source3/smbd/fake_file.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    FAKE FILE support, 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 "smbd/globals.h"
  23 #include "fake_file.h"
  24 #include "auth.h"
  25
  26 struct fake_file_type {
  27         const char *name;
  28         enum FAKE_FILE_TYPE type;
  29         void *(*init_pd)(TALLOC_CTX *mem_ctx);
  30 };
  31
  32 static const struct fake_file_type fake_files[] = {
  33 #ifdef WITH_QUOTAS
  34         {FAKE_FILE_NAME_QUOTA_UNIX, FAKE_FILE_TYPE_QUOTA, init_quota_handle},
  35 #endif /* WITH_QUOTAS */
  36         {NULL, FAKE_FILE_TYPE_NONE, NULL}
  37 };
  38
  39 /****************************************************************************
  40  Create a fake file handle
  41 ****************************************************************************/
  42
  43 static struct fake_file_handle *init_fake_file_handle(enum FAKE_FILE_TYPE type)
  44 {
  45         struct fake_file_handle *fh = NULL;
  46         int i;
  47
  48         for (i=0; fake_files[i].name!=NULL; i++) {
  49                 if (fake_files[i].type==type) {
  50                         break;
  51                 }
  52         }
  53
  54         if (fake_files[i].name == NULL) {
  55                 return NULL;
  56         }
  57
  58         DEBUG(5,("init_fake_file_handle: for [%s]\n",fake_files[i].name));
  59
  60         fh = talloc(NULL, struct fake_file_handle);
  61         if (fh == NULL) {
  62                 DEBUG(0,("TALLOC_ZERO() failed.\n"));
  63                 return NULL;
  64         }
  65
  66         fh->type = type;
  67
  68         if (fake_files[i].init_pd) {
  69                 fh->private_data = fake_files[i].init_pd(fh);
  70         }
  71         return fh;
  72 }
  73
  74 /****************************************************************************
  75  Does this name match a fake filename ?
  76 ****************************************************************************/
  77
  78 enum FAKE_FILE_TYPE is_fake_file_path(const char *path)
  79 {
  80         int i;
  81
  82         if (!path) {
  83                 return FAKE_FILE_TYPE_NONE;
  84         }
  85
  86         for (i=0;fake_files[i].name!=NULL;i++) {
  87                 if (strncmp(path,fake_files[i].name,strlen(fake_files[i].name))==0) {
  88                         DEBUG(5,("is_fake_file: [%s] is a fake file\n",path));
  89                         return fake_files[i].type;
  90                 }
  91         }
  92
  93         return FAKE_FILE_TYPE_NONE;
  94 }
  95
  96 enum FAKE_FILE_TYPE is_fake_file(const struct smb_filename *smb_fname)
  97 {
  98         char *fname = NULL;
  99         NTSTATUS status;
 100         enum FAKE_FILE_TYPE ret;
 101
 102         if (!smb_fname) {
 103                 return FAKE_FILE_TYPE_NONE;
 104         }
 105
 106         status = get_full_smb_filename(talloc_tos(), smb_fname, &fname);
 107         if (!NT_STATUS_IS_OK(status)) {
 108                 return FAKE_FILE_TYPE_NONE;
 109         }
 110
 111         ret = is_fake_file_path(fname);
 112
 113         TALLOC_FREE(fname);
 114
 115         return ret;
 116 }
 117
 118 uint32_t dosmode_from_fake_filehandle(const struct fake_file_handle *ffh)
 119 {
 120         if (ffh->type != FAKE_FILE_TYPE_QUOTA) {
 121                 DBG_ERR("Unexpected fake_file_handle: %d\n", ffh->type);
 122                 log_stack_trace();
 123                 return FILE_ATTRIBUTE_NORMAL;
 124         }
 125
 126         /* This is what Windows 2016 returns */
 127         return FILE_ATTRIBUTE_HIDDEN
 128                 | FILE_ATTRIBUTE_SYSTEM
 129                 | FILE_ATTRIBUTE_DIRECTORY
 130                 | FILE_ATTRIBUTE_ARCHIVE;
 131 }
 132
 133 /****************************************************************************
 134  Open a fake quota file with a share mode.
 135 ****************************************************************************/
 136
 137 NTSTATUS open_fake_file(struct smb_request *req, connection_struct *conn,
 138                                 uint64_t current_vuid,
 139                                 enum FAKE_FILE_TYPE fake_file_type,
 140                                 const struct smb_filename *smb_fname,
 141                                 uint32_t access_mask,
 142                                 files_struct **result)
 143 {
 144         const struct loadparm_substitution *lp_sub =
 145                 loadparm_s3_global_substitution();
 146         files_struct *fsp = NULL;
 147         NTSTATUS status;
 148
 149         /* access check */
 150         if (geteuid() != sec_initial_uid()) {
 151                 DBG_NOTICE("access_denied to service[%s] file[%s] user[%s]\n",
 152                            lp_servicename(talloc_tos(), lp_sub, SNUM(conn)),
 153                            smb_fname_str_dbg(smb_fname),
 154                            conn->session_info->unix_info->unix_name);
 155                 return NT_STATUS_ACCESS_DENIED;
 156
 157         }
 158
 159         status = file_new(req, conn, &fsp);
 160         if(!NT_STATUS_IS_OK(status)) {
 161                 return status;
 162         }
 163
 164         DBG_INFO("fname = %s, %s, access_mask = 0x%"PRIx32"\n",
 165                  smb_fname_str_dbg(smb_fname),
 166                  fsp_fnum_dbg(fsp),
 167                  access_mask);
 168
 169         fsp->conn = conn;
 170         fsp_set_fd(fsp, -1);
 171         fsp->vuid = current_vuid;
 172         fh_set_pos(fsp->fh, -1);
 173         fsp->fsp_flags.can_lock = false; /* Should this be true ? - No, JRA */
 174         fsp->access_mask = access_mask;
 175         status = fsp_set_smb_fname(fsp, smb_fname);
 176         if (!NT_STATUS_IS_OK(status)) {
 177                 file_free(req, fsp);
 178                 return NT_STATUS_NO_MEMORY;
 179         }
 180
 181         fsp->fake_file_handle = init_fake_file_handle(fake_file_type);
 182
 183         if (fsp->fake_file_handle==NULL) {
 184                 file_free(req, fsp);
 185                 return NT_STATUS_NO_MEMORY;
 186         }
 187
 188         status = smbd_calculate_access_mask_fsp(conn->cwd_fsp,
 189                                         fsp,
 190                                         false,
 191                                         access_mask,
 192                                         &access_mask);
 193         if (!NT_STATUS_IS_OK(status)) {
 194                 DBG_DEBUG("smbd_calculate_access_mask_fsp "
 195                         "on service[%s] file[%s] returned %s\n",
 196                         lp_servicename(talloc_tos(), lp_sub, SNUM(conn)),
 197                         smb_fname_str_dbg(smb_fname),
 198                         nt_errstr(status));
 199                 file_free(req, fsp);
 200                 return status;
 201         }
 202
 203         *result = fsp;
 204         return NT_STATUS_OK;
 205 }
 206
 207 NTSTATUS close_fake_file(struct smb_request *req, files_struct *fsp)
 208 {
 209         /*
 210          * Nothing to do, fake files don't hold any resources
 211          */
 212         return NT_STATUS_OK;
 213 }