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         struct dcerpc_binding_handle_call_params params;
 295 };
 296
 297 static NTSTATUS remote_op_dispatch(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
 298 {
 299         struct dcesrv_remote_call *rcall = NULL;
 300         struct dcesrv_remote_private *priv = NULL;
 301         uint16_t opnum = dce_call->pkt.u.request.opnum;
 302         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 303         const struct ndr_interface_call *call;
 304         const char *name;
 305         struct tevent_req *subreq;
 306         NTSTATUS status;
 307
 308         name = table->calls[opnum].name;
 309         call = &table->calls[opnum];
 310
 311         status = remote_get_private(dce_call, &priv);
 312         if (!NT_STATUS_IS_OK(status)) {
 313                 DEBUG(0,("dcesrv_remote: call[%s] %s\n", name, nt_errstr(status)));
 314                 return status;
 315         }
 316
 317         rcall = talloc_zero(dce_call, struct dcesrv_remote_call);
 318         if (rcall == NULL) {
 319                 return NT_STATUS_NO_MEMORY;
 320         }
 321         rcall->dce_call = dce_call;
 322         rcall->priv = priv;
 323         rcall->params.r_mem = mem_ctx;
 324         rcall->params.r_ptr = r;
 325         rcall->params.in.num_pipes = 0;
 326         rcall->params.in.pipes = NULL;
 327         rcall->params.out.num_pipes = 0;
 328         rcall->params.out.pipes = NULL;
 329
 330         if (priv->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_IN) {
 331                 ndr_print_function_debug(call->ndr_print, name, NDR_IN | NDR_SET_VALUES, r);
 332         }
 333
 334         priv->c_pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 335
 336         /* we didn't use the return code of this function as we only check the last_fault_code */
 337         subreq = dcerpc_binding_handle_call_send(rcall, dce_call->event_ctx,
 338                                                  priv->c_pipe->binding_handle,
 339                                                  NULL, table,
 340                                                  opnum, &rcall->params);
 341         if (subreq == NULL) {
 342                 DEBUG(0,("dcesrv_remote: call[%s] dcerpc_binding_handle_call_send() failed!\n", name));
 343                 return NT_STATUS_NO_MEMORY;
 344         }
 345         tevent_req_set_callback(subreq, remote_op_dispatch_done, rcall);
 346
 347         dce_call->state_flags |= DCESRV_CALL_STATE_FLAG_ASYNC;
 348         return NT_STATUS_OK;
 349 }
 350
 351 static void remote_op_dispatch_done(struct tevent_req *subreq)
 352 {
 353         struct dcesrv_remote_call *rcall =
 354                 tevent_req_callback_data(subreq,
 355                 struct dcesrv_remote_call);
 356         struct dcesrv_call_state *dce_call = rcall->dce_call;
 357         struct dcesrv_remote_private *priv = rcall->priv;
 358         uint16_t opnum = dce_call->pkt.u.request.opnum;
 359         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 360         const struct ndr_interface_call *call;
 361         const char *name;
 362         NTSTATUS status;
 363
 364         name = table->calls[opnum].name;
 365         call = &table->calls[opnum];
 366
 367         /* we didn't use the return code of this function as we only check the last_fault_code */
 368         status = dcerpc_binding_handle_call_recv(subreq);
 369         TALLOC_FREE(subreq);
 370
 371         dce_call->fault_code = priv->c_pipe->last_fault_code;
 372         if (dce_call->fault_code != 0) {
 373                 DEBUG(0,("dcesrv_remote: call[%s] failed with: %s!\n",
 374                         name, dcerpc_errstr(dce_call, dce_call->fault_code)));
 375                 goto reply;
 376         }
 377
 378         if (NT_STATUS_IS_OK(status) &&
 379             (priv->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_OUT)) {
 380                 ndr_print_function_debug(call->ndr_print, name, NDR_OUT, dce_call->r);
 381         }
 382
 383 reply:
 384         status = dcesrv_reply(dce_call);
 385         if (!NT_STATUS_IS_OK(status)) {
 386                 DEBUG(0,("dcesrv_remote: call[%s]: dcesrv_reply() failed - %s\n",
 387                         name, nt_errstr(status)));
 388         }
 389 }
 390
 391 static NTSTATUS remote_op_ndr_push(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_push *push, const void *r)
 392 {
 393         enum ndr_err_code ndr_err;
 394         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 395         uint16_t opnum = dce_call->pkt.u.request.opnum;
 396
 397         /* unravel the NDR for the packet */
 398         ndr_err = table->calls[opnum].ndr_push(push, NDR_OUT, r);
 399         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 400                 dce_call->fault_code = DCERPC_FAULT_NDR;
 401                 return NT_STATUS_NET_WRITE_FAULT;
 402         }
 403
 404         return NT_STATUS_OK;
 405 }
 406
 407 static NTSTATUS remote_register_one_iface(struct dcesrv_context *dce_ctx, const struct dcesrv_interface *iface)
 408 {
 409         unsigned int i;
 410         const struct ndr_interface_table *table = iface->private_data;
 411
 412         for (i=0;i<table->endpoints->count;i++) {
 413                 NTSTATUS ret;
 414                 const char *name = table->endpoints->names[i];
 415
 416                 ret = dcesrv_interface_register(dce_ctx, name, NULL, iface, NULL);
 417                 if (!NT_STATUS_IS_OK(ret)) {
 418                         DEBUG(1,("remote_op_init_server: failed to register endpoint '%s'\n",name));
 419                         return ret;
 420                 }
 421         }
 422
 423         return NT_STATUS_OK;
 424 }
 425
 426 static NTSTATUS remote_op_init_server(struct dcesrv_context *dce_ctx, const struct dcesrv_endpoint_server *ep_server)
 427 {
 428         unsigned int i;
 429         char **ifaces = str_list_make(dce_ctx, lpcfg_parm_string(dce_ctx->lp_ctx, NULL, "dcerpc_remote", "interfaces"),NULL);
 430
 431         if (!ifaces) {
 432                 DEBUG(3,("remote_op_init_server: no interfaces configured\n"));
 433                 return NT_STATUS_OK;
 434         }
 435
 436         for (i=0;ifaces[i];i++) {
 437                 NTSTATUS ret;
 438                 struct dcesrv_interface iface;
 439
 440                 if (!ep_server->interface_by_name(&iface, ifaces[i])) {
 441                         DEBUG(0,("remote_op_init_server: failed to find interface = '%s'\n", ifaces[i]));
 442                         talloc_free(ifaces);
 443                         return NT_STATUS_UNSUCCESSFUL;
 444                 }
 445
 446                 ret = remote_register_one_iface(dce_ctx, &iface);
 447                 if (!NT_STATUS_IS_OK(ret)) {
 448                         DEBUG(0,("remote_op_init_server: failed to register interface = '%s'\n", ifaces[i]));
 449                         talloc_free(ifaces);
 450                         return ret;
 451                 }
 452         }
 453
 454         talloc_free(ifaces);
 455         return NT_STATUS_OK;
 456 }
 457
 458 static bool remote_fill_interface(struct dcesrv_interface *iface, const struct ndr_interface_table *if_tabl)
 459 {
 460         iface->name = if_tabl->name;
 461         iface->syntax_id = if_tabl->syntax_id;
 462
 463         iface->bind = remote_op_bind;
 464         iface->unbind = NULL;
 465
 466         iface->ndr_pull = remote_op_ndr_pull;
 467         iface->dispatch = remote_op_dispatch;
 468         iface->reply = remote_op_reply;
 469         iface->ndr_push = remote_op_ndr_push;
 470
 471         iface->private_data = if_tabl;
 472         iface->flags = 0;
 473
 474         return true;
 475 }
 476
 477 static bool remote_op_interface_by_uuid(struct dcesrv_interface *iface, const struct GUID *uuid, uint32_t if_version)
 478 {
 479         const struct ndr_interface_list *l;
 480
 481         for (l=ndr_table_list();l;l=l->next) {
 482                 if (l->table->syntax_id.if_version == if_version &&
 483                         GUID_equal(&l->table->syntax_id.uuid, uuid)==0) {
 484                         return remote_fill_interface(iface, l->table);
 485                 }
 486         }
 487
 488         return false;
 489 }
 490
 491 static bool remote_op_interface_by_name(struct dcesrv_interface *iface, const char *name)
 492 {
 493         const struct ndr_interface_table *tbl = ndr_table_by_name(name);
 494
 495         if (tbl)
 496                 return remote_fill_interface(iface, tbl);
 497
 498         return false;
 499 }
 500
 501 NTSTATUS dcerpc_server_remote_init(TALLOC_CTX *ctx)
 502 {
 503         NTSTATUS ret;
 504         static const struct dcesrv_endpoint_server ep_server = {
 505                 /* fill in our name */
 506                 .name = "remote",
 507
 508                 /* fill in all the operations */
 509                 .init_server = remote_op_init_server,
 510
 511                 .interface_by_uuid = remote_op_interface_by_uuid,
 512                 .interface_by_name = remote_op_interface_by_name
 513         };
 514
 515         /* register ourselves with the DCERPC subsystem. */
 516         ret = dcerpc_register_ep_server(&ep_server);
 517         if (!NT_STATUS_IS_OK(ret)) {
 518                 DEBUG(0,("Failed to register 'remote' endpoint server!\n"));
 519                 return ret;
 520         }
 521
 522         /* We need the full DCE/RPC interface table */
 523         ndr_table_init();
 524
 525         return ret;
 526 }