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 #include "lib/param/loadparm.h"
  28
  29 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
  30                                        const char *in_path,
  31                                        uint8_t *out_share_type,
  32                                        uint32_t *out_share_flags,
  33                                        uint32_t *out_capabilities,
  34                                        uint32_t *out_maximal_access,
  35                                        uint32_t *out_tree_id);
  36
  37 NTSTATUS smbd_smb2_request_process_tcon(struct smbd_smb2_request *req)
  38 {
  39         const uint8_t *inbody;
  40         int i = req->current_idx;
  41         uint8_t *outhdr;
  42         DATA_BLOB outbody;
  43         uint16_t in_path_offset;
  44         uint16_t in_path_length;
  45         DATA_BLOB in_path_buffer;
  46         char *in_path_string;
  47         size_t in_path_string_size;
  48         uint8_t out_share_type = 0;
  49         uint32_t out_share_flags = 0;
  50         uint32_t out_capabilities = 0;
  51         uint32_t out_maximal_access = 0;
  52         uint32_t out_tree_id = 0;
  53         NTSTATUS status;
  54         bool ok;
  55
  56         status = smbd_smb2_request_verify_sizes(req, 0x09);
  57         if (!NT_STATUS_IS_OK(status)) {
  58                 return smbd_smb2_request_error(req, status);
  59         }
  60         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  61
  62         in_path_offset = SVAL(inbody, 0x04);
  63         in_path_length = SVAL(inbody, 0x06);
  64
  65         if (in_path_offset != (SMB2_HDR_BODY + req->in.vector[i+1].iov_len)) {
  66                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  67         }
  68
  69         if (in_path_length > req->in.vector[i+2].iov_len) {
  70                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  71         }
  72
  73         in_path_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  74         in_path_buffer.length = in_path_length;
  75
  76         ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
  77                                    in_path_buffer.data,
  78                                    in_path_buffer.length,
  79                                    &in_path_string,
  80                                    &in_path_string_size);
  81         if (!ok) {
  82                 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
  83         }
  84
  85         if (in_path_buffer.length == 0) {
  86                 in_path_string_size = 0;
  87         }
  88
  89         if (strlen(in_path_string) != in_path_string_size) {
  90                 return smbd_smb2_request_error(req, NT_STATUS_BAD_NETWORK_NAME);
  91         }
  92
  93         status = smbd_smb2_tree_connect(req, in_path_string,
  94                                         &out_share_type,
  95                                         &out_share_flags,
  96                                         &out_capabilities,
  97                                         &out_maximal_access,
  98                                         &out_tree_id);
  99         if (!NT_STATUS_IS_OK(status)) {
 100                 return smbd_smb2_request_error(req, status);
 101         }
 102
 103         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 104
 105         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 106         if (outbody.data == NULL) {
 107                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 108         }
 109
 110         SIVAL(outhdr, SMB2_HDR_TID, out_tree_id);
 111
 112         SSVAL(outbody.data, 0x00, 0x10);        /* struct size */
 113         SCVAL(outbody.data, 0x02,
 114               out_share_type);                  /* share type */
 115         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 116         SIVAL(outbody.data, 0x04,
 117               out_share_flags);                 /* share flags */
 118         SIVAL(outbody.data, 0x08,
 119               out_capabilities);                /* capabilities */
 120         SIVAL(outbody.data, 0x0C,
 121               out_maximal_access);              /* maximal access */
 122
 123         return smbd_smb2_request_done(req, outbody, NULL);
 124 }
 125
 126 static int smbd_smb2_tcon_destructor(struct smbd_smb2_tcon *tcon)
 127 {
 128         if (tcon->session == NULL) {
 129                 return 0;
 130         }
 131
 132         idr_remove(tcon->session->tcons.idtree, tcon->tid);
 133         DLIST_REMOVE(tcon->session->tcons.list, tcon);
 134         SMB_ASSERT(tcon->session->sconn->num_tcons_open > 0);
 135         tcon->session->sconn->num_tcons_open--;
 136
 137         if (tcon->compat_conn) {
 138                 set_current_service(tcon->compat_conn, 0, true);
 139                 close_cnum(tcon->compat_conn, tcon->session->vuid);
 140         }
 141
 142         tcon->compat_conn = NULL;
 143         tcon->tid = 0;
 144         tcon->session = NULL;
 145
 146         return 0;
 147 }
 148
 149 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
 150                                        const char *in_path,
 151                                        uint8_t *out_share_type,
 152                                        uint32_t *out_share_flags,
 153                                        uint32_t *out_capabilities,
 154                                        uint32_t *out_maximal_access,
 155                                        uint32_t *out_tree_id)
 156 {
 157         const char *share = in_path;
 158         char *service = NULL;
 159         int snum = -1;
 160         struct smbd_smb2_tcon *tcon;
 161         connection_struct *compat_conn = NULL;
 162         user_struct *compat_vuser = req->session->compat_vuser;
 163         int id;
 164         NTSTATUS status;
 165
 166         if (strncmp(share, "\\\\", 2) == 0) {
 167                 const char *p = strchr(share+2, '\\');
 168                 if (p) {
 169                         share = p + 1;
 170                 }
 171         }
 172
 173         DEBUG(10,("smbd_smb2_tree_connect: path[%s] share[%s]\n",
 174                   in_path, share));
 175
 176         service = talloc_strdup(talloc_tos(), share);
 177         if(!service) {
 178                 return NT_STATUS_NO_MEMORY;
 179         }
 180
 181         strlower_m(service);
 182
 183         /* TODO: do more things... */
 184         if (strequal(service,HOMES_NAME)) {
 185                 if (compat_vuser->homes_snum == -1) {
 186                         DEBUG(2, ("[homes] share not available for "
 187                                 "user %s because it was not found "
 188                                 "or created at session setup "
 189                                 "time\n",
 190                                 compat_vuser->session_info->unix_info->unix_name));
 191                         return NT_STATUS_BAD_NETWORK_NAME;
 192                 }
 193                 snum = compat_vuser->homes_snum;
 194         } else if ((compat_vuser->homes_snum != -1)
 195                    && strequal(service,
 196                         lp_servicename(compat_vuser->homes_snum))) {
 197                 snum = compat_vuser->homes_snum;
 198         } else {
 199                 snum = find_service(talloc_tos(), service, &service);
 200                 if (!service) {
 201                         return NT_STATUS_NO_MEMORY;
 202                 }
 203         }
 204
 205         if (snum < 0) {
 206                 DEBUG(3,("smbd_smb2_tree_connect: couldn't find service %s\n",
 207                          service));
 208                 return NT_STATUS_BAD_NETWORK_NAME;
 209         }
 210
 211         /* create a new tcon as child of the session */
 212         tcon = talloc_zero(req->session, struct smbd_smb2_tcon);
 213         if (tcon == NULL) {
 214                 return NT_STATUS_NO_MEMORY;
 215         }
 216         id = idr_get_new_random(req->session->tcons.idtree,
 217                                 tcon,
 218                                 req->session->tcons.limit);
 219         if (id == -1) {
 220                 TALLOC_FREE(tcon);
 221                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 222         }
 223         tcon->tid = id;
 224         tcon->snum = snum;
 225
 226         DLIST_ADD_END(req->session->tcons.list, tcon,
 227                       struct smbd_smb2_tcon *);
 228         tcon->session = req->session;
 229         tcon->session->sconn->num_tcons_open++;
 230         talloc_set_destructor(tcon, smbd_smb2_tcon_destructor);
 231
 232         compat_conn = make_connection_smb2(req->sconn,
 233                                         tcon,
 234                                         req->session->compat_vuser,
 235                                         "???",
 236                                         &status);
 237         if (compat_conn == NULL) {
 238                 TALLOC_FREE(tcon);
 239                 return status;
 240         }
 241         tcon->compat_conn = talloc_move(tcon, &compat_conn);
 242
 243         if (IS_PRINT(tcon->compat_conn)) {
 244                 *out_share_type = SMB2_SHARE_TYPE_PRINT;
 245         } else if (IS_IPC(tcon->compat_conn)) {
 246                 *out_share_type = SMB2_SHARE_TYPE_PIPE;
 247         } else {
 248                 *out_share_type = SMB2_SHARE_TYPE_DISK;
 249         }
 250
 251         *out_share_flags = 0;
 252
 253         if (lp_msdfs_root(SNUM(tcon->compat_conn)) && lp_host_msdfs()) {
 254                 *out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
 255                 *out_capabilities = SMB2_SHARE_CAP_DFS;
 256         } else {
 257                 *out_capabilities = 0;
 258         }
 259
 260         switch(lp_csc_policy(SNUM(tcon->compat_conn))) {
 261         case CSC_POLICY_MANUAL:
 262                 break;
 263         case CSC_POLICY_DOCUMENTS:
 264                 *out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
 265                 break;
 266         case CSC_POLICY_PROGRAMS:
 267                 *out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
 268                 break;
 269         case CSC_POLICY_DISABLE:
 270                 *out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
 271                 break;
 272         default:
 273                 break;
 274         }
 275
 276         if (lp_hideunreadable(SNUM(tcon->compat_conn)) ||
 277             lp_hideunwriteable_files(SNUM(tcon->compat_conn))) {
 278                 *out_share_flags |= SMB2_SHAREFLAG_ACCESS_BASED_DIRECTORY_ENUM;
 279         }
 280
 281         *out_maximal_access = tcon->compat_conn->share_access;
 282
 283         *out_tree_id = tcon->tid;
 284         return NT_STATUS_OK;
 285 }
 286
 287 NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
 288 {
 289         NTSTATUS status;
 290         DATA_BLOB outbody;
 291
 292         status = smbd_smb2_request_verify_sizes(req, 0x04);
 293         if (!NT_STATUS_IS_OK(status)) {
 294                 return smbd_smb2_request_error(req, status);
 295         }
 296
 297         /*
 298          * TODO: cancel all outstanding requests on the tcon
 299          *       and delete all file handles.
 300          */
 301         TALLOC_FREE(req->tcon);
 302
 303         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 304         if (outbody.data == NULL) {
 305                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 306         }
 307
 308         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 309         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 310
 311         return smbd_smb2_request_done(req, outbody, NULL);
 312 }