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 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, io->in.options.unicode, io->in.options.max_protocol);
  67         NT_STATUS_HAVE_NO_MEMORY(state->req);
  68
  69         state->req->async.fn = request_handler;
  70         state->req->async.private = c;
  71         state->stage = CONNECT_NEGPROT;
  72
  73         return NT_STATUS_OK;
  74 }
  75
  76
  77 /*
  78   a tree connect request has completed
  79 */
  80 static NTSTATUS connect_tcon(struct composite_context *c,
  81                              struct smb_composite_connect *io)
  82 {
  83         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
  84         NTSTATUS status;
  85
  86         status = smb_raw_tcon_recv(state->req, c, state->io_tcon);
  87         NT_STATUS_NOT_OK_RETURN(status);
  88
  89         io->out.tree->tid = state->io_tcon->tconx.out.tid;
  90         if (state->io_tcon->tconx.out.dev_type) {
  91                 io->out.tree->device = talloc_strdup(io->out.tree,
  92                                                      state->io_tcon->tconx.out.dev_type);
  93         }
  94         if (state->io_tcon->tconx.out.fs_type) {
  95                 io->out.tree->fs_type = talloc_strdup(io->out.tree,
  96                                                       state->io_tcon->tconx.out.fs_type);
  97         }
  98
  99         /* all done! */
 100         c->state = COMPOSITE_STATE_DONE;
 101
 102         return NT_STATUS_OK;
 103 }
 104
 105
 106 /*
 107   a session setup request with anonymous fallback has completed
 108 */
 109 static NTSTATUS connect_session_setup_anon(struct composite_context *c,
 110                                            struct smb_composite_connect *io)
 111 {
 112         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 113         NTSTATUS status;
 114
 115         status = smb_composite_sesssetup_recv(state->creq);
 116         NT_STATUS_NOT_OK_RETURN(status);
 117
 118         io->out.anonymous_fallback_done = true;
 119
 120         state->session->vuid = state->io_setup->out.vuid;
 121
 122         /* setup for a tconx */
 123         io->out.tree = smbcli_tree_init(state->session, state, true);
 124         NT_STATUS_HAVE_NO_MEMORY(io->out.tree);
 125
 126         state->io_tcon = talloc(c, union smb_tcon);
 127         NT_STATUS_HAVE_NO_MEMORY(state->io_tcon);
 128
 129         /* connect to a share using a tree connect */
 130         state->io_tcon->generic.level = RAW_TCON_TCONX;
 131         state->io_tcon->tconx.in.flags = 0;
 132         state->io_tcon->tconx.in.password = data_blob(NULL, 0);
 133
 134         state->io_tcon->tconx.in.path = talloc_asprintf(state->io_tcon,
 135                                                  "\\\\%s\\%s",
 136                                                  io->in.called_name,
 137                                                  io->in.service);
 138         NT_STATUS_HAVE_NO_MEMORY(state->io_tcon->tconx.in.path);
 139         if (!io->in.service_type) {
 140                 state->io_tcon->tconx.in.device = "?????";
 141         } else {
 142                 state->io_tcon->tconx.in.device = io->in.service_type;
 143         }
 144
 145         state->req = smb_raw_tcon_send(io->out.tree, state->io_tcon);
 146         NT_STATUS_HAVE_NO_MEMORY(state->req);
 147         if (state->req->state == SMBCLI_REQUEST_ERROR) {
 148                 return state->req->status;
 149         }
 150
 151         state->req->async.fn = request_handler;
 152         state->req->async.private = c;
 153         state->stage = CONNECT_TCON;
 154
 155         return NT_STATUS_OK;
 156 }
 157
 158 /*
 159   a session setup request has completed
 160 */
 161 static NTSTATUS connect_session_setup(struct composite_context *c,
 162                                       struct smb_composite_connect *io)
 163 {
 164         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 165         NTSTATUS status;
 166
 167         status = smb_composite_sesssetup_recv(state->creq);
 168
 169         if (!NT_STATUS_IS_OK(status) &&
 170             !cli_credentials_is_anonymous(state->io->in.credentials) &&
 171             io->in.fallback_to_anonymous) {
 172
 173                 state->io_setup->in.credentials = cli_credentials_init(state);
 174                 NT_STATUS_HAVE_NO_MEMORY(state->io_setup->in.credentials);
 175                 cli_credentials_set_workstation(state->io_setup->in.credentials,
 176                    cli_credentials_get_workstation(state->io->in.credentials),
 177                    CRED_SPECIFIED);
 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                                                  &io->in.options);
 312         NT_STATUS_HAVE_NO_MEMORY(state->transport);
 313
 314         if (is_ipaddress(state->sock->hostname) &&
 315             (state->io->in.called_name != NULL)) {
 316                 /* If connecting to an IP address, we might want the real name
 317                  * of the host for later kerberos. The called name is a better
 318                  * approximation */
 319                 state->sock->hostname =
 320                         talloc_strdup(state->sock, io->in.called_name);
 321                 NT_STATUS_HAVE_NO_MEMORY(state->sock->hostname);
 322         }
 323
 324         make_nbt_name_client(&calling, cli_credentials_get_workstation(io->in.credentials));
 325
 326         nbt_choose_called_name(state, &called, io->in.called_name, NBT_NAME_SERVER);
 327
 328         /* we have a connected socket - next step is a session
 329            request, if needed. Port 445 doesn't need it, so it goes
 330            straight to the negprot */
 331         if (state->sock->port == 445) {
 332                 status = nbt_name_dup(state->transport, &called,
 333                                       &state->transport->called);
 334                 NT_STATUS_NOT_OK_RETURN(status);
 335                 return connect_send_negprot(c, io);
 336         }
 337
 338         state->req = smbcli_transport_connect_send(state->transport, &calling, &called);
 339         NT_STATUS_HAVE_NO_MEMORY(state->req);
 340
 341         state->req->async.fn = request_handler;
 342         state->req->async.private = c;
 343         state->stage = CONNECT_SESSION_REQUEST;
 344
 345         return NT_STATUS_OK;
 346 }
 347
 348
 349 /*
 350   called when name resolution is finished
 351 */
 352 static NTSTATUS connect_resolve(struct composite_context *c,
 353                                 struct smb_composite_connect *io)
 354 {
 355         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 356         NTSTATUS status;
 357         const char *address;
 358
 359         status = resolve_name_recv(state->creq, state, &address);
 360         NT_STATUS_NOT_OK_RETURN(status);
 361
 362         state->creq = smbcli_sock_connect_send(state, address,
 363                                                io->in.dest_ports,
 364                                                io->in.dest_host,
 365                                                NULL, c->event_ctx);
 366         NT_STATUS_HAVE_NO_MEMORY(state->creq);
 367
 368         state->stage = CONNECT_SOCKET;
 369         state->creq->async.private_data = c;
 370         state->creq->async.fn = composite_handler;
 371
 372         return NT_STATUS_OK;
 373 }
 374
 375
 376 /*
 377   handle and dispatch state transitions
 378 */
 379 static void state_handler(struct composite_context *c)
 380 {
 381         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 382
 383         switch (state->stage) {
 384         case CONNECT_RESOLVE:
 385                 c->status = connect_resolve(c, state->io);
 386                 break;
 387         case CONNECT_SOCKET:
 388                 c->status = connect_socket(c, state->io);
 389                 break;
 390         case CONNECT_SESSION_REQUEST:
 391                 c->status = connect_session_request(c, state->io);
 392                 break;
 393         case CONNECT_NEGPROT:
 394                 c->status = connect_negprot(c, state->io);
 395                 break;
 396         case CONNECT_SESSION_SETUP:
 397                 c->status = connect_session_setup(c, state->io);
 398                 break;
 399         case CONNECT_SESSION_SETUP_ANON:
 400                 c->status = connect_session_setup_anon(c, state->io);
 401                 break;
 402         case CONNECT_TCON:
 403                 c->status = connect_tcon(c, state->io);
 404                 break;
 405         }
 406
 407         if (!NT_STATUS_IS_OK(c->status)) {
 408                 c->state = COMPOSITE_STATE_ERROR;
 409         }
 410
 411         if (c->state >= COMPOSITE_STATE_DONE &&
 412             c->async.fn) {
 413                 c->async.fn(c);
 414         }
 415 }
 416
 417
 418 /*
 419   handler for completion of a smbcli_request sub-request
 420 */
 421 static void request_handler(struct smbcli_request *req)
 422 {
 423         struct composite_context *c = talloc_get_type(req->async.private,
 424                                                      struct composite_context);
 425         state_handler(c);
 426 }
 427
 428 /*
 429   handler for completion of a smbcli_composite sub-request
 430 */
 431 static void composite_handler(struct composite_context *creq)
 432 {
 433         struct composite_context *c = talloc_get_type(creq->async.private_data,
 434                                                      struct composite_context);
 435         state_handler(c);
 436 }
 437
 438 /*
 439   a function to establish a smbcli_tree from scratch
 440 */
 441 struct composite_context *smb_composite_connect_send(struct smb_composite_connect *io,
 442                                                      TALLOC_CTX *mem_ctx,
 443                                                      struct resolve_context *resolve_ctx,
 444                                                      struct event_context *event_ctx)
 445 {
 446         struct composite_context *c;
 447         struct connect_state *state;
 448         struct nbt_name name;
 449
 450         c = talloc_zero(mem_ctx, struct composite_context);
 451         if (c == NULL) goto failed;
 452
 453         state = talloc_zero(c, struct connect_state);
 454         if (state == NULL) goto failed;
 455
 456         if (event_ctx == NULL) {
 457                 event_ctx = event_context_init(mem_ctx);
 458         }
 459
 460         state->io = io;
 461
 462         c->state = COMPOSITE_STATE_IN_PROGRESS;
 463         c->event_ctx = talloc_reference(c, event_ctx);
 464         c->private_data = state;
 465
 466         state->stage = CONNECT_RESOLVE;
 467         make_nbt_name_server(&name, io->in.dest_host);
 468         state->creq = resolve_name_send(resolve_ctx, &name, c->event_ctx);
 469
 470         if (state->creq == NULL) goto failed;
 471         state->creq->async.private_data = c;
 472         state->creq->async.fn = composite_handler;
 473
 474         return c;
 475 failed:
 476         talloc_free(c);
 477         return NULL;
 478 }
 479
 480 /*
 481   recv half of async composite connect code
 482 */
 483 NTSTATUS smb_composite_connect_recv(struct composite_context *c, TALLOC_CTX *mem_ctx)
 484 {
 485         NTSTATUS status;
 486
 487         status = composite_wait(c);
 488
 489         if (NT_STATUS_IS_OK(status)) {
 490                 struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 491                 talloc_steal(mem_ctx, state->io->out.tree);
 492         }
 493
 494         talloc_free(c);
 495         return status;
 496 }
 497
 498 /*
 499   sync version of smb_composite_connect
 500 */
 501 NTSTATUS smb_composite_connect(struct smb_composite_connect *io, TALLOC_CTX *mem_ctx,
 502                                struct resolve_context *resolve_ctx,
 503                                struct event_context *ev)
 504 {
 505         struct composite_context *c = smb_composite_connect_send(io, mem_ctx, resolve_ctx, ev);
 506         return smb_composite_connect_recv(c, mem_ctx);
 507 }