source3/modules/nfs4acl_xattr_ndr.c

   1 /*
   2  * Convert NFSv4 acls stored per http://www.suse.de/~agruen/nfs4acl/ to NT acls and vice versa.
   3  *
   4  * Copyright (C) Jiri Sasek, 2007
   5  * based on the foobar.c module which is copyrighted by Volker Lendecke
   6  * based on pvfs_acl_nfs4.c  Copyright (C) Andrew Tridgell 2006
   7  *
   8  * based on vfs_fake_acls:
   9  * Copyright (C) Tim Potter, 1999-2000
  10  * Copyright (C) Alexander Bokovoy, 2002
  11  * Copyright (C) Andrew Bartlett, 2002,2012
  12  * Copyright (C) Ralph Boehme 2017
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 3 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  26  *
  27  */
  28
  29 #include "includes.h"
  30 #include "system/filesys.h"
  31 #include "smbd/smbd.h"
  32 #include "nfs4_acls.h"
  33 #include "librpc/gen_ndr/ndr_nfs4acl.h"
  34 #include "nfs4acl_xattr.h"
  35 #include "nfs4acl_xattr_ndr.h"
  36
  37 #undef DBGC_CLASS
  38 #define DBGC_CLASS DBGC_VFS
  39
  40 static struct nfs4acl *nfs4acl_blob2acl(DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
  41 {
  42         enum ndr_err_code ndr_err;
  43         struct nfs4acl *acl = talloc_zero(mem_ctx, struct nfs4acl);
  44
  45         if (acl == NULL) {
  46                 errno = ENOMEM;
  47                 return NULL;
  48         }
  49
  50         ndr_err = ndr_pull_struct_blob(blob, acl, acl,
  51                 (ndr_pull_flags_fn_t)ndr_pull_nfs4acl);
  52
  53         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  54                 DBG_ERR("ndr_pull_acl_t failed: %s\n", ndr_errstr(ndr_err));
  55                 TALLOC_FREE(acl);
  56                 return NULL;
  57         }
  58         return acl;
  59 }
  60
  61 static DATA_BLOB nfs4acl_acl2blob(TALLOC_CTX *mem_ctx, struct nfs4acl *acl)
  62 {
  63         enum ndr_err_code ndr_err;
  64         DATA_BLOB blob;
  65
  66         ndr_err = ndr_push_struct_blob(&blob, mem_ctx, acl,
  67                 (ndr_push_flags_fn_t)ndr_push_nfs4acl);
  68
  69         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  70                 DBG_ERR("ndr_push_acl_t failed: %s\n", ndr_errstr(ndr_err));
  71                 return data_blob_null;
  72         }
  73         return blob;
  74 }
  75
  76 NTSTATUS nfs4acl_ndr_blob_to_smb4(struct vfs_handle_struct *handle,
  77                                   TALLOC_CTX *mem_ctx,
  78                                   DATA_BLOB *blob,
  79                                   struct SMB4ACL_T **_smb4acl)
  80 {
  81         struct nfs4acl *nfs4acl = NULL;
  82         struct SMB4ACL_T *smb4acl = NULL;
  83         TALLOC_CTX *frame = talloc_stackframe();
  84         struct nfs4acl_config *config = NULL;
  85         int i;
  86
  87         SMB_VFS_HANDLE_GET_DATA(handle, config,
  88                                 struct nfs4acl_config,
  89                                 return NT_STATUS_INTERNAL_ERROR);
  90
  91         nfs4acl = nfs4acl_blob2acl(blob, frame);
  92         if (nfs4acl == NULL) {
  93                 TALLOC_FREE(frame);
  94                 return NT_STATUS_INTERNAL_ERROR;
  95         }
  96
  97         smb4acl = smb_create_smb4acl(mem_ctx);
  98         if (smb4acl == NULL) {
  99                 TALLOC_FREE(frame);
 100                 return NT_STATUS_NO_MEMORY;
 101         }
 102
 103         for (i = 0; i < nfs4acl->a_count; i++) {
 104                 SMB_ACE4PROP_T aceprop;
 105
 106                 aceprop.aceType  = (uint32_t) nfs4acl->ace[i].e_type;
 107                 aceprop.aceFlags = (uint32_t) nfs4acl->ace[i].e_flags;
 108                 aceprop.aceMask  = (uint32_t) nfs4acl->ace[i].e_mask;
 109                 aceprop.who.id   = (uint32_t) nfs4acl->ace[i].e_id;
 110
 111                 if (!strcmp(nfs4acl->ace[i].e_who,
 112                             NFS4ACL_XATTR_OWNER_WHO)) {
 113                         aceprop.flags = SMB_ACE4_ID_SPECIAL;
 114                         aceprop.who.special_id = SMB_ACE4_WHO_OWNER;
 115                 } else if (!strcmp(nfs4acl->ace[i].e_who,
 116                                    NFS4ACL_XATTR_GROUP_WHO)) {
 117                         aceprop.flags = SMB_ACE4_ID_SPECIAL;
 118                         aceprop.who.special_id = SMB_ACE4_WHO_GROUP;
 119                 } else if (!strcmp(nfs4acl->ace[i].e_who,
 120                                    NFS4ACL_XATTR_EVERYONE_WHO)) {
 121                         aceprop.flags = SMB_ACE4_ID_SPECIAL;
 122                         aceprop.who.special_id = SMB_ACE4_WHO_EVERYONE;
 123                 } else {
 124                         aceprop.flags = 0;
 125                 }
 126
 127                 if (smb_add_ace4(smb4acl, &aceprop) == NULL) {
 128                         TALLOC_FREE(frame);
 129                         return NT_STATUS_NO_MEMORY;
 130                 }
 131         }
 132
 133         *_smb4acl = smb4acl;
 134         TALLOC_FREE(frame);
 135         return NT_STATUS_OK;
 136 }
 137
 138 static bool nfs4acl_smb4acl2nfs4acl(TALLOC_CTX *mem_ctx,
 139                                     struct SMB4ACL_T *smbacl,
 140                                     struct nfs4acl **_nfs4acl,
 141                                     bool denymissingspecial)
 142 {
 143         struct nfs4acl *nfs4acl = NULL;
 144         struct SMB4ACE_T *smbace = NULL;
 145         bool have_special_id = false;
 146         int i;
 147
 148         nfs4acl = talloc_zero(mem_ctx, struct nfs4acl);
 149         if (nfs4acl == NULL) {
 150                 errno = ENOMEM;
 151                 return false;
 152         }
 153
 154         nfs4acl->a_count = smb_get_naces(smbacl);
 155
 156         nfs4acl->ace = talloc_zero_array(nfs4acl, struct nfs4ace,
 157                                          nfs4acl->a_count);
 158         if (nfs4acl->ace == NULL) {
 159                 TALLOC_FREE(nfs4acl);
 160                 errno = ENOMEM;
 161                 return false;
 162         }
 163
 164         for (smbace = smb_first_ace4(smbacl), i = 0;
 165              smbace != NULL;
 166              smbace = smb_next_ace4(smbace), i++)
 167         {
 168                 SMB_ACE4PROP_T *aceprop = smb_get_ace4(smbace);
 169
 170                 nfs4acl->ace[i].e_type        = aceprop->aceType;
 171                 nfs4acl->ace[i].e_flags       = aceprop->aceFlags;
 172                 nfs4acl->ace[i].e_mask        = aceprop->aceMask;
 173                 nfs4acl->ace[i].e_id          = aceprop->who.id;
 174                 if(aceprop->flags & SMB_ACE4_ID_SPECIAL) {
 175                         switch(aceprop->who.special_id) {
 176                         case SMB_ACE4_WHO_EVERYONE:
 177                                 nfs4acl->ace[i].e_who =
 178                                         NFS4ACL_XATTR_EVERYONE_WHO;
 179                                 break;
 180                         case SMB_ACE4_WHO_OWNER:
 181                                 nfs4acl->ace[i].e_who =
 182                                         NFS4ACL_XATTR_OWNER_WHO;
 183                                 break;
 184                         case SMB_ACE4_WHO_GROUP:
 185                                 nfs4acl->ace[i].e_who =
 186                                         NFS4ACL_XATTR_GROUP_WHO;
 187                                 break;
 188                         default:
 189                                 DBG_DEBUG("unsupported special_id %d\n",
 190                                           aceprop->who.special_id);
 191                                 continue; /* don't add it !!! */
 192                         }
 193                         have_special_id = true;
 194                 } else {
 195                         nfs4acl->ace[i].e_who = "";
 196                 }
 197         }
 198
 199         if (!have_special_id && denymissingspecial) {
 200                 TALLOC_FREE(nfs4acl);
 201                 errno = EACCES;
 202                 return false;
 203         }
 204
 205         SMB_ASSERT(i == nfs4acl->a_count);
 206
 207         *_nfs4acl = nfs4acl;
 208         return true;
 209 }
 210
 211 NTSTATUS nfs4acl_smb4acl_to_ndr_blob(vfs_handle_struct *handle,
 212                                      TALLOC_CTX *mem_ctx,
 213                                      struct SMB4ACL_T *smb4acl,
 214                                      DATA_BLOB *_blob)
 215 {
 216         struct nfs4acl *nfs4acl = NULL;
 217         DATA_BLOB blob;
 218         bool denymissingspecial;
 219         bool ok;
 220
 221         denymissingspecial = lp_parm_bool(SNUM(handle->conn),
 222                                           "nfs4acl_xattr",
 223                                           "denymissingspecial", false);
 224
 225         ok = nfs4acl_smb4acl2nfs4acl(talloc_tos(), smb4acl, &nfs4acl,
 226                                      denymissingspecial);
 227         if (!ok) {
 228                 DBG_ERR("Failed to convert smb ACL to nfs4 ACL.\n");
 229                 return NT_STATUS_INTERNAL_ERROR;
 230         }
 231
 232         blob = nfs4acl_acl2blob(mem_ctx, nfs4acl);
 233         TALLOC_FREE(nfs4acl);
 234         if (blob.data == NULL) {
 235                 DBG_ERR("Failed to convert ACL to linear blob for xattr\n");
 236                 return NT_STATUS_INTERNAL_ERROR;
 237         }
 238
 239         *_blob = blob;
 240         return NT_STATUS_OK;
 241 }