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 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         DLIST_ADD(InternalPipes, p);
 156
 157         strlcpy(p->client_address, client_address, sizeof(p->client_address));
 158
 159         p->endian = RPC_LITTLE_ENDIAN;
 160
 161         p->syntax = *syntax;
 162
 163         DEBUG(4,("Created internal pipe %s (pipes_open=%d)\n",
 164                  get_pipe_name_from_syntax(talloc_tos(), syntax), pipes_open));
 165
 166         talloc_set_destructor(p, close_internal_rpc_pipe_hnd);
 167
 168         return p;
 169 }
 170
 171 /****************************************************************************
 172 ****************************************************************************/
 173
 174 static NTSTATUS internal_ndr_push(TALLOC_CTX *mem_ctx,
 175                                   struct rpc_pipe_client *cli,
 176                                   const struct ndr_interface_table *table,
 177                                   uint32_t opnum,
 178                                   void *r)
 179 {
 180         const struct ndr_interface_call *call;
 181         struct ndr_push *push;
 182         enum ndr_err_code ndr_err;
 183
 184         if (!ndr_syntax_id_equal(&table->syntax_id, &cli->abstract_syntax) ||
 185             (opnum >= table->num_calls)) {
 186                 return NT_STATUS_INVALID_PARAMETER;
 187         }
 188
 189         call = &table->calls[opnum];
 190
 191         if (DEBUGLEVEL >= 10) {
 192                 ndr_print_function_debug(call->ndr_print,
 193                                          call->name, NDR_IN, r);
 194         }
 195
 196         push = ndr_push_init_ctx(mem_ctx);
 197         if (push == NULL) {
 198                 return NT_STATUS_NO_MEMORY;
 199         }
 200
 201         ndr_err = call->ndr_push(push, NDR_IN, r);
 202         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 203                 TALLOC_FREE(push);
 204                 return ndr_map_error2ntstatus(ndr_err);
 205         }
 206
 207         cli->pipes_struct->in_data.data = ndr_push_blob(push);
 208         talloc_steal(cli->pipes_struct->mem_ctx,
 209                      cli->pipes_struct->in_data.data.data);
 210         TALLOC_FREE(push);
 211
 212         return NT_STATUS_OK;
 213 }
 214
 215 /****************************************************************************
 216 ****************************************************************************/
 217
 218 static NTSTATUS internal_ndr_pull(TALLOC_CTX *mem_ctx,
 219                                   struct rpc_pipe_client *cli,
 220                                   const struct ndr_interface_table *table,
 221                                   uint32_t opnum,
 222                                   void *r)
 223 {
 224         const struct ndr_interface_call *call;
 225         struct ndr_pull *pull;
 226         enum ndr_err_code ndr_err;
 227
 228         if (!ndr_syntax_id_equal(&table->syntax_id, &cli->abstract_syntax) ||
 229             (opnum >= table->num_calls)) {
 230                 return NT_STATUS_INVALID_PARAMETER;
 231         }
 232
 233         call = &table->calls[opnum];
 234
 235         pull = ndr_pull_init_blob(&cli->pipes_struct->out_data.rdata,
 236                                   mem_ctx);
 237         if (pull == NULL) {
 238                 return NT_STATUS_NO_MEMORY;
 239         }
 240
 241         /* have the ndr parser alloc memory for us */
 242         pull->flags |= LIBNDR_FLAG_REF_ALLOC;
 243         ndr_err = call->ndr_pull(pull, NDR_OUT, r);
 244         TALLOC_FREE(pull);
 245
 246         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 247                 return ndr_map_error2ntstatus(ndr_err);
 248         }
 249
 250         if (DEBUGLEVEL >= 10) {
 251                 ndr_print_function_debug(call->ndr_print,
 252                                          call->name, NDR_OUT, r);
 253         }
 254
 255         return NT_STATUS_OK;
 256 }
 257
 258 /****************************************************************************
 259 ****************************************************************************/
 260
 261 static NTSTATUS rpc_pipe_internal_dispatch(struct rpc_pipe_client *cli,
 262                                            TALLOC_CTX *mem_ctx,
 263                                            const struct ndr_interface_table *table,
 264                                            uint32_t opnum, void *r)
 265 {
 266         NTSTATUS status;
 267         int num_cmds = rpc_srv_get_pipe_num_cmds(&table->syntax_id);
 268         const struct api_struct *cmds = rpc_srv_get_pipe_cmds(&table->syntax_id);
 269         int i;
 270
 271         if (cli->pipes_struct == NULL) {
 272                 return NT_STATUS_INVALID_PARAMETER;
 273         }
 274
 275         /* set opnum */
 276         cli->pipes_struct->opnum = opnum;
 277
 278         for (i = 0; i < num_cmds; i++) {
 279                 if (cmds[i].opnum == opnum && cmds[i].fn != NULL) {
 280                         break;
 281                 }
 282         }
 283
 284         if (i == num_cmds) {
 285                 return NT_STATUS_INVALID_PARAMETER;
 286         }
 287
 288         status = internal_ndr_push(mem_ctx, cli, table, opnum, r);
 289         if (!NT_STATUS_IS_OK(status)) {
 290                 return status;
 291         }
 292
 293         if (!cmds[i].fn(cli->pipes_struct)) {
 294                 return NT_STATUS_UNSUCCESSFUL;
 295         }
 296
 297         status = internal_ndr_pull(mem_ctx, cli, table, opnum, r);
 298         if (!NT_STATUS_IS_OK(status)) {
 299                 return status;
 300         }
 301
 302         data_blob_free(&cli->pipes_struct->in_data.data);
 303         data_blob_free(&cli->pipes_struct->out_data.rdata);
 304
 305         return NT_STATUS_OK;
 306 }
 307
 308 /**
 309  * @brief Create a new RPC client context which uses a local dispatch function.
 310  *
 311  * @param[in]  mem_ctx  The memory context to use.
 312  *
 313  * @param[in]  abstract_syntax Normally the syntax_id of the autogenerated
 314  *                             ndr_table_<name>.
 315  *
 316  * @param[in]  dispatch The corresponding autogenerated dispatch function
 317  *                      rpc_<name>_dispatch.
 318  *
 319  * @param[in]  serversupplied_info The server supplied authentication function.
 320  *
 321  * @param[out] presult  A pointer to store the connected rpc client pipe.
 322  *
 323  * @return              NT_STATUS_OK on success, a corresponding NT status if an
 324  *                      error occured.
 325  *
 326  * @code
 327  *   struct rpc_pipe_client *winreg_pipe;
 328  *   NTSTATUS status;
 329  *
 330  *   status = rpc_pipe_open_internal(tmp_ctx,
 331  *                                   &ndr_table_winreg.syntax_id,
 332  *                                   rpc_winreg_dispatch,
 333  *                                   p->server_info,
 334  *                                   &winreg_pipe);
 335  * @endcode
 336  */
 337 NTSTATUS rpc_pipe_open_internal(TALLOC_CTX *mem_ctx,
 338                                 const struct ndr_syntax_id *abstract_syntax,
 339                                 struct auth_serversupplied_info *serversupplied_info,
 340                                 struct rpc_pipe_client **presult)
 341 {
 342         struct rpc_pipe_client *result;
 343
 344         result = TALLOC_ZERO_P(mem_ctx, struct rpc_pipe_client);
 345         if (result == NULL) {
 346                 return NT_STATUS_NO_MEMORY;
 347         }
 348
 349         result->abstract_syntax = *abstract_syntax;
 350         result->transfer_syntax = ndr_transfer_syntax;
 351         result->dispatch = rpc_pipe_internal_dispatch;
 352
 353         result->pipes_struct = make_internal_rpc_pipe_p(
 354                 result, abstract_syntax, "", serversupplied_info);
 355         if (result->pipes_struct == NULL) {
 356                 TALLOC_FREE(result);
 357                 return NT_STATUS_NO_MEMORY;
 358         }
 359
 360         result->max_xmit_frag = -1;
 361         result->max_recv_frag = -1;
 362
 363         *presult = result;
 364         return NT_STATUS_OK;
 365 }