source3/smbd/smb2_sesssetup.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 "../source4/libcli/smb2/smb2_constants.h"
  24
  25 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *req,
  26                                         uint64_t in_session_id,
  27                                         uint8_t in_security_mode,
  28                                         DATA_BLOB in_security_buffer,
  29                                         uint16_t *out_session_flags,
  30                                         DATA_BLOB *out_security_buffer,
  31                                         uint64_t *out_session_id);
  32
  33 NTSTATUS smbd_smb2_request_process_sesssetup(struct smbd_smb2_request *req)
  34 {
  35         const uint8_t *inhdr;
  36         const uint8_t *inbody;
  37         int i = req->current_idx;
  38         uint8_t *outhdr;
  39         DATA_BLOB outbody;
  40         DATA_BLOB outdyn;
  41         size_t expected_body_size = 0x19;
  42         size_t body_size;
  43         uint64_t in_session_id;
  44         uint8_t in_security_mode;
  45         uint16_t in_security_offset;
  46         uint16_t in_security_length;
  47         DATA_BLOB in_security_buffer;
  48         uint16_t out_session_flags;
  49         uint64_t out_session_id;
  50         uint16_t out_security_offset;
  51         DATA_BLOB out_security_buffer;
  52         NTSTATUS status;
  53
  54         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  55
  56         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  57                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  58         }
  59
  60         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  61
  62         body_size = SVAL(inbody, 0x00);
  63         if (body_size != expected_body_size) {
  64                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  65         }
  66
  67         in_security_offset = SVAL(inbody, 0x0C);
  68         in_security_length = SVAL(inbody, 0x0E);
  69
  70         if (in_security_offset != (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
  71                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  72         }
  73
  74         if (in_security_length > req->in.vector[i+2].iov_len) {
  75                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  76         }
  77
  78         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
  79         in_security_mode = CVAL(inbody, 0x03);
  80         in_security_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
  81         in_security_buffer.length = in_security_length;
  82
  83         status = smbd_smb2_session_setup(req,
  84                                          in_session_id,
  85                                          in_security_mode,
  86                                          in_security_buffer,
  87                                          &out_session_flags,
  88                                          &out_security_buffer,
  89                                          &out_session_id);
  90         if (!NT_STATUS_IS_OK(status) &&
  91             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  92                 status = nt_status_squash(status);
  93                 return smbd_smb2_request_error(req, status);
  94         }
  95
  96         out_security_offset = SMB2_HDR_BODY + 0x08;
  97
  98         outhdr = (uint8_t *)req->out.vector[i].iov_base;
  99
 100         outbody = data_blob_talloc(req->out.vector, NULL, 0x08);
 101         if (outbody.data == NULL) {
 102                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 103         }
 104
 105         SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
 106
 107         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 108         SSVAL(outbody.data, 0x02,
 109               out_session_flags);               /* session flags */
 110         SSVAL(outbody.data, 0x04,
 111               out_security_offset);             /* security buffer offset */
 112         SSVAL(outbody.data, 0x06,
 113               out_security_buffer.length);      /* security buffer length */
 114
 115         outdyn = out_security_buffer;
 116
 117         return smbd_smb2_request_done_ex(req, status, outbody, &outdyn);
 118 }
 119
 120 static int smbd_smb2_session_destructor(struct smbd_smb2_session *session)
 121 {
 122         if (session->conn == NULL) {
 123                 return 0;
 124         }
 125
 126         /* first free all tcons */
 127         while (session->tcons.list) {
 128                 talloc_free(session->tcons.list);
 129         }
 130
 131         idr_remove(session->conn->smb2.sessions.idtree, session->vuid);
 132         DLIST_REMOVE(session->conn->smb2.sessions.list, session);
 133
 134         session->vuid = 0;
 135         session->status = NT_STATUS_USER_SESSION_DELETED;
 136         session->conn = NULL;
 137
 138         return 0;
 139 }
 140
 141 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *req,
 142                                         uint64_t in_session_id,
 143                                         uint8_t in_security_mode,
 144                                         DATA_BLOB in_security_buffer,
 145                                         uint16_t *out_session_flags,
 146                                         DATA_BLOB *out_security_buffer,
 147                                         uint64_t *out_session_id)
 148 {
 149         struct smbd_smb2_session *session;
 150         NTSTATUS status;
 151
 152         *out_session_flags = 0;
 153
 154         if (in_session_id == 0) {
 155                 int id;
 156
 157                 /* create a new session */
 158                 session = talloc_zero(req->conn, struct smbd_smb2_session);
 159                 if (session == NULL) {
 160                         return NT_STATUS_NO_MEMORY;
 161                 }
 162                 session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 163                 id = idr_get_new_random(req->conn->smb2.sessions.idtree,
 164                                         session,
 165                                         req->conn->smb2.sessions.limit);
 166                 if (id == -1) {
 167                         return NT_STATUS_INSUFFICIENT_RESOURCES;
 168                 }
 169                 session->vuid = id;
 170
 171                 session->tcons.idtree = idr_init(session);
 172                 if (session->tcons.idtree == NULL) {
 173                         return NT_STATUS_NO_MEMORY;
 174                 }
 175                 session->tcons.limit = 0x00FFFFFF;
 176                 session->tcons.list = NULL;
 177
 178                 DLIST_ADD_END(req->conn->smb2.sessions.list, session,
 179                               struct smbd_smb2_session *);
 180                 session->conn = req->conn;
 181                 talloc_set_destructor(session, smbd_smb2_session_destructor);
 182         } else {
 183                 void *p;
 184
 185                 /* lookup an existing session */
 186                 p = idr_find(req->conn->smb2.sessions.idtree, in_session_id);
 187                 if (p == NULL) {
 188                         return NT_STATUS_USER_SESSION_DELETED;
 189                 }
 190                 session = talloc_get_type_abort(p, struct smbd_smb2_session);
 191         }
 192
 193         if (NT_STATUS_IS_OK(session->status)) {
 194                 return NT_STATUS_REQUEST_NOT_ACCEPTED;
 195         }
 196
 197         if (session->auth_ntlmssp_state == NULL) {
 198                 status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
 199                 if (!NT_STATUS_IS_OK(status)) {
 200                         TALLOC_FREE(session);
 201                         return status;
 202                 }
 203         }
 204
 205         status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 206                                      in_security_buffer,
 207                                      out_security_buffer);
 208         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 209                 *out_session_id = session->vuid;
 210                 return status;
 211         } else if (!NT_STATUS_IS_OK(status)) {
 212                 TALLOC_FREE(session);
 213                 return status;
 214         }
 215
 216         /* TODO: setup session key for signing */
 217
 218         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 219             lp_server_signing() == Required) {
 220                 session->do_signing = true;
 221         }
 222
 223         if (session->auth_ntlmssp_state->server_info->guest) {
 224                 /* we map anonymous to guest internally */
 225                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 226                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 227                 /* force no signing */
 228                 session->do_signing = false;
 229         }
 230
 231         session->server_info = session->auth_ntlmssp_state->server_info;
 232         data_blob_free(&session->server_info->user_session_key);
 233         session->server_info->user_session_key =
 234                         data_blob_talloc(
 235                         session->server_info,
 236                         session->auth_ntlmssp_state->ntlmssp_state->session_key.data,
 237                         session->auth_ntlmssp_state->ntlmssp_state->session_key.length);
 238         if (session->auth_ntlmssp_state->ntlmssp_state->session_key.length > 0) {
 239                 if (session->server_info->user_session_key.data == NULL) {
 240                         TALLOC_FREE(session);
 241                         return NT_STATUS_NO_MEMORY;
 242                 }
 243         }
 244         session->session_key = session->server_info->user_session_key;
 245
 246         session->status = NT_STATUS_OK;
 247
 248         /*
 249          * we attach the session to the request
 250          * so that the response can be signed
 251          */
 252         req->session = session;
 253         if (session->do_signing) {
 254                 req->do_signing = true;
 255         }
 256
 257         *out_session_id = session->vuid;
 258         return status;
 259 }
 260
 261 NTSTATUS smbd_smb2_request_check_session(struct smbd_smb2_request *req)
 262 {
 263         const uint8_t *inhdr;
 264         int i = req->current_idx;
 265         uint64_t in_session_id;
 266         void *p;
 267         struct smbd_smb2_session *session;
 268
 269         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
 270
 271         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
 272
 273         /* lookup an existing session */
 274         p = idr_find(req->conn->smb2.sessions.idtree, in_session_id);
 275         if (p == NULL) {
 276                 return NT_STATUS_USER_SESSION_DELETED;
 277         }
 278         session = talloc_get_type_abort(p, struct smbd_smb2_session);
 279
 280         if (!NT_STATUS_IS_OK(session->status)) {
 281                 return NT_STATUS_ACCESS_DENIED;
 282         }
 283
 284         req->session = session;
 285         return NT_STATUS_OK;
 286 }
 287
 288 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 289 {
 290         const uint8_t *inbody;
 291         int i = req->current_idx;
 292         DATA_BLOB outbody;
 293         size_t expected_body_size = 0x04;
 294         size_t body_size;
 295
 296         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
 297                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 298         }
 299
 300         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 301
 302         body_size = SVAL(inbody, 0x00);
 303         if (body_size != expected_body_size) {
 304                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 305         }
 306
 307         /*
 308          * TODO: cancel all outstanding requests on the session
 309          *       and delete all tree connections.
 310          */
 311         smbd_smb2_session_destructor(req->session);
 312         /*
 313          * we may need to sign the response, so we need to keep
 314          * the session until the response is sent to the wire.
 315          */
 316         talloc_steal(req, req->session);
 317
 318         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 319         if (outbody.data == NULL) {
 320                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 321         }
 322
 323         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 324         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 325
 326         return smbd_smb2_request_done(req, outbody, NULL);
 327 }