open-consul/command/tls/ca/create/tls_ca_create.go

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package create
import (
"flag"
"fmt"
"os"
"github.com/hashicorp/consul/command/flags"
"github.com/hashicorp/consul/command/tls"
"github.com/mitchellh/cli"
)
func New(ui cli.Ui) *cmd {
c := &cmd{UI: ui}
c.init()
return c
}
type cmd struct {
UI cli.Ui
flags *flag.FlagSet
help string
days int
domain string
constraint bool
additionalConstraints flags.AppendSliceValue
}
func (c *cmd) init() {
c.flags = flag.NewFlagSet("", flag.ContinueOnError)
// TODO: perhaps add a -years arg to better capture user intent given that leap years are a thing
c.flags.IntVar(&c.days, "days", 1825, "Provide number of days the CA is valid for from now on. Defaults to 5 years.")
c.flags.BoolVar(&c.constraint, "name-constraint", false, "Add name constraints for the CA. Results in rejecting "+
"certificates for other DNS than specified. If turned on localhost and -domain will be added to the allowed "+
"DNS. If the UI is going to be served over HTTPS its DNS has to be added with -additional-constraint. It is not "+
"possible to add that after the fact! Defaults to false.")
c.flags.StringVar(&c.domain, "domain", "consul", "Domain of consul cluster. Only used in combination with -name-constraint. Defaults to consul.")
c.flags.Var(&c.additionalConstraints, "additional-name-constraint", "Add name constraints for the CA. Results in rejecting certificates "+
"for other DNS than specified. Can be used multiple times. Only used in combination with -name-constraint.")
c.help = flags.Usage(help, c.flags)
}
func (c *cmd) Run(args []string) int {
if err := c.flags.Parse(args); err != nil {
if err == flag.ErrHelp {
return 0
}
c.UI.Error(fmt.Sprintf("Failed to parse args: %v", err))
return 1
}
certFileName := fmt.Sprintf("%s-agent-ca.pem", c.domain)
pkFileName := fmt.Sprintf("%s-agent-ca-key.pem", c.domain)
if !(tls.FileDoesNotExist(certFileName)) {
c.UI.Error(certFileName + " already exists.")
return 1
}
if !(tls.FileDoesNotExist(pkFileName)) {
c.UI.Error(pkFileName + " already exists.")
return 1
}
sn, err := tls.GenerateSerialNumber()
if err != nil {
c.UI.Error(err.Error())
return 1
}
s, pk, err := tls.GeneratePrivateKey()
if err != nil {
c.UI.Error(err.Error())
}
constraints := []string{}
if c.constraint {
constraints = append(c.additionalConstraints, []string{c.domain, "localhost"}...)
}
ca, err := tls.GenerateCA(s, sn, c.days, constraints)
if err != nil {
c.UI.Error(err.Error())
}
caFile, err := os.Create(certFileName)
if err != nil {
c.UI.Error(err.Error())
}
caFile.WriteString(ca)
c.UI.Output("==> Saved " + certFileName)
pkFile, err := os.Create(pkFileName)
if err != nil {
c.UI.Error(err.Error())
}
pkFile.WriteString(pk)
c.UI.Output("==> Saved " + pkFileName)
return 0
}
func (c *cmd) Synopsis() string {
return synopsis
}
func (c *cmd) Help() string {
return c.help
}
const synopsis = "Create a new consul CA"
const help = `
Usage: consul tls ca create [options]
Create a new consul CA:
$ consul tls ca create
==> saved consul-agent-ca.pem
==> saved consul-agent-ca-key.pem
`