source3/libsmb/smb2cli_session.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    smb2 lib
   4    Copyright (C) Volker Lendecke 2011
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "client.h"
  22 #include "async_smb.h"
  23 #include "smb2cli.h"
  24 #include "../libcli/smb/smbXcli_base.h"
  25 #include "libsmb/proto.h"
  26 #include "lib/util/tevent_ntstatus.h"
  27 #include "../libcli/auth/spnego.h"
  28 #include "../auth/ntlmssp/ntlmssp.h"
  29
  30 struct smb2cli_session_setup_state {
  31         struct smbXcli_session *session;
  32         uint8_t fixed[24];
  33         uint8_t dyn_pad[1];
  34         struct iovec *recv_iov;
  35         DATA_BLOB out_security_buffer;
  36         NTSTATUS status;
  37 };
  38
  39 static void smb2cli_session_setup_done(struct tevent_req *subreq);
  40
  41 struct tevent_req *smb2cli_session_setup_send(TALLOC_CTX *mem_ctx,
  42                                 struct tevent_context *ev,
  43                                 struct smbXcli_conn *conn,
  44                                 uint32_t timeout_msec,
  45                                 struct smbXcli_session *session,
  46                                 uint8_t in_flags,
  47                                 uint32_t in_capabilities,
  48                                 uint32_t in_channel,
  49                                 uint64_t in_previous_session_id,
  50                                 const DATA_BLOB *in_security_buffer)
  51 {
  52         struct tevent_req *req, *subreq;
  53         struct smb2cli_session_setup_state *state;
  54         uint8_t *buf;
  55         uint8_t *dyn;
  56         size_t dyn_len;
  57         uint8_t security_mode;
  58         uint16_t security_buffer_offset = 0;
  59         uint16_t security_buffer_length = 0;
  60
  61         req = tevent_req_create(mem_ctx, &state,
  62                                 struct smb2cli_session_setup_state);
  63         if (req == NULL) {
  64                 return NULL;
  65         }
  66
  67         if (session == NULL) {
  68                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
  69                 return tevent_req_post(req, ev);
  70         }
  71         state->session = session;
  72         security_mode = smb2cli_session_security_mode(session);
  73
  74         if (in_security_buffer) {
  75                 if (in_security_buffer->length > UINT16_MAX) {
  76                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
  77                         return tevent_req_post(req, ev);
  78                 }
  79                 security_buffer_offset = SMB2_HDR_BODY + 24;
  80                 security_buffer_length = in_security_buffer->length;
  81         }
  82
  83         buf = state->fixed;
  84
  85         SSVAL(buf,  0, 25);
  86         SCVAL(buf,  2, in_flags);
  87         SCVAL(buf,  3, security_mode);
  88         SIVAL(buf,  4, in_capabilities);
  89         SIVAL(buf,  8, in_channel);
  90         SSVAL(buf, 12, security_buffer_offset);
  91         SSVAL(buf, 14, security_buffer_length);
  92         SBVAL(buf, 16, in_previous_session_id);
  93
  94         if (security_buffer_length > 0) {
  95                 dyn = in_security_buffer->data;
  96                 dyn_len = in_security_buffer->length;
  97         } else {
  98                 dyn = state->dyn_pad;;
  99                 dyn_len = sizeof(state->dyn_pad);
 100         }
 101
 102         subreq = smb2cli_req_send(state, ev,
 103                                   conn, SMB2_OP_SESSSETUP,
 104                                   0, 0, /* flags */
 105                                   timeout_msec,
 106                                   0xFEFF,
 107                                   0, /* tid */
 108                                   session,
 109                                   state->fixed, sizeof(state->fixed),
 110                                   dyn, dyn_len);
 111         if (tevent_req_nomem(subreq, req)) {
 112                 return tevent_req_post(req, ev);
 113         }
 114         tevent_req_set_callback(subreq, smb2cli_session_setup_done, req);
 115         return req;
 116 }
 117
 118 static void smb2cli_session_setup_done(struct tevent_req *subreq)
 119 {
 120         struct tevent_req *req =
 121                 tevent_req_callback_data(subreq,
 122                 struct tevent_req);
 123         struct smb2cli_session_setup_state *state =
 124                 tevent_req_data(req,
 125                 struct smb2cli_session_setup_state);
 126         NTSTATUS status;
 127         uint64_t current_session_id;
 128         uint64_t session_id;
 129         uint16_t session_flags;
 130         uint16_t expected_offset = 0;
 131         uint16_t security_buffer_offset;
 132         uint16_t security_buffer_length;
 133         uint8_t *security_buffer_data = NULL;
 134         const uint8_t *hdr;
 135         const uint8_t *body;
 136         static const struct smb2cli_req_expected_response expected[] = {
 137         {
 138                 .status = NT_STATUS_MORE_PROCESSING_REQUIRED,
 139                 .body_size = 0x09
 140         },
 141         {
 142                 .status = NT_STATUS_OK,
 143                 .body_size = 0x09
 144         }
 145         };
 146
 147         status = smb2cli_req_recv(subreq, state, &state->recv_iov,
 148                                   expected, ARRAY_SIZE(expected));
 149         TALLOC_FREE(subreq);
 150         if (!NT_STATUS_IS_OK(status) &&
 151             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 152                 tevent_req_nterror(req, status);
 153                 return;
 154         }
 155
 156         hdr = (const uint8_t *)state->recv_iov[0].iov_base;
 157         body = (const uint8_t *)state->recv_iov[1].iov_base;
 158
 159         session_id = BVAL(hdr, SMB2_HDR_SESSION_ID);
 160         session_flags = SVAL(body, 2);
 161
 162         security_buffer_offset = SVAL(body, 4);
 163         security_buffer_length = SVAL(body, 6);
 164
 165         if (security_buffer_length > 0) {
 166                 expected_offset = SMB2_HDR_BODY + 8;
 167         }
 168         if (security_buffer_offset != 0) {
 169                 security_buffer_data = (uint8_t *)state->recv_iov[2].iov_base;
 170                 expected_offset = SMB2_HDR_BODY + 8;
 171         }
 172
 173         if (security_buffer_offset != expected_offset) {
 174                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 175                 return;
 176         }
 177         if (security_buffer_length > state->recv_iov[2].iov_len) {
 178                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 179                 return;
 180         }
 181
 182         state->out_security_buffer.data = security_buffer_data;
 183         state->out_security_buffer.length = security_buffer_length;
 184
 185         current_session_id = smb2cli_session_current_id(state->session);
 186         if (current_session_id == 0) {
 187                 /* A new session was requested */
 188                 current_session_id = session_id;
 189         }
 190
 191         if (current_session_id != session_id) {
 192                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 193                 return;
 194         }
 195
 196         smb2cli_session_set_id_and_flags(state->session,
 197                                          session_id, session_flags);
 198
 199         state->status = status;
 200         tevent_req_done(req);
 201 }
 202
 203 NTSTATUS smb2cli_session_setup_recv(struct tevent_req *req,
 204                                     TALLOC_CTX *mem_ctx,
 205                                     struct iovec **recv_iov,
 206                                     DATA_BLOB *out_security_buffer)
 207 {
 208         struct smb2cli_session_setup_state *state =
 209                 tevent_req_data(req,
 210                 struct smb2cli_session_setup_state);
 211         NTSTATUS status;
 212         struct iovec *_tmp;
 213
 214         if (tevent_req_is_nterror(req, &status)) {
 215                 tevent_req_received(req);
 216                 return status;
 217         }
 218
 219         if (recv_iov == NULL) {
 220                 recv_iov = &_tmp;
 221         }
 222
 223         *recv_iov = talloc_move(mem_ctx, &state->recv_iov);
 224
 225         *out_security_buffer = state->out_security_buffer;
 226
 227         /*
 228          * Return the status from the server:
 229          * NT_STATUS_MORE_PROCESSING_REQUIRED or
 230          * NT_STATUS_OK.
 231          */
 232         status = state->status;
 233         tevent_req_received(req);
 234         return status;
 235 }
 236
 237 struct smb2cli_logoff_state {
 238         struct cli_state *cli;
 239         uint8_t fixed[4];
 240 };
 241
 242 static void smb2cli_logoff_done(struct tevent_req *subreq);
 243
 244 struct tevent_req *smb2cli_logoff_send(TALLOC_CTX *mem_ctx,
 245                                        struct tevent_context *ev,
 246                                        struct cli_state *cli)
 247 {
 248         struct tevent_req *req, *subreq;
 249         struct smb2cli_logoff_state *state;
 250
 251         req = tevent_req_create(mem_ctx, &state,
 252                                 struct smb2cli_logoff_state);
 253         if (req == NULL) {
 254                 return NULL;
 255         }
 256         state->cli = cli;
 257         SSVAL(state->fixed, 0, 4);
 258
 259         subreq = smb2cli_req_send(state, ev,
 260                                   cli->conn, SMB2_OP_LOGOFF,
 261                                   0, 0, /* flags */
 262                                   cli->timeout,
 263                                   cli->smb2.pid,
 264                                   0, /* tid */
 265                                   cli->smb2.session,
 266                                   state->fixed, sizeof(state->fixed),
 267                                   NULL, 0);
 268         if (tevent_req_nomem(subreq, req)) {
 269                 return tevent_req_post(req, ev);
 270         }
 271         tevent_req_set_callback(subreq, smb2cli_logoff_done, req);
 272         return req;
 273 }
 274
 275 static void smb2cli_logoff_done(struct tevent_req *subreq)
 276 {
 277         struct tevent_req *req =
 278                 tevent_req_callback_data(subreq,
 279                 struct tevent_req);
 280         struct smb2cli_logoff_state *state =
 281                 tevent_req_data(req,
 282                 struct smb2cli_logoff_state);
 283         NTSTATUS status;
 284         struct iovec *iov;
 285         static const struct smb2cli_req_expected_response expected[] = {
 286         {
 287                 .status = NT_STATUS_OK,
 288                 .body_size = 0x04
 289         }
 290         };
 291
 292         status = smb2cli_req_recv(subreq, state, &iov,
 293                                   expected, ARRAY_SIZE(expected));
 294         TALLOC_FREE(subreq);
 295         TALLOC_FREE(state->cli->smb2.session);
 296         if (tevent_req_nterror(req, status)) {
 297                 return;
 298         }
 299         tevent_req_done(req);
 300 }
 301
 302 NTSTATUS smb2cli_logoff_recv(struct tevent_req *req)
 303 {
 304         return tevent_req_simple_recv_ntstatus(req);
 305 }
 306
 307 NTSTATUS smb2cli_logoff(struct cli_state *cli)
 308 {
 309         TALLOC_CTX *frame = talloc_stackframe();
 310         struct event_context *ev;
 311         struct tevent_req *req;
 312         NTSTATUS status = NT_STATUS_NO_MEMORY;
 313
 314         if (cli_has_async_calls(cli)) {
 315                 /*
 316                  * Can't use sync call while an async call is in flight
 317                  */
 318                 status = NT_STATUS_INVALID_PARAMETER;
 319                 goto fail;
 320         }
 321         ev = event_context_init(frame);
 322         if (ev == NULL) {
 323                 goto fail;
 324         }
 325         req = smb2cli_logoff_send(frame, ev, cli);
 326         if (req == NULL) {
 327                 goto fail;
 328         }
 329         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 330                 goto fail;
 331         }
 332         status = smb2cli_logoff_recv(req);
 333  fail:
 334         TALLOC_FREE(frame);
 335         return status;
 336 }