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                 close_cnum(tcon->compat_conn, tcon->session->vuid);
 132         }
 133
 134         tcon->compat_conn = NULL;
 135         tcon->tid = 0;
 136         tcon->session = NULL;
 137
 138         return 0;
 139 }
 140
 141 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
 142                                        const char *in_path,
 143                                        uint8_t *out_share_type,
 144                                        uint32_t *out_share_flags,
 145                                        uint32_t *out_capabilities,
 146                                        uint32_t *out_maximal_access,
 147                                        uint32_t *out_tree_id)
 148 {
 149         const char *share = in_path;
 150         fstring service;
 151         int snum = -1;
 152         struct smbd_smb2_tcon *tcon;
 153         connection_struct *compat_conn = NULL;
 154         int id;
 155         NTSTATUS status;
 156
 157         if (strncmp(share, "\\\\", 2) == 0) {
 158                 const char *p = strchr(share+2, '\\');
 159                 if (p) {
 160                         share = p + 1;
 161                 }
 162         }
 163
 164         DEBUG(10,("smbd_smb2_tree_connect: path[%s] share[%s]\n",
 165                   in_path, share));
 166
 167         fstrcpy(service, share);
 168
 169         strlower_m(service);
 170
 171         snum = find_service(service);
 172         if (snum < 0) {
 173                 DEBUG(3,("smbd_smb2_tree_connect: couldn't find service %s\n",
 174                          service));
 175                 return NT_STATUS_BAD_NETWORK_NAME;
 176         }
 177
 178         /* TODO: do more things... */
 179
 180         /* create a new tcon as child of the session */
 181         tcon = talloc_zero(req->session, struct smbd_smb2_tcon);
 182         if (tcon == NULL) {
 183                 return NT_STATUS_NO_MEMORY;
 184         }
 185         id = idr_get_new_random(req->session->tcons.idtree,
 186                                 tcon,
 187                                 req->session->tcons.limit);
 188         if (id == -1) {
 189                 TALLOC_FREE(tcon);
 190                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 191         }
 192         tcon->tid = id;
 193         tcon->snum = snum;
 194
 195         DLIST_ADD_END(req->session->tcons.list, tcon,
 196                       struct smbd_smb2_tcon *);
 197         tcon->session = req->session;
 198         talloc_set_destructor(tcon, smbd_smb2_tcon_destructor);
 199
 200         compat_conn = make_connection_snum(req->sconn,
 201                                         snum, req->session->compat_vuser,
 202                                         data_blob_null, "???",
 203                                         &status);
 204         if (compat_conn == NULL) {
 205                 TALLOC_FREE(tcon);
 206                 return status;
 207         }
 208         tcon->compat_conn = talloc_move(tcon, &compat_conn);
 209         tcon->compat_conn->cnum = tcon->tid;
 210
 211         if (IS_PRINT(tcon->compat_conn)) {
 212                 *out_share_type = 0x03;
 213         } else if (IS_IPC(tcon->compat_conn)) {
 214                 *out_share_type = 0x02;
 215         } else {
 216                 *out_share_type = 0x01;
 217         }
 218         *out_share_flags = SMB2_SHAREFLAG_ALL;
 219         *out_capabilities = 0;
 220         *out_maximal_access = FILE_GENERIC_ALL;
 221
 222         *out_tree_id = tcon->tid;
 223         return NT_STATUS_OK;
 224 }
 225
 226 NTSTATUS smbd_smb2_request_check_tcon(struct smbd_smb2_request *req)
 227 {
 228         const uint8_t *inhdr;
 229         const uint8_t *outhdr;
 230         int i = req->current_idx;
 231         uint32_t in_tid;
 232         void *p;
 233         struct smbd_smb2_tcon *tcon;
 234         bool chained_fixup = false;
 235
 236         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
 237
 238         in_tid = IVAL(inhdr, SMB2_HDR_TID);
 239
 240         if (in_tid == (0xFFFFFFFF)) {
 241                 if (req->async) {
 242                         /*
 243                          * async request - fill in tid from
 244                          * already setup out.vector[].iov_base.
 245                          */
 246                         outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 247                         in_tid = IVAL(outhdr, SMB2_HDR_TID);
 248                 } else if (i > 2) {
 249                         /*
 250                          * Chained request - fill in tid from
 251                          * the previous request out.vector[].iov_base.
 252                          */
 253                         outhdr = (const uint8_t *)req->out.vector[i-3].iov_base;
 254                         in_tid = IVAL(outhdr, SMB2_HDR_TID);
 255                         chained_fixup = true;
 256                 }
 257         }
 258
 259         /* lookup an existing session */
 260         p = idr_find(req->session->tcons.idtree, in_tid);
 261         if (p == NULL) {
 262                 return NT_STATUS_NETWORK_NAME_DELETED;
 263         }
 264         tcon = talloc_get_type_abort(p, struct smbd_smb2_tcon);
 265
 266         if (!change_to_user(tcon->compat_conn,req->session->vuid)) {
 267                 return NT_STATUS_ACCESS_DENIED;
 268         }
 269
 270         /* should we pass FLAG_CASELESS_PATHNAMES here? */
 271         if (!set_current_service(tcon->compat_conn, 0, true)) {
 272                 return NT_STATUS_ACCESS_DENIED;
 273         }
 274
 275         req->tcon = tcon;
 276
 277         if (chained_fixup) {
 278                 /* Fix up our own outhdr. */
 279                 outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 280                 SIVAL(outhdr, SMB2_HDR_TID, in_tid);
 281         }
 282
 283         return NT_STATUS_OK;
 284 }
 285
 286 NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
 287 {
 288         const uint8_t *inbody;
 289         int i = req->current_idx;
 290         DATA_BLOB outbody;
 291         size_t expected_body_size = 0x04;
 292         size_t body_size;
 293
 294         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
 295                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 296         }
 297
 298         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 299
 300         body_size = SVAL(inbody, 0x00);
 301         if (body_size != expected_body_size) {
 302                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 303         }
 304
 305         /*
 306          * TODO: cancel all outstanding requests on the tcon
 307          *       and delete all file handles.
 308          */
 309         TALLOC_FREE(req->tcon);
 310
 311         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 312         if (outbody.data == NULL) {
 313                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 314         }
 315
 316         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 317         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 318
 319         return smbd_smb2_request_done(req, outbody, NULL);
 320 }