ssllog

ssllog is a term used to describe a logging facility, utility, or module that records SSL/TLS related events for applications that implement or utilize SSL/TLS. There is no universal standard named ssllog, and implementations vary across platforms and software. In general, ssllog serves as a persistent record of the activity and state of secure communications.

Common features associated with ssllog include configurable log formats (plain text or structured formats such as JSON), integration with system log services (such as syslog or journald), and support for log rotation and retention policies. Logs typically include timestamps, connection identifiers, protocol version, selected cipher suite, and session details. They may also capture certificate information (subject, issuer, validity, fingerprint), hostnames or Server Name Indication (SNI), and any handshake or protocol errors. Some implementations offer filtering by severity, domain, or connection attributes to reduce noise and protect privacy.

Deployment and usage vary: ssllog can be embedded directly in applications or provided as a separate daemon or library that collects TLS event data from the SSL/TLS stack in use (for example, OpenSSL, LibreSSL, or other TLS libraries). It is commonly used for debugging, auditing, performance monitoring, and compliance, especially on servers handling sensitive traffic.

Security and privacy considerations are important: log data can reveal detailed information about certificates, configurations, and traffic patterns. Access should be restricted, and sensitive data should be redacted or excluded where appropriate. Regular review and secure storage of logs are recommended.

Related concepts include TLS/SSL, certificate logging, and system logging facilities.