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/globals.h"
  23 #include "../libcli/smb/smb_common.h"
  24 #include "../libcli/security/security.h"
  25
  26 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
  27                                        const char *in_path,
  28                                        uint8_t *out_share_type,
  29                                        uint32_t *out_share_flags,
  30                                        uint32_t *out_capabilities,
  31                                        uint32_t *out_maximal_access,
  32                                        uint32_t *out_tree_id);
  33
  34 NTSTATUS smbd_smb2_request_process_tcon(struct smbd_smb2_request *req)
  35 {
  36         const uint8_t *inbody;
  37         int i = req->current_idx;
  38         uint8_t *outhdr;
  39         DATA_BLOB outbody;
  40         size_t expected_body_size = 0x09;
  41         size_t body_size;
  42         uint16_t in_path_offset;
  43         uint16_t in_path_length;
  44         DATA_BLOB in_path_buffer;
  45         char *in_path_string;
  46         size_t in_path_string_size;
  47         uint8_t out_share_type = 0;
  48         uint32_t out_share_flags = 0;
  49         uint32_t out_capabilities = 0;
  50         uint32_t out_maximal_access = 0;
  51         uint32_t out_tree_id = 0;
  52         NTSTATUS status;
  53         bool ok;
  54
  55         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  56                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  57         }
  58
  59         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  60
  61         body_size = SVAL(inbody, 0x00);
  62         if (body_size != expected_body_size) {
  63                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  64         }
  65
  66         in_path_offset = SVAL(inbody, 0x04);
  67         in_path_length = SVAL(inbody, 0x06);
  68
  69         if (in_path_offset != (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
  70                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  71         }
  72
  73         if (in_path_length > req->in.vector[i+2].iov_len) {
  74                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  75         }
  76
  77         in_path_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  78         in_path_buffer.length = in_path_length;
  79
  80         ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
  81                                    in_path_buffer.data,
  82                                    in_path_buffer.length,
  83                                    &in_path_string,
  84                                    &in_path_string_size, false);
  85         if (!ok) {
  86                 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
  87         }
  88
  89         status = smbd_smb2_tree_connect(req, in_path_string,
  90                                         &out_share_type,
  91                                         &out_share_flags,
  92                                         &out_capabilities,
  93                                         &out_maximal_access,
  94                                         &out_tree_id);
  95         if (!NT_STATUS_IS_OK(status)) {
  96                 return smbd_smb2_request_error(req, status);
  97         }
  98
  99         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 100
 101         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 102         if (outbody.data == NULL) {
 103                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 104         }
 105
 106         SIVAL(outhdr, SMB2_HDR_TID, out_tree_id);
 107
 108         SSVAL(outbody.data, 0x00, 0x10);        /* struct size */
 109         SCVAL(outbody.data, 0x02,
 110               out_share_type);                  /* share type */
 111         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 112         SIVAL(outbody.data, 0x04,
 113               out_share_flags);                 /* share flags */
 114         SIVAL(outbody.data, 0x08,
 115               out_capabilities);                /* capabilities */
 116         SIVAL(outbody.data, 0x0C,
 117               out_maximal_access);              /* maximal access */
 118
 119         return smbd_smb2_request_done(req, outbody, NULL);
 120 }
 121
 122 static int smbd_smb2_tcon_destructor(struct smbd_smb2_tcon *tcon)
 123 {
 124         if (tcon->session == NULL) {
 125                 return 0;
 126         }
 127
 128         idr_remove(tcon->session->tcons.idtree, tcon->tid);
 129         DLIST_REMOVE(tcon->session->tcons.list, tcon);
 130         SMB_ASSERT(tcon->session->sconn->num_tcons_open > 0);
 131         tcon->session->sconn->num_tcons_open--;
 132
 133         if (tcon->compat_conn) {
 134                 set_current_service(tcon->compat_conn, 0, true);
 135                 close_cnum(tcon->compat_conn, tcon->session->vuid);
 136         }
 137
 138         tcon->compat_conn = NULL;
 139         tcon->tid = 0;
 140         tcon->session = NULL;
 141
 142         return 0;
 143 }
 144
 145 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
 146                                        const char *in_path,
 147                                        uint8_t *out_share_type,
 148                                        uint32_t *out_share_flags,
 149                                        uint32_t *out_capabilities,
 150                                        uint32_t *out_maximal_access,
 151                                        uint32_t *out_tree_id)
 152 {
 153         const char *share = in_path;
 154         char *service = NULL;
 155         int snum = -1;
 156         struct smbd_smb2_tcon *tcon;
 157         connection_struct *compat_conn = NULL;
 158         user_struct *compat_vuser = req->session->compat_vuser;
 159         int id;
 160         NTSTATUS status;
 161
 162         if (strncmp(share, "\\\\", 2) == 0) {
 163                 const char *p = strchr(share+2, '\\');
 164                 if (p) {
 165                         share = p + 1;
 166                 }
 167         }
 168
 169         DEBUG(10,("smbd_smb2_tree_connect: path[%s] share[%s]\n",
 170                   in_path, share));
 171
 172         service = talloc_strdup(talloc_tos(), share);
 173         if(!service) {
 174                 return NT_STATUS_NO_MEMORY;
 175         }
 176
 177         strlower_m(service);
 178
 179         /* TODO: do more things... */
 180         if (strequal(service,HOMES_NAME)) {
 181                 if (compat_vuser->homes_snum == -1) {
 182                         DEBUG(2, ("[homes] share not available for "
 183                                 "user %s because it was not found "
 184                                 "or created at session setup "
 185                                 "time\n",
 186                                 compat_vuser->server_info->unix_name));
 187                         return NT_STATUS_BAD_NETWORK_NAME;
 188                 }
 189                 snum = compat_vuser->homes_snum;
 190         } else if ((compat_vuser->homes_snum != -1)
 191                    && strequal(service,
 192                         lp_servicename(compat_vuser->homes_snum))) {
 193                 snum = compat_vuser->homes_snum;
 194         } else {
 195                 snum = find_service(talloc_tos(), service, &service);
 196                 if (!service) {
 197                         return NT_STATUS_NO_MEMORY;
 198                 }
 199         }
 200
 201         if (snum < 0) {
 202                 DEBUG(3,("smbd_smb2_tree_connect: couldn't find service %s\n",
 203                          service));
 204                 return NT_STATUS_BAD_NETWORK_NAME;
 205         }
 206
 207         /* create a new tcon as child of the session */
 208         tcon = talloc_zero(req->session, struct smbd_smb2_tcon);
 209         if (tcon == NULL) {
 210                 return NT_STATUS_NO_MEMORY;
 211         }
 212         id = idr_get_new_random(req->session->tcons.idtree,
 213                                 tcon,
 214                                 req->session->tcons.limit);
 215         if (id == -1) {
 216                 TALLOC_FREE(tcon);
 217                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 218         }
 219         tcon->tid = id;
 220         tcon->snum = snum;
 221
 222         DLIST_ADD_END(req->session->tcons.list, tcon,
 223                       struct smbd_smb2_tcon *);
 224         tcon->session = req->session;
 225         tcon->session->sconn->num_tcons_open++;
 226         talloc_set_destructor(tcon, smbd_smb2_tcon_destructor);
 227
 228         compat_conn = make_connection_snum(req->sconn,
 229                                         snum, req->session->compat_vuser,
 230                                         data_blob_null, "???",
 231                                         &status);
 232         if (compat_conn == NULL) {
 233                 TALLOC_FREE(tcon);
 234                 return status;
 235         }
 236         tcon->compat_conn = talloc_move(tcon, &compat_conn);
 237         tcon->compat_conn->cnum = tcon->tid;
 238
 239         if (IS_PRINT(tcon->compat_conn)) {
 240                 *out_share_type = SMB2_SHARE_TYPE_PRINT;
 241         } else if (IS_IPC(tcon->compat_conn)) {
 242                 *out_share_type = SMB2_SHARE_TYPE_PIPE;
 243         } else {
 244                 *out_share_type = SMB2_SHARE_TYPE_DISK;
 245         }
 246
 247         *out_share_flags = SMB2_SHAREFLAG_ALLOW_NAMESPACE_CACHING;
 248
 249         if (lp_msdfs_root(SNUM(tcon->compat_conn)) && lp_host_msdfs()) {
 250                 *out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
 251                 *out_capabilities = SMB2_SHARE_CAP_DFS;
 252         } else {
 253                 *out_capabilities = 0;
 254         }
 255
 256         switch(lp_csc_policy(SNUM(tcon->compat_conn))) {
 257         case CSC_POLICY_MANUAL:
 258                 break;
 259         case CSC_POLICY_DOCUMENTS:
 260                 *out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
 261                 break;
 262         case CSC_POLICY_PROGRAMS:
 263                 *out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
 264                 break;
 265         case CSC_POLICY_DISABLE:
 266                 *out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
 267                 break;
 268         default:
 269                 break;
 270         }
 271
 272         *out_maximal_access = FILE_GENERIC_ALL;
 273
 274         *out_tree_id = tcon->tid;
 275         return NT_STATUS_OK;
 276 }
 277
 278 NTSTATUS smbd_smb2_request_check_tcon(struct smbd_smb2_request *req)
 279 {
 280         const uint8_t *inhdr;
 281         const uint8_t *outhdr;
 282         int i = req->current_idx;
 283         uint32_t in_tid;
 284         void *p;
 285         struct smbd_smb2_tcon *tcon;
 286         bool chained_fixup = false;
 287
 288         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
 289
 290         in_tid = IVAL(inhdr, SMB2_HDR_TID);
 291
 292         if (in_tid == (0xFFFFFFFF)) {
 293                 if (req->async) {
 294                         /*
 295                          * async request - fill in tid from
 296                          * already setup out.vector[].iov_base.
 297                          */
 298                         outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 299                         in_tid = IVAL(outhdr, SMB2_HDR_TID);
 300                 } else if (i > 2) {
 301                         /*
 302                          * Chained request - fill in tid from
 303                          * the previous request out.vector[].iov_base.
 304                          */
 305                         outhdr = (const uint8_t *)req->out.vector[i-3].iov_base;
 306                         in_tid = IVAL(outhdr, SMB2_HDR_TID);
 307                         chained_fixup = true;
 308                 }
 309         }
 310
 311         /* lookup an existing session */
 312         p = idr_find(req->session->tcons.idtree, in_tid);
 313         if (p == NULL) {
 314                 return NT_STATUS_NETWORK_NAME_DELETED;
 315         }
 316         tcon = talloc_get_type_abort(p, struct smbd_smb2_tcon);
 317
 318         if (!change_to_user(tcon->compat_conn,req->session->vuid)) {
 319                 return NT_STATUS_ACCESS_DENIED;
 320         }
 321
 322         /* should we pass FLAG_CASELESS_PATHNAMES here? */
 323         if (!set_current_service(tcon->compat_conn, 0, true)) {
 324                 return NT_STATUS_ACCESS_DENIED;
 325         }
 326
 327         req->tcon = tcon;
 328
 329         if (chained_fixup) {
 330                 /* Fix up our own outhdr. */
 331                 outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 332                 SIVAL(outhdr, SMB2_HDR_TID, in_tid);
 333         }
 334
 335         return NT_STATUS_OK;
 336 }
 337
 338 NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
 339 {
 340         const uint8_t *inbody;
 341         int i = req->current_idx;
 342         DATA_BLOB outbody;
 343         size_t expected_body_size = 0x04;
 344         size_t body_size;
 345
 346         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
 347                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 348         }
 349
 350         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 351
 352         body_size = SVAL(inbody, 0x00);
 353         if (body_size != expected_body_size) {
 354                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 355         }
 356
 357         /*
 358          * TODO: cancel all outstanding requests on the tcon
 359          *       and delete all file handles.
 360          */
 361         TALLOC_FREE(req->tcon);
 362
 363         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 364         if (outbody.data == NULL) {
 365                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 366         }
 367
 368         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 369         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 370
 371         return smbd_smb2_request_done(req, outbody, NULL);
 372 }