librpc/rpc/binding_handle.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    dcerpc binding handle functions
   5
   6    Copyright (C) Stefan Metzmacher 2010
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include <tevent.h>
  24 #include "../lib/util/tevent_ntstatus.h"
  25 #include "librpc/rpc/dcerpc.h"
  26 #include "rpc_common.h"
  27
  28 struct dcerpc_binding_handle {
  29         void *private_data;
  30         const struct dcerpc_binding_handle_ops *ops;
  31         const char *location;
  32         const struct GUID *object;
  33         const struct ndr_interface_table *table;
  34         struct tevent_context *sync_ev;
  35 };
  36
  37 static int dcerpc_binding_handle_destructor(struct dcerpc_binding_handle *b)
  38 {
  39         return 0;
  40 }
  41
  42 struct dcerpc_binding_handle *_dcerpc_binding_handle_create(TALLOC_CTX *mem_ctx,
  43                                         const struct dcerpc_binding_handle_ops *ops,
  44                                         const struct GUID *object,
  45                                         const struct ndr_interface_table *table,
  46                                         void *pstate,
  47                                         size_t psize,
  48                                         const char *type,
  49                                         const char *location)
  50 {
  51         struct dcerpc_binding_handle *h;
  52         void **ppstate = (void **)pstate;
  53         void *state;
  54
  55         h = talloc_zero(mem_ctx, struct dcerpc_binding_handle);
  56         if (h == NULL) {
  57                 return NULL;
  58         }
  59         h->ops          = ops;
  60         h->location     = location;
  61         h->object       = object;
  62         h->table        = table;
  63
  64         state = talloc_zero_size(h, psize);
  65         if (state == NULL) {
  66                 talloc_free(h);
  67                 return NULL;
  68         }
  69         talloc_set_name_const(state, type);
  70
  71         h->private_data = state;
  72
  73         talloc_set_destructor(h, dcerpc_binding_handle_destructor);
  74
  75         *ppstate = state;
  76         return h;
  77 }
  78
  79 void *_dcerpc_binding_handle_data(struct dcerpc_binding_handle *h)
  80 {
  81         return h->private_data;
  82 }
  83
  84 void dcerpc_binding_handle_set_sync_ev(struct dcerpc_binding_handle *h,
  85                                        struct tevent_context *ev)
  86 {
  87         h->sync_ev = ev;
  88 }
  89
  90 bool dcerpc_binding_handle_is_connected(struct dcerpc_binding_handle *h)
  91 {
  92         return h->ops->is_connected(h);
  93 }
  94
  95 uint32_t dcerpc_binding_handle_set_timeout(struct dcerpc_binding_handle *h,
  96                                            uint32_t timeout)
  97 {
  98         return h->ops->set_timeout(h, timeout);
  99 }
 100
 101 void dcerpc_binding_handle_auth_info(struct dcerpc_binding_handle *h,
 102                                      enum dcerpc_AuthType *auth_type,
 103                                      enum dcerpc_AuthLevel *auth_level)
 104 {
 105         enum dcerpc_AuthType _auth_type;
 106         enum dcerpc_AuthLevel _auth_level;
 107
 108         if (auth_type == NULL) {
 109                 auth_type = &_auth_type;
 110         }
 111
 112         if (auth_level == NULL) {
 113                 auth_level = &_auth_level;
 114         }
 115
 116         *auth_type = DCERPC_AUTH_TYPE_NONE;
 117         *auth_level = DCERPC_AUTH_LEVEL_NONE;
 118
 119         if (h->ops->auth_info == NULL) {
 120                 return;
 121         }
 122
 123         h->ops->auth_info(h, auth_type, auth_level);
 124 }
 125
 126 struct dcerpc_binding_handle_raw_call_state {
 127         const struct dcerpc_binding_handle_ops *ops;
 128         uint8_t *out_data;
 129         size_t out_length;
 130         uint32_t out_flags;
 131 };
 132
 133 static void dcerpc_binding_handle_raw_call_done(struct tevent_req *subreq);
 134
 135 struct tevent_req *dcerpc_binding_handle_raw_call_send(TALLOC_CTX *mem_ctx,
 136                                                 struct tevent_context *ev,
 137                                                 struct dcerpc_binding_handle *h,
 138                                                 const struct GUID *object,
 139                                                 uint32_t opnum,
 140                                                 uint32_t in_flags,
 141                                                 const uint8_t *in_data,
 142                                                 size_t in_length)
 143 {
 144         struct tevent_req *req;
 145         struct dcerpc_binding_handle_raw_call_state *state;
 146         struct tevent_req *subreq;
 147
 148         req = tevent_req_create(mem_ctx, &state,
 149                                 struct dcerpc_binding_handle_raw_call_state);
 150         if (req == NULL) {
 151                 return NULL;
 152         }
 153         state->ops = h->ops;
 154         state->out_data = NULL;
 155         state->out_length = 0;
 156         state->out_flags = 0;
 157
 158         if (h->object != NULL) {
 159                 /*
 160                  * If an object is set on the binding handle,
 161                  * per request object passing is not allowed.
 162                  */
 163                 if (object != NULL) {
 164                         tevent_req_nterror(req, NT_STATUS_INVALID_HANDLE);
 165                         return tevent_req_post(req, ev);
 166                 }
 167
 168                 /*
 169                  * We use the object from the binding handle
 170                  */
 171                 object = h->object;
 172         }
 173
 174         subreq = state->ops->raw_call_send(state, ev, h,
 175                                            object, opnum,
 176                                            in_flags, in_data, in_length);
 177         if (tevent_req_nomem(subreq, req)) {
 178                 return tevent_req_post(req, ev);
 179         }
 180         tevent_req_set_callback(subreq, dcerpc_binding_handle_raw_call_done, req);
 181
 182         return req;
 183 }
 184
 185 static void dcerpc_binding_handle_raw_call_done(struct tevent_req *subreq)
 186 {
 187         struct tevent_req *req = tevent_req_callback_data(subreq,
 188                                  struct tevent_req);
 189         struct dcerpc_binding_handle_raw_call_state *state =
 190                 tevent_req_data(req,
 191                 struct dcerpc_binding_handle_raw_call_state);
 192         NTSTATUS error;
 193
 194         error = state->ops->raw_call_recv(subreq, state,
 195                                           &state->out_data,
 196                                           &state->out_length,
 197                                           &state->out_flags);
 198         TALLOC_FREE(subreq);
 199         if (tevent_req_nterror(req, error)) {
 200                 return;
 201         }
 202
 203         tevent_req_done(req);
 204 }
 205
 206 NTSTATUS dcerpc_binding_handle_raw_call_recv(struct tevent_req *req,
 207                                              TALLOC_CTX *mem_ctx,
 208                                              uint8_t **out_data,
 209                                              size_t *out_length,
 210                                              uint32_t *out_flags)
 211 {
 212         struct dcerpc_binding_handle_raw_call_state *state =
 213                 tevent_req_data(req,
 214                 struct dcerpc_binding_handle_raw_call_state);
 215         NTSTATUS error;
 216
 217         if (tevent_req_is_nterror(req, &error)) {
 218                 tevent_req_received(req);
 219                 return error;
 220         }
 221
 222         *out_data = talloc_move(mem_ctx, &state->out_data);
 223         *out_length = state->out_length;
 224         *out_flags = state->out_flags;
 225         tevent_req_received(req);
 226         return NT_STATUS_OK;
 227 }
 228
 229 NTSTATUS dcerpc_binding_handle_raw_call(struct dcerpc_binding_handle *h,
 230                                         const struct GUID *object,
 231                                         uint32_t opnum,
 232                                         uint32_t in_flags,
 233                                         const uint8_t *in_data,
 234                                         size_t in_length,
 235                                         TALLOC_CTX *mem_ctx,
 236                                         uint8_t **out_data,
 237                                         size_t *out_length,
 238                                         uint32_t *out_flags)
 239 {
 240         TALLOC_CTX *frame = talloc_stackframe();
 241         struct tevent_context *ev;
 242         struct tevent_req *subreq;
 243         NTSTATUS status = NT_STATUS_NO_MEMORY;
 244
 245         /*
 246          * TODO: allow only one sync call
 247          */
 248
 249         if (h->sync_ev) {
 250                 ev = h->sync_ev;
 251         } else {
 252                 ev = samba_tevent_context_init(frame);
 253         }
 254         if (ev == NULL) {
 255                 goto fail;
 256         }
 257
 258         subreq = dcerpc_binding_handle_raw_call_send(frame, ev,
 259                                                      h, object, opnum,
 260                                                      in_flags,
 261                                                      in_data,
 262                                                      in_length);
 263         if (subreq == NULL) {
 264                 goto fail;
 265         }
 266
 267         if (!tevent_req_poll_ntstatus(subreq, ev, &status)) {
 268                 goto fail;
 269         }
 270
 271         status = dcerpc_binding_handle_raw_call_recv(subreq,
 272                                                      mem_ctx,
 273                                                      out_data,
 274                                                      out_length,
 275                                                      out_flags);
 276 fail:
 277         TALLOC_FREE(frame);
 278         return status;
 279 }
 280
 281 struct dcerpc_binding_handle_disconnect_state {
 282         const struct dcerpc_binding_handle_ops *ops;
 283 };
 284
 285 static void dcerpc_binding_handle_disconnect_done(struct tevent_req *subreq);
 286
 287 struct tevent_req *dcerpc_binding_handle_disconnect_send(TALLOC_CTX *mem_ctx,
 288                                                 struct tevent_context *ev,
 289                                                 struct dcerpc_binding_handle *h)
 290 {
 291         struct tevent_req *req;
 292         struct dcerpc_binding_handle_disconnect_state *state;
 293         struct tevent_req *subreq;
 294
 295         req = tevent_req_create(mem_ctx, &state,
 296                                 struct dcerpc_binding_handle_disconnect_state);
 297         if (req == NULL) {
 298                 return NULL;
 299         }
 300
 301         state->ops = h->ops;
 302
 303         subreq = state->ops->disconnect_send(state, ev, h);
 304         if (tevent_req_nomem(subreq, req)) {
 305                 return tevent_req_post(req, ev);
 306         }
 307         tevent_req_set_callback(subreq, dcerpc_binding_handle_disconnect_done, req);
 308
 309         return req;
 310 }
 311
 312 static void dcerpc_binding_handle_disconnect_done(struct tevent_req *subreq)
 313 {
 314         struct tevent_req *req = tevent_req_callback_data(subreq,
 315                                  struct tevent_req);
 316         struct dcerpc_binding_handle_disconnect_state *state =
 317                 tevent_req_data(req,
 318                 struct dcerpc_binding_handle_disconnect_state);
 319         NTSTATUS error;
 320
 321         error = state->ops->disconnect_recv(subreq);
 322         TALLOC_FREE(subreq);
 323         if (tevent_req_nterror(req, error)) {
 324                 return;
 325         }
 326
 327         tevent_req_done(req);
 328 }
 329
 330 NTSTATUS dcerpc_binding_handle_disconnect_recv(struct tevent_req *req)
 331 {
 332         NTSTATUS error;
 333
 334         if (tevent_req_is_nterror(req, &error)) {
 335                 tevent_req_received(req);
 336                 return error;
 337         }
 338
 339         tevent_req_received(req);
 340         return NT_STATUS_OK;
 341 }
 342
 343 struct dcerpc_binding_handle_call_state {
 344         struct dcerpc_binding_handle *h;
 345         const struct ndr_interface_call *call;
 346         TALLOC_CTX *r_mem;
 347         void *r_ptr;
 348         struct ndr_push *push;
 349         DATA_BLOB request;
 350         DATA_BLOB response;
 351         struct ndr_pull *pull;
 352 };
 353
 354 static void dcerpc_binding_handle_call_done(struct tevent_req *subreq);
 355
 356 struct tevent_req *dcerpc_binding_handle_call_send(TALLOC_CTX *mem_ctx,
 357                                         struct tevent_context *ev,
 358                                         struct dcerpc_binding_handle *h,
 359                                         const struct GUID *object,
 360                                         const struct ndr_interface_table *table,
 361                                         uint32_t opnum,
 362                                         TALLOC_CTX *r_mem,
 363                                         void *r_ptr)
 364 {
 365         struct tevent_req *req;
 366         struct dcerpc_binding_handle_call_state *state;
 367         struct tevent_req *subreq;
 368         enum ndr_err_code ndr_err;
 369
 370         req = tevent_req_create(mem_ctx, &state,
 371                                 struct dcerpc_binding_handle_call_state);
 372         if (req == NULL) {
 373                 return NULL;
 374         }
 375
 376         if (table != h->table) {
 377                 tevent_req_nterror(req, NT_STATUS_INVALID_HANDLE);
 378                 return tevent_req_post(req, ev);
 379         }
 380
 381         if (opnum >= table->num_calls) {
 382                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 383                 return tevent_req_post(req, ev);
 384         }
 385
 386         state->h = h;
 387         state->call = &table->calls[opnum];
 388
 389         state->r_mem = r_mem;
 390         state->r_ptr = r_ptr;
 391
 392         /* setup for a ndr_push_* call */
 393         state->push = ndr_push_init_ctx(state);
 394         if (tevent_req_nomem(state->push, req)) {
 395                 return tevent_req_post(req, ev);
 396         }
 397
 398         if (h->ops->ref_alloc && h->ops->ref_alloc(h)) {
 399                 state->push->flags |= LIBNDR_FLAG_REF_ALLOC;
 400         }
 401
 402         if (h->ops->push_bigendian && h->ops->push_bigendian(h)) {
 403                 state->push->flags |= LIBNDR_FLAG_BIGENDIAN;
 404         }
 405
 406         if (h->ops->use_ndr64 && h->ops->use_ndr64(h)) {
 407                 state->push->flags |= LIBNDR_FLAG_NDR64;
 408         }
 409
 410         if (h->ops->do_ndr_print) {
 411                 h->ops->do_ndr_print(h, NDR_IN | NDR_SET_VALUES,
 412                                      state->r_ptr, state->call);
 413         }
 414
 415         /* push the structure into a blob */
 416         ndr_err = state->call->ndr_push(state->push, NDR_IN, state->r_ptr);
 417         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 418                 NTSTATUS error;
 419                 error = ndr_map_error2ntstatus(ndr_err);
 420                 if (h->ops->ndr_push_failed) {
 421                         h->ops->ndr_push_failed(h, error,
 422                                                 state->r_ptr,
 423                                                 state->call);
 424                 }
 425                 tevent_req_nterror(req, error);
 426                 return tevent_req_post(req, ev);
 427         }
 428
 429         /* retrieve the blob */
 430         state->request = ndr_push_blob(state->push);
 431
 432         if (h->ops->ndr_validate_in) {
 433                 NTSTATUS error;
 434                 error = h->ops->ndr_validate_in(h, state,
 435                                                 &state->request,
 436                                                 state->call);
 437                 if (!NT_STATUS_IS_OK(error)) {
 438                         tevent_req_nterror(req, error);
 439                         return tevent_req_post(req, ev);
 440                 }
 441         }
 442
 443         subreq = dcerpc_binding_handle_raw_call_send(state, ev,
 444                                                      h, object, opnum,
 445                                                      state->push->flags,
 446                                                      state->request.data,
 447                                                      state->request.length);
 448         if (tevent_req_nomem(subreq, req)) {
 449                 return tevent_req_post(req, ev);
 450         }
 451         tevent_req_set_callback(subreq, dcerpc_binding_handle_call_done, req);
 452
 453         return req;
 454 }
 455
 456 static void dcerpc_binding_handle_call_done(struct tevent_req *subreq)
 457 {
 458         struct tevent_req *req = tevent_req_callback_data(subreq,
 459                                  struct tevent_req);
 460         struct dcerpc_binding_handle_call_state *state =
 461                 tevent_req_data(req,
 462                 struct dcerpc_binding_handle_call_state);
 463         struct dcerpc_binding_handle *h = state->h;
 464         NTSTATUS error;
 465         uint32_t out_flags = 0;
 466         enum ndr_err_code ndr_err;
 467
 468         error = dcerpc_binding_handle_raw_call_recv(subreq, state,
 469                                                     &state->response.data,
 470                                                     &state->response.length,
 471                                                     &out_flags);
 472         TALLOC_FREE(subreq);
 473         if (tevent_req_nterror(req, error)) {
 474                 return;
 475         }
 476
 477         state->pull = ndr_pull_init_blob(&state->response, state);
 478         if (tevent_req_nomem(state->pull, req)) {
 479                 return;
 480         }
 481         state->pull->flags = state->push->flags;
 482
 483         if (out_flags & LIBNDR_FLAG_BIGENDIAN) {
 484                 state->pull->flags |= LIBNDR_FLAG_BIGENDIAN;
 485         } else {
 486                 state->pull->flags &= ~LIBNDR_FLAG_BIGENDIAN;
 487         }
 488
 489         state->pull->current_mem_ctx = state->r_mem;
 490
 491         /* pull the structure from the blob */
 492         ndr_err = state->call->ndr_pull(state->pull, NDR_OUT, state->r_ptr);
 493         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 494                 error = ndr_map_error2ntstatus(ndr_err);
 495                 if (h->ops->ndr_pull_failed) {
 496                         h->ops->ndr_pull_failed(h, error,
 497                                                 &state->response,
 498                                                 state->call);
 499                 }
 500                 tevent_req_nterror(req, error);
 501                 return;
 502         }
 503
 504         if (h->ops->do_ndr_print) {
 505                 h->ops->do_ndr_print(h, NDR_OUT,
 506                                      state->r_ptr, state->call);
 507         }
 508
 509         if (h->ops->ndr_validate_out) {
 510                 error = h->ops->ndr_validate_out(h,
 511                                                  state->pull,
 512                                                  state->r_ptr,
 513                                                  state->call);
 514                 if (!NT_STATUS_IS_OK(error)) {
 515                         tevent_req_nterror(req, error);
 516                         return;
 517                 }
 518         }
 519
 520         tevent_req_done(req);
 521 }
 522
 523 NTSTATUS dcerpc_binding_handle_call_recv(struct tevent_req *req)
 524 {
 525         return tevent_req_simple_recv_ntstatus(req);
 526 }
 527
 528 NTSTATUS dcerpc_binding_handle_call(struct dcerpc_binding_handle *h,
 529                                     const struct GUID *object,
 530                                     const struct ndr_interface_table *table,
 531                                     uint32_t opnum,
 532                                     TALLOC_CTX *r_mem,
 533                                     void *r_ptr)
 534 {
 535         TALLOC_CTX *frame = talloc_stackframe();
 536         struct tevent_context *ev;
 537         struct tevent_req *subreq;
 538         NTSTATUS status = NT_STATUS_NO_MEMORY;
 539
 540         /*
 541          * TODO: allow only one sync call
 542          */
 543
 544         if (h->sync_ev) {
 545                 ev = h->sync_ev;
 546         } else {
 547                 ev = samba_tevent_context_init(frame);
 548         }
 549         if (ev == NULL) {
 550                 goto fail;
 551         }
 552
 553         subreq = dcerpc_binding_handle_call_send(frame, ev,
 554                                                  h, object, table,
 555                                                  opnum, r_mem, r_ptr);
 556         if (subreq == NULL) {
 557                 goto fail;
 558         }
 559
 560         if (!tevent_req_poll_ntstatus(subreq, ev, &status)) {
 561                 goto fail;
 562         }
 563
 564         status = dcerpc_binding_handle_call_recv(subreq);
 565 fail:
 566         TALLOC_FREE(frame);
 567         return status;
 568 }