package create import ( "flag" "fmt" "os" "github.com/hashicorp/consul/command/flags" "github.com/hashicorp/consul/command/tls" "github.com/hashicorp/consul/tlsutil" "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 := tlsutil.GenerateSerialNumber() if err != nil { c.UI.Error(err.Error()) return 1 } s, pk, err := tlsutil.GeneratePrivateKey() if err != nil { c.UI.Error(err.Error()) } constraints := []string{} if c.constraint { constraints = append(c.additionalConstraints, []string{c.domain, "localhost"}...) } ca, err := tlsutil.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 `