source3/smbd/fake_file.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    FAKE FILE suppport, for faking up special files windows want access to
   4    Copyright (C) Stefan (metze) Metzmacher      2003
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21
  22 struct fake_file_type {
  23         const char *name;
  24         enum FAKE_FILE_TYPE type;
  25         void *(*init_pd)(TALLOC_CTX *mem_ctx);
  26 };
  27
  28 static const struct fake_file_type fake_files[] = {
  29 #ifdef WITH_QUOTAS
  30         {FAKE_FILE_NAME_QUOTA_UNIX, FAKE_FILE_TYPE_QUOTA, init_quota_handle},
  31 #endif /* WITH_QUOTAS */
  32         {NULL, FAKE_FILE_TYPE_NONE, NULL}
  33 };
  34
  35 /****************************************************************************
  36  Create a fake file handle
  37 ****************************************************************************/
  38
  39 static struct fake_file_handle *init_fake_file_handle(enum FAKE_FILE_TYPE type)
  40 {
  41         struct fake_file_handle *fh = NULL;
  42         int i;
  43
  44         for (i=0; fake_files[i].name!=NULL; i++) {
  45                 if (fake_files[i].type==type) {
  46                         break;
  47                 }
  48         }
  49
  50         if (fake_files[i].name == NULL) {
  51                 return NULL;
  52         }
  53
  54         DEBUG(5,("init_fake_file_handle: for [%s]\n",fake_files[i].name));
  55
  56         fh = talloc(NULL, struct fake_file_handle);
  57         if (fh == NULL) {
  58                 DEBUG(0,("TALLOC_ZERO() failed.\n"));
  59                 return NULL;
  60         }
  61
  62         fh->type = type;
  63
  64         if (fake_files[i].init_pd) {
  65                 fh->private_data = fake_files[i].init_pd(fh);
  66         }
  67         return fh;
  68 }
  69
  70 /****************************************************************************
  71  Does this name match a fake filename ?
  72 ****************************************************************************/
  73
  74 enum FAKE_FILE_TYPE is_fake_file_path(const char *path)
  75 {
  76         int i;
  77
  78         if (!path) {
  79                 return FAKE_FILE_TYPE_NONE;
  80         }
  81
  82         for (i=0;fake_files[i].name!=NULL;i++) {
  83                 if (strncmp(path,fake_files[i].name,strlen(fake_files[i].name))==0) {
  84                         DEBUG(5,("is_fake_file: [%s] is a fake file\n",path));
  85                         return fake_files[i].type;
  86                 }
  87         }
  88
  89         return FAKE_FILE_TYPE_NONE;
  90 }
  91
  92 enum FAKE_FILE_TYPE is_fake_file(const struct smb_filename *smb_fname)
  93 {
  94         char *fname = NULL;
  95         NTSTATUS status;
  96         enum FAKE_FILE_TYPE ret;
  97
  98         if (!smb_fname) {
  99                 return FAKE_FILE_TYPE_NONE;
 100         }
 101
 102         status = get_full_smb_filename(talloc_tos(), smb_fname, &fname);
 103         if (!NT_STATUS_IS_OK(status)) {
 104                 return FAKE_FILE_TYPE_NONE;
 105         }
 106
 107         ret = is_fake_file_path(fname);
 108
 109         TALLOC_FREE(fname);
 110
 111         return ret;
 112 }
 113
 114 /****************************************************************************
 115  Open a fake quota file with a share mode.
 116 ****************************************************************************/
 117
 118 NTSTATUS open_fake_file(struct smb_request *req, connection_struct *conn,
 119                                 uint16_t current_vuid,
 120                                 enum FAKE_FILE_TYPE fake_file_type,
 121                                 const struct smb_filename *smb_fname,
 122                                 uint32 access_mask,
 123                                 files_struct **result)
 124 {
 125         files_struct *fsp = NULL;
 126         NTSTATUS status;
 127
 128         /* access check */
 129         if (geteuid() != sec_initial_uid()) {
 130                 DEBUG(3, ("open_fake_file_shared: access_denied to "
 131                           "service[%s] file[%s] user[%s]\n",
 132                           lp_servicename(SNUM(conn)),
 133                           smb_fname_str_dbg(smb_fname),
 134                           conn->server_info->unix_name));
 135                 return NT_STATUS_ACCESS_DENIED;
 136
 137         }
 138
 139         status = file_new(req, conn, &fsp);
 140         if(!NT_STATUS_IS_OK(status)) {
 141                 return status;
 142         }
 143
 144         DEBUG(5,("open_fake_file_shared: fname = %s, FID = %d, access_mask = 0x%x\n",
 145                  smb_fname_str_dbg(smb_fname), fsp->fnum,
 146                  (unsigned int)access_mask));
 147
 148         fsp->conn = conn;
 149         fsp->fh->fd = -1;
 150         fsp->vuid = current_vuid;
 151         fsp->fh->pos = -1;
 152         fsp->can_lock = False; /* Should this be true ? - No, JRA */
 153         fsp->access_mask = access_mask;
 154         status = fsp_set_smb_fname(fsp, smb_fname);
 155         if (!NT_STATUS_IS_OK(status)) {
 156                 file_free(req, fsp);
 157                 return NT_STATUS_NO_MEMORY;
 158         }
 159
 160         fsp->fake_file_handle = init_fake_file_handle(fake_file_type);
 161
 162         if (fsp->fake_file_handle==NULL) {
 163                 file_free(req, fsp);
 164                 return NT_STATUS_NO_MEMORY;
 165         }
 166
 167         *result = fsp;
 168         return NT_STATUS_OK;
 169 }
 170
 171 NTSTATUS close_fake_file(struct smb_request *req, files_struct *fsp)
 172 {
 173         file_free(req, fsp);
 174         return NT_STATUS_OK;
 175 }