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