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57b4252e45
namei(9). Based on the submission by rdivacky, sponsored by Google Summer of Code 2007 Reviewed by: rwatson, rdivacky Tested by: pho
433 lines
10 KiB
C
433 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/fcntl.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);
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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);
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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);
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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);
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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);
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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);
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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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