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Git：ProxyCommand + NCATでSOCKS5プロキシを押すと失敗する

sOCKS5プロキシは次のように実行されます

ss-local ... -l 1080 ...
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w/proxychainsを押すと

$ proxychains git Push
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[proxychains] config file found: /etc/proxychains.conf
[proxychains] preloading /usr/lib/libproxychains4.so
[proxychains] DLL init: proxychains-ng 4.14
[proxychains] DLL init: proxychains-ng 4.14
[proxychains] Strict chain  ...  127.0.0.1:1080  ...  github.com:22  ...  OK
Warning: the RSA Host key for 'github.com' differs from the key for the IP address '224.0.0.1'
Offending key for IP in /home/darren/.ssh/known_hosts:40
Matching Host key in /home/darren/.ssh/known_hosts:2
Everything up-to-date
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w/proxyCommand + NCATが失敗する

$ env GIT_SSH_COMMAND="ssh -vvv -o ProxyCommand='ncat -vvvv --proxy-type socks5 --proxy 127.0.0.1:1080 %h %p'" /usr/bin/git Push
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OpenSSH_8.4p1, OpenSSL 1.1.1i  8 Dec 2020
debug1: Reading configuration data /home/darren/.ssh/config
debug1: /home/darren/.ssh/config line 4: Applying options for github.com
debug1: Reading configuration data /etc/ssh/ssh_config
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/home/darren/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/home/darren/.ssh/known_hosts2'
debug1: Executing proxy command: exec ncat -vvvv --proxy-type socks5 --proxy 127.0.0.1:1080 github.com 22
debug1: identity file /home/darren/.ssh/id_rsa type 0
debug1: identity file /home/darren/.ssh/id_rsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.4
Ncat: Version 7.91 ( https://nmap.org/ncat )
libnsock nsock_set_loglevel(): Set log level to DEBUG
NCAT DEBUG: Using system default trusted CA certificates and those in /usr/share/ncat/ca-bundle.crt.
Ncat: Connected to proxy 127.0.0.1:1080
Ncat: No authentication needed.
Ncat: Host github.com will be resolved by the proxy.
Ncat: connection succeeded.
libnsock nsock_iod_new2(): nsock_iod_new (IOD #1)
libnsock nsock_iod_new2(): nsock_iod_new (IOD #2)
libnsock nsock_loop(): nsock_loop() started (no timeout). 0 events pending
Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.
libnsock nsock_iod_delete(): nsock_iod_delete (IOD #1)
libnsock nsock_iod_delete(): nsock_iod_delete (IOD #2)
kex_exchange_identification: Connection closed by remote Host
Connection closed by UNKNOWN port 65535
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
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情報

$ uname -r
5.10.4-Arch2-1
$ pacman -Qii proxychains-ng | grep Version
Version         : 4.14-2
$ git --version
git version 2.30.0
$ ssh -V
OpenSSH_8.4p1, OpenSSL 1.1.1i  8 Dec 2020
$ ncat --version
Ncat: Version 7.91 ( https://nmap.org/ncat )
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〜/ .ssh/config

...
Host github.com
  User git
  IdentityFile ~/.ssh/id_rsa
  StrictHostKeyChecking no
...
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/etc/proxychains.conf.

strict_chain
proxy_dns 
remote_dns_subnet 224
tcp_read_time_out 15000
tcp_connect_time_out 8000
[ProxyList]
socks5 127.0.0.1 1080
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sshgitsocks-proxysocks5
2
Darren Ng

コメントで言ったように、それはncatのバグです。それはmasterで固定されていますが、現在のバージョンのMacOSのHomeBrewにまだ古いバージョンが含まれています。

私のコンパイルmasterから NMAP Repo （そして生成されたバイナリを使用）問題を修正しました。

[〜＃〜] UPD [〜＃〜]。 Nmap（およびNCAT）HomeBrewで7.92に更新されたばかりで、うまく機能し、コンパイルする必要はもうありません。

❯ ncat --version
Ncat: Version 7.92 ( https://nmap.org/ncat )
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1
artem