source4/smbd/service_named_pipe.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    helper functions for NAMED PIPE servers
   5
   6    Copyright (C) Stefan (metze) Metzmacher      2008
   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 <tevent.h>
  24 #include "smbd/service.h"
  25 #include "param/param.h"
  26 #include "auth/auth.h"
  27 #include "auth/session.h"
  28 #include "auth/auth_sam_reply.h"
  29 #include "lib/socket/socket.h"
  30 #include "lib/tsocket/tsocket.h"
  31 #include "libcli/util/tstream.h"
  32 #include "librpc/gen_ndr/ndr_named_pipe_auth.h"
  33 #include "system/passwd.h"
  34 #include "system/network.h"
  35 #include "libcli/raw/smb.h"
  36 #include "auth/credentials/credentials.h"
  37 #include "auth/credentials/credentials_krb5.h"
  38
  39 struct named_pipe_socket {
  40         const char *pipe_name;
  41         const char *pipe_path;
  42         const struct stream_server_ops *ops;
  43         void *private_data;
  44 };
  45
  46 struct named_pipe_connection {
  47         struct stream_connection *connection;
  48         const struct named_pipe_socket *pipe_sock;
  49         struct tstream_context *tstream;
  50 };
  51
  52 static void named_pipe_terminate_connection(struct named_pipe_connection *pipe_conn, const char *reason)
  53 {
  54         stream_terminate_connection(pipe_conn->connection, reason);
  55 }
  56
  57 static NTSTATUS named_pipe_full_request(void *private_data, DATA_BLOB blob, size_t *size)
  58 {
  59         if (blob.length < 8) {
  60                 return STATUS_MORE_ENTRIES;
  61         }
  62
  63         if (memcmp(NAMED_PIPE_AUTH_MAGIC, &blob.data[4], 4) != 0) {
  64                 DEBUG(0,("named_pipe_full_request: wrong protocol\n"));
  65                 *size = blob.length;
  66                 /* the error will be handled in named_pipe_recv_auth_request */
  67                 return NT_STATUS_OK;
  68         }
  69
  70         *size = 4 + RIVAL(blob.data, 0);
  71         if (*size > blob.length) {
  72                 return STATUS_MORE_ENTRIES;
  73         }
  74
  75         return NT_STATUS_OK;
  76 }
  77
  78 static void named_pipe_auth_request(struct tevent_req *subreq);
  79
  80 static void named_pipe_accept(struct stream_connection *conn)
  81 {
  82         struct named_pipe_socket *pipe_sock = talloc_get_type(conn->private_data,
  83                                                 struct named_pipe_socket);
  84         struct named_pipe_connection *pipe_conn;
  85         struct tevent_req *subreq;
  86         int rc, fd;
  87
  88         pipe_conn = talloc_zero(conn, struct named_pipe_connection);
  89         if (pipe_conn == NULL) {
  90                 stream_terminate_connection(conn,
  91                                 "named_pipe_accept: out of memory");
  92                 return;
  93         }
  94
  95         TALLOC_FREE(conn->event.fde);
  96
  97         /*
  98          * We have to duplicate the fd, cause it gets closed when the tstream
  99          * is freed and you shouldn't work a fd the tstream is based on.
 100          */
 101         fd = dup(socket_get_fd(conn->socket));
 102         if (fd == -1) {
 103                 char *reason;
 104
 105                 reason = talloc_asprintf(conn,
 106                                          "named_pipe_accept: failed to duplicate the file descriptor - %s",
 107                                          strerror(errno));
 108                 if (reason == NULL) {
 109                         reason = strerror(errno);
 110                 }
 111                 stream_terminate_connection(conn, reason);
 112         }
 113         rc = tstream_bsd_existing_socket(pipe_conn,
 114                                          fd,
 115                                          &pipe_conn->tstream);
 116         if (rc < 0) {
 117                 stream_terminate_connection(conn,
 118                                 "named_pipe_accept: out of memory");
 119                 return;
 120         }
 121
 122         pipe_conn->connection = conn;
 123         pipe_conn->pipe_sock = pipe_sock;
 124         conn->private_data = pipe_conn;
 125
 126         /*
 127          * The named pipe pdu's have the length as 8 byte (initial_read_size),
 128          * named_pipe_full_request provides the pdu length then.
 129          */
 130         subreq = tstream_read_pdu_blob_send(pipe_conn,
 131                                             pipe_conn->connection->event.ctx,
 132                                             pipe_conn->tstream,
 133                                             8, /* initial_read_size */
 134                                             named_pipe_full_request,
 135                                             pipe_conn);
 136         if (subreq == NULL) {
 137                 named_pipe_terminate_connection(pipe_conn,
 138                                 "named_pipe_accept: "
 139                                 "no memory for tstream_read_pdu_blob_send");
 140                 return;
 141         }
 142         tevent_req_set_callback(subreq, named_pipe_auth_request, pipe_conn);
 143 }
 144
 145 struct named_pipe_call {
 146         struct named_pipe_connection *pipe_conn;
 147         DATA_BLOB in;
 148         DATA_BLOB out;
 149         struct iovec out_iov[1];
 150         NTSTATUS status;
 151 };
 152
 153 static void named_pipe_handover_connection(struct tevent_req *subreq);
 154
 155 static void named_pipe_auth_request(struct tevent_req *subreq)
 156 {
 157         struct named_pipe_connection *pipe_conn = tevent_req_callback_data(subreq,
 158                                       struct named_pipe_connection);
 159         struct stream_connection *conn = pipe_conn->connection;
 160         struct named_pipe_call *call;
 161         enum ndr_err_code ndr_err;
 162         union netr_Validation val;
 163         struct auth_serversupplied_info *server_info;
 164         struct named_pipe_auth_req pipe_request;
 165         struct named_pipe_auth_rep pipe_reply;
 166         struct auth_context *auth_context;
 167         NTSTATUS status;
 168         int ret;
 169
 170         call = talloc(pipe_conn, struct named_pipe_call);
 171         if (call == NULL) {
 172                 named_pipe_terminate_connection(pipe_conn,
 173                                 "named_pipe_auth_request: "
 174                                 "no memory for named_pipe_call");
 175                 return;
 176         }
 177         call->pipe_conn = pipe_conn;
 178
 179         status = tstream_read_pdu_blob_recv(subreq,
 180                                             call,
 181                                             &call->in);
 182         TALLOC_FREE(subreq);
 183         if (!NT_STATUS_IS_OK(status)) {
 184                 const char *reason;
 185
 186                 reason = talloc_asprintf(call, "named_pipe_call_loop: "
 187                                          "tstream_read_pdu_blob_recv() - %s",
 188                                          nt_errstr(status));
 189                 if (reason == NULL) {
 190                         reason = nt_errstr(status);
 191                 }
 192
 193                 named_pipe_terminate_connection(pipe_conn, reason);
 194                 return;
 195         }
 196
 197         DEBUG(10,("Received named_pipe packet of length %lu from %s\n",
 198                  (long) call->in.length,
 199                  tsocket_address_string(pipe_conn->connection->remote_address, call)));
 200         dump_data(11, call->in.data, call->in.length);
 201
 202         /*
 203          * TODO: check it's a root (uid == 0) pipe
 204          */
 205
 206         ZERO_STRUCT(pipe_reply);
 207         pipe_reply.level = 0;
 208         pipe_reply.status = NT_STATUS_INTERNAL_ERROR;
 209
 210         /* parse the passed credentials */
 211         ndr_err = ndr_pull_struct_blob_all(
 212                         &call->in,
 213                         pipe_conn,
 214                         &pipe_request,
 215                         (ndr_pull_flags_fn_t) ndr_pull_named_pipe_auth_req);
 216         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 217                 pipe_reply.status = ndr_map_error2ntstatus(ndr_err);
 218                 DEBUG(2, ("Could not unmarshall named_pipe_auth_req: %s\n",
 219                           nt_errstr(pipe_reply.status)));
 220                 goto reply;
 221         }
 222
 223         if (DEBUGLVL(10)) {
 224                 NDR_PRINT_DEBUG(named_pipe_auth_req, &pipe_request);
 225         }
 226
 227         if (strcmp(NAMED_PIPE_AUTH_MAGIC, pipe_request.magic) != 0) {
 228                 DEBUG(2, ("named_pipe_auth_req: invalid magic '%s' != %s\n",
 229                           pipe_request.magic, NAMED_PIPE_AUTH_MAGIC));
 230                 pipe_reply.status = NT_STATUS_INVALID_PARAMETER;
 231                 goto reply;
 232         }
 233
 234         switch (pipe_request.level) {
 235         case 0:
 236                 /*
 237                  * anon connection, we don't create a session info
 238                  * and leave it NULL
 239                  */
 240                 pipe_reply.level = 0;
 241                 pipe_reply.status = NT_STATUS_OK;
 242                 break;
 243         case 1:
 244                 val.sam3 = &pipe_request.info.info1;
 245
 246                 pipe_reply.level = 1;
 247                 pipe_reply.status = make_server_info_netlogon_validation(pipe_conn,
 248                                                                          "TODO",
 249                                                                          3, &val,
 250                                                                          &server_info);
 251                 if (!NT_STATUS_IS_OK(pipe_reply.status)) {
 252                         DEBUG(2, ("make_server_info_netlogon_validation returned "
 253                                   "%s\n", nt_errstr(pipe_reply.status)));
 254                         goto reply;
 255                 }
 256
 257                 pipe_reply.status = auth_context_create(conn,
 258                                                         conn->event.ctx, conn->msg_ctx,
 259                                                         conn->lp_ctx,
 260                                                         &auth_context);
 261                 if (!NT_STATUS_IS_OK(pipe_reply.status)) {
 262                         DEBUG(2, ("auth_context_create returned "
 263                                   "%s\n", nt_errstr(pipe_reply.status)));
 264                         goto reply;
 265                 }
 266
 267
 268                 /* setup the session_info on the connection */
 269                 pipe_reply.status = auth_context->generate_session_info(conn,
 270                                                                         auth_context,
 271                                                                         server_info,
 272                                                                         &conn->session_info);
 273                 talloc_free(auth_context);
 274                 if (!NT_STATUS_IS_OK(pipe_reply.status)) {
 275                         DEBUG(2, ("auth_generate_session_info failed: %s\n",
 276                                   nt_errstr(pipe_reply.status)));
 277                         goto reply;
 278                 }
 279
 280                 break;
 281         case 2:
 282                 pipe_reply.level = 2;
 283                 pipe_reply.info.info2.file_type = FILE_TYPE_MESSAGE_MODE_PIPE;
 284                 pipe_reply.info.info2.device_state = 0xff | 0x0400 | 0x0100;
 285                 pipe_reply.info.info2.allocation_size = 4096;
 286
 287                 if (pipe_request.info.info2.sam_info3 == NULL) {
 288                         /*
 289                          * anon connection, we don't create a session info
 290                          * and leave it NULL
 291                          */
 292                         pipe_reply.status = NT_STATUS_OK;
 293                         break;
 294                 }
 295
 296                 val.sam3 = pipe_request.info.info2.sam_info3;
 297
 298                 pipe_reply.status = make_server_info_netlogon_validation(pipe_conn,
 299                                                 val.sam3->base.account_name.string,
 300                                                 3, &val, &server_info);
 301                 if (!NT_STATUS_IS_OK(pipe_reply.status)) {
 302                         DEBUG(2, ("make_server_info_netlogon_validation returned "
 303                                   "%s\n", nt_errstr(pipe_reply.status)));
 304                         goto reply;
 305                 }
 306
 307                 /* setup the session_info on the connection */
 308                 pipe_reply.status = auth_context_create(conn,
 309                                                         conn->event.ctx, conn->msg_ctx,
 310                                                         conn->lp_ctx,
 311                                                         &auth_context);
 312                 if (!NT_STATUS_IS_OK(pipe_reply.status)) {
 313                         DEBUG(2, ("auth_context_create returned "
 314                                   "%s\n", nt_errstr(pipe_reply.status)));
 315                         goto reply;
 316                 }
 317
 318                 pipe_reply.status = auth_context->generate_session_info(conn,
 319                                                                         auth_context,
 320                                                                         server_info,
 321                                                                         &conn->session_info);
 322                 talloc_free(auth_context);
 323                 if (!NT_STATUS_IS_OK(pipe_reply.status)) {
 324                         DEBUG(2, ("auth_generate_session_info failed: %s\n",
 325                                   nt_errstr(pipe_reply.status)));
 326                         goto reply;
 327                 }
 328
 329                 conn->session_info->session_key = data_blob_const(pipe_request.info.info2.session_key,
 330                                                         pipe_request.info.info2.session_key_length);
 331                 talloc_steal(conn->session_info, pipe_request.info.info2.session_key);
 332
 333                 break;
 334         case 3:
 335                 pipe_reply.level = 3;
 336                 pipe_reply.info.info3.file_type = FILE_TYPE_MESSAGE_MODE_PIPE;
 337                 pipe_reply.info.info3.device_state = 0xff | 0x0400 | 0x0100;
 338                 pipe_reply.info.info3.allocation_size = 4096;
 339
 340                 if (pipe_request.info.info3.server_addr == NULL) {
 341                         pipe_reply.status = NT_STATUS_INVALID_ADDRESS;
 342                         DEBUG(2, ("Missing server address\n"));
 343                         goto reply;
 344                 }
 345                 if (pipe_request.info.info3.client_addr == NULL) {
 346                         pipe_reply.status = NT_STATUS_INVALID_ADDRESS;
 347                         DEBUG(2, ("Missing client address\n"));
 348                         goto reply;
 349                 }
 350
 351                 ret = tsocket_address_inet_from_strings(conn, "ip",
 352                                                         pipe_request.info.info3.server_addr,
 353                                                         pipe_request.info.info3.server_port,
 354                                                         &conn->local_address);
 355                 if (ret != 0) {
 356                         DEBUG(2, ("Invalid server address[%s] port[%u] - %s\n",
 357                                 pipe_request.info.info3.server_addr,
 358                                 pipe_request.info.info3.server_port,
 359                                 strerror(errno)));
 360                         pipe_reply.status = NT_STATUS_INVALID_ADDRESS;
 361                         goto reply;
 362                 }
 363
 364                 ret = tsocket_address_inet_from_strings(conn, "ip",
 365                                                         pipe_request.info.info3.client_addr,
 366                                                         pipe_request.info.info3.client_port,
 367                                                         &conn->remote_address);
 368                 if (ret != 0) {
 369                         DEBUG(2, ("Invalid client address[%s] port[%u] - %s\n",
 370                                 pipe_request.info.info3.client_addr,
 371                                 pipe_request.info.info3.client_port,
 372                                 strerror(errno)));
 373                         pipe_reply.status = NT_STATUS_INVALID_ADDRESS;
 374                         goto reply;
 375                 }
 376
 377                 if (pipe_request.info.info3.sam_info3 == NULL) {
 378                         /*
 379                          * anon connection, we don't create a session info
 380                          * and leave it NULL
 381                          */
 382                         pipe_reply.status = NT_STATUS_OK;
 383                         break;
 384                 }
 385
 386                 val.sam3 = pipe_request.info.info3.sam_info3;
 387
 388                 pipe_reply.status = make_server_info_netlogon_validation(pipe_conn,
 389                                                 val.sam3->base.account_name.string,
 390                                                 3, &val, &server_info);
 391                 if (!NT_STATUS_IS_OK(pipe_reply.status)) {
 392                         DEBUG(2, ("make_server_info_netlogon_validation returned "
 393                                   "%s\n", nt_errstr(pipe_reply.status)));
 394                         goto reply;
 395                 }
 396
 397                 /* setup the session_info on the connection */
 398                 pipe_reply.status = auth_context_create(conn,
 399                                                         conn->event.ctx, conn->msg_ctx,
 400                                                         conn->lp_ctx,
 401                                                         &auth_context);
 402                 if (!NT_STATUS_IS_OK(pipe_reply.status)) {
 403                         DEBUG(2, ("auth_context_create returned "
 404                                   "%s\n", nt_errstr(pipe_reply.status)));
 405                         goto reply;
 406                 }
 407
 408                 /* setup the session_info on the connection */
 409                 pipe_reply.status = auth_context->generate_session_info(conn,
 410                                                                         auth_context,
 411                                                                         server_info,
 412                                                                         &conn->session_info);
 413                 talloc_free(auth_context);
 414                 if (!NT_STATUS_IS_OK(pipe_reply.status)) {
 415                         DEBUG(2, ("auth_generate_session_info failed: %s\n",
 416                                   nt_errstr(pipe_reply.status)));
 417                         goto reply;
 418                 }
 419
 420                 if (pipe_request.info.info3.gssapi_delegated_creds_length) {
 421                         OM_uint32 minor_status;
 422                         gss_buffer_desc cred_token;
 423                         gss_cred_id_t cred_handle;
 424                         const char *error_string;
 425
 426                         DEBUG(10, ("named_pipe_auth: delegated credentials supplied by client\n"));
 427
 428                         cred_token.value = pipe_request.info.info3.gssapi_delegated_creds;
 429                         cred_token.length = pipe_request.info.info3.gssapi_delegated_creds_length;
 430
 431                         ret = gss_import_cred(&minor_status,
 432                                                &cred_token,
 433                                                &cred_handle);
 434                         if (ret != GSS_S_COMPLETE) {
 435                                 pipe_reply.status = NT_STATUS_INTERNAL_ERROR;
 436                                 goto reply;
 437                         }
 438
 439                         conn->session_info->credentials = cli_credentials_init(conn->session_info);
 440                         if (conn->session_info->credentials == NULL) {
 441                                 pipe_reply.status = NT_STATUS_NO_MEMORY;
 442                                 goto reply;
 443                         }
 444
 445                         cli_credentials_set_conf(conn->session_info->credentials,
 446                                                  conn->lp_ctx);
 447                         /* Just so we don't segfault trying to get at a username */
 448                         cli_credentials_set_anonymous(conn->session_info->credentials);
 449
 450                         ret = cli_credentials_set_client_gss_creds(conn->session_info->credentials,
 451                                                                    conn->event.ctx,
 452                                                                    conn->lp_ctx,
 453                                                                    cred_handle,
 454                                                                    CRED_SPECIFIED, &error_string);
 455                         if (ret) {
 456                                 pipe_reply.status = NT_STATUS_INTERNAL_ERROR;
 457                                 DEBUG(2, ("Failed to set pipe forwarded creds: %s\n", error_string));
 458                                 goto reply;
 459                         }
 460
 461                         /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
 462                         cli_credentials_set_kerberos_state(conn->session_info->credentials,
 463                                                            CRED_MUST_USE_KERBEROS);
 464                 }
 465
 466                 conn->session_info->session_key = data_blob_const(pipe_request.info.info3.session_key,
 467                                                         pipe_request.info.info3.session_key_length);
 468                 talloc_steal(conn->session_info, pipe_request.info.info3.session_key);
 469
 470                 break;
 471         default:
 472                 DEBUG(0, ("named_pipe_auth_req: unknown level %u\n",
 473                           pipe_request.level));
 474                 pipe_reply.level = 0;
 475                 pipe_reply.status = NT_STATUS_INVALID_LEVEL;
 476                 goto reply;
 477         }
 478
 479 reply:
 480         /* create the output */
 481         ndr_err = ndr_push_struct_blob(&call->out, pipe_conn,
 482                         &pipe_reply,
 483                         (ndr_push_flags_fn_t)ndr_push_named_pipe_auth_rep);
 484         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 485                 const char *reason;
 486                 status = ndr_map_error2ntstatus(ndr_err);
 487
 488                 reason = talloc_asprintf(pipe_conn, "named_pipe_auth_request: could not marshall named_pipe_auth_rep: %s\n",
 489                                          nt_errstr(status));
 490                 if (reason == NULL) {
 491                         reason = "named_pipe_auth_request: could not marshall named_pipe_auth_rep";
 492                 }
 493                 named_pipe_terminate_connection(pipe_conn, reason);
 494                 return;
 495         }
 496
 497         DEBUG(10,("named_pipe_auth_request: named_pipe_auth reply[%u]\n",
 498                   (unsigned) call->out.length));
 499         dump_data(11, call->out.data, call->out.length);
 500         if (DEBUGLVL(10)) {
 501                 NDR_PRINT_DEBUG(named_pipe_auth_rep, &pipe_reply);
 502         }
 503
 504         call->status = pipe_reply.status;
 505
 506         call->out_iov[0].iov_base = call->out.data;
 507         call->out_iov[0].iov_len = call->out.length;
 508
 509         subreq = tstream_writev_send(call,
 510                                      pipe_conn->connection->event.ctx,
 511                                      pipe_conn->tstream,
 512                                      call->out_iov, 1);
 513         if (subreq == NULL) {
 514                 named_pipe_terminate_connection(pipe_conn, "named_pipe_auth_request: "
 515                                 "no memory for tstream_writev_send");
 516                 return;
 517         }
 518
 519         tevent_req_set_callback(subreq, named_pipe_handover_connection, call);
 520 }
 521
 522 static void named_pipe_handover_connection(struct tevent_req *subreq)
 523 {
 524         struct named_pipe_call *call = tevent_req_callback_data(subreq,
 525                         struct named_pipe_call);
 526         struct named_pipe_connection *pipe_conn = call->pipe_conn;
 527         struct stream_connection *conn = pipe_conn->connection;
 528         int sys_errno;
 529         int rc;
 530
 531         rc = tstream_writev_recv(subreq, &sys_errno);
 532         TALLOC_FREE(subreq);
 533         if (rc == -1) {
 534                 const char *reason;
 535
 536                 reason = talloc_asprintf(call, "named_pipe_handover_connection: "
 537                                          "tstream_writev_recv() - %d:%s",
 538                                          sys_errno, strerror(sys_errno));
 539                 if (reason == NULL) {
 540                         reason = "named_pipe_handover_connection: "
 541                                  "tstream_writev_recv() failed";
 542                 }
 543
 544                 named_pipe_terminate_connection(pipe_conn, reason);
 545                 return;
 546         }
 547
 548         if (!NT_STATUS_IS_OK(call->status)) {
 549                 const char *reason;
 550
 551                 reason = talloc_asprintf(call, "named_pipe_handover_connection: "
 552                                         "reply status - %s", nt_errstr(call->status));
 553                 if (reason == NULL) {
 554                         reason = nt_errstr(call->status);
 555                 }
 556
 557                 named_pipe_terminate_connection(pipe_conn, reason);
 558                 return;
 559         }
 560
 561         /*
 562          * remove the named_pipe layer together with its packet layer
 563          */
 564         conn->ops               = pipe_conn->pipe_sock->ops;
 565         conn->private_data      = pipe_conn->pipe_sock->private_data;
 566         talloc_unlink(conn, pipe_conn);
 567
 568         conn->event.fde = tevent_add_fd(conn->event.ctx,
 569                                         conn,
 570                                         socket_get_fd(conn->socket),
 571                                         TEVENT_FD_READ,
 572                                         stream_io_handler_fde,
 573                                         conn);
 574         if (conn->event.fde == NULL) {
 575                 named_pipe_terminate_connection(pipe_conn, "named_pipe_handover_connection: "
 576                                 "setting up the stream_io_handler_fde failed");
 577                 return;
 578         }
 579
 580         /*
 581          * hand over to the real pipe implementation,
 582          * now that we have setup the transport session_info
 583          */
 584         conn->ops->accept_connection(conn);
 585
 586         DEBUG(10,("named_pipe_handover_connection[%s]: succeeded\n",
 587               conn->ops->name));
 588
 589         /* we don't have to free call here as the connection got closed */
 590 }
 591
 592 /*
 593   called when a pipe socket becomes readable
 594 */
 595 static void named_pipe_recv(struct stream_connection *conn, uint16_t flags)
 596 {
 597         struct named_pipe_connection *pipe_conn = talloc_get_type(
 598                 conn->private_data, struct named_pipe_connection);
 599
 600         named_pipe_terminate_connection(pipe_conn,
 601                                         "named_pipe_recv: called");
 602 }
 603
 604 /*
 605   called when a pipe socket becomes writable
 606 */
 607 static void named_pipe_send(struct stream_connection *conn, uint16_t flags)
 608 {
 609         struct named_pipe_connection *pipe_conn = talloc_get_type(
 610                 conn->private_data, struct named_pipe_connection);
 611
 612         named_pipe_terminate_connection(pipe_conn,
 613                                         "named_pipe_send: called");
 614 }
 615
 616 static const struct stream_server_ops named_pipe_stream_ops = {
 617         .name                   = "named_pipe",
 618         .accept_connection      = named_pipe_accept,
 619         .recv_handler           = named_pipe_recv,
 620         .send_handler           = named_pipe_send,
 621 };
 622
 623 NTSTATUS stream_setup_named_pipe(struct tevent_context *event_context,
 624                                  struct loadparm_context *lp_ctx,
 625                                  const struct model_ops *model_ops,
 626                                  const struct stream_server_ops *stream_ops,
 627                                  const char *pipe_name,
 628                                  void *private_data)
 629 {
 630         char *dirname;
 631         struct named_pipe_socket *pipe_sock;
 632         NTSTATUS status = NT_STATUS_NO_MEMORY;;
 633
 634         pipe_sock = talloc(event_context, struct named_pipe_socket);
 635         if (pipe_sock == NULL) {
 636                 goto fail;
 637         }
 638
 639         /* remember the details about the pipe */
 640         pipe_sock->pipe_name    = talloc_strdup(pipe_sock, pipe_name);
 641         if (pipe_sock->pipe_name == NULL) {
 642                 goto fail;
 643         }
 644
 645         dirname = talloc_asprintf(pipe_sock, "%s/np", lp_ncalrpc_dir(lp_ctx));
 646         if (dirname == NULL) {
 647                 goto fail;
 648         }
 649
 650         if (!directory_create_or_exist(dirname, geteuid(), 0700)) {
 651                 status = map_nt_error_from_unix(errno);
 652                 DEBUG(0,(__location__ ": Failed to create stream pipe directory %s - %s\n",
 653                          dirname, nt_errstr(status)));
 654                 goto fail;
 655         }
 656
 657         if (strncmp(pipe_name, "\\pipe\\", 6) == 0) {
 658                 pipe_name += 6;
 659         }
 660
 661         pipe_sock->pipe_path = talloc_asprintf(pipe_sock, "%s/%s", dirname,
 662                                                pipe_name);
 663         if (pipe_sock->pipe_path == NULL) {
 664                 goto fail;
 665         }
 666
 667         talloc_free(dirname);
 668
 669         pipe_sock->ops          = stream_ops;
 670         pipe_sock->private_data = talloc_reference(pipe_sock, private_data);
 671
 672         status = stream_setup_socket(event_context,
 673                                      lp_ctx,
 674                                      model_ops,
 675                                      &named_pipe_stream_ops,
 676                                      "unix",
 677                                      pipe_sock->pipe_path,
 678                                      NULL,
 679                                      NULL,
 680                                      pipe_sock);
 681         if (!NT_STATUS_IS_OK(status)) {
 682                 goto fail;
 683         }
 684         return NT_STATUS_OK;
 685
 686  fail:
 687         talloc_free(pipe_sock);
 688         return status;
 689 }