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 "lib/events/events.h"
  26 #include "lib/socket/socket.h"
  27 #include "lib/stream/packet.h"
  28 #include "libcli/composite/composite.h"
  29 #include "librpc/rpc/dcerpc.h"
  30 #include "librpc/rpc/dcerpc_proto.h"
  31 #include "libcli/resolve/resolve.h"
  32 #include "librpc/rpc/rpc_common.h"
  33
  34 /* transport private information used by general socket pipe transports */
  35 struct sock_private {
  36         struct tevent_fd *fde;
  37         struct socket_context *sock;
  38         char *server_name;
  39
  40         struct packet_context *packet;
  41         uint32_t pending_reads;
  42
  43         const char *path; /* For ncacn_unix_sock and ncalrpc */
  44 };
  45
  46
  47 /*
  48   mark the socket dead
  49 */
  50 static void sock_dead(struct dcecli_connection *p, NTSTATUS status)
  51 {
  52         struct sock_private *sock = (struct sock_private *)p->transport.private_data;
  53
  54         if (!sock) return;
  55
  56         if (sock->packet) {
  57                 packet_recv_disable(sock->packet);
  58                 packet_set_fde(sock->packet, NULL);
  59                 packet_set_socket(sock->packet, NULL);
  60         }
  61
  62         if (sock->fde) {
  63                 talloc_free(sock->fde);
  64                 sock->fde = NULL;
  65         }
  66
  67         if (sock->sock) {
  68                 talloc_free(sock->sock);
  69                 sock->sock = NULL;
  70         }
  71
  72         if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) {
  73                 status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
  74         }
  75
  76         if (NT_STATUS_EQUAL(NT_STATUS_OK, status)) {
  77                 status = NT_STATUS_END_OF_FILE;
  78         }
  79
  80         if (p->transport.recv_data) {
  81                 p->transport.recv_data(p, NULL, status);
  82         }
  83 }
  84
  85
  86 /*
  87   handle socket recv errors
  88 */
  89 static void sock_error_handler(void *private_data, NTSTATUS status)
  90 {
  91         struct dcecli_connection *p = talloc_get_type(private_data,
  92                                                       struct dcecli_connection);
  93         sock_dead(p, status);
  94 }
  95
  96 /*
  97   check if a blob is a complete packet
  98 */
  99 static NTSTATUS sock_complete_packet(void *private_data, DATA_BLOB blob, size_t *size)
 100 {
 101         if (blob.length < DCERPC_FRAG_LEN_OFFSET+2) {
 102                 return STATUS_MORE_ENTRIES;
 103         }
 104         *size = dcerpc_get_frag_length(&blob);
 105         if (*size > blob.length) {
 106                 return STATUS_MORE_ENTRIES;
 107         }
 108         return NT_STATUS_OK;
 109 }
 110
 111 /*
 112   process recv requests
 113 */
 114 static NTSTATUS sock_process_recv(void *private_data, DATA_BLOB blob)
 115 {
 116         struct dcecli_connection *p = talloc_get_type(private_data,
 117                                                       struct dcecli_connection);
 118         struct sock_private *sock = (struct sock_private *)p->transport.private_data;
 119         sock->pending_reads--;
 120         if (sock->pending_reads == 0) {
 121                 packet_recv_disable(sock->packet);
 122         }
 123         p->transport.recv_data(p, &blob, NT_STATUS_OK);
 124         return NT_STATUS_OK;
 125 }
 126
 127 /*
 128   called when a IO is triggered by the events system
 129 */
 130 static void sock_io_handler(struct tevent_context *ev, struct tevent_fd *fde,
 131                             uint16_t flags, void *private_data)
 132 {
 133         struct dcecli_connection *p = talloc_get_type(private_data,
 134                                                       struct dcecli_connection);
 135         struct sock_private *sock = (struct sock_private *)p->transport.private_data;
 136
 137         if (flags & TEVENT_FD_WRITE) {
 138                 packet_queue_run(sock->packet);
 139                 return;
 140         }
 141
 142         if (sock->sock == NULL) {
 143                 return;
 144         }
 145
 146         if (flags & TEVENT_FD_READ) {
 147                 packet_recv(sock->packet);
 148         }
 149 }
 150
 151 /*
 152    initiate a read request - not needed for dcerpc sockets
 153 */
 154 static NTSTATUS sock_send_read(struct dcecli_connection *p)
 155 {
 156         struct sock_private *sock = (struct sock_private *)p->transport.private_data;
 157         sock->pending_reads++;
 158         if (sock->pending_reads == 1) {
 159                 packet_recv_enable(sock->packet);
 160         }
 161         return NT_STATUS_OK;
 162 }
 163
 164 /*
 165    send an initial pdu in a multi-pdu sequence
 166 */
 167 static NTSTATUS sock_send_request(struct dcecli_connection *p, DATA_BLOB *data,
 168                                   bool trigger_read)
 169 {
 170         struct sock_private *sock = (struct sock_private *)p->transport.private_data;
 171         DATA_BLOB blob;
 172         NTSTATUS status;
 173
 174         if (sock->sock == NULL) {
 175                 return NT_STATUS_CONNECTION_DISCONNECTED;
 176         }
 177
 178         blob = data_blob_talloc(sock->packet, data->data, data->length);
 179         if (blob.data == NULL) {
 180                 return NT_STATUS_NO_MEMORY;
 181         }
 182
 183         status = packet_send(sock->packet, blob);
 184         if (!NT_STATUS_IS_OK(status)) {
 185                 return status;
 186         }
 187
 188         if (trigger_read) {
 189                 sock_send_read(p);
 190         }
 191
 192         return NT_STATUS_OK;
 193 }
 194
 195 /*
 196    shutdown sock pipe connection
 197 */
 198 static NTSTATUS sock_shutdown_pipe(struct dcecli_connection *p, NTSTATUS status)
 199 {
 200         struct sock_private *sock = (struct sock_private *)p->transport.private_data;
 201
 202         if (sock && sock->sock) {
 203                 sock_dead(p, status);
 204         }
 205
 206         return status;
 207 }
 208
 209 /*
 210   return sock server name
 211 */
 212 static const char *sock_peer_name(struct dcecli_connection *p)
 213 {
 214         struct sock_private *sock = talloc_get_type(p->transport.private_data, struct sock_private);
 215         return sock->server_name;
 216 }
 217
 218 /*
 219   return remote name we make the actual connection (good for kerberos)
 220 */
 221 static const char *sock_target_hostname(struct dcecli_connection *p)
 222 {
 223         struct sock_private *sock = talloc_get_type(p->transport.private_data, struct sock_private);
 224         return sock->server_name;
 225 }
 226
 227
 228 struct pipe_open_socket_state {
 229         struct dcecli_connection *conn;
 230         struct socket_context *socket_ctx;
 231         struct sock_private *sock;
 232         struct socket_address *localaddr;
 233         struct socket_address *server;
 234         const char *target_hostname;
 235         enum dcerpc_transport_t transport;
 236 };
 237
 238
 239 static void continue_socket_connect(struct composite_context *ctx)
 240 {
 241         struct dcecli_connection *conn;
 242         struct sock_private *sock;
 243         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 244                                                       struct composite_context);
 245         struct pipe_open_socket_state *s = talloc_get_type(c->private_data,
 246                                                            struct pipe_open_socket_state);
 247
 248         /* make it easier to write a function calls */
 249         conn = s->conn;
 250         sock = s->sock;
 251
 252         c->status = socket_connect_recv(ctx);
 253         if (!NT_STATUS_IS_OK(c->status)) {
 254                 DEBUG(0, ("Failed to connect host %s on port %d - %s\n",
 255                           s->server->addr, s->server->port,
 256                           nt_errstr(c->status)));
 257                 composite_error(c, c->status);
 258                 return;
 259         }
 260
 261         /*
 262           fill in the transport methods
 263         */
 264         conn->transport.transport       = s->transport;
 265         conn->transport.private_data    = NULL;
 266
 267         conn->transport.send_request    = sock_send_request;
 268         conn->transport.send_read       = sock_send_read;
 269         conn->transport.recv_data       = NULL;
 270
 271         conn->transport.shutdown_pipe   = sock_shutdown_pipe;
 272         conn->transport.peer_name       = sock_peer_name;
 273         conn->transport.target_hostname = sock_target_hostname;
 274
 275         sock->sock          = s->socket_ctx;
 276         sock->pending_reads = 0;
 277         sock->server_name   = strupper_talloc(sock, s->target_hostname);
 278
 279         sock->fde = tevent_add_fd(conn->event_ctx, sock->sock, socket_get_fd(sock->sock),
 280                                  TEVENT_FD_READ, sock_io_handler, conn);
 281
 282         conn->transport.private_data = sock;
 283
 284         sock->packet = packet_init(sock);
 285         if (sock->packet == NULL) {
 286                 composite_error(c, NT_STATUS_NO_MEMORY);
 287                 talloc_free(sock);
 288                 return;
 289         }
 290
 291         packet_set_private(sock->packet, conn);
 292         packet_set_socket(sock->packet, sock->sock);
 293         packet_set_callback(sock->packet, sock_process_recv);
 294         packet_set_full_request(sock->packet, sock_complete_packet);
 295         packet_set_error_handler(sock->packet, sock_error_handler);
 296         packet_set_event_context(sock->packet, conn->event_ctx);
 297         packet_set_fde(sock->packet, sock->fde);
 298         packet_set_serialise(sock->packet);
 299         packet_set_initial_read(sock->packet, 16);
 300
 301         /* ensure we don't get SIGPIPE */
 302         BlockSignals(true, SIGPIPE);
 303
 304         composite_done(c);
 305 }
 306
 307
 308 static struct composite_context *dcerpc_pipe_open_socket_send(TALLOC_CTX *mem_ctx,
 309                                                        struct dcecli_connection *cn,
 310                                                        struct socket_address *localaddr,
 311                                                        struct socket_address *server,
 312                                                        const char *target_hostname,
 313                                                        const char *full_path,
 314                                                        enum dcerpc_transport_t transport)
 315 {
 316         struct composite_context *c;
 317         struct pipe_open_socket_state *s;
 318         struct composite_context *conn_req;
 319
 320         c = composite_create(mem_ctx, cn->event_ctx);
 321         if (c == NULL) return NULL;
 322
 323         s = talloc_zero(c, struct pipe_open_socket_state);
 324         if (composite_nomem(s, c)) return c;
 325         c->private_data = s;
 326
 327         s->conn      = cn;
 328         s->transport = transport;
 329         if (localaddr) {
 330                 s->localaddr = talloc_reference(c, localaddr);
 331                 if (composite_nomem(s->localaddr, c)) return c;
 332         }
 333         s->server    = talloc_reference(c, server);
 334         if (composite_nomem(s->server, c)) return c;
 335         s->target_hostname = talloc_reference(s, target_hostname);
 336
 337         s->sock = talloc(cn, struct sock_private);
 338         if (composite_nomem(s->sock, c)) return c;
 339
 340         c->status = socket_create(server->family, SOCKET_TYPE_STREAM, &s->socket_ctx, 0);
 341         if (!composite_is_ok(c)) return c;
 342
 343         talloc_steal(s->sock, s->socket_ctx);
 344
 345         s->sock->path = talloc_reference(s->sock, full_path);
 346
 347         conn_req = socket_connect_send(s->socket_ctx, s->localaddr, s->server, 0,
 348                                        c->event_ctx);
 349         composite_continue(c, conn_req, continue_socket_connect, c);
 350         return c;
 351 }
 352
 353
 354 static NTSTATUS dcerpc_pipe_open_socket_recv(struct composite_context *c)
 355 {
 356         NTSTATUS status = composite_wait(c);
 357
 358         talloc_free(c);
 359         return status;
 360 }
 361
 362 struct pipe_tcp_state {
 363         const char *server;
 364         const char *target_hostname;
 365         const char *address;
 366         uint32_t port;
 367         struct socket_address *localaddr;
 368         struct socket_address *srvaddr;
 369         struct resolve_context *resolve_ctx;
 370         struct dcecli_connection *conn;
 371 };
 372
 373
 374 static void continue_ip_open_socket(struct composite_context *ctx);
 375 static void continue_ip_resolve_name(struct composite_context *ctx);
 376
 377 static void continue_ip_resolve_name(struct composite_context *ctx)
 378 {
 379         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 380                                                       struct composite_context);
 381         struct pipe_tcp_state *s = talloc_get_type(c->private_data,
 382                                                    struct pipe_tcp_state);
 383         struct composite_context *sock_ip_req;
 384
 385         c->status = resolve_name_recv(ctx, s, &s->address);
 386         if (!composite_is_ok(c)) return;
 387
 388         /* prepare server address using host ip:port and transport name */
 389         s->srvaddr = socket_address_from_strings(s->conn, "ip", s->address, s->port);
 390         if (composite_nomem(s->srvaddr, c)) return;
 391
 392         sock_ip_req = dcerpc_pipe_open_socket_send(c, s->conn, s->localaddr,
 393                                                      s->srvaddr, s->target_hostname,
 394                                                      NULL,
 395                                                      NCACN_IP_TCP);
 396         composite_continue(c, sock_ip_req, continue_ip_open_socket, c);
 397 }
 398
 399
 400 /*
 401   Stage 2 of dcerpc_pipe_open_tcp_send: receive result of pipe open request
 402   on IP transport.
 403 */
 404 static void continue_ip_open_socket(struct composite_context *ctx)
 405 {
 406         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 407                                                       struct composite_context);
 408         struct pipe_tcp_state *s = talloc_get_type(c->private_data,
 409                                                    struct pipe_tcp_state);
 410
 411         /* receive result socket open request */
 412         c->status = dcerpc_pipe_open_socket_recv(ctx);
 413         if (!NT_STATUS_IS_OK(c->status)) {
 414                 /* something went wrong... */
 415                 DEBUG(0, ("Failed to connect host %s (%s) on port %d - %s.\n",
 416                           s->address, s->target_hostname,
 417                           s->port, nt_errstr(c->status)));
 418
 419                 composite_error(c, c->status);
 420                 return;
 421         }
 422
 423         composite_done(c);
 424 }
 425
 426 /*
 427   Send rpc pipe open request to given host:port using
 428   tcp/ip transport
 429 */
 430 struct composite_context* dcerpc_pipe_open_tcp_send(struct dcecli_connection *conn,
 431                                                     const char *localaddr,
 432                                                     const char *server,
 433                                                     const char *target_hostname,
 434                                                     uint32_t port,
 435                                                     struct resolve_context *resolve_ctx)
 436 {
 437         struct composite_context *c;
 438         struct pipe_tcp_state *s;
 439         struct composite_context *resolve_req;
 440         struct nbt_name name;
 441
 442         /* composite context allocation and setup */
 443         c = composite_create(conn, conn->event_ctx);
 444         if (c == NULL) return NULL;
 445
 446         s = talloc_zero(c, struct pipe_tcp_state);
 447         if (composite_nomem(s, c)) return c;
 448         c->private_data = s;
 449
 450         /* store input parameters in state structure */
 451         s->server          = talloc_strdup(c, server);
 452         if (composite_nomem(s->server, c)) return c;
 453         if (target_hostname) {
 454                 s->target_hostname = talloc_strdup(c, target_hostname);
 455                 if (composite_nomem(s->target_hostname, c)) return c;
 456         }
 457         s->port            = port;
 458         s->conn            = conn;
 459         s->resolve_ctx     = resolve_ctx;
 460         if (localaddr) {
 461                 s->localaddr = socket_address_from_strings(s, "ip", localaddr, 0);
 462                 /* if there is no localaddr, we pass NULL for
 463                    s->localaddr, which is handled by the socket libraries as
 464                    meaning no local binding address specified */
 465         }
 466
 467         make_nbt_name_server(&name, server);
 468         resolve_req = resolve_name_send(resolve_ctx, s, &name, c->event_ctx);
 469         composite_continue(c, resolve_req, continue_ip_resolve_name, c);
 470         return c;
 471 }
 472
 473 /*
 474   Receive result of pipe open request on tcp/ip
 475 */
 476 NTSTATUS dcerpc_pipe_open_tcp_recv(struct composite_context *c)
 477 {
 478         NTSTATUS status;
 479         status = composite_wait(c);
 480
 481         talloc_free(c);
 482         return status;
 483 }
 484
 485
 486 struct pipe_unix_state {
 487         const char *path;
 488         struct socket_address *srvaddr;
 489         struct dcecli_connection *conn;
 490 };
 491
 492
 493 /*
 494   Stage 2 of dcerpc_pipe_open_unix_stream_send: receive result of pipe open
 495   request on unix socket.
 496 */
 497 static void continue_unix_open_socket(struct composite_context *ctx)
 498 {
 499         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 500                                                       struct composite_context);
 501
 502         c->status = dcerpc_pipe_open_socket_recv(ctx);
 503         if (NT_STATUS_IS_OK(c->status)) {
 504                 composite_done(c);
 505                 return;
 506         }
 507
 508         composite_error(c, c->status);
 509 }
 510
 511
 512 /*
 513   Send pipe open request on unix socket
 514 */
 515 struct composite_context *dcerpc_pipe_open_unix_stream_send(struct dcecli_connection *conn,
 516                                                             const char *path)
 517 {
 518         struct composite_context *c;
 519         struct composite_context *sock_unix_req;
 520         struct pipe_unix_state *s;
 521
 522         /* composite context allocation and setup */
 523         c = composite_create(conn, conn->event_ctx);
 524         if (c == NULL) return NULL;
 525
 526         s = talloc_zero(c, struct pipe_unix_state);
 527         if (composite_nomem(s, c)) return c;
 528         c->private_data = s;
 529
 530         /* store parameters in state structure */
 531         s->path = talloc_strdup(c, path);
 532         if (composite_nomem(s->path, c)) return c;
 533         s->conn = conn;
 534
 535         /* prepare server address using socket path and transport name */
 536         s->srvaddr = socket_address_from_strings(conn, "unix", s->path, 0);
 537         if (composite_nomem(s->srvaddr, c)) return c;
 538
 539         /* send socket open request */
 540         sock_unix_req = dcerpc_pipe_open_socket_send(c, s->conn, NULL,
 541                                                      s->srvaddr, NULL,
 542                                                      s->path,
 543                                                      NCALRPC);
 544         composite_continue(c, sock_unix_req, continue_unix_open_socket, c);
 545         return c;
 546 }
 547
 548
 549 /*
 550   Receive result of pipe open request on unix socket
 551 */
 552 NTSTATUS dcerpc_pipe_open_unix_stream_recv(struct composite_context *c)
 553 {
 554         NTSTATUS status = composite_wait(c);
 555
 556         talloc_free(c);
 557         return status;
 558 }
 559
 560
 561 /*
 562   Stage 2 of dcerpc_pipe_open_pipe_send: receive socket open request
 563 */
 564 static void continue_np_open_socket(struct composite_context *ctx)
 565 {
 566         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 567                                                       struct composite_context);
 568
 569         c->status = dcerpc_pipe_open_socket_recv(ctx);
 570         if (!composite_is_ok(c)) return;
 571
 572         composite_done(c);
 573 }
 574
 575
 576 /*
 577   Send pipe open request on ncalrpc
 578 */
 579 struct composite_context* dcerpc_pipe_open_pipe_send(struct dcecli_connection *conn,
 580                                                      const char *ncalrpc_dir,
 581                                                      const char *identifier)
 582 {
 583         char *canon = NULL;
 584
 585         struct composite_context *c;
 586         struct composite_context *sock_np_req;
 587         struct pipe_unix_state *s;
 588
 589         /* composite context allocation and setup */
 590         c = composite_create(conn, conn->event_ctx);
 591         if (c == NULL) return NULL;
 592
 593         s = talloc_zero(c, struct pipe_unix_state);
 594         if (composite_nomem(s, c)) return c;
 595         c->private_data = s;
 596
 597         /* store parameters in state structure */
 598         canon = talloc_strdup(s, identifier);
 599         if (composite_nomem(canon, c)) return c;
 600         s->conn = conn;
 601
 602         string_replace(canon, '/', '\\');
 603         s->path = talloc_asprintf(canon, "%s/%s", ncalrpc_dir, canon);
 604         if (composite_nomem(s->path, c)) return c;
 605
 606         /* prepare server address using path and transport name */
 607         s->srvaddr = socket_address_from_strings(conn, "unix", s->path, 0);
 608         if (composite_nomem(s->srvaddr, c)) return c;
 609
 610         /* send socket open request */
 611         sock_np_req = dcerpc_pipe_open_socket_send(c, s->conn, NULL, s->srvaddr, NULL, s->path, NCALRPC);
 612         composite_continue(c, sock_np_req, continue_np_open_socket, c);
 613         return c;
 614 }
 615
 616
 617 /*
 618   Receive result of pipe open request on ncalrpc
 619 */
 620 NTSTATUS dcerpc_pipe_open_pipe_recv(struct composite_context *c)
 621 {
 622         NTSTATUS status = composite_wait(c);
 623
 624         talloc_free(c);
 625         return status;
 626 }
 627
 628
 629 /*
 630   Open a rpc pipe on a named pipe - sync version
 631 */
 632 NTSTATUS dcerpc_pipe_open_pipe(struct dcecli_connection *conn, const char *ncalrpc_dir, const char *identifier)
 633 {
 634         struct composite_context *c = dcerpc_pipe_open_pipe_send(conn, ncalrpc_dir, identifier);
 635         return dcerpc_pipe_open_pipe_recv(c);
 636 }
 637
 638 const char *dcerpc_unix_socket_path(struct dcecli_connection *p)
 639 {
 640         struct sock_private *sock = (struct sock_private *)p->transport.private_data;
 641         return sock->path;
 642 }
 643
 644 struct socket_address *dcerpc_socket_peer_addr(struct dcecli_connection *p, TALLOC_CTX *mem_ctx)
 645 {
 646         struct sock_private *sock = (struct sock_private *)p->transport.private_data;
 647         return socket_get_peer_addr(sock->sock, mem_ctx);
 648 }
 649