333 lines
8.9 KiB
C
333 lines
8.9 KiB
C
/*
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* fs/cifs/cifsacl.c
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*
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* Copyright (C) International Business Machines Corp., 2007
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* Contains the routines for mapping CIFS/NTFS ACLs
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsacl.h"
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#include "cifsproto.h"
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#include "cifs_debug.h"
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#ifdef CONFIG_CIFS_EXPERIMENTAL
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static struct cifs_wksid wksidarr[NUM_WK_SIDS] = {
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{{1, 0, {0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0} }, "null user"},
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{{1, 1, {0, 0, 0, 0, 0, 1}, {0, 0, 0, 0, 0} }, "nobody"},
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{{1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(11), 0, 0, 0, 0} }, "net-users"},
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{{1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(18), 0, 0, 0, 0} }, "sys"},
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{{1, 2, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(32), cpu_to_le32(544), 0, 0, 0} }, "root"},
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{{1, 2, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(32), cpu_to_le32(545), 0, 0, 0} }, "users"},
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{{1, 2, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(32), cpu_to_le32(546), 0, 0, 0} }, "guest"}
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};
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/* security id for everyone */
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static const struct cifs_sid sid_everyone =
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{1, 1, {0, 0, 0, 0, 0, 0}, {} };
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/* group users */
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static const struct cifs_sid sid_user =
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{1, 2 , {0, 0, 0, 0, 0, 5}, {} };
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int match_sid(struct cifs_sid *ctsid)
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{
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int i, j;
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int num_subauth, num_sat, num_saw;
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struct cifs_sid *cwsid;
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if (!ctsid)
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return (-1);
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for (i = 0; i < NUM_WK_SIDS; ++i) {
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cwsid = &(wksidarr[i].cifssid);
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/* compare the revision */
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if (ctsid->revision != cwsid->revision)
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continue;
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/* compare all of the six auth values */
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for (j = 0; j < 6; ++j) {
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if (ctsid->authority[j] != cwsid->authority[j])
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break;
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}
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if (j < 6)
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continue; /* all of the auth values did not match */
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/* compare all of the subauth values if any */
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num_sat = ctsid->num_subauth;
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num_saw = cwsid->num_subauth;
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num_subauth = num_sat < num_saw ? num_sat : num_saw;
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if (num_subauth) {
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for (j = 0; j < num_subauth; ++j) {
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if (ctsid->sub_auth[j] != cwsid->sub_auth[j])
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break;
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}
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if (j < num_subauth)
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continue; /* all sub_auth values do not match */
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}
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cFYI(1, ("matching sid: %s\n", wksidarr[i].sidname));
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return (0); /* sids compare/match */
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}
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cFYI(1, ("No matching sid"));
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return (-1);
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}
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/* if the two SIDs (roughly equivalent to a UUID for a user or group) are
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the same returns 1, if they do not match returns 0 */
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int compare_sids(struct cifs_sid *ctsid, struct cifs_sid *cwsid)
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{
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int i;
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int num_subauth, num_sat, num_saw;
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if ((!ctsid) || (!cwsid))
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return (0);
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/* compare the revision */
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if (ctsid->revision != cwsid->revision)
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return (0);
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/* compare all of the six auth values */
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for (i = 0; i < 6; ++i) {
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if (ctsid->authority[i] != cwsid->authority[i])
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return (0);
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}
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/* compare all of the subauth values if any */
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num_sat = ctsid->num_subauth;
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num_saw = cwsid->num_subauth;
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num_subauth = num_sat < num_saw ? num_sat : num_saw;
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if (num_subauth) {
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for (i = 0; i < num_subauth; ++i) {
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if (ctsid->sub_auth[i] != cwsid->sub_auth[i])
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return (0);
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}
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}
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return (1); /* sids compare/match */
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}
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static void parse_ace(struct cifs_ace *pace, char *end_of_acl)
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{
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int num_subauth;
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/* validate that we do not go past end of acl */
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/* XXX this if statement can be removed
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if (end_of_acl < (char *)pace + sizeof(struct cifs_ace)) {
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cERROR(1, ("ACL too small to parse ACE"));
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return;
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} */
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num_subauth = pace->num_subauth;
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if (num_subauth) {
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#ifdef CONFIG_CIFS_DEBUG2
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int i;
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cFYI(1, ("ACE revision %d num_subauth %d",
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pace->revision, pace->num_subauth));
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for (i = 0; i < num_subauth; ++i) {
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cFYI(1, ("ACE sub_auth[%d]: 0x%x", i,
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le32_to_cpu(pace->sub_auth[i])));
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}
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/* BB add length check to make sure that we do not have huge
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num auths and therefore go off the end */
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cFYI(1, ("RID %d", le32_to_cpu(pace->sub_auth[num_subauth-1])));
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#endif
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}
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return;
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}
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static void parse_ntace(struct cifs_ntace *pntace, char *end_of_acl)
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{
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/* validate that we do not go past end of acl */
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if (end_of_acl < (char *)pntace + sizeof(struct cifs_ntace)) {
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cERROR(1, ("ACL too small to parse NT ACE"));
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return;
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}
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#ifdef CONFIG_CIFS_DEBUG2
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cFYI(1, ("NTACE type %d flags 0x%x size %d, access Req 0x%x",
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pntace->type, pntace->flags, pntace->size,
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pntace->access_req));
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#endif
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return;
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}
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static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
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struct cifs_sid *pownersid, struct cifs_sid *pgrpsid)
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{
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int i;
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int num_aces = 0;
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int acl_size;
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char *acl_base;
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struct cifs_ntace **ppntace;
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struct cifs_ace **ppace;
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/* BB need to add parm so we can store the SID BB */
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/* validate that we do not go past end of acl */
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if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) {
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cERROR(1, ("ACL too small to parse DACL"));
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return;
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}
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#ifdef CONFIG_CIFS_DEBUG2
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cFYI(1, ("DACL revision %d size %d num aces %d",
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le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size),
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le32_to_cpu(pdacl->num_aces)));
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#endif
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acl_base = (char *)pdacl;
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acl_size = sizeof(struct cifs_acl);
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num_aces = le32_to_cpu(pdacl->num_aces);
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if (num_aces > 0) {
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ppntace = kmalloc(num_aces * sizeof(struct cifs_ntace *),
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GFP_KERNEL);
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ppace = kmalloc(num_aces * sizeof(struct cifs_ace *),
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GFP_KERNEL);
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/* cifscred->cecount = pdacl->num_aces;
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cifscred->ntaces = kmalloc(num_aces *
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sizeof(struct cifs_ntace *), GFP_KERNEL);
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cifscred->aces = kmalloc(num_aces *
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sizeof(struct cifs_ace *), GFP_KERNEL);*/
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for (i = 0; i < num_aces; ++i) {
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ppntace[i] = (struct cifs_ntace *)
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(acl_base + acl_size);
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ppace[i] = (struct cifs_ace *) ((char *)ppntace[i] +
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sizeof(struct cifs_ntace));
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parse_ntace(ppntace[i], end_of_acl);
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if (end_of_acl < ((char *)ppace[i] +
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(le16_to_cpu(ppntace[i]->size) -
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sizeof(struct cifs_ntace)))) {
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cERROR(1, ("ACL too small to parse ACE"));
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break;
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} else
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parse_ace(ppace[i], end_of_acl);
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/* memcpy((void *)(&(cifscred->ntaces[i])),
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(void *)ppntace[i],
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sizeof(struct cifs_ntace));
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memcpy((void *)(&(cifscred->aces[i])),
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(void *)ppace[i],
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sizeof(struct cifs_ace)); */
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acl_base = (char *)ppntace[i];
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acl_size = le16_to_cpu(ppntace[i]->size);
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}
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kfree(ppace);
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kfree(ppntace);
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}
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return;
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}
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static int parse_sid(struct cifs_sid *psid, char *end_of_acl)
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{
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/* BB need to add parm so we can store the SID BB */
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/* validate that we do not go past end of acl */
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if (end_of_acl < (char *)psid + sizeof(struct cifs_sid)) {
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cERROR(1, ("ACL too small to parse SID"));
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return -EINVAL;
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}
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if (psid->num_subauth) {
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#ifdef CONFIG_CIFS_DEBUG2
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int i;
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cFYI(1, ("SID revision %d num_auth %d First subauth 0x%x",
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psid->revision, psid->num_subauth, psid->sub_auth[0]));
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for (i = 0; i < psid->num_subauth; i++) {
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cFYI(1, ("SID sub_auth[%d]: 0x%x ", i,
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le32_to_cpu(psid->sub_auth[i])));
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}
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/* BB add length check to make sure that we do not have huge
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num auths and therefore go off the end */
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cFYI(1, ("RID 0x%x",
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le32_to_cpu(psid->sub_auth[psid->num_subauth-1])));
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#endif
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}
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return 0;
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}
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/* Convert CIFS ACL to POSIX form */
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int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len)
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{
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int rc;
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struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
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struct cifs_acl *dacl_ptr; /* no need for SACL ptr */
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char *end_of_acl = ((char *)pntsd) + acl_len;
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owner_sid_ptr = (struct cifs_sid *)((char *)pntsd +
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le32_to_cpu(pntsd->osidoffset));
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group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
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le32_to_cpu(pntsd->gsidoffset));
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dacl_ptr = (struct cifs_acl *)((char *)pntsd +
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le32_to_cpu(pntsd->dacloffset));
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#ifdef CONFIG_CIFS_DEBUG2
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cFYI(1, ("revision %d type 0x%x ooffset 0x%x goffset 0x%x "
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"sacloffset 0x%x dacloffset 0x%x",
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pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset),
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le32_to_cpu(pntsd->gsidoffset),
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le32_to_cpu(pntsd->sacloffset),
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le32_to_cpu(pntsd->dacloffset)));
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#endif
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rc = parse_sid(owner_sid_ptr, end_of_acl);
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if (rc)
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return rc;
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rc = parse_sid(group_sid_ptr, end_of_acl);
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if (rc)
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return rc;
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parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, group_sid_ptr);
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/* cifscred->uid = owner_sid_ptr->rid;
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cifscred->gid = group_sid_ptr->rid;
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memcpy((void *)(&(cifscred->osid)), (void *)owner_sid_ptr,
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sizeof (struct cifs_sid));
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memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr,
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sizeof (struct cifs_sid)); */
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return (0);
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}
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#endif /* CONFIG_CIFS_EXPERIMENTAL */
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