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 smbcli_options options;
  37         struct smb2_negprot negprot;
  38         struct smb2_tree_connect tcon;
  39         struct smb2_session *session;
  40         struct smb2_tree *tree;
  41 };
  42
  43 /*
  44   continue after tcon reply
  45 */
  46 static void continue_tcon(struct smb2_request *req)
  47 {
  48         struct composite_context *c = talloc_get_type(req->async.private_data,
  49                                                       struct composite_context);
  50         struct smb2_connect_state *state = talloc_get_type(c->private_data,
  51                                                            struct smb2_connect_state);
  52
  53         c->status = smb2_tree_connect_recv(req, &state->tcon);
  54         if (!composite_is_ok(c)) return;
  55
  56         state->tree->tid = state->tcon.out.tid;
  57
  58         composite_done(c);
  59 }
  60
  61 /*
  62   continue after a session setup
  63 */
  64 static void continue_session(struct composite_context *creq)
  65 {
  66         struct composite_context *c = talloc_get_type(creq->async.private_data,
  67                                                       struct composite_context);
  68         struct smb2_connect_state *state = talloc_get_type(c->private_data,
  69                                                            struct smb2_connect_state);
  70         struct smb2_request *req;
  71
  72         c->status = smb2_session_setup_spnego_recv(creq);
  73         if (!composite_is_ok(c)) return;
  74
  75         state->tree = smb2_tree_init(state->session, state, true);
  76         if (composite_nomem(state->tree, c)) return;
  77
  78         state->tcon.in.reserved = 0;
  79         state->tcon.in.path     = talloc_asprintf(state, "\\\\%s\\%s",
  80                                                   state->host, state->share);
  81         if (composite_nomem(state->tcon.in.path, c)) return;
  82
  83         req = smb2_tree_connect_send(state->tree, &state->tcon);
  84         if (composite_nomem(req, c)) return;
  85
  86         req->async.fn = continue_tcon;
  87         req->async.private_data = c;
  88 }
  89
  90 /*
  91   continue after negprot reply
  92 */
  93 static void continue_negprot(struct smb2_request *req)
  94 {
  95         struct composite_context *c = talloc_get_type(req->async.private_data,
  96                                                       struct composite_context);
  97         struct smb2_connect_state *state = talloc_get_type(c->private_data,
  98                                                            struct smb2_connect_state);
  99         struct smb2_transport *transport = req->transport;
 100         struct composite_context *creq;
 101
 102         c->status = smb2_negprot_recv(req, c, &state->negprot);
 103         if (!composite_is_ok(c)) return;
 104
 105         transport->negotiate.system_time = state->negprot.out.system_time;
 106         transport->negotiate.server_start_time = state->negprot.out.server_start_time;
 107         transport->negotiate.security_mode = state->negprot.out.security_mode;
 108
 109         switch (transport->options.signing) {
 110         case SMB_SIGNING_OFF:
 111                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 112                         composite_error(c, NT_STATUS_ACCESS_DENIED);
 113                         return;
 114                 }
 115                 transport->signing_required = false;
 116                 break;
 117         case SMB_SIGNING_SUPPORTED:
 118                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 119                         transport->signing_required = true;
 120                 } else {
 121                         transport->signing_required = false;
 122                 }
 123                 break;
 124         case SMB_SIGNING_AUTO:
 125                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_ENABLED) {
 126                         transport->signing_required = true;
 127                 } else {
 128                         transport->signing_required = false;
 129                 }
 130                 break;
 131         case SMB_SIGNING_REQUIRED:
 132                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_ENABLED) {
 133                         transport->signing_required = true;
 134                 } else {
 135                         composite_error(c, NT_STATUS_ACCESS_DENIED);
 136                         return;
 137                 }
 138                 break;
 139         }
 140
 141
 142         state->session = smb2_session_init(transport, global_loadparm, state, true);
 143         if (composite_nomem(state->session, c)) return;
 144
 145         creq = smb2_session_setup_spnego_send(state->session, state->credentials);
 146
 147         composite_continue(c, creq, continue_session, c);
 148 }
 149
 150 /*
 151   continue after a socket connect completes
 152 */
 153 static void continue_socket(struct composite_context *creq)
 154 {
 155         struct composite_context *c = talloc_get_type(creq->async.private_data,
 156                                                       struct composite_context);
 157         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 158                                                            struct smb2_connect_state);
 159         struct smbcli_socket *sock;
 160         struct smb2_transport *transport;
 161         struct smb2_request *req;
 162         uint16_t dialects[2];
 163
 164         c->status = smbcli_sock_connect_recv(creq, state, &sock);
 165         if (!composite_is_ok(c)) return;
 166
 167         transport = smb2_transport_init(sock, state, &state->options);
 168         if (composite_nomem(transport, c)) return;
 169
 170         ZERO_STRUCT(state->negprot);
 171         state->negprot.in.dialect_count = 2;
 172         switch (transport->options.signing) {
 173         case SMB_SIGNING_OFF:
 174                 state->negprot.in.security_mode = 0;
 175                 break;
 176         case SMB_SIGNING_SUPPORTED:
 177         case SMB_SIGNING_AUTO:
 178                 state->negprot.in.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 179                 break;
 180         case SMB_SIGNING_REQUIRED:
 181                 state->negprot.in.security_mode =
 182                         SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED;
 183                 break;
 184         }
 185         state->negprot.in.capabilities  = 0;
 186         unix_to_nt_time(&state->negprot.in.start_time, time(NULL));
 187         dialects[0] = SMB2_DIALECT_REVISION;
 188         dialects[1] = 0;
 189         state->negprot.in.dialects = dialects;
 190
 191         req = smb2_negprot_send(transport, &state->negprot);
 192         if (composite_nomem(req, c)) return;
 193
 194         req->async.fn = continue_negprot;
 195         req->async.private_data = c;
 196 }
 197
 198
 199 /*
 200   continue after a resolve finishes
 201 */
 202 static void continue_resolve(struct composite_context *creq)
 203 {
 204         struct composite_context *c = talloc_get_type(creq->async.private_data,
 205                                                       struct composite_context);
 206         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 207                                                            struct smb2_connect_state);
 208         const char *addr;
 209         const char **ports;
 210         const char *default_ports[] = { "445", NULL };
 211
 212         ports = lp_parm_string_list(state, global_loadparm, NULL, "smb2", "ports", NULL);
 213         if (ports == NULL) {
 214                 ports = default_ports;
 215         }
 216
 217         c->status = resolve_name_recv(creq, state, &addr);
 218         if (!composite_is_ok(c)) return;
 219
 220         creq = smbcli_sock_connect_send(state, addr, ports, state->host, state->resolve_ctx, c->event_ctx);
 221
 222         composite_continue(c, creq, continue_socket, c);
 223 }
 224
 225 /*
 226   a composite function that does a full negprot/sesssetup/tcon, returning
 227   a connected smb2_tree
 228  */
 229 struct composite_context *smb2_connect_send(TALLOC_CTX *mem_ctx,
 230                                             const char *host,
 231                                             const char *share,
 232                                             struct resolve_context *resolve_ctx,
 233                                             struct cli_credentials *credentials,
 234                                             struct event_context *ev,
 235                                             struct smbcli_options *options)
 236 {
 237         struct composite_context *c;
 238         struct smb2_connect_state *state;
 239         struct nbt_name name;
 240         struct composite_context *creq;
 241
 242         c = composite_create(mem_ctx, ev);
 243         if (c == NULL) return NULL;
 244
 245         state = talloc(c, struct smb2_connect_state);
 246         if (composite_nomem(state, c)) return c;
 247         c->private_data = state;
 248
 249         state->credentials = credentials;
 250         state->options = *options;
 251         state->host = talloc_strdup(c, host);
 252         if (composite_nomem(state->host, c)) return c;
 253         state->share = talloc_strdup(c, share);
 254         if (composite_nomem(state->share, c)) return c;
 255         state->resolve_ctx = talloc_reference(state, resolve_ctx);
 256
 257         ZERO_STRUCT(name);
 258         name.name = host;
 259
 260         creq = resolve_name_send(resolve_ctx, &name, c->event_ctx);
 261         composite_continue(c, creq, continue_resolve, c);
 262         return c;
 263 }
 264
 265 /*
 266   receive a connect reply
 267 */
 268 NTSTATUS smb2_connect_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 269                            struct smb2_tree **tree)
 270 {
 271         NTSTATUS status;
 272         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 273                                                            struct smb2_connect_state);
 274         status = composite_wait(c);
 275         if (NT_STATUS_IS_OK(status)) {
 276                 *tree = talloc_steal(mem_ctx, state->tree);
 277         }
 278         talloc_free(c);
 279         return status;
 280 }
 281
 282 /*
 283   sync version of smb2_connect
 284 */
 285 NTSTATUS smb2_connect(TALLOC_CTX *mem_ctx,
 286                       const char *host, const char *share,
 287                       struct resolve_context *resolve_ctx,
 288                       struct cli_credentials *credentials,
 289                       struct smb2_tree **tree,
 290                       struct event_context *ev,
 291                       struct smbcli_options *options)
 292 {
 293         struct composite_context *c = smb2_connect_send(mem_ctx, host, share,
 294                                                         resolve_ctx,
 295                                                         credentials, ev, options);
 296         return smb2_connect_recv(c, mem_ctx, tree);
 297 }