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 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 #include "param/param.h"
  27
  28
  29 struct dcesrv_remote_private {
  30         struct dcerpc_pipe *c_pipe;
  31 };
  32
  33 static NTSTATUS remote_op_reply(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
  34 {
  35         return NT_STATUS_OK;
  36 }
  37
  38 static NTSTATUS remote_op_bind(struct dcesrv_call_state *dce_call, const struct dcesrv_interface *iface)
  39 {
  40         NTSTATUS status;
  41         const struct ndr_interface_table *table;
  42         struct dcesrv_remote_private *priv;
  43         const char *binding = lp_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dcerpc_remote", "binding");
  44         const char *user, *pass, *domain;
  45         struct cli_credentials *credentials;
  46         bool machine_account;
  47
  48         machine_account = lp_parm_bool(dce_call->conn->dce_ctx->lp_ctx, NULL, "dcerpc_remote", "use_machine_account", false);
  49
  50         priv = talloc(dce_call->conn, struct dcesrv_remote_private);
  51         if (!priv) {
  52                 return NT_STATUS_NO_MEMORY;
  53         }
  54
  55         priv->c_pipe = NULL;
  56         dce_call->context->private_data = priv;
  57
  58         if (!binding) {
  59                 DEBUG(0,("You must specify a DCE/RPC binding string\n"));
  60                 return NT_STATUS_INVALID_PARAMETER;
  61         }
  62
  63         user = lp_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dcerpc_remote", "user");
  64         pass = lp_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dcerpc_remote", "password");
  65         domain = lp_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dceprc_remote", "domain");
  66
  67         table = ndr_table_by_uuid(&iface->syntax_id.uuid); /* FIXME: What about if_version ? */
  68         if (!table) {
  69                 dce_call->fault_code = DCERPC_FAULT_UNK_IF;
  70                 return NT_STATUS_NET_WRITE_FAULT;
  71         }
  72
  73         if (user && pass) {
  74                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using specified account\n"));
  75                 credentials = cli_credentials_init(priv);
  76                 if (!credentials) {
  77                         return NT_STATUS_NO_MEMORY;
  78                 }
  79                 cli_credentials_set_conf(credentials, dce_call->conn->dce_ctx->lp_ctx);
  80                 cli_credentials_set_username(credentials, user, CRED_SPECIFIED);
  81                 if (domain) {
  82                         cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
  83                 }
  84                 cli_credentials_set_password(credentials, pass, CRED_SPECIFIED);
  85         } else if (machine_account) {
  86                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using machine account\n"));
  87                 credentials = cli_credentials_init(priv);
  88                 cli_credentials_set_conf(credentials, dce_call->conn->dce_ctx->lp_ctx);
  89                 if (domain) {
  90                         cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
  91                 }
  92                 status = cli_credentials_set_machine_account(credentials, dce_call->conn->dce_ctx->lp_ctx);
  93                 if (!NT_STATUS_IS_OK(status)) {
  94                         return status;
  95                 }
  96         } else if (dce_call->conn->auth_state.session_info->credentials) {
  97                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using delegated credentials\n"));
  98                 credentials = dce_call->conn->auth_state.session_info->credentials;
  99         } else {
 100                 DEBUG(1,("dcerpc_remote: RPC Proxy: You must supply binding, user and password or have delegated credentials\n"));
 101                 return NT_STATUS_INVALID_PARAMETER;
 102         }
 103
 104         status = dcerpc_pipe_connect(priv,
 105                                      &(priv->c_pipe), binding, table,
 106                                      credentials, dce_call->event_ctx,
 107                                      dce_call->conn->dce_ctx->lp_ctx);
 108
 109         talloc_free(credentials);
 110         if (!NT_STATUS_IS_OK(status)) {
 111                 return status;
 112         }
 113
 114         return NT_STATUS_OK;
 115 }
 116
 117 static void remote_op_unbind(struct dcesrv_connection_context *context, const struct dcesrv_interface *iface)
 118 {
 119         struct dcesrv_remote_private *priv = (struct dcesrv_remote_private *)context->private_data;
 120
 121         talloc_free(priv->c_pipe);
 122
 123         return;
 124 }
 125
 126 static NTSTATUS remote_op_ndr_pull(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_pull *pull, void **r)
 127 {
 128         enum ndr_err_code ndr_err;
 129         const struct ndr_interface_table *table = (const struct ndr_interface_table *)dce_call->context->iface->private_data;
 130         uint16_t opnum = dce_call->pkt.u.request.opnum;
 131
 132         dce_call->fault_code = 0;
 133
 134         if (opnum >= table->num_calls) {
 135                 dce_call->fault_code = DCERPC_FAULT_OP_RNG_ERROR;
 136                 return NT_STATUS_NET_WRITE_FAULT;
 137         }
 138
 139         *r = talloc_size(mem_ctx, table->calls[opnum].struct_size);
 140         if (!*r) {
 141                 return NT_STATUS_NO_MEMORY;
 142         }
 143
 144         /* unravel the NDR for the packet */
 145         ndr_err = table->calls[opnum].ndr_pull(pull, NDR_IN, *r);
 146         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 147                 dcerpc_log_packet(dce_call->conn->packet_log_dir,
 148                                                   table, opnum, NDR_IN,
 149                                   &dce_call->pkt.u.request.stub_and_verifier);
 150                 dce_call->fault_code = DCERPC_FAULT_NDR;
 151                 return NT_STATUS_NET_WRITE_FAULT;
 152         }
 153
 154         return NT_STATUS_OK;
 155 }
 156
 157 static NTSTATUS remote_op_dispatch(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
 158 {
 159         struct dcesrv_remote_private *priv = dce_call->context->private_data;
 160         uint16_t opnum = dce_call->pkt.u.request.opnum;
 161         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 162         const struct ndr_interface_call *call;
 163         const char *name;
 164
 165         name = table->calls[opnum].name;
 166         call = &table->calls[opnum];
 167
 168         if (priv->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_IN) {
 169                 ndr_print_function_debug(call->ndr_print, name, NDR_IN | NDR_SET_VALUES, r);
 170         }
 171
 172         priv->c_pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 173
 174         /* we didn't use the return code of this function as we only check the last_fault_code */
 175         dcerpc_ndr_request(priv->c_pipe, NULL, table, opnum, mem_ctx,r);
 176
 177         dce_call->fault_code = priv->c_pipe->last_fault_code;
 178         if (dce_call->fault_code != 0) {
 179                 DEBUG(0,("dcesrv_remote: call[%s] failed with: %s!\n",name, dcerpc_errstr(mem_ctx, dce_call->fault_code)));
 180                 return NT_STATUS_NET_WRITE_FAULT;
 181         }
 182
 183         if ((dce_call->fault_code == 0) &&
 184             (priv->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_OUT)) {
 185                 ndr_print_function_debug(call->ndr_print, name, NDR_OUT, r);
 186         }
 187
 188         return NT_STATUS_OK;
 189 }
 190
 191 static NTSTATUS remote_op_ndr_push(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_push *push, const void *r)
 192 {
 193         enum ndr_err_code ndr_err;
 194         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 195         uint16_t opnum = dce_call->pkt.u.request.opnum;
 196
 197         /* unravel the NDR for the packet */
 198         ndr_err = table->calls[opnum].ndr_push(push, NDR_OUT, r);
 199         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 200                 dce_call->fault_code = DCERPC_FAULT_NDR;
 201                 return NT_STATUS_NET_WRITE_FAULT;
 202         }
 203
 204         return NT_STATUS_OK;
 205 }
 206
 207 static NTSTATUS remote_register_one_iface(struct dcesrv_context *dce_ctx, const struct dcesrv_interface *iface)
 208 {
 209         int i;
 210         const struct ndr_interface_table *table = iface->private_data;
 211
 212         for (i=0;i<table->endpoints->count;i++) {
 213                 NTSTATUS ret;
 214                 const char *name = table->endpoints->names[i];
 215
 216                 ret = dcesrv_interface_register(dce_ctx, name, iface, NULL);
 217                 if (!NT_STATUS_IS_OK(ret)) {
 218                         DEBUG(1,("remote_op_init_server: failed to register endpoint '%s'\n",name));
 219                         return ret;
 220                 }
 221         }
 222
 223         return NT_STATUS_OK;
 224 }
 225
 226 static NTSTATUS remote_op_init_server(struct dcesrv_context *dce_ctx, const struct dcesrv_endpoint_server *ep_server)
 227 {
 228         int i;
 229         const char **ifaces = (const char **)str_list_make(dce_ctx, lp_parm_string(dce_ctx->lp_ctx, NULL, "dcerpc_remote", "interfaces"),NULL);
 230
 231         if (!ifaces) {
 232                 DEBUG(3,("remote_op_init_server: no interfaces configured\n"));
 233                 return NT_STATUS_OK;
 234         }
 235
 236         for (i=0;ifaces[i];i++) {
 237                 NTSTATUS ret;
 238                 struct dcesrv_interface iface;
 239
 240                 if (!ep_server->interface_by_name(&iface, ifaces[i])) {
 241                         DEBUG(0,("remote_op_init_server: failed to find interface = '%s'\n", ifaces[i]));
 242                         talloc_free(ifaces);
 243                         return NT_STATUS_UNSUCCESSFUL;
 244                 }
 245
 246                 ret = remote_register_one_iface(dce_ctx, &iface);
 247                 if (!NT_STATUS_IS_OK(ret)) {
 248                         DEBUG(0,("remote_op_init_server: failed to register interface = '%s'\n", ifaces[i]));
 249                         talloc_free(ifaces);
 250                         return ret;
 251                 }
 252         }
 253
 254         talloc_free(ifaces);
 255         return NT_STATUS_OK;
 256 }
 257
 258 static bool remote_fill_interface(struct dcesrv_interface *iface, const struct ndr_interface_table *if_tabl)
 259 {
 260         iface->name = if_tabl->name;
 261         iface->syntax_id = if_tabl->syntax_id;
 262
 263         iface->bind = remote_op_bind;
 264         iface->unbind = remote_op_unbind;
 265
 266         iface->ndr_pull = remote_op_ndr_pull;
 267         iface->dispatch = remote_op_dispatch;
 268         iface->reply = remote_op_reply;
 269         iface->ndr_push = remote_op_ndr_push;
 270
 271         iface->private_data = if_tabl;
 272
 273         return true;
 274 }
 275
 276 static bool remote_op_interface_by_uuid(struct dcesrv_interface *iface, const struct GUID *uuid, uint32_t if_version)
 277 {
 278         const struct ndr_interface_list *l;
 279
 280         for (l=ndr_table_list();l;l=l->next) {
 281                 if (l->table->syntax_id.if_version == if_version &&
 282                         GUID_equal(&l->table->syntax_id.uuid, uuid)==0) {
 283                         return remote_fill_interface(iface, l->table);
 284                 }
 285         }
 286
 287         return false;
 288 }
 289
 290 static bool remote_op_interface_by_name(struct dcesrv_interface *iface, const char *name)
 291 {
 292         const struct ndr_interface_table *tbl = ndr_table_by_name(name);
 293
 294         if (tbl)
 295                 return remote_fill_interface(iface, tbl);
 296
 297         return false;
 298 }
 299
 300 NTSTATUS dcerpc_server_remote_init(void)
 301 {
 302         NTSTATUS ret;
 303         struct dcesrv_endpoint_server ep_server;
 304
 305         ZERO_STRUCT(ep_server);
 306
 307         /* fill in our name */
 308         ep_server.name = "remote";
 309
 310         /* fill in all the operations */
 311         ep_server.init_server = remote_op_init_server;
 312
 313         ep_server.interface_by_uuid = remote_op_interface_by_uuid;
 314         ep_server.interface_by_name = remote_op_interface_by_name;
 315
 316         /* register ourselves with the DCERPC subsystem. */
 317         ret = dcerpc_register_ep_server(&ep_server);
 318         if (!NT_STATUS_IS_OK(ret)) {
 319                 DEBUG(0,("Failed to register 'remote' endpoint server!\n"));
 320                 return ret;
 321         }
 322
 323         /* We need the full DCE/RPC interface table */
 324         ndr_table_init();
 325
 326         return ret;
 327 }