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Add ability to encrypt CA private key at rest (#386)

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Fixes #8.

`nebula-cert ca` now supports encrypting the CA's private key with a
passphrase. Pass `-encrypt` in order to be prompted for a passphrase.
Encryption is performed using AES-256-GCM and Argon2id for KDF. KDF
parameters default to RFC recommendations, but can be overridden via CLI
flags `-argon-memory`, `-argon-parallelism`, and `-argon-iterations`.
This commit is contained in:
John Maguire
2023-04-03 13:59:38 -04:00
committed by GitHub
parent ee8e1348e9
commit a56a97e5c3
16 changed files with 1037 additions and 69 deletions
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138
cmd/nebula-cert/sign_test.go
View File

@@ -6,6 +6,7 @@ package main
import (
"bytes"
"crypto/rand"
"errors"
"io/ioutil"
"os"
"testing"
@@ -58,17 +59,39 @@ func Test_signCert(t *testing.T) {
ob := &bytes.Buffer{}
eb := &bytes.Buffer{}
nopw := &StubPasswordReader{
password: []byte(""),
err: nil,
}
errpw := &StubPasswordReader{
password: []byte(""),
err: errors.New("stub error"),
}
passphrase := []byte("DO NOT USE THIS KEY")
testpw := &StubPasswordReader{
password: passphrase,
err: nil,
}
// required args
assertHelpError(t, signCert([]string{"-ca-crt", "./nope", "-ca-key", "./nope", "-ip", "1.1.1.1/24", "-out-key", "nope", "-out-crt", "nope"}, ob, eb), "-name is required")
assertHelpError(t, signCert(
[]string{"-ca-crt", "./nope", "-ca-key", "./nope", "-ip", "1.1.1.1/24", "-out-key", "nope", "-out-crt", "nope"}, ob, eb, nopw,
), "-name is required")
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
assertHelpError(t, signCert([]string{"-ca-crt", "./nope", "-ca-key", "./nope", "-name", "test", "-out-key", "nope", "-out-crt", "nope"}, ob, eb), "-ip is required")
assertHelpError(t, signCert(
[]string{"-ca-crt", "./nope", "-ca-key", "./nope", "-name", "test", "-out-key", "nope", "-out-crt", "nope"}, ob, eb, nopw,
), "-ip is required")
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
// cannot set -in-pub and -out-key
assertHelpError(t, signCert([]string{"-ca-crt", "./nope", "-ca-key", "./nope", "-name", "test", "-in-pub", "nope", "-ip", "1.1.1.1/24", "-out-crt", "nope", "-out-key", "nope"}, ob, eb), "cannot set both -in-pub and -out-key")
assertHelpError(t, signCert(
[]string{"-ca-crt", "./nope", "-ca-key", "./nope", "-name", "test", "-in-pub", "nope", "-ip", "1.1.1.1/24", "-out-crt", "nope", "-out-key", "nope"}, ob, eb, nopw,
), "cannot set both -in-pub and -out-key")
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
@@ -76,7 +99,7 @@ func Test_signCert(t *testing.T) {
ob.Reset()
eb.Reset()
args := []string{"-ca-crt", "./nope", "-ca-key", "./nope", "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", "nope", "-out-key", "nope", "-duration", "100m"}
assert.EqualError(t, signCert(args, ob, eb), "error while reading ca-key: open ./nope: "+NoSuchFileError)
assert.EqualError(t, signCert(args, ob, eb, nopw), "error while reading ca-key: open ./nope: "+NoSuchFileError)
// failed to unmarshal key
ob.Reset()
@@ -86,7 +109,7 @@ func Test_signCert(t *testing.T) {
defer os.Remove(caKeyF.Name())
args = []string{"-ca-crt", "./nope", "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", "nope", "-out-key", "nope", "-duration", "100m"}
assert.EqualError(t, signCert(args, ob, eb), "error while parsing ca-key: input did not contain a valid PEM encoded block")
assert.EqualError(t, signCert(args, ob, eb, nopw), "error while parsing ca-key: input did not contain a valid PEM encoded block")
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
@@ -98,7 +121,7 @@ func Test_signCert(t *testing.T) {
// failed to read cert
args = []string{"-ca-crt", "./nope", "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", "nope", "-out-key", "nope", "-duration", "100m"}
assert.EqualError(t, signCert(args, ob, eb), "error while reading ca-crt: open ./nope: "+NoSuchFileError)
assert.EqualError(t, signCert(args, ob, eb, nopw), "error while reading ca-crt: open ./nope: "+NoSuchFileError)
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
@@ -110,7 +133,7 @@ func Test_signCert(t *testing.T) {
defer os.Remove(caCrtF.Name())
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", "nope", "-out-key", "nope", "-duration", "100m"}
assert.EqualError(t, signCert(args, ob, eb), "error while parsing ca-crt: input did not contain a valid PEM encoded block")
assert.EqualError(t, signCert(args, ob, eb, nopw), "error while parsing ca-crt: input did not contain a valid PEM encoded block")
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
@@ -129,7 +152,7 @@ func Test_signCert(t *testing.T) {
// failed to read pub
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", "nope", "-in-pub", "./nope", "-duration", "100m"}
assert.EqualError(t, signCert(args, ob, eb), "error while reading in-pub: open ./nope: "+NoSuchFileError)
assert.EqualError(t, signCert(args, ob, eb, nopw), "error while reading in-pub: open ./nope: "+NoSuchFileError)
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
@@ -141,7 +164,7 @@ func Test_signCert(t *testing.T) {
defer os.Remove(inPubF.Name())
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", "nope", "-in-pub", inPubF.Name(), "-duration", "100m"}
assert.EqualError(t, signCert(args, ob, eb), "error while parsing in-pub: input did not contain a valid PEM encoded block")
assert.EqualError(t, signCert(args, ob, eb, nopw), "error while parsing in-pub: input did not contain a valid PEM encoded block")
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
@@ -155,14 +178,14 @@ func Test_signCert(t *testing.T) {
ob.Reset()
eb.Reset()
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "a1.1.1.1/24", "-out-crt", "nope", "-out-key", "nope", "-duration", "100m"}
assertHelpError(t, signCert(args, ob, eb), "invalid ip definition: invalid CIDR address: a1.1.1.1/24")
assertHelpError(t, signCert(args, ob, eb, nopw), "invalid ip definition: invalid CIDR address: a1.1.1.1/24")
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
ob.Reset()
eb.Reset()
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "100::100/100", "-out-crt", "nope", "-out-key", "nope", "-duration", "100m"}
assertHelpError(t, signCert(args, ob, eb), "invalid ip definition: can only be ipv4, have 100::100/100")
assertHelpError(t, signCert(args, ob, eb, nopw), "invalid ip definition: can only be ipv4, have 100::100/100")
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
@@ -170,14 +193,14 @@ func Test_signCert(t *testing.T) {
ob.Reset()
eb.Reset()
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", "nope", "-out-key", "nope", "-duration", "100m", "-subnets", "a"}
assertHelpError(t, signCert(args, ob, eb), "invalid subnet definition: invalid CIDR address: a")
assertHelpError(t, signCert(args, ob, eb, nopw), "invalid subnet definition: invalid CIDR address: a")
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
ob.Reset()
eb.Reset()
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", "nope", "-out-key", "nope", "-duration", "100m", "-subnets", "100::100/100"}
assertHelpError(t, signCert(args, ob, eb), "invalid subnet definition: can only be ipv4, have 100::100/100")
assertHelpError(t, signCert(args, ob, eb, nopw), "invalid subnet definition: can only be ipv4, have 100::100/100")
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
@@ -191,7 +214,7 @@ func Test_signCert(t *testing.T) {
ob.Reset()
eb.Reset()
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF2.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", "nope", "-out-key", "nope", "-duration", "100m", "-subnets", "a"}
assert.EqualError(t, signCert(args, ob, eb), "refusing to sign, root certificate does not match private key")
assert.EqualError(t, signCert(args, ob, eb, nopw), "refusing to sign, root certificate does not match private key")
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
@@ -199,7 +222,7 @@ func Test_signCert(t *testing.T) {
ob.Reset()
eb.Reset()
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", "/do/not/write/pleasecrt", "-out-key", "/do/not/write/pleasekey", "-duration", "100m", "-subnets", "10.1.1.1/32"}
assert.EqualError(t, signCert(args, ob, eb), "error while writing out-key: open /do/not/write/pleasekey: "+NoSuchDirError)
assert.EqualError(t, signCert(args, ob, eb, nopw), "error while writing out-key: open /do/not/write/pleasekey: "+NoSuchDirError)
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
@@ -212,7 +235,7 @@ func Test_signCert(t *testing.T) {
ob.Reset()
eb.Reset()
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", "/do/not/write/pleasecrt", "-out-key", keyF.Name(), "-duration", "100m", "-subnets", "10.1.1.1/32"}
assert.EqualError(t, signCert(args, ob, eb), "error while writing out-crt: open /do/not/write/pleasecrt: "+NoSuchDirError)
assert.EqualError(t, signCert(args, ob, eb, nopw), "error while writing out-crt: open /do/not/write/pleasecrt: "+NoSuchDirError)
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
os.Remove(keyF.Name())
@@ -226,7 +249,7 @@ func Test_signCert(t *testing.T) {
ob.Reset()
eb.Reset()
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", crtF.Name(), "-out-key", keyF.Name(), "-duration", "100m", "-subnets", "10.1.1.1/32, , 10.2.2.2/32 , , ,, 10.5.5.5/32", "-groups", "1,, 2 , ,,,3,4,5"}
assert.Nil(t, signCert(args, ob, eb))
assert.Nil(t, signCert(args, ob, eb, nopw))
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
@@ -268,7 +291,7 @@ func Test_signCert(t *testing.T) {
ob.Reset()
eb.Reset()
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", crtF.Name(), "-in-pub", inPubF.Name(), "-duration", "100m", "-groups", "1"}
assert.Nil(t, signCert(args, ob, eb))
assert.Nil(t, signCert(args, ob, eb, nopw))
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
@@ -283,7 +306,7 @@ func Test_signCert(t *testing.T) {
ob.Reset()
eb.Reset()
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", crtF.Name(), "-out-key", keyF.Name(), "-duration", "1000m", "-subnets", "10.1.1.1/32, , 10.2.2.2/32 , , ,, 10.5.5.5/32", "-groups", "1,, 2 , ,,,3,4,5"}
assert.EqualError(t, signCert(args, ob, eb), "refusing to sign, root certificate constraints violated: certificate expires after signing certificate")
assert.EqualError(t, signCert(args, ob, eb, nopw), "refusing to sign, root certificate constraints violated: certificate expires after signing certificate")
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
@@ -291,14 +314,14 @@ func Test_signCert(t *testing.T) {
os.Remove(keyF.Name())
os.Remove(crtF.Name())
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", crtF.Name(), "-out-key", keyF.Name(), "-duration", "100m", "-subnets", "10.1.1.1/32, , 10.2.2.2/32 , , ,, 10.5.5.5/32", "-groups", "1,, 2 , ,,,3,4,5"}
assert.Nil(t, signCert(args, ob, eb))
assert.Nil(t, signCert(args, ob, eb, nopw))
// test that we won't overwrite existing key file
os.Remove(crtF.Name())
ob.Reset()
eb.Reset()
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", crtF.Name(), "-out-key", keyF.Name(), "-duration", "100m", "-subnets", "10.1.1.1/32, , 10.2.2.2/32 , , ,, 10.5.5.5/32", "-groups", "1,, 2 , ,,,3,4,5"}
assert.EqualError(t, signCert(args, ob, eb), "refusing to overwrite existing key: "+keyF.Name())
assert.EqualError(t, signCert(args, ob, eb, nopw), "refusing to overwrite existing key: "+keyF.Name())
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
@@ -306,14 +329,83 @@ func Test_signCert(t *testing.T) {
os.Remove(keyF.Name())
os.Remove(crtF.Name())
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", crtF.Name(), "-out-key", keyF.Name(), "-duration", "100m", "-subnets", "10.1.1.1/32, , 10.2.2.2/32 , , ,, 10.5.5.5/32", "-groups", "1,, 2 , ,,,3,4,5"}
assert.Nil(t, signCert(args, ob, eb))
assert.Nil(t, signCert(args, ob, eb, nopw))
// test that we won't overwrite existing certificate file
os.Remove(keyF.Name())
ob.Reset()
eb.Reset()
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", crtF.Name(), "-out-key", keyF.Name(), "-duration", "100m", "-subnets", "10.1.1.1/32, , 10.2.2.2/32 , , ,, 10.5.5.5/32", "-groups", "1,, 2 , ,,,3,4,5"}
assert.EqualError(t, signCert(args, ob, eb), "refusing to overwrite existing cert: "+crtF.Name())
assert.EqualError(t, signCert(args, ob, eb, nopw), "refusing to overwrite existing cert: "+crtF.Name())
assert.Empty(t, ob.String())
assert.Empty(t, eb.String())
// create valid cert/key using encrypted CA key
os.Remove(caKeyF.Name())
os.Remove(caCrtF.Name())
os.Remove(keyF.Name())
os.Remove(crtF.Name())
ob.Reset()
eb.Reset()
caKeyF, err = ioutil.TempFile("", "sign-cert.key")
assert.Nil(t, err)
defer os.Remove(caKeyF.Name())
caCrtF, err = ioutil.TempFile("", "sign-cert.crt")
assert.Nil(t, err)
defer os.Remove(caCrtF.Name())
// generate the encrypted key
caPub, caPriv, _ = ed25519.GenerateKey(rand.Reader)
kdfParams := cert.NewArgon2Parameters(64*1024, 4, 3)
b, _ = cert.EncryptAndMarshalEd25519PrivateKey(caPriv, passphrase, kdfParams)
caKeyF.Write(b)
ca = cert.NebulaCertificate{
Details: cert.NebulaCertificateDetails{
Name: "ca",
NotBefore: time.Now(),
NotAfter: time.Now().Add(time.Minute * 200),
PublicKey: caPub,
IsCA: true,
},
}
b, _ = ca.MarshalToPEM()
caCrtF.Write(b)
// test with the proper password
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", crtF.Name(), "-out-key", keyF.Name(), "-duration", "100m", "-subnets", "10.1.1.1/32, , 10.2.2.2/32 , , ,, 10.5.5.5/32", "-groups", "1,, 2 , ,,,3,4,5"}
assert.Nil(t, signCert(args, ob, eb, testpw))
assert.Equal(t, "Enter passphrase: ", ob.String())
assert.Empty(t, eb.String())
// test with the wrong password
ob.Reset()
eb.Reset()
testpw.password = []byte("invalid password")
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", crtF.Name(), "-out-key", keyF.Name(), "-duration", "100m", "-subnets", "10.1.1.1/32, , 10.2.2.2/32 , , ,, 10.5.5.5/32", "-groups", "1,, 2 , ,,,3,4,5"}
assert.Error(t, signCert(args, ob, eb, testpw))
assert.Equal(t, "Enter passphrase: ", ob.String())
assert.Empty(t, eb.String())
// test with the user not entering a password
ob.Reset()
eb.Reset()
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", crtF.Name(), "-out-key", keyF.Name(), "-duration", "100m", "-subnets", "10.1.1.1/32, , 10.2.2.2/32 , , ,, 10.5.5.5/32", "-groups", "1,, 2 , ,,,3,4,5"}
assert.Error(t, signCert(args, ob, eb, nopw))
// normally the user hitting enter on the prompt would add newlines between these
assert.Equal(t, "Enter passphrase: Enter passphrase: Enter passphrase: Enter passphrase: Enter passphrase: ", ob.String())
assert.Empty(t, eb.String())
// test an error condition
ob.Reset()
eb.Reset()
args = []string{"-ca-crt", caCrtF.Name(), "-ca-key", caKeyF.Name(), "-name", "test", "-ip", "1.1.1.1/24", "-out-crt", crtF.Name(), "-out-key", keyF.Name(), "-duration", "100m", "-subnets", "10.1.1.1/32, , 10.2.2.2/32 , , ,, 10.5.5.5/32", "-groups", "1,, 2 , ,,,3,4,5"}
assert.Error(t, signCert(args, ob, eb, errpw))
assert.Equal(t, "Enter passphrase: ", ob.String())
assert.Empty(t, eb.String())
}