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 "smbd/smbd.h"
  22 #include "fake_file.h"
  23 #include "auth.h"
  24
  25 struct fake_file_type {
  26         const char *name;
  27         enum FAKE_FILE_TYPE type;
  28         void *(*init_pd)(TALLOC_CTX *mem_ctx);
  29 };
  30
  31 static const struct fake_file_type fake_files[] = {
  32 #ifdef WITH_QUOTAS
  33         {FAKE_FILE_NAME_QUOTA_UNIX, FAKE_FILE_TYPE_QUOTA, init_quota_handle},
  34 #endif /* WITH_QUOTAS */
  35         {NULL, FAKE_FILE_TYPE_NONE, NULL}
  36 };
  37
  38 /****************************************************************************
  39  Create a fake file handle
  40 ****************************************************************************/
  41
  42 static struct fake_file_handle *init_fake_file_handle(enum FAKE_FILE_TYPE type)
  43 {
  44         struct fake_file_handle *fh = NULL;
  45         int i;
  46
  47         for (i=0; fake_files[i].name!=NULL; i++) {
  48                 if (fake_files[i].type==type) {
  49                         break;
  50                 }
  51         }
  52
  53         if (fake_files[i].name == NULL) {
  54                 return NULL;
  55         }
  56
  57         DEBUG(5,("init_fake_file_handle: for [%s]\n",fake_files[i].name));
  58
  59         fh = talloc(NULL, struct fake_file_handle);
  60         if (fh == NULL) {
  61                 DEBUG(0,("TALLOC_ZERO() failed.\n"));
  62                 return NULL;
  63         }
  64
  65         fh->type = type;
  66
  67         if (fake_files[i].init_pd) {
  68                 fh->private_data = fake_files[i].init_pd(fh);
  69         }
  70         return fh;
  71 }
  72
  73 /****************************************************************************
  74  Does this name match a fake filename ?
  75 ****************************************************************************/
  76
  77 enum FAKE_FILE_TYPE is_fake_file_path(const char *path)
  78 {
  79         int i;
  80
  81         if (!path) {
  82                 return FAKE_FILE_TYPE_NONE;
  83         }
  84
  85         for (i=0;fake_files[i].name!=NULL;i++) {
  86                 if (strncmp(path,fake_files[i].name,strlen(fake_files[i].name))==0) {
  87                         DEBUG(5,("is_fake_file: [%s] is a fake file\n",path));
  88                         return fake_files[i].type;
  89                 }
  90         }
  91
  92         return FAKE_FILE_TYPE_NONE;
  93 }
  94
  95 enum FAKE_FILE_TYPE is_fake_file(const struct smb_filename *smb_fname)
  96 {
  97         char *fname = NULL;
  98         NTSTATUS status;
  99         enum FAKE_FILE_TYPE ret;
 100
 101         if (!smb_fname) {
 102                 return FAKE_FILE_TYPE_NONE;
 103         }
 104
 105         status = get_full_smb_filename(talloc_tos(), smb_fname, &fname);
 106         if (!NT_STATUS_IS_OK(status)) {
 107                 return FAKE_FILE_TYPE_NONE;
 108         }
 109
 110         ret = is_fake_file_path(fname);
 111
 112         TALLOC_FREE(fname);
 113
 114         return ret;
 115 }
 116
 117 /****************************************************************************
 118  Open a fake quota file with a share mode.
 119 ****************************************************************************/
 120
 121 NTSTATUS open_fake_file(struct smb_request *req, connection_struct *conn,
 122                                 uint16_t current_vuid,
 123                                 enum FAKE_FILE_TYPE fake_file_type,
 124                                 const struct smb_filename *smb_fname,
 125                                 uint32 access_mask,
 126                                 files_struct **result)
 127 {
 128         files_struct *fsp = NULL;
 129         NTSTATUS status;
 130
 131         /* access check */
 132         if (geteuid() != sec_initial_uid()) {
 133                 DEBUG(3, ("open_fake_file_shared: access_denied to "
 134                           "service[%s] file[%s] user[%s]\n",
 135                           lp_servicename(SNUM(conn)),
 136                           smb_fname_str_dbg(smb_fname),
 137                           conn->session_info->unix_name));
 138                 return NT_STATUS_ACCESS_DENIED;
 139
 140         }
 141
 142         status = file_new(req, conn, &fsp);
 143         if(!NT_STATUS_IS_OK(status)) {
 144                 return status;
 145         }
 146
 147         DEBUG(5,("open_fake_file_shared: fname = %s, FID = %d, access_mask = 0x%x\n",
 148                  smb_fname_str_dbg(smb_fname), fsp->fnum,
 149                  (unsigned int)access_mask));
 150
 151         fsp->conn = conn;
 152         fsp->fh->fd = -1;
 153         fsp->vuid = current_vuid;
 154         fsp->fh->pos = -1;
 155         fsp->can_lock = False; /* Should this be true ? - No, JRA */
 156         fsp->access_mask = access_mask;
 157         status = fsp_set_smb_fname(fsp, smb_fname);
 158         if (!NT_STATUS_IS_OK(status)) {
 159                 file_free(req, fsp);
 160                 return NT_STATUS_NO_MEMORY;
 161         }
 162
 163         fsp->fake_file_handle = init_fake_file_handle(fake_file_type);
 164
 165         if (fsp->fake_file_handle==NULL) {
 166                 file_free(req, fsp);
 167                 return NT_STATUS_NO_MEMORY;
 168         }
 169
 170         *result = fsp;
 171         return NT_STATUS_OK;
 172 }
 173
 174 NTSTATUS close_fake_file(struct smb_request *req, files_struct *fsp)
 175 {
 176         file_free(req, fsp);
 177         return NT_STATUS_OK;
 178 }