129 lines
5.5 KiB
Python
129 lines
5.5 KiB
Python
"""
|
||
This plugin provides a command to perform DNS reconnaissance on a domain.
|
||
"""
|
||
|
||
import logging
|
||
import dns.resolver
|
||
import dns.reversename
|
||
import simplematrixbotlib as botlib
|
||
import re
|
||
|
||
from plugins.utils import is_public_destination
|
||
|
||
RECORD_TYPES = ['A', 'AAAA', 'MX', 'NS', 'TXT', 'CNAME', 'SOA', 'PTR', 'SRV']
|
||
|
||
def is_valid_domain(domain):
|
||
pattern = r'^(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}$'
|
||
return re.match(pattern, domain) is not None
|
||
|
||
def format_dns_record(record_type, records):
|
||
if not records:
|
||
return ""
|
||
output = f"<strong>{record_type} Records:</strong><br>"
|
||
for record in records:
|
||
output += f" • {record}<br>"
|
||
return output
|
||
|
||
async def query_dns_records(domain):
|
||
results = {}
|
||
resolver = dns.resolver.Resolver()
|
||
resolver.timeout = 5
|
||
resolver.lifetime = 5
|
||
for record_type in RECORD_TYPES:
|
||
try:
|
||
logging.info(f"Querying {record_type} records for {domain}")
|
||
answers = resolver.resolve(domain, record_type)
|
||
records = []
|
||
for rdata in answers:
|
||
if record_type == 'MX':
|
||
records.append(f"{rdata.preference} {rdata.exchange}")
|
||
elif record_type == 'SOA':
|
||
records.append(f"{rdata.mname} {rdata.rname}")
|
||
elif record_type == 'SRV':
|
||
records.append(f"{rdata.priority} {rdata.weight} {rdata.port} {rdata.target}")
|
||
elif record_type == 'TXT':
|
||
txt_data = ' '.join([s.decode() if isinstance(s, bytes) else str(s) for s in rdata.strings])
|
||
records.append(txt_data)
|
||
else:
|
||
records.append(str(rdata))
|
||
if records:
|
||
results[record_type] = records
|
||
logging.info(f"Found {len(records)} {record_type} record(s)")
|
||
except dns.resolver.NoAnswer:
|
||
continue
|
||
except dns.resolver.NXDOMAIN:
|
||
logging.warning(f"Domain {domain} does not exist")
|
||
return None
|
||
except dns.resolver.Timeout:
|
||
continue
|
||
except Exception as e:
|
||
logging.error(f"Error querying {record_type} for {domain}: {e}")
|
||
continue
|
||
return results
|
||
|
||
async def handle_command(room, message, bot, prefix, config):
|
||
match = botlib.MessageMatch(room, message, bot, prefix)
|
||
if match.is_not_from_this_bot() and match.prefix() and match.command("dns"):
|
||
logging.info("Received !dns command")
|
||
args = match.args()
|
||
if len(args) != 1:
|
||
await bot.api.send_text_message(room.room_id,
|
||
"Usage: !dns <domain>\nExample: !dns example.com")
|
||
return
|
||
domain = args[0].lower().strip()
|
||
domain = domain.replace('http://', '').replace('https://', '').rstrip('/')
|
||
if not is_valid_domain(domain):
|
||
await bot.api.send_text_message(room.room_id, f"Invalid domain name: {domain}")
|
||
return
|
||
try:
|
||
await bot.api.send_text_message(room.room_id,
|
||
f"🔍 Performing DNS reconnaissance on {domain}...")
|
||
results = await query_dns_records(domain)
|
||
if results is None:
|
||
await bot.api.send_text_message(room.room_id,
|
||
f"Domain {domain} does not exist (NXDOMAIN)")
|
||
return
|
||
if not results:
|
||
await bot.api.send_text_message(room.room_id,
|
||
f"No DNS records found for {domain}")
|
||
return
|
||
# SSRF / privacy check: if all A/AAAA records are private, refuse.
|
||
a_records = results.get('A', [])
|
||
aaaa_records = results.get('AAAA', [])
|
||
all_ips = a_records + aaaa_records
|
||
if all_ips and not any(is_public_destination(ip) for ip in all_ips):
|
||
await bot.api.send_text_message(room.room_id,
|
||
"❌ This domain resolves exclusively to private/internal IPs.")
|
||
return
|
||
output = f"<strong>🔍 DNS Records for {domain}</strong><br><br>"
|
||
preferred_order = ['A', 'AAAA', 'CNAME', 'MX', 'NS', 'TXT', 'SOA', 'SRV', 'PTR']
|
||
for record_type in preferred_order:
|
||
if record_type in results:
|
||
output += format_dns_record(record_type, results[record_type])
|
||
output += "<br>"
|
||
for record_type in results:
|
||
if record_type not in preferred_order:
|
||
output += format_dns_record(record_type, results[record_type])
|
||
output += "<br>"
|
||
if output.count('<br>') > 15:
|
||
output = f"<details><summary><strong>🔍 DNS Records for {domain}</strong></summary>{output}</details>"
|
||
await bot.api.send_markdown_message(room.room_id, output)
|
||
logging.info(f"Sent DNS records for {domain}")
|
||
except Exception as e:
|
||
await bot.api.send_text_message(room.room_id,
|
||
f"An error occurred while performing DNS lookup: {str(e)}")
|
||
logging.error(f"Error in DNS plugin for {domain}: {e}", exc_info=True)
|
||
|
||
# ---------------------------------------------------------------------------
|
||
# Plugin Metadata
|
||
# ---------------------------------------------------------------------------
|
||
__version__ = "1.0.1"
|
||
__author__ = "Funguy Bot"
|
||
__description__ = "DNS reconnaissance (SSRF‑safe)"
|
||
__help__ = """
|
||
<details>
|
||
<summary><strong>!dns</strong> – DNS reconnaissance</summary>
|
||
<p><code>!dns <domain></code> – Queries A, AAAA, MX, NS, TXT, CNAME, SOA, SRV, PTR records.</p>
|
||
</details>
|
||
"""
|