameidata nd;
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int error;
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/* what flags are required here -- possible not LOCKLEAF? */
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
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error = namei(&nd);
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if (error)
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return(error);
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error = vacl_get_acl(p, nd.ni_vp, SCARG(uap, type), SCARG(uap, aclp));
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NDFREE(&nd, 0);
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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 proc *p, struct __acl_set_file_args *uap)
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{
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struct nameidata nd;
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int error;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
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error = namei(&nd);
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if (error)
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return(error);
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error = vacl_set_acl(p, nd.ni_vp, SCARG(uap, type), SCARG(uap, aclp));
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NDFREE(&nd, 0);
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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 proc *p, struct __acl_get_fd_args *uap)
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{
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struct file *fp;
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int error;
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error = getvnode(p->p_fd, SCARG(uap, filedes), &fp);
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if (error)
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return(error);
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return vacl_get_acl(p, (struct vnode *)fp->f_data, SCARG(uap, type),
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SCARG(uap, aclp));
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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 proc *p, struct __acl_set_fd_args *uap)
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{
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struct file *fp;
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int error;
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error = getvnode(p->p_fd, SCARG(uap, filedes), &fp);
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if (error)
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return(error);
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return vacl_set_acl(p, (struct vnode *)fp->f_data, SCARG(uap, type),
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SCARG(uap, aclp));
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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 proc *p, struct __acl_delete_file_args *uap)
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{
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struct nameidata nd;
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int error;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
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error = namei(&nd);
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if (error)
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return(error);
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error = vacl_delete(p, nd.ni_vp, SCARG(uap, type));
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NDFREE(&nd, 0);
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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 proc *p, struct __acl_delete_fd_args *uap)
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{
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struct file *fp;
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int error;
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error = getvnode(p->p_fd, SCARG(uap, filedes), &fp);
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if (error)
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return(error);
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error = vacl_delete(p, (struct vnode *)fp->f_data, SCARG(uap, type));
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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 proc *p, struct __acl_aclcheck_file_args *uap)
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{
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struct nameidata nd;
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int error;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
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error = namei(&nd);
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if (error)
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return(error);
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error = vacl_aclcheck(p, nd.ni_vp, SCARG(uap, type), SCARG(uap, aclp));
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NDFREE(&nd, 0);
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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 proc *p, struct __acl_aclcheck_fd_args *uap)
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{
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struct file *fp;
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int error;
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error = getvnode(p->p_fd, SCARG(uap, filedes), &fp);
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if (error)
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return(error);
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return vacl_aclcheck(p, (struct vnode *)fp->f_data, SCARG(uap, type),
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SCARG(uap, aclp));
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}
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