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/*
Unix SMB/CIFS implementation.
Core SMB2 server
Copyright (C) Stefan Metzmacher 2009
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "../libcli/smb/smb_common.h"
/*
* this is the entry point if SMB2 is selected via
* the SMB negprot
*/
void reply_smb2002(struct smb_request *req, uint16_t choice)
{
uint8_t *smb2_inbuf;
uint8_t *smb2_hdr;
uint8_t *smb2_body;
uint8_t *smb2_dyn;
size_t len = 4 + SMB2_HDR_BODY + 0x24 + 2;
smb2_inbuf = talloc_zero_array(talloc_tos(), uint8_t, len);
if (smb2_inbuf == NULL) {
DEBUG(0, ("Could not push spnego blob\n"));
reply_nterror(req, NT_STATUS_NO_MEMORY);
return;
}
smb2_hdr = smb2_inbuf + 4;
smb2_body = smb2_hdr + SMB2_HDR_BODY;
smb2_dyn = smb2_body + 0x24;
SIVAL(smb2_hdr, SMB2_HDR_PROTOCOL_ID, SMB2_MAGIC);
SIVAL(smb2_hdr, SMB2_HDR_LENGTH, SMB2_HDR_BODY);
SSVAL(smb2_body, 0x00, 0x0024); /* struct size */
SSVAL(smb2_body, 0x02, 0x0001); /* dialect count */
SSVAL(smb2_dyn, 0x00, 0x0202); /* dialect 2.002 */
req->outbuf = NULL;
smbd_smb2_first_negprot(req->sconn, smb2_inbuf, len);
return;
}
NTSTATUS smbd_smb2_request_process_negprot(struct smbd_smb2_request *req)
{
const uint8_t *inbody;
const uint8_t *indyn = NULL;
int i = req->current_idx;
DATA_BLOB outbody;
DATA_BLOB outdyn;
DATA_BLOB negprot_spnego_blob;
uint16_t security_offset;
DATA_BLOB security_buffer;
size_t expected_body_size = 0x24;
size_t body_size;
size_t expected_dyn_size = 0;
size_t c;
uint16_t security_mode;
uint16_t dialect_count;
uint16_t dialect = 0;
uint32_t capabilities;
/* TODO: drop the connection with INVALID_PARAMETER */
if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
body_size = SVAL(inbody, 0x00);
if (body_size != expected_body_size) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
dialect_count = SVAL(inbody, 0x02);
if (dialect_count == 0) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
expected_dyn_size = dialect_count * 2;
if (req->in.vector[i+2].iov_len < expected_dyn_size) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
indyn = (const uint8_t *)req->in.vector[i+2].iov_base;
for (c=0; c < dialect_count; c++) {
dialect = SVAL(indyn, c*2);
if (dialect == SMB2_DIALECT_REVISION_202) {
break;
}
}
if (dialect != SMB2_DIALECT_REVISION_202) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
set_Protocol(PROTOCOL_SMB2);
if (get_remote_arch() != RA_SAMBA) {
set_remote_arch(RA_VISTA);
}
/* negprot_spnego() returns a the server guid in the first 16 bytes */
negprot_spnego_blob = negprot_spnego(req, req->sconn);
if (negprot_spnego_blob.data == NULL) {
return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
}
if (negprot_spnego_blob.length < 16) {
return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
}
security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
if (lp_server_signing() == Required) {
security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
}
capabilities = 0;
if (lp_host_msdfs()) {
capabilities |= SMB2_CAP_DFS;
}
security_offset = SMB2_HDR_BODY + 0x40;
#if 1
/* Try SPNEGO auth... */
security_buffer = data_blob_const(negprot_spnego_blob.data + 16,
negprot_spnego_blob.length - 16);
#else
/* for now we want raw NTLMSSP */
security_buffer = data_blob_const(NULL, 0);
#endif
outbody = data_blob_talloc(req->out.vector, NULL, 0x40);
if (outbody.data == NULL) {
return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
}
SSVAL(outbody.data, 0x00, 0x40 + 1); /* struct size */
SSVAL(outbody.data, 0x02,
security_mode); /* security mode */
SSVAL(outbody.data, 0x04, dialect); /* dialect revision */
SSVAL(outbody.data, 0x06, 0); /* reserved */
memcpy(outbody.data + 0x08,
negprot_spnego_blob.data, 16); /* server guid */
SIVAL(outbody.data, 0x18,
capabilities); /* capabilities */
SIVAL(outbody.data, 0x1C, lp_smb2_max_trans()); /* max transact size */
SIVAL(outbody.data, 0x20, lp_smb2_max_read()); /* max read size */
SIVAL(outbody.data, 0x24, lp_smb2_max_write()); /* max write size */
SBVAL(outbody.data, 0x28, 0); /* system time */
SBVAL(outbody.data, 0x30, 0); /* server start time */
SSVAL(outbody.data, 0x38,
security_offset); /* security buffer offset */
SSVAL(outbody.data, 0x3A,
security_buffer.length); /* security buffer length */
SIVAL(outbody.data, 0x3C, 0); /* reserved */
outdyn = security_buffer;
return smbd_smb2_request_done(req, outbody, &outdyn);
}
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