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 2 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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23 #include "rpc_server/dcerpc_server.h"
  24
  25 struct dcesrv_remote_private {
  26         struct dcerpc_pipe *c_pipe;
  27 };
  28
  29 static NTSTATUS remote_op_bind(struct dcesrv_call_state *dce_call, const struct dcesrv_interface *iface)
  30 {
  31         NTSTATUS status;
  32         struct dcesrv_remote_private *private;
  33         const char *binding = lp_parm_string(-1, "dcerpc_remote", "binding");
  34         struct cli_credentials *credentials;
  35
  36         if (!binding) {
  37                 DEBUG(0,("You must specify a ncacn binding string\n"));
  38                 return NT_STATUS_INVALID_PARAMETER;
  39         }
  40
  41         private = talloc(dce_call->conn, struct dcesrv_remote_private);
  42         if (!private) {
  43                 return NT_STATUS_NO_MEMORY;
  44         }
  45
  46         credentials = cli_credentials_init(private);
  47
  48         cli_credentials_set_username(credentials, lp_parm_string(-1, "dcerpc_remote", "username"), CRED_SPECIFIED);
  49         cli_credentials_set_workstation(credentials, lp_netbios_name(), CRED_SPECIFIED);
  50         cli_credentials_set_domain(credentials, lp_workgroup(), CRED_SPECIFIED);
  51         cli_credentials_set_password(credentials, lp_parm_string(-1, "dcerpc_remote", "password"), CRED_SPECIFIED);
  52
  53         status = dcerpc_pipe_connect(private,
  54                                      &(private->c_pipe), binding,
  55                                      iface->uuid, iface->if_version,
  56                                      credentials, dce_call->event_ctx);
  57
  58         talloc_free(credentials);
  59         if (!NT_STATUS_IS_OK(status)) {
  60                 return status;
  61         }
  62
  63         dce_call->context->private = private;
  64
  65         return NT_STATUS_OK;
  66 }
  67
  68 static void remote_op_unbind(struct dcesrv_connection_context *context, const struct dcesrv_interface *iface)
  69 {
  70         struct dcesrv_remote_private *private = context->private;
  71
  72         talloc_free(private->c_pipe);
  73
  74         return;
  75 }
  76
  77 static NTSTATUS remote_op_ndr_pull(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_pull *pull, void **r)
  78 {
  79         NTSTATUS status;
  80         const struct dcerpc_interface_table *table = dce_call->context->iface->private;
  81         uint16_t opnum = dce_call->pkt.u.request.opnum;
  82
  83         dce_call->fault_code = 0;
  84
  85         if (opnum >= table->num_calls) {
  86                 dce_call->fault_code = DCERPC_FAULT_OP_RNG_ERROR;
  87                 return NT_STATUS_NET_WRITE_FAULT;
  88         }
  89
  90         *r = talloc_size(mem_ctx, table->calls[opnum].struct_size);
  91         if (!*r) {
  92                 return NT_STATUS_NO_MEMORY;
  93         }
  94
  95         /* unravel the NDR for the packet */
  96         status = table->calls[opnum].ndr_pull(pull, NDR_IN, *r);
  97         if (!NT_STATUS_IS_OK(status)) {
  98                 dcerpc_log_packet(table, opnum, NDR_IN,
  99                                   &dce_call->pkt.u.request.stub_and_verifier);
 100                 dce_call->fault_code = DCERPC_FAULT_NDR;
 101                 return NT_STATUS_NET_WRITE_FAULT;
 102         }
 103
 104         return NT_STATUS_OK;
 105 }
 106
 107 static NTSTATUS remote_op_dispatch(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
 108 {
 109         struct dcesrv_remote_private *private = dce_call->context->private;
 110         uint16_t opnum = dce_call->pkt.u.request.opnum;
 111         const struct dcerpc_interface_table *table = dce_call->context->iface->private;
 112         const struct dcerpc_interface_call *call;
 113         const char *name;
 114
 115         name = table->calls[opnum].name;
 116         call = &table->calls[opnum];
 117
 118         if (private->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_IN) {
 119                 ndr_print_function_debug(call->ndr_print, name, NDR_IN | NDR_SET_VALUES, r);
 120         }
 121
 122         /* we didn't use the return code of this function as we only check the last_fault_code */
 123         dcerpc_ndr_request(private->c_pipe, NULL, table, opnum, mem_ctx,r);
 124
 125         dce_call->fault_code = private->c_pipe->last_fault_code;
 126         if (dce_call->fault_code != 0) {
 127                 DEBUG(0,("dcesrv_remote: call[%s] failed with: %s!\n",name, dcerpc_errstr(mem_ctx, dce_call->fault_code)));
 128                 return NT_STATUS_NET_WRITE_FAULT;
 129         }
 130
 131         if ((dce_call->fault_code == 0) &&
 132             (private->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_OUT)) {
 133                 ndr_print_function_debug(call->ndr_print, name, NDR_OUT, r);
 134         }
 135
 136         return NT_STATUS_OK;
 137 }
 138
 139 static NTSTATUS remote_op_ndr_push(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_push *push, const void *r)
 140 {
 141         NTSTATUS status;
 142         const struct dcerpc_interface_table *table = dce_call->context->iface->private;
 143         uint16_t opnum = dce_call->pkt.u.request.opnum;
 144
 145         /* unravel the NDR for the packet */
 146         status = table->calls[opnum].ndr_push(push, NDR_OUT, r);
 147         if (!NT_STATUS_IS_OK(status)) {
 148                 dce_call->fault_code = DCERPC_FAULT_NDR;
 149                 return NT_STATUS_NET_WRITE_FAULT;
 150         }
 151
 152         return NT_STATUS_OK;
 153 }
 154
 155 static NTSTATUS remote_register_one_iface(struct dcesrv_context *dce_ctx, const struct dcesrv_interface *iface)
 156 {
 157         int i;
 158         const struct dcerpc_interface_table *table = iface->private;
 159
 160         for (i=0;i<table->endpoints->count;i++) {
 161                 NTSTATUS ret;
 162                 const char *name = table->endpoints->names[i];
 163
 164                 ret = dcesrv_interface_register(dce_ctx, name, iface, NULL);
 165                 if (!NT_STATUS_IS_OK(ret)) {
 166                         DEBUG(1,("remote_op_init_server: failed to register endpoint '%s'\n",name));
 167                         return ret;
 168                 }
 169         }
 170
 171         return NT_STATUS_OK;
 172 }
 173
 174 static NTSTATUS remote_op_init_server(struct dcesrv_context *dce_ctx, const struct dcesrv_endpoint_server *ep_server)
 175 {
 176         int i;
 177         const char **ifaces = str_list_make(dce_ctx, lp_parm_string(-1,"dcerpc_remote","interfaces"),NULL);
 178
 179         if (!ifaces) {
 180                 DEBUG(3,("remote_op_init_server: no interfaces configured\n"));
 181                 return NT_STATUS_OK;
 182         }
 183
 184         for (i=0;ifaces[i];i++) {
 185                 NTSTATUS ret;
 186                 struct dcesrv_interface iface;
 187
 188                 if (!ep_server->interface_by_name(&iface, ifaces[i])) {
 189                         DEBUG(0,("remote_op_init_server: failed to find interface = '%s'\n", ifaces[i]));
 190                         talloc_free(ifaces);
 191                         return NT_STATUS_UNSUCCESSFUL;
 192                 }
 193
 194                 ret = remote_register_one_iface(dce_ctx, &iface);
 195                 if (!NT_STATUS_IS_OK(ret)) {
 196                         DEBUG(0,("remote_op_init_server: failed to register interface = '%s'\n", ifaces[i]));
 197                         talloc_free(ifaces);
 198                         return ret;
 199                 }
 200         }
 201
 202         talloc_free(ifaces);
 203         return NT_STATUS_OK;
 204 }
 205
 206 static BOOL remote_fill_interface(struct dcesrv_interface *iface, const struct dcerpc_interface_table *if_tabl)
 207 {
 208         iface->name = if_tabl->name;
 209         iface->uuid = if_tabl->uuid;
 210         iface->if_version = if_tabl->if_version;
 211
 212         iface->bind = remote_op_bind;
 213         iface->unbind = remote_op_unbind;
 214
 215         iface->ndr_pull = remote_op_ndr_pull;
 216         iface->dispatch = remote_op_dispatch;
 217         iface->ndr_push = remote_op_ndr_push;
 218
 219         iface->private = if_tabl;
 220
 221         return True;
 222 }
 223
 224 static BOOL remote_op_interface_by_uuid(struct dcesrv_interface *iface, const char *uuid, uint32_t if_version)
 225 {
 226         const struct dcerpc_interface_list *l;
 227
 228         for (l=librpc_dcerpc_pipes();l;l=l->next) {
 229                 if (l->table->if_version == if_version &&
 230                         strcmp(l->table->uuid, uuid)==0) {
 231                         return remote_fill_interface(iface, l->table);
 232                 }
 233         }
 234
 235         return False;
 236 }
 237
 238 static BOOL remote_op_interface_by_name(struct dcesrv_interface *iface, const char *name)
 239 {
 240         const struct dcerpc_interface_list *l;
 241
 242         for (l=librpc_dcerpc_pipes();l;l=l->next) {
 243                 if (strcmp(l->table->name, name)==0) {
 244                         return remote_fill_interface(iface, l->table);
 245                 }
 246         }
 247
 248         return False;
 249 }
 250
 251 NTSTATUS dcerpc_server_remote_init(void)
 252 {
 253         NTSTATUS ret;
 254         struct dcesrv_endpoint_server ep_server;
 255
 256         ZERO_STRUCT(ep_server);
 257
 258         /* fill in our name */
 259         ep_server.name = "remote";
 260
 261         /* fill in all the operations */
 262         ep_server.init_server = remote_op_init_server;
 263
 264         ep_server.interface_by_uuid = remote_op_interface_by_uuid;
 265         ep_server.interface_by_name = remote_op_interface_by_name;
 266
 267         /* register ourselves with the DCERPC subsystem. */
 268         ret = dcerpc_register_ep_server(&ep_server);
 269         if (!NT_STATUS_IS_OK(ret)) {
 270                 DEBUG(0,("Failed to register 'remote' endpoint server!\n"));
 271                 return ret;
 272         }
 273
 274         return ret;
 275 }