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         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         status = smbd_smb2_request_verify_sizes(req, 0x09);
  56         if (!NT_STATUS_IS_OK(status)) {
  57                 return smbd_smb2_request_error(req, status);
  58         }
  59         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  60
  61         in_path_offset = SVAL(inbody, 0x04);
  62         in_path_length = SVAL(inbody, 0x06);
  63
  64         if (in_path_offset != (SMB2_HDR_BODY + req->in.vector[i+1].iov_len)) {
  65                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  66         }
  67
  68         if (in_path_length > req->in.vector[i+2].iov_len) {
  69                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  70         }
  71
  72         in_path_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  73         in_path_buffer.length = in_path_length;
  74
  75         ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
  76                                    in_path_buffer.data,
  77                                    in_path_buffer.length,
  78                                    &in_path_string,
  79                                    &in_path_string_size, false);
  80         if (!ok) {
  81                 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
  82         }
  83
  84         if (in_path_buffer.length == 0) {
  85                 in_path_string_size = 0;
  86         }
  87
  88         if (strlen(in_path_string) != in_path_string_size) {
  89                 return smbd_smb2_request_error(req, NT_STATUS_BAD_NETWORK_NAME);
  90         }
  91
  92         status = smbd_smb2_tree_connect(req, in_path_string,
  93                                         &out_share_type,
  94                                         &out_share_flags,
  95                                         &out_capabilities,
  96                                         &out_maximal_access,
  97                                         &out_tree_id);
  98         if (!NT_STATUS_IS_OK(status)) {
  99                 return smbd_smb2_request_error(req, status);
 100         }
 101
 102         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 103
 104         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 105         if (outbody.data == NULL) {
 106                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 107         }
 108
 109         SIVAL(outhdr, SMB2_HDR_TID, out_tree_id);
 110
 111         SSVAL(outbody.data, 0x00, 0x10);        /* struct size */
 112         SCVAL(outbody.data, 0x02,
 113               out_share_type);                  /* share type */
 114         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 115         SIVAL(outbody.data, 0x04,
 116               out_share_flags);                 /* share flags */
 117         SIVAL(outbody.data, 0x08,
 118               out_capabilities);                /* capabilities */
 119         SIVAL(outbody.data, 0x0C,
 120               out_maximal_access);              /* maximal access */
 121
 122         return smbd_smb2_request_done(req, outbody, NULL);
 123 }
 124
 125 static int smbd_smb2_tcon_destructor(struct smbd_smb2_tcon *tcon)
 126 {
 127         if (tcon->session == NULL) {
 128                 return 0;
 129         }
 130
 131         idr_remove(tcon->session->tcons.idtree, tcon->tid);
 132         DLIST_REMOVE(tcon->session->tcons.list, tcon);
 133         SMB_ASSERT(tcon->session->sconn->num_tcons_open > 0);
 134         tcon->session->sconn->num_tcons_open--;
 135
 136         if (tcon->compat_conn) {
 137                 set_current_service(tcon->compat_conn, 0, true);
 138                 close_cnum(tcon->compat_conn, tcon->session->vuid);
 139         }
 140
 141         tcon->compat_conn = NULL;
 142         tcon->tid = 0;
 143         tcon->session = NULL;
 144
 145         return 0;
 146 }
 147
 148 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
 149                                        const char *in_path,
 150                                        uint8_t *out_share_type,
 151                                        uint32_t *out_share_flags,
 152                                        uint32_t *out_capabilities,
 153                                        uint32_t *out_maximal_access,
 154                                        uint32_t *out_tree_id)
 155 {
 156         const char *share = in_path;
 157         char *service = NULL;
 158         int snum = -1;
 159         struct smbd_smb2_tcon *tcon;
 160         connection_struct *compat_conn = NULL;
 161         user_struct *compat_vuser = req->session->compat_vuser;
 162         int id;
 163         NTSTATUS status;
 164
 165         if (strncmp(share, "\\\\", 2) == 0) {
 166                 const char *p = strchr(share+2, '\\');
 167                 if (p) {
 168                         share = p + 1;
 169                 }
 170         }
 171
 172         DEBUG(10,("smbd_smb2_tree_connect: path[%s] share[%s]\n",
 173                   in_path, share));
 174
 175         service = talloc_strdup(talloc_tos(), share);
 176         if(!service) {
 177                 return NT_STATUS_NO_MEMORY;
 178         }
 179
 180         strlower_m(service);
 181
 182         /* TODO: do more things... */
 183         if (strequal(service,HOMES_NAME)) {
 184                 if (compat_vuser->homes_snum == -1) {
 185                         DEBUG(2, ("[homes] share not available for "
 186                                 "user %s because it was not found "
 187                                 "or created at session setup "
 188                                 "time\n",
 189                                 compat_vuser->session_info->unix_name));
 190                         return NT_STATUS_BAD_NETWORK_NAME;
 191                 }
 192                 snum = compat_vuser->homes_snum;
 193         } else if ((compat_vuser->homes_snum != -1)
 194                    && strequal(service,
 195                         lp_servicename(compat_vuser->homes_snum))) {
 196                 snum = compat_vuser->homes_snum;
 197         } else {
 198                 snum = find_service(talloc_tos(), service, &service);
 199                 if (!service) {
 200                         return NT_STATUS_NO_MEMORY;
 201                 }
 202         }
 203
 204         if (snum < 0) {
 205                 DEBUG(3,("smbd_smb2_tree_connect: couldn't find service %s\n",
 206                          service));
 207                 return NT_STATUS_BAD_NETWORK_NAME;
 208         }
 209
 210         /* create a new tcon as child of the session */
 211         tcon = talloc_zero(req->session, struct smbd_smb2_tcon);
 212         if (tcon == NULL) {
 213                 return NT_STATUS_NO_MEMORY;
 214         }
 215         id = idr_get_new_random(req->session->tcons.idtree,
 216                                 tcon,
 217                                 req->session->tcons.limit);
 218         if (id == -1) {
 219                 TALLOC_FREE(tcon);
 220                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 221         }
 222         tcon->tid = id;
 223         tcon->snum = snum;
 224
 225         DLIST_ADD_END(req->session->tcons.list, tcon,
 226                       struct smbd_smb2_tcon *);
 227         tcon->session = req->session;
 228         tcon->session->sconn->num_tcons_open++;
 229         talloc_set_destructor(tcon, smbd_smb2_tcon_destructor);
 230
 231         compat_conn = make_connection_smb2(req->sconn,
 232                                         tcon,
 233                                         req->session->compat_vuser,
 234                                         data_blob_null, "???",
 235                                         &status);
 236         if (compat_conn == NULL) {
 237                 TALLOC_FREE(tcon);
 238                 return status;
 239         }
 240         tcon->compat_conn = talloc_move(tcon, &compat_conn);
 241
 242         if (IS_PRINT(tcon->compat_conn)) {
 243                 *out_share_type = SMB2_SHARE_TYPE_PRINT;
 244         } else if (IS_IPC(tcon->compat_conn)) {
 245                 *out_share_type = SMB2_SHARE_TYPE_PIPE;
 246         } else {
 247                 *out_share_type = SMB2_SHARE_TYPE_DISK;
 248         }
 249
 250         *out_share_flags = SMB2_SHAREFLAG_ALLOW_NAMESPACE_CACHING;
 251
 252         if (lp_msdfs_root(SNUM(tcon->compat_conn)) && lp_host_msdfs()) {
 253                 *out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
 254                 *out_capabilities = SMB2_SHARE_CAP_DFS;
 255         } else {
 256                 *out_capabilities = 0;
 257         }
 258
 259         switch(lp_csc_policy(SNUM(tcon->compat_conn))) {
 260         case CSC_POLICY_MANUAL:
 261                 break;
 262         case CSC_POLICY_DOCUMENTS:
 263                 *out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
 264                 break;
 265         case CSC_POLICY_PROGRAMS:
 266                 *out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
 267                 break;
 268         case CSC_POLICY_DISABLE:
 269                 *out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
 270                 break;
 271         default:
 272                 break;
 273         }
 274
 275         *out_maximal_access = tcon->compat_conn->share_access;
 276
 277         *out_tree_id = tcon->tid;
 278         return NT_STATUS_OK;
 279 }
 280
 281 NTSTATUS smbd_smb2_request_check_tcon(struct smbd_smb2_request *req)
 282 {
 283         const uint8_t *inhdr;
 284         int i = req->current_idx;
 285         uint32_t in_flags;
 286         uint32_t in_tid;
 287         void *p;
 288         struct smbd_smb2_tcon *tcon;
 289
 290         req->tcon = NULL;
 291
 292         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
 293
 294         in_flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 295         in_tid = IVAL(inhdr, SMB2_HDR_TID);
 296
 297         if (in_flags & SMB2_HDR_FLAG_CHAINED) {
 298                 in_tid = req->last_tid;
 299         }
 300
 301         req->last_tid = UINT32_MAX;
 302
 303         /* lookup an existing session */
 304         p = idr_find(req->session->tcons.idtree, in_tid);
 305         if (p == NULL) {
 306                 return NT_STATUS_NETWORK_NAME_DELETED;
 307         }
 308         tcon = talloc_get_type_abort(p, struct smbd_smb2_tcon);
 309
 310         if (!change_to_user(tcon->compat_conn,req->session->vuid)) {
 311                 return NT_STATUS_ACCESS_DENIED;
 312         }
 313
 314         /* should we pass FLAG_CASELESS_PATHNAMES here? */
 315         if (!set_current_service(tcon->compat_conn, 0, true)) {
 316                 return NT_STATUS_ACCESS_DENIED;
 317         }
 318
 319         req->tcon = tcon;
 320         req->last_tid = in_tid;
 321
 322         return NT_STATUS_OK;
 323 }
 324
 325 NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
 326 {
 327         NTSTATUS status;
 328         DATA_BLOB outbody;
 329
 330         status = smbd_smb2_request_verify_sizes(req, 0x04);
 331         if (!NT_STATUS_IS_OK(status)) {
 332                 return smbd_smb2_request_error(req, status);
 333         }
 334
 335         /*
 336          * TODO: cancel all outstanding requests on the tcon
 337          *       and delete all file handles.
 338          */
 339         TALLOC_FREE(req->tcon);
 340
 341         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 342         if (outbody.data == NULL) {
 343                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 344         }
 345
 346         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 347         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 348
 349         return smbd_smb2_request_done(req, outbody, NULL);
 350 }