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 #include "lib/cmdline/popt_common.h"
  31
  32 struct smb2_connect_state {
  33         struct cli_credentials *credentials;
  34         struct resolve_context *resolve_ctx;
  35         const char *host;
  36         const char *share;
  37         struct smbcli_options options;
  38         struct smb2_negprot negprot;
  39         struct smb2_tree_connect tcon;
  40         struct smb2_session *session;
  41         struct smb2_tree *tree;
  42 };
  43
  44 /*
  45   continue after tcon reply
  46 */
  47 static void continue_tcon(struct smb2_request *req)
  48 {
  49         struct composite_context *c = talloc_get_type(req->async.private_data,
  50                                                       struct composite_context);
  51         struct smb2_connect_state *state = talloc_get_type(c->private_data,
  52                                                            struct smb2_connect_state);
  53
  54         c->status = smb2_tree_connect_recv(req, &state->tcon);
  55         if (!composite_is_ok(c)) return;
  56
  57         state->tree->tid = state->tcon.out.tid;
  58
  59         composite_done(c);
  60 }
  61
  62 /*
  63   continue after a session setup
  64 */
  65 static void continue_session(struct composite_context *creq)
  66 {
  67         struct composite_context *c = talloc_get_type(creq->async.private_data,
  68                                                       struct composite_context);
  69         struct smb2_connect_state *state = talloc_get_type(c->private_data,
  70                                                            struct smb2_connect_state);
  71         struct smb2_request *req;
  72
  73         c->status = smb2_session_setup_spnego_recv(creq);
  74         if (!composite_is_ok(c)) return;
  75
  76         state->tree = smb2_tree_init(state->session, state, true);
  77         if (composite_nomem(state->tree, c)) return;
  78
  79         state->tcon.in.reserved = 0;
  80         state->tcon.in.path     = talloc_asprintf(state, "\\\\%s\\%s",
  81                                                   state->host, state->share);
  82         if (composite_nomem(state->tcon.in.path, c)) return;
  83
  84         req = smb2_tree_connect_send(state->tree, &state->tcon);
  85         if (composite_nomem(req, c)) return;
  86
  87         req->async.fn = continue_tcon;
  88         req->async.private_data = c;
  89 }
  90
  91 /*
  92   continue after negprot reply
  93 */
  94 static void continue_negprot(struct smb2_request *req)
  95 {
  96         struct composite_context *c = talloc_get_type(req->async.private_data,
  97                                                       struct composite_context);
  98         struct smb2_connect_state *state = talloc_get_type(c->private_data,
  99                                                            struct smb2_connect_state);
 100         struct smb2_transport *transport = req->transport;
 101         struct composite_context *creq;
 102
 103         c->status = smb2_negprot_recv(req, c, &state->negprot);
 104         if (!composite_is_ok(c)) return;
 105
 106         transport->negotiate.system_time = state->negprot.out.system_time;
 107         transport->negotiate.server_start_time = state->negprot.out.server_start_time;
 108         transport->negotiate.security_mode = state->negprot.out.security_mode;
 109
 110         switch (transport->options.signing) {
 111         case SMB_SIGNING_OFF:
 112                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 113                         composite_error(c, NT_STATUS_ACCESS_DENIED);
 114                         return;
 115                 }
 116                 transport->signing_required = false;
 117                 break;
 118         case SMB_SIGNING_SUPPORTED:
 119                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 120                         transport->signing_required = true;
 121                 } else {
 122                         transport->signing_required = false;
 123                 }
 124                 break;
 125         case SMB_SIGNING_AUTO:
 126                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_ENABLED) {
 127                         transport->signing_required = true;
 128                 } else {
 129                         transport->signing_required = false;
 130                 }
 131                 break;
 132         case SMB_SIGNING_REQUIRED:
 133                 if (transport->negotiate.security_mode & SMB2_NEGOTIATE_SIGNING_ENABLED) {
 134                         transport->signing_required = true;
 135                 } else {
 136                         composite_error(c, NT_STATUS_ACCESS_DENIED);
 137                         return;
 138                 }
 139                 break;
 140         }
 141
 142
 143         state->session = smb2_session_init(transport, global_loadparm, state, true);
 144         if (composite_nomem(state->session, c)) return;
 145
 146         creq = smb2_session_setup_spnego_send(state->session, state->credentials);
 147
 148         composite_continue(c, creq, continue_session, c);
 149 }
 150
 151 /*
 152   continue after a socket connect completes
 153 */
 154 static void continue_socket(struct composite_context *creq)
 155 {
 156         struct composite_context *c = talloc_get_type(creq->async.private_data,
 157                                                       struct composite_context);
 158         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 159                                                            struct smb2_connect_state);
 160         struct smbcli_socket *sock;
 161         struct smb2_transport *transport;
 162         struct smb2_request *req;
 163         uint16_t dialects[2];
 164
 165         c->status = smbcli_sock_connect_recv(creq, state, &sock);
 166         if (!composite_is_ok(c)) return;
 167
 168         transport = smb2_transport_init(sock, state, &state->options);
 169         if (composite_nomem(transport, c)) return;
 170
 171         ZERO_STRUCT(state->negprot);
 172         state->negprot.in.dialect_count = 2;
 173         switch (transport->options.signing) {
 174         case SMB_SIGNING_OFF:
 175                 state->negprot.in.security_mode = 0;
 176                 break;
 177         case SMB_SIGNING_SUPPORTED:
 178         case SMB_SIGNING_AUTO:
 179                 state->negprot.in.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 180                 break;
 181         case SMB_SIGNING_REQUIRED:
 182                 state->negprot.in.security_mode =
 183                         SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED;
 184                 break;
 185         }
 186         state->negprot.in.capabilities  = 0;
 187         unix_to_nt_time(&state->negprot.in.start_time, time(NULL));
 188         dialects[0] = SMB2_DIALECT_REVISION;
 189         dialects[1] = 0;
 190         state->negprot.in.dialects = dialects;
 191
 192         req = smb2_negprot_send(transport, &state->negprot);
 193         if (composite_nomem(req, c)) return;
 194
 195         req->async.fn = continue_negprot;
 196         req->async.private_data = c;
 197 }
 198
 199
 200 /*
 201   continue after a resolve finishes
 202 */
 203 static void continue_resolve(struct composite_context *creq)
 204 {
 205         struct composite_context *c = talloc_get_type(creq->async.private_data,
 206                                                       struct composite_context);
 207         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 208                                                            struct smb2_connect_state);
 209         const char *addr;
 210         const char **ports;
 211         const char *default_ports[] = { "445", NULL };
 212
 213         ports = lp_parm_string_list(state, cmdline_lp_ctx, NULL, "smb2", "ports", NULL);
 214         if (ports == NULL) {
 215                 ports = default_ports;
 216         }
 217
 218         c->status = resolve_name_recv(creq, state, &addr);
 219         if (!composite_is_ok(c)) return;
 220
 221         creq = smbcli_sock_connect_send(state, addr, ports, state->host, state->resolve_ctx, c->event_ctx);
 222
 223         composite_continue(c, creq, continue_socket, c);
 224 }
 225
 226 /*
 227   a composite function that does a full negprot/sesssetup/tcon, returning
 228   a connected smb2_tree
 229  */
 230 struct composite_context *smb2_connect_send(TALLOC_CTX *mem_ctx,
 231                                             const char *host,
 232                                             const char *share,
 233                                             struct resolve_context *resolve_ctx,
 234                                             struct cli_credentials *credentials,
 235                                             struct event_context *ev,
 236                                             struct smbcli_options *options)
 237 {
 238         struct composite_context *c;
 239         struct smb2_connect_state *state;
 240         struct nbt_name name;
 241         struct composite_context *creq;
 242
 243         c = composite_create(mem_ctx, ev);
 244         if (c == NULL) return NULL;
 245
 246         state = talloc(c, struct smb2_connect_state);
 247         if (composite_nomem(state, c)) return c;
 248         c->private_data = state;
 249
 250         state->credentials = credentials;
 251         state->options = *options;
 252         state->host = talloc_strdup(c, host);
 253         if (composite_nomem(state->host, c)) return c;
 254         state->share = talloc_strdup(c, share);
 255         if (composite_nomem(state->share, c)) return c;
 256         state->resolve_ctx = talloc_reference(state, resolve_ctx);
 257
 258         ZERO_STRUCT(name);
 259         name.name = host;
 260
 261         creq = resolve_name_send(resolve_ctx, &name, c->event_ctx);
 262         composite_continue(c, creq, continue_resolve, c);
 263         return c;
 264 }
 265
 266 /*
 267   receive a connect reply
 268 */
 269 NTSTATUS smb2_connect_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 270                            struct smb2_tree **tree)
 271 {
 272         NTSTATUS status;
 273         struct smb2_connect_state *state = talloc_get_type(c->private_data,
 274                                                            struct smb2_connect_state);
 275         status = composite_wait(c);
 276         if (NT_STATUS_IS_OK(status)) {
 277                 *tree = talloc_steal(mem_ctx, state->tree);
 278         }
 279         talloc_free(c);
 280         return status;
 281 }
 282
 283 /*
 284   sync version of smb2_connect
 285 */
 286 NTSTATUS smb2_connect(TALLOC_CTX *mem_ctx,
 287                       const char *host, const char *share,
 288                       struct resolve_context *resolve_ctx,
 289                       struct cli_credentials *credentials,
 290                       struct smb2_tree **tree,
 291                       struct event_context *ev,
 292                       struct smbcli_options *options)
 293 {
 294         struct composite_context *c = smb2_connect_send(mem_ctx, host, share,
 295                                                         resolve_ctx,
 296                                                         credentials, ev, options);
 297         return smb2_connect_recv(c, mem_ctx, tree);
 298 }