/*
* 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"
#ifdef CONFIG_CIFS_EXPERIMENTAL
static struct cifs_wksid wksidarr[NUM_WK_SIDS] = {
{{1, 0, {0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0} }, "null user"},
{{1, 1, {0, 0, 0, 0, 0, 1}, {0, 0, 0, 0, 0} }, "nobody"},
{{1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(11), 0, 0, 0, 0} }, "net-users"},
{{1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(18), 0, 0, 0, 0} }, "sys"},
{{1, 2, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(32), cpu_to_le32(544), 0, 0, 0} }, "root"},
{{1, 2, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(32), cpu_to_le32(545), 0, 0, 0} }, "users"},
{{1, 2, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(32), cpu_to_le32(546), 0, 0, 0} }, "guest"}
};
/* 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}, {} };
int match_sid(struct cifs_sid *ctsid)
{
int i, j;
int num_subauth, num_sat, num_saw;
struct cifs_sid *cwsid;
if (!ctsid)
return (-1);
for (i = 0; i < NUM_WK_SIDS; ++i) {
cwsid = &(wksidarr[i].cifssid);
/* compare the revision */
if (ctsid->revision != cwsid->revision)
continue;
/* compare all of the six auth values */
for (j = 0; j < 6; ++j) {
if (ctsid->authority[j] != cwsid->authority[j])
break;
}
if (j < 6)
continue; /* all of the auth values did not match */
/* compare all of the subauth values if any */
num_sat = ctsid->num_subauth;
num_saw = cwsid->num_subauth;
num_subauth = num_sat < num_saw ? num_sat : num_saw;
if (num_subauth) {
for (j = 0; j < num_subauth; ++j) {
if (ctsid->sub_auth[j] != cwsid->sub_auth[j])
break;
}
if (j < num_subauth)
continue; /* all sub_auth values do not match */
}
cFYI(1, ("matching sid: %s\n", wksidarr[i].sidname));
return (0); /* sids compare/match */
}
cFYI(1, ("No matching sid"));
return (-1);
}
/* if the two SIDs (roughly equivalent to a UUID for a user or group) are
the same returns 1, if they do not match returns 0 */
int compare_sids(struct cifs_sid *ctsid, struct cifs_sid *cwsid)
{
int i;
int num_subauth, num_sat, num_saw;
if ((!ctsid) || (!cwsid))
return (0);
/* compare the revision */
if (ctsid->revision != cwsid->revision)
return (0);
/* compare all of the six auth values */
for (i = 0; i < 6; ++i) {
if (ctsid->authority[i] != cwsid->authority[i])
return (0);
}
/* compare all of the subauth values if any */
num_sat = ctsid->num_subauth;
num_saw = cwsid->num_subauth;
num_subauth = num_sat < num_saw ? num_sat : num_saw;
if (num_subauth) {
for (i = 0; i < num_subauth; ++i) {
if (ctsid->sub_auth[i] != cwsid->sub_auth[i])
return (0);
}
}
return (1); /* sids compare/match */
}
static void parse_ace(struct cifs_ace *pace, char *end_of_acl)
{
int num_subauth;
/* validate that we do not go past end of acl */
/* XXX this if statement can be removed
if (end_of_acl < (char *)pace + sizeof(struct cifs_ace)) {
cERROR(1, ("ACL too small to parse ACE"));
return;
} */
num_subauth = pace->num_subauth;
if (num_subauth) {
#ifdef CONFIG_CIFS_DEBUG2
int i;
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(pace->sub_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(pace->sub_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,
struct cifs_sid *pownersid, struct cifs_sid *pgrpsid)
{
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 + le16_to_cpu(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",
le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size),
le32_to_cpu(pdacl->num_aces)));
#endif
acl_base = (char *)pdacl;
acl_size = sizeof(struct cifs_acl);
num_aces = le32_to_cpu(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);
if (end_of_acl < ((char *)ppace[i] +
(le16_to_cpu(ppntace[i]->size) -
sizeof(struct cifs_ntace)))) {
cERROR(1, ("ACL too small to parse ACE"));
break;
} else
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 = le16_to_cpu(ppntace[i]->size);
}
kfree(ppace);
kfree(ppntace);
}
return;
}
static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
{
/* 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;
}
if (psid->num_subauth) {
#ifdef CONFIG_CIFS_DEBUG2
int i;
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 < psid->num_subauth; i++) {
cFYI(1, ("SID sub_auth[%d]: 0x%x ", i,
le32_to_cpu(psid->sub_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-1])));
#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 +
le32_to_cpu(pntsd->osidoffset));
group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
le32_to_cpu(pntsd->gsidoffset));
dacl_ptr = (struct cifs_acl *)((char *)pntsd +
le32_to_cpu(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, le32_to_cpu(pntsd->osidoffset),
le32_to_cpu(pntsd->gsidoffset),
le32_to_cpu(pntsd->sacloffset),
le32_to_cpu(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, owner_sid_ptr, group_sid_ptr);
/* 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);
}
#endif /* CONFIG_CIFS_EXPERIMENTAL */
