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