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/* Copyright (C) 2018 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* 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
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
use crate::smb::smb_records::*;
use crate::smb::smb1_records::*;
use crate::smb::smb::*;
use crate::smb::events::*;
use crate::smb::auth::*;
#[derive(Debug)]
pub struct SessionSetupRequest {
pub native_os: Vec<u8>,
pub native_lm: Vec<u8>,
pub primary_domain: Vec<u8>,
}
#[derive(Debug)]
pub struct SessionSetupResponse {
pub native_os: Vec<u8>,
pub native_lm: Vec<u8>,
}
pub fn smb1_session_setup_request_host_info(r: &SmbRecord, blob: &[u8]) -> SessionSetupRequest
{
if blob.len() > 1 && r.has_unicode_support() {
let offset = r.data.len() - blob.len();
let blob = if offset % 2 == 1 { &blob[1..] } else { blob };
let (native_os, native_lm, primary_domain) = match smb_get_unicode_string(blob) {
Ok((rem, n1)) => {
match smb_get_unicode_string(rem) {
Ok((rem, n2)) => {
match smb_get_unicode_string(rem) {
Ok((_, n3)) => { (n1, n2, n3) },
_ => { (n1, n2, Vec::new()) },
}
},
_ => { (n1, Vec::new(), Vec::new()) },
}
},
_ => { (Vec::new(), Vec::new(), Vec::new()) },
};
SCLogDebug!("name1 {:?} name2 {:?} name3 {:?}", native_os,native_lm,primary_domain);
SessionSetupRequest {
native_os,
native_lm,
primary_domain,
}
} else {
let (native_os, native_lm, primary_domain) = match smb_get_ascii_string(blob) {
Ok((rem, n1)) => {
match smb_get_ascii_string(rem) {
Ok((rem, n2)) => {
match smb_get_ascii_string(rem) {
Ok((_, n3)) => { (n1, n2, n3) },
_ => { (n1, n2, Vec::new()) },
}
},
_ => { (n1, Vec::new(), Vec::new()) },
}
},
_ => { (Vec::new(), Vec::new(), Vec::new()) },
};
SCLogDebug!("session_setup_request_host_info: not unicode");
SessionSetupRequest {
native_os,
native_lm,
primary_domain,
}
}
}
pub fn smb1_session_setup_response_host_info(r: &SmbRecord, blob: &[u8]) -> SessionSetupResponse
{
if blob.len() > 1 && r.has_unicode_support() {
let offset = r.data.len() - blob.len();
let blob = if offset % 2 == 1 { &blob[1..] } else { blob };
let (native_os, native_lm) = match smb_get_unicode_string(blob) {
Ok((rem, n1)) => {
match smb_get_unicode_string(rem) {
Ok((_, n2)) => (n1, n2),
_ => { (n1, Vec::new()) },
}
},
_ => { (Vec::new(), Vec::new()) },
};
SCLogDebug!("name1 {:?} name2 {:?}", native_os,native_lm);
SessionSetupResponse {
native_os,
native_lm,
}
} else {
SCLogDebug!("session_setup_response_host_info: not unicode");
let (native_os, native_lm) = match smb_get_ascii_string(blob) {
Ok((rem, n1)) => {
match smb_get_ascii_string(rem) {
Ok((_, n2)) => (n1, n2),
_ => { (n1, Vec::new()) },
}
},
_ => { (Vec::new(), Vec::new()) },
};
SessionSetupResponse {
native_os,
native_lm,
}
}
}
pub fn smb1_session_setup_request(state: &mut SMBState, r: &SmbRecord, andx_offset: usize)
{
SCLogDebug!("SMB1_COMMAND_SESSION_SETUP_ANDX user_id {}", r.user_id);
#[allow(clippy::single_match)]
match parse_smb_setup_andx_record(&r.data[andx_offset-SMB1_HEADER_SIZE..]) {
Ok((rem, setup)) => {
let hdr = SMBCommonHdr::new(SMBHDR_TYPE_HEADER,
r.ssn_id as u64, 0, r.multiplex_id as u64);
let tx = state.new_sessionsetup_tx(hdr);
tx.vercmd.set_smb1_cmd(r.command);
if let Some(SMBTransactionTypeData::SESSIONSETUP(ref mut td)) = tx.type_data {
td.request_host = Some(smb1_session_setup_request_host_info(r, rem));
if let Some(s) = parse_secblob(setup.sec_blob) {
td.ntlmssp = s.ntlmssp;
td.krb_ticket = s.krb;
if let Some(ntlm) = &td.ntlmssp {
if ntlm.warning {
tx.set_event(SMBEvent::UnusualNtlmsspOrder);
}
}
}
}
},
_ => {
// events.push(SMBEvent::MalformedData);
},
}
}
fn smb1_session_setup_update_tx(tx: &mut SMBTransaction, r: &SmbRecord, andx_offset: usize)
{
match parse_smb_response_setup_andx_record(&r.data[andx_offset-SMB1_HEADER_SIZE..]) {
Ok((rem, _setup)) => {
if let Some(SMBTransactionTypeData::SESSIONSETUP(ref mut td)) = tx.type_data {
td.response_host = Some(smb1_session_setup_response_host_info(r, rem));
}
},
_ => {
tx.set_event(SMBEvent::MalformedData);
},
}
// update tx even if we can't parse the response
tx.hdr = SMBCommonHdr::from1(r, SMBHDR_TYPE_HEADER); // to overwrite ssn_id 0
tx.set_status(r.nt_status, r.is_dos_error);
tx.response_done = true;
}
pub fn smb1_session_setup_response(state: &mut SMBState, r: &SmbRecord, andx_offset: usize)
{
// try exact match with session id already set (e.g. NTLMSSP AUTH phase)
let found = r.ssn_id != 0 && match state.get_sessionsetup_tx(
SMBCommonHdr::new(SMBHDR_TYPE_HEADER,
r.ssn_id as u64, 0, r.multiplex_id as u64))
{
Some(tx) => {
smb1_session_setup_update_tx(tx, r, andx_offset);
SCLogDebug!("smb1_session_setup_response: tx {:?}", tx);
true
},
None => { false },
};
// otherwise try match with ssn id 0 (e.g. NTLMSSP_NEGOTIATE)
if !found {
match state.get_sessionsetup_tx(
SMBCommonHdr::new(SMBHDR_TYPE_HEADER, 0, 0, r.multiplex_id as u64))
{
Some(tx) => {
smb1_session_setup_update_tx(tx, r, andx_offset);
SCLogDebug!("smb1_session_setup_response: tx {:?}", tx);
},
None => {
SCLogDebug!("smb1_session_setup_response: tx not found for {:?}", r);
},
}
}
}
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