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 (auth_info) {
  68                 pkt->auth_length = auth_info->credentials.length;
  69         } else {
  70                 pkt->auth_length = 0;
  71         }
  72
  73         ndr_err = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
  74         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  75                 return ndr_map_error2ntstatus(ndr_err);
  76         }
  77
  78         if (auth_info) {
  79 #if 0
  80                 /* the s3 rpc server doesn't handle auth padding in
  81                    bind requests. Use zero auth padding to keep us
  82                    working with old servers */
  83                 uint32_t offset = ndr->offset;
  84                 ndr_err = ndr_push_align(ndr, 16);
  85                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  86                         return ndr_map_error2ntstatus(ndr_err);
  87                 }
  88                 auth_info->auth_pad_length = ndr->offset - offset;
  89 #else
  90                 auth_info->auth_pad_length = 0;
  91 #endif
  92                 ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, auth_info);
  93                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  94                         return ndr_map_error2ntstatus(ndr_err);
  95                 }
  96         }
  97
  98         *blob = ndr_push_blob(ndr);
  99
 100         /* fill in the frag length */
 101         dcerpc_set_frag_length(blob, blob->length);
 102
 103         return NT_STATUS_OK;
 104 }
 105
 106
 107 struct epm_map_binding_state {
 108         struct dcerpc_binding *binding;
 109         const struct ndr_interface_table *table;
 110         struct dcerpc_pipe *pipe;
 111         struct policy_handle handle;
 112         struct GUID object;
 113         struct epm_twr_t twr;
 114         struct epm_twr_t *twr_r;
 115         uint32_t num_towers;
 116         struct epm_Map r;
 117 };
 118
 119
 120 static void continue_epm_recv_binding(struct composite_context *ctx);
 121 static void continue_epm_map(struct tevent_req *subreq);
 122
 123
 124 /*
 125   Stage 2 of epm_map_binding: Receive connected rpc pipe and send endpoint
 126   mapping rpc request
 127 */
 128 static void continue_epm_recv_binding(struct composite_context *ctx)
 129 {
 130         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 131                                                       struct composite_context);
 132         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
 133                                                           struct epm_map_binding_state);
 134         struct tevent_req *subreq;
 135
 136         /* receive result of rpc pipe connect request */
 137         c->status = dcerpc_pipe_connect_b_recv(ctx, c, &s->pipe);
 138         if (!composite_is_ok(c)) return;
 139
 140         c->status = dcerpc_binding_build_tower(s->pipe, s->binding, &s->twr.tower);
 141         if (!composite_is_ok(c)) return;
 142
 143         /* with some nice pretty paper around it of course */
 144         s->r.in.object        = &s->object;
 145         s->r.in.map_tower     = &s->twr;
 146         s->r.in.entry_handle  = &s->handle;
 147         s->r.in.max_towers    = 1;
 148         s->r.out.entry_handle = &s->handle;
 149         s->r.out.num_towers   = &s->num_towers;
 150
 151         /* send request for an endpoint mapping - a rpc request on connected pipe */
 152         subreq = dcerpc_epm_Map_r_send(s, c->event_ctx,
 153                                        s->pipe->binding_handle,
 154                                        &s->r);
 155         if (composite_nomem(subreq, c)) return;
 156
 157         tevent_req_set_callback(subreq, continue_epm_map, c);
 158 }
 159
 160
 161 /*
 162   Stage 3 of epm_map_binding: Receive endpoint mapping and provide binding details
 163 */
 164 static void continue_epm_map(struct tevent_req *subreq)
 165 {
 166         struct composite_context *c = tevent_req_callback_data(subreq,
 167                                       struct composite_context);
 168         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
 169                                                           struct epm_map_binding_state);
 170         const char *endpoint;
 171
 172         /* receive result of a rpc request */
 173         c->status = dcerpc_epm_Map_r_recv(subreq, s);
 174         TALLOC_FREE(subreq);
 175         if (!composite_is_ok(c)) return;
 176
 177         /* check the details */
 178         if (s->r.out.result != 0 || *s->r.out.num_towers != 1) {
 179                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 180                 return;
 181         }
 182
 183         s->twr_r = s->r.out.towers[0].twr;
 184         if (s->twr_r == NULL) {
 185                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 186                 return;
 187         }
 188
 189         if (s->twr_r->tower.num_floors != s->twr.tower.num_floors ||
 190             s->twr_r->tower.floors[3].lhs.protocol != s->twr.tower.floors[3].lhs.protocol) {
 191                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 192                 return;
 193         }
 194
 195         /* get received endpoint */
 196         endpoint = dcerpc_floor_get_rhs_data(s, &s->twr_r->tower.floors[3]);
 197         if (composite_nomem(endpoint, c)) return;
 198
 199         c->status = dcerpc_binding_set_string_option(s->binding,
 200                                                      "endpoint",
 201                                                      endpoint);
 202         if (!composite_is_ok(c)) {
 203                 return;
 204         }
 205
 206         composite_done(c);
 207 }
 208
 209
 210 /*
 211   Request for endpoint mapping of dcerpc binding - try to request for endpoint
 212   unless there is default one.
 213 */
 214 struct composite_context *dcerpc_epm_map_binding_send(TALLOC_CTX *mem_ctx,
 215                                                       struct dcerpc_binding *binding,
 216                                                       const struct ndr_interface_table *table,
 217                                                       struct cli_credentials *creds,
 218                                                       struct tevent_context *ev,
 219                                                       struct loadparm_context *lp_ctx)
 220 {
 221         struct composite_context *c;
 222         struct epm_map_binding_state *s;
 223         struct composite_context *pipe_connect_req;
 224         NTSTATUS status;
 225         struct dcerpc_binding *epmapper_binding;
 226         int i;
 227
 228         if (ev == NULL) {
 229                 return NULL;
 230         }
 231
 232         /* composite context allocation and setup */
 233         c = composite_create(mem_ctx, ev);
 234         if (c == NULL) {
 235                 return NULL;
 236         }
 237
 238         s = talloc_zero(c, struct epm_map_binding_state);
 239         if (composite_nomem(s, c)) return c;
 240         c->private_data = s;
 241
 242         s->binding = binding;
 243         s->object  = dcerpc_binding_get_object(binding);
 244         s->table   = table;
 245
 246         c->status = dcerpc_binding_set_abstract_syntax(binding,
 247                                                        &table->syntax_id);
 248         if (!composite_is_ok(c)) {
 249                 return c;
 250         }
 251
 252         /*
 253           First, check if there is a default endpoint specified in the IDL
 254         */
 255         for (i = 0; i < table->endpoints->count; i++) {
 256                 struct dcerpc_binding *default_binding;
 257                 enum dcerpc_transport_t transport;
 258                 enum dcerpc_transport_t dtransport;
 259                 const char *dendpoint = NULL;
 260
 261                 status = dcerpc_parse_binding(s,
 262                                               table->endpoints->names[i],
 263                                               &default_binding);
 264                 if (!NT_STATUS_IS_OK(status)) {
 265                         continue;
 266                 }
 267
 268                 transport = dcerpc_binding_get_transport(binding);
 269                 dtransport = dcerpc_binding_get_transport(default_binding);
 270                 if (transport == NCA_UNKNOWN) {
 271                         c->status = dcerpc_binding_set_transport(binding,
 272                                                                  dtransport);
 273                         if (!composite_is_ok(c)) {
 274                                 return c;
 275                         }
 276                         transport = dtransport;
 277                 }
 278
 279                 if (transport != dtransport) {
 280                         TALLOC_FREE(default_binding);
 281                         continue;
 282                 }
 283
 284                 dendpoint = dcerpc_binding_get_string_option(default_binding,
 285                                                              "endpoint");
 286                 if (dendpoint == NULL) {
 287                         TALLOC_FREE(default_binding);
 288                         continue;
 289                 }
 290
 291                 c->status = dcerpc_binding_set_string_option(binding,
 292                                                              "endpoint",
 293                                                              dendpoint);
 294                 if (!composite_is_ok(c)) {
 295                         return c;
 296                 }
 297
 298                 TALLOC_FREE(default_binding);
 299                 composite_done(c);
 300                 return c;
 301         }
 302
 303         epmapper_binding = dcerpc_binding_dup(s, binding);
 304         if (composite_nomem(epmapper_binding, c)) return c;
 305
 306         /* basic endpoint mapping data */
 307         c->status = dcerpc_binding_set_string_option(epmapper_binding,
 308                                                      "endpoint", NULL);
 309         if (!composite_is_ok(c)) {
 310                 return c;
 311         }
 312         c->status = dcerpc_binding_set_flags(epmapper_binding, 0, UINT32_MAX);
 313         if (!composite_is_ok(c)) {
 314                 return c;
 315         }
 316         c->status = dcerpc_binding_set_assoc_group_id(epmapper_binding, 0);
 317         if (!composite_is_ok(c)) {
 318                 return c;
 319         }
 320         c->status = dcerpc_binding_set_object(epmapper_binding, GUID_zero());
 321         if (!composite_is_ok(c)) {
 322                 return c;
 323         }
 324
 325         /* initiate rpc pipe connection */
 326         pipe_connect_req = dcerpc_pipe_connect_b_send(s, epmapper_binding,
 327                                                       &ndr_table_epmapper,
 328                                                       creds, c->event_ctx,
 329                                                       lp_ctx);
 330         if (composite_nomem(pipe_connect_req, c)) return c;
 331
 332         composite_continue(c, pipe_connect_req, continue_epm_recv_binding, c);
 333         return c;
 334 }
 335
 336
 337 /*
 338   Receive result of endpoint mapping request
 339  */
 340 NTSTATUS dcerpc_epm_map_binding_recv(struct composite_context *c)
 341 {
 342         NTSTATUS status = composite_wait(c);
 343
 344         talloc_free(c);
 345         return status;
 346 }
 347
 348
 349 /*
 350   Get endpoint mapping for rpc connection
 351 */
 352 _PUBLIC_ NTSTATUS dcerpc_epm_map_binding(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding,
 353                                 const struct ndr_interface_table *table, struct tevent_context *ev,
 354                                 struct loadparm_context *lp_ctx)
 355 {
 356         struct composite_context *c;
 357         struct cli_credentials *epm_creds;
 358
 359         epm_creds = cli_credentials_init_anon(mem_ctx);
 360         if (epm_creds == NULL) {
 361                 return NT_STATUS_NO_MEMORY;
 362         }
 363         c = dcerpc_epm_map_binding_send(mem_ctx, binding, table, epm_creds, ev, lp_ctx);
 364         if (c == NULL) {
 365                 talloc_free(epm_creds);
 366                 return NT_STATUS_NO_MEMORY;
 367         }
 368         talloc_steal(c, epm_creds);
 369         return dcerpc_epm_map_binding_recv(c);
 370 }
 371
 372
 373 struct pipe_auth_state {
 374         struct dcerpc_pipe *pipe;
 375         const struct dcerpc_binding *binding;
 376         const struct ndr_interface_table *table;
 377         struct loadparm_context *lp_ctx;
 378         struct cli_credentials *credentials;
 379         unsigned int logon_retries;
 380 };
 381
 382
 383 static void continue_auth_schannel(struct composite_context *ctx);
 384 static void continue_auth(struct composite_context *ctx);
 385 static void continue_auth_none(struct composite_context *ctx);
 386 static void continue_ntlmssp_connection(struct composite_context *ctx);
 387 static void continue_spnego_after_wrong_pass(struct composite_context *ctx);
 388
 389
 390 /*
 391   Stage 2 of pipe_auth: Receive result of schannel bind request
 392 */
 393 static void continue_auth_schannel(struct composite_context *ctx)
 394 {
 395         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 396                                                       struct composite_context);
 397
 398         c->status = dcerpc_bind_auth_schannel_recv(ctx);
 399         if (!composite_is_ok(c)) return;
 400
 401         composite_done(c);
 402 }
 403
 404
 405 /*
 406   Stage 2 of pipe_auth: Receive result of authenticated bind request
 407 */
 408 static void continue_auth(struct composite_context *ctx)
 409 {
 410         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 411                                                       struct composite_context);
 412
 413         c->status = dcerpc_bind_auth_recv(ctx);
 414         if (!composite_is_ok(c)) return;
 415
 416         composite_done(c);
 417 }
 418 /*
 419   Stage 2 of pipe_auth: Receive result of authenticated bind request, but handle fallbacks:
 420   SPNEGO -> NTLMSSP
 421 */
 422 static void continue_auth_auto(struct composite_context *ctx)
 423 {
 424         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 425                                                       struct composite_context);
 426         struct pipe_auth_state *s = talloc_get_type(c->private_data, struct pipe_auth_state);
 427         struct composite_context *sec_conn_req;
 428
 429         c->status = dcerpc_bind_auth_recv(ctx);
 430         if (NT_STATUS_EQUAL(c->status, NT_STATUS_INVALID_PARAMETER)) {
 431                 /*
 432                  * Retry with NTLMSSP auth as fallback
 433                  * send a request for secondary rpc connection
 434                  */
 435                 sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 436                                                                 s->binding);
 437                 composite_continue(c, sec_conn_req, continue_ntlmssp_connection, c);
 438                 return;
 439         } else if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE) ||
 440                    NT_STATUS_EQUAL(c->status, NT_STATUS_UNSUCCESSFUL)) {
 441                 /*
 442                   try a second time on any error. We don't just do it
 443                   on LOGON_FAILURE as some servers will give a
 444                   NT_STATUS_UNSUCCESSFUL on a authentication error on RPC
 445                  */
 446                 const char *principal;
 447                 const char *endpoint;
 448
 449                 principal = gensec_get_target_principal(s->pipe->conn->security_state.generic_state);
 450                 if (principal == NULL) {
 451                         const char *hostname = gensec_get_target_hostname(s->pipe->conn->security_state.generic_state);
 452                         const char *service  = gensec_get_target_service(s->pipe->conn->security_state.generic_state);
 453                         if (hostname != NULL && service != NULL) {
 454                                 principal = talloc_asprintf(c, "%s/%s", service, hostname);
 455                         }
 456                 }
 457
 458                 endpoint = dcerpc_binding_get_string_option(s->binding, "endpoint");
 459
 460                 if ((cli_credentials_failed_kerberos_login(s->credentials, principal, &s->logon_retries) ||
 461                      cli_credentials_wrong_password(s->credentials)) &&
 462                     endpoint != NULL) {
 463                         /*
 464                          * Retry SPNEGO with a better password
 465                          * send a request for secondary rpc connection
 466                          */
 467                         sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 468                                                                         s->binding);
 469                         composite_continue(c, sec_conn_req, continue_spnego_after_wrong_pass, c);
 470                         return;
 471                 }
 472         }
 473
 474         if (!composite_is_ok(c)) return;
 475
 476         composite_done(c);
 477 }
 478
 479 /*
 480   Stage 3 of pipe_auth (fallback to NTLMSSP case): Receive secondary
 481   rpc connection (the first one can't be used any more, due to the
 482   bind nak) and perform authenticated bind request
 483 */
 484 static void continue_ntlmssp_connection(struct composite_context *ctx)
 485 {
 486         struct composite_context *c;
 487         struct pipe_auth_state *s;
 488         struct composite_context *auth_req;
 489         struct dcerpc_pipe *p2;
 490         void *pp;
 491
 492         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 493         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 494
 495         /* receive secondary rpc connection */
 496         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 497         if (!composite_is_ok(c)) return;
 498
 499
 500         /* this is a rather strange situation. When
 501            we come into the routine, s is a child of s->pipe, and
 502            when we created p2 above, it also became a child of
 503            s->pipe.
 504
 505            Now we want p2 to be a parent of s->pipe, and we want s to
 506            be a parent of both of them! If we don't do this very
 507            carefully we end up creating a talloc loop
 508         */
 509
 510         /* we need the new contexts to hang off the same context
 511            that s->pipe is on, but the only way to get that is
 512            via talloc_parent() */
 513         pp = talloc_parent(s->pipe);
 514
 515         /* promote s to be at the top */
 516         talloc_steal(pp, s);
 517
 518         /* and put p2 under s */
 519         talloc_steal(s, p2);
 520
 521         /* now put s->pipe under p2 */
 522         talloc_steal(p2, s->pipe);
 523
 524         s->pipe = p2;
 525
 526         /* initiate a authenticated bind */
 527         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 528                                          s->credentials,
 529                                          lpcfg_gensec_settings(c, s->lp_ctx),
 530                                          DCERPC_AUTH_TYPE_NTLMSSP,
 531                                          dcerpc_auth_level(s->pipe->conn),
 532                                          s->table->authservices->names[0]);
 533         composite_continue(c, auth_req, continue_auth, c);
 534 }
 535
 536 /*
 537   Stage 3 of pipe_auth (retry on wrong password): Receive secondary
 538   rpc connection (the first one can't be used any more, due to the
 539   bind nak) and perform authenticated bind request
 540 */
 541 static void continue_spnego_after_wrong_pass(struct composite_context *ctx)
 542 {
 543         struct composite_context *c;
 544         struct pipe_auth_state *s;
 545         struct composite_context *auth_req;
 546         struct dcerpc_pipe *p2;
 547
 548         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 549         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 550
 551         /* receive secondary rpc connection */
 552         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 553         if (!composite_is_ok(c)) return;
 554
 555         talloc_steal(s, p2);
 556         talloc_steal(p2, s->pipe);
 557         s->pipe = p2;
 558
 559         /* initiate a authenticated bind */
 560         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 561                                          s->credentials,
 562                                          lpcfg_gensec_settings(c, s->lp_ctx),
 563                                          DCERPC_AUTH_TYPE_SPNEGO,
 564                                          dcerpc_auth_level(s->pipe->conn),
 565                                          s->table->authservices->names[0]);
 566         composite_continue(c, auth_req, continue_auth, c);
 567 }
 568
 569
 570 /*
 571   Stage 2 of pipe_auth: Receive result of non-authenticated bind request
 572 */
 573 static void continue_auth_none(struct composite_context *ctx)
 574 {
 575         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 576                                                       struct composite_context);
 577
 578         c->status = dcerpc_bind_auth_none_recv(ctx);
 579         if (!composite_is_ok(c)) return;
 580
 581         composite_done(c);
 582 }
 583
 584
 585 /*
 586   Request to perform an authenticated bind if required. Authentication
 587   is determined using credentials passed and binding flags.
 588 */
 589 struct composite_context *dcerpc_pipe_auth_send(struct dcerpc_pipe *p,
 590                                                 const struct dcerpc_binding *binding,
 591                                                 const struct ndr_interface_table *table,
 592                                                 struct cli_credentials *credentials,
 593                                                 struct loadparm_context *lp_ctx)
 594 {
 595         struct composite_context *c;
 596         struct pipe_auth_state *s;
 597         struct composite_context *auth_schannel_req;
 598         struct composite_context *auth_req;
 599         struct composite_context *auth_none_req;
 600         struct dcecli_connection *conn;
 601         uint8_t auth_type;
 602
 603         /* composite context allocation and setup */
 604         c = composite_create(p, p->conn->event_ctx);
 605         if (c == NULL) return NULL;
 606
 607         s = talloc_zero(c, struct pipe_auth_state);
 608         if (composite_nomem(s, c)) return c;
 609         c->private_data = s;
 610
 611         /* store parameters in state structure */
 612         s->binding      = binding;
 613         s->table        = table;
 614         s->credentials  = credentials;
 615         s->pipe         = p;
 616         s->lp_ctx       = lp_ctx;
 617
 618         conn = s->pipe->conn;
 619         conn->flags = dcerpc_binding_get_flags(binding);
 620
 621         if (DEBUGLVL(100)) {
 622                 conn->flags |= DCERPC_DEBUG_PRINT_BOTH;
 623         }
 624
 625         if (conn->transport.transport == NCALRPC) {
 626                 const char *v = dcerpc_binding_get_string_option(binding,
 627                                                         "auth_type");
 628
 629                 if (v != NULL && strcmp(v, "ncalrpc_as_system") == 0) {
 630                         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 631                                                  s->credentials,
 632                                                  lpcfg_gensec_settings(c, s->lp_ctx),
 633                                                  DCERPC_AUTH_TYPE_NCALRPC_AS_SYSTEM,
 634                                                  DCERPC_AUTH_LEVEL_CONNECT,
 635                                                  s->table->authservices->names[0]);
 636                         composite_continue(c, auth_req, continue_auth, c);
 637                         return c;
 638                 }
 639         }
 640
 641         if (cli_credentials_is_anonymous(s->credentials)) {
 642                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 643                 composite_continue(c, auth_none_req, continue_auth_none, c);
 644                 return c;
 645         }
 646
 647         if ((conn->flags & DCERPC_SCHANNEL) &&
 648             !cli_credentials_get_netlogon_creds(s->credentials)) {
 649                 /* If we don't already have netlogon credentials for
 650                  * the schannel bind, then we have to get these
 651                  * first */
 652                 auth_schannel_req = dcerpc_bind_auth_schannel_send(c, s->pipe, s->table,
 653                                                                    s->credentials, s->lp_ctx,
 654                                                                    dcerpc_auth_level(conn));
 655                 composite_continue(c, auth_schannel_req, continue_auth_schannel, c);
 656                 return c;
 657         }
 658
 659         /*
 660          * we rely on the already authenticated CIFS connection
 661          * if not doing sign or seal
 662          */
 663         if (conn->transport.transport == NCACN_NP &&
 664             !(conn->flags & (DCERPC_PACKET|DCERPC_SIGN|DCERPC_SEAL))) {
 665                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 666                 composite_continue(c, auth_none_req, continue_auth_none, c);
 667                 return c;
 668         }
 669
 670
 671         /* Perform an authenticated DCE-RPC bind
 672          */
 673         if (!(conn->flags & (DCERPC_CONNECT|DCERPC_SEAL|DCERPC_PACKET))) {
 674                 /*
 675                   we are doing an authenticated connection,
 676                   which needs to use [connect], [sign] or [seal].
 677                   If nothing is specified, we default to [sign] now.
 678                   This give roughly the same protection as
 679                   ncacn_np with smb signing.
 680                 */
 681                 conn->flags |= DCERPC_SIGN;
 682         }
 683
 684         if (conn->flags & DCERPC_AUTH_SPNEGO) {
 685                 auth_type = DCERPC_AUTH_TYPE_SPNEGO;
 686
 687         } else if (conn->flags & DCERPC_AUTH_KRB5) {
 688                 auth_type = DCERPC_AUTH_TYPE_KRB5;
 689
 690         } else if (conn->flags & DCERPC_SCHANNEL) {
 691                 auth_type = DCERPC_AUTH_TYPE_SCHANNEL;
 692
 693         } else if (conn->flags & DCERPC_AUTH_NTLM) {
 694                 auth_type = DCERPC_AUTH_TYPE_NTLMSSP;
 695
 696         } else {
 697                 /* try SPNEGO with fallback to NTLMSSP */
 698                 auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 699                                                  s->credentials,
 700                                                  lpcfg_gensec_settings(c, s->lp_ctx),
 701                                                  DCERPC_AUTH_TYPE_SPNEGO,
 702                                                  dcerpc_auth_level(conn),
 703                                                  s->table->authservices->names[0]);
 704                 composite_continue(c, auth_req, continue_auth_auto, c);
 705                 return c;
 706         }
 707
 708         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 709                                          s->credentials,
 710                                          lpcfg_gensec_settings(c, s->lp_ctx),
 711                                          auth_type,
 712                                          dcerpc_auth_level(conn),
 713                                          s->table->authservices->names[0]);
 714         composite_continue(c, auth_req, continue_auth, c);
 715         return c;
 716 }
 717
 718
 719 /*
 720   Receive result of authenticated bind request on dcerpc pipe
 721
 722   This returns *p, which may be different to the one originally
 723   supllied, as it rebinds to a new pipe due to authentication fallback
 724
 725 */
 726 NTSTATUS dcerpc_pipe_auth_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 727                                struct dcerpc_pipe **p)
 728 {
 729         NTSTATUS status;
 730
 731         struct pipe_auth_state *s = talloc_get_type(c->private_data,
 732                                                     struct pipe_auth_state);
 733         status = composite_wait(c);
 734         if (!NT_STATUS_IS_OK(status)) {
 735                 char *uuid_str = GUID_string(s->pipe, &s->table->syntax_id.uuid);
 736                 DEBUG(0, ("Failed to bind to uuid %s for %s %s\n", uuid_str,
 737                           dcerpc_binding_string(uuid_str, s->binding), nt_errstr(status)));
 738                 talloc_free(uuid_str);
 739         } else {
 740                 talloc_steal(mem_ctx, s->pipe);
 741                 *p = s->pipe;
 742         }
 743
 744         talloc_free(c);
 745         return status;
 746 }
 747
 748
 749 /*
 750    Perform an authenticated bind if needed - sync version
 751
 752    This may change *p, as it rebinds to a new pipe due to authentication fallback
 753 */
 754 _PUBLIC_ NTSTATUS dcerpc_pipe_auth(TALLOC_CTX *mem_ctx,
 755                           struct dcerpc_pipe **p,
 756                           const struct dcerpc_binding *binding,
 757                           const struct ndr_interface_table *table,
 758                           struct cli_credentials *credentials,
 759                           struct loadparm_context *lp_ctx)
 760 {
 761         struct composite_context *c;
 762
 763         c = dcerpc_pipe_auth_send(*p, binding, table, credentials, lp_ctx);
 764         return dcerpc_pipe_auth_recv(c, mem_ctx, p);
 765 }
 766
 767
 768 NTSTATUS dcerpc_generic_session_key(struct dcecli_connection *c,
 769                                     DATA_BLOB *session_key)
 770 {
 771         *session_key = data_blob_null;
 772
 773         if (c != NULL) {
 774                 if (c->transport.transport != NCALRPC &&
 775                     c->transport.transport != NCACN_UNIX_STREAM)
 776                 {
 777                         return NT_STATUS_LOCAL_USER_SESSION_KEY;
 778                 }
 779         }
 780
 781         /* this took quite a few CPU cycles to find ... */
 782         session_key->data = discard_const_p(unsigned char, "SystemLibraryDTC");
 783         session_key->length = 16;
 784         return NT_STATUS_OK;
 785 }
 786
 787 /*
 788   fetch the user session key - may be default (above) or the SMB session key
 789
 790   The key is always truncated to 16 bytes
 791 */
 792 _PUBLIC_ NTSTATUS dcerpc_fetch_session_key(struct dcerpc_pipe *p,
 793                                            DATA_BLOB *session_key)
 794 {
 795         NTSTATUS status;
 796         status = p->conn->security_state.session_key(p->conn, session_key);
 797         if (!NT_STATUS_IS_OK(status)) {
 798                 return status;
 799         }
 800
 801         session_key->length = MIN(session_key->length, 16);
 802
 803         return NT_STATUS_OK;
 804 }
 805
 806
 807 /*
 808   log a rpc packet in a format suitable for ndrdump. This is especially useful
 809   for sealed packets, where ethereal cannot easily see the contents
 810
 811   this triggers on a debug level of >= 10
 812 */
 813 _PUBLIC_ void dcerpc_log_packet(const char *lockdir,
 814                                 const struct ndr_interface_table *ndr,
 815                                 uint32_t opnum, uint32_t flags,
 816                                 const DATA_BLOB *pkt)
 817 {
 818         const int num_examples = 20;
 819         int i;
 820
 821         if (lockdir == NULL) return;
 822
 823         for (i=0;i<num_examples;i++) {
 824                 char *name=NULL;
 825                 int ret;
 826                 ret = asprintf(&name, "%s/rpclog/%s-%u.%d.%s",
 827                                lockdir, ndr->name, opnum, i,
 828                                (flags&NDR_IN)?"in":"out");
 829                 if (ret == -1) {
 830                         return;
 831                 }
 832                 if (!file_exist(name)) {
 833                         if (file_save(name, pkt->data, pkt->length)) {
 834                                 DEBUG(10,("Logged rpc packet to %s\n", name));
 835                         }
 836                         free(name);
 837                         break;
 838                 }
 839                 free(name);
 840         }
 841 }
 842
 843
 844
 845 /*
 846   create a secondary context from a primary connection
 847
 848   this uses dcerpc_alter_context() to create a new dcerpc context_id
 849 */
 850 _PUBLIC_ NTSTATUS dcerpc_secondary_context(struct dcerpc_pipe *p,
 851                                   struct dcerpc_pipe **pp2,
 852                                   const struct ndr_interface_table *table)
 853 {
 854         NTSTATUS status;
 855         struct dcerpc_pipe *p2;
 856         struct GUID *object = NULL;
 857
 858         p2 = talloc_zero(p, struct dcerpc_pipe);
 859         if (p2 == NULL) {
 860                 return NT_STATUS_NO_MEMORY;
 861         }
 862         p2->conn = talloc_reference(p2, p->conn);
 863         p2->request_timeout = p->request_timeout;
 864
 865         p2->context_id = ++p->conn->next_context_id;
 866
 867         p2->syntax = table->syntax_id;
 868
 869         p2->transfer_syntax = p->transfer_syntax;
 870
 871         p2->binding = dcerpc_binding_dup(p2, p->binding);
 872         if (p2->binding == NULL) {
 873                 talloc_free(p2);
 874                 return NT_STATUS_NO_MEMORY;
 875         }
 876
 877         p2->object = dcerpc_binding_get_object(p2->binding);
 878         if (!GUID_all_zero(&p2->object)) {
 879                 object = &p2->object;
 880         }
 881
 882         p2->binding_handle = dcerpc_pipe_binding_handle(p2, object, table);
 883         if (p2->binding_handle == NULL) {
 884                 talloc_free(p2);
 885                 return NT_STATUS_NO_MEMORY;
 886         }
 887
 888         status = dcerpc_alter_context(p2, p2, &p2->syntax, &p2->transfer_syntax);
 889         if (!NT_STATUS_IS_OK(status)) {
 890                 talloc_free(p2);
 891                 return status;
 892         }
 893
 894         *pp2 = p2;
 895
 896         return NT_STATUS_OK;
 897 }