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
  75         status = auth_check_password_recv(subreq, req, &server_info);
  76         TALLOC_FREE(subreq);
  77         if (!NT_STATUS_IS_OK(status)) goto failed;
  78
  79         /* This references server_info into session_info */
  80         status = req->smb_conn->negotiate.auth_context->generate_session_info(req,
  81                                                                               req->smb_conn->negotiate.auth_context,
  82                                                                               server_info, &session_info);
  83         if (!NT_STATUS_IS_OK(status)) goto failed;
  84
  85         /* allocate a new session */
  86         smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
  87         if (!smb_sess) {
  88                 status = NT_STATUS_INSUFFICIENT_RESOURCES;
  89                 goto failed;
  90         }
  91
  92         /* Ensure this is marked as a 'real' vuid, not one
  93          * simply valid for the session setup leg */
  94         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
  95         if (!NT_STATUS_IS_OK(status)) goto failed;
  96
  97         /* To correctly process any AndX packet (like a tree connect)
  98          * we need to fill in the session on the request here */
  99         req->session = smb_sess;
 100         sess->old.out.vuid = smb_sess->vuid;
 101
 102 failed:
 103         status = auth_nt_status_squash(status);
 104         smbsrv_sesssetup_backend_send(req, sess, status);
 105 }
 106
 107 /*
 108   handler for old style session setup
 109 */
 110 static void sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
 111 {
 112         struct auth_usersupplied_info *user_info = NULL;
 113         struct tsocket_address *remote_address;
 114         const char *remote_machine = NULL;
 115         struct tevent_req *subreq;
 116         struct sesssetup_context *state;
 117
 118         sess->old.out.vuid = 0;
 119         sess->old.out.action = 0;
 120
 121         sesssetup_common_strings(req,
 122                                  &sess->old.out.os,
 123                                  &sess->old.out.lanman,
 124                                  &sess->old.out.domain);
 125
 126         if (!req->smb_conn->negotiate.done_sesssetup) {
 127                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
 128         }
 129
 130         if (req->smb_conn->negotiate.calling_name) {
 131                 remote_machine = req->smb_conn->negotiate.calling_name->name;
 132         }
 133
 134         remote_address = socket_get_remote_addr(req->smb_conn->connection->socket, req);
 135         if (!remote_address) goto nomem;
 136
 137         if (!remote_machine) {
 138                 remote_machine = tsocket_address_inet_addr_string(remote_address, req);
 139                 if (!remote_machine) goto nomem;
 140         }
 141
 142         user_info = talloc(req, struct auth_usersupplied_info);
 143         if (!user_info) goto nomem;
 144
 145         user_info->mapped_state = false;
 146         user_info->logon_parameters = 0;
 147         user_info->flags = 0;
 148         user_info->client.account_name = sess->old.in.user;
 149         user_info->client.domain_name = sess->old.in.domain;
 150         user_info->workstation_name = remote_machine;
 151         user_info->remote_host = talloc_steal(user_info, remote_address);
 152
 153         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 154         user_info->password.response.lanman = sess->old.in.password;
 155         user_info->password.response.lanman.data = talloc_steal(user_info, sess->old.in.password.data);
 156         user_info->password.response.nt = data_blob(NULL, 0);
 157
 158         state = talloc(req, struct sesssetup_context);
 159         if (!state) goto nomem;
 160
 161         if (req->smb_conn->negotiate.auth_context) {
 162                 state->auth_context = req->smb_conn->negotiate.auth_context;
 163         } else {
 164                 /* TODO: should we use just "anonymous" here? */
 165                 NTSTATUS status = auth_context_create(state,
 166                                                       req->smb_conn->connection->event.ctx,
 167                                                       req->smb_conn->connection->msg_ctx,
 168                                                       req->smb_conn->lp_ctx,
 169                                                       &state->auth_context);
 170                 if (!NT_STATUS_IS_OK(status)) {
 171                         smbsrv_sesssetup_backend_send(req, sess, status);
 172                         return;
 173                 }
 174         }
 175
 176         state->req = req;
 177
 178         subreq = auth_check_password_send(state,
 179                                           req->smb_conn->connection->event.ctx,
 180                                           req->smb_conn->negotiate.auth_context,
 181                                           user_info);
 182         if (!subreq) goto nomem;
 183         tevent_req_set_callback(subreq, sesssetup_old_send, state);
 184         return;
 185
 186 nomem:
 187         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_NO_MEMORY);
 188 }
 189
 190 static void sesssetup_nt1_send(struct tevent_req *subreq)
 191 {
 192         struct sesssetup_context *state = tevent_req_callback_data(subreq, struct sesssetup_context);
 193         struct smbsrv_request *req = state->req;
 194         union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
 195         struct auth_serversupplied_info *server_info = NULL;
 196         struct auth_session_info *session_info;
 197         struct smbsrv_session *smb_sess;
 198
 199         NTSTATUS status;
 200
 201         status = auth_check_password_recv(subreq, req, &server_info);
 202         TALLOC_FREE(subreq);
 203         if (!NT_STATUS_IS_OK(status)) goto failed;
 204
 205         /* This references server_info into session_info */
 206         status = state->auth_context->generate_session_info(req,
 207                                                             state->auth_context,
 208                                                             server_info,
 209                                                             &session_info);
 210         if (!NT_STATUS_IS_OK(status)) goto failed;
 211
 212         /* allocate a new session */
 213         smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
 214         if (!smb_sess) {
 215                 status = NT_STATUS_INSUFFICIENT_RESOURCES;
 216                 goto failed;
 217         }
 218
 219         /* Ensure this is marked as a 'real' vuid, not one
 220          * simply valid for the session setup leg */
 221         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 222         if (!NT_STATUS_IS_OK(status)) goto failed;
 223
 224         /* To correctly process any AndX packet (like a tree connect)
 225          * we need to fill in the session on the request here */
 226         req->session = smb_sess;
 227         sess->nt1.out.vuid = smb_sess->vuid;
 228
 229         if (!smbsrv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
 230                 /* Already signing, or disabled */
 231                 goto done;
 232         }
 233
 234 done:
 235         status = NT_STATUS_OK;
 236 failed:
 237         status = auth_nt_status_squash(status);
 238         smbsrv_sesssetup_backend_send(req, sess, status);
 239 }
 240
 241 /*
 242   handler for NT1 style session setup
 243 */
 244 static void sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
 245 {
 246         NTSTATUS status;
 247         struct auth_usersupplied_info *user_info = NULL;
 248         struct tsocket_address *remote_address;
 249         const char *remote_machine = NULL;
 250         struct tevent_req *subreq;
 251         struct sesssetup_context *state;
 252
 253         sess->nt1.out.vuid = 0;
 254         sess->nt1.out.action = 0;
 255
 256         sesssetup_common_strings(req,
 257                                  &sess->nt1.out.os,
 258                                  &sess->nt1.out.lanman,
 259                                  &sess->nt1.out.domain);
 260
 261         if (!req->smb_conn->negotiate.done_sesssetup) {
 262                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 263                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 264         }
 265
 266         state = talloc(req, struct sesssetup_context);
 267         if (!state) goto nomem;
 268
 269         state->req = req;
 270
 271         if (req->smb_conn->negotiate.oid) {
 272                 if (sess->nt1.in.user && *sess->nt1.in.user) {
 273                         /* We can't accept a normal login, because we
 274                          * don't have a challenge */
 275                         status = NT_STATUS_LOGON_FAILURE;
 276                         goto failed;
 277                 }
 278
 279                 /* TODO: should we use just "anonymous" here? */
 280                 status = auth_context_create(state,
 281                                              req->smb_conn->connection->event.ctx,
 282                                              req->smb_conn->connection->msg_ctx,
 283                                              req->smb_conn->lp_ctx,
 284                                              &state->auth_context);
 285                 if (!NT_STATUS_IS_OK(status)) goto failed;
 286         } else if (req->smb_conn->negotiate.auth_context) {
 287                 state->auth_context = req->smb_conn->negotiate.auth_context;
 288         } else {
 289                 /* TODO: should we use just "anonymous" here? */
 290                 status = auth_context_create(state,
 291                                              req->smb_conn->connection->event.ctx,
 292                                              req->smb_conn->connection->msg_ctx,
 293                                              req->smb_conn->lp_ctx,
 294                                              &state->auth_context);
 295                 if (!NT_STATUS_IS_OK(status)) goto failed;
 296         }
 297
 298         if (req->smb_conn->negotiate.calling_name) {
 299                 remote_machine = req->smb_conn->negotiate.calling_name->name;
 300         }
 301
 302         remote_address = socket_get_remote_addr(req->smb_conn->connection->socket, req);
 303         if (!remote_address) goto nomem;
 304
 305         if (!remote_machine) {
 306                 remote_machine = tsocket_address_inet_addr_string(remote_address, req);
 307                 if (!remote_machine) goto nomem;
 308         }
 309
 310         user_info = talloc(req, struct auth_usersupplied_info);
 311         if (!user_info) goto nomem;
 312
 313         user_info->mapped_state = false;
 314         user_info->logon_parameters = 0;
 315         user_info->flags = 0;
 316         user_info->client.account_name = sess->nt1.in.user;
 317         user_info->client.domain_name = sess->nt1.in.domain;
 318         user_info->workstation_name = remote_machine;
 319         user_info->remote_host = talloc_steal(user_info, remote_address);
 320
 321         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 322         user_info->password.response.lanman = sess->nt1.in.password1;
 323         user_info->password.response.lanman.data = talloc_steal(user_info, sess->nt1.in.password1.data);
 324         user_info->password.response.nt = sess->nt1.in.password2;
 325         user_info->password.response.nt.data = talloc_steal(user_info, sess->nt1.in.password2.data);
 326
 327         subreq = auth_check_password_send(state,
 328                                           req->smb_conn->connection->event.ctx,
 329                                           state->auth_context,
 330                                           user_info);
 331         if (!subreq) goto nomem;
 332         tevent_req_set_callback(subreq, sesssetup_nt1_send, state);
 333
 334         return;
 335
 336 nomem:
 337         status = NT_STATUS_NO_MEMORY;
 338 failed:
 339         status = auth_nt_status_squash(status);
 340         smbsrv_sesssetup_backend_send(req, sess, status);
 341 }
 342
 343 struct sesssetup_spnego_state {
 344         struct smbsrv_request *req;
 345         union smb_sesssetup *sess;
 346         struct smbsrv_session *smb_sess;
 347 };
 348
 349 static void sesssetup_spnego_send(struct tevent_req *subreq)
 350 {
 351         struct sesssetup_spnego_state *s = tevent_req_callback_data(subreq,
 352                                            struct sesssetup_spnego_state);
 353         struct smbsrv_request *req = s->req;
 354         union smb_sesssetup *sess = s->sess;
 355         struct smbsrv_session *smb_sess = s->smb_sess;
 356         struct auth_session_info *session_info = NULL;
 357         NTSTATUS status;
 358         NTSTATUS skey_status;
 359         DATA_BLOB session_key;
 360
 361         status = gensec_update_recv(subreq, req, &sess->spnego.out.secblob);
 362         TALLOC_FREE(subreq);
 363         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 364                 goto done;
 365         } else if (!NT_STATUS_IS_OK(status)) {
 366                 goto failed;
 367         }
 368
 369         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
 370         if (!NT_STATUS_IS_OK(status)) goto failed;
 371
 372         skey_status = gensec_session_key(smb_sess->gensec_ctx, &session_key);
 373         if (NT_STATUS_IS_OK(skey_status)) {
 374                 smbsrv_setup_signing(req->smb_conn, &session_key, NULL);
 375         }
 376
 377         /* Ensure this is marked as a 'real' vuid, not one
 378          * simply valid for the session setup leg */
 379         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 380         if (!NT_STATUS_IS_OK(status)) goto failed;
 381
 382         req->session = smb_sess;
 383
 384 done:
 385         sess->spnego.out.vuid = smb_sess->vuid;
 386 failed:
 387         status = auth_nt_status_squash(status);
 388         smbsrv_sesssetup_backend_send(req, sess, status);
 389         if (!NT_STATUS_IS_OK(status) &&
 390             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 391                 talloc_free(smb_sess);
 392         }
 393 }
 394
 395 /*
 396   handler for SPNEGO style session setup
 397 */
 398 static void sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
 399 {
 400         NTSTATUS status;
 401         struct smbsrv_session *smb_sess = NULL;
 402         struct sesssetup_spnego_state *s = NULL;
 403         uint16_t vuid;
 404         struct tevent_req *subreq;
 405
 406         sess->spnego.out.vuid = 0;
 407         sess->spnego.out.action = 0;
 408
 409         sesssetup_common_strings(req,
 410                                  &sess->spnego.out.os,
 411                                  &sess->spnego.out.lanman,
 412                                  &sess->spnego.out.workgroup);
 413
 414         if (!req->smb_conn->negotiate.done_sesssetup) {
 415                 req->smb_conn->negotiate.max_send = sess->spnego.in.bufsize;
 416                 req->smb_conn->negotiate.client_caps = sess->spnego.in.capabilities;
 417         }
 418
 419         vuid = SVAL(req->in.hdr,HDR_UID);
 420
 421         /* lookup an existing session */
 422         smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
 423         if (!smb_sess) {
 424                 struct gensec_security *gensec_ctx;
 425
 426                 status = samba_server_gensec_start(req,
 427                                                    req->smb_conn->connection->event.ctx,
 428                                                    req->smb_conn->connection->msg_ctx,
 429                                                    req->smb_conn->lp_ctx,
 430                                                    req->smb_conn->negotiate.server_credentials,
 431                                                    "cifs",
 432                                                    &gensec_ctx);
 433                 if (!NT_STATUS_IS_OK(status)) {
 434                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 435                         goto failed;
 436                 }
 437
 438                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 439
 440                 status = gensec_start_mech_by_oid(gensec_ctx, req->smb_conn->negotiate.oid);
 441                 if (!NT_STATUS_IS_OK(status)) {
 442                         DEBUG(1, ("Failed to start GENSEC %s server code: %s\n",
 443                                   gensec_get_name_by_oid(gensec_ctx, req->smb_conn->negotiate.oid), nt_errstr(status)));
 444                         goto failed;
 445                 }
 446
 447                 /* allocate a new session */
 448                 smb_sess = smbsrv_session_new(req->smb_conn, req->smb_conn, gensec_ctx);
 449                 if (!smb_sess) {
 450                         status = NT_STATUS_INSUFFICIENT_RESOURCES;
 451                         goto failed;
 452                 }
 453         }
 454
 455         if (!smb_sess) {
 456                 status = NT_STATUS_ACCESS_DENIED;
 457                 goto failed;
 458         }
 459
 460         if (!smb_sess->gensec_ctx) {
 461                 status = NT_STATUS_INTERNAL_ERROR;
 462                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
 463                 goto failed;
 464         }
 465
 466         s = talloc(req, struct sesssetup_spnego_state);
 467         if (!s) goto nomem;
 468         s->req          = req;
 469         s->sess         = sess;
 470         s->smb_sess     = smb_sess;
 471
 472         subreq = gensec_update_send(s,
 473                                     req->smb_conn->connection->event.ctx,
 474                                     smb_sess->gensec_ctx,
 475                                     sess->spnego.in.secblob);
 476         if (!subreq) {
 477                 goto nomem;
 478         }
 479         tevent_req_set_callback(subreq, sesssetup_spnego_send, s);
 480
 481         return;
 482
 483 nomem:
 484         status = NT_STATUS_NO_MEMORY;
 485 failed:
 486         talloc_free(smb_sess);
 487         status = auth_nt_status_squash(status);
 488         smbsrv_sesssetup_backend_send(req, sess, status);
 489 }
 490
 491 /*
 492   backend for sessionsetup call - this takes all 3 variants of the call
 493 */
 494 void smbsrv_sesssetup_backend(struct smbsrv_request *req,
 495                               union smb_sesssetup *sess)
 496 {
 497         switch (sess->old.level) {
 498                 case RAW_SESSSETUP_OLD:
 499                         sesssetup_old(req, sess);
 500                         return;
 501
 502                 case RAW_SESSSETUP_NT1:
 503                         sesssetup_nt1(req, sess);
 504                         return;
 505
 506                 case RAW_SESSSETUP_SPNEGO:
 507                         sesssetup_spnego(req, sess);
 508                         return;
 509
 510                 case RAW_SESSSETUP_SMB2:
 511                         break;
 512         }
 513
 514         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_INVALID_LEVEL);
 515 }