X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=fs%2Fcifs%2Fcifsacl.c;h=a7035bd18e4e4282ed4fcef9c22132c94c9e7f09;hb=f038ac8f9b9735358ef410d45f4cff1da810c1cb;hp=e8e56353f5a1c423b5e6e70f986bbb8b6a3f7a19;hpb=81f8320f624a785d77443ace83391d0fdee695f6;p=linux-2.6-omap-h63xx.git

diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index e8e56353f5a..a7035bd18e4 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -38,13 +38,13 @@ static struct cifs_wksid wksidarr[NUM_WK_SIDS] = {
 	{{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"}
-};
+	{{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}, {} };
+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}, {} };
@@ -97,7 +97,7 @@ int match_sid(struct cifs_sid *ctsid)
 
 /* 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 compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid)
 {
 	int i;
 	int num_subauth, num_sat, num_saw;
@@ -130,69 +130,228 @@ int compare_sids(struct cifs_sid *ctsid, struct cifs_sid *cwsid)
 }
 
 
-static void parse_ace(struct cifs_ace *pace, char *end_of_acl)
+/* 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] =
+				cpu_to_le32(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));
+#ifdef CONFIG_CIFS_DEBUG2
+		cFYI(1, ("all perms"));
+#endif
+		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));
+
+#ifdef CONFIG_CIFS_DEBUG2
+	cFYI(1, ("access flags 0x%x mode now 0x%x", flags, *pmode));
+#endif
+	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;
+
+#ifdef CONFIG_CIFS_DEBUG2
+	cFYI(1, ("mode: 0x%x, access flags now 0x%x", mode, *pace_flags));
+#endif
+	return;
+}
+
+static __le16 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 */
 
-	/* XXX this if statement can be removed
-	if (end_of_acl < (char *)pace + sizeof(struct cifs_ace)) {
+	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->num_subauth;
+	num_subauth = pace->sid.num_subauth;
 	if (num_subauth) {
-#ifdef CONFIG_CIFS_DEBUG2
 		int i;
-		cFYI(1, ("ACE revision %d num_subauth %d",
-			pace->revision, pace->num_subauth));
+		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->sub_auth[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 */
-
-		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)
+		       struct cifs_sid *pownersid, struct cifs_sid *pgrpsid,
+		       struct inode *inode)
 {
 	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 */
 
+	if (!pdacl) {
+		/* no DACL in the security descriptor, set
+		   all the permissions for user/group/other */
+		inode->i_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"));
@@ -205,72 +364,101 @@ static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
 		le32_to_cpu(pdacl->num_aces)));
 #endif
 
+	/* 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 */
+	inode->i_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) {
-		ppntace = kmalloc(num_aces * sizeof(struct cifs_ntace *),
-				GFP_KERNEL);
+		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);
 
 /*		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])),
+			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,
+						     &(inode->i_mode),
+						     &user_mask);
+			if (compare_sids(&(ppace[i]->sid), pgrpsid))
+				access_flags_to_mode(ppace[i]->access_req,
+						     ppace[i]->type,
+						     &(inode->i_mode),
+						     &group_mask);
+			if (compare_sids(&(ppace[i]->sid), &sid_everyone))
+				access_flags_to_mode(ppace[i]->access_req,
+						     ppace[i]->type,
+						     &(inode->i_mode),
+						     &other_mask);
+
+/*			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);
+			acl_base = (char *)ppace[i];
+			acl_size = le16_to_cpu(ppace[i]->size);
 		}
 
 		kfree(ppace);
-		kfree(ppntace);
 	}
 
 	return;
 }
 
 
-static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
+static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid,
+			struct cifs_sid *pgrpsid, __u64 nmode)
 {
+	__le16 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 = 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 */
-	if (end_of_acl < (char *)psid + sizeof(struct cifs_sid)) {
-		cERROR(1, ("ACL too small to parse SID"));
+	/* 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 First subauth 0x%x",
-			psid->revision, psid->num_subauth, psid->sub_auth[0]));
+		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,
@@ -289,27 +477,32 @@ static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
 
 
 /* Convert CIFS ACL to POSIX form */
-int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len)
+static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len,
+			  struct inode *inode)
 {
 	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 ((inode == NULL) || (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));
-	dacl_ptr = (struct cifs_acl *)((char *)pntsd +
-				le32_to_cpu(pntsd->dacloffset));
+	dacloffset = le32_to_cpu(pntsd->dacloffset);
+	dacl_ptr = (struct cifs_acl *)((char *)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)));
+		 le32_to_cpu(pntsd->sacloffset), dacloffset));
 #endif
+/*	cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */
 	rc = parse_sid(owner_sid_ptr, end_of_acl);
 	if (rc)
 		return rc;
@@ -318,16 +511,247 @@ int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len)
 	if (rc)
 		return rc;
 
-	parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, group_sid_ptr);
+	if (dacloffset)
+		parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr,
+			   group_sid_ptr, inode);
+	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));
+			sizeof(struct cifs_sid));
 	memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr,
-			sizeof (struct cifs_sid)); */
+			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,
+				int acl_len, 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);
+}
+
+
+/* Retrieve an ACL from the server */
+static struct cifs_ntsd *get_cifs_acl(u32 *pacllen, struct inode *inode,
+				       const char *path)
+{
+	struct cifsFileInfo *open_file;
+	int unlock_file = FALSE;
+	int xid;
+	int rc = -EIO;
+	__u16 fid;
+	struct super_block *sb;
+	struct cifs_sb_info *cifs_sb;
+	struct cifs_ntsd *pntsd = NULL;
+
+	cFYI(1, ("get mode from ACL for %s", path));
+
+	if (inode == NULL)
+		return NULL;
+
+	xid = GetXid();
+	open_file = find_readable_file(CIFS_I(inode));
+	sb = inode->i_sb;
+	if (sb == NULL) {
+		FreeXid(xid);
+		return NULL;
+	}
+	cifs_sb = CIFS_SB(sb);
+
+	if (open_file) {
+		unlock_file = TRUE;
+		fid = open_file->netfid;
+	} else {
+		int oplock = FALSE;
+		/* open file */
+		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 != 0) {
+			cERROR(1, ("Unable to open file to get ACL"));
+			FreeXid(xid);
+			return NULL;
+		}
+	}
+
+	rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);
+	cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, *pacllen));
+	if (unlock_file == TRUE)
+		atomic_dec(&open_file->wrtPending);
+	else
+		CIFSSMBClose(xid, cifs_sb->tcon, fid);
+
+	FreeXid(xid);
+	return pntsd;
+}
+
+/* Set an ACL on the server */
+static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
+				struct inode *inode, const char *path)
+{
+	struct cifsFileInfo *open_file;
+	int unlock_file = FALSE;
+	int xid;
+	int rc = -EIO;
+	__u16 fid;
+	struct super_block *sb;
+	struct cifs_sb_info *cifs_sb;
+
+#ifdef CONFIG_CIFS_DEBUG2
+	cFYI(1, ("set ACL for %s from mode 0x%x", path, inode->i_mode));
+#endif
+
+	if (!inode)
+		return (rc);
+
+	sb = inode->i_sb;
+	if (sb == NULL)
+		return (rc);
+
+	cifs_sb = CIFS_SB(sb);
+	xid = GetXid();
+
+	open_file = find_readable_file(CIFS_I(inode));
+	if (open_file) {
+		unlock_file = TRUE;
+		fid = open_file->netfid;
+	} else {
+		int oplock = FALSE;
+		/* open file */
+		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 != 0) {
+			cERROR(1, ("Unable to open file to set ACL"));
+			FreeXid(xid);
+			return (rc);
+		}
+	}
+
+	rc = CIFSSMBSetCIFSACL(xid, cifs_sb->tcon, fid, pnntsd, acllen);
+#ifdef CONFIG_CIFS_DEBUG2
+	cFYI(1, ("SetCIFSACL rc = %d", rc));
+#endif
+	if (unlock_file == TRUE)
+		atomic_dec(&open_file->wrtPending);
+	else
+		CIFSSMBClose(xid, cifs_sb->tcon, fid);
+
+	FreeXid(xid);
+
+	return (rc);
+}
+
+/* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */
+void acl_to_uid_mode(struct inode *inode, const char *path)
+{
+	struct cifs_ntsd *pntsd = NULL;
+	u32 acllen = 0;
+	int rc = 0;
+
+#ifdef CONFIG_CIFS_DEBUG2
+	cFYI(1, ("converting ACL to mode for %s", path));
+#endif
+	pntsd = get_cifs_acl(&acllen, inode, path);
+
+	/* if we can retrieve the ACL, now parse Access Control Entries, ACEs */
+	if (pntsd)
+		rc = parse_sec_desc(pntsd, acllen, inode);
+	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 acllen = 0;
+	struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */
+	struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */
+
+#ifdef CONFIG_CIFS_DEBUG2
+	cFYI(1, ("set ACL from mode for %s", path));
+#endif
+
+	/* Get the security descriptor */
+	pntsd = get_cifs_acl(&acllen, inode, path);
+
+	/* 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 */
+
+		pnntsd = kmalloc(acllen, GFP_KERNEL);
+		if (!pnntsd) {
+			cERROR(1, ("Unable to allocate security descriptor"));
+			kfree(pntsd);
+			return (-ENOMEM);
+		}
+
+		rc = build_sec_desc(pntsd, pnntsd, acllen, inode, nmode);
+
+#ifdef CONFIG_CIFS_DEBUG2
+		cFYI(1, ("build_sec_desc rc: %d", rc));
+#endif
+
+		if (!rc) {
+			/* Set the security descriptor */
+			rc = set_cifs_acl(pnntsd, acllen, inode, path);
+#ifdef CONFIG_CIFS_DEBUG2
+			cFYI(1, ("set_cifs_acl rc: %d", rc));
+#endif
+		}
+
+		kfree(pnntsd);
+		kfree(pntsd);
+	}
+
+	return (rc);
+}
 #endif /* CONFIG_CIFS_EXPERIMENTAL */