upload tizen1.0 sourceHEADmaster2.0alpha

1 files changed, 745 insertions, 0 deletions

diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
new file mode 100644
index 00000000..85d7cf7f
--- /dev/null
+++ b/fs/cifs/cifsacl.c
@@ -0,0 +1,745 @@
+/*
+ *   fs/cifs/cifsacl.c
+ *
+ *   Copyright (C) International Business Machines  Corp., 2007,2008
+ *   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 <linux/slab.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}, {__constant_cpu_to_le32(11), 0, 0, 0, 0} }, "net-users"},
+	{{1, 1, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(18), 0, 0, 0, 0} }, "sys"},
+	{{1, 2, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(32), __constant_cpu_to_le32(544), 0, 0, 0} }, "root"},
+	{{1, 2, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(32), __constant_cpu_to_le32(545), 0, 0, 0} }, "users"},
+	{{1, 2, {0, 0, 0, 0, 0, 5}, {__constant_cpu_to_le32(32), __constant_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, 1}, {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(const struct cifs_sid *ctsid, const 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 */
+}
+
+
+/* copy ntsd, owner sid, and group sid from a security descriptor to another */
+static void copy_sec_desc(const struct cifs_ntsd *pntsd,
+				struct cifs_ntsd *pnntsd, __u32 sidsoffset)
+{
+	int i;
+
+	struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
+	struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr;
+
+	/* copy security descriptor control portion */
+	pnntsd->revision = pntsd->revision;
+	pnntsd->type = pntsd->type;
+	pnntsd->dacloffset = cpu_to_le32(sizeof(struct cifs_ntsd));
+	pnntsd->sacloffset = 0;
+	pnntsd->osidoffset = cpu_to_le32(sidsoffset);
+	pnntsd->gsidoffset = cpu_to_le32(sidsoffset + sizeof(struct cifs_sid));
+
+	/* copy owner sid */
+	owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
+				le32_to_cpu(pntsd->osidoffset));
+	nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset);
+
+	nowner_sid_ptr->revision = owner_sid_ptr->revision;
+	nowner_sid_ptr->num_subauth = owner_sid_ptr->num_subauth;
+	for (i = 0; i < 6; i++)
+		nowner_sid_ptr->authority[i] = owner_sid_ptr->authority[i];
+	for (i = 0; i < 5; i++)
+		nowner_sid_ptr->sub_auth[i] = owner_sid_ptr->sub_auth[i];
+
+	/* copy group sid */
+	group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
+				le32_to_cpu(pntsd->gsidoffset));
+	ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset +
+					sizeof(struct cifs_sid));
+
+	ngroup_sid_ptr->revision = group_sid_ptr->revision;
+	ngroup_sid_ptr->num_subauth = group_sid_ptr->num_subauth;
+	for (i = 0; i < 6; i++)
+		ngroup_sid_ptr->authority[i] = group_sid_ptr->authority[i];
+	for (i = 0; i < 5; i++)
+		ngroup_sid_ptr->sub_auth[i] = group_sid_ptr->sub_auth[i];
+
+	return;
+}
+
+
+/*
+   change posix mode to reflect permissions
+   pmode is the existing mode (we only want to overwrite part of this
+   bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007
+*/
+static void access_flags_to_mode(__le32 ace_flags, int type, umode_t *pmode,
+				 umode_t *pbits_to_set)
+{
+	__u32 flags = le32_to_cpu(ace_flags);
+	/* the order of ACEs is important.  The canonical order is to begin with
+	   DENY entries followed by ALLOW, otherwise an allow entry could be
+	   encountered first, making the subsequent deny entry like "dead code"
+	   which would be superflous since Windows stops when a match is made
+	   for the operation you are trying to perform for your user */
+
+	/* For deny ACEs we change the mask so that subsequent allow access
+	   control entries do not turn on the bits we are denying */
+	if (type == ACCESS_DENIED) {
+		if (flags & GENERIC_ALL)
+			*pbits_to_set &= ~S_IRWXUGO;
+
+		if ((flags & GENERIC_WRITE) ||
+			((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS))
+			*pbits_to_set &= ~S_IWUGO;
+		if ((flags & GENERIC_READ) ||
+			((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS))
+			*pbits_to_set &= ~S_IRUGO;
+		if ((flags & GENERIC_EXECUTE) ||
+			((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS))
+			*pbits_to_set &= ~S_IXUGO;
+		return;
+	} else if (type != ACCESS_ALLOWED) {
+		cERROR(1, "unknown access control type %d", type);
+		return;
+	}
+	/* else ACCESS_ALLOWED type */
+
+	if (flags & GENERIC_ALL) {
+		*pmode |= (S_IRWXUGO & (*pbits_to_set));
+		cFYI(DBG2, "all perms");
+		return;
+	}
+	if ((flags & GENERIC_WRITE) ||
+			((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS))
+		*pmode |= (S_IWUGO & (*pbits_to_set));
+	if ((flags & GENERIC_READ) ||
+			((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS))
+		*pmode |= (S_IRUGO & (*pbits_to_set));
+	if ((flags & GENERIC_EXECUTE) ||
+			((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS))
+		*pmode |= (S_IXUGO & (*pbits_to_set));
+
+	cFYI(DBG2, "access flags 0x%x mode now 0x%x", flags, *pmode);
+	return;
+}
+
+/*
+   Generate access flags to reflect permissions mode is the existing mode.
+   This function is called for every ACE in the DACL whose SID matches
+   with either owner or group or everyone.
+*/
+
+static void mode_to_access_flags(umode_t mode, umode_t bits_to_use,
+				__u32 *pace_flags)
+{
+	/* reset access mask */
+	*pace_flags = 0x0;
+
+	/* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */
+	mode &= bits_to_use;
+
+	/* check for R/W/X UGO since we do not know whose flags
+	   is this but we have cleared all the bits sans RWX for
+	   either user or group or other as per bits_to_use */
+	if (mode & S_IRUGO)
+		*pace_flags |= SET_FILE_READ_RIGHTS;
+	if (mode & S_IWUGO)
+		*pace_flags |= SET_FILE_WRITE_RIGHTS;
+	if (mode & S_IXUGO)
+		*pace_flags |= SET_FILE_EXEC_RIGHTS;
+
+	cFYI(DBG2, "mode: 0x%x, access flags now 0x%x", mode, *pace_flags);
+	return;
+}
+
+static __u16 fill_ace_for_sid(struct cifs_ace *pntace,
+			const struct cifs_sid *psid, __u64 nmode, umode_t bits)
+{
+	int i;
+	__u16 size = 0;
+	__u32 access_req = 0;
+
+	pntace->type = ACCESS_ALLOWED;
+	pntace->flags = 0x0;
+	mode_to_access_flags(nmode, bits, &access_req);
+	if (!access_req)
+		access_req = SET_MINIMUM_RIGHTS;
+	pntace->access_req = cpu_to_le32(access_req);
+
+	pntace->sid.revision = psid->revision;
+	pntace->sid.num_subauth = psid->num_subauth;
+	for (i = 0; i < 6; i++)
+		pntace->sid.authority[i] = psid->authority[i];
+	for (i = 0; i < psid->num_subauth; i++)
+		pntace->sid.sub_auth[i] = psid->sub_auth[i];
+
+	size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4);
+	pntace->size = cpu_to_le16(size);
+
+	return size;
+}
+
+
+#ifdef CONFIG_CIFS_DEBUG2
+static void dump_ace(struct cifs_ace *pace, char *end_of_acl)
+{
+	int num_subauth;
+
+	/* validate that we do not go past end of acl */
+
+	if (le16_to_cpu(pace->size) < 16) {
+		cERROR(1, "ACE too small %d", le16_to_cpu(pace->size));
+		return;
+	}
+
+	if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) {
+		cERROR(1, "ACL too small to parse ACE");
+		return;
+	}
+
+	num_subauth = pace->sid.num_subauth;
+	if (num_subauth) {
+		int i;
+		cFYI(1, "ACE revision %d num_auth %d type %d flags %d size %d",
+			pace->sid.revision, pace->sid.num_subauth, pace->type,
+			pace->flags, le16_to_cpu(pace->size));
+		for (i = 0; i < num_subauth; ++i) {
+			cFYI(1, "ACE sub_auth[%d]: 0x%x", i,
+				le32_to_cpu(pace->sid.sub_auth[i]));
+		}
+
+		/* BB add length check to make sure that we do not have huge
+			num auths and therefore go off the end */
+	}
+
+	return;
+}
+#endif
+
+
+static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
+		       struct cifs_sid *pownersid, struct cifs_sid *pgrpsid,
+		       struct cifs_fattr *fattr)
+{
+	int i;
+	int num_aces = 0;
+	int acl_size;
+	char *acl_base;
+	struct cifs_ace **ppace;
+
+	/* BB need to add parm so we can store the SID BB */
+
+	if (!pdacl) {
+		/* no DACL in the security descriptor, set
+		   all the permissions for user/group/other */
+		fattr->cf_mode |= S_IRWXUGO;
+		return;
+	}
+
+	/* 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;
+	}
+
+	cFYI(DBG2, "DACL revision %d size %d num aces %d",
+		le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size),
+		le32_to_cpu(pdacl->num_aces));
+
+	/* reset rwx permissions for user/group/other.
+	   Also, if num_aces is 0 i.e. DACL has no ACEs,
+	   user/group/other have no permissions */
+	fattr->cf_mode &= ~(S_IRWXUGO);
+
+	acl_base = (char *)pdacl;
+	acl_size = sizeof(struct cifs_acl);
+
+	num_aces = le32_to_cpu(pdacl->num_aces);
+	if (num_aces  > 0) {
+		umode_t user_mask = S_IRWXU;
+		umode_t group_mask = S_IRWXG;
+		umode_t other_mask = S_IRWXO;
+
+		ppace = kmalloc(num_aces * sizeof(struct cifs_ace *),
+				GFP_KERNEL);
+
+		for (i = 0; i < num_aces; ++i) {
+			ppace[i] = (struct cifs_ace *) (acl_base + acl_size);
+#ifdef CONFIG_CIFS_DEBUG2
+			dump_ace(ppace[i], end_of_acl);
+#endif
+			if (compare_sids(&(ppace[i]->sid), pownersid))
+				access_flags_to_mode(ppace[i]->access_req,
+						     ppace[i]->type,
+						     &fattr->cf_mode,
+						     &user_mask);
+			if (compare_sids(&(ppace[i]->sid), pgrpsid))
+				access_flags_to_mode(ppace[i]->access_req,
+						     ppace[i]->type,
+						     &fattr->cf_mode,
+						     &group_mask);
+			if (compare_sids(&(ppace[i]->sid), &sid_everyone))
+				access_flags_to_mode(ppace[i]->access_req,
+						     ppace[i]->type,
+						     &fattr->cf_mode,
+						     &other_mask);
+
+/*			memcpy((void *)(&(cifscred->aces[i])),
+				(void *)ppace[i],
+				sizeof(struct cifs_ace)); */
+
+			acl_base = (char *)ppace[i];
+			acl_size = le16_to_cpu(ppace[i]->size);
+		}
+
+		kfree(ppace);
+	}
+
+	return;
+}
+
+
+static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid,
+			struct cifs_sid *pgrpsid, __u64 nmode)
+{
+	u16 size = 0;
+	struct cifs_acl *pnndacl;
+
+	pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl));
+
+	size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size),
+					pownersid, nmode, S_IRWXU);
+	size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size),
+					pgrpsid, nmode, S_IRWXG);
+	size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size),
+					 &sid_everyone, nmode, S_IRWXO);
+
+	pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl));
+	pndacl->num_aces = cpu_to_le32(3);
+
+	return 0;
+}
+
+
+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 - sid must be at least 8
+	   bytes long (assuming no sub-auths - e.g. the null SID */
+	if (end_of_acl < (char *)psid + 8) {
+		cERROR(1, "ACL too small to parse SID %p", psid);
+		return -EINVAL;
+	}
+
+	if (psid->num_subauth) {
+#ifdef CONFIG_CIFS_DEBUG2
+		int i;
+		cFYI(1, "SID revision %d num_auth %d",
+			psid->revision, psid->num_subauth);
+
+		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 */
+static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len,
+			  struct cifs_fattr *fattr)
+{
+	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;
+	__u32 dacloffset;
+
+	if (pntsd == NULL)
+		return -EIO;
+
+	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));
+	dacloffset = le32_to_cpu(pntsd->dacloffset);
+	dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset);
+	cFYI(DBG2, "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), dacloffset);
+/*	cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */
+	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;
+
+	if (dacloffset)
+		parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr,
+			   group_sid_ptr, fattr);
+	else
+		cFYI(1, "no ACL"); /* BB grant all or default perms? */
+
+/*	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;
+}
+
+
+/* Convert permission bits from mode to equivalent CIFS ACL */
+static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd,
+				struct inode *inode, __u64 nmode)
+{
+	int rc = 0;
+	__u32 dacloffset;
+	__u32 ndacloffset;
+	__u32 sidsoffset;
+	struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
+	struct cifs_acl *dacl_ptr = NULL;  /* no need for SACL ptr */
+	struct cifs_acl *ndacl_ptr = NULL; /* no need for SACL ptr */
+
+	if ((inode == NULL) || (pntsd == NULL) || (pnntsd == NULL))
+		return -EIO;
+
+	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));
+
+	dacloffset = le32_to_cpu(pntsd->dacloffset);
+	dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset);
+
+	ndacloffset = sizeof(struct cifs_ntsd);
+	ndacl_ptr = (struct cifs_acl *)((char *)pnntsd + ndacloffset);
+	ndacl_ptr->revision = dacl_ptr->revision;
+	ndacl_ptr->size = 0;
+	ndacl_ptr->num_aces = 0;
+
+	rc = set_chmod_dacl(ndacl_ptr, owner_sid_ptr, group_sid_ptr, nmode);
+
+	sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size);
+
+	/* copy security descriptor control portion and owner and group sid */
+	copy_sec_desc(pntsd, pnntsd, sidsoffset);
+
+	return rc;
+}
+
+static struct cifs_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb,
+		__u16 fid, u32 *pacllen)
+{
+	struct cifs_ntsd *pntsd = NULL;
+	int xid, rc;
+
+	xid = GetXid();
+	rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);
+	FreeXid(xid);
+
+
+	cFYI(1, "GetCIFSACL rc = %d ACL len %d", rc, *pacllen);
+	return pntsd;
+}
+
+static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb,
+		const char *path, u32 *pacllen)
+{
+	struct cifs_ntsd *pntsd = NULL;
+	int oplock = 0;
+	int xid, rc;
+	__u16 fid;
+
+	xid = GetXid();
+
+	rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, READ_CONTROL, 0,
+			 &fid, &oplock, NULL, cifs_sb->local_nls,
+			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+	if (rc) {
+		cERROR(1, "Unable to open file to get ACL");
+		goto out;
+	}
+
+	rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);
+	cFYI(1, "GetCIFSACL rc = %d ACL len %d", rc, *pacllen);
+
+	CIFSSMBClose(xid, cifs_sb->tcon, fid);
+ out:
+	FreeXid(xid);
+	return pntsd;
+}
+
+/* Retrieve an ACL from the server */
+static struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb,
+				      struct inode *inode, const char *path,
+				      u32 *pacllen)
+{
+	struct cifs_ntsd *pntsd = NULL;
+	struct cifsFileInfo *open_file = NULL;
+
+	if (inode)
+		open_file = find_readable_file(CIFS_I(inode));
+	if (!open_file)
+		return get_cifs_acl_by_path(cifs_sb, path, pacllen);
+
+	pntsd = get_cifs_acl_by_fid(cifs_sb, open_file->netfid, pacllen);
+	cifsFileInfo_put(open_file);
+	return pntsd;
+}
+
+static int set_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb, __u16 fid,
+		struct cifs_ntsd *pnntsd, u32 acllen)
+{
+	int xid, rc;
+
+	xid = GetXid();
+	rc = CIFSSMBSetCIFSACL(xid, cifs_sb->tcon, fid, pnntsd, acllen);
+	FreeXid(xid);
+
+	cFYI(DBG2, "SetCIFSACL rc = %d", rc);
+	return rc;
+}
+
+static int set_cifs_acl_by_path(struct cifs_sb_info *cifs_sb, const char *path,
+		struct cifs_ntsd *pnntsd, u32 acllen)
+{
+	int oplock = 0;
+	int xid, rc;
+	__u16 fid;
+
+	xid = GetXid();
+
+	rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, WRITE_DAC, 0,
+			 &fid, &oplock, NULL, cifs_sb->local_nls,
+			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+	if (rc) {
+		cERROR(1, "Unable to open file to set ACL");
+		goto out;
+	}
+
+	rc = CIFSSMBSetCIFSACL(xid, cifs_sb->tcon, fid, pnntsd, acllen);
+	cFYI(DBG2, "SetCIFSACL rc = %d", rc);
+
+	CIFSSMBClose(xid, cifs_sb->tcon, fid);
+ out:
+	FreeXid(xid);
+	return rc;
+}
+
+/* Set an ACL on the server */
+static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
+				struct inode *inode, const char *path)
+{
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct cifsFileInfo *open_file;
+	int rc;
+
+	cFYI(DBG2, "set ACL for %s from mode 0x%x", path, inode->i_mode);
+
+	open_file = find_readable_file(CIFS_I(inode));
+	if (!open_file)
+		return set_cifs_acl_by_path(cifs_sb, path, pnntsd, acllen);
+
+	rc = set_cifs_acl_by_fid(cifs_sb, open_file->netfid, pnntsd, acllen);
+	cifsFileInfo_put(open_file);
+	return rc;
+}
+
+/* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */
+void
+cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
+		  struct inode *inode, const char *path, const __u16 *pfid)
+{
+	struct cifs_ntsd *pntsd = NULL;
+	u32 acllen = 0;
+	int rc = 0;
+
+	cFYI(DBG2, "converting ACL to mode for %s", path);
+
+	if (pfid)
+		pntsd = get_cifs_acl_by_fid(cifs_sb, *pfid, &acllen);
+	else
+		pntsd = get_cifs_acl(cifs_sb, inode, path, &acllen);
+
+	/* if we can retrieve the ACL, now parse Access Control Entries, ACEs */
+	if (pntsd)
+		rc = parse_sec_desc(pntsd, acllen, fattr);
+	if (rc)
+		cFYI(1, "parse sec desc failed rc = %d", rc);
+
+	kfree(pntsd);
+	return;
+}
+
+/* Convert mode bits to an ACL so we can update the ACL on the server */
+int mode_to_acl(struct inode *inode, const char *path, __u64 nmode)
+{
+	int rc = 0;
+	__u32 secdesclen = 0;
+	struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */
+	struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */
+
+	cFYI(DBG2, "set ACL from mode for %s", path);
+
+	/* Get the security descriptor */
+	pntsd = get_cifs_acl(CIFS_SB(inode->i_sb), inode, path, &secdesclen);
+
+	/* Add three ACEs for owner, group, everyone getting rid of
+	   other ACEs as chmod disables ACEs and set the security descriptor */
+
+	if (pntsd) {
+		/* allocate memory for the smb header,
+		   set security descriptor request security descriptor
+		   parameters, and secuirty descriptor itself */
+
+		secdesclen = secdesclen < DEFSECDESCLEN ?
+					DEFSECDESCLEN : secdesclen;
+		pnntsd = kmalloc(secdesclen, GFP_KERNEL);
+		if (!pnntsd) {
+			cERROR(1, "Unable to allocate security descriptor");
+			kfree(pntsd);
+			return -ENOMEM;
+		}
+
+		rc = build_sec_desc(pntsd, pnntsd, inode, nmode);
+
+		cFYI(DBG2, "build_sec_desc rc: %d", rc);
+
+		if (!rc) {
+			/* Set the security descriptor */
+			rc = set_cifs_acl(pnntsd, secdesclen, inode, path);
+			cFYI(DBG2, "set_cifs_acl rc: %d", rc);
+		}
+
+		kfree(pnntsd);
+		kfree(pntsd);
+	}
+
+	return rc;
+}
+#endif /* CONFIG_CIFS_EXPERIMENTAL */