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