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    Copyright (C) Julien Kerihuel 2008-2009
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2010
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "rpc_server/dcerpc_server.h"
  25 #include "auth/auth.h"
  26 #include "auth/credentials/credentials.h"
  27 #include "librpc/ndr/ndr_table.h"
  28 #include "param/param.h"
  29
  30
  31 struct dcesrv_remote_private {
  32         struct dcerpc_pipe *c_pipe;
  33 };
  34
  35 static NTSTATUS remote_op_reply(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
  36 {
  37         return NT_STATUS_OK;
  38 }
  39
  40 static NTSTATUS remote_op_bind(struct dcesrv_call_state *dce_call, const struct dcesrv_interface *iface)
  41 {
  42         NTSTATUS status;
  43         const struct ndr_interface_table *table;
  44         struct dcesrv_remote_private *priv;
  45         const char *binding = lp_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dcerpc_remote", "binding");
  46         const char *user, *pass, *domain;
  47         struct cli_credentials *credentials;
  48         bool must_free_credentials = true;
  49         bool machine_account;
  50         struct dcerpc_binding           *b;
  51         struct composite_context        *pipe_conn_req;
  52
  53         machine_account = lp_parm_bool(dce_call->conn->dce_ctx->lp_ctx, NULL, "dcerpc_remote", "use_machine_account", false);
  54
  55         priv = talloc(dce_call->conn, struct dcesrv_remote_private);
  56         if (!priv) {
  57                 return NT_STATUS_NO_MEMORY;
  58         }
  59
  60         priv->c_pipe = NULL;
  61         dce_call->context->private_data = priv;
  62
  63         if (!binding) {
  64                 DEBUG(0,("You must specify a DCE/RPC binding string\n"));
  65                 return NT_STATUS_INVALID_PARAMETER;
  66         }
  67
  68         user = lp_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dcerpc_remote", "user");
  69         pass = lp_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dcerpc_remote", "password");
  70         domain = lp_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "dceprc_remote", "domain");
  71
  72         table = ndr_table_by_uuid(&iface->syntax_id.uuid); /* FIXME: What about if_version ? */
  73         if (!table) {
  74                 dce_call->fault_code = DCERPC_FAULT_UNK_IF;
  75                 return NT_STATUS_NET_WRITE_FAULT;
  76         }
  77
  78         if (user && pass) {
  79                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using specified account\n"));
  80                 credentials = cli_credentials_init(priv);
  81                 if (!credentials) {
  82                         return NT_STATUS_NO_MEMORY;
  83                 }
  84                 cli_credentials_set_conf(credentials, dce_call->conn->dce_ctx->lp_ctx);
  85                 cli_credentials_set_username(credentials, user, CRED_SPECIFIED);
  86                 if (domain) {
  87                         cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
  88                 }
  89                 cli_credentials_set_password(credentials, pass, CRED_SPECIFIED);
  90         } else if (machine_account) {
  91                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using machine account\n"));
  92                 credentials = cli_credentials_init(priv);
  93                 cli_credentials_set_conf(credentials, dce_call->conn->dce_ctx->lp_ctx);
  94                 if (domain) {
  95                         cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
  96                 }
  97                 status = cli_credentials_set_machine_account(credentials, dce_call->conn->dce_ctx->lp_ctx);
  98                 if (!NT_STATUS_IS_OK(status)) {
  99                         return status;
 100                 }
 101         } else if (dce_call->conn->auth_state.session_info->credentials) {
 102                 DEBUG(5, ("dcerpc_remote: RPC Proxy: Using delegated credentials\n"));
 103                 credentials = dce_call->conn->auth_state.session_info->credentials;
 104                 must_free_credentials = false;
 105         } else {
 106                 DEBUG(1,("dcerpc_remote: RPC Proxy: You must supply binding, user and password or have delegated credentials\n"));
 107                 return NT_STATUS_INVALID_PARAMETER;
 108         }
 109
 110         /* parse binding string to the structure */
 111         status = dcerpc_parse_binding(dce_call->context, binding, &b);
 112         if (!NT_STATUS_IS_OK(status)) {
 113                 DEBUG(0, ("Failed to parse dcerpc binding '%s'\n", binding));
 114                 return status;
 115         }
 116
 117         DEBUG(3, ("Using binding %s\n", dcerpc_binding_string(dce_call->context, b)));
 118
 119         /* If we already have a remote association group ID, then use that */
 120         if (dce_call->context->assoc_group->proxied_id != 0) {
 121                 b->assoc_group_id = dce_call->context->assoc_group->proxied_id;
 122         }
 123
 124         pipe_conn_req = dcerpc_pipe_connect_b_send(dce_call->context, b, table,
 125                                                    credentials, dce_call->event_ctx, dce_call->conn->dce_ctx->lp_ctx);
 126         status = dcerpc_pipe_connect_b_recv(pipe_conn_req, dce_call->context, &(priv->c_pipe));
 127
 128         if (must_free_credentials) {
 129                 talloc_free(credentials);
 130         }
 131
 132         if (!NT_STATUS_IS_OK(status)) {
 133                 return status;
 134         }
 135
 136         if (dce_call->context->assoc_group->proxied_id == 0) {
 137                 dce_call->context->assoc_group->proxied_id = priv->c_pipe->assoc_group_id;
 138         }
 139
 140         if (!NT_STATUS_IS_OK(status)) {
 141                 return status;
 142         }
 143
 144         return NT_STATUS_OK;
 145 }
 146
 147 static void remote_op_unbind(struct dcesrv_connection_context *context, const struct dcesrv_interface *iface)
 148 {
 149         struct dcesrv_remote_private *priv = (struct dcesrv_remote_private *)context->private_data;
 150
 151         talloc_free(priv->c_pipe);
 152
 153         return;
 154 }
 155
 156 static NTSTATUS remote_op_ndr_pull(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_pull *pull, void **r)
 157 {
 158         enum ndr_err_code ndr_err;
 159         const struct ndr_interface_table *table = (const struct ndr_interface_table *)dce_call->context->iface->private_data;
 160         uint16_t opnum = dce_call->pkt.u.request.opnum;
 161
 162         dce_call->fault_code = 0;
 163
 164         if (opnum >= table->num_calls) {
 165                 dce_call->fault_code = DCERPC_FAULT_OP_RNG_ERROR;
 166                 return NT_STATUS_NET_WRITE_FAULT;
 167         }
 168
 169         *r = talloc_size(mem_ctx, table->calls[opnum].struct_size);
 170         if (!*r) {
 171                 return NT_STATUS_NO_MEMORY;
 172         }
 173
 174         /* unravel the NDR for the packet */
 175         ndr_err = table->calls[opnum].ndr_pull(pull, NDR_IN, *r);
 176         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 177                 dcerpc_log_packet(dce_call->conn->packet_log_dir,
 178                                                   table, opnum, NDR_IN,
 179                                   &dce_call->pkt.u.request.stub_and_verifier);
 180                 dce_call->fault_code = DCERPC_FAULT_NDR;
 181                 return NT_STATUS_NET_WRITE_FAULT;
 182         }
 183
 184         return NT_STATUS_OK;
 185 }
 186
 187 static NTSTATUS remote_op_dispatch(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, void *r)
 188 {
 189         struct dcesrv_remote_private *priv = dce_call->context->private_data;
 190         uint16_t opnum = dce_call->pkt.u.request.opnum;
 191         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 192         const struct ndr_interface_call *call;
 193         const char *name;
 194
 195         name = table->calls[opnum].name;
 196         call = &table->calls[opnum];
 197
 198         if (priv->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_IN) {
 199                 ndr_print_function_debug(call->ndr_print, name, NDR_IN | NDR_SET_VALUES, r);
 200         }
 201
 202         priv->c_pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 203
 204         /* we didn't use the return code of this function as we only check the last_fault_code */
 205         dcerpc_ndr_request(priv->c_pipe, NULL, table, opnum, mem_ctx,r);
 206
 207         dce_call->fault_code = priv->c_pipe->last_fault_code;
 208         if (dce_call->fault_code != 0) {
 209                 DEBUG(0,("dcesrv_remote: call[%s] failed with: %s!\n",name, dcerpc_errstr(mem_ctx, dce_call->fault_code)));
 210                 return NT_STATUS_NET_WRITE_FAULT;
 211         }
 212
 213         if ((dce_call->fault_code == 0) &&
 214             (priv->c_pipe->conn->flags & DCERPC_DEBUG_PRINT_OUT)) {
 215                 ndr_print_function_debug(call->ndr_print, name, NDR_OUT, r);
 216         }
 217
 218         return NT_STATUS_OK;
 219 }
 220
 221 static NTSTATUS remote_op_ndr_push(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct ndr_push *push, const void *r)
 222 {
 223         enum ndr_err_code ndr_err;
 224         const struct ndr_interface_table *table = dce_call->context->iface->private_data;
 225         uint16_t opnum = dce_call->pkt.u.request.opnum;
 226
 227         /* unravel the NDR for the packet */
 228         ndr_err = table->calls[opnum].ndr_push(push, NDR_OUT, r);
 229         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 230                 dce_call->fault_code = DCERPC_FAULT_NDR;
 231                 return NT_STATUS_NET_WRITE_FAULT;
 232         }
 233
 234         return NT_STATUS_OK;
 235 }
 236
 237 static NTSTATUS remote_register_one_iface(struct dcesrv_context *dce_ctx, const struct dcesrv_interface *iface)
 238 {
 239         int i;
 240         const struct ndr_interface_table *table = iface->private_data;
 241
 242         for (i=0;i<table->endpoints->count;i++) {
 243                 NTSTATUS ret;
 244                 const char *name = table->endpoints->names[i];
 245
 246                 ret = dcesrv_interface_register(dce_ctx, name, iface, NULL);
 247                 if (!NT_STATUS_IS_OK(ret)) {
 248                         DEBUG(1,("remote_op_init_server: failed to register endpoint '%s'\n",name));
 249                         return ret;
 250                 }
 251         }
 252
 253         return NT_STATUS_OK;
 254 }
 255
 256 static NTSTATUS remote_op_init_server(struct dcesrv_context *dce_ctx, const struct dcesrv_endpoint_server *ep_server)
 257 {
 258         int i;
 259         const char **ifaces = (const char **)str_list_make(dce_ctx, lp_parm_string(dce_ctx->lp_ctx, NULL, "dcerpc_remote", "interfaces"),NULL);
 260
 261         if (!ifaces) {
 262                 DEBUG(3,("remote_op_init_server: no interfaces configured\n"));
 263                 return NT_STATUS_OK;
 264         }
 265
 266         for (i=0;ifaces[i];i++) {
 267                 NTSTATUS ret;
 268                 struct dcesrv_interface iface;
 269
 270                 if (!ep_server->interface_by_name(&iface, ifaces[i])) {
 271                         DEBUG(0,("remote_op_init_server: failed to find interface = '%s'\n", ifaces[i]));
 272                         talloc_free(ifaces);
 273                         return NT_STATUS_UNSUCCESSFUL;
 274                 }
 275
 276                 ret = remote_register_one_iface(dce_ctx, &iface);
 277                 if (!NT_STATUS_IS_OK(ret)) {
 278                         DEBUG(0,("remote_op_init_server: failed to register interface = '%s'\n", ifaces[i]));
 279                         talloc_free(ifaces);
 280                         return ret;
 281                 }
 282         }
 283
 284         talloc_free(ifaces);
 285         return NT_STATUS_OK;
 286 }
 287
 288 static bool remote_fill_interface(struct dcesrv_interface *iface, const struct ndr_interface_table *if_tabl)
 289 {
 290         iface->name = if_tabl->name;
 291         iface->syntax_id = if_tabl->syntax_id;
 292
 293         iface->bind = remote_op_bind;
 294         iface->unbind = remote_op_unbind;
 295
 296         iface->ndr_pull = remote_op_ndr_pull;
 297         iface->dispatch = remote_op_dispatch;
 298         iface->reply = remote_op_reply;
 299         iface->ndr_push = remote_op_ndr_push;
 300
 301         iface->private_data = if_tabl;
 302
 303         return true;
 304 }
 305
 306 static bool remote_op_interface_by_uuid(struct dcesrv_interface *iface, const struct GUID *uuid, uint32_t if_version)
 307 {
 308         const struct ndr_interface_list *l;
 309
 310         for (l=ndr_table_list();l;l=l->next) {
 311                 if (l->table->syntax_id.if_version == if_version &&
 312                         GUID_equal(&l->table->syntax_id.uuid, uuid)==0) {
 313                         return remote_fill_interface(iface, l->table);
 314                 }
 315         }
 316
 317         return false;
 318 }
 319
 320 static bool remote_op_interface_by_name(struct dcesrv_interface *iface, const char *name)
 321 {
 322         const struct ndr_interface_table *tbl = ndr_table_by_name(name);
 323
 324         if (tbl)
 325                 return remote_fill_interface(iface, tbl);
 326
 327         return false;
 328 }
 329
 330 NTSTATUS dcerpc_server_remote_init(void)
 331 {
 332         NTSTATUS ret;
 333         struct dcesrv_endpoint_server ep_server;
 334
 335         ZERO_STRUCT(ep_server);
 336
 337         /* fill in our name */
 338         ep_server.name = "remote";
 339
 340         /* fill in all the operations */
 341         ep_server.init_server = remote_op_init_server;
 342
 343         ep_server.interface_by_uuid = remote_op_interface_by_uuid;
 344         ep_server.interface_by_name = remote_op_interface_by_name;
 345
 346         /* register ourselves with the DCERPC subsystem. */
 347         ret = dcerpc_register_ep_server(&ep_server);
 348         if (!NT_STATUS_IS_OK(ret)) {
 349                 DEBUG(0,("Failed to register 'remote' endpoint server!\n"));
 350                 return ret;
 351         }
 352
 353         /* We need the full DCE/RPC interface table */
 354         ndr_table_init();
 355
 356         return ret;
 357 }