service: define BearerToken interface

service/bearer.go

@@ -0,0 +1,96 @@
+package service
+
+import (
+	"crypto/ecdsa"
+	"io"
+
+	"github.com/nspcc-dev/neofs-api-go/refs"
+	crypto "github.com/nspcc-dev/neofs-crypto"
+)
+
+type signedBearerToken struct {
+	BearerToken
+}
+
+const fixedBearerTokenDataSize = 0 +
+	refs.OwnerIDSize +
+	8
+
+// NewSignedBearerToken wraps passed BearerToken in a component suitable for signing.
+//
+// Result can be used in AddSignatureWithKey function.
+func NewSignedBearerToken(token BearerToken) DataWithSignKeyAccumulator {
+	return &signedBearerToken{
+		BearerToken: token,
+	}
+}
+
+// NewVerifiedBearerToken wraps passed SessionToken in a component suitable for signature verification.
+//
+// Result can be used in VerifySignatureWithKey function.
+func NewVerifiedBearerToken(token BearerToken) DataWithSignature {
+	return &signedBearerToken{
+		BearerToken: token,
+	}
+}
+
+// AddSignKey calls a Signature field setter and an OwnerKey field setter with corresponding arguments.
+func (s signedBearerToken) AddSignKey(sig []byte, key *ecdsa.PublicKey) {
+	if s.BearerToken != nil {
+		s.SetSignature(sig)
+
+		s.SetOwnerKey(
+			crypto.MarshalPublicKey(key),
+		)
+	}
+}
+
+// SignedData returns token information in a binary representation.
+func (s signedBearerToken) SignedData() ([]byte, error) {
+	return SignedDataFromReader(s)
+}
+
+// SignedDataSize returns the length of signed token information slice.
+func (s signedBearerToken) SignedDataSize() int {
+	return bearerTokenInfoSize(s.BearerToken)
+}
+
+// ReadSignedData copies a binary representation of the token information to passed buffer.
+//
+// If buffer length is less than required, io.ErrUnexpectedEOF returns.
+func (s signedBearerToken) ReadSignedData(p []byte) (int, error) {
+	sz := s.SignedDataSize()
+	if len(p) < sz {
+		return 0, io.ErrUnexpectedEOF
+	}
+
+	copyBearerTokenSignedData(p, s.BearerToken)
+
+	return sz, nil
+}
+
+func bearerTokenInfoSize(v ACLRulesSource) int {
+	if v == nil {
+		return 0
+	}
+	return fixedBearerTokenDataSize + len(v.GetACLRules())
+}
+
+// Fills passed buffer with signing token information bytes.
+// Does not check buffer length, it is understood that enough space is allocated in it.
+//
+// If passed BearerTokenInfo, buffer remains unchanged.
+func copyBearerTokenSignedData(buf []byte, token BearerTokenInfo) {
+	if token == nil {
+		return
+	}
+
+	var off int
+
+	off += copy(buf[off:], token.GetACLRules())
+
+	off += copy(buf[off:], token.GetOwnerID().Bytes())
+
+	tokenEndianness.PutUint64(buf[off:], token.ExpirationEpoch())
+	off += 8
+}

service/bearer_test.go

@@ -0,0 +1,172 @@
+package service
+
+import (
+	"crypto/rand"
+	"testing"
+
+	"github.com/nspcc-dev/neofs-crypto/test"
+	"github.com/stretchr/testify/require"
+)
+
+type testBearerToken struct {
+	aclRules []byte
+	expEpoch uint64
+	owner    OwnerID
+	key      []byte
+	sig      []byte
+}
+
+func (s testBearerToken) GetACLRules() []byte {
+	return s.aclRules
+}
+
+func (s *testBearerToken) SetACLRules(v []byte) {
+	s.aclRules = v
+}
+
+func (s testBearerToken) ExpirationEpoch() uint64 {
+	return s.expEpoch
+}
+
+func (s *testBearerToken) SetExpirationEpoch(v uint64) {
+	s.expEpoch = v
+}
+
+func (s testBearerToken) GetOwnerID() OwnerID {
+	return s.owner
+}
+
+func (s *testBearerToken) SetOwnerID(v OwnerID) {
+	s.owner = v
+}
+
+func (s testBearerToken) GetOwnerKey() []byte {
+	return s.key
+}
+
+func (s *testBearerToken) SetOwnerKey(v []byte) {
+	s.key = v
+}
+
+func (s testBearerToken) GetSignature() []byte {
+	return s.sig
+}
+
+func (s *testBearerToken) SetSignature(v []byte) {
+	s.sig = v
+}
+
+func TestBearerTokenMsgGettersSetters(t *testing.T) {
+	var tok BearerToken = new(testBearerToken)
+
+	{ // ACLRules
+		rules := []byte{1, 2, 3}
+
+		tok.SetACLRules(rules)
+
+		require.Equal(t, rules, tok.GetACLRules())
+	}
+
+	{ // OwnerID
+		ownerID := OwnerID{}
+		_, err := rand.Read(ownerID[:])
+		require.NoError(t, err)
+
+		tok.SetOwnerID(ownerID)
+
+		require.Equal(t, ownerID, tok.GetOwnerID())
+	}
+
+	{ // ValidUntil
+		e := uint64(5)
+
+		tok.SetExpirationEpoch(e)
+
+		require.Equal(t, e, tok.ExpirationEpoch())
+	}
+
+	{ // OwnerKey
+		key := make([]byte, 10)
+		_, err := rand.Read(key)
+		require.NoError(t, err)
+
+		tok.SetOwnerKey(key)
+
+		require.Equal(t, key, tok.GetOwnerKey())
+	}
+
+	{ // Signature
+		sig := make([]byte, 10)
+		_, err := rand.Read(sig)
+		require.NoError(t, err)
+
+		tok.SetSignature(sig)
+
+		require.Equal(t, sig, tok.GetSignature())
+	}
+}
+
+func TestSignVerifyBearerToken(t *testing.T) {
+	var token BearerToken = new(testBearerToken)
+
+	// create private key for signing
+	sk := test.DecodeKey(0)
+	pk := &sk.PublicKey
+
+	rules := []byte{1, 2, 3}
+	token.SetACLRules(rules)
+
+	ownerID := OwnerID{}
+	_, err := rand.Read(ownerID[:])
+	require.NoError(t, err)
+	token.SetOwnerID(ownerID)
+
+	fEpoch := uint64(2)
+	token.SetExpirationEpoch(fEpoch)
+
+	signedToken := NewSignedBearerToken(token)
+	verifiedToken := NewVerifiedBearerToken(token)
+
+	// sign and verify token
+	require.NoError(t, AddSignatureWithKey(sk, signedToken))
+	require.NoError(t, VerifySignatureWithKey(pk, verifiedToken))
+
+	items := []struct {
+		corrupt func()
+		restore func()
+	}{
+		{ // ACLRules
+			corrupt: func() {
+				token.SetACLRules(append(rules, 1))
+			},
+			restore: func() {
+				token.SetACLRules(rules)
+			},
+		},
+		{ // Owner ID
+			corrupt: func() {
+				ownerID[0]++
+				token.SetOwnerID(ownerID)
+			},
+			restore: func() {
+				ownerID[0]--
+				token.SetOwnerID(ownerID)
+			},
+		},
+		{ // Expiration epoch
+			corrupt: func() {
+				token.SetExpirationEpoch(fEpoch + 1)
+			},
+			restore: func() {
+				token.SetExpirationEpoch(fEpoch)
+			},
+		},
+	}
+
+	for _, v := range items {
+		v.corrupt()
+		require.Error(t, VerifySignatureWithKey(pk, verifiedToken))
+		v.restore()
+		require.NoError(t, VerifySignatureWithKey(pk, verifiedToken))
+	}
+}

service/types.go

@@ -267,3 +267,37 @@ type RequestVerifyData interface {
 	RequestData
 	SignKeyPairSource
 }
+
+// ACLRulesSource is an interface of the container of binary extended ACL rules with read access.
+type ACLRulesSource interface {
+	GetACLRules() []byte
+}
+
+// ACLRulesContainer is an interface of the container of binary extended ACL rules.
+type ACLRulesContainer interface {
+	ACLRulesSource
+	SetACLRules([]byte)
+}
+
+// BearerTokenInfo is an interface of a fixed set of Bearer token information value containers.
+// Contains:
+// - binary extended ACL rules;
+// - expiration epoch number;
+// - ID of the token's owner.
+type BearerTokenInfo interface {
+	ACLRulesContainer
+	ExpirationEpochContainer
+	OwnerIDContainer
+}
+
+// BearerToken is an interface of Bearer token information and key-signature pair.
+type BearerToken interface {
+	BearerTokenInfo
+	OwnerKeyContainer
+	SignatureContainer
+}
+
+// BearerTokenSource is an interface of the container of a BearerToken with read access.
+type BearerTokenSource interface {
+	GetBearerToken() BearerToken
+}