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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, false,
"prepare the SSH connection only, but do not execute SSH (useful for using breakglass within an SSH ProxyCommand)") "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( sshConfig = flag.String(
"ssh_config", "ssh_config",
"", "",
@ -244,6 +249,17 @@ func breakglass() error {
return err 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 { if *prepare {
return nil return nil
} }