source3/modules/vfs_dfs_samba4.c

   1 /*
   2  * VFS module to retrieve DFS referrals from AD
   3  *
   4  * Copyright (C) 2007, Stefan Metzmacher
   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 "system/filesys.h"
  24 #include "source3/include/msdfs.h"
  25 #include "librpc/gen_ndr/ndr_dfsblobs.h"
  26 #include "source4/lib/events/events.h"
  27 #include "source4/auth/session.h"
  28 #include "lib/param/param.h"
  29 #include "source4/dsdb/samdb/samdb.h"
  30 #include "dfs_server/dfs_server_ad.h"
  31
  32 static int vfs_dfs_samba4_debug_level = DBGC_VFS;
  33
  34 #undef DBGC_CLASS
  35 #define DBGC_CLASS vfs_dfs_samba4_debug_level
  36
  37 struct dfs_samba4_handle_data {
  38         struct tevent_context *ev;
  39         struct loadparm_context *lp_ctx;
  40         struct ldb_context *sam_ctx;
  41 };
  42
  43 static int dfs_samba4_connect(struct vfs_handle_struct *handle,
  44                               const char *service, const char *user)
  45 {
  46         struct dfs_samba4_handle_data *data;
  47         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
  48
  49         if (ret < 0) {
  50                 return ret;
  51         }
  52
  53         data = talloc_zero(handle->conn, struct dfs_samba4_handle_data);
  54         if (!data) {
  55                 DEBUG(0, ("talloc_zero() failed\n"));
  56                 SMB_VFS_NEXT_DISCONNECT(handle);
  57                 return -1;
  58         }
  59
  60         data->ev = s4_event_context_init(data);
  61         if (!data->ev) {
  62                 DEBUG(0, ("s4_event_context_init failed\n"));
  63                 SMB_VFS_NEXT_DISCONNECT(handle);
  64                 return -1;
  65         }
  66
  67         data->lp_ctx = loadparm_init_s3(data, loadparm_s3_helpers());
  68         if (data->lp_ctx == NULL) {
  69                 DEBUG(0, ("loadparm_init_s3 failed\n"));
  70                 SMB_VFS_NEXT_DISCONNECT(handle);
  71                 return -1;
  72         }
  73
  74         data->sam_ctx = samdb_connect(data,
  75                                       data->ev,
  76                                       data->lp_ctx,
  77                                       system_session(data->lp_ctx),
  78                                       NULL,
  79                                       0);
  80         if (!data->sam_ctx) {
  81                 DEBUG(0, ("samdb_connect failed\n"));
  82                 SMB_VFS_NEXT_DISCONNECT(handle);
  83                 return -1;
  84         }
  85
  86         SMB_VFS_HANDLE_SET_DATA(handle, data, NULL,
  87                                 struct dfs_samba4_handle_data,
  88                                 return -1);
  89
  90         DEBUG(10,("dfs_samba4: connect to service[%s]\n",
  91                   service));
  92
  93         return 0;
  94 }
  95
  96 static void dfs_samba4_disconnect(struct vfs_handle_struct *handle)
  97 {
  98         const struct loadparm_substitution *lp_sub =
  99                 loadparm_s3_global_substitution();
 100
 101         DEBUG(10,("dfs_samba4_disconnect() connect to service[%s].\n",
 102                   lp_servicename(talloc_tos(), lp_sub, SNUM(handle->conn))));
 103
 104         SMB_VFS_NEXT_DISCONNECT(handle);
 105 }
 106
 107 static NTSTATUS dfs_samba4_get_referrals(struct vfs_handle_struct *handle,
 108                                          struct dfs_GetDFSReferral *r)
 109 {
 110         struct dfs_samba4_handle_data *data;
 111         NTSTATUS status;
 112
 113         SMB_VFS_HANDLE_GET_DATA(handle, data,
 114                                 struct dfs_samba4_handle_data,
 115                                 return NT_STATUS_INTERNAL_ERROR);
 116
 117         DEBUG(8, ("dfs_samba4: Requested DFS name: %s utf16-length: %u\n",
 118                    r->in.req.servername,
 119                    (unsigned int)strlen_m(r->in.req.servername)*2));
 120
 121         status = dfs_server_ad_get_referrals(data->lp_ctx,
 122                                              data->sam_ctx,
 123                                              handle->conn->sconn->remote_address,
 124                                              r);
 125         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 126                 return SMB_VFS_NEXT_GET_DFS_REFERRALS(handle, r);
 127         }
 128         if (!NT_STATUS_IS_OK(status)) {
 129                 return status;
 130         }
 131
 132         return NT_STATUS_OK;
 133 }
 134
 135 static struct vfs_fn_pointers vfs_dfs_samba4_fns = {
 136         .connect_fn = dfs_samba4_connect,
 137         .disconnect_fn = dfs_samba4_disconnect,
 138         .get_dfs_referrals_fn = dfs_samba4_get_referrals,
 139 };
 140
 141 static_decl_vfs;
 142 NTSTATUS vfs_dfs_samba4_init(TALLOC_CTX *ctx)
 143 {
 144         NTSTATUS ret;
 145
 146         ret = smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "dfs_samba4",
 147                                &vfs_dfs_samba4_fns);
 148         if (!NT_STATUS_IS_OK(ret)) {
 149                 return ret;
 150         }
 151
 152         vfs_dfs_samba4_debug_level = debug_add_class("dfs_samba4");
 153         if (vfs_dfs_samba4_debug_level == -1) {
 154                 vfs_dfs_samba4_debug_level = DBGC_VFS;
 155                 DEBUG(0, ("vfs_dfs_samba4: Couldn't register custom debugging class!\n"));
 156         } else {
 157                 DEBUG(10, ("vfs_dfs_samba4: Debug class number of 'fileid': %d\n",
 158                       vfs_dfs_samba4_debug_level));
 159         }
 160
 161         return ret;
 162 }