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 struct dcerpc_binding_handle_raw_call_state {
 102         const struct dcerpc_binding_handle_ops *ops;
 103         uint8_t *out_data;
 104         size_t out_length;
 105         uint32_t out_flags;
 106 };
 107
 108 static void dcerpc_binding_handle_raw_call_done(struct tevent_req *subreq);
 109
 110 struct tevent_req *dcerpc_binding_handle_raw_call_send(TALLOC_CTX *mem_ctx,
 111                                                 struct tevent_context *ev,
 112                                                 struct dcerpc_binding_handle *h,
 113                                                 const struct GUID *object,
 114                                                 uint32_t opnum,
 115                                                 uint32_t in_flags,
 116                                                 const uint8_t *in_data,
 117                                                 size_t in_length)
 118 {
 119         struct tevent_req *req;
 120         struct dcerpc_binding_handle_raw_call_state *state;
 121         struct tevent_req *subreq;
 122
 123         req = tevent_req_create(mem_ctx, &state,
 124                                 struct dcerpc_binding_handle_raw_call_state);
 125         if (req == NULL) {
 126                 return NULL;
 127         }
 128         state->ops = h->ops;
 129         state->out_data = NULL;
 130         state->out_length = 0;
 131         state->out_flags = 0;
 132
 133         subreq = state->ops->raw_call_send(state, ev, h,
 134                                            object, opnum,
 135                                            in_flags, in_data, in_length);
 136         if (tevent_req_nomem(subreq, req)) {
 137                 return tevent_req_post(req, ev);
 138         }
 139         tevent_req_set_callback(subreq, dcerpc_binding_handle_raw_call_done, req);
 140
 141         return req;
 142 }
 143
 144 static void dcerpc_binding_handle_raw_call_done(struct tevent_req *subreq)
 145 {
 146         struct tevent_req *req = tevent_req_callback_data(subreq,
 147                                  struct tevent_req);
 148         struct dcerpc_binding_handle_raw_call_state *state =
 149                 tevent_req_data(req,
 150                 struct dcerpc_binding_handle_raw_call_state);
 151         NTSTATUS error;
 152
 153         error = state->ops->raw_call_recv(subreq, state,
 154                                           &state->out_data,
 155                                           &state->out_length,
 156                                           &state->out_flags);
 157         TALLOC_FREE(subreq);
 158         if (!NT_STATUS_IS_OK(error)) {
 159                 tevent_req_nterror(req, error);
 160                 return;
 161         }
 162
 163         tevent_req_done(req);
 164 }
 165
 166 NTSTATUS dcerpc_binding_handle_raw_call_recv(struct tevent_req *req,
 167                                              TALLOC_CTX *mem_ctx,
 168                                              uint8_t **out_data,
 169                                              size_t *out_length,
 170                                              uint32_t *out_flags)
 171 {
 172         struct dcerpc_binding_handle_raw_call_state *state =
 173                 tevent_req_data(req,
 174                 struct dcerpc_binding_handle_raw_call_state);
 175         NTSTATUS error;
 176
 177         if (tevent_req_is_nterror(req, &error)) {
 178                 tevent_req_received(req);
 179                 return error;
 180         }
 181
 182         *out_data = talloc_move(mem_ctx, &state->out_data);
 183         *out_length = state->out_length;
 184         *out_flags = state->out_flags;
 185         tevent_req_received(req);
 186         return NT_STATUS_OK;
 187 }
 188
 189 struct dcerpc_binding_handle_disconnect_state {
 190         const struct dcerpc_binding_handle_ops *ops;
 191 };
 192
 193 static void dcerpc_binding_handle_disconnect_done(struct tevent_req *subreq);
 194
 195 struct tevent_req *dcerpc_binding_handle_disconnect_send(TALLOC_CTX *mem_ctx,
 196                                                 struct tevent_context *ev,
 197                                                 struct dcerpc_binding_handle *h)
 198 {
 199         struct tevent_req *req;
 200         struct dcerpc_binding_handle_disconnect_state *state;
 201         struct tevent_req *subreq;
 202
 203         req = tevent_req_create(mem_ctx, &state,
 204                                 struct dcerpc_binding_handle_disconnect_state);
 205         if (req == NULL) {
 206                 return NULL;
 207         }
 208
 209         state->ops = h->ops;
 210
 211         subreq = state->ops->disconnect_send(state, ev, h);
 212         if (tevent_req_nomem(subreq, req)) {
 213                 return tevent_req_post(req, ev);
 214         }
 215         tevent_req_set_callback(subreq, dcerpc_binding_handle_disconnect_done, req);
 216
 217         return req;
 218 }
 219
 220 static void dcerpc_binding_handle_disconnect_done(struct tevent_req *subreq)
 221 {
 222         struct tevent_req *req = tevent_req_callback_data(subreq,
 223                                  struct tevent_req);
 224         struct dcerpc_binding_handle_disconnect_state *state =
 225                 tevent_req_data(req,
 226                 struct dcerpc_binding_handle_disconnect_state);
 227         NTSTATUS error;
 228
 229         error = state->ops->disconnect_recv(subreq);
 230         TALLOC_FREE(subreq);
 231         if (!NT_STATUS_IS_OK(error)) {
 232                 tevent_req_nterror(req, error);
 233                 return;
 234         }
 235
 236         tevent_req_done(req);
 237 }
 238
 239 NTSTATUS dcerpc_binding_handle_disconnect_recv(struct tevent_req *req)
 240 {
 241         NTSTATUS error;
 242
 243         if (tevent_req_is_nterror(req, &error)) {
 244                 tevent_req_received(req);
 245                 return error;
 246         }
 247
 248         tevent_req_received(req);
 249         return NT_STATUS_OK;
 250 }
 251
 252 struct dcerpc_binding_handle_call_state {
 253         struct dcerpc_binding_handle *h;
 254         const struct ndr_interface_call *call;
 255         TALLOC_CTX *r_mem;
 256         void *r_ptr;
 257         struct ndr_push *push;
 258         DATA_BLOB request;
 259         DATA_BLOB response;
 260         struct ndr_pull *pull;
 261 };
 262
 263 static void dcerpc_binding_handle_call_done(struct tevent_req *subreq);
 264
 265 struct tevent_req *dcerpc_binding_handle_call_send(TALLOC_CTX *mem_ctx,
 266                                         struct tevent_context *ev,
 267                                         struct dcerpc_binding_handle *h,
 268                                         const struct GUID *object,
 269                                         const struct ndr_interface_table *table,
 270                                         uint32_t opnum,
 271                                         TALLOC_CTX *r_mem,
 272                                         void *r_ptr)
 273 {
 274         struct tevent_req *req;
 275         struct dcerpc_binding_handle_call_state *state;
 276         struct tevent_req *subreq;
 277         enum ndr_err_code ndr_err;
 278
 279         req = tevent_req_create(mem_ctx, &state,
 280                                 struct dcerpc_binding_handle_call_state);
 281         if (req == NULL) {
 282                 return NULL;
 283         }
 284
 285 #if 0 /* TODO: activate this when the callers are fixed */
 286         if (table != h->table) {
 287                 tevent_req_nterror(req, NT_STATUS_INVALID_HANDLE);
 288                 return tevent_req_post(req, ev);
 289         }
 290 #endif
 291
 292         if (opnum >= table->num_calls) {
 293                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 294                 return tevent_req_post(req, ev);
 295         }
 296
 297         state->h = h;
 298         state->call = &table->calls[opnum];
 299
 300         state->r_mem = r_mem;
 301         state->r_ptr = r_ptr;
 302
 303         /* setup for a ndr_push_* call */
 304         state->push = ndr_push_init_ctx(state);
 305         if (tevent_req_nomem(state->push, req)) {
 306                 return tevent_req_post(req, ev);
 307         }
 308
 309         if (h->ops->ref_alloc && h->ops->ref_alloc(h)) {
 310                 state->push->flags |= LIBNDR_FLAG_REF_ALLOC;
 311         }
 312
 313         if (h->ops->push_bigendian && h->ops->push_bigendian(h)) {
 314                 state->push->flags |= LIBNDR_FLAG_BIGENDIAN;
 315         }
 316
 317         if (h->ops->use_ndr64 && h->ops->use_ndr64(h)) {
 318                 state->push->flags |= LIBNDR_FLAG_NDR64;
 319         }
 320
 321         if (h->ops->do_ndr_print) {
 322                 h->ops->do_ndr_print(h, NDR_IN | NDR_SET_VALUES,
 323                                      state->r_ptr, state->call);
 324         }
 325
 326         /* push the structure into a blob */
 327         ndr_err = state->call->ndr_push(state->push, NDR_IN, state->r_ptr);
 328         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 329                 NTSTATUS error;
 330                 error = ndr_map_error2ntstatus(ndr_err);
 331                 if (h->ops->ndr_push_failed) {
 332                         h->ops->ndr_push_failed(h, error,
 333                                                 state->r_ptr,
 334                                                 state->call);
 335                 }
 336                 tevent_req_nterror(req, error);
 337                 return tevent_req_post(req, ev);
 338         }
 339
 340         /* retrieve the blob */
 341         state->request = ndr_push_blob(state->push);
 342
 343         if (h->ops->ndr_validate_in) {
 344                 NTSTATUS error;
 345                 error = h->ops->ndr_validate_in(h, state,
 346                                                 &state->request,
 347                                                 state->call);
 348                 if (!NT_STATUS_IS_OK(error)) {
 349                         tevent_req_nterror(req, error);
 350                         return tevent_req_post(req, ev);
 351                 }
 352         }
 353
 354         subreq = dcerpc_binding_handle_raw_call_send(state, ev,
 355                                                      h, object, opnum,
 356                                                      state->push->flags,
 357                                                      state->request.data,
 358                                                      state->request.length);
 359         if (tevent_req_nomem(subreq, req)) {
 360                 return tevent_req_post(req, ev);
 361         }
 362         tevent_req_set_callback(subreq, dcerpc_binding_handle_call_done, req);
 363
 364         return req;
 365 }
 366
 367 static void dcerpc_binding_handle_call_done(struct tevent_req *subreq)
 368 {
 369         struct tevent_req *req = tevent_req_callback_data(subreq,
 370                                  struct tevent_req);
 371         struct dcerpc_binding_handle_call_state *state =
 372                 tevent_req_data(req,
 373                 struct dcerpc_binding_handle_call_state);
 374         struct dcerpc_binding_handle *h = state->h;
 375         NTSTATUS error;
 376         uint32_t out_flags = 0;
 377         enum ndr_err_code ndr_err;
 378
 379         error = dcerpc_binding_handle_raw_call_recv(subreq, state,
 380                                                     &state->response.data,
 381                                                     &state->response.length,
 382                                                     &out_flags);
 383         TALLOC_FREE(subreq);
 384         if (!NT_STATUS_IS_OK(error)) {
 385                 tevent_req_nterror(req, error);
 386                 return;
 387         }
 388
 389         state->pull = ndr_pull_init_blob(&state->response, state);
 390         if (tevent_req_nomem(state->pull, req)) {
 391                 return;
 392         }
 393         state->pull->flags = state->push->flags;
 394
 395         if (out_flags & LIBNDR_FLAG_BIGENDIAN) {
 396                 state->pull->flags |= LIBNDR_FLAG_BIGENDIAN;
 397         } else {
 398                 state->pull->flags &= ~LIBNDR_FLAG_BIGENDIAN;
 399         }
 400
 401         state->pull->current_mem_ctx = state->r_mem;
 402
 403         /* pull the structure from the blob */
 404         ndr_err = state->call->ndr_pull(state->pull, NDR_OUT, state->r_ptr);
 405         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 406                 error = ndr_map_error2ntstatus(ndr_err);
 407                 if (h->ops->ndr_pull_failed) {
 408                         h->ops->ndr_pull_failed(h, error,
 409                                                 &state->response,
 410                                                 state->call);
 411                 }
 412                 tevent_req_nterror(req, error);
 413                 return;
 414         }
 415
 416         if (h->ops->do_ndr_print) {
 417                 h->ops->do_ndr_print(h, NDR_OUT,
 418                                      state->r_ptr, state->call);
 419         }
 420
 421         if (h->ops->ndr_validate_out) {
 422                 error = h->ops->ndr_validate_out(h,
 423                                                  state->pull,
 424                                                  state->r_ptr,
 425                                                  state->call);
 426                 if (!NT_STATUS_IS_OK(error)) {
 427                         tevent_req_nterror(req, error);
 428                         return;
 429                 }
 430         }
 431
 432         tevent_req_done(req);
 433 }
 434
 435 NTSTATUS dcerpc_binding_handle_call_recv(struct tevent_req *req)
 436 {
 437         NTSTATUS error;
 438
 439         if (tevent_req_is_nterror(req, &error)) {
 440                 tevent_req_received(req);
 441                 return error;
 442         }
 443
 444         tevent_req_received(req);
 445         return NT_STATUS_OK;
 446 }
 447
 448 NTSTATUS dcerpc_binding_handle_call(struct dcerpc_binding_handle *h,
 449                                     const struct GUID *object,
 450                                     const struct ndr_interface_table *table,
 451                                     uint32_t opnum,
 452                                     TALLOC_CTX *r_mem,
 453                                     void *r_ptr)
 454 {
 455         TALLOC_CTX *frame = talloc_stackframe();
 456         struct tevent_context *ev;
 457         struct tevent_req *subreq;
 458         NTSTATUS status;
 459
 460         /*
 461          * TODO: allow only one sync call
 462          */
 463
 464         if (h->sync_ev) {
 465                 ev = h->sync_ev;
 466         } else {
 467                 ev = tevent_context_init(frame);
 468         }
 469         if (ev == NULL) {
 470                 talloc_free(frame);
 471                 return NT_STATUS_NO_MEMORY;
 472         }
 473
 474         subreq = dcerpc_binding_handle_call_send(frame, ev,
 475                                                  h, object, table,
 476                                                  opnum, r_mem, r_ptr);
 477         if (subreq == NULL) {
 478                 talloc_free(frame);
 479                 return NT_STATUS_NO_MEMORY;
 480         }
 481
 482         if (!tevent_req_poll(subreq, ev)) {
 483                 status = map_nt_error_from_unix(errno);
 484                 talloc_free(frame);
 485                 return status;
 486         }
 487
 488         status = dcerpc_binding_handle_call_recv(subreq);
 489         if (!NT_STATUS_IS_OK(status)) {
 490                 talloc_free(frame);
 491                 return status;
 492         }
 493
 494         TALLOC_FREE(frame);
 495         return NT_STATUS_OK;
 496 }