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fixerupper.py
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"""
FixerUpper v0.1
Author: Oliver Simonnet (@AppSecOllie)
Released as open source by F-Secure Labs (c) 2021
under BSD 3-Clause License. See LICENSE for more.
"""
from burp import IBurpExtender
from burp import IHttpListener
from burp import IMessageEditorTab
from burp import IMessageEditorTabFactory
from burp import ITab
from javax.swing import JScrollPane
from javax.swing import JPanel
from javax.swing import JButton
from javax.swing import JTextArea
from javax.swing import JLabel
from javax.swing import SwingConstants
from javax.swing import GroupLayout
from javax.swing.border import EmptyBorder
from java.awt import Dimension, Font, Color
import csv
import re
EXT_FILE_PATH = None
EXT_FILE_NAME = None
EXT_NAME = "Fixer Upper"
EXT_FIX_DICT = "FIX4.4.csv"
FIX_SOH = "\x01"
FIX_MSG_BODY_REGEX = ""
FIX_MSG_HEADERS_REGEX = []
class BurpExtender(IBurpExtender, IMessageEditorTabFactory, IHttpListener, ITab):
def registerExtenderCallbacks(self, callbacks):
self.callbacks = callbacks
self.helpers = callbacks.getHelpers()
global EXT_FILE_NAME, EXT_FILE_PATH
EXT_FILE_NAME = callbacks.getExtensionFilename().split("/")[-1]
EXT_FILE_PATH = callbacks.getExtensionFilename().replace(EXT_FILE_NAME, "")
self.raw_content = None
self.req_obj = None
self.req_headers = None
self.req_body = None
self.fixer = Fixer(FIX_SOH)
global FIX_MSG_BODY_REGEX, FIX_MSG_HEADERS_REGEX
FIX_MSG_BODY_REGEX = self.load_config("FIX_MSG_BODY_REGEX")
FIX_MSG_HEADERS_REGEX = self.load_config("FIX_MSG_HEADERS_REGEX")
callbacks.setExtensionName(EXT_NAME)
callbacks.addSuiteTab(self)
callbacks.registerHttpListener(self)
callbacks.registerMessageEditorTabFactory(self)
def createNewInstance(self, controller, editable):
return Display_data(self, controller, editable)
def processHttpMessage(self, toolFlag, messageIsRequest, messageInfo):
if messageIsRequest:
self.raw_content = messageInfo.getRequest()
if messageIsRequest:
self.req_obj = self.helpers.analyzeRequest(self.raw_content)
else:
self.req_obj = self.helpers.analyzeResponse(self.raw_content)
if self.req_obj != None:
self.req_headers = self.req_obj.getHeaders()
self.req_body = self.raw_content[(self.req_obj.getBodyOffset()):].tostring()
if self.fixer.validate_message(self.req_headers, self.req_body):
message = self.req_body
message = self.fixer.update_field(message, "9", self.fixer.calc_length(message))
message = self.fixer.update_field(message, "10", self.fixer.calc_chksum(message))
print(message.replace(FIX_SOH, "|"))
print("---------------------")
new_req = self.helpers.buildHttpMessage(self.req_obj.getHeaders(), message)
messageInfo.setRequest(new_req)
def getTabCaption(self):
return EXT_NAME
def save_criteria(self, event):
global FIX_MSG_HEADERS_REGEX, FIX_MSG_BODY_REGEX
FIX_MSG_HEADERS_REGEX = self.txtHeaderFlags.getText().split("\n")
FIX_MSG_BODY_REGEX = self.txtBodyFlags.getText().rstrip()
self.callbacks.saveExtensionSetting("FIX_MSG_BODY_REGEX", FIX_MSG_BODY_REGEX);
self.callbacks.saveExtensionSetting("FIX_MSG_HEADERS_REGEX", '\n'.join(FIX_MSG_HEADERS_REGEX));
print("--- CONFIG SAVED ---")
def getUiComponent(self):
panel = JPanel()
layout = GroupLayout(panel)
panel.setLayout(layout)
panel.setBorder(EmptyBorder(10, 10, 10, 10));
lblPanelHeading = JLabel(EXT_NAME + " Options", SwingConstants.LEFT)
lblPanelHeading.setFont(Font("Tahoma", Font.BOLD, 14))
lblPanelHeading.setForeground(Color(235,136,0))
globalwidth = 500
self.lblHeadFlags = JLabel("Required Header Patterns:", SwingConstants.LEFT)
self.txtHeaderFlags = JTextArea(2, 10)
self.txtHeaderFlags.setMaximumSize(Dimension(10, self.txtHeaderFlags.getPreferredSize().height))
self.txtHeaderFlags.setMinimumSize(Dimension(10, self.txtHeaderFlags.getPreferredSize().height))
self.pnlHeaderFlags = JScrollPane(self.txtHeaderFlags)
self.pnlHeaderFlags.setMaximumSize(Dimension(globalwidth, self.txtHeaderFlags.getPreferredSize().height * 2))
self.pnlHeaderFlags.setMinimumSize(Dimension(globalwidth, self.txtHeaderFlags.getPreferredSize().height * 2))
self.txtHeaderFlags.setText('\n'.join(FIX_MSG_HEADERS_REGEX))
self.lblBodyFlags = JLabel("Message Body Pattern:", SwingConstants.LEFT)
self.txtBodyFlags = JTextArea(2, 10)
self.txtBodyFlags.setMaximumSize(Dimension(10, self.txtBodyFlags.getPreferredSize().height))
self.txtBodyFlags.setMinimumSize(Dimension(10, self.txtBodyFlags.getPreferredSize().height))
self.pnlBodyFlags = JScrollPane(self.txtBodyFlags)
self.pnlBodyFlags.setMaximumSize(Dimension(globalwidth, self.txtBodyFlags.getPreferredSize().height * 2))
self.pnlBodyFlags.setMinimumSize(Dimension(globalwidth, self.txtBodyFlags.getPreferredSize().height * 2))
self.txtBodyFlags.setText(FIX_MSG_BODY_REGEX)
self.btnSubmit = JButton("Save", actionPerformed=self.save_criteria)
self.btnSubmit.setMaximumSize(Dimension(globalwidth, self.btnSubmit.getPreferredSize().height))
self.btnSubmit.setMinimumSize(Dimension(globalwidth, self.btnSubmit.getPreferredSize().height))
lblPanelContext = JLabel(
"These values define the criteria for whether a request should be processed as a FIX message or not",
SwingConstants.LEFT
)
lblPanelContext.setFont(Font("Tahoma", Font.ITALIC, 12))
# ----------------------------------
gl = GroupLayout.Alignment.LEADING
leftToRight = layout.createSequentialGroup()
col1 = layout.createParallelGroup(gl)
col1.addGap(10,10,10)
col1.addComponent(lblPanelHeading)
col1.addGap(10,10,10)
col1.addComponent(lblPanelContext)
col1.addGap(10,10,10)
col1.addComponent(self.lblHeadFlags)
col1.addComponent(self.pnlHeaderFlags)
col1.addGap(10,10,10)
col1.addComponent(self.lblBodyFlags)
col1.addComponent(self.pnlBodyFlags)
col1.addGap(10,10,10)
col1.addComponent(self.btnSubmit)
leftToRight.addGroup(col1)
leftToRight.addContainerGap(500, globalwidth)
# ----------------------------------
topToBottom = layout.createSequentialGroup()
topToBottom.addGroup(layout.createParallelGroup(gl).addGap(10,10,10))
topToBottom.addGroup(layout.createParallelGroup(gl).addComponent(lblPanelHeading))
topToBottom.addGroup(layout.createParallelGroup(gl).addGap(10,10,10))
topToBottom.addGroup(layout.createParallelGroup(gl).addComponent(lblPanelContext))
topToBottom.addGroup(layout.createParallelGroup(gl).addGap(10,10,10))
topToBottom.addGroup(layout.createParallelGroup(gl).addComponent(self.lblHeadFlags))
topToBottom.addGroup(layout.createParallelGroup(gl).addComponent(self.pnlHeaderFlags))
topToBottom.addGroup(layout.createParallelGroup(gl).addGap(10,10,10))
topToBottom.addGroup(layout.createParallelGroup(gl).addComponent(self.lblBodyFlags))
topToBottom.addGroup(layout.createParallelGroup(gl).addComponent(self.pnlBodyFlags))
topToBottom.addGroup(layout.createParallelGroup(gl).addGap(10,10,10))
topToBottom.addGroup(layout.createParallelGroup(gl).addComponent(self.btnSubmit))
layout.setHorizontalGroup(leftToRight)
layout.setVerticalGroup(topToBottom)
return panel
def load_config(self, config_name):
config_value = self.callbacks.loadExtensionSetting(config_name)
if config_value == None:
if config_name == "FIX_MSG_BODY_REGEX":
config_value = r"^8=FIX\.4\..*10\=[0-9]{3}"
elif config_name == "FIX_MSG_HEADERS_REGEX":
config_value = ["^X-Mitm_Relay-To:.*", "^X-Mitm_Relay-From:.*"]
if config_name == "FIX_MSG_HEADERS_REGEX" and "\n" in config_value:
config_value = config_value.split("\n")
return config_value
class Display_data(IMessageEditorTab):
def __init__(self, extender, controller, editable):
self.extender = extender
self.controller = controller
self.editable = editable
self.editor = extender.callbacks.createTextEditor()
self.helpers = extender.helpers
self.raw_content = None
self.req_obj = None
self.req_headers = None
self.req_body = None
self.fixer = Fixer(FIX_SOH)
def getUiComponent(self):
return self.editor.getComponent()
def getTabCaption(self):
return EXT_NAME
def getSelectedData(self):
return self.editor.getSelectedText()
def isModified(self):
return self.editor.isTextModified()
def isEnabled(self, content, isRequest):
self.raw_content = content
if isRequest:
self.req_obj = self.helpers.analyzeRequest(self.raw_content)
else:
self.req_obj = self.helpers.analyzeResponse(self.raw_content)
if self.req_obj != None:
self.req_headers = self.req_obj.getHeaders()
self.req_body = self.raw_content[(self.req_obj.getBodyOffset()):].tostring()
if self.fixer.validate_message(self.req_headers, self.req_body):
return True
return False
def setMessage(self, content, isRequest):
if content is None:
self.editor.setText(None)
self.editor.setEditable(False)
else:
self.editor.setText(self.fixer.msg_expand(self.req_body))
def getMessage(self):
if(self.editor.isTextModified()):
return self.helpers.buildHttpMessage(self.req_headers,
self.fixer.msg_compress(self.editor.getText())
)
else:
return self.raw_content
class Fixer():
def __init__(self, SOH):
self.SOH = SOH
self.FIX_DICT = None
try:
with open(EXT_FILE_PATH + EXT_FIX_DICT, mode="r") as infile:
self.FIX_DICT = {
rows[0]:rows[1] for rows in csv.reader(infile)
}
except:
print("ERROR: " + EXT_FIX_DICT + " Not Found!")
self.FIX_DICT = {"MISSING":"MISSING"}
def update_field(self, message, flag, new_value):
msg_fields = message.split(self.SOH)
for i, field in enumerate(msg_fields):
if field.startswith(flag + "="):
msg_fields[i] = flag + "=" + str(new_value)
break
new_message = self.SOH.join(msg_fields)
return new_message
def calc_chksum(self, message):
checksum = 0
for c in message[:message.index("10=")]:
checksum += ord(c)
checksum = str(checksum % 256).zfill(3)
return checksum
def calc_length(self, message):
msg_fields = message.split(self.SOH)
length = len(self.SOH.join(msg_fields[2:-2]) + self.SOH)
return length
def validate_message(self, headers, body):
return (
all(
any(
re.match(re.compile(exp), h)
for h in headers
)
for exp in FIX_MSG_HEADERS_REGEX
)
and re.match(FIX_MSG_BODY_REGEX, body)
)
def get_field_name(self, field_num):
try:
return self.FIX_DICT[field_num]
except KeyError as e:
return "UNKNOWN"
def msg_expand(self, message):
fields = message.split(self.SOH)
output = ""
for field in fields:
if field != "":
field_pair = field.split("=")
field_name = self.get_field_name(field_pair[0])
output += field_pair[0]+"("+field_name+")=" + field_pair[1] + "\n"
return output
def msg_compress(self, message):
message = re.sub(r'\(.*\)\=', "=", message)
message = message.replace("\n", self.SOH)
message = message[:message.index("|10=")+8]
return message