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
 131         if (tcon->compat_conn) {
 132                 set_current_service(tcon->compat_conn, 0, true);
 133                 close_cnum(tcon->compat_conn, tcon->session->vuid);
 134         }
 135
 136         tcon->compat_conn = NULL;
 137         tcon->tid = 0;
 138         tcon->session = NULL;
 139
 140         return 0;
 141 }
 142
 143 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
 144                                        const char *in_path,
 145                                        uint8_t *out_share_type,
 146                                        uint32_t *out_share_flags,
 147                                        uint32_t *out_capabilities,
 148                                        uint32_t *out_maximal_access,
 149                                        uint32_t *out_tree_id)
 150 {
 151         const char *share = in_path;
 152         fstring service;
 153         int snum = -1;
 154         struct smbd_smb2_tcon *tcon;
 155         connection_struct *compat_conn = NULL;
 156         user_struct *compat_vuser = req->session->compat_vuser;
 157         int id;
 158         NTSTATUS status;
 159
 160         if (strncmp(share, "\\\\", 2) == 0) {
 161                 const char *p = strchr(share+2, '\\');
 162                 if (p) {
 163                         share = p + 1;
 164                 }
 165         }
 166
 167         DEBUG(10,("smbd_smb2_tree_connect: path[%s] share[%s]\n",
 168                   in_path, share));
 169
 170         fstrcpy(service, share);
 171
 172         strlower_m(service);
 173
 174         /* TODO: do more things... */
 175         if (strequal(service,HOMES_NAME)) {
 176                 if (compat_vuser->homes_snum == -1) {
 177                         DEBUG(2, ("[homes] share not available for "
 178                                 "user %s because it was not found "
 179                                 "or created at session setup "
 180                                 "time\n",
 181                                 compat_vuser->server_info->unix_name));
 182                         return NT_STATUS_BAD_NETWORK_NAME;
 183                 }
 184                 snum = compat_vuser->homes_snum;
 185         } else if ((compat_vuser->homes_snum != -1)
 186                    && strequal(service,
 187                         lp_servicename(compat_vuser->homes_snum))) {
 188                 snum = compat_vuser->homes_snum;
 189         } else {
 190                 snum = find_service(service);
 191         }
 192
 193         if (snum < 0) {
 194                 DEBUG(3,("smbd_smb2_tree_connect: couldn't find service %s\n",
 195                          service));
 196                 return NT_STATUS_BAD_NETWORK_NAME;
 197         }
 198
 199         /* create a new tcon as child of the session */
 200         tcon = talloc_zero(req->session, struct smbd_smb2_tcon);
 201         if (tcon == NULL) {
 202                 return NT_STATUS_NO_MEMORY;
 203         }
 204         id = idr_get_new_random(req->session->tcons.idtree,
 205                                 tcon,
 206                                 req->session->tcons.limit);
 207         if (id == -1) {
 208                 TALLOC_FREE(tcon);
 209                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 210         }
 211         tcon->tid = id;
 212         tcon->snum = snum;
 213
 214         DLIST_ADD_END(req->session->tcons.list, tcon,
 215                       struct smbd_smb2_tcon *);
 216         tcon->session = req->session;
 217         talloc_set_destructor(tcon, smbd_smb2_tcon_destructor);
 218
 219         compat_conn = make_connection_snum(req->sconn,
 220                                         snum, req->session->compat_vuser,
 221                                         data_blob_null, "???",
 222                                         &status);
 223         if (compat_conn == NULL) {
 224                 TALLOC_FREE(tcon);
 225                 return status;
 226         }
 227         tcon->compat_conn = talloc_move(tcon, &compat_conn);
 228         tcon->compat_conn->cnum = tcon->tid;
 229
 230         if (IS_PRINT(tcon->compat_conn)) {
 231                 *out_share_type = SMB2_SHARE_TYPE_PRINT;
 232         } else if (IS_IPC(tcon->compat_conn)) {
 233                 *out_share_type = SMB2_SHARE_TYPE_PIPE;
 234         } else {
 235                 *out_share_type = SMB2_SHARE_TYPE_DISK;
 236         }
 237
 238         *out_share_flags = SMB2_SHAREFLAG_ALLOW_NAMESPACE_CACHING;
 239
 240         if (lp_msdfs_root(SNUM(tcon->compat_conn)) && lp_host_msdfs()) {
 241                 *out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
 242                 *out_capabilities = SMB2_SHARE_CAP_DFS;
 243         } else {
 244                 *out_capabilities = 0;
 245         }
 246
 247         switch(lp_csc_policy(SNUM(tcon->compat_conn))) {
 248         case CSC_POLICY_MANUAL:
 249                 break;
 250         case CSC_POLICY_DOCUMENTS:
 251                 *out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
 252                 break;
 253         case CSC_POLICY_PROGRAMS:
 254                 *out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
 255                 break;
 256         case CSC_POLICY_DISABLE:
 257                 *out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
 258                 break;
 259         default:
 260                 break;
 261         }
 262
 263         *out_maximal_access = FILE_GENERIC_ALL;
 264
 265         *out_tree_id = tcon->tid;
 266         return NT_STATUS_OK;
 267 }
 268
 269 NTSTATUS smbd_smb2_request_check_tcon(struct smbd_smb2_request *req)
 270 {
 271         const uint8_t *inhdr;
 272         const uint8_t *outhdr;
 273         int i = req->current_idx;
 274         uint32_t in_tid;
 275         void *p;
 276         struct smbd_smb2_tcon *tcon;
 277         bool chained_fixup = false;
 278
 279         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
 280
 281         in_tid = IVAL(inhdr, SMB2_HDR_TID);
 282
 283         if (in_tid == (0xFFFFFFFF)) {
 284                 if (req->async) {
 285                         /*
 286                          * async request - fill in tid from
 287                          * already setup out.vector[].iov_base.
 288                          */
 289                         outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 290                         in_tid = IVAL(outhdr, SMB2_HDR_TID);
 291                 } else if (i > 2) {
 292                         /*
 293                          * Chained request - fill in tid from
 294                          * the previous request out.vector[].iov_base.
 295                          */
 296                         outhdr = (const uint8_t *)req->out.vector[i-3].iov_base;
 297                         in_tid = IVAL(outhdr, SMB2_HDR_TID);
 298                         chained_fixup = true;
 299                 }
 300         }
 301
 302         /* lookup an existing session */
 303         p = idr_find(req->session->tcons.idtree, in_tid);
 304         if (p == NULL) {
 305                 return NT_STATUS_NETWORK_NAME_DELETED;
 306         }
 307         tcon = talloc_get_type_abort(p, struct smbd_smb2_tcon);
 308
 309         if (!change_to_user(tcon->compat_conn,req->session->vuid)) {
 310                 return NT_STATUS_ACCESS_DENIED;
 311         }
 312
 313         /* should we pass FLAG_CASELESS_PATHNAMES here? */
 314         if (!set_current_service(tcon->compat_conn, 0, true)) {
 315                 return NT_STATUS_ACCESS_DENIED;
 316         }
 317
 318         req->tcon = tcon;
 319
 320         if (chained_fixup) {
 321                 /* Fix up our own outhdr. */
 322                 outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 323                 SIVAL(outhdr, SMB2_HDR_TID, in_tid);
 324         }
 325
 326         return NT_STATUS_OK;
 327 }
 328
 329 NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
 330 {
 331         const uint8_t *inbody;
 332         int i = req->current_idx;
 333         DATA_BLOB outbody;
 334         size_t expected_body_size = 0x04;
 335         size_t body_size;
 336
 337         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
 338                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 339         }
 340
 341         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 342
 343         body_size = SVAL(inbody, 0x00);
 344         if (body_size != expected_body_size) {
 345                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 346         }
 347
 348         /*
 349          * TODO: cancel all outstanding requests on the tcon
 350          *       and delete all file handles.
 351          */
 352         TALLOC_FREE(req->tcon);
 353
 354         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 355         if (outbody.data == NULL) {
 356                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 357         }
 358
 359         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 360         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 361
 362         return smbd_smb2_request_done(req, outbody, NULL);
 363 }