forked from TrueCloudLab/certificates
Add initialization script for an AWS KMS.
This commit is contained in:
Mariano Cano
parent
c32abb76cd
commit
5b680b2349
2 changed files with 243 additions and 1 deletions
8
Makefile
8
Makefile
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@ -2,6 +2,8 @@ PKG?=github.com/smallstep/certificates/cmd/step-ca
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BINNAME?=step-ca
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CLOUDKMS_BINNAME?=step-cloudkms-init
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CLOUDKMS_PKG?=github.com/smallstep/certificates/cmd/step-cloudkms-init
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AWSKMS_BINNAME?=step-awskms-init
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AWSKMS_PKG?=github.com/smallstep/certificates/cmd/step-awskms-init
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YUBIKEY_BINNAME?=step-yubikey-init
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YUBIKEY_PKG?=github.com/smallstep/certificates/cmd/step-yubikey-init
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@ -66,7 +68,7 @@ GOFLAGS := CGO_ENABLED=0
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download:
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$Q go mod download
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build: $(PREFIX)bin/$(BINNAME) $(PREFIX)bin/$(CLOUDKMS_BINNAME) $(PREFIX)bin/$(YUBIKEY_BINNAME)
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build: $(PREFIX)bin/$(BINNAME) $(PREFIX)bin/$(CLOUDKMS_BINNAME) $(PREFIX)bin/$(AWSKMS_BINNAME) $(PREFIX)bin/$(YUBIKEY_BINNAME)
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@echo "Build Complete!"
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$(PREFIX)bin/$(BINNAME): download $(call rwildcard,*.go)
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@ -77,6 +79,10 @@ $(PREFIX)bin/$(CLOUDKMS_BINNAME): download $(call rwildcard,*.go)
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$Q mkdir -p $(@D)
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$Q $(GOOS_OVERRIDE) $(GOFLAGS) go build -v -o $(PREFIX)bin/$(CLOUDKMS_BINNAME) $(LDFLAGS) $(CLOUDKMS_PKG)
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$(PREFIX)bin/$(AWSKMS_BINNAME): download $(call rwildcard,*.go)
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$Q mkdir -p $(@D)
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$Q $(GOOS_OVERRIDE) $(GOFLAGS) go build -v -o $(PREFIX)bin/$(AWSKMS_BINNAME) $(LDFLAGS) $(AWSKMS_PKG)
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$(PREFIX)bin/$(YUBIKEY_BINNAME): download $(call rwildcard,*.go)
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$Q mkdir -p $(@D)
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$Q $(GOOS_OVERRIDE) $(GOFLAGS) go build -v -o $(PREFIX)bin/$(YUBIKEY_BINNAME) $(LDFLAGS) $(YUBIKEY_PKG)
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236
cmd/step-awskms-init/main.go
Normal file
236
cmd/step-awskms-init/main.go
Normal file
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@ -0,0 +1,236 @@
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package main
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import (
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"context"
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"crypto"
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"crypto/rand"
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"crypto/sha1"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"flag"
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"fmt"
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"math/big"
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"os"
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"time"
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"github.com/smallstep/certificates/kms/apiv1"
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"github.com/smallstep/certificates/kms/awskms"
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"github.com/smallstep/cli/crypto/pemutil"
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"github.com/smallstep/cli/ui"
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"github.com/smallstep/cli/utils"
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"golang.org/x/crypto/ssh"
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)
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func main() {
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var credentialsFile, region string
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var ssh bool
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flag.StringVar(&credentialsFile, "credentials-file", "", "Path to the `file` containing the AWS KMS credentials.")
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flag.StringVar(®ion, "region", "", "AWS KMS region name.")
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flag.BoolVar(&ssh, "ssh", false, "Create SSH keys.")
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flag.Usage = usage
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flag.Parse()
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c, err := awskms.New(context.Background(), apiv1.Options{
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Type: string(apiv1.AmazonKMS),
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Region: region,
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CredentialsFile: credentialsFile,
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})
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if err != nil {
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fatal(err)
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}
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if err := createPKI(c); err != nil {
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fatal(err)
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}
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if ssh {
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ui.Println()
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if err := createSSH(c); err != nil {
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fatal(err)
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}
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}
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}
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func fatal(err error) {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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func usage() {
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fmt.Fprintln(os.Stderr, "Usage: step-awskms-init --project <name>")
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fmt.Fprintln(os.Stderr, `
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The step-awskms-init command initializes a public key infrastructure (PKI)
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to be used by step-ca.
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This tool is experimental and in the future it will be integrated in step cli.
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OPTIONS`)
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fmt.Fprintln(os.Stderr)
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flag.PrintDefaults()
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fmt.Fprintln(os.Stderr, `
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COPYRIGHT
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(c) 2018-2020 Smallstep Labs, Inc.`)
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os.Exit(1)
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}
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func createPKI(c *awskms.KMS) error {
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ui.Println("Creating PKI ...")
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// Root Certificate
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resp, err := c.CreateKey(&apiv1.CreateKeyRequest{
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Name: "root",
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SignatureAlgorithm: apiv1.ECDSAWithSHA256,
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})
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if err != nil {
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return err
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}
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signer, err := c.CreateSigner(&resp.CreateSignerRequest)
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if err != nil {
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return err
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}
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now := time.Now()
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root := &x509.Certificate{
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IsCA: true,
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NotBefore: now,
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NotAfter: now.Add(time.Hour * 24 * 365 * 10),
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KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
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BasicConstraintsValid: true,
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MaxPathLen: 1,
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MaxPathLenZero: false,
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Issuer: pkix.Name{CommonName: "Smallstep Root"},
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Subject: pkix.Name{CommonName: "Smallstep Root"},
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SerialNumber: mustSerialNumber(),
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SubjectKeyId: mustSubjectKeyID(resp.PublicKey),
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AuthorityKeyId: mustSubjectKeyID(resp.PublicKey),
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}
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b, err := x509.CreateCertificate(rand.Reader, root, root, resp.PublicKey, signer)
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if err != nil {
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return err
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}
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if err = utils.WriteFile("root_ca.crt", pem.EncodeToMemory(&pem.Block{
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Type: "CERTIFICATE",
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Bytes: b,
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}), 0600); err != nil {
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return err
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}
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ui.PrintSelected("Root Key", resp.Name)
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ui.PrintSelected("Root Certificate", "root_ca.crt")
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root, err = pemutil.ReadCertificate("root_ca.crt")
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if err != nil {
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return err
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}
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// Intermediate Certificate
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resp, err = c.CreateKey(&apiv1.CreateKeyRequest{
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Name: "intermediate",
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SignatureAlgorithm: apiv1.ECDSAWithSHA256,
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})
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if err != nil {
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return err
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}
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intermediate := &x509.Certificate{
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IsCA: true,
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NotBefore: now,
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NotAfter: now.Add(time.Hour * 24 * 365 * 10),
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KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
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BasicConstraintsValid: true,
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MaxPathLen: 0,
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MaxPathLenZero: true,
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Issuer: root.Subject,
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Subject: pkix.Name{CommonName: "Smallstep Intermediate"},
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SerialNumber: mustSerialNumber(),
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SubjectKeyId: mustSubjectKeyID(resp.PublicKey),
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}
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b, err = x509.CreateCertificate(rand.Reader, intermediate, root, resp.PublicKey, signer)
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if err != nil {
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return err
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}
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if err = utils.WriteFile("intermediate_ca.crt", pem.EncodeToMemory(&pem.Block{
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Type: "CERTIFICATE",
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Bytes: b,
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}), 0600); err != nil {
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return err
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}
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ui.PrintSelected("Intermediate Key", resp.Name)
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ui.PrintSelected("Intermediate Certificate", "intermediate_ca.crt")
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return nil
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}
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func createSSH(c *awskms.KMS) error {
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ui.Println("Creating SSH Keys ...")
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// User Key
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resp, err := c.CreateKey(&apiv1.CreateKeyRequest{
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Name: "ssh-user-key",
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SignatureAlgorithm: apiv1.ECDSAWithSHA256,
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})
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if err != nil {
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return err
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}
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key, err := ssh.NewPublicKey(resp.PublicKey)
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if err != nil {
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return err
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}
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if err = utils.WriteFile("ssh_user_ca_key.pub", ssh.MarshalAuthorizedKey(key), 0600); err != nil {
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return err
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}
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ui.PrintSelected("SSH User Public Key", "ssh_user_ca_key.pub")
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ui.PrintSelected("SSH User Private Key", resp.Name)
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// Host Key
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resp, err = c.CreateKey(&apiv1.CreateKeyRequest{
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Name: "ssh-host-key",
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SignatureAlgorithm: apiv1.ECDSAWithSHA256,
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})
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if err != nil {
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return err
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}
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key, err = ssh.NewPublicKey(resp.PublicKey)
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if err != nil {
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return err
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}
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if err = utils.WriteFile("ssh_host_ca_key.pub", ssh.MarshalAuthorizedKey(key), 0600); err != nil {
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return err
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}
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ui.PrintSelected("SSH Host Public Key", "ssh_host_ca_key.pub")
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ui.PrintSelected("SSH Host Private Key", resp.Name)
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return nil
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}
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func mustSerialNumber() *big.Int {
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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sn, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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panic(err)
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}
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return sn
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}
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func mustSubjectKeyID(key crypto.PublicKey) []byte {
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b, err := x509.MarshalPKIXPublicKey(key)
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if err != nil {
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panic(err)
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}
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hash := sha1.Sum(b)
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return hash[:]
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}
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