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
   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 #include "auth/auth.h"
  25
  26
  27 struct dcesrv_remote_private {
  28         struct dcerpc_pipe *c_pipe;
  29 };
  30
  31 static NTSTATUS remote_op_bind(struct dcesrv_call_state *dce_call, const struct dcesrv_interface *iface)
  32 {
  33         NTSTATUS status;
  34         struct dcesrv_remote_private *private;
  35         const char *binding = lp_parm_string(-1, "dcerpc_remote", "binding");
  36         const char *user, *pass, *domain;
  37         struct cli_credentials *credentials;
  38         BOOL machine_account;
  39
  40         machine_account = lp_parm_bool(-1, "dcerpc_remote", "use_machine_account", False);
  41
  42         private = talloc(dce_call->conn, struct dcesrv_remote_private);
  43         if (!private) {
  44                 return NT_STATUS_NO_MEMORY;
  45         }
  46
  47         private->c_pipe = NULL;
  48         dce_call->context->private = private;
  49
  50         if (!binding) {
  51                 DEBUG(0,("You must specify a ncacn binding string\n"));
  52                 return NT_STATUS_INVALID_PARAMETER;
  53         }
  54
  55         user = lp_parm_string(-1, "dcerpc_remote", "user");
  56         pass = lp_parm_string(-1, "dcerpc_remote", "password");
  57         domain = lp_parm_string(-1, "dceprc_remote", "domain");
  58
  59         if (user && pass) {
  60                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using specified account\n"));
  61                 credentials = cli_credentials_init(private);
  62                 if (!credentials) {
  63                         return NT_STATUS_NO_MEMORY;
  64                 }
  65                 cli_credentials_set_conf(credentials);
  66                 cli_credentials_set_username(credentials, user, CRED_SPECIFIED);
  67                 if (domain) {
  68                         cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
  69                 }
  70                 cli_credentials_set_password(credentials, pass, CRED_SPECIFIED);
  71         } else if (machine_account) {
  72                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using machine account\n"));
  73                 credentials = cli_credentials_init(private);
  74                 cli_credentials_set_conf(credentials);
  75                 if (domain) {
  76                         cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
  77                 }
  78                 status = cli_credentials_set_machine_account(credentials);
  79                 if (!NT_STATUS_IS_OK(status)) {
  80                         return status;
  81                 }
  82         } else if (dce_call->conn->auth_state.session_info->credentials) {
  83                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using delegated credentials\n"));
  84                 credentials = dce_call->conn->auth_state.session_info->credentials;
  85         } else {
  86                 DEBUG(1,("dcerpc_remote: RPC Proxy: You must supply binding, user and password or have delegated credentials\n"));
  87                 return NT_STATUS_INVALID_PARAMETER;
  88         }
  89
  90         status = dcerpc_pipe_connect(private,
  91                                      &(private->c_pipe), binding,
  92                                      iface->uuid, iface->if_version,
  93                                      credentials, dce_call->event_ctx);
  94
  95         talloc_free(credentials);
  96         if (!NT_STATUS_IS_OK(status)) {
  97                 return status;
  98         }
  99
 100         return NT_STATUS_OK;
 101 }
 102
 103 static void remote_op_unbind(struct dcesrv_connection_context *context, const struct dcesrv_interface *iface)
 104 {
 105         struct dcesrv_remote_private *private = context->private;
 106
 107         talloc_free(private->c_pipe);
 108
 109         return;
 110 }
 111
 112 static NTSTATUS remote_op_ndr_pull(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_pull *pull, void **r)
 113 {
 114         NTSTATUS status;
 115         const struct dcerpc_interface_table *table = dce_call->context->iface->private;
 116         uint16_t opnum = dce_call->pkt.u.request.opnum;
 117
 118         dce_call->fault_code = 0;
 119
 120         if (opnum >= table->num_calls) {
 121                 dce_call->fault_code = DCERPC_FAULT_OP_RNG_ERROR;
 122                 return NT_STATUS_NET_WRITE_FAULT;
 123         }
 124
 125         *r = talloc_size(mem_ctx, table->calls[opnum].struct_size);
 126         if (!*r) {
 127                 return NT_STATUS_NO_MEMORY;
 128         }
 129
 130         /* unravel the NDR for the packet */
 131         status = table->calls[opnum].ndr_pull(pull, NDR_IN, *r);
 132         if (!NT_STATUS_IS_OK(status)) {
 133                 dcerpc_log_packet(table, opnum, NDR_IN,
 134                                   &dce_call->pkt.u.request.stub_and_verifier);
 135                 dce_call->fault_code = DCERPC_FAULT_NDR;
 136                 return NT_STATUS_NET_WRITE_FAULT;
 137         }
 138
 139         return NT_STATUS_OK;
 140 }
 141
 142 static NTSTATUS remote_op_dispatch(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
 143 {
 144         struct dcesrv_remote_private *private = dce_call->context->private;
 145         uint16_t opnum = dce_call->pkt.u.request.opnum;
 146         const struct dcerpc_interface_table *table = dce_call->context->iface->private;
 147         const struct dcerpc_interface_call *call;
 148         const char *name;
 149
 150         name = table->calls[opnum].name;
 151         call = &table->calls[opnum];
 152
 153         if (private->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_IN) {
 154                 ndr_print_function_debug(call->ndr_print, name, NDR_IN | NDR_SET_VALUES, r);
 155         }
 156
 157         /* we didn't use the return code of this function as we only check the last_fault_code */
 158         dcerpc_ndr_request(private->c_pipe, NULL, table, opnum, mem_ctx,r);
 159
 160         dce_call->fault_code = private->c_pipe->last_fault_code;
 161         if (dce_call->fault_code != 0) {
 162                 DEBUG(0,("dcesrv_remote: call[%s] failed with: %s!\n",name, dcerpc_errstr(mem_ctx, dce_call->fault_code)));
 163                 return NT_STATUS_NET_WRITE_FAULT;
 164         }
 165
 166         if ((dce_call->fault_code == 0) &&
 167             (private->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_OUT)) {
 168                 ndr_print_function_debug(call->ndr_print, name, NDR_OUT, r);
 169         }
 170
 171         return NT_STATUS_OK;
 172 }
 173
 174 static NTSTATUS remote_op_ndr_push(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_push *push, const void *r)
 175 {
 176         NTSTATUS status;
 177         const struct dcerpc_interface_table *table = dce_call->context->iface->private;
 178         uint16_t opnum = dce_call->pkt.u.request.opnum;
 179
 180         /* unravel the NDR for the packet */
 181         status = table->calls[opnum].ndr_push(push, NDR_OUT, r);
 182         if (!NT_STATUS_IS_OK(status)) {
 183                 dce_call->fault_code = DCERPC_FAULT_NDR;
 184                 return NT_STATUS_NET_WRITE_FAULT;
 185         }
 186
 187         return NT_STATUS_OK;
 188 }
 189
 190 static NTSTATUS remote_register_one_iface(struct dcesrv_context *dce_ctx, const struct dcesrv_interface *iface)
 191 {
 192         int i;
 193         const struct dcerpc_interface_table *table = iface->private;
 194
 195         for (i=0;i<table->endpoints->count;i++) {
 196                 NTSTATUS ret;
 197                 const char *name = table->endpoints->names[i];
 198
 199                 ret = dcesrv_interface_register(dce_ctx, name, iface, NULL);
 200                 if (!NT_STATUS_IS_OK(ret)) {
 201                         DEBUG(1,("remote_op_init_server: failed to register endpoint '%s'\n",name));
 202                         return ret;
 203                 }
 204         }
 205
 206         return NT_STATUS_OK;
 207 }
 208
 209 static NTSTATUS remote_op_init_server(struct dcesrv_context *dce_ctx, const struct dcesrv_endpoint_server *ep_server)
 210 {
 211         int i;
 212         const char **ifaces = str_list_make(dce_ctx, lp_parm_string(-1,"dcerpc_remote","interfaces"),NULL);
 213
 214         if (!ifaces) {
 215                 DEBUG(3,("remote_op_init_server: no interfaces configured\n"));
 216                 return NT_STATUS_OK;
 217         }
 218
 219         for (i=0;ifaces[i];i++) {
 220                 NTSTATUS ret;
 221                 struct dcesrv_interface iface;
 222
 223                 if (!ep_server->interface_by_name(&iface, ifaces[i])) {
 224                         DEBUG(0,("remote_op_init_server: failed to find interface = '%s'\n", ifaces[i]));
 225                         talloc_free(ifaces);
 226                         return NT_STATUS_UNSUCCESSFUL;
 227                 }
 228
 229                 ret = remote_register_one_iface(dce_ctx, &iface);
 230                 if (!NT_STATUS_IS_OK(ret)) {
 231                         DEBUG(0,("remote_op_init_server: failed to register interface = '%s'\n", ifaces[i]));
 232                         talloc_free(ifaces);
 233                         return ret;
 234                 }
 235         }
 236
 237         talloc_free(ifaces);
 238         return NT_STATUS_OK;
 239 }
 240
 241 static BOOL remote_fill_interface(struct dcesrv_interface *iface, const struct dcerpc_interface_table *if_tabl)
 242 {
 243         iface->name = if_tabl->name;
 244         iface->uuid = if_tabl->uuid;
 245         iface->if_version = if_tabl->if_version;
 246
 247         iface->bind = remote_op_bind;
 248         iface->unbind = remote_op_unbind;
 249
 250         iface->ndr_pull = remote_op_ndr_pull;
 251         iface->dispatch = remote_op_dispatch;
 252         iface->ndr_push = remote_op_ndr_push;
 253
 254         iface->private = if_tabl;
 255
 256         return True;
 257 }
 258
 259 static BOOL remote_op_interface_by_uuid(struct dcesrv_interface *iface, const char *uuid, uint32_t if_version)
 260 {
 261         const struct dcerpc_interface_list *l;
 262
 263         for (l=librpc_dcerpc_pipes();l;l=l->next) {
 264                 if (l->table->if_version == if_version &&
 265                         strcmp(l->table->uuid, uuid)==0) {
 266                         return remote_fill_interface(iface, l->table);
 267                 }
 268         }
 269
 270         return False;
 271 }
 272
 273 static BOOL remote_op_interface_by_name(struct dcesrv_interface *iface, const char *name)
 274 {
 275         const struct dcerpc_interface_list *l;
 276
 277         for (l=librpc_dcerpc_pipes();l;l=l->next) {
 278                 if (strcmp(l->table->name, name)==0) {
 279                         return remote_fill_interface(iface, l->table);
 280                 }
 281         }
 282
 283         return False;
 284 }
 285
 286 NTSTATUS dcerpc_server_remote_init(void)
 287 {
 288         NTSTATUS ret;
 289         struct dcesrv_endpoint_server ep_server;
 290
 291         ZERO_STRUCT(ep_server);
 292
 293         /* fill in our name */
 294         ep_server.name = "remote";
 295
 296         /* fill in all the operations */
 297         ep_server.init_server = remote_op_init_server;
 298
 299         ep_server.interface_by_uuid = remote_op_interface_by_uuid;
 300         ep_server.interface_by_name = remote_op_interface_by_name;
 301
 302         /* register ourselves with the DCERPC subsystem. */
 303         ret = dcerpc_register_ep_server(&ep_server);
 304         if (!NT_STATUS_IS_OK(ret)) {
 305                 DEBUG(0,("Failed to register 'remote' endpoint server!\n"));
 306                 return ret;
 307         }
 308
 309         return ret;
 310 }