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package sshutil
import (
"bytes"
"crypto"
"crypto/dsa" //nolint:staticcheck // support for DSA fingerprints
"crypto/rand"
"encoding/base64"
"encoding/hex"
"testing"
"go.step.sm/crypto/internal/emoji"
"golang.org/x/crypto/ssh"
)
func generateCertificate(t *testing.T) ssh.PublicKey {
t.Helper()
key, signer := mustGenerateKey(t)
cert, err := CreateCertificate(&ssh.Certificate{
Nonce: []byte("0123456789"),
Key: key,
Serial: 123,
CertType: ssh.HostCert,
KeyId: "foo",
ValidPrincipals: []string{"foo.internal"},
ValidAfter: 1111,
ValidBefore: 2222,
Permissions: ssh.Permissions{},
Reserved: []byte("reserved"),
}, signer)
if err != nil {
t.Fatal(err)
}
return cert
}
func TestFingerprint(t *testing.T) {
ecKey, sshECKey := generateKey(t, "EC", "P-256", 0)
edKey, sshEDKey := generateKey(t, "OKP", "Ed25519", 0)
_, sshRSAKey := generateKey(t, "RSA", "", 2048)
skECKey := generateFakeSKKey(t, ecKey)
skEDKey := generateFakeSKKey(t, edKey)
sshCert := generateCertificate(t)
type args struct {
pub ssh.PublicKey
}
tests := []struct {
name string
args args
want string
}{
{"ok ECDSA", args{sshECKey}, ssh.FingerprintSHA256(sshECKey)},
{"ok ED25519", args{sshEDKey}, ssh.FingerprintSHA256(sshEDKey)},
{"ok RSA", args{sshRSAKey}, ssh.FingerprintSHA256(sshRSAKey)},
{"ok SK-ECDSA", args{skECKey}, ssh.FingerprintSHA256(skECKey)},
{"ok SK-ED25519", args{skEDKey}, ssh.FingerprintSHA256(skEDKey)},
{"ok CERT", args{sshCert}, ssh.FingerprintSHA256(sshCert)},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if got := Fingerprint(tt.args.pub); got != tt.want {
t.Errorf("Fingerprint() = %v, want %v", got, tt.want)
}
})
}
}
func TestEncodedFingerprint(t *testing.T) {
_, sshECKey := generateKey(t, "EC", "P-256", 0)
expected := ssh.FingerprintSHA256(sshECKey)
b, err := base64.RawStdEncoding.DecodeString(expected[7:])
if err != nil {
t.Fatal(err)
}
type args struct {
pub ssh.PublicKey
encoding FingerprintEncoding
}
tests := []struct {
name string
args args
want string
}{
{"default", args{sshECKey, 0}, ssh.FingerprintSHA256(sshECKey)},
{"Base64RawFingerprint", args{sshECKey, Base64RawFingerprint}, expected},
{"Base64RawURLFingerprint", args{sshECKey, Base64RawURLFingerprint}, "SHA256:" + base64.RawURLEncoding.EncodeToString(b)},
{"Base64Fingerprint", args{sshECKey, Base64Fingerprint}, "SHA256:" + base64.StdEncoding.EncodeToString(b)},
{"Base64URLFingerprint", args{sshECKey, Base64URLFingerprint}, "SHA256:" + base64.URLEncoding.EncodeToString(b)},
{"HexFingerprint", args{sshECKey, HexFingerprint}, "SHA256:" + hex.EncodeToString(b)},
{"EmojiFingerprint", args{sshECKey, EmojiFingerprint}, "SHA256:" + emoji.Emoji(b)},
{"fail", args{sshECKey, 100}, ""},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if got := EncodedFingerprint(tt.args.pub, tt.args.encoding); got != tt.want {
t.Errorf("EncodedFingerprint() = %v, want %v", got, tt.want)
}
})
}
}
func TestFormatFingerprint(t *testing.T) {
ecKey, sshECKey := generateKey(t, "EC", "P-256", 0)
_, sshEC384Key := generateKey(t, "EC", "P-384", 0)
_, sshEC521Key := generateKey(t, "EC", "P-521", 0)
edKey, sshEDKey := generateKey(t, "OKP", "Ed25519", 0)
_, sshRSAKey := generateKey(t, "RSA", "", 2048)
skECKey := generateFakeSKKey(t, ecKey)
skEDKey := generateFakeSKKey(t, edKey)
sshCert := generateCertificate(t)
dsaKey := new(dsa.PrivateKey)
if err := dsa.GenerateParameters(&dsaKey.Parameters, rand.Reader, dsa.L1024N160); err != nil {
t.Fatal(err)
}
if err := dsa.GenerateKey(dsaKey, rand.Reader); err != nil {
t.Fatal(err)
}
dsaSigner, err := ssh.NewSignerFromKey(dsaKey)
if err != nil {
t.Fatal(err)
}
sshDSAKey := dsaSigner.PublicKey()
ec256Bytes, err := base64.RawStdEncoding.DecodeString(ssh.FingerprintSHA256(sshECKey)[7:])
if err != nil {
t.Fatal(err)
}
marshal := func(pub ssh.PublicKey, comment string) []byte {
b := &bytes.Buffer{}
b.WriteString(pub.Type())
b.WriteByte(' ')
e := base64.NewEncoder(base64.StdEncoding, b)
_, _ = e.Write(pub.Marshal())
e.Close()
if comment != "" {
b.WriteString(" " + comment)
}
b.WriteByte('\n')
return b.Bytes()
}
type args struct {
in []byte
encoding FingerprintEncoding
}
tests := []struct {
name string
args args
want string
wantErr bool
}{
{"P256", args{marshal(sshECKey, "jane@example.com"), 0}, "256 " + ssh.FingerprintSHA256(sshECKey) + " jane@example.com (ECDSA)", false},
{"P384", args{marshal(sshEC384Key, "jane@example.com"), 0}, "384 " + ssh.FingerprintSHA256(sshEC384Key) + " jane@example.com (ECDSA)", false},
{"P521", args{marshal(sshEC521Key, "jane@example.com"), 0}, "521 " + ssh.FingerprintSHA256(sshEC521Key) + " jane@example.com (ECDSA)", false},
{"Ed25519", args{marshal(sshEDKey, "jane@example.com"), 0}, "256 " + ssh.FingerprintSHA256(sshEDKey) + " jane@example.com (ED25519)", false},
{"RSA", args{marshal(sshRSAKey, "jane@example.com"), 0}, "2048 " + ssh.FingerprintSHA256(sshRSAKey) + " jane@example.com (RSA)", false},
{"SK-ECDSA", args{marshal(skECKey, "jane@example.com"), 0}, "256 " + ssh.FingerprintSHA256(skECKey) + " jane@example.com (SK-ECDSA)", false},
{"SK-ED25519", args{marshal(skEDKey, "jane@example.com"), 0}, "256 " + ssh.FingerprintSHA256(skEDKey) + " jane@example.com (SK-ED25519)", false},
{"ED25519-CERT", args{marshal(sshCert, "jane@example.com"), 0}, "256 " + ssh.FingerprintSHA256(sshCert) + " jane@example.com (ED25519-CERT)", false},
{"DSA", args{marshal(sshDSAKey, "jane@example.com"), 0}, "1024 " + ssh.FingerprintSHA256(sshDSAKey) + " jane@example.com (DSA)", false},
{"Base64RawFingerprint", args{marshal(sshECKey, ""), Base64RawFingerprint}, "256 " + ssh.FingerprintSHA256(sshECKey) + " no comment (ECDSA)", false},
{"Base64RawURLFingerprint", args{marshal(sshECKey, ""), Base64RawURLFingerprint}, "256 SHA256:" + base64.RawURLEncoding.EncodeToString(ec256Bytes) + " no comment (ECDSA)", false},
{"Base64Fingerprint", args{marshal(sshECKey, ""), Base64Fingerprint}, "256 SHA256:" + base64.StdEncoding.EncodeToString(ec256Bytes) + " no comment (ECDSA)", false},
{"Base64UrlFingerprint", args{marshal(sshECKey, ""), Base64URLFingerprint}, "256 SHA256:" + base64.URLEncoding.EncodeToString(ec256Bytes) + " no comment (ECDSA)", false},
{"HexFingerprint", args{marshal(sshECKey, ""), HexFingerprint}, "256 SHA256:" + hex.EncodeToString(ec256Bytes) + " no comment (ECDSA)", false},
{"EmojiFingerprint", args{marshal(sshECKey, ""), EmojiFingerprint}, "256 SHA256:" + emoji.Emoji(ec256Bytes) + " no comment (ECDSA)", false},
{"fail input", args{marshal(sshECKey, "")[:50], EmojiFingerprint}, "", true},
{"fail encoding", args{marshal(sshECKey, ""), 100}, "", true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := FormatFingerprint(tt.args.in, tt.args.encoding)
if (err != nil) != tt.wantErr {
t.Errorf("FormatFingerprint() error = %v, wantErr %v", err, tt.wantErr)
return
}
if got != tt.want {
t.Errorf("FormatFingerprint() = %v, want %v", got, tt.want)
}
})
}
}
type fakeKey struct {
typ string
bytes []byte
}
func (s *fakeKey) Type() string { return s.typ }
func (s *fakeKey) Marshal() []byte { return s.bytes }
func (s *fakeKey) Verify(data []byte, sig *ssh.Signature) error { return nil }
type fakeCryptoPublicKey struct {
typ string
key crypto.PublicKey
bytes []byte
}
func (s *fakeCryptoPublicKey) Type() string { return s.typ }
func (s *fakeCryptoPublicKey) Marshal() []byte { return s.bytes }
func (s *fakeCryptoPublicKey) Verify(data []byte, sig *ssh.Signature) error { return nil }
func (s *fakeCryptoPublicKey) CryptoPublicKey() crypto.PublicKey { return s.key }
func Test_publicKeyTypeAndSize_errors(t *testing.T) {
ecKey, _ := generateKey(t, "EC", "P-256", 0)
type args struct {
key ssh.PublicKey
}
tests := []struct {
name string
args args
want string
want1 int
wantErr bool
}{
{"fail RSA", args{&fakeKey{ssh.KeyAlgoRSA, nil}}, "", 0, true},
{"fail DSA", args{&fakeKey{ssh.KeyAlgoDSA, nil}}, "", 0, true},
{"fail RSA cast", args{&fakeCryptoPublicKey{ssh.KeyAlgoRSA, ecKey, nil}}, "", 0, true},
{"fail DSA cast", args{&fakeCryptoPublicKey{ssh.KeyAlgoDSA, ecKey, nil}}, "", 0, true},
{"fail type", args{&fakeKey{"unknown-type", nil}}, "", 0, true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, got1, err := publicKeyTypeAndSize(tt.args.key)
if (err != nil) != tt.wantErr {
t.Errorf("publicKeyTypeAndSize() error = %v, wantErr %v", err, tt.wantErr)
return
}
if got != tt.want {
t.Errorf("publicKeyTypeAndSize() got = %v, want %v", got, tt.want)
}
if got1 != tt.want1 {
t.Errorf("publicKeyTypeAndSize() got1 = %v, want %v", got1, tt.want1)
}
})
}
}
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