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/*
* fs/cifs/cifsacl.c
*
* Copyright (C) International Business Machines Corp., 2007
* Author(s): Steve French (sfrench@us.ibm.com)
*
* Contains the routines for mapping CIFS/NTFS ACLs
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/fs.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsacl.h"
#include "cifsproto.h"
#include "cifs_debug.h"
/* security id for everyone */
static const struct cifs_sid sid_everyone =
{1, 1, {0, 0, 0, 0, 0, 0}, {}};
/* group users */
static const struct cifs_sid sid_user =
{1, 2 , {0, 0, 0, 0, 0, 5}, {}};
static void parse_ace(struct cifs_ace * pace, char * end_of_acl)
{
int i;
int num_subauth;
__u32 *psub_auth;
/* validate that we do not go past end of acl */
if (end_of_acl < (char *)pace + sizeof(struct cifs_ace)) {
cERROR(1, ("ACL too small to parse ACE"));
return;
}
num_subauth = cpu_to_le32(pace->num_subauth);
if (num_subauth) {
psub_auth = (__u32 *)((char *)pace + sizeof(struct cifs_ace));
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("ACE revision %d num_subauth %d",
pace->revision, pace->num_subauth));
for (i = 0; i < num_subauth; ++i) {
cFYI(1, ("ACE sub_auth[%d]: 0x%x", i,
le32_to_cpu(psub_auth[i])));
}
/* BB add length check to make sure that we do not have huge
num auths and therefore go off the end */
cFYI(1, ("RID %d", le32_to_cpu(psub_auth[num_subauth-1])));
#endif
}
return;
}
static void parse_ntace(struct cifs_ntace * pntace, char * end_of_acl)
{
/* validate that we do not go past end of acl */
if (end_of_acl < (char *)pntace + sizeof(struct cifs_ntace)) {
cERROR(1, ("ACL too small to parse NT ACE"));
return;
}
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("NTACE type %d flags 0x%x size %d, access Req 0x%x",
pntace->type, pntace->flags, pntace->size,
pntace->access_req));
#endif
return;
}
static void parse_dacl(struct cifs_acl * pdacl, char * end_of_acl)
{
int i;
int num_aces = 0;
int acl_size;
char *acl_base;
struct cifs_ntace **ppntace;
struct cifs_ace **ppace;
/* BB need to add parm so we can store the SID BB */
/* validate that we do not go past end of acl */
if (end_of_acl < (char *)pdacl + pdacl->size) {
cERROR(1, ("ACL too small to parse DACL"));
return;
}
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("DACL revision %d size %d num aces %d",
pdacl->revision, pdacl->size, pdacl->num_aces));
#endif
acl_base = (char *)pdacl;
acl_size = sizeof(struct cifs_acl);
num_aces = cpu_to_le32(pdacl->num_aces);
if (num_aces > 0) {
ppntace = kmalloc(num_aces * sizeof(struct cifs_ntace *),
GFP_KERNEL);
ppace = kmalloc(num_aces * sizeof(struct cifs_ace *),
GFP_KERNEL);
/* cifscred->cecount = pdacl->num_aces;
cifscred->ntaces = kmalloc(num_aces *
sizeof(struct cifs_ntace *), GFP_KERNEL);
cifscred->aces = kmalloc(num_aces *
sizeof(struct cifs_ace *), GFP_KERNEL);*/
for (i = 0; i < num_aces; ++i) {
ppntace[i] = (struct cifs_ntace *)
(acl_base + acl_size);
ppace[i] = (struct cifs_ace *) ((char *)ppntace[i] +
sizeof(struct cifs_ntace));
parse_ntace(ppntace[i], end_of_acl);
parse_ace(ppace[i], end_of_acl);
/* memcpy((void *)(&(cifscred->ntaces[i])),
(void *)ppntace[i],
sizeof(struct cifs_ntace));
memcpy((void *)(&(cifscred->aces[i])),
(void *)ppace[i],
sizeof(struct cifs_ace)); */
acl_base = (char *)ppntace[i];
acl_size = cpu_to_le32(ppntace[i]->size);
}
kfree(ppace);
kfree(ppntace);
}
return;
}
static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
{
int i;
int num_subauth;
__u32 *psub_auth;
/* BB need to add parm so we can store the SID BB */
/* validate that we do not go past end of acl */
if (end_of_acl < (char *)psid + sizeof(struct cifs_sid)) {
cERROR(1, ("ACL too small to parse SID"));
return -EINVAL;
}
num_subauth = cpu_to_le32(psid->num_subauth);
if (num_subauth) {
psub_auth = (__u32 *)((char *)psid + sizeof(struct cifs_sid));
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("SID revision %d num_auth %d First subauth 0x%x",
psid->revision, psid->num_subauth, psid->sub_auth[0]));
for (i = 0; i < num_subauth; ++i) {
cFYI(1, ("SID sub_auth[%d]: 0x%x ", i,
le32_to_cpu(psub_auth[i])));
}
/* BB add length check to make sure that we do not have huge
num auths and therefore go off the end */
cFYI(1, ("RID 0x%x",
le32_to_cpu(psid->sub_auth[psid->num_subauth])));
#endif
}
return 0;
}
/* Convert CIFS ACL to POSIX form */
int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len)
{
int rc;
struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
struct cifs_acl *dacl_ptr; /* no need for SACL ptr */
char *end_of_acl = ((char *)pntsd) + acl_len;
owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
cpu_to_le32(pntsd->osidoffset));
group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
cpu_to_le32(pntsd->gsidoffset));
dacl_ptr = (struct cifs_acl *)((char *)pntsd +
cpu_to_le32(pntsd->dacloffset));
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("revision %d type 0x%x ooffset 0x%x goffset 0x%x "
"sacloffset 0x%x dacloffset 0x%x",
pntsd->revision, pntsd->type,
pntsd->osidoffset, pntsd->gsidoffset, pntsd->sacloffset,
pntsd->dacloffset));
#endif
rc = parse_sid(owner_sid_ptr, end_of_acl);
if (rc)
return rc;
rc = parse_sid(group_sid_ptr, end_of_acl);
if (rc)
return rc;
parse_dacl(dacl_ptr, end_of_acl);
/* cifscred->uid = owner_sid_ptr->rid;
cifscred->gid = group_sid_ptr->rid;
memcpy((void *)(&(cifscred->osid)), (void *)owner_sid_ptr,
sizeof (struct cifs_sid));
memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr,
sizeof (struct cifs_sid)); */
return (0);
}
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