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