Improve Gateway fingerprints and header/body coverage

honeypot.py

@@ -4,12 +4,14 @@ import argparse
 import base64
 import binascii
 import collections
+import gzip
 import email.parser
 import email.policy
 import hashlib
 import html
 import http.server
 import ipaddress
+import io
 import json
 import os
 import pathlib
@@ -60,6 +62,24 @@ STATIC = {
     '/logon/LogonPoint/receiver/js/ctxs.core.min.js': (b"window.CTXS=window.CTXS||{};CTXS.core={version:'1.0'};\n", JS),
 }
 
+# Synthetic translations; metadata matches the default 14.1-29.63 persona.
+# Source: Fox-IT citrix-netscaler-triage version timestamp catalog.
+ASSET_MTIME = env_int('HONEYPOT_ASSET_MTIME', 1723114781)
+for language in ('en', 'de'):
+    translation = {'LogOn': 'Log On' if language == 'en' else 'Anmelden',
+                   'UserName': 'User name' if language == 'en' else 'Benutzername',
+                   'Password': 'Password' if language == 'en' else 'Kennwort',
+                   'CitrixCopyright': 'Copyright (c) Citrix Systems, Inc.'}
+    for suffix in ('lang', 'lang-ext'):
+        path = f'/vpn/js/rdx/core/{suffix}/rdx_{language}.json'
+        encoded = json.dumps(translation, ensure_ascii=False).encode()
+        STATIC[path] = (encoded, 'application/json; charset=utf-8')
+        compressed = io.BytesIO()
+        with gzip.GzipFile(filename=f'rdx_{language}.json', mode='wb', fileobj=compressed,
+                           mtime=ASSET_MTIME) as stream:
+            stream.write(encoded)
+        STATIC[path + '.gz'] = (compressed.getvalue(), 'application/json; charset=utf-8')
+
 
 class Session:
     def __init__(self):
@@ -583,6 +603,20 @@ class Handler(http.server.BaseHTTPRequestHandler):
             return
         self.body_complete = True
         fields = self.capture_body(body)
+        # Hunt across all intake surfaces; labels are indicators, never CVE confirmation.
+        indicators = []
+        for source, value in [('header:' + k, v) for k, v in self.headers.raw_items()] + [
+                ('body', body[:65536].decode('utf-8', 'replace'))]:
+            decoded = urllib.parse.unquote_plus(value)
+            if re.search(r'pitboss|NSPPE', decoded, re.I):
+                indicators.append({'source': source, 'kind': 'netscaler-log-marker'})
+            if re.search(r'base64|b64decode|atob\s*\(', decoded, re.I):
+                indicators.append({'source': source, 'kind': 'encoded-content'})
+            if source.startswith('header:') and len(value) > 8192:
+                indicators.append({'source': source, 'kind': 'large-header'})
+        if indicators:
+            self.event('request_indicators', indicators=indicators,
+                       body_inspected_bytes=min(len(body), 65536), body_inspection_truncated=len(body) > 65536)
         try:
             url = urllib.parse.urlsplit(self.path)
         except ValueError:
@@ -603,10 +637,24 @@ class Handler(http.server.BaseHTTPRequestHandler):
             code, data, mime = 200, LOGIN, 'text/html; charset=utf-8'
             if url.path in STATIC:
                 data, mime = STATIC[url.path]
+                if url.path.endswith('.gz'):
+                    extra_headers.append(('Content-Encoding', 'gzip'))
+                extra_headers.append(('Last-Modified', self.date_time_string(ASSET_MTIME)))
             elif url.path.startswith('/nf/auth/'):
                 data = ('<AuthenticateResponse xmlns="http://citrix.com/authentication/response/1">'
                         '<Status>success</Status><Result>more-info</Result>'
                         '<StateContext>' + html.escape(state.sid) + '</StateContext>'
+                        '<AuthenticationRequirements><PostBack>/nf/auth/doAuthentication.do</PostBack>'
+                        '<Requirements>'
+                        '<Requirement><Credential><ID>login</ID><Type>username</Type></Credential>'
+                        '<Label><Text>User name:</Text><Type>plain</Type></Label>'
+                        '<Input><Text><InitialValue/><Constraint>.+</Constraint></Text></Input></Requirement>'
+                        '<Requirement><Credential><ID>passwd</ID><Type>password</Type></Credential>'
+                        '<Label><Text>Password:</Text><Type>plain</Type></Label>'
+                        '<Input><Text><Secret>true</Secret><InitialValue/><Constraint>.+</Constraint></Text></Input></Requirement>'
+                        '<Requirement><Credential><ID>nsg-x1-logon-button</ID><Type>none</Type></Credential>'
+                        '<Label><Type>none</Type></Label><Input><Button>Log On</Button></Input></Requirement>'
+                        '</Requirements></AuthenticationRequirements>'
                         '</AuthenticateResponse>').encode()
                 mime = 'application/vnd.citrix.authenticateresponse-1+xml; charset=utf-8'
             elif url.path.startswith('/nitro/'):