zeek/zeek
May 2023 – Apr 2026
17 Months active
Languages Used
CZeek ScriptC++DockerfileGitYAMLZeekText
Technical Skills
C programmingdatabase managementsoftware optimizationNetwork Protocol AnalysisTestingBuild Automation
Johanna Amann
PROFILE
Johanna Amann
Over 17 months, contributed to the zeek/zeek repository by delivering 45 features and 11 bug fixes focused on network protocol analysis, security, and observability. Work included implementing unified analyzer logging, expanding cryptographic hashing in Zeek scripting, and enhancing SSL/TLS analysis with Spicy and OpenSSL integration. Leveraged C++ and Zeek scripting to modernize CI/CD pipelines, improve test automation, and ensure cross-platform compatibility. Efforts addressed protocol compliance, certificate parsing, and robust error handling, while maintaining detailed documentation and release notes. The technical approach emphasized maintainability, performance optimization, and reliable logging, supporting scalable deployments and improved diagnostics in production environments.
Overall Statistics
Feature vs Bugs
80%Features
Repository Contributions
88Total
Bugs
11
Commits
88
Features
45
Lines of code
55,837
Activity Months17
Your Network
94 peopleSame Organization
@corelight.com20
Shared Repositories
74
Work History
April 2026
6 Commits • 4 Features
Apr 1, 2026April 2026: Focused delivery across certificate parsing, TLS data interpretation, testing, and cryptography API stability in zeek/zeek. Key outcomes include cross-version OpenSSL compatibility for X509 parsing with diagnostics, clarified TLS 1.2/1.3 event data interpretation and warnings about TLS 1.2-only algorithms, expanded SSL testing to validate OpenSSL 3.5+ support using the ML-DSA-44 certificate, and modernization of key length calculations via EVP_PKEY_bits. These changes reduce maintenance burden, improve security posture, and increase deployment confidence across diverse environments (OpenSSL 3.x, Rocky Linux 8).
6 Commits • 4 Features
Apr 1, 2026April 2026: Focused delivery across certificate parsing, TLS data interpretation, testing, and cryptography API stability in zeek/zeek. Key outcomes include cross-version OpenSSL compatibility for X509 parsing with diagnostics, clarified TLS 1.2/1.3 event data interpretation and warnings about TLS 1.2-only algorithms, expanded SSL testing to validate OpenSSL 3.5+ support using the ML-DSA-44 certificate, and modernization of key length calculations via EVP_PKEY_bits. These changes reduce maintenance burden, improve security posture, and increase deployment confidence across diverse environments (OpenSSL 3.x, Rocky Linux 8).
April 2026
March 2026
1 Commits • 1 Features
Mar 1, 2026Monthly summary for 2026-03 focused on updating TLS constants to reflect new standards and RFC alignment in zeek/zeek. This work strengthens security compliance, improves maintainability, and positions the TLS subsystem for smoother audits and future RFC-driven updates.
March 2026
1 Commits • 1 Features
Mar 1, 2026Monthly summary for 2026-03 focused on updating TLS constants to reflect new standards and RFC alignment in zeek/zeek. This work strengthens security compliance, improves maintainability, and positions the TLS subsystem for smoother audits and future RFC-driven updates.
December 2025
3 Commits • 1 Features
Dec 1, 2025December 2025: Focused on SSL observability, test reliability, and IOC coverage for zeek/zeek. Delivered three items: (1) SSL Certificate Logging Reliability During Protocol Errors — introduced a log hook to ensure SSL fingerprints are captured when protocol errors occur after certificate transmission and added tests. (2) Spicy SSL Analyzer Test Stabilization — updated tests to verify presence of analyzer.log to accommodate tls-1.2 late-protocol-error scenarios. (3) Enhanced File Hash Policy: Add SHA256 support — extended the hash-all-files policy to emit SHA256 alongside MD5 and SHA1. These changes improve SSL observability during failures, stabilize tests for protocol-error scenarios, and widen IOC data for investigators.
3 Commits • 1 Features
Dec 1, 2025December 2025: Focused on SSL observability, test reliability, and IOC coverage for zeek/zeek. Delivered three items: (1) SSL Certificate Logging Reliability During Protocol Errors — introduced a log hook to ensure SSL fingerprints are captured when protocol errors occur after certificate transmission and added tests. (2) Spicy SSL Analyzer Test Stabilization — updated tests to verify presence of analyzer.log to accommodate tls-1.2 late-protocol-error scenarios. (3) Enhanced File Hash Policy: Add SHA256 support — extended the hash-all-files policy to emit SHA256 alongside MD5 and SHA1. These changes improve SSL observability during failures, stabilize tests for protocol-error scenarios, and widen IOC data for investigators.
December 2025
November 2025
1 Commits • 1 Features
Nov 1, 2025Month: 2025-11 — Feature delivery in zeek/zeek focused on SNMPv3 observability, security, and RFC3414 alignment. Implemented SNMPv3 Username Extraction by parsing UserSecurityModel Security Parameters, replacing the community string with the username in SNMPv3 logs, and enhancing SNMPv3 packet handling. This improves log clarity, reduces risk of sensitive data exposure, and enhances incident investigation. The change adds username to header records and snmp.log for SNMPv3 requests, aligning with RFC3414 standards and supporting better metrics and troubleshooting. Commit reference: 9a0b7ce3e1f5ac96ae186f7d181d2158eefc71c6.
November 2025
1 Commits • 1 Features
Nov 1, 2025Month: 2025-11 — Feature delivery in zeek/zeek focused on SNMPv3 observability, security, and RFC3414 alignment. Implemented SNMPv3 Username Extraction by parsing UserSecurityModel Security Parameters, replacing the community string with the username in SNMPv3 logs, and enhancing SNMPv3 packet handling. This improves log clarity, reduces risk of sensitive data exposure, and enhances incident investigation. The change adds username to header records and snmp.log for SNMPv3 requests, aligning with RFC3414 standards and supporting better metrics and troubleshooting. Commit reference: 9a0b7ce3e1f5ac96ae186f7d181d2158eefc71c6.
October 2025
5 Commits • 3 Features
Oct 1, 2025October 2025 monthly summary for zeek/zeek. Delivered significant cryptographic and networking enhancements, expanded file hashing capabilities, and root-level stability improvements across platforms. Key features span cryptographic hashing in Zeek scripting (SHA512, SHA224, SHA384 BiFs with one-shot and incremental hashing, plus opaque value serialization/cloning), a new TCP::raw_options BiF for accessing raw TCP option data with tests/docs, and an extended file hash analyzer to include SHA224/384/512. Critical bug fixes addressed initialization stability for SHA384 across environments and UBSAN-related handling for empty TCP option data, improving reliability in CI and production deployments. These contributions increase security tooling, data integrity checks, and network forensics capabilities, offering tangible business value and cross-platform consistency.
5 Commits • 3 Features
Oct 1, 2025October 2025 monthly summary for zeek/zeek. Delivered significant cryptographic and networking enhancements, expanded file hashing capabilities, and root-level stability improvements across platforms. Key features span cryptographic hashing in Zeek scripting (SHA512, SHA224, SHA384 BiFs with one-shot and incremental hashing, plus opaque value serialization/cloning), a new TCP::raw_options BiF for accessing raw TCP option data with tests/docs, and an extended file hash analyzer to include SHA224/384/512. Critical bug fixes addressed initialization stability for SHA384 across environments and UBSAN-related handling for empty TCP option data, improving reliability in CI and production deployments. These contributions increase security tooling, data integrity checks, and network forensics capabilities, offering tangible business value and cross-platform consistency.
October 2025
August 2025
2 Commits • 2 Features
Aug 1, 2025August 2025 monthly summary for zeek/zeek focusing on observability improvements and CI/CD modernization. Delivered Protocol-aware Analyzer Logging by adding a new 'proto' field to analyzer.log to distinguish TCP vs UDP connections; updated the logging framework to capture and record transport protocol for each connection; baseline test logs updated to reflect the new field. This enhances traffic classification, debugging, and incident investigation. Modernized CI/CD infrastructure by upgrading the base OS to Ubuntu 25.04 and updating Dockerfile and Cirrus CI configurations, replacing the deprecated Ubuntu 24.10 base image. This reduces security risk, improves build reliability, and ensures ongoing compatibility with current tooling.
August 2025
2 Commits • 2 Features
Aug 1, 2025August 2025 monthly summary for zeek/zeek focusing on observability improvements and CI/CD modernization. Delivered Protocol-aware Analyzer Logging by adding a new 'proto' field to analyzer.log to distinguish TCP vs UDP connections; updated the logging framework to capture and record transport protocol for each connection; baseline test logs updated to reflect the new field. This enhances traffic classification, debugging, and incident investigation. Modernized CI/CD infrastructure by upgrading the base OS to Ubuntu 25.04 and updating Dockerfile and Cirrus CI configurations, replacing the deprecated Ubuntu 24.10 base image. This reduces security risk, improves build reliability, and ensures ongoing compatibility with current tooling.
July 2025
10 Commits • 4 Features
Jul 1, 2025July 2025 performance summary for zeek/zeek. Delivered end-to-end feature work and reliability improvements that enhance traffic analysis fidelity, observability, and maintainability. The focus was on PPPoE parsing accuracy and session-id visibility, connection handling improvements, and test infrastructure alignment to support reliable, scalable deployments.
10 Commits • 4 Features
Jul 1, 2025July 2025 performance summary for zeek/zeek. Delivered end-to-end feature work and reliability improvements that enhance traffic analysis fidelity, observability, and maintainability. The focus was on PPPoE parsing accuracy and session-id visibility, connection handling improvements, and test infrastructure alignment to support reliable, scalable deployments.
July 2025
June 2025
12 Commits • 5 Features
Jun 1, 2025June 2025: Delivered five major features/improvements across zeek/zeek to enhance reliability, observability, and performance. Key outcomes include unified analyzer logging and failure reporting, robustness and test stability enhancements for the Spicy SSL Analyzer, standardized timestamp handling for certificates, consolidation of the protocol detection framework, and a significant improvement to testing efficiency through parallelized test execution. These changes improve debugging fidelity, accuracy of analytics, protocol detection accuracy, and CI turnaround.
June 2025
12 Commits • 5 Features
Jun 1, 2025June 2025: Delivered five major features/improvements across zeek/zeek to enhance reliability, observability, and performance. Key outcomes include unified analyzer logging and failure reporting, robustness and test stability enhancements for the Spicy SSL Analyzer, standardized timestamp handling for certificates, consolidation of the protocol detection framework, and a significant improvement to testing efficiency through parallelized test execution. These changes improve debugging fidelity, accuracy of analytics, protocol detection accuracy, and CI turnaround.
May 2025
3 Commits • 2 Features
May 1, 2025May 2025: Three focused updates in zeek/zeek delivering reliability, security, and observability improvements. Fixed robustness of the failed-service-logging.zeek script to operate regardless of a specific configuration option and added a regression test; added explicit TLS support for FTP (AUTH TLS) with TLS-state management and secure stream forwarding; standardized analyzer log naming from analyzer-failed.log to analyzer.log across the codebase with updated tests and baselines. These changes reduce operational risk, improve data integrity, and streamline debugging and monitoring. Demonstrates strong Zeek scripting, TLS integration, test automation, and maintainability improvements, delivering measurable business value in reliability, security, and observability.
3 Commits • 2 Features
May 1, 2025May 2025: Three focused updates in zeek/zeek delivering reliability, security, and observability improvements. Fixed robustness of the failed-service-logging.zeek script to operate regardless of a specific configuration option and added a regression test; added explicit TLS support for FTP (AUTH TLS) with TLS-state management and secure stream forwarding; standardized analyzer log naming from analyzer-failed.log to analyzer.log across the codebase with updated tests and baselines. These changes reduce operational risk, improve data integrity, and streamline debugging and monitoring. Demonstrates strong Zeek scripting, TLS integration, test automation, and maintainability improvements, delivering measurable business value in reliability, security, and observability.
May 2025
April 2025
5 Commits • 2 Features
Apr 1, 2025April 2025: Delivered reliability and observability improvements for zeek/zeek, with focused work on build stability, enhanced failure logging, and external testing reliability. The changes align with business goals of stable releases, faster debugging, and robust testing.
April 2025
5 Commits • 2 Features
Apr 1, 2025April 2025: Delivered reliability and observability improvements for zeek/zeek, with focused work on build stability, enhanced failure logging, and external testing reliability. The changes align with business goals of stable releases, faster debugging, and robust testing.
March 2025
8 Commits • 4 Features
Mar 1, 2025March 2025: Focused on improving observability, reliability, and contributor experience for Zeek. Delivered: (1) SSH Banner Handling Enhancements with client/server split, RFC-aligned parsing, and clearer event enqueuing; (2) Logging Refactor moving DPD/logging into policy-driven workflow and upgrading analyzer logging for diagnosability; (3) Protocol Violation Logging Fix to preserve failed analyzers in the service field with traceability; (4) Testing Framework enhancements for protocol mismatch detection; (5) Documentation and Community Guidelines to facilitate contribution and code of conduct.
8 Commits • 4 Features
Mar 1, 2025March 2025: Focused on improving observability, reliability, and contributor experience for Zeek. Delivered: (1) SSH Banner Handling Enhancements with client/server split, RFC-aligned parsing, and clearer event enqueuing; (2) Logging Refactor moving DPD/logging into policy-driven workflow and upgrading analyzer logging for diagnosability; (3) Protocol Violation Logging Fix to preserve failed analyzers in the service field with traceability; (4) Testing Framework enhancements for protocol mismatch detection; (5) Documentation and Community Guidelines to facilitate contribution and code of conduct.
March 2025
February 2025
9 Commits • 3 Features
Feb 1, 2025February 2025 summary for zeek/zeek focusing on business value, reliability, and maintainability. Delivered key features and bug fixes across the repository to improve determinism, network name detection, policy alignment, and developer productivity. The work enhances test repeatability, detection accuracy, logging consistency, and baseline hygiene, setting the stage for more robust operational deployments.
February 2025
9 Commits • 3 Features
Feb 1, 2025February 2025 summary for zeek/zeek focusing on business value, reliability, and maintainability. Delivered key features and bug fixes across the repository to improve determinism, network name detection, policy alignment, and developer productivity. The work enhances test repeatability, detection accuracy, logging consistency, and baseline hygiene, setting the stage for more robust operational deployments.
January 2025
12 Commits • 5 Features
Jan 1, 2025January 2025 (2025-01) monthly summary for zeek/zeek. Key work delivered across TLS protocol constants, DNS event handling, DPD logging, IRC analyzer validation, and connection log structure, emphasizing business value, security, and observability. Outcomes include improved interoperability with post-quantum TLS (ML-KEM, CECPQ2) and RFC-aligned constants, enhanced DNS event visibility and error messaging, streamlined DPD monitoring with explicit analyzer tracking and failed-services logging, robust IRC protocol validation to prevent erroneous connection confirmations, and a precisely ordered service field in conn.log for accurate protocol layering. These efforts reduce risk, improve diagnostics, and support reliable, scalable network monitoring in production.
12 Commits • 5 Features
Jan 1, 2025January 2025 (2025-01) monthly summary for zeek/zeek. Key work delivered across TLS protocol constants, DNS event handling, DPD logging, IRC analyzer validation, and connection log structure, emphasizing business value, security, and observability. Outcomes include improved interoperability with post-quantum TLS (ML-KEM, CECPQ2) and RFC-aligned constants, enhanced DNS event visibility and error messaging, streamlined DPD monitoring with explicit analyzer tracking and failed-services logging, robust IRC protocol validation to prevent erroneous connection confirmations, and a precisely ordered service field in conn.log for accurate protocol layering. These efforts reduce risk, improve diagnostics, and support reliable, scalable network monitoring in production.
January 2025
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for zeek/zeek: Delivered a controlled, opt-in experimental SSL analysis capability by introducing the Experimental Spicy SSL Analyzer. The feature is disabled by default and gated behind a configure-time option to protect production stability while enabling R&D into SSL/TLS visibility. A NEWS entry documenting the experimental analyzer was added to communicate the initiative to users and maintainers. The analyzer supports SSL/TLS (not DTLS) and is intended for experimentation. No major bugs fixed were recorded in the provided data. Overall impact: establishes a safe path to evaluate advanced SSL analytics, enabling improved security monitoring and data-driven improvements while maintaining production safety. Technologies/skills demonstrated include feature-flag design via configure-time options, release-note/documentation discipline, and traceable commit-based changes.
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for zeek/zeek: Delivered a controlled, opt-in experimental SSL analysis capability by introducing the Experimental Spicy SSL Analyzer. The feature is disabled by default and gated behind a configure-time option to protect production stability while enabling R&D into SSL/TLS visibility. A NEWS entry documenting the experimental analyzer was added to communicate the initiative to users and maintainers. The analyzer supports SSL/TLS (not DTLS) and is intended for experimentation. No major bugs fixed were recorded in the provided data. Overall impact: establishes a safe path to evaluate advanced SSL analytics, enabling improved security monitoring and data-driven improvements while maintaining production safety. Technologies/skills demonstrated include feature-flag design via configure-time options, release-note/documentation discipline, and traceable commit-based changes.
November 2024
8 Commits • 5 Features
Nov 1, 2024November 2024: Expanded CI coverage, modernized dependencies, and strengthened test infrastructure for zeek/zeek. Delivered cross-distro CI support with Ubuntu 24.10, restored compatibility on Fedora 41 via crypto policy adjustments, refreshed dependencies (SQLite and 3rdparty), enhanced SQLite log writer configurability, and improved test infrastructure documentation and reliability. These changes reduce release risk, broaden deployment environments, and improve data integrity and observability.
8 Commits • 5 Features
Nov 1, 2024November 2024: Expanded CI coverage, modernized dependencies, and strengthened test infrastructure for zeek/zeek. Delivered cross-distro CI support with Ubuntu 24.10, restored compatibility on Fedora 41 via crypto policy adjustments, refreshed dependencies (SQLite and 3rdparty), enhanced SQLite log writer configurability, and improved test infrastructure documentation and reliability. These changes reduce release risk, broaden deployment environments, and improve data integrity and observability.
November 2024
October 2024
1 Commits • 1 Features
Oct 1, 2024October 2024: Completed key feature delivery for Zeek test coverage on TCP over 802.3/SNAP, strengthening protocol validation and regression protection. No major bug fixes reported this month. The work improves test suite completeness and reliability, enabling earlier detection of protocol handling issues and contributing to higher code quality and customer confidence.
October 2024
1 Commits • 1 Features
Oct 1, 2024October 2024: Completed key feature delivery for Zeek test coverage on TCP over 802.3/SNAP, strengthening protocol validation and regression protection. No major bug fixes reported this month. The work improves test suite completeness and reliability, enabling earlier detection of protocol handling issues and contributing to higher code quality and customer confidence.
May 2023
1 Commits • 1 Features
May 1, 2023In May 2023, the zeek/zeek repository delivered a major upgrade to the SQLite library, updating to version 3.41.2. The change introduces performance enhancements, including improved locking mechanisms and new features that enhance overall database performance and functionality. The update is tracked by commit dfd32b3b37276fbf34204f3666b2fdf445a438d0. No major bugs were reported in this period. This work improves query latency and throughput for database-backed operations, reduces maintenance drift by aligning with a current SQLite release, and strengthens overall stability under heavy workloads. Skills demonstrated include dependency management, 3rd-party integration, and performance-oriented code quality.
1 Commits • 1 Features
May 1, 2023In May 2023, the zeek/zeek repository delivered a major upgrade to the SQLite library, updating to version 3.41.2. The change introduces performance enhancements, including improved locking mechanisms and new features that enhance overall database performance and functionality. The update is tracked by commit dfd32b3b37276fbf34204f3666b2fdf445a438d0. No major bugs were reported in this period. This work improves query latency and throughput for database-backed operations, reduces maintenance drift by aligning with a current SQLite release, and strengthens overall stability under heavy workloads. Skills demonstrated include dependency management, 3rd-party integration, and performance-oriented code quality.
May 2023
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Quality Metrics
Correctness92.4%
Maintainability90.8%
Architecture89.8%
Performance84.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
BashBifCC++CMakeDockerfileGitPacPythonShell
Technical Skills
API integrationBug FixingBuild AutomationBuild System ConfigurationBuild System IntegrationBuild SystemsC programmingC++C++ DevelopmentC++ developmentCI/CDCertificate ParsingCode AnalysisCode RefactoringCodebase Maintenance
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline