source4/librpc/rpc/dcerpc_sock.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    dcerpc over standard sockets transport
   5
   6    Copyright (C) Andrew Tridgell 2003
   7    Copyright (C) Jelmer Vernooij 2004
   8    Copyright (C) Rafal Szczesniak 2006
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "system/filesys.h"
  26 #include "lib/events/events.h"
  27 #include "lib/socket/socket.h"
  28 #include "lib/tsocket/tsocket.h"
  29 #include "libcli/composite/composite.h"
  30 #include "librpc/rpc/dcerpc.h"
  31 #include "librpc/rpc/dcerpc_proto.h"
  32 #include "libcli/resolve/resolve.h"
  33 #include "librpc/rpc/rpc_common.h"
  34
  35 struct pipe_open_socket_state {
  36         struct dcecli_connection *conn;
  37         struct socket_context *socket_ctx;
  38         struct socket_address *localaddr;
  39         struct socket_address *server;
  40         const char *target_hostname;
  41         enum dcerpc_transport_t transport;
  42         struct socket_address *client;
  43 };
  44
  45
  46 static void continue_socket_connect(struct composite_context *ctx)
  47 {
  48         struct dcecli_connection *conn;
  49         struct composite_context *c = talloc_get_type_abort(
  50                 ctx->async.private_data, struct composite_context);
  51         struct pipe_open_socket_state *s = talloc_get_type_abort(
  52                 c->private_data, struct pipe_open_socket_state);
  53         int rc;
  54         int sock_fd;
  55
  56         /* make it easier to write a function calls */
  57         conn = s->conn;
  58
  59         c->status = socket_connect_recv(ctx);
  60         if (!NT_STATUS_IS_OK(c->status)) {
  61                 DBG_NOTICE("Failed to connect host %s on port %d - %s\n",
  62                           s->server->addr, s->server->port,
  63                           nt_errstr(c->status));
  64                 composite_error(c, c->status);
  65                 return;
  66         }
  67
  68         s->client = socket_get_my_addr(s->socket_ctx, s);
  69         if (s->client == NULL) {
  70                 TALLOC_FREE(s->socket_ctx);
  71                 composite_error(c, NT_STATUS_NO_MEMORY);
  72                 return;
  73         }
  74         sock_fd = socket_get_fd(s->socket_ctx);
  75         if (sock_fd == -1) {
  76                 TALLOC_FREE(s->socket_ctx);
  77                 composite_error(c, NT_STATUS_INVALID_HANDLE);
  78                 return;
  79         }
  80         socket_set_flags(s->socket_ctx, SOCKET_FLAG_NOCLOSE);
  81         TALLOC_FREE(s->socket_ctx);
  82
  83         /*
  84           fill in the transport methods
  85         */
  86         conn->transport.transport       = s->transport;
  87         conn->transport.private_data    = NULL;
  88
  89         /*
  90          * Windows uses 5840 for ncacn_ip_tcp,
  91          * so we also use it (for every transport which uses bsd sockets)
  92          */
  93         conn->srv_max_xmit_frag = 5840;
  94         conn->srv_max_recv_frag = 5840;
  95
  96         conn->transport.pending_reads = 0;
  97         conn->server_name   = strupper_talloc(conn, s->target_hostname);
  98
  99         rc = tstream_bsd_existing_socket(conn, sock_fd,
 100                                          &conn->transport.stream);
 101         if (rc < 0) {
 102                 close(sock_fd);
 103                 composite_error(c, NT_STATUS_NO_MEMORY);
 104                 return;
 105         }
 106
 107         conn->transport.write_queue =
 108                 tevent_queue_create(conn, "dcerpc sock write queue");
 109         if (conn->transport.write_queue == NULL) {
 110                 TALLOC_FREE(conn->transport.stream);
 111                 composite_error(c, NT_STATUS_NO_MEMORY);
 112                 return;
 113         }
 114
 115         /* ensure we don't get SIGPIPE */
 116         BlockSignals(true, SIGPIPE);
 117
 118         composite_done(c);
 119 }
 120
 121
 122 static struct composite_context *dcerpc_pipe_open_socket_send(TALLOC_CTX *mem_ctx,
 123                                                        struct dcecli_connection *cn,
 124                                                        struct socket_address *localaddr,
 125                                                        struct socket_address *server,
 126                                                        const char *target_hostname,
 127                                                        const char *full_path,
 128                                                        enum dcerpc_transport_t transport)
 129 {
 130         struct composite_context *c;
 131         struct pipe_open_socket_state *s;
 132         struct composite_context *conn_req;
 133
 134         c = composite_create(mem_ctx, cn->event_ctx);
 135         if (c == NULL) return NULL;
 136
 137         s = talloc_zero(c, struct pipe_open_socket_state);
 138         if (composite_nomem(s, c)) return c;
 139         c->private_data = s;
 140
 141         s->conn      = cn;
 142         s->transport = transport;
 143         if (localaddr) {
 144                 s->localaddr = socket_address_copy(s, localaddr);
 145                 if (composite_nomem(s->localaddr, c)) return c;
 146         }
 147         s->server = socket_address_copy(s, server);
 148         if (composite_nomem(s->server, c)) return c;
 149         if (target_hostname) {
 150                 s->target_hostname = talloc_strdup(s, target_hostname);
 151                 if (composite_nomem(s->target_hostname, c)) return c;
 152         }
 153
 154         c->status = socket_create(s, server->family, SOCKET_TYPE_STREAM,
 155                                   &s->socket_ctx, 0);
 156         if (!composite_is_ok(c)) return c;
 157
 158         conn_req = socket_connect_send(s->socket_ctx, s->localaddr, s->server, 0,
 159                                        c->event_ctx);
 160         composite_continue(c, conn_req, continue_socket_connect, c);
 161         return c;
 162 }
 163
 164 static NTSTATUS dcerpc_pipe_open_socket_recv(struct composite_context *c,
 165                                              TALLOC_CTX *mem_ctx,
 166                                              struct socket_address **localaddr)
 167 {
 168         NTSTATUS status = composite_wait(c);
 169
 170         if (NT_STATUS_IS_OK(status)) {
 171                 struct pipe_open_socket_state *s =
 172                         talloc_get_type_abort(c->private_data,
 173                         struct pipe_open_socket_state);
 174
 175                 if (localaddr != NULL) {
 176                         *localaddr = talloc_move(mem_ctx, &s->client);
 177                 }
 178         }
 179
 180         talloc_free(c);
 181         return status;
 182 }
 183
 184 struct pipe_tcp_state {
 185         const char *server;
 186         const char *target_hostname;
 187         const char **addresses;
 188         uint32_t index;
 189         uint32_t port;
 190         struct socket_address *localaddr;
 191         struct socket_address *srvaddr;
 192         struct resolve_context *resolve_ctx;
 193         struct dcecli_connection *conn;
 194         struct nbt_name name;
 195         char *local_address;
 196         char *remote_address;
 197 };
 198
 199
 200 static void continue_ip_open_socket(struct composite_context *ctx);
 201 static void continue_ip_resolve_name(struct composite_context *ctx);
 202
 203 static void continue_ip_resolve_name(struct composite_context *ctx)
 204 {
 205         struct composite_context *c = talloc_get_type_abort(
 206                 ctx->async.private_data, struct composite_context);
 207         struct pipe_tcp_state *s = talloc_get_type_abort(
 208                 c->private_data, struct pipe_tcp_state);
 209         struct composite_context *sock_ip_req;
 210
 211         c->status = resolve_name_multiple_recv(ctx, s, &s->addresses);
 212         if (!composite_is_ok(c)) return;
 213
 214         /* prepare server address using host ip:port and transport name */
 215         s->srvaddr = socket_address_from_strings(s->conn, "ip", s->addresses[s->index], s->port);
 216         s->index++;
 217         if (composite_nomem(s->srvaddr, c)) return;
 218
 219         sock_ip_req = dcerpc_pipe_open_socket_send(c, s->conn, s->localaddr,
 220                                                      s->srvaddr, s->target_hostname,
 221                                                      NULL,
 222                                                      NCACN_IP_TCP);
 223         composite_continue(c, sock_ip_req, continue_ip_open_socket, c);
 224 }
 225
 226
 227 /*
 228   Stage 2 of dcerpc_pipe_open_tcp_send: receive result of pipe open request
 229   on IP transport.
 230 */
 231 static void continue_ip_open_socket(struct composite_context *ctx)
 232 {
 233         struct composite_context *c = talloc_get_type_abort(
 234                 ctx->async.private_data, struct composite_context);
 235         struct pipe_tcp_state *s = talloc_get_type_abort(
 236                 c->private_data, struct pipe_tcp_state);
 237         struct socket_address *localaddr = NULL;
 238
 239         /* receive result socket open request */
 240         c->status = dcerpc_pipe_open_socket_recv(ctx, s, &localaddr);
 241         if (!NT_STATUS_IS_OK(c->status)) {
 242                 /* something went wrong... */
 243                 DBG_NOTICE("Failed to connect host %s (%s) on port %d - %s.\n",
 244                           s->addresses[s->index - 1], s->target_hostname,
 245                           s->port, nt_errstr(c->status));
 246                 if (s->addresses[s->index]) {
 247                         struct composite_context *sock_ip_req;
 248                         talloc_free(s->srvaddr);
 249                         /* prepare server address using host ip:port and transport name */
 250                         s->srvaddr = socket_address_from_strings(s->conn, "ip", s->addresses[s->index], s->port);
 251                         s->index++;
 252                         if (composite_nomem(s->srvaddr, c)) return;
 253
 254                         sock_ip_req = dcerpc_pipe_open_socket_send(c, s->conn, s->localaddr,
 255                                                                 s->srvaddr, s->target_hostname,
 256                                                                 NULL,
 257                                                                 NCACN_IP_TCP);
 258                         composite_continue(c, sock_ip_req, continue_ip_open_socket, c);
 259
 260                         return;
 261                 } else {
 262                         composite_error(c, c->status);
 263                         return;
 264                 }
 265         }
 266
 267         s->local_address = talloc_strdup(s, localaddr->addr);
 268         if (composite_nomem(s->local_address, c)) return;
 269         s->remote_address = talloc_strdup(s, s->addresses[s->index - 1]);
 270         if (composite_nomem(s->remote_address, c)) return;
 271
 272         composite_done(c);
 273 }
 274
 275 /*
 276   Send rpc pipe open request to given host:port using
 277   tcp/ip transport
 278 */
 279 struct composite_context* dcerpc_pipe_open_tcp_send(struct dcecli_connection *conn,
 280                                                     const char *localaddr,
 281                                                     const char *server,
 282                                                     const char *target_hostname,
 283                                                     uint32_t port,
 284                                                     struct resolve_context *resolve_ctx)
 285 {
 286         struct composite_context *c;
 287         struct pipe_tcp_state *s;
 288         struct composite_context *resolve_req;
 289
 290         /* composite context allocation and setup */
 291         c = composite_create(conn, conn->event_ctx);
 292         if (c == NULL) return NULL;
 293
 294         s = talloc_zero(c, struct pipe_tcp_state);
 295         if (composite_nomem(s, c)) return c;
 296         c->private_data = s;
 297
 298         /* store input parameters in state structure */
 299         s->server          = talloc_strdup(c, server);
 300         if (composite_nomem(s->server, c)) return c;
 301         if (target_hostname) {
 302                 s->target_hostname = talloc_strdup(c, target_hostname);
 303                 if (composite_nomem(s->target_hostname, c)) return c;
 304         }
 305         s->port            = port;
 306         s->conn            = conn;
 307         s->resolve_ctx     = resolve_ctx;
 308         if (localaddr) {
 309                 s->localaddr = socket_address_from_strings(s, "ip", localaddr, 0);
 310                 /* if there is no localaddr, we pass NULL for
 311                    s->localaddr, which is handled by the socket libraries as
 312                    meaning no local binding address specified */
 313         }
 314
 315         make_nbt_name_server(&s->name, s->server);
 316         resolve_req = resolve_name_send(resolve_ctx, s, &s->name, c->event_ctx);
 317         composite_continue(c, resolve_req, continue_ip_resolve_name, c);
 318         return c;
 319 }
 320
 321 /*
 322   Receive result of pipe open request on tcp/ip
 323 */
 324 NTSTATUS dcerpc_pipe_open_tcp_recv(struct composite_context *c,
 325                                    TALLOC_CTX *mem_ctx,
 326                                    char **localaddr,
 327                                    char **remoteaddr)
 328 {
 329         NTSTATUS status;
 330         status = composite_wait(c);
 331
 332         if (NT_STATUS_IS_OK(status)) {
 333                 struct pipe_tcp_state *s = talloc_get_type_abort(
 334                         c->private_data, struct pipe_tcp_state);
 335
 336                 if (localaddr != NULL) {
 337                         *localaddr = talloc_move(mem_ctx, &s->local_address);
 338                 }
 339                 if (remoteaddr != NULL) {
 340                         *remoteaddr = talloc_move(mem_ctx, &s->remote_address);
 341                 }
 342         }
 343
 344         talloc_free(c);
 345         return status;
 346 }
 347
 348
 349 struct pipe_unix_state {
 350         const char *path;
 351         struct socket_address *srvaddr;
 352         struct dcecli_connection *conn;
 353 };
 354
 355
 356 /*
 357   Stage 2 of dcerpc_pipe_open_unix_stream_send: receive result of pipe open
 358   request on unix socket.
 359 */
 360 static void continue_unix_open_socket(struct composite_context *ctx)
 361 {
 362         struct composite_context *c = talloc_get_type_abort(
 363                 ctx->async.private_data, struct composite_context);
 364
 365         c->status = dcerpc_pipe_open_socket_recv(ctx, NULL, NULL);
 366         if (NT_STATUS_IS_OK(c->status)) {
 367                 composite_done(c);
 368                 return;
 369         }
 370
 371         composite_error(c, c->status);
 372 }
 373
 374
 375 /*
 376   Send pipe open request on unix socket
 377 */
 378 struct composite_context *dcerpc_pipe_open_unix_stream_send(struct dcecli_connection *conn,
 379                                                             const char *path)
 380 {
 381         struct composite_context *c;
 382         struct composite_context *sock_unix_req;
 383         struct pipe_unix_state *s;
 384
 385         /* composite context allocation and setup */
 386         c = composite_create(conn, conn->event_ctx);
 387         if (c == NULL) return NULL;
 388
 389         s = talloc_zero(c, struct pipe_unix_state);
 390         if (composite_nomem(s, c)) return c;
 391         c->private_data = s;
 392
 393         /* store parameters in state structure */
 394         s->path = talloc_strdup(c, path);
 395         if (composite_nomem(s->path, c)) return c;
 396         s->conn = conn;
 397
 398         /* prepare server address using socket path and transport name */
 399         s->srvaddr = socket_address_from_strings(conn, "unix", s->path, 0);
 400         if (composite_nomem(s->srvaddr, c)) return c;
 401
 402         /* send socket open request */
 403         sock_unix_req = dcerpc_pipe_open_socket_send(c, s->conn, NULL,
 404                                                      s->srvaddr, NULL,
 405                                                      s->path,
 406                                                      NCALRPC);
 407         composite_continue(c, sock_unix_req, continue_unix_open_socket, c);
 408         return c;
 409 }
 410
 411
 412 /*
 413   Receive result of pipe open request on unix socket
 414 */
 415 NTSTATUS dcerpc_pipe_open_unix_stream_recv(struct composite_context *c)
 416 {
 417         NTSTATUS status = composite_wait(c);
 418
 419         talloc_free(c);
 420         return status;
 421 }
 422
 423
 424 /*
 425   Stage 2 of dcerpc_pipe_open_pipe_send: receive socket open request
 426 */
 427 static void continue_np_open_socket(struct composite_context *ctx)
 428 {
 429         struct composite_context *c = talloc_get_type_abort(
 430                 ctx->async.private_data, struct composite_context);
 431
 432         c->status = dcerpc_pipe_open_socket_recv(ctx, NULL, NULL);
 433         if (!composite_is_ok(c)) return;
 434
 435         composite_done(c);
 436 }
 437
 438
 439 /*
 440   Send pipe open request on ncalrpc
 441 */
 442 struct composite_context* dcerpc_pipe_open_pipe_send(struct dcecli_connection *conn,
 443                                                      const char *ncalrpc_dir,
 444                                                      const char *identifier)
 445 {
 446         char *canon = NULL;
 447
 448         struct composite_context *c;
 449         struct composite_context *sock_np_req;
 450         struct pipe_unix_state *s;
 451
 452         /* composite context allocation and setup */
 453         c = composite_create(conn, conn->event_ctx);
 454         if (c == NULL) return NULL;
 455
 456         s = talloc_zero(c, struct pipe_unix_state);
 457         if (composite_nomem(s, c)) return c;
 458         c->private_data = s;
 459
 460         /* store parameters in state structure */
 461         canon = talloc_strdup(s, identifier);
 462         if (composite_nomem(canon, c)) return c;
 463         s->conn = conn;
 464
 465         string_replace(canon, '/', '\\');
 466         s->path = talloc_asprintf(canon, "%s/%s", ncalrpc_dir, canon);
 467         if (composite_nomem(s->path, c)) return c;
 468
 469         /* prepare server address using path and transport name */
 470         s->srvaddr = socket_address_from_strings(conn, "unix", s->path, 0);
 471         if (composite_nomem(s->srvaddr, c)) return c;
 472
 473         /* send socket open request */
 474         sock_np_req = dcerpc_pipe_open_socket_send(c, s->conn, NULL, s->srvaddr, NULL, s->path, NCALRPC);
 475         composite_continue(c, sock_np_req, continue_np_open_socket, c);
 476         return c;
 477 }
 478
 479
 480 /*
 481   Receive result of pipe open request on ncalrpc
 482 */
 483 NTSTATUS dcerpc_pipe_open_pipe_recv(struct composite_context *c)
 484 {
 485         NTSTATUS status = composite_wait(c);
 486
 487         talloc_free(c);
 488         return status;
 489 }
 490
 491
 492 /*
 493   Open a rpc pipe on a named pipe - sync version
 494 */
 495 NTSTATUS dcerpc_pipe_open_pipe(struct dcecli_connection *conn, const char *ncalrpc_dir, const char *identifier)
 496 {
 497         struct composite_context *c = dcerpc_pipe_open_pipe_send(conn, ncalrpc_dir, identifier);
 498         return dcerpc_pipe_open_pipe_recv(c);
 499 }