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