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 "lib/socket/socket.h"
  25 #include "smbd/service.h"
  26 #include "param/param.h"
  27 #include "auth/session.h"
  28 #include "auth/auth_sam_reply.h"
  29 #include "lib/stream/packet.h"
  30 #include "librpc/gen_ndr/ndr_named_pipe_auth.h"
  31 #include "system/passwd.h"
  32 #include "libcli/raw/smb.h"
  33 #include "auth/credentials/credentials.h"
  34 #include "auth/credentials/credentials_krb5.h"
  35 #include <gssapi/gssapi.h>
  36
  37 struct named_pipe_socket {
  38         const char *pipe_name;
  39         const char *pipe_path;
  40         const struct stream_server_ops *ops;
  41         void *private_data;
  42 };
  43
  44 struct named_pipe_connection {
  45         struct stream_connection *connection;
  46         struct packet_context *packet;
  47         const struct named_pipe_socket *pipe_sock;
  48         NTSTATUS status;
  49 };
  50
  51 static void named_pipe_handover_connection(void *private_data)
  52 {
  53         struct named_pipe_connection *pipe_conn = talloc_get_type(
  54                 private_data, struct named_pipe_connection);
  55         struct stream_connection *conn = pipe_conn->connection;
  56
  57         TEVENT_FD_NOT_WRITEABLE(conn->event.fde);
  58
  59         packet_set_socket(pipe_conn->packet, NULL);
  60         packet_set_event_context(pipe_conn->packet, NULL);
  61         packet_set_fde(pipe_conn->packet, NULL);
  62         TALLOC_FREE(pipe_conn->packet);
  63
  64         if (!NT_STATUS_IS_OK(pipe_conn->status)) {
  65                 stream_terminate_connection(conn, nt_errstr(pipe_conn->status));
  66                 return;
  67         }
  68
  69         /*
  70          * remove the named_pipe layer together with its packet layer
  71          */
  72         conn->ops               = pipe_conn->pipe_sock->ops;
  73         conn->private_data      = pipe_conn->pipe_sock->private_data;
  74         talloc_unlink(conn, pipe_conn);
  75
  76         /* we're now ready to start receiving events on this stream */
  77         TEVENT_FD_READABLE(conn->event.fde);
  78
  79         /*
  80          * hand over to the real pipe implementation,
  81          * now that we have setup the transport session_info
  82          */
  83         conn->ops->accept_connection(conn);
  84
  85         DEBUG(10,("named_pipe_handover_connection[%s]: succeeded\n",
  86               conn->ops->name));
  87 }
  88
  89 static NTSTATUS named_pipe_recv_auth_request(void *private_data,
  90                                              DATA_BLOB req_blob)
  91 {
  92         struct named_pipe_connection *pipe_conn = talloc_get_type(
  93                 private_data, struct named_pipe_connection);
  94         struct stream_connection *conn = pipe_conn->connection;
  95         enum ndr_err_code ndr_err;
  96         struct named_pipe_auth_req req;
  97         union netr_Validation val;
  98         struct auth_serversupplied_info *server_info;
  99         struct named_pipe_auth_rep rep;
 100         DATA_BLOB rep_blob;
 101         NTSTATUS status;
 102
 103         /*
 104          * make sure nothing happens on the socket untill the
 105          * real implemenation takes over
 106          */
 107         packet_recv_disable(pipe_conn->packet);
 108
 109         /*
 110          * TODO: check it's a root (uid == 0) pipe
 111          */
 112
 113         ZERO_STRUCT(rep);
 114         rep.level = 0;
 115         rep.status = NT_STATUS_INTERNAL_ERROR;
 116
 117         DEBUG(10,("named_pipe_auth: req_blob.length[%u]\n",
 118                   (unsigned int)req_blob.length));
 119         dump_data(11, req_blob.data, req_blob.length);
 120
 121         /* parse the passed credentials */
 122         ndr_err = ndr_pull_struct_blob_all(
 123                         &req_blob,
 124                         pipe_conn,
 125                         lp_iconv_convenience(conn->lp_ctx),
 126                         &req,
 127                         (ndr_pull_flags_fn_t)ndr_pull_named_pipe_auth_req);
 128         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 129                 rep.status = ndr_map_error2ntstatus(ndr_err);
 130                 DEBUG(2, ("Could not unmarshall named_pipe_auth_req: %s\n",
 131                           nt_errstr(rep.status)));
 132                 goto reply;
 133         }
 134
 135         if (DEBUGLVL(10)) {
 136                 NDR_PRINT_DEBUG(named_pipe_auth_req, &req);
 137         }
 138
 139         if (strcmp(NAMED_PIPE_AUTH_MAGIC, req.magic) != 0) {
 140                 DEBUG(2, ("named_pipe_auth_req: invalid magic '%s' != %s\n",
 141                           req.magic, NAMED_PIPE_AUTH_MAGIC));
 142                 rep.status = NT_STATUS_INVALID_PARAMETER;
 143                 goto reply;
 144         }
 145
 146         switch (req.level) {
 147         case 0:
 148                 /*
 149                  * anon connection, we don't create a session info
 150                  * and leave it NULL
 151                  */
 152                 rep.level = 0;
 153                 rep.status = NT_STATUS_OK;
 154                 break;
 155         case 1:
 156                 val.sam3 = &req.info.info1;
 157
 158                 rep.level = 1;
 159                 rep.status = make_server_info_netlogon_validation(pipe_conn,
 160                                                                   "TODO",
 161                                                                   3, &val,
 162                                                                   &server_info);
 163                 if (!NT_STATUS_IS_OK(rep.status)) {
 164                         DEBUG(2, ("make_server_info_netlogon_validation returned "
 165                                   "%s\n", nt_errstr(rep.status)));
 166                         goto reply;
 167                 }
 168
 169                 /* setup the session_info on the connection */
 170                 rep.status = auth_generate_session_info(conn,
 171                                                         conn->event.ctx,
 172                                                         conn->lp_ctx,
 173                                                         server_info,
 174                                                         &conn->session_info);
 175                 if (!NT_STATUS_IS_OK(rep.status)) {
 176                         DEBUG(2, ("auth_generate_session_info failed: %s\n",
 177                                   nt_errstr(rep.status)));
 178                         goto reply;
 179                 }
 180
 181                 break;
 182         case 2:
 183                 rep.level = 2;
 184                 rep.info.info2.file_type = FILE_TYPE_MESSAGE_MODE_PIPE;
 185                 rep.info.info2.device_state = 0xff | 0x0400 | 0x0100;
 186                 rep.info.info2.allocation_size = 4096;
 187
 188                 if (!req.info.info2.sam_info3) {
 189                         /*
 190                          * anon connection, we don't create a session info
 191                          * and leave it NULL
 192                          */
 193                         rep.status = NT_STATUS_OK;
 194                         break;
 195                 }
 196
 197                 val.sam3 = req.info.info2.sam_info3;
 198
 199                 rep.status = make_server_info_netlogon_validation(pipe_conn,
 200                                                 val.sam3->base.account_name.string,
 201                                                 3, &val, &server_info);
 202                 if (!NT_STATUS_IS_OK(rep.status)) {
 203                         DEBUG(2, ("make_server_info_netlogon_validation returned "
 204                                   "%s\n", nt_errstr(rep.status)));
 205                         goto reply;
 206                 }
 207
 208                 /* setup the session_info on the connection */
 209                 rep.status = auth_generate_session_info(conn,
 210                                                         conn->event.ctx,
 211                                                         conn->lp_ctx,
 212                                                         server_info,
 213                                                         &conn->session_info);
 214                 if (!NT_STATUS_IS_OK(rep.status)) {
 215                         DEBUG(2, ("auth_generate_session_info failed: %s\n",
 216                                   nt_errstr(rep.status)));
 217                         goto reply;
 218                 }
 219
 220                 conn->session_info->session_key = data_blob_const(req.info.info2.session_key,
 221                                                         req.info.info2.session_key_length);
 222                 talloc_steal(conn->session_info, req.info.info2.session_key);
 223
 224                 break;
 225         case 3:
 226                 rep.level = 3;
 227                 rep.info.info3.file_type = FILE_TYPE_MESSAGE_MODE_PIPE;
 228                 rep.info.info3.device_state = 0xff | 0x0400 | 0x0100;
 229                 rep.info.info3.allocation_size = 4096;
 230
 231                 if (!req.info.info3.sam_info3) {
 232                         /*
 233                          * anon connection, we don't create a session info
 234                          * and leave it NULL
 235                          */
 236                         rep.status = NT_STATUS_OK;
 237                         break;
 238                 }
 239
 240                 val.sam3 = req.info.info3.sam_info3;
 241
 242                 rep.status = make_server_info_netlogon_validation(pipe_conn,
 243                                                 val.sam3->base.account_name.string,
 244                                                 3, &val, &server_info);
 245                 if (!NT_STATUS_IS_OK(rep.status)) {
 246                         DEBUG(2, ("make_server_info_netlogon_validation returned "
 247                                   "%s\n", nt_errstr(rep.status)));
 248                         goto reply;
 249                 }
 250
 251                 /* setup the session_info on the connection */
 252                 rep.status = auth_generate_session_info(conn,
 253                                                         conn->event.ctx,
 254                                                         conn->lp_ctx,
 255                                                         server_info,
 256                                                         &conn->session_info);
 257                 if (!NT_STATUS_IS_OK(rep.status)) {
 258                         DEBUG(2, ("auth_generate_session_info failed: %s\n",
 259                                   nt_errstr(rep.status)));
 260                         goto reply;
 261                 }
 262
 263                 if (req.info.info3.gssapi_delegated_creds_length) {
 264                         OM_uint32 minor_status;
 265                         gss_buffer_desc cred_token;
 266                         gss_cred_id_t cred_handle;
 267                         int ret;
 268
 269                         DEBUG(10, ("named_pipe_auth: delegated credentials supplied by client\n"));
 270
 271                         cred_token.value = req.info.info3.gssapi_delegated_creds;
 272                         cred_token.length = req.info.info3.gssapi_delegated_creds_length;
 273
 274                         ret = gss_import_cred(&minor_status,
 275                                                &cred_token,
 276                                                &cred_handle);
 277                         if (ret != GSS_S_COMPLETE) {
 278                                 rep.status = NT_STATUS_INTERNAL_ERROR;
 279                                 goto reply;
 280                         }
 281
 282                         conn->session_info->credentials = cli_credentials_init(conn->session_info);
 283                         if (!conn->session_info->credentials) {
 284                                 rep.status = NT_STATUS_NO_MEMORY;
 285                                 goto reply;
 286                         }
 287
 288                         cli_credentials_set_conf(conn->session_info->credentials,
 289                                                  conn->lp_ctx);
 290                         /* Just so we don't segfault trying to get at a username */
 291                         cli_credentials_set_anonymous(conn->session_info->credentials);
 292
 293                         ret = cli_credentials_set_client_gss_creds(conn->session_info->credentials,
 294                                                                    conn->event.ctx,
 295                                                                    conn->lp_ctx,
 296                                                                    cred_handle,
 297                                                                    CRED_SPECIFIED);
 298                         if (ret) {
 299                                 rep.status = NT_STATUS_INTERNAL_ERROR;
 300                                 goto reply;
 301                         }
 302
 303                         /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
 304                         cli_credentials_set_kerberos_state(conn->session_info->credentials,
 305                                                            CRED_MUST_USE_KERBEROS);
 306                 }
 307
 308                 conn->session_info->session_key = data_blob_const(req.info.info3.session_key,
 309                                                         req.info.info3.session_key_length);
 310                 talloc_steal(conn->session_info, req.info.info3.session_key);
 311
 312                 break;
 313         default:
 314                 DEBUG(2, ("named_pipe_auth_req: unknown level %u\n",
 315                           req.level));
 316                 rep.level = 0;
 317                 rep.status = NT_STATUS_INVALID_LEVEL;
 318                 goto reply;
 319         }
 320
 321 reply:
 322         /* create the output */
 323         ndr_err = ndr_push_struct_blob(&rep_blob, pipe_conn,
 324                         lp_iconv_convenience(conn->lp_ctx),
 325                         &rep,
 326                         (ndr_push_flags_fn_t)ndr_push_named_pipe_auth_rep);
 327         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 328                 status = ndr_map_error2ntstatus(ndr_err);
 329                 DEBUG(2, ("Could not marshall named_pipe_auth_rep: %s\n",
 330                           nt_errstr(status)));
 331                 return status;
 332         }
 333
 334         DEBUG(10,("named_pipe_auth reply[%u]\n", (unsigned)rep_blob.length));
 335         dump_data(11, rep_blob.data, rep_blob.length);
 336         if (DEBUGLVL(10)) {
 337                 NDR_PRINT_DEBUG(named_pipe_auth_rep, &rep);
 338         }
 339
 340         pipe_conn->status = rep.status;
 341         status = packet_send_callback(pipe_conn->packet, rep_blob,
 342                                       named_pipe_handover_connection,
 343                                       pipe_conn);
 344         if (!NT_STATUS_IS_OK(status)) {
 345                 DEBUG(0, ("packet_send_callback returned %s\n",
 346                           nt_errstr(status)));
 347                 return status;
 348         }
 349
 350         return NT_STATUS_OK;
 351 }
 352
 353 /*
 354   called when a pipe socket becomes readable
 355 */
 356 static void named_pipe_recv(struct stream_connection *conn, uint16_t flags)
 357 {
 358         struct named_pipe_connection *pipe_conn = talloc_get_type(
 359                 conn->private_data, struct named_pipe_connection);
 360
 361         DEBUG(10,("named_pipe_recv\n"));
 362
 363         packet_recv(pipe_conn->packet);
 364 }
 365
 366 /*
 367   called when a pipe socket becomes writable
 368 */
 369 static void named_pipe_send(struct stream_connection *conn, uint16_t flags)
 370 {
 371         struct named_pipe_connection *pipe_conn = talloc_get_type(
 372                 conn->private_data, struct named_pipe_connection);
 373
 374         packet_queue_run(pipe_conn->packet);
 375 }
 376
 377 /*
 378   handle socket recv errors
 379 */
 380 static void named_pipe_recv_error(void *private_data, NTSTATUS status)
 381 {
 382         struct named_pipe_connection *pipe_conn = talloc_get_type(
 383                 private_data, struct named_pipe_connection);
 384
 385         stream_terminate_connection(pipe_conn->connection, nt_errstr(status));
 386 }
 387
 388 static NTSTATUS named_pipe_full_request(void *private_data, DATA_BLOB blob, size_t *size)
 389 {
 390         if (blob.length < 8) {
 391                 return STATUS_MORE_ENTRIES;
 392         }
 393
 394         if (memcmp(NAMED_PIPE_AUTH_MAGIC, &blob.data[4], 4) != 0) {
 395                 DEBUG(0,("named_pipe_full_request: wrong protocol\n"));
 396                 *size = blob.length;
 397                 /* the error will be handled in named_pipe_recv_auth_request */
 398                 return NT_STATUS_OK;
 399         }
 400
 401         *size = 4 + RIVAL(blob.data, 0);
 402         if (*size > blob.length) {
 403                 return STATUS_MORE_ENTRIES;
 404         }
 405
 406         return NT_STATUS_OK;
 407 }
 408
 409 static void named_pipe_accept(struct stream_connection *conn)
 410 {
 411         struct named_pipe_socket *pipe_sock = talloc_get_type(
 412                 conn->private_data, struct named_pipe_socket);
 413         struct named_pipe_connection *pipe_conn;
 414
 415         DEBUG(5,("named_pipe_accept\n"));
 416
 417         pipe_conn = talloc_zero(conn, struct named_pipe_connection);
 418         if (!pipe_conn) {
 419                 stream_terminate_connection(conn, "out of memory");
 420                 return;
 421         }
 422
 423         pipe_conn->packet = packet_init(pipe_conn);
 424         if (!pipe_conn->packet) {
 425                 stream_terminate_connection(conn, "out of memory");
 426                 return;
 427         }
 428         packet_set_private(pipe_conn->packet, pipe_conn);
 429         packet_set_socket(pipe_conn->packet, conn->socket);
 430         packet_set_callback(pipe_conn->packet, named_pipe_recv_auth_request);
 431         packet_set_full_request(pipe_conn->packet, named_pipe_full_request);
 432         packet_set_error_handler(pipe_conn->packet, named_pipe_recv_error);
 433         packet_set_event_context(pipe_conn->packet, conn->event.ctx);
 434         packet_set_fde(pipe_conn->packet, conn->event.fde);
 435         packet_set_serialise(pipe_conn->packet);
 436         packet_set_initial_read(pipe_conn->packet, 8);
 437
 438         pipe_conn->pipe_sock = pipe_sock;
 439
 440         pipe_conn->connection = conn;
 441         conn->private_data = pipe_conn;
 442 }
 443
 444 static const struct stream_server_ops named_pipe_stream_ops = {
 445         .name                   = "named_pipe",
 446         .accept_connection      = named_pipe_accept,
 447         .recv_handler           = named_pipe_recv,
 448         .send_handler           = named_pipe_send,
 449 };
 450
 451 NTSTATUS stream_setup_named_pipe(struct tevent_context *event_context,
 452                                  struct loadparm_context *lp_ctx,
 453                                  const struct model_ops *model_ops,
 454                                  const struct stream_server_ops *stream_ops,
 455                                  const char *pipe_name,
 456                                  void *private_data)
 457 {
 458         char *dirname;
 459         struct named_pipe_socket *pipe_sock;
 460         NTSTATUS status = NT_STATUS_NO_MEMORY;;
 461
 462         pipe_sock = talloc(event_context, struct named_pipe_socket);
 463         if (pipe_sock == NULL) {
 464                 goto fail;
 465         }
 466
 467         /* remember the details about the pipe */
 468         pipe_sock->pipe_name    = talloc_strdup(pipe_sock, pipe_name);
 469         if (pipe_sock->pipe_name == NULL) {
 470                 goto fail;
 471         }
 472
 473         dirname = talloc_asprintf(pipe_sock, "%s/np", lp_ncalrpc_dir(lp_ctx));
 474         if (dirname == NULL) {
 475                 goto fail;
 476         }
 477
 478         if (!directory_create_or_exist(dirname, geteuid(), 0700)) {
 479                 status = map_nt_error_from_unix(errno);
 480                 goto fail;
 481         }
 482
 483         if (strncmp(pipe_name, "\\pipe\\", 6) == 0) {
 484                 pipe_name += 6;
 485         }
 486
 487         pipe_sock->pipe_path = talloc_asprintf(pipe_sock, "%s/%s", dirname,
 488                                                pipe_name);
 489         if (pipe_sock->pipe_path == NULL) {
 490                 goto fail;
 491         }
 492
 493         talloc_free(dirname);
 494
 495         pipe_sock->ops          = stream_ops;
 496         pipe_sock->private_data = talloc_reference(pipe_sock, private_data);
 497
 498         status = stream_setup_socket(event_context,
 499                                      lp_ctx,
 500                                      model_ops,
 501                                      &named_pipe_stream_ops,
 502                                      "unix",
 503                                      pipe_sock->pipe_path,
 504                                      NULL,
 505                                      NULL,
 506                                      pipe_sock);
 507         if (!NT_STATUS_IS_OK(status)) {
 508                 goto fail;
 509         }
 510         return NT_STATUS_OK;
 511
 512  fail:
 513         talloc_free(pipe_sock);
 514         return status;
 515 }