source3/rpc_server/rpc_ncacn_np_internal.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  RPC Pipe client / server routines
   4  *  Copyright (C) Andrew Tridgell              1992-1998,
   5  *  Largely re-written : 2005
   6  *  Copyright (C) Jeremy Allison                1998 - 2005
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 3 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "includes.h"
  23 #include "rpc_server/srv_pipe_internal.h"
  24
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_RPC_SRV
  27
  28 static int pipes_open;
  29
  30 static struct pipes_struct *InternalPipes;
  31
  32 /* TODO
  33  * the following prototypes are declared here to avoid
  34  * code being moved about too much for a patch to be
  35  * disrupted / less obvious.
  36  *
  37  * these functions, and associated functions that they
  38  * call, should be moved behind a .so module-loading
  39  * system _anyway_.  so that's the next step...
  40  */
  41
  42 static int close_internal_rpc_pipe_hnd(struct pipes_struct *p);
  43
  44 /****************************************************************************
  45  Internal Pipe iterator functions.
  46 ****************************************************************************/
  47
  48 struct pipes_struct *get_first_internal_pipe(void)
  49 {
  50         return InternalPipes;
  51 }
  52
  53 struct pipes_struct *get_next_internal_pipe(struct pipes_struct *p)
  54 {
  55         return p->next;
  56 }
  57
  58 static void free_pipe_rpc_context_internal( PIPE_RPC_FNS *list )
  59 {
  60         PIPE_RPC_FNS *tmp = list;
  61         PIPE_RPC_FNS *tmp2;
  62
  63         while (tmp) {
  64                 tmp2 = tmp->next;
  65                 SAFE_FREE(tmp);
  66                 tmp = tmp2;
  67         }
  68
  69         return;
  70 }
  71
  72 bool check_open_pipes(void)
  73 {
  74         struct pipes_struct *p;
  75
  76         for (p = InternalPipes; p != NULL; p = p->next) {
  77                 if (num_pipe_handles(p) != 0) {
  78                         return true;
  79                 }
  80         }
  81         return false;
  82 }
  83
  84 /****************************************************************************
  85  Close an rpc pipe.
  86 ****************************************************************************/
  87
  88 static int close_internal_rpc_pipe_hnd(struct pipes_struct *p)
  89 {
  90         if (!p) {
  91                 DEBUG(0,("Invalid pipe in close_internal_rpc_pipe_hnd\n"));
  92                 return False;
  93         }
  94
  95         if (p->auth.auth_data_free_func) {
  96                 (*p->auth.auth_data_free_func)(&p->auth);
  97         }
  98
  99         free_pipe_rpc_context_internal( p->contexts );
 100
 101         /* Free the handles database. */
 102         close_policy_by_pipe(p);
 103
 104         DLIST_REMOVE(InternalPipes, p);
 105
 106         ZERO_STRUCTP(p);
 107
 108         return 0;
 109 }
 110
 111 /****************************************************************************
 112  Make an internal namedpipes structure
 113 ****************************************************************************/
 114
 115 struct pipes_struct *make_internal_rpc_pipe_p(TALLOC_CTX *mem_ctx,
 116                                               const struct ndr_syntax_id *syntax,
 117                                               const char *client_address,
 118                                               struct auth_serversupplied_info *server_info)
 119 {
 120         struct pipes_struct *p;
 121
 122         DEBUG(4,("Create pipe requested %s\n",
 123                  get_pipe_name_from_syntax(talloc_tos(), syntax)));
 124
 125         p = TALLOC_ZERO_P(mem_ctx, struct pipes_struct);
 126
 127         if (!p) {
 128                 DEBUG(0,("ERROR! no memory for pipes_struct!\n"));
 129                 return NULL;
 130         }
 131
 132         p->mem_ctx = talloc_named(p, 0, "pipe %s %p",
 133                                  get_pipe_name_from_syntax(talloc_tos(),
 134                                                            syntax), p);
 135         if (p->mem_ctx == NULL) {
 136                 DEBUG(0,("open_rpc_pipe_p: talloc_init failed.\n"));
 137                 TALLOC_FREE(p);
 138                 return NULL;
 139         }
 140
 141         if (!init_pipe_handles(p, syntax)) {
 142                 DEBUG(0,("open_rpc_pipe_p: init_pipe_handles failed.\n"));
 143                 TALLOC_FREE(p);
 144                 return NULL;
 145         }
 146
 147         p->server_info = copy_serverinfo(p, server_info);
 148         if (p->server_info == NULL) {
 149                 DEBUG(0, ("open_rpc_pipe_p: copy_serverinfo failed\n"));
 150                 close_policy_by_pipe(p);
 151                 TALLOC_FREE(p);
 152                 return NULL;
 153         }
 154
 155         p->msg_ctx = smbd_messaging_context();
 156
 157         DLIST_ADD(InternalPipes, p);
 158
 159         strlcpy(p->client_address, client_address, sizeof(p->client_address));
 160
 161         p->endian = RPC_LITTLE_ENDIAN;
 162
 163         p->syntax = *syntax;
 164
 165         DEBUG(4,("Created internal pipe %s (pipes_open=%d)\n",
 166                  get_pipe_name_from_syntax(talloc_tos(), syntax), pipes_open));
 167
 168         talloc_set_destructor(p, close_internal_rpc_pipe_hnd);
 169
 170         return p;
 171 }
 172
 173 /****************************************************************************
 174 ****************************************************************************/
 175
 176 static NTSTATUS internal_ndr_push(TALLOC_CTX *mem_ctx,
 177                                   struct rpc_pipe_client *cli,
 178                                   const struct ndr_interface_table *table,
 179                                   uint32_t opnum,
 180                                   void *r)
 181 {
 182         const struct ndr_interface_call *call;
 183         struct ndr_push *push;
 184         enum ndr_err_code ndr_err;
 185
 186         if (!ndr_syntax_id_equal(&table->syntax_id, &cli->abstract_syntax) ||
 187             (opnum >= table->num_calls)) {
 188                 return NT_STATUS_INVALID_PARAMETER;
 189         }
 190
 191         call = &table->calls[opnum];
 192
 193         if (DEBUGLEVEL >= 10) {
 194                 ndr_print_function_debug(call->ndr_print,
 195                                          call->name, NDR_IN, r);
 196         }
 197
 198         push = ndr_push_init_ctx(mem_ctx);
 199         if (push == NULL) {
 200                 return NT_STATUS_NO_MEMORY;
 201         }
 202
 203         ndr_err = call->ndr_push(push, NDR_IN, r);
 204         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 205                 TALLOC_FREE(push);
 206                 return ndr_map_error2ntstatus(ndr_err);
 207         }
 208
 209         cli->pipes_struct->in_data.data = ndr_push_blob(push);
 210         talloc_steal(cli->pipes_struct->mem_ctx,
 211                      cli->pipes_struct->in_data.data.data);
 212         TALLOC_FREE(push);
 213
 214         return NT_STATUS_OK;
 215 }
 216
 217 /****************************************************************************
 218 ****************************************************************************/
 219
 220 static NTSTATUS internal_ndr_pull(TALLOC_CTX *mem_ctx,
 221                                   struct rpc_pipe_client *cli,
 222                                   const struct ndr_interface_table *table,
 223                                   uint32_t opnum,
 224                                   void *r)
 225 {
 226         const struct ndr_interface_call *call;
 227         struct ndr_pull *pull;
 228         enum ndr_err_code ndr_err;
 229
 230         if (!ndr_syntax_id_equal(&table->syntax_id, &cli->abstract_syntax) ||
 231             (opnum >= table->num_calls)) {
 232                 return NT_STATUS_INVALID_PARAMETER;
 233         }
 234
 235         call = &table->calls[opnum];
 236
 237         pull = ndr_pull_init_blob(&cli->pipes_struct->out_data.rdata,
 238                                   mem_ctx);
 239         if (pull == NULL) {
 240                 return NT_STATUS_NO_MEMORY;
 241         }
 242
 243         /* have the ndr parser alloc memory for us */
 244         pull->flags |= LIBNDR_FLAG_REF_ALLOC;
 245         ndr_err = call->ndr_pull(pull, NDR_OUT, r);
 246         TALLOC_FREE(pull);
 247
 248         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 249                 return ndr_map_error2ntstatus(ndr_err);
 250         }
 251
 252         if (DEBUGLEVEL >= 10) {
 253                 ndr_print_function_debug(call->ndr_print,
 254                                          call->name, NDR_OUT, r);
 255         }
 256
 257         return NT_STATUS_OK;
 258 }
 259
 260 /****************************************************************************
 261 ****************************************************************************/
 262
 263 static NTSTATUS rpc_pipe_internal_dispatch(struct rpc_pipe_client *cli,
 264                                            TALLOC_CTX *mem_ctx,
 265                                            const struct ndr_interface_table *table,
 266                                            uint32_t opnum, void *r)
 267 {
 268         NTSTATUS status;
 269         int num_cmds = rpc_srv_get_pipe_num_cmds(&table->syntax_id);
 270         const struct api_struct *cmds = rpc_srv_get_pipe_cmds(&table->syntax_id);
 271         int i;
 272
 273         if (cli->pipes_struct == NULL) {
 274                 return NT_STATUS_INVALID_PARAMETER;
 275         }
 276
 277         /* set opnum */
 278         cli->pipes_struct->opnum = opnum;
 279
 280         for (i = 0; i < num_cmds; i++) {
 281                 if (cmds[i].opnum == opnum && cmds[i].fn != NULL) {
 282                         break;
 283                 }
 284         }
 285
 286         if (i == num_cmds) {
 287                 return NT_STATUS_INVALID_PARAMETER;
 288         }
 289
 290         status = internal_ndr_push(mem_ctx, cli, table, opnum, r);
 291         if (!NT_STATUS_IS_OK(status)) {
 292                 return status;
 293         }
 294
 295         if (!cmds[i].fn(cli->pipes_struct)) {
 296                 data_blob_free(&cli->pipes_struct->in_data.data);
 297                 data_blob_free(&cli->pipes_struct->out_data.rdata);
 298                 talloc_free_children(cli->pipes_struct->mem_ctx);
 299                 return NT_STATUS_UNSUCCESSFUL;
 300         }
 301
 302         status = internal_ndr_pull(mem_ctx, cli, table, opnum, r);
 303         if (!NT_STATUS_IS_OK(status)) {
 304                 data_blob_free(&cli->pipes_struct->in_data.data);
 305                 data_blob_free(&cli->pipes_struct->out_data.rdata);
 306                 talloc_free_children(cli->pipes_struct->mem_ctx);
 307                 return status;
 308         }
 309
 310         data_blob_free(&cli->pipes_struct->in_data.data);
 311         data_blob_free(&cli->pipes_struct->out_data.rdata);
 312         talloc_free_children(cli->pipes_struct->mem_ctx);
 313
 314         return NT_STATUS_OK;
 315 }
 316
 317 /**
 318  * @brief Create a new RPC client context which uses a local dispatch function.
 319  *
 320  * @param[in]  mem_ctx  The memory context to use.
 321  *
 322  * @param[in]  abstract_syntax Normally the syntax_id of the autogenerated
 323  *                             ndr_table_<name>.
 324  *
 325  * @param[in]  dispatch The corresponding autogenerated dispatch function
 326  *                      rpc_<name>_dispatch.
 327  *
 328  * @param[in]  serversupplied_info The server supplied authentication function.
 329  *
 330  * @param[out] presult  A pointer to store the connected rpc client pipe.
 331  *
 332  * @return              NT_STATUS_OK on success, a corresponding NT status if an
 333  *                      error occured.
 334  *
 335  * @code
 336  *   struct rpc_pipe_client *winreg_pipe;
 337  *   NTSTATUS status;
 338  *
 339  *   status = rpc_pipe_open_internal(tmp_ctx,
 340  *                                   &ndr_table_winreg.syntax_id,
 341  *                                   rpc_winreg_dispatch,
 342  *                                   p->server_info,
 343  *                                   &winreg_pipe);
 344  * @endcode
 345  */
 346 NTSTATUS rpc_pipe_open_internal(TALLOC_CTX *mem_ctx,
 347                                 const struct ndr_syntax_id *abstract_syntax,
 348                                 struct auth_serversupplied_info *serversupplied_info,
 349                                 struct rpc_pipe_client **presult)
 350 {
 351         struct rpc_pipe_client *result;
 352
 353         result = TALLOC_ZERO_P(mem_ctx, struct rpc_pipe_client);
 354         if (result == NULL) {
 355                 return NT_STATUS_NO_MEMORY;
 356         }
 357
 358         result->abstract_syntax = *abstract_syntax;
 359         result->transfer_syntax = ndr_transfer_syntax;
 360         result->dispatch = rpc_pipe_internal_dispatch;
 361
 362         result->pipes_struct = make_internal_rpc_pipe_p(
 363                 result, abstract_syntax, "", serversupplied_info);
 364         if (result->pipes_struct == NULL) {
 365                 TALLOC_FREE(result);
 366                 return NT_STATUS_NO_MEMORY;
 367         }
 368
 369         result->max_xmit_frag = -1;
 370         result->max_recv_frag = -1;
 371
 372         *presult = result;
 373         return NT_STATUS_OK;
 374 }