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Socks5 Proxy with Go Lang. support USER_ID/PASSWORD. able to bypass HTTPS(SNI) censorship

License: MIT License

Go 99.44% Dockerfile 0.56%
socks socks5-proxy golang proxy proxy-server authentication anti-censorship

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ralfyang kokizzu zzsoszz lukebeer xstpl appkoders fengj6 phuong39 boythx briteming ooolledj

socks5-proxy's Issues

Web browser is not promting for login and password

Hi there! I've been trying to set up proxy server using your code. I removed srv.AuthNoAuthenticationRequiredCallback (comment out) so proxy works only with provided login and password. I tested it with APT and it successfully updated packages:

Prompt from main.go after calling apt update:

...
2023/08/06 15:20:49 user10 connecting to ru.archive.ubuntu.com:80
2023/08/06 15:20:49 Alowed host: ru.archive.ubuntu.com:80
2023/08/06 15:20:50 User Connected: 'user10'
2023/08/06 15:20:50 user10 connecting to esm.ubuntu.com:443
2023/08/06 15:20:50 Alowed host: esm.ubuntu.com:443  
2023/08/06 15:20:54 Goodbye user10!
...

And i see terminal output, which means that proxy authentication worked perfectly, i got update:

# apt update
Hit:1 http://ru.archive.ubuntu.com/ubuntu jammy InRelease
Get:2 http://ru.archive.ubuntu.com/ubuntu jammy-updates InRelease [119 kB]
...

79 packages can be upgraded. Run 'apt list --upgradable' to see them.

But there is an issue with configuring proxy for Firefox, it does not prompt to enter login and password

2023/08/06 15:33:53 socks5: Conn.serve: Handshake failed: authentication failed
2023/08/06 15:33:54 socks5: Conn.serve: Handshake failed: authentication failed

image
image

Do you have any suggestions what is wrong and how to fix it?

SNI Censorship Bypass Breaks Simple ASCII-based Communication Protocols

The current SNI censorship bypass for non-TSL HTTP relies on checking if the first byte received is an alphabet ASCII character(server.go#L266), however this breaks the connection handling if the message is in simple ASCII and it isn't HTTP.

How to replicate:
Simply send a packet containing a simple ASCII string through the SOCKS proxy.

Example:
nc -klvp 8080
And in another terminal:
echo "Test" | proxychains nc -v 127.0.0.1 8080

This results in an slice bounds out of range error

2021/09/23 11:23:20 IP OK: '127.0.0.1'
2021/09/23 11:23:20 Alowed host: 127.0.0.1:8080
2021/09/23 11:23:20 Write: 1
2021/09/23 11:23:20 Plain HTTP
2021/09/23 11:23:20 > READ 3
2021/09/23 11:23:20 socks5: panic serving 127.0.0.1:19100: runtime error: slice bounds out of range [:-1]
goroutine 21174 [running]:
_/home/Iorpim/SOCKS5/socks5.(*Conn).serve.func1(0xc0005b6780)
        /home/Iorpim/SOCKS5/socks5/server.go:335 +0xcf
panic(0x57a6a0, 0xc0000165a0)
        /usr/lib/go-1.15/src/runtime/panic.go:969 +0x175
_/home/Iorpim/SOCKS5/socks5.(*Conn).commandConnect(0xc0005b6780, 0xc000694000, 0x0, 0x0)
        /home/Iorpim/SOCKS5/socks5/server.go:278 +0x16b2
_/home/Iorpim/SOCKS5/socks5.(*Conn).command(0xc0005b6780, 0x0, 0x0)
        /home/Iorpim/SOCKS5/socks5/server.go:324 +0x192
_/home/Iorpim/SOCKS5/socks5.(*Conn).serve(0xc0005b6780)
        /home/Iorpim/SOCKS5/socks5/server.go:346 +0xf0
created by _/home/Iorpim/SOCKS5/socks5.(*Server).ListenAndServe
        /home/Iorpim/SOCKS5/socks5/server.go:86 +0x2f8

Improving protocol detection, or simply assuming it isn't HTTP if an error is received during the detection segment, should fix it.

Initial Update

Hi 👊

This is my first visit to this fine repo, but it seems you have been working hard to keep all dependencies updated so far.

Once you have closed this issue, I'll create separate pull requests for every update as soon as I find one.

That's it for now!

Happy merging! 🤖

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