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
  35 struct sesssetup_context {
  36         struct auth_context *auth_context;
  37         struct smbsrv_request *req;
  38 };
  39
  40 /*
  41   setup the OS, Lanman and domain portions of a session setup reply
  42 */
  43 static void sesssetup_common_strings(struct smbsrv_request *req,
  44                                      char **os, char **lanman, char **domain)
  45 {
  46         (*os) = talloc_asprintf(req, "Unix");
  47         (*lanman) = talloc_asprintf(req, "Samba %s", SAMBA_VERSION_STRING);
  48         (*domain) = talloc_asprintf(req, "%s",
  49                                     lp_workgroup(req->smb_conn->lp_ctx));
  50 }
  51
  52 static void smbsrv_sesssetup_backend_send(struct smbsrv_request *req,
  53                                           union smb_sesssetup *sess,
  54                                           NTSTATUS status)
  55 {
  56         if (NT_STATUS_IS_OK(status)) {
  57                 req->smb_conn->negotiate.done_sesssetup = true;
  58                 /* we need to keep the session long term */
  59                 req->session = talloc_steal(req->smb_conn, req->session);
  60         }
  61         smbsrv_reply_sesssetup_send(req, sess, status);
  62 }
  63
  64 static void sesssetup_old_send(struct tevent_req *subreq)
  65 {
  66         struct sesssetup_context *state = tevent_req_callback_data(subreq, struct sesssetup_context);
  67         struct smbsrv_request *req = state->req;
  68
  69         union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
  70         struct auth_serversupplied_info *server_info = NULL;
  71         struct auth_session_info *session_info;
  72         struct smbsrv_session *smb_sess;
  73         NTSTATUS status;
  74         uint32_t flags;
  75
  76         status = auth_check_password_recv(subreq, req, &server_info);
  77         TALLOC_FREE(subreq);
  78         if (!NT_STATUS_IS_OK(status)) goto failed;
  79
  80         flags = AUTH_SESSION_INFO_DEFAULT_GROUPS;
  81         if (server_info->authenticated) {
  82                 flags |= AUTH_SESSION_INFO_AUTHENTICATED;
  83         }
  84         /* This references server_info into session_info */
  85         status = req->smb_conn->negotiate.auth_context->generate_session_info(req,
  86                                                                               req->smb_conn->negotiate.auth_context,
  87                                                                               server_info, flags, &session_info);
  88         if (!NT_STATUS_IS_OK(status)) goto failed;
  89
  90         /* allocate a new session */
  91         smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
  92         if (!smb_sess) {
  93                 status = NT_STATUS_INSUFFICIENT_RESOURCES;
  94                 goto failed;
  95         }
  96
  97         /* Ensure this is marked as a 'real' vuid, not one
  98          * simply valid for the session setup leg */
  99         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 100         if (!NT_STATUS_IS_OK(status)) goto failed;
 101
 102         /* To correctly process any AndX packet (like a tree connect)
 103          * we need to fill in the session on the request here */
 104         req->session = smb_sess;
 105         sess->old.out.vuid = smb_sess->vuid;
 106
 107 failed:
 108         status = auth_nt_status_squash(status);
 109         smbsrv_sesssetup_backend_send(req, sess, status);
 110 }
 111
 112 /*
 113   handler for old style session setup
 114 */
 115 static void sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
 116 {
 117         struct auth_usersupplied_info *user_info = NULL;
 118         struct tsocket_address *remote_address;
 119         const char *remote_machine = NULL;
 120         struct tevent_req *subreq;
 121         struct sesssetup_context *state;
 122
 123         sess->old.out.vuid = 0;
 124         sess->old.out.action = 0;
 125
 126         sesssetup_common_strings(req,
 127                                  &sess->old.out.os,
 128                                  &sess->old.out.lanman,
 129                                  &sess->old.out.domain);
 130
 131         if (!req->smb_conn->negotiate.done_sesssetup) {
 132                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
 133         }
 134
 135         if (req->smb_conn->negotiate.calling_name) {
 136                 remote_machine = req->smb_conn->negotiate.calling_name->name;
 137         }
 138
 139         remote_address = socket_get_remote_addr(req->smb_conn->connection->socket, req);
 140         if (!remote_address) goto nomem;
 141
 142         if (!remote_machine) {
 143                 remote_machine = tsocket_address_inet_addr_string(remote_address, req);
 144                 if (!remote_machine) goto nomem;
 145         }
 146
 147         user_info = talloc(req, struct auth_usersupplied_info);
 148         if (!user_info) goto nomem;
 149
 150         user_info->mapped_state = false;
 151         user_info->logon_parameters = 0;
 152         user_info->flags = 0;
 153         user_info->client.account_name = sess->old.in.user;
 154         user_info->client.domain_name = sess->old.in.domain;
 155         user_info->workstation_name = remote_machine;
 156         user_info->remote_host = talloc_steal(user_info, remote_address);
 157
 158         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 159         user_info->password.response.lanman = sess->old.in.password;
 160         user_info->password.response.lanman.data = talloc_steal(user_info, sess->old.in.password.data);
 161         user_info->password.response.nt = data_blob(NULL, 0);
 162
 163         state = talloc(req, struct sesssetup_context);
 164         if (!state) goto nomem;
 165
 166         if (req->smb_conn->negotiate.auth_context) {
 167                 state->auth_context = req->smb_conn->negotiate.auth_context;
 168         } else {
 169                 /* TODO: should we use just "anonymous" here? */
 170                 NTSTATUS status = auth_context_create(state,
 171                                                       req->smb_conn->connection->event.ctx,
 172                                                       req->smb_conn->connection->msg_ctx,
 173                                                       req->smb_conn->lp_ctx,
 174                                                       &state->auth_context);
 175                 if (!NT_STATUS_IS_OK(status)) {
 176                         smbsrv_sesssetup_backend_send(req, sess, status);
 177                         return;
 178                 }
 179         }
 180
 181         state->req = req;
 182
 183         subreq = auth_check_password_send(state,
 184                                           req->smb_conn->connection->event.ctx,
 185                                           req->smb_conn->negotiate.auth_context,
 186                                           user_info);
 187         if (!subreq) goto nomem;
 188         tevent_req_set_callback(subreq, sesssetup_old_send, state);
 189         return;
 190
 191 nomem:
 192         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_NO_MEMORY);
 193 }
 194
 195 static void sesssetup_nt1_send(struct tevent_req *subreq)
 196 {
 197         struct sesssetup_context *state = tevent_req_callback_data(subreq, struct sesssetup_context);
 198         struct smbsrv_request *req = state->req;
 199         union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
 200         struct auth_serversupplied_info *server_info = NULL;
 201         struct auth_session_info *session_info;
 202         struct smbsrv_session *smb_sess;
 203
 204         uint32_t flags;
 205         NTSTATUS status;
 206
 207         status = auth_check_password_recv(subreq, req, &server_info);
 208         TALLOC_FREE(subreq);
 209         if (!NT_STATUS_IS_OK(status)) goto failed;
 210
 211         flags = AUTH_SESSION_INFO_DEFAULT_GROUPS;
 212         if (server_info->authenticated) {
 213                 flags |= AUTH_SESSION_INFO_AUTHENTICATED;
 214         }
 215
 216         /* This references server_info into session_info */
 217         status = state->auth_context->generate_session_info(req,
 218                                                             state->auth_context,
 219                                                             server_info,
 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(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         TALLOC_FREE(subreq);
 375         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 376                 goto done;
 377         } else if (!NT_STATUS_IS_OK(status)) {
 378                 goto failed;
 379         }
 380
 381         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
 382         if (!NT_STATUS_IS_OK(status)) goto failed;
 383
 384         skey_status = gensec_session_key(smb_sess->gensec_ctx, &session_key);
 385         if (NT_STATUS_IS_OK(skey_status)) {
 386                 smbsrv_setup_signing(req->smb_conn, &session_key, NULL);
 387         }
 388
 389         /* Ensure this is marked as a 'real' vuid, not one
 390          * simply valid for the session setup leg */
 391         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 392         if (!NT_STATUS_IS_OK(status)) goto failed;
 393
 394         req->session = smb_sess;
 395
 396 done:
 397         sess->spnego.out.vuid = smb_sess->vuid;
 398 failed:
 399         status = auth_nt_status_squash(status);
 400         smbsrv_sesssetup_backend_send(req, sess, status);
 401         if (!NT_STATUS_IS_OK(status) &&
 402             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 403                 talloc_free(smb_sess);
 404         }
 405 }
 406
 407 /*
 408   handler for SPNEGO style session setup
 409 */
 410 static void sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
 411 {
 412         NTSTATUS status;
 413         struct smbsrv_session *smb_sess = NULL;
 414         struct sesssetup_spnego_state *s = NULL;
 415         uint16_t vuid;
 416         struct tevent_req *subreq;
 417
 418         sess->spnego.out.vuid = 0;
 419         sess->spnego.out.action = 0;
 420
 421         sesssetup_common_strings(req,
 422                                  &sess->spnego.out.os,
 423                                  &sess->spnego.out.lanman,
 424                                  &sess->spnego.out.workgroup);
 425
 426         if (!req->smb_conn->negotiate.done_sesssetup) {
 427                 req->smb_conn->negotiate.max_send = sess->spnego.in.bufsize;
 428                 req->smb_conn->negotiate.client_caps = sess->spnego.in.capabilities;
 429         }
 430
 431         vuid = SVAL(req->in.hdr,HDR_UID);
 432
 433         /* lookup an existing session */
 434         smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
 435         if (!smb_sess) {
 436                 struct gensec_security *gensec_ctx;
 437
 438                 status = samba_server_gensec_start(req,
 439                                                    req->smb_conn->connection->event.ctx,
 440                                                    req->smb_conn->connection->msg_ctx,
 441                                                    req->smb_conn->lp_ctx,
 442                                                    req->smb_conn->negotiate.server_credentials,
 443                                                    "cifs",
 444                                                    &gensec_ctx);
 445                 if (!NT_STATUS_IS_OK(status)) {
 446                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 447                         goto failed;
 448                 }
 449
 450                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 451
 452                 status = gensec_start_mech_by_oid(gensec_ctx, req->smb_conn->negotiate.oid);
 453                 if (!NT_STATUS_IS_OK(status)) {
 454                         DEBUG(1, ("Failed to start GENSEC %s server code: %s\n",
 455                                   gensec_get_name_by_oid(gensec_ctx, req->smb_conn->negotiate.oid), nt_errstr(status)));
 456                         goto failed;
 457                 }
 458
 459                 /* allocate a new session */
 460                 smb_sess = smbsrv_session_new(req->smb_conn, req->smb_conn, gensec_ctx);
 461                 if (!smb_sess) {
 462                         status = NT_STATUS_INSUFFICIENT_RESOURCES;
 463                         goto failed;
 464                 }
 465         }
 466
 467         if (!smb_sess) {
 468                 status = NT_STATUS_ACCESS_DENIED;
 469                 goto failed;
 470         }
 471
 472         if (!smb_sess->gensec_ctx) {
 473                 status = NT_STATUS_INTERNAL_ERROR;
 474                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
 475                 goto failed;
 476         }
 477
 478         s = talloc(req, struct sesssetup_spnego_state);
 479         if (!s) goto nomem;
 480         s->req          = req;
 481         s->sess         = sess;
 482         s->smb_sess     = smb_sess;
 483
 484         subreq = gensec_update_send(s,
 485                                     req->smb_conn->connection->event.ctx,
 486                                     smb_sess->gensec_ctx,
 487                                     sess->spnego.in.secblob);
 488         if (!subreq) {
 489                 goto nomem;
 490         }
 491         tevent_req_set_callback(subreq, sesssetup_spnego_send, s);
 492
 493         return;
 494
 495 nomem:
 496         status = NT_STATUS_NO_MEMORY;
 497 failed:
 498         talloc_free(smb_sess);
 499         status = auth_nt_status_squash(status);
 500         smbsrv_sesssetup_backend_send(req, sess, status);
 501 }
 502
 503 /*
 504   backend for sessionsetup call - this takes all 3 variants of the call
 505 */
 506 void smbsrv_sesssetup_backend(struct smbsrv_request *req,
 507                               union smb_sesssetup *sess)
 508 {
 509         switch (sess->old.level) {
 510                 case RAW_SESSSETUP_OLD:
 511                         sesssetup_old(req, sess);
 512                         return;
 513
 514                 case RAW_SESSSETUP_NT1:
 515                         sesssetup_nt1(req, sess);
 516                         return;
 517
 518                 case RAW_SESSSETUP_SPNEGO:
 519                         sesssetup_spnego(req, sess);
 520                         return;
 521
 522                 case RAW_SESSSETUP_SMB2:
 523                         break;
 524         }
 525
 526         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_INVALID_LEVEL);
 527 }