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 "param/param.h"
  34
  35 /*
  36   find a dcerpc call on an interface by name
  37 */
  38 const struct ndr_interface_call *dcerpc_iface_find_call(const struct ndr_interface_table *iface,
  39                                                         const char *name)
  40 {
  41         int i;
  42         for (i=0;i<iface->num_calls;i++) {
  43                 if (strcmp(iface->calls[i].name, name) == 0) {
  44                         return &iface->calls[i];
  45                 }
  46         }
  47         return NULL;
  48 }
  49
  50 /*
  51    push a ncacn_packet into a blob, potentially with auth info
  52 */
  53 NTSTATUS ncacn_push_auth(DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
  54                          struct smb_iconv_convenience *iconv_convenience,
  55                           struct ncacn_packet *pkt,
  56                           struct dcerpc_auth *auth_info)
  57 {
  58         struct ndr_push *ndr;
  59         enum ndr_err_code ndr_err;
  60
  61         ndr = ndr_push_init_ctx(mem_ctx, iconv_convenience);
  62         if (!ndr) {
  63                 return NT_STATUS_NO_MEMORY;
  64         }
  65
  66         if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
  67                 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
  68         }
  69
  70         if (pkt->pfc_flags & DCERPC_PFC_FLAG_OBJECT_UUID) {
  71                 ndr->flags |= LIBNDR_FLAG_OBJECT_PRESENT;
  72         }
  73
  74         if (auth_info) {
  75                 pkt->auth_length = auth_info->credentials.length;
  76         } else {
  77                 pkt->auth_length = 0;
  78         }
  79
  80         ndr_err = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
  81         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  82                 return ndr_map_error2ntstatus(ndr_err);
  83         }
  84
  85         if (auth_info) {
  86                 ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, auth_info);
  87                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  88                         return ndr_map_error2ntstatus(ndr_err);
  89                 }
  90         }
  91
  92         *blob = ndr_push_blob(ndr);
  93
  94         /* fill in the frag length */
  95         dcerpc_set_frag_length(blob, blob->length);
  96
  97         return NT_STATUS_OK;
  98 }
  99
 100
 101 struct epm_map_binding_state {
 102         struct dcerpc_binding *binding;
 103         const struct ndr_interface_table *table;
 104         struct dcerpc_pipe *pipe;
 105         struct policy_handle handle;
 106         struct GUID guid;
 107         struct epm_twr_t twr;
 108         struct epm_twr_t *twr_r;
 109         struct epm_Map r;
 110 };
 111
 112
 113 static void continue_epm_recv_binding(struct composite_context *ctx);
 114 static void continue_epm_map(struct rpc_request *req);
 115
 116
 117 /*
 118   Stage 2 of epm_map_binding: Receive connected rpc pipe and send endpoint
 119   mapping rpc request
 120 */
 121 static void continue_epm_recv_binding(struct composite_context *ctx)
 122 {
 123         struct rpc_request *map_req;
 124
 125         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 126                                                       struct composite_context);
 127         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
 128                                                           struct epm_map_binding_state);
 129
 130         /* receive result of rpc pipe connect request */
 131         c->status = dcerpc_pipe_connect_b_recv(ctx, c, &s->pipe);
 132         if (!composite_is_ok(c)) return;
 133
 134         s->pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 135
 136         /* prepare requested binding parameters */
 137         s->binding->object         = s->table->syntax_id;
 138
 139         c->status = dcerpc_binding_build_tower(s->pipe, s->binding, &s->twr.tower);
 140         if (!composite_is_ok(c)) return;
 141
 142         /* with some nice pretty paper around it of course */
 143         s->r.in.object        = &s->guid;
 144         s->r.in.map_tower     = &s->twr;
 145         s->r.in.entry_handle  = &s->handle;
 146         s->r.in.max_towers    = 1;
 147         s->r.out.entry_handle = &s->handle;
 148
 149         /* send request for an endpoint mapping - a rpc request on connected pipe */
 150         map_req = dcerpc_epm_Map_send(s->pipe, c, &s->r);
 151         if (composite_nomem(map_req, c)) return;
 152
 153         composite_continue_rpc(c, map_req, continue_epm_map, c);
 154 }
 155
 156
 157 /*
 158   Stage 3 of epm_map_binding: Receive endpoint mapping and provide binding details
 159 */
 160 static void continue_epm_map(struct rpc_request *req)
 161 {
 162         struct composite_context *c = talloc_get_type(req->async.private_data,
 163                                                       struct composite_context);
 164         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
 165                                                           struct epm_map_binding_state);
 166
 167         /* receive result of a rpc request */
 168         c->status = dcerpc_ndr_request_recv(req);
 169         if (!composite_is_ok(c)) return;
 170
 171         /* check the details */
 172         if (s->r.out.result != 0 || *s->r.out.num_towers != 1) {
 173                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 174                 return;
 175         }
 176
 177         s->twr_r = s->r.out.towers[0].twr;
 178         if (s->twr_r == NULL) {
 179                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 180                 return;
 181         }
 182
 183         if (s->twr_r->tower.num_floors != s->twr.tower.num_floors ||
 184             s->twr_r->tower.floors[3].lhs.protocol != s->twr.tower.floors[3].lhs.protocol) {
 185                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 186                 return;
 187         }
 188
 189         /* get received endpoint */
 190         s->binding->endpoint = talloc_reference(s->binding,
 191                                                 dcerpc_floor_get_rhs_data(c, &s->twr_r->tower.floors[3]));
 192         if (composite_nomem(s->binding->endpoint, c)) return;
 193
 194         composite_done(c);
 195 }
 196
 197
 198 /*
 199   Request for endpoint mapping of dcerpc binding - try to request for endpoint
 200   unless there is default one.
 201 */
 202 struct composite_context *dcerpc_epm_map_binding_send(TALLOC_CTX *mem_ctx,
 203                                                       struct dcerpc_binding *binding,
 204                                                       const struct ndr_interface_table *table,
 205                                                       struct event_context *ev,
 206                                                       struct loadparm_context *lp_ctx)
 207 {
 208         struct composite_context *c;
 209         struct epm_map_binding_state *s;
 210         struct composite_context *pipe_connect_req;
 211         struct cli_credentials *anon_creds;
 212         struct event_context *new_ev = NULL;
 213
 214         NTSTATUS status;
 215         struct dcerpc_binding *epmapper_binding;
 216         int i;
 217
 218         /* Try to find event context in memory context in case passed
 219          * event_context (argument) was NULL. If there's none, just
 220          * create a new one.
 221          */
 222         if (ev == NULL) {
 223                 ev = event_context_find(mem_ctx);
 224                 if (ev == NULL) {
 225                         new_ev = event_context_init(mem_ctx);
 226                         if (new_ev == NULL) return NULL;
 227                         ev = new_ev;
 228                 }
 229         }
 230
 231         /* composite context allocation and setup */
 232         c = composite_create(mem_ctx, ev);
 233         if (c == NULL) {
 234                 talloc_free(new_ev);
 235                 return NULL;
 236         }
 237         talloc_steal(c, new_ev);
 238
 239         s = talloc_zero(c, struct epm_map_binding_state);
 240         if (composite_nomem(s, c)) return c;
 241         c->private_data = s;
 242
 243         s->binding = binding;
 244         s->table   = table;
 245
 246         /* anonymous credentials for rpc connection used to get endpoint mapping */
 247         anon_creds = cli_credentials_init(mem_ctx);
 248         cli_credentials_set_anonymous(anon_creds);
 249
 250         /*
 251           First, check if there is a default endpoint specified in the IDL
 252         */
 253         if (table != NULL) {
 254                 struct dcerpc_binding *default_binding;
 255
 256                 /* Find one of the default pipes for this interface */
 257                 for (i = 0; i < table->endpoints->count; i++) {
 258                         status = dcerpc_parse_binding(mem_ctx, table->endpoints->names[i], &default_binding);
 259
 260                         if (NT_STATUS_IS_OK(status)) {
 261                                 if (binding->transport == NCA_UNKNOWN)
 262                                         binding->transport = default_binding->transport;
 263                                 if (default_binding->transport == binding->transport &&
 264                                         default_binding->endpoint) {
 265                                         binding->endpoint = talloc_reference(binding, default_binding->endpoint);
 266                                         talloc_free(default_binding);
 267
 268                                         composite_done(c);
 269                                         return c;
 270
 271                                 } else {
 272                                         talloc_free(default_binding);
 273                                 }
 274                         }
 275                 }
 276         }
 277
 278         epmapper_binding = talloc_zero(c, struct dcerpc_binding);
 279         if (composite_nomem(epmapper_binding, c)) return c;
 280
 281         /* basic endpoint mapping data */
 282         epmapper_binding->transport             = binding->transport;
 283         epmapper_binding->host                  = talloc_reference(epmapper_binding, binding->host);
 284         epmapper_binding->target_hostname       = epmapper_binding->host;
 285         epmapper_binding->options               = NULL;
 286         epmapper_binding->flags                 = 0;
 287         epmapper_binding->assoc_group_id        = 0;
 288         epmapper_binding->endpoint              = NULL;
 289
 290         /* initiate rpc pipe connection */
 291         pipe_connect_req = dcerpc_pipe_connect_b_send(c, epmapper_binding,
 292                                                       &ndr_table_epmapper,
 293                                                       anon_creds, c->event_ctx,
 294                                                       lp_ctx);
 295         if (composite_nomem(pipe_connect_req, c)) return c;
 296
 297         composite_continue(c, pipe_connect_req, continue_epm_recv_binding, c);
 298         return c;
 299 }
 300
 301
 302 /*
 303   Receive result of endpoint mapping request
 304  */
 305 NTSTATUS dcerpc_epm_map_binding_recv(struct composite_context *c)
 306 {
 307         NTSTATUS status = composite_wait(c);
 308
 309         talloc_free(c);
 310         return status;
 311 }
 312
 313
 314 /*
 315   Get endpoint mapping for rpc connection
 316 */
 317 _PUBLIC_ NTSTATUS dcerpc_epm_map_binding(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding,
 318                                 const struct ndr_interface_table *table, struct event_context *ev,
 319                                 struct loadparm_context *lp_ctx)
 320 {
 321         struct composite_context *c;
 322
 323         c = dcerpc_epm_map_binding_send(mem_ctx, binding, table, ev, lp_ctx);
 324         return dcerpc_epm_map_binding_recv(c);
 325 }
 326
 327
 328 struct pipe_auth_state {
 329         struct dcerpc_pipe *pipe;
 330         struct dcerpc_binding *binding;
 331         const struct ndr_interface_table *table;
 332         struct loadparm_context *lp_ctx;
 333         struct cli_credentials *credentials;
 334 };
 335
 336
 337 static void continue_auth_schannel(struct composite_context *ctx);
 338 static void continue_auth(struct composite_context *ctx);
 339 static void continue_auth_none(struct composite_context *ctx);
 340 static void continue_ntlmssp_connection(struct composite_context *ctx);
 341 static void continue_spnego_after_wrong_pass(struct composite_context *ctx);
 342
 343
 344 /*
 345   Stage 2 of pipe_auth: Receive result of schannel bind request
 346 */
 347 static void continue_auth_schannel(struct composite_context *ctx)
 348 {
 349         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 350                                                       struct composite_context);
 351
 352         c->status = dcerpc_bind_auth_schannel_recv(ctx);
 353         if (!composite_is_ok(c)) return;
 354
 355         composite_done(c);
 356 }
 357
 358
 359 /*
 360   Stage 2 of pipe_auth: Receive result of authenticated bind request
 361 */
 362 static void continue_auth(struct composite_context *ctx)
 363 {
 364         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 365                                                       struct composite_context);
 366
 367         c->status = dcerpc_bind_auth_recv(ctx);
 368         if (!composite_is_ok(c)) return;
 369
 370         composite_done(c);
 371 }
 372 /*
 373   Stage 2 of pipe_auth: Receive result of authenticated bind request, but handle fallbacks:
 374   SPNEGO -> NTLMSSP
 375 */
 376 static void continue_auth_auto(struct composite_context *ctx)
 377 {
 378         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 379                                                       struct composite_context);
 380         struct pipe_auth_state *s = talloc_get_type(c->private_data, struct pipe_auth_state);
 381         struct composite_context *sec_conn_req;
 382
 383         c->status = dcerpc_bind_auth_recv(ctx);
 384         if (NT_STATUS_EQUAL(c->status, NT_STATUS_INVALID_PARAMETER)) {
 385                 /*
 386                  * Retry with NTLMSSP auth as fallback
 387                  * send a request for secondary rpc connection
 388                  */
 389                 sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 390                                                                 s->binding);
 391                 composite_continue(c, sec_conn_req, continue_ntlmssp_connection, c);
 392                 return;
 393         } else if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
 394                 if (cli_credentials_wrong_password(s->credentials)) {
 395                         /*
 396                          * Retry SPNEGO with a better password
 397                          * send a request for secondary rpc connection
 398                          */
 399                         sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 400                                                                         s->binding);
 401                         composite_continue(c, sec_conn_req, continue_spnego_after_wrong_pass, c);
 402                         return;
 403                 }
 404         }
 405
 406         if (!composite_is_ok(c)) return;
 407
 408         composite_done(c);
 409 }
 410
 411 /*
 412   Stage 3 of pipe_auth (fallback to NTLMSSP case): Receive secondary
 413   rpc connection (the first one can't be used any more, due to the
 414   bind nak) and perform authenticated bind request
 415 */
 416 static void continue_ntlmssp_connection(struct composite_context *ctx)
 417 {
 418         struct composite_context *c;
 419         struct pipe_auth_state *s;
 420         struct composite_context *auth_req;
 421         struct dcerpc_pipe *p2;
 422
 423         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 424         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 425
 426         /* receive secondary rpc connection */
 427         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 428         if (!composite_is_ok(c)) return;
 429
 430         talloc_steal(s, p2);
 431         talloc_steal(p2, s->pipe);
 432         s->pipe = p2;
 433
 434         /* initiate a authenticated bind */
 435         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 436                                          s->credentials, s->lp_ctx,
 437                                          DCERPC_AUTH_TYPE_NTLMSSP,
 438                                          dcerpc_auth_level(s->pipe->conn),
 439                                          s->table->authservices->names[0]);
 440         composite_continue(c, auth_req, continue_auth, c);
 441 }
 442
 443 /*
 444   Stage 3 of pipe_auth (retry on wrong password): Receive secondary
 445   rpc connection (the first one can't be used any more, due to the
 446   bind nak) and perform authenticated bind request
 447 */
 448 static void continue_spnego_after_wrong_pass(struct composite_context *ctx)
 449 {
 450         struct composite_context *c;
 451         struct pipe_auth_state *s;
 452         struct composite_context *auth_req;
 453         struct dcerpc_pipe *p2;
 454
 455         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 456         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 457
 458         /* receive secondary rpc connection */
 459         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 460         if (!composite_is_ok(c)) return;
 461
 462         talloc_steal(s, p2);
 463         talloc_steal(p2, s->pipe);
 464         s->pipe = p2;
 465
 466         /* initiate a authenticated bind */
 467         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 468                                          s->credentials, s->lp_ctx, DCERPC_AUTH_TYPE_SPNEGO,
 469                                          dcerpc_auth_level(s->pipe->conn),
 470                                          s->table->authservices->names[0]);
 471         composite_continue(c, auth_req, continue_auth, c);
 472 }
 473
 474
 475 /*
 476   Stage 2 of pipe_auth: Receive result of non-authenticated bind request
 477 */
 478 static void continue_auth_none(struct composite_context *ctx)
 479 {
 480         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 481                                                       struct composite_context);
 482
 483         c->status = dcerpc_bind_auth_none_recv(ctx);
 484         if (!composite_is_ok(c)) return;
 485
 486         composite_done(c);
 487 }
 488
 489
 490 /*
 491   Request to perform an authenticated bind if required. Authentication
 492   is determined using credentials passed and binding flags.
 493 */
 494 struct composite_context *dcerpc_pipe_auth_send(struct dcerpc_pipe *p,
 495                                                 struct dcerpc_binding *binding,
 496                                                 const struct ndr_interface_table *table,
 497                                                 struct cli_credentials *credentials,
 498                                                 struct loadparm_context *lp_ctx)
 499 {
 500         struct composite_context *c;
 501         struct pipe_auth_state *s;
 502         struct composite_context *auth_schannel_req;
 503         struct composite_context *auth_req;
 504         struct composite_context *auth_none_req;
 505         struct dcerpc_connection *conn;
 506         uint8_t auth_type;
 507
 508         /* composite context allocation and setup */
 509         c = composite_create(p, p->conn->event_ctx);
 510         if (c == NULL) return NULL;
 511
 512         s = talloc_zero(c, struct pipe_auth_state);
 513         if (composite_nomem(s, c)) return c;
 514         c->private_data = s;
 515
 516         /* store parameters in state structure */
 517         s->binding      = binding;
 518         s->table        = table;
 519         s->credentials  = credentials;
 520         s->pipe         = p;
 521         s->lp_ctx       = lp_ctx;
 522
 523         conn = s->pipe->conn;
 524         conn->flags = binding->flags;
 525
 526         /* remember the binding string for possible secondary connections */
 527         conn->binding_string = dcerpc_binding_string(p, binding);
 528
 529         if (cli_credentials_is_anonymous(s->credentials)) {
 530                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 531                 composite_continue(c, auth_none_req, continue_auth_none, c);
 532                 return c;
 533         }
 534
 535         if ((binding->flags & DCERPC_SCHANNEL) &&
 536             !cli_credentials_get_netlogon_creds(s->credentials)) {
 537                 /* If we don't already have netlogon credentials for
 538                  * the schannel bind, then we have to get these
 539                  * first */
 540                 auth_schannel_req = dcerpc_bind_auth_schannel_send(c, s->pipe, s->table,
 541                                                                    s->credentials, s->lp_ctx,
 542                                                                    dcerpc_auth_level(conn));
 543                 composite_continue(c, auth_schannel_req, continue_auth_schannel, c);
 544                 return c;
 545         }
 546
 547         /*
 548          * we rely on the already authenticated CIFS connection
 549          * if not doing sign or seal
 550          */
 551         if (conn->transport.transport == NCACN_NP &&
 552             !(s->binding->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 553                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 554                 composite_continue(c, auth_none_req, continue_auth_none, c);
 555                 return c;
 556         }
 557
 558
 559         /* Perform an authenticated DCE-RPC bind
 560          */
 561         if (!(conn->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 562                 /*
 563                   we are doing an authenticated connection,
 564                   but not using sign or seal. We must force
 565                   the CONNECT dcerpc auth type as a NONE auth
 566                   type doesn't allow authentication
 567                   information to be passed.
 568                 */
 569                 conn->flags |= DCERPC_CONNECT;
 570         }
 571
 572         if (s->binding->flags & DCERPC_AUTH_SPNEGO) {
 573                 auth_type = DCERPC_AUTH_TYPE_SPNEGO;
 574
 575         } else if (s->binding->flags & DCERPC_AUTH_KRB5) {
 576                 auth_type = DCERPC_AUTH_TYPE_KRB5;
 577
 578         } else if (s->binding->flags & DCERPC_SCHANNEL) {
 579                 auth_type = DCERPC_AUTH_TYPE_SCHANNEL;
 580
 581         } else if (s->binding->flags & DCERPC_AUTH_NTLM) {
 582                 auth_type = DCERPC_AUTH_TYPE_NTLMSSP;
 583
 584         } else {
 585                 /* try SPNEGO with fallback to NTLMSSP */
 586                 auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 587                                                  s->credentials, s->lp_ctx, DCERPC_AUTH_TYPE_SPNEGO,
 588                                                  dcerpc_auth_level(conn),
 589                                                  s->table->authservices->names[0]);
 590                 composite_continue(c, auth_req, continue_auth_auto, c);
 591                 return c;
 592         }
 593
 594         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 595                                          s->credentials, s->lp_ctx, auth_type,
 596                                          dcerpc_auth_level(conn),
 597                                          s->table->authservices->names[0]);
 598         composite_continue(c, auth_req, continue_auth, c);
 599         return c;
 600 }
 601
 602
 603 /*
 604   Receive result of authenticated bind request on dcerpc pipe
 605
 606   This returns *p, which may be different to the one originally
 607   supllied, as it rebinds to a new pipe due to authentication fallback
 608
 609 */
 610 NTSTATUS dcerpc_pipe_auth_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 611                                struct dcerpc_pipe **p)
 612 {
 613         NTSTATUS status;
 614
 615         struct pipe_auth_state *s = talloc_get_type(c->private_data,
 616                                                     struct pipe_auth_state);
 617         status = composite_wait(c);
 618         if (!NT_STATUS_IS_OK(status)) {
 619                 char *uuid_str = GUID_string(s->pipe, &s->table->syntax_id.uuid);
 620                 DEBUG(0, ("Failed to bind to uuid %s - %s\n", uuid_str, nt_errstr(status)));
 621                 talloc_free(uuid_str);
 622         } else {
 623                 talloc_steal(mem_ctx, s->pipe);
 624                 *p = s->pipe;
 625         }
 626
 627         talloc_free(c);
 628         return status;
 629 }
 630
 631
 632 /*
 633    Perform an authenticated bind if needed - sync version
 634
 635    This may change *p, as it rebinds to a new pipe due to authentication fallback
 636 */
 637 _PUBLIC_ NTSTATUS dcerpc_pipe_auth(TALLOC_CTX *mem_ctx,
 638                           struct dcerpc_pipe **p,
 639                           struct dcerpc_binding *binding,
 640                           const struct ndr_interface_table *table,
 641                           struct cli_credentials *credentials,
 642                           struct loadparm_context *lp_ctx)
 643 {
 644         struct composite_context *c;
 645
 646         c = dcerpc_pipe_auth_send(*p, binding, table, credentials, lp_ctx);
 647         return dcerpc_pipe_auth_recv(c, mem_ctx, p);
 648 }
 649
 650
 651 NTSTATUS dcerpc_generic_session_key(struct dcerpc_connection *c,
 652                                     DATA_BLOB *session_key)
 653 {
 654         /* this took quite a few CPU cycles to find ... */
 655         session_key->data = discard_const_p(unsigned char, "SystemLibraryDTC");
 656         session_key->length = 16;
 657         return NT_STATUS_OK;
 658 }
 659
 660 /*
 661   fetch the user session key - may be default (above) or the SMB session key
 662 */
 663 _PUBLIC_ NTSTATUS dcerpc_fetch_session_key(struct dcerpc_pipe *p,
 664                                   DATA_BLOB *session_key)
 665 {
 666         return p->conn->security_state.session_key(p->conn, session_key);
 667 }
 668
 669
 670 /*
 671   log a rpc packet in a format suitable for ndrdump. This is especially useful
 672   for sealed packets, where ethereal cannot easily see the contents
 673
 674   this triggers on a debug level of >= 10
 675 */
 676 _PUBLIC_ void dcerpc_log_packet(const struct ndr_interface_table *ndr,
 677                        uint32_t opnum, uint32_t flags,
 678                        DATA_BLOB *pkt)
 679 {
 680         const int num_examples = 20;
 681         int i;
 682
 683         if (DEBUGLEVEL < 10) return;
 684
 685         for (i=0;i<num_examples;i++) {
 686                 char *name=NULL;
 687                 asprintf(&name, "%s/rpclog/%s-%u.%d.%s",
 688                          lp_lockdir(global_loadparm), ndr->name, opnum, i,
 689                          (flags&NDR_IN)?"in":"out");
 690                 if (name == NULL) {
 691                         return;
 692                 }
 693                 if (!file_exist(name)) {
 694                         if (file_save(name, pkt->data, pkt->length)) {
 695                                 DEBUG(10,("Logged rpc packet to %s\n", name));
 696                         }
 697                         free(name);
 698                         break;
 699                 }
 700                 free(name);
 701         }
 702 }
 703
 704
 705
 706 /*
 707   create a secondary context from a primary connection
 708
 709   this uses dcerpc_alter_context() to create a new dcerpc context_id
 710 */
 711 _PUBLIC_ NTSTATUS dcerpc_secondary_context(struct dcerpc_pipe *p,
 712                                   struct dcerpc_pipe **pp2,
 713                                   const struct ndr_interface_table *table)
 714 {
 715         NTSTATUS status;
 716         struct dcerpc_pipe *p2;
 717
 718         p2 = talloc_zero(p, struct dcerpc_pipe);
 719         if (p2 == NULL) {
 720                 return NT_STATUS_NO_MEMORY;
 721         }
 722         p2->conn = talloc_reference(p2, p->conn);
 723         p2->request_timeout = p->request_timeout;
 724
 725         p2->context_id = ++p->conn->next_context_id;
 726
 727         p2->syntax = table->syntax_id;
 728
 729         p2->transfer_syntax = ndr_transfer_syntax;
 730
 731         p2->binding = talloc_reference(p2, p->binding);
 732
 733         status = dcerpc_alter_context(p2, p2, &p2->syntax, &p2->transfer_syntax);
 734         if (!NT_STATUS_IS_OK(status)) {
 735                 talloc_free(p2);
 736                 return status;
 737         }
 738
 739         *pp2 = p2;
 740
 741         return NT_STATUS_OK;
 742 }