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app-layer-modbus.c
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/*
* Copyright (C) 2014 ANSSI
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* \author David DIALLO <[email protected]>
*
* App-layer parser for Modbus protocol
*
*/
#include "suricata-common.h"
#include "util-debug.h"
#include "app-layer-parser.h"
#include "app-layer-modbus.h"
void ModbusParserRegisterTests(void);
/**
* \brief Function to register the Modbus protocol parser
*/
void RegisterModbusParsers(void)
{
rs_modbus_register_parser();
#ifdef UNITTESTS
AppLayerParserRegisterProtocolUnittests(IPPROTO_TCP, ALPROTO_MODBUS, ModbusParserRegisterTests);
#endif
SCReturn;
}
/* UNITTESTS */
#ifdef UNITTESTS
#include "detect.h"
#include "detect-engine.h"
#include "detect-parse.h"
#include "detect-engine-build.h"
#include "detect-engine-alert.h"
#include "flow-util.h"
#include "util-unittest.h"
#include "util-unittest-helper.h"
#include "stream-tcp.h"
#include "stream-tcp-private.h"
#include "rust.h"
/* Modbus default stream reassembly depth */
#define MODBUS_CONFIG_DEFAULT_STREAM_DEPTH 0
/* Modbus Application Protocol Specification V1.1b3 6.1: Read Coils */
static uint8_t invalidFunctionCode[] = {
/* Transaction ID */ 0x00, 0x00,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x02,
/* Unit ID */ 0x00,
/* Function code */ 0x00
};
/* Modbus Application Protocol Specification V1.1b3 6.1: Read Coils */
/* Example of a request to read discrete outputs 20-38 */
static uint8_t readCoilsReq[] = {/* Transaction ID */ 0x00, 0x00,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x06,
/* Unit ID */ 0x00,
/* Function code */ 0x01,
/* Starting Address */ 0x78, 0x90,
/* Quantity of coils */ 0x00, 0x13 };
static uint8_t readCoilsRsp[] = {/* Transaction ID */ 0x00, 0x00,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x06,
/* Unit ID */ 0x00,
/* Function code */ 0x01,
/* Byte count */ 0x03,
/* Coil Status */ 0xCD, 0x6B, 0x05 };
static uint8_t readCoilsErrorRsp[] = {
/* Transaction ID */ 0x00, 0x00,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x03,
/* Unit ID */ 0x00,
/* Function code */ 0x81,
/* Invalid Exception code: should trigger the InvalidExceptionCode ModbusEvent */
0xFF
};
/* Modbus Application Protocol Specification V1.1b3 6.6: Write Single register */
/* Example of a request to write register 2 to 00 03 hex */
static uint8_t writeSingleRegisterReq[] = {/* Transaction ID */ 0x00, 0x0A,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x06,
/* Unit ID */ 0x00,
/* Function code */ 0x06,
/* Register Address */ 0x00, 0x01,
/* Register Value */ 0x00, 0x03};
static uint8_t invalidWriteSingleRegisterReq[] = {/* Transaction ID */ 0x00, 0x0A,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x04,
/* Unit ID */ 0x00,
/* Function code */ 0x06,
/* Register Address */ 0x00, 0x01};
static uint8_t writeSingleRegisterRsp[] = {/* Transaction ID */ 0x00, 0x0A,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x06,
/* Unit ID */ 0x00,
/* Function code */ 0x06,
/* Register Address */ 0x00, 0x01,
/* Register Value */ 0x00, 0x03};
/* Modbus Application Protocol Specification V1.1b3 6.12: Write Multiple registers */
/* Example of a request to write two registers starting at 2 to 00 0A and 01 02 hex */
static uint8_t writeMultipleRegistersReq[] = {/* Transaction ID */ 0x00, 0x0A,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x0B,
/* Unit ID */ 0x00,
/* Function code */ 0x10,
/* Starting Address */ 0x00, 0x01,
/* Quantity of Registers */ 0x00, 0x02,
/* Byte count */ 0x04,
/* Registers Value */ 0x00, 0x0A,
0x01, 0x02};
static uint8_t writeMultipleRegistersRsp[] = {/* Transaction ID */ 0x00, 0x0A,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x06,
/* Unit ID */ 0x00,
/* Function code */ 0x10,
/* Starting Address */ 0x00, 0x01,
/* Quantity of Registers */ 0x00, 0x02};
/* Modbus Application Protocol Specification V1.1b3 6.16: Mask Write Register */
/* Example of a request to mask write to register 5 */
static uint8_t maskWriteRegisterReq[] = {/* Transaction ID */ 0x00, 0x0A,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x08,
/* Unit ID */ 0x00,
/* Function code */ 0x16,
/* Reference Address */ 0x00, 0x04,
/* And_Mask */ 0x00, 0xF2,
/* Or_Mask */ 0x00, 0x25};
static uint8_t invalidMaskWriteRegisterReq[] = {/* Transaction ID */ 0x00, 0x0A,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x06,
/* Unit ID */ 0x00,
/* Function code */ 0x16,
/* Reference Address */ 0x00, 0x04,
/* And_Mask */ 0x00, 0xF2};
static uint8_t maskWriteRegisterRsp[] = {/* Transaction ID */ 0x00, 0x0A,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x08,
/* Unit ID */ 0x00,
/* Function code */ 0x16,
/* Reference Address */ 0x00, 0x04,
/* And_Mask */ 0x00, 0xF2,
/* Or_Mask */ 0x00, 0x25};
/* Modbus Application Protocol Specification V1.1b3 6.17: Read/Write Multiple registers */
/* Example of a request to read six registers starting at register 4, */
/* and to write three registers starting at register 15 */
static uint8_t readWriteMultipleRegistersReq[] = {/* Transaction ID */ 0x12, 0x34,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x11,
/* Unit ID */ 0x00,
/* Function code */ 0x17,
/* Read Starting Address */ 0x00, 0x03,
/* Quantity to Read */ 0x00, 0x06,
/* Write Starting Address */ 0x00, 0x0E,
/* Quantity to Write */ 0x00, 0x03,
/* Write Byte count */ 0x06,
/* Write Registers Value */ 0x12, 0x34,
0x56, 0x78,
0x9A, 0xBC};
/* Mismatch value in Byte count 0x0B instead of 0x0C */
static uint8_t readWriteMultipleRegistersRsp[] = {/* Transaction ID */ 0x12, 0x34,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x0E,
/* Unit ID */ 0x00,
/* Function code */ 0x17,
/* Byte count */ 0x0B,
/* Read Registers Value */ 0x00, 0xFE,
0x0A, 0xCD,
0x00, 0x01,
0x00, 0x03,
0x00, 0x0D,
0x00};
/* Modbus Application Protocol Specification V1.1b3 6.8.1: 04 Force Listen Only Mode */
/* Example of a request to to remote device to its Listen Only Mode for Modbus Communications. */
static uint8_t forceListenOnlyMode[] = {/* Transaction ID */ 0x0A, 0x00,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x06,
/* Unit ID */ 0x00,
/* Function code */ 0x08,
/* Sub-function code */ 0x00, 0x04,
/* Data */ 0x00, 0x00};
static uint8_t invalidProtocolIdReq[] = {/* Transaction ID */ 0x00, 0x00,
/* Protocol ID */ 0x00, 0x01,
/* Length */ 0x00, 0x06,
/* Unit ID */ 0x00,
/* Function code */ 0x01,
/* Starting Address */ 0x78, 0x90,
/* Quantity of coils */ 0x00, 0x13 };
static uint8_t invalidLengthWriteMultipleRegistersReq[] = {
/* Transaction ID */ 0x00, 0x0A,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x09,
/* Unit ID */ 0x00,
/* Function code */ 0x10,
/* Starting Address */ 0x00, 0x01,
/* Quantity of Registers */ 0x00, 0x02,
/* Byte count */ 0x04,
/* Registers Value */ 0x00, 0x0A,
0x01, 0x02};
static uint8_t exceededLengthWriteMultipleRegistersReq[] = {
/* Transaction ID */ 0x00, 0x0A,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0xff, 0xfa,
/* Unit ID */ 0x00,
/* Function code */ 0x10,
/* Starting Address */ 0x00, 0x01,
/* Quantity of Registers */ 0x7f, 0xf9,
/* Byte count */ 0xff};
static uint8_t invalidLengthPDUWriteMultipleRegistersReq[] = {
/* Transaction ID */ 0x00, 0x0A,
/* Protocol ID */ 0x00, 0x00,
/* Length */ 0x00, 0x02,
/* Unit ID */ 0x00,
/* Function code */ 0x10};
/** \test Send Modbus Read Coils request/response. */
static int ModbusParserTest01(void) {
AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
Flow f;
TcpSession ssn;
FAIL_IF_NULL(alp_tctx);
memset(&f, 0, sizeof(f));
memset(&ssn, 0, sizeof(ssn));
FLOW_INITIALIZE(&f);
f.protoctx = (void *)&ssn;
f.proto = IPPROTO_TCP;
f.alproto = ALPROTO_MODBUS;
StreamTcpInitConfig(true);
int r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOSERVER, readCoilsReq,
sizeof(readCoilsReq));
FAIL_IF_NOT(r == 0);
ModbusState *modbus_state = f.alstate;
FAIL_IF_NULL(modbus_state);
ModbusMessage request = rs_modbus_state_get_tx_request(modbus_state, 0);
FAIL_IF_NULL(request._0);
FAIL_IF_NOT(rs_modbus_message_get_function(&request) == 1);
FAIL_IF_NOT(rs_modbus_message_get_read_request_address(&request) == 0x7890);
FAIL_IF_NOT(rs_modbus_message_get_read_request_quantity(&request) == 19);
r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOCLIENT, readCoilsRsp,
sizeof(readCoilsRsp));
FAIL_IF_NOT(r == 0);
FAIL_IF_NOT(rs_modbus_state_get_tx_count(modbus_state) == 1);
AppLayerParserThreadCtxFree(alp_tctx);
StreamTcpFreeConfig(true);
FLOW_DESTROY(&f);
PASS;
}
/** \test Send Modbus Write Multiple registers request/response. */
static int ModbusParserTest02(void) {
AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
Flow f;
TcpSession ssn;
FAIL_IF_NULL(alp_tctx);
memset(&f, 0, sizeof(f));
memset(&ssn, 0, sizeof(ssn));
FLOW_INITIALIZE(&f);
f.protoctx = (void *)&ssn;
f.proto = IPPROTO_TCP;
f.alproto = ALPROTO_MODBUS;
StreamTcpInitConfig(true);
int r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOSERVER, writeMultipleRegistersReq,
sizeof(writeMultipleRegistersReq));
FAIL_IF_NOT(r == 0);
ModbusState *modbus_state = f.alstate;
FAIL_IF_NULL(modbus_state);
ModbusMessage request = rs_modbus_state_get_tx_request(modbus_state, 0);
FAIL_IF_NULL(request._0);
FAIL_IF_NOT(rs_modbus_message_get_function(&request) == 16);
FAIL_IF_NOT(rs_modbus_message_get_write_multreq_address(&request) == 0x01);
FAIL_IF_NOT(rs_modbus_message_get_write_multreq_quantity(&request) == 2);
size_t data_len;
const uint8_t *data = rs_modbus_message_get_write_multreq_data(&request, &data_len);
FAIL_IF_NOT(data_len == 4);
FAIL_IF_NOT(data[0] == 0x00);
FAIL_IF_NOT(data[1] == 0x0A);
FAIL_IF_NOT(data[2] == 0x01);
FAIL_IF_NOT(data[3] == 0x02);
r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOCLIENT, writeMultipleRegistersRsp,
sizeof(writeMultipleRegistersRsp));
FAIL_IF_NOT(r == 0);
FAIL_IF_NOT(rs_modbus_state_get_tx_count(modbus_state) == 1);
AppLayerParserThreadCtxFree(alp_tctx);
StreamTcpFreeConfig(true);
FLOW_DESTROY(&f);
PASS;
}
/** \test Send Modbus Read/Write Multiple registers request/response with mismatch value. */
static int ModbusParserTest03(void) {
AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
DetectEngineThreadCtx *det_ctx = NULL;
Flow f;
Packet *p = NULL;
Signature *s = NULL;
TcpSession ssn;
ThreadVars tv;
FAIL_IF_NULL(alp_tctx);
memset(&tv, 0, sizeof(ThreadVars));
memset(&f, 0, sizeof(Flow));
memset(&ssn, 0, sizeof(TcpSession));
p = UTHBuildPacket(NULL, 0, IPPROTO_TCP);
FLOW_INITIALIZE(&f);
f.alproto = ALPROTO_MODBUS;
f.protoctx = (void *)&ssn;
f.proto = IPPROTO_TCP;
f.alproto = ALPROTO_MODBUS;
f.flags |= FLOW_IPV4;
p->flow = &f;
p->flags |= PKT_HAS_FLOW | PKT_STREAM_EST;
p->flowflags |= FLOW_PKT_TOSERVER | FLOW_PKT_ESTABLISHED;
StreamTcpInitConfig(true);
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
FAIL_IF_NULL(de_ctx);
de_ctx->flags |= DE_QUIET;
s = DetectEngineAppendSig(de_ctx, "alert modbus any any -> any any "
"(msg:\"Modbus Data mismatch\"; "
"app-layer-event: "
"modbus.value_mismatch; "
"sid:1;)");
FAIL_IF_NULL(s);
SigGroupBuild(de_ctx);
DetectEngineThreadCtxInit(&tv, (void *)de_ctx, (void *)&det_ctx);
int r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOSERVER,
readWriteMultipleRegistersReq,
sizeof(readWriteMultipleRegistersReq));
FAIL_IF_NOT(r == 0);
ModbusState *modbus_state = f.alstate;
FAIL_IF_NULL(modbus_state);
ModbusMessage request = rs_modbus_state_get_tx_request(modbus_state, 0);
FAIL_IF_NULL(request._0);
FAIL_IF_NOT(rs_modbus_message_get_function(&request) == 23);
FAIL_IF_NOT(rs_modbus_message_get_rw_multreq_read_address(&request) == 0x03);
FAIL_IF_NOT(rs_modbus_message_get_rw_multreq_read_quantity(&request) == 6);
FAIL_IF_NOT(rs_modbus_message_get_rw_multreq_write_address(&request) == 0x0E);
FAIL_IF_NOT(rs_modbus_message_get_rw_multreq_write_quantity(&request) == 3);
size_t data_len;
uint8_t const *data = rs_modbus_message_get_rw_multreq_write_data(&request, &data_len);
FAIL_IF_NOT(data_len == 6);
FAIL_IF_NOT(data[0] == 0x12);
FAIL_IF_NOT(data[1] == 0x34);
FAIL_IF_NOT(data[2] == 0x56);
FAIL_IF_NOT(data[3] == 0x78);
FAIL_IF_NOT(data[4] == 0x9A);
FAIL_IF_NOT(data[5] == 0xBC);
r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOCLIENT, readWriteMultipleRegistersRsp,
sizeof(readWriteMultipleRegistersRsp));
FAIL_IF_NOT(r == 0);
FAIL_IF_NOT(rs_modbus_state_get_tx_count(modbus_state) == 1);
/* do detect */
SigMatchSignatures(&tv, de_ctx, det_ctx, p);
FAIL_IF_NOT(PacketAlertCheck(p, 1));
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineThreadCtxDeinit(&tv, (void *)det_ctx);
DetectEngineCtxFree(de_ctx);
AppLayerParserThreadCtxFree(alp_tctx);
StreamTcpFreeConfig(true);
FLOW_DESTROY(&f);
UTHFreePackets(&p, 1);
PASS;
}
/** \test Send Modbus Force Listen Only Mode request. */
static int ModbusParserTest04(void) {
AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
Flow f;
TcpSession ssn;
FAIL_IF_NULL(alp_tctx);
memset(&f, 0, sizeof(f));
memset(&ssn, 0, sizeof(ssn));
FLOW_INITIALIZE(&f);
f.protoctx = (void *)&ssn;
f.proto = IPPROTO_TCP;
f.alproto = ALPROTO_MODBUS;
StreamTcpInitConfig(true);
int r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOSERVER, forceListenOnlyMode,
sizeof(forceListenOnlyMode));
FAIL_IF_NOT(r == 0);
ModbusState *modbus_state = f.alstate;
FAIL_IF_NULL(modbus_state);
ModbusMessage request = rs_modbus_state_get_tx_request(modbus_state, 0);
FAIL_IF_NULL(request._0);
FAIL_IF_NOT(rs_modbus_message_get_function(&request) == 8);
FAIL_IF_NOT(rs_modbus_message_get_subfunction(&request) == 4);
AppLayerParserThreadCtxFree(alp_tctx);
StreamTcpFreeConfig(true);
FLOW_DESTROY(&f);
PASS;
}
/** \test Send Modbus invalid Protocol version in request. */
static int ModbusParserTest05(void) {
AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
DetectEngineThreadCtx *det_ctx = NULL;
Flow f;
Packet *p = NULL;
Signature *s = NULL;
TcpSession ssn;
ThreadVars tv;
FAIL_IF_NULL(alp_tctx);
memset(&tv, 0, sizeof(ThreadVars));
memset(&f, 0, sizeof(Flow));
memset(&ssn, 0, sizeof(TcpSession));
p = UTHBuildPacket(NULL, 0, IPPROTO_TCP);
FLOW_INITIALIZE(&f);
f.alproto = ALPROTO_MODBUS;
f.protoctx = (void *)&ssn;
f.proto = IPPROTO_TCP;
f.alproto = ALPROTO_MODBUS;
f.flags |= FLOW_IPV4;
p->flow = &f;
p->flags |= PKT_HAS_FLOW | PKT_STREAM_EST;
p->flowflags |= FLOW_PKT_TOSERVER | FLOW_PKT_ESTABLISHED;
StreamTcpInitConfig(true);
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
FAIL_IF_NULL(de_ctx);
de_ctx->flags |= DE_QUIET;
s = DetectEngineAppendSig(de_ctx, "alert modbus any any -> any any "
"(msg:\"Modbus invalid Protocol version\"; "
"app-layer-event: "
"modbus.invalid_protocol_id; "
"sid:1;)");
FAIL_IF_NULL(s);
SigGroupBuild(de_ctx);
DetectEngineThreadCtxInit(&tv, (void *)de_ctx, (void *)&det_ctx);
int r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOSERVER, invalidProtocolIdReq,
sizeof(invalidProtocolIdReq));
FAIL_IF_NOT(r == 0);
ModbusState *modbus_state = f.alstate;
FAIL_IF_NULL(modbus_state);
/* do detect */
SigMatchSignatures(&tv, de_ctx, det_ctx, p);
FAIL_IF_NOT(PacketAlertCheck(p, 1));
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineThreadCtxDeinit(&tv, (void *)det_ctx);
DetectEngineCtxFree(de_ctx);
AppLayerParserThreadCtxFree(alp_tctx);
StreamTcpFreeConfig(true);
FLOW_DESTROY(&f);
UTHFreePackets(&p, 1);
PASS;
}
/** \test Send Modbus unsolicited response. */
static int ModbusParserTest06(void) {
AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
DetectEngineThreadCtx *det_ctx = NULL;
Flow f;
Packet *p = NULL;
Signature *s = NULL;
TcpSession ssn;
ThreadVars tv;
FAIL_IF_NULL(alp_tctx);
memset(&tv, 0, sizeof(ThreadVars));
memset(&f, 0, sizeof(Flow));
memset(&ssn, 0, sizeof(TcpSession));
p = UTHBuildPacket(NULL, 0, IPPROTO_TCP);
FLOW_INITIALIZE(&f);
f.alproto = ALPROTO_MODBUS;
f.protoctx = (void *)&ssn;
f.proto = IPPROTO_TCP;
f.alproto = ALPROTO_MODBUS;
f.flags |= FLOW_IPV4;
p->flow = &f;
p->flags |= PKT_HAS_FLOW | PKT_STREAM_EST;
p->flowflags |= FLOW_PKT_TOSERVER | FLOW_PKT_ESTABLISHED;
StreamTcpInitConfig(true);
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
FAIL_IF_NULL(de_ctx);
de_ctx->flags |= DE_QUIET;
s = DetectEngineAppendSig(de_ctx, "alert modbus any any -> any any "
"(msg:\"Modbus unsolicited response\"; "
"app-layer-event: "
"modbus.unsolicited_response; "
"sid:1;)");
FAIL_IF_NULL(s);
SigGroupBuild(de_ctx);
DetectEngineThreadCtxInit(&tv, (void *)de_ctx, (void *)&det_ctx);
int r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOCLIENT, readCoilsRsp,
sizeof(readCoilsRsp));
FAIL_IF_NOT(r == 0);
ModbusState *modbus_state = f.alstate;
FAIL_IF_NULL(modbus_state);
/* do detect */
SigMatchSignatures(&tv, de_ctx, det_ctx, p);
FAIL_IF_NOT(PacketAlertCheck(p, 1));
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineThreadCtxDeinit(&tv, (void *)det_ctx);
DetectEngineCtxFree(de_ctx);
AppLayerParserThreadCtxFree(alp_tctx);
StreamTcpFreeConfig(true);
FLOW_DESTROY(&f);
UTHFreePackets(&p, 1);
PASS;
}
/** \test Send Modbus invalid Length request. */
static int ModbusParserTest07(void) {
AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
DetectEngineThreadCtx *det_ctx = NULL;
Flow f;
Packet *p = NULL;
Signature *s = NULL;
TcpSession ssn;
ThreadVars tv;
FAIL_IF_NULL(alp_tctx);
memset(&tv, 0, sizeof(ThreadVars));
memset(&f, 0, sizeof(Flow));
memset(&ssn, 0, sizeof(TcpSession));
p = UTHBuildPacket(NULL, 0, IPPROTO_TCP);
FLOW_INITIALIZE(&f);
f.alproto = ALPROTO_MODBUS;
f.protoctx = (void *)&ssn;
f.proto = IPPROTO_TCP;
f.alproto = ALPROTO_MODBUS;
f.flags |= FLOW_IPV4;
p->flow = &f;
p->flags |= PKT_HAS_FLOW | PKT_STREAM_EST;
p->flowflags |= FLOW_PKT_TOSERVER | FLOW_PKT_ESTABLISHED;
StreamTcpInitConfig(true);
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
FAIL_IF_NULL(de_ctx);
de_ctx->flags |= DE_QUIET;
s = DetectEngineAppendSig(de_ctx, "alert modbus any any -> any any "
"(msg:\"Modbus invalid Length\"; "
"app-layer-event: "
"modbus.invalid_length; "
"sid:1;)");
FAIL_IF_NULL(s);
SigGroupBuild(de_ctx);
DetectEngineThreadCtxInit(&tv, (void *)de_ctx, (void *)&det_ctx);
int r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOSERVER,
invalidLengthWriteMultipleRegistersReq,
sizeof(invalidLengthWriteMultipleRegistersReq));
FAIL_IF_NOT(r == 1);
ModbusState *modbus_state = f.alstate;
FAIL_IF_NULL(modbus_state);
/* do detect */
SigMatchSignatures(&tv, de_ctx, det_ctx, p);
FAIL_IF_NOT(PacketAlertCheck(p, 1));
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineThreadCtxDeinit(&tv, (void *)det_ctx);
DetectEngineCtxFree(de_ctx);
AppLayerParserThreadCtxFree(alp_tctx);
StreamTcpFreeConfig(true);
FLOW_DESTROY(&f);
UTHFreePackets(&p, 1);
PASS;
}
/** \test Send Modbus Read Coils request and error response with Exception code invalid. */
static int ModbusParserTest08(void) {
AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
DetectEngineThreadCtx *det_ctx = NULL;
Flow f;
Packet *p = NULL;
Signature *s = NULL;
TcpSession ssn;
ThreadVars tv;
FAIL_IF_NULL(alp_tctx);
memset(&tv, 0, sizeof(ThreadVars));
memset(&f, 0, sizeof(Flow));
memset(&ssn, 0, sizeof(TcpSession));
p = UTHBuildPacket(NULL, 0, IPPROTO_TCP);
FLOW_INITIALIZE(&f);
f.alproto = ALPROTO_MODBUS;
f.protoctx = (void *)&ssn;
f.proto = IPPROTO_TCP;
f.alproto = ALPROTO_MODBUS;
f.flags |= FLOW_IPV4;
p->flow = &f;
p->flags |= PKT_HAS_FLOW | PKT_STREAM_EST;
p->flowflags |= FLOW_PKT_TOSERVER | FLOW_PKT_ESTABLISHED;
StreamTcpInitConfig(true);
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
FAIL_IF_NULL(de_ctx);
de_ctx->flags |= DE_QUIET;
s = DetectEngineAppendSig(de_ctx, "alert modbus any any -> any any "
"(msg:\"Modbus Exception code invalid\"; "
"app-layer-event: "
"modbus.invalid_exception_code; "
"sid:1;)");
FAIL_IF_NULL(s);
SigGroupBuild(de_ctx);
DetectEngineThreadCtxInit(&tv, (void *)de_ctx, (void *)&det_ctx);
int r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOSERVER, readCoilsReq,
sizeof(readCoilsReq));
FAIL_IF_NOT(r == 0);
ModbusState *modbus_state = f.alstate;
FAIL_IF_NULL(modbus_state);
ModbusMessage request = rs_modbus_state_get_tx_request(modbus_state, 0);
FAIL_IF_NULL(request._0);
FAIL_IF_NOT(rs_modbus_message_get_function(&request) == 1);
FAIL_IF_NOT(rs_modbus_message_get_read_request_address(&request) == 0x7890);
FAIL_IF_NOT(rs_modbus_message_get_read_request_quantity(&request) == 19);
r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOCLIENT, readCoilsErrorRsp,
sizeof(readCoilsErrorRsp));
FAIL_IF_NOT(r == 0);
FAIL_IF_NOT(rs_modbus_state_get_tx_count(modbus_state) == 1);
/* do detect */
SigMatchSignatures(&tv, de_ctx, det_ctx, p);
FAIL_IF_NOT(PacketAlertCheck(p, 1));
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineThreadCtxDeinit(&tv, (void *)det_ctx);
DetectEngineCtxFree(de_ctx);
AppLayerParserThreadCtxFree(alp_tctx);
StreamTcpFreeConfig(true);
FLOW_DESTROY(&f);
UTHFreePackets(&p, 1);
PASS;
}
/** \test Modbus fragmentation - 1 ADU over 2 TCP packets. */
static int ModbusParserTest09(void) {
AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
Flow f;
TcpSession ssn;
uint32_t input_len = sizeof(readCoilsReq), part2_len = 3;
uint8_t *input = readCoilsReq;
FAIL_IF_NULL(alp_tctx);
memset(&f, 0, sizeof(f));
memset(&ssn, 0, sizeof(ssn));
FLOW_INITIALIZE(&f);
f.protoctx = (void *)&ssn;
f.proto = IPPROTO_TCP;
f.alproto = ALPROTO_MODBUS;
StreamTcpInitConfig(true);
int r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOSERVER, input, input_len - part2_len);
FAIL_IF_NOT(r == 1);
r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOSERVER, input, input_len);
FAIL_IF_NOT(r == 0);
ModbusState *modbus_state = f.alstate;
FAIL_IF_NULL(modbus_state);
ModbusMessage request = rs_modbus_state_get_tx_request(modbus_state, 0);
FAIL_IF_NULL(request._0);
FAIL_IF_NOT(rs_modbus_message_get_function(&request) == 1);
FAIL_IF_NOT(rs_modbus_message_get_read_request_address(&request) == 0x7890);
FAIL_IF_NOT(rs_modbus_message_get_read_request_quantity(&request) == 19);
input_len = sizeof(readCoilsRsp);
part2_len = 10;
input = readCoilsRsp;
r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOCLIENT, input, input_len - part2_len);
FAIL_IF_NOT(r == 1);
r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOCLIENT, input, input_len);
FAIL_IF_NOT(r == 0);
FAIL_IF_NOT(rs_modbus_state_get_tx_count(modbus_state) == 1);
AppLayerParserThreadCtxFree(alp_tctx);
StreamTcpFreeConfig(true);
FLOW_DESTROY(&f);
PASS;
}
/** \test Modbus fragmentation - 2 ADU in 1 TCP packet. */
static int ModbusParserTest10(void) {
uint32_t input_len = sizeof(readCoilsReq) + sizeof(writeMultipleRegistersReq);
uint8_t *input, *ptr;
AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
Flow f;
TcpSession ssn;
FAIL_IF_NULL(alp_tctx);
input = (uint8_t *) SCMalloc (input_len * sizeof(uint8_t));
FAIL_IF_NULL(input);
memcpy(input, readCoilsReq, sizeof(readCoilsReq));
memcpy(input + sizeof(readCoilsReq), writeMultipleRegistersReq, sizeof(writeMultipleRegistersReq));
memset(&f, 0, sizeof(f));
memset(&ssn, 0, sizeof(ssn));
FLOW_INITIALIZE(&f);
f.protoctx = (void *)&ssn;
f.proto = IPPROTO_TCP;
f.alproto = ALPROTO_MODBUS;
StreamTcpInitConfig(true);
int r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS,
STREAM_TOSERVER, input, input_len);
FAIL_IF_NOT(r == 0);
ModbusState *modbus_state = f.alstate;
FAIL_IF_NULL(modbus_state);
FAIL_IF_NOT(rs_modbus_state_get_tx_count(modbus_state) == 2);
ModbusMessage request = rs_modbus_state_get_tx_request(modbus_state, 1);
FAIL_IF_NULL(request._0);
FAIL_IF_NOT(rs_modbus_message_get_function(&request) == 16);
FAIL_IF_NOT(rs_modbus_message_get_write_multreq_address(&request) == 0x01);
FAIL_IF_NOT(rs_modbus_message_get_write_multreq_quantity(&request) == 2);
size_t data_len;
uint8_t const *data = rs_modbus_message_get_write_multreq_data(&request, &data_len);
FAIL_IF_NOT(data_len == 4);
FAIL_IF_NOT(data[0] == 0x00);
FAIL_IF_NOT(data[1] == 0x0A);
FAIL_IF_NOT(data[2] == 0x01);
FAIL_IF_NOT(data[3] == 0x02);
input_len = sizeof(readCoilsRsp) + sizeof(writeMultipleRegistersRsp);
ptr = (uint8_t *) SCRealloc (input, input_len * sizeof(uint8_t));
FAIL_IF_NULL(ptr);
input = ptr;
memcpy(input, readCoilsRsp, sizeof(readCoilsRsp));
memcpy(input + sizeof(readCoilsRsp), writeMultipleRegistersRsp, sizeof(writeMultipleRegistersRsp));
r = AppLayerParserParse(NULL, alp_tctx, &f, ALPROTO_MODBUS, STREAM_TOCLIENT, input, input_len);
FAIL_IF_NOT(r == 0);
SCFree(input);
AppLayerParserThreadCtxFree(alp_tctx);
StreamTcpFreeConfig(true);
FLOW_DESTROY(&f);
PASS;
}
/** \test Send Modbus exceed Length request. */
static int ModbusParserTest11(void) {
AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
DetectEngineThreadCtx *det_ctx = NULL;
Flow f;
Packet *p = NULL;
Signature *s = NULL;
TcpSession ssn;
ThreadVars tv;
size_t input_len = 65536;
uint8_t *input = SCCalloc(1, input_len);
FAIL_IF(input == NULL);
memcpy(input, exceededLengthWriteMultipleRegistersReq,
sizeof(exceededLengthWriteMultipleRegistersReq));
FAIL_IF(alp_tctx == NULL);
memset(&tv, 0, sizeof(ThreadVars));
memset(&f, 0, sizeof(Flow));
memset(&ssn, 0, sizeof(TcpSession));
p = UTHBuildPacket(NULL, 0, IPPROTO_TCP);
FLOW_INITIALIZE(&f);
f.alproto = ALPROTO_MODBUS;
f.protoctx = (void *)&ssn;
f.proto = IPPROTO_TCP;
f.alproto = ALPROTO_MODBUS;
f.flags |= FLOW_IPV4;
p->flow = &f;
p->flags |= PKT_HAS_FLOW | PKT_STREAM_EST;
p->flowflags |= FLOW_PKT_TOSERVER | FLOW_PKT_ESTABLISHED;
StreamTcpInitConfig(true);
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
FAIL_IF_NULL(de_ctx);
de_ctx->flags |= DE_QUIET;
s = DetectEngineAppendSig(de_ctx, "alert modbus any any -> any any "
"(msg:\"Modbus invalid Length\"; "
"app-layer-event: "
"modbus.invalid_length; "
"sid:1;)");
FAIL_IF_NULL(s);
SigGroupBuild(de_ctx);
DetectEngineThreadCtxInit(&tv, (void *)de_ctx, (void *)&det_ctx);
int r = AppLayerParserParse(
NULL, alp_tctx, &f, ALPROTO_MODBUS, STREAM_TOSERVER, input, input_len);
FAIL_IF_NOT(r == 0);
ModbusState *modbus_state = f.alstate;
FAIL_IF_NULL(modbus_state);
/* do detect */
SigMatchSignatures(&tv, de_ctx, det_ctx, p);
FAIL_IF_NOT(PacketAlertCheck(p, 1));
SigGroupCleanup(de_ctx);
SigCleanSignatures(de_ctx);
DetectEngineThreadCtxDeinit(&tv, (void *)det_ctx);
DetectEngineCtxFree(de_ctx);