source4/smb_server/smb/sesssetup.c

   1
   2 /*
   3    Unix SMB/CIFS implementation.
   4    handle SMBsessionsetup
   5    Copyright (C) Andrew Tridgell                      1998-2001
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
   7    Copyright (C) Jim McDonough                        2002
   8    Copyright (C) Luke Howard                          2003
   9    Copyright (C) Stefan Metzmacher                    2005
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include <tevent.h>
  27 #include "version.h"
  28 #include "auth/gensec/gensec.h"
  29 #include "auth/auth.h"
  30 #include "smb_server/smb_server.h"
  31 #include "smbd/service_stream.h"
  32 #include "param/param.h"
  33 #include "../lib/tsocket/tsocket.h"
  34 #include "lib/stream/packet.h"
  35
  36 struct sesssetup_context {
  37         struct auth_context *auth_context;
  38         struct smbsrv_request *req;
  39 };
  40
  41 /*
  42   setup the OS, Lanman and domain portions of a session setup reply
  43 */
  44 static void sesssetup_common_strings(struct smbsrv_request *req,
  45                                      char **os, char **lanman, char **domain)
  46 {
  47         (*os) = talloc_asprintf(req, "Unix");
  48         (*lanman) = talloc_asprintf(req, "Samba %s", SAMBA_VERSION_STRING);
  49         (*domain) = talloc_asprintf(req, "%s",
  50                                     lpcfg_workgroup(req->smb_conn->lp_ctx));
  51 }
  52
  53 static void smbsrv_sesssetup_backend_send(struct smbsrv_request *req,
  54                                           union smb_sesssetup *sess,
  55                                           NTSTATUS status)
  56 {
  57         if (NT_STATUS_IS_OK(status)) {
  58                 req->smb_conn->negotiate.done_sesssetup = true;
  59                 /* we need to keep the session long term */
  60                 req->session = talloc_steal(req->smb_conn, req->session);
  61         }
  62         smbsrv_reply_sesssetup_send(req, sess, status);
  63 }
  64
  65 static void sesssetup_old_send(struct tevent_req *subreq)
  66 {
  67         struct sesssetup_context *state = tevent_req_callback_data(subreq, struct sesssetup_context);
  68         struct smbsrv_request *req = state->req;
  69
  70         union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
  71         struct auth_user_info_dc *user_info_dc = NULL;
  72         struct auth_session_info *session_info;
  73         struct smbsrv_session *smb_sess;
  74         NTSTATUS status;
  75         uint32_t flags;
  76
  77         status = auth_check_password_recv(subreq, req, &user_info_dc);
  78         TALLOC_FREE(subreq);
  79         if (!NT_STATUS_IS_OK(status)) goto failed;
  80
  81         flags = AUTH_SESSION_INFO_DEFAULT_GROUPS;
  82         if (user_info_dc->info->authenticated) {
  83                 flags |= AUTH_SESSION_INFO_AUTHENTICATED;
  84         }
  85         /* This references user_info_dc into session_info */
  86         status = req->smb_conn->negotiate.auth_context->generate_session_info(req,
  87                                                                               req->smb_conn->negotiate.auth_context,
  88                                                                               user_info_dc, flags, &session_info);
  89         if (!NT_STATUS_IS_OK(status)) goto failed;
  90
  91         /* allocate a new session */
  92         smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
  93         if (!smb_sess) {
  94                 status = NT_STATUS_INSUFFICIENT_RESOURCES;
  95                 goto failed;
  96         }
  97
  98         /* Ensure this is marked as a 'real' vuid, not one
  99          * simply valid for the session setup leg */
 100         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 101         if (!NT_STATUS_IS_OK(status)) goto failed;
 102
 103         /* To correctly process any AndX packet (like a tree connect)
 104          * we need to fill in the session on the request here */
 105         req->session = smb_sess;
 106         sess->old.out.vuid = smb_sess->vuid;
 107
 108 failed:
 109         status = auth_nt_status_squash(status);
 110         smbsrv_sesssetup_backend_send(req, sess, status);
 111 }
 112
 113 /*
 114   handler for old style session setup
 115 */
 116 static void sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
 117 {
 118         struct auth_usersupplied_info *user_info = NULL;
 119         struct tsocket_address *remote_address;
 120         const char *remote_machine = NULL;
 121         struct tevent_req *subreq;
 122         struct sesssetup_context *state;
 123
 124         sess->old.out.vuid = 0;
 125         sess->old.out.action = 0;
 126
 127         sesssetup_common_strings(req,
 128                                  &sess->old.out.os,
 129                                  &sess->old.out.lanman,
 130                                  &sess->old.out.domain);
 131
 132         if (!req->smb_conn->negotiate.done_sesssetup) {
 133                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
 134         }
 135
 136         if (req->smb_conn->negotiate.calling_name) {
 137                 remote_machine = req->smb_conn->negotiate.calling_name->name;
 138         }
 139
 140         remote_address = socket_get_remote_addr(req->smb_conn->connection->socket, req);
 141         if (!remote_address) goto nomem;
 142
 143         if (!remote_machine) {
 144                 remote_machine = tsocket_address_inet_addr_string(remote_address, req);
 145                 if (!remote_machine) goto nomem;
 146         }
 147
 148         user_info = talloc_zero(req, struct auth_usersupplied_info);
 149         if (!user_info) goto nomem;
 150
 151         user_info->mapped_state = false;
 152         user_info->logon_parameters = 0;
 153         user_info->flags = 0;
 154         user_info->client.account_name = sess->old.in.user;
 155         user_info->client.domain_name = sess->old.in.domain;
 156         user_info->workstation_name = remote_machine;
 157         user_info->remote_host = talloc_steal(user_info, remote_address);
 158
 159         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 160         user_info->password.response.lanman = sess->old.in.password;
 161         user_info->password.response.lanman.data = talloc_steal(user_info, sess->old.in.password.data);
 162         user_info->password.response.nt = data_blob(NULL, 0);
 163
 164         state = talloc(req, struct sesssetup_context);
 165         if (!state) goto nomem;
 166
 167         if (req->smb_conn->negotiate.auth_context) {
 168                 state->auth_context = req->smb_conn->negotiate.auth_context;
 169         } else {
 170                 /* TODO: should we use just "anonymous" here? */
 171                 NTSTATUS status = auth_context_create(state,
 172                                                       req->smb_conn->connection->event.ctx,
 173                                                       req->smb_conn->connection->msg_ctx,
 174                                                       req->smb_conn->lp_ctx,
 175                                                       &state->auth_context);
 176                 if (!NT_STATUS_IS_OK(status)) {
 177                         smbsrv_sesssetup_backend_send(req, sess, status);
 178                         return;
 179                 }
 180         }
 181
 182         state->req = req;
 183
 184         subreq = auth_check_password_send(state,
 185                                           req->smb_conn->connection->event.ctx,
 186                                           req->smb_conn->negotiate.auth_context,
 187                                           user_info);
 188         if (!subreq) goto nomem;
 189         tevent_req_set_callback(subreq, sesssetup_old_send, state);
 190         return;
 191
 192 nomem:
 193         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_NO_MEMORY);
 194 }
 195
 196 static void sesssetup_nt1_send(struct tevent_req *subreq)
 197 {
 198         struct sesssetup_context *state = tevent_req_callback_data(subreq, struct sesssetup_context);
 199         struct smbsrv_request *req = state->req;
 200         union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
 201         struct auth_user_info_dc *user_info_dc = NULL;
 202         struct auth_session_info *session_info;
 203         struct smbsrv_session *smb_sess;
 204
 205         uint32_t flags;
 206         NTSTATUS status;
 207
 208         status = auth_check_password_recv(subreq, req, &user_info_dc);
 209         TALLOC_FREE(subreq);
 210         if (!NT_STATUS_IS_OK(status)) goto failed;
 211
 212         flags = AUTH_SESSION_INFO_DEFAULT_GROUPS;
 213         if (user_info_dc->info->authenticated) {
 214                 flags |= AUTH_SESSION_INFO_AUTHENTICATED;
 215         }
 216         /* This references user_info_dc into session_info */
 217         status = state->auth_context->generate_session_info(req,
 218                                                             state->auth_context,
 219                                                             user_info_dc,
 220                                                             flags,
 221                                                             &session_info);
 222         if (!NT_STATUS_IS_OK(status)) goto failed;
 223
 224         /* allocate a new session */
 225         smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
 226         if (!smb_sess) {
 227                 status = NT_STATUS_INSUFFICIENT_RESOURCES;
 228                 goto failed;
 229         }
 230
 231         /* Ensure this is marked as a 'real' vuid, not one
 232          * simply valid for the session setup leg */
 233         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 234         if (!NT_STATUS_IS_OK(status)) goto failed;
 235
 236         /* To correctly process any AndX packet (like a tree connect)
 237          * we need to fill in the session on the request here */
 238         req->session = smb_sess;
 239         sess->nt1.out.vuid = smb_sess->vuid;
 240
 241         if (!smbsrv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
 242                 /* Already signing, or disabled */
 243                 goto done;
 244         }
 245
 246 done:
 247         status = NT_STATUS_OK;
 248 failed:
 249         status = auth_nt_status_squash(status);
 250         smbsrv_sesssetup_backend_send(req, sess, status);
 251 }
 252
 253 /*
 254   handler for NT1 style session setup
 255 */
 256 static void sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
 257 {
 258         NTSTATUS status;
 259         struct auth_usersupplied_info *user_info = NULL;
 260         struct tsocket_address *remote_address;
 261         const char *remote_machine = NULL;
 262         struct tevent_req *subreq;
 263         struct sesssetup_context *state;
 264
 265         sess->nt1.out.vuid = 0;
 266         sess->nt1.out.action = 0;
 267
 268         sesssetup_common_strings(req,
 269                                  &sess->nt1.out.os,
 270                                  &sess->nt1.out.lanman,
 271                                  &sess->nt1.out.domain);
 272
 273         if (!req->smb_conn->negotiate.done_sesssetup) {
 274                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 275                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 276         }
 277
 278         state = talloc(req, struct sesssetup_context);
 279         if (!state) goto nomem;
 280
 281         state->req = req;
 282
 283         if (req->smb_conn->negotiate.oid) {
 284                 if (sess->nt1.in.user && *sess->nt1.in.user) {
 285                         /* We can't accept a normal login, because we
 286                          * don't have a challenge */
 287                         status = NT_STATUS_LOGON_FAILURE;
 288                         goto failed;
 289                 }
 290
 291                 /* TODO: should we use just "anonymous" here? */
 292                 status = auth_context_create(state,
 293                                              req->smb_conn->connection->event.ctx,
 294                                              req->smb_conn->connection->msg_ctx,
 295                                              req->smb_conn->lp_ctx,
 296                                              &state->auth_context);
 297                 if (!NT_STATUS_IS_OK(status)) goto failed;
 298         } else if (req->smb_conn->negotiate.auth_context) {
 299                 state->auth_context = req->smb_conn->negotiate.auth_context;
 300         } else {
 301                 /* TODO: should we use just "anonymous" here? */
 302                 status = auth_context_create(state,
 303                                              req->smb_conn->connection->event.ctx,
 304                                              req->smb_conn->connection->msg_ctx,
 305                                              req->smb_conn->lp_ctx,
 306                                              &state->auth_context);
 307                 if (!NT_STATUS_IS_OK(status)) goto failed;
 308         }
 309
 310         if (req->smb_conn->negotiate.calling_name) {
 311                 remote_machine = req->smb_conn->negotiate.calling_name->name;
 312         }
 313
 314         remote_address = socket_get_remote_addr(req->smb_conn->connection->socket, req);
 315         if (!remote_address) goto nomem;
 316
 317         if (!remote_machine) {
 318                 remote_machine = tsocket_address_inet_addr_string(remote_address, req);
 319                 if (!remote_machine) goto nomem;
 320         }
 321
 322         user_info = talloc_zero(req, struct auth_usersupplied_info);
 323         if (!user_info) goto nomem;
 324
 325         user_info->mapped_state = false;
 326         user_info->logon_parameters = 0;
 327         user_info->flags = 0;
 328         user_info->client.account_name = sess->nt1.in.user;
 329         user_info->client.domain_name = sess->nt1.in.domain;
 330         user_info->workstation_name = remote_machine;
 331         user_info->remote_host = talloc_steal(user_info, remote_address);
 332
 333         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 334         user_info->password.response.lanman = sess->nt1.in.password1;
 335         user_info->password.response.lanman.data = talloc_steal(user_info, sess->nt1.in.password1.data);
 336         user_info->password.response.nt = sess->nt1.in.password2;
 337         user_info->password.response.nt.data = talloc_steal(user_info, sess->nt1.in.password2.data);
 338
 339         subreq = auth_check_password_send(state,
 340                                           req->smb_conn->connection->event.ctx,
 341                                           state->auth_context,
 342                                           user_info);
 343         if (!subreq) goto nomem;
 344         tevent_req_set_callback(subreq, sesssetup_nt1_send, state);
 345
 346         return;
 347
 348 nomem:
 349         status = NT_STATUS_NO_MEMORY;
 350 failed:
 351         status = auth_nt_status_squash(status);
 352         smbsrv_sesssetup_backend_send(req, sess, status);
 353 }
 354
 355 struct sesssetup_spnego_state {
 356         struct smbsrv_request *req;
 357         union smb_sesssetup *sess;
 358         struct smbsrv_session *smb_sess;
 359 };
 360
 361 static void sesssetup_spnego_send(struct tevent_req *subreq)
 362 {
 363         struct sesssetup_spnego_state *s = tevent_req_callback_data(subreq,
 364                                            struct sesssetup_spnego_state);
 365         struct smbsrv_request *req = s->req;
 366         union smb_sesssetup *sess = s->sess;
 367         struct smbsrv_session *smb_sess = s->smb_sess;
 368         struct auth_session_info *session_info = NULL;
 369         NTSTATUS status;
 370         NTSTATUS skey_status;
 371         DATA_BLOB session_key;
 372
 373         status = gensec_update_recv(subreq, req, &sess->spnego.out.secblob);
 374         packet_recv_enable(req->smb_conn->packet);
 375         TALLOC_FREE(subreq);
 376         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 377                 goto done;
 378         } else if (!NT_STATUS_IS_OK(status)) {
 379                 goto failed;
 380         }
 381
 382         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
 383         if (!NT_STATUS_IS_OK(status)) goto failed;
 384
 385         skey_status = gensec_session_key(smb_sess->gensec_ctx, &session_key);
 386         if (NT_STATUS_IS_OK(skey_status)) {
 387                 smbsrv_setup_signing(req->smb_conn, &session_key, NULL);
 388         }
 389
 390         /* Ensure this is marked as a 'real' vuid, not one
 391          * simply valid for the session setup leg */
 392         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 393         if (!NT_STATUS_IS_OK(status)) goto failed;
 394
 395         req->session = smb_sess;
 396
 397 done:
 398         sess->spnego.out.vuid = smb_sess->vuid;
 399 failed:
 400         status = auth_nt_status_squash(status);
 401         smbsrv_sesssetup_backend_send(req, sess, status);
 402         if (!NT_STATUS_IS_OK(status) &&
 403             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 404                 talloc_free(smb_sess);
 405         }
 406 }
 407
 408 /*
 409   handler for SPNEGO style session setup
 410 */
 411 static void sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
 412 {
 413         NTSTATUS status;
 414         struct smbsrv_session *smb_sess = NULL;
 415         struct sesssetup_spnego_state *s = NULL;
 416         uint16_t vuid;
 417         struct tevent_req *subreq;
 418
 419         sess->spnego.out.vuid = 0;
 420         sess->spnego.out.action = 0;
 421
 422         sesssetup_common_strings(req,
 423                                  &sess->spnego.out.os,
 424                                  &sess->spnego.out.lanman,
 425                                  &sess->spnego.out.workgroup);
 426
 427         if (!req->smb_conn->negotiate.done_sesssetup) {
 428                 req->smb_conn->negotiate.max_send = sess->spnego.in.bufsize;
 429                 req->smb_conn->negotiate.client_caps = sess->spnego.in.capabilities;
 430         }
 431
 432         vuid = SVAL(req->in.hdr,HDR_UID);
 433
 434         /* lookup an existing session */
 435         smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
 436         if (!smb_sess) {
 437                 struct gensec_security *gensec_ctx;
 438
 439                 status = samba_server_gensec_start(req,
 440                                                    req->smb_conn->connection->event.ctx,
 441                                                    req->smb_conn->connection->msg_ctx,
 442                                                    req->smb_conn->lp_ctx,
 443                                                    req->smb_conn->negotiate.server_credentials,
 444                                                    "cifs",
 445                                                    &gensec_ctx);
 446                 if (!NT_STATUS_IS_OK(status)) {
 447                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 448                         goto failed;
 449                 }
 450
 451                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 452
 453                 status = gensec_start_mech_by_oid(gensec_ctx, req->smb_conn->negotiate.oid);
 454                 if (!NT_STATUS_IS_OK(status)) {
 455                         DEBUG(1, ("Failed to start GENSEC %s server code: %s\n",
 456                                   gensec_get_name_by_oid(gensec_ctx, req->smb_conn->negotiate.oid), nt_errstr(status)));
 457                         goto failed;
 458                 }
 459
 460                 /* allocate a new session */
 461                 smb_sess = smbsrv_session_new(req->smb_conn, req->smb_conn, gensec_ctx);
 462                 if (!smb_sess) {
 463                         status = NT_STATUS_INSUFFICIENT_RESOURCES;
 464                         goto failed;
 465                 }
 466         }
 467
 468         if (!smb_sess) {
 469                 status = NT_STATUS_ACCESS_DENIED;
 470                 goto failed;
 471         }
 472
 473         if (!smb_sess->gensec_ctx) {
 474                 status = NT_STATUS_INTERNAL_ERROR;
 475                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
 476                 goto failed;
 477         }
 478
 479         s = talloc(req, struct sesssetup_spnego_state);
 480         if (!s) goto nomem;
 481         s->req          = req;
 482         s->sess         = sess;
 483         s->smb_sess     = smb_sess;
 484
 485         subreq = gensec_update_send(s,
 486                                     req->smb_conn->connection->event.ctx,
 487                                     smb_sess->gensec_ctx,
 488                                     sess->spnego.in.secblob);
 489         if (!subreq) {
 490                 goto nomem;
 491         }
 492         /* disable receipt of more packets on this socket until we've
 493            finished with the session setup. This avoids a problem with
 494            crashes if we get EOF on the socket while processing a session
 495            setup */
 496         packet_recv_disable(req->smb_conn->packet);
 497         tevent_req_set_callback(subreq, sesssetup_spnego_send, s);
 498
 499         return;
 500
 501 nomem:
 502         status = NT_STATUS_NO_MEMORY;
 503 failed:
 504         talloc_free(smb_sess);
 505         status = auth_nt_status_squash(status);
 506         smbsrv_sesssetup_backend_send(req, sess, status);
 507 }
 508
 509 /*
 510   backend for sessionsetup call - this takes all 3 variants of the call
 511 */
 512 void smbsrv_sesssetup_backend(struct smbsrv_request *req,
 513                               union smb_sesssetup *sess)
 514 {
 515         switch (sess->old.level) {
 516                 case RAW_SESSSETUP_OLD:
 517                         sesssetup_old(req, sess);
 518                         return;
 519
 520                 case RAW_SESSSETUP_NT1:
 521                         sesssetup_nt1(req, sess);
 522                         return;
 523
 524                 case RAW_SESSSETUP_SPNEGO:
 525                         sesssetup_spnego(req, sess);
 526                         return;
 527
 528                 case RAW_SESSSETUP_SMB2:
 529                         break;
 530         }
 531
 532         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_INVALID_LEVEL);
 533 }