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init.go
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init.go
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package ca
import (
"crypto/rand"
"fmt"
"io"
"strings"
"github.com/smallstep/cli/command"
"github.com/smallstep/cli/crypto/pemutil"
"github.com/smallstep/cli/crypto/pki"
"github.com/smallstep/cli/errs"
stepx509 "github.com/smallstep/cli/pkg/x509"
"github.com/smallstep/cli/ui"
"github.com/smallstep/cli/utils"
"github.com/urfave/cli"
)
func initCommand() cli.Command {
return cli.Command{
Name: "init",
Action: cli.ActionFunc(initAction),
Usage: "initialize the CA PKI",
UsageText: `**step ca init**
[**--root**=<file>] [**--key**=<file>] [**--pki**]`,
Description: `**step ca init** command initializes a public key infrastructure (PKI) to be
used by the Certificate Authority`,
Flags: []cli.Flag{
cli.StringFlag{
Name: "root",
Usage: "The path of an existing PEM <file> to be used as the root certificate authority.",
EnvVar: command.IgnoreEnvVar,
},
cli.StringFlag{
Name: "key",
Usage: "The path of an existing key <file> of the root certificate authority.",
EnvVar: command.IgnoreEnvVar,
},
cli.BoolFlag{
Name: "pki",
Usage: "Generate only the PKI without the CA configuration.",
},
cli.StringFlag{
Name: "name",
Usage: "The <name> of the new PKI.",
},
cli.StringFlag{
Name: "dns",
Usage: "The comma sepparated DNS <names> or IP addresses of the new CA.",
},
cli.StringFlag{
Name: "address",
Usage: "The <address> that the new CA will listen at.",
},
cli.StringFlag{
Name: "provisioner",
Usage: "The <name> of the first provisioner.",
},
cli.StringFlag{
Name: "password-file",
Usage: `The path to the <file> containing the password to encrypt the keys.`,
},
cli.StringFlag{
Name: "provisioner-password-file",
Usage: `The path to the <file> containing the password to encrypt the provisioner key.`,
},
cli.StringFlag{
Name: "with-ca-url",
Usage: `<URI> of the Step Certificate Authority to write in defaults.json`,
},
},
}
}
func initAction(ctx *cli.Context) (err error) {
if err := assertCryptoRand(); err != nil {
return err
}
var rootCrt *stepx509.Certificate
var rootKey interface{}
root := ctx.String("root")
key := ctx.String("key")
configure := !ctx.Bool("pki")
caURL := ctx.String("with-ca-url")
switch {
case len(root) > 0 && len(key) == 0:
return errs.RequiredWithFlag(ctx, "root", "key")
case len(root) == 0 && len(key) > 0:
return errs.RequiredWithFlag(ctx, "key", "root")
case len(root) > 0 && len(key) > 0:
var err error
if rootCrt, err = pemutil.ReadStepCertificate(root); err != nil {
return err
}
if rootKey, err = pemutil.Read(key); err != nil {
return err
}
}
var password string
if passwordFile := ctx.String("password-file"); passwordFile != "" {
password, err = utils.ReadStringPasswordFromFile(passwordFile)
if err != nil {
return err
}
}
// Provisioner password will be equal to the certificate private keys if
// --provisioner-password-file is not provided.
var provisionerPassword []byte
if passwordFile := ctx.String("provisioner-password-file"); passwordFile != "" {
provisionerPassword, err = utils.ReadPasswordFromFile(passwordFile)
if err != nil {
return err
}
}
p, err := pki.New(pki.GetPublicPath(), pki.GetSecretsPath(), pki.GetConfigPath())
if err != nil {
return err
}
name, err := ui.Prompt("What would you like to name your new PKI? (e.g. Smallstep)",
ui.WithValidateNotEmpty(), ui.WithValue(ctx.String("name")))
if err != nil {
return err
}
if configure {
names, err := ui.Prompt("What DNS names or IP addresses would you like to add to your new CA? (e.g. ca.smallstep.com[,1.1.1.1,etc.])",
ui.WithValidateFunc(ui.DNS()), ui.WithValue(ctx.String("dns")))
if err != nil {
return err
}
names = strings.Replace(names, " ", ",", -1)
parts := strings.Split(names, ",")
var dnsNames []string
for _, name := range parts {
if len(name) == 0 {
continue
}
dnsNames = append(dnsNames, strings.TrimSpace(name))
}
address, err := ui.Prompt("What address will your new CA listen at? (e.g. :443)",
ui.WithValidateFunc(ui.Address()), ui.WithValue(ctx.String("address")))
if err != nil {
return err
}
provisioner, err := ui.Prompt("What would you like to name the first provisioner for your new CA? (e.g. you@smallstep.com)",
ui.WithValidateNotEmpty(), ui.WithValue(ctx.String("provisioner")))
if err != nil {
return err
}
p.SetProvisioner(provisioner)
p.SetAddress(address)
p.SetDNSNames(dnsNames)
p.SetCAURL(caURL)
}
pass, err := ui.PromptPasswordGenerate("What do you want your password to be? [leave empty and we'll generate one]",
ui.WithRichPrompt(), ui.WithValue(password))
if err != nil {
return err
}
if configure {
// Generate provisioner key pairs.
if len(provisionerPassword) > 0 {
if err := p.GenerateKeyPairs(provisionerPassword); err != nil {
return err
}
} else {
if err := p.GenerateKeyPairs(pass); err != nil {
return err
}
}
}
// Generate root certificate if not set.
if rootCrt == nil && rootKey == nil {
fmt.Println()
fmt.Print("Generating root certificate... \n")
rootCrt, rootKey, err = p.GenerateRootCertificate(name+" Root CA", pass)
if err != nil {
return err
}
fmt.Println("all done!")
} else {
fmt.Println()
fmt.Print("Copying root certificate... \n")
if err := p.WriteRootCertificate(rootCrt, rootKey, pass); err != nil {
return err
}
fmt.Println("all done!")
}
fmt.Println()
fmt.Print("Generating intermediate certificate... \n")
err = p.GenerateIntermediateCertificate(name+" Intermediate CA", rootCrt, rootKey, pass)
if err != nil {
return err
}
fmt.Println("all done!")
if !configure {
p.TellPKI()
return nil
}
return p.Save()
}
// assertCrytoRand asserts that a cryptographically secure random number
// generator is available, it will return an error otherwise.
func assertCryptoRand() error {
buf := make([]byte, 64)
_, err := io.ReadFull(rand.Reader, buf)
if err != nil {
return errs.NewError("crypto/rand is unavailable: Read() failed with %#v", err)
}
return nil
}