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, lp_cli_maxprotocol());
  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_conf(state->io_setup->in.credentials);
 176                 cli_credentials_set_anonymous(state->io_setup->in.credentials);
 177
 178                 /* If the preceding attempt was with extended security, we
 179                  * have been given a uid in the NTLMSSP_CHALLENGE reply. This
 180                  * would lead to an invalid uid in the anonymous fallback */
 181                 state->session->vuid = 0;
 182                 data_blob_free(&state->session->user_session_key);
 183                 talloc_free(state->session->gensec);
 184                 state->session->gensec = NULL;
 185
 186                 state->creq = smb_composite_sesssetup_send(state->session,
 187                                                            state->io_setup);
 188                 NT_STATUS_HAVE_NO_MEMORY(state->creq);
 189                 if (state->creq->state == COMPOSITE_STATE_ERROR) {
 190                         return state->creq->status;
 191                 }
 192                 state->creq->async.fn = composite_handler;
 193                 state->creq->async.private_data = c;
 194                 state->stage = CONNECT_SESSION_SETUP_ANON;
 195
 196                 return NT_STATUS_OK;
 197         }
 198
 199         NT_STATUS_NOT_OK_RETURN(status);
 200
 201         state->session->vuid = state->io_setup->out.vuid;
 202
 203         /* setup for a tconx */
 204         io->out.tree = smbcli_tree_init(state->session, state, True);
 205         NT_STATUS_HAVE_NO_MEMORY(io->out.tree);
 206
 207         state->io_tcon = talloc(c, union smb_tcon);
 208         NT_STATUS_HAVE_NO_MEMORY(state->io_tcon);
 209
 210         /* connect to a share using a tree connect */
 211         state->io_tcon->generic.level = RAW_TCON_TCONX;
 212         state->io_tcon->tconx.in.flags = 0;
 213         state->io_tcon->tconx.in.password = data_blob(NULL, 0);
 214
 215         state->io_tcon->tconx.in.path = talloc_asprintf(state->io_tcon,
 216                                                  "\\\\%s\\%s",
 217                                                  io->in.called_name,
 218                                                  io->in.service);
 219         NT_STATUS_HAVE_NO_MEMORY(state->io_tcon->tconx.in.path);
 220         if (!io->in.service_type) {
 221                 state->io_tcon->tconx.in.device = "?????";
 222         } else {
 223                 state->io_tcon->tconx.in.device = io->in.service_type;
 224         }
 225
 226         state->req = smb_raw_tcon_send(io->out.tree, state->io_tcon);
 227         NT_STATUS_HAVE_NO_MEMORY(state->req);
 228         if (state->req->state == SMBCLI_REQUEST_ERROR) {
 229                 return state->req->status;
 230         }
 231
 232         state->req->async.fn = request_handler;
 233         state->req->async.private = c;
 234         state->stage = CONNECT_TCON;
 235
 236         return NT_STATUS_OK;
 237 }
 238
 239 /*
 240   a negprot request has completed
 241 */
 242 static NTSTATUS connect_negprot(struct composite_context *c,
 243                                 struct smb_composite_connect *io)
 244 {
 245         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 246         NTSTATUS status;
 247
 248         status = smb_raw_negotiate_recv(state->req);
 249         NT_STATUS_NOT_OK_RETURN(status);
 250
 251         /* next step is a session setup */
 252         state->session = smbcli_session_init(state->transport, state, True);
 253         NT_STATUS_HAVE_NO_MEMORY(state->session);
 254
 255         state->io_setup = talloc(c, struct smb_composite_sesssetup);
 256         NT_STATUS_HAVE_NO_MEMORY(state->io_setup);
 257
 258         /* prepare a session setup to establish a security context */
 259         state->io_setup->in.sesskey      = state->transport->negotiate.sesskey;
 260         state->io_setup->in.capabilities = state->transport->negotiate.capabilities;
 261         state->io_setup->in.credentials  = io->in.credentials;
 262         state->io_setup->in.workgroup    = io->in.workgroup;
 263
 264         state->creq = smb_composite_sesssetup_send(state->session, state->io_setup);
 265         NT_STATUS_HAVE_NO_MEMORY(state->creq);
 266         if (state->creq->state == COMPOSITE_STATE_ERROR) {
 267                 return state->creq->status;
 268         }
 269
 270         state->creq->async.fn = composite_handler;
 271         state->creq->async.private_data = c;
 272         state->stage = CONNECT_SESSION_SETUP;
 273
 274         return NT_STATUS_OK;
 275 }
 276
 277
 278 /*
 279   a session request operation has completed
 280 */
 281 static NTSTATUS connect_session_request(struct composite_context *c,
 282                                         struct smb_composite_connect *io)
 283 {
 284         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 285         NTSTATUS status;
 286
 287         status = smbcli_transport_connect_recv(state->req);
 288         NT_STATUS_NOT_OK_RETURN(status);
 289
 290         /* next step is a negprot */
 291         return connect_send_negprot(c, io);
 292 }
 293
 294 /*
 295   a socket connection operation has completed
 296 */
 297 static NTSTATUS connect_socket(struct composite_context *c,
 298                                struct smb_composite_connect *io)
 299 {
 300         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 301         NTSTATUS status;
 302         struct nbt_name calling, called;
 303
 304         status = smbcli_sock_connect_recv(state->creq, state, &state->sock);
 305         NT_STATUS_NOT_OK_RETURN(status);
 306
 307         /* the socket is up - we can initialise the smbcli transport layer */
 308         state->transport = smbcli_transport_init(state->sock, state, True);
 309         NT_STATUS_HAVE_NO_MEMORY(state->transport);
 310
 311         if (is_ipaddress(state->sock->hostname) &&
 312             (state->io->in.called_name != NULL)) {
 313                 /* If connecting to an IP address, we might want the real name
 314                  * of the host for later kerberos. The called name is a better
 315                  * approximation */
 316                 state->sock->hostname =
 317                         talloc_strdup(state->sock, io->in.called_name);
 318                 NT_STATUS_HAVE_NO_MEMORY(state->sock->hostname);
 319         }
 320
 321         make_nbt_name_client(&calling, cli_credentials_get_workstation(io->in.credentials));
 322
 323         nbt_choose_called_name(state, &called, io->in.called_name, NBT_NAME_SERVER);
 324
 325         /* we have a connected socket - next step is a session
 326            request, if needed. Port 445 doesn't need it, so it goes
 327            straight to the negprot */
 328         if (state->sock->port == 445) {
 329                 status = nbt_name_dup(state->transport, &called,
 330                                       &state->transport->called);
 331                 NT_STATUS_NOT_OK_RETURN(status);
 332                 return connect_send_negprot(c, io);
 333         }
 334
 335         state->req = smbcli_transport_connect_send(state->transport, &calling, &called);
 336         NT_STATUS_HAVE_NO_MEMORY(state->req);
 337
 338         state->req->async.fn = request_handler;
 339         state->req->async.private = c;
 340         state->stage = CONNECT_SESSION_REQUEST;
 341
 342         return NT_STATUS_OK;
 343 }
 344
 345
 346 /*
 347   called when name resolution is finished
 348 */
 349 static NTSTATUS connect_resolve(struct composite_context *c,
 350                                 struct smb_composite_connect *io)
 351 {
 352         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 353         NTSTATUS status;
 354         const char *address;
 355
 356         status = resolve_name_recv(state->creq, state, &address);
 357         NT_STATUS_NOT_OK_RETURN(status);
 358
 359         state->creq = smbcli_sock_connect_send(state, address, io->in.port,
 360                                                io->in.dest_host, c->event_ctx);
 361         NT_STATUS_HAVE_NO_MEMORY(state->creq);
 362
 363         state->stage = CONNECT_SOCKET;
 364         state->creq->async.private_data = c;
 365         state->creq->async.fn = composite_handler;
 366
 367         return NT_STATUS_OK;
 368 }
 369
 370
 371 /*
 372   handle and dispatch state transitions
 373 */
 374 static void state_handler(struct composite_context *c)
 375 {
 376         struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 377
 378         switch (state->stage) {
 379         case CONNECT_RESOLVE:
 380                 c->status = connect_resolve(c, state->io);
 381                 break;
 382         case CONNECT_SOCKET:
 383                 c->status = connect_socket(c, state->io);
 384                 break;
 385         case CONNECT_SESSION_REQUEST:
 386                 c->status = connect_session_request(c, state->io);
 387                 break;
 388         case CONNECT_NEGPROT:
 389                 c->status = connect_negprot(c, state->io);
 390                 break;
 391         case CONNECT_SESSION_SETUP:
 392                 c->status = connect_session_setup(c, state->io);
 393                 break;
 394         case CONNECT_SESSION_SETUP_ANON:
 395                 c->status = connect_session_setup_anon(c, state->io);
 396                 break;
 397         case CONNECT_TCON:
 398                 c->status = connect_tcon(c, state->io);
 399                 break;
 400         }
 401
 402         if (!NT_STATUS_IS_OK(c->status)) {
 403                 c->state = COMPOSITE_STATE_ERROR;
 404         }
 405
 406         if (c->state >= COMPOSITE_STATE_DONE &&
 407             c->async.fn) {
 408                 c->async.fn(c);
 409         }
 410 }
 411
 412
 413 /*
 414   handler for completion of a smbcli_request sub-request
 415 */
 416 static void request_handler(struct smbcli_request *req)
 417 {
 418         struct composite_context *c = talloc_get_type(req->async.private,
 419                                                      struct composite_context);
 420         state_handler(c);
 421 }
 422
 423 /*
 424   handler for completion of a smbcli_composite sub-request
 425 */
 426 static void composite_handler(struct composite_context *creq)
 427 {
 428         struct composite_context *c = talloc_get_type(creq->async.private_data,
 429                                                      struct composite_context);
 430         state_handler(c);
 431 }
 432
 433 /*
 434   a function to establish a smbcli_tree from scratch
 435 */
 436 struct composite_context *smb_composite_connect_send(struct smb_composite_connect *io,
 437                                                      TALLOC_CTX *mem_ctx,
 438                                                      struct event_context *event_ctx)
 439 {
 440         struct composite_context *c;
 441         struct connect_state *state;
 442         struct nbt_name name;
 443
 444         c = talloc_zero(mem_ctx, struct composite_context);
 445         if (c == NULL) goto failed;
 446
 447         state = talloc_zero(c, struct connect_state);
 448         if (state == NULL) goto failed;
 449
 450         if (event_ctx == NULL) {
 451                 event_ctx = event_context_init(mem_ctx);
 452         }
 453
 454         state->io = io;
 455
 456         c->state = COMPOSITE_STATE_IN_PROGRESS;
 457         c->event_ctx = talloc_reference(c, event_ctx);
 458         c->private_data = state;
 459
 460         state->stage = CONNECT_RESOLVE;
 461         make_nbt_name_server(&name, io->in.dest_host);
 462         state->creq = resolve_name_send(&name, c->event_ctx, lp_name_resolve_order());
 463
 464         if (state->creq == NULL) goto failed;
 465         state->creq->async.private_data = c;
 466         state->creq->async.fn = composite_handler;
 467
 468         return c;
 469 failed:
 470         talloc_free(c);
 471         return NULL;
 472 }
 473
 474 /*
 475   recv half of async composite connect code
 476 */
 477 NTSTATUS smb_composite_connect_recv(struct composite_context *c, TALLOC_CTX *mem_ctx)
 478 {
 479         NTSTATUS status;
 480
 481         status = composite_wait(c);
 482
 483         if (NT_STATUS_IS_OK(status)) {
 484                 struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
 485                 talloc_steal(mem_ctx, state->io->out.tree);
 486         }
 487
 488         talloc_free(c);
 489         return status;
 490 }
 491
 492 /*
 493   sync version of smb_composite_connect
 494 */
 495 NTSTATUS smb_composite_connect(struct smb_composite_connect *io, TALLOC_CTX *mem_ctx,
 496                                struct event_context *ev)
 497 {
 498         struct composite_context *c = smb_composite_connect_send(io, mem_ctx, ev);
 499         return smb_composite_connect_recv(c, mem_ctx);
 500 }