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/* Copyright (C) 2020 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.
*/
// Author: Frank Honza <frank.honza@dcso.de>
use crate::applayer::*;
use crate::common::to_hex;
use crate::core::Direction;
use crate::ike::ike::{IKEState, IkeEvent};
use crate::ike::parser::*;
use nom7::Err;
use std;
use std::collections::HashSet;
#[derive(Default)]
pub struct IkeV1Header {
pub exchange_type: Option<u8>,
pub encrypted_payloads: bool,
pub key_exchange: Vec<u8>,
pub nonce: Vec<u8>,
pub vendor_ids: Vec<String>,
}
#[derive(Default)]
pub struct Ikev1ParticipantData {
pub key_exchange: String,
pub nonce: String,
pub nb_transforms: u64,
pub transform: Vec<SaAttribute>,
}
impl Ikev1ParticipantData {
pub fn reset(&mut self) {
self.key_exchange.clear();
self.nonce.clear();
self.nb_transforms = 0;
self.transform.clear();
}
pub fn update(
&mut self, key_exchange: &str, nonce: &str, transforms: &[Vec<SaAttribute>],
) {
self.key_exchange = key_exchange.to_string();
self.nonce = nonce.to_string();
if self.nb_transforms == 0 && !transforms.is_empty() {
self.transform.extend(transforms[0].iter().cloned());
}
self.nb_transforms += transforms.len() as u64;
}
}
#[derive(Default)]
pub struct Ikev1Container {
pub domain_of_interpretation: Option<u32>,
pub client: Ikev1ParticipantData,
pub server: Ikev1ParticipantData,
}
pub fn handle_ikev1(
state: &mut IKEState, current: &[u8], isakmp_header: IsakmpHeader, direction: Direction,
) -> AppLayerResult {
let mut tx = state.new_tx(direction);
tx.ike_version = 1;
tx.hdr.spi_initiator = format!("{:016x}", isakmp_header.init_spi);
tx.hdr.spi_responder = format!("{:016x}", isakmp_header.resp_spi);
tx.hdr.maj_ver = isakmp_header.maj_ver;
tx.hdr.min_ver = isakmp_header.min_ver;
tx.hdr.ikev1_header.exchange_type = Some(isakmp_header.exch_type);
tx.hdr.msg_id = isakmp_header.msg_id;
tx.hdr.flags = isakmp_header.flags;
let mut cur_payload_type = isakmp_header.next_payload;
let mut payload_types: HashSet<u8> = HashSet::new();
payload_types.insert(cur_payload_type);
if isakmp_header.flags & 0x01 != 0x01 {
match parse_ikev1_payload_list(current) {
Ok((rem, payload_list)) => {
for isakmp_payload in payload_list {
if parse_payload(
cur_payload_type,
isakmp_payload.data,
isakmp_payload.data.len() as u16,
&mut state.ikev1_container.domain_of_interpretation,
&mut tx.hdr.ikev1_header.key_exchange,
&mut tx.hdr.ikev1_header.nonce,
&mut tx.hdr.ikev1_transforms,
&mut tx.hdr.ikev1_header.vendor_ids,
&mut payload_types,
).is_err() {
SCLogDebug!("Error while parsing IKEV1 payloads");
return AppLayerResult::err();
}
cur_payload_type = isakmp_payload.payload_header.next_payload;
}
if payload_types.contains(&(IsakmpPayloadType::SecurityAssociation as u8)) {
// clear transforms on a new SA in case there is happening a new key exchange
// on the same flow, elsewise properties would be added to the old/other SA
if direction == Direction::ToServer {
state.ikev1_container.client.reset();
} else {
state.ikev1_container.server.reset();
}
}
// add transaction values to state values
if direction == Direction::ToServer {
state.ikev1_container.client.update(
&to_hex(tx.hdr.ikev1_header.key_exchange.as_ref()),
&to_hex(tx.hdr.ikev1_header.nonce.as_ref()),
&tx.hdr.ikev1_transforms,
);
} else {
if state.ikev1_container.server.nb_transforms <= 1
&& state.ikev1_container.server.nb_transforms
+ tx.hdr.ikev1_transforms.len() as u64
> 1
{
SCLogDebug!("More than one chosen server proposal");
state.set_event(IkeEvent::MultipleServerProposal);
}
state.ikev1_container.server.update(
&to_hex(tx.hdr.ikev1_header.key_exchange.as_ref()),
&to_hex(tx.hdr.ikev1_header.nonce.as_ref()),
&tx.hdr.ikev1_transforms,
);
}
if !rem.is_empty() {
// more data left unread than should be
SCLogDebug!("Unread Payload Data");
state.set_event(IkeEvent::PayloadExtraData);
}
}
Err(Err::Incomplete(_)) => {
SCLogDebug!("Insufficient data while parsing IKEV1");
return AppLayerResult::err();
}
Err(_) => {
SCLogDebug!("Error while parsing payloads and adding to the state");
return AppLayerResult::err();
}
}
}
tx.payload_types.ikev1_payload_types = Some(payload_types);
tx.hdr.ikev1_header.encrypted_payloads = isakmp_header.flags & 0x01 == 0x01;
state.transactions.push(tx);
return AppLayerResult::ok();
}
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