Case study

NJUConnect: reconstructing the NJU EasyConnect VPN client

NJUConnect implements a Go client for Nanjing University's EasyConnect VPN service using a custom TLS ClientHello and separate tunnel receive and transmit handshakes. Its code handles web login, token exchange, IP assignment and a SOCKS5 endpoint backed by gVisor networking.

Targets: Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06

Stars: 624
Last commit: 2025-09-30
Language: Go
Status: Archived

GitHub data as of 2026-11-09

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Requirements & limits

Prerequisites: Requires access credentials for Nanjing University's VPN service.
Limits: The client is no longer maintained and does not work with updated EasyConnect servers; it still works with Nanjing University's server.
License: The author withdrew the AGPL-3.0 license; the repository has no license file.

Cite

BibTeX

@misc{njuconnect-vpn-protocol-case,
  title = {{NJUConnect: reconstructing the NJU EasyConnect VPN client}},
  howpublished = {\url{https://github.com/lyc8503/NJUConnect}},
  url = {https://github.com/lyc8503/NJUConnect},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/njuconnect-vpn-protocol-case/}}
}

Plain text

NJUConnect: reconstructing the NJU EasyConnect VPN client. https://github.com/lyc8503/NJUConnect (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/njuconnect-vpn-protocol-case/

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About this entry

The description was reviewed against primary sources.

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Primary sources

core/protocol.go GitHub · lyc8503/NJUConnect · Revision ded56b0
README.md GitHub · lyc8503/NJUConnect · Revision ded56b0
core/EasyConnectClient.go GitHub · lyc8503/NJUConnect · Revision ded56b0