/usr/share/gocode/src/github.com/hashicorp/serf/cmd/serf/command/keygen.go is in golang-github-hashicorp-serf-dev 0.8.1+git20171021.c20a0b1~ds1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"crypto/rand"
"encoding/base64"
"fmt"
"github.com/mitchellh/cli"
"strings"
)
// KeygenCommand is a Command implementation that generates an encryption
// key for use in `serf agent`.
type KeygenCommand struct {
Ui cli.Ui
}
func (c *KeygenCommand) Run(_ []string) int {
key := make([]byte, 16)
n, err := rand.Reader.Read(key)
if err != nil {
c.Ui.Error(fmt.Sprintf("Error reading random data: %s", err))
return 1
}
if n != 16 {
c.Ui.Error(fmt.Sprintf("Couldn't read enough entropy. Generate more entropy!"))
return 1
}
c.Ui.Output(base64.StdEncoding.EncodeToString(key))
return 0
}
func (c *KeygenCommand) Synopsis() string {
return "Generates a new encryption key"
}
func (c *KeygenCommand) Help() string {
helpText := `
Usage: serf keygen
Generates a new encryption key that can be used to configure the
agent to encrypt traffic. The output of this command is already
in the proper format that the agent expects.
`
return strings.TrimSpace(helpText)
}
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