source3/modules/vfs_dfs_samba4.c

   1 /*
   2  * VFS module to alter the algorithm to calculate
   3  * the struct file_id used as key for the share mode
   4  * and byte range locking db's.
   5  *
   6  * Copyright (C) 2007, Stefan Metzmacher
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "includes.h"
  23 #include "smbd/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "system/filesys.h"
  26 #include "source3/include/msdfs.h"
  27 #include "librpc/gen_ndr/ndr_dfsblobs.h"
  28 #include "source4/lib/events/events.h"
  29 #include "source4/auth/session.h"
  30 #include "lib/param/param.h"
  31 #include "source4/dsdb/samdb/samdb.h"
  32 #include "dfs_server/dfs_server_ad.h"
  33
  34 static int vfs_dfs_samba4_debug_level = DBGC_VFS;
  35
  36 #undef DBGC_CLASS
  37 #define DBGC_CLASS vfs_dfs_samba4_debug_level
  38
  39 struct dfs_samba4_handle_data {
  40         struct tevent_context *ev;
  41         struct loadparm_context *lp_ctx;
  42         struct ldb_context *sam_ctx;
  43 };
  44
  45 static int dfs_samba4_connect(struct vfs_handle_struct *handle,
  46                               const char *service, const char *user)
  47 {
  48         struct dfs_samba4_handle_data *data;
  49         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
  50
  51         if (ret < 0) {
  52                 return ret;
  53         }
  54
  55         data = talloc_zero(handle->conn, struct dfs_samba4_handle_data);
  56         if (!data) {
  57                 DEBUG(0, ("talloc_zero() failed\n"));
  58                 SMB_VFS_NEXT_DISCONNECT(handle);
  59                 return -1;
  60         }
  61
  62         data->ev = s4_event_context_init(data);
  63         if (!data->ev) {
  64                 DEBUG(0, ("s4_event_context_init failed\n"));
  65                 SMB_VFS_NEXT_DISCONNECT(handle);
  66                 return -1;
  67         }
  68
  69         data->lp_ctx = loadparm_init_s3(data, loadparm_s3_helpers());
  70         if (data->lp_ctx == NULL) {
  71                 DEBUG(0, ("loadparm_init_s3 failed\n"));
  72                 SMB_VFS_NEXT_DISCONNECT(handle);
  73                 return -1;
  74         }
  75
  76         data->sam_ctx = samdb_connect(data,
  77                                       data->ev,
  78                                       data->lp_ctx,
  79                                       system_session(data->lp_ctx),
  80                                       NULL,
  81                                       0);
  82         if (!data->sam_ctx) {
  83                 DEBUG(0, ("samdb_connect failed\n"));
  84                 SMB_VFS_NEXT_DISCONNECT(handle);
  85                 return -1;
  86         }
  87
  88         SMB_VFS_HANDLE_SET_DATA(handle, data, NULL,
  89                                 struct dfs_samba4_handle_data,
  90                                 return -1);
  91
  92         DEBUG(10,("dfs_samba4: connect to service[%s]\n",
  93                   service));
  94
  95         return 0;
  96 }
  97
  98 static void dfs_samba4_disconnect(struct vfs_handle_struct *handle)
  99 {
 100         DEBUG(10,("dfs_samba4_disconnect() connect to service[%s].\n",
 101                   lp_servicename(talloc_tos(), SNUM(handle->conn))));
 102
 103         SMB_VFS_NEXT_DISCONNECT(handle);
 104 }
 105
 106 static NTSTATUS dfs_samba4_get_referrals(struct vfs_handle_struct *handle,
 107                                          struct dfs_GetDFSReferral *r)
 108 {
 109         struct dfs_samba4_handle_data *data;
 110         NTSTATUS status;
 111
 112         SMB_VFS_HANDLE_GET_DATA(handle, data,
 113                                 struct dfs_samba4_handle_data,
 114                                 return NT_STATUS_INTERNAL_ERROR);
 115
 116         DEBUG(8, ("dfs_samba4: Requested DFS name: %s utf16-length: %u\n",
 117                    r->in.req.servername,
 118                    (unsigned int)strlen_m(r->in.req.servername)*2));
 119
 120         status = dfs_server_ad_get_referrals(data->lp_ctx,
 121                                              data->sam_ctx,
 122                                              handle->conn->sconn->remote_address,
 123                                              r);
 124         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 125                 return SMB_VFS_NEXT_GET_DFS_REFERRALS(handle, r);
 126         }
 127         if (!NT_STATUS_IS_OK(status)) {
 128                 return status;
 129         }
 130
 131         return NT_STATUS_OK;
 132 }
 133
 134 static struct vfs_fn_pointers vfs_dfs_samba4_fns = {
 135         .connect_fn = dfs_samba4_connect,
 136         .disconnect_fn = dfs_samba4_disconnect,
 137         .get_dfs_referrals_fn = dfs_samba4_get_referrals,
 138 };
 139
 140 static_decl_vfs;
 141 NTSTATUS vfs_dfs_samba4_init(TALLOC_CTX *ctx)
 142 {
 143         NTSTATUS ret;
 144
 145         ret = smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "dfs_samba4",
 146                                &vfs_dfs_samba4_fns);
 147         if (!NT_STATUS_IS_OK(ret)) {
 148                 return ret;
 149         }
 150
 151         vfs_dfs_samba4_debug_level = debug_add_class("dfs_samba4");
 152         if (vfs_dfs_samba4_debug_level == -1) {
 153                 vfs_dfs_samba4_debug_level = DBGC_VFS;
 154                 DEBUG(0, ("vfs_dfs_samba4: Couldn't register custom debugging class!\n"));
 155         } else {
 156                 DEBUG(10, ("vfs_dfs_samba4: Debug class number of 'fileid': %d\n",
 157                       vfs_dfs_samba4_debug_level));
 158         }
 159
 160         return ret;
 161 }