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 #include "fake_file.h"
  22
  23 struct fake_file_type {
  24         const char *name;
  25         enum FAKE_FILE_TYPE type;
  26         void *(*init_pd)(TALLOC_CTX *mem_ctx);
  27 };
  28
  29 static const struct fake_file_type fake_files[] = {
  30 #ifdef WITH_QUOTAS
  31         {FAKE_FILE_NAME_QUOTA_UNIX, FAKE_FILE_TYPE_QUOTA, init_quota_handle},
  32 #endif /* WITH_QUOTAS */
  33         {NULL, FAKE_FILE_TYPE_NONE, NULL}
  34 };
  35
  36 /****************************************************************************
  37  Create a fake file handle
  38 ****************************************************************************/
  39
  40 static struct fake_file_handle *init_fake_file_handle(enum FAKE_FILE_TYPE type)
  41 {
  42         struct fake_file_handle *fh = NULL;
  43         int i;
  44
  45         for (i=0; fake_files[i].name!=NULL; i++) {
  46                 if (fake_files[i].type==type) {
  47                         break;
  48                 }
  49         }
  50
  51         if (fake_files[i].name == NULL) {
  52                 return NULL;
  53         }
  54
  55         DEBUG(5,("init_fake_file_handle: for [%s]\n",fake_files[i].name));
  56
  57         fh = talloc(NULL, struct fake_file_handle);
  58         if (fh == NULL) {
  59                 DEBUG(0,("TALLOC_ZERO() failed.\n"));
  60                 return NULL;
  61         }
  62
  63         fh->type = type;
  64
  65         if (fake_files[i].init_pd) {
  66                 fh->private_data = fake_files[i].init_pd(fh);
  67         }
  68         return fh;
  69 }
  70
  71 /****************************************************************************
  72  Does this name match a fake filename ?
  73 ****************************************************************************/
  74
  75 enum FAKE_FILE_TYPE is_fake_file_path(const char *path)
  76 {
  77         int i;
  78
  79         if (!path) {
  80                 return FAKE_FILE_TYPE_NONE;
  81         }
  82
  83         for (i=0;fake_files[i].name!=NULL;i++) {
  84                 if (strncmp(path,fake_files[i].name,strlen(fake_files[i].name))==0) {
  85                         DEBUG(5,("is_fake_file: [%s] is a fake file\n",path));
  86                         return fake_files[i].type;
  87                 }
  88         }
  89
  90         return FAKE_FILE_TYPE_NONE;
  91 }
  92
  93 enum FAKE_FILE_TYPE is_fake_file(const struct smb_filename *smb_fname)
  94 {
  95         char *fname = NULL;
  96         NTSTATUS status;
  97         enum FAKE_FILE_TYPE ret;
  98
  99         if (!smb_fname) {
 100                 return FAKE_FILE_TYPE_NONE;
 101         }
 102
 103         status = get_full_smb_filename(talloc_tos(), smb_fname, &fname);
 104         if (!NT_STATUS_IS_OK(status)) {
 105                 return FAKE_FILE_TYPE_NONE;
 106         }
 107
 108         ret = is_fake_file_path(fname);
 109
 110         TALLOC_FREE(fname);
 111
 112         return ret;
 113 }
 114
 115 /****************************************************************************
 116  Open a fake quota file with a share mode.
 117 ****************************************************************************/
 118
 119 NTSTATUS open_fake_file(struct smb_request *req, connection_struct *conn,
 120                                 uint16_t current_vuid,
 121                                 enum FAKE_FILE_TYPE fake_file_type,
 122                                 const struct smb_filename *smb_fname,
 123                                 uint32 access_mask,
 124                                 files_struct **result)
 125 {
 126         files_struct *fsp = NULL;
 127         NTSTATUS status;
 128
 129         /* access check */
 130         if (geteuid() != sec_initial_uid()) {
 131                 DEBUG(3, ("open_fake_file_shared: access_denied to "
 132                           "service[%s] file[%s] user[%s]\n",
 133                           lp_servicename(SNUM(conn)),
 134                           smb_fname_str_dbg(smb_fname),
 135                           conn->session_info->unix_name));
 136                 return NT_STATUS_ACCESS_DENIED;
 137
 138         }
 139
 140         status = file_new(req, conn, &fsp);
 141         if(!NT_STATUS_IS_OK(status)) {
 142                 return status;
 143         }
 144
 145         DEBUG(5,("open_fake_file_shared: fname = %s, FID = %d, access_mask = 0x%x\n",
 146                  smb_fname_str_dbg(smb_fname), fsp->fnum,
 147                  (unsigned int)access_mask));
 148
 149         fsp->conn = conn;
 150         fsp->fh->fd = -1;
 151         fsp->vuid = current_vuid;
 152         fsp->fh->pos = -1;
 153         fsp->can_lock = False; /* Should this be true ? - No, JRA */
 154         fsp->access_mask = access_mask;
 155         status = fsp_set_smb_fname(fsp, smb_fname);
 156         if (!NT_STATUS_IS_OK(status)) {
 157                 file_free(req, fsp);
 158                 return NT_STATUS_NO_MEMORY;
 159         }
 160
 161         fsp->fake_file_handle = init_fake_file_handle(fake_file_type);
 162
 163         if (fsp->fake_file_handle==NULL) {
 164                 file_free(req, fsp);
 165                 return NT_STATUS_NO_MEMORY;
 166         }
 167
 168         *result = fsp;
 169         return NT_STATUS_OK;
 170 }
 171
 172 NTSTATUS close_fake_file(struct smb_request *req, files_struct *fsp)
 173 {
 174         file_free(req, fsp);
 175         return NT_STATUS_OK;
 176 }