FreeRADIUS/freeradius-server
Apr 2026 – Apr 2026
1 Month active
Languages Used
C
Technical Skills
C programmingRADIUS protocolTACACS+ protocolnetwork programming
Shang Chieh Tseng
PROFILE
Shang Chieh Tseng
Developed a Secure Packet Processing feature for the FreeRADIUS/freeradius-server repository, focusing on enhancing client lookup accuracy for authentication and decryption. Addressed a caching issue where broad subnet entries in per-thread client tries could overshadow more specific client definitions, potentially leading to authentication failures. The solution involved validating cached client entries against the global client list and ensuring that more specific matches would trigger a fresh lookup, discarding stale results. This approach improved the reliability of RADIUS authentication and TACACS+ decryption by ensuring correct shared secrets were always used. The work was implemented in C, leveraging network programming expertise.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
1Total
Bugs
0
Commits
1
Features
1
Lines of code
15
Activity Months1
Your Network
21 peopleShared Repositories
21
Work History
April 2026
1 Commits • 1 Features
Apr 1, 2026In April 2026, delivered a Secure Packet Processing feature with a robust client lookup enhancement for accurate client definitions, improving packet authentication (RADIUS) and TACACS+ decryption reliability. This work addressed a caching shadowing bug where a per-thread client trie could serve a broader subnet entry (e.g., /8) that shadows more specific definitions (e.g., /24). The fix ensures a fresh, correct client is used by validating cached entries against the global client list and discarding stale results when a more specific match exists. The change includes a per-thread lookup that falls back to the global list when necessary and caches the correct client for subsequent connections. Commit: 56fc72332b7ed070c7284283f6acbf883c91be7d.
1 Commits • 1 Features
Apr 1, 2026In April 2026, delivered a Secure Packet Processing feature with a robust client lookup enhancement for accurate client definitions, improving packet authentication (RADIUS) and TACACS+ decryption reliability. This work addressed a caching shadowing bug where a per-thread client trie could serve a broader subnet entry (e.g., /8) that shadows more specific definitions (e.g., /24). The fix ensures a fresh, correct client is used by validating cached entries against the global client list and discarding stale results when a more specific match exists. The change includes a per-thread lookup that falls back to the global list when necessary and caches the correct client for subsequent connections. Commit: 56fc72332b7ed070c7284283f6acbf883c91be7d.
April 2026
Activity
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Quality Metrics
Correctness100.0%
Maintainability80.0%
Architecture80.0%
Performance80.0%
AI Usage60.0%
Skills & Technologies
Programming Languages
C
Technical Skills
C programmingRADIUS protocolTACACS+ protocolnetwork programming
Repositories Contributed To
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