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