source4/libcli/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
  28 /* the stages of this call */
  29 enum connect_stage {CONNECT_RESOLVE,
  30                     CONNECT_SOCKET,
  31                     CONNECT_SESSION_REQUEST,
  32                     CONNECT_NEGPROT,
  33                     CONNECT_SESSION_SETUP,
  34                     CONNECT_TCON};
  35
  36 struct connect_state {
  37         enum connect_stage stage;
  38         struct smbcli_socket *sock;
  39         struct smbcli_transport *transport;
  40         struct smbcli_session *session;
  41         struct smb_composite_connect *io;
  42         union smb_tcon *io_tcon;
  43         struct smb_composite_sesssetup *io_setup;
  44         struct smbcli_request *req;
  45         struct composite_context *creq;
  46 };
  47
  48
  49 static void request_handler(struct smbcli_request *);
  50 static void composite_handler(struct composite_context *);
  51
  52 /*
  53   setup a negprot send
  54 */
  55 static NTSTATUS connect_send_negprot(struct composite_context *c,
  56                                      struct smb_composite_connect *io)
  57 {
  58         struct connect_state *state = talloc_get_type(c->private, struct connect_state);
  59
  60         state->req = smb_raw_negotiate_send(state->transport, lp_maxprotocol());
  61         NT_STATUS_HAVE_NO_MEMORY(state->req);
  62
  63         state->req->async.fn = request_handler;
  64         state->req->async.private = c;
  65         state->stage = CONNECT_NEGPROT;
  66
  67         return NT_STATUS_OK;
  68 }
  69
  70
  71 /*
  72   a tree connect request has competed
  73 */
  74 static NTSTATUS connect_tcon(struct composite_context *c,
  75                              struct smb_composite_connect *io)
  76 {
  77         struct connect_state *state = talloc_get_type(c->private, struct connect_state);
  78         NTSTATUS status;
  79
  80         status = smb_tree_connect_recv(state->req, c, state->io_tcon);
  81         NT_STATUS_NOT_OK_RETURN(status);
  82
  83         io->out.tree->tid = state->io_tcon->tconx.out.tid;
  84         if (state->io_tcon->tconx.out.dev_type) {
  85                 io->out.tree->device = talloc_strdup(io->out.tree,
  86                                                      state->io_tcon->tconx.out.dev_type);
  87         }
  88         if (state->io_tcon->tconx.out.fs_type) {
  89                 io->out.tree->fs_type = talloc_strdup(io->out.tree,
  90                                                       state->io_tcon->tconx.out.fs_type);
  91         }
  92
  93         /* all done! */
  94         c->state = SMBCLI_REQUEST_DONE;
  95
  96         return NT_STATUS_OK;
  97 }
  98
  99
 100 /*
 101   a session setup request has competed
 102 */
 103 static NTSTATUS connect_session_setup(struct composite_context *c,
 104                                       struct smb_composite_connect *io)
 105 {
 106         struct connect_state *state = talloc_get_type(c->private, struct connect_state);
 107         NTSTATUS status;
 108
 109         status = smb_composite_sesssetup_recv(state->creq);
 110         NT_STATUS_NOT_OK_RETURN(status);
 111
 112         state->session->vuid = state->io_setup->out.vuid;
 113
 114         /* setup for a tconx */
 115         io->out.tree = smbcli_tree_init(state->session, state, True);
 116         NT_STATUS_HAVE_NO_MEMORY(io->out.tree);
 117
 118         state->io_tcon = talloc(c, union smb_tcon);
 119         NT_STATUS_HAVE_NO_MEMORY(state->io_tcon);
 120
 121         /* connect to a share using a tree connect */
 122         state->io_tcon->generic.level = RAW_TCON_TCONX;
 123         state->io_tcon->tconx.in.flags = 0;
 124         state->io_tcon->tconx.in.password = data_blob(NULL, 0);
 125
 126         state->io_tcon->tconx.in.path = talloc_asprintf(state->io_tcon,
 127                                                  "\\\\%s\\%s",
 128                                                  io->in.called_name,
 129                                                  io->in.service);
 130         NT_STATUS_HAVE_NO_MEMORY(state->io_tcon->tconx.in.path);
 131         if (!io->in.service_type) {
 132                 state->io_tcon->tconx.in.device = "?????";
 133         } else {
 134                 state->io_tcon->tconx.in.device = io->in.service_type;
 135         }
 136
 137         state->req = smb_tree_connect_send(io->out.tree, state->io_tcon);
 138         NT_STATUS_HAVE_NO_MEMORY(state->req);
 139
 140         state->req->async.fn = request_handler;
 141         state->req->async.private = c;
 142         state->stage = CONNECT_TCON;
 143
 144         return NT_STATUS_OK;
 145 }
 146
 147 /*
 148   a negprot request has competed
 149 */
 150 static NTSTATUS connect_negprot(struct composite_context *c,
 151                                 struct smb_composite_connect *io)
 152 {
 153         struct connect_state *state = talloc_get_type(c->private, struct connect_state);
 154         NTSTATUS status;
 155
 156         status = smb_raw_negotiate_recv(state->req);
 157         NT_STATUS_NOT_OK_RETURN(status);
 158
 159         /* next step is a session setup */
 160         state->session = smbcli_session_init(state->transport, state, True);
 161         NT_STATUS_HAVE_NO_MEMORY(state->session);
 162
 163         state->io_setup = talloc(c, struct smb_composite_sesssetup);
 164         NT_STATUS_HAVE_NO_MEMORY(state->io_setup);
 165
 166         /* prepare a session setup to establish a security context */
 167         state->io_setup->in.sesskey      = state->transport->negotiate.sesskey;
 168         state->io_setup->in.capabilities = state->transport->negotiate.capabilities;
 169         state->io_setup->in.credentials  = io->in.credentials;
 170         state->io_setup->in.workgroup    = io->in.workgroup;
 171
 172         state->creq = smb_composite_sesssetup_send(state->session, state->io_setup);
 173         NT_STATUS_HAVE_NO_MEMORY(state->creq);
 174
 175         state->creq->async.fn = composite_handler;
 176         state->creq->async.private = c;
 177         state->stage = CONNECT_SESSION_SETUP;
 178
 179         return NT_STATUS_OK;
 180 }
 181
 182
 183 /*
 184   a session request operation has competed
 185 */
 186 static NTSTATUS connect_session_request(struct composite_context *c,
 187                                         struct smb_composite_connect *io)
 188 {
 189         struct connect_state *state = talloc_get_type(c->private, struct connect_state);
 190         NTSTATUS status;
 191
 192         status = smbcli_transport_connect_recv(state->req);
 193         NT_STATUS_NOT_OK_RETURN(status);
 194
 195         /* next step is a negprot */
 196         return connect_send_negprot(c, io);
 197 }
 198
 199 /*
 200   a socket connection operation has competed
 201 */
 202 static NTSTATUS connect_socket(struct composite_context *c,
 203                                struct smb_composite_connect *io)
 204 {
 205         struct connect_state *state = talloc_get_type(c->private, struct connect_state);
 206         NTSTATUS status;
 207         struct nbt_name calling, called;
 208
 209         status = smbcli_sock_connect_recv(state->creq);
 210         NT_STATUS_NOT_OK_RETURN(status);
 211
 212         /* the socket is up - we can initialise the smbcli transport layer */
 213         state->transport = smbcli_transport_init(state->sock, state, True);
 214         NT_STATUS_HAVE_NO_MEMORY(state->transport);
 215
 216         make_nbt_name_client(&calling, cli_credentials_get_workstation(io->in.credentials));
 217
 218         nbt_choose_called_name(state, &called, io->in.called_name, NBT_NAME_SERVER);
 219
 220         /* we have a connected socket - next step is a session
 221            request, if needed. Port 445 doesn't need it, so it goes
 222            straight to the negprot */
 223         if (state->sock->port == 445) {
 224                 status = nbt_name_dup(state->transport, &called,
 225                                       &state->transport->called);
 226                 NT_STATUS_NOT_OK_RETURN(status);
 227                 return connect_send_negprot(c, io);
 228         }
 229
 230         state->req = smbcli_transport_connect_send(state->transport, &calling, &called);
 231         NT_STATUS_HAVE_NO_MEMORY(state->req);
 232
 233         state->req->async.fn = request_handler;
 234         state->req->async.private = c;
 235         state->stage = CONNECT_SESSION_REQUEST;
 236
 237         return NT_STATUS_OK;
 238 }
 239
 240
 241 /*
 242   called when name resolution is finished
 243 */
 244 static NTSTATUS connect_resolve(struct composite_context *c,
 245                                 struct smb_composite_connect *io)
 246 {
 247         struct connect_state *state = talloc_get_type(c->private, struct connect_state);
 248         NTSTATUS status;
 249         const char *address;
 250
 251         status = resolve_name_recv(state->creq, state, &address);
 252         NT_STATUS_NOT_OK_RETURN(status);
 253
 254         state->creq = smbcli_sock_connect_send(state->sock, address, state->io->in.port, io->in.dest_host);
 255         NT_STATUS_HAVE_NO_MEMORY(state->creq);
 256
 257         state->stage = CONNECT_SOCKET;
 258         state->creq->async.private = c;
 259         state->creq->async.fn = composite_handler;
 260
 261         return NT_STATUS_OK;
 262 }
 263
 264
 265 /*
 266   handle and dispatch state transitions
 267 */
 268 static void state_handler(struct composite_context *c)
 269 {
 270         struct connect_state *state = talloc_get_type(c->private, struct connect_state);
 271
 272         switch (state->stage) {
 273         case CONNECT_RESOLVE:
 274                 c->status = connect_resolve(c, state->io);
 275                 break;
 276         case CONNECT_SOCKET:
 277                 c->status = connect_socket(c, state->io);
 278                 break;
 279         case CONNECT_SESSION_REQUEST:
 280                 c->status = connect_session_request(c, state->io);
 281                 break;
 282         case CONNECT_NEGPROT:
 283                 c->status = connect_negprot(c, state->io);
 284                 break;
 285         case CONNECT_SESSION_SETUP:
 286                 c->status = connect_session_setup(c, state->io);
 287                 break;
 288         case CONNECT_TCON:
 289                 c->status = connect_tcon(c, state->io);
 290                 break;
 291         }
 292
 293         if (!NT_STATUS_IS_OK(c->status)) {
 294                 c->state = SMBCLI_REQUEST_ERROR;
 295         }
 296
 297         if (c->state >= SMBCLI_REQUEST_DONE &&
 298             c->async.fn) {
 299                 c->async.fn(c);
 300         }
 301 }
 302
 303
 304 /*
 305   handler for completion of a smbcli_request sub-request
 306 */
 307 static void request_handler(struct smbcli_request *req)
 308 {
 309         struct composite_context *c = talloc_get_type(req->async.private,
 310                                                      struct composite_context);
 311         state_handler(c);
 312 }
 313
 314 /*
 315   handler for completion of a smbcli_composite sub-request
 316 */
 317 static void composite_handler(struct composite_context *req)
 318 {
 319         struct composite_context *c = talloc_get_type(req->async.private,
 320                                                      struct composite_context);
 321         state_handler(c);
 322 }
 323
 324 /*
 325   a function to establish a smbcli_tree from scratch
 326 */
 327 struct composite_context *smb_composite_connect_send(struct smb_composite_connect *io,
 328                                                     struct event_context *event_ctx)
 329 {
 330         struct composite_context *c;
 331         struct connect_state *state;
 332         struct nbt_name name;
 333
 334         c = talloc_zero(NULL, struct composite_context);
 335         if (c == NULL) goto failed;
 336
 337         state = talloc(c, struct connect_state);
 338         if (state == NULL) goto failed;
 339
 340         state->sock = smbcli_sock_init(state, event_ctx);
 341         if (state->sock == NULL) goto failed;
 342
 343         state->io = io;
 344
 345         c->state = SMBCLI_REQUEST_SEND;
 346         c->event_ctx = talloc_reference(c, state->sock->event.ctx);
 347         c->private = state;
 348
 349         /* if the destination is an IP address, then skip the name resolution part */
 350         if (is_ipaddress(io->in.dest_host)) {
 351                 state->stage = CONNECT_SOCKET;
 352                 state->creq = smbcli_sock_connect_send(state->sock, io->in.dest_host,
 353                                                        state->io->in.port,
 354                                                        io->in.dest_host);
 355         } else {
 356                 state->stage = CONNECT_RESOLVE;
 357                 make_nbt_name_server(&name, io->in.dest_host);
 358                 state->creq = resolve_name_send(&name, c->event_ctx, lp_name_resolve_order());
 359         }
 360
 361         if (state->creq == NULL) goto failed;
 362         state->creq->async.private = c;
 363         state->creq->async.fn = composite_handler;
 364
 365         return c;
 366 failed:
 367         talloc_free(c);
 368         return NULL;
 369 }
 370
 371 /*
 372   recv half of async composite connect code
 373 */
 374 NTSTATUS smb_composite_connect_recv(struct composite_context *c, TALLOC_CTX *mem_ctx)
 375 {
 376         NTSTATUS status;
 377
 378         status = composite_wait(c);
 379
 380         if (NT_STATUS_IS_OK(status)) {
 381                 struct connect_state *state = talloc_get_type(c->private, struct connect_state);
 382                 talloc_steal(mem_ctx, state->io->out.tree);
 383         }
 384
 385         talloc_free(c);
 386         return status;
 387 }
 388
 389 /*
 390   sync version of smb_composite_connect
 391 */
 392 NTSTATUS smb_composite_connect(struct smb_composite_connect *io, TALLOC_CTX *mem_ctx,
 393                                struct event_context *ev)
 394 {
 395         struct composite_context *c = smb_composite_connect_send(io, ev);
 396         return smb_composite_connect_recv(c, mem_ctx);
 397 }