80 lines
2.7 KiB
Go
80 lines
2.7 KiB
Go
package mirror
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import (
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"bytes"
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"context"
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"crypto"
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"crypto/rand"
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"crypto/rsa"
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"encoding/binary"
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"math/big"
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"os"
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"path/filepath"
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"testing"
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"github.com/ProtonMail/go-crypto/openpgp"
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"github.com/ProtonMail/go-crypto/openpgp/armor"
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"github.com/ProtonMail/go-crypto/openpgp/packet"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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// TestVerifyLegacyDetachedSignature locks the OpenPGP version 3 RSA packet
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// shape used by GnuPG v1 to sign archived CentOS 7 repomd.xml files.
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func TestVerifyLegacyDetachedSignature(t *testing.T) {
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entity, err := openpgp.NewEntity("CentOS fixture", "", "security@example.com", nil)
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require.NoError(t, err)
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privateKey, ok := entity.PrivateKey.PrivateKey.(*rsa.PrivateKey)
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require.True(t, ok)
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data := []byte("signed repository metadata\n")
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hashed := make([]byte, 5)
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hashed[0] = byte(packet.SigTypeBinary)
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binary.BigEndian.PutUint32(hashed[1:], 1678292750)
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h := crypto.SHA256.New()
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_, _ = h.Write(data)
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_, _ = h.Write(hashed)
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digest := h.Sum(nil)
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rsaSignature, err := rsa.SignPKCS1v15(rand.Reader, privateKey, crypto.SHA256, digest)
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require.NoError(t, err)
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mpi := new(big.Int).SetBytes(rsaSignature)
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mpiBytes := mpi.Bytes()
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body := []byte{3, 5}
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body = append(body, hashed...)
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body = binary.BigEndian.AppendUint64(body, entity.PrimaryKey.KeyId)
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body = append(body, byte(packet.PubKeyAlgoRSA), 8, digest[0], digest[1])
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body = binary.BigEndian.AppendUint16(body, uint16(mpi.BitLen()))
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body = append(body, mpiBytes...)
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var packetData bytes.Buffer
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require.NoError(t, (&packet.OpaquePacket{Tag: 2, Contents: body}).Serialize(&packetData))
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var signature bytes.Buffer
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armoredSignature, err := armor.Encode(&signature, openpgp.SignatureType, nil)
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require.NoError(t, err)
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_, err = armoredSignature.Write(packetData.Bytes())
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require.NoError(t, err)
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require.NoError(t, armoredSignature.Close())
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var publicKey bytes.Buffer
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armoredKey, err := armor.Encode(&publicKey, openpgp.PublicKeyType, nil)
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require.NoError(t, err)
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require.NoError(t, entity.Serialize(armoredKey))
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require.NoError(t, armoredKey.Close())
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dir := t.TempDir()
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dataPath := filepath.Join(dir, "repomd.xml")
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sigPath := dataPath + ".asc"
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keyPath := dataPath + ".key"
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require.NoError(t, os.WriteFile(dataPath, data, 0644))
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require.NoError(t, os.WriteFile(sigPath, signature.Bytes(), 0644))
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require.NoError(t, os.WriteFile(keyPath, publicKey.Bytes(), 0644))
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verifier := &signatureVerifier{}
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fingerprint, err := verifier.verifyDetached(context.Background(), dataPath, sigPath, keyPath)
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require.NoError(t, err)
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assert.NotEmpty(t, fingerprint)
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require.NoError(t, os.WriteFile(dataPath, []byte("modified repository metadata\n"), 0644))
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_, err = verifier.verifyDetached(context.Background(), dataPath, sigPath, keyPath)
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assert.Error(t, err)
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}
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