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 #if 0
  87                 /* the s3 rpc server doesn't handle auth padding in
  88                    bind requests. Use zero auth padding to keep us
  89                    working with old servers */
  90                 uint32_t offset = ndr->offset;
  91                 ndr_err = ndr_push_align(ndr, 16);
  92                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  93                         return ndr_map_error2ntstatus(ndr_err);
  94                 }
  95                 auth_info->auth_pad_length = ndr->offset - offset;
  96 #else
  97                 auth_info->auth_pad_length = 0;
  98 #endif
  99                 ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, auth_info);
 100                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 101                         return ndr_map_error2ntstatus(ndr_err);
 102                 }
 103         }
 104
 105         *blob = ndr_push_blob(ndr);
 106
 107         /* fill in the frag length */
 108         dcerpc_set_frag_length(blob, blob->length);
 109
 110         return NT_STATUS_OK;
 111 }
 112
 113
 114 struct epm_map_binding_state {
 115         struct dcerpc_binding *binding;
 116         const struct ndr_interface_table *table;
 117         struct dcerpc_pipe *pipe;
 118         struct policy_handle handle;
 119         struct GUID guid;
 120         struct epm_twr_t twr;
 121         struct epm_twr_t *twr_r;
 122         struct epm_Map r;
 123 };
 124
 125
 126 static void continue_epm_recv_binding(struct composite_context *ctx);
 127 static void continue_epm_map(struct rpc_request *req);
 128
 129
 130 /*
 131   Stage 2 of epm_map_binding: Receive connected rpc pipe and send endpoint
 132   mapping rpc request
 133 */
 134 static void continue_epm_recv_binding(struct composite_context *ctx)
 135 {
 136         struct rpc_request *map_req;
 137
 138         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 139                                                       struct composite_context);
 140         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
 141                                                           struct epm_map_binding_state);
 142
 143         /* receive result of rpc pipe connect request */
 144         c->status = dcerpc_pipe_connect_b_recv(ctx, c, &s->pipe);
 145         if (!composite_is_ok(c)) return;
 146
 147         s->pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 148
 149         /* prepare requested binding parameters */
 150         s->binding->object         = s->table->syntax_id;
 151
 152         c->status = dcerpc_binding_build_tower(s->pipe, s->binding, &s->twr.tower);
 153         if (!composite_is_ok(c)) return;
 154
 155         /* with some nice pretty paper around it of course */
 156         s->r.in.object        = &s->guid;
 157         s->r.in.map_tower     = &s->twr;
 158         s->r.in.entry_handle  = &s->handle;
 159         s->r.in.max_towers    = 1;
 160         s->r.out.entry_handle = &s->handle;
 161
 162         /* send request for an endpoint mapping - a rpc request on connected pipe */
 163         map_req = dcerpc_epm_Map_send(s->pipe, c, &s->r);
 164         if (composite_nomem(map_req, c)) return;
 165
 166         composite_continue_rpc(c, map_req, continue_epm_map, c);
 167 }
 168
 169
 170 /*
 171   Stage 3 of epm_map_binding: Receive endpoint mapping and provide binding details
 172 */
 173 static void continue_epm_map(struct rpc_request *req)
 174 {
 175         struct composite_context *c = talloc_get_type(req->async.private_data,
 176                                                       struct composite_context);
 177         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
 178                                                           struct epm_map_binding_state);
 179
 180         /* receive result of a rpc request */
 181         c->status = dcerpc_ndr_request_recv(req);
 182         if (!composite_is_ok(c)) return;
 183
 184         /* check the details */
 185         if (s->r.out.result != 0 || *s->r.out.num_towers != 1) {
 186                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 187                 return;
 188         }
 189
 190         s->twr_r = s->r.out.towers[0].twr;
 191         if (s->twr_r == NULL) {
 192                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 193                 return;
 194         }
 195
 196         if (s->twr_r->tower.num_floors != s->twr.tower.num_floors ||
 197             s->twr_r->tower.floors[3].lhs.protocol != s->twr.tower.floors[3].lhs.protocol) {
 198                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 199                 return;
 200         }
 201
 202         /* get received endpoint */
 203         s->binding->endpoint = talloc_reference(s->binding,
 204                                                 dcerpc_floor_get_rhs_data(c, &s->twr_r->tower.floors[3]));
 205         if (composite_nomem(s->binding->endpoint, c)) return;
 206
 207         composite_done(c);
 208 }
 209
 210
 211 /*
 212   Request for endpoint mapping of dcerpc binding - try to request for endpoint
 213   unless there is default one.
 214 */
 215 struct composite_context *dcerpc_epm_map_binding_send(TALLOC_CTX *mem_ctx,
 216                                                       struct dcerpc_binding *binding,
 217                                                       const struct ndr_interface_table *table,
 218                                                       struct tevent_context *ev,
 219                                                       struct loadparm_context *lp_ctx)
 220 {
 221         struct composite_context *c;
 222         struct epm_map_binding_state *s;
 223         struct composite_context *pipe_connect_req;
 224         struct cli_credentials *anon_creds;
 225
 226         NTSTATUS status;
 227         struct dcerpc_binding *epmapper_binding;
 228         int i;
 229
 230         if (ev == NULL) {
 231                 return NULL;
 232         }
 233
 234         /* composite context allocation and setup */
 235         c = composite_create(mem_ctx, ev);
 236         if (c == NULL) {
 237                 return NULL;
 238         }
 239
 240         s = talloc_zero(c, struct epm_map_binding_state);
 241         if (composite_nomem(s, c)) return c;
 242         c->private_data = s;
 243
 244         s->binding = binding;
 245         s->table   = table;
 246
 247         /* anonymous credentials for rpc connection used to get endpoint mapping */
 248         anon_creds = cli_credentials_init(mem_ctx);
 249         cli_credentials_set_anonymous(anon_creds);
 250
 251         /*
 252           First, check if there is a default endpoint specified in the IDL
 253         */
 254         if (table != NULL) {
 255                 struct dcerpc_binding *default_binding;
 256
 257                 /* Find one of the default pipes for this interface */
 258                 for (i = 0; i < table->endpoints->count; i++) {
 259                         status = dcerpc_parse_binding(mem_ctx, table->endpoints->names[i], &default_binding);
 260
 261                         if (NT_STATUS_IS_OK(status)) {
 262                                 if (binding->transport == NCA_UNKNOWN)
 263                                         binding->transport = default_binding->transport;
 264                                 if (default_binding->transport == binding->transport &&
 265                                         default_binding->endpoint) {
 266                                         binding->endpoint = talloc_reference(binding, default_binding->endpoint);
 267                                         talloc_free(default_binding);
 268
 269                                         composite_done(c);
 270                                         return c;
 271
 272                                 } else {
 273                                         talloc_free(default_binding);
 274                                 }
 275                         }
 276                 }
 277         }
 278
 279         epmapper_binding = talloc_zero(c, struct dcerpc_binding);
 280         if (composite_nomem(epmapper_binding, c)) return c;
 281
 282         /* basic endpoint mapping data */
 283         epmapper_binding->transport             = binding->transport;
 284         epmapper_binding->host                  = talloc_reference(epmapper_binding, binding->host);
 285         epmapper_binding->target_hostname       = epmapper_binding->host;
 286         epmapper_binding->options               = NULL;
 287         epmapper_binding->flags                 = 0;
 288         epmapper_binding->assoc_group_id        = 0;
 289         epmapper_binding->endpoint              = NULL;
 290
 291         /* initiate rpc pipe connection */
 292         pipe_connect_req = dcerpc_pipe_connect_b_send(c, epmapper_binding,
 293                                                       &ndr_table_epmapper,
 294                                                       anon_creds, c->event_ctx,
 295                                                       lp_ctx);
 296         if (composite_nomem(pipe_connect_req, c)) return c;
 297
 298         composite_continue(c, pipe_connect_req, continue_epm_recv_binding, c);
 299         return c;
 300 }
 301
 302
 303 /*
 304   Receive result of endpoint mapping request
 305  */
 306 NTSTATUS dcerpc_epm_map_binding_recv(struct composite_context *c)
 307 {
 308         NTSTATUS status = composite_wait(c);
 309
 310         talloc_free(c);
 311         return status;
 312 }
 313
 314
 315 /*
 316   Get endpoint mapping for rpc connection
 317 */
 318 _PUBLIC_ NTSTATUS dcerpc_epm_map_binding(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding,
 319                                 const struct ndr_interface_table *table, struct tevent_context *ev,
 320                                 struct loadparm_context *lp_ctx)
 321 {
 322         struct composite_context *c;
 323
 324         c = dcerpc_epm_map_binding_send(mem_ctx, binding, table, ev, lp_ctx);
 325         return dcerpc_epm_map_binding_recv(c);
 326 }
 327
 328
 329 struct pipe_auth_state {
 330         struct dcerpc_pipe *pipe;
 331         struct dcerpc_binding *binding;
 332         const struct ndr_interface_table *table;
 333         struct loadparm_context *lp_ctx;
 334         struct cli_credentials *credentials;
 335 };
 336
 337
 338 static void continue_auth_schannel(struct composite_context *ctx);
 339 static void continue_auth(struct composite_context *ctx);
 340 static void continue_auth_none(struct composite_context *ctx);
 341 static void continue_ntlmssp_connection(struct composite_context *ctx);
 342 static void continue_spnego_after_wrong_pass(struct composite_context *ctx);
 343
 344
 345 /*
 346   Stage 2 of pipe_auth: Receive result of schannel bind request
 347 */
 348 static void continue_auth_schannel(struct composite_context *ctx)
 349 {
 350         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 351                                                       struct composite_context);
 352
 353         c->status = dcerpc_bind_auth_schannel_recv(ctx);
 354         if (!composite_is_ok(c)) return;
 355
 356         composite_done(c);
 357 }
 358
 359
 360 /*
 361   Stage 2 of pipe_auth: Receive result of authenticated bind request
 362 */
 363 static void continue_auth(struct composite_context *ctx)
 364 {
 365         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 366                                                       struct composite_context);
 367
 368         c->status = dcerpc_bind_auth_recv(ctx);
 369         if (!composite_is_ok(c)) return;
 370
 371         composite_done(c);
 372 }
 373 /*
 374   Stage 2 of pipe_auth: Receive result of authenticated bind request, but handle fallbacks:
 375   SPNEGO -> NTLMSSP
 376 */
 377 static void continue_auth_auto(struct composite_context *ctx)
 378 {
 379         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 380                                                       struct composite_context);
 381         struct pipe_auth_state *s = talloc_get_type(c->private_data, struct pipe_auth_state);
 382         struct composite_context *sec_conn_req;
 383
 384         c->status = dcerpc_bind_auth_recv(ctx);
 385         if (NT_STATUS_EQUAL(c->status, NT_STATUS_INVALID_PARAMETER)) {
 386                 /*
 387                  * Retry with NTLMSSP auth as fallback
 388                  * send a request for secondary rpc connection
 389                  */
 390                 sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 391                                                                 s->binding);
 392                 composite_continue(c, sec_conn_req, continue_ntlmssp_connection, c);
 393                 return;
 394         } else if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
 395                 if (cli_credentials_wrong_password(s->credentials)) {
 396                         /*
 397                          * Retry SPNEGO with a better password
 398                          * send a request for secondary rpc connection
 399                          */
 400                         sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 401                                                                         s->binding);
 402                         composite_continue(c, sec_conn_req, continue_spnego_after_wrong_pass, c);
 403                         return;
 404                 }
 405         }
 406
 407         if (!composite_is_ok(c)) return;
 408
 409         composite_done(c);
 410 }
 411
 412 /*
 413   Stage 3 of pipe_auth (fallback to NTLMSSP case): Receive secondary
 414   rpc connection (the first one can't be used any more, due to the
 415   bind nak) and perform authenticated bind request
 416 */
 417 static void continue_ntlmssp_connection(struct composite_context *ctx)
 418 {
 419         struct composite_context *c;
 420         struct pipe_auth_state *s;
 421         struct composite_context *auth_req;
 422         struct dcerpc_pipe *p2;
 423
 424         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 425         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 426
 427         /* receive secondary rpc connection */
 428         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 429         if (!composite_is_ok(c)) return;
 430
 431         talloc_steal(s, p2);
 432         talloc_steal(p2, s->pipe);
 433         s->pipe = p2;
 434
 435         /* initiate a authenticated bind */
 436         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 437                                          s->credentials,
 438                                          lp_gensec_settings(c, s->lp_ctx),
 439                                          DCERPC_AUTH_TYPE_NTLMSSP,
 440                                          dcerpc_auth_level(s->pipe->conn),
 441                                          s->table->authservices->names[0]);
 442         composite_continue(c, auth_req, continue_auth, c);
 443 }
 444
 445 /*
 446   Stage 3 of pipe_auth (retry on wrong password): Receive secondary
 447   rpc connection (the first one can't be used any more, due to the
 448   bind nak) and perform authenticated bind request
 449 */
 450 static void continue_spnego_after_wrong_pass(struct composite_context *ctx)
 451 {
 452         struct composite_context *c;
 453         struct pipe_auth_state *s;
 454         struct composite_context *auth_req;
 455         struct dcerpc_pipe *p2;
 456
 457         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 458         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 459
 460         /* receive secondary rpc connection */
 461         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 462         if (!composite_is_ok(c)) return;
 463
 464         talloc_steal(s, p2);
 465         talloc_steal(p2, s->pipe);
 466         s->pipe = p2;
 467
 468         /* initiate a authenticated bind */
 469         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 470                                          s->credentials,
 471                                          lp_gensec_settings(c, s->lp_ctx),
 472                                          DCERPC_AUTH_TYPE_SPNEGO,
 473                                          dcerpc_auth_level(s->pipe->conn),
 474                                          s->table->authservices->names[0]);
 475         composite_continue(c, auth_req, continue_auth, c);
 476 }
 477
 478
 479 /*
 480   Stage 2 of pipe_auth: Receive result of non-authenticated bind request
 481 */
 482 static void continue_auth_none(struct composite_context *ctx)
 483 {
 484         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 485                                                       struct composite_context);
 486
 487         c->status = dcerpc_bind_auth_none_recv(ctx);
 488         if (!composite_is_ok(c)) return;
 489
 490         composite_done(c);
 491 }
 492
 493
 494 /*
 495   Request to perform an authenticated bind if required. Authentication
 496   is determined using credentials passed and binding flags.
 497 */
 498 struct composite_context *dcerpc_pipe_auth_send(struct dcerpc_pipe *p,
 499                                                 struct dcerpc_binding *binding,
 500                                                 const struct ndr_interface_table *table,
 501                                                 struct cli_credentials *credentials,
 502                                                 struct loadparm_context *lp_ctx)
 503 {
 504         struct composite_context *c;
 505         struct pipe_auth_state *s;
 506         struct composite_context *auth_schannel_req;
 507         struct composite_context *auth_req;
 508         struct composite_context *auth_none_req;
 509         struct dcerpc_connection *conn;
 510         uint8_t auth_type;
 511
 512         /* composite context allocation and setup */
 513         c = composite_create(p, p->conn->event_ctx);
 514         if (c == NULL) return NULL;
 515
 516         s = talloc_zero(c, struct pipe_auth_state);
 517         if (composite_nomem(s, c)) return c;
 518         c->private_data = s;
 519
 520         /* store parameters in state structure */
 521         s->binding      = binding;
 522         s->table        = table;
 523         s->credentials  = credentials;
 524         s->pipe         = p;
 525         s->lp_ctx       = lp_ctx;
 526
 527         conn = s->pipe->conn;
 528         conn->flags = binding->flags;
 529
 530         if (DEBUGLVL(100)) {
 531                 conn->flags |= DCERPC_DEBUG_PRINT_BOTH;
 532         }
 533
 534         /* remember the binding string for possible secondary connections */
 535         conn->binding_string = dcerpc_binding_string(p, binding);
 536
 537         if (cli_credentials_is_anonymous(s->credentials)) {
 538                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 539                 composite_continue(c, auth_none_req, continue_auth_none, c);
 540                 return c;
 541         }
 542
 543         if ((binding->flags & DCERPC_SCHANNEL) &&
 544             !cli_credentials_get_netlogon_creds(s->credentials)) {
 545                 /* If we don't already have netlogon credentials for
 546                  * the schannel bind, then we have to get these
 547                  * first */
 548                 auth_schannel_req = dcerpc_bind_auth_schannel_send(c, s->pipe, s->table,
 549                                                                    s->credentials, s->lp_ctx,
 550                                                                    dcerpc_auth_level(conn));
 551                 composite_continue(c, auth_schannel_req, continue_auth_schannel, c);
 552                 return c;
 553         }
 554
 555         /*
 556          * we rely on the already authenticated CIFS connection
 557          * if not doing sign or seal
 558          */
 559         if (conn->transport.transport == NCACN_NP &&
 560             !(s->binding->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 561                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 562                 composite_continue(c, auth_none_req, continue_auth_none, c);
 563                 return c;
 564         }
 565
 566
 567         /* Perform an authenticated DCE-RPC bind
 568          */
 569         if (!(conn->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 570                 /*
 571                   we are doing an authenticated connection,
 572                   but not using sign or seal. We must force
 573                   the CONNECT dcerpc auth type as a NONE auth
 574                   type doesn't allow authentication
 575                   information to be passed.
 576                 */
 577                 conn->flags |= DCERPC_CONNECT;
 578         }
 579
 580         if (s->binding->flags & DCERPC_AUTH_SPNEGO) {
 581                 auth_type = DCERPC_AUTH_TYPE_SPNEGO;
 582
 583         } else if (s->binding->flags & DCERPC_AUTH_KRB5) {
 584                 auth_type = DCERPC_AUTH_TYPE_KRB5;
 585
 586         } else if (s->binding->flags & DCERPC_SCHANNEL) {
 587                 auth_type = DCERPC_AUTH_TYPE_SCHANNEL;
 588
 589         } else if (s->binding->flags & DCERPC_AUTH_NTLM) {
 590                 auth_type = DCERPC_AUTH_TYPE_NTLMSSP;
 591
 592         } else {
 593                 /* try SPNEGO with fallback to NTLMSSP */
 594                 auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 595                                                  s->credentials,
 596                                                  lp_gensec_settings(c, s->lp_ctx),
 597                                                  DCERPC_AUTH_TYPE_SPNEGO,
 598                                                  dcerpc_auth_level(conn),
 599                                                  s->table->authservices->names[0]);
 600                 composite_continue(c, auth_req, continue_auth_auto, c);
 601                 return c;
 602         }
 603
 604         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 605                                          s->credentials,
 606                                          lp_gensec_settings(c, s->lp_ctx),
 607                                          auth_type,
 608                                          dcerpc_auth_level(conn),
 609                                          s->table->authservices->names[0]);
 610         composite_continue(c, auth_req, continue_auth, c);
 611         return c;
 612 }
 613
 614
 615 /*
 616   Receive result of authenticated bind request on dcerpc pipe
 617
 618   This returns *p, which may be different to the one originally
 619   supllied, as it rebinds to a new pipe due to authentication fallback
 620
 621 */
 622 NTSTATUS dcerpc_pipe_auth_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 623                                struct dcerpc_pipe **p)
 624 {
 625         NTSTATUS status;
 626
 627         struct pipe_auth_state *s = talloc_get_type(c->private_data,
 628                                                     struct pipe_auth_state);
 629         status = composite_wait(c);
 630         if (!NT_STATUS_IS_OK(status)) {
 631                 char *uuid_str = GUID_string(s->pipe, &s->table->syntax_id.uuid);
 632                 DEBUG(0, ("Failed to bind to uuid %s - %s\n", uuid_str, nt_errstr(status)));
 633                 talloc_free(uuid_str);
 634         } else {
 635                 talloc_steal(mem_ctx, s->pipe);
 636                 *p = s->pipe;
 637         }
 638
 639         talloc_free(c);
 640         return status;
 641 }
 642
 643
 644 /*
 645    Perform an authenticated bind if needed - sync version
 646
 647    This may change *p, as it rebinds to a new pipe due to authentication fallback
 648 */
 649 _PUBLIC_ NTSTATUS dcerpc_pipe_auth(TALLOC_CTX *mem_ctx,
 650                           struct dcerpc_pipe **p,
 651                           struct dcerpc_binding *binding,
 652                           const struct ndr_interface_table *table,
 653                           struct cli_credentials *credentials,
 654                           struct loadparm_context *lp_ctx)
 655 {
 656         struct composite_context *c;
 657
 658         c = dcerpc_pipe_auth_send(*p, binding, table, credentials, lp_ctx);
 659         return dcerpc_pipe_auth_recv(c, mem_ctx, p);
 660 }
 661
 662
 663 NTSTATUS dcerpc_generic_session_key(struct dcerpc_connection *c,
 664                                     DATA_BLOB *session_key)
 665 {
 666         /* this took quite a few CPU cycles to find ... */
 667         session_key->data = discard_const_p(unsigned char, "SystemLibraryDTC");
 668         session_key->length = 16;
 669         return NT_STATUS_OK;
 670 }
 671
 672 /*
 673   fetch the user session key - may be default (above) or the SMB session key
 674
 675   The key is always truncated to 16 bytes
 676 */
 677 _PUBLIC_ NTSTATUS dcerpc_fetch_session_key(struct dcerpc_pipe *p,
 678                                            DATA_BLOB *session_key)
 679 {
 680         NTSTATUS status;
 681         status = p->conn->security_state.session_key(p->conn, session_key);
 682         if (!NT_STATUS_IS_OK(status)) {
 683                 return status;
 684         }
 685
 686         session_key->length = MIN(session_key->length, 16);
 687
 688         return NT_STATUS_OK;
 689 }
 690
 691
 692 /*
 693   log a rpc packet in a format suitable for ndrdump. This is especially useful
 694   for sealed packets, where ethereal cannot easily see the contents
 695
 696   this triggers on a debug level of >= 10
 697 */
 698 _PUBLIC_ void dcerpc_log_packet(const char *lockdir,
 699                                                                 const struct ndr_interface_table *ndr,
 700                        uint32_t opnum, uint32_t flags,
 701                        DATA_BLOB *pkt)
 702 {
 703         const int num_examples = 20;
 704         int i;
 705
 706         if (lockdir == NULL) return;
 707
 708         for (i=0;i<num_examples;i++) {
 709                 char *name=NULL;
 710                 asprintf(&name, "%s/rpclog/%s-%u.%d.%s",
 711                          lockdir, ndr->name, opnum, i,
 712                          (flags&NDR_IN)?"in":"out");
 713                 if (name == NULL) {
 714                         return;
 715                 }
 716                 if (!file_exist(name)) {
 717                         if (file_save(name, pkt->data, pkt->length)) {
 718                                 DEBUG(10,("Logged rpc packet to %s\n", name));
 719                         }
 720                         free(name);
 721                         break;
 722                 }
 723                 free(name);
 724         }
 725 }
 726
 727
 728
 729 /*
 730   create a secondary context from a primary connection
 731
 732   this uses dcerpc_alter_context() to create a new dcerpc context_id
 733 */
 734 _PUBLIC_ NTSTATUS dcerpc_secondary_context(struct dcerpc_pipe *p,
 735                                   struct dcerpc_pipe **pp2,
 736                                   const struct ndr_interface_table *table)
 737 {
 738         NTSTATUS status;
 739         struct dcerpc_pipe *p2;
 740
 741         p2 = talloc_zero(p, struct dcerpc_pipe);
 742         if (p2 == NULL) {
 743                 return NT_STATUS_NO_MEMORY;
 744         }
 745         p2->conn = talloc_reference(p2, p->conn);
 746         p2->request_timeout = p->request_timeout;
 747
 748         p2->context_id = ++p->conn->next_context_id;
 749
 750         p2->syntax = table->syntax_id;
 751
 752         p2->transfer_syntax = p->transfer_syntax;
 753
 754         p2->binding = talloc_reference(p2, p->binding);
 755
 756         status = dcerpc_alter_context(p2, p2, &p2->syntax, &p2->transfer_syntax);
 757         if (!NT_STATUS_IS_OK(status)) {
 758                 talloc_free(p2);
 759                 return status;
 760         }
 761
 762         *pp2 = p2;
 763
 764         return NT_STATUS_OK;
 765 }
 766
 767
 768 /*
 769   pull an dcerpc_auth structure, taking account of any auth padding in
 770   the blob at the end of the structure
 771  */
 772 NTSTATUS dcerpc_pull_auth_trailer(struct ncacn_packet *pkt,
 773                                   TALLOC_CTX *mem_ctx,
 774                                   DATA_BLOB *pkt_auth_blob,
 775                                   struct dcerpc_auth *auth,
 776                                   uint32_t *auth_length,
 777                                   bool check_pad)
 778 {
 779         struct ndr_pull *ndr;
 780         enum ndr_err_code ndr_err;
 781         uint32_t pad;
 782
 783         pad = pkt_auth_blob->length - (DCERPC_AUTH_TRAILER_LENGTH + pkt->auth_length);
 784
 785         /* paranoia check for pad size. This would be caught anyway by
 786            the ndr_pull_advance() a few lines down, but it scared
 787            Jeremy enough for him to call me, so we might as well check
 788            it now, just to prevent someone posting a bogus YouTube
 789            video in the future.
 790         */
 791         if (pad > pkt_auth_blob->length) {
 792                 return NT_STATUS_INFO_LENGTH_MISMATCH;
 793         }
 794
 795         *auth_length = pkt_auth_blob->length - pad;
 796
 797         ndr = ndr_pull_init_blob(pkt_auth_blob, mem_ctx, NULL);
 798         if (!ndr) {
 799                 return NT_STATUS_NO_MEMORY;
 800         }
 801
 802         if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
 803                 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
 804         }
 805
 806         ndr_err = ndr_pull_advance(ndr, pad);
 807         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 808                 talloc_free(ndr);
 809                 return ndr_map_error2ntstatus(ndr_err);
 810         }
 811
 812         ndr_err = ndr_pull_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, auth);
 813         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 814                 talloc_free(ndr);
 815                 return ndr_map_error2ntstatus(ndr_err);
 816         }
 817
 818         if (check_pad && pad != auth->auth_pad_length) {
 819                 DEBUG(1,(__location__ ": WARNING: pad length mismatch. Calculated %u  got %u\n",
 820                          (unsigned)pad, (unsigned)auth->auth_pad_length));
 821         }
 822
 823         DEBUG(6,(__location__ ": auth_pad_length %u\n",
 824                  (unsigned)auth->auth_pad_length));
 825
 826         talloc_steal(mem_ctx, auth->credentials.data);
 827         talloc_free(ndr);
 828
 829         return NT_STATUS_OK;
 830 }
 831
 832