source4/libcli/smb_composite/connect.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Andrew Tridgell 2005
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20 /*
  21   a composite API for making a full SMB connection
  22 */
  23
  24 #include "includes.h"
  25 #include "libcli/raw/libcliraw.h"
  26 #include "libcli/composite/composite.h"
  27 #include "libcli/smb_composite/smb_composite.h"
  28 #include "lib/events/events.h"
  29 #include "libcli/nbt/libnbt.h"
  30
  31 /* the stages of this call */
  32 enum connect_stage {CONNECT_RESOLVE,
  33                     CONNECT_SOCKET,
  34                     CONNECT_SESSION_REQUEST,
  35                     CONNECT_NEGPROT,
  36                     CONNECT_SESSION_SETUP,
  37                     CONNECT_SESSION_SETUP_ANON,
  38                     CONNECT_TCON};
  39
  40 struct connect_state {
  41         enum connect_stage stage;
  42         struct smbcli_socket *sock;
  43         struct smbcli_transport *transport;
  44         struct smbcli_session *session;
  45         struct smb_composite_connect *io;
  46         union smb_tcon *io_tcon;
  47         struct smb_composite_sesssetup *io_setup;
  48         struct smbcli_request *req;
  49         struct composite_context *creq;
  50 };
  51
  52
  53 static void request_handler(struct smbcli_request *);
  54 static void composite_handler(struct composite_context *);
  55
  56 /*
  57   setup a negprot send
  58 */
  59 static NTSTATUS connect_send_negprot(struct composite_context *c,
  60                                      struct smb_composite_connect *io)
  61 {
  62         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
  63
  64         state->req = smb_raw_negotiate_send(state->transport, lp_maxprotocol());
  65         NT_STATUS_HAVE_NO_MEMORY(state->req);
  66
  67         state->req->async.fn = request_handler;
  68         state->req->async.private = c;
  69         state->stage = CONNECT_NEGPROT;
  70
  71         return NT_STATUS_OK;
  72 }
  73
  74
  75 /*
  76   a tree connect request has completed
  77 */
  78 static NTSTATUS connect_tcon(struct composite_context *c,
  79                              struct smb_composite_connect *io)
  80 {
  81         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
  82         NTSTATUS status;
  83
  84         status = smb_raw_tcon_recv(state->req, c, state->io_tcon);
  85         NT_STATUS_NOT_OK_RETURN(status);
  86
  87         io->out.tree->tid = state->io_tcon->tconx.out.tid;
  88         if (state->io_tcon->tconx.out.dev_type) {
  89                 io->out.tree->device = talloc_strdup(io->out.tree,
  90                                                      state->io_tcon->tconx.out.dev_type);
  91         }
  92         if (state->io_tcon->tconx.out.fs_type) {
  93                 io->out.tree->fs_type = talloc_strdup(io->out.tree,
  94                                                       state->io_tcon->tconx.out.fs_type);
  95         }
  96
  97         /* all done! */
  98         c->state = COMPOSITE_STATE_DONE;
  99
 100         return NT_STATUS_OK;
 101 }
 102
 103
 104 /*
 105   a session setup request with anonymous fallback has completed
 106 */
 107 static NTSTATUS connect_session_setup_anon(struct composite_context *c,
 108                                            struct smb_composite_connect *io)
 109 {
 110         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 111         NTSTATUS status;
 112
 113         status = smb_composite_sesssetup_recv(state->creq);
 114         NT_STATUS_NOT_OK_RETURN(status);
 115
 116         io->out.anonymous_fallback_done = True;
 117
 118         state->session->vuid = state->io_setup->out.vuid;
 119
 120         /* setup for a tconx */
 121         io->out.tree = smbcli_tree_init(state->session, state, True);
 122         NT_STATUS_HAVE_NO_MEMORY(io->out.tree);
 123
 124         state->io_tcon = talloc(c, union smb_tcon);
 125         NT_STATUS_HAVE_NO_MEMORY(state->io_tcon);
 126
 127         /* connect to a share using a tree connect */
 128         state->io_tcon->generic.level = RAW_TCON_TCONX;
 129         state->io_tcon->tconx.in.flags = 0;
 130         state->io_tcon->tconx.in.password = data_blob(NULL, 0);
 131
 132         state->io_tcon->tconx.in.path = talloc_asprintf(state->io_tcon,
 133                                                  "\\\\%s\\%s",
 134                                                  io->in.called_name,
 135                                                  io->in.service);
 136         NT_STATUS_HAVE_NO_MEMORY(state->io_tcon->tconx.in.path);
 137         if (!io->in.service_type) {
 138                 state->io_tcon->tconx.in.device = "?????";
 139         } else {
 140                 state->io_tcon->tconx.in.device = io->in.service_type;
 141         }
 142
 143         state->req = smb_raw_tcon_send(io->out.tree, state->io_tcon);
 144         NT_STATUS_HAVE_NO_MEMORY(state->req);
 145         if (state->req->state == SMBCLI_REQUEST_ERROR) {
 146                 return state->req->status;
 147         }
 148
 149         state->req->async.fn = request_handler;
 150         state->req->async.private = c;
 151         state->stage = CONNECT_TCON;
 152
 153         return NT_STATUS_OK;
 154 }
 155
 156 /*
 157   a session setup request has completed
 158 */
 159 static NTSTATUS connect_session_setup(struct composite_context *c,
 160                                       struct smb_composite_connect *io)
 161 {
 162         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 163         NTSTATUS status;
 164
 165         status = smb_composite_sesssetup_recv(state->creq);
 166
 167         if (!NT_STATUS_IS_OK(status) &&
 168             !cli_credentials_is_anonymous(state->io->in.credentials) &&
 169             io->in.fallback_to_anonymous) {
 170
 171                 state->io_setup->in.credentials = cli_credentials_init(state);
 172                 NT_STATUS_HAVE_NO_MEMORY(state->io_setup->in.credentials);
 173                 cli_credentials_set_conf(state->io_setup->in.credentials);
 174                 cli_credentials_set_anonymous(state->io_setup->in.credentials);
 175
 176                 /* If the preceding attempt was with extended security, we
 177                  * have been given a uid in the NTLMSSP_CHALLENGE reply. This
 178                  * would lead to an invalid uid in the anonymous fallback */
 179                 state->session->vuid = 0;
 180
 181                 state->creq = smb_composite_sesssetup_send(state->session,
 182                                                            state->io_setup);
 183                 NT_STATUS_HAVE_NO_MEMORY(state->creq);
 184                 if (state->creq->state == COMPOSITE_STATE_ERROR) {
 185                         return state->creq->status;
 186                 }
 187                 state->creq->async.fn = composite_handler;
 188                 state->creq->async.private_data = c;
 189                 state->stage = CONNECT_SESSION_SETUP_ANON;
 190
 191                 return NT_STATUS_OK;
 192         }
 193
 194         NT_STATUS_NOT_OK_RETURN(status);
 195
 196         state->session->vuid = state->io_setup->out.vuid;
 197
 198         /* setup for a tconx */
 199         io->out.tree = smbcli_tree_init(state->session, state, True);
 200         NT_STATUS_HAVE_NO_MEMORY(io->out.tree);
 201
 202         state->io_tcon = talloc(c, union smb_tcon);
 203         NT_STATUS_HAVE_NO_MEMORY(state->io_tcon);
 204
 205         /* connect to a share using a tree connect */
 206         state->io_tcon->generic.level = RAW_TCON_TCONX;
 207         state->io_tcon->tconx.in.flags = 0;
 208         state->io_tcon->tconx.in.password = data_blob(NULL, 0);
 209
 210         state->io_tcon->tconx.in.path = talloc_asprintf(state->io_tcon,
 211                                                  "\\\\%s\\%s",
 212                                                  io->in.called_name,
 213                                                  io->in.service);
 214         NT_STATUS_HAVE_NO_MEMORY(state->io_tcon->tconx.in.path);
 215         if (!io->in.service_type) {
 216                 state->io_tcon->tconx.in.device = "?????";
 217         } else {
 218                 state->io_tcon->tconx.in.device = io->in.service_type;
 219         }
 220
 221         state->req = smb_raw_tcon_send(io->out.tree, state->io_tcon);
 222         NT_STATUS_HAVE_NO_MEMORY(state->req);
 223         if (state->req->state == SMBCLI_REQUEST_ERROR) {
 224                 return state->req->status;
 225         }
 226
 227         state->req->async.fn = request_handler;
 228         state->req->async.private = c;
 229         state->stage = CONNECT_TCON;
 230
 231         return NT_STATUS_OK;
 232 }
 233
 234 /*
 235   a negprot request has completed
 236 */
 237 static NTSTATUS connect_negprot(struct composite_context *c,
 238                                 struct smb_composite_connect *io)
 239 {
 240         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 241         NTSTATUS status;
 242
 243         status = smb_raw_negotiate_recv(state->req);
 244         NT_STATUS_NOT_OK_RETURN(status);
 245
 246         /* next step is a session setup */
 247         state->session = smbcli_session_init(state->transport, state, True);
 248         NT_STATUS_HAVE_NO_MEMORY(state->session);
 249
 250         state->io_setup = talloc(c, struct smb_composite_sesssetup);
 251         NT_STATUS_HAVE_NO_MEMORY(state->io_setup);
 252
 253         /* prepare a session setup to establish a security context */
 254         state->io_setup->in.sesskey      = state->transport->negotiate.sesskey;
 255         state->io_setup->in.capabilities = state->transport->negotiate.capabilities;
 256         state->io_setup->in.credentials  = io->in.credentials;
 257         state->io_setup->in.workgroup    = io->in.workgroup;
 258
 259         state->creq = smb_composite_sesssetup_send(state->session, state->io_setup);
 260         NT_STATUS_HAVE_NO_MEMORY(state->creq);
 261         if (state->creq->state == COMPOSITE_STATE_ERROR) {
 262                 return state->creq->status;
 263         }
 264
 265         state->creq->async.fn = composite_handler;
 266         state->creq->async.private_data = c;
 267         state->stage = CONNECT_SESSION_SETUP;
 268
 269         return NT_STATUS_OK;
 270 }
 271
 272
 273 /*
 274   a session request operation has completed
 275 */
 276 static NTSTATUS connect_session_request(struct composite_context *c,
 277                                         struct smb_composite_connect *io)
 278 {
 279         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 280         NTSTATUS status;
 281
 282         status = smbcli_transport_connect_recv(state->req);
 283         NT_STATUS_NOT_OK_RETURN(status);
 284
 285         /* next step is a negprot */
 286         return connect_send_negprot(c, io);
 287 }
 288
 289 /*
 290   a socket connection operation has completed
 291 */
 292 static NTSTATUS connect_socket(struct composite_context *c,
 293                                struct smb_composite_connect *io)
 294 {
 295         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 296         NTSTATUS status;
 297         struct nbt_name calling, called;
 298
 299         status = smbcli_sock_connect_recv(state->creq, state, &state->sock);
 300         NT_STATUS_NOT_OK_RETURN(status);
 301
 302         /* the socket is up - we can initialise the smbcli transport layer */
 303         state->transport = smbcli_transport_init(state->sock, state, True);
 304         NT_STATUS_HAVE_NO_MEMORY(state->transport);
 305
 306         if (is_ipaddress(state->sock->hostname) &&
 307             (state->io->in.called_name != NULL)) {
 308                 /* If connecting to an IP address, we might want the real name
 309                  * of the host for later kerberos. The called name is a better
 310                  * approximation */
 311                 state->sock->hostname =
 312                         talloc_strdup(state->sock, io->in.called_name);
 313                 NT_STATUS_HAVE_NO_MEMORY(state->sock->hostname);
 314         }
 315
 316         make_nbt_name_client(&calling, cli_credentials_get_workstation(io->in.credentials));
 317
 318         nbt_choose_called_name(state, &called, io->in.called_name, NBT_NAME_SERVER);
 319
 320         /* we have a connected socket - next step is a session
 321            request, if needed. Port 445 doesn't need it, so it goes
 322            straight to the negprot */
 323         if (state->sock->port == 445) {
 324                 status = nbt_name_dup(state->transport, &called,
 325                                       &state->transport->called);
 326                 NT_STATUS_NOT_OK_RETURN(status);
 327                 return connect_send_negprot(c, io);
 328         }
 329
 330         state->req = smbcli_transport_connect_send(state->transport, &calling, &called);
 331         NT_STATUS_HAVE_NO_MEMORY(state->req);
 332
 333         state->req->async.fn = request_handler;
 334         state->req->async.private = c;
 335         state->stage = CONNECT_SESSION_REQUEST;
 336
 337         return NT_STATUS_OK;
 338 }
 339
 340
 341 /*
 342   called when name resolution is finished
 343 */
 344 static NTSTATUS connect_resolve(struct composite_context *c,
 345                                 struct smb_composite_connect *io)
 346 {
 347         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 348         NTSTATUS status;
 349         const char *address;
 350
 351         status = resolve_name_recv(state->creq, state, &address);
 352         NT_STATUS_NOT_OK_RETURN(status);
 353
 354         state->creq = smbcli_sock_connect_send(state, address, io->in.port,
 355                                                io->in.dest_host, c->event_ctx);
 356         NT_STATUS_HAVE_NO_MEMORY(state->creq);
 357
 358         state->stage = CONNECT_SOCKET;
 359         state->creq->async.private_data = c;
 360         state->creq->async.fn = composite_handler;
 361
 362         return NT_STATUS_OK;
 363 }
 364
 365
 366 /*
 367   handle and dispatch state transitions
 368 */
 369 static void state_handler(struct composite_context *c)
 370 {
 371         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 372
 373         switch (state->stage) {
 374         case CONNECT_RESOLVE:
 375                 c->status = connect_resolve(c, state->io);
 376                 break;
 377         case CONNECT_SOCKET:
 378                 c->status = connect_socket(c, state->io);
 379                 break;
 380         case CONNECT_SESSION_REQUEST:
 381                 c->status = connect_session_request(c, state->io);
 382                 break;
 383         case CONNECT_NEGPROT:
 384                 c->status = connect_negprot(c, state->io);
 385                 break;
 386         case CONNECT_SESSION_SETUP:
 387                 c->status = connect_session_setup(c, state->io);
 388                 break;
 389         case CONNECT_SESSION_SETUP_ANON:
 390                 c->status = connect_session_setup_anon(c, state->io);
 391                 break;
 392         case CONNECT_TCON:
 393                 c->status = connect_tcon(c, state->io);
 394                 break;
 395         }
 396
 397         if (!NT_STATUS_IS_OK(c->status)) {
 398                 c->state = COMPOSITE_STATE_ERROR;
 399         }
 400
 401         if (c->state >= COMPOSITE_STATE_DONE &&
 402             c->async.fn) {
 403                 c->async.fn(c);
 404         }
 405 }
 406
 407
 408 /*
 409   handler for completion of a smbcli_request sub-request
 410 */
 411 static void request_handler(struct smbcli_request *req)
 412 {
 413         struct composite_context *c = talloc_get_type(req->async.private,
 414                                                      struct composite_context);
 415         state_handler(c);
 416 }
 417
 418 /*
 419   handler for completion of a smbcli_composite sub-request
 420 */
 421 static void composite_handler(struct composite_context *creq)
 422 {
 423         struct composite_context *c = talloc_get_type(creq->async.private_data,
 424                                                      struct composite_context);
 425         state_handler(c);
 426 }
 427
 428 /*
 429   a function to establish a smbcli_tree from scratch
 430 */
 431 struct composite_context *smb_composite_connect_send(struct smb_composite_connect *io,
 432                                                      TALLOC_CTX *mem_ctx,
 433                                                      struct event_context *event_ctx)
 434 {
 435         struct composite_context *c;
 436         struct connect_state *state;
 437         struct nbt_name name;
 438
 439         c = talloc_zero(mem_ctx, struct composite_context);
 440         if (c == NULL) goto failed;
 441
 442         state = talloc(c, struct connect_state);
 443         if (state == NULL) goto failed;
 444
 445         if (event_ctx == NULL) {
 446                 event_ctx = event_context_init(mem_ctx);
 447         }
 448
 449         state->io = io;
 450
 451         c->state = COMPOSITE_STATE_IN_PROGRESS;
 452         c->event_ctx = talloc_reference(c, event_ctx);
 453         c->private_data = state;
 454
 455         state->stage = CONNECT_RESOLVE;
 456         make_nbt_name_server(&name, io->in.dest_host);
 457         state->creq = resolve_name_send(&name, c->event_ctx, lp_name_resolve_order());
 458
 459         if (state->creq == NULL) goto failed;
 460         state->creq->async.private_data = c;
 461         state->creq->async.fn = composite_handler;
 462
 463         return c;
 464 failed:
 465         talloc_free(c);
 466         return NULL;
 467 }
 468
 469 /*
 470   recv half of async composite connect code
 471 */
 472 NTSTATUS smb_composite_connect_recv(struct composite_context *c, TALLOC_CTX *mem_ctx)
 473 {
 474         NTSTATUS status;
 475
 476         status = composite_wait(c);
 477
 478         if (NT_STATUS_IS_OK(status)) {
 479                 struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 480                 talloc_steal(mem_ctx, state->io->out.tree);
 481         }
 482
 483         talloc_free(c);
 484         return status;
 485 }
 486
 487 /*
 488   sync version of smb_composite_connect
 489 */
 490 NTSTATUS smb_composite_connect(struct smb_composite_connect *io, TALLOC_CTX *mem_ctx,
 491                                struct event_context *ev)
 492 {
 493         struct composite_context *c = smb_composite_connect_send(io, mem_ctx, ev);
 494         return smb_composite_connect_recv(c, mem_ctx);
 495 }