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                                          __location__);
 119 }
 120
 121 static int smbd_smb2_session_destructor(struct smbd_smb2_session *session)
 122 {
 123         if (session->sconn == NULL) {
 124                 return 0;
 125         }
 126
 127         /* first free all tcons */
 128         while (session->tcons.list) {
 129                 talloc_free(session->tcons.list);
 130         }
 131
 132         idr_remove(session->sconn->smb2.sessions.idtree, session->vuid);
 133         DLIST_REMOVE(session->sconn->smb2.sessions.list, session);
 134
 135         session->vuid = 0;
 136         session->status = NT_STATUS_USER_SESSION_DELETED;
 137         session->sconn = NULL;
 138
 139         return 0;
 140 }
 141
 142 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *req,
 143                                         uint64_t in_session_id,
 144                                         uint8_t in_security_mode,
 145                                         DATA_BLOB in_security_buffer,
 146                                         uint16_t *out_session_flags,
 147                                         DATA_BLOB *out_security_buffer,
 148                                         uint64_t *out_session_id)
 149 {
 150         struct smbd_smb2_session *session;
 151         NTSTATUS status;
 152
 153         *out_session_flags = 0;
 154         *out_session_id = 0;
 155
 156         if (in_session_id == 0) {
 157                 int id;
 158
 159                 /* create a new session */
 160                 session = talloc_zero(req->sconn, struct smbd_smb2_session);
 161                 if (session == NULL) {
 162                         return NT_STATUS_NO_MEMORY;
 163                 }
 164                 session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 165                 id = idr_get_new_random(req->sconn->smb2.sessions.idtree,
 166                                         session,
 167                                         req->sconn->smb2.sessions.limit);
 168                 if (id == -1) {
 169                         return NT_STATUS_INSUFFICIENT_RESOURCES;
 170                 }
 171                 session->vuid = id;
 172
 173                 session->tcons.idtree = idr_init(session);
 174                 if (session->tcons.idtree == NULL) {
 175                         return NT_STATUS_NO_MEMORY;
 176                 }
 177                 session->tcons.limit = 0x0000FFFE;
 178                 session->tcons.list = NULL;
 179
 180                 DLIST_ADD_END(req->sconn->smb2.sessions.list, session,
 181                               struct smbd_smb2_session *);
 182                 session->sconn = req->sconn;
 183                 talloc_set_destructor(session, smbd_smb2_session_destructor);
 184         } else {
 185                 void *p;
 186
 187                 /* lookup an existing session */
 188                 p = idr_find(req->sconn->smb2.sessions.idtree, in_session_id);
 189                 if (p == NULL) {
 190                         return NT_STATUS_USER_SESSION_DELETED;
 191                 }
 192                 session = talloc_get_type_abort(p, struct smbd_smb2_session);
 193         }
 194
 195         if (NT_STATUS_IS_OK(session->status)) {
 196                 return NT_STATUS_REQUEST_NOT_ACCEPTED;
 197         }
 198
 199         if (session->auth_ntlmssp_state == NULL) {
 200                 status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
 201                 if (!NT_STATUS_IS_OK(status)) {
 202                         TALLOC_FREE(session);
 203                         return status;
 204                 }
 205         }
 206
 207         if (in_security_buffer.data[0] == ASN1_APPLICATION(0)) {
 208                 DATA_BLOB secblob_in;
 209                 DATA_BLOB chal_out;
 210                 char *kerb_mech = NULL;
 211
 212                 status = parse_spnego_mechanisms(in_security_buffer,
 213                                 &secblob_in, &kerb_mech);
 214                 if (!NT_STATUS_IS_OK(status)) {
 215                         TALLOC_FREE(session);
 216                         return nt_status_squash(status);
 217                 }
 218
 219                 /* For now, just SPNEGO NTLMSSP - krb5 goes here later.. */
 220                 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 221                                              secblob_in,
 222                                              &chal_out);
 223
 224                 if (!NT_STATUS_IS_OK(status) &&
 225                                 !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 226                         auth_ntlmssp_end(&session->auth_ntlmssp_state);
 227                         TALLOC_FREE(session);
 228                         return nt_status_squash(status);
 229                 }
 230
 231                 *out_security_buffer = spnego_gen_auth_response(&chal_out,
 232                                 status, OID_NTLMSSP);
 233
 234                 *out_session_id = session->vuid;
 235                 return status;
 236         } else if (in_security_buffer.data[0] == ASN1_CONTEXT(1)) {
 237                 DATA_BLOB auth = data_blob_null;
 238                 DATA_BLOB auth_out = data_blob_null;
 239
 240                 /* its an auth packet */
 241                 if (!spnego_parse_auth(in_security_buffer, &auth)) {
 242                         TALLOC_FREE(session);
 243                         return NT_STATUS_LOGON_FAILURE;
 244                 }
 245                 /* For now, just SPNEGO NTLMSSP - krb5 goes here later.. */
 246                 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 247                                              auth,
 248                                              &auth_out);
 249                 if (!NT_STATUS_IS_OK(status)) {
 250                         auth_ntlmssp_end(&session->auth_ntlmssp_state);
 251                         TALLOC_FREE(session);
 252                         return nt_status_squash(status);
 253                 }
 254
 255                 *out_security_buffer = spnego_gen_auth_response(&auth_out,
 256                                 status, NULL);
 257
 258                 *out_session_id = session->vuid;
 259         } else if (strncmp((char *)(in_security_buffer.data), "NTLMSSP", 7) == 0) {
 260
 261                 /* RAW NTLMSSP */
 262                 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 263                                              in_security_buffer,
 264                                              out_security_buffer);
 265
 266                 if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 267                         *out_session_id = session->vuid;
 268                         return status;
 269                 }
 270                 if (!NT_STATUS_IS_OK(status)) {
 271                         auth_ntlmssp_end(&session->auth_ntlmssp_state);
 272                         TALLOC_FREE(session);
 273                         return nt_status_squash(status);
 274                 }
 275                 *out_session_id = session->vuid;
 276         }
 277
 278         /* TODO: setup session key for signing */
 279
 280         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 281             lp_server_signing() == Required) {
 282                 session->do_signing = true;
 283         }
 284
 285         if (session->auth_ntlmssp_state->server_info->guest) {
 286                 /* we map anonymous to guest internally */
 287                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 288                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 289                 /* force no signing */
 290                 session->do_signing = false;
 291         }
 292
 293         session->server_info = session->auth_ntlmssp_state->server_info;
 294         data_blob_free(&session->server_info->user_session_key);
 295         session->server_info->user_session_key =
 296                         data_blob_talloc(
 297                         session->server_info,
 298                         session->auth_ntlmssp_state->ntlmssp_state->session_key.data,
 299                         session->auth_ntlmssp_state->ntlmssp_state->session_key.length);
 300         if (session->auth_ntlmssp_state->ntlmssp_state->session_key.length > 0) {
 301                 if (session->server_info->user_session_key.data == NULL) {
 302                         TALLOC_FREE(session);
 303                         return NT_STATUS_NO_MEMORY;
 304                 }
 305         }
 306         session->session_key = session->server_info->user_session_key;
 307
 308         session->compat_vuser = talloc_zero(session, user_struct);
 309         if (session->compat_vuser == NULL) {
 310                 TALLOC_FREE(session);
 311                 return NT_STATUS_NO_MEMORY;
 312         }
 313         session->compat_vuser->auth_ntlmssp_state = session->auth_ntlmssp_state;
 314         session->compat_vuser->homes_snum = -1;
 315         session->compat_vuser->server_info = session->server_info;
 316         session->compat_vuser->session_keystr = NULL;
 317         session->compat_vuser->vuid = session->vuid;
 318         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 319
 320         session->status = NT_STATUS_OK;
 321
 322         /*
 323          * we attach the session to the request
 324          * so that the response can be signed
 325          */
 326         req->session = session;
 327         if (session->do_signing) {
 328                 req->do_signing = true;
 329         }
 330
 331         *out_session_id = session->vuid;
 332         return status;
 333 }
 334
 335 NTSTATUS smbd_smb2_request_check_session(struct smbd_smb2_request *req)
 336 {
 337         const uint8_t *inhdr;
 338         int i = req->current_idx;
 339         uint64_t in_session_id;
 340         void *p;
 341         struct smbd_smb2_session *session;
 342
 343         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
 344
 345         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
 346
 347         /* lookup an existing session */
 348         p = idr_find(req->sconn->smb2.sessions.idtree, in_session_id);
 349         if (p == NULL) {
 350                 return NT_STATUS_USER_SESSION_DELETED;
 351         }
 352         session = talloc_get_type_abort(p, struct smbd_smb2_session);
 353
 354         if (!NT_STATUS_IS_OK(session->status)) {
 355                 return NT_STATUS_ACCESS_DENIED;
 356         }
 357
 358         set_current_user_info(session->server_info->sanitized_username,
 359                               session->server_info->unix_name,
 360                               pdb_get_domain(session->server_info->sam_account));
 361
 362         req->session = session;
 363         return NT_STATUS_OK;
 364 }
 365
 366 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 367 {
 368         const uint8_t *inbody;
 369         int i = req->current_idx;
 370         DATA_BLOB outbody;
 371         size_t expected_body_size = 0x04;
 372         size_t body_size;
 373
 374         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
 375                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 376         }
 377
 378         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 379
 380         body_size = SVAL(inbody, 0x00);
 381         if (body_size != expected_body_size) {
 382                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 383         }
 384
 385         /*
 386          * TODO: cancel all outstanding requests on the session
 387          *       and delete all tree connections.
 388          */
 389         smbd_smb2_session_destructor(req->session);
 390         /*
 391          * we may need to sign the response, so we need to keep
 392          * the session until the response is sent to the wire.
 393          */
 394         talloc_steal(req, req->session);
 395
 396         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 397         if (outbody.data == NULL) {
 398                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 399         }
 400
 401         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 402         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 403
 404         return smbd_smb2_request_done(req, outbody, NULL);
 405 }