source4/librpc/rpc/dcerpc_util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    dcerpc utility functions
   5
   6    Copyright (C) Andrew Tridgell 2003
   7    Copyright (C) Jelmer Vernooij 2004
   8    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   9    Copyright (C) Rafal Szczesniak 2006
  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 "lib/events/events.h"
  27 #include "libcli/composite/composite.h"
  28 #include "librpc/gen_ndr/ndr_epmapper_c.h"
  29 #include "librpc/gen_ndr/ndr_dcerpc.h"
  30 #include "librpc/gen_ndr/ndr_misc.h"
  31 #include "librpc/rpc/dcerpc_proto.h"
  32 #include "auth/credentials/credentials.h"
  33 #include "auth/gensec/gensec.h"
  34 #include "param/param.h"
  35 #include "librpc/rpc/rpc_common.h"
  36
  37 /*
  38   find a dcerpc call on an interface by name
  39 */
  40 const struct ndr_interface_call *dcerpc_iface_find_call(const struct ndr_interface_table *iface,
  41                                                         const char *name)
  42 {
  43         int i;
  44         for (i=0;i<iface->num_calls;i++) {
  45                 if (strcmp(iface->calls[i].name, name) == 0) {
  46                         return &iface->calls[i];
  47                 }
  48         }
  49         return NULL;
  50 }
  51
  52 /*
  53    push a ncacn_packet into a blob, potentially with auth info
  54 */
  55 NTSTATUS ncacn_push_auth(DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
  56                          struct ncacn_packet *pkt,
  57                          struct dcerpc_auth *auth_info)
  58 {
  59         struct ndr_push *ndr;
  60         enum ndr_err_code ndr_err;
  61
  62         ndr = ndr_push_init_ctx(mem_ctx);
  63         if (!ndr) {
  64                 return NT_STATUS_NO_MEMORY;
  65         }
  66
  67         if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
  68                 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
  69         }
  70
  71         if (pkt->pfc_flags & DCERPC_PFC_FLAG_OBJECT_UUID) {
  72                 ndr->flags |= LIBNDR_FLAG_OBJECT_PRESENT;
  73         }
  74
  75         if (auth_info) {
  76                 pkt->auth_length = auth_info->credentials.length;
  77         } else {
  78                 pkt->auth_length = 0;
  79         }
  80
  81         ndr_err = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
  82         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  83                 return ndr_map_error2ntstatus(ndr_err);
  84         }
  85
  86         if (auth_info) {
  87 #if 0
  88                 /* the s3 rpc server doesn't handle auth padding in
  89                    bind requests. Use zero auth padding to keep us
  90                    working with old servers */
  91                 uint32_t offset = ndr->offset;
  92                 ndr_err = ndr_push_align(ndr, 16);
  93                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  94                         return ndr_map_error2ntstatus(ndr_err);
  95                 }
  96                 auth_info->auth_pad_length = ndr->offset - offset;
  97 #else
  98                 auth_info->auth_pad_length = 0;
  99 #endif
 100                 ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, auth_info);
 101                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 102                         return ndr_map_error2ntstatus(ndr_err);
 103                 }
 104         }
 105
 106         *blob = ndr_push_blob(ndr);
 107
 108         /* fill in the frag length */
 109         dcerpc_set_frag_length(blob, blob->length);
 110
 111         return NT_STATUS_OK;
 112 }
 113
 114
 115 struct epm_map_binding_state {
 116         struct dcerpc_binding *binding;
 117         const struct ndr_interface_table *table;
 118         struct dcerpc_pipe *pipe;
 119         struct policy_handle handle;
 120         struct GUID object;
 121         struct epm_twr_t twr;
 122         struct epm_twr_t *twr_r;
 123         uint32_t num_towers;
 124         struct epm_Map r;
 125 };
 126
 127
 128 static void continue_epm_recv_binding(struct composite_context *ctx);
 129 static void continue_epm_map(struct tevent_req *subreq);
 130
 131
 132 /*
 133   Stage 2 of epm_map_binding: Receive connected rpc pipe and send endpoint
 134   mapping rpc request
 135 */
 136 static void continue_epm_recv_binding(struct composite_context *ctx)
 137 {
 138         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 139                                                       struct composite_context);
 140         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
 141                                                           struct epm_map_binding_state);
 142         struct tevent_req *subreq;
 143
 144         /* receive result of rpc pipe connect request */
 145         c->status = dcerpc_pipe_connect_b_recv(ctx, c, &s->pipe);
 146         if (!composite_is_ok(c)) return;
 147
 148         c->status = dcerpc_binding_build_tower(s->pipe, s->binding, &s->twr.tower);
 149         if (!composite_is_ok(c)) return;
 150
 151         /* with some nice pretty paper around it of course */
 152         s->r.in.object        = &s->object;
 153         s->r.in.map_tower     = &s->twr;
 154         s->r.in.entry_handle  = &s->handle;
 155         s->r.in.max_towers    = 1;
 156         s->r.out.entry_handle = &s->handle;
 157         s->r.out.num_towers   = &s->num_towers;
 158
 159         /* send request for an endpoint mapping - a rpc request on connected pipe */
 160         subreq = dcerpc_epm_Map_r_send(s, c->event_ctx,
 161                                        s->pipe->binding_handle,
 162                                        &s->r);
 163         if (composite_nomem(subreq, c)) return;
 164
 165         tevent_req_set_callback(subreq, continue_epm_map, c);
 166 }
 167
 168
 169 /*
 170   Stage 3 of epm_map_binding: Receive endpoint mapping and provide binding details
 171 */
 172 static void continue_epm_map(struct tevent_req *subreq)
 173 {
 174         struct composite_context *c = tevent_req_callback_data(subreq,
 175                                       struct composite_context);
 176         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
 177                                                           struct epm_map_binding_state);
 178         const char *endpoint;
 179
 180         /* receive result of a rpc request */
 181         c->status = dcerpc_epm_Map_r_recv(subreq, s);
 182         TALLOC_FREE(subreq);
 183         if (!composite_is_ok(c)) return;
 184
 185         /* check the details */
 186         if (s->r.out.result != 0 || *s->r.out.num_towers != 1) {
 187                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 188                 return;
 189         }
 190
 191         s->twr_r = s->r.out.towers[0].twr;
 192         if (s->twr_r == NULL) {
 193                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 194                 return;
 195         }
 196
 197         if (s->twr_r->tower.num_floors != s->twr.tower.num_floors ||
 198             s->twr_r->tower.floors[3].lhs.protocol != s->twr.tower.floors[3].lhs.protocol) {
 199                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 200                 return;
 201         }
 202
 203         /* get received endpoint */
 204         endpoint = dcerpc_floor_get_rhs_data(s, &s->twr_r->tower.floors[3]);
 205         if (composite_nomem(endpoint, c)) return;
 206
 207         c->status = dcerpc_binding_set_string_option(s->binding,
 208                                                      "endpoint",
 209                                                      endpoint);
 210         if (!composite_is_ok(c)) {
 211                 return;
 212         }
 213
 214         composite_done(c);
 215 }
 216
 217
 218 /*
 219   Request for endpoint mapping of dcerpc binding - try to request for endpoint
 220   unless there is default one.
 221 */
 222 struct composite_context *dcerpc_epm_map_binding_send(TALLOC_CTX *mem_ctx,
 223                                                       struct dcerpc_binding *binding,
 224                                                       const struct ndr_interface_table *table,
 225                                                       struct cli_credentials *creds,
 226                                                       struct tevent_context *ev,
 227                                                       struct loadparm_context *lp_ctx)
 228 {
 229         struct composite_context *c;
 230         struct epm_map_binding_state *s;
 231         struct composite_context *pipe_connect_req;
 232         NTSTATUS status;
 233         struct dcerpc_binding *epmapper_binding;
 234         int i;
 235
 236         if (ev == NULL) {
 237                 return NULL;
 238         }
 239
 240         /* composite context allocation and setup */
 241         c = composite_create(mem_ctx, ev);
 242         if (c == NULL) {
 243                 return NULL;
 244         }
 245
 246         s = talloc_zero(c, struct epm_map_binding_state);
 247         if (composite_nomem(s, c)) return c;
 248         c->private_data = s;
 249
 250         s->binding = binding;
 251         s->object  = dcerpc_binding_get_object(binding);
 252         s->table   = table;
 253
 254         c->status = dcerpc_binding_set_abstract_syntax(binding,
 255                                                        &table->syntax_id);
 256         if (!composite_is_ok(c)) {
 257                 return c;
 258         }
 259
 260         /*
 261           First, check if there is a default endpoint specified in the IDL
 262         */
 263         for (i = 0; i < table->endpoints->count; i++) {
 264                 struct dcerpc_binding *default_binding;
 265                 enum dcerpc_transport_t transport;
 266                 enum dcerpc_transport_t dtransport;
 267                 const char *dendpoint = NULL;
 268
 269                 status = dcerpc_parse_binding(s,
 270                                               table->endpoints->names[i],
 271                                               &default_binding);
 272                 if (!NT_STATUS_IS_OK(status)) {
 273                         continue;
 274                 }
 275
 276                 transport = dcerpc_binding_get_transport(binding);
 277                 dtransport = dcerpc_binding_get_transport(default_binding);
 278                 if (transport == NCA_UNKNOWN) {
 279                         c->status = dcerpc_binding_set_transport(binding,
 280                                                                  dtransport);
 281                         if (!composite_is_ok(c)) {
 282                                 return c;
 283                         }
 284                         transport = dtransport;
 285                 }
 286
 287                 if (transport != dtransport) {
 288                         TALLOC_FREE(default_binding);
 289                         continue;
 290                 }
 291
 292                 dendpoint = dcerpc_binding_get_string_option(default_binding,
 293                                                              "endpoint");
 294                 if (dendpoint == NULL) {
 295                         TALLOC_FREE(default_binding);
 296                         continue;
 297                 }
 298
 299                 c->status = dcerpc_binding_set_string_option(binding,
 300                                                              "endpoint",
 301                                                              dendpoint);
 302                 if (!composite_is_ok(c)) {
 303                         return c;
 304                 }
 305
 306                 TALLOC_FREE(default_binding);
 307                 composite_done(c);
 308                 return c;
 309         }
 310
 311         epmapper_binding = dcerpc_binding_dup(s, binding);
 312         if (composite_nomem(epmapper_binding, c)) return c;
 313
 314         /* basic endpoint mapping data */
 315         c->status = dcerpc_binding_set_string_option(epmapper_binding,
 316                                                      "endpoint", NULL);
 317         if (!composite_is_ok(c)) {
 318                 return c;
 319         }
 320         c->status = dcerpc_binding_set_flags(epmapper_binding, 0, UINT32_MAX);
 321         if (!composite_is_ok(c)) {
 322                 return c;
 323         }
 324         c->status = dcerpc_binding_set_assoc_group_id(epmapper_binding, 0);
 325         if (!composite_is_ok(c)) {
 326                 return c;
 327         }
 328         c->status = dcerpc_binding_set_object(epmapper_binding, GUID_zero());
 329         if (!composite_is_ok(c)) {
 330                 return c;
 331         }
 332
 333         /* initiate rpc pipe connection */
 334         pipe_connect_req = dcerpc_pipe_connect_b_send(s, epmapper_binding,
 335                                                       &ndr_table_epmapper,
 336                                                       creds, c->event_ctx,
 337                                                       lp_ctx);
 338         if (composite_nomem(pipe_connect_req, c)) return c;
 339
 340         composite_continue(c, pipe_connect_req, continue_epm_recv_binding, c);
 341         return c;
 342 }
 343
 344
 345 /*
 346   Receive result of endpoint mapping request
 347  */
 348 NTSTATUS dcerpc_epm_map_binding_recv(struct composite_context *c)
 349 {
 350         NTSTATUS status = composite_wait(c);
 351
 352         talloc_free(c);
 353         return status;
 354 }
 355
 356
 357 /*
 358   Get endpoint mapping for rpc connection
 359 */
 360 _PUBLIC_ NTSTATUS dcerpc_epm_map_binding(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding,
 361                                 const struct ndr_interface_table *table, struct tevent_context *ev,
 362                                 struct loadparm_context *lp_ctx)
 363 {
 364         struct composite_context *c;
 365         struct cli_credentials *epm_creds;
 366
 367         epm_creds = cli_credentials_init_anon(mem_ctx);
 368         if (epm_creds == NULL) {
 369                 return NT_STATUS_NO_MEMORY;
 370         }
 371         c = dcerpc_epm_map_binding_send(mem_ctx, binding, table, epm_creds, ev, lp_ctx);
 372         if (c == NULL) {
 373                 talloc_free(epm_creds);
 374                 return NT_STATUS_NO_MEMORY;
 375         }
 376         talloc_steal(c, epm_creds);
 377         return dcerpc_epm_map_binding_recv(c);
 378 }
 379
 380
 381 struct pipe_auth_state {
 382         struct dcerpc_pipe *pipe;
 383         const struct dcerpc_binding *binding;
 384         const struct ndr_interface_table *table;
 385         struct loadparm_context *lp_ctx;
 386         struct cli_credentials *credentials;
 387         unsigned int logon_retries;
 388 };
 389
 390
 391 static void continue_auth_schannel(struct composite_context *ctx);
 392 static void continue_auth(struct composite_context *ctx);
 393 static void continue_auth_none(struct composite_context *ctx);
 394 static void continue_ntlmssp_connection(struct composite_context *ctx);
 395 static void continue_spnego_after_wrong_pass(struct composite_context *ctx);
 396
 397
 398 /*
 399   Stage 2 of pipe_auth: Receive result of schannel bind request
 400 */
 401 static void continue_auth_schannel(struct composite_context *ctx)
 402 {
 403         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 404                                                       struct composite_context);
 405
 406         c->status = dcerpc_bind_auth_schannel_recv(ctx);
 407         if (!composite_is_ok(c)) return;
 408
 409         composite_done(c);
 410 }
 411
 412
 413 /*
 414   Stage 2 of pipe_auth: Receive result of authenticated bind request
 415 */
 416 static void continue_auth(struct composite_context *ctx)
 417 {
 418         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 419                                                       struct composite_context);
 420
 421         c->status = dcerpc_bind_auth_recv(ctx);
 422         if (!composite_is_ok(c)) return;
 423
 424         composite_done(c);
 425 }
 426 /*
 427   Stage 2 of pipe_auth: Receive result of authenticated bind request, but handle fallbacks:
 428   SPNEGO -> NTLMSSP
 429 */
 430 static void continue_auth_auto(struct composite_context *ctx)
 431 {
 432         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 433                                                       struct composite_context);
 434         struct pipe_auth_state *s = talloc_get_type(c->private_data, struct pipe_auth_state);
 435         struct composite_context *sec_conn_req;
 436
 437         c->status = dcerpc_bind_auth_recv(ctx);
 438         if (NT_STATUS_EQUAL(c->status, NT_STATUS_INVALID_PARAMETER)) {
 439                 /*
 440                  * Retry with NTLMSSP auth as fallback
 441                  * send a request for secondary rpc connection
 442                  */
 443                 sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 444                                                                 s->binding);
 445                 composite_continue(c, sec_conn_req, continue_ntlmssp_connection, c);
 446                 return;
 447         } else if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE) ||
 448                    NT_STATUS_EQUAL(c->status, NT_STATUS_UNSUCCESSFUL)) {
 449                 /*
 450                   try a second time on any error. We don't just do it
 451                   on LOGON_FAILURE as some servers will give a
 452                   NT_STATUS_UNSUCCESSFUL on a authentication error on RPC
 453                  */
 454                 const char *principal;
 455                 const char *endpoint;
 456
 457                 principal = gensec_get_target_principal(s->pipe->conn->security_state.generic_state);
 458                 if (principal == NULL) {
 459                         const char *hostname = gensec_get_target_hostname(s->pipe->conn->security_state.generic_state);
 460                         const char *service  = gensec_get_target_service(s->pipe->conn->security_state.generic_state);
 461                         if (hostname != NULL && service != NULL) {
 462                                 principal = talloc_asprintf(c, "%s/%s", service, hostname);
 463                         }
 464                 }
 465
 466                 endpoint = dcerpc_binding_get_string_option(s->binding, "endpoint");
 467
 468                 if ((cli_credentials_failed_kerberos_login(s->credentials, principal, &s->logon_retries) ||
 469                      cli_credentials_wrong_password(s->credentials)) &&
 470                     endpoint != NULL) {
 471                         /*
 472                          * Retry SPNEGO with a better password
 473                          * send a request for secondary rpc connection
 474                          */
 475                         sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 476                                                                         s->binding);
 477                         composite_continue(c, sec_conn_req, continue_spnego_after_wrong_pass, c);
 478                         return;
 479                 }
 480         }
 481
 482         if (!composite_is_ok(c)) return;
 483
 484         composite_done(c);
 485 }
 486
 487 /*
 488   Stage 3 of pipe_auth (fallback to NTLMSSP case): Receive secondary
 489   rpc connection (the first one can't be used any more, due to the
 490   bind nak) and perform authenticated bind request
 491 */
 492 static void continue_ntlmssp_connection(struct composite_context *ctx)
 493 {
 494         struct composite_context *c;
 495         struct pipe_auth_state *s;
 496         struct composite_context *auth_req;
 497         struct dcerpc_pipe *p2;
 498         void *pp;
 499
 500         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 501         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 502
 503         /* receive secondary rpc connection */
 504         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 505         if (!composite_is_ok(c)) return;
 506
 507
 508         /* this is a rather strange situation. When
 509            we come into the routine, s is a child of s->pipe, and
 510            when we created p2 above, it also became a child of
 511            s->pipe.
 512
 513            Now we want p2 to be a parent of s->pipe, and we want s to
 514            be a parent of both of them! If we don't do this very
 515            carefully we end up creating a talloc loop
 516         */
 517
 518         /* we need the new contexts to hang off the same context
 519            that s->pipe is on, but the only way to get that is
 520            via talloc_parent() */
 521         pp = talloc_parent(s->pipe);
 522
 523         /* promote s to be at the top */
 524         talloc_steal(pp, s);
 525
 526         /* and put p2 under s */
 527         talloc_steal(s, p2);
 528
 529         /* now put s->pipe under p2 */
 530         talloc_steal(p2, s->pipe);
 531
 532         s->pipe = p2;
 533
 534         /* initiate a authenticated bind */
 535         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 536                                          s->credentials,
 537                                          lpcfg_gensec_settings(c, s->lp_ctx),
 538                                          DCERPC_AUTH_TYPE_NTLMSSP,
 539                                          dcerpc_auth_level(s->pipe->conn),
 540                                          s->table->authservices->names[0]);
 541         composite_continue(c, auth_req, continue_auth, c);
 542 }
 543
 544 /*
 545   Stage 3 of pipe_auth (retry on wrong password): Receive secondary
 546   rpc connection (the first one can't be used any more, due to the
 547   bind nak) and perform authenticated bind request
 548 */
 549 static void continue_spnego_after_wrong_pass(struct composite_context *ctx)
 550 {
 551         struct composite_context *c;
 552         struct pipe_auth_state *s;
 553         struct composite_context *auth_req;
 554         struct dcerpc_pipe *p2;
 555
 556         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 557         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 558
 559         /* receive secondary rpc connection */
 560         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 561         if (!composite_is_ok(c)) return;
 562
 563         talloc_steal(s, p2);
 564         talloc_steal(p2, s->pipe);
 565         s->pipe = p2;
 566
 567         /* initiate a authenticated bind */
 568         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 569                                          s->credentials,
 570                                          lpcfg_gensec_settings(c, s->lp_ctx),
 571                                          DCERPC_AUTH_TYPE_SPNEGO,
 572                                          dcerpc_auth_level(s->pipe->conn),
 573                                          s->table->authservices->names[0]);
 574         composite_continue(c, auth_req, continue_auth, c);
 575 }
 576
 577
 578 /*
 579   Stage 2 of pipe_auth: Receive result of non-authenticated bind request
 580 */
 581 static void continue_auth_none(struct composite_context *ctx)
 582 {
 583         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 584                                                       struct composite_context);
 585
 586         c->status = dcerpc_bind_auth_none_recv(ctx);
 587         if (!composite_is_ok(c)) return;
 588
 589         composite_done(c);
 590 }
 591
 592
 593 /*
 594   Request to perform an authenticated bind if required. Authentication
 595   is determined using credentials passed and binding flags.
 596 */
 597 struct composite_context *dcerpc_pipe_auth_send(struct dcerpc_pipe *p,
 598                                                 const struct dcerpc_binding *binding,
 599                                                 const struct ndr_interface_table *table,
 600                                                 struct cli_credentials *credentials,
 601                                                 struct loadparm_context *lp_ctx)
 602 {
 603         struct composite_context *c;
 604         struct pipe_auth_state *s;
 605         struct composite_context *auth_schannel_req;
 606         struct composite_context *auth_req;
 607         struct composite_context *auth_none_req;
 608         struct dcecli_connection *conn;
 609         uint8_t auth_type;
 610
 611         /* composite context allocation and setup */
 612         c = composite_create(p, p->conn->event_ctx);
 613         if (c == NULL) return NULL;
 614
 615         s = talloc_zero(c, struct pipe_auth_state);
 616         if (composite_nomem(s, c)) return c;
 617         c->private_data = s;
 618
 619         /* store parameters in state structure */
 620         s->binding      = binding;
 621         s->table        = table;
 622         s->credentials  = credentials;
 623         s->pipe         = p;
 624         s->lp_ctx       = lp_ctx;
 625
 626         conn = s->pipe->conn;
 627         conn->flags = dcerpc_binding_get_flags(binding);
 628
 629         if (DEBUGLVL(100)) {
 630                 conn->flags |= DCERPC_DEBUG_PRINT_BOTH;
 631         }
 632
 633         if (conn->transport.transport == NCALRPC) {
 634                 const char *v = dcerpc_binding_get_string_option(binding,
 635                                                         "auth_type");
 636
 637                 if (v != NULL && strcmp(v, "ncalrpc_as_system") == 0) {
 638                         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 639                                                  s->credentials,
 640                                                  lpcfg_gensec_settings(c, s->lp_ctx),
 641                                                  DCERPC_AUTH_TYPE_NCALRPC_AS_SYSTEM,
 642                                                  DCERPC_AUTH_LEVEL_CONNECT,
 643                                                  s->table->authservices->names[0]);
 644                         composite_continue(c, auth_req, continue_auth, c);
 645                         return c;
 646                 }
 647         }
 648
 649         if (cli_credentials_is_anonymous(s->credentials)) {
 650                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 651                 composite_continue(c, auth_none_req, continue_auth_none, c);
 652                 return c;
 653         }
 654
 655         if ((conn->flags & DCERPC_SCHANNEL) &&
 656             !cli_credentials_get_netlogon_creds(s->credentials)) {
 657                 /* If we don't already have netlogon credentials for
 658                  * the schannel bind, then we have to get these
 659                  * first */
 660                 auth_schannel_req = dcerpc_bind_auth_schannel_send(c, s->pipe, s->table,
 661                                                                    s->credentials, s->lp_ctx,
 662                                                                    dcerpc_auth_level(conn));
 663                 composite_continue(c, auth_schannel_req, continue_auth_schannel, c);
 664                 return c;
 665         }
 666
 667         /*
 668          * we rely on the already authenticated CIFS connection
 669          * if not doing sign or seal
 670          */
 671         if (conn->transport.transport == NCACN_NP &&
 672             !(conn->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 673                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 674                 composite_continue(c, auth_none_req, continue_auth_none, c);
 675                 return c;
 676         }
 677
 678
 679         /* Perform an authenticated DCE-RPC bind
 680          */
 681         if (!(conn->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 682                 /*
 683                   we are doing an authenticated connection,
 684                   but not using sign or seal. We must force
 685                   the CONNECT dcerpc auth type as a NONE auth
 686                   type doesn't allow authentication
 687                   information to be passed.
 688                 */
 689                 conn->flags |= DCERPC_CONNECT;
 690         }
 691
 692         if (conn->flags & DCERPC_AUTH_SPNEGO) {
 693                 auth_type = DCERPC_AUTH_TYPE_SPNEGO;
 694
 695         } else if (conn->flags & DCERPC_AUTH_KRB5) {
 696                 auth_type = DCERPC_AUTH_TYPE_KRB5;
 697
 698         } else if (conn->flags & DCERPC_SCHANNEL) {
 699                 auth_type = DCERPC_AUTH_TYPE_SCHANNEL;
 700
 701         } else if (conn->flags & DCERPC_AUTH_NTLM) {
 702                 auth_type = DCERPC_AUTH_TYPE_NTLMSSP;
 703
 704         } else {
 705                 /* try SPNEGO with fallback to NTLMSSP */
 706                 auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 707                                                  s->credentials,
 708                                                  lpcfg_gensec_settings(c, s->lp_ctx),
 709                                                  DCERPC_AUTH_TYPE_SPNEGO,
 710                                                  dcerpc_auth_level(conn),
 711                                                  s->table->authservices->names[0]);
 712                 composite_continue(c, auth_req, continue_auth_auto, c);
 713                 return c;
 714         }
 715
 716         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 717                                          s->credentials,
 718                                          lpcfg_gensec_settings(c, s->lp_ctx),
 719                                          auth_type,
 720                                          dcerpc_auth_level(conn),
 721                                          s->table->authservices->names[0]);
 722         composite_continue(c, auth_req, continue_auth, c);
 723         return c;
 724 }
 725
 726
 727 /*
 728   Receive result of authenticated bind request on dcerpc pipe
 729
 730   This returns *p, which may be different to the one originally
 731   supllied, as it rebinds to a new pipe due to authentication fallback
 732
 733 */
 734 NTSTATUS dcerpc_pipe_auth_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 735                                struct dcerpc_pipe **p)
 736 {
 737         NTSTATUS status;
 738
 739         struct pipe_auth_state *s = talloc_get_type(c->private_data,
 740                                                     struct pipe_auth_state);
 741         status = composite_wait(c);
 742         if (!NT_STATUS_IS_OK(status)) {
 743                 char *uuid_str = GUID_string(s->pipe, &s->table->syntax_id.uuid);
 744                 DEBUG(0, ("Failed to bind to uuid %s for %s %s\n", uuid_str,
 745                           dcerpc_binding_string(uuid_str, s->binding), nt_errstr(status)));
 746                 talloc_free(uuid_str);
 747         } else {
 748                 talloc_steal(mem_ctx, s->pipe);
 749                 *p = s->pipe;
 750         }
 751
 752         talloc_free(c);
 753         return status;
 754 }
 755
 756
 757 /*
 758    Perform an authenticated bind if needed - sync version
 759
 760    This may change *p, as it rebinds to a new pipe due to authentication fallback
 761 */
 762 _PUBLIC_ NTSTATUS dcerpc_pipe_auth(TALLOC_CTX *mem_ctx,
 763                           struct dcerpc_pipe **p,
 764                           const struct dcerpc_binding *binding,
 765                           const struct ndr_interface_table *table,
 766                           struct cli_credentials *credentials,
 767                           struct loadparm_context *lp_ctx)
 768 {
 769         struct composite_context *c;
 770
 771         c = dcerpc_pipe_auth_send(*p, binding, table, credentials, lp_ctx);
 772         return dcerpc_pipe_auth_recv(c, mem_ctx, p);
 773 }
 774
 775
 776 NTSTATUS dcerpc_generic_session_key(struct dcecli_connection *c,
 777                                     DATA_BLOB *session_key)
 778 {
 779         /* this took quite a few CPU cycles to find ... */
 780         session_key->data = discard_const_p(unsigned char, "SystemLibraryDTC");
 781         session_key->length = 16;
 782         return NT_STATUS_OK;
 783 }
 784
 785 /*
 786   fetch the user session key - may be default (above) or the SMB session key
 787
 788   The key is always truncated to 16 bytes
 789 */
 790 _PUBLIC_ NTSTATUS dcerpc_fetch_session_key(struct dcerpc_pipe *p,
 791                                            DATA_BLOB *session_key)
 792 {
 793         NTSTATUS status;
 794         status = p->conn->security_state.session_key(p->conn, session_key);
 795         if (!NT_STATUS_IS_OK(status)) {
 796                 return status;
 797         }
 798
 799         session_key->length = MIN(session_key->length, 16);
 800
 801         return NT_STATUS_OK;
 802 }
 803
 804
 805 /*
 806   log a rpc packet in a format suitable for ndrdump. This is especially useful
 807   for sealed packets, where ethereal cannot easily see the contents
 808
 809   this triggers on a debug level of >= 10
 810 */
 811 _PUBLIC_ void dcerpc_log_packet(const char *lockdir,
 812                                 const struct ndr_interface_table *ndr,
 813                                 uint32_t opnum, uint32_t flags,
 814                                 const DATA_BLOB *pkt)
 815 {
 816         const int num_examples = 20;
 817         int i;
 818
 819         if (lockdir == NULL) return;
 820
 821         for (i=0;i<num_examples;i++) {
 822                 char *name=NULL;
 823                 int ret;
 824                 ret = asprintf(&name, "%s/rpclog/%s-%u.%d.%s",
 825                                lockdir, ndr->name, opnum, i,
 826                                (flags&NDR_IN)?"in":"out");
 827                 if (ret == -1) {
 828                         return;
 829                 }
 830                 if (!file_exist(name)) {
 831                         if (file_save(name, pkt->data, pkt->length)) {
 832                                 DEBUG(10,("Logged rpc packet to %s\n", name));
 833                         }
 834                         free(name);
 835                         break;
 836                 }
 837                 free(name);
 838         }
 839 }
 840
 841
 842
 843 /*
 844   create a secondary context from a primary connection
 845
 846   this uses dcerpc_alter_context() to create a new dcerpc context_id
 847 */
 848 _PUBLIC_ NTSTATUS dcerpc_secondary_context(struct dcerpc_pipe *p,
 849                                   struct dcerpc_pipe **pp2,
 850                                   const struct ndr_interface_table *table)
 851 {
 852         NTSTATUS status;
 853         struct dcerpc_pipe *p2;
 854
 855         p2 = talloc_zero(p, struct dcerpc_pipe);
 856         if (p2 == NULL) {
 857                 return NT_STATUS_NO_MEMORY;
 858         }
 859         p2->conn = talloc_reference(p2, p->conn);
 860         p2->request_timeout = p->request_timeout;
 861
 862         p2->context_id = ++p->conn->next_context_id;
 863
 864         p2->syntax = table->syntax_id;
 865
 866         p2->transfer_syntax = p->transfer_syntax;
 867
 868         p2->binding = dcerpc_binding_dup(p2, p->binding);
 869         if (p2->binding == NULL) {
 870                 talloc_free(p2);
 871                 return NT_STATUS_NO_MEMORY;
 872         }
 873
 874         p2->binding_handle = dcerpc_pipe_binding_handle(p2);
 875         if (p2->binding_handle == NULL) {
 876                 talloc_free(p2);
 877                 return NT_STATUS_NO_MEMORY;
 878         }
 879
 880         status = dcerpc_alter_context(p2, p2, &p2->syntax, &p2->transfer_syntax);
 881         if (!NT_STATUS_IS_OK(status)) {
 882                 talloc_free(p2);
 883                 return status;
 884         }
 885
 886         *pp2 = p2;
 887
 888         return NT_STATUS_OK;
 889 }