source3/smbd/smb2_tcon.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smbd/smbd.h"
  23 #include "smbd/globals.h"
  24 #include "../libcli/smb/smb_common.h"
  25 #include "../libcli/security/security.h"
  26 #include "auth.h"
  27 #include "lib/param/loadparm.h"
  28
  29 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
  30                                        const char *in_path,
  31                                        uint8_t *out_share_type,
  32                                        uint32_t *out_share_flags,
  33                                        uint32_t *out_capabilities,
  34                                        uint32_t *out_maximal_access,
  35                                        uint32_t *out_tree_id);
  36
  37 NTSTATUS smbd_smb2_request_process_tcon(struct smbd_smb2_request *req)
  38 {
  39         const uint8_t *inbody;
  40         int i = req->current_idx;
  41         uint8_t *outhdr;
  42         DATA_BLOB outbody;
  43         uint16_t in_path_offset;
  44         uint16_t in_path_length;
  45         DATA_BLOB in_path_buffer;
  46         char *in_path_string;
  47         size_t in_path_string_size;
  48         uint8_t out_share_type = 0;
  49         uint32_t out_share_flags = 0;
  50         uint32_t out_capabilities = 0;
  51         uint32_t out_maximal_access = 0;
  52         uint32_t out_tree_id = 0;
  53         NTSTATUS status;
  54         bool ok;
  55
  56         status = smbd_smb2_request_verify_sizes(req, 0x09);
  57         if (!NT_STATUS_IS_OK(status)) {
  58                 return smbd_smb2_request_error(req, status);
  59         }
  60         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  61
  62         in_path_offset = SVAL(inbody, 0x04);
  63         in_path_length = SVAL(inbody, 0x06);
  64
  65         if (in_path_offset != (SMB2_HDR_BODY + req->in.vector[i+1].iov_len)) {
  66                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  67         }
  68
  69         if (in_path_length > req->in.vector[i+2].iov_len) {
  70                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  71         }
  72
  73         in_path_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  74         in_path_buffer.length = in_path_length;
  75
  76         ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
  77                                    in_path_buffer.data,
  78                                    in_path_buffer.length,
  79                                    &in_path_string,
  80                                    &in_path_string_size);
  81         if (!ok) {
  82                 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
  83         }
  84
  85         if (in_path_buffer.length == 0) {
  86                 in_path_string_size = 0;
  87         }
  88
  89         if (strlen(in_path_string) != in_path_string_size) {
  90                 return smbd_smb2_request_error(req, NT_STATUS_BAD_NETWORK_NAME);
  91         }
  92
  93         status = smbd_smb2_tree_connect(req, in_path_string,
  94                                         &out_share_type,
  95                                         &out_share_flags,
  96                                         &out_capabilities,
  97                                         &out_maximal_access,
  98                                         &out_tree_id);
  99         if (!NT_STATUS_IS_OK(status)) {
 100                 return smbd_smb2_request_error(req, status);
 101         }
 102
 103         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 104
 105         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 106         if (outbody.data == NULL) {
 107                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 108         }
 109
 110         SIVAL(outhdr, SMB2_HDR_TID, out_tree_id);
 111
 112         SSVAL(outbody.data, 0x00, 0x10);        /* struct size */
 113         SCVAL(outbody.data, 0x02,
 114               out_share_type);                  /* share type */
 115         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 116         SIVAL(outbody.data, 0x04,
 117               out_share_flags);                 /* share flags */
 118         SIVAL(outbody.data, 0x08,
 119               out_capabilities);                /* capabilities */
 120         SIVAL(outbody.data, 0x0C,
 121               out_maximal_access);              /* maximal access */
 122
 123         return smbd_smb2_request_done(req, outbody, NULL);
 124 }
 125
 126 static int smbd_smb2_tcon_destructor(struct smbd_smb2_tcon *tcon)
 127 {
 128         if (tcon->session == NULL) {
 129                 return 0;
 130         }
 131
 132         idr_remove(tcon->session->tcons.idtree, tcon->tid);
 133         DLIST_REMOVE(tcon->session->tcons.list, tcon);
 134
 135         if (tcon->compat_conn) {
 136                 set_current_service(tcon->compat_conn, 0, true);
 137                 close_cnum(tcon->compat_conn, tcon->session->vuid);
 138         }
 139
 140         tcon->compat_conn = NULL;
 141         tcon->tid = 0;
 142         tcon->session = NULL;
 143
 144         return 0;
 145 }
 146
 147 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
 148                                        const char *in_path,
 149                                        uint8_t *out_share_type,
 150                                        uint32_t *out_share_flags,
 151                                        uint32_t *out_capabilities,
 152                                        uint32_t *out_maximal_access,
 153                                        uint32_t *out_tree_id)
 154 {
 155         const char *share = in_path;
 156         char *service = NULL;
 157         int snum = -1;
 158         struct smbd_smb2_tcon *tcon;
 159         connection_struct *compat_conn = NULL;
 160         user_struct *compat_vuser = req->session->compat_vuser;
 161         int id;
 162         NTSTATUS status;
 163
 164         if (strncmp(share, "\\\\", 2) == 0) {
 165                 const char *p = strchr(share+2, '\\');
 166                 if (p) {
 167                         share = p + 1;
 168                 }
 169         }
 170
 171         DEBUG(10,("smbd_smb2_tree_connect: path[%s] share[%s]\n",
 172                   in_path, share));
 173
 174         service = talloc_strdup(talloc_tos(), share);
 175         if(!service) {
 176                 return NT_STATUS_NO_MEMORY;
 177         }
 178
 179         strlower_m(service);
 180
 181         /* TODO: do more things... */
 182         if (strequal(service,HOMES_NAME)) {
 183                 if (compat_vuser->homes_snum == -1) {
 184                         DEBUG(2, ("[homes] share not available for "
 185                                 "user %s because it was not found "
 186                                 "or created at session setup "
 187                                 "time\n",
 188                                 compat_vuser->session_info->unix_info->unix_name));
 189                         return NT_STATUS_BAD_NETWORK_NAME;
 190                 }
 191                 snum = compat_vuser->homes_snum;
 192         } else if ((compat_vuser->homes_snum != -1)
 193                    && strequal(service,
 194                         lp_servicename(compat_vuser->homes_snum))) {
 195                 snum = compat_vuser->homes_snum;
 196         } else {
 197                 snum = find_service(talloc_tos(), service, &service);
 198                 if (!service) {
 199                         return NT_STATUS_NO_MEMORY;
 200                 }
 201         }
 202
 203         if (snum < 0) {
 204                 DEBUG(3,("smbd_smb2_tree_connect: couldn't find service %s\n",
 205                          service));
 206                 return NT_STATUS_BAD_NETWORK_NAME;
 207         }
 208
 209         /* create a new tcon as child of the session */
 210         tcon = talloc_zero(req->session, struct smbd_smb2_tcon);
 211         if (tcon == NULL) {
 212                 return NT_STATUS_NO_MEMORY;
 213         }
 214         id = idr_get_new_random(req->session->tcons.idtree,
 215                                 tcon,
 216                                 req->session->tcons.limit);
 217         if (id == -1) {
 218                 TALLOC_FREE(tcon);
 219                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 220         }
 221         tcon->tid = id;
 222         tcon->snum = snum;
 223
 224         DLIST_ADD_END(req->session->tcons.list, tcon,
 225                       struct smbd_smb2_tcon *);
 226         tcon->session = req->session;
 227         talloc_set_destructor(tcon, smbd_smb2_tcon_destructor);
 228
 229         compat_conn = make_connection_smb2(req->sconn,
 230                                         tcon,
 231                                         req->session->compat_vuser,
 232                                         "???",
 233                                         &status);
 234         if (compat_conn == NULL) {
 235                 TALLOC_FREE(tcon);
 236                 return status;
 237         }
 238         tcon->compat_conn = talloc_move(tcon, &compat_conn);
 239
 240         if (IS_PRINT(tcon->compat_conn)) {
 241                 *out_share_type = SMB2_SHARE_TYPE_PRINT;
 242         } else if (IS_IPC(tcon->compat_conn)) {
 243                 *out_share_type = SMB2_SHARE_TYPE_PIPE;
 244         } else {
 245                 *out_share_type = SMB2_SHARE_TYPE_DISK;
 246         }
 247
 248         *out_share_flags = 0;
 249
 250         if (lp_msdfs_root(SNUM(tcon->compat_conn)) && lp_host_msdfs()) {
 251                 *out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
 252                 *out_capabilities = SMB2_SHARE_CAP_DFS;
 253         } else {
 254                 *out_capabilities = 0;
 255         }
 256
 257         switch(lp_csc_policy(SNUM(tcon->compat_conn))) {
 258         case CSC_POLICY_MANUAL:
 259                 break;
 260         case CSC_POLICY_DOCUMENTS:
 261                 *out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
 262                 break;
 263         case CSC_POLICY_PROGRAMS:
 264                 *out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
 265                 break;
 266         case CSC_POLICY_DISABLE:
 267                 *out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
 268                 break;
 269         default:
 270                 break;
 271         }
 272
 273         if (lp_hideunreadable(SNUM(tcon->compat_conn)) ||
 274             lp_hideunwriteable_files(SNUM(tcon->compat_conn))) {
 275                 *out_share_flags |= SMB2_SHAREFLAG_ACCESS_BASED_DIRECTORY_ENUM;
 276         }
 277
 278         *out_maximal_access = tcon->compat_conn->share_access;
 279
 280         *out_tree_id = tcon->tid;
 281         return NT_STATUS_OK;
 282 }
 283
 284 NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
 285 {
 286         NTSTATUS status;
 287         DATA_BLOB outbody;
 288
 289         status = smbd_smb2_request_verify_sizes(req, 0x04);
 290         if (!NT_STATUS_IS_OK(status)) {
 291                 return smbd_smb2_request_error(req, status);
 292         }
 293
 294         /*
 295          * TODO: cancel all outstanding requests on the tcon
 296          *       and delete all file handles.
 297          */
 298         TALLOC_FREE(req->tcon);
 299
 300         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 301         if (outbody.data == NULL) {
 302                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 303         }
 304
 305         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 306         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 307
 308         return smbd_smb2_request_done(req, outbody, NULL);
 309 }