source/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
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "rpc_server/dcerpc_server.h"
  23 #include "auth/auth.h"
  24 #include "auth/credentials/credentials.h"
  25 #include "librpc/ndr/ndr_table.h"
  26
  27
  28 struct dcesrv_remote_private {
  29         struct dcerpc_pipe *c_pipe;
  30 };
  31
  32 static NTSTATUS remote_op_reply(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
  33 {
  34         return NT_STATUS_OK;
  35 }
  36
  37 static NTSTATUS remote_op_bind(struct dcesrv_call_state *dce_call, const struct dcesrv_interface *iface)
  38 {
  39         NTSTATUS status;
  40         const struct ndr_interface_table *table;
  41         struct dcesrv_remote_private *private;
  42         const char *binding = lp_parm_string(-1, "dcerpc_remote", "binding");
  43         const char *user, *pass, *domain;
  44         struct cli_credentials *credentials;
  45         BOOL machine_account;
  46
  47         machine_account = lp_parm_bool(-1, "dcerpc_remote", "use_machine_account", False);
  48
  49         private = talloc(dce_call->conn, struct dcesrv_remote_private);
  50         if (!private) {
  51                 return NT_STATUS_NO_MEMORY;
  52         }
  53
  54         private->c_pipe = NULL;
  55         dce_call->context->private = private;
  56
  57         if (!binding) {
  58                 DEBUG(0,("You must specify a DCE/RPC binding string\n"));
  59                 return NT_STATUS_INVALID_PARAMETER;
  60         }
  61
  62         user = lp_parm_string(-1, "dcerpc_remote", "user");
  63         pass = lp_parm_string(-1, "dcerpc_remote", "password");
  64         domain = lp_parm_string(-1, "dceprc_remote", "domain");
  65
  66         table = ndr_table_by_uuid(&iface->syntax_id.uuid); /* FIXME: What about if_version ? */
  67         if (!table) {
  68                 dce_call->fault_code = DCERPC_FAULT_UNK_IF;
  69                 return NT_STATUS_NET_WRITE_FAULT;
  70         }
  71
  72         if (user && pass) {
  73                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using specified account\n"));
  74                 credentials = cli_credentials_init(private);
  75                 if (!credentials) {
  76                         return NT_STATUS_NO_MEMORY;
  77                 }
  78                 cli_credentials_set_conf(credentials);
  79                 cli_credentials_set_username(credentials, user, CRED_SPECIFIED);
  80                 if (domain) {
  81                         cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
  82                 }
  83                 cli_credentials_set_password(credentials, pass, CRED_SPECIFIED);
  84         } else if (machine_account) {
  85                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using machine account\n"));
  86                 credentials = cli_credentials_init(private);
  87                 cli_credentials_set_conf(credentials);
  88                 if (domain) {
  89                         cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
  90                 }
  91                 status = cli_credentials_set_machine_account(credentials);
  92                 if (!NT_STATUS_IS_OK(status)) {
  93                         return status;
  94                 }
  95         } else if (dce_call->conn->auth_state.session_info->credentials) {
  96                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using delegated credentials\n"));
  97                 credentials = dce_call->conn->auth_state.session_info->credentials;
  98         } else {
  99                 DEBUG(1,("dcerpc_remote: RPC Proxy: You must supply binding, user and password or have delegated credentials\n"));
 100                 return NT_STATUS_INVALID_PARAMETER;
 101         }
 102
 103         status = dcerpc_pipe_connect(private,
 104                                      &(private->c_pipe), binding, table,
 105                                      credentials, dce_call->event_ctx);
 106
 107         talloc_free(credentials);
 108         if (!NT_STATUS_IS_OK(status)) {
 109                 return status;
 110         }
 111
 112         return NT_STATUS_OK;
 113 }
 114
 115 static void remote_op_unbind(struct dcesrv_connection_context *context, const struct dcesrv_interface *iface)
 116 {
 117         struct dcesrv_remote_private *private = context->private;
 118
 119         talloc_free(private->c_pipe);
 120
 121         return;
 122 }
 123
 124 static NTSTATUS remote_op_ndr_pull(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_pull *pull, void **r)
 125 {
 126         NTSTATUS status;
 127         const struct ndr_interface_table *table = dce_call->context->iface->private;
 128         uint16_t opnum = dce_call->pkt.u.request.opnum;
 129
 130         dce_call->fault_code = 0;
 131
 132         if (opnum >= table->num_calls) {
 133                 dce_call->fault_code = DCERPC_FAULT_OP_RNG_ERROR;
 134                 return NT_STATUS_NET_WRITE_FAULT;
 135         }
 136
 137         *r = talloc_size(mem_ctx, table->calls[opnum].struct_size);
 138         if (!*r) {
 139                 return NT_STATUS_NO_MEMORY;
 140         }
 141
 142         /* unravel the NDR for the packet */
 143         status = table->calls[opnum].ndr_pull(pull, NDR_IN, *r);
 144         if (!NT_STATUS_IS_OK(status)) {
 145                 dcerpc_log_packet(table, opnum, NDR_IN,
 146                                   &dce_call->pkt.u.request.stub_and_verifier);
 147                 dce_call->fault_code = DCERPC_FAULT_NDR;
 148                 return NT_STATUS_NET_WRITE_FAULT;
 149         }
 150
 151         return NT_STATUS_OK;
 152 }
 153
 154 static NTSTATUS remote_op_dispatch(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
 155 {
 156         struct dcesrv_remote_private *private = dce_call->context->private;
 157         uint16_t opnum = dce_call->pkt.u.request.opnum;
 158         const struct ndr_interface_table *table = dce_call->context->iface->private;
 159         const struct ndr_interface_call *call;
 160         const char *name;
 161
 162         name = table->calls[opnum].name;
 163         call = &table->calls[opnum];
 164
 165         if (private->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_IN) {
 166                 ndr_print_function_debug(call->ndr_print, name, NDR_IN | NDR_SET_VALUES, r);
 167         }
 168
 169         private->c_pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 170
 171         /* we didn't use the return code of this function as we only check the last_fault_code */
 172         dcerpc_ndr_request(private->c_pipe, NULL, table, opnum, mem_ctx,r);
 173
 174         dce_call->fault_code = private->c_pipe->last_fault_code;
 175         if (dce_call->fault_code != 0) {
 176                 DEBUG(0,("dcesrv_remote: call[%s] failed with: %s!\n",name, dcerpc_errstr(mem_ctx, dce_call->fault_code)));
 177                 return NT_STATUS_NET_WRITE_FAULT;
 178         }
 179
 180         if ((dce_call->fault_code == 0) &&
 181             (private->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_OUT)) {
 182                 ndr_print_function_debug(call->ndr_print, name, NDR_OUT, r);
 183         }
 184
 185         return NT_STATUS_OK;
 186 }
 187
 188 static NTSTATUS remote_op_ndr_push(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_push *push, const void *r)
 189 {
 190         NTSTATUS status;
 191         const struct ndr_interface_table *table = dce_call->context->iface->private;
 192         uint16_t opnum = dce_call->pkt.u.request.opnum;
 193
 194         /* unravel the NDR for the packet */
 195         status = table->calls[opnum].ndr_push(push, NDR_OUT, r);
 196         if (!NT_STATUS_IS_OK(status)) {
 197                 dce_call->fault_code = DCERPC_FAULT_NDR;
 198                 return NT_STATUS_NET_WRITE_FAULT;
 199         }
 200
 201         return NT_STATUS_OK;
 202 }
 203
 204 static NTSTATUS remote_register_one_iface(struct dcesrv_context *dce_ctx, const struct dcesrv_interface *iface)
 205 {
 206         int i;
 207         const struct ndr_interface_table *table = iface->private;
 208
 209         for (i=0;i<table->endpoints->count;i++) {
 210                 NTSTATUS ret;
 211                 const char *name = table->endpoints->names[i];
 212
 213                 ret = dcesrv_interface_register(dce_ctx, name, iface, NULL);
 214                 if (!NT_STATUS_IS_OK(ret)) {
 215                         DEBUG(1,("remote_op_init_server: failed to register endpoint '%s'\n",name));
 216                         return ret;
 217                 }
 218         }
 219
 220         return NT_STATUS_OK;
 221 }
 222
 223 static NTSTATUS remote_op_init_server(struct dcesrv_context *dce_ctx, const struct dcesrv_endpoint_server *ep_server)
 224 {
 225         int i;
 226         const char **ifaces = str_list_make(dce_ctx, lp_parm_string(-1,"dcerpc_remote","interfaces"),NULL);
 227
 228         if (!ifaces) {
 229                 DEBUG(3,("remote_op_init_server: no interfaces configured\n"));
 230                 return NT_STATUS_OK;
 231         }
 232
 233         for (i=0;ifaces[i];i++) {
 234                 NTSTATUS ret;
 235                 struct dcesrv_interface iface;
 236
 237                 if (!ep_server->interface_by_name(&iface, ifaces[i])) {
 238                         DEBUG(0,("remote_op_init_server: failed to find interface = '%s'\n", ifaces[i]));
 239                         talloc_free(ifaces);
 240                         return NT_STATUS_UNSUCCESSFUL;
 241                 }
 242
 243                 ret = remote_register_one_iface(dce_ctx, &iface);
 244                 if (!NT_STATUS_IS_OK(ret)) {
 245                         DEBUG(0,("remote_op_init_server: failed to register interface = '%s'\n", ifaces[i]));
 246                         talloc_free(ifaces);
 247                         return ret;
 248                 }
 249         }
 250
 251         talloc_free(ifaces);
 252         return NT_STATUS_OK;
 253 }
 254
 255 static BOOL remote_fill_interface(struct dcesrv_interface *iface, const struct ndr_interface_table *if_tabl)
 256 {
 257         iface->name = if_tabl->name;
 258         iface->syntax_id = if_tabl->syntax_id;
 259
 260         iface->bind = remote_op_bind;
 261         iface->unbind = remote_op_unbind;
 262
 263         iface->ndr_pull = remote_op_ndr_pull;
 264         iface->dispatch = remote_op_dispatch;
 265         iface->reply = remote_op_reply;
 266         iface->ndr_push = remote_op_ndr_push;
 267
 268         iface->private = if_tabl;
 269
 270         return True;
 271 }
 272
 273 static BOOL remote_op_interface_by_uuid(struct dcesrv_interface *iface, const struct GUID *uuid, uint32_t if_version)
 274 {
 275         const struct ndr_interface_list *l;
 276
 277         for (l=ndr_table_list();l;l=l->next) {
 278                 if (l->table->syntax_id.if_version == if_version &&
 279                         GUID_equal(&l->table->syntax_id.uuid, uuid)==0) {
 280                         return remote_fill_interface(iface, l->table);
 281                 }
 282         }
 283
 284         return False;
 285 }
 286
 287 static BOOL remote_op_interface_by_name(struct dcesrv_interface *iface, const char *name)
 288 {
 289         const struct ndr_interface_table *tbl = ndr_table_by_name(name);
 290
 291         if (tbl)
 292                 return remote_fill_interface(iface, tbl);
 293
 294         return False;
 295 }
 296
 297 NTSTATUS dcerpc_server_remote_init(void)
 298 {
 299         NTSTATUS ret;
 300         struct dcesrv_endpoint_server ep_server;
 301
 302         ZERO_STRUCT(ep_server);
 303
 304         /* fill in our name */
 305         ep_server.name = "remote";
 306
 307         /* fill in all the operations */
 308         ep_server.init_server = remote_op_init_server;
 309
 310         ep_server.interface_by_uuid = remote_op_interface_by_uuid;
 311         ep_server.interface_by_name = remote_op_interface_by_name;
 312
 313         /* register ourselves with the DCERPC subsystem. */
 314         ret = dcerpc_register_ep_server(&ep_server);
 315         if (!NT_STATUS_IS_OK(ret)) {
 316                 DEBUG(0,("Failed to register 'remote' endpoint server!\n"));
 317                 return ret;
 318         }
 319
 320         /* We need the full DCE/RPC interface table */
 321         ndr_table_init();
 322
 323         return ret;
 324 }