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                 uint32_t offset = ndr->offset;
  87                 ndr_err = ndr_push_align(ndr, 16);
  88                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  89                         return ndr_map_error2ntstatus(ndr_err);
  90                 }
  91                 auth_info->auth_pad_length = ndr->offset - offset;
  92                 ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, auth_info);
  93                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  94                         return ndr_map_error2ntstatus(ndr_err);
  95                 }
  96         }
  97
  98         *blob = ndr_push_blob(ndr);
  99
 100         /* fill in the frag length */
 101         dcerpc_set_frag_length(blob, blob->length);
 102
 103         return NT_STATUS_OK;
 104 }
 105
 106
 107 struct epm_map_binding_state {
 108         struct dcerpc_binding *binding;
 109         const struct ndr_interface_table *table;
 110         struct dcerpc_pipe *pipe;
 111         struct policy_handle handle;
 112         struct GUID guid;
 113         struct epm_twr_t twr;
 114         struct epm_twr_t *twr_r;
 115         struct epm_Map r;
 116 };
 117
 118
 119 static void continue_epm_recv_binding(struct composite_context *ctx);
 120 static void continue_epm_map(struct rpc_request *req);
 121
 122
 123 /*
 124   Stage 2 of epm_map_binding: Receive connected rpc pipe and send endpoint
 125   mapping rpc request
 126 */
 127 static void continue_epm_recv_binding(struct composite_context *ctx)
 128 {
 129         struct rpc_request *map_req;
 130
 131         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 132                                                       struct composite_context);
 133         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
 134                                                           struct epm_map_binding_state);
 135
 136         /* receive result of rpc pipe connect request */
 137         c->status = dcerpc_pipe_connect_b_recv(ctx, c, &s->pipe);
 138         if (!composite_is_ok(c)) return;
 139
 140         s->pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 141
 142         /* prepare requested binding parameters */
 143         s->binding->object         = s->table->syntax_id;
 144
 145         c->status = dcerpc_binding_build_tower(s->pipe, s->binding, &s->twr.tower);
 146         if (!composite_is_ok(c)) return;
 147
 148         /* with some nice pretty paper around it of course */
 149         s->r.in.object        = &s->guid;
 150         s->r.in.map_tower     = &s->twr;
 151         s->r.in.entry_handle  = &s->handle;
 152         s->r.in.max_towers    = 1;
 153         s->r.out.entry_handle = &s->handle;
 154
 155         /* send request for an endpoint mapping - a rpc request on connected pipe */
 156         map_req = dcerpc_epm_Map_send(s->pipe, c, &s->r);
 157         if (composite_nomem(map_req, c)) return;
 158
 159         composite_continue_rpc(c, map_req, continue_epm_map, c);
 160 }
 161
 162
 163 /*
 164   Stage 3 of epm_map_binding: Receive endpoint mapping and provide binding details
 165 */
 166 static void continue_epm_map(struct rpc_request *req)
 167 {
 168         struct composite_context *c = talloc_get_type(req->async.private_data,
 169                                                       struct composite_context);
 170         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
 171                                                           struct epm_map_binding_state);
 172
 173         /* receive result of a rpc request */
 174         c->status = dcerpc_ndr_request_recv(req);
 175         if (!composite_is_ok(c)) return;
 176
 177         /* check the details */
 178         if (s->r.out.result != 0 || *s->r.out.num_towers != 1) {
 179                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 180                 return;
 181         }
 182
 183         s->twr_r = s->r.out.towers[0].twr;
 184         if (s->twr_r == NULL) {
 185                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 186                 return;
 187         }
 188
 189         if (s->twr_r->tower.num_floors != s->twr.tower.num_floors ||
 190             s->twr_r->tower.floors[3].lhs.protocol != s->twr.tower.floors[3].lhs.protocol) {
 191                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 192                 return;
 193         }
 194
 195         /* get received endpoint */
 196         s->binding->endpoint = talloc_reference(s->binding,
 197                                                 dcerpc_floor_get_rhs_data(c, &s->twr_r->tower.floors[3]));
 198         if (composite_nomem(s->binding->endpoint, c)) return;
 199
 200         composite_done(c);
 201 }
 202
 203
 204 /*
 205   Request for endpoint mapping of dcerpc binding - try to request for endpoint
 206   unless there is default one.
 207 */
 208 struct composite_context *dcerpc_epm_map_binding_send(TALLOC_CTX *mem_ctx,
 209                                                       struct dcerpc_binding *binding,
 210                                                       const struct ndr_interface_table *table,
 211                                                       struct tevent_context *ev,
 212                                                       struct loadparm_context *lp_ctx)
 213 {
 214         struct composite_context *c;
 215         struct epm_map_binding_state *s;
 216         struct composite_context *pipe_connect_req;
 217         struct cli_credentials *anon_creds;
 218
 219         NTSTATUS status;
 220         struct dcerpc_binding *epmapper_binding;
 221         int i;
 222
 223         if (ev == NULL) {
 224                 return NULL;
 225         }
 226
 227         /* composite context allocation and setup */
 228         c = composite_create(mem_ctx, ev);
 229         if (c == NULL) {
 230                 return NULL;
 231         }
 232
 233         s = talloc_zero(c, struct epm_map_binding_state);
 234         if (composite_nomem(s, c)) return c;
 235         c->private_data = s;
 236
 237         s->binding = binding;
 238         s->table   = table;
 239
 240         /* anonymous credentials for rpc connection used to get endpoint mapping */
 241         anon_creds = cli_credentials_init(mem_ctx);
 242         cli_credentials_set_anonymous(anon_creds);
 243
 244         /*
 245           First, check if there is a default endpoint specified in the IDL
 246         */
 247         if (table != NULL) {
 248                 struct dcerpc_binding *default_binding;
 249
 250                 /* Find one of the default pipes for this interface */
 251                 for (i = 0; i < table->endpoints->count; i++) {
 252                         status = dcerpc_parse_binding(mem_ctx, table->endpoints->names[i], &default_binding);
 253
 254                         if (NT_STATUS_IS_OK(status)) {
 255                                 if (binding->transport == NCA_UNKNOWN)
 256                                         binding->transport = default_binding->transport;
 257                                 if (default_binding->transport == binding->transport &&
 258                                         default_binding->endpoint) {
 259                                         binding->endpoint = talloc_reference(binding, default_binding->endpoint);
 260                                         talloc_free(default_binding);
 261
 262                                         composite_done(c);
 263                                         return c;
 264
 265                                 } else {
 266                                         talloc_free(default_binding);
 267                                 }
 268                         }
 269                 }
 270         }
 271
 272         epmapper_binding = talloc_zero(c, struct dcerpc_binding);
 273         if (composite_nomem(epmapper_binding, c)) return c;
 274
 275         /* basic endpoint mapping data */
 276         epmapper_binding->transport             = binding->transport;
 277         epmapper_binding->host                  = talloc_reference(epmapper_binding, binding->host);
 278         epmapper_binding->target_hostname       = epmapper_binding->host;
 279         epmapper_binding->options               = NULL;
 280         epmapper_binding->flags                 = 0;
 281         epmapper_binding->assoc_group_id        = 0;
 282         epmapper_binding->endpoint              = NULL;
 283
 284         /* initiate rpc pipe connection */
 285         pipe_connect_req = dcerpc_pipe_connect_b_send(c, epmapper_binding,
 286                                                       &ndr_table_epmapper,
 287                                                       anon_creds, c->event_ctx,
 288                                                       lp_ctx);
 289         if (composite_nomem(pipe_connect_req, c)) return c;
 290
 291         composite_continue(c, pipe_connect_req, continue_epm_recv_binding, c);
 292         return c;
 293 }
 294
 295
 296 /*
 297   Receive result of endpoint mapping request
 298  */
 299 NTSTATUS dcerpc_epm_map_binding_recv(struct composite_context *c)
 300 {
 301         NTSTATUS status = composite_wait(c);
 302
 303         talloc_free(c);
 304         return status;
 305 }
 306
 307
 308 /*
 309   Get endpoint mapping for rpc connection
 310 */
 311 _PUBLIC_ NTSTATUS dcerpc_epm_map_binding(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding,
 312                                 const struct ndr_interface_table *table, struct tevent_context *ev,
 313                                 struct loadparm_context *lp_ctx)
 314 {
 315         struct composite_context *c;
 316
 317         c = dcerpc_epm_map_binding_send(mem_ctx, binding, table, ev, lp_ctx);
 318         return dcerpc_epm_map_binding_recv(c);
 319 }
 320
 321
 322 struct pipe_auth_state {
 323         struct dcerpc_pipe *pipe;
 324         struct dcerpc_binding *binding;
 325         const struct ndr_interface_table *table;
 326         struct loadparm_context *lp_ctx;
 327         struct cli_credentials *credentials;
 328 };
 329
 330
 331 static void continue_auth_schannel(struct composite_context *ctx);
 332 static void continue_auth(struct composite_context *ctx);
 333 static void continue_auth_none(struct composite_context *ctx);
 334 static void continue_ntlmssp_connection(struct composite_context *ctx);
 335 static void continue_spnego_after_wrong_pass(struct composite_context *ctx);
 336
 337
 338 /*
 339   Stage 2 of pipe_auth: Receive result of schannel bind request
 340 */
 341 static void continue_auth_schannel(struct composite_context *ctx)
 342 {
 343         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 344                                                       struct composite_context);
 345
 346         c->status = dcerpc_bind_auth_schannel_recv(ctx);
 347         if (!composite_is_ok(c)) return;
 348
 349         composite_done(c);
 350 }
 351
 352
 353 /*
 354   Stage 2 of pipe_auth: Receive result of authenticated bind request
 355 */
 356 static void continue_auth(struct composite_context *ctx)
 357 {
 358         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 359                                                       struct composite_context);
 360
 361         c->status = dcerpc_bind_auth_recv(ctx);
 362         if (!composite_is_ok(c)) return;
 363
 364         composite_done(c);
 365 }
 366 /*
 367   Stage 2 of pipe_auth: Receive result of authenticated bind request, but handle fallbacks:
 368   SPNEGO -> NTLMSSP
 369 */
 370 static void continue_auth_auto(struct composite_context *ctx)
 371 {
 372         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 373                                                       struct composite_context);
 374         struct pipe_auth_state *s = talloc_get_type(c->private_data, struct pipe_auth_state);
 375         struct composite_context *sec_conn_req;
 376
 377         c->status = dcerpc_bind_auth_recv(ctx);
 378         if (NT_STATUS_EQUAL(c->status, NT_STATUS_INVALID_PARAMETER)) {
 379                 /*
 380                  * Retry with NTLMSSP auth as fallback
 381                  * send a request for secondary rpc connection
 382                  */
 383                 sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 384                                                                 s->binding);
 385                 composite_continue(c, sec_conn_req, continue_ntlmssp_connection, c);
 386                 return;
 387         } else if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
 388                 if (cli_credentials_wrong_password(s->credentials)) {
 389                         /*
 390                          * Retry SPNEGO with a better password
 391                          * send a request for secondary rpc connection
 392                          */
 393                         sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 394                                                                         s->binding);
 395                         composite_continue(c, sec_conn_req, continue_spnego_after_wrong_pass, c);
 396                         return;
 397                 }
 398         }
 399
 400         if (!composite_is_ok(c)) return;
 401
 402         composite_done(c);
 403 }
 404
 405 /*
 406   Stage 3 of pipe_auth (fallback to NTLMSSP case): Receive secondary
 407   rpc connection (the first one can't be used any more, due to the
 408   bind nak) and perform authenticated bind request
 409 */
 410 static void continue_ntlmssp_connection(struct composite_context *ctx)
 411 {
 412         struct composite_context *c;
 413         struct pipe_auth_state *s;
 414         struct composite_context *auth_req;
 415         struct dcerpc_pipe *p2;
 416
 417         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 418         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 419
 420         /* receive secondary rpc connection */
 421         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 422         if (!composite_is_ok(c)) return;
 423
 424         talloc_steal(s, p2);
 425         talloc_steal(p2, s->pipe);
 426         s->pipe = p2;
 427
 428         /* initiate a authenticated bind */
 429         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 430                                          s->credentials,
 431                                          lp_gensec_settings(c, s->lp_ctx),
 432                                          DCERPC_AUTH_TYPE_NTLMSSP,
 433                                          dcerpc_auth_level(s->pipe->conn),
 434                                          s->table->authservices->names[0]);
 435         composite_continue(c, auth_req, continue_auth, c);
 436 }
 437
 438 /*
 439   Stage 3 of pipe_auth (retry on wrong password): Receive secondary
 440   rpc connection (the first one can't be used any more, due to the
 441   bind nak) and perform authenticated bind request
 442 */
 443 static void continue_spnego_after_wrong_pass(struct composite_context *ctx)
 444 {
 445         struct composite_context *c;
 446         struct pipe_auth_state *s;
 447         struct composite_context *auth_req;
 448         struct dcerpc_pipe *p2;
 449
 450         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 451         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 452
 453         /* receive secondary rpc connection */
 454         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 455         if (!composite_is_ok(c)) return;
 456
 457         talloc_steal(s, p2);
 458         talloc_steal(p2, s->pipe);
 459         s->pipe = p2;
 460
 461         /* initiate a authenticated bind */
 462         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 463                                          s->credentials,
 464                                          lp_gensec_settings(c, s->lp_ctx),
 465                                          DCERPC_AUTH_TYPE_SPNEGO,
 466                                          dcerpc_auth_level(s->pipe->conn),
 467                                          s->table->authservices->names[0]);
 468         composite_continue(c, auth_req, continue_auth, c);
 469 }
 470
 471
 472 /*
 473   Stage 2 of pipe_auth: Receive result of non-authenticated bind request
 474 */
 475 static void continue_auth_none(struct composite_context *ctx)
 476 {
 477         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 478                                                       struct composite_context);
 479
 480         c->status = dcerpc_bind_auth_none_recv(ctx);
 481         if (!composite_is_ok(c)) return;
 482
 483         composite_done(c);
 484 }
 485
 486
 487 /*
 488   Request to perform an authenticated bind if required. Authentication
 489   is determined using credentials passed and binding flags.
 490 */
 491 struct composite_context *dcerpc_pipe_auth_send(struct dcerpc_pipe *p,
 492                                                 struct dcerpc_binding *binding,
 493                                                 const struct ndr_interface_table *table,
 494                                                 struct cli_credentials *credentials,
 495                                                 struct loadparm_context *lp_ctx)
 496 {
 497         struct composite_context *c;
 498         struct pipe_auth_state *s;
 499         struct composite_context *auth_schannel_req;
 500         struct composite_context *auth_req;
 501         struct composite_context *auth_none_req;
 502         struct dcerpc_connection *conn;
 503         uint8_t auth_type;
 504
 505         /* composite context allocation and setup */
 506         c = composite_create(p, p->conn->event_ctx);
 507         if (c == NULL) return NULL;
 508
 509         s = talloc_zero(c, struct pipe_auth_state);
 510         if (composite_nomem(s, c)) return c;
 511         c->private_data = s;
 512
 513         /* store parameters in state structure */
 514         s->binding      = binding;
 515         s->table        = table;
 516         s->credentials  = credentials;
 517         s->pipe         = p;
 518         s->lp_ctx       = lp_ctx;
 519
 520         conn = s->pipe->conn;
 521         conn->flags = binding->flags;
 522
 523         if (DEBUGLVL(100)) {
 524                 conn->flags |= DCERPC_DEBUG_PRINT_BOTH;
 525         }
 526
 527         /* remember the binding string for possible secondary connections */
 528         conn->binding_string = dcerpc_binding_string(p, binding);
 529
 530         if (cli_credentials_is_anonymous(s->credentials)) {
 531                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 532                 composite_continue(c, auth_none_req, continue_auth_none, c);
 533                 return c;
 534         }
 535
 536         if ((binding->flags & DCERPC_SCHANNEL) &&
 537             !cli_credentials_get_netlogon_creds(s->credentials)) {
 538                 /* If we don't already have netlogon credentials for
 539                  * the schannel bind, then we have to get these
 540                  * first */
 541                 auth_schannel_req = dcerpc_bind_auth_schannel_send(c, s->pipe, s->table,
 542                                                                    s->credentials, s->lp_ctx,
 543                                                                    dcerpc_auth_level(conn));
 544                 composite_continue(c, auth_schannel_req, continue_auth_schannel, c);
 545                 return c;
 546         }
 547
 548         /*
 549          * we rely on the already authenticated CIFS connection
 550          * if not doing sign or seal
 551          */
 552         if (conn->transport.transport == NCACN_NP &&
 553             !(s->binding->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 554                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 555                 composite_continue(c, auth_none_req, continue_auth_none, c);
 556                 return c;
 557         }
 558
 559
 560         /* Perform an authenticated DCE-RPC bind
 561          */
 562         if (!(conn->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 563                 /*
 564                   we are doing an authenticated connection,
 565                   but not using sign or seal. We must force
 566                   the CONNECT dcerpc auth type as a NONE auth
 567                   type doesn't allow authentication
 568                   information to be passed.
 569                 */
 570                 conn->flags |= DCERPC_CONNECT;
 571         }
 572
 573         if (s->binding->flags & DCERPC_AUTH_SPNEGO) {
 574                 auth_type = DCERPC_AUTH_TYPE_SPNEGO;
 575
 576         } else if (s->binding->flags & DCERPC_AUTH_KRB5) {
 577                 auth_type = DCERPC_AUTH_TYPE_KRB5;
 578
 579         } else if (s->binding->flags & DCERPC_SCHANNEL) {
 580                 auth_type = DCERPC_AUTH_TYPE_SCHANNEL;
 581
 582         } else if (s->binding->flags & DCERPC_AUTH_NTLM) {
 583                 auth_type = DCERPC_AUTH_TYPE_NTLMSSP;
 584
 585         } else {
 586                 /* try SPNEGO with fallback to NTLMSSP */
 587                 auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 588                                                  s->credentials,
 589                                                  lp_gensec_settings(c, s->lp_ctx),
 590                                                  DCERPC_AUTH_TYPE_SPNEGO,
 591                                                  dcerpc_auth_level(conn),
 592                                                  s->table->authservices->names[0]);
 593                 composite_continue(c, auth_req, continue_auth_auto, c);
 594                 return c;
 595         }
 596
 597         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 598                                          s->credentials,
 599                                          lp_gensec_settings(c, s->lp_ctx),
 600                                          auth_type,
 601                                          dcerpc_auth_level(conn),
 602                                          s->table->authservices->names[0]);
 603         composite_continue(c, auth_req, continue_auth, c);
 604         return c;
 605 }
 606
 607
 608 /*
 609   Receive result of authenticated bind request on dcerpc pipe
 610
 611   This returns *p, which may be different to the one originally
 612   supllied, as it rebinds to a new pipe due to authentication fallback
 613
 614 */
 615 NTSTATUS dcerpc_pipe_auth_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 616                                struct dcerpc_pipe **p)
 617 {
 618         NTSTATUS status;
 619
 620         struct pipe_auth_state *s = talloc_get_type(c->private_data,
 621                                                     struct pipe_auth_state);
 622         status = composite_wait(c);
 623         if (!NT_STATUS_IS_OK(status)) {
 624                 char *uuid_str = GUID_string(s->pipe, &s->table->syntax_id.uuid);
 625                 DEBUG(0, ("Failed to bind to uuid %s - %s\n", uuid_str, nt_errstr(status)));
 626                 talloc_free(uuid_str);
 627         } else {
 628                 talloc_steal(mem_ctx, s->pipe);
 629                 *p = s->pipe;
 630         }
 631
 632         talloc_free(c);
 633         return status;
 634 }
 635
 636
 637 /*
 638    Perform an authenticated bind if needed - sync version
 639
 640    This may change *p, as it rebinds to a new pipe due to authentication fallback
 641 */
 642 _PUBLIC_ NTSTATUS dcerpc_pipe_auth(TALLOC_CTX *mem_ctx,
 643                           struct dcerpc_pipe **p,
 644                           struct dcerpc_binding *binding,
 645                           const struct ndr_interface_table *table,
 646                           struct cli_credentials *credentials,
 647                           struct loadparm_context *lp_ctx)
 648 {
 649         struct composite_context *c;
 650
 651         c = dcerpc_pipe_auth_send(*p, binding, table, credentials, lp_ctx);
 652         return dcerpc_pipe_auth_recv(c, mem_ctx, p);
 653 }
 654
 655
 656 NTSTATUS dcerpc_generic_session_key(struct dcerpc_connection *c,
 657                                     DATA_BLOB *session_key)
 658 {
 659         /* this took quite a few CPU cycles to find ... */
 660         session_key->data = discard_const_p(unsigned char, "SystemLibraryDTC");
 661         session_key->length = 16;
 662         return NT_STATUS_OK;
 663 }
 664
 665 /*
 666   fetch the user session key - may be default (above) or the SMB session key
 667
 668   The key is always truncated to 16 bytes
 669 */
 670 _PUBLIC_ NTSTATUS dcerpc_fetch_session_key(struct dcerpc_pipe *p,
 671                                            DATA_BLOB *session_key)
 672 {
 673         NTSTATUS status;
 674         status = p->conn->security_state.session_key(p->conn, session_key);
 675         if (!NT_STATUS_IS_OK(status)) {
 676                 return status;
 677         }
 678
 679         session_key->length = MIN(session_key->length, 16);
 680
 681         return NT_STATUS_OK;
 682 }
 683
 684
 685 /*
 686   log a rpc packet in a format suitable for ndrdump. This is especially useful
 687   for sealed packets, where ethereal cannot easily see the contents
 688
 689   this triggers on a debug level of >= 10
 690 */
 691 _PUBLIC_ void dcerpc_log_packet(const char *lockdir,
 692                                                                 const struct ndr_interface_table *ndr,
 693                        uint32_t opnum, uint32_t flags,
 694                        DATA_BLOB *pkt)
 695 {
 696         const int num_examples = 20;
 697         int i;
 698
 699         if (lockdir == NULL) return;
 700
 701         for (i=0;i<num_examples;i++) {
 702                 char *name=NULL;
 703                 asprintf(&name, "%s/rpclog/%s-%u.%d.%s",
 704                          lockdir, ndr->name, opnum, i,
 705                          (flags&NDR_IN)?"in":"out");
 706                 if (name == NULL) {
 707                         return;
 708                 }
 709                 if (!file_exist(name)) {
 710                         if (file_save(name, pkt->data, pkt->length)) {
 711                                 DEBUG(10,("Logged rpc packet to %s\n", name));
 712                         }
 713                         free(name);
 714                         break;
 715                 }
 716                 free(name);
 717         }
 718 }
 719
 720
 721
 722 /*
 723   create a secondary context from a primary connection
 724
 725   this uses dcerpc_alter_context() to create a new dcerpc context_id
 726 */
 727 _PUBLIC_ NTSTATUS dcerpc_secondary_context(struct dcerpc_pipe *p,
 728                                   struct dcerpc_pipe **pp2,
 729                                   const struct ndr_interface_table *table)
 730 {
 731         NTSTATUS status;
 732         struct dcerpc_pipe *p2;
 733
 734         p2 = talloc_zero(p, struct dcerpc_pipe);
 735         if (p2 == NULL) {
 736                 return NT_STATUS_NO_MEMORY;
 737         }
 738         p2->conn = talloc_reference(p2, p->conn);
 739         p2->request_timeout = p->request_timeout;
 740
 741         p2->context_id = ++p->conn->next_context_id;
 742
 743         p2->syntax = table->syntax_id;
 744
 745         p2->transfer_syntax = p->transfer_syntax;
 746
 747         p2->binding = talloc_reference(p2, p->binding);
 748
 749         status = dcerpc_alter_context(p2, p2, &p2->syntax, &p2->transfer_syntax);
 750         if (!NT_STATUS_IS_OK(status)) {
 751                 talloc_free(p2);
 752                 return status;
 753         }
 754
 755         *pp2 = p2;
 756
 757         return NT_STATUS_OK;
 758 }
 759
 760
 761 /*
 762   pull an dcerpc_auth structure, taking account of any auth padding in
 763   the blob at the end of the structure
 764  */
 765 NTSTATUS dcerpc_pull_auth_trailer(struct ncacn_packet *pkt,
 766                                   TALLOC_CTX *mem_ctx,
 767                                   DATA_BLOB *pkt_auth_blob,
 768                                   struct dcerpc_auth *auth,
 769                                   uint32_t *auth_length,
 770                                   bool check_pad)
 771 {
 772         struct ndr_pull *ndr;
 773         enum ndr_err_code ndr_err;
 774         uint32_t pad;
 775
 776         pad = pkt_auth_blob->length - (DCERPC_AUTH_TRAILER_LENGTH + pkt->auth_length);
 777         *auth_length = pkt_auth_blob->length - pad;
 778
 779         ndr = ndr_pull_init_blob(pkt_auth_blob, mem_ctx, NULL);
 780         if (!ndr) {
 781                 return NT_STATUS_NO_MEMORY;
 782         }
 783
 784         if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
 785                 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
 786         }
 787
 788         ndr_err = ndr_pull_advance(ndr, pad);
 789         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 790                 talloc_free(ndr);
 791                 return ndr_map_error2ntstatus(ndr_err);
 792         }
 793
 794         ndr_err = ndr_pull_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, auth);
 795         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 796                 talloc_free(ndr);
 797                 return ndr_map_error2ntstatus(ndr_err);
 798         }
 799
 800         if (check_pad && pad != auth->auth_pad_length) {
 801                 DEBUG(1,(__location__ ": WARNING: pad length mismatch. Calculated %u  got %u\n",
 802                          (unsigned)pad, (unsigned)auth->auth_pad_length));
 803         }
 804
 805         DEBUG(6,(__location__ ": auth_pad_length %u\n",
 806                  (unsigned)auth->auth_pad_length));
 807
 808         talloc_steal(mem_ctx, auth->credentials.data);
 809         talloc_free(ndr);
 810
 811         return NT_STATUS_OK;
 812 }
 813
 814