frostfs-api-go/session/types.go

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package session
import (
"crypto/ecdsa"
"encoding/binary"
"sync"
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"github.com/nspcc-dev/neofs-api-go/chain"
"github.com/nspcc-dev/neofs-api-go/internal"
"github.com/nspcc-dev/neofs-api-go/refs"
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crypto "github.com/nspcc-dev/neofs-crypto"
"github.com/pkg/errors"
)
type (
// ObjectID type alias.
ObjectID = refs.ObjectID
// OwnerID type alias.
OwnerID = refs.OwnerID
// TokenID type alias.
TokenID = refs.UUID
// PToken is a wrapper around Token that allows to sign data
// and to do thread-safe manipulations.
PToken struct {
Token
mtx *sync.Mutex
PrivateKey *ecdsa.PrivateKey
}
)
const (
// ErrWrongFirstEpoch is raised when passed Token contains wrong first epoch.
// First epoch is an epoch since token is valid
ErrWrongFirstEpoch = internal.Error("wrong first epoch")
// ErrWrongLastEpoch is raised when passed Token contains wrong last epoch.
// Last epoch is an epoch until token is valid
ErrWrongLastEpoch = internal.Error("wrong last epoch")
// ErrWrongOwner is raised when passed Token contains wrong OwnerID.
ErrWrongOwner = internal.Error("wrong owner")
// ErrEmptyPublicKey is raised when passed Token contains wrong public key.
ErrEmptyPublicKey = internal.Error("empty public key")
// ErrWrongObjectsCount is raised when passed Token contains wrong objects count.
ErrWrongObjectsCount = internal.Error("wrong objects count")
// ErrWrongObjects is raised when passed Token contains wrong object ids.
ErrWrongObjects = internal.Error("wrong objects")
// ErrInvalidSignature is raised when wrong signature is passed to VerificationHeader.VerifyData().
ErrInvalidSignature = internal.Error("invalid signature")
)
// verificationData returns byte array to sign.
// Note: protobuf serialization is inconsistent as
// wire order is unspecified.
func (m *Token) verificationData() (data []byte) {
var size int
if l := len(m.ObjectID); l > 0 {
size = m.ObjectID[0].Size()
data = make([]byte, 16+l*size)
} else {
data = make([]byte, 16)
}
binary.BigEndian.PutUint64(data, m.FirstEpoch)
binary.BigEndian.PutUint64(data[8:], m.LastEpoch)
for i := range m.ObjectID {
copy(data[16+i*size:], m.ObjectID[i].Bytes())
}
return
}
// IsSame checks if the passed token is valid and equal to current token
func (m *Token) IsSame(t *Token) error {
switch {
case m.FirstEpoch != t.FirstEpoch:
return ErrWrongFirstEpoch
case m.LastEpoch != t.LastEpoch:
return ErrWrongLastEpoch
case !m.OwnerID.Equal(t.OwnerID):
return ErrWrongOwner
case m.Header.PublicKey == nil:
return ErrEmptyPublicKey
case len(m.ObjectID) != len(t.ObjectID):
return ErrWrongObjectsCount
default:
for i := range m.ObjectID {
if !m.ObjectID[i].Equal(t.ObjectID[i]) {
return errors.Wrapf(ErrWrongObjects, "expect %s, actual: %s", m.ObjectID[i], t.ObjectID[i])
}
}
}
return nil
}
// Sign tries to sign current Token data and stores signature inside it.
func (m *Token) Sign(key *ecdsa.PrivateKey) error {
if err := m.Header.Sign(key); err != nil {
return err
}
s, err := crypto.Sign(key, m.verificationData())
if err != nil {
return err
}
m.Signature = s
return nil
}
// SetPublicKeys sets owner's public keys to the token
func (m *Token) SetPublicKeys(keys ...*ecdsa.PublicKey) {
m.PublicKeys = m.PublicKeys[:0]
for i := range keys {
m.PublicKeys = append(m.PublicKeys, crypto.MarshalPublicKey(keys[i]))
}
}
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// Verify checks if token is correct and signed.
func (m *Token) Verify(keys ...*ecdsa.PublicKey) bool {
if m.FirstEpoch > m.LastEpoch {
return false
}
ownerFromKeys := chain.KeysToAddress(keys...)
if m.OwnerID.String() != ownerFromKeys {
return false
}
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for i := range keys {
if m.Header.Verify(keys[i]) && crypto.Verify(keys[i], m.verificationData(), m.Signature) == nil {
return true
}
}
return false
}
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// AddSignatures adds token signatures.
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func (t *PToken) AddSignatures(signH, signT []byte) {
t.mtx.Lock()
t.Header.KeySignature = signH
t.Signature = signT
t.mtx.Unlock()
}
// SignData signs data with session private key.
func (t *PToken) SignData(data []byte) ([]byte, error) {
return crypto.Sign(t.PrivateKey, data)
}
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// VerifyData checks if signature of data by token is equal to sign.
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func (m *VerificationHeader) VerifyData(data, sign []byte) error {
if crypto.Verify(crypto.UnmarshalPublicKey(m.PublicKey), data, sign) != nil {
return ErrInvalidSignature
}
return nil
}
// Verify checks if verification header was issued by id.
func (m *VerificationHeader) Verify(keys ...*ecdsa.PublicKey) bool {
for i := range keys {
if crypto.Verify(keys[i], m.PublicKey, m.KeySignature) == nil {
return true
}
}
return false
}
// UnmarshalPublicKeys returns unmarshal public keys from the token
func UnmarshalPublicKeys(t *Token) []*ecdsa.PublicKey {
r := make([]*ecdsa.PublicKey, 0, len(t.PublicKeys))
for i := range t.PublicKeys {
r = append(r, crypto.UnmarshalPublicKey(t.PublicKeys[i]))
}
return r
}