frostfs-api-go/service/verify.go

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package service
import (
"crypto/ecdsa"
crypto "github.com/nspcc-dev/neofs-crypto"
"github.com/nspcc-dev/neofs-proto/internal"
"github.com/nspcc-dev/neofs-proto/refs"
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"github.com/pkg/errors"
)
type (
// VerifiableRequest adds possibility to sign and verify request header.
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VerifiableRequest interface {
Marshal() ([]byte, error)
AddSignature(*RequestVerificationHeader_Signature)
GetSignatures() []*RequestVerificationHeader_Signature
SetSignatures([]*RequestVerificationHeader_Signature)
}
// MaintainableRequest adds possibility to set and get (+validate)
// owner (client) public key from RequestVerificationHeader.
MaintainableRequest interface {
GetOwner() (*ecdsa.PublicKey, error)
SetOwner(*ecdsa.PublicKey, []byte)
GetLastPeer() (*ecdsa.PublicKey, error)
}
)
const (
// ErrCannotLoadPublicKey is raised when cannot unmarshal public key from RequestVerificationHeader_Sign.
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ErrCannotLoadPublicKey = internal.Error("cannot load public key")
// ErrCannotFindOwner is raised when signatures empty in GetOwner.
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ErrCannotFindOwner = internal.Error("cannot find owner public key")
// ErrWrongOwner is raised when passed OwnerID not equal to present PublicKey
ErrWrongOwner = internal.Error("wrong owner")
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)
// SetSignatures replaces signatures stored in RequestVerificationHeader.
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func (m *RequestVerificationHeader) SetSignatures(signatures []*RequestVerificationHeader_Signature) {
m.Signatures = signatures
}
// AddSignature adds new Signature into RequestVerificationHeader.
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func (m *RequestVerificationHeader) AddSignature(sig *RequestVerificationHeader_Signature) {
if sig == nil {
return
}
m.Signatures = append(m.Signatures, sig)
}
// SetOwner adds origin (sign and public key) of owner (client) into first signature.
func (m *RequestVerificationHeader) SetOwner(pub *ecdsa.PublicKey, sign []byte) {
if len(m.Signatures) == 0 || pub == nil {
return
}
m.Signatures[0].Origin = &RequestVerificationHeader_Sign{
Sign: sign,
Peer: crypto.MarshalPublicKey(pub),
}
}
// CheckOwner validates, that passed OwnerID is equal to present PublicKey of owner.
func (m *RequestVerificationHeader) CheckOwner(owner refs.OwnerID) error {
if key, err := m.GetOwner(); err != nil {
return err
} else if user, err := refs.NewOwnerID(key); err != nil {
return err
} else if !user.Equal(owner) {
return ErrWrongOwner
}
return nil
}
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// GetOwner tries to get owner (client) public key from signatures.
// If signatures contains not empty Origin, we should try to validate,
// that session key was signed by owner (client), otherwise return error.
func (m *RequestVerificationHeader) GetOwner() (*ecdsa.PublicKey, error) {
if len(m.Signatures) == 0 {
return nil, ErrCannotFindOwner
}
// if first signature contains origin, we should try to validate session key
if m.Signatures[0].Origin != nil {
owner := crypto.UnmarshalPublicKey(m.Signatures[0].Origin.Peer)
if owner == nil {
return nil, ErrCannotLoadPublicKey
} else if err := crypto.Verify(owner, m.Signatures[0].Peer, m.Signatures[0].Origin.Sign); err != nil {
return nil, errors.Wrap(err, "could not verify session token")
}
return owner, nil
} else if key := crypto.UnmarshalPublicKey(m.Signatures[0].Peer); key != nil {
return key, nil
}
return nil, ErrCannotLoadPublicKey
}
// GetLastPeer tries to get last peer public key from signatures.
// If signatures has zero length, returns ErrCannotFindOwner.
// If signatures has length equal to one, uses GetOwner.
// Otherwise tries to unmarshal last peer public key.
func (m *RequestVerificationHeader) GetLastPeer() (*ecdsa.PublicKey, error) {
switch ln := len(m.Signatures); ln {
case 0:
return nil, ErrCannotFindOwner
case 1:
return m.GetOwner()
default:
if key := crypto.UnmarshalPublicKey(m.Signatures[ln-1].Peer); key != nil {
return key, nil
}
return nil, ErrCannotLoadPublicKey
}
}
func newSignature(key *ecdsa.PrivateKey, data []byte) (*RequestVerificationHeader_Signature, error) {
sign, err := crypto.Sign(key, data)
if err != nil {
return nil, err
}
return &RequestVerificationHeader_Signature{
RequestVerificationHeader_Sign: RequestVerificationHeader_Sign{
Sign: sign,
Peer: crypto.MarshalPublicKey(&key.PublicKey),
},
}, nil
}
// SignRequestHeader receives private key and request with RequestVerificationHeader,
// tries to marshal and sign request with passed PrivateKey, after that adds
// new signature to headers. If something went wrong, returns error.
func SignRequestHeader(key *ecdsa.PrivateKey, msg VerifiableRequest) error {
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// ignore meta header
if meta, ok := msg.(MetaHeader); ok {
h := meta.ResetMeta()
defer func() {
meta.RestoreMeta(h)
}()
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}
data, err := msg.Marshal()
if err != nil {
return err
}
signature, err := newSignature(key, data)
if err != nil {
return err
}
msg.AddSignature(signature)
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return nil
}
// VerifyRequestHeader receives request with RequestVerificationHeader,
// tries to marshal and verify each signature from request.
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// If something went wrong, returns error.
func VerifyRequestHeader(msg VerifiableRequest) error {
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// ignore meta header
if meta, ok := msg.(MetaHeader); ok {
h := meta.ResetMeta()
defer func() {
meta.RestoreMeta(h)
}()
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}
signatures := msg.GetSignatures()
defer func() {
msg.SetSignatures(signatures)
}()
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for i := range signatures {
msg.SetSignatures(signatures[:i])
peer := signatures[i].GetPeer()
sign := signatures[i].GetSign()
key := crypto.UnmarshalPublicKey(peer)
if key == nil {
return errors.Wrapf(ErrCannotLoadPublicKey, "%d: %02x", i, peer)
}
if data, err := msg.Marshal(); err != nil {
return errors.Wrapf(err, "%d: %02x", i, peer)
} else if err := crypto.Verify(key, data, sign); err != nil {
return errors.Wrapf(err, "%d: %02x", i, peer)
}
}
return nil
}
// testCustomField for test usage only.
type testCustomField [8]uint32
var _ internal.Custom = (*testCustomField)(nil)
// Reset skip, it's for test usage only.
func (t testCustomField) Reset() {}
// ProtoMessage skip, it's for test usage only.
func (t testCustomField) ProtoMessage() {}
// Size skip, it's for test usage only.
func (t testCustomField) Size() int { return 32 }
// String skip, it's for test usage only.
func (t testCustomField) String() string { return "" }
// Bytes skip, it's for test usage only.
func (t testCustomField) Bytes() []byte { return nil }
// Unmarshal skip, it's for test usage only.
func (t testCustomField) Unmarshal(data []byte) error { return nil }
// Empty skip, it's for test usage only.
func (t testCustomField) Empty() bool { return false }
// UnmarshalTo skip, it's for test usage only.
func (t testCustomField) MarshalTo(data []byte) (int, error) { return 0, nil }
// Marshal skip, it's for test usage only.
func (t testCustomField) Marshal() ([]byte, error) { return nil, nil }