source4/libcli/smb2/connect.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    SMB2 composite connection setup
   5
   6    Copyright (C) Andrew Tridgell 2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "libcli/raw/libcliraw.h"
  24 #include "libcli/raw/raw_proto.h"
  25 #include "libcli/smb2/smb2.h"
  26 #include "libcli/smb2/smb2_calls.h"
  27 #include "libcli/composite/composite.h"
  28 #include "libcli/resolve/resolve.h"
  29 #include "param/param.h"
  30
  31 struct smb2_connect_state {
  32         struct cli_credentials *credentials;
  33         struct resolve_context *resolve_ctx;
  34         const char *host;
  35         const char *share;
  36         struct smb2_negprot negprot;
  37         struct smb2_tree_connect tcon;
  38         struct smb2_session *session;
  39         struct smb2_tree *tree;
  40 };
  41
  42 /*
  43   continue after tcon reply
  44 */
  45 static void continue_tcon(struct smb2_request *req)
  46 {
  47         struct composite_context *c = talloc_get_type(req->async.private_data,
  48                                                       struct composite_context);
  49         struct smb2_connect_state *state = talloc_get_type(c->private_data,
  50                                                            struct smb2_connect_state);
  51
  52         c->status = smb2_tree_connect_recv(req, &state->tcon);
  53         if (!composite_is_ok(c)) return;
  54
  55         state->tree->tid = state->tcon.out.tid;
  56
  57         composite_done(c);
  58 }
  59
  60 /*
  61   continue after a session setup
  62 */
  63 static void continue_session(struct composite_context *creq)
  64 {
  65         struct composite_context *c = talloc_get_type(creq->async.private_data,
  66                                                       struct composite_context);
  67         struct smb2_connect_state *state = talloc_get_type(c->private_data,
  68                                                            struct smb2_connect_state);
  69         struct smb2_request *req;
  70
  71         c->status = smb2_session_setup_spnego_recv(creq);
  72         if (!composite_is_ok(c)) return;
  73
  74         state->tree = smb2_tree_init(state->session, state, true);
  75         if (composite_nomem(state->tree, c)) return;
  76
  77         state->tcon.in.reserved = 0;
  78         state->tcon.in.path     = talloc_asprintf(state, "\\\\%s\\%s",
  79                                                   state->host, state->share);
  80         if (composite_nomem(state->tcon.in.path, c)) return;
  81
  82         req = smb2_tree_connect_send(state->tree, &state->tcon);
  83         if (composite_nomem(req, c)) return;
  84
  85         req->async.fn = continue_tcon;
  86         req->async.private_data = c;
  87 }
  88
  89 /*
  90   continue after negprot reply
  91 */
  92 static void continue_negprot(struct smb2_request *req)
  93 {
  94         struct composite_context *c = talloc_get_type(req->async.private_data,
  95                                                       struct composite_context);
  96         struct smb2_connect_state *state = talloc_get_type(c->private_data,
  97                                                            struct smb2_connect_state);
  98         struct smb2_transport *transport = req->transport;
  99         struct composite_context *creq;
 100
 101         c->status = smb2_negprot_recv(req, c, &state->negprot);
 102         if (!composite_is_ok(c)) return;
 103
 104         state->session = smb2_session_init(transport, global_loadparm, state, true);
 105         if (composite_nomem(state->session, c)) return;
 106
 107         creq = smb2_session_setup_spnego_send(state->session, state->credentials);
 108
 109         composite_continue(c, creq, continue_session, c);
 110 }
 111
 112 /*
 113   continue after a socket connect completes
 114 */
 115 static void continue_socket(struct composite_context *creq)
 116 {
 117         struct composite_context *c = talloc_get_type(creq->async.private_data,
 118                                                       struct composite_context);
 119         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 120                                                            struct smb2_connect_state);
 121         struct smbcli_socket *sock;
 122         struct smb2_transport *transport;
 123         struct smb2_request *req;
 124         uint16_t dialects[2];
 125
 126         c->status = smbcli_sock_connect_recv(creq, state, &sock);
 127         if (!composite_is_ok(c)) return;
 128
 129         transport = smb2_transport_init(sock, state);
 130         if (composite_nomem(transport, c)) return;
 131
 132         ZERO_STRUCT(state->negprot);
 133         state->negprot.in.dialect_count = 2;
 134         state->negprot.in.security_mode = 0;
 135         state->negprot.in.capabilities  = 0;
 136         unix_to_nt_time(&state->negprot.in.start_time, time(NULL));
 137         dialects[0] = 0;
 138         dialects[1] = SMB2_DIALECT_REVISION;
 139         state->negprot.in.dialects = dialects;
 140
 141         req = smb2_negprot_send(transport, &state->negprot);
 142         if (composite_nomem(req, c)) return;
 143
 144         req->async.fn = continue_negprot;
 145         req->async.private_data = c;
 146 }
 147
 148
 149 /*
 150   continue after a resolve finishes
 151 */
 152 static void continue_resolve(struct composite_context *creq)
 153 {
 154         struct composite_context *c = talloc_get_type(creq->async.private_data,
 155                                                       struct composite_context);
 156         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 157                                                            struct smb2_connect_state);
 158         const char *addr;
 159         const char *ports[2] = { "445", NULL };
 160
 161         c->status = resolve_name_recv(creq, state, &addr);
 162         if (!composite_is_ok(c)) return;
 163
 164         creq = smbcli_sock_connect_send(state, addr, ports, state->host, state->resolve_ctx, c->event_ctx);
 165
 166         composite_continue(c, creq, continue_socket, c);
 167 }
 168
 169 /*
 170   a composite function that does a full negprot/sesssetup/tcon, returning
 171   a connected smb2_tree
 172  */
 173 struct composite_context *smb2_connect_send(TALLOC_CTX *mem_ctx,
 174                                             const char *host,
 175                                             const char *share,
 176                                             struct resolve_context *resolve_ctx,
 177                                             struct cli_credentials *credentials,
 178                                             struct event_context *ev)
 179 {
 180         struct composite_context *c;
 181         struct smb2_connect_state *state;
 182         struct nbt_name name;
 183         struct composite_context *creq;
 184
 185         c = composite_create(mem_ctx, ev);
 186         if (c == NULL) return NULL;
 187
 188         state = talloc(c, struct smb2_connect_state);
 189         if (composite_nomem(state, c)) return c;
 190         c->private_data = state;
 191
 192         state->credentials = credentials;
 193         state->host = talloc_strdup(c, host);
 194         if (composite_nomem(state->host, c)) return c;
 195         state->share = talloc_strdup(c, share);
 196         if (composite_nomem(state->share, c)) return c;
 197         state->resolve_ctx = talloc_reference(state, resolve_ctx);
 198
 199         ZERO_STRUCT(name);
 200         name.name = host;
 201
 202         creq = resolve_name_send(resolve_ctx, &name, c->event_ctx);
 203         composite_continue(c, creq, continue_resolve, c);
 204         return c;
 205 }
 206
 207 /*
 208   receive a connect reply
 209 */
 210 NTSTATUS smb2_connect_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 211                            struct smb2_tree **tree)
 212 {
 213         NTSTATUS status;
 214         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 215                                                            struct smb2_connect_state);
 216         status = composite_wait(c);
 217         if (NT_STATUS_IS_OK(status)) {
 218                 *tree = talloc_steal(mem_ctx, state->tree);
 219         }
 220         talloc_free(c);
 221         return status;
 222 }
 223
 224 /*
 225   sync version of smb2_connect
 226 */
 227 NTSTATUS smb2_connect(TALLOC_CTX *mem_ctx,
 228                       const char *host, const char *share,
 229                       struct resolve_context *resolve_ctx,
 230                       struct cli_credentials *credentials,
 231                       struct smb2_tree **tree,
 232                       struct event_context *ev)
 233 {
 234         struct composite_context *c = smb2_connect_send(mem_ctx, host, share,
 235                                                         resolve_ctx,
 236                                                         credentials, ev);
 237         return smb2_connect_recv(c, mem_ctx, tree);
 238 }