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 tevent_context *ev,
 226                                                       struct loadparm_context *lp_ctx)
 227 {
 228         struct composite_context *c;
 229         struct epm_map_binding_state *s;
 230         struct composite_context *pipe_connect_req;
 231         struct cli_credentials *anon_creds;
 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         /* anonymous credentials for rpc connection used to get endpoint mapping */
 312         anon_creds = cli_credentials_init_anon(s);
 313         if (composite_nomem(anon_creds, c)) return c;
 314
 315         epmapper_binding = dcerpc_binding_dup(s, binding);
 316         if (composite_nomem(epmapper_binding, c)) return c;
 317
 318         /* basic endpoint mapping data */
 319         c->status = dcerpc_binding_set_string_option(epmapper_binding,
 320                                                      "endpoint", NULL);
 321         if (!composite_is_ok(c)) {
 322                 return c;
 323         }
 324         c->status = dcerpc_binding_set_flags(epmapper_binding, 0, UINT32_MAX);
 325         if (!composite_is_ok(c)) {
 326                 return c;
 327         }
 328         c->status = dcerpc_binding_set_assoc_group_id(epmapper_binding, 0);
 329         if (!composite_is_ok(c)) {
 330                 return c;
 331         }
 332         c->status = dcerpc_binding_set_object(epmapper_binding, GUID_zero());
 333         if (!composite_is_ok(c)) {
 334                 return c;
 335         }
 336
 337         /* initiate rpc pipe connection */
 338         pipe_connect_req = dcerpc_pipe_connect_b_send(s, epmapper_binding,
 339                                                       &ndr_table_epmapper,
 340                                                       anon_creds, c->event_ctx,
 341                                                       lp_ctx);
 342         if (composite_nomem(pipe_connect_req, c)) return c;
 343
 344         composite_continue(c, pipe_connect_req, continue_epm_recv_binding, c);
 345         return c;
 346 }
 347
 348
 349 /*
 350   Receive result of endpoint mapping request
 351  */
 352 NTSTATUS dcerpc_epm_map_binding_recv(struct composite_context *c)
 353 {
 354         NTSTATUS status = composite_wait(c);
 355
 356         talloc_free(c);
 357         return status;
 358 }
 359
 360
 361 /*
 362   Get endpoint mapping for rpc connection
 363 */
 364 _PUBLIC_ NTSTATUS dcerpc_epm_map_binding(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding,
 365                                 const struct ndr_interface_table *table, struct tevent_context *ev,
 366                                 struct loadparm_context *lp_ctx)
 367 {
 368         struct composite_context *c;
 369
 370         c = dcerpc_epm_map_binding_send(mem_ctx, binding, table, ev, lp_ctx);
 371         return dcerpc_epm_map_binding_recv(c);
 372 }
 373
 374
 375 struct pipe_auth_state {
 376         struct dcerpc_pipe *pipe;
 377         const struct dcerpc_binding *binding;
 378         const struct ndr_interface_table *table;
 379         struct loadparm_context *lp_ctx;
 380         struct cli_credentials *credentials;
 381         unsigned int logon_retries;
 382 };
 383
 384
 385 static void continue_auth_schannel(struct composite_context *ctx);
 386 static void continue_auth(struct composite_context *ctx);
 387 static void continue_auth_none(struct composite_context *ctx);
 388 static void continue_ntlmssp_connection(struct composite_context *ctx);
 389 static void continue_spnego_after_wrong_pass(struct composite_context *ctx);
 390
 391
 392 /*
 393   Stage 2 of pipe_auth: Receive result of schannel bind request
 394 */
 395 static void continue_auth_schannel(struct composite_context *ctx)
 396 {
 397         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 398                                                       struct composite_context);
 399
 400         c->status = dcerpc_bind_auth_schannel_recv(ctx);
 401         if (!composite_is_ok(c)) return;
 402
 403         composite_done(c);
 404 }
 405
 406
 407 /*
 408   Stage 2 of pipe_auth: Receive result of authenticated bind request
 409 */
 410 static void continue_auth(struct composite_context *ctx)
 411 {
 412         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 413                                                       struct composite_context);
 414
 415         c->status = dcerpc_bind_auth_recv(ctx);
 416         if (!composite_is_ok(c)) return;
 417
 418         composite_done(c);
 419 }
 420 /*
 421   Stage 2 of pipe_auth: Receive result of authenticated bind request, but handle fallbacks:
 422   SPNEGO -> NTLMSSP
 423 */
 424 static void continue_auth_auto(struct composite_context *ctx)
 425 {
 426         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 427                                                       struct composite_context);
 428         struct pipe_auth_state *s = talloc_get_type(c->private_data, struct pipe_auth_state);
 429         struct composite_context *sec_conn_req;
 430
 431         c->status = dcerpc_bind_auth_recv(ctx);
 432         if (NT_STATUS_EQUAL(c->status, NT_STATUS_INVALID_PARAMETER)) {
 433                 /*
 434                  * Retry with NTLMSSP auth as fallback
 435                  * send a request for secondary rpc connection
 436                  */
 437                 sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 438                                                                 s->binding);
 439                 composite_continue(c, sec_conn_req, continue_ntlmssp_connection, c);
 440                 return;
 441         } else if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE) ||
 442                    NT_STATUS_EQUAL(c->status, NT_STATUS_UNSUCCESSFUL)) {
 443                 /*
 444                   try a second time on any error. We don't just do it
 445                   on LOGON_FAILURE as some servers will give a
 446                   NT_STATUS_UNSUCCESSFUL on a authentication error on RPC
 447                  */
 448                 const char *principal;
 449                 const char *endpoint;
 450
 451                 principal = gensec_get_target_principal(s->pipe->conn->security_state.generic_state);
 452                 if (principal == NULL) {
 453                         const char *hostname = gensec_get_target_hostname(s->pipe->conn->security_state.generic_state);
 454                         const char *service  = gensec_get_target_service(s->pipe->conn->security_state.generic_state);
 455                         if (hostname != NULL && service != NULL) {
 456                                 principal = talloc_asprintf(c, "%s/%s", service, hostname);
 457                         }
 458                 }
 459
 460                 endpoint = dcerpc_binding_get_string_option(s->binding, "endpoint");
 461
 462                 if ((cli_credentials_failed_kerberos_login(s->credentials, principal, &s->logon_retries) ||
 463                      cli_credentials_wrong_password(s->credentials)) &&
 464                     endpoint != NULL) {
 465                         /*
 466                          * Retry SPNEGO with a better password
 467                          * send a request for secondary rpc connection
 468                          */
 469                         sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 470                                                                         s->binding);
 471                         composite_continue(c, sec_conn_req, continue_spnego_after_wrong_pass, c);
 472                         return;
 473                 }
 474         }
 475
 476         if (!composite_is_ok(c)) return;
 477
 478         composite_done(c);
 479 }
 480
 481 /*
 482   Stage 3 of pipe_auth (fallback to NTLMSSP case): Receive secondary
 483   rpc connection (the first one can't be used any more, due to the
 484   bind nak) and perform authenticated bind request
 485 */
 486 static void continue_ntlmssp_connection(struct composite_context *ctx)
 487 {
 488         struct composite_context *c;
 489         struct pipe_auth_state *s;
 490         struct composite_context *auth_req;
 491         struct dcerpc_pipe *p2;
 492         void *pp;
 493
 494         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 495         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 496
 497         /* receive secondary rpc connection */
 498         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 499         if (!composite_is_ok(c)) return;
 500
 501
 502         /* this is a rather strange situation. When
 503            we come into the routine, s is a child of s->pipe, and
 504            when we created p2 above, it also became a child of
 505            s->pipe.
 506
 507            Now we want p2 to be a parent of s->pipe, and we want s to
 508            be a parent of both of them! If we don't do this very
 509            carefully we end up creating a talloc loop
 510         */
 511
 512         /* we need the new contexts to hang off the same context
 513            that s->pipe is on, but the only way to get that is
 514            via talloc_parent() */
 515         pp = talloc_parent(s->pipe);
 516
 517         /* promote s to be at the top */
 518         talloc_steal(pp, s);
 519
 520         /* and put p2 under s */
 521         talloc_steal(s, p2);
 522
 523         /* now put s->pipe under p2 */
 524         talloc_steal(p2, s->pipe);
 525
 526         s->pipe = p2;
 527
 528         /* initiate a authenticated bind */
 529         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 530                                          s->credentials,
 531                                          lpcfg_gensec_settings(c, s->lp_ctx),
 532                                          DCERPC_AUTH_TYPE_NTLMSSP,
 533                                          dcerpc_auth_level(s->pipe->conn),
 534                                          s->table->authservices->names[0]);
 535         composite_continue(c, auth_req, continue_auth, c);
 536 }
 537
 538 /*
 539   Stage 3 of pipe_auth (retry on wrong password): Receive secondary
 540   rpc connection (the first one can't be used any more, due to the
 541   bind nak) and perform authenticated bind request
 542 */
 543 static void continue_spnego_after_wrong_pass(struct composite_context *ctx)
 544 {
 545         struct composite_context *c;
 546         struct pipe_auth_state *s;
 547         struct composite_context *auth_req;
 548         struct dcerpc_pipe *p2;
 549
 550         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 551         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 552
 553         /* receive secondary rpc connection */
 554         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 555         if (!composite_is_ok(c)) return;
 556
 557         talloc_steal(s, p2);
 558         talloc_steal(p2, s->pipe);
 559         s->pipe = p2;
 560
 561         /* initiate a authenticated bind */
 562         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 563                                          s->credentials,
 564                                          lpcfg_gensec_settings(c, s->lp_ctx),
 565                                          DCERPC_AUTH_TYPE_SPNEGO,
 566                                          dcerpc_auth_level(s->pipe->conn),
 567                                          s->table->authservices->names[0]);
 568         composite_continue(c, auth_req, continue_auth, c);
 569 }
 570
 571
 572 /*
 573   Stage 2 of pipe_auth: Receive result of non-authenticated bind request
 574 */
 575 static void continue_auth_none(struct composite_context *ctx)
 576 {
 577         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 578                                                       struct composite_context);
 579
 580         c->status = dcerpc_bind_auth_none_recv(ctx);
 581         if (!composite_is_ok(c)) return;
 582
 583         composite_done(c);
 584 }
 585
 586
 587 /*
 588   Request to perform an authenticated bind if required. Authentication
 589   is determined using credentials passed and binding flags.
 590 */
 591 struct composite_context *dcerpc_pipe_auth_send(struct dcerpc_pipe *p,
 592                                                 const struct dcerpc_binding *binding,
 593                                                 const struct ndr_interface_table *table,
 594                                                 struct cli_credentials *credentials,
 595                                                 struct loadparm_context *lp_ctx)
 596 {
 597         struct composite_context *c;
 598         struct pipe_auth_state *s;
 599         struct composite_context *auth_schannel_req;
 600         struct composite_context *auth_req;
 601         struct composite_context *auth_none_req;
 602         struct dcecli_connection *conn;
 603         uint8_t auth_type;
 604
 605         /* composite context allocation and setup */
 606         c = composite_create(p, p->conn->event_ctx);
 607         if (c == NULL) return NULL;
 608
 609         s = talloc_zero(c, struct pipe_auth_state);
 610         if (composite_nomem(s, c)) return c;
 611         c->private_data = s;
 612
 613         /* store parameters in state structure */
 614         s->binding      = binding;
 615         s->table        = table;
 616         s->credentials  = credentials;
 617         s->pipe         = p;
 618         s->lp_ctx       = lp_ctx;
 619
 620         conn = s->pipe->conn;
 621         conn->flags = dcerpc_binding_get_flags(binding);
 622
 623         if (DEBUGLVL(100)) {
 624                 conn->flags |= DCERPC_DEBUG_PRINT_BOTH;
 625         }
 626
 627         if (cli_credentials_is_anonymous(s->credentials)) {
 628                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 629                 composite_continue(c, auth_none_req, continue_auth_none, c);
 630                 return c;
 631         }
 632
 633         if ((conn->flags & DCERPC_SCHANNEL) &&
 634             !cli_credentials_get_netlogon_creds(s->credentials)) {
 635                 /* If we don't already have netlogon credentials for
 636                  * the schannel bind, then we have to get these
 637                  * first */
 638                 auth_schannel_req = dcerpc_bind_auth_schannel_send(c, s->pipe, s->table,
 639                                                                    s->credentials, s->lp_ctx,
 640                                                                    dcerpc_auth_level(conn));
 641                 composite_continue(c, auth_schannel_req, continue_auth_schannel, c);
 642                 return c;
 643         }
 644
 645         /*
 646          * we rely on the already authenticated CIFS connection
 647          * if not doing sign or seal
 648          */
 649         if (conn->transport.transport == NCACN_NP &&
 650             !(conn->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 651                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 652                 composite_continue(c, auth_none_req, continue_auth_none, c);
 653                 return c;
 654         }
 655
 656
 657         /* Perform an authenticated DCE-RPC bind
 658          */
 659         if (!(conn->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 660                 /*
 661                   we are doing an authenticated connection,
 662                   but not using sign or seal. We must force
 663                   the CONNECT dcerpc auth type as a NONE auth
 664                   type doesn't allow authentication
 665                   information to be passed.
 666                 */
 667                 conn->flags |= DCERPC_CONNECT;
 668         }
 669
 670         if (conn->flags & DCERPC_AUTH_SPNEGO) {
 671                 auth_type = DCERPC_AUTH_TYPE_SPNEGO;
 672
 673         } else if (conn->flags & DCERPC_AUTH_KRB5) {
 674                 auth_type = DCERPC_AUTH_TYPE_KRB5;
 675
 676         } else if (conn->flags & DCERPC_SCHANNEL) {
 677                 auth_type = DCERPC_AUTH_TYPE_SCHANNEL;
 678
 679         } else if (conn->flags & DCERPC_AUTH_NTLM) {
 680                 auth_type = DCERPC_AUTH_TYPE_NTLMSSP;
 681
 682         } else {
 683                 /* try SPNEGO with fallback to NTLMSSP */
 684                 auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 685                                                  s->credentials,
 686                                                  lpcfg_gensec_settings(c, s->lp_ctx),
 687                                                  DCERPC_AUTH_TYPE_SPNEGO,
 688                                                  dcerpc_auth_level(conn),
 689                                                  s->table->authservices->names[0]);
 690                 composite_continue(c, auth_req, continue_auth_auto, c);
 691                 return c;
 692         }
 693
 694         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 695                                          s->credentials,
 696                                          lpcfg_gensec_settings(c, s->lp_ctx),
 697                                          auth_type,
 698                                          dcerpc_auth_level(conn),
 699                                          s->table->authservices->names[0]);
 700         composite_continue(c, auth_req, continue_auth, c);
 701         return c;
 702 }
 703
 704
 705 /*
 706   Receive result of authenticated bind request on dcerpc pipe
 707
 708   This returns *p, which may be different to the one originally
 709   supllied, as it rebinds to a new pipe due to authentication fallback
 710
 711 */
 712 NTSTATUS dcerpc_pipe_auth_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 713                                struct dcerpc_pipe **p)
 714 {
 715         NTSTATUS status;
 716
 717         struct pipe_auth_state *s = talloc_get_type(c->private_data,
 718                                                     struct pipe_auth_state);
 719         status = composite_wait(c);
 720         if (!NT_STATUS_IS_OK(status)) {
 721                 char *uuid_str = GUID_string(s->pipe, &s->table->syntax_id.uuid);
 722                 DEBUG(0, ("Failed to bind to uuid %s for %s %s\n", uuid_str,
 723                           dcerpc_binding_string(uuid_str, s->binding), nt_errstr(status)));
 724                 talloc_free(uuid_str);
 725         } else {
 726                 talloc_steal(mem_ctx, s->pipe);
 727                 *p = s->pipe;
 728         }
 729
 730         talloc_free(c);
 731         return status;
 732 }
 733
 734
 735 /*
 736    Perform an authenticated bind if needed - sync version
 737
 738    This may change *p, as it rebinds to a new pipe due to authentication fallback
 739 */
 740 _PUBLIC_ NTSTATUS dcerpc_pipe_auth(TALLOC_CTX *mem_ctx,
 741                           struct dcerpc_pipe **p,
 742                           const struct dcerpc_binding *binding,
 743                           const struct ndr_interface_table *table,
 744                           struct cli_credentials *credentials,
 745                           struct loadparm_context *lp_ctx)
 746 {
 747         struct composite_context *c;
 748
 749         c = dcerpc_pipe_auth_send(*p, binding, table, credentials, lp_ctx);
 750         return dcerpc_pipe_auth_recv(c, mem_ctx, p);
 751 }
 752
 753
 754 NTSTATUS dcerpc_generic_session_key(struct dcecli_connection *c,
 755                                     DATA_BLOB *session_key)
 756 {
 757         /* this took quite a few CPU cycles to find ... */
 758         session_key->data = discard_const_p(unsigned char, "SystemLibraryDTC");
 759         session_key->length = 16;
 760         return NT_STATUS_OK;
 761 }
 762
 763 /*
 764   fetch the user session key - may be default (above) or the SMB session key
 765
 766   The key is always truncated to 16 bytes
 767 */
 768 _PUBLIC_ NTSTATUS dcerpc_fetch_session_key(struct dcerpc_pipe *p,
 769                                            DATA_BLOB *session_key)
 770 {
 771         NTSTATUS status;
 772         status = p->conn->security_state.session_key(p->conn, session_key);
 773         if (!NT_STATUS_IS_OK(status)) {
 774                 return status;
 775         }
 776
 777         session_key->length = MIN(session_key->length, 16);
 778
 779         return NT_STATUS_OK;
 780 }
 781
 782
 783 /*
 784   log a rpc packet in a format suitable for ndrdump. This is especially useful
 785   for sealed packets, where ethereal cannot easily see the contents
 786
 787   this triggers on a debug level of >= 10
 788 */
 789 _PUBLIC_ void dcerpc_log_packet(const char *lockdir,
 790                                 const struct ndr_interface_table *ndr,
 791                                 uint32_t opnum, uint32_t flags,
 792                                 const DATA_BLOB *pkt)
 793 {
 794         const int num_examples = 20;
 795         int i;
 796
 797         if (lockdir == NULL) return;
 798
 799         for (i=0;i<num_examples;i++) {
 800                 char *name=NULL;
 801                 int ret;
 802                 ret = asprintf(&name, "%s/rpclog/%s-%u.%d.%s",
 803                                lockdir, ndr->name, opnum, i,
 804                                (flags&NDR_IN)?"in":"out");
 805                 if (ret == -1) {
 806                         return;
 807                 }
 808                 if (!file_exist(name)) {
 809                         if (file_save(name, pkt->data, pkt->length)) {
 810                                 DEBUG(10,("Logged rpc packet to %s\n", name));
 811                         }
 812                         free(name);
 813                         break;
 814                 }
 815                 free(name);
 816         }
 817 }
 818
 819
 820
 821 /*
 822   create a secondary context from a primary connection
 823
 824   this uses dcerpc_alter_context() to create a new dcerpc context_id
 825 */
 826 _PUBLIC_ NTSTATUS dcerpc_secondary_context(struct dcerpc_pipe *p,
 827                                   struct dcerpc_pipe **pp2,
 828                                   const struct ndr_interface_table *table)
 829 {
 830         NTSTATUS status;
 831         struct dcerpc_pipe *p2;
 832
 833         p2 = talloc_zero(p, struct dcerpc_pipe);
 834         if (p2 == NULL) {
 835                 return NT_STATUS_NO_MEMORY;
 836         }
 837         p2->conn = talloc_reference(p2, p->conn);
 838         p2->request_timeout = p->request_timeout;
 839
 840         p2->context_id = ++p->conn->next_context_id;
 841
 842         p2->syntax = table->syntax_id;
 843
 844         p2->transfer_syntax = p->transfer_syntax;
 845
 846         p2->binding = dcerpc_binding_dup(p2, p->binding);
 847         if (p2->binding == NULL) {
 848                 talloc_free(p2);
 849                 return NT_STATUS_NO_MEMORY;
 850         }
 851
 852         p2->binding_handle = dcerpc_pipe_binding_handle(p2);
 853         if (p2->binding_handle == NULL) {
 854                 talloc_free(p2);
 855                 return NT_STATUS_NO_MEMORY;
 856         }
 857
 858         status = dcerpc_alter_context(p2, p2, &p2->syntax, &p2->transfer_syntax);
 859         if (!NT_STATUS_IS_OK(status)) {
 860                 talloc_free(p2);
 861                 return status;
 862         }
 863
 864         *pp2 = p2;
 865
 866         return NT_STATUS_OK;
 867 }