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 2 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, write to the Free Software
  23    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26 #include "includes.h"
  27 #include "version.h"
  28 #include "auth/credentials/credentials.h"
  29 #include "auth/gensec/gensec.h"
  30 #include "auth/auth.h"
  31 #include "smb_server/smb_server.h"
  32 #include "smbd/service_stream.h"
  33 #include "librpc/gen_ndr/nbt.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());
  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         }
  53         smbsrv_reply_sesssetup_send(req, sess, status);
  54 }
  55
  56 static void sesssetup_old_send(struct auth_check_password_request *areq,
  57                                void *private_data)
  58 {
  59         struct smbsrv_request *req = talloc_get_type(private_data, struct smbsrv_request);
  60         union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
  61         struct auth_serversupplied_info *server_info = NULL;
  62         struct auth_session_info *session_info;
  63         struct smbsrv_session *smb_sess;
  64         NTSTATUS status;
  65
  66         status = auth_check_password_recv(areq, req, &server_info);
  67         if (!NT_STATUS_IS_OK(status)) goto failed;
  68
  69         /* This references server_info into session_info */
  70         status = auth_generate_session_info(req, server_info, &session_info);
  71         if (!NT_STATUS_IS_OK(status)) goto failed;
  72
  73         /* allocate a new session */
  74         smb_sess = smbsrv_session_new(req->smb_conn, NULL);
  75         if (!smb_sess) {
  76                 status = NT_STATUS_INSUFFICIENT_RESOURCES;
  77                 goto failed;
  78         }
  79
  80         /* Ensure this is marked as a 'real' vuid, not one
  81          * simply valid for the session setup leg */
  82         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
  83         if (!NT_STATUS_IS_OK(status)) goto failed;
  84
  85         /* To correctly process any AndX packet (like a tree connect)
  86          * we need to fill in the session on the request here */
  87         req->session = smb_sess;
  88         sess->old.out.vuid = smb_sess->vuid;
  89
  90 failed:
  91         status = auth_nt_status_squash(status);
  92         smbsrv_sesssetup_backend_send(req, sess, status);
  93 }
  94
  95 /*
  96   handler for old style session setup
  97 */
  98 static void sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
  99 {
 100         struct auth_usersupplied_info *user_info = NULL;
 101         struct socket_address *remote_address;
 102         const char *remote_machine = NULL;
 103
 104         sess->old.out.vuid = 0;
 105         sess->old.out.action = 0;
 106
 107         sesssetup_common_strings(req,
 108                                  &sess->old.out.os,
 109                                  &sess->old.out.lanman,
 110                                  &sess->old.out.domain);
 111
 112         if (!req->smb_conn->negotiate.done_sesssetup) {
 113                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
 114         }
 115
 116         if (req->smb_conn->negotiate.calling_name) {
 117                 remote_machine = req->smb_conn->negotiate.calling_name->name;
 118         }
 119
 120         remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
 121         if (!remote_address) goto nomem;
 122
 123         if (!remote_machine) {
 124                 remote_machine = remote_address->addr;
 125         }
 126
 127         user_info = talloc(req, struct auth_usersupplied_info);
 128         if (!user_info) goto nomem;
 129
 130         user_info->mapped_state = False;
 131         user_info->logon_parameters = 0;
 132         user_info->flags = 0;
 133         user_info->client.account_name = sess->old.in.user;
 134         user_info->client.domain_name = sess->old.in.domain;
 135         user_info->workstation_name = remote_machine;
 136         user_info->remote_host = talloc_steal(user_info, remote_address);
 137
 138         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 139         user_info->password.response.lanman = sess->old.in.password;
 140         user_info->password.response.lanman.data = talloc_steal(user_info, sess->old.in.password.data);
 141         user_info->password.response.nt = data_blob(NULL, 0);
 142
 143         auth_check_password_send(req->smb_conn->negotiate.auth_context, user_info,
 144                                  sesssetup_old_send, req);
 145         return;
 146
 147 nomem:
 148         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_NO_MEMORY);
 149 }
 150
 151 static void sesssetup_nt1_send(struct auth_check_password_request *areq,
 152                                void *private_data)
 153 {
 154         struct smbsrv_request *req = talloc_get_type(private_data, struct smbsrv_request);
 155         union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
 156         struct auth_serversupplied_info *server_info = NULL;
 157         struct auth_session_info *session_info;
 158         struct smbsrv_session *smb_sess;
 159         NTSTATUS status;
 160
 161         status = auth_check_password_recv(areq, req, &server_info);
 162         if (!NT_STATUS_IS_OK(status)) goto failed;
 163
 164         /* This references server_info into session_info */
 165         status = auth_generate_session_info(req, server_info, &session_info);
 166         if (!NT_STATUS_IS_OK(status)) goto failed;
 167
 168         /* allocate a new session */
 169         smb_sess = smbsrv_session_new(req->smb_conn, NULL);
 170         if (!smb_sess) {
 171                 status = NT_STATUS_INSUFFICIENT_RESOURCES;
 172                 goto failed;
 173         }
 174
 175         /* Ensure this is marked as a 'real' vuid, not one
 176          * simply valid for the session setup leg */
 177         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 178         if (!NT_STATUS_IS_OK(status)) goto failed;
 179
 180         /* To correctly process any AndX packet (like a tree connect)
 181          * we need to fill in the session on the request here */
 182         req->session = smb_sess;
 183         sess->nt1.out.vuid = smb_sess->vuid;
 184
 185         if (!session_info->server_info->authenticated) {
 186                 /* don't try signing as anonymous */
 187                 goto done;
 188         }
 189
 190         if (!smbsrv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
 191                 /* Already signing, or disabled */
 192                 goto done;
 193         }
 194
 195         /* Force check of the request packet, now we know the session key */
 196         smbsrv_signing_check_incoming(req);
 197 /* TODO: why don't we check the result here? */
 198
 199         /* Unfortunetly win2k3 as a client doesn't sign the request
 200          * packet here, so we have to force signing to start again */
 201
 202         smbsrv_signing_restart(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2);
 203
 204 done:
 205         status = NT_STATUS_OK;
 206 failed:
 207         status = auth_nt_status_squash(status);
 208         smbsrv_sesssetup_backend_send(req, sess, status);
 209 }
 210
 211 /*
 212   handler for NT1 style session setup
 213 */
 214 static void sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
 215 {
 216         NTSTATUS status;
 217         struct auth_context *auth_context;
 218         struct auth_usersupplied_info *user_info = NULL;
 219         struct socket_address *remote_address;
 220         const char *remote_machine = NULL;
 221
 222         sess->nt1.out.vuid = 0;
 223         sess->nt1.out.action = 0;
 224
 225         sesssetup_common_strings(req,
 226                                  &sess->nt1.out.os,
 227                                  &sess->nt1.out.lanman,
 228                                  &sess->nt1.out.domain);
 229
 230         if (!req->smb_conn->negotiate.done_sesssetup) {
 231                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 232                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 233         }
 234
 235         if (req->smb_conn->negotiate.oid) {
 236                 if (sess->nt1.in.user && *sess->nt1.in.user) {
 237                         /* We can't accept a normal login, because we
 238                          * don't have a challenge */
 239                         status = NT_STATUS_LOGON_FAILURE;
 240                         goto failed;
 241                 }
 242
 243                 /* TODO: should we use just "anonymous" here? */
 244                 status = auth_context_create(req, lp_auth_methods(),
 245                                              req->smb_conn->connection->event.ctx,
 246                                              req->smb_conn->connection->msg_ctx,
 247                                              &auth_context);
 248                 if (!NT_STATUS_IS_OK(status)) goto failed;
 249         } else {
 250                 auth_context = req->smb_conn->negotiate.auth_context;
 251         }
 252
 253         if (req->smb_conn->negotiate.calling_name) {
 254                 remote_machine = req->smb_conn->negotiate.calling_name->name;
 255         }
 256
 257         remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
 258         if (!remote_address) goto nomem;
 259
 260         if (!remote_machine) {
 261                 remote_machine = remote_address->addr;
 262         }
 263
 264         user_info = talloc(req, struct auth_usersupplied_info);
 265         if (!user_info) goto nomem;
 266
 267         user_info->mapped_state = False;
 268         user_info->logon_parameters = 0;
 269         user_info->flags = 0;
 270         user_info->client.account_name = sess->nt1.in.user;
 271         user_info->client.domain_name = sess->nt1.in.domain;
 272         user_info->workstation_name = remote_machine;
 273         user_info->remote_host = talloc_steal(user_info, remote_address);
 274
 275         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 276         user_info->password.response.lanman = sess->nt1.in.password1;
 277         user_info->password.response.lanman.data = talloc_steal(user_info, sess->nt1.in.password1.data);
 278         user_info->password.response.nt = sess->nt1.in.password2;
 279         user_info->password.response.nt.data = talloc_steal(user_info, sess->nt1.in.password2.data);
 280
 281         auth_check_password_send(auth_context, user_info,
 282                                  sesssetup_nt1_send, req);
 283         return;
 284
 285 nomem:
 286         status = NT_STATUS_NO_MEMORY;
 287 failed:
 288         status = auth_nt_status_squash(status);
 289         smbsrv_sesssetup_backend_send(req, sess, status);
 290 }
 291
 292 struct sesssetup_spnego_state {
 293         struct smbsrv_request *req;
 294         union smb_sesssetup *sess;
 295         struct smbsrv_session *smb_sess;
 296 };
 297
 298 static void sesssetup_spnego_send(struct gensec_update_request *greq, void *private_data)
 299 {
 300         struct sesssetup_spnego_state *s = talloc_get_type(private_data,
 301                                            struct sesssetup_spnego_state);
 302         struct smbsrv_request *req = s->req;
 303         union smb_sesssetup *sess = s->sess;
 304         struct smbsrv_session *smb_sess = s->smb_sess;
 305         struct auth_session_info *session_info = NULL;
 306         NTSTATUS status;
 307         NTSTATUS skey_status;
 308         DATA_BLOB session_key;
 309
 310         status = gensec_update_recv(greq, req, &sess->spnego.out.secblob);
 311         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 312                 goto done;
 313         } else if (!NT_STATUS_IS_OK(status)) {
 314                 goto failed;
 315         }
 316
 317         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
 318         if (!NT_STATUS_IS_OK(status)) goto failed;
 319
 320         skey_status = gensec_session_key(smb_sess->gensec_ctx, &session_key);
 321         if (NT_STATUS_IS_OK(skey_status) &&
 322             session_info->server_info->authenticated &&
 323             smbsrv_setup_signing(req->smb_conn, &session_key, NULL)) {
 324                 /* Force check of the request packet, now we know the session key */
 325                 smbsrv_signing_check_incoming(req);
 326
 327                 smbsrv_signing_restart(req->smb_conn, &session_key, NULL);
 328         }
 329
 330         /* Ensure this is marked as a 'real' vuid, not one
 331          * simply valid for the session setup leg */
 332         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 333         if (!NT_STATUS_IS_OK(status)) goto failed;
 334
 335         req->session = smb_sess;
 336
 337 done:
 338         sess->spnego.out.vuid = smb_sess->vuid;
 339 failed:
 340         status = auth_nt_status_squash(status);
 341         smbsrv_sesssetup_backend_send(req, sess, status);
 342 }
 343
 344 /*
 345   handler for SPNEGO style session setup
 346 */
 347 static void sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
 348 {
 349         NTSTATUS status;
 350         struct smbsrv_session *smb_sess = NULL;
 351         struct sesssetup_spnego_state *s = NULL;
 352         uint16_t vuid;
 353
 354         sess->spnego.out.vuid = 0;
 355         sess->spnego.out.action = 0;
 356
 357         sesssetup_common_strings(req,
 358                                  &sess->spnego.out.os,
 359                                  &sess->spnego.out.lanman,
 360                                  &sess->spnego.out.workgroup);
 361
 362         if (!req->smb_conn->negotiate.done_sesssetup) {
 363                 req->smb_conn->negotiate.max_send = sess->spnego.in.bufsize;
 364                 req->smb_conn->negotiate.client_caps = sess->spnego.in.capabilities;
 365         }
 366
 367         vuid = SVAL(req->in.hdr,HDR_UID);
 368
 369         /* lookup an existing session */
 370         smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
 371         if (!smb_sess) {
 372                 struct gensec_security *gensec_ctx;
 373
 374                 status = gensec_server_start(req,
 375                                              req->smb_conn->connection->event.ctx,
 376                                              req->smb_conn->connection->msg_ctx,
 377                                              &gensec_ctx);
 378                 if (!NT_STATUS_IS_OK(status)) {
 379                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 380                         goto failed;
 381                 }
 382
 383                 gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
 384
 385                 gensec_set_target_service(gensec_ctx, "cifs");
 386
 387                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 388
 389                 status = gensec_start_mech_by_oid(gensec_ctx, req->smb_conn->negotiate.oid);
 390                 if (!NT_STATUS_IS_OK(status)) {
 391                         DEBUG(1, ("Failed to start GENSEC %s server code: %s\n",
 392                                   gensec_get_name_by_oid(req->smb_conn->negotiate.oid), nt_errstr(status)));
 393                         goto failed;
 394                 }
 395
 396                 /* allocate a new session */
 397                 smb_sess = smbsrv_session_new(req->smb_conn, gensec_ctx);
 398                 if (!smb_sess) {
 399                         status = NT_STATUS_INSUFFICIENT_RESOURCES;
 400                         goto failed;
 401                 }
 402         }
 403
 404         if (!smb_sess) {
 405                 status = NT_STATUS_ACCESS_DENIED;
 406                 goto failed;
 407         }
 408
 409         if (!smb_sess->gensec_ctx) {
 410                 status = NT_STATUS_INTERNAL_ERROR;
 411                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
 412                 goto failed;
 413         }
 414
 415         s = talloc(req, struct sesssetup_spnego_state);
 416         if (!s) goto nomem;
 417         s->req          = req;
 418         s->sess         = sess;
 419         s->smb_sess     = smb_sess;
 420
 421         gensec_update_send(smb_sess->gensec_ctx, sess->spnego.in.secblob,
 422                            sesssetup_spnego_send, s);
 423         return;
 424
 425 nomem:
 426         status = NT_STATUS_NO_MEMORY;
 427 failed:
 428         talloc_free(smb_sess);
 429         status = auth_nt_status_squash(status);
 430         smbsrv_sesssetup_backend_send(req, sess, status);
 431 }
 432
 433 /*
 434   backend for sessionsetup call - this takes all 3 variants of the call
 435 */
 436 void smbsrv_sesssetup_backend(struct smbsrv_request *req,
 437                               union smb_sesssetup *sess)
 438 {
 439         switch (sess->old.level) {
 440                 case RAW_SESSSETUP_OLD:
 441                         sesssetup_old(req, sess);
 442                         return;
 443
 444                 case RAW_SESSSETUP_NT1:
 445                         sesssetup_nt1(req, sess);
 446                         return;
 447
 448                 case RAW_SESSSETUP_SPNEGO:
 449                         sesssetup_spnego(req, sess);
 450                         return;
 451
 452                 case RAW_SESSSETUP_SMB2:
 453                         break;
 454         }
 455
 456         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_INVALID_LEVEL);
 457 }