Added certificate fingerprints, issuers, subject fields, and storing unique domain records only
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EF4B922DB85DC9DE
@ -1,6 +1,6 @@
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#!/usr/bin/env python
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# Elasticsearch Recon Ingestion Scripts (ERIS) - Developed by Acidvegas (https://git.acid.vegas/eris)
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# ingest_certstream.py
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# ingestors/ingest_certstream.py
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import asyncio
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import json
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@ -16,10 +16,6 @@ except ImportError:
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# Set a default elasticsearch index if one is not provided
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default_index = 'eris-certstream'
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# Set the cache size for the Certstream records to prevent duplicates
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cache = []
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cache_size = 5000
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def construct_map() -> dict:
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'''Construct the Elasticsearch index mapping for Certstream records.'''
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@ -31,8 +27,20 @@ def construct_map() -> dict:
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mapping = {
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'mappings': {
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'properties' : {
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'domain' : keyword_mapping,
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'seen' : { 'type': 'date' }
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'domain' : keyword_mapping,
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'fingerprint' : keyword_mapping,
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'issuer' : keyword_mapping,
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'subject' : {
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'type' : 'object',
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'properties': {
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'C': { 'type': 'keyword' },
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'CN': { 'type': 'keyword' },
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'L': { 'type': 'keyword' },
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'O': { 'type': 'keyword' },
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'OU': { 'type': 'keyword' }
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}
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},
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'seen' : { 'type': 'date' }
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}
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}
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}
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@ -47,49 +55,52 @@ async def process_data(place_holder: str = None):
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:param place_holder: Placeholder parameter to match the process_data function signature of other ingestors.
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'''
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async for websocket in websockets.connect('wss://certstream.calidog.io', ping_interval=15, ping_timeout=60):
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# Loop until the user interrupts the process
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while True:
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try:
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# Read the websocket stream
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async for line in websocket:
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# Parse the JSON record
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try:
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record = json.loads(line)
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except json.decoder.JSONDecodeError:
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logging.error(f'Invalid line from the websocket: {line}')
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continue
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# Connect to the Certstream websocket
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async for websocket in websockets.connect('wss://certstream.calidog.io', ping_interval=15, ping_timeout=60):
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# Grab the unique domains from the records
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all_domains = set(record['data']['leaf_cert']['all_domains'])
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domains = list()
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# Read the websocket stream
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async for line in websocket:
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# We only care about subdomains (excluding www. and wildcards)
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for domain in all_domains:
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if domain.startswith('*.'):
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domain = domain[2:]
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if domain.startswith('www.') and domain.count('.') == 2:
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# Parse the JSON record
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try:
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record = json.loads(line)
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except json.decoder.JSONDecodeError:
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logging.error(f'Invalid line from the websocket: {line}')
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continue
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if domain.count('.') > 1:
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# TODO: Add a check for PSL TLDs...domain.co.uk, domain.com.au, etc. (we want to ignore these if they are not subdomains)
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if domain not in domains:
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domains.append(domain)
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# Construct the document
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for domain in domains:
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if domain in cache:
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continue # Skip the domain if it is already in the cache
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# Grab the unique domains from the records
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all_domains = set(record['data']['leaf_cert']['all_domains'])
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fingerprint = record['data']['leaf_cert']['fingerprint']
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issuer = record['data']['leaf_cert']['issuer']['O']
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subject = {k: v for k, v in record['data']['leaf_cert']['subject'].items() if v is not None}
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if len(cache) >= cache_size:
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cache.pop(0) # Remove the oldest domain from the cache
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# Create a record for each domain
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for domain in all_domains:
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if domain.startswith('*.'):
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domain = domain[2:]
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if domain in all_domains:
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continue
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cache.append(domain) # Add the domain to the cache
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# Construct the document
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struct = {
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'domain' : domain,
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'fingerprint' : fingerprint,
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'issuer' : issuer,
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'subject' : subject,
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'seen' : time.strftime('%Y-%m-%dT%H:%M:%SZ', time.gmtime())
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}
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struct = {
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'domain' : domain,
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'seen' : time.strftime('%Y-%m-%dT%H:%M:%SZ', time.gmtime())
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}
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yield {'_index': default_index, '_source': struct}
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yield {
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'_op_type' : 'update',
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'_id' : domain,
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'_index' : default_index,
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'doc' : struct,
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'doc_as_upsert' : True
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}
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except websockets.ConnectionClosed as e :
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logging.error(f'Connection to Certstream was closed. Attempting to reconnect... ({e})')
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@ -109,76 +120,4 @@ async def test():
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if __name__ == '__main__':
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asyncio.run(test())
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'''
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Output:
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{
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"data": {
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"cert_index": 43061646,
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"cert_link": "https://yeti2025.ct.digicert.com/log/ct/v1/get-entries?start=43061646&end=43061646",
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"leaf_cert": {
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"all_domains": [
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"*.d7zdnegbre53n.amplifyapp.com",
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"d7zdnegbre53n.amplifyapp.com"
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],
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"extensions": {
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"authorityInfoAccess" : "CA Issuers - URI:http://crt.r2m02.amazontrust.com/r2m02.cer\nOCSP - URI:http://ocsp.r2m02.amazontrust.com\n",
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"authorityKeyIdentifier" : "keyid:C0:31:52:CD:5A:50:C3:82:7C:74:71:CE:CB:E9:9C:F9:7A:EB:82:E2\n",
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"basicConstraints" : "CA:FALSE",
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"certificatePolicies" : "Policy: 2.23.140.1.2.1",
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"crlDistributionPoints" : "Full Name:\n URI:http://crl.r2m02.amazontrust.com/r2m02.crl",
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"ctlPoisonByte" : true,
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"extendedKeyUsage" : "TLS Web server authentication, TLS Web client authentication",
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"keyUsage" : "Digital Signature, Key Encipherment",
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"subjectAltName" : "DNS:d7zdnegbre53n.amplifyapp.com, DNS:*.d7zdnegbre53n.amplifyapp.com",
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"subjectKeyIdentifier" : "59:32:78:2A:11:03:62:55:BB:3B:B9:80:24:76:28:90:2E:D1:A4:56"
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},
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"fingerprint": "D9:05:A3:D5:AA:F9:68:BC:0C:0A:15:69:C9:5E:11:92:32:67:4F:FA",
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"issuer": {
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"C" : "US",
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"CN" : "Amazon RSA 2048 M02",
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"L" : null,
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"O" : "Amazon",
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"OU" : null,
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"ST" : null,
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"aggregated" : "/C=US/CN=Amazon RSA 2048 M02/O=Amazon",
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"emailAddress" : null
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},
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"not_after" : 1743811199,
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"not_before" : 1709596800,
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"serial_number" : "FDB450C1942E3D30A18737063449E62",
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"signature_algorithm" : "sha256, rsa",
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"subject": {
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"C" : null,
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"CN" : "*.d7zdnegbre53n.amplifyapp.com",
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"L" : null,
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"O" : null,
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"OU" : null,
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"ST" : null,
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"aggregated" : "/CN=*.d7zdnegbre53n.amplifyapp.com",
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"emailAddress" : null
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}
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},
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"seen": 1709651773.594684,
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"source": {
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"name" : "DigiCert Yeti2025 Log",
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"url" : "https://yeti2025.ct.digicert.com/log/"
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},
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"update_type": "PrecertLogEntry"
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},
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"message_type": "certificate_update"
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}
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Input:
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{
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"domain" : "d7zdnegbre53n.amplifyapp.com",
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"seen" : "2022-01-02T12:00:00Z"
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}
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Notes:
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- Fix the "no close frame received or sent" error
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'''
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asyncio.run(test())
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