source3/rpc_server/rpc_server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Generic infrstructure for RPC Daemons
   4    Copyright (C) Simo Sorce 2010
   5    Copyright (C) Andrew Bartlett 2011
   6    Copyright (C) Andreas Schneider 2011
   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/rpc_pipes.h"
  24 #include "rpc_server/rpc_server.h"
  25 #include "rpc_server/rpc_config.h"
  26 #include "rpc_dce.h"
  27 #include "librpc/gen_ndr/netlogon.h"
  28 #include "librpc/gen_ndr/auth.h"
  29 #include "lib/tsocket/tsocket.h"
  30 #include "libcli/named_pipe_auth/npa_tstream.h"
  31 #include "../auth/auth_sam_reply.h"
  32 #include "auth.h"
  33 #include "rpc_server/rpc_ncacn_np.h"
  34 #include "rpc_server/srv_pipe_hnd.h"
  35 #include "rpc_server/srv_pipe.h"
  36
  37 #define SERVER_TCP_LOW_PORT  1024
  38 #define SERVER_TCP_HIGH_PORT 1300
  39
  40 static NTSTATUS auth_anonymous_session_info(TALLOC_CTX *mem_ctx,
  41                                             struct auth_session_info **session_info)
  42 {
  43         NTSTATUS status;
  44
  45         status = make_session_info_guest(mem_ctx, session_info);
  46         if (!NT_STATUS_IS_OK(status)) {
  47                 return status;
  48         }
  49
  50         return NT_STATUS_OK;
  51 }
  52
  53 /* Creates a pipes_struct and initializes it with the information
  54  * sent from the client */
  55 static int make_server_pipes_struct(TALLOC_CTX *mem_ctx,
  56                                     struct messaging_context *msg_ctx,
  57                                     const char *pipe_name,
  58                                     enum dcerpc_transport_t transport,
  59                                     bool ncalrpc_as_system,
  60                                     const struct tsocket_address *local_address,
  61                                     const struct tsocket_address *remote_address,
  62                                     struct auth_session_info *session_info,
  63                                     struct pipes_struct **_p,
  64                                     int *perrno)
  65 {
  66         struct pipes_struct *p;
  67         int ret;
  68
  69         ret = make_base_pipes_struct(mem_ctx, msg_ctx, pipe_name,
  70                                      transport, RPC_LITTLE_ENDIAN,
  71                                      ncalrpc_as_system,
  72                                      remote_address, local_address, &p);
  73         if (ret) {
  74                 *perrno = ret;
  75                 return -1;
  76         }
  77
  78         if (session_info->unix_token && session_info->unix_info && session_info->security_token) {
  79                 /* Don't call create_local_token(), we already have the full details here */
  80                 p->session_info = talloc_steal(p, session_info);
  81
  82         } else {
  83                 DEBUG(0, ("Supplied session_info in make_server_pipes_struct was incomplete!"));
  84                 *perrno = EINVAL;
  85                 return -1;
  86         }
  87
  88         *_p = p;
  89         return 0;
  90 }
  91
  92 /* Start listening on the appropriate unix socket and setup all is needed to
  93  * dispatch requests to the pipes rpc implementation */
  94
  95 struct dcerpc_ncacn_listen_state {
  96         struct ndr_syntax_id syntax_id;
  97
  98         int fd;
  99         union {
 100                 char *name;
 101                 uint16_t port;
 102         } ep;
 103
 104         struct tevent_context *ev_ctx;
 105         struct messaging_context *msg_ctx;
 106         dcerpc_ncacn_disconnect_fn disconnect_fn;
 107 };
 108
 109 static void named_pipe_listener(struct tevent_context *ev,
 110                                 struct tevent_fd *fde,
 111                                 uint16_t flags,
 112                                 void *private_data);
 113
 114 int create_named_pipe_socket(const char *pipe_name)
 115 {
 116         char *np_dir = NULL;
 117         int fd = -1;
 118
 119         /*
 120          * As lp_ncalrpc_dir() should have 0755, but
 121          * lp_ncalrpc_dir()/np should have 0700, we need to
 122          * create lp_ncalrpc_dir() first.
 123          */
 124         if (!directory_create_or_exist(lp_ncalrpc_dir(), geteuid(), 0755)) {
 125                 DEBUG(0, ("Failed to create pipe directory %s - %s\n",
 126                           lp_ncalrpc_dir(), strerror(errno)));
 127                 goto out;
 128         }
 129
 130         np_dir = talloc_asprintf(talloc_tos(), "%s/np", lp_ncalrpc_dir());
 131         if (!np_dir) {
 132                 DEBUG(0, ("Out of memory\n"));
 133                 goto out;
 134         }
 135
 136         if (!directory_create_or_exist_strict(np_dir, geteuid(), 0700)) {
 137                 DEBUG(0, ("Failed to create pipe directory %s - %s\n",
 138                           np_dir, strerror(errno)));
 139                 goto out;
 140         }
 141
 142         fd = create_pipe_sock(np_dir, pipe_name, 0700);
 143         if (fd == -1) {
 144                 DEBUG(0, ("Failed to create pipe socket! [%s/%s]\n",
 145                           np_dir, pipe_name));
 146                 goto out;
 147         }
 148
 149         DEBUG(10, ("Openened pipe socket fd %d for %s\n", fd, pipe_name));
 150
 151 out:
 152         talloc_free(np_dir);
 153         return fd;
 154 }
 155
 156 bool setup_named_pipe_socket(const char *pipe_name,
 157                              struct tevent_context *ev_ctx,
 158                              struct messaging_context *msg_ctx)
 159 {
 160         struct dcerpc_ncacn_listen_state *state;
 161         struct tevent_fd *fde;
 162         int rc;
 163
 164         state = talloc(ev_ctx, struct dcerpc_ncacn_listen_state);
 165         if (!state) {
 166                 DEBUG(0, ("Out of memory\n"));
 167                 return false;
 168         }
 169         state->ep.name = talloc_strdup(state, pipe_name);
 170         if (state->ep.name == NULL) {
 171                 DEBUG(0, ("Out of memory\n"));
 172                 goto out;
 173         }
 174         state->fd = create_named_pipe_socket(pipe_name);
 175         if (state->fd == -1) {
 176                 goto out;
 177         }
 178
 179         rc = listen(state->fd, 5);
 180         if (rc < 0) {
 181                 DEBUG(0, ("Failed to listen on pipe socket %s: %s\n",
 182                           pipe_name, strerror(errno)));
 183                 goto out;
 184         }
 185
 186         state->ev_ctx = ev_ctx;
 187         state->msg_ctx = msg_ctx;
 188
 189         DEBUG(10, ("Openened pipe socket fd %d for %s\n",
 190                    state->fd, pipe_name));
 191
 192         fde = tevent_add_fd(ev_ctx,
 193                             state, state->fd, TEVENT_FD_READ,
 194                             named_pipe_listener, state);
 195         if (!fde) {
 196                 DEBUG(0, ("Failed to add event handler!\n"));
 197                 goto out;
 198         }
 199
 200         tevent_fd_set_auto_close(fde);
 201         return true;
 202
 203 out:
 204         if (state->fd != -1) {
 205                 close(state->fd);
 206         }
 207         TALLOC_FREE(state);
 208         return false;
 209 }
 210
 211 static void named_pipe_listener(struct tevent_context *ev,
 212                                 struct tevent_fd *fde,
 213                                 uint16_t flags,
 214                                 void *private_data)
 215 {
 216         struct dcerpc_ncacn_listen_state *state =
 217                         talloc_get_type_abort(private_data,
 218                                               struct dcerpc_ncacn_listen_state);
 219         struct sockaddr_un sunaddr;
 220         socklen_t len;
 221         int sd = -1;
 222
 223         /* TODO: should we have a limit to the number of clients ? */
 224
 225         len = sizeof(sunaddr);
 226
 227         sd = accept(state->fd,
 228                     (struct sockaddr *)(void *)&sunaddr, &len);
 229
 230         if (sd == -1) {
 231                 if (errno != EINTR) {
 232                         DEBUG(6, ("Failed to get a valid socket [%s]\n",
 233                                   strerror(errno)));
 234                 }
 235                 return;
 236         }
 237
 238         DEBUG(6, ("Accepted socket %d\n", sd));
 239
 240         named_pipe_accept_function(state->ev_ctx,
 241                                    state->msg_ctx,
 242                                    state->ep.name,
 243                                    sd, NULL, 0);
 244 }
 245
 246
 247 /* This is the core of the rpc server.
 248  * Accepts connections from clients and process requests using the appropriate
 249  * dispatcher table. */
 250
 251 struct named_pipe_client {
 252         const char *pipe_name;
 253
 254         struct tevent_context *ev;
 255         struct messaging_context *msg_ctx;
 256
 257         uint16_t file_type;
 258         uint16_t device_state;
 259         uint64_t allocation_size;
 260
 261         struct tstream_context *tstream;
 262
 263         struct tsocket_address *client;
 264         char *client_name;
 265         struct tsocket_address *server;
 266         char *server_name;
 267
 268         struct auth_session_info *session_info;
 269
 270         struct pipes_struct *p;
 271
 272         struct tevent_queue *write_queue;
 273
 274         struct iovec *iov;
 275         size_t count;
 276
 277         named_pipe_termination_fn *term_fn;
 278         void *private_data;
 279 };
 280
 281 static int named_pipe_destructor(struct named_pipe_client *npc)
 282 {
 283         if (npc->term_fn) {
 284                 npc->term_fn(npc->private_data);
 285         }
 286         return 0;
 287 }
 288
 289 static void named_pipe_accept_done(struct tevent_req *subreq);
 290
 291 void named_pipe_accept_function(struct tevent_context *ev_ctx,
 292                                 struct messaging_context *msg_ctx,
 293                                 const char *pipe_name, int fd,
 294                                 named_pipe_termination_fn *term_fn,
 295                                 void *private_data)
 296 {
 297         struct named_pipe_client *npc;
 298         struct tstream_context *plain;
 299         struct tevent_req *subreq;
 300         int ret;
 301
 302         npc = talloc_zero(ev_ctx, struct named_pipe_client);
 303         if (!npc) {
 304                 DEBUG(0, ("Out of memory!\n"));
 305                 close(fd);
 306                 return;
 307         }
 308
 309         npc->pipe_name = talloc_strdup(npc, pipe_name);
 310         if (npc->pipe_name == NULL) {
 311                 DEBUG(0, ("Out of memory!\n"));
 312                 TALLOC_FREE(npc);
 313                 close(fd);
 314                 return;
 315         }
 316         npc->ev = ev_ctx;
 317         npc->msg_ctx = msg_ctx;
 318         npc->term_fn = term_fn;
 319         npc->private_data = private_data;
 320
 321         talloc_set_destructor(npc, named_pipe_destructor);
 322
 323         /* make sure socket is in NON blocking state */
 324         ret = set_blocking(fd, false);
 325         if (ret != 0) {
 326                 DEBUG(2, ("Failed to make socket non-blocking\n"));
 327                 TALLOC_FREE(npc);
 328                 close(fd);
 329                 return;
 330         }
 331
 332         ret = tstream_bsd_existing_socket(npc, fd, &plain);
 333         if (ret != 0) {
 334                 DEBUG(2, ("Failed to create tstream socket\n"));
 335                 TALLOC_FREE(npc);
 336                 close(fd);
 337                 return;
 338         }
 339
 340         npc->file_type = FILE_TYPE_MESSAGE_MODE_PIPE;
 341         npc->device_state = 0xff | 0x0400 | 0x0100;
 342         npc->allocation_size = 4096;
 343
 344         subreq = tstream_npa_accept_existing_send(npc, npc->ev, plain,
 345                                                   npc->file_type,
 346                                                   npc->device_state,
 347                                                   npc->allocation_size);
 348         if (!subreq) {
 349                 DEBUG(2, ("Failed to start async accept procedure\n"));
 350                 TALLOC_FREE(npc);
 351                 close(fd);
 352                 return;
 353         }
 354         tevent_req_set_callback(subreq, named_pipe_accept_done, npc);
 355 }
 356
 357 static void named_pipe_packet_process(struct tevent_req *subreq);
 358 static void named_pipe_packet_done(struct tevent_req *subreq);
 359
 360 static void named_pipe_accept_done(struct tevent_req *subreq)
 361 {
 362         struct auth_session_info_transport *session_info_transport;
 363         struct named_pipe_client *npc =
 364                 tevent_req_callback_data(subreq, struct named_pipe_client);
 365         int error;
 366         int ret;
 367
 368         ret = tstream_npa_accept_existing_recv(subreq, &error, npc,
 369                                                 &npc->tstream,
 370                                                 &npc->client,
 371                                                 &npc->client_name,
 372                                                 &npc->server,
 373                                                 &npc->server_name,
 374                                                 &session_info_transport);
 375
 376         npc->session_info = talloc_move(npc, &session_info_transport->session_info);
 377
 378         TALLOC_FREE(subreq);
 379         if (ret != 0) {
 380                 DEBUG(2, ("Failed to accept named pipe connection! (%s)\n",
 381                           strerror(error)));
 382                 TALLOC_FREE(npc);
 383                 return;
 384         }
 385
 386         ret = make_server_pipes_struct(npc,
 387                                        npc->msg_ctx,
 388                                        npc->pipe_name, NCACN_NP,
 389                                         false, npc->server, npc->client, npc->session_info,
 390                                         &npc->p, &error);
 391         if (ret != 0) {
 392                 DEBUG(2, ("Failed to create pipes_struct! (%s)\n",
 393                           strerror(error)));
 394                 goto fail;
 395         }
 396
 397         npc->write_queue = tevent_queue_create(npc, "np_server_write_queue");
 398         if (!npc->write_queue) {
 399                 DEBUG(2, ("Failed to set up write queue!\n"));
 400                 goto fail;
 401         }
 402
 403         /* And now start receiving and processing packets */
 404         subreq = dcerpc_read_ncacn_packet_send(npc, npc->ev, npc->tstream);
 405         if (!subreq) {
 406                 DEBUG(2, ("Failed to start receving packets\n"));
 407                 goto fail;
 408         }
 409         tevent_req_set_callback(subreq, named_pipe_packet_process, npc);
 410         return;
 411
 412 fail:
 413         DEBUG(2, ("Fatal error. Terminating client(%s) connection!\n",
 414                   npc->client_name));
 415         /* terminate client connection */
 416         talloc_free(npc);
 417         return;
 418 }
 419
 420 static void named_pipe_packet_process(struct tevent_req *subreq)
 421 {
 422         struct named_pipe_client *npc =
 423                 tevent_req_callback_data(subreq, struct named_pipe_client);
 424         struct _output_data *out = &npc->p->out_data;
 425         DATA_BLOB recv_buffer = data_blob_null;
 426         struct ncacn_packet *pkt;
 427         NTSTATUS status;
 428         ssize_t data_left;
 429         ssize_t data_used;
 430         char *data;
 431         uint32_t to_send;
 432         size_t i;
 433         bool ok;
 434
 435         status = dcerpc_read_ncacn_packet_recv(subreq, npc, &pkt, &recv_buffer);
 436         TALLOC_FREE(subreq);
 437         if (!NT_STATUS_IS_OK(status)) {
 438                 goto fail;
 439         }
 440
 441         data_left = recv_buffer.length;
 442         data = (char *)recv_buffer.data;
 443
 444         while (data_left) {
 445
 446                 data_used = process_incoming_data(npc->p, data, data_left);
 447                 if (data_used < 0) {
 448                         DEBUG(3, ("Failed to process dceprc request!\n"));
 449                         status = NT_STATUS_UNEXPECTED_IO_ERROR;
 450                         goto fail;
 451                 }
 452
 453                 data_left -= data_used;
 454                 data += data_used;
 455         }
 456
 457         /* Do not leak this buffer, npc is a long lived context */
 458         talloc_free(recv_buffer.data);
 459         talloc_free(pkt);
 460
 461         /* this is needed because of the way DCERPC Binds work in
 462          * the RPC marshalling code */
 463         to_send = out->frag.length - out->current_pdu_sent;
 464         if (to_send > 0) {
 465
 466                 npc->iov = talloc_zero(npc, struct iovec);
 467                 if (!npc->iov) {
 468                         status = NT_STATUS_NO_MEMORY;
 469                         goto fail;
 470                 }
 471                 npc->count = 1;
 472
 473                 npc->iov[0].iov_base = out->frag.data
 474                                         + out->current_pdu_sent;
 475                 npc->iov[0].iov_len = to_send;
 476
 477                 out->current_pdu_sent += to_send;
 478         }
 479
 480         /* this condition is false for bind packets, or when we haven't
 481          * yet got a full request, and need to wait for more data from
 482          * the client */
 483         while (out->data_sent_length < out->rdata.length) {
 484
 485                 ok = create_next_pdu(npc->p);
 486                 if (!ok) {
 487                         DEBUG(3, ("Failed to create next PDU!\n"));
 488                         status = NT_STATUS_UNEXPECTED_IO_ERROR;
 489                         goto fail;
 490                 }
 491
 492                 npc->iov = talloc_realloc(npc, npc->iov,
 493                                             struct iovec, npc->count + 1);
 494                 if (!npc->iov) {
 495                         status = NT_STATUS_NO_MEMORY;
 496                         goto fail;
 497                 }
 498
 499                 npc->iov[npc->count].iov_base = out->frag.data;
 500                 npc->iov[npc->count].iov_len = out->frag.length;
 501
 502                 npc->count++;
 503         }
 504
 505         /* we still don't have a complete request, go back and wait for more
 506          * data */
 507         if (npc->count == 0) {
 508                 /* Wait for the next packet */
 509                 subreq = dcerpc_read_ncacn_packet_send(npc, npc->ev, npc->tstream);
 510                 if (!subreq) {
 511                         DEBUG(2, ("Failed to start receving packets\n"));
 512                         status = NT_STATUS_NO_MEMORY;
 513                         goto fail;
 514                 }
 515                 tevent_req_set_callback(subreq, named_pipe_packet_process, npc);
 516                 return;
 517         }
 518
 519         DEBUG(10, ("Sending %u fragments in a total of %u bytes\n",
 520                    (unsigned int)npc->count,
 521                    (unsigned int)npc->p->out_data.data_sent_length));
 522
 523         for (i = 0; i < npc->count; i++) {
 524                 DEBUG(10, ("Sending PDU number: %d, PDU Length: %u\n",
 525                           (unsigned int)i,
 526                           (unsigned int)npc->iov[i].iov_len));
 527                 dump_data(11, (const uint8_t *)npc->iov[i].iov_base,
 528                                 npc->iov[i].iov_len);
 529
 530                 subreq = tstream_writev_queue_send(npc,
 531                                                    npc->ev,
 532                                                    npc->tstream,
 533                                                    npc->write_queue,
 534                                                    (npc->iov + i),
 535                                                    1);
 536                 if (!subreq) {
 537                         DEBUG(2, ("Failed to send packet\n"));
 538                         status = NT_STATUS_NO_MEMORY;
 539                         goto fail;
 540                 }
 541                 tevent_req_set_callback(subreq, named_pipe_packet_done, npc);
 542         }
 543
 544         return;
 545
 546 fail:
 547         DEBUG(2, ("Fatal error(%s). "
 548                   "Terminating client(%s) connection!\n",
 549                   nt_errstr(status), npc->client_name));
 550         /* terminate client connection */
 551         talloc_free(npc);
 552         return;
 553 }
 554
 555 static void named_pipe_packet_done(struct tevent_req *subreq)
 556 {
 557         struct named_pipe_client *npc =
 558                 tevent_req_callback_data(subreq, struct named_pipe_client);
 559         int sys_errno;
 560         int ret;
 561
 562         ret = tstream_writev_queue_recv(subreq, &sys_errno);
 563         TALLOC_FREE(subreq);
 564         if (ret == -1) {
 565                 DEBUG(2, ("Writev failed!\n"));
 566                 goto fail;
 567         }
 568
 569         if (tevent_queue_length(npc->write_queue) > 0) {
 570                 return;
 571         }
 572
 573         /* clear out any data that may have been left around */
 574         npc->count = 0;
 575         TALLOC_FREE(npc->iov);
 576         data_blob_free(&npc->p->in_data.data);
 577         data_blob_free(&npc->p->out_data.frag);
 578         data_blob_free(&npc->p->out_data.rdata);
 579
 580         talloc_free_children(npc->p->mem_ctx);
 581
 582         /* Wait for the next packet */
 583         subreq = dcerpc_read_ncacn_packet_send(npc, npc->ev, npc->tstream);
 584         if (!subreq) {
 585                 DEBUG(2, ("Failed to start receving packets\n"));
 586                 sys_errno = ENOMEM;
 587                 goto fail;
 588         }
 589         tevent_req_set_callback(subreq, named_pipe_packet_process, npc);
 590         return;
 591
 592 fail:
 593         DEBUG(2, ("Fatal error(%s). "
 594                   "Terminating client(%s) connection!\n",
 595                   strerror(sys_errno), npc->client_name));
 596         /* terminate client connection */
 597         talloc_free(npc);
 598         return;
 599 }
 600
 601 /********************************************************************
 602  * Start listening on the tcp/ip socket
 603  ********************************************************************/
 604
 605 static void dcerpc_ncacn_tcpip_listener(struct tevent_context *ev,
 606                                         struct tevent_fd *fde,
 607                                         uint16_t flags,
 608                                         void *private_data);
 609
 610 int create_tcpip_socket(const struct sockaddr_storage *ifss, uint16_t *port)
 611 {
 612         int fd = -1;
 613
 614         if (*port == 0) {
 615                 uint16_t i;
 616
 617                 for (i = SERVER_TCP_LOW_PORT; i <= SERVER_TCP_HIGH_PORT; i++) {
 618                         fd = open_socket_in(SOCK_STREAM,
 619                                             i,
 620                                             0,
 621                                             ifss,
 622                                             false);
 623                         if (fd > 0) {
 624                                 *port = i;
 625                                 break;
 626                         }
 627                 }
 628         } else {
 629                 fd = open_socket_in(SOCK_STREAM,
 630                                     *port,
 631                                     0,
 632                                     ifss,
 633                                     true);
 634         }
 635         if (fd == -1) {
 636                 DEBUG(0, ("Failed to create socket on port %u!\n", *port));
 637                 return -1;
 638         }
 639
 640         DEBUG(10, ("Opened tcpip socket fd %d for port %u\n", fd, *port));
 641
 642         return fd;
 643 }
 644
 645 uint16_t setup_dcerpc_ncacn_tcpip_socket(struct tevent_context *ev_ctx,
 646                                          struct messaging_context *msg_ctx,
 647                                          const struct sockaddr_storage *ifss,
 648                                          uint16_t port)
 649 {
 650         struct dcerpc_ncacn_listen_state *state;
 651         struct tevent_fd *fde;
 652         int rc;
 653
 654         state = talloc(ev_ctx, struct dcerpc_ncacn_listen_state);
 655         if (state == NULL) {
 656                 DEBUG(0, ("setup_dcerpc_ncacn_tcpip_socket: Out of memory\n"));
 657                 return 0;
 658         }
 659
 660         state->fd = -1;
 661         state->ep.port = port;
 662         state->disconnect_fn = NULL;
 663
 664         state->fd = create_tcpip_socket(ifss, &state->ep.port);
 665         if (state->fd == -1) {
 666                 goto out;
 667         }
 668
 669         state->ev_ctx = ev_ctx;
 670         state->msg_ctx = msg_ctx;
 671
 672         /* ready to listen */
 673         set_socket_options(state->fd, "SO_KEEPALIVE");
 674         set_socket_options(state->fd, lp_socket_options());
 675
 676         /* Set server socket to non-blocking for the accept. */
 677         set_blocking(state->fd, false);
 678
 679         rc = listen(state->fd, SMBD_LISTEN_BACKLOG);
 680         if (rc == -1) {
 681                 DEBUG(0,("setup_tcpip_socket: listen - %s\n", strerror(errno)));
 682                 goto out;
 683         }
 684
 685         DEBUG(10, ("setup_tcpip_socket: openened socket fd %d for port %u\n",
 686                    state->fd, state->ep.port));
 687
 688         fde = tevent_add_fd(state->ev_ctx,
 689                             state,
 690                             state->fd,
 691                             TEVENT_FD_READ,
 692                             dcerpc_ncacn_tcpip_listener,
 693                             state);
 694         if (fde == NULL) {
 695                 DEBUG(0, ("setup_tcpip_socket: Failed to add event handler!\n"));
 696                 goto out;
 697         }
 698
 699         tevent_fd_set_auto_close(fde);
 700
 701         return state->ep.port;
 702 out:
 703         if (state->fd != -1) {
 704                 close(state->fd);
 705         }
 706         TALLOC_FREE(state);
 707
 708         return 0;
 709 }
 710
 711 static void dcerpc_ncacn_tcpip_listener(struct tevent_context *ev,
 712                                         struct tevent_fd *fde,
 713                                         uint16_t flags,
 714                                         void *private_data)
 715 {
 716         struct dcerpc_ncacn_listen_state *state =
 717                         talloc_get_type_abort(private_data,
 718                                               struct dcerpc_ncacn_listen_state);
 719         struct tsocket_address *cli_addr = NULL;
 720         struct tsocket_address *srv_addr = NULL;
 721         struct sockaddr_storage addr;
 722         socklen_t in_addrlen = sizeof(addr);
 723         int s = -1;
 724         int rc;
 725
 726         s = accept(state->fd, (struct sockaddr *)(void *) &addr, &in_addrlen);
 727         if (s == -1) {
 728                 if (errno != EINTR) {
 729                         DEBUG(0,("tcpip_listener accept: %s\n",
 730                                  strerror(errno)));
 731                 }
 732                 return;
 733         }
 734
 735         rc = tsocket_address_bsd_from_sockaddr(state,
 736                                                (struct sockaddr *)(void *) &addr,
 737                                                in_addrlen,
 738                                                &cli_addr);
 739         if (rc < 0) {
 740                 close(s);
 741                 return;
 742         }
 743
 744         rc = getsockname(s, (struct sockaddr *)(void *) &addr, &in_addrlen);
 745         if (rc < 0) {
 746                 close(s);
 747                 return;
 748         }
 749
 750         rc = tsocket_address_bsd_from_sockaddr(state,
 751                                                (struct sockaddr *)(void *) &addr,
 752                                                in_addrlen,
 753                                                &srv_addr);
 754         if (rc < 0) {
 755                 close(s);
 756                 return;
 757         }
 758
 759         DEBUG(6, ("tcpip_listener: Accepted socket %d\n", s));
 760
 761         dcerpc_ncacn_accept(state->ev_ctx,
 762                             state->msg_ctx,
 763                             NCACN_IP_TCP,
 764                             NULL,
 765                             cli_addr,
 766                             srv_addr,
 767                             s,
 768                             NULL);
 769 }
 770
 771 /********************************************************************
 772  * Start listening on the ncalrpc socket
 773  ********************************************************************/
 774
 775 static void dcerpc_ncalrpc_listener(struct tevent_context *ev,
 776                                     struct tevent_fd *fde,
 777                                     uint16_t flags,
 778                                     void *private_data);
 779
 780 int create_dcerpc_ncalrpc_socket(const char *name)
 781 {
 782         int fd = -1;
 783
 784         if (name == NULL) {
 785                 name = "DEFAULT";
 786         }
 787
 788         if (!directory_create_or_exist(lp_ncalrpc_dir(), geteuid(), 0755)) {
 789                 DEBUG(0, ("Failed to create ncalrpc directory %s - %s\n",
 790                           lp_ncalrpc_dir(), strerror(errno)));
 791                 return -1;
 792         }
 793
 794         fd = create_pipe_sock(lp_ncalrpc_dir(), name, 0755);
 795         if (fd == -1) {
 796                 DEBUG(0, ("Failed to create ncalrpc socket! [%s/%s]\n",
 797                           lp_ncalrpc_dir(), name));
 798                 return -1;
 799         }
 800
 801         DEBUG(10, ("Openened ncalrpc socket fd %d for %s\n", fd, name));
 802
 803         return fd;
 804 }
 805
 806 bool setup_dcerpc_ncalrpc_socket(struct tevent_context *ev_ctx,
 807                                  struct messaging_context *msg_ctx,
 808                                  const char *name,
 809                                  dcerpc_ncacn_disconnect_fn fn)
 810 {
 811         struct dcerpc_ncacn_listen_state *state;
 812         struct tevent_fd *fde;
 813         int rc;
 814
 815         state = talloc(ev_ctx, struct dcerpc_ncacn_listen_state);
 816         if (state == NULL) {
 817                 DEBUG(0, ("Out of memory\n"));
 818                 return false;
 819         }
 820
 821         state->fd = -1;
 822         state->disconnect_fn = fn;
 823
 824         if (name == NULL) {
 825                 name = "DEFAULT";
 826         }
 827
 828         state->ep.name = talloc_strdup(state, name);
 829         if (state->ep.name == NULL) {
 830                 DEBUG(0, ("Out of memory\n"));
 831                 talloc_free(state);
 832                 return false;
 833         }
 834
 835         state->fd = create_dcerpc_ncalrpc_socket(name);
 836         if (state->fd == -1) {
 837                 goto out;
 838         }
 839
 840         rc = listen(state->fd, 5);
 841         if (rc < 0) {
 842                 DEBUG(0, ("Failed to listen on ncalrpc socket %s: %s\n",
 843                           name, strerror(errno)));
 844                 goto out;
 845         }
 846
 847         state->ev_ctx = ev_ctx;
 848         state->msg_ctx = msg_ctx;
 849
 850         /* Set server socket to non-blocking for the accept. */
 851         set_blocking(state->fd, false);
 852
 853         fde = tevent_add_fd(state->ev_ctx,
 854                             state,
 855                             state->fd,
 856                             TEVENT_FD_READ,
 857                             dcerpc_ncalrpc_listener,
 858                             state);
 859         if (fde == NULL) {
 860                 DEBUG(0, ("Failed to add event handler for ncalrpc!\n"));
 861                 goto out;
 862         }
 863
 864         tevent_fd_set_auto_close(fde);
 865
 866         return true;
 867 out:
 868         if (state->fd != -1) {
 869                 close(state->fd);
 870         }
 871         TALLOC_FREE(state);
 872
 873         return 0;
 874 }
 875
 876 static void dcerpc_ncalrpc_listener(struct tevent_context *ev,
 877                                         struct tevent_fd *fde,
 878                                         uint16_t flags,
 879                                         void *private_data)
 880 {
 881         struct dcerpc_ncacn_listen_state *state =
 882                         talloc_get_type_abort(private_data,
 883                                               struct dcerpc_ncacn_listen_state);
 884         struct tsocket_address *cli_addr = NULL;
 885         struct sockaddr_un sunaddr;
 886         struct sockaddr *addr = (struct sockaddr *)(void *)&sunaddr;
 887         socklen_t len = sizeof(sunaddr);
 888         int sd = -1;
 889         int rc;
 890
 891         ZERO_STRUCT(sunaddr);
 892
 893         sd = accept(state->fd, addr, &len);
 894         if (sd == -1) {
 895                 if (errno != EINTR) {
 896                         DEBUG(0, ("ncalrpc accept() failed: %s\n", strerror(errno)));
 897                 }
 898                 return;
 899         }
 900
 901         rc = tsocket_address_bsd_from_sockaddr(state,
 902                                                addr, len,
 903                                                &cli_addr);
 904         if (rc < 0) {
 905                 close(sd);
 906                 return;
 907         }
 908
 909         DEBUG(10, ("Accepted ncalrpc socket %d\n", sd));
 910
 911         dcerpc_ncacn_accept(state->ev_ctx,
 912                             state->msg_ctx,
 913                             NCALRPC,
 914                             state->ep.name,
 915                             cli_addr, NULL, sd,
 916                             state->disconnect_fn);
 917 }
 918
 919 struct dcerpc_ncacn_conn {
 920         enum dcerpc_transport_t transport;
 921
 922         int sock;
 923
 924         struct pipes_struct *p;
 925         dcerpc_ncacn_disconnect_fn disconnect_fn;
 926
 927         struct tevent_context *ev_ctx;
 928         struct messaging_context *msg_ctx;
 929
 930         struct tstream_context *tstream;
 931         struct tevent_queue *send_queue;
 932
 933         struct tsocket_address *client;
 934         char *client_name;
 935         struct tsocket_address *server;
 936         char *server_name;
 937         struct auth_session_info *session_info;
 938
 939         struct iovec *iov;
 940         size_t count;
 941 };
 942
 943 static void dcerpc_ncacn_packet_process(struct tevent_req *subreq);
 944 static void dcerpc_ncacn_packet_done(struct tevent_req *subreq);
 945
 946 void dcerpc_ncacn_accept(struct tevent_context *ev_ctx,
 947                          struct messaging_context *msg_ctx,
 948                          enum dcerpc_transport_t transport,
 949                          const char *name,
 950                          struct tsocket_address *cli_addr,
 951                          struct tsocket_address *srv_addr,
 952                          int s,
 953                          dcerpc_ncacn_disconnect_fn fn) {
 954         struct dcerpc_ncacn_conn *ncacn_conn;
 955         struct tevent_req *subreq;
 956         bool system_user = false;
 957         char *pipe_name;
 958         NTSTATUS status;
 959         int sys_errno;
 960         uid_t uid;
 961         gid_t gid;
 962         int rc;
 963
 964         DEBUG(10, ("dcerpc_ncacn_accept\n"));
 965
 966         ncacn_conn = talloc_zero(ev_ctx, struct dcerpc_ncacn_conn);
 967         if (ncacn_conn == NULL) {
 968                 DEBUG(0, ("Out of memory!\n"));
 969                 close(s);
 970                 return;
 971         }
 972
 973         ncacn_conn->transport = transport;
 974         ncacn_conn->ev_ctx = ev_ctx;
 975         ncacn_conn->msg_ctx = msg_ctx;
 976         ncacn_conn->sock = s;
 977         ncacn_conn->disconnect_fn = fn;
 978
 979         ncacn_conn->client = talloc_move(ncacn_conn, &cli_addr);
 980         if (tsocket_address_is_inet(ncacn_conn->client, "ip")) {
 981                 ncacn_conn->client_name =
 982                         tsocket_address_inet_addr_string(ncacn_conn->client,
 983                                                          ncacn_conn);
 984         } else {
 985                 ncacn_conn->client_name =
 986                         tsocket_address_unix_path(ncacn_conn->client,
 987                                                   ncacn_conn);
 988         }
 989         if (ncacn_conn->client_name == NULL) {
 990                 DEBUG(0, ("Out of memory!\n"));
 991                 talloc_free(ncacn_conn);
 992                 close(s);
 993                 return;
 994         }
 995
 996         if (srv_addr != NULL) {
 997                 ncacn_conn->server = talloc_move(ncacn_conn, &srv_addr);
 998
 999                 ncacn_conn->server_name =
1000                         tsocket_address_inet_addr_string(ncacn_conn->server,
1001                                                          ncacn_conn);
1002                 if (ncacn_conn->server_name == NULL) {
1003                         DEBUG(0, ("Out of memory!\n"));
1004                         talloc_free(ncacn_conn);
1005                         close(s);
1006                         return;
1007                 }
1008         }
1009
1010         switch (transport) {
1011                 case NCACN_IP_TCP:
1012                         pipe_name = tsocket_address_string(ncacn_conn->client,
1013                                                            ncacn_conn);
1014                         if (pipe_name == NULL) {
1015                                 close(s);
1016                                 talloc_free(ncacn_conn);
1017                                 return;
1018                         }
1019
1020                         break;
1021                 case NCALRPC:
1022                         rc = getpeereid(s, &uid, &gid);
1023                         if (rc < 0) {
1024                                 DEBUG(2, ("Failed to get ncalrpc connecting "
1025                                           "uid - %s!\n", strerror(errno)));
1026                         } else {
1027                                 if (uid == sec_initial_uid()) {
1028                                         system_user = true;
1029                                 }
1030                         }
1031                         /* FALL TROUGH */
1032                 case NCACN_NP:
1033                         pipe_name = talloc_strdup(ncacn_conn,
1034                                                   name);
1035                         if (pipe_name == NULL) {
1036                                 close(s);
1037                                 talloc_free(ncacn_conn);
1038                                 return;
1039                         }
1040                         break;
1041                 default:
1042                         DEBUG(0, ("unknown dcerpc transport: %u!\n",
1043                                   transport));
1044                         talloc_free(ncacn_conn);
1045                         close(s);
1046                         return;
1047         }
1048
1049         rc = set_blocking(s, false);
1050         if (rc < 0) {
1051                 DEBUG(2, ("Failed to set dcerpc socket to non-blocking\n"));
1052                 talloc_free(ncacn_conn);
1053                 close(s);
1054                 return;
1055         }
1056
1057         /*
1058          * As soon as we have tstream_bsd_existing_socket set up it will
1059          * take care of closing the socket.
1060          */
1061         rc = tstream_bsd_existing_socket(ncacn_conn, s, &ncacn_conn->tstream);
1062         if (rc < 0) {
1063                 DEBUG(2, ("Failed to create tstream socket for dcerpc\n"));
1064                 talloc_free(ncacn_conn);
1065                 close(s);
1066                 return;
1067         }
1068
1069         if (ncacn_conn->session_info == NULL) {
1070                 status = auth_anonymous_session_info(ncacn_conn,
1071                                                      &ncacn_conn->session_info);
1072                 if (!NT_STATUS_IS_OK(status)) {
1073                         DEBUG(2, ("Failed to create "
1074                                   "auth_anonymous_session_info - %s\n",
1075                                   nt_errstr(status)));
1076                         talloc_free(ncacn_conn);
1077                         return;
1078                 }
1079         }
1080
1081         rc = make_server_pipes_struct(ncacn_conn,
1082                                       ncacn_conn->msg_ctx,
1083                                       pipe_name,
1084                                       ncacn_conn->transport,
1085                                       system_user,
1086                                       ncacn_conn->server,
1087                                       ncacn_conn->client,
1088                                       ncacn_conn->session_info,
1089                                       &ncacn_conn->p,
1090                                       &sys_errno);
1091         if (rc < 0) {
1092                 DEBUG(2, ("Failed to create pipe struct - %s",
1093                           strerror(sys_errno)));
1094                 talloc_free(ncacn_conn);
1095                 return;
1096         }
1097
1098         ncacn_conn->send_queue = tevent_queue_create(ncacn_conn,
1099                                                         "dcerpc send queue");
1100         if (ncacn_conn->send_queue == NULL) {
1101                 DEBUG(0, ("Out of memory!\n"));
1102                 talloc_free(ncacn_conn);
1103                 return;
1104         }
1105
1106         subreq = dcerpc_read_ncacn_packet_send(ncacn_conn,
1107                                                ncacn_conn->ev_ctx,
1108                                                ncacn_conn->tstream);
1109         if (subreq == NULL) {
1110                 DEBUG(2, ("Failed to send ncacn packet\n"));
1111                 talloc_free(ncacn_conn);
1112                 return;
1113         }
1114
1115         tevent_req_set_callback(subreq, dcerpc_ncacn_packet_process, ncacn_conn);
1116
1117         DEBUG(10, ("dcerpc_ncacn_accept done\n"));
1118
1119         return;
1120 }
1121
1122 static void dcerpc_ncacn_packet_process(struct tevent_req *subreq)
1123 {
1124         struct dcerpc_ncacn_conn *ncacn_conn =
1125                 tevent_req_callback_data(subreq, struct dcerpc_ncacn_conn);
1126
1127         struct _output_data *out = &ncacn_conn->p->out_data;
1128         DATA_BLOB recv_buffer = data_blob_null;
1129         struct ncacn_packet *pkt;
1130         ssize_t data_left;
1131         ssize_t data_used;
1132         uint32_t to_send;
1133         char *data;
1134         NTSTATUS status;
1135         bool ok;
1136
1137         status = dcerpc_read_ncacn_packet_recv(subreq, ncacn_conn, &pkt, &recv_buffer);
1138         TALLOC_FREE(subreq);
1139         if (!NT_STATUS_IS_OK(status)) {
1140                 if (ncacn_conn->disconnect_fn != NULL) {
1141                         ok = ncacn_conn->disconnect_fn(ncacn_conn->p);
1142                         if (!ok) {
1143                                 DEBUG(3, ("Failed to call disconnect function\n"));
1144                         }
1145                 }
1146                 goto fail;
1147         }
1148
1149         data_left = recv_buffer.length;
1150         data = (char *) recv_buffer.data;
1151
1152         while (data_left) {
1153                 data_used = process_incoming_data(ncacn_conn->p, data, data_left);
1154                 if (data_used < 0) {
1155                         DEBUG(3, ("Failed to process dcerpc request!\n"));
1156                         status = NT_STATUS_UNEXPECTED_IO_ERROR;
1157                         goto fail;
1158                 }
1159
1160                 data_left -= data_used;
1161                 data += data_used;
1162         }
1163
1164         /* Do not leak this buffer */
1165         talloc_free(recv_buffer.data);
1166         talloc_free(pkt);
1167
1168         /*
1169          * This is needed because of the way DCERPC binds work in the RPC
1170          * marshalling code
1171          */
1172         to_send = out->frag.length - out->current_pdu_sent;
1173         if (to_send > 0) {
1174
1175                 DEBUG(10, ("Current_pdu_len = %u, "
1176                            "current_pdu_sent = %u "
1177                            "Returning %u bytes\n",
1178                            (unsigned int)out->frag.length,
1179                            (unsigned int)out->current_pdu_sent,
1180                            (unsigned int)to_send));
1181
1182                 ncacn_conn->iov = talloc_zero(ncacn_conn, struct iovec);
1183                 if (ncacn_conn->iov == NULL) {
1184                         status = NT_STATUS_NO_MEMORY;
1185                         DEBUG(3, ("Out of memory!\n"));
1186                         goto fail;
1187                 }
1188                 ncacn_conn->count = 1;
1189
1190                 ncacn_conn->iov[0].iov_base = out->frag.data
1191                                             + out->current_pdu_sent;
1192                 ncacn_conn->iov[0].iov_len = to_send;
1193
1194                 out->current_pdu_sent += to_send;
1195         }
1196
1197         /*
1198          * This condition is false for bind packets, or when we haven't yet got
1199          * a full request, and need to wait for more data from the client
1200          */
1201         while (out->data_sent_length < out->rdata.length) {
1202                 ok = create_next_pdu(ncacn_conn->p);
1203                 if (!ok) {
1204                         DEBUG(3, ("Failed to create next PDU!\n"));
1205                         status = NT_STATUS_UNEXPECTED_IO_ERROR;
1206                         goto fail;
1207                 }
1208
1209                 ncacn_conn->iov = talloc_realloc(ncacn_conn,
1210                                                  ncacn_conn->iov,
1211                                                  struct iovec,
1212                                                  ncacn_conn->count + 1);
1213                 if (ncacn_conn->iov == NULL) {
1214                         DEBUG(3, ("Out of memory!\n"));
1215                         status = NT_STATUS_NO_MEMORY;
1216                         goto fail;
1217                 }
1218
1219                 ncacn_conn->iov[ncacn_conn->count].iov_base = out->frag.data;
1220                 ncacn_conn->iov[ncacn_conn->count].iov_len = out->frag.length;
1221
1222                 DEBUG(10, ("PDU number: %d, PDU Length: %u\n",
1223                            (unsigned int) ncacn_conn->count,
1224                            (unsigned int) ncacn_conn->iov[ncacn_conn->count].iov_len));
1225                 dump_data(11, (const uint8_t *) ncacn_conn->iov[ncacn_conn->count].iov_base,
1226                               ncacn_conn->iov[ncacn_conn->count].iov_len);
1227                 ncacn_conn->count++;
1228         }
1229
1230         /*
1231          * We still don't have a complete request, go back and wait for more
1232          * data.
1233          */
1234         if (ncacn_conn->count == 0) {
1235                 /* Wait for the next packet */
1236                 subreq = dcerpc_read_ncacn_packet_send(ncacn_conn,
1237                                                        ncacn_conn->ev_ctx,
1238                                                        ncacn_conn->tstream);
1239                 if (subreq == NULL) {
1240                         DEBUG(2, ("Failed to start receving packets\n"));
1241                         status = NT_STATUS_NO_MEMORY;
1242                         goto fail;
1243                 }
1244                 tevent_req_set_callback(subreq, dcerpc_ncacn_packet_process, ncacn_conn);
1245                 return;
1246         }
1247
1248         DEBUG(10, ("Sending a total of %u bytes\n",
1249                    (unsigned int)ncacn_conn->p->out_data.data_sent_length));
1250
1251         subreq = tstream_writev_queue_send(ncacn_conn,
1252                                            ncacn_conn->ev_ctx,
1253                                            ncacn_conn->tstream,
1254                                            ncacn_conn->send_queue,
1255                                            ncacn_conn->iov,
1256                                            ncacn_conn->count);
1257         if (subreq == NULL) {
1258                 DEBUG(2, ("Failed to send packet\n"));
1259                 status = NT_STATUS_NO_MEMORY;
1260                 goto fail;
1261         }
1262
1263         tevent_req_set_callback(subreq, dcerpc_ncacn_packet_done, ncacn_conn);
1264         return;
1265
1266 fail:
1267         DEBUG(3, ("Terminating client(%s) connection! - '%s'\n",
1268                   ncacn_conn->client_name, nt_errstr(status)));
1269
1270         /* Terminate client connection */
1271         talloc_free(ncacn_conn);
1272         return;
1273 }
1274
1275 static void dcerpc_ncacn_packet_done(struct tevent_req *subreq)
1276 {
1277         struct dcerpc_ncacn_conn *ncacn_conn =
1278                 tevent_req_callback_data(subreq, struct dcerpc_ncacn_conn);
1279         NTSTATUS status = NT_STATUS_OK;
1280         int sys_errno;
1281         int rc;
1282
1283         rc = tstream_writev_queue_recv(subreq, &sys_errno);
1284         TALLOC_FREE(subreq);
1285         if (rc < 0) {
1286                 DEBUG(2, ("Writev failed!\n"));
1287                 status = map_nt_error_from_unix(sys_errno);
1288                 goto fail;
1289         }
1290
1291         /* clear out any data that may have been left around */
1292         ncacn_conn->count = 0;
1293         TALLOC_FREE(ncacn_conn->iov);
1294         data_blob_free(&ncacn_conn->p->in_data.data);
1295         data_blob_free(&ncacn_conn->p->out_data.frag);
1296         data_blob_free(&ncacn_conn->p->out_data.rdata);
1297
1298         talloc_free_children(ncacn_conn->p->mem_ctx);
1299
1300         /* Wait for the next packet */
1301         subreq = dcerpc_read_ncacn_packet_send(ncacn_conn,
1302                                                ncacn_conn->ev_ctx,
1303                                                ncacn_conn->tstream);
1304         if (subreq == NULL) {
1305                 DEBUG(2, ("Failed to start receving packets\n"));
1306                 status = NT_STATUS_NO_MEMORY;
1307                 goto fail;
1308         }
1309
1310         tevent_req_set_callback(subreq, dcerpc_ncacn_packet_process, ncacn_conn);
1311         return;
1312
1313 fail:
1314         DEBUG(3, ("Terminating client(%s) connection! - '%s'\n",
1315                   ncacn_conn->client_name, nt_errstr(status)));
1316
1317         /* Terminate client connection */
1318         talloc_free(ncacn_conn);
1319         return;
1320 }
1321
1322 /* vim: set ts=8 sw=8 noet cindent syntax=c.doxygen: */