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