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 *private;
  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         private = talloc(dce_call->conn, struct dcesrv_remote_private);
  51         if (!private) {
  52                 return NT_STATUS_NO_MEMORY;
  53         }
  54
  55         private->c_pipe = NULL;
  56         dce_call->context->private = private;
  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(private);
  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(private);
  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(private,
 105                                      &(private->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 *private = (struct dcesrv_remote_private *)context->private;
 120
 121         talloc_free(private->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;
 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(table, opnum, NDR_IN,
 148                                   &dce_call->pkt.u.request.stub_and_verifier);
 149                 dce_call->fault_code = DCERPC_FAULT_NDR;
 150                 return NT_STATUS_NET_WRITE_FAULT;
 151         }
 152
 153         return NT_STATUS_OK;
 154 }
 155
 156 static NTSTATUS remote_op_dispatch(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
 157 {
 158         struct dcesrv_remote_private *private = dce_call->context->private;
 159         uint16_t opnum = dce_call->pkt.u.request.opnum;
 160         const struct ndr_interface_table *table = dce_call->context->iface->private;
 161         const struct ndr_interface_call *call;
 162         const char *name;
 163
 164         name = table->calls[opnum].name;
 165         call = &table->calls[opnum];
 166
 167         if (private->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_IN) {
 168                 ndr_print_function_debug(call->ndr_print, name, NDR_IN | NDR_SET_VALUES, r);
 169         }
 170
 171         private->c_pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 172
 173         /* we didn't use the return code of this function as we only check the last_fault_code */
 174         dcerpc_ndr_request(private->c_pipe, NULL, table, opnum, mem_ctx,r);
 175
 176         dce_call->fault_code = private->c_pipe->last_fault_code;
 177         if (dce_call->fault_code != 0) {
 178                 DEBUG(0,("dcesrv_remote: call[%s] failed with: %s!\n",name, dcerpc_errstr(mem_ctx, dce_call->fault_code)));
 179                 return NT_STATUS_NET_WRITE_FAULT;
 180         }
 181
 182         if ((dce_call->fault_code == 0) &&
 183             (private->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_OUT)) {
 184                 ndr_print_function_debug(call->ndr_print, name, NDR_OUT, r);
 185         }
 186
 187         return NT_STATUS_OK;
 188 }
 189
 190 static NTSTATUS remote_op_ndr_push(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_push *push, const void *r)
 191 {
 192         enum ndr_err_code ndr_err;
 193         const struct ndr_interface_table *table = dce_call->context->iface->private;
 194         uint16_t opnum = dce_call->pkt.u.request.opnum;
 195
 196         /* unravel the NDR for the packet */
 197         ndr_err = table->calls[opnum].ndr_push(push, NDR_OUT, r);
 198         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 199                 dce_call->fault_code = DCERPC_FAULT_NDR;
 200                 return NT_STATUS_NET_WRITE_FAULT;
 201         }
 202
 203         return NT_STATUS_OK;
 204 }
 205
 206 static NTSTATUS remote_register_one_iface(struct dcesrv_context *dce_ctx, const struct dcesrv_interface *iface)
 207 {
 208         int i;
 209         const struct ndr_interface_table *table = iface->private;
 210
 211         for (i=0;i<table->endpoints->count;i++) {
 212                 NTSTATUS ret;
 213                 const char *name = table->endpoints->names[i];
 214
 215                 ret = dcesrv_interface_register(dce_ctx, name, iface, NULL);
 216                 if (!NT_STATUS_IS_OK(ret)) {
 217                         DEBUG(1,("remote_op_init_server: failed to register endpoint '%s'\n",name));
 218                         return ret;
 219                 }
 220         }
 221
 222         return NT_STATUS_OK;
 223 }
 224
 225 static NTSTATUS remote_op_init_server(struct dcesrv_context *dce_ctx, const struct dcesrv_endpoint_server *ep_server)
 226 {
 227         int i;
 228         const char **ifaces = (const char **)str_list_make(dce_ctx, lp_parm_string(dce_ctx->lp_ctx, NULL, "dcerpc_remote", "interfaces"),NULL);
 229
 230         if (!ifaces) {
 231                 DEBUG(3,("remote_op_init_server: no interfaces configured\n"));
 232                 return NT_STATUS_OK;
 233         }
 234
 235         for (i=0;ifaces[i];i++) {
 236                 NTSTATUS ret;
 237                 struct dcesrv_interface iface;
 238
 239                 if (!ep_server->interface_by_name(&iface, ifaces[i])) {
 240                         DEBUG(0,("remote_op_init_server: failed to find interface = '%s'\n", ifaces[i]));
 241                         talloc_free(ifaces);
 242                         return NT_STATUS_UNSUCCESSFUL;
 243                 }
 244
 245                 ret = remote_register_one_iface(dce_ctx, &iface);
 246                 if (!NT_STATUS_IS_OK(ret)) {
 247                         DEBUG(0,("remote_op_init_server: failed to register interface = '%s'\n", ifaces[i]));
 248                         talloc_free(ifaces);
 249                         return ret;
 250                 }
 251         }
 252
 253         talloc_free(ifaces);
 254         return NT_STATUS_OK;
 255 }
 256
 257 static bool remote_fill_interface(struct dcesrv_interface *iface, const struct ndr_interface_table *if_tabl)
 258 {
 259         iface->name = if_tabl->name;
 260         iface->syntax_id = if_tabl->syntax_id;
 261
 262         iface->bind = remote_op_bind;
 263         iface->unbind = remote_op_unbind;
 264
 265         iface->ndr_pull = remote_op_ndr_pull;
 266         iface->dispatch = remote_op_dispatch;
 267         iface->reply = remote_op_reply;
 268         iface->ndr_push = remote_op_ndr_push;
 269
 270         iface->private = if_tabl;
 271
 272         return true;
 273 }
 274
 275 static bool remote_op_interface_by_uuid(struct dcesrv_interface *iface, const struct GUID *uuid, uint32_t if_version)
 276 {
 277         const struct ndr_interface_list *l;
 278
 279         for (l=ndr_table_list();l;l=l->next) {
 280                 if (l->table->syntax_id.if_version == if_version &&
 281                         GUID_equal(&l->table->syntax_id.uuid, uuid)==0) {
 282                         return remote_fill_interface(iface, l->table);
 283                 }
 284         }
 285
 286         return false;
 287 }
 288
 289 static bool remote_op_interface_by_name(struct dcesrv_interface *iface, const char *name)
 290 {
 291         const struct ndr_interface_table *tbl = ndr_table_by_name(name);
 292
 293         if (tbl)
 294                 return remote_fill_interface(iface, tbl);
 295
 296         return false;
 297 }
 298
 299 NTSTATUS dcerpc_server_remote_init(void)
 300 {
 301         NTSTATUS ret;
 302         struct dcesrv_endpoint_server ep_server;
 303
 304         ZERO_STRUCT(ep_server);
 305
 306         /* fill in our name */
 307         ep_server.name = "remote";
 308
 309         /* fill in all the operations */
 310         ep_server.init_server = remote_op_init_server;
 311
 312         ep_server.interface_by_uuid = remote_op_interface_by_uuid;
 313         ep_server.interface_by_name = remote_op_interface_by_name;
 314
 315         /* register ourselves with the DCERPC subsystem. */
 316         ret = dcerpc_register_ep_server(&ep_server);
 317         if (!NT_STATUS_IS_OK(ret)) {
 318                 DEBUG(0,("Failed to register 'remote' endpoint server!\n"));
 319                 return ret;
 320         }
 321
 322         /* We need the full DCE/RPC interface table */
 323         ndr_table_init();
 324
 325         return ret;
 326 }