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Extract TLS Fingerprints from a given PCAP

Installation

  1. pip2 install ipaddress
  2. pip2 install scapy-ssl_tls

Note:

  • Must use Python 2, because scapy-ssl_tls does not work on Python 3.

Reference: Scapy-SSL/TLS

Usage

python2 get_fingerprint.py [path_of_pcap]

The result is printed on stdout. Each line of the result is a JSON object in the form of either...

  • type: client_hello
  • fingerprint: The client hello fingerprint
  • device_ip and device_port: IP and port of the device
  • remote_ip and remote_port: IP and port of the remote endpoint
  • weak_ciphers: A space-sparated list of weak ciphers being proposed by the client.
  • client_version: Max TLS version supported by client.
  • sni: SNI, if used; otherwise, empty string.

or...

  • type: server_hello --- the response
  • cipher_suite: The cipher agreed by the server; only weak cipher is shown. If empty, no weak cipher is used by server.
  • device_ip, device_port, remote_ip, remote_port: These should match those of the corresponding client hello.

Note:

  • Must use Python 2.
  • If there are multiple pcap files, wrap get_fingerprint.py in a loop, e.g., ls *.pcap | xargs -I XX python2 get_fingerprint.py XX.

Example

Analyze the sample.pcap file in this directory.

$ python get_fingerprint.py sample.pcap 2>/dev/null | head
{"fingerprint": "991305d10f.SCTVFNA", "device_port": 36394, "weak_ciphers": "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA", "sni": "api.roku.com", "remote_port": 443, "client_version": "0x303", "device_ip": "10.42.0.119", "type": "client_hello", "remote_ip": "23.22.241.63"}
{"remote_port": 443, "device_ip": "10.42.0.119", "device_port": 36394, "cipher_suite": "", "version": 771, "type": "server_hello", "remote_ip": "23.22.241.63"}
{"fingerprint": "991305d10f.SCTVFNA", "device_port": 45743, "weak_ciphers": "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA", "sni": "api.roku.com", "remote_port": 443, "client_version": "0x303", "device_ip": "10.42.0.119", "type": "client_hello", "remote_ip": "52.45.134.131"}
{"remote_port": 443, "device_ip": "10.42.0.119", "device_port": 45743, "cipher_suite": "", "version": 771, "type": "server_hello", "remote_ip": "52.45.134.131"}
{"fingerprint": "991305d10f.SCTVFNA", "device_port": 36398, "weak_ciphers": "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA", "sni": "api.roku.com", "remote_port": 443, "client_version": "0x303", "device_ip": "10.42.0.119", "type": "client_hello", "remote_ip": "23.22.241.63"}
{"fingerprint": "991305d10f.SCTVFNA", "device_port": 44674, "weak_ciphers": "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA", "sni": "api.roku.com", "remote_port": 443, "client_version": "0x303", "device_ip": "10.42.0.119", "type": "client_hello", "remote_ip": "34.193.43.251"}
{"remote_port": 443, "device_ip": "10.42.0.119", "device_port": 36398, "cipher_suite": "", "version": 771, "type": "server_hello", "remote_ip": "23.22.241.63"}
{"remote_port": 443, "device_ip": "10.42.0.119", "device_port": 44674, "cipher_suite": "", "version": 771, "type": "server_hello", "remote_ip": "34.193.43.251"}
{"fingerprint": "991305d10f.SCTVFNA", "device_port": 56177, "weak_ciphers": "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA", "sni": "api.roku.com", "remote_port": 443, "client_version": "0x303", "device_ip": "10.42.0.119", "type": "client_hello", "remote_ip": "54.173.104.173"}