source4/rpc_server/remote/dcesrv_remote.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    remote dcerpc operations
   4
   5    Copyright (C) Stefan (metze) Metzmacher 2004
   6    Copyright (C) Julien Kerihuel 2008-2009
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2010
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include <tevent.h>
  25 #include "rpc_server/dcerpc_server.h"
  26 #include "auth/auth.h"
  27 #include "auth/credentials/credentials.h"
  28 #include "librpc/ndr/ndr_table.h"
  29 #include "param/param.h"
  30
  31 NTSTATUS dcerpc_server_remote_init(TALLOC_CTX *ctx);
  32
  33 #define DCESRV_REMOTE_ASSOC_MAGIC 0x782f50c4
  34 struct dcesrv_remote_assoc {
  35         uint32_t assoc_group_id;
  36 };
  37
  38 #define DCESRV_REMOTE_PRIVATE_MAGIC 0x7eceafa6
  39 struct dcesrv_remote_private {
  40         struct dcerpc_pipe *c_pipe;
  41 };
  42
  43 static NTSTATUS remote_op_reply(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
  44 {
  45         return NT_STATUS_OK;
  46 }
  47
  48 static NTSTATUS remote_op_bind(struct dcesrv_connection_context *context,
  49                                const struct dcesrv_interface *iface)
  50 {
  51         return NT_STATUS_OK;
  52 }
  53
  54 static NTSTATUS remote_get_private(struct dcesrv_call_state *dce_call,
  55                                    struct dcesrv_remote_private **_priv)
  56 {
  57         const struct ndr_interface_table *table =
  58                 (const struct ndr_interface_table *)dce_call->context->iface->private_data;
  59         struct dcesrv_remote_private *priv = NULL;
  60         struct dcesrv_remote_assoc *assoc = NULL;
  61         const char *binding = NULL;
  62         const char *user, *pass, *domain;
  63         struct cli_credentials *credentials;
  64         bool must_free_credentials = false;
  65         bool machine_account;
  66         bool allow_anonymous;
  67         struct dcerpc_binding           *b;
  68         struct composite_context        *pipe_conn_req;
  69         uint32_t flags = 0;
  70         NTSTATUS status;
  71
  72         priv = dcesrv_iface_state_find_conn(dce_call,
  73                                             DCESRV_REMOTE_PRIVATE_MAGIC,
  74                                             struct dcesrv_remote_private);
  75         if (priv != NULL) {
  76                 *_priv = priv;
  77                 return NT_STATUS_OK;
  78         }
  79
  80         priv = talloc_zero(dce_call, struct dcesrv_remote_private);
  81         if (priv == NULL) {
  82                 return NT_STATUS_NO_MEMORY;
  83         }
  84
  85         assoc = dcesrv_iface_state_find_assoc(dce_call,
  86                                         DCESRV_REMOTE_ASSOC_MAGIC,
  87                                         struct dcesrv_remote_assoc);
  88         if (assoc == NULL) {
  89                 assoc = talloc_zero(dce_call, struct dcesrv_remote_assoc);
  90                 if (assoc == NULL) {
  91                         return NT_STATUS_NO_MEMORY;
  92                 }
  93         }
  94
  95         binding = lpcfg_parm_string(dce_call->conn->dce_ctx->lp_ctx,
  96                                     NULL,
  97                                     "dcerpc_remote",
  98                                     "binding");
  99         if (binding == NULL) {
 100                 DEBUG(0,("You must specify a DCE/RPC binding string\n"));
 101                 return NT_STATUS_INVALID_PARAMETER;
 102         }
 103
 104         user = lpcfg_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dcerpc_remote", "user");
 105         pass = lpcfg_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dcerpc_remote", "password");
 106         domain = lpcfg_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dceprc_remote", "domain");
 107
 108         machine_account = lpcfg_parm_bool(dce_call->conn->dce_ctx->lp_ctx,
 109                                           NULL,
 110                                           "dcerpc_remote",
 111                                           "use_machine_account",
 112                                           false);
 113         allow_anonymous = lpcfg_parm_bool(dce_call->conn->dce_ctx->lp_ctx,
 114                                           NULL,
 115                                           "dcerpc_remote",
 116                                           "allow_anonymous_fallback",
 117                                           false);
 118
 119         credentials = dcesrv_call_credentials(dce_call);
 120
 121         if (user && pass) {
 122                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using specified account\n"));
 123                 credentials = cli_credentials_init(priv);
 124                 if (!credentials) {
 125                         return NT_STATUS_NO_MEMORY;
 126                 }
 127                 must_free_credentials = true;
 128                 cli_credentials_set_conf(credentials, dce_call->conn->dce_ctx->lp_ctx);
 129                 cli_credentials_set_username(credentials, user, CRED_SPECIFIED);
 130                 if (domain) {
 131                         cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
 132                 }
 133                 cli_credentials_set_password(credentials, pass, CRED_SPECIFIED);
 134         } else if (machine_account) {
 135                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using machine account\n"));
 136                 credentials = cli_credentials_init(priv);
 137                 if (!credentials) {
 138                         return NT_STATUS_NO_MEMORY;
 139                 }
 140                 must_free_credentials = true;
 141                 cli_credentials_set_conf(credentials, dce_call->conn->dce_ctx->lp_ctx);
 142                 if (domain) {
 143                         cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
 144                 }
 145                 status = cli_credentials_set_machine_account(credentials, dce_call->conn->dce_ctx->lp_ctx);
 146                 if (!NT_STATUS_IS_OK(status)) {
 147                         return status;
 148                 }
 149         } else if (credentials != NULL) {
 150                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using delegated credentials\n"));
 151         } else if (allow_anonymous) {
 152                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using anonymous\n"));
 153                 credentials = cli_credentials_init_anon(priv);
 154                 if (!credentials) {
 155                         return NT_STATUS_NO_MEMORY;
 156                 }
 157                 must_free_credentials = true;
 158         } else {
 159                 DEBUG(1,("dcerpc_remote: RPC Proxy: You must supply binding, user and password or have delegated credentials\n"));
 160                 return NT_STATUS_INVALID_PARAMETER;
 161         }
 162
 163         /* parse binding string to the structure */
 164         status = dcerpc_parse_binding(priv, binding, &b);
 165         if (!NT_STATUS_IS_OK(status)) {
 166                 DEBUG(0, ("Failed to parse dcerpc binding '%s'\n", binding));
 167                 return status;
 168         }
 169
 170         /* If we already have a remote association group ID, then use that */
 171         if (assoc->assoc_group_id != 0) {
 172                 status = dcerpc_binding_set_assoc_group_id(b,
 173                         assoc->assoc_group_id);
 174                 if (!NT_STATUS_IS_OK(status)) {
 175                         DEBUG(0, ("dcerpc_binding_set_assoc_group_id() - %s'\n",
 176                                   nt_errstr(status)));
 177                         return status;
 178                 }
 179         }
 180
 181         status = dcerpc_binding_set_abstract_syntax(b, &table->syntax_id);
 182         if (!NT_STATUS_IS_OK(status)) {
 183                 DEBUG(0, ("dcerpc_binding_set_abstract_syntax() - %s'\n",
 184                           nt_errstr(status)));
 185                 return status;
 186         }
 187
 188         if (dce_call->conn->state_flags & DCESRV_CALL_STATE_FLAG_MULTIPLEXED) {
 189                 status = dcerpc_binding_set_flags(b, DCERPC_CONCURRENT_MULTIPLEX, 0);
 190                 if (!NT_STATUS_IS_OK(status)) {
 191                         DEBUG(0, ("dcerpc_binding_set_flags(CONC_MPX) - %s'\n",
 192                                   nt_errstr(status)));
 193                         return status;
 194                 }
 195         }
 196
 197         DEBUG(3, ("Using binding %s\n", dcerpc_binding_string(dce_call->context, b)));
 198
 199         pipe_conn_req = dcerpc_pipe_connect_b_send(priv, b, table,
 200                                                    credentials, dce_call->event_ctx, dce_call->conn->dce_ctx->lp_ctx);
 201         status = dcerpc_pipe_connect_b_recv(pipe_conn_req, priv, &(priv->c_pipe));
 202
 203         if (must_free_credentials) {
 204                 talloc_free(credentials);
 205         }
 206
 207         if (!NT_STATUS_IS_OK(status)) {
 208                 return status;
 209         }
 210
 211         if (dce_call->conn->state_flags & DCESRV_CALL_STATE_FLAG_MULTIPLEXED) {
 212                 flags = dcerpc_binding_get_flags(priv->c_pipe->binding);
 213                 if (!(flags & DCERPC_CONCURRENT_MULTIPLEX)) {
 214                         DEBUG(1,("dcerpc_remote: RPC Proxy: "
 215                                  "Remote server doesn't support MPX\n"));
 216                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
 217                 }
 218         }
 219
 220         if (assoc->assoc_group_id == 0) {
 221                 assoc->assoc_group_id =
 222                         dcerpc_binding_get_assoc_group_id(priv->c_pipe->binding);
 223                 if (assoc->assoc_group_id == 0) {
 224                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
 225                 }
 226
 227                 status = dcesrv_iface_state_store_assoc(dce_call,
 228                                                 DCESRV_REMOTE_ASSOC_MAGIC,
 229                                                 assoc);
 230                 if (!NT_STATUS_IS_OK(status)) {
 231                         return status;
 232                 }
 233         }
 234
 235         status = dcesrv_iface_state_store_conn(dce_call,
 236                                         DCESRV_REMOTE_PRIVATE_MAGIC,
 237                                         priv);
 238         if (!NT_STATUS_IS_OK(status)) {
 239                 return status;
 240         }
 241
 242         *_priv = priv;
 243         return NT_STATUS_OK;
 244 }
 245
 246 static NTSTATUS remote_op_ndr_pull(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_pull *pull, void **r)
 247 {
 248         enum ndr_err_code ndr_err;
 249         const struct ndr_interface_table *table = (const struct ndr_interface_table *)dce_call->context->iface->private_data;
 250         uint16_t opnum = dce_call->pkt.u.request.opnum;
 251
 252         dce_call->fault_code = 0;
 253
 254         if (opnum >= table->num_calls) {
 255                 dce_call->fault_code = DCERPC_FAULT_OP_RNG_ERROR;
 256                 return NT_STATUS_NET_WRITE_FAULT;
 257         }
 258
 259         /*
 260          * We don't have support for calls with pipes.
 261          */
 262         if (table->calls[opnum].in_pipes.num_pipes != 0) {
 263                 dce_call->fault_code = DCERPC_FAULT_OP_RNG_ERROR;
 264                 return NT_STATUS_NET_WRITE_FAULT;
 265         }
 266         if (table->calls[opnum].out_pipes.num_pipes != 0) {
 267                 dce_call->fault_code = DCERPC_FAULT_OP_RNG_ERROR;
 268                 return NT_STATUS_NET_WRITE_FAULT;
 269         }
 270
 271         *r = talloc_size(mem_ctx, table->calls[opnum].struct_size);
 272         if (!*r) {
 273                 return NT_STATUS_NO_MEMORY;
 274         }
 275
 276         /* unravel the NDR for the packet */
 277         ndr_err = table->calls[opnum].ndr_pull(pull, NDR_IN, *r);
 278         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 279                 dcerpc_log_packet(dce_call->conn->packet_log_dir,
 280                                                   table, opnum, NDR_IN,
 281                                   &dce_call->pkt.u.request.stub_and_verifier);
 282                 dce_call->fault_code = DCERPC_FAULT_NDR;
 283                 return NT_STATUS_NET_WRITE_FAULT;
 284         }
 285
 286         return NT_STATUS_OK;
 287 }
 288
 289 static void remote_op_dispatch_done(struct tevent_req *subreq);
 290
 291 struct dcesrv_remote_call {
 292         struct dcesrv_call_state *dce_call;
 293         struct dcesrv_remote_private *priv;
 294 };
 295
 296 static NTSTATUS remote_op_dispatch(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
 297 {
 298         struct dcesrv_remote_call *rcall = NULL;
 299         struct dcesrv_remote_private *priv = NULL;
 300         uint16_t opnum = dce_call->pkt.u.request.opnum;
 301         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 302         const struct ndr_interface_call *call;
 303         const char *name;
 304         struct tevent_req *subreq;
 305         NTSTATUS status;
 306
 307         name = table->calls[opnum].name;
 308         call = &table->calls[opnum];
 309
 310         status = remote_get_private(dce_call, &priv);
 311         if (!NT_STATUS_IS_OK(status)) {
 312                 DEBUG(0,("dcesrv_remote: call[%s] %s\n", name, nt_errstr(status)));
 313                 return status;
 314         }
 315
 316         rcall = talloc_zero(dce_call, struct dcesrv_remote_call);
 317         if (rcall == NULL) {
 318                 return NT_STATUS_NO_MEMORY;
 319         }
 320         rcall->dce_call = dce_call;
 321         rcall->priv = priv;
 322
 323         if (priv->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_IN) {
 324                 ndr_print_function_debug(call->ndr_print, name, NDR_IN | NDR_SET_VALUES, r);
 325         }
 326
 327         priv->c_pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 328
 329         /* we didn't use the return code of this function as we only check the last_fault_code */
 330         subreq = dcerpc_binding_handle_call_send(rcall, dce_call->event_ctx,
 331                                                  priv->c_pipe->binding_handle,
 332                                                  NULL, table,
 333                                                  opnum, mem_ctx, r);
 334         if (subreq == NULL) {
 335                 DEBUG(0,("dcesrv_remote: call[%s] dcerpc_binding_handle_call_send() failed!\n", name));
 336                 return NT_STATUS_NO_MEMORY;
 337         }
 338         tevent_req_set_callback(subreq, remote_op_dispatch_done, rcall);
 339
 340         dce_call->state_flags |= DCESRV_CALL_STATE_FLAG_ASYNC;
 341         return NT_STATUS_OK;
 342 }
 343
 344 static void remote_op_dispatch_done(struct tevent_req *subreq)
 345 {
 346         struct dcesrv_remote_call *rcall =
 347                 tevent_req_callback_data(subreq,
 348                 struct dcesrv_remote_call);
 349         struct dcesrv_call_state *dce_call = rcall->dce_call;
 350         struct dcesrv_remote_private *priv = rcall->priv;
 351         uint16_t opnum = dce_call->pkt.u.request.opnum;
 352         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 353         const struct ndr_interface_call *call;
 354         const char *name;
 355         NTSTATUS status;
 356
 357         name = table->calls[opnum].name;
 358         call = &table->calls[opnum];
 359
 360         /* we didn't use the return code of this function as we only check the last_fault_code */
 361         status = dcerpc_binding_handle_call_recv(subreq);
 362         TALLOC_FREE(subreq);
 363
 364         dce_call->fault_code = priv->c_pipe->last_fault_code;
 365         if (dce_call->fault_code != 0) {
 366                 DEBUG(0,("dcesrv_remote: call[%s] failed with: %s!\n",
 367                         name, dcerpc_errstr(dce_call, dce_call->fault_code)));
 368                 goto reply;
 369         }
 370
 371         if (NT_STATUS_IS_OK(status) &&
 372             (priv->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_OUT)) {
 373                 ndr_print_function_debug(call->ndr_print, name, NDR_OUT, dce_call->r);
 374         }
 375
 376 reply:
 377         status = dcesrv_reply(dce_call);
 378         if (!NT_STATUS_IS_OK(status)) {
 379                 DEBUG(0,("dcesrv_remote: call[%s]: dcesrv_reply() failed - %s\n",
 380                         name, nt_errstr(status)));
 381         }
 382 }
 383
 384 static NTSTATUS remote_op_ndr_push(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_push *push, const void *r)
 385 {
 386         enum ndr_err_code ndr_err;
 387         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 388         uint16_t opnum = dce_call->pkt.u.request.opnum;
 389
 390         /* unravel the NDR for the packet */
 391         ndr_err = table->calls[opnum].ndr_push(push, NDR_OUT, r);
 392         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 393                 dce_call->fault_code = DCERPC_FAULT_NDR;
 394                 return NT_STATUS_NET_WRITE_FAULT;
 395         }
 396
 397         return NT_STATUS_OK;
 398 }
 399
 400 static NTSTATUS remote_register_one_iface(struct dcesrv_context *dce_ctx, const struct dcesrv_interface *iface)
 401 {
 402         unsigned int i;
 403         const struct ndr_interface_table *table = iface->private_data;
 404
 405         for (i=0;i<table->endpoints->count;i++) {
 406                 NTSTATUS ret;
 407                 const char *name = table->endpoints->names[i];
 408
 409                 ret = dcesrv_interface_register(dce_ctx, name, NULL, iface, NULL);
 410                 if (!NT_STATUS_IS_OK(ret)) {
 411                         DEBUG(1,("remote_op_init_server: failed to register endpoint '%s'\n",name));
 412                         return ret;
 413                 }
 414         }
 415
 416         return NT_STATUS_OK;
 417 }
 418
 419 static NTSTATUS remote_op_init_server(struct dcesrv_context *dce_ctx, const struct dcesrv_endpoint_server *ep_server)
 420 {
 421         unsigned int i;
 422         char **ifaces = str_list_make(dce_ctx, lpcfg_parm_string(dce_ctx->lp_ctx, NULL, "dcerpc_remote", "interfaces"),NULL);
 423
 424         if (!ifaces) {
 425                 DEBUG(3,("remote_op_init_server: no interfaces configured\n"));
 426                 return NT_STATUS_OK;
 427         }
 428
 429         for (i=0;ifaces[i];i++) {
 430                 NTSTATUS ret;
 431                 struct dcesrv_interface iface;
 432
 433                 if (!ep_server->interface_by_name(&iface, ifaces[i])) {
 434                         DEBUG(0,("remote_op_init_server: failed to find interface = '%s'\n", ifaces[i]));
 435                         talloc_free(ifaces);
 436                         return NT_STATUS_UNSUCCESSFUL;
 437                 }
 438
 439                 ret = remote_register_one_iface(dce_ctx, &iface);
 440                 if (!NT_STATUS_IS_OK(ret)) {
 441                         DEBUG(0,("remote_op_init_server: failed to register interface = '%s'\n", ifaces[i]));
 442                         talloc_free(ifaces);
 443                         return ret;
 444                 }
 445         }
 446
 447         talloc_free(ifaces);
 448         return NT_STATUS_OK;
 449 }
 450
 451 static bool remote_fill_interface(struct dcesrv_interface *iface, const struct ndr_interface_table *if_tabl)
 452 {
 453         iface->name = if_tabl->name;
 454         iface->syntax_id = if_tabl->syntax_id;
 455
 456         iface->bind = remote_op_bind;
 457         iface->unbind = NULL;
 458
 459         iface->ndr_pull = remote_op_ndr_pull;
 460         iface->dispatch = remote_op_dispatch;
 461         iface->reply = remote_op_reply;
 462         iface->ndr_push = remote_op_ndr_push;
 463
 464         iface->private_data = if_tabl;
 465         iface->flags = 0;
 466
 467         return true;
 468 }
 469
 470 static bool remote_op_interface_by_uuid(struct dcesrv_interface *iface, const struct GUID *uuid, uint32_t if_version)
 471 {
 472         const struct ndr_interface_list *l;
 473
 474         for (l=ndr_table_list();l;l=l->next) {
 475                 if (l->table->syntax_id.if_version == if_version &&
 476                         GUID_equal(&l->table->syntax_id.uuid, uuid)==0) {
 477                         return remote_fill_interface(iface, l->table);
 478                 }
 479         }
 480
 481         return false;
 482 }
 483
 484 static bool remote_op_interface_by_name(struct dcesrv_interface *iface, const char *name)
 485 {
 486         const struct ndr_interface_table *tbl = ndr_table_by_name(name);
 487
 488         if (tbl)
 489                 return remote_fill_interface(iface, tbl);
 490
 491         return false;
 492 }
 493
 494 NTSTATUS dcerpc_server_remote_init(TALLOC_CTX *ctx)
 495 {
 496         NTSTATUS ret;
 497         static const struct dcesrv_endpoint_server ep_server = {
 498                 /* fill in our name */
 499                 .name = "remote",
 500
 501                 /* fill in all the operations */
 502                 .init_server = remote_op_init_server,
 503
 504                 .interface_by_uuid = remote_op_interface_by_uuid,
 505                 .interface_by_name = remote_op_interface_by_name
 506         };
 507
 508         /* register ourselves with the DCERPC subsystem. */
 509         ret = dcerpc_register_ep_server(&ep_server);
 510         if (!NT_STATUS_IS_OK(ret)) {
 511                 DEBUG(0,("Failed to register 'remote' endpoint server!\n"));
 512                 return ret;
 513         }
 514
 515         /* We need the full DCE/RPC interface table */
 516         ndr_table_init();
 517
 518         return ret;
 519 }