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 #include "librpc/rpc/rpc_common.h"
  35
  36 /*
  37   find a dcerpc call on an interface by name
  38 */
  39 const struct ndr_interface_call *dcerpc_iface_find_call(const struct ndr_interface_table *iface,
  40                                                         const char *name)
  41 {
  42         int i;
  43         for (i=0;i<iface->num_calls;i++) {
  44                 if (strcmp(iface->calls[i].name, name) == 0) {
  45                         return &iface->calls[i];
  46                 }
  47         }
  48         return NULL;
  49 }
  50
  51 /*
  52    push a ncacn_packet into a blob, potentially with auth info
  53 */
  54 NTSTATUS ncacn_push_auth(DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
  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);
  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         uint32_t num_towers;
 123         struct epm_Map r;
 124 };
 125
 126
 127 static void continue_epm_recv_binding(struct composite_context *ctx);
 128 static void continue_epm_map(struct tevent_req *subreq);
 129
 130
 131 /*
 132   Stage 2 of epm_map_binding: Receive connected rpc pipe and send endpoint
 133   mapping rpc request
 134 */
 135 static void continue_epm_recv_binding(struct composite_context *ctx)
 136 {
 137         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 138                                                       struct composite_context);
 139         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
 140                                                           struct epm_map_binding_state);
 141         struct tevent_req *subreq;
 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         /* prepare requested binding parameters */
 148         s->binding->object         = s->table->syntax_id;
 149
 150         c->status = dcerpc_binding_build_tower(s->pipe, s->binding, &s->twr.tower);
 151         if (!composite_is_ok(c)) return;
 152
 153         /* with some nice pretty paper around it of course */
 154         s->r.in.object        = &s->guid;
 155         s->r.in.map_tower     = &s->twr;
 156         s->r.in.entry_handle  = &s->handle;
 157         s->r.in.max_towers    = 1;
 158         s->r.out.entry_handle = &s->handle;
 159         s->r.out.num_towers   = &s->num_towers;
 160
 161         /* send request for an endpoint mapping - a rpc request on connected pipe */
 162         subreq = dcerpc_epm_Map_r_send(s, c->event_ctx,
 163                                        s->pipe->binding_handle,
 164                                        &s->r);
 165         if (composite_nomem(subreq, c)) return;
 166
 167         tevent_req_set_callback(subreq, continue_epm_map, c);
 168 }
 169
 170
 171 /*
 172   Stage 3 of epm_map_binding: Receive endpoint mapping and provide binding details
 173 */
 174 static void continue_epm_map(struct tevent_req *subreq)
 175 {
 176         struct composite_context *c = tevent_req_callback_data(subreq,
 177                                       struct composite_context);
 178         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
 179                                                           struct epm_map_binding_state);
 180
 181         /* receive result of a rpc request */
 182         c->status = dcerpc_epm_Map_r_recv(subreq, s);
 183         TALLOC_FREE(subreq);
 184         if (!composite_is_ok(c)) return;
 185
 186         /* check the details */
 187         if (s->r.out.result != 0 || *s->r.out.num_towers != 1) {
 188                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 189                 return;
 190         }
 191
 192         s->twr_r = s->r.out.towers[0].twr;
 193         if (s->twr_r == NULL) {
 194                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 195                 return;
 196         }
 197
 198         if (s->twr_r->tower.num_floors != s->twr.tower.num_floors ||
 199             s->twr_r->tower.floors[3].lhs.protocol != s->twr.tower.floors[3].lhs.protocol) {
 200                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 201                 return;
 202         }
 203
 204         /* get received endpoint */
 205         s->binding->endpoint = talloc_reference(s->binding,
 206                                                 dcerpc_floor_get_rhs_data(c, &s->twr_r->tower.floors[3]));
 207         if (composite_nomem(s->binding->endpoint, c)) return;
 208
 209         composite_done(c);
 210 }
 211
 212
 213 /*
 214   Request for endpoint mapping of dcerpc binding - try to request for endpoint
 215   unless there is default one.
 216 */
 217 struct composite_context *dcerpc_epm_map_binding_send(TALLOC_CTX *mem_ctx,
 218                                                       struct dcerpc_binding *binding,
 219                                                       const struct ndr_interface_table *table,
 220                                                       struct tevent_context *ev,
 221                                                       struct loadparm_context *lp_ctx)
 222 {
 223         struct composite_context *c;
 224         struct epm_map_binding_state *s;
 225         struct composite_context *pipe_connect_req;
 226         struct cli_credentials *anon_creds;
 227
 228         NTSTATUS status;
 229         struct dcerpc_binding *epmapper_binding;
 230         int i;
 231
 232         if (ev == NULL) {
 233                 return NULL;
 234         }
 235
 236         /* composite context allocation and setup */
 237         c = composite_create(mem_ctx, ev);
 238         if (c == NULL) {
 239                 return NULL;
 240         }
 241
 242         s = talloc_zero(c, struct epm_map_binding_state);
 243         if (composite_nomem(s, c)) return c;
 244         c->private_data = s;
 245
 246         s->binding = binding;
 247         s->table   = table;
 248
 249         /* anonymous credentials for rpc connection used to get endpoint mapping */
 250         anon_creds = cli_credentials_init(mem_ctx);
 251         cli_credentials_set_anonymous(anon_creds);
 252
 253         /*
 254           First, check if there is a default endpoint specified in the IDL
 255         */
 256         if (table != NULL) {
 257                 struct dcerpc_binding *default_binding;
 258
 259                 /* Find one of the default pipes for this interface */
 260                 for (i = 0; i < table->endpoints->count; i++) {
 261                         status = dcerpc_parse_binding(mem_ctx, table->endpoints->names[i], &default_binding);
 262
 263                         if (NT_STATUS_IS_OK(status)) {
 264                                 if (binding->transport == NCA_UNKNOWN)
 265                                         binding->transport = default_binding->transport;
 266                                 if (default_binding->transport == binding->transport &&
 267                                         default_binding->endpoint) {
 268                                         binding->endpoint = talloc_reference(binding, default_binding->endpoint);
 269                                         talloc_free(default_binding);
 270
 271                                         composite_done(c);
 272                                         return c;
 273
 274                                 } else {
 275                                         talloc_free(default_binding);
 276                                 }
 277                         }
 278                 }
 279         }
 280
 281         epmapper_binding = talloc_zero(c, struct dcerpc_binding);
 282         if (composite_nomem(epmapper_binding, c)) return c;
 283
 284         /* basic endpoint mapping data */
 285         epmapper_binding->transport             = binding->transport;
 286         epmapper_binding->host                  = talloc_reference(epmapper_binding, binding->host);
 287         epmapper_binding->target_hostname       = epmapper_binding->host;
 288         epmapper_binding->options               = NULL;
 289         epmapper_binding->localaddress          = talloc_reference(epmapper_binding, binding->localaddress);
 290         epmapper_binding->flags                 = 0;
 291         epmapper_binding->assoc_group_id        = 0;
 292         epmapper_binding->endpoint              = NULL;
 293
 294         /* initiate rpc pipe connection */
 295         pipe_connect_req = dcerpc_pipe_connect_b_send(c, epmapper_binding,
 296                                                       &ndr_table_epmapper,
 297                                                       anon_creds, c->event_ctx,
 298                                                       lp_ctx);
 299         if (composite_nomem(pipe_connect_req, c)) return c;
 300
 301         composite_continue(c, pipe_connect_req, continue_epm_recv_binding, c);
 302         return c;
 303 }
 304
 305
 306 /*
 307   Receive result of endpoint mapping request
 308  */
 309 NTSTATUS dcerpc_epm_map_binding_recv(struct composite_context *c)
 310 {
 311         NTSTATUS status = composite_wait(c);
 312
 313         talloc_free(c);
 314         return status;
 315 }
 316
 317
 318 /*
 319   Get endpoint mapping for rpc connection
 320 */
 321 _PUBLIC_ NTSTATUS dcerpc_epm_map_binding(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding,
 322                                 const struct ndr_interface_table *table, struct tevent_context *ev,
 323                                 struct loadparm_context *lp_ctx)
 324 {
 325         struct composite_context *c;
 326
 327         c = dcerpc_epm_map_binding_send(mem_ctx, binding, table, ev, lp_ctx);
 328         return dcerpc_epm_map_binding_recv(c);
 329 }
 330
 331
 332 struct pipe_auth_state {
 333         struct dcerpc_pipe *pipe;
 334         struct dcerpc_binding *binding;
 335         const struct ndr_interface_table *table;
 336         struct loadparm_context *lp_ctx;
 337         struct cli_credentials *credentials;
 338 };
 339
 340
 341 static void continue_auth_schannel(struct composite_context *ctx);
 342 static void continue_auth(struct composite_context *ctx);
 343 static void continue_auth_none(struct composite_context *ctx);
 344 static void continue_ntlmssp_connection(struct composite_context *ctx);
 345 static void continue_spnego_after_wrong_pass(struct composite_context *ctx);
 346
 347
 348 /*
 349   Stage 2 of pipe_auth: Receive result of schannel bind request
 350 */
 351 static void continue_auth_schannel(struct composite_context *ctx)
 352 {
 353         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 354                                                       struct composite_context);
 355
 356         c->status = dcerpc_bind_auth_schannel_recv(ctx);
 357         if (!composite_is_ok(c)) return;
 358
 359         composite_done(c);
 360 }
 361
 362
 363 /*
 364   Stage 2 of pipe_auth: Receive result of authenticated bind request
 365 */
 366 static void continue_auth(struct composite_context *ctx)
 367 {
 368         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 369                                                       struct composite_context);
 370
 371         c->status = dcerpc_bind_auth_recv(ctx);
 372         if (!composite_is_ok(c)) return;
 373
 374         composite_done(c);
 375 }
 376 /*
 377   Stage 2 of pipe_auth: Receive result of authenticated bind request, but handle fallbacks:
 378   SPNEGO -> NTLMSSP
 379 */
 380 static void continue_auth_auto(struct composite_context *ctx)
 381 {
 382         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 383                                                       struct composite_context);
 384         struct pipe_auth_state *s = talloc_get_type(c->private_data, struct pipe_auth_state);
 385         struct composite_context *sec_conn_req;
 386
 387         c->status = dcerpc_bind_auth_recv(ctx);
 388         if (NT_STATUS_EQUAL(c->status, NT_STATUS_INVALID_PARAMETER)) {
 389                 /*
 390                  * Retry with NTLMSSP auth as fallback
 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_ntlmssp_connection, c);
 396                 return;
 397         } else if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
 398                 if (cli_credentials_wrong_password(s->credentials)) {
 399                         /*
 400                          * Retry SPNEGO with a better password
 401                          * send a request for secondary rpc connection
 402                          */
 403                         sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 404                                                                         s->binding);
 405                         composite_continue(c, sec_conn_req, continue_spnego_after_wrong_pass, c);
 406                         return;
 407                 }
 408         }
 409
 410         if (!composite_is_ok(c)) return;
 411
 412         composite_done(c);
 413 }
 414
 415 /*
 416   Stage 3 of pipe_auth (fallback to NTLMSSP case): Receive secondary
 417   rpc connection (the first one can't be used any more, due to the
 418   bind nak) and perform authenticated bind request
 419 */
 420 static void continue_ntlmssp_connection(struct composite_context *ctx)
 421 {
 422         struct composite_context *c;
 423         struct pipe_auth_state *s;
 424         struct composite_context *auth_req;
 425         struct dcerpc_pipe *p2;
 426         void *pp;
 427
 428         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 429         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 430
 431         /* receive secondary rpc connection */
 432         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 433         if (!composite_is_ok(c)) return;
 434
 435
 436         /* this is a rather strange situation. When
 437            we come into the routine, s is a child of s->pipe, and
 438            when we created p2 above, it also became a child of
 439            s->pipe.
 440
 441            Now we want p2 to be a parent of s->pipe, and we want s to
 442            be a parent of both of them! If we don't do this very
 443            carefully we end up creating a talloc loop
 444         */
 445
 446         /* we need the new contexts to hang off the same context
 447            that s->pipe is on, but the only way to get that is
 448            via talloc_parent() */
 449         pp = talloc_parent(s->pipe);
 450
 451         /* promote s to be at the top */
 452         talloc_steal(pp, s);
 453
 454         /* and put p2 under s */
 455         talloc_steal(s, p2);
 456
 457         /* now put s->pipe under p2 */
 458         talloc_steal(p2, s->pipe);
 459
 460         s->pipe = p2;
 461
 462         /* initiate a authenticated bind */
 463         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 464                                          s->credentials,
 465                                          lpcfg_gensec_settings(c, s->lp_ctx),
 466                                          DCERPC_AUTH_TYPE_NTLMSSP,
 467                                          dcerpc_auth_level(s->pipe->conn),
 468                                          s->table->authservices->names[0]);
 469         composite_continue(c, auth_req, continue_auth, c);
 470 }
 471
 472 /*
 473   Stage 3 of pipe_auth (retry on wrong password): Receive secondary
 474   rpc connection (the first one can't be used any more, due to the
 475   bind nak) and perform authenticated bind request
 476 */
 477 static void continue_spnego_after_wrong_pass(struct composite_context *ctx)
 478 {
 479         struct composite_context *c;
 480         struct pipe_auth_state *s;
 481         struct composite_context *auth_req;
 482         struct dcerpc_pipe *p2;
 483
 484         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 485         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 486
 487         /* receive secondary rpc connection */
 488         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 489         if (!composite_is_ok(c)) return;
 490
 491         talloc_steal(s, p2);
 492         talloc_steal(p2, s->pipe);
 493         s->pipe = p2;
 494
 495         /* initiate a authenticated bind */
 496         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 497                                          s->credentials,
 498                                          lpcfg_gensec_settings(c, s->lp_ctx),
 499                                          DCERPC_AUTH_TYPE_SPNEGO,
 500                                          dcerpc_auth_level(s->pipe->conn),
 501                                          s->table->authservices->names[0]);
 502         composite_continue(c, auth_req, continue_auth, c);
 503 }
 504
 505
 506 /*
 507   Stage 2 of pipe_auth: Receive result of non-authenticated bind request
 508 */
 509 static void continue_auth_none(struct composite_context *ctx)
 510 {
 511         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 512                                                       struct composite_context);
 513
 514         c->status = dcerpc_bind_auth_none_recv(ctx);
 515         if (!composite_is_ok(c)) return;
 516
 517         composite_done(c);
 518 }
 519
 520
 521 /*
 522   Request to perform an authenticated bind if required. Authentication
 523   is determined using credentials passed and binding flags.
 524 */
 525 struct composite_context *dcerpc_pipe_auth_send(struct dcerpc_pipe *p,
 526                                                 struct dcerpc_binding *binding,
 527                                                 const struct ndr_interface_table *table,
 528                                                 struct cli_credentials *credentials,
 529                                                 struct loadparm_context *lp_ctx)
 530 {
 531         struct composite_context *c;
 532         struct pipe_auth_state *s;
 533         struct composite_context *auth_schannel_req;
 534         struct composite_context *auth_req;
 535         struct composite_context *auth_none_req;
 536         struct dcecli_connection *conn;
 537         uint8_t auth_type;
 538
 539         /* composite context allocation and setup */
 540         c = composite_create(p, p->conn->event_ctx);
 541         if (c == NULL) return NULL;
 542
 543         s = talloc_zero(c, struct pipe_auth_state);
 544         if (composite_nomem(s, c)) return c;
 545         c->private_data = s;
 546
 547         /* store parameters in state structure */
 548         s->binding      = binding;
 549         s->table        = table;
 550         s->credentials  = credentials;
 551         s->pipe         = p;
 552         s->lp_ctx       = lp_ctx;
 553
 554         conn = s->pipe->conn;
 555         conn->flags = binding->flags;
 556
 557         if (DEBUGLVL(100)) {
 558                 conn->flags |= DCERPC_DEBUG_PRINT_BOTH;
 559         }
 560
 561         /* remember the binding string for possible secondary connections */
 562         conn->binding_string = dcerpc_binding_string(p, binding);
 563
 564         if (cli_credentials_is_anonymous(s->credentials)) {
 565                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 566                 composite_continue(c, auth_none_req, continue_auth_none, c);
 567                 return c;
 568         }
 569
 570         if ((binding->flags & DCERPC_SCHANNEL) &&
 571             !cli_credentials_get_netlogon_creds(s->credentials)) {
 572                 /* If we don't already have netlogon credentials for
 573                  * the schannel bind, then we have to get these
 574                  * first */
 575                 auth_schannel_req = dcerpc_bind_auth_schannel_send(c, s->pipe, s->table,
 576                                                                    s->credentials, s->lp_ctx,
 577                                                                    dcerpc_auth_level(conn));
 578                 composite_continue(c, auth_schannel_req, continue_auth_schannel, c);
 579                 return c;
 580         }
 581
 582         /*
 583          * we rely on the already authenticated CIFS connection
 584          * if not doing sign or seal
 585          */
 586         if (conn->transport.transport == NCACN_NP &&
 587             !(s->binding->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 588                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 589                 composite_continue(c, auth_none_req, continue_auth_none, c);
 590                 return c;
 591         }
 592
 593
 594         /* Perform an authenticated DCE-RPC bind
 595          */
 596         if (!(conn->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 597                 /*
 598                   we are doing an authenticated connection,
 599                   but not using sign or seal. We must force
 600                   the CONNECT dcerpc auth type as a NONE auth
 601                   type doesn't allow authentication
 602                   information to be passed.
 603                 */
 604                 conn->flags |= DCERPC_CONNECT;
 605         }
 606
 607         if (s->binding->flags & DCERPC_AUTH_SPNEGO) {
 608                 auth_type = DCERPC_AUTH_TYPE_SPNEGO;
 609
 610         } else if (s->binding->flags & DCERPC_AUTH_KRB5) {
 611                 auth_type = DCERPC_AUTH_TYPE_KRB5;
 612
 613         } else if (s->binding->flags & DCERPC_SCHANNEL) {
 614                 auth_type = DCERPC_AUTH_TYPE_SCHANNEL;
 615
 616         } else if (s->binding->flags & DCERPC_AUTH_NTLM) {
 617                 auth_type = DCERPC_AUTH_TYPE_NTLMSSP;
 618
 619         } else {
 620                 /* try SPNEGO with fallback to NTLMSSP */
 621                 auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 622                                                  s->credentials,
 623                                                  lpcfg_gensec_settings(c, s->lp_ctx),
 624                                                  DCERPC_AUTH_TYPE_SPNEGO,
 625                                                  dcerpc_auth_level(conn),
 626                                                  s->table->authservices->names[0]);
 627                 composite_continue(c, auth_req, continue_auth_auto, c);
 628                 return c;
 629         }
 630
 631         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 632                                          s->credentials,
 633                                          lpcfg_gensec_settings(c, s->lp_ctx),
 634                                          auth_type,
 635                                          dcerpc_auth_level(conn),
 636                                          s->table->authservices->names[0]);
 637         composite_continue(c, auth_req, continue_auth, c);
 638         return c;
 639 }
 640
 641
 642 /*
 643   Receive result of authenticated bind request on dcerpc pipe
 644
 645   This returns *p, which may be different to the one originally
 646   supllied, as it rebinds to a new pipe due to authentication fallback
 647
 648 */
 649 NTSTATUS dcerpc_pipe_auth_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 650                                struct dcerpc_pipe **p)
 651 {
 652         NTSTATUS status;
 653
 654         struct pipe_auth_state *s = talloc_get_type(c->private_data,
 655                                                     struct pipe_auth_state);
 656         status = composite_wait(c);
 657         if (!NT_STATUS_IS_OK(status)) {
 658                 char *uuid_str = GUID_string(s->pipe, &s->table->syntax_id.uuid);
 659                 DEBUG(0, ("Failed to bind to uuid %s for %s %s\n", uuid_str,
 660                           dcerpc_binding_string(uuid_str, s->binding), nt_errstr(status)));
 661                 talloc_free(uuid_str);
 662         } else {
 663                 talloc_steal(mem_ctx, s->pipe);
 664                 *p = s->pipe;
 665         }
 666
 667         talloc_free(c);
 668         return status;
 669 }
 670
 671
 672 /*
 673    Perform an authenticated bind if needed - sync version
 674
 675    This may change *p, as it rebinds to a new pipe due to authentication fallback
 676 */
 677 _PUBLIC_ NTSTATUS dcerpc_pipe_auth(TALLOC_CTX *mem_ctx,
 678                           struct dcerpc_pipe **p,
 679                           struct dcerpc_binding *binding,
 680                           const struct ndr_interface_table *table,
 681                           struct cli_credentials *credentials,
 682                           struct loadparm_context *lp_ctx)
 683 {
 684         struct composite_context *c;
 685
 686         c = dcerpc_pipe_auth_send(*p, binding, table, credentials, lp_ctx);
 687         return dcerpc_pipe_auth_recv(c, mem_ctx, p);
 688 }
 689
 690
 691 NTSTATUS dcerpc_generic_session_key(struct dcecli_connection *c,
 692                                     DATA_BLOB *session_key)
 693 {
 694         /* this took quite a few CPU cycles to find ... */
 695         session_key->data = discard_const_p(unsigned char, "SystemLibraryDTC");
 696         session_key->length = 16;
 697         return NT_STATUS_OK;
 698 }
 699
 700 /*
 701   fetch the user session key - may be default (above) or the SMB session key
 702
 703   The key is always truncated to 16 bytes
 704 */
 705 _PUBLIC_ NTSTATUS dcerpc_fetch_session_key(struct dcerpc_pipe *p,
 706                                            DATA_BLOB *session_key)
 707 {
 708         NTSTATUS status;
 709         status = p->conn->security_state.session_key(p->conn, session_key);
 710         if (!NT_STATUS_IS_OK(status)) {
 711                 return status;
 712         }
 713
 714         session_key->length = MIN(session_key->length, 16);
 715
 716         return NT_STATUS_OK;
 717 }
 718
 719
 720 /*
 721   log a rpc packet in a format suitable for ndrdump. This is especially useful
 722   for sealed packets, where ethereal cannot easily see the contents
 723
 724   this triggers on a debug level of >= 10
 725 */
 726 _PUBLIC_ void dcerpc_log_packet(const char *lockdir,
 727                                 const struct ndr_interface_table *ndr,
 728                                 uint32_t opnum, uint32_t flags,
 729                                 const DATA_BLOB *pkt)
 730 {
 731         const int num_examples = 20;
 732         int i;
 733
 734         if (lockdir == NULL) return;
 735
 736         for (i=0;i<num_examples;i++) {
 737                 char *name=NULL;
 738                 asprintf(&name, "%s/rpclog/%s-%u.%d.%s",
 739                          lockdir, ndr->name, opnum, i,
 740                          (flags&NDR_IN)?"in":"out");
 741                 if (name == NULL) {
 742                         return;
 743                 }
 744                 if (!file_exist(name)) {
 745                         if (file_save(name, pkt->data, pkt->length)) {
 746                                 DEBUG(10,("Logged rpc packet to %s\n", name));
 747                         }
 748                         free(name);
 749                         break;
 750                 }
 751                 free(name);
 752         }
 753 }
 754
 755
 756
 757 /*
 758   create a secondary context from a primary connection
 759
 760   this uses dcerpc_alter_context() to create a new dcerpc context_id
 761 */
 762 _PUBLIC_ NTSTATUS dcerpc_secondary_context(struct dcerpc_pipe *p,
 763                                   struct dcerpc_pipe **pp2,
 764                                   const struct ndr_interface_table *table)
 765 {
 766         NTSTATUS status;
 767         struct dcerpc_pipe *p2;
 768
 769         p2 = talloc_zero(p, struct dcerpc_pipe);
 770         if (p2 == NULL) {
 771                 return NT_STATUS_NO_MEMORY;
 772         }
 773         p2->conn = talloc_reference(p2, p->conn);
 774         p2->request_timeout = p->request_timeout;
 775
 776         p2->context_id = ++p->conn->next_context_id;
 777
 778         p2->syntax = table->syntax_id;
 779
 780         p2->transfer_syntax = p->transfer_syntax;
 781
 782         p2->binding = talloc_reference(p2, p->binding);
 783
 784         p2->binding_handle = dcerpc_pipe_binding_handle(p2);
 785         if (p2->binding_handle == NULL) {
 786                 talloc_free(p2);
 787                 return NT_STATUS_NO_MEMORY;
 788         }
 789
 790         status = dcerpc_alter_context(p2, p2, &p2->syntax, &p2->transfer_syntax);
 791         if (!NT_STATUS_IS_OK(status)) {
 792                 talloc_free(p2);
 793                 return status;
 794         }
 795
 796         *pp2 = p2;
 797
 798         return NT_STATUS_OK;
 799 }