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 "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",
  44                                     lp_workgroup(req->smb_conn->lp_ctx));
  45 }
  46
  47 static void smbsrv_sesssetup_backend_send(struct smbsrv_request *req,
  48                                           union smb_sesssetup *sess,
  49                                           NTSTATUS status)
  50 {
  51         if (NT_STATUS_IS_OK(status)) {
  52                 req->smb_conn->negotiate.done_sesssetup = true;
  53                 /* we need to keep the session long term */
  54                 req->session = talloc_steal(req->smb_conn, req->session);
  55         }
  56         smbsrv_reply_sesssetup_send(req, sess, status);
  57 }
  58
  59 static void sesssetup_old_send(struct auth_check_password_request *areq,
  60                                void *private_data)
  61 {
  62         struct smbsrv_request *req = talloc_get_type(private_data, struct smbsrv_request);
  63         union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
  64         struct auth_serversupplied_info *server_info = NULL;
  65         struct auth_session_info *session_info;
  66         struct smbsrv_session *smb_sess;
  67         NTSTATUS status;
  68
  69         status = auth_check_password_recv(areq, req, &server_info);
  70         if (!NT_STATUS_IS_OK(status)) goto failed;
  71
  72         /* This references server_info into session_info */
  73         status = auth_generate_session_info(req, req->smb_conn->connection->event.ctx, req->smb_conn->lp_ctx,
  74                                             server_info, &session_info);
  75         if (!NT_STATUS_IS_OK(status)) goto failed;
  76
  77         /* allocate a new session */
  78         smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
  79         if (!smb_sess) {
  80                 status = NT_STATUS_INSUFFICIENT_RESOURCES;
  81                 goto failed;
  82         }
  83
  84         /* Ensure this is marked as a 'real' vuid, not one
  85          * simply valid for the session setup leg */
  86         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
  87         if (!NT_STATUS_IS_OK(status)) goto failed;
  88
  89         /* To correctly process any AndX packet (like a tree connect)
  90          * we need to fill in the session on the request here */
  91         req->session = smb_sess;
  92         sess->old.out.vuid = smb_sess->vuid;
  93
  94 failed:
  95         status = auth_nt_status_squash(status);
  96         smbsrv_sesssetup_backend_send(req, sess, status);
  97 }
  98
  99 /*
 100   handler for old style session setup
 101 */
 102 static void sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
 103 {
 104         struct auth_usersupplied_info *user_info = NULL;
 105         struct socket_address *remote_address;
 106         const char *remote_machine = NULL;
 107
 108         sess->old.out.vuid = 0;
 109         sess->old.out.action = 0;
 110
 111         sesssetup_common_strings(req,
 112                                  &sess->old.out.os,
 113                                  &sess->old.out.lanman,
 114                                  &sess->old.out.domain);
 115
 116         if (!req->smb_conn->negotiate.done_sesssetup) {
 117                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
 118         }
 119
 120         if (req->smb_conn->negotiate.calling_name) {
 121                 remote_machine = req->smb_conn->negotiate.calling_name->name;
 122         }
 123
 124         remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
 125         if (!remote_address) goto nomem;
 126
 127         if (!remote_machine) {
 128                 remote_machine = remote_address->addr;
 129         }
 130
 131         user_info = talloc(req, struct auth_usersupplied_info);
 132         if (!user_info) goto nomem;
 133
 134         user_info->mapped_state = false;
 135         user_info->logon_parameters = 0;
 136         user_info->flags = 0;
 137         user_info->client.account_name = sess->old.in.user;
 138         user_info->client.domain_name = sess->old.in.domain;
 139         user_info->workstation_name = remote_machine;
 140         user_info->remote_host = talloc_steal(user_info, remote_address);
 141
 142         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 143         user_info->password.response.lanman = sess->old.in.password;
 144         user_info->password.response.lanman.data = talloc_steal(user_info, sess->old.in.password.data);
 145         user_info->password.response.nt = data_blob(NULL, 0);
 146
 147         auth_check_password_send(req->smb_conn->negotiate.auth_context, user_info,
 148                                  sesssetup_old_send, req);
 149         return;
 150
 151 nomem:
 152         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_NO_MEMORY);
 153 }
 154
 155 static void sesssetup_nt1_send(struct auth_check_password_request *areq,
 156                                void *private_data)
 157 {
 158         struct smbsrv_request *req = talloc_get_type(private_data, struct smbsrv_request);
 159         union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
 160         struct auth_serversupplied_info *server_info = NULL;
 161         struct auth_session_info *session_info;
 162         struct smbsrv_session *smb_sess;
 163         NTSTATUS status;
 164
 165         status = auth_check_password_recv(areq, req, &server_info);
 166         if (!NT_STATUS_IS_OK(status)) goto failed;
 167
 168         /* This references server_info into session_info */
 169         status = auth_generate_session_info(req, req->smb_conn->connection->event.ctx,
 170                                             req->smb_conn->lp_ctx,
 171                                             server_info, &session_info);
 172         if (!NT_STATUS_IS_OK(status)) goto failed;
 173
 174         /* allocate a new session */
 175         smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
 176         if (!smb_sess) {
 177                 status = NT_STATUS_INSUFFICIENT_RESOURCES;
 178                 goto failed;
 179         }
 180
 181         /* Ensure this is marked as a 'real' vuid, not one
 182          * simply valid for the session setup leg */
 183         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 184         if (!NT_STATUS_IS_OK(status)) goto failed;
 185
 186         /* To correctly process any AndX packet (like a tree connect)
 187          * we need to fill in the session on the request here */
 188         req->session = smb_sess;
 189         sess->nt1.out.vuid = smb_sess->vuid;
 190
 191         if (!session_info->server_info->authenticated) {
 192                 /* don't try signing as anonymous */
 193                 goto done;
 194         }
 195
 196         if (!smbsrv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
 197                 /* Already signing, or disabled */
 198                 goto done;
 199         }
 200
 201         /* Force check of the request packet, now we know the session key */
 202         smbsrv_signing_check_incoming(req);
 203 /* TODO: why don't we check the result here? */
 204
 205         /* Unfortunetly win2k3 as a client doesn't sign the request
 206          * packet here, so we have to force signing to start again */
 207
 208         smbsrv_signing_restart(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2);
 209
 210 done:
 211         status = NT_STATUS_OK;
 212 failed:
 213         status = auth_nt_status_squash(status);
 214         smbsrv_sesssetup_backend_send(req, sess, status);
 215 }
 216
 217 /*
 218   handler for NT1 style session setup
 219 */
 220 static void sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
 221 {
 222         NTSTATUS status;
 223         struct auth_context *auth_context;
 224         struct auth_usersupplied_info *user_info = NULL;
 225         struct socket_address *remote_address;
 226         const char *remote_machine = NULL;
 227
 228         sess->nt1.out.vuid = 0;
 229         sess->nt1.out.action = 0;
 230
 231         sesssetup_common_strings(req,
 232                                  &sess->nt1.out.os,
 233                                  &sess->nt1.out.lanman,
 234                                  &sess->nt1.out.domain);
 235
 236         if (!req->smb_conn->negotiate.done_sesssetup) {
 237                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 238                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 239         }
 240
 241         if (req->smb_conn->negotiate.oid) {
 242                 if (sess->nt1.in.user && *sess->nt1.in.user) {
 243                         /* We can't accept a normal login, because we
 244                          * don't have a challenge */
 245                         status = NT_STATUS_LOGON_FAILURE;
 246                         goto failed;
 247                 }
 248
 249                 /* TODO: should we use just "anonymous" here? */
 250                 status = auth_context_create(req,
 251                                              req->smb_conn->connection->event.ctx,
 252                                              req->smb_conn->connection->msg_ctx,
 253                                              req->smb_conn->lp_ctx,
 254                                              &auth_context);
 255                 if (!NT_STATUS_IS_OK(status)) goto failed;
 256         } else {
 257                 auth_context = req->smb_conn->negotiate.auth_context;
 258         }
 259
 260         if (req->smb_conn->negotiate.calling_name) {
 261                 remote_machine = req->smb_conn->negotiate.calling_name->name;
 262         }
 263
 264         remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
 265         if (!remote_address) goto nomem;
 266
 267         if (!remote_machine) {
 268                 remote_machine = remote_address->addr;
 269         }
 270
 271         user_info = talloc(req, struct auth_usersupplied_info);
 272         if (!user_info) goto nomem;
 273
 274         user_info->mapped_state = false;
 275         user_info->logon_parameters = 0;
 276         user_info->flags = 0;
 277         user_info->client.account_name = sess->nt1.in.user;
 278         user_info->client.domain_name = sess->nt1.in.domain;
 279         user_info->workstation_name = remote_machine;
 280         user_info->remote_host = talloc_steal(user_info, remote_address);
 281
 282         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 283         user_info->password.response.lanman = sess->nt1.in.password1;
 284         user_info->password.response.lanman.data = talloc_steal(user_info, sess->nt1.in.password1.data);
 285         user_info->password.response.nt = sess->nt1.in.password2;
 286         user_info->password.response.nt.data = talloc_steal(user_info, sess->nt1.in.password2.data);
 287
 288         auth_check_password_send(auth_context, user_info,
 289                                  sesssetup_nt1_send, req);
 290         return;
 291
 292 nomem:
 293         status = NT_STATUS_NO_MEMORY;
 294 failed:
 295         status = auth_nt_status_squash(status);
 296         smbsrv_sesssetup_backend_send(req, sess, status);
 297 }
 298
 299 struct sesssetup_spnego_state {
 300         struct smbsrv_request *req;
 301         union smb_sesssetup *sess;
 302         struct smbsrv_session *smb_sess;
 303 };
 304
 305 static void sesssetup_spnego_send(struct gensec_update_request *greq, void *private_data)
 306 {
 307         struct sesssetup_spnego_state *s = talloc_get_type(private_data,
 308                                            struct sesssetup_spnego_state);
 309         struct smbsrv_request *req = s->req;
 310         union smb_sesssetup *sess = s->sess;
 311         struct smbsrv_session *smb_sess = s->smb_sess;
 312         struct auth_session_info *session_info = NULL;
 313         NTSTATUS status;
 314         NTSTATUS skey_status;
 315         DATA_BLOB session_key;
 316
 317         status = gensec_update_recv(greq, req, &sess->spnego.out.secblob);
 318         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 319                 goto done;
 320         } else if (!NT_STATUS_IS_OK(status)) {
 321                 goto failed;
 322         }
 323
 324         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
 325         if (!NT_STATUS_IS_OK(status)) goto failed;
 326
 327         skey_status = gensec_session_key(smb_sess->gensec_ctx, &session_key);
 328         if (NT_STATUS_IS_OK(skey_status) &&
 329             session_info->server_info->authenticated &&
 330             smbsrv_setup_signing(req->smb_conn, &session_key, NULL)) {
 331                 /* Force check of the request packet, now we know the session key */
 332                 smbsrv_signing_check_incoming(req);
 333
 334                 smbsrv_signing_restart(req->smb_conn, &session_key, NULL);
 335         }
 336
 337         /* Ensure this is marked as a 'real' vuid, not one
 338          * simply valid for the session setup leg */
 339         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 340         if (!NT_STATUS_IS_OK(status)) goto failed;
 341
 342         req->session = smb_sess;
 343
 344 done:
 345         sess->spnego.out.vuid = smb_sess->vuid;
 346 failed:
 347         status = auth_nt_status_squash(status);
 348         smbsrv_sesssetup_backend_send(req, sess, status);
 349         if (!NT_STATUS_IS_OK(status) &&
 350             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 351                 talloc_free(smb_sess);
 352         }
 353 }
 354
 355 /*
 356   handler for SPNEGO style session setup
 357 */
 358 static void sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
 359 {
 360         NTSTATUS status;
 361         struct smbsrv_session *smb_sess = NULL;
 362         struct sesssetup_spnego_state *s = NULL;
 363         uint16_t vuid;
 364
 365         sess->spnego.out.vuid = 0;
 366         sess->spnego.out.action = 0;
 367
 368         sesssetup_common_strings(req,
 369                                  &sess->spnego.out.os,
 370                                  &sess->spnego.out.lanman,
 371                                  &sess->spnego.out.workgroup);
 372
 373         if (!req->smb_conn->negotiate.done_sesssetup) {
 374                 req->smb_conn->negotiate.max_send = sess->spnego.in.bufsize;
 375                 req->smb_conn->negotiate.client_caps = sess->spnego.in.capabilities;
 376         }
 377
 378         vuid = SVAL(req->in.hdr,HDR_UID);
 379
 380         /* lookup an existing session */
 381         smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
 382         if (!smb_sess) {
 383                 struct gensec_security *gensec_ctx;
 384
 385                 status = gensec_server_start(req,
 386                                              req->smb_conn->connection->event.ctx,
 387                                              req->smb_conn->lp_ctx,
 388                                              req->smb_conn->connection->msg_ctx,
 389                                              &gensec_ctx);
 390                 if (!NT_STATUS_IS_OK(status)) {
 391                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 392                         goto failed;
 393                 }
 394
 395                 gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
 396
 397                 gensec_set_target_service(gensec_ctx, "cifs");
 398
 399                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 400
 401                 status = gensec_start_mech_by_oid(gensec_ctx, req->smb_conn->negotiate.oid);
 402                 if (!NT_STATUS_IS_OK(status)) {
 403                         DEBUG(1, ("Failed to start GENSEC %s server code: %s\n",
 404                                   gensec_get_name_by_oid(req->smb_conn->negotiate.oid), nt_errstr(status)));
 405                         goto failed;
 406                 }
 407
 408                 /* allocate a new session */
 409                 smb_sess = smbsrv_session_new(req->smb_conn, req->smb_conn, gensec_ctx);
 410                 if (!smb_sess) {
 411                         status = NT_STATUS_INSUFFICIENT_RESOURCES;
 412                         goto failed;
 413                 }
 414         }
 415
 416         if (!smb_sess) {
 417                 status = NT_STATUS_ACCESS_DENIED;
 418                 goto failed;
 419         }
 420
 421         if (!smb_sess->gensec_ctx) {
 422                 status = NT_STATUS_INTERNAL_ERROR;
 423                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
 424                 goto failed;
 425         }
 426
 427         s = talloc(req, struct sesssetup_spnego_state);
 428         if (!s) goto nomem;
 429         s->req          = req;
 430         s->sess         = sess;
 431         s->smb_sess     = smb_sess;
 432
 433         gensec_update_send(smb_sess->gensec_ctx, sess->spnego.in.secblob,
 434                            sesssetup_spnego_send, s);
 435         return;
 436
 437 nomem:
 438         status = NT_STATUS_NO_MEMORY;
 439 failed:
 440         talloc_free(smb_sess);
 441         status = auth_nt_status_squash(status);
 442         smbsrv_sesssetup_backend_send(req, sess, status);
 443 }
 444
 445 /*
 446   backend for sessionsetup call - this takes all 3 variants of the call
 447 */
 448 void smbsrv_sesssetup_backend(struct smbsrv_request *req,
 449                               union smb_sesssetup *sess)
 450 {
 451         switch (sess->old.level) {
 452                 case RAW_SESSSETUP_OLD:
 453                         sesssetup_old(req, sess);
 454                         return;
 455
 456                 case RAW_SESSSETUP_NT1:
 457                         sesssetup_nt1(req, sess);
 458                         return;
 459
 460                 case RAW_SESSSETUP_SPNEGO:
 461                         sesssetup_spnego(req, sess);
 462                         return;
 463
 464                 case RAW_SESSSETUP_SMB2:
 465                         break;
 466         }
 467
 468         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_INVALID_LEVEL);
 469 }