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         const char **ports;
  37         const char *socket_options;
  38         struct gensec_settings *gensec_settings;
  39         struct smbcli_options options;
  40         struct smb2_negprot negprot;
  41         struct smb2_tree_connect tcon;
  42         struct smb2_session *session;
  43         struct smb2_tree *tree;
  44 };
  45
  46 /*
  47   continue after tcon reply
  48 */
  49 static void continue_tcon(struct smb2_request *req)
  50 {
  51         struct composite_context *c = talloc_get_type(req->async.private_data,
  52                                                       struct composite_context);
  53         struct smb2_connect_state *state = talloc_get_type(c->private_data,
  54                                                            struct smb2_connect_state);
  55
  56         c->status = smb2_tree_connect_recv(req, &state->tcon);
  57         if (!composite_is_ok(c)) return;
  58
  59         state->tree->tid = state->tcon.out.tid;
  60
  61         composite_done(c);
  62 }
  63
  64 /*
  65   continue after a session setup
  66 */
  67 static void continue_session(struct composite_context *creq)
  68 {
  69         struct composite_context *c = talloc_get_type(creq->async.private_data,
  70                                                       struct composite_context);
  71         struct smb2_connect_state *state = talloc_get_type(c->private_data,
  72                                                            struct smb2_connect_state);
  73         struct smb2_request *req;
  74
  75         c->status = smb2_session_setup_spnego_recv(creq);
  76         if (!composite_is_ok(c)) return;
  77
  78         state->tree = smb2_tree_init(state->session, state, true);
  79         if (composite_nomem(state->tree, c)) return;
  80
  81         state->tcon.in.reserved = 0;
  82         state->tcon.in.path     = talloc_asprintf(state, "\\\\%s\\%s",
  83                                                   state->host, state->share);
  84         if (composite_nomem(state->tcon.in.path, c)) return;
  85
  86         req = smb2_tree_connect_send(state->tree, &state->tcon);
  87         if (composite_nomem(req, c)) return;
  88
  89         req->async.fn = continue_tcon;
  90         req->async.private_data = c;
  91 }
  92
  93 /*
  94   continue after negprot reply
  95 */
  96 static void continue_negprot(struct smb2_request *req)
  97 {
  98         struct composite_context *c = talloc_get_type(req->async.private_data,
  99                                                       struct composite_context);
 100         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 101                                                            struct smb2_connect_state);
 102         struct smb2_transport *transport = req->transport;
 103         struct composite_context *creq;
 104
 105         c->status = smb2_negprot_recv(req, c, &state->negprot);
 106         if (!composite_is_ok(c)) return;
 107
 108         transport->negotiate.system_time = state->negprot.out.system_time;
 109         transport->negotiate.server_start_time = state->negprot.out.server_start_time;
 110         transport->negotiate.security_mode = state->negprot.out.security_mode;
 111         transport->negotiate.dialect_revision = state->negprot.out.dialect_revision;
 112
 113         switch (transport->options.signing) {
 114         case SMB_SIGNING_OFF:
 115                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 116                         composite_error(c, NT_STATUS_ACCESS_DENIED);
 117                         return;
 118                 }
 119                 transport->signing_required = false;
 120                 break;
 121         case SMB_SIGNING_SUPPORTED:
 122                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 123                         transport->signing_required = true;
 124                 } else {
 125                         transport->signing_required = false;
 126                 }
 127                 break;
 128         case SMB_SIGNING_AUTO:
 129                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_ENABLED) {
 130                         transport->signing_required = true;
 131                 } else {
 132                         transport->signing_required = false;
 133                 }
 134                 break;
 135         case SMB_SIGNING_REQUIRED:
 136                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_ENABLED) {
 137                         transport->signing_required = true;
 138                 } else {
 139                         composite_error(c, NT_STATUS_ACCESS_DENIED);
 140                         return;
 141                 }
 142                 break;
 143         }
 144
 145         state->session = smb2_session_init(transport, state->gensec_settings, state, true);
 146         if (composite_nomem(state->session, c)) return;
 147
 148         creq = smb2_session_setup_spnego_send(state->session, state->credentials);
 149
 150         composite_continue(c, creq, continue_session, c);
 151 }
 152
 153 /*
 154   continue after a socket connect completes
 155 */
 156 static void continue_socket(struct composite_context *creq)
 157 {
 158         struct composite_context *c = talloc_get_type(creq->async.private_data,
 159                                                       struct composite_context);
 160         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 161                                                            struct smb2_connect_state);
 162         struct smbcli_socket *sock;
 163         struct smb2_transport *transport;
 164         struct smb2_request *req;
 165         uint16_t dialects[2];
 166
 167         c->status = smbcli_sock_connect_recv(creq, state, &sock);
 168         if (!composite_is_ok(c)) return;
 169
 170         transport = smb2_transport_init(sock, state, &state->options);
 171         if (composite_nomem(transport, c)) return;
 172
 173         ZERO_STRUCT(state->negprot);
 174         state->negprot.in.dialect_count = 2;
 175         switch (transport->options.signing) {
 176         case SMB_SIGNING_OFF:
 177                 state->negprot.in.security_mode = 0;
 178                 break;
 179         case SMB_SIGNING_SUPPORTED:
 180         case SMB_SIGNING_AUTO:
 181                 state->negprot.in.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 182                 break;
 183         case SMB_SIGNING_REQUIRED:
 184                 state->negprot.in.security_mode =
 185                         SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED;
 186                 break;
 187         }
 188         state->negprot.in.capabilities  = 0;
 189         unix_to_nt_time(&state->negprot.in.start_time, time(NULL));
 190         dialects[0] = SMB2_DIALECT_REVISION;
 191         dialects[1] = SMB21_DIALECT_REVISION;
 192         state->negprot.in.dialects = dialects;
 193
 194         req = smb2_negprot_send(transport, &state->negprot);
 195         if (composite_nomem(req, c)) return;
 196
 197         req->async.fn = continue_negprot;
 198         req->async.private_data = c;
 199 }
 200
 201
 202 /*
 203   continue after a resolve finishes
 204 */
 205 static void continue_resolve(struct composite_context *creq)
 206 {
 207         struct composite_context *c = talloc_get_type(creq->async.private_data,
 208                                                       struct composite_context);
 209         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 210                                                            struct smb2_connect_state);
 211         const char *addr;
 212         const char **ports;
 213         const char *default_ports[] = { "445", NULL };
 214
 215         c->status = resolve_name_recv(creq, state, &addr);
 216         if (!composite_is_ok(c)) return;
 217
 218         if (state->ports == NULL) {
 219                 ports = default_ports;
 220         } else {
 221                 ports = state->ports;
 222         }
 223
 224         creq = smbcli_sock_connect_send(state, addr, ports, state->host, state->resolve_ctx, c->event_ctx, state->socket_options);
 225
 226         composite_continue(c, creq, continue_socket, c);
 227 }
 228
 229 /*
 230   a composite function that does a full negprot/sesssetup/tcon, returning
 231   a connected smb2_tree
 232  */
 233 struct composite_context *smb2_connect_send(TALLOC_CTX *mem_ctx,
 234                                             const char *host,
 235                                                 const char **ports,
 236                                             const char *share,
 237                                             struct resolve_context *resolve_ctx,
 238                                             struct cli_credentials *credentials,
 239                                             struct tevent_context *ev,
 240                                             struct smbcli_options *options,
 241                                                 const char *socket_options,
 242                                                 struct gensec_settings *gensec_settings)
 243 {
 244         struct composite_context *c;
 245         struct smb2_connect_state *state;
 246         struct nbt_name name;
 247         struct composite_context *creq;
 248
 249         c = composite_create(mem_ctx, ev);
 250         if (c == NULL) return NULL;
 251
 252         state = talloc(c, struct smb2_connect_state);
 253         if (composite_nomem(state, c)) return c;
 254         c->private_data = state;
 255
 256         state->credentials = credentials;
 257         state->options = *options;
 258         state->host = talloc_strdup(c, host);
 259         if (composite_nomem(state->host, c)) return c;
 260         state->ports = talloc_reference(state, ports);
 261         state->share = talloc_strdup(c, share);
 262         if (composite_nomem(state->share, c)) return c;
 263         state->resolve_ctx = talloc_reference(state, resolve_ctx);
 264         state->socket_options = talloc_reference(state, socket_options);
 265         state->gensec_settings = talloc_reference(state, gensec_settings);
 266
 267         ZERO_STRUCT(name);
 268         name.name = host;
 269
 270         creq = resolve_name_send(resolve_ctx, &name, c->event_ctx);
 271         composite_continue(c, creq, continue_resolve, c);
 272         return c;
 273 }
 274
 275 /*
 276   receive a connect reply
 277 */
 278 NTSTATUS smb2_connect_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 279                            struct smb2_tree **tree)
 280 {
 281         NTSTATUS status;
 282         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 283                                                            struct smb2_connect_state);
 284         status = composite_wait(c);
 285         if (NT_STATUS_IS_OK(status)) {
 286                 *tree = talloc_steal(mem_ctx, state->tree);
 287         }
 288         talloc_free(c);
 289         return status;
 290 }
 291
 292 /*
 293   sync version of smb2_connect
 294 */
 295 NTSTATUS smb2_connect(TALLOC_CTX *mem_ctx,
 296                       const char *host, const char **ports,
 297                           const char *share,
 298                       struct resolve_context *resolve_ctx,
 299                       struct cli_credentials *credentials,
 300                       struct smb2_tree **tree,
 301                       struct tevent_context *ev,
 302                       struct smbcli_options *options,
 303                           const char *socket_options,
 304                           struct gensec_settings *gensec_settings)
 305 {
 306         struct composite_context *c = smb2_connect_send(mem_ctx, host, ports,
 307                                                                                                         share, resolve_ctx,
 308                                                                                                         credentials, ev, options,
 309                                                                                                         socket_options,
 310                                                                                                         gensec_settings);
 311         return smb2_connect_recv(c, mem_ctx, tree);
 312 }