source/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 3 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, see <http://www.gnu.org/licenses/>.
  18 */
  19 /*
  20   a composite API for making a full SMB connection
  21 */
  22
  23 #include "includes.h"
  24 #include "libcli/raw/libcliraw.h"
  25 #include "libcli/composite/composite.h"
  26 #include "libcli/smb_composite/smb_composite.h"
  27 #include "lib/events/events.h"
  28 #include "libcli/resolve/resolve.h"
  29 #include "auth/credentials/credentials.h"
  30 #include "librpc/gen_ndr/ndr_nbt.h"
  31 #include "param/param.h"
  32
  33 /* the stages of this call */
  34 enum connect_stage {CONNECT_RESOLVE,
  35                     CONNECT_SOCKET,
  36                     CONNECT_SESSION_REQUEST,
  37                     CONNECT_NEGPROT,
  38                     CONNECT_SESSION_SETUP,
  39                     CONNECT_SESSION_SETUP_ANON,
  40                     CONNECT_TCON};
  41
  42 struct connect_state {
  43         enum connect_stage stage;
  44         struct smbcli_socket *sock;
  45         struct smbcli_transport *transport;
  46         struct smbcli_session *session;
  47         struct smb_composite_connect *io;
  48         union smb_tcon *io_tcon;
  49         struct smb_composite_sesssetup *io_setup;
  50         struct smbcli_request *req;
  51         struct composite_context *creq;
  52 };
  53
  54
  55 static void request_handler(struct smbcli_request *);
  56 static void composite_handler(struct composite_context *);
  57
  58 /*
  59   setup a negprot send
  60 */
  61 static NTSTATUS connect_send_negprot(struct composite_context *c,
  62                                      struct smb_composite_connect *io)
  63 {
  64         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
  65
  66         state->req = smb_raw_negotiate_send(state->transport, lp_unicode(global_loadparm),
  67                                             lp_cli_maxprotocol(global_loadparm));
  68         NT_STATUS_HAVE_NO_MEMORY(state->req);
  69
  70         state->req->async.fn = request_handler;
  71         state->req->async.private = c;
  72         state->stage = CONNECT_NEGPROT;
  73
  74         return NT_STATUS_OK;
  75 }
  76
  77
  78 /*
  79   a tree connect request has completed
  80 */
  81 static NTSTATUS connect_tcon(struct composite_context *c,
  82                              struct smb_composite_connect *io)
  83 {
  84         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
  85         NTSTATUS status;
  86
  87         status = smb_raw_tcon_recv(state->req, c, state->io_tcon);
  88         NT_STATUS_NOT_OK_RETURN(status);
  89
  90         io->out.tree->tid = state->io_tcon->tconx.out.tid;
  91         if (state->io_tcon->tconx.out.dev_type) {
  92                 io->out.tree->device = talloc_strdup(io->out.tree,
  93                                                      state->io_tcon->tconx.out.dev_type);
  94         }
  95         if (state->io_tcon->tconx.out.fs_type) {
  96                 io->out.tree->fs_type = talloc_strdup(io->out.tree,
  97                                                       state->io_tcon->tconx.out.fs_type);
  98         }
  99
 100         /* all done! */
 101         c->state = COMPOSITE_STATE_DONE;
 102
 103         return NT_STATUS_OK;
 104 }
 105
 106
 107 /*
 108   a session setup request with anonymous fallback has completed
 109 */
 110 static NTSTATUS connect_session_setup_anon(struct composite_context *c,
 111                                            struct smb_composite_connect *io)
 112 {
 113         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 114         NTSTATUS status;
 115
 116         status = smb_composite_sesssetup_recv(state->creq);
 117         NT_STATUS_NOT_OK_RETURN(status);
 118
 119         io->out.anonymous_fallback_done = true;
 120
 121         state->session->vuid = state->io_setup->out.vuid;
 122
 123         /* setup for a tconx */
 124         io->out.tree = smbcli_tree_init(state->session, state, true);
 125         NT_STATUS_HAVE_NO_MEMORY(io->out.tree);
 126
 127         state->io_tcon = talloc(c, union smb_tcon);
 128         NT_STATUS_HAVE_NO_MEMORY(state->io_tcon);
 129
 130         /* connect to a share using a tree connect */
 131         state->io_tcon->generic.level = RAW_TCON_TCONX;
 132         state->io_tcon->tconx.in.flags = 0;
 133         state->io_tcon->tconx.in.password = data_blob(NULL, 0);
 134
 135         state->io_tcon->tconx.in.path = talloc_asprintf(state->io_tcon,
 136                                                  "\\\\%s\\%s",
 137                                                  io->in.called_name,
 138                                                  io->in.service);
 139         NT_STATUS_HAVE_NO_MEMORY(state->io_tcon->tconx.in.path);
 140         if (!io->in.service_type) {
 141                 state->io_tcon->tconx.in.device = "?????";
 142         } else {
 143                 state->io_tcon->tconx.in.device = io->in.service_type;
 144         }
 145
 146         state->req = smb_raw_tcon_send(io->out.tree, state->io_tcon);
 147         NT_STATUS_HAVE_NO_MEMORY(state->req);
 148         if (state->req->state == SMBCLI_REQUEST_ERROR) {
 149                 return state->req->status;
 150         }
 151
 152         state->req->async.fn = request_handler;
 153         state->req->async.private = c;
 154         state->stage = CONNECT_TCON;
 155
 156         return NT_STATUS_OK;
 157 }
 158
 159 /*
 160   a session setup request has completed
 161 */
 162 static NTSTATUS connect_session_setup(struct composite_context *c,
 163                                       struct smb_composite_connect *io)
 164 {
 165         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 166         NTSTATUS status;
 167
 168         status = smb_composite_sesssetup_recv(state->creq);
 169
 170         if (!NT_STATUS_IS_OK(status) &&
 171             !cli_credentials_is_anonymous(state->io->in.credentials) &&
 172             io->in.fallback_to_anonymous) {
 173
 174                 state->io_setup->in.credentials = cli_credentials_init(state);
 175                 NT_STATUS_HAVE_NO_MEMORY(state->io_setup->in.credentials);
 176                 cli_credentials_set_conf(state->io_setup->in.credentials,
 177                                          global_loadparm);
 178                 cli_credentials_set_anonymous(state->io_setup->in.credentials);
 179
 180                 /* If the preceding attempt was with extended security, we
 181                  * have been given a uid in the NTLMSSP_CHALLENGE reply. This
 182                  * would lead to an invalid uid in the anonymous fallback */
 183                 state->session->vuid = 0;
 184                 data_blob_free(&state->session->user_session_key);
 185                 talloc_free(state->session->gensec);
 186                 state->session->gensec = NULL;
 187
 188                 state->creq = smb_composite_sesssetup_send(state->session,
 189                                                            state->io_setup);
 190                 NT_STATUS_HAVE_NO_MEMORY(state->creq);
 191                 if (state->creq->state == COMPOSITE_STATE_ERROR) {
 192                         return state->creq->status;
 193                 }
 194                 state->creq->async.fn = composite_handler;
 195                 state->creq->async.private_data = c;
 196                 state->stage = CONNECT_SESSION_SETUP_ANON;
 197
 198                 return NT_STATUS_OK;
 199         }
 200
 201         NT_STATUS_NOT_OK_RETURN(status);
 202
 203         state->session->vuid = state->io_setup->out.vuid;
 204
 205         /* setup for a tconx */
 206         io->out.tree = smbcli_tree_init(state->session, state, true);
 207         NT_STATUS_HAVE_NO_MEMORY(io->out.tree);
 208
 209         state->io_tcon = talloc(c, union smb_tcon);
 210         NT_STATUS_HAVE_NO_MEMORY(state->io_tcon);
 211
 212         /* connect to a share using a tree connect */
 213         state->io_tcon->generic.level = RAW_TCON_TCONX;
 214         state->io_tcon->tconx.in.flags = 0;
 215         state->io_tcon->tconx.in.password = data_blob(NULL, 0);
 216
 217         state->io_tcon->tconx.in.path = talloc_asprintf(state->io_tcon,
 218                                                  "\\\\%s\\%s",
 219                                                  io->in.called_name,
 220                                                  io->in.service);
 221         NT_STATUS_HAVE_NO_MEMORY(state->io_tcon->tconx.in.path);
 222         if (!io->in.service_type) {
 223                 state->io_tcon->tconx.in.device = "?????";
 224         } else {
 225                 state->io_tcon->tconx.in.device = io->in.service_type;
 226         }
 227
 228         state->req = smb_raw_tcon_send(io->out.tree, state->io_tcon);
 229         NT_STATUS_HAVE_NO_MEMORY(state->req);
 230         if (state->req->state == SMBCLI_REQUEST_ERROR) {
 231                 return state->req->status;
 232         }
 233
 234         state->req->async.fn = request_handler;
 235         state->req->async.private = c;
 236         state->stage = CONNECT_TCON;
 237
 238         return NT_STATUS_OK;
 239 }
 240
 241 /*
 242   a negprot request has completed
 243 */
 244 static NTSTATUS connect_negprot(struct composite_context *c,
 245                                 struct smb_composite_connect *io)
 246 {
 247         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 248         NTSTATUS status;
 249
 250         status = smb_raw_negotiate_recv(state->req);
 251         NT_STATUS_NOT_OK_RETURN(status);
 252
 253         /* next step is a session setup */
 254         state->session = smbcli_session_init(state->transport, state, true);
 255         NT_STATUS_HAVE_NO_MEMORY(state->session);
 256
 257         state->io_setup = talloc(c, struct smb_composite_sesssetup);
 258         NT_STATUS_HAVE_NO_MEMORY(state->io_setup);
 259
 260         /* prepare a session setup to establish a security context */
 261         state->io_setup->in.sesskey      = state->transport->negotiate.sesskey;
 262         state->io_setup->in.capabilities = state->transport->negotiate.capabilities;
 263         state->io_setup->in.credentials  = io->in.credentials;
 264         state->io_setup->in.workgroup    = io->in.workgroup;
 265
 266         state->creq = smb_composite_sesssetup_send(state->session, state->io_setup);
 267         NT_STATUS_HAVE_NO_MEMORY(state->creq);
 268         if (state->creq->state == COMPOSITE_STATE_ERROR) {
 269                 return state->creq->status;
 270         }
 271
 272         state->creq->async.fn = composite_handler;
 273         state->creq->async.private_data = c;
 274         state->stage = CONNECT_SESSION_SETUP;
 275
 276         return NT_STATUS_OK;
 277 }
 278
 279
 280 /*
 281   a session request operation has completed
 282 */
 283 static NTSTATUS connect_session_request(struct composite_context *c,
 284                                         struct smb_composite_connect *io)
 285 {
 286         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 287         NTSTATUS status;
 288
 289         status = smbcli_transport_connect_recv(state->req);
 290         NT_STATUS_NOT_OK_RETURN(status);
 291
 292         /* next step is a negprot */
 293         return connect_send_negprot(c, io);
 294 }
 295
 296 /*
 297   a socket connection operation has completed
 298 */
 299 static NTSTATUS connect_socket(struct composite_context *c,
 300                                struct smb_composite_connect *io)
 301 {
 302         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 303         NTSTATUS status;
 304         struct nbt_name calling, called;
 305
 306         status = smbcli_sock_connect_recv(state->creq, state, &state->sock);
 307         NT_STATUS_NOT_OK_RETURN(status);
 308
 309         /* the socket is up - we can initialise the smbcli transport layer */
 310         state->transport = smbcli_transport_init(state->sock, state, true,
 311                                                  lp_max_xmit(global_loadparm),
 312                                                  lp_maxmux(global_loadparm));
 313         NT_STATUS_HAVE_NO_MEMORY(state->transport);
 314
 315         if (is_ipaddress(state->sock->hostname) &&
 316             (state->io->in.called_name != NULL)) {
 317                 /* If connecting to an IP address, we might want the real name
 318                  * of the host for later kerberos. The called name is a better
 319                  * approximation */
 320                 state->sock->hostname =
 321                         talloc_strdup(state->sock, io->in.called_name);
 322                 NT_STATUS_HAVE_NO_MEMORY(state->sock->hostname);
 323         }
 324
 325         make_nbt_name_client(&calling, cli_credentials_get_workstation(io->in.credentials));
 326
 327         nbt_choose_called_name(state, &called, io->in.called_name, NBT_NAME_SERVER);
 328
 329         /* we have a connected socket - next step is a session
 330            request, if needed. Port 445 doesn't need it, so it goes
 331            straight to the negprot */
 332         if (state->sock->port == 445) {
 333                 status = nbt_name_dup(state->transport, &called,
 334                                       &state->transport->called);
 335                 NT_STATUS_NOT_OK_RETURN(status);
 336                 return connect_send_negprot(c, io);
 337         }
 338
 339         state->req = smbcli_transport_connect_send(state->transport, &calling, &called);
 340         NT_STATUS_HAVE_NO_MEMORY(state->req);
 341
 342         state->req->async.fn = request_handler;
 343         state->req->async.private = c;
 344         state->stage = CONNECT_SESSION_REQUEST;
 345
 346         return NT_STATUS_OK;
 347 }
 348
 349
 350 /*
 351   called when name resolution is finished
 352 */
 353 static NTSTATUS connect_resolve(struct composite_context *c,
 354                                 struct smb_composite_connect *io)
 355 {
 356         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 357         NTSTATUS status;
 358         const char *address;
 359
 360         status = resolve_name_recv(state->creq, state, &address);
 361         NT_STATUS_NOT_OK_RETURN(status);
 362
 363         state->creq = smbcli_sock_connect_send(state, address, io->in.port,
 364                                                io->in.dest_host, c->event_ctx);
 365         NT_STATUS_HAVE_NO_MEMORY(state->creq);
 366
 367         state->stage = CONNECT_SOCKET;
 368         state->creq->async.private_data = c;
 369         state->creq->async.fn = composite_handler;
 370
 371         return NT_STATUS_OK;
 372 }
 373
 374
 375 /*
 376   handle and dispatch state transitions
 377 */
 378 static void state_handler(struct composite_context *c)
 379 {
 380         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 381
 382         switch (state->stage) {
 383         case CONNECT_RESOLVE:
 384                 c->status = connect_resolve(c, state->io);
 385                 break;
 386         case CONNECT_SOCKET:
 387                 c->status = connect_socket(c, state->io);
 388                 break;
 389         case CONNECT_SESSION_REQUEST:
 390                 c->status = connect_session_request(c, state->io);
 391                 break;
 392         case CONNECT_NEGPROT:
 393                 c->status = connect_negprot(c, state->io);
 394                 break;
 395         case CONNECT_SESSION_SETUP:
 396                 c->status = connect_session_setup(c, state->io);
 397                 break;
 398         case CONNECT_SESSION_SETUP_ANON:
 399                 c->status = connect_session_setup_anon(c, state->io);
 400                 break;
 401         case CONNECT_TCON:
 402                 c->status = connect_tcon(c, state->io);
 403                 break;
 404         }
 405
 406         if (!NT_STATUS_IS_OK(c->status)) {
 407                 c->state = COMPOSITE_STATE_ERROR;
 408         }
 409
 410         if (c->state >= COMPOSITE_STATE_DONE &&
 411             c->async.fn) {
 412                 c->async.fn(c);
 413         }
 414 }
 415
 416
 417 /*
 418   handler for completion of a smbcli_request sub-request
 419 */
 420 static void request_handler(struct smbcli_request *req)
 421 {
 422         struct composite_context *c = talloc_get_type(req->async.private,
 423                                                      struct composite_context);
 424         state_handler(c);
 425 }
 426
 427 /*
 428   handler for completion of a smbcli_composite sub-request
 429 */
 430 static void composite_handler(struct composite_context *creq)
 431 {
 432         struct composite_context *c = talloc_get_type(creq->async.private_data,
 433                                                      struct composite_context);
 434         state_handler(c);
 435 }
 436
 437 /*
 438   a function to establish a smbcli_tree from scratch
 439 */
 440 struct composite_context *smb_composite_connect_send(struct smb_composite_connect *io,
 441                                                      TALLOC_CTX *mem_ctx,
 442                                                      struct event_context *event_ctx)
 443 {
 444         struct composite_context *c;
 445         struct connect_state *state;
 446         struct nbt_name name;
 447
 448         c = talloc_zero(mem_ctx, struct composite_context);
 449         if (c == NULL) goto failed;
 450
 451         state = talloc_zero(c, struct connect_state);
 452         if (state == NULL) goto failed;
 453
 454         if (event_ctx == NULL) {
 455                 event_ctx = event_context_init(mem_ctx);
 456         }
 457
 458         state->io = io;
 459
 460         c->state = COMPOSITE_STATE_IN_PROGRESS;
 461         c->event_ctx = talloc_reference(c, event_ctx);
 462         c->private_data = state;
 463
 464         state->stage = CONNECT_RESOLVE;
 465         make_nbt_name_server(&name, io->in.dest_host);
 466         state->creq = resolve_name_send(&name, c->event_ctx,
 467                                         lp_name_resolve_order(global_loadparm));
 468
 469         if (state->creq == NULL) goto failed;
 470         state->creq->async.private_data = c;
 471         state->creq->async.fn = composite_handler;
 472
 473         return c;
 474 failed:
 475         talloc_free(c);
 476         return NULL;
 477 }
 478
 479 /*
 480   recv half of async composite connect code
 481 */
 482 NTSTATUS smb_composite_connect_recv(struct composite_context *c, TALLOC_CTX *mem_ctx)
 483 {
 484         NTSTATUS status;
 485
 486         status = composite_wait(c);
 487
 488         if (NT_STATUS_IS_OK(status)) {
 489                 struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 490                 talloc_steal(mem_ctx, state->io->out.tree);
 491         }
 492
 493         talloc_free(c);
 494         return status;
 495 }
 496
 497 /*
 498   sync version of smb_composite_connect
 499 */
 500 NTSTATUS smb_composite_connect(struct smb_composite_connect *io, TALLOC_CTX *mem_ctx,
 501                                struct event_context *ev)
 502 {
 503         struct composite_context *c = smb_composite_connect_send(io, mem_ctx, ev);
 504         return smb_composite_connect_recv(c, mem_ctx);
 505 }