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         bool allow_anonymous;
  54         struct dcerpc_binding           *b;
  55         struct composite_context        *pipe_conn_req;
  56         uint32_t flags = 0;
  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         binding = lpcfg_parm_string(dce_call->conn->dce_ctx->lp_ctx,
  67                                     NULL,
  68                                     "dcerpc_remote",
  69                                     "binding");
  70         if (binding == NULL) {
  71                 DEBUG(0,("You must specify a DCE/RPC binding string\n"));
  72                 return NT_STATUS_INVALID_PARAMETER;
  73         }
  74
  75         user = lpcfg_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dcerpc_remote", "user");
  76         pass = lpcfg_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dcerpc_remote", "password");
  77         domain = lpcfg_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dceprc_remote", "domain");
  78
  79         machine_account = lpcfg_parm_bool(dce_call->conn->dce_ctx->lp_ctx,
  80                                           NULL,
  81                                           "dcerpc_remote",
  82                                           "use_machine_account",
  83                                           false);
  84         allow_anonymous = lpcfg_parm_bool(dce_call->conn->dce_ctx->lp_ctx,
  85                                           NULL,
  86                                           "dcerpc_remote",
  87                                           "allow_anonymous_fallback",
  88                                           false);
  89
  90         credentials = dcesrv_call_credentials(dce_call);
  91
  92         if (user && pass) {
  93                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using specified account\n"));
  94                 credentials = cli_credentials_init(priv);
  95                 if (!credentials) {
  96                         return NT_STATUS_NO_MEMORY;
  97                 }
  98                 must_free_credentials = true;
  99                 cli_credentials_set_conf(credentials, dce_call->conn->dce_ctx->lp_ctx);
 100                 cli_credentials_set_username(credentials, user, CRED_SPECIFIED);
 101                 if (domain) {
 102                         cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
 103                 }
 104                 cli_credentials_set_password(credentials, pass, CRED_SPECIFIED);
 105         } else if (machine_account) {
 106                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using machine account\n"));
 107                 credentials = cli_credentials_init(priv);
 108                 if (!credentials) {
 109                         return NT_STATUS_NO_MEMORY;
 110                 }
 111                 must_free_credentials = true;
 112                 cli_credentials_set_conf(credentials, dce_call->conn->dce_ctx->lp_ctx);
 113                 if (domain) {
 114                         cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
 115                 }
 116                 status = cli_credentials_set_machine_account(credentials, dce_call->conn->dce_ctx->lp_ctx);
 117                 if (!NT_STATUS_IS_OK(status)) {
 118                         return status;
 119                 }
 120         } else if (credentials != NULL) {
 121                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using delegated credentials\n"));
 122         } else if (allow_anonymous) {
 123                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using anonymous\n"));
 124                 credentials = cli_credentials_init_anon(priv);
 125                 if (!credentials) {
 126                         return NT_STATUS_NO_MEMORY;
 127                 }
 128                 must_free_credentials = true;
 129         } else {
 130                 DEBUG(1,("dcerpc_remote: RPC Proxy: You must supply binding, user and password or have delegated credentials\n"));
 131                 return NT_STATUS_INVALID_PARAMETER;
 132         }
 133
 134         /* parse binding string to the structure */
 135         status = dcerpc_parse_binding(dce_call->context, binding, &b);
 136         if (!NT_STATUS_IS_OK(status)) {
 137                 DEBUG(0, ("Failed to parse dcerpc binding '%s'\n", binding));
 138                 return status;
 139         }
 140
 141         /* If we already have a remote association group ID, then use that */
 142         if (dce_call->conn->assoc_group->proxied_id != 0) {
 143                 status = dcerpc_binding_set_assoc_group_id(b,
 144                         dce_call->conn->assoc_group->proxied_id);
 145                 if (!NT_STATUS_IS_OK(status)) {
 146                         DEBUG(0, ("dcerpc_binding_set_assoc_group_id() - %s'\n",
 147                                   nt_errstr(status)));
 148                         return status;
 149                 }
 150         }
 151
 152         status = dcerpc_binding_set_abstract_syntax(b, &table->syntax_id);
 153         if (!NT_STATUS_IS_OK(status)) {
 154                 DEBUG(0, ("dcerpc_binding_set_abstract_syntax() - %s'\n",
 155                           nt_errstr(status)));
 156                 return status;
 157         }
 158
 159         if (dce_call->pkt.pfc_flags & DCERPC_PFC_FLAG_CONC_MPX) {
 160                 status = dcerpc_binding_set_flags(b, DCERPC_CONCURRENT_MULTIPLEX, 0);
 161                 if (!NT_STATUS_IS_OK(status)) {
 162                         DEBUG(0, ("dcerpc_binding_set_flags(CONC_MPX) - %s'\n",
 163                                   nt_errstr(status)));
 164                         return status;
 165                 }
 166         }
 167
 168         DEBUG(3, ("Using binding %s\n", dcerpc_binding_string(dce_call->context, b)));
 169
 170         pipe_conn_req = dcerpc_pipe_connect_b_send(dce_call->context, b, table,
 171                                                    credentials, dce_call->event_ctx, dce_call->conn->dce_ctx->lp_ctx);
 172         status = dcerpc_pipe_connect_b_recv(pipe_conn_req, dce_call->context, &(priv->c_pipe));
 173
 174         if (must_free_credentials) {
 175                 talloc_free(credentials);
 176         }
 177
 178         if (!NT_STATUS_IS_OK(status)) {
 179                 return status;
 180         }
 181
 182         if (dce_call->pkt.pfc_flags & DCERPC_PFC_FLAG_CONC_MPX) {
 183                 flags = dcerpc_binding_get_flags(priv->c_pipe->binding);
 184                 if (!(flags & DCERPC_CONCURRENT_MULTIPLEX)) {
 185                         DEBUG(1,("dcerpc_remote: RPC Proxy: "
 186                                  "Remote server doesn't support MPX\n"));
 187                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
 188                 }
 189         }
 190
 191         if (dce_call->conn->assoc_group->proxied_id == 0) {
 192                 dce_call->conn->assoc_group->proxied_id =
 193                         dcerpc_binding_get_assoc_group_id(priv->c_pipe->binding);
 194         }
 195
 196         if (!NT_STATUS_IS_OK(status)) {
 197                 return status;
 198         }
 199
 200         return NT_STATUS_OK;
 201 }
 202
 203 static NTSTATUS remote_get_private(struct dcesrv_call_state *dce_call,
 204                                    struct dcesrv_remote_private **_priv)
 205 {
 206         void *ptr = NULL;
 207         struct dcesrv_remote_private *priv = NULL;
 208
 209         ptr = dce_call->context->private_data;
 210         priv = talloc_get_type_abort(ptr, struct dcesrv_remote_private);
 211
 212         *_priv = priv;
 213         return NT_STATUS_OK;
 214 }
 215
 216 static NTSTATUS remote_op_ndr_pull(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_pull *pull, void **r)
 217 {
 218         enum ndr_err_code ndr_err;
 219         const struct ndr_interface_table *table = (const struct ndr_interface_table *)dce_call->context->iface->private_data;
 220         uint16_t opnum = dce_call->pkt.u.request.opnum;
 221
 222         dce_call->fault_code = 0;
 223
 224         if (opnum >= table->num_calls) {
 225                 dce_call->fault_code = DCERPC_FAULT_OP_RNG_ERROR;
 226                 return NT_STATUS_NET_WRITE_FAULT;
 227         }
 228
 229         /*
 230          * We don't have support for calls with pipes.
 231          */
 232         if (table->calls[opnum].in_pipes.num_pipes != 0) {
 233                 dce_call->fault_code = DCERPC_FAULT_OP_RNG_ERROR;
 234                 return NT_STATUS_NET_WRITE_FAULT;
 235         }
 236         if (table->calls[opnum].out_pipes.num_pipes != 0) {
 237                 dce_call->fault_code = DCERPC_FAULT_OP_RNG_ERROR;
 238                 return NT_STATUS_NET_WRITE_FAULT;
 239         }
 240
 241         *r = talloc_size(mem_ctx, table->calls[opnum].struct_size);
 242         if (!*r) {
 243                 return NT_STATUS_NO_MEMORY;
 244         }
 245
 246         /* unravel the NDR for the packet */
 247         ndr_err = table->calls[opnum].ndr_pull(pull, NDR_IN, *r);
 248         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 249                 dcerpc_log_packet(dce_call->conn->packet_log_dir,
 250                                                   table, opnum, NDR_IN,
 251                                   &dce_call->pkt.u.request.stub_and_verifier);
 252                 dce_call->fault_code = DCERPC_FAULT_NDR;
 253                 return NT_STATUS_NET_WRITE_FAULT;
 254         }
 255
 256         return NT_STATUS_OK;
 257 }
 258
 259 static void remote_op_dispatch_done(struct tevent_req *subreq);
 260
 261 static NTSTATUS remote_op_dispatch(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
 262 {
 263         struct dcesrv_remote_private *priv = NULL;
 264         uint16_t opnum = dce_call->pkt.u.request.opnum;
 265         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 266         const struct ndr_interface_call *call;
 267         const char *name;
 268         struct tevent_req *subreq;
 269         NTSTATUS status;
 270
 271         status = remote_get_private(dce_call, &priv);
 272         if (!NT_STATUS_IS_OK(status)) {
 273                 return status;
 274         }
 275
 276         name = table->calls[opnum].name;
 277         call = &table->calls[opnum];
 278
 279         if (priv->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_IN) {
 280                 ndr_print_function_debug(call->ndr_print, name, NDR_IN | NDR_SET_VALUES, r);
 281         }
 282
 283         priv->c_pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 284
 285         /* we didn't use the return code of this function as we only check the last_fault_code */
 286         subreq = dcerpc_binding_handle_call_send(dce_call, dce_call->event_ctx,
 287                                                  priv->c_pipe->binding_handle,
 288                                                  NULL, table,
 289                                                  opnum, mem_ctx, r);
 290         if (subreq == NULL) {
 291                 DEBUG(0,("dcesrv_remote: call[%s] dcerpc_binding_handle_call_send() failed!\n", name));
 292                 return NT_STATUS_NO_MEMORY;
 293         }
 294         tevent_req_set_callback(subreq, remote_op_dispatch_done, dce_call);
 295
 296         dce_call->state_flags |= DCESRV_CALL_STATE_FLAG_ASYNC;
 297         return NT_STATUS_OK;
 298 }
 299
 300 static void remote_op_dispatch_done(struct tevent_req *subreq)
 301 {
 302         struct dcesrv_call_state *dce_call = tevent_req_callback_data(subreq,
 303                                              struct dcesrv_call_state);
 304         struct dcesrv_remote_private *priv = talloc_get_type_abort(dce_call->context->private_data,
 305                                                                    struct dcesrv_remote_private);
 306         uint16_t opnum = dce_call->pkt.u.request.opnum;
 307         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 308         const struct ndr_interface_call *call;
 309         const char *name;
 310         NTSTATUS status;
 311
 312         name = table->calls[opnum].name;
 313         call = &table->calls[opnum];
 314
 315         /* we didn't use the return code of this function as we only check the last_fault_code */
 316         status = dcerpc_binding_handle_call_recv(subreq);
 317         TALLOC_FREE(subreq);
 318
 319         dce_call->fault_code = priv->c_pipe->last_fault_code;
 320         if (dce_call->fault_code != 0) {
 321                 DEBUG(0,("dcesrv_remote: call[%s] failed with: %s!\n",
 322                         name, dcerpc_errstr(dce_call, dce_call->fault_code)));
 323                 goto reply;
 324         }
 325
 326         if (NT_STATUS_IS_OK(status) &&
 327             (priv->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_OUT)) {
 328                 ndr_print_function_debug(call->ndr_print, name, NDR_OUT, dce_call->r);
 329         }
 330
 331 reply:
 332         status = dcesrv_reply(dce_call);
 333         if (!NT_STATUS_IS_OK(status)) {
 334                 DEBUG(0,("dcesrv_remote: call[%s]: dcesrv_reply() failed - %s\n",
 335                         name, nt_errstr(status)));
 336         }
 337 }
 338
 339 static NTSTATUS remote_op_ndr_push(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_push *push, const void *r)
 340 {
 341         enum ndr_err_code ndr_err;
 342         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 343         uint16_t opnum = dce_call->pkt.u.request.opnum;
 344
 345         /* unravel the NDR for the packet */
 346         ndr_err = table->calls[opnum].ndr_push(push, NDR_OUT, r);
 347         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 348                 dce_call->fault_code = DCERPC_FAULT_NDR;
 349                 return NT_STATUS_NET_WRITE_FAULT;
 350         }
 351
 352         return NT_STATUS_OK;
 353 }
 354
 355 static NTSTATUS remote_register_one_iface(struct dcesrv_context *dce_ctx, const struct dcesrv_interface *iface)
 356 {
 357         unsigned int i;
 358         const struct ndr_interface_table *table = iface->private_data;
 359
 360         for (i=0;i<table->endpoints->count;i++) {
 361                 NTSTATUS ret;
 362                 const char *name = table->endpoints->names[i];
 363
 364                 ret = dcesrv_interface_register(dce_ctx, name, iface, NULL);
 365                 if (!NT_STATUS_IS_OK(ret)) {
 366                         DEBUG(1,("remote_op_init_server: failed to register endpoint '%s'\n",name));
 367                         return ret;
 368                 }
 369         }
 370
 371         return NT_STATUS_OK;
 372 }
 373
 374 static NTSTATUS remote_op_init_server(struct dcesrv_context *dce_ctx, const struct dcesrv_endpoint_server *ep_server)
 375 {
 376         unsigned int i;
 377         char **ifaces = str_list_make(dce_ctx, lpcfg_parm_string(dce_ctx->lp_ctx, NULL, "dcerpc_remote", "interfaces"),NULL);
 378
 379         if (!ifaces) {
 380                 DEBUG(3,("remote_op_init_server: no interfaces configured\n"));
 381                 return NT_STATUS_OK;
 382         }
 383
 384         for (i=0;ifaces[i];i++) {
 385                 NTSTATUS ret;
 386                 struct dcesrv_interface iface;
 387
 388                 if (!ep_server->interface_by_name(&iface, ifaces[i])) {
 389                         DEBUG(0,("remote_op_init_server: failed to find interface = '%s'\n", ifaces[i]));
 390                         talloc_free(ifaces);
 391                         return NT_STATUS_UNSUCCESSFUL;
 392                 }
 393
 394                 ret = remote_register_one_iface(dce_ctx, &iface);
 395                 if (!NT_STATUS_IS_OK(ret)) {
 396                         DEBUG(0,("remote_op_init_server: failed to register interface = '%s'\n", ifaces[i]));
 397                         talloc_free(ifaces);
 398                         return ret;
 399                 }
 400         }
 401
 402         talloc_free(ifaces);
 403         return NT_STATUS_OK;
 404 }
 405
 406 static bool remote_fill_interface(struct dcesrv_interface *iface, const struct ndr_interface_table *if_tabl)
 407 {
 408         iface->name = if_tabl->name;
 409         iface->syntax_id = if_tabl->syntax_id;
 410
 411         iface->bind = remote_op_bind;
 412         iface->unbind = NULL;
 413
 414         iface->ndr_pull = remote_op_ndr_pull;
 415         iface->dispatch = remote_op_dispatch;
 416         iface->reply = remote_op_reply;
 417         iface->ndr_push = remote_op_ndr_push;
 418
 419         iface->private_data = if_tabl;
 420         iface->flags = 0;
 421
 422         return true;
 423 }
 424
 425 static bool remote_op_interface_by_uuid(struct dcesrv_interface *iface, const struct GUID *uuid, uint32_t if_version)
 426 {
 427         const struct ndr_interface_list *l;
 428
 429         for (l=ndr_table_list();l;l=l->next) {
 430                 if (l->table->syntax_id.if_version == if_version &&
 431                         GUID_equal(&l->table->syntax_id.uuid, uuid)==0) {
 432                         return remote_fill_interface(iface, l->table);
 433                 }
 434         }
 435
 436         return false;
 437 }
 438
 439 static bool remote_op_interface_by_name(struct dcesrv_interface *iface, const char *name)
 440 {
 441         const struct ndr_interface_table *tbl = ndr_table_by_name(name);
 442
 443         if (tbl)
 444                 return remote_fill_interface(iface, tbl);
 445
 446         return false;
 447 }
 448
 449 NTSTATUS dcerpc_server_remote_init(TALLOC_CTX *ctx)
 450 {
 451         NTSTATUS ret;
 452         static const struct dcesrv_endpoint_server ep_server = {
 453                 /* fill in our name */
 454                 .name = "remote",
 455
 456                 /* fill in all the operations */
 457                 .init_server = remote_op_init_server,
 458
 459                 .interface_by_uuid = remote_op_interface_by_uuid,
 460                 .interface_by_name = remote_op_interface_by_name
 461         };
 462
 463         /* register ourselves with the DCERPC subsystem. */
 464         ret = dcerpc_register_ep_server(&ep_server);
 465         if (!NT_STATUS_IS_OK(ret)) {
 466                 DEBUG(0,("Failed to register 'remote' endpoint server!\n"));
 467                 return ret;
 468         }
 469
 470         /* We need the full DCE/RPC interface table */
 471         ndr_table_init();
 472
 473         return ret;
 474 }