source3/smbd/smb2_negprot.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smbd/globals.h"
  23 #include "../source4/libcli/smb2/smb2_constants.h"
  24
  25 extern enum protocol_types Protocol;
  26
  27 /*
  28  * this is the entry point if SMB2 is selected via
  29  * the SMB negprot
  30  */
  31 void reply_smb2002(struct smb_request *req, uint16_t choice)
  32 {
  33         uint8_t *smb2_inbuf;
  34         uint8_t *smb2_hdr;
  35         uint8_t *smb2_body;
  36         uint8_t *smb2_dyn;
  37         size_t len = 4 + SMB2_HDR_BODY + 0x24 + 2;
  38
  39         smb2_inbuf = talloc_zero_array(talloc_tos(), uint8_t, len);
  40         if (smb2_inbuf == NULL) {
  41                 DEBUG(0, ("Could not push spnego blob\n"));
  42                 reply_nterror(req, NT_STATUS_NO_MEMORY);
  43                 return;
  44         }
  45         smb2_hdr = smb2_inbuf + 4;
  46         smb2_body = smb2_hdr + SMB2_HDR_BODY;
  47         smb2_dyn = smb2_body + 0x24;
  48
  49         SIVAL(smb2_hdr, SMB2_HDR_PROTOCOL_ID,   SMB2_MAGIC);
  50         SIVAL(smb2_hdr, SMB2_HDR_LENGTH,        SMB2_HDR_BODY);
  51
  52         SSVAL(smb2_body, 0x00, 0x0024); /* struct size */
  53         SSVAL(smb2_body, 0x02, 0x0001); /* dialect count */
  54
  55         SSVAL(smb2_dyn,  0x00, 0x0202); /* dialect 2.002 */
  56
  57         req->outbuf = NULL;
  58
  59         smbd_smb2_first_negprot(smbd_server_conn, smb2_inbuf, len);
  60         return;
  61 }
  62
  63 NTSTATUS smbd_smb2_request_process_negprot(struct smbd_smb2_request *req)
  64 {
  65         const uint8_t *inbody;
  66         const uint8_t *indyn = NULL;
  67         int i = req->current_idx;
  68         DATA_BLOB outbody;
  69         DATA_BLOB outdyn;
  70         DATA_BLOB negprot_spnego_blob;
  71         uint16_t security_offset;
  72         DATA_BLOB security_buffer;
  73         size_t expected_body_size = 0x24;
  74         size_t body_size;
  75         size_t expected_dyn_size = 0;
  76         size_t c;
  77         uint16_t security_mode;
  78         uint16_t dialect_count;
  79         uint16_t dialect;
  80         uint32_t capabilities;
  81
  82 /* TODO: drop the connection with INVALI_PARAMETER */
  83
  84         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  85                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  86         }
  87
  88         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  89
  90         body_size = SVAL(inbody, 0x00);
  91         if (body_size != expected_body_size) {
  92                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  93         }
  94
  95         dialect_count = SVAL(inbody, 0x02);
  96         if (dialect_count == 0) {
  97                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  98         }
  99
 100         expected_dyn_size = dialect_count * 2;
 101         if (req->in.vector[i+2].iov_len < expected_dyn_size) {
 102                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 103         }
 104         indyn = (const uint8_t *)req->in.vector[i+2].iov_base;
 105
 106         for (c=0; c < dialect_count; c++) {
 107                 dialect = SVAL(indyn, c*2);
 108                 if (dialect == SMB2_DIALECT_REVISION_202) {
 109                         break;
 110                 }
 111         }
 112
 113         if (dialect != SMB2_DIALECT_REVISION_202) {
 114                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 115         }
 116
 117         Protocol = PROTOCOL_SMB2;
 118
 119         if (get_remote_arch() != RA_SAMBA) {
 120                 set_remote_arch(RA_VISTA);
 121         }
 122
 123         /* negprot_spnego() returns a the server guid in the first 16 bytes */
 124         negprot_spnego_blob = negprot_spnego();
 125         if (negprot_spnego_blob.data == NULL) {
 126                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 127         }
 128         talloc_steal(req, negprot_spnego_blob.data);
 129
 130         if (negprot_spnego_blob.length < 16) {
 131                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 132         }
 133
 134         security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 135         if (lp_server_signing() == Required) {
 136                 security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
 137         }
 138
 139         capabilities = 0;
 140         if (lp_host_msdfs()) {
 141                 capabilities |= SMB2_CAP_DFS;
 142         }
 143
 144         security_offset = SMB2_HDR_BODY + 0x40;
 145
 146 #if 1
 147         /* Try SPNEGO auth... */
 148         security_buffer = data_blob_const(negprot_spnego_blob.data + 16,
 149                                           negprot_spnego_blob.length - 16);
 150 #else
 151         /* for now we want raw NTLMSSP */
 152         security_buffer = data_blob_const(NULL, 0);
 153 #endif
 154
 155         outbody = data_blob_talloc(req->out.vector, NULL, 0x40);
 156         if (outbody.data == NULL) {
 157                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 158         }
 159
 160         SSVAL(outbody.data, 0x00, 0x40 + 1);    /* struct size */
 161         SSVAL(outbody.data, 0x02,
 162               security_mode);                   /* security mode */
 163         SSVAL(outbody.data, 0x04, dialect);     /* dialect revision */
 164         SSVAL(outbody.data, 0x06, 0);           /* reserved */
 165         memcpy(outbody.data + 0x08,
 166                negprot_spnego_blob.data, 16);   /* server guid */
 167         SIVAL(outbody.data, 0x18,
 168               capabilities);                    /* capabilities */
 169         SIVAL(outbody.data, 0x1C, 0x00010000);  /* max transact size */
 170         SIVAL(outbody.data, 0x20, 0x00010000);  /* max read size */
 171         SIVAL(outbody.data, 0x24, 0x00010000);  /* max write size */
 172         SBVAL(outbody.data, 0x28, 0);           /* system time */
 173         SBVAL(outbody.data, 0x30, 0);           /* server start time */
 174         SSVAL(outbody.data, 0x38,
 175               security_offset);                 /* security buffer offset */
 176         SSVAL(outbody.data, 0x3A,
 177               security_buffer.length);          /* security buffer length */
 178         SIVAL(outbody.data, 0x3C, 0);           /* reserved */
 179
 180         outdyn = security_buffer;
 181
 182         return smbd_smb2_request_done(req, outbody, &outdyn);
 183 }