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/* Copyright (C) 2017-2022 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::common::nom7::take_until_and_consume;
use nom7::bytes::streaming::take;
use nom7::combinator::{cond, rest, verify};
use nom7::error::{make_error, ErrorKind};
use nom7::number::streaming::{le_u16, le_u32, le_u8};
use nom7::Err;
use nom7::IResult;
use std::fmt;
#[derive(Debug, PartialEq, Eq)]
pub struct NTLMSSPVersion {
pub ver_major: u8,
pub ver_minor: u8,
pub ver_build: u16,
pub ver_ntlm_rev: u8,
}
impl fmt::Display for NTLMSSPVersion {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"{}.{} build {} rev {}",
self.ver_major, self.ver_minor, self.ver_build, self.ver_ntlm_rev
)
}
}
fn parse_ntlm_auth_version(i: &[u8]) -> IResult<&[u8], NTLMSSPVersion> {
let (i, ver_major) = le_u8(i)?;
let (i, ver_minor) = le_u8(i)?;
let (i, ver_build) = le_u16(i)?;
let (i, _) = take(3_usize)(i)?;
let (i, ver_ntlm_rev) = le_u8(i)?;
let version = NTLMSSPVersion {
ver_major,
ver_minor,
ver_build,
ver_ntlm_rev,
};
Ok((i, version))
}
#[derive(Debug, PartialEq, Eq)]
pub struct NTLMSSPAuthRecord<'a> {
pub domain: &'a [u8],
pub user: &'a [u8],
pub host: &'a [u8],
pub version: Option<NTLMSSPVersion>,
pub warning: bool,
}
#[derive(Debug, PartialEq, Eq)]
pub struct NTLMSSPNegotiateFlags {
pub version: bool,
// others fields not done because not interesting yet
}
fn parse_ntlm_auth_nego_flags(i: &[u8]) -> IResult<&[u8], NTLMSSPNegotiateFlags> {
let (i, raw) = le_u32(i)?;
return Ok((
i,
NTLMSSPNegotiateFlags {
version: (raw & 0x2000000) != 0,
},
));
}
const NTLMSSP_IDTYPE_LEN: usize = 12;
fn extract_ntlm_substring(i: &[u8], offset: u32, length: u16) -> IResult<&[u8], &[u8]> {
if offset < NTLMSSP_IDTYPE_LEN as u32 {
return Err(Err::Error(make_error(i, ErrorKind::LengthValue)));
}
let start = offset as usize - NTLMSSP_IDTYPE_LEN;
let end = offset as usize + length as usize - NTLMSSP_IDTYPE_LEN;
if i.len() < end {
return Err(Err::Error(make_error(i, ErrorKind::LengthValue)));
}
return Ok((i, &i[start..end]));
}
pub fn parse_ntlm_auth_record(i: &[u8]) -> IResult<&[u8], NTLMSSPAuthRecord> {
let orig_i = i;
let record_len = i.len() + NTLMSSP_IDTYPE_LEN; // identifier (8) and type (4) are cut before we are called
let (i, _lm_blob_len) = verify(le_u16, |&v| (v as usize) < record_len)(i)?;
let (i, _lm_blob_maxlen) = le_u16(i)?;
let (i, _lm_blob_offset) = verify(le_u32, |&v| (v as usize) < record_len)(i)?;
let (i, _ntlmresp_blob_len) = verify(le_u16, |&v| (v as usize) < record_len)(i)?;
let (i, _ntlmresp_blob_maxlen) = le_u16(i)?;
let (i, _ntlmresp_blob_offset) = verify(le_u32, |&v| (v as usize) < record_len)(i)?;
let (i, domain_blob_len) = verify(le_u16, |&v| (v as usize) < record_len)(i)?;
let (i, _domain_blob_maxlen) = le_u16(i)?;
let (i, domain_blob_offset) = verify(le_u32, |&v| (v as usize) < record_len)(i)?;
let (i, user_blob_len) = verify(le_u16, |&v| (v as usize) < record_len)(i)?;
let (i, _user_blob_maxlen) = le_u16(i)?;
let (i, user_blob_offset) = verify(le_u32, |&v| (v as usize) < record_len)(i)?;
let (i, host_blob_len) = verify(le_u16, |&v| (v as usize) < record_len)(i)?;
let (i, _host_blob_maxlen) = le_u16(i)?;
let (i, host_blob_offset) = verify(le_u32, |&v| (v as usize) < record_len)(i)?;
let (i, _ssnkey_blob_len) = verify(le_u16, |&v| (v as usize) < record_len)(i)?;
let (i, _ssnkey_blob_maxlen) = le_u16(i)?;
let (i, _ssnkey_blob_offset) = verify(le_u32, |&v| (v as usize) < record_len)(i)?;
let (i, nego_flags) = parse_ntlm_auth_nego_flags(i)?;
let (_, version) = cond(nego_flags.version, parse_ntlm_auth_version)(i)?;
// Caller does not care about remaining input...
let (_, domain_blob) = extract_ntlm_substring(orig_i, domain_blob_offset, domain_blob_len)?;
let (_, user_blob) = extract_ntlm_substring(orig_i, user_blob_offset, user_blob_len)?;
let (_, host_blob) = extract_ntlm_substring(orig_i, host_blob_offset, host_blob_len)?;
let mut warning = false;
if (user_blob_offset > 0 && user_blob_offset < domain_blob_offset + domain_blob_len as u32)
|| (host_blob_offset > 0 && host_blob_offset < user_blob_offset + user_blob_len as u32)
{
// to set event in transaction
warning = true;
}
let record = NTLMSSPAuthRecord {
domain: domain_blob,
user: user_blob,
host: host_blob,
warning,
version,
};
Ok((i, record))
}
#[derive(Debug, PartialEq, Eq)]
pub struct NTLMSSPRecord<'a> {
pub msg_type: u32,
pub data: &'a [u8],
}
pub fn parse_ntlmssp(i: &[u8]) -> IResult<&[u8], NTLMSSPRecord> {
let (i, _) = take_until_and_consume(b"NTLMSSP\x00")(i)?;
let (i, msg_type) = le_u32(i)?;
let (i, data) = rest(i)?;
let record = NTLMSSPRecord { msg_type, data };
Ok((i, record))
}
#[cfg(test)]
mod tests {
use super::*;
use nom7::Err;
#[test]
fn test_parse_auth_nego_flags() {
// ntlmssp.negotiateflags 1
let blob = [0x15, 0x82, 0x88, 0xe2];
let result = parse_ntlm_auth_nego_flags(&blob);
match result {
Ok((remainder, flags)) => {
assert!(flags.version);
assert_eq!(remainder.len(), 0);
}
Err(Err::Error(err)) => {
panic!("Result should not be an error: {:?}.", err.code);
}
Err(Err::Incomplete(_)) => {
panic!("Result should not have been incomplete.");
}
_ => {
panic!("Unexpected behavior!");
}
}
// ntlmssp.negotiateflags 0
let blob = [0x15, 0x82, 0x88, 0xe0];
let result = parse_ntlm_auth_nego_flags(&blob);
match result {
Ok((remainder, flags)) => {
assert!(!flags.version);
assert_eq!(remainder.len(), 0);
}
Err(Err::Error(err)) => {
panic!("Result should not be an error: {:?}.", err.code);
}
Err(Err::Incomplete(_)) => {
panic!("Result should not have been incomplete.");
}
_ => {
panic!("Unexpected behavior!");
}
}
}
}
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