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 "lib/stream/packet.h"
  29 #include "librpc/gen_ndr/ndr_named_pipe_auth.h"
  30 #include "system/passwd.h"
  31
  32 struct named_pipe_socket {
  33         const char *pipe_name;
  34         const char *pipe_path;
  35         const struct stream_server_ops *ops;
  36         void *private_data;
  37 };
  38
  39 struct named_pipe_connection {
  40         struct stream_connection *connection;
  41         struct packet_context *packet;
  42         const struct named_pipe_socket *pipe_sock;
  43         NTSTATUS status;
  44 };
  45
  46 static void named_pipe_handover_connection(void *private_data)
  47 {
  48         struct named_pipe_connection *pipe_conn = talloc_get_type(
  49                 private_data, struct named_pipe_connection);
  50         struct stream_connection *conn = pipe_conn->connection;
  51
  52         TEVENT_FD_NOT_WRITEABLE(conn->event.fde);
  53
  54         if (!NT_STATUS_IS_OK(pipe_conn->status)) {
  55                 stream_terminate_connection(conn, nt_errstr(pipe_conn->status));
  56                 return;
  57         }
  58
  59         /*
  60          * remove the named_pipe layer together with its packet layer
  61          */
  62         conn->ops       = pipe_conn->pipe_sock->ops;
  63         conn->private   = pipe_conn->pipe_sock->private_data;
  64         talloc_free(pipe_conn);
  65
  66         /* we're now ready to start receiving events on this stream */
  67         TEVENT_FD_READABLE(conn->event.fde);
  68
  69         /*
  70          * hand over to the real pipe implementation,
  71          * now that we have setup the transport session_info
  72          */
  73         conn->ops->accept_connection(conn);
  74
  75         DEBUG(10,("named_pipe_handover_connection[%s]: succeeded\n",
  76               conn->ops->name));
  77 }
  78
  79 static NTSTATUS named_pipe_recv_auth_request(void *private_data,
  80                                              DATA_BLOB req_blob)
  81 {
  82         struct named_pipe_connection *pipe_conn = talloc_get_type(
  83                 private_data, struct named_pipe_connection);
  84         struct stream_connection *conn = pipe_conn->connection;
  85         enum ndr_err_code ndr_err;
  86         struct named_pipe_auth_req req;
  87         union netr_Validation val;
  88         struct auth_serversupplied_info *server_info;
  89         struct named_pipe_auth_rep rep;
  90         DATA_BLOB rep_blob;
  91         NTSTATUS status;
  92
  93         /*
  94          * make sure nothing happens on the socket untill the
  95          * real implemenation takes over
  96          */
  97         packet_recv_disable(pipe_conn->packet);
  98
  99         /*
 100          * TODO: check it's a root (uid == 0) pipe
 101          */
 102
 103         ZERO_STRUCT(rep);
 104         rep.level = 0;
 105         rep.status = NT_STATUS_INTERNAL_ERROR;
 106
 107         DEBUG(10,("named_pipe_auth: req_blob.length[%u]\n",
 108                   (unsigned int)req_blob.length));
 109         dump_data(10, req_blob.data, req_blob.length);
 110
 111         /* parse the passed credentials */
 112         ndr_err = ndr_pull_struct_blob_all(
 113                         &req_blob,
 114                         pipe_conn,
 115                         lp_iconv_convenience(conn->lp_ctx),
 116                         &req,
 117                         (ndr_pull_flags_fn_t)ndr_pull_named_pipe_auth_req);
 118         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 119                 rep.status = ndr_map_error2ntstatus(ndr_err);
 120                 DEBUG(2, ("Could not unmarshall named_pipe_auth_req: %s\n",
 121                           nt_errstr(rep.status)));
 122                 goto reply;
 123         }
 124
 125         if (strcmp(NAMED_PIPE_AUTH_MAGIC, req.magic) != 0) {
 126                 DEBUG(2, ("named_pipe_auth_req: invalid magic '%s' != %s\n",
 127                           req.magic, NAMED_PIPE_AUTH_MAGIC));
 128                 rep.status = NT_STATUS_INVALID_PARAMETER;
 129                 goto reply;
 130         }
 131
 132         switch (req.level) {
 133         case 0:
 134                 /*
 135                  * anon connection, we don't create a session info
 136                  * and leave it NULL
 137                  */
 138                 rep.level = 0;
 139                 rep.status = NT_STATUS_OK;
 140                 break;
 141         case 1:
 142                 val.sam3 = &req.info.info1;
 143
 144                 rep.level = 1;
 145                 rep.status = make_server_info_netlogon_validation(pipe_conn,
 146                                                                   "TODO",
 147                                                                   3, &val,
 148                                                                   &server_info);
 149                 if (!NT_STATUS_IS_OK(rep.status)) {
 150                         DEBUG(2, ("make_server_info_netlogon_validation returned "
 151                                   "%s\n", nt_errstr(rep.status)));
 152                         goto reply;
 153                 }
 154
 155                 /* setup the session_info on the connection */
 156                 rep.status = auth_generate_session_info(conn,
 157                                                         conn->event.ctx,
 158                                                         conn->lp_ctx,
 159                                                         server_info,
 160                                                         &conn->session_info);
 161                 if (!NT_STATUS_IS_OK(rep.status)) {
 162                         DEBUG(2, ("auth_generate_session_info failed: %s\n",
 163                                   nt_errstr(rep.status)));
 164                         goto reply;
 165                 }
 166
 167                 break;
 168         default:
 169                 DEBUG(2, ("named_pipe_auth_req: unknown level %u\n",
 170                           req.level));
 171                 rep.level = 0;
 172                 rep.status = NT_STATUS_INVALID_LEVEL;
 173                 goto reply;
 174         }
 175
 176 reply:
 177         /* create the output */
 178         ndr_err = ndr_push_struct_blob(&rep_blob, pipe_conn,
 179                         lp_iconv_convenience(conn->lp_ctx),
 180                         &rep,
 181                         (ndr_push_flags_fn_t)ndr_push_named_pipe_auth_rep);
 182         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 183                 status = ndr_map_error2ntstatus(ndr_err);
 184                 DEBUG(2, ("Could not marshall named_pipe_auth_rep: %s\n",
 185                           nt_errstr(status)));
 186                 return status;
 187         }
 188
 189         pipe_conn->status = rep.status;
 190
 191         DEBUG(10,("named_pipe_auth reply[%u]\n", rep_blob.length));
 192         dump_data(10, rep_blob.data, rep_blob.length);
 193         status = packet_send_callback(pipe_conn->packet, rep_blob,
 194                                       named_pipe_handover_connection,
 195                                       pipe_conn);
 196         if (!NT_STATUS_IS_OK(status)) {
 197                 DEBUG(0, ("packet_send_callback returned %s\n",
 198                           nt_errstr(status)));
 199                 return status;
 200         }
 201
 202         return NT_STATUS_OK;
 203 }
 204
 205 /*
 206   called when a pipe socket becomes readable
 207 */
 208 static void named_pipe_recv(struct stream_connection *conn, uint16_t flags)
 209 {
 210         struct named_pipe_connection *pipe_conn = talloc_get_type(
 211                 conn->private, struct named_pipe_connection);
 212
 213         DEBUG(10,("named_pipe_recv\n"));
 214
 215         packet_recv(pipe_conn->packet);
 216 }
 217
 218 /*
 219   called when a pipe socket becomes writable
 220 */
 221 static void named_pipe_send(struct stream_connection *conn, uint16_t flags)
 222 {
 223         struct named_pipe_connection *pipe_conn = talloc_get_type(
 224                 conn->private, struct named_pipe_connection);
 225
 226         packet_queue_run(pipe_conn->packet);
 227 }
 228
 229 /*
 230   handle socket recv errors
 231 */
 232 static void named_pipe_recv_error(void *private_data, NTSTATUS status)
 233 {
 234         struct named_pipe_connection *pipe_conn = talloc_get_type(
 235                 private_data, struct named_pipe_connection);
 236
 237         stream_terminate_connection(pipe_conn->connection, nt_errstr(status));
 238 }
 239
 240 static NTSTATUS named_pipe_full_request(void *private, DATA_BLOB blob, size_t *size)
 241 {
 242         if (blob.length < 8) {
 243                 return STATUS_MORE_ENTRIES;
 244         }
 245
 246         if (memcmp(NAMED_PIPE_AUTH_MAGIC, &blob.data[4], 4) != 0) {
 247                 DEBUG(0,("named_pipe_full_request: wrong protocol\n"));
 248                 *size = blob.length;
 249                 /* the error will be handled in named_pipe_recv_auth_request */
 250                 return NT_STATUS_OK;
 251         }
 252
 253         *size = 4 + RIVAL(blob.data, 0);
 254         if (*size > blob.length) {
 255                 return STATUS_MORE_ENTRIES;
 256         }
 257
 258         return NT_STATUS_OK;
 259 }
 260
 261 static void named_pipe_accept(struct stream_connection *conn)
 262 {
 263         struct named_pipe_socket *pipe_sock = talloc_get_type(
 264                 conn->private, struct named_pipe_socket);
 265         struct named_pipe_connection *pipe_conn;
 266
 267         DEBUG(5,("named_pipe_accept\n"));
 268
 269         pipe_conn = talloc_zero(conn, struct named_pipe_connection);
 270         if (!pipe_conn) {
 271                 stream_terminate_connection(conn, "out of memory");
 272                 return;
 273         }
 274
 275         pipe_conn->packet = packet_init(pipe_conn);
 276         if (!pipe_conn->packet) {
 277                 stream_terminate_connection(conn, "out of memory");
 278                 return;
 279         }
 280         packet_set_private(pipe_conn->packet, pipe_conn);
 281         packet_set_socket(pipe_conn->packet, conn->socket);
 282         packet_set_callback(pipe_conn->packet, named_pipe_recv_auth_request);
 283         packet_set_full_request(pipe_conn->packet, named_pipe_full_request);
 284         packet_set_error_handler(pipe_conn->packet, named_pipe_recv_error);
 285         packet_set_event_context(pipe_conn->packet, conn->event.ctx);
 286         packet_set_fde(pipe_conn->packet, conn->event.fde);
 287         packet_set_serialise(pipe_conn->packet);
 288         packet_set_initial_read(pipe_conn->packet, 8);
 289
 290         pipe_conn->pipe_sock = pipe_sock;
 291
 292         pipe_conn->connection = conn;
 293         conn->private = pipe_conn;
 294 }
 295
 296 static const struct stream_server_ops named_pipe_stream_ops = {
 297         .name                   = "named_pipe",
 298         .accept_connection      = named_pipe_accept,
 299         .recv_handler           = named_pipe_recv,
 300         .send_handler           = named_pipe_send,
 301 };
 302
 303 NTSTATUS stream_setup_named_pipe(struct tevent_context *event_context,
 304                                  struct loadparm_context *lp_ctx,
 305                                  const struct model_ops *model_ops,
 306                                  const struct stream_server_ops *stream_ops,
 307                                  const char *pipe_name,
 308                                  void *private_data)
 309 {
 310         char *dirname;
 311         struct named_pipe_socket *pipe_sock;
 312         NTSTATUS status = NT_STATUS_NO_MEMORY;;
 313
 314         pipe_sock = talloc(event_context, struct named_pipe_socket);
 315         if (pipe_sock == NULL) {
 316                 goto fail;
 317         }
 318
 319         /* remember the details about the pipe */
 320         pipe_sock->pipe_name    = talloc_strdup(pipe_sock, pipe_name);
 321         if (pipe_sock->pipe_name == NULL) {
 322                 goto fail;
 323         }
 324
 325         dirname = talloc_asprintf(pipe_sock, "%s/np", lp_ncalrpc_dir(lp_ctx));
 326         if (dirname == NULL) {
 327                 goto fail;
 328         }
 329
 330         if (!directory_create_or_exist(dirname, geteuid(), 0700)) {
 331                 status = map_nt_error_from_unix(errno);
 332                 goto fail;
 333         }
 334
 335         if (strncmp(pipe_name, "\\pipe\\", 6) == 0) {
 336                 pipe_name += 6;
 337         }
 338
 339         pipe_sock->pipe_path = talloc_asprintf(pipe_sock, "%s/%s", dirname,
 340                                                pipe_name);
 341         if (pipe_sock->pipe_path == NULL) {
 342                 goto fail;
 343         }
 344
 345         talloc_free(dirname);
 346
 347         pipe_sock->ops          = stream_ops;
 348         pipe_sock->private_data = talloc_reference(pipe_sock, private_data);
 349
 350         status = stream_setup_socket(event_context,
 351                                      lp_ctx,
 352                                      model_ops,
 353                                      &named_pipe_stream_ops,
 354                                      "unix",
 355                                      pipe_sock->pipe_path,
 356                                      NULL,
 357                                      NULL,
 358                                      pipe_sock);
 359         if (!NT_STATUS_IS_OK(status)) {
 360                 goto fail;
 361         }
 362         return NT_STATUS_OK;
 363
 364  fail:
 365         talloc_free(pipe_sock);
 366         return status;
 367 }