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_uuid(&iface->syntax_id.uuid); /* FIXME: What about if_version ? */
  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         DEBUG(3, ("Using binding %s\n", dcerpc_binding_string(dce_call->context, b)));
 120
 121         /* If we already have a remote association group ID, then use that */
 122         if (dce_call->context->assoc_group->proxied_id != 0) {
 123                 b->assoc_group_id = dce_call->context->assoc_group->proxied_id;
 124         }
 125
 126         b->object.if_version = if_version;
 127
 128         pipe_conn_req = dcerpc_pipe_connect_b_send(dce_call->context, b, table,
 129                                                    credentials, dce_call->event_ctx, dce_call->conn->dce_ctx->lp_ctx);
 130         status = dcerpc_pipe_connect_b_recv(pipe_conn_req, dce_call->context, &(priv->c_pipe));
 131
 132         if (must_free_credentials) {
 133                 talloc_free(credentials);
 134         }
 135
 136         if (!NT_STATUS_IS_OK(status)) {
 137                 return status;
 138         }
 139
 140         if (dce_call->context->assoc_group->proxied_id == 0) {
 141                 dce_call->context->assoc_group->proxied_id = priv->c_pipe->assoc_group_id;
 142         }
 143
 144         if (!NT_STATUS_IS_OK(status)) {
 145                 return status;
 146         }
 147
 148         return NT_STATUS_OK;
 149 }
 150
 151 static NTSTATUS remote_op_ndr_pull(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_pull *pull, void **r)
 152 {
 153         enum ndr_err_code ndr_err;
 154         const struct ndr_interface_table *table = (const struct ndr_interface_table *)dce_call->context->iface->private_data;
 155         uint16_t opnum = dce_call->pkt.u.request.opnum;
 156
 157         dce_call->fault_code = 0;
 158
 159         if (opnum >= table->num_calls) {
 160                 dce_call->fault_code = DCERPC_FAULT_OP_RNG_ERROR;
 161                 return NT_STATUS_NET_WRITE_FAULT;
 162         }
 163
 164         *r = talloc_size(mem_ctx, table->calls[opnum].struct_size);
 165         if (!*r) {
 166                 return NT_STATUS_NO_MEMORY;
 167         }
 168
 169         /* unravel the NDR for the packet */
 170         ndr_err = table->calls[opnum].ndr_pull(pull, NDR_IN, *r);
 171         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 172                 dcerpc_log_packet(dce_call->conn->packet_log_dir,
 173                                                   table, opnum, NDR_IN,
 174                                   &dce_call->pkt.u.request.stub_and_verifier);
 175                 dce_call->fault_code = DCERPC_FAULT_NDR;
 176                 return NT_STATUS_NET_WRITE_FAULT;
 177         }
 178
 179         return NT_STATUS_OK;
 180 }
 181
 182 static void remote_op_dispatch_done(struct tevent_req *subreq);
 183
 184 static NTSTATUS remote_op_dispatch(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
 185 {
 186         struct dcesrv_remote_private *priv = talloc_get_type_abort(dce_call->context->private_data,
 187                                                                    struct dcesrv_remote_private);
 188         uint16_t opnum = dce_call->pkt.u.request.opnum;
 189         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 190         const struct ndr_interface_call *call;
 191         const char *name;
 192         struct tevent_req *subreq;
 193
 194         name = table->calls[opnum].name;
 195         call = &table->calls[opnum];
 196
 197         if (priv->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_IN) {
 198                 ndr_print_function_debug(call->ndr_print, name, NDR_IN | NDR_SET_VALUES, r);
 199         }
 200
 201         priv->c_pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 202
 203         /* we didn't use the return code of this function as we only check the last_fault_code */
 204         subreq = dcerpc_binding_handle_call_send(dce_call, dce_call->event_ctx,
 205                                                  priv->c_pipe->binding_handle,
 206                                                  NULL, table,
 207                                                  opnum, mem_ctx, r);
 208         if (subreq == NULL) {
 209                 DEBUG(0,("dcesrv_remote: call[%s] dcerpc_binding_handle_call_send() failed!\n", name));
 210                 return NT_STATUS_NO_MEMORY;
 211         }
 212         tevent_req_set_callback(subreq, remote_op_dispatch_done, dce_call);
 213
 214         dce_call->state_flags |= DCESRV_CALL_STATE_FLAG_ASYNC;
 215         return NT_STATUS_OK;
 216 }
 217
 218 static void remote_op_dispatch_done(struct tevent_req *subreq)
 219 {
 220         struct dcesrv_call_state *dce_call = tevent_req_callback_data(subreq,
 221                                              struct dcesrv_call_state);
 222         struct dcesrv_remote_private *priv = talloc_get_type_abort(dce_call->context->private_data,
 223                                                                    struct dcesrv_remote_private);
 224         uint16_t opnum = dce_call->pkt.u.request.opnum;
 225         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 226         const struct ndr_interface_call *call;
 227         const char *name;
 228         NTSTATUS status;
 229
 230         name = table->calls[opnum].name;
 231         call = &table->calls[opnum];
 232
 233         /* we didn't use the return code of this function as we only check the last_fault_code */
 234         status = dcerpc_binding_handle_call_recv(subreq);
 235         TALLOC_FREE(subreq);
 236
 237         dce_call->fault_code = priv->c_pipe->last_fault_code;
 238         if (dce_call->fault_code != 0) {
 239                 DEBUG(0,("dcesrv_remote: call[%s] failed with: %s!\n",
 240                         name, dcerpc_errstr(dce_call, dce_call->fault_code)));
 241                 goto reply;
 242         }
 243
 244         if (NT_STATUS_IS_OK(status) &&
 245             (priv->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_OUT)) {
 246                 ndr_print_function_debug(call->ndr_print, name, NDR_OUT, dce_call->r);
 247         }
 248
 249 reply:
 250         status = dcesrv_reply(dce_call);
 251         if (!NT_STATUS_IS_OK(status)) {
 252                 DEBUG(0,("dcesrv_remote: call[%s]: dcesrv_reply() failed - %s\n",
 253                         name, nt_errstr(status)));
 254         }
 255 }
 256
 257 static NTSTATUS remote_op_ndr_push(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_push *push, const void *r)
 258 {
 259         enum ndr_err_code ndr_err;
 260         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 261         uint16_t opnum = dce_call->pkt.u.request.opnum;
 262
 263         /* unravel the NDR for the packet */
 264         ndr_err = table->calls[opnum].ndr_push(push, NDR_OUT, r);
 265         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 266                 dce_call->fault_code = DCERPC_FAULT_NDR;
 267                 return NT_STATUS_NET_WRITE_FAULT;
 268         }
 269
 270         return NT_STATUS_OK;
 271 }
 272
 273 static NTSTATUS remote_register_one_iface(struct dcesrv_context *dce_ctx, const struct dcesrv_interface *iface)
 274 {
 275         unsigned int i;
 276         const struct ndr_interface_table *table = iface->private_data;
 277
 278         for (i=0;i<table->endpoints->count;i++) {
 279                 NTSTATUS ret;
 280                 const char *name = table->endpoints->names[i];
 281
 282                 ret = dcesrv_interface_register(dce_ctx, name, iface, NULL);
 283                 if (!NT_STATUS_IS_OK(ret)) {
 284                         DEBUG(1,("remote_op_init_server: failed to register endpoint '%s'\n",name));
 285                         return ret;
 286                 }
 287         }
 288
 289         return NT_STATUS_OK;
 290 }
 291
 292 static NTSTATUS remote_op_init_server(struct dcesrv_context *dce_ctx, const struct dcesrv_endpoint_server *ep_server)
 293 {
 294         unsigned int i;
 295         const char **ifaces = (const char **)str_list_make(dce_ctx, lpcfg_parm_string(dce_ctx->lp_ctx, NULL, "dcerpc_remote", "interfaces"),NULL);
 296
 297         if (!ifaces) {
 298                 DEBUG(3,("remote_op_init_server: no interfaces configured\n"));
 299                 return NT_STATUS_OK;
 300         }
 301
 302         for (i=0;ifaces[i];i++) {
 303                 NTSTATUS ret;
 304                 struct dcesrv_interface iface;
 305
 306                 if (!ep_server->interface_by_name(&iface, ifaces[i])) {
 307                         DEBUG(0,("remote_op_init_server: failed to find interface = '%s'\n", ifaces[i]));
 308                         talloc_free(ifaces);
 309                         return NT_STATUS_UNSUCCESSFUL;
 310                 }
 311
 312                 ret = remote_register_one_iface(dce_ctx, &iface);
 313                 if (!NT_STATUS_IS_OK(ret)) {
 314                         DEBUG(0,("remote_op_init_server: failed to register interface = '%s'\n", ifaces[i]));
 315                         talloc_free(ifaces);
 316                         return ret;
 317                 }
 318         }
 319
 320         talloc_free(ifaces);
 321         return NT_STATUS_OK;
 322 }
 323
 324 static bool remote_fill_interface(struct dcesrv_interface *iface, const struct ndr_interface_table *if_tabl)
 325 {
 326         iface->name = if_tabl->name;
 327         iface->syntax_id = if_tabl->syntax_id;
 328
 329         iface->bind = remote_op_bind;
 330         iface->unbind = NULL;
 331
 332         iface->ndr_pull = remote_op_ndr_pull;
 333         iface->dispatch = remote_op_dispatch;
 334         iface->reply = remote_op_reply;
 335         iface->ndr_push = remote_op_ndr_push;
 336
 337         iface->private_data = if_tabl;
 338
 339         return true;
 340 }
 341
 342 static bool remote_op_interface_by_uuid(struct dcesrv_interface *iface, const struct GUID *uuid, uint32_t if_version)
 343 {
 344         const struct ndr_interface_list *l;
 345
 346         for (l=ndr_table_list();l;l=l->next) {
 347                 if (l->table->syntax_id.if_version == if_version &&
 348                         GUID_equal(&l->table->syntax_id.uuid, uuid)==0) {
 349                         return remote_fill_interface(iface, l->table);
 350                 }
 351         }
 352
 353         return false;
 354 }
 355
 356 static bool remote_op_interface_by_name(struct dcesrv_interface *iface, const char *name)
 357 {
 358         const struct ndr_interface_table *tbl = ndr_table_by_name(name);
 359
 360         if (tbl)
 361                 return remote_fill_interface(iface, tbl);
 362
 363         return false;
 364 }
 365
 366 NTSTATUS dcerpc_server_remote_init(void)
 367 {
 368         NTSTATUS ret;
 369         struct dcesrv_endpoint_server ep_server;
 370
 371         ZERO_STRUCT(ep_server);
 372
 373         /* fill in our name */
 374         ep_server.name = "remote";
 375
 376         /* fill in all the operations */
 377         ep_server.init_server = remote_op_init_server;
 378
 379         ep_server.interface_by_uuid = remote_op_interface_by_uuid;
 380         ep_server.interface_by_name = remote_op_interface_by_name;
 381
 382         /* register ourselves with the DCERPC subsystem. */
 383         ret = dcerpc_register_ep_server(&ep_server);
 384         if (!NT_STATUS_IS_OK(ret)) {
 385                 DEBUG(0,("Failed to register 'remote' endpoint server!\n"));
 386                 return ret;
 387         }
 388
 389         /* We need the full DCE/RPC interface table */
 390         ndr_table_init();
 391
 392         return ret;
 393 }