1 files changed, 333 insertions, 0 deletions
diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
new file mode 100644
index 00000000000..e8e56353f5a
--- /dev/null
+++ b/fs/cifs/cifsacl.c
@@ -0,0 +1,333 @@
+/*
+ *   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 */