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 "../libcli/smb/smb_common.h"
  24
  25 /*
  26  * this is the entry point if SMB2 is selected via
  27  * the SMB negprot
  28  */
  29 void reply_smb2002(struct smb_request *req, uint16_t choice)
  30 {
  31         uint8_t *smb2_inbuf;
  32         uint8_t *smb2_hdr;
  33         uint8_t *smb2_body;
  34         uint8_t *smb2_dyn;
  35         size_t len = 4 + SMB2_HDR_BODY + 0x24 + 2;
  36
  37         smb2_inbuf = talloc_zero_array(talloc_tos(), uint8_t, len);
  38         if (smb2_inbuf == NULL) {
  39                 DEBUG(0, ("Could not push spnego blob\n"));
  40                 reply_nterror(req, NT_STATUS_NO_MEMORY);
  41                 return;
  42         }
  43         smb2_hdr = smb2_inbuf + 4;
  44         smb2_body = smb2_hdr + SMB2_HDR_BODY;
  45         smb2_dyn = smb2_body + 0x24;
  46
  47         SIVAL(smb2_hdr, SMB2_HDR_PROTOCOL_ID,   SMB2_MAGIC);
  48         SIVAL(smb2_hdr, SMB2_HDR_LENGTH,        SMB2_HDR_BODY);
  49
  50         SSVAL(smb2_body, 0x00, 0x0024); /* struct size */
  51         SSVAL(smb2_body, 0x02, 0x0001); /* dialect count */
  52
  53         SSVAL(smb2_dyn,  0x00, 0x0202); /* dialect 2.002 */
  54
  55         req->outbuf = NULL;
  56
  57         smbd_smb2_first_negprot(smbd_server_conn, smb2_inbuf, len);
  58         return;
  59 }
  60
  61 NTSTATUS smbd_smb2_request_process_negprot(struct smbd_smb2_request *req)
  62 {
  63         const uint8_t *inbody;
  64         const uint8_t *indyn = NULL;
  65         int i = req->current_idx;
  66         DATA_BLOB outbody;
  67         DATA_BLOB outdyn;
  68         DATA_BLOB negprot_spnego_blob;
  69         uint16_t security_offset;
  70         DATA_BLOB security_buffer;
  71         size_t expected_body_size = 0x24;
  72         size_t body_size;
  73         size_t expected_dyn_size = 0;
  74         size_t c;
  75         uint16_t security_mode;
  76         uint16_t dialect_count;
  77         uint16_t dialect = 0;
  78         uint32_t capabilities;
  79
  80 /* TODO: drop the connection with INVALI_PARAMETER */
  81
  82         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  83                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  84         }
  85
  86         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  87
  88         body_size = SVAL(inbody, 0x00);
  89         if (body_size != expected_body_size) {
  90                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  91         }
  92
  93         dialect_count = SVAL(inbody, 0x02);
  94         if (dialect_count == 0) {
  95                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  96         }
  97
  98         expected_dyn_size = dialect_count * 2;
  99         if (req->in.vector[i+2].iov_len < expected_dyn_size) {
 100                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 101         }
 102         indyn = (const uint8_t *)req->in.vector[i+2].iov_base;
 103
 104         for (c=0; c < dialect_count; c++) {
 105                 dialect = SVAL(indyn, c*2);
 106                 if (dialect == SMB2_DIALECT_REVISION_202) {
 107                         break;
 108                 }
 109         }
 110
 111         if (dialect != SMB2_DIALECT_REVISION_202) {
 112                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 113         }
 114
 115         set_Protocol(PROTOCOL_SMB2);
 116
 117         if (get_remote_arch() != RA_SAMBA) {
 118                 set_remote_arch(RA_VISTA);
 119         }
 120
 121         /* negprot_spnego() returns a the server guid in the first 16 bytes */
 122         negprot_spnego_blob = negprot_spnego();
 123         if (negprot_spnego_blob.data == NULL) {
 124                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 125         }
 126         talloc_steal(req, negprot_spnego_blob.data);
 127
 128         if (negprot_spnego_blob.length < 16) {
 129                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 130         }
 131
 132         security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 133         if (lp_server_signing() == Required) {
 134                 security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
 135         }
 136
 137         capabilities = 0;
 138         if (lp_host_msdfs()) {
 139                 capabilities |= SMB2_CAP_DFS;
 140         }
 141
 142         security_offset = SMB2_HDR_BODY + 0x40;
 143
 144 #if 1
 145         /* Try SPNEGO auth... */
 146         security_buffer = data_blob_const(negprot_spnego_blob.data + 16,
 147                                           negprot_spnego_blob.length - 16);
 148 #else
 149         /* for now we want raw NTLMSSP */
 150         security_buffer = data_blob_const(NULL, 0);
 151 #endif
 152
 153         outbody = data_blob_talloc(req->out.vector, NULL, 0x40);
 154         if (outbody.data == NULL) {
 155                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 156         }
 157
 158         SSVAL(outbody.data, 0x00, 0x40 + 1);    /* struct size */
 159         SSVAL(outbody.data, 0x02,
 160               security_mode);                   /* security mode */
 161         SSVAL(outbody.data, 0x04, dialect);     /* dialect revision */
 162         SSVAL(outbody.data, 0x06, 0);           /* reserved */
 163         memcpy(outbody.data + 0x08,
 164                negprot_spnego_blob.data, 16);   /* server guid */
 165         SIVAL(outbody.data, 0x18,
 166               capabilities);                    /* capabilities */
 167         SIVAL(outbody.data, 0x1C, lp_smb2_max_trans()); /* max transact size */
 168         SIVAL(outbody.data, 0x20, lp_smb2_max_read());  /* max read size */
 169         SIVAL(outbody.data, 0x24, lp_smb2_max_write()); /* max write size */
 170         SBVAL(outbody.data, 0x28, 0);           /* system time */
 171         SBVAL(outbody.data, 0x30, 0);           /* server start time */
 172         SSVAL(outbody.data, 0x38,
 173               security_offset);                 /* security buffer offset */
 174         SSVAL(outbody.data, 0x3A,
 175               security_buffer.length);          /* security buffer length */
 176         SIVAL(outbody.data, 0x3C, 0);           /* reserved */
 177
 178         outdyn = security_buffer;
 179
 180         return smbd_smb2_request_done(req, outbody, &outdyn);
 181 }