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639 lines
23 KiB
Rust
639 lines
23 KiB
Rust
/* Copyright (C) 2017-2021 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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// written by Pierre Chifflier <chifflier@wzdftpd.net>
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use std;
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use std::ffi::CString;
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use nom7::{Err, IResult};
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use nom7::number::streaming::be_u32;
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use der_parser::der::der_read_element_header;
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use der_parser::ber::Class;
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use kerberos_parser::krb5_parser;
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use kerberos_parser::krb5::{EncryptionType,ErrorCode,MessageType,PrincipalName,Realm};
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use crate::applayer::{self, *};
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use crate::core;
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use crate::core::{AppProto,Flow,ALPROTO_FAILED,ALPROTO_UNKNOWN,Direction};
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#[derive(AppLayerEvent)]
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pub enum KRB5Event {
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MalformedData,
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WeakEncryption,
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}
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pub struct KRB5State {
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state_data: AppLayerStateData,
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pub req_id: u8,
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pub record_ts: usize,
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pub defrag_buf_ts: Vec<u8>,
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pub record_tc: usize,
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pub defrag_buf_tc: Vec<u8>,
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/// List of transactions for this session
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transactions: Vec<KRB5Transaction>,
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/// tx counter for assigning incrementing id's to tx's
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tx_id: u64,
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}
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impl State<KRB5Transaction> for KRB5State {
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fn get_transaction_count(&self) -> usize {
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self.transactions.len()
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}
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fn get_transaction_by_index(&self, index: usize) -> Option<&KRB5Transaction> {
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self.transactions.get(index)
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}
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}
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pub struct KRB5Transaction {
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/// The message type: AS-REQ, AS-REP, etc.
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pub msg_type: MessageType,
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/// The client PrincipalName, if present
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pub cname: Option<PrincipalName>,
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/// The server Realm, if present
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pub realm: Option<Realm>,
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/// The server PrincipalName, if present
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pub sname: Option<PrincipalName>,
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/// Encryption used (only in AS-REP and TGS-REP)
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pub etype: Option<EncryptionType>,
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/// Encryption used for ticket
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pub ticket_etype: Option<EncryptionType>,
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/// Error code, if request has failed
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pub error_code: Option<ErrorCode>,
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/// Message type of request. For using in responses.
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pub req_type: Option<MessageType>,
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/// The internal transaction id
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id: u64,
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tx_data: applayer::AppLayerTxData,
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}
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impl Transaction for KRB5Transaction {
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fn id(&self) -> u64 {
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self.id
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}
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}
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impl Default for KRB5State {
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fn default() -> Self {
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Self::new()
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}
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}
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impl KRB5State {
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pub fn new() -> KRB5State {
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Self {
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state_data: AppLayerStateData::new(),
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req_id: 0,
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record_ts: 0,
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defrag_buf_ts: Vec::new(),
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record_tc: 0,
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defrag_buf_tc: Vec::new(),
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transactions: Vec::new(),
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tx_id: 0,
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}
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}
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/// Parse a Kerberos request message
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///
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/// Returns 0 in case of success, or -1 on error
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fn parse(&mut self, i: &[u8], direction: Direction) -> i32 {
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match der_read_element_header(i) {
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Ok((_rem,hdr)) => {
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// Kerberos messages start with an APPLICATION header
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if hdr.class() != Class::Application { return 0; }
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match hdr.tag().0 {
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10 => {
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let req = krb5_parser::parse_as_req(i);
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if let Ok((_,kdc_req)) = req {
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let mut tx = self.new_tx(direction);
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tx.msg_type = MessageType::KRB_AS_REQ;
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tx.cname = kdc_req.req_body.cname;
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tx.realm = Some(kdc_req.req_body.realm);
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tx.sname = kdc_req.req_body.sname;
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tx.etype = None;
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self.transactions.push(tx);
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};
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self.req_id = 10;
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},
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11 => {
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let res = krb5_parser::parse_as_rep(i);
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if let Ok((_,kdc_rep)) = res {
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let mut tx = self.new_tx(direction);
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tx.msg_type = MessageType::KRB_AS_REP;
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if self.req_id > 0 {
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// set request type only if previous message
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// was a request
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tx.req_type = Some(MessageType(self.req_id.into()));
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}
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tx.cname = Some(kdc_rep.cname);
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tx.realm = Some(kdc_rep.crealm);
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tx.sname = Some(kdc_rep.ticket.sname);
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tx.ticket_etype = Some(kdc_rep.ticket.enc_part.etype);
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tx.etype = Some(kdc_rep.enc_part.etype);
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self.transactions.push(tx);
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if test_weak_encryption(kdc_rep.enc_part.etype) {
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self.set_event(KRB5Event::WeakEncryption);
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}
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};
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self.req_id = 0;
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},
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12 => {
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let req = krb5_parser::parse_tgs_req(i);
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if let Ok((_,kdc_req)) = req {
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let mut tx = self.new_tx(direction);
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tx.msg_type = MessageType::KRB_TGS_REQ;
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tx.cname = kdc_req.req_body.cname;
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tx.realm = Some(kdc_req.req_body.realm);
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tx.sname = kdc_req.req_body.sname;
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tx.etype = None;
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self.transactions.push(tx);
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};
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self.req_id = 12;
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},
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13 => {
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let res = krb5_parser::parse_tgs_rep(i);
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if let Ok((_,kdc_rep)) = res {
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let mut tx = self.new_tx(direction);
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tx.msg_type = MessageType::KRB_TGS_REP;
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if self.req_id > 0 {
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// set request type only if previous message
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// was a request
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tx.req_type = Some(MessageType(self.req_id.into()));
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}
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tx.cname = Some(kdc_rep.cname);
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tx.realm = Some(kdc_rep.crealm);
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tx.ticket_etype = Some(kdc_rep.ticket.enc_part.etype);
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tx.sname = Some(kdc_rep.ticket.sname);
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tx.etype = Some(kdc_rep.enc_part.etype);
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self.transactions.push(tx);
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if test_weak_encryption(kdc_rep.enc_part.etype) {
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self.set_event(KRB5Event::WeakEncryption);
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}
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};
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self.req_id = 0;
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},
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14 => {
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self.req_id = 14;
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},
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15 => {
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self.req_id = 0;
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},
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30 => {
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let res = krb5_parser::parse_krb_error(i);
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if let Ok((_,error)) = res {
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let mut tx = self.new_tx(direction);
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if self.req_id > 0 {
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// set request type only if previous message
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// was a request
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tx.req_type = Some(MessageType(self.req_id.into()));
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}
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tx.msg_type = MessageType::KRB_ERROR;
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tx.cname = error.cname;
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tx.realm = error.crealm;
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tx.sname = Some(error.sname);
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tx.error_code = Some(error.error_code);
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self.transactions.push(tx);
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};
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self.req_id = 0;
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},
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_ => { SCLogDebug!("unknown/unsupported tag {}", hdr.tag()); },
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}
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0
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},
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Err(Err::Incomplete(_)) => {
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SCLogDebug!("Insufficient data while parsing KRB5 data");
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self.set_event(KRB5Event::MalformedData);
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-1
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},
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Err(_) => {
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SCLogDebug!("Error while parsing KRB5 data");
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self.set_event(KRB5Event::MalformedData);
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-1
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},
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}
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}
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pub fn free(&mut self) {
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// All transactions are freed when the `transactions` object is freed.
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// But let's be explicit
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self.transactions.clear();
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}
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fn new_tx(&mut self, direction: Direction) -> KRB5Transaction {
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self.tx_id += 1;
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KRB5Transaction::new(direction, self.tx_id)
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}
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fn get_tx_by_id(&mut self, tx_id: u64) -> Option<&KRB5Transaction> {
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self.transactions.iter().find(|&tx| tx.id == tx_id + 1)
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}
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fn free_tx(&mut self, tx_id: u64) {
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let tx = self.transactions.iter().position(|tx| tx.id == tx_id + 1);
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debug_assert!(tx.is_some());
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if let Some(idx) = tx {
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let _ = self.transactions.remove(idx);
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}
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}
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/// Set an event. The event is set on the most recent transaction.
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fn set_event(&mut self, event: KRB5Event) {
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if let Some(tx) = self.transactions.last_mut() {
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tx.tx_data.set_event(event as u8);
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}
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}
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}
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impl KRB5Transaction {
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pub fn new(direction: Direction, id: u64) -> KRB5Transaction {
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let krbtx = KRB5Transaction{
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msg_type: MessageType(0),
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cname: None,
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realm: None,
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sname: None,
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etype: None,
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ticket_etype: None,
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error_code: None,
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req_type: None,
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id,
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tx_data: applayer::AppLayerTxData::for_direction(direction),
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};
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return krbtx;
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}
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}
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/// Return true if Kerberos `EncryptionType` is weak
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pub fn test_weak_encryption(alg:EncryptionType) -> bool {
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match alg {
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EncryptionType::AES128_CTS_HMAC_SHA1_96 |
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EncryptionType::AES256_CTS_HMAC_SHA1_96 |
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EncryptionType::AES128_CTS_HMAC_SHA256_128 |
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EncryptionType::AES256_CTS_HMAC_SHA384_192 |
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EncryptionType::CAMELLIA128_CTS_CMAC |
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EncryptionType::CAMELLIA256_CTS_CMAC => false,
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_ => true, // all other ciphers are weak or deprecated
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}
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}
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/// Returns *mut KRB5State
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#[no_mangle]
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pub extern "C" fn rs_krb5_state_new(_orig_state: *mut std::os::raw::c_void, _orig_proto: AppProto) -> *mut std::os::raw::c_void {
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let state = KRB5State::new();
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let boxed = Box::new(state);
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return Box::into_raw(boxed) as *mut _;
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}
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/// Params:
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/// - state: *mut KRB5State as void pointer
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#[no_mangle]
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pub extern "C" fn rs_krb5_state_free(state: *mut std::os::raw::c_void) {
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let mut state: Box<KRB5State> = unsafe{Box::from_raw(state as _)};
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state.free();
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}
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#[no_mangle]
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pub unsafe extern "C" fn rs_krb5_state_get_tx(state: *mut std::os::raw::c_void,
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tx_id: u64)
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-> *mut std::os::raw::c_void
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{
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let state = cast_pointer!(state,KRB5State);
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match state.get_tx_by_id(tx_id) {
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Some(tx) => tx as *const _ as *mut _,
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None => std::ptr::null_mut(),
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}
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}
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#[no_mangle]
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pub unsafe extern "C" fn rs_krb5_state_get_tx_count(state: *mut std::os::raw::c_void)
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-> u64
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{
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let state = cast_pointer!(state,KRB5State);
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state.tx_id
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}
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#[no_mangle]
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pub unsafe extern "C" fn rs_krb5_state_tx_free(state: *mut std::os::raw::c_void,
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tx_id: u64)
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{
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let state = cast_pointer!(state,KRB5State);
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state.free_tx(tx_id);
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}
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#[no_mangle]
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pub extern "C" fn rs_krb5_tx_get_alstate_progress(_tx: *mut std::os::raw::c_void,
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_direction: u8)
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-> std::os::raw::c_int
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{
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1
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}
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static mut ALPROTO_KRB5 : AppProto = ALPROTO_UNKNOWN;
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#[no_mangle]
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pub unsafe extern "C" fn rs_krb5_probing_parser(_flow: *const Flow,
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_direction: u8,
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input:*const u8, input_len: u32,
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_rdir: *mut u8) -> AppProto
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{
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let slice = build_slice!(input,input_len as usize);
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let alproto = ALPROTO_KRB5;
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if slice.len() <= 10 { return ALPROTO_FAILED; }
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match der_read_element_header(slice) {
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Ok((rem, ref hdr)) => {
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// Kerberos messages start with an APPLICATION header
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if hdr.class() != Class::Application { return ALPROTO_FAILED; }
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// Tag number should be <= 30
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if hdr.tag().0 > 30 { return ALPROTO_FAILED; }
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// Kerberos messages contain sequences
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if rem.is_empty() || rem[0] != 0x30 { return ALPROTO_FAILED; }
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// Check kerberos version
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if let Ok((rem,_hdr)) = der_read_element_header(rem) {
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if rem.len() > 5 {
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#[allow(clippy::single_match)]
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match (rem[2],rem[3],rem[4]) {
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// Encoding of DER integer 5 (version)
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(2,1,5) => { return alproto; },
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_ => (),
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}
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}
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}
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return ALPROTO_FAILED;
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},
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Err(Err::Incomplete(_)) => {
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return ALPROTO_UNKNOWN;
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},
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Err(_) => {
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return ALPROTO_FAILED;
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},
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}
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}
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#[no_mangle]
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pub unsafe extern "C" fn rs_krb5_probing_parser_tcp(_flow: *const Flow,
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direction: u8,
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input:*const u8, input_len: u32,
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rdir: *mut u8) -> AppProto
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{
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let slice = build_slice!(input,input_len as usize);
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if slice.len() <= 14 { return ALPROTO_FAILED; }
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match be_u32(slice) as IResult<&[u8],u32> {
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Ok((rem, record_mark)) => {
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// protocol implementations forbid very large requests
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if record_mark > 16384 { return ALPROTO_FAILED; }
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return rs_krb5_probing_parser(_flow, direction,
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rem.as_ptr(), rem.len() as u32, rdir);
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},
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Err(Err::Incomplete(_)) => {
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return ALPROTO_UNKNOWN;
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},
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Err(_) => {
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return ALPROTO_FAILED;
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},
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}
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}
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#[no_mangle]
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pub unsafe extern "C" fn rs_krb5_parse_request(_flow: *const core::Flow,
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state: *mut std::os::raw::c_void,
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_pstate: *mut std::os::raw::c_void,
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stream_slice: StreamSlice,
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_data: *const std::os::raw::c_void,
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) -> AppLayerResult {
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let buf = stream_slice.as_slice();
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let state = cast_pointer!(state,KRB5State);
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if state.parse(buf, Direction::ToServer) < 0 {
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return AppLayerResult::err();
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}
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AppLayerResult::ok()
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}
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#[no_mangle]
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pub unsafe extern "C" fn rs_krb5_parse_response(_flow: *const core::Flow,
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state: *mut std::os::raw::c_void,
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_pstate: *mut std::os::raw::c_void,
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stream_slice: StreamSlice,
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_data: *const std::os::raw::c_void,
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) -> AppLayerResult {
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let buf = stream_slice.as_slice();
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let state = cast_pointer!(state,KRB5State);
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if state.parse(buf, Direction::ToClient) < 0 {
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return AppLayerResult::err();
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}
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AppLayerResult::ok()
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}
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#[no_mangle]
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pub unsafe extern "C" fn rs_krb5_parse_request_tcp(_flow: *const core::Flow,
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state: *mut std::os::raw::c_void,
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_pstate: *mut std::os::raw::c_void,
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stream_slice: StreamSlice,
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_data: *const std::os::raw::c_void,
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) -> AppLayerResult {
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let state = cast_pointer!(state,KRB5State);
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let buf = stream_slice.as_slice();
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let mut v : Vec<u8>;
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let tcp_buffer = match state.record_ts {
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0 => buf,
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_ => {
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// sanity check to avoid memory exhaustion
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if state.defrag_buf_ts.len() + buf.len() > 100000 {
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SCLogDebug!("rs_krb5_parse_request_tcp: TCP buffer exploded {} {}",
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state.defrag_buf_ts.len(), buf.len());
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return AppLayerResult::err();
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}
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v = state.defrag_buf_ts.split_off(0);
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v.extend_from_slice(buf);
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v.as_slice()
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}
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};
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let mut cur_i = tcp_buffer;
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while !cur_i.is_empty() {
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if state.record_ts == 0 {
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match be_u32(cur_i) as IResult<&[u8],u32> {
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Ok((rem,record)) => {
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state.record_ts = record as usize;
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cur_i = rem;
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},
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Err(Err::Incomplete(_)) => {
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state.defrag_buf_ts.extend_from_slice(cur_i);
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return AppLayerResult::ok();
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}
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_ => {
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SCLogDebug!("rs_krb5_parse_request_tcp: reading record mark failed!");
|
|
return AppLayerResult::err();
|
|
}
|
|
}
|
|
}
|
|
if cur_i.len() >= state.record_ts {
|
|
if state.parse(cur_i, Direction::ToServer) < 0 {
|
|
return AppLayerResult::err();
|
|
}
|
|
state.record_ts = 0;
|
|
cur_i = &cur_i[state.record_ts..];
|
|
} else {
|
|
// more fragments required
|
|
state.defrag_buf_ts.extend_from_slice(cur_i);
|
|
return AppLayerResult::ok();
|
|
}
|
|
}
|
|
AppLayerResult::ok()
|
|
}
|
|
|
|
#[no_mangle]
|
|
pub unsafe extern "C" fn rs_krb5_parse_response_tcp(_flow: *const core::Flow,
|
|
state: *mut std::os::raw::c_void,
|
|
_pstate: *mut std::os::raw::c_void,
|
|
stream_slice: StreamSlice,
|
|
_data: *const std::os::raw::c_void,
|
|
) -> AppLayerResult {
|
|
let state = cast_pointer!(state,KRB5State);
|
|
let buf = stream_slice.as_slice();
|
|
|
|
let mut v : Vec<u8>;
|
|
let tcp_buffer = match state.record_tc {
|
|
0 => buf,
|
|
_ => {
|
|
// sanity check to avoid memory exhaustion
|
|
if state.defrag_buf_tc.len() + buf.len() > 100000 {
|
|
SCLogDebug!("rs_krb5_parse_response_tcp: TCP buffer exploded {} {}",
|
|
state.defrag_buf_tc.len(), buf.len());
|
|
return AppLayerResult::err();
|
|
}
|
|
v = state.defrag_buf_tc.split_off(0);
|
|
v.extend_from_slice(buf);
|
|
v.as_slice()
|
|
}
|
|
};
|
|
let mut cur_i = tcp_buffer;
|
|
while !cur_i.is_empty() {
|
|
if state.record_tc == 0 {
|
|
match be_u32(cur_i) as IResult<&[u8],_> {
|
|
Ok((rem,record)) => {
|
|
state.record_tc = record as usize;
|
|
cur_i = rem;
|
|
},
|
|
Err(Err::Incomplete(_)) => {
|
|
state.defrag_buf_tc.extend_from_slice(cur_i);
|
|
return AppLayerResult::ok();
|
|
}
|
|
_ => {
|
|
SCLogDebug!("reading record mark failed!");
|
|
return AppLayerResult::ok();
|
|
}
|
|
}
|
|
}
|
|
if cur_i.len() >= state.record_tc {
|
|
if state.parse(cur_i, Direction::ToClient) < 0 {
|
|
return AppLayerResult::err();
|
|
}
|
|
state.record_tc = 0;
|
|
cur_i = &cur_i[state.record_tc..];
|
|
} else {
|
|
// more fragments required
|
|
state.defrag_buf_tc.extend_from_slice(cur_i);
|
|
return AppLayerResult::ok();
|
|
}
|
|
}
|
|
AppLayerResult::ok()
|
|
}
|
|
|
|
export_tx_data_get!(rs_krb5_get_tx_data, KRB5Transaction);
|
|
export_state_data_get!(rs_krb5_get_state_data, KRB5State);
|
|
|
|
const PARSER_NAME : &[u8] = b"krb5\0";
|
|
|
|
#[no_mangle]
|
|
pub unsafe extern "C" fn rs_register_krb5_parser() {
|
|
let default_port = CString::new("88").unwrap();
|
|
let mut parser = RustParser {
|
|
name : PARSER_NAME.as_ptr() as *const std::os::raw::c_char,
|
|
default_port : default_port.as_ptr(),
|
|
ipproto : core::IPPROTO_UDP,
|
|
probe_ts : Some(rs_krb5_probing_parser),
|
|
probe_tc : Some(rs_krb5_probing_parser),
|
|
min_depth : 0,
|
|
max_depth : 16,
|
|
state_new : rs_krb5_state_new,
|
|
state_free : rs_krb5_state_free,
|
|
tx_free : rs_krb5_state_tx_free,
|
|
parse_ts : rs_krb5_parse_request,
|
|
parse_tc : rs_krb5_parse_response,
|
|
get_tx_count : rs_krb5_state_get_tx_count,
|
|
get_tx : rs_krb5_state_get_tx,
|
|
tx_comp_st_ts : 1,
|
|
tx_comp_st_tc : 1,
|
|
tx_get_progress : rs_krb5_tx_get_alstate_progress,
|
|
get_eventinfo : Some(KRB5Event::get_event_info),
|
|
get_eventinfo_byid : Some(KRB5Event::get_event_info_by_id),
|
|
localstorage_new : None,
|
|
localstorage_free : None,
|
|
get_tx_files : None,
|
|
get_tx_iterator : Some(applayer::state_get_tx_iterator::<KRB5State, KRB5Transaction>),
|
|
get_tx_data : rs_krb5_get_tx_data,
|
|
get_state_data : rs_krb5_get_state_data,
|
|
apply_tx_config : None,
|
|
flags : 0,
|
|
truncate : None,
|
|
get_frame_id_by_name: None,
|
|
get_frame_name_by_id: None,
|
|
};
|
|
// register UDP parser
|
|
let ip_proto_str = CString::new("udp").unwrap();
|
|
if AppLayerProtoDetectConfProtoDetectionEnabled(ip_proto_str.as_ptr(), parser.name) != 0 {
|
|
let alproto = AppLayerRegisterProtocolDetection(&parser, 1);
|
|
// store the allocated ID for the probe function
|
|
ALPROTO_KRB5 = alproto;
|
|
if AppLayerParserConfParserEnabled(ip_proto_str.as_ptr(), parser.name) != 0 {
|
|
let _ = AppLayerRegisterParser(&parser, alproto);
|
|
}
|
|
} else {
|
|
SCLogDebug!("Protocol detector and parser disabled for KRB5/UDP.");
|
|
}
|
|
// register TCP parser
|
|
parser.ipproto = core::IPPROTO_TCP;
|
|
parser.probe_ts = Some(rs_krb5_probing_parser_tcp);
|
|
parser.probe_tc = Some(rs_krb5_probing_parser_tcp);
|
|
parser.parse_ts = rs_krb5_parse_request_tcp;
|
|
parser.parse_tc = rs_krb5_parse_response_tcp;
|
|
let ip_proto_str = CString::new("tcp").unwrap();
|
|
if AppLayerProtoDetectConfProtoDetectionEnabled(ip_proto_str.as_ptr(), parser.name) != 0 {
|
|
let alproto = AppLayerRegisterProtocolDetection(&parser, 1);
|
|
// store the allocated ID for the probe function
|
|
ALPROTO_KRB5 = alproto;
|
|
if AppLayerParserConfParserEnabled(ip_proto_str.as_ptr(), parser.name) != 0 {
|
|
let _ = AppLayerRegisterParser(&parser, alproto);
|
|
}
|
|
} else {
|
|
SCLogDebug!("Protocol detector and parser disabled for KRB5/TCP.");
|
|
}
|
|
}
|