135 lines
4.2 KiB
C
135 lines
4.2 KiB
C
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/*
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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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/* 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}, {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}, {32, 545, 0, 0}};
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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 to small to parse SID"));
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return -EINVAL;
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}
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#ifdef CONFIG_CIFS_DEBUG2
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cFYI(1, ("revision %d num_auth %d First subauth 0x%x",
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psid->revision, psid->num_auth, psid->sub_auth[0]));
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/* BB add length check to make sure that we do not have huge num auths
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and therefore go off the end */
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cFYI(1, ("RID 0x%x", le32_to_cpu(psid->sub_auth[psid->num_auth])));
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#endif
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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 i;
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int num_aces = 0;
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int acl_size;
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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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struct cifs_ntace **ppntace;
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struct cifs_ace **ppace;
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char *acl_base;
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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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cpu_to_le32(pntsd->osidoffset));
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group_sid_ptr = (struct cifs_sid *)((char *)pntsd +
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cpu_to_le32(pntsd->gsidoffset));
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dacl_ptr = (struct cifs_acl *)((char *)pntsd +
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cpu_to_le32(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,
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pntsd->osidoffset, pntsd->gsidoffset, pntsd->sacloffset,
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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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/* 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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num_aces = cpu_to_le32(dacl_ptr->num_aces);
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cFYI(1, ("num aces %d", 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 = dacl_ptr->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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acl_base = (char *)dacl_ptr;
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acl_size = sizeof(struct cifs_acl);
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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 *)
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((char *)ppntace[i] +
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sizeof(struct cifs_ntace));
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/* memcpy((void *)(&(cifscred->ntaces[i])),
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(void *)ntace_ptrptr[i],
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sizeof(struct cifs_ntace));
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memcpy((void *)(&(cifscred->aces[i])),
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(void *)ace_ptrptr[i],
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sizeof(struct cifs_ace)); */
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acl_base = (char *)ppntace[i];
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acl_size = cpu_to_le32(ppntace[i]->size);
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#ifdef CONFIG_CIFS_DEBUG2
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cFYI(1, ("ACE revision:%d", ppace[i]->revision));
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#endif
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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 (0);
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}
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