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 struct dcesrv_remote_private {
  34         struct dcerpc_pipe *c_pipe;
  35 };
  36
  37 static NTSTATUS remote_op_reply(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
  38 {
  39         return NT_STATUS_OK;
  40 }
  41
  42 static NTSTATUS remote_op_bind(struct dcesrv_call_state *dce_call, const struct dcesrv_interface *iface, uint32_t if_version)
  43 {
  44         NTSTATUS status;
  45         const struct ndr_interface_table *table =
  46                 (const struct ndr_interface_table *)dce_call->context->iface->private_data;
  47         struct dcesrv_remote_private *priv;
  48         const char *binding = NULL;
  49         const char *user, *pass, *domain;
  50         struct cli_credentials *credentials;
  51         bool must_free_credentials = false;
  52         bool machine_account;
  53         struct dcerpc_binding           *b;
  54         struct composite_context        *pipe_conn_req;
  55         uint32_t flags = 0;
  56
  57         machine_account = lpcfg_parm_bool(dce_call->conn->dce_ctx->lp_ctx, NULL, "dcerpc_remote", "use_machine_account", false);
  58
  59         priv = talloc(dce_call->conn, struct dcesrv_remote_private);
  60         if (!priv) {
  61                 return NT_STATUS_NO_MEMORY;
  62         }
  63
  64         priv->c_pipe = NULL;
  65         dce_call->context->private_data = priv;
  66
  67         binding = lpcfg_parm_string(dce_call->conn->dce_ctx->lp_ctx,
  68                                     NULL,
  69                                     "dcerpc_remote",
  70                                     "binding");
  71         if (binding == NULL) {
  72                 DEBUG(0,("You must specify a DCE/RPC binding string\n"));
  73                 return NT_STATUS_INVALID_PARAMETER;
  74         }
  75
  76         user = lpcfg_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dcerpc_remote", "user");
  77         pass = lpcfg_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dcerpc_remote", "password");
  78         domain = lpcfg_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dceprc_remote", "domain");
  79
  80         credentials = dcesrv_call_credentials(dce_call);
  81
  82         if (user && pass) {
  83                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using specified account\n"));
  84                 credentials = cli_credentials_init(priv);
  85                 if (!credentials) {
  86                         return NT_STATUS_NO_MEMORY;
  87                 }
  88                 must_free_credentials = true;
  89                 cli_credentials_set_conf(credentials, dce_call->conn->dce_ctx->lp_ctx);
  90                 cli_credentials_set_username(credentials, user, CRED_SPECIFIED);
  91                 if (domain) {
  92                         cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
  93                 }
  94                 cli_credentials_set_password(credentials, pass, CRED_SPECIFIED);
  95         } else if (machine_account) {
  96                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using machine account\n"));
  97                 credentials = cli_credentials_init(priv);
  98                 if (!credentials) {
  99                         return NT_STATUS_NO_MEMORY;
 100                 }
 101                 must_free_credentials = true;
 102                 cli_credentials_set_conf(credentials, dce_call->conn->dce_ctx->lp_ctx);
 103                 if (domain) {
 104                         cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
 105                 }
 106                 status = cli_credentials_set_machine_account(credentials, dce_call->conn->dce_ctx->lp_ctx);
 107                 if (!NT_STATUS_IS_OK(status)) {
 108                         return status;
 109                 }
 110         } else if (credentials != NULL) {
 111                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using delegated credentials\n"));
 112         } else {
 113                 DEBUG(1,("dcerpc_remote: RPC Proxy: You must supply binding, user and password or have delegated credentials\n"));
 114                 return NT_STATUS_INVALID_PARAMETER;
 115         }
 116
 117         /* parse binding string to the structure */
 118         status = dcerpc_parse_binding(dce_call->context, binding, &b);
 119         if (!NT_STATUS_IS_OK(status)) {
 120                 DEBUG(0, ("Failed to parse dcerpc binding '%s'\n", binding));
 121                 return status;
 122         }
 123
 124         /* If we already have a remote association group ID, then use that */
 125         if (dce_call->conn->assoc_group->proxied_id != 0) {
 126                 status = dcerpc_binding_set_assoc_group_id(b,
 127                         dce_call->conn->assoc_group->proxied_id);
 128                 if (!NT_STATUS_IS_OK(status)) {
 129                         DEBUG(0, ("dcerpc_binding_set_assoc_group_id() - %s'\n",
 130                                   nt_errstr(status)));
 131                         return status;
 132                 }
 133         }
 134
 135         status = dcerpc_binding_set_abstract_syntax(b, &table->syntax_id);
 136         if (!NT_STATUS_IS_OK(status)) {
 137                 DEBUG(0, ("dcerpc_binding_set_abstract_syntax() - %s'\n",
 138                           nt_errstr(status)));
 139                 return status;
 140         }
 141
 142         if (dce_call->pkt.pfc_flags & DCERPC_PFC_FLAG_CONC_MPX) {
 143                 status = dcerpc_binding_set_flags(b, DCERPC_CONCURRENT_MULTIPLEX, 0);
 144                 if (!NT_STATUS_IS_OK(status)) {
 145                         DEBUG(0, ("dcerpc_binding_set_flags(CONC_MPX) - %s'\n",
 146                                   nt_errstr(status)));
 147                         return status;
 148                 }
 149         }
 150
 151         DEBUG(3, ("Using binding %s\n", dcerpc_binding_string(dce_call->context, b)));
 152
 153         pipe_conn_req = dcerpc_pipe_connect_b_send(dce_call->context, b, table,
 154                                                    credentials, dce_call->event_ctx, dce_call->conn->dce_ctx->lp_ctx);
 155         status = dcerpc_pipe_connect_b_recv(pipe_conn_req, dce_call->context, &(priv->c_pipe));
 156
 157         if (must_free_credentials) {
 158                 talloc_free(credentials);
 159         }
 160
 161         if (!NT_STATUS_IS_OK(status)) {
 162                 return status;
 163         }
 164
 165         flags = dcerpc_binding_get_flags(priv->c_pipe->binding);
 166         if (!(flags & DCERPC_CONCURRENT_MULTIPLEX)) {
 167                 dce_call->state_flags &= ~DCESRV_CALL_STATE_FLAG_MULTIPLEXED;
 168         }
 169
 170         if (dce_call->conn->assoc_group->proxied_id == 0) {
 171                 dce_call->conn->assoc_group->proxied_id =
 172                         dcerpc_binding_get_assoc_group_id(priv->c_pipe->binding);
 173         }
 174
 175         if (!NT_STATUS_IS_OK(status)) {
 176                 return status;
 177         }
 178
 179         return NT_STATUS_OK;
 180 }
 181
 182 static NTSTATUS remote_get_private(struct dcesrv_call_state *dce_call,
 183                                    struct dcesrv_remote_private **_priv)
 184 {
 185         void *ptr = NULL;
 186         struct dcesrv_remote_private *priv = NULL;
 187
 188         ptr = dce_call->context->private_data;
 189         priv = talloc_get_type_abort(ptr, struct dcesrv_remote_private);
 190
 191         *_priv = priv;
 192         return NT_STATUS_OK;
 193 }
 194
 195 static NTSTATUS remote_op_ndr_pull(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_pull *pull, void **r)
 196 {
 197         enum ndr_err_code ndr_err;
 198         const struct ndr_interface_table *table = (const struct ndr_interface_table *)dce_call->context->iface->private_data;
 199         uint16_t opnum = dce_call->pkt.u.request.opnum;
 200
 201         dce_call->fault_code = 0;
 202
 203         if (opnum >= table->num_calls) {
 204                 dce_call->fault_code = DCERPC_FAULT_OP_RNG_ERROR;
 205                 return NT_STATUS_NET_WRITE_FAULT;
 206         }
 207
 208         /*
 209          * We don't have support for calls with pipes.
 210          */
 211         if (table->calls[opnum].in_pipes.num_pipes != 0) {
 212                 dce_call->fault_code = DCERPC_FAULT_OP_RNG_ERROR;
 213                 return NT_STATUS_NET_WRITE_FAULT;
 214         }
 215         if (table->calls[opnum].out_pipes.num_pipes != 0) {
 216                 dce_call->fault_code = DCERPC_FAULT_OP_RNG_ERROR;
 217                 return NT_STATUS_NET_WRITE_FAULT;
 218         }
 219
 220         *r = talloc_size(mem_ctx, table->calls[opnum].struct_size);
 221         if (!*r) {
 222                 return NT_STATUS_NO_MEMORY;
 223         }
 224
 225         /* unravel the NDR for the packet */
 226         ndr_err = table->calls[opnum].ndr_pull(pull, NDR_IN, *r);
 227         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 228                 dcerpc_log_packet(dce_call->conn->packet_log_dir,
 229                                                   table, opnum, NDR_IN,
 230                                   &dce_call->pkt.u.request.stub_and_verifier);
 231                 dce_call->fault_code = DCERPC_FAULT_NDR;
 232                 return NT_STATUS_NET_WRITE_FAULT;
 233         }
 234
 235         return NT_STATUS_OK;
 236 }
 237
 238 static void remote_op_dispatch_done(struct tevent_req *subreq);
 239
 240 static NTSTATUS remote_op_dispatch(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
 241 {
 242         struct dcesrv_remote_private *priv = NULL;
 243         uint16_t opnum = dce_call->pkt.u.request.opnum;
 244         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 245         const struct ndr_interface_call *call;
 246         const char *name;
 247         struct tevent_req *subreq;
 248         NTSTATUS status;
 249
 250         status = remote_get_private(dce_call, &priv);
 251         if (!NT_STATUS_IS_OK(status)) {
 252                 return status;
 253         }
 254
 255         name = table->calls[opnum].name;
 256         call = &table->calls[opnum];
 257
 258         if (priv->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_IN) {
 259                 ndr_print_function_debug(call->ndr_print, name, NDR_IN | NDR_SET_VALUES, r);
 260         }
 261
 262         priv->c_pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 263
 264         /* we didn't use the return code of this function as we only check the last_fault_code */
 265         subreq = dcerpc_binding_handle_call_send(dce_call, dce_call->event_ctx,
 266                                                  priv->c_pipe->binding_handle,
 267                                                  NULL, table,
 268                                                  opnum, mem_ctx, r);
 269         if (subreq == NULL) {
 270                 DEBUG(0,("dcesrv_remote: call[%s] dcerpc_binding_handle_call_send() failed!\n", name));
 271                 return NT_STATUS_NO_MEMORY;
 272         }
 273         tevent_req_set_callback(subreq, remote_op_dispatch_done, dce_call);
 274
 275         dce_call->state_flags |= DCESRV_CALL_STATE_FLAG_ASYNC;
 276         return NT_STATUS_OK;
 277 }
 278
 279 static void remote_op_dispatch_done(struct tevent_req *subreq)
 280 {
 281         struct dcesrv_call_state *dce_call = tevent_req_callback_data(subreq,
 282                                              struct dcesrv_call_state);
 283         struct dcesrv_remote_private *priv = talloc_get_type_abort(dce_call->context->private_data,
 284                                                                    struct dcesrv_remote_private);
 285         uint16_t opnum = dce_call->pkt.u.request.opnum;
 286         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 287         const struct ndr_interface_call *call;
 288         const char *name;
 289         NTSTATUS status;
 290
 291         name = table->calls[opnum].name;
 292         call = &table->calls[opnum];
 293
 294         /* we didn't use the return code of this function as we only check the last_fault_code */
 295         status = dcerpc_binding_handle_call_recv(subreq);
 296         TALLOC_FREE(subreq);
 297
 298         dce_call->fault_code = priv->c_pipe->last_fault_code;
 299         if (dce_call->fault_code != 0) {
 300                 DEBUG(0,("dcesrv_remote: call[%s] failed with: %s!\n",
 301                         name, dcerpc_errstr(dce_call, dce_call->fault_code)));
 302                 goto reply;
 303         }
 304
 305         if (NT_STATUS_IS_OK(status) &&
 306             (priv->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_OUT)) {
 307                 ndr_print_function_debug(call->ndr_print, name, NDR_OUT, dce_call->r);
 308         }
 309
 310 reply:
 311         status = dcesrv_reply(dce_call);
 312         if (!NT_STATUS_IS_OK(status)) {
 313                 DEBUG(0,("dcesrv_remote: call[%s]: dcesrv_reply() failed - %s\n",
 314                         name, nt_errstr(status)));
 315         }
 316 }
 317
 318 static NTSTATUS remote_op_ndr_push(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_push *push, const void *r)
 319 {
 320         enum ndr_err_code ndr_err;
 321         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 322         uint16_t opnum = dce_call->pkt.u.request.opnum;
 323
 324         /* unravel the NDR for the packet */
 325         ndr_err = table->calls[opnum].ndr_push(push, NDR_OUT, r);
 326         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 327                 dce_call->fault_code = DCERPC_FAULT_NDR;
 328                 return NT_STATUS_NET_WRITE_FAULT;
 329         }
 330
 331         return NT_STATUS_OK;
 332 }
 333
 334 static NTSTATUS remote_register_one_iface(struct dcesrv_context *dce_ctx, const struct dcesrv_interface *iface)
 335 {
 336         unsigned int i;
 337         const struct ndr_interface_table *table = iface->private_data;
 338
 339         for (i=0;i<table->endpoints->count;i++) {
 340                 NTSTATUS ret;
 341                 const char *name = table->endpoints->names[i];
 342
 343                 ret = dcesrv_interface_register(dce_ctx, name, iface, NULL);
 344                 if (!NT_STATUS_IS_OK(ret)) {
 345                         DEBUG(1,("remote_op_init_server: failed to register endpoint '%s'\n",name));
 346                         return ret;
 347                 }
 348         }
 349
 350         return NT_STATUS_OK;
 351 }
 352
 353 static NTSTATUS remote_op_init_server(struct dcesrv_context *dce_ctx, const struct dcesrv_endpoint_server *ep_server)
 354 {
 355         unsigned int i;
 356         char **ifaces = str_list_make(dce_ctx, lpcfg_parm_string(dce_ctx->lp_ctx, NULL, "dcerpc_remote", "interfaces"),NULL);
 357
 358         if (!ifaces) {
 359                 DEBUG(3,("remote_op_init_server: no interfaces configured\n"));
 360                 return NT_STATUS_OK;
 361         }
 362
 363         for (i=0;ifaces[i];i++) {
 364                 NTSTATUS ret;
 365                 struct dcesrv_interface iface;
 366
 367                 if (!ep_server->interface_by_name(&iface, ifaces[i])) {
 368                         DEBUG(0,("remote_op_init_server: failed to find interface = '%s'\n", ifaces[i]));
 369                         talloc_free(ifaces);
 370                         return NT_STATUS_UNSUCCESSFUL;
 371                 }
 372
 373                 ret = remote_register_one_iface(dce_ctx, &iface);
 374                 if (!NT_STATUS_IS_OK(ret)) {
 375                         DEBUG(0,("remote_op_init_server: failed to register interface = '%s'\n", ifaces[i]));
 376                         talloc_free(ifaces);
 377                         return ret;
 378                 }
 379         }
 380
 381         talloc_free(ifaces);
 382         return NT_STATUS_OK;
 383 }
 384
 385 static bool remote_fill_interface(struct dcesrv_interface *iface, const struct ndr_interface_table *if_tabl)
 386 {
 387         iface->name = if_tabl->name;
 388         iface->syntax_id = if_tabl->syntax_id;
 389
 390         iface->bind = remote_op_bind;
 391         iface->unbind = NULL;
 392
 393         iface->ndr_pull = remote_op_ndr_pull;
 394         iface->dispatch = remote_op_dispatch;
 395         iface->reply = remote_op_reply;
 396         iface->ndr_push = remote_op_ndr_push;
 397
 398         iface->private_data = if_tabl;
 399         iface->flags = 0;
 400
 401         return true;
 402 }
 403
 404 static bool remote_op_interface_by_uuid(struct dcesrv_interface *iface, const struct GUID *uuid, uint32_t if_version)
 405 {
 406         const struct ndr_interface_list *l;
 407
 408         for (l=ndr_table_list();l;l=l->next) {
 409                 if (l->table->syntax_id.if_version == if_version &&
 410                         GUID_equal(&l->table->syntax_id.uuid, uuid)==0) {
 411                         return remote_fill_interface(iface, l->table);
 412                 }
 413         }
 414
 415         return false;
 416 }
 417
 418 static bool remote_op_interface_by_name(struct dcesrv_interface *iface, const char *name)
 419 {
 420         const struct ndr_interface_table *tbl = ndr_table_by_name(name);
 421
 422         if (tbl)
 423                 return remote_fill_interface(iface, tbl);
 424
 425         return false;
 426 }
 427
 428 NTSTATUS dcerpc_server_remote_init(TALLOC_CTX *ctx)
 429 {
 430         NTSTATUS ret;
 431         static const struct dcesrv_endpoint_server ep_server = {
 432                 /* fill in our name */
 433                 .name = "remote",
 434
 435                 /* fill in all the operations */
 436                 .init_server = remote_op_init_server,
 437
 438                 .interface_by_uuid = remote_op_interface_by_uuid,
 439                 .interface_by_name = remote_op_interface_by_name
 440         };
 441
 442         /* register ourselves with the DCERPC subsystem. */
 443         ret = dcerpc_register_ep_server(&ep_server);
 444         if (!NT_STATUS_IS_OK(ret)) {
 445                 DEBUG(0,("Failed to register 'remote' endpoint server!\n"));
 446                 return ret;
 447         }
 448
 449         /* We need the full DCE/RPC interface table */
 450         ndr_table_init();
 451
 452         return ret;
 453 }