source3/libsmb/smb2cli_negprot.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_base.h"
  24 #include "smb2cli.h"
  25 #include "libsmb/proto.h"
  26 #include "librpc/ndr/libndr.h"
  27 #include "lib/util/tevent_ntstatus.h"
  28
  29 struct smb2cli_negprot_state {
  30         struct cli_state *cli;
  31         uint8_t fixed[36];
  32         uint8_t dyn[4];
  33 };
  34
  35 static void smb2cli_negprot_done(struct tevent_req *subreq);
  36
  37 struct tevent_req *smb2cli_negprot_send(TALLOC_CTX *mem_ctx,
  38                                         struct tevent_context *ev,
  39                                         struct cli_state *cli)
  40 {
  41         struct tevent_req *req, *subreq;
  42         struct smb2cli_negprot_state *state;
  43         uint8_t *buf;
  44
  45         req = tevent_req_create(mem_ctx, &state,
  46                                 struct smb2cli_negprot_state);
  47         if (req == NULL) {
  48                 return NULL;
  49         }
  50         state->cli = cli;
  51
  52         buf = state->fixed;
  53         SSVAL(buf, 0, 36);
  54         SSVAL(buf, 2, 2);       /* DialectCount */
  55         if (client_is_signing_mandatory(cli)) {
  56                 SSVAL(buf, 4, SMB2_NEGOTIATE_SIGNING_REQUIRED);
  57         } else {
  58                 SSVAL(buf, 4, SMB2_NEGOTIATE_SIGNING_ENABLED);
  59         }
  60         SSVAL(buf, 6, 0);       /* Reserved */
  61         SSVAL(buf, 8, 0);       /* Capabilities */
  62         memset(buf+12, 0, 16);  /* ClientGuid */
  63         SBVAL(buf, 28, 0);      /* ClientStartTime */
  64
  65         buf = state->dyn;
  66         SSVAL(buf, 0, 0x202);   /* SMB2.002 */
  67         SSVAL(buf, 2, 0x210);   /* SMB2.1 */
  68
  69         subreq = smb2cli_req_send(state, ev, cli, SMB2_OP_NEGPROT, 0,
  70                                   state->fixed, sizeof(state->fixed),
  71                                   state->dyn, sizeof(state->dyn));
  72         if (tevent_req_nomem(subreq, req)) {
  73                 return tevent_req_post(req, ev);
  74         }
  75         tevent_req_set_callback(subreq, smb2cli_negprot_done, req);
  76         return req;
  77 }
  78
  79 static void smb2cli_negprot_done(struct tevent_req *subreq)
  80 {
  81         struct tevent_req *req =
  82                 tevent_req_callback_data(subreq,
  83                 struct tevent_req);
  84         struct smb2cli_negprot_state *state =
  85                 tevent_req_data(req,
  86                 struct smb2cli_negprot_state);
  87         struct cli_state *cli = state->cli;
  88         size_t security_offset, security_length;
  89         DATA_BLOB blob;
  90         NTSTATUS status;
  91         struct iovec *iov;
  92         uint8_t *body;
  93
  94         status = smb2cli_req_recv(subreq, talloc_tos(), &iov, 65);
  95         if (!NT_STATUS_IS_OK(status)) {
  96                 TALLOC_FREE(subreq);
  97                 tevent_req_nterror(req, status);
  98                 return;
  99         }
 100         body = (uint8_t *)iov[1].iov_base;
 101
 102         cli->smb2.security_mode         = SVAL(body, 2);
 103         cli->smb2.dialect_revision      = SVAL(body, 4);
 104
 105         blob = data_blob_const(body + 8, 16);
 106         GUID_from_data_blob(&blob, &cli->smb2.server_guid);
 107
 108         cli->smb2.server_capabilities   = IVAL(body, 24);
 109         cli->smb2.max_transact_size     = IVAL(body, 28);
 110         cli->smb2.max_read_size         = IVAL(body, 32);
 111         cli->smb2.max_write_size        = IVAL(body, 36);
 112         cli->smb2.system_time           = interpret_long_date((char *)body + 40);
 113         cli->smb2.server_start_time     = interpret_long_date((char *)body + 48);
 114
 115         security_offset         = SVAL(body, 56);
 116         security_length         = SVAL(body, 58);
 117
 118         if ((security_offset != SMB2_HDR_BODY + iov[1].iov_len) ||
 119             (security_length > iov[2].iov_len)) {
 120                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 121                 return;
 122         }
 123         cli->secblob = data_blob(iov[1].iov_base, security_length);
 124
 125         tevent_req_done(req);
 126 }
 127
 128 NTSTATUS smb2cli_negprot_recv(struct tevent_req *req)
 129 {
 130         return tevent_req_simple_recv_ntstatus(req);
 131 }
 132
 133 NTSTATUS smb2cli_negprot(struct cli_state *cli)
 134 {
 135         TALLOC_CTX *frame = talloc_stackframe();
 136         struct event_context *ev;
 137         struct tevent_req *req;
 138         NTSTATUS status = NT_STATUS_NO_MEMORY;
 139
 140         if (cli_has_async_calls(cli)) {
 141                 /*
 142                  * Can't use sync call while an async call is in flight
 143                  */
 144                 status = NT_STATUS_INVALID_PARAMETER;
 145                 goto fail;
 146         }
 147         ev = event_context_init(frame);
 148         if (ev == NULL) {
 149                 goto fail;
 150         }
 151         req = smb2cli_negprot_send(frame, ev, cli);
 152         if (req == NULL) {
 153                 goto fail;
 154         }
 155         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 156                 goto fail;
 157         }
 158         status = smb2cli_negprot_recv(req);
 159  fail:
 160         TALLOC_FREE(frame);
 161         return status;
 162 }
 163