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/*
* Convert ZFS/NFSv4 acls to NT acls and vice versa.
*
* Copyright (C) Jiri Sasek, 2007
* based on the foobar.c module which is copyrighted by Volker Lendecke
*
* Many thanks to Axel Apitz for help to fix the special ace's handling
* issues.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "includes.h"
#include "nfs4_acls.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_VFS
#define ZFSACL_MODULE_NAME "zfsacl"
/* zfs_get_nt_acl()
* read the local file's acls and return it in NT form
* using the NFSv4 format conversion
*/
static size_t zfs_get_nt_acl(struct files_struct *fsp, uint32 security_info,
struct security_descriptor **ppdesc)
{
int naces, i;
ace_t *acebuf;
SMB4ACL_T *pacl;
TALLOC_CTX *mem_ctx;
/* read the number of file aces */
if((naces = acl(fsp->fsp_name, ACE_GETACLCNT, 0, NULL)) == -1) {
if(errno == ENOSYS) {
DEBUG(9, ("acl(ACE_GETACLCNT, %s): Operation is not supported on the filesystem where the file reside"));
} else {
DEBUG(9, ("acl(ACE_GETACLCNT, %s): %s ", fsp->fsp_name,
strerror(errno)));
}
return 0;
}
/* allocate the field of ZFS aces */
mem_ctx = talloc_tos();
acebuf = (ace_t *) talloc_size(mem_ctx, sizeof(ace_t)*naces);
if(acebuf == NULL) {
errno = ENOMEM;
return 0;
}
/* read the aces into the field */
if(acl(fsp->fsp_name, ACE_GETACL, naces, acebuf) < 0) {
DEBUG(9, ("acl(ACE_GETACL, %s): %s ", fsp->fsp_name,
strerror(errno)));
return 0;
}
/* create SMB4ACL data */
if((pacl = smb_create_smb4acl()) == NULL) return 0;
for(i=0; i<naces; i++) {
SMB_ACE4PROP_T aceprop;
aceprop.aceType = (uint32) acebuf[i].a_type;
aceprop.aceFlags = (uint32) acebuf[i].a_flags;
aceprop.aceMask = (uint32) acebuf[i].a_access_mask;
aceprop.who.id = (uint32) acebuf[i].a_who;
if(aceprop.aceFlags & ACE_OWNER) {
aceprop.flags = SMB_ACE4_ID_SPECIAL;
aceprop.who.special_id = SMB_ACE4_WHO_OWNER;
} else if(aceprop.aceFlags & ACE_GROUP) {
aceprop.flags = SMB_ACE4_ID_SPECIAL;
aceprop.who.special_id = SMB_ACE4_WHO_GROUP;
} else if(aceprop.aceFlags & ACE_EVERYONE) {
aceprop.flags = SMB_ACE4_ID_SPECIAL;
aceprop.who.special_id = SMB_ACE4_WHO_EVERYONE;
} else {
aceprop.flags = 0;
}
if(smb_add_ace4(pacl, &aceprop) == NULL) return 0;
}
return smb_get_nt_acl_nfs4(fsp, security_info, ppdesc, pacl);
}
/* call-back function processing the NT acl -> ZFS acl using NFSv4 conv. */
static BOOL zfs_process_smbacl(files_struct *fsp, SMB4ACL_T *smbacl)
{
int naces = smb_get_naces(smbacl), i;
ace_t *acebuf;
SMB4ACE_T *smbace;
TALLOC_CTX *mem_ctx;
/* allocate the field of ZFS aces */
mem_ctx = talloc_tos();
acebuf = (ace_t *) talloc_size(mem_ctx, sizeof(ace_t)*naces);
if(acebuf == NULL) {
errno = ENOMEM;
return False;
}
/* handle all aces */
for(smbace = smb_first_ace4(smbacl), i = 0;
smbace!=NULL;
smbace = smb_next_ace4(smbace), i++) {
SMB_ACE4PROP_T *aceprop = smb_get_ace4(smbace);
acebuf[i].a_type = aceprop->aceType;
acebuf[i].a_flags = aceprop->aceFlags;
acebuf[i].a_access_mask = aceprop->aceMask;
acebuf[i].a_who = aceprop->who.id;
if(aceprop->flags & SMB_ACE4_ID_SPECIAL) {
switch(aceprop->who.special_id) {
case SMB_ACE4_WHO_EVERYONE:
acebuf[i].a_flags |= ACE_EVERYONE;
break;
case SMB_ACE4_WHO_OWNER:
acebuf[i].a_flags |= ACE_OWNER;
break;
case SMB_ACE4_WHO_GROUP:
acebuf[i].a_flags |= ACE_GROUP;
break;
default:
DEBUG(8, ("unsupported special_id %d\n", \
aceprop->who.special_id));
continue; /* don't add it !!! */
}
}
}
SMB_ASSERT(i == naces);
/* store acl */
if(acl(fsp->fsp_name, ACE_SETACL, naces, acebuf)) {
if(errno == ENOSYS) {
DEBUG(9, ("acl(ACE_SETACL, %s): Operation is not supported on the filesystem where the file reside"));
} else {
DEBUG(9, ("acl(ACE_SETACL, %s): %s ", fsp->fsp_name,
strerror(errno)));
}
return 0;
}
return True;
}
/* zfs_set_nt_acl()
* set the local file's acls obtaining it in NT form
* using the NFSv4 format conversion
*/
static NTSTATUS zfs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
uint32 security_info_sent,
struct security_descriptor *psd)
{
return smb_set_nt_acl_nfs4(fsp, security_info_sent, psd,
zfs_process_smbacl);
}
static size_t zfsacl_fget_nt_acl(struct vfs_handle_struct *handle,
struct files_struct *fsp,
int fd, uint32 security_info,
struct security_descriptor **ppdesc)
{
return zfs_get_nt_acl(fsp, security_info, ppdesc);
}
static size_t zfsacl_get_nt_acl(struct vfs_handle_struct *handle,
struct files_struct *fsp,
const char *name, uint32 security_info,
struct security_descriptor **ppdesc)
{
return zfs_get_nt_acl(fsp, security_info, ppdesc);
}
static NTSTATUS zfsacl_fset_nt_acl(vfs_handle_struct *handle,
files_struct *fsp,
int fd, uint32 security_info_sent,
SEC_DESC *psd)
{
return zfs_set_nt_acl(handle, fsp, security_info_sent, psd);
}
static NTSTATUS zfsacl_set_nt_acl(vfs_handle_struct *handle,
files_struct *fsp,
const char *name, uint32 security_info_sent,
SEC_DESC *psd)
{
return zfs_set_nt_acl(handle, fsp, security_info_sent, psd);
}
/* VFS operations structure */
static vfs_op_tuple zfsacl_ops[] = {
{SMB_VFS_OP(zfsacl_fget_nt_acl), SMB_VFS_OP_FGET_NT_ACL,
SMB_VFS_LAYER_OPAQUE},
{SMB_VFS_OP(zfsacl_get_nt_acl), SMB_VFS_OP_GET_NT_ACL,
SMB_VFS_LAYER_OPAQUE},
{SMB_VFS_OP(zfsacl_fset_nt_acl), SMB_VFS_OP_FSET_NT_ACL,
SMB_VFS_LAYER_OPAQUE},
{SMB_VFS_OP(zfsacl_set_nt_acl), SMB_VFS_OP_SET_NT_ACL,
SMB_VFS_LAYER_OPAQUE},
{SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
};
/* != 0 if this module will be compiled as static */
#define STATIC 0
#if STATIC
NTSTATUS vfs_zfsacl_init(void);
#else
NTSTATUS init_module(void);
#endif
NTSTATUS
#if STATIC
vfs_zfsacl_init
#else
init_module
#endif
(void)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "zfsacl",
zfsacl_ops);
}
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