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 tevent_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
 213         NTSTATUS status;
 214         struct dcerpc_binding *epmapper_binding;
 215         int i;
 216
 217         if (ev == NULL) {
 218                 return NULL;
 219         }
 220
 221         /* composite context allocation and setup */
 222         c = composite_create(mem_ctx, ev);
 223         if (c == NULL) {
 224                 return NULL;
 225         }
 226
 227         s = talloc_zero(c, struct epm_map_binding_state);
 228         if (composite_nomem(s, c)) return c;
 229         c->private_data = s;
 230
 231         s->binding = binding;
 232         s->table   = table;
 233
 234         /* anonymous credentials for rpc connection used to get endpoint mapping */
 235         anon_creds = cli_credentials_init(mem_ctx);
 236         cli_credentials_set_anonymous(anon_creds);
 237
 238         /*
 239           First, check if there is a default endpoint specified in the IDL
 240         */
 241         if (table != NULL) {
 242                 struct dcerpc_binding *default_binding;
 243
 244                 /* Find one of the default pipes for this interface */
 245                 for (i = 0; i < table->endpoints->count; i++) {
 246                         status = dcerpc_parse_binding(mem_ctx, table->endpoints->names[i], &default_binding);
 247
 248                         if (NT_STATUS_IS_OK(status)) {
 249                                 if (binding->transport == NCA_UNKNOWN)
 250                                         binding->transport = default_binding->transport;
 251                                 if (default_binding->transport == binding->transport &&
 252                                         default_binding->endpoint) {
 253                                         binding->endpoint = talloc_reference(binding, default_binding->endpoint);
 254                                         talloc_free(default_binding);
 255
 256                                         composite_done(c);
 257                                         return c;
 258
 259                                 } else {
 260                                         talloc_free(default_binding);
 261                                 }
 262                         }
 263                 }
 264         }
 265
 266         epmapper_binding = talloc_zero(c, struct dcerpc_binding);
 267         if (composite_nomem(epmapper_binding, c)) return c;
 268
 269         /* basic endpoint mapping data */
 270         epmapper_binding->transport             = binding->transport;
 271         epmapper_binding->host                  = talloc_reference(epmapper_binding, binding->host);
 272         epmapper_binding->target_hostname       = epmapper_binding->host;
 273         epmapper_binding->options               = NULL;
 274         epmapper_binding->flags                 = 0;
 275         epmapper_binding->assoc_group_id        = 0;
 276         epmapper_binding->endpoint              = NULL;
 277
 278         /* initiate rpc pipe connection */
 279         pipe_connect_req = dcerpc_pipe_connect_b_send(c, epmapper_binding,
 280                                                       &ndr_table_epmapper,
 281                                                       anon_creds, c->event_ctx,
 282                                                       lp_ctx);
 283         if (composite_nomem(pipe_connect_req, c)) return c;
 284
 285         composite_continue(c, pipe_connect_req, continue_epm_recv_binding, c);
 286         return c;
 287 }
 288
 289
 290 /*
 291   Receive result of endpoint mapping request
 292  */
 293 NTSTATUS dcerpc_epm_map_binding_recv(struct composite_context *c)
 294 {
 295         NTSTATUS status = composite_wait(c);
 296
 297         talloc_free(c);
 298         return status;
 299 }
 300
 301
 302 /*
 303   Get endpoint mapping for rpc connection
 304 */
 305 _PUBLIC_ NTSTATUS dcerpc_epm_map_binding(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding,
 306                                 const struct ndr_interface_table *table, struct tevent_context *ev,
 307                                 struct loadparm_context *lp_ctx)
 308 {
 309         struct composite_context *c;
 310
 311         c = dcerpc_epm_map_binding_send(mem_ctx, binding, table, ev, lp_ctx);
 312         return dcerpc_epm_map_binding_recv(c);
 313 }
 314
 315
 316 struct pipe_auth_state {
 317         struct dcerpc_pipe *pipe;
 318         struct dcerpc_binding *binding;
 319         const struct ndr_interface_table *table;
 320         struct loadparm_context *lp_ctx;
 321         struct cli_credentials *credentials;
 322 };
 323
 324
 325 static void continue_auth_schannel(struct composite_context *ctx);
 326 static void continue_auth(struct composite_context *ctx);
 327 static void continue_auth_none(struct composite_context *ctx);
 328 static void continue_ntlmssp_connection(struct composite_context *ctx);
 329 static void continue_spnego_after_wrong_pass(struct composite_context *ctx);
 330
 331
 332 /*
 333   Stage 2 of pipe_auth: Receive result of schannel bind request
 334 */
 335 static void continue_auth_schannel(struct composite_context *ctx)
 336 {
 337         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 338                                                       struct composite_context);
 339
 340         c->status = dcerpc_bind_auth_schannel_recv(ctx);
 341         if (!composite_is_ok(c)) return;
 342
 343         composite_done(c);
 344 }
 345
 346
 347 /*
 348   Stage 2 of pipe_auth: Receive result of authenticated bind request
 349 */
 350 static void continue_auth(struct composite_context *ctx)
 351 {
 352         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 353                                                       struct composite_context);
 354
 355         c->status = dcerpc_bind_auth_recv(ctx);
 356         if (!composite_is_ok(c)) return;
 357
 358         composite_done(c);
 359 }
 360 /*
 361   Stage 2 of pipe_auth: Receive result of authenticated bind request, but handle fallbacks:
 362   SPNEGO -> NTLMSSP
 363 */
 364 static void continue_auth_auto(struct composite_context *ctx)
 365 {
 366         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 367                                                       struct composite_context);
 368         struct pipe_auth_state *s = talloc_get_type(c->private_data, struct pipe_auth_state);
 369         struct composite_context *sec_conn_req;
 370
 371         c->status = dcerpc_bind_auth_recv(ctx);
 372         if (NT_STATUS_EQUAL(c->status, NT_STATUS_INVALID_PARAMETER)) {
 373                 /*
 374                  * Retry with NTLMSSP auth as fallback
 375                  * send a request for secondary rpc connection
 376                  */
 377                 sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 378                                                                 s->binding);
 379                 composite_continue(c, sec_conn_req, continue_ntlmssp_connection, c);
 380                 return;
 381         } else if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
 382                 if (cli_credentials_wrong_password(s->credentials)) {
 383                         /*
 384                          * Retry SPNEGO with a better password
 385                          * send a request for secondary rpc connection
 386                          */
 387                         sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 388                                                                         s->binding);
 389                         composite_continue(c, sec_conn_req, continue_spnego_after_wrong_pass, c);
 390                         return;
 391                 }
 392         }
 393
 394         if (!composite_is_ok(c)) return;
 395
 396         composite_done(c);
 397 }
 398
 399 /*
 400   Stage 3 of pipe_auth (fallback to NTLMSSP case): Receive secondary
 401   rpc connection (the first one can't be used any more, due to the
 402   bind nak) and perform authenticated bind request
 403 */
 404 static void continue_ntlmssp_connection(struct composite_context *ctx)
 405 {
 406         struct composite_context *c;
 407         struct pipe_auth_state *s;
 408         struct composite_context *auth_req;
 409         struct dcerpc_pipe *p2;
 410
 411         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 412         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 413
 414         /* receive secondary rpc connection */
 415         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 416         if (!composite_is_ok(c)) return;
 417
 418         talloc_steal(s, p2);
 419         talloc_steal(p2, s->pipe);
 420         s->pipe = p2;
 421
 422         /* initiate a authenticated bind */
 423         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 424                                          s->credentials,
 425                                          lp_gensec_settings(c, s->lp_ctx),
 426                                          DCERPC_AUTH_TYPE_NTLMSSP,
 427                                          dcerpc_auth_level(s->pipe->conn),
 428                                          s->table->authservices->names[0]);
 429         composite_continue(c, auth_req, continue_auth, c);
 430 }
 431
 432 /*
 433   Stage 3 of pipe_auth (retry on wrong password): Receive secondary
 434   rpc connection (the first one can't be used any more, due to the
 435   bind nak) and perform authenticated bind request
 436 */
 437 static void continue_spnego_after_wrong_pass(struct composite_context *ctx)
 438 {
 439         struct composite_context *c;
 440         struct pipe_auth_state *s;
 441         struct composite_context *auth_req;
 442         struct dcerpc_pipe *p2;
 443
 444         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 445         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 446
 447         /* receive secondary rpc connection */
 448         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 449         if (!composite_is_ok(c)) return;
 450
 451         talloc_steal(s, p2);
 452         talloc_steal(p2, s->pipe);
 453         s->pipe = p2;
 454
 455         /* initiate a authenticated bind */
 456         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 457                                          s->credentials,
 458                                          lp_gensec_settings(c, s->lp_ctx),
 459                                          DCERPC_AUTH_TYPE_SPNEGO,
 460                                          dcerpc_auth_level(s->pipe->conn),
 461                                          s->table->authservices->names[0]);
 462         composite_continue(c, auth_req, continue_auth, c);
 463 }
 464
 465
 466 /*
 467   Stage 2 of pipe_auth: Receive result of non-authenticated bind request
 468 */
 469 static void continue_auth_none(struct composite_context *ctx)
 470 {
 471         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 472                                                       struct composite_context);
 473
 474         c->status = dcerpc_bind_auth_none_recv(ctx);
 475         if (!composite_is_ok(c)) return;
 476
 477         composite_done(c);
 478 }
 479
 480
 481 /*
 482   Request to perform an authenticated bind if required. Authentication
 483   is determined using credentials passed and binding flags.
 484 */
 485 struct composite_context *dcerpc_pipe_auth_send(struct dcerpc_pipe *p,
 486                                                 struct dcerpc_binding *binding,
 487                                                 const struct ndr_interface_table *table,
 488                                                 struct cli_credentials *credentials,
 489                                                 struct loadparm_context *lp_ctx)
 490 {
 491         struct composite_context *c;
 492         struct pipe_auth_state *s;
 493         struct composite_context *auth_schannel_req;
 494         struct composite_context *auth_req;
 495         struct composite_context *auth_none_req;
 496         struct dcerpc_connection *conn;
 497         uint8_t auth_type;
 498
 499         /* composite context allocation and setup */
 500         c = composite_create(p, p->conn->event_ctx);
 501         if (c == NULL) return NULL;
 502
 503         s = talloc_zero(c, struct pipe_auth_state);
 504         if (composite_nomem(s, c)) return c;
 505         c->private_data = s;
 506
 507         /* store parameters in state structure */
 508         s->binding      = binding;
 509         s->table        = table;
 510         s->credentials  = credentials;
 511         s->pipe         = p;
 512         s->lp_ctx       = lp_ctx;
 513
 514         conn = s->pipe->conn;
 515         conn->flags = binding->flags;
 516
 517         if (DEBUGLVL(100)) {
 518                 conn->flags |= DCERPC_DEBUG_PRINT_BOTH;
 519         }
 520
 521         /* remember the binding string for possible secondary connections */
 522         conn->binding_string = dcerpc_binding_string(p, binding);
 523
 524         if (cli_credentials_is_anonymous(s->credentials)) {
 525                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 526                 composite_continue(c, auth_none_req, continue_auth_none, c);
 527                 return c;
 528         }
 529
 530         if ((binding->flags & DCERPC_SCHANNEL) &&
 531             !cli_credentials_get_netlogon_creds(s->credentials)) {
 532                 /* If we don't already have netlogon credentials for
 533                  * the schannel bind, then we have to get these
 534                  * first */
 535                 auth_schannel_req = dcerpc_bind_auth_schannel_send(c, s->pipe, s->table,
 536                                                                    s->credentials, s->lp_ctx,
 537                                                                    dcerpc_auth_level(conn));
 538                 composite_continue(c, auth_schannel_req, continue_auth_schannel, c);
 539                 return c;
 540         }
 541
 542         /*
 543          * we rely on the already authenticated CIFS connection
 544          * if not doing sign or seal
 545          */
 546         if (conn->transport.transport == NCACN_NP &&
 547             !(s->binding->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 548                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 549                 composite_continue(c, auth_none_req, continue_auth_none, c);
 550                 return c;
 551         }
 552
 553
 554         /* Perform an authenticated DCE-RPC bind
 555          */
 556         if (!(conn->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 557                 /*
 558                   we are doing an authenticated connection,
 559                   but not using sign or seal. We must force
 560                   the CONNECT dcerpc auth type as a NONE auth
 561                   type doesn't allow authentication
 562                   information to be passed.
 563                 */
 564                 conn->flags |= DCERPC_CONNECT;
 565         }
 566
 567         if (s->binding->flags & DCERPC_AUTH_SPNEGO) {
 568                 auth_type = DCERPC_AUTH_TYPE_SPNEGO;
 569
 570         } else if (s->binding->flags & DCERPC_AUTH_KRB5) {
 571                 auth_type = DCERPC_AUTH_TYPE_KRB5;
 572
 573         } else if (s->binding->flags & DCERPC_SCHANNEL) {
 574                 auth_type = DCERPC_AUTH_TYPE_SCHANNEL;
 575
 576         } else if (s->binding->flags & DCERPC_AUTH_NTLM) {
 577                 auth_type = DCERPC_AUTH_TYPE_NTLMSSP;
 578
 579         } else {
 580                 /* try SPNEGO with fallback to NTLMSSP */
 581                 auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 582                                                  s->credentials,
 583                                                  lp_gensec_settings(c, s->lp_ctx),
 584                                                  DCERPC_AUTH_TYPE_SPNEGO,
 585                                                  dcerpc_auth_level(conn),
 586                                                  s->table->authservices->names[0]);
 587                 composite_continue(c, auth_req, continue_auth_auto, c);
 588                 return c;
 589         }
 590
 591         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 592                                          s->credentials,
 593                                          lp_gensec_settings(c, s->lp_ctx),
 594                                          auth_type,
 595                                          dcerpc_auth_level(conn),
 596                                          s->table->authservices->names[0]);
 597         composite_continue(c, auth_req, continue_auth, c);
 598         return c;
 599 }
 600
 601
 602 /*
 603   Receive result of authenticated bind request on dcerpc pipe
 604
 605   This returns *p, which may be different to the one originally
 606   supllied, as it rebinds to a new pipe due to authentication fallback
 607
 608 */
 609 NTSTATUS dcerpc_pipe_auth_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 610                                struct dcerpc_pipe **p)
 611 {
 612         NTSTATUS status;
 613
 614         struct pipe_auth_state *s = talloc_get_type(c->private_data,
 615                                                     struct pipe_auth_state);
 616         status = composite_wait(c);
 617         if (!NT_STATUS_IS_OK(status)) {
 618                 char *uuid_str = GUID_string(s->pipe, &s->table->syntax_id.uuid);
 619                 DEBUG(0, ("Failed to bind to uuid %s - %s\n", uuid_str, nt_errstr(status)));
 620                 talloc_free(uuid_str);
 621         } else {
 622                 talloc_steal(mem_ctx, s->pipe);
 623                 *p = s->pipe;
 624         }
 625
 626         talloc_free(c);
 627         return status;
 628 }
 629
 630
 631 /*
 632    Perform an authenticated bind if needed - sync version
 633
 634    This may change *p, as it rebinds to a new pipe due to authentication fallback
 635 */
 636 _PUBLIC_ NTSTATUS dcerpc_pipe_auth(TALLOC_CTX *mem_ctx,
 637                           struct dcerpc_pipe **p,
 638                           struct dcerpc_binding *binding,
 639                           const struct ndr_interface_table *table,
 640                           struct cli_credentials *credentials,
 641                           struct loadparm_context *lp_ctx)
 642 {
 643         struct composite_context *c;
 644
 645         c = dcerpc_pipe_auth_send(*p, binding, table, credentials, lp_ctx);
 646         return dcerpc_pipe_auth_recv(c, mem_ctx, p);
 647 }
 648
 649
 650 NTSTATUS dcerpc_generic_session_key(struct dcerpc_connection *c,
 651                                     DATA_BLOB *session_key)
 652 {
 653         /* this took quite a few CPU cycles to find ... */
 654         session_key->data = discard_const_p(unsigned char, "SystemLibraryDTC");
 655         session_key->length = 16;
 656         return NT_STATUS_OK;
 657 }
 658
 659 /*
 660   fetch the user session key - may be default (above) or the SMB session key
 661
 662   The key is always truncated to 16 bytes
 663 */
 664 _PUBLIC_ NTSTATUS dcerpc_fetch_session_key(struct dcerpc_pipe *p,
 665                                            DATA_BLOB *session_key)
 666 {
 667         NTSTATUS status;
 668         status = p->conn->security_state.session_key(p->conn, session_key);
 669         if (!NT_STATUS_IS_OK(status)) {
 670                 return status;
 671         }
 672
 673         session_key->length = MIN(session_key->length, 16);
 674
 675         return NT_STATUS_OK;
 676 }
 677
 678
 679 /*
 680   log a rpc packet in a format suitable for ndrdump. This is especially useful
 681   for sealed packets, where ethereal cannot easily see the contents
 682
 683   this triggers on a debug level of >= 10
 684 */
 685 _PUBLIC_ void dcerpc_log_packet(const char *lockdir,
 686                                                                 const struct ndr_interface_table *ndr,
 687                        uint32_t opnum, uint32_t flags,
 688                        DATA_BLOB *pkt)
 689 {
 690         const int num_examples = 20;
 691         int i;
 692
 693         if (lockdir == NULL) return;
 694
 695         for (i=0;i<num_examples;i++) {
 696                 char *name=NULL;
 697                 asprintf(&name, "%s/rpclog/%s-%u.%d.%s",
 698                          lockdir, ndr->name, opnum, i,
 699                          (flags&NDR_IN)?"in":"out");
 700                 if (name == NULL) {
 701                         return;
 702                 }
 703                 if (!file_exist(name)) {
 704                         if (file_save(name, pkt->data, pkt->length)) {
 705                                 DEBUG(10,("Logged rpc packet to %s\n", name));
 706                         }
 707                         free(name);
 708                         break;
 709                 }
 710                 free(name);
 711         }
 712 }
 713
 714
 715
 716 /*
 717   create a secondary context from a primary connection
 718
 719   this uses dcerpc_alter_context() to create a new dcerpc context_id
 720 */
 721 _PUBLIC_ NTSTATUS dcerpc_secondary_context(struct dcerpc_pipe *p,
 722                                   struct dcerpc_pipe **pp2,
 723                                   const struct ndr_interface_table *table)
 724 {
 725         NTSTATUS status;
 726         struct dcerpc_pipe *p2;
 727
 728         p2 = talloc_zero(p, struct dcerpc_pipe);
 729         if (p2 == NULL) {
 730                 return NT_STATUS_NO_MEMORY;
 731         }
 732         p2->conn = talloc_reference(p2, p->conn);
 733         p2->request_timeout = p->request_timeout;
 734
 735         p2->context_id = ++p->conn->next_context_id;
 736
 737         p2->syntax = table->syntax_id;
 738
 739         p2->transfer_syntax = p->transfer_syntax;
 740
 741         p2->binding = talloc_reference(p2, p->binding);
 742
 743         status = dcerpc_alter_context(p2, p2, &p2->syntax, &p2->transfer_syntax);
 744         if (!NT_STATUS_IS_OK(status)) {
 745                 talloc_free(p2);
 746                 return status;
 747         }
 748
 749         *pp2 = p2;
 750
 751         return NT_STATUS_OK;
 752 }