Log IP addresses of connecting devices per key to protect against abuse

[sobhan-m94]

Some of my users dos/ddos externals servers through VPN. and the datacenter sends me a abuse email.
How can I find access key id by IP ? is there logs about this ?
I would like to log the IP addresses of connecting devices per key. any solution ?

For example :

Time	Key ID	IP
2023/04/30 10:13:16	3	144.8.252.162
2023/04/30 11:34:56	3	45.19.146.148
2023/04/30 14:54:06	2	220.126.224.116
2023/04/30 21:04:25	10	63.235.39.34

[sobhan-m94]

@fortuna

[vimagick]

https://github.com/Jigsaw-Code/outline-ss-server/blob/v1.7.0/service/tcp.go#L90

You can put cipherEntry.ID and netip.Addr into INFO log.

func findAccessKey(...) {
...
	slog.LogAttrs(nil, slog.LevelInfo, "TCP: Found client.", slog.String("ID", entry.ID), slog.String("IP", clientIP.String()))
...
}

$ docker run --rm -it -v $PWD:/tmp golang:1.21
>>> go install github.com/Jigsaw-Code/outline-ss-server/cmd/outline-ss-server@v1.7.0
>>> cd /go/pkg/mod/github.com/\!jigsaw-\!code/outline-ss-server@v1.7.0/cmd/outline-ss-server
>>> sed -i '90s@^@\tslog.LogAttrs(nil, slog.LevelInfo, "TCP: Found client.", slog.String("ID", entry.ID), slog.String("IP", clientIP.String()))@' ../../service/tcp.go
>>> CGO_ENABLED=0 go build -ldflags="-X 'main.version=1.7.0-dev'" -o outline-ss-server
>>> strip outline-ss-server
>>> ./outline-ss-server -version
>>> mv outline-ss-server /tmp
>>> exit
$ ./outline-ss-server -version

outline-ss-server_1.7.0-dev_linux_x86_64.gz