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breakglass command: add -proxy flag for easier ProxyCommand usage

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Now you can use the following in your ~/.ssh/config for example:

Host scan2drive-backup
	Hostname scan2drive.lan
	IdentityFile ~/.ssh/id_ed25519_scan2drivebackup
	ProxyCommand breakglass -proxy scan2drive.lan
This commit is contained in:
Michael Stapelberg 2022-03-31 19:52:53 +02:00
parent 087335e682
commit 629a19f92d
1 changed files with 16 additions and 0 deletions
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16
cmd/breakglass/breakglass.go
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@ -186,6 +186,11 @@ func breakglass() error {
false,
"prepare the SSH connection only, but do not execute SSH (useful for using breakglass within an SSH ProxyCommand)")
proxy = flag.Bool(
"proxy",
false,
"prepare the SSH connection, then connect stdin/stdout to the SSH port (useful for using breakglass within an SSH ProxyCommand)")
sshConfig = flag.String(
"ssh_config",
"",
@ -244,6 +249,17 @@ func breakglass() error {
return err
}
if *proxy {
log.Printf("proxying SSH traffic (-proxy flag)")
nc := exec.Command("nc", hostname, "22")
nc.Stdout = os.Stdout
nc.Stdin = os.Stdin
if err := nc.Run(); err != nil {
return fmt.Errorf("%v: %v", nc.Args, err)
}
return nil
}
if *prepare {
return nil
}