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
  28 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
  29                                        const char *in_path,
  30                                        uint8_t *out_share_type,
  31                                        uint32_t *out_share_flags,
  32                                        uint32_t *out_capabilities,
  33                                        uint32_t *out_maximal_access,
  34                                        uint32_t *out_tree_id);
  35
  36 NTSTATUS smbd_smb2_request_process_tcon(struct smbd_smb2_request *req)
  37 {
  38         const uint8_t *inbody;
  39         int i = req->current_idx;
  40         uint8_t *outhdr;
  41         DATA_BLOB outbody;
  42         size_t expected_body_size = 0x09;
  43         size_t body_size;
  44         uint16_t in_path_offset;
  45         uint16_t in_path_length;
  46         DATA_BLOB in_path_buffer;
  47         char *in_path_string;
  48         size_t in_path_string_size;
  49         uint8_t out_share_type = 0;
  50         uint32_t out_share_flags = 0;
  51         uint32_t out_capabilities = 0;
  52         uint32_t out_maximal_access = 0;
  53         uint32_t out_tree_id = 0;
  54         NTSTATUS status;
  55         bool ok;
  56
  57         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  58                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  59         }
  60
  61         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  62
  63         body_size = SVAL(inbody, 0x00);
  64         if (body_size != expected_body_size) {
  65                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  66         }
  67
  68         in_path_offset = SVAL(inbody, 0x04);
  69         in_path_length = SVAL(inbody, 0x06);
  70
  71         if (in_path_offset != (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
  72                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  73         }
  74
  75         if (in_path_length > req->in.vector[i+2].iov_len) {
  76                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  77         }
  78
  79         in_path_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  80         in_path_buffer.length = in_path_length;
  81
  82         ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
  83                                    in_path_buffer.data,
  84                                    in_path_buffer.length,
  85                                    &in_path_string,
  86                                    &in_path_string_size, false);
  87         if (!ok) {
  88                 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
  89         }
  90
  91         status = smbd_smb2_tree_connect(req, in_path_string,
  92                                         &out_share_type,
  93                                         &out_share_flags,
  94                                         &out_capabilities,
  95                                         &out_maximal_access,
  96                                         &out_tree_id);
  97         if (!NT_STATUS_IS_OK(status)) {
  98                 return smbd_smb2_request_error(req, status);
  99         }
 100
 101         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 102
 103         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 104         if (outbody.data == NULL) {
 105                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 106         }
 107
 108         SIVAL(outhdr, SMB2_HDR_TID, out_tree_id);
 109
 110         SSVAL(outbody.data, 0x00, 0x10);        /* struct size */
 111         SCVAL(outbody.data, 0x02,
 112               out_share_type);                  /* share type */
 113         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 114         SIVAL(outbody.data, 0x04,
 115               out_share_flags);                 /* share flags */
 116         SIVAL(outbody.data, 0x08,
 117               out_capabilities);                /* capabilities */
 118         SIVAL(outbody.data, 0x0C,
 119               out_maximal_access);              /* maximal access */
 120
 121         return smbd_smb2_request_done(req, outbody, NULL);
 122 }
 123
 124 static int smbd_smb2_tcon_destructor(struct smbd_smb2_tcon *tcon)
 125 {
 126         if (tcon->session == NULL) {
 127                 return 0;
 128         }
 129
 130         idr_remove(tcon->session->tcons.idtree, tcon->tid);
 131         DLIST_REMOVE(tcon->session->tcons.list, tcon);
 132         SMB_ASSERT(tcon->session->sconn->num_tcons_open > 0);
 133         tcon->session->sconn->num_tcons_open--;
 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_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         tcon->session->sconn->num_tcons_open++;
 228         talloc_set_destructor(tcon, smbd_smb2_tcon_destructor);
 229
 230         compat_conn = make_connection_snum(req->sconn,
 231                                         snum, req->session->compat_vuser,
 232                                         data_blob_null, "???",
 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         tcon->compat_conn->cnum = tcon->tid;
 240
 241         if (IS_PRINT(tcon->compat_conn)) {
 242                 *out_share_type = SMB2_SHARE_TYPE_PRINT;
 243         } else if (IS_IPC(tcon->compat_conn)) {
 244                 *out_share_type = SMB2_SHARE_TYPE_PIPE;
 245         } else {
 246                 *out_share_type = SMB2_SHARE_TYPE_DISK;
 247         }
 248
 249         *out_share_flags = SMB2_SHAREFLAG_ALLOW_NAMESPACE_CACHING;
 250
 251         if (lp_msdfs_root(SNUM(tcon->compat_conn)) && lp_host_msdfs()) {
 252                 *out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
 253                 *out_capabilities = SMB2_SHARE_CAP_DFS;
 254         } else {
 255                 *out_capabilities = 0;
 256         }
 257
 258         switch(lp_csc_policy(SNUM(tcon->compat_conn))) {
 259         case CSC_POLICY_MANUAL:
 260                 break;
 261         case CSC_POLICY_DOCUMENTS:
 262                 *out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
 263                 break;
 264         case CSC_POLICY_PROGRAMS:
 265                 *out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
 266                 break;
 267         case CSC_POLICY_DISABLE:
 268                 *out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
 269                 break;
 270         default:
 271                 break;
 272         }
 273
 274         *out_maximal_access = tcon->compat_conn->share_access;
 275
 276         *out_tree_id = tcon->tid;
 277         return NT_STATUS_OK;
 278 }
 279
 280 NTSTATUS smbd_smb2_request_check_tcon(struct smbd_smb2_request *req)
 281 {
 282         const uint8_t *inhdr;
 283         const uint8_t *outhdr;
 284         int i = req->current_idx;
 285         uint32_t in_tid;
 286         void *p;
 287         struct smbd_smb2_tcon *tcon;
 288         bool chained_fixup = false;
 289
 290         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
 291
 292         in_tid = IVAL(inhdr, SMB2_HDR_TID);
 293
 294         if (in_tid == (0xFFFFFFFF)) {
 295                 if (req->async) {
 296                         /*
 297                          * async request - fill in tid from
 298                          * already setup out.vector[].iov_base.
 299                          */
 300                         outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 301                         in_tid = IVAL(outhdr, SMB2_HDR_TID);
 302                 } else if (i > 2) {
 303                         /*
 304                          * Chained request - fill in tid from
 305                          * the previous request out.vector[].iov_base.
 306                          */
 307                         outhdr = (const uint8_t *)req->out.vector[i-3].iov_base;
 308                         in_tid = IVAL(outhdr, SMB2_HDR_TID);
 309                         chained_fixup = true;
 310                 }
 311         }
 312
 313         /* lookup an existing session */
 314         p = idr_find(req->session->tcons.idtree, in_tid);
 315         if (p == NULL) {
 316                 return NT_STATUS_NETWORK_NAME_DELETED;
 317         }
 318         tcon = talloc_get_type_abort(p, struct smbd_smb2_tcon);
 319
 320         if (!change_to_user(tcon->compat_conn,req->session->vuid)) {
 321                 return NT_STATUS_ACCESS_DENIED;
 322         }
 323
 324         /* should we pass FLAG_CASELESS_PATHNAMES here? */
 325         if (!set_current_service(tcon->compat_conn, 0, true)) {
 326                 return NT_STATUS_ACCESS_DENIED;
 327         }
 328
 329         req->tcon = tcon;
 330
 331         if (chained_fixup) {
 332                 /* Fix up our own outhdr. */
 333                 outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 334                 SIVAL(outhdr, SMB2_HDR_TID, in_tid);
 335         }
 336
 337         return NT_STATUS_OK;
 338 }
 339
 340 NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
 341 {
 342         const uint8_t *inbody;
 343         int i = req->current_idx;
 344         DATA_BLOB outbody;
 345         size_t expected_body_size = 0x04;
 346         size_t body_size;
 347
 348         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
 349                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 350         }
 351
 352         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 353
 354         body_size = SVAL(inbody, 0x00);
 355         if (body_size != expected_body_size) {
 356                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 357         }
 358
 359         /*
 360          * TODO: cancel all outstanding requests on the tcon
 361          *       and delete all file handles.
 362          */
 363         TALLOC_FREE(req->tcon);
 364
 365         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 366         if (outbody.data == NULL) {
 367                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 368         }
 369
 370         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 371         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 372
 373         return smbd_smb2_request_done(req, outbody, NULL);
 374 }