Xkeyscore Source Code Exclusive

Analysts do not need to read through millions of random emails. They use "selectors" to filter the noise. Selectors include: Email addresses and phone numbers. IP addresses and MAC addresses.

When a stream of raw binary data passes through the network card, XKeyscore feeds the stream into these parallel plugins simultaneously:

Inside XKEYSCORE: A Deep Dive into NSA’s Digital Dragnet Source Code

# Conceptual execution flow of an XKEYSCORE HTTP Extractor def extract_http_attributes(packet_payload): attributes = {} # Parse HTTP request line if packet_payload.startswith(b"GET") or packet_payload.startswith(b"POST"): headers, body = parse_http_stream(packet_payload) # Isolate critical selectors attributes['user_agent'] = headers.get('User-Agent') attributes['host'] = headers.get('Host') attributes['cookie_values'] = extract_cookies(headers.get('Cookie')) attributes['referer'] = headers.get('Referer') if body: attributes['form_data'] = parse_post_body(body) return attributes Use code with caution. Selector Matching xkeyscore source code exclusive

Searching for specific encryption software (e.g., TrueCrypt).

rule_id: EX_WEBMAIL_MONITOR_04 target_protocol: HTTP activation_status: ACTIVE match_conditions: - host: "://target-provider.com" - uri_path: "/updates/v1/stream" extraction_targets: - regex_match: "user=([^&]+)" assign_to: SELECTOR_EMAIL - regex_match: "sid=([^;]+)" assign_to: SELECTOR_SESSION_ID retention_policy: store_raw_payload: TRUE duration_days: 30 Use code with caution. Fingerprinting Anomalous Activity

This suggests that the core infrastructure is running modified versions of FreeBSD 8.3—a 13-year-old operating system. The security implications are staggering. The NSA is likely aware of over 150 unpatched kernel exploits in that version, but cannot reboot the server for fear of losing active session data. Analysts do not need to read through millions

To understand the scale, we must look at the database schema buried in the source. XKEYSCORE does not use SQL or standard NoSQL. It uses a binary columnar store called DB-XS . The source code includes a header file defining the "Master Index":

Tracking users who visit specific forums or use "suspicious" keywords. Filtering for VPN usage or Tor entry/exit nodes. Extractors:

The source code confirms the theoretical "Quantum Insert" attack is a standard XKEYSCORE plugin. When the system detects a target user visiting a specific URL (e.g., a Yahoo email login), the plugin injects a malicious iframe before the legitimate server can respond. The exclusive code block shows a time-to-live manipulation: IP addresses and MAC addresses

The exclusive source reveals a scoring algorithm (0 to 255) that rates "suspicion of obfuscation." Any score above 200 automatically triggers a of any WebRTC audio in the session.

To understand the gravity of the source code leak, one must first understand what XKEYSCORE is. Prior to 2013, the system was one of the NSA’s most closely guarded secrets. In essence, XKEYSCORE was described by insiders as the "Google for the NSA"—a distributed, real-time search and analysis system for the world’s digital communications [2†L36-L37].

While the system cannot instantly decrypt TLS/SSL payloads without key material, the code extracts unencrypted metadata during the handshake phase, including Server Name Indication (SNI) fields and SSL certificates. Identifying "Selectors"

The source code demonstrates automated extraction modules for unencrypted or weakly encrypted web traffic. It features code blocks designed to parse HTTP POST requests, automatically isolating fields containing strings like passwd , password , user , and login . 4. Federated Querying and the User Interface