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 ncacn_packet *pkt,
  55                          struct dcerpc_auth *auth_info)
  56 {
  57         struct ndr_push *ndr;
  58         enum ndr_err_code ndr_err;
  59
  60         ndr = ndr_push_init_ctx(mem_ctx);
  61         if (!ndr) {
  62                 return NT_STATUS_NO_MEMORY;
  63         }
  64
  65         if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
  66                 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
  67         }
  68
  69         if (pkt->pfc_flags & DCERPC_PFC_FLAG_OBJECT_UUID) {
  70                 ndr->flags |= LIBNDR_FLAG_OBJECT_PRESENT;
  71         }
  72
  73         if (auth_info) {
  74                 pkt->auth_length = auth_info->credentials.length;
  75         } else {
  76                 pkt->auth_length = 0;
  77         }
  78
  79         ndr_err = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
  80         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  81                 return ndr_map_error2ntstatus(ndr_err);
  82         }
  83
  84         if (auth_info) {
  85 #if 0
  86                 /* the s3 rpc server doesn't handle auth padding in
  87                    bind requests. Use zero auth padding to keep us
  88                    working with old servers */
  89                 uint32_t offset = ndr->offset;
  90                 ndr_err = ndr_push_align(ndr, 16);
  91                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  92                         return ndr_map_error2ntstatus(ndr_err);
  93                 }
  94                 auth_info->auth_pad_length = ndr->offset - offset;
  95 #else
  96                 auth_info->auth_pad_length = 0;
  97 #endif
  98                 ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, auth_info);
  99                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 100                         return ndr_map_error2ntstatus(ndr_err);
 101                 }
 102         }
 103
 104         *blob = ndr_push_blob(ndr);
 105
 106         /* fill in the frag length */
 107         dcerpc_set_frag_length(blob, blob->length);
 108
 109         return NT_STATUS_OK;
 110 }
 111
 112
 113 struct epm_map_binding_state {
 114         struct dcerpc_binding *binding;
 115         const struct ndr_interface_table *table;
 116         struct dcerpc_pipe *pipe;
 117         struct policy_handle handle;
 118         struct GUID guid;
 119         struct epm_twr_t twr;
 120         struct epm_twr_t *twr_r;
 121         struct epm_Map r;
 122 };
 123
 124
 125 static void continue_epm_recv_binding(struct composite_context *ctx);
 126 static void continue_epm_map(struct tevent_req *subreq);
 127
 128
 129 /*
 130   Stage 2 of epm_map_binding: Receive connected rpc pipe and send endpoint
 131   mapping rpc request
 132 */
 133 static void continue_epm_recv_binding(struct composite_context *ctx)
 134 {
 135         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 136                                                       struct composite_context);
 137         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
 138                                                           struct epm_map_binding_state);
 139         struct tevent_req *subreq;
 140
 141         /* receive result of rpc pipe connect request */
 142         c->status = dcerpc_pipe_connect_b_recv(ctx, c, &s->pipe);
 143         if (!composite_is_ok(c)) return;
 144
 145         s->pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 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
 160         /* send request for an endpoint mapping - a rpc request on connected pipe */
 161         subreq = dcerpc_epm_Map_r_send(s, c->event_ctx,
 162                                        s->pipe->binding_handle,
 163                                        &s->r);
 164         if (composite_nomem(subreq, c)) return;
 165
 166         tevent_req_set_callback(subreq, 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 tevent_req *subreq)
 174 {
 175         struct composite_context *c = tevent_req_callback_data(subreq,
 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_epm_Map_r_recv(subreq, s);
 182         TALLOC_FREE(subreq);
 183         if (!composite_is_ok(c)) return;
 184
 185         /* check the details */
 186         if (s->r.out.result != 0 || *s->r.out.num_towers != 1) {
 187                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 188                 return;
 189         }
 190
 191         s->twr_r = s->r.out.towers[0].twr;
 192         if (s->twr_r == NULL) {
 193                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 194                 return;
 195         }
 196
 197         if (s->twr_r->tower.num_floors != s->twr.tower.num_floors ||
 198             s->twr_r->tower.floors[3].lhs.protocol != s->twr.tower.floors[3].lhs.protocol) {
 199                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 200                 return;
 201         }
 202
 203         /* get received endpoint */
 204         s->binding->endpoint = talloc_reference(s->binding,
 205                                                 dcerpc_floor_get_rhs_data(c, &s->twr_r->tower.floors[3]));
 206         if (composite_nomem(s->binding->endpoint, c)) return;
 207
 208         composite_done(c);
 209 }
 210
 211
 212 /*
 213   Request for endpoint mapping of dcerpc binding - try to request for endpoint
 214   unless there is default one.
 215 */
 216 struct composite_context *dcerpc_epm_map_binding_send(TALLOC_CTX *mem_ctx,
 217                                                       struct dcerpc_binding *binding,
 218                                                       const struct ndr_interface_table *table,
 219                                                       struct tevent_context *ev,
 220                                                       struct loadparm_context *lp_ctx)
 221 {
 222         struct composite_context *c;
 223         struct epm_map_binding_state *s;
 224         struct composite_context *pipe_connect_req;
 225         struct cli_credentials *anon_creds;
 226
 227         NTSTATUS status;
 228         struct dcerpc_binding *epmapper_binding;
 229         int i;
 230
 231         if (ev == NULL) {
 232                 return NULL;
 233         }
 234
 235         /* composite context allocation and setup */
 236         c = composite_create(mem_ctx, ev);
 237         if (c == NULL) {
 238                 return NULL;
 239         }
 240
 241         s = talloc_zero(c, struct epm_map_binding_state);
 242         if (composite_nomem(s, c)) return c;
 243         c->private_data = s;
 244
 245         s->binding = binding;
 246         s->table   = table;
 247
 248         /* anonymous credentials for rpc connection used to get endpoint mapping */
 249         anon_creds = cli_credentials_init(mem_ctx);
 250         cli_credentials_set_anonymous(anon_creds);
 251
 252         /*
 253           First, check if there is a default endpoint specified in the IDL
 254         */
 255         if (table != NULL) {
 256                 struct dcerpc_binding *default_binding;
 257
 258                 /* Find one of the default pipes for this interface */
 259                 for (i = 0; i < table->endpoints->count; i++) {
 260                         status = dcerpc_parse_binding(mem_ctx, table->endpoints->names[i], &default_binding);
 261
 262                         if (NT_STATUS_IS_OK(status)) {
 263                                 if (binding->transport == NCA_UNKNOWN)
 264                                         binding->transport = default_binding->transport;
 265                                 if (default_binding->transport == binding->transport &&
 266                                         default_binding->endpoint) {
 267                                         binding->endpoint = talloc_reference(binding, default_binding->endpoint);
 268                                         talloc_free(default_binding);
 269
 270                                         composite_done(c);
 271                                         return c;
 272
 273                                 } else {
 274                                         talloc_free(default_binding);
 275                                 }
 276                         }
 277                 }
 278         }
 279
 280         epmapper_binding = talloc_zero(c, struct dcerpc_binding);
 281         if (composite_nomem(epmapper_binding, c)) return c;
 282
 283         /* basic endpoint mapping data */
 284         epmapper_binding->transport             = binding->transport;
 285         epmapper_binding->host                  = talloc_reference(epmapper_binding, binding->host);
 286         epmapper_binding->target_hostname       = epmapper_binding->host;
 287         epmapper_binding->options               = NULL;
 288         epmapper_binding->flags                 = 0;
 289         epmapper_binding->assoc_group_id        = 0;
 290         epmapper_binding->endpoint              = NULL;
 291
 292         /* initiate rpc pipe connection */
 293         pipe_connect_req = dcerpc_pipe_connect_b_send(c, epmapper_binding,
 294                                                       &ndr_table_epmapper,
 295                                                       anon_creds, c->event_ctx,
 296                                                       lp_ctx);
 297         if (composite_nomem(pipe_connect_req, c)) return c;
 298
 299         composite_continue(c, pipe_connect_req, continue_epm_recv_binding, c);
 300         return c;
 301 }
 302
 303
 304 /*
 305   Receive result of endpoint mapping request
 306  */
 307 NTSTATUS dcerpc_epm_map_binding_recv(struct composite_context *c)
 308 {
 309         NTSTATUS status = composite_wait(c);
 310
 311         talloc_free(c);
 312         return status;
 313 }
 314
 315
 316 /*
 317   Get endpoint mapping for rpc connection
 318 */
 319 _PUBLIC_ NTSTATUS dcerpc_epm_map_binding(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding,
 320                                 const struct ndr_interface_table *table, struct tevent_context *ev,
 321                                 struct loadparm_context *lp_ctx)
 322 {
 323         struct composite_context *c;
 324
 325         c = dcerpc_epm_map_binding_send(mem_ctx, binding, table, ev, lp_ctx);
 326         return dcerpc_epm_map_binding_recv(c);
 327 }
 328
 329
 330 struct pipe_auth_state {
 331         struct dcerpc_pipe *pipe;
 332         struct dcerpc_binding *binding;
 333         const struct ndr_interface_table *table;
 334         struct loadparm_context *lp_ctx;
 335         struct cli_credentials *credentials;
 336 };
 337
 338
 339 static void continue_auth_schannel(struct composite_context *ctx);
 340 static void continue_auth(struct composite_context *ctx);
 341 static void continue_auth_none(struct composite_context *ctx);
 342 static void continue_ntlmssp_connection(struct composite_context *ctx);
 343 static void continue_spnego_after_wrong_pass(struct composite_context *ctx);
 344
 345
 346 /*
 347   Stage 2 of pipe_auth: Receive result of schannel bind request
 348 */
 349 static void continue_auth_schannel(struct composite_context *ctx)
 350 {
 351         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 352                                                       struct composite_context);
 353
 354         c->status = dcerpc_bind_auth_schannel_recv(ctx);
 355         if (!composite_is_ok(c)) return;
 356
 357         composite_done(c);
 358 }
 359
 360
 361 /*
 362   Stage 2 of pipe_auth: Receive result of authenticated bind request
 363 */
 364 static void continue_auth(struct composite_context *ctx)
 365 {
 366         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 367                                                       struct composite_context);
 368
 369         c->status = dcerpc_bind_auth_recv(ctx);
 370         if (!composite_is_ok(c)) return;
 371
 372         composite_done(c);
 373 }
 374 /*
 375   Stage 2 of pipe_auth: Receive result of authenticated bind request, but handle fallbacks:
 376   SPNEGO -> NTLMSSP
 377 */
 378 static void continue_auth_auto(struct composite_context *ctx)
 379 {
 380         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 381                                                       struct composite_context);
 382         struct pipe_auth_state *s = talloc_get_type(c->private_data, struct pipe_auth_state);
 383         struct composite_context *sec_conn_req;
 384
 385         c->status = dcerpc_bind_auth_recv(ctx);
 386         if (NT_STATUS_EQUAL(c->status, NT_STATUS_INVALID_PARAMETER)) {
 387                 /*
 388                  * Retry with NTLMSSP auth as fallback
 389                  * send a request for secondary rpc connection
 390                  */
 391                 sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 392                                                                 s->binding);
 393                 composite_continue(c, sec_conn_req, continue_ntlmssp_connection, c);
 394                 return;
 395         } else if (NT_STATUS_EQUAL(c->status, NT_STATUS_LOGON_FAILURE)) {
 396                 if (cli_credentials_wrong_password(s->credentials)) {
 397                         /*
 398                          * Retry SPNEGO with a better password
 399                          * send a request for secondary rpc connection
 400                          */
 401                         sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
 402                                                                         s->binding);
 403                         composite_continue(c, sec_conn_req, continue_spnego_after_wrong_pass, c);
 404                         return;
 405                 }
 406         }
 407
 408         if (!composite_is_ok(c)) return;
 409
 410         composite_done(c);
 411 }
 412
 413 /*
 414   Stage 3 of pipe_auth (fallback to NTLMSSP case): Receive secondary
 415   rpc connection (the first one can't be used any more, due to the
 416   bind nak) and perform authenticated bind request
 417 */
 418 static void continue_ntlmssp_connection(struct composite_context *ctx)
 419 {
 420         struct composite_context *c;
 421         struct pipe_auth_state *s;
 422         struct composite_context *auth_req;
 423         struct dcerpc_pipe *p2;
 424         void *pp;
 425
 426         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 427         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 428
 429         /* receive secondary rpc connection */
 430         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 431         if (!composite_is_ok(c)) return;
 432
 433
 434         /* this is a rather strange situation. When
 435            we come into the routine, s is a child of s->pipe, and
 436            when we created p2 above, it also became a child of
 437            s->pipe.
 438
 439            Now we want p2 to be a parent of s->pipe, and we want s to
 440            be a parent of both of them! If we don't do this very
 441            carefully we end up creating a talloc loop
 442         */
 443
 444         /* we need the new contexts to hang off the same context
 445            that s->pipe is on, but the only way to get that is
 446            via talloc_parent() */
 447         pp = talloc_parent(s->pipe);
 448
 449         /* promote s to be at the top */
 450         talloc_steal(pp, s);
 451
 452         /* and put p2 under s */
 453         talloc_steal(s, p2);
 454
 455         /* now put s->pipe under p2 */
 456         talloc_steal(p2, s->pipe);
 457
 458         s->pipe = p2;
 459
 460         /* initiate a authenticated bind */
 461         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 462                                          s->credentials,
 463                                          lp_gensec_settings(c, s->lp_ctx),
 464                                          DCERPC_AUTH_TYPE_NTLMSSP,
 465                                          dcerpc_auth_level(s->pipe->conn),
 466                                          s->table->authservices->names[0]);
 467         composite_continue(c, auth_req, continue_auth, c);
 468 }
 469
 470 /*
 471   Stage 3 of pipe_auth (retry on wrong password): Receive secondary
 472   rpc connection (the first one can't be used any more, due to the
 473   bind nak) and perform authenticated bind request
 474 */
 475 static void continue_spnego_after_wrong_pass(struct composite_context *ctx)
 476 {
 477         struct composite_context *c;
 478         struct pipe_auth_state *s;
 479         struct composite_context *auth_req;
 480         struct dcerpc_pipe *p2;
 481
 482         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 483         s = talloc_get_type(c->private_data, struct pipe_auth_state);
 484
 485         /* receive secondary rpc connection */
 486         c->status = dcerpc_secondary_connection_recv(ctx, &p2);
 487         if (!composite_is_ok(c)) return;
 488
 489         talloc_steal(s, p2);
 490         talloc_steal(p2, s->pipe);
 491         s->pipe = p2;
 492
 493         /* initiate a authenticated bind */
 494         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 495                                          s->credentials,
 496                                          lp_gensec_settings(c, s->lp_ctx),
 497                                          DCERPC_AUTH_TYPE_SPNEGO,
 498                                          dcerpc_auth_level(s->pipe->conn),
 499                                          s->table->authservices->names[0]);
 500         composite_continue(c, auth_req, continue_auth, c);
 501 }
 502
 503
 504 /*
 505   Stage 2 of pipe_auth: Receive result of non-authenticated bind request
 506 */
 507 static void continue_auth_none(struct composite_context *ctx)
 508 {
 509         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 510                                                       struct composite_context);
 511
 512         c->status = dcerpc_bind_auth_none_recv(ctx);
 513         if (!composite_is_ok(c)) return;
 514
 515         composite_done(c);
 516 }
 517
 518
 519 /*
 520   Request to perform an authenticated bind if required. Authentication
 521   is determined using credentials passed and binding flags.
 522 */
 523 struct composite_context *dcerpc_pipe_auth_send(struct dcerpc_pipe *p,
 524                                                 struct dcerpc_binding *binding,
 525                                                 const struct ndr_interface_table *table,
 526                                                 struct cli_credentials *credentials,
 527                                                 struct loadparm_context *lp_ctx)
 528 {
 529         struct composite_context *c;
 530         struct pipe_auth_state *s;
 531         struct composite_context *auth_schannel_req;
 532         struct composite_context *auth_req;
 533         struct composite_context *auth_none_req;
 534         struct dcerpc_connection *conn;
 535         uint8_t auth_type;
 536
 537         /* composite context allocation and setup */
 538         c = composite_create(p, p->conn->event_ctx);
 539         if (c == NULL) return NULL;
 540
 541         s = talloc_zero(c, struct pipe_auth_state);
 542         if (composite_nomem(s, c)) return c;
 543         c->private_data = s;
 544
 545         /* store parameters in state structure */
 546         s->binding      = binding;
 547         s->table        = table;
 548         s->credentials  = credentials;
 549         s->pipe         = p;
 550         s->lp_ctx       = lp_ctx;
 551
 552         conn = s->pipe->conn;
 553         conn->flags = binding->flags;
 554
 555         if (DEBUGLVL(100)) {
 556                 conn->flags |= DCERPC_DEBUG_PRINT_BOTH;
 557         }
 558
 559         /* remember the binding string for possible secondary connections */
 560         conn->binding_string = dcerpc_binding_string(p, binding);
 561
 562         if (cli_credentials_is_anonymous(s->credentials)) {
 563                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 564                 composite_continue(c, auth_none_req, continue_auth_none, c);
 565                 return c;
 566         }
 567
 568         if ((binding->flags & DCERPC_SCHANNEL) &&
 569             !cli_credentials_get_netlogon_creds(s->credentials)) {
 570                 /* If we don't already have netlogon credentials for
 571                  * the schannel bind, then we have to get these
 572                  * first */
 573                 auth_schannel_req = dcerpc_bind_auth_schannel_send(c, s->pipe, s->table,
 574                                                                    s->credentials, s->lp_ctx,
 575                                                                    dcerpc_auth_level(conn));
 576                 composite_continue(c, auth_schannel_req, continue_auth_schannel, c);
 577                 return c;
 578         }
 579
 580         /*
 581          * we rely on the already authenticated CIFS connection
 582          * if not doing sign or seal
 583          */
 584         if (conn->transport.transport == NCACN_NP &&
 585             !(s->binding->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 586                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
 587                 composite_continue(c, auth_none_req, continue_auth_none, c);
 588                 return c;
 589         }
 590
 591
 592         /* Perform an authenticated DCE-RPC bind
 593          */
 594         if (!(conn->flags & (DCERPC_SIGN|DCERPC_SEAL))) {
 595                 /*
 596                   we are doing an authenticated connection,
 597                   but not using sign or seal. We must force
 598                   the CONNECT dcerpc auth type as a NONE auth
 599                   type doesn't allow authentication
 600                   information to be passed.
 601                 */
 602                 conn->flags |= DCERPC_CONNECT;
 603         }
 604
 605         if (s->binding->flags & DCERPC_AUTH_SPNEGO) {
 606                 auth_type = DCERPC_AUTH_TYPE_SPNEGO;
 607
 608         } else if (s->binding->flags & DCERPC_AUTH_KRB5) {
 609                 auth_type = DCERPC_AUTH_TYPE_KRB5;
 610
 611         } else if (s->binding->flags & DCERPC_SCHANNEL) {
 612                 auth_type = DCERPC_AUTH_TYPE_SCHANNEL;
 613
 614         } else if (s->binding->flags & DCERPC_AUTH_NTLM) {
 615                 auth_type = DCERPC_AUTH_TYPE_NTLMSSP;
 616
 617         } else {
 618                 /* try SPNEGO with fallback to NTLMSSP */
 619                 auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 620                                                  s->credentials,
 621                                                  lp_gensec_settings(c, s->lp_ctx),
 622                                                  DCERPC_AUTH_TYPE_SPNEGO,
 623                                                  dcerpc_auth_level(conn),
 624                                                  s->table->authservices->names[0]);
 625                 composite_continue(c, auth_req, continue_auth_auto, c);
 626                 return c;
 627         }
 628
 629         auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
 630                                          s->credentials,
 631                                          lp_gensec_settings(c, s->lp_ctx),
 632                                          auth_type,
 633                                          dcerpc_auth_level(conn),
 634                                          s->table->authservices->names[0]);
 635         composite_continue(c, auth_req, continue_auth, c);
 636         return c;
 637 }
 638
 639
 640 /*
 641   Receive result of authenticated bind request on dcerpc pipe
 642
 643   This returns *p, which may be different to the one originally
 644   supllied, as it rebinds to a new pipe due to authentication fallback
 645
 646 */
 647 NTSTATUS dcerpc_pipe_auth_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 648                                struct dcerpc_pipe **p)
 649 {
 650         NTSTATUS status;
 651
 652         struct pipe_auth_state *s = talloc_get_type(c->private_data,
 653                                                     struct pipe_auth_state);
 654         status = composite_wait(c);
 655         if (!NT_STATUS_IS_OK(status)) {
 656                 char *uuid_str = GUID_string(s->pipe, &s->table->syntax_id.uuid);
 657                 DEBUG(0, ("Failed to bind to uuid %s - %s\n", uuid_str, nt_errstr(status)));
 658                 talloc_free(uuid_str);
 659         } else {
 660                 talloc_steal(mem_ctx, s->pipe);
 661                 *p = s->pipe;
 662         }
 663
 664         talloc_free(c);
 665         return status;
 666 }
 667
 668
 669 /*
 670    Perform an authenticated bind if needed - sync version
 671
 672    This may change *p, as it rebinds to a new pipe due to authentication fallback
 673 */
 674 _PUBLIC_ NTSTATUS dcerpc_pipe_auth(TALLOC_CTX *mem_ctx,
 675                           struct dcerpc_pipe **p,
 676                           struct dcerpc_binding *binding,
 677                           const struct ndr_interface_table *table,
 678                           struct cli_credentials *credentials,
 679                           struct loadparm_context *lp_ctx)
 680 {
 681         struct composite_context *c;
 682
 683         c = dcerpc_pipe_auth_send(*p, binding, table, credentials, lp_ctx);
 684         return dcerpc_pipe_auth_recv(c, mem_ctx, p);
 685 }
 686
 687
 688 NTSTATUS dcerpc_generic_session_key(struct dcerpc_connection *c,
 689                                     DATA_BLOB *session_key)
 690 {
 691         /* this took quite a few CPU cycles to find ... */
 692         session_key->data = discard_const_p(unsigned char, "SystemLibraryDTC");
 693         session_key->length = 16;
 694         return NT_STATUS_OK;
 695 }
 696
 697 /*
 698   fetch the user session key - may be default (above) or the SMB session key
 699
 700   The key is always truncated to 16 bytes
 701 */
 702 _PUBLIC_ NTSTATUS dcerpc_fetch_session_key(struct dcerpc_pipe *p,
 703                                            DATA_BLOB *session_key)
 704 {
 705         NTSTATUS status;
 706         status = p->conn->security_state.session_key(p->conn, session_key);
 707         if (!NT_STATUS_IS_OK(status)) {
 708                 return status;
 709         }
 710
 711         session_key->length = MIN(session_key->length, 16);
 712
 713         return NT_STATUS_OK;
 714 }
 715
 716
 717 /*
 718   log a rpc packet in a format suitable for ndrdump. This is especially useful
 719   for sealed packets, where ethereal cannot easily see the contents
 720
 721   this triggers on a debug level of >= 10
 722 */
 723 _PUBLIC_ void dcerpc_log_packet(const char *lockdir,
 724                                                                 const struct ndr_interface_table *ndr,
 725                        uint32_t opnum, uint32_t flags,
 726                        DATA_BLOB *pkt)
 727 {
 728         const int num_examples = 20;
 729         int i;
 730
 731         if (lockdir == NULL) return;
 732
 733         for (i=0;i<num_examples;i++) {
 734                 char *name=NULL;
 735                 asprintf(&name, "%s/rpclog/%s-%u.%d.%s",
 736                          lockdir, ndr->name, opnum, i,
 737                          (flags&NDR_IN)?"in":"out");
 738                 if (name == NULL) {
 739                         return;
 740                 }
 741                 if (!file_exist(name)) {
 742                         if (file_save(name, pkt->data, pkt->length)) {
 743                                 DEBUG(10,("Logged rpc packet to %s\n", name));
 744                         }
 745                         free(name);
 746                         break;
 747                 }
 748                 free(name);
 749         }
 750 }
 751
 752
 753
 754 /*
 755   create a secondary context from a primary connection
 756
 757   this uses dcerpc_alter_context() to create a new dcerpc context_id
 758 */
 759 _PUBLIC_ NTSTATUS dcerpc_secondary_context(struct dcerpc_pipe *p,
 760                                   struct dcerpc_pipe **pp2,
 761                                   const struct ndr_interface_table *table)
 762 {
 763         NTSTATUS status;
 764         struct dcerpc_pipe *p2;
 765
 766         p2 = talloc_zero(p, struct dcerpc_pipe);
 767         if (p2 == NULL) {
 768                 return NT_STATUS_NO_MEMORY;
 769         }
 770         p2->conn = talloc_reference(p2, p->conn);
 771         p2->request_timeout = p->request_timeout;
 772
 773         p2->context_id = ++p->conn->next_context_id;
 774
 775         p2->syntax = table->syntax_id;
 776
 777         p2->transfer_syntax = p->transfer_syntax;
 778
 779         p2->binding = talloc_reference(p2, p->binding);
 780
 781         p2->binding_handle = talloc(p2, struct dcerpc_binding_handle);
 782         if (p2->binding_handle == NULL) {
 783                 talloc_free(p2);
 784                 return NT_STATUS_NO_MEMORY;
 785         }
 786         p2->binding_handle->private_data = p2;
 787
 788         status = dcerpc_alter_context(p2, p2, &p2->syntax, &p2->transfer_syntax);
 789         if (!NT_STATUS_IS_OK(status)) {
 790                 talloc_free(p2);
 791                 return status;
 792         }
 793
 794         *pp2 = p2;
 795
 796         return NT_STATUS_OK;
 797 }
 798
 799
 800 /*
 801   pull an dcerpc_auth structure, taking account of any auth padding in
 802   the blob at the end of the structure
 803  */
 804 NTSTATUS dcerpc_pull_auth_trailer(struct ncacn_packet *pkt,
 805                                   TALLOC_CTX *mem_ctx,
 806                                   DATA_BLOB *pkt_auth_blob,
 807                                   struct dcerpc_auth *auth,
 808                                   uint32_t *auth_length,
 809                                   bool check_pad)
 810 {
 811         struct ndr_pull *ndr;
 812         enum ndr_err_code ndr_err;
 813         uint32_t pad;
 814
 815         pad = pkt_auth_blob->length - (DCERPC_AUTH_TRAILER_LENGTH + pkt->auth_length);
 816
 817         /* paranoia check for pad size. This would be caught anyway by
 818            the ndr_pull_advance() a few lines down, but it scared
 819            Jeremy enough for him to call me, so we might as well check
 820            it now, just to prevent someone posting a bogus YouTube
 821            video in the future.
 822         */
 823         if (pad > pkt_auth_blob->length) {
 824                 return NT_STATUS_INFO_LENGTH_MISMATCH;
 825         }
 826
 827         *auth_length = pkt_auth_blob->length - pad;
 828
 829         ndr = ndr_pull_init_blob(pkt_auth_blob, mem_ctx);
 830         if (!ndr) {
 831                 return NT_STATUS_NO_MEMORY;
 832         }
 833
 834         if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
 835                 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
 836         }
 837
 838         ndr_err = ndr_pull_advance(ndr, pad);
 839         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 840                 talloc_free(ndr);
 841                 return ndr_map_error2ntstatus(ndr_err);
 842         }
 843
 844         ndr_err = ndr_pull_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, auth);
 845         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 846                 talloc_free(ndr);
 847                 return ndr_map_error2ntstatus(ndr_err);
 848         }
 849
 850         if (check_pad && pad != auth->auth_pad_length) {
 851                 DEBUG(1,(__location__ ": WARNING: pad length mismatch. Calculated %u  got %u\n",
 852                          (unsigned)pad, (unsigned)auth->auth_pad_length));
 853         }
 854
 855         DEBUG(6,(__location__ ": auth_pad_length %u\n",
 856                  (unsigned)auth->auth_pad_length));
 857
 858         talloc_steal(mem_ctx, auth->credentials.data);
 859         talloc_free(ndr);
 860
 861         return NT_STATUS_OK;
 862 }
 863
 864