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 pipes_struct *get_first_internal_pipe(void)
  49 {
  50         return InternalPipes;
  51 }
  52
  53 pipes_struct *get_next_internal_pipe(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         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         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         /*
 148          * Initialize the incoming RPC data buffer with one PDU worth of memory.
 149          * We cheat here and say we're marshalling, as we intend to add incoming
 150          * data directly into the prs_struct and we want it to auto grow. We will
 151          * change the type to UNMARSALLING before processing the stream.
 152          */
 153
 154         if(!prs_init(&p->in_data.data, 128, p->mem_ctx, MARSHALL)) {
 155                 DEBUG(0,("open_rpc_pipe_p: malloc fail for in_data struct.\n"));
 156                 close_policy_by_pipe(p);
 157                 TALLOC_FREE(p);
 158                 return NULL;
 159         }
 160
 161         p->server_info = copy_serverinfo(p, server_info);
 162         if (p->server_info == NULL) {
 163                 DEBUG(0, ("open_rpc_pipe_p: copy_serverinfo failed\n"));
 164                 close_policy_by_pipe(p);
 165                 TALLOC_FREE(p);
 166                 return NULL;
 167         }
 168
 169         DLIST_ADD(InternalPipes, p);
 170
 171         strlcpy(p->client_address, client_address, sizeof(p->client_address));
 172
 173         p->endian = RPC_LITTLE_ENDIAN;
 174
 175         p->syntax = *syntax;
 176
 177         DEBUG(4,("Created internal pipe %s (pipes_open=%d)\n",
 178                  get_pipe_name_from_syntax(talloc_tos(), syntax), pipes_open));
 179
 180         talloc_set_destructor(p, close_internal_rpc_pipe_hnd);
 181
 182         return p;
 183 }
 184
 185 /****************************************************************************
 186 ****************************************************************************/
 187
 188 static NTSTATUS internal_ndr_push(TALLOC_CTX *mem_ctx,
 189                                   struct rpc_pipe_client *cli,
 190                                   const struct ndr_interface_table *table,
 191                                   uint32_t opnum,
 192                                   void *r)
 193 {
 194         const struct ndr_interface_call *call;
 195         struct ndr_push *push;
 196         enum ndr_err_code ndr_err;
 197         DATA_BLOB blob;
 198         bool ret;
 199
 200         if (!ndr_syntax_id_equal(&table->syntax_id, &cli->abstract_syntax) ||
 201             (opnum >= table->num_calls)) {
 202                 return NT_STATUS_INVALID_PARAMETER;
 203         }
 204
 205         call = &table->calls[opnum];
 206
 207         if (DEBUGLEVEL >= 10) {
 208                 ndr_print_function_debug(call->ndr_print,
 209                                          call->name, NDR_IN, r);
 210         }
 211
 212         push = ndr_push_init_ctx(mem_ctx);
 213         if (push == NULL) {
 214                 return NT_STATUS_NO_MEMORY;
 215         }
 216
 217         ndr_err = call->ndr_push(push, NDR_IN, r);
 218         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 219                 TALLOC_FREE(push);
 220                 return ndr_map_error2ntstatus(ndr_err);
 221         }
 222
 223         blob = ndr_push_blob(push);
 224         ret = prs_init_data_blob(&cli->pipes_struct->in_data.data, &blob, mem_ctx);
 225         TALLOC_FREE(push);
 226         if (!ret) {
 227                 return NT_STATUS_NO_MEMORY;
 228         }
 229
 230         return NT_STATUS_OK;
 231 }
 232
 233 /****************************************************************************
 234 ****************************************************************************/
 235
 236 static NTSTATUS internal_ndr_pull(TALLOC_CTX *mem_ctx,
 237                                   struct rpc_pipe_client *cli,
 238                                   const struct ndr_interface_table *table,
 239                                   uint32_t opnum,
 240                                   void *r)
 241 {
 242         const struct ndr_interface_call *call;
 243         struct ndr_pull *pull;
 244         enum ndr_err_code ndr_err;
 245
 246         if (!ndr_syntax_id_equal(&table->syntax_id, &cli->abstract_syntax) ||
 247             (opnum >= table->num_calls)) {
 248                 return NT_STATUS_INVALID_PARAMETER;
 249         }
 250
 251         call = &table->calls[opnum];
 252
 253         pull = ndr_pull_init_blob(&cli->pipes_struct->out_data.rdata,
 254                                   mem_ctx);
 255         if (pull == NULL) {
 256                 return NT_STATUS_NO_MEMORY;
 257         }
 258
 259         /* have the ndr parser alloc memory for us */
 260         pull->flags |= LIBNDR_FLAG_REF_ALLOC;
 261         ndr_err = call->ndr_pull(pull, NDR_OUT, r);
 262         TALLOC_FREE(pull);
 263
 264         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 265                 return ndr_map_error2ntstatus(ndr_err);
 266         }
 267
 268         if (DEBUGLEVEL >= 10) {
 269                 ndr_print_function_debug(call->ndr_print,
 270                                          call->name, NDR_OUT, r);
 271         }
 272
 273         return NT_STATUS_OK;
 274 }
 275
 276 /****************************************************************************
 277 ****************************************************************************/
 278
 279 static NTSTATUS rpc_pipe_internal_dispatch(struct rpc_pipe_client *cli,
 280                                            TALLOC_CTX *mem_ctx,
 281                                            const struct ndr_interface_table *table,
 282                                            uint32_t opnum, void *r)
 283 {
 284         NTSTATUS status;
 285         int num_cmds = rpc_srv_get_pipe_num_cmds(&table->syntax_id);
 286         const struct api_struct *cmds = rpc_srv_get_pipe_cmds(&table->syntax_id);
 287         int i;
 288
 289         if (cli->pipes_struct == NULL) {
 290                 return NT_STATUS_INVALID_PARAMETER;
 291         }
 292
 293         /* set opnum */
 294         cli->pipes_struct->opnum = opnum;
 295
 296         for (i = 0; i < num_cmds; i++) {
 297                 if (cmds[i].opnum == opnum && cmds[i].fn != NULL) {
 298                         break;
 299                 }
 300         }
 301
 302         if (i == num_cmds) {
 303                 return NT_STATUS_INVALID_PARAMETER;
 304         }
 305
 306         status = internal_ndr_push(mem_ctx, cli, table, opnum, r);
 307         if (!NT_STATUS_IS_OK(status)) {
 308                 return status;
 309         }
 310
 311         if (!cmds[i].fn(cli->pipes_struct)) {
 312                 return NT_STATUS_UNSUCCESSFUL;
 313         }
 314
 315         status = internal_ndr_pull(mem_ctx, cli, table, opnum, r);
 316         if (!NT_STATUS_IS_OK(status)) {
 317                 return status;
 318         }
 319
 320         prs_mem_free(&cli->pipes_struct->in_data.data);
 321         data_blob_free(&cli->pipes_struct->out_data.rdata);
 322
 323         return NT_STATUS_OK;
 324 }
 325
 326 /**
 327  * @brief Create a new RPC client context which uses a local dispatch function.
 328  *
 329  * @param[in]  mem_ctx  The memory context to use.
 330  *
 331  * @param[in]  abstract_syntax Normally the syntax_id of the autogenerated
 332  *                             ndr_table_<name>.
 333  *
 334  * @param[in]  dispatch The corresponding autogenerated dispatch function
 335  *                      rpc_<name>_dispatch.
 336  *
 337  * @param[in]  serversupplied_info The server supplied authentication function.
 338  *
 339  * @param[out] presult  A pointer to store the connected rpc client pipe.
 340  *
 341  * @return              NT_STATUS_OK on success, a corresponding NT status if an
 342  *                      error occured.
 343  *
 344  * @code
 345  *   struct rpc_pipe_client *winreg_pipe;
 346  *   NTSTATUS status;
 347  *
 348  *   status = rpc_pipe_open_internal(tmp_ctx,
 349  *                                   &ndr_table_winreg.syntax_id,
 350  *                                   rpc_winreg_dispatch,
 351  *                                   p->server_info,
 352  *                                   &winreg_pipe);
 353  * @endcode
 354  */
 355 NTSTATUS rpc_pipe_open_internal(TALLOC_CTX *mem_ctx,
 356                                 const struct ndr_syntax_id *abstract_syntax,
 357                                 struct auth_serversupplied_info *serversupplied_info,
 358                                 struct rpc_pipe_client **presult)
 359 {
 360         struct rpc_pipe_client *result;
 361
 362         result = TALLOC_ZERO_P(mem_ctx, struct rpc_pipe_client);
 363         if (result == NULL) {
 364                 return NT_STATUS_NO_MEMORY;
 365         }
 366
 367         result->abstract_syntax = *abstract_syntax;
 368         result->transfer_syntax = ndr_transfer_syntax;
 369         result->dispatch = rpc_pipe_internal_dispatch;
 370
 371         result->pipes_struct = make_internal_rpc_pipe_p(
 372                 result, abstract_syntax, "", serversupplied_info);
 373         if (result->pipes_struct == NULL) {
 374                 TALLOC_FREE(result);
 375                 return NT_STATUS_NO_MEMORY;
 376         }
 377
 378         result->max_xmit_frag = -1;
 379         result->max_recv_frag = -1;
 380
 381         *presult = result;
 382         return NT_STATUS_OK;
 383 }