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.secblob = state->negprot.out.secblob;
 109         talloc_steal(transport, transport->negotiate.secblob.data);
 110         transport->negotiate.system_time = state->negprot.out.system_time;
 111         transport->negotiate.server_start_time = state->negprot.out.server_start_time;
 112         transport->negotiate.security_mode = state->negprot.out.security_mode;
 113         transport->negotiate.dialect_revision = state->negprot.out.dialect_revision;
 114
 115         switch (transport->options.signing) {
 116         case SMB_SIGNING_OFF:
 117                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 118                         composite_error(c, NT_STATUS_ACCESS_DENIED);
 119                         return;
 120                 }
 121                 transport->signing_required = false;
 122                 break;
 123         case SMB_SIGNING_SUPPORTED:
 124                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 125                         transport->signing_required = true;
 126                 } else {
 127                         transport->signing_required = false;
 128                 }
 129                 break;
 130         case SMB_SIGNING_AUTO:
 131                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_ENABLED) {
 132                         transport->signing_required = true;
 133                 } else {
 134                         transport->signing_required = false;
 135                 }
 136                 break;
 137         case SMB_SIGNING_REQUIRED:
 138                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_ENABLED) {
 139                         transport->signing_required = true;
 140                 } else {
 141                         composite_error(c, NT_STATUS_ACCESS_DENIED);
 142                         return;
 143                 }
 144                 break;
 145         }
 146
 147         state->session = smb2_session_init(transport, state->gensec_settings, state, true);
 148         if (composite_nomem(state->session, c)) return;
 149
 150         creq = smb2_session_setup_spnego_send(state->session, state->credentials);
 151
 152         composite_continue(c, creq, continue_session, c);
 153 }
 154
 155 /*
 156   continue after a socket connect completes
 157 */
 158 static void continue_socket(struct composite_context *creq)
 159 {
 160         struct composite_context *c = talloc_get_type(creq->async.private_data,
 161                                                       struct composite_context);
 162         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 163                                                            struct smb2_connect_state);
 164         struct smbcli_socket *sock;
 165         struct smb2_transport *transport;
 166         struct smb2_request *req;
 167         uint16_t dialects[3] = {
 168                 SMB2_DIALECT_REVISION_000,
 169                 SMB2_DIALECT_REVISION_202,
 170                 SMB2_DIALECT_REVISION_210
 171         };
 172
 173         c->status = smbcli_sock_connect_recv(creq, state, &sock);
 174         if (!composite_is_ok(c)) return;
 175
 176         transport = smb2_transport_init(sock, state, &state->options);
 177         if (composite_nomem(transport, c)) return;
 178
 179         ZERO_STRUCT(state->negprot);
 180         state->negprot.in.dialect_count = sizeof(dialects) / sizeof(dialects[0]);
 181         switch (transport->options.signing) {
 182         case SMB_SIGNING_OFF:
 183                 state->negprot.in.security_mode = 0;
 184                 break;
 185         case SMB_SIGNING_SUPPORTED:
 186         case SMB_SIGNING_AUTO:
 187                 state->negprot.in.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 188                 break;
 189         case SMB_SIGNING_REQUIRED:
 190                 state->negprot.in.security_mode =
 191                         SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED;
 192                 break;
 193         }
 194         state->negprot.in.capabilities  = 0;
 195         unix_to_nt_time(&state->negprot.in.start_time, time(NULL));
 196         state->negprot.in.dialects = dialects;
 197
 198         req = smb2_negprot_send(transport, &state->negprot);
 199         if (composite_nomem(req, c)) return;
 200
 201         req->async.fn = continue_negprot;
 202         req->async.private_data = c;
 203 }
 204
 205
 206 /*
 207   continue after a resolve finishes
 208 */
 209 static void continue_resolve(struct composite_context *creq)
 210 {
 211         struct composite_context *c = talloc_get_type(creq->async.private_data,
 212                                                       struct composite_context);
 213         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 214                                                            struct smb2_connect_state);
 215         const char *addr;
 216         const char **ports;
 217         const char *default_ports[] = { "445", NULL };
 218
 219         c->status = resolve_name_recv(creq, state, &addr);
 220         if (!composite_is_ok(c)) return;
 221
 222         if (state->ports == NULL) {
 223                 ports = default_ports;
 224         } else {
 225                 ports = state->ports;
 226         }
 227
 228         creq = smbcli_sock_connect_send(state, addr, ports, state->host, state->resolve_ctx, c->event_ctx, state->socket_options);
 229
 230         composite_continue(c, creq, continue_socket, c);
 231 }
 232
 233 /*
 234   a composite function that does a full negprot/sesssetup/tcon, returning
 235   a connected smb2_tree
 236  */
 237 struct composite_context *smb2_connect_send(TALLOC_CTX *mem_ctx,
 238                                             const char *host,
 239                                                 const char **ports,
 240                                             const char *share,
 241                                             struct resolve_context *resolve_ctx,
 242                                             struct cli_credentials *credentials,
 243                                             struct tevent_context *ev,
 244                                             struct smbcli_options *options,
 245                                                 const char *socket_options,
 246                                                 struct gensec_settings *gensec_settings)
 247 {
 248         struct composite_context *c;
 249         struct smb2_connect_state *state;
 250         struct nbt_name name;
 251         struct composite_context *creq;
 252
 253         c = composite_create(mem_ctx, ev);
 254         if (c == NULL) return NULL;
 255
 256         state = talloc(c, struct smb2_connect_state);
 257         if (composite_nomem(state, c)) return c;
 258         c->private_data = state;
 259
 260         state->credentials = credentials;
 261         state->options = *options;
 262         state->host = talloc_strdup(c, host);
 263         if (composite_nomem(state->host, c)) return c;
 264         state->ports = talloc_reference(state, ports);
 265         state->share = talloc_strdup(c, share);
 266         if (composite_nomem(state->share, c)) return c;
 267         state->resolve_ctx = talloc_reference(state, resolve_ctx);
 268         state->socket_options = talloc_reference(state, socket_options);
 269         state->gensec_settings = talloc_reference(state, gensec_settings);
 270
 271         ZERO_STRUCT(name);
 272         name.name = host;
 273
 274         creq = resolve_name_send(resolve_ctx, state, &name, c->event_ctx);
 275         composite_continue(c, creq, continue_resolve, c);
 276         return c;
 277 }
 278
 279 /*
 280   receive a connect reply
 281 */
 282 NTSTATUS smb2_connect_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 283                            struct smb2_tree **tree)
 284 {
 285         NTSTATUS status;
 286         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 287                                                            struct smb2_connect_state);
 288         status = composite_wait(c);
 289         if (NT_STATUS_IS_OK(status)) {
 290                 *tree = talloc_steal(mem_ctx, state->tree);
 291         }
 292         talloc_free(c);
 293         return status;
 294 }
 295
 296 /*
 297   sync version of smb2_connect
 298 */
 299 NTSTATUS smb2_connect(TALLOC_CTX *mem_ctx,
 300                       const char *host, const char **ports,
 301                           const char *share,
 302                       struct resolve_context *resolve_ctx,
 303                       struct cli_credentials *credentials,
 304                       struct smb2_tree **tree,
 305                       struct tevent_context *ev,
 306                       struct smbcli_options *options,
 307                           const char *socket_options,
 308                           struct gensec_settings *gensec_settings)
 309 {
 310         struct composite_context *c = smb2_connect_send(mem_ctx, host, ports,
 311                                                                                                         share, resolve_ctx,
 312                                                                                                         credentials, ev, options,
 313                                                                                                         socket_options,
 314                                                                                                         gensec_settings);
 315         return smb2_connect_recv(c, mem_ctx, tree);
 316 }