source/libcli/smb_composite/sesssetup.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Andrew Tridgell 2005
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20 /*
  21   a composite API for making handling a generic async session setup
  22 */
  23
  24 #include "includes.h"
  25 #include "libcli/raw/libcliraw.h"
  26 #include "libcli/composite/composite.h"
  27 #include "libcli/smb_composite/smb_composite.h"
  28 #include "libcli/auth/libcli_auth.h"
  29 #include "auth/auth.h"
  30 #include "version.h"
  31
  32 struct sesssetup_state {
  33         union smb_sesssetup setup;
  34         NTSTATUS gensec_status;
  35         struct smb_composite_sesssetup *io;
  36         struct smbcli_request *req;
  37 };
  38
  39 static NTSTATUS session_setup_old(struct composite_context *c,
  40                                   struct smbcli_session *session,
  41                                   struct smb_composite_sesssetup *io,
  42                                   struct smbcli_request **req);
  43 static NTSTATUS session_setup_nt1(struct composite_context *c,
  44                                   struct smbcli_session *session,
  45                                   struct smb_composite_sesssetup *io,
  46                                   struct smbcli_request **req);
  47 static NTSTATUS session_setup_spnego(struct composite_context *c,
  48                                      struct smbcli_session *session,
  49                                      struct smb_composite_sesssetup *io,
  50                                      struct smbcli_request **req);
  51
  52 /*
  53   store the user session key for a transport
  54 */
  55 static void set_user_session_key(struct smbcli_session *session,
  56                                  const DATA_BLOB *session_key)
  57 {
  58         session->user_session_key = data_blob_talloc(session,
  59                                                      session_key->data,
  60                                                      session_key->length);
  61 }
  62
  63 /*
  64   handler for completion of a smbcli_request sub-request
  65 */
  66 static void request_handler(struct smbcli_request *req)
  67 {
  68         struct composite_context *c = req->async.private;
  69         struct sesssetup_state *state = talloc_get_type(c->private_data, struct sesssetup_state);
  70         struct smbcli_session *session = req->session;
  71         DATA_BLOB session_key = data_blob(NULL, 0);
  72         DATA_BLOB null_data_blob = data_blob(NULL, 0);
  73         NTSTATUS session_key_err, nt_status;
  74
  75         c->status = smb_raw_sesssetup_recv(req, state, &state->setup);
  76
  77         switch (state->setup.old.level) {
  78         case RAW_SESSSETUP_OLD:
  79                 state->io->out.vuid = state->setup.old.out.vuid;
  80                 /* This doesn't work, as this only happens on old
  81                  * protocols, where this comparison won't match. */
  82                 if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
  83                         if (cli_credentials_wrong_password(state->io->in.credentials)) {
  84                                 nt_status = session_setup_old(c, session,
  85                                                               state->io,
  86                                                               &state->req);
  87                                 if (NT_STATUS_IS_OK(nt_status)) {
  88                                         c->status = nt_status;
  89                                         state->req->async.fn = request_handler;
  90                                         state->req->async.private = c;
  91                                         return;
  92                                 }
  93                         }
  94                 }
  95                 break;
  96
  97         case RAW_SESSSETUP_NT1:
  98                 state->io->out.vuid = state->setup.nt1.out.vuid;
  99                 if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
 100                         if (cli_credentials_wrong_password(state->io->in.credentials)) {
 101                                 nt_status = session_setup_nt1(c, session,
 102                                                               state->io,
 103                                                               &state->req);
 104                                 if (NT_STATUS_IS_OK(nt_status)) {
 105                                         c->status = nt_status;
 106                                         state->req->async.fn = request_handler;
 107                                         state->req->async.private = c;
 108                                         return;
 109                                 }
 110                         }
 111                 }
 112                 break;
 113
 114         case RAW_SESSSETUP_SPNEGO:
 115                 session->vuid = state->io->out.vuid = state->setup.spnego.out.vuid;
 116                 if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
 117                         if (cli_credentials_wrong_password(state->io->in.credentials)) {
 118                                 nt_status = session_setup_spnego(c, session,
 119                                                                       state->io,
 120                                                                       &state->req);
 121                                 if (NT_STATUS_IS_OK(nt_status)) {
 122                                         c->status = nt_status;
 123                                         state->req->async.fn = request_handler;
 124                                         state->req->async.private = c;
 125                                         return;
 126                                 }
 127                         }
 128                 }
 129                 if (!NT_STATUS_EQUAL(c->status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
 130                     !NT_STATUS_IS_OK(c->status)) {
 131                         break;
 132                 }
 133                 if (NT_STATUS_EQUAL(state->gensec_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 134
 135                         /* The status value here, from the earlier pass at GENSEC is
 136                          * vital to the security of the system.  Even if the other end
 137                          * accepts, if GENSEC claims 'MORE_PROCESSING_REQUIRED' then
 138                          * you must keep feeding it blobs, or else the remote
 139                          * host/attacker might avoid mutal authentication
 140                          * requirements */
 141
 142                         state->gensec_status = gensec_update(session->gensec, state,
 143                                                          state->setup.spnego.out.secblob,
 144                                                          &state->setup.spnego.in.secblob);
 145                         c->status = state->gensec_status;
 146                         if (!NT_STATUS_EQUAL(c->status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
 147                             !NT_STATUS_IS_OK(c->status)) {
 148                                 break;
 149                         }
 150                 } else {
 151                         state->setup.spnego.in.secblob = data_blob(NULL, 0);
 152                 }
 153
 154                 /* we need to do another round of session setup. We keep going until both sides
 155                    are happy */
 156                 session_key_err = gensec_session_key(session->gensec, &session_key);
 157                 if (NT_STATUS_IS_OK(session_key_err)) {
 158                         set_user_session_key(session, &session_key);
 159                         smbcli_transport_simple_set_signing(session->transport, session_key, null_data_blob);
 160                 }
 161
 162                 if (state->setup.spnego.in.secblob.length) {
 163                         state->req = smb_raw_sesssetup_send(session, &state->setup);
 164                         state->req->async.fn = request_handler;
 165                         state->req->async.private = c;
 166                         return;
 167                 }
 168         }
 169
 170         /* enforce the local signing required flag */
 171         if (NT_STATUS_IS_OK(c->status) && !cli_credentials_is_anonymous(state->io->in.credentials)) {
 172                 if (!session->transport->negotiate.sign_info.doing_signing
 173                     && session->transport->negotiate.sign_info.mandatory_signing) {
 174                         DEBUG(0, ("SMB signing required, but server does not support it\n"));
 175                         c->status = NT_STATUS_ACCESS_DENIED;
 176                 }
 177         }
 178
 179         if (NT_STATUS_IS_OK(c->status)) {
 180                 c->state = COMPOSITE_STATE_DONE;
 181         } else {
 182                 c->state = COMPOSITE_STATE_ERROR;
 183         }
 184         if (c->async.fn) {
 185                 c->async.fn(c);
 186         }
 187 }
 188
 189
 190 /*
 191   send a nt1 style session setup
 192 */
 193 static NTSTATUS session_setup_nt1(struct composite_context *c,
 194                                   struct smbcli_session *session,
 195                                   struct smb_composite_sesssetup *io,
 196                                   struct smbcli_request **req)
 197 {
 198         NTSTATUS nt_status;
 199         struct sesssetup_state *state = talloc_get_type(c->private_data, struct sesssetup_state);
 200         const char *password = cli_credentials_get_password(io->in.credentials);
 201         DATA_BLOB names_blob = NTLMv2_generate_names_blob(state, session->transport->socket->hostname, lp_workgroup());
 202         DATA_BLOB session_key;
 203         int flags = CLI_CRED_NTLM_AUTH;
 204         if (lp_client_lanman_auth()) {
 205                 flags |= CLI_CRED_LANMAN_AUTH;
 206         }
 207
 208         if (lp_client_ntlmv2_auth()) {
 209                 flags |= CLI_CRED_NTLMv2_AUTH;
 210         }
 211
 212         state->setup.nt1.level           = RAW_SESSSETUP_NT1;
 213         state->setup.nt1.in.bufsize      = session->transport->options.max_xmit;
 214         state->setup.nt1.in.mpx_max      = session->transport->options.max_mux;
 215         state->setup.nt1.in.vc_num       = 1;
 216         state->setup.nt1.in.sesskey      = io->in.sesskey;
 217         state->setup.nt1.in.capabilities = io->in.capabilities;
 218         state->setup.nt1.in.os           = "Unix";
 219         state->setup.nt1.in.lanman       = talloc_asprintf(state, "Samba %s", SAMBA_VERSION_STRING);
 220
 221         cli_credentials_get_ntlm_username_domain(io->in.credentials, state,
 222                                                  &state->setup.nt1.in.user,
 223                                                  &state->setup.nt1.in.domain);
 224
 225
 226         if (session->transport->negotiate.sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) {
 227                 nt_status = cli_credentials_get_ntlm_response(io->in.credentials, state,
 228                                                               &flags,
 229                                                               session->transport->negotiate.secblob,
 230                                                               names_blob,
 231                                                               &state->setup.nt1.in.password1,
 232                                                               &state->setup.nt1.in.password2,
 233                                                               NULL, &session_key);
 234                 NT_STATUS_NOT_OK_RETURN(nt_status);
 235
 236                 smbcli_transport_simple_set_signing(session->transport, session_key,
 237                                                     state->setup.nt1.in.password2);
 238                 set_user_session_key(session, &session_key);
 239
 240                 data_blob_free(&session_key);
 241         } else if (lp_client_plaintext_auth()) {
 242                 state->setup.nt1.in.password1 = data_blob_talloc(state, password, strlen(password));
 243                 state->setup.nt1.in.password2 = data_blob(NULL, 0);
 244         } else {
 245                 /* could match windows client and return 'cannot logon from this workstation', but it just confuses everybody */
 246                 return NT_STATUS_INVALID_PARAMETER;
 247         }
 248
 249         *req = smb_raw_sesssetup_send(session, &state->setup);
 250         if (!*req) {
 251                 return NT_STATUS_NO_MEMORY;
 252         }
 253         return (*req)->status;
 254 }
 255
 256
 257 /*
 258   old style session setup (pre NT1 protocol level)
 259 */
 260 static NTSTATUS session_setup_old(struct composite_context *c,
 261                                   struct smbcli_session *session,
 262                                   struct smb_composite_sesssetup *io,
 263                                   struct smbcli_request **req)
 264 {
 265         NTSTATUS nt_status;
 266         struct sesssetup_state *state = talloc_get_type(c->private_data, struct sesssetup_state);
 267         const char *password = cli_credentials_get_password(io->in.credentials);
 268         DATA_BLOB names_blob = NTLMv2_generate_names_blob(state, session->transport->socket->hostname, lp_workgroup());
 269         DATA_BLOB session_key;
 270         int flags = 0;
 271         if (lp_client_lanman_auth()) {
 272                 flags |= CLI_CRED_LANMAN_AUTH;
 273         }
 274
 275         if (lp_client_ntlmv2_auth()) {
 276                 flags |= CLI_CRED_NTLMv2_AUTH;
 277         }
 278
 279         state->setup.old.level      = RAW_SESSSETUP_OLD;
 280         state->setup.old.in.bufsize = session->transport->options.max_xmit;
 281         state->setup.old.in.mpx_max = session->transport->options.max_mux;
 282         state->setup.old.in.vc_num  = 1;
 283         state->setup.old.in.sesskey = io->in.sesskey;
 284         state->setup.old.in.os      = "Unix";
 285         state->setup.old.in.lanman  = talloc_asprintf(state, "Samba %s", SAMBA_VERSION_STRING);
 286         cli_credentials_get_ntlm_username_domain(io->in.credentials, state,
 287                                                  &state->setup.old.in.user,
 288                                                  &state->setup.old.in.domain);
 289
 290         if (session->transport->negotiate.sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) {
 291                 nt_status = cli_credentials_get_ntlm_response(io->in.credentials, state,
 292                                                               &flags,
 293                                                               session->transport->negotiate.secblob,
 294                                                               names_blob,
 295                                                               &state->setup.old.in.password,
 296                                                               NULL,
 297                                                               NULL, &session_key);
 298                 NT_STATUS_NOT_OK_RETURN(nt_status);
 299                 set_user_session_key(session, &session_key);
 300
 301                 data_blob_free(&session_key);
 302         } else if (lp_client_plaintext_auth()) {
 303                 state->setup.old.in.password = data_blob_talloc(state, password, strlen(password));
 304         } else {
 305                 /* could match windows client and return 'cannot logon from this workstation', but it just confuses everybody */
 306                 return NT_STATUS_INVALID_PARAMETER;
 307         }
 308
 309         *req = smb_raw_sesssetup_send(session, &state->setup);
 310         if (!*req) {
 311                 return NT_STATUS_NO_MEMORY;
 312         }
 313         return (*req)->status;
 314 }
 315
 316
 317 /*
 318   Modern, all singing, all dancing extended security (and possibly SPNEGO) request
 319 */
 320 static NTSTATUS session_setup_spnego(struct composite_context *c,
 321                                      struct smbcli_session *session,
 322                                      struct smb_composite_sesssetup *io,
 323                                      struct smbcli_request **req)
 324 {
 325         struct sesssetup_state *state = talloc_get_type(c->private_data, struct sesssetup_state);
 326         NTSTATUS status, session_key_err;
 327         DATA_BLOB session_key = data_blob(NULL, 0);
 328         DATA_BLOB null_data_blob = data_blob(NULL, 0);
 329         const char *chosen_oid = NULL;
 330
 331         state->setup.spnego.level           = RAW_SESSSETUP_SPNEGO;
 332         state->setup.spnego.in.bufsize      = session->transport->options.max_xmit;
 333         state->setup.spnego.in.mpx_max      = session->transport->options.max_mux;
 334         state->setup.spnego.in.vc_num       = 1;
 335         state->setup.spnego.in.sesskey      = io->in.sesskey;
 336         state->setup.spnego.in.capabilities = io->in.capabilities;
 337         state->setup.spnego.in.os           = "Unix";
 338         state->setup.spnego.in.lanman       = talloc_asprintf(state, "Samba %s", SAMBA_VERSION_STRING);
 339         state->setup.spnego.in.workgroup    = io->in.workgroup;
 340
 341         state->setup.spnego.out.vuid        = session->vuid;
 342
 343         smbcli_temp_set_signing(session->transport);
 344
 345         status = gensec_client_start(session, &session->gensec, c->event_ctx);
 346         if (!NT_STATUS_IS_OK(status)) {
 347                 DEBUG(1, ("Failed to start GENSEC client mode: %s\n", nt_errstr(status)));
 348                 return status;
 349         }
 350
 351         gensec_want_feature(session->gensec, GENSEC_FEATURE_SESSION_KEY);
 352
 353         status = gensec_set_credentials(session->gensec, io->in.credentials);
 354         if (!NT_STATUS_IS_OK(status)) {
 355                 DEBUG(1, ("Failed to start set GENSEC client credentails: %s\n",
 356                           nt_errstr(status)));
 357                 return status;
 358         }
 359
 360         status = gensec_set_target_hostname(session->gensec, session->transport->socket->hostname);
 361         if (!NT_STATUS_IS_OK(status)) {
 362                 DEBUG(1, ("Failed to start set GENSEC target hostname: %s\n",
 363                           nt_errstr(status)));
 364                 return status;
 365         }
 366
 367         status = gensec_set_target_service(session->gensec, "cifs");
 368         if (!NT_STATUS_IS_OK(status)) {
 369                 DEBUG(1, ("Failed to start set GENSEC target service: %s\n",
 370                           nt_errstr(status)));
 371                 return status;
 372         }
 373
 374         if (session->transport->negotiate.secblob.length) {
 375                 chosen_oid = GENSEC_OID_SPNEGO;
 376                 status = gensec_start_mech_by_oid(session->gensec, chosen_oid);
 377                 if (!NT_STATUS_IS_OK(status)) {
 378                         DEBUG(1, ("Failed to start set GENSEC client mechanism %s: %s\n",
 379                                   gensec_get_name_by_oid(chosen_oid), nt_errstr(status)));
 380                         chosen_oid = GENSEC_OID_NTLMSSP;
 381                         status = gensec_start_mech_by_oid(session->gensec, chosen_oid);
 382                         if (!NT_STATUS_IS_OK(status)) {
 383                                 DEBUG(1, ("Failed to start set (fallback) GENSEC client mechanism %s: %s\n",
 384                                           gensec_get_name_by_oid(chosen_oid), nt_errstr(status)));
 385                         return status;
 386                         }
 387                 }
 388         } else {
 389                 /* without a sec blob, means raw NTLMSSP */
 390                 chosen_oid = GENSEC_OID_NTLMSSP;
 391                 status = gensec_start_mech_by_oid(session->gensec, chosen_oid);
 392                 if (!NT_STATUS_IS_OK(status)) {
 393                         DEBUG(1, ("Failed to start set GENSEC client mechanism %s: %s\n",
 394                                   gensec_get_name_by_oid(chosen_oid), nt_errstr(status)));
 395                 }
 396         }
 397
 398         if (chosen_oid == GENSEC_OID_SPNEGO) {
 399                 status = gensec_update(session->gensec, state,
 400                                        session->transport->negotiate.secblob,
 401                                        &state->setup.spnego.in.secblob);
 402         } else {
 403                 status = gensec_update(session->gensec, state,
 404                                        data_blob(NULL, 0),
 405                                        &state->setup.spnego.in.secblob);
 406
 407         }
 408
 409         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
 410             !NT_STATUS_IS_OK(status)) {
 411                 DEBUG(1, ("Failed initial gensec_update with mechanism %s: %s\n",
 412                           gensec_get_name_by_oid(chosen_oid), nt_errstr(status)));
 413                 return status;
 414         }
 415         state->gensec_status = status;
 416
 417         session_key_err = gensec_session_key(session->gensec, &session_key);
 418         if (NT_STATUS_IS_OK(session_key_err)) {
 419                 smbcli_transport_simple_set_signing(session->transport, session_key, null_data_blob);
 420         }
 421
 422         *req = smb_raw_sesssetup_send(session, &state->setup);
 423         if (!*req) {
 424                 return NT_STATUS_NO_MEMORY;
 425         }
 426         return (*req)->status;
 427 }
 428
 429
 430 /*
 431   composite session setup function that hides the details of all the
 432   different session setup varients, including the multi-pass nature of
 433   the spnego varient
 434 */
 435 struct composite_context *smb_composite_sesssetup_send(struct smbcli_session *session,
 436                                                        struct smb_composite_sesssetup *io)
 437 {
 438         struct composite_context *c;
 439         struct sesssetup_state *state;
 440         NTSTATUS status;
 441
 442         c = talloc_zero(session, struct composite_context);
 443         if (c == NULL) return NULL;
 444
 445         state = talloc(c, struct sesssetup_state);
 446         if (state == NULL) {
 447                 talloc_free(c);
 448                 return NULL;
 449         }
 450
 451         state->io = io;
 452
 453         c->state = COMPOSITE_STATE_IN_PROGRESS;
 454         c->private_data = state;
 455         c->event_ctx = session->transport->socket->event.ctx;
 456
 457         /* no session setup at all in earliest protocol varients */
 458         if (session->transport->negotiate.protocol < PROTOCOL_LANMAN1) {
 459                 ZERO_STRUCT(io->out);
 460                 c->state = COMPOSITE_STATE_DONE;
 461                 return c;
 462         }
 463
 464         /* see what session setup interface we will use */
 465         if (session->transport->negotiate.protocol < PROTOCOL_NT1) {
 466                 status = session_setup_old(c, session, io, &state->req);
 467         } else if (!session->transport->options.use_spnego ||
 468                    !(io->in.capabilities & CAP_EXTENDED_SECURITY)) {
 469                 status = session_setup_nt1(c, session, io, &state->req);
 470         } else {
 471                 status = session_setup_spnego(c, session, io, &state->req);
 472         }
 473
 474         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) ||
 475             NT_STATUS_IS_OK(status)) {
 476                 state->req->async.fn = request_handler;
 477                 state->req->async.private = c;
 478                 return c;
 479         }
 480
 481         c->state = COMPOSITE_STATE_ERROR;
 482         c->status = status;
 483         return c;
 484 }
 485
 486
 487 /*
 488   receive a composite session setup reply
 489 */
 490 NTSTATUS smb_composite_sesssetup_recv(struct composite_context *c)
 491 {
 492         NTSTATUS status;
 493         status = composite_wait(c);
 494         talloc_free(c);
 495         return status;
 496 }
 497
 498 /*
 499   sync version of smb_composite_sesssetup
 500 */
 501 NTSTATUS smb_composite_sesssetup(struct smbcli_session *session, struct smb_composite_sesssetup *io)
 502 {
 503         struct composite_context *c = smb_composite_sesssetup_send(session, io);
 504         return smb_composite_sesssetup_recv(c);
 505 }