source/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 "version.h"
  27 #include "auth/credentials/credentials.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 "librpc/gen_ndr/nbt.h"
  33 #include "param/param.h"
  34
  35 /*
  36   setup the OS, Lanman and domain portions of a session setup reply
  37 */
  38 static void sesssetup_common_strings(struct smbsrv_request *req,
  39                                      char **os, char **lanman, char **domain)
  40 {
  41         (*os) = talloc_asprintf(req, "Unix");
  42         (*lanman) = talloc_asprintf(req, "Samba %s", SAMBA_VERSION_STRING);
  43         (*domain) = talloc_asprintf(req, "%s", lp_workgroup(global_loadparm));
  44 }
  45
  46 static void smbsrv_sesssetup_backend_send(struct smbsrv_request *req,
  47                                           union smb_sesssetup *sess,
  48                                           NTSTATUS status)
  49 {
  50         if (NT_STATUS_IS_OK(status)) {
  51                 req->smb_conn->negotiate.done_sesssetup = true;
  52                 /* we need to keep the session long term */
  53                 req->session = talloc_steal(req->smb_conn, req->session);
  54         }
  55         smbsrv_reply_sesssetup_send(req, sess, status);
  56 }
  57
  58 static void sesssetup_old_send(struct auth_check_password_request *areq,
  59                                void *private_data)
  60 {
  61         struct smbsrv_request *req = talloc_get_type(private_data, struct smbsrv_request);
  62         union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
  63         struct auth_serversupplied_info *server_info = NULL;
  64         struct auth_session_info *session_info;
  65         struct smbsrv_session *smb_sess;
  66         NTSTATUS status;
  67
  68         status = auth_check_password_recv(areq, req, &server_info);
  69         if (!NT_STATUS_IS_OK(status)) goto failed;
  70
  71         /* This references server_info into session_info */
  72         status = auth_generate_session_info(req, server_info, &session_info);
  73         if (!NT_STATUS_IS_OK(status)) goto failed;
  74
  75         /* allocate a new session */
  76         smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
  77         if (!smb_sess) {
  78                 status = NT_STATUS_INSUFFICIENT_RESOURCES;
  79                 goto failed;
  80         }
  81
  82         /* Ensure this is marked as a 'real' vuid, not one
  83          * simply valid for the session setup leg */
  84         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
  85         if (!NT_STATUS_IS_OK(status)) goto failed;
  86
  87         /* To correctly process any AndX packet (like a tree connect)
  88          * we need to fill in the session on the request here */
  89         req->session = smb_sess;
  90         sess->old.out.vuid = smb_sess->vuid;
  91
  92 failed:
  93         status = auth_nt_status_squash(status);
  94         smbsrv_sesssetup_backend_send(req, sess, status);
  95 }
  96
  97 /*
  98   handler for old style session setup
  99 */
 100 static void sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
 101 {
 102         struct auth_usersupplied_info *user_info = NULL;
 103         struct socket_address *remote_address;
 104         const char *remote_machine = NULL;
 105
 106         sess->old.out.vuid = 0;
 107         sess->old.out.action = 0;
 108
 109         sesssetup_common_strings(req,
 110                                  &sess->old.out.os,
 111                                  &sess->old.out.lanman,
 112                                  &sess->old.out.domain);
 113
 114         if (!req->smb_conn->negotiate.done_sesssetup) {
 115                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
 116         }
 117
 118         if (req->smb_conn->negotiate.calling_name) {
 119                 remote_machine = req->smb_conn->negotiate.calling_name->name;
 120         }
 121
 122         remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
 123         if (!remote_address) goto nomem;
 124
 125         if (!remote_machine) {
 126                 remote_machine = remote_address->addr;
 127         }
 128
 129         user_info = talloc(req, struct auth_usersupplied_info);
 130         if (!user_info) goto nomem;
 131
 132         user_info->mapped_state = false;
 133         user_info->logon_parameters = 0;
 134         user_info->flags = 0;
 135         user_info->client.account_name = sess->old.in.user;
 136         user_info->client.domain_name = sess->old.in.domain;
 137         user_info->workstation_name = remote_machine;
 138         user_info->remote_host = talloc_steal(user_info, remote_address);
 139
 140         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 141         user_info->password.response.lanman = sess->old.in.password;
 142         user_info->password.response.lanman.data = talloc_steal(user_info, sess->old.in.password.data);
 143         user_info->password.response.nt = data_blob(NULL, 0);
 144
 145         auth_check_password_send(req->smb_conn->negotiate.auth_context, user_info,
 146                                  sesssetup_old_send, req);
 147         return;
 148
 149 nomem:
 150         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_NO_MEMORY);
 151 }
 152
 153 static void sesssetup_nt1_send(struct auth_check_password_request *areq,
 154                                void *private_data)
 155 {
 156         struct smbsrv_request *req = talloc_get_type(private_data, struct smbsrv_request);
 157         union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
 158         struct auth_serversupplied_info *server_info = NULL;
 159         struct auth_session_info *session_info;
 160         struct smbsrv_session *smb_sess;
 161         NTSTATUS status;
 162
 163         status = auth_check_password_recv(areq, req, &server_info);
 164         if (!NT_STATUS_IS_OK(status)) goto failed;
 165
 166         /* This references server_info into session_info */
 167         status = auth_generate_session_info(req, server_info, &session_info);
 168         if (!NT_STATUS_IS_OK(status)) goto failed;
 169
 170         /* allocate a new session */
 171         smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
 172         if (!smb_sess) {
 173                 status = NT_STATUS_INSUFFICIENT_RESOURCES;
 174                 goto failed;
 175         }
 176
 177         /* Ensure this is marked as a 'real' vuid, not one
 178          * simply valid for the session setup leg */
 179         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 180         if (!NT_STATUS_IS_OK(status)) goto failed;
 181
 182         /* To correctly process any AndX packet (like a tree connect)
 183          * we need to fill in the session on the request here */
 184         req->session = smb_sess;
 185         sess->nt1.out.vuid = smb_sess->vuid;
 186
 187         if (!session_info->server_info->authenticated) {
 188                 /* don't try signing as anonymous */
 189                 goto done;
 190         }
 191
 192         if (!smbsrv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
 193                 /* Already signing, or disabled */
 194                 goto done;
 195         }
 196
 197         /* Force check of the request packet, now we know the session key */
 198         smbsrv_signing_check_incoming(req);
 199 /* TODO: why don't we check the result here? */
 200
 201         /* Unfortunetly win2k3 as a client doesn't sign the request
 202          * packet here, so we have to force signing to start again */
 203
 204         smbsrv_signing_restart(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2);
 205
 206 done:
 207         status = NT_STATUS_OK;
 208 failed:
 209         status = auth_nt_status_squash(status);
 210         smbsrv_sesssetup_backend_send(req, sess, status);
 211 }
 212
 213 /*
 214   handler for NT1 style session setup
 215 */
 216 static void sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
 217 {
 218         NTSTATUS status;
 219         struct auth_context *auth_context;
 220         struct auth_usersupplied_info *user_info = NULL;
 221         struct socket_address *remote_address;
 222         const char *remote_machine = NULL;
 223
 224         sess->nt1.out.vuid = 0;
 225         sess->nt1.out.action = 0;
 226
 227         sesssetup_common_strings(req,
 228                                  &sess->nt1.out.os,
 229                                  &sess->nt1.out.lanman,
 230                                  &sess->nt1.out.domain);
 231
 232         if (!req->smb_conn->negotiate.done_sesssetup) {
 233                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 234                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 235         }
 236
 237         if (req->smb_conn->negotiate.oid) {
 238                 if (sess->nt1.in.user && *sess->nt1.in.user) {
 239                         /* We can't accept a normal login, because we
 240                          * don't have a challenge */
 241                         status = NT_STATUS_LOGON_FAILURE;
 242                         goto failed;
 243                 }
 244
 245                 /* TODO: should we use just "anonymous" here? */
 246                 status = auth_context_create(req,
 247                                              req->smb_conn->connection->event.ctx,
 248                                              req->smb_conn->connection->msg_ctx,
 249                                              &auth_context);
 250                 if (!NT_STATUS_IS_OK(status)) goto failed;
 251         } else {
 252                 auth_context = req->smb_conn->negotiate.auth_context;
 253         }
 254
 255         if (req->smb_conn->negotiate.calling_name) {
 256                 remote_machine = req->smb_conn->negotiate.calling_name->name;
 257         }
 258
 259         remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
 260         if (!remote_address) goto nomem;
 261
 262         if (!remote_machine) {
 263                 remote_machine = remote_address->addr;
 264         }
 265
 266         user_info = talloc(req, struct auth_usersupplied_info);
 267         if (!user_info) goto nomem;
 268
 269         user_info->mapped_state = false;
 270         user_info->logon_parameters = 0;
 271         user_info->flags = 0;
 272         user_info->client.account_name = sess->nt1.in.user;
 273         user_info->client.domain_name = sess->nt1.in.domain;
 274         user_info->workstation_name = remote_machine;
 275         user_info->remote_host = talloc_steal(user_info, remote_address);
 276
 277         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 278         user_info->password.response.lanman = sess->nt1.in.password1;
 279         user_info->password.response.lanman.data = talloc_steal(user_info, sess->nt1.in.password1.data);
 280         user_info->password.response.nt = sess->nt1.in.password2;
 281         user_info->password.response.nt.data = talloc_steal(user_info, sess->nt1.in.password2.data);
 282
 283         auth_check_password_send(auth_context, user_info,
 284                                  sesssetup_nt1_send, req);
 285         return;
 286
 287 nomem:
 288         status = NT_STATUS_NO_MEMORY;
 289 failed:
 290         status = auth_nt_status_squash(status);
 291         smbsrv_sesssetup_backend_send(req, sess, status);
 292 }
 293
 294 struct sesssetup_spnego_state {
 295         struct smbsrv_request *req;
 296         union smb_sesssetup *sess;
 297         struct smbsrv_session *smb_sess;
 298 };
 299
 300 static void sesssetup_spnego_send(struct gensec_update_request *greq, void *private_data)
 301 {
 302         struct sesssetup_spnego_state *s = talloc_get_type(private_data,
 303                                            struct sesssetup_spnego_state);
 304         struct smbsrv_request *req = s->req;
 305         union smb_sesssetup *sess = s->sess;
 306         struct smbsrv_session *smb_sess = s->smb_sess;
 307         struct auth_session_info *session_info = NULL;
 308         NTSTATUS status;
 309         NTSTATUS skey_status;
 310         DATA_BLOB session_key;
 311
 312         status = gensec_update_recv(greq, req, &sess->spnego.out.secblob);
 313         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 314                 goto done;
 315         } else if (!NT_STATUS_IS_OK(status)) {
 316                 goto failed;
 317         }
 318
 319         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
 320         if (!NT_STATUS_IS_OK(status)) goto failed;
 321
 322         skey_status = gensec_session_key(smb_sess->gensec_ctx, &session_key);
 323         if (NT_STATUS_IS_OK(skey_status) &&
 324             session_info->server_info->authenticated &&
 325             smbsrv_setup_signing(req->smb_conn, &session_key, NULL)) {
 326                 /* Force check of the request packet, now we know the session key */
 327                 smbsrv_signing_check_incoming(req);
 328
 329                 smbsrv_signing_restart(req->smb_conn, &session_key, NULL);
 330         }
 331
 332         /* Ensure this is marked as a 'real' vuid, not one
 333          * simply valid for the session setup leg */
 334         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 335         if (!NT_STATUS_IS_OK(status)) goto failed;
 336
 337         req->session = smb_sess;
 338
 339 done:
 340         sess->spnego.out.vuid = smb_sess->vuid;
 341 failed:
 342         status = auth_nt_status_squash(status);
 343         smbsrv_sesssetup_backend_send(req, sess, status);
 344         if (!NT_STATUS_IS_OK(status) &&
 345             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 346                 talloc_free(smb_sess);
 347         }
 348 }
 349
 350 /*
 351   handler for SPNEGO style session setup
 352 */
 353 static void sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
 354 {
 355         NTSTATUS status;
 356         struct smbsrv_session *smb_sess = NULL;
 357         struct sesssetup_spnego_state *s = NULL;
 358         uint16_t vuid;
 359
 360         sess->spnego.out.vuid = 0;
 361         sess->spnego.out.action = 0;
 362
 363         sesssetup_common_strings(req,
 364                                  &sess->spnego.out.os,
 365                                  &sess->spnego.out.lanman,
 366                                  &sess->spnego.out.workgroup);
 367
 368         if (!req->smb_conn->negotiate.done_sesssetup) {
 369                 req->smb_conn->negotiate.max_send = sess->spnego.in.bufsize;
 370                 req->smb_conn->negotiate.client_caps = sess->spnego.in.capabilities;
 371         }
 372
 373         vuid = SVAL(req->in.hdr,HDR_UID);
 374
 375         /* lookup an existing session */
 376         smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
 377         if (!smb_sess) {
 378                 struct gensec_security *gensec_ctx;
 379
 380                 status = gensec_server_start(req,
 381                                              req->smb_conn->connection->event.ctx,
 382                                              req->smb_conn->connection->msg_ctx,
 383                                              &gensec_ctx);
 384                 if (!NT_STATUS_IS_OK(status)) {
 385                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 386                         goto failed;
 387                 }
 388
 389                 gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
 390
 391                 gensec_set_target_service(gensec_ctx, "cifs");
 392
 393                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 394
 395                 status = gensec_start_mech_by_oid(gensec_ctx, req->smb_conn->negotiate.oid);
 396                 if (!NT_STATUS_IS_OK(status)) {
 397                         DEBUG(1, ("Failed to start GENSEC %s server code: %s\n",
 398                                   gensec_get_name_by_oid(req->smb_conn->negotiate.oid), nt_errstr(status)));
 399                         goto failed;
 400                 }
 401
 402                 /* allocate a new session */
 403                 smb_sess = smbsrv_session_new(req->smb_conn, req->smb_conn, gensec_ctx);
 404                 if (!smb_sess) {
 405                         status = NT_STATUS_INSUFFICIENT_RESOURCES;
 406                         goto failed;
 407                 }
 408         }
 409
 410         if (!smb_sess) {
 411                 status = NT_STATUS_ACCESS_DENIED;
 412                 goto failed;
 413         }
 414
 415         if (!smb_sess->gensec_ctx) {
 416                 status = NT_STATUS_INTERNAL_ERROR;
 417                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
 418                 goto failed;
 419         }
 420
 421         s = talloc(req, struct sesssetup_spnego_state);
 422         if (!s) goto nomem;
 423         s->req          = req;
 424         s->sess         = sess;
 425         s->smb_sess     = smb_sess;
 426
 427         gensec_update_send(smb_sess->gensec_ctx, sess->spnego.in.secblob,
 428                            sesssetup_spnego_send, s);
 429         return;
 430
 431 nomem:
 432         status = NT_STATUS_NO_MEMORY;
 433 failed:
 434         talloc_free(smb_sess);
 435         status = auth_nt_status_squash(status);
 436         smbsrv_sesssetup_backend_send(req, sess, status);
 437 }
 438
 439 /*
 440   backend for sessionsetup call - this takes all 3 variants of the call
 441 */
 442 void smbsrv_sesssetup_backend(struct smbsrv_request *req,
 443                               union smb_sesssetup *sess)
 444 {
 445         switch (sess->old.level) {
 446                 case RAW_SESSSETUP_OLD:
 447                         sesssetup_old(req, sess);
 448                         return;
 449
 450                 case RAW_SESSSETUP_NT1:
 451                         sesssetup_nt1(req, sess);
 452                         return;
 453
 454                 case RAW_SESSSETUP_SPNEGO:
 455                         sesssetup_spnego(req, sess);
 456                         return;
 457
 458                 case RAW_SESSSETUP_SMB2:
 459                         break;
 460         }
 461
 462         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_INVALID_LEVEL);
 463 }