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classifier.go
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/
classifier.go
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package acl
import (
"bytes"
"crypto/ecdsa"
"github.com/nspcc-dev/neofs-api-go/pkg"
acl "github.com/nspcc-dev/neofs-api-go/pkg/acl/eacl"
"github.com/nspcc-dev/neofs-api-go/pkg/container"
"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
"github.com/nspcc-dev/neofs-api-go/pkg/owner"
"github.com/nspcc-dev/neofs-api-go/util/signature"
bearer "github.com/nspcc-dev/neofs-api-go/v2/acl"
"github.com/nspcc-dev/neofs-api-go/v2/session"
v2signature "github.com/nspcc-dev/neofs-api-go/v2/signature"
crypto "github.com/nspcc-dev/neofs-crypto"
core "github.com/nspcc-dev/neofs-node/pkg/core/netmap"
"github.com/pkg/errors"
)
type (
InnerRingFetcher interface {
InnerRingKeys() ([][]byte, error)
}
metaWithToken struct {
vheader *session.RequestVerificationHeader
token *session.SessionToken
bearer *bearer.BearerToken
}
SenderClassifier struct {
innerRing InnerRingFetcher
netmap core.Source
}
)
// fixme: update classifier constructor
func NewSenderClassifier(ir InnerRingFetcher, nm core.Source) SenderClassifier {
return SenderClassifier{
innerRing: ir,
netmap: nm,
}
}
func (c SenderClassifier) Classify(
req metaWithToken,
cid *container.ID,
cnr *container.Container) (acl.Role, []byte, error) {
if cid == nil {
return 0, nil, errors.Wrap(ErrMalformedRequest, "container id is not set")
}
ownerID, ownerKey, err := requestOwner(req)
if err != nil {
return 0, nil, err
}
ownerKeyInBytes := crypto.MarshalPublicKey(ownerKey)
// todo: get owner from neofs.id if present
// if request owner is the same as container owner, return RoleUser
if bytes.Equal(cnr.OwnerID().ToV2().GetValue(), ownerID.ToV2().GetValue()) {
return acl.RoleUser, ownerKeyInBytes, nil
}
isInnerRingNode, err := c.isInnerRingKey(ownerKeyInBytes)
if err != nil {
return 0, nil, errors.Wrap(err, "can't check if request from inner ring")
} else if isInnerRingNode {
return acl.RoleSystem, ownerKeyInBytes, nil
}
isContainerNode, err := c.isContainerKey(ownerKeyInBytes, cid.ToV2().GetValue(), cnr)
if err != nil {
return 0, nil, errors.Wrap(err, "can't check if request from container node")
} else if isContainerNode {
return acl.RoleSystem, ownerKeyInBytes, nil
}
// if none of above, return RoleOthers
return acl.RoleOthers, ownerKeyInBytes, nil
}
func requestOwner(req metaWithToken) (*owner.ID, *ecdsa.PublicKey, error) {
if req.vheader == nil {
return nil, nil, errors.Wrap(ErrMalformedRequest, "nil verification header")
}
// if session token is presented, use it as truth source
if req.token.GetBody() != nil {
// verify signature of session token
return ownerFromToken(req.token)
}
// otherwise get original body signature
bodySignature := originalBodySignature(req.vheader)
if bodySignature == nil {
return nil, nil, errors.Wrap(ErrMalformedRequest, "nil at body signature")
}
key := crypto.UnmarshalPublicKey(bodySignature.Key())
neo3wallet, err := owner.NEO3WalletFromPublicKey(key)
if err != nil {
return nil, nil, errors.Wrap(err, "can't create neo3 wallet")
}
// form user from public key
user := new(owner.ID)
user.SetNeo3Wallet(neo3wallet)
return user, key, nil
}
func originalBodySignature(v *session.RequestVerificationHeader) *pkg.Signature {
if v == nil {
return nil
}
for v.GetOrigin() != nil {
v = v.GetOrigin()
}
return pkg.NewSignatureFromV2(v.GetBodySignature())
}
func (c SenderClassifier) isInnerRingKey(owner []byte) (bool, error) {
innerRingKeys, err := c.innerRing.InnerRingKeys()
if err != nil {
return false, err
}
// if request owner key in the inner ring list, return RoleSystem
for i := range innerRingKeys {
if bytes.Equal(innerRingKeys[i], owner) {
return true, nil
}
}
return false, nil
}
func (c SenderClassifier) isContainerKey(
owner, cid []byte,
cnr *container.Container) (bool, error) {
// first check current netmap
nm, err := core.GetLatestNetworkMap(c.netmap)
if err != nil {
return false, err
}
in, err := lookupKeyInContainer(nm, owner, cid, cnr)
if err != nil {
return false, err
} else if in {
return true, nil
}
// then check previous netmap, this can happen in-between epoch change
// when node migrates data from last epoch container
nm, err = core.GetPreviousNetworkMap(c.netmap)
if err != nil {
return false, err
}
return lookupKeyInContainer(nm, owner, cid, cnr)
}
func lookupKeyInContainer(
nm *netmap.Netmap,
owner, cid []byte,
cnr *container.Container) (bool, error) {
cnrNodes, err := nm.GetContainerNodes(cnr.PlacementPolicy(), cid)
if err != nil {
return false, err
}
flatCnrNodes := cnrNodes.Flatten() // we need single array to iterate on
for i := range flatCnrNodes {
if bytes.Equal(flatCnrNodes[i].PublicKey(), owner) {
return true, nil
}
}
return false, nil
}
func ownerFromToken(token *session.SessionToken) (*owner.ID, *ecdsa.PublicKey, error) {
// 1. First check signature of session token.
signWrapper := v2signature.StableMarshalerWrapper{SM: token.GetBody()}
if err := signature.VerifyDataWithSource(signWrapper, func() (key, sig []byte) {
tokenSignature := token.GetSignature()
return tokenSignature.GetKey(), tokenSignature.GetSign()
}); err != nil {
return nil, nil, errors.Wrap(ErrMalformedRequest, "invalid session token signature")
}
// 2. Then check if session token owner issued the session token
tokenIssuerKey := crypto.UnmarshalPublicKey(token.GetSignature().GetKey())
tokenIssuerWallet, err := owner.NEO3WalletFromPublicKey(tokenIssuerKey)
if err != nil {
return nil, nil, errors.Wrap(ErrMalformedRequest, "invalid token issuer key")
}
if !bytes.Equal(token.GetBody().GetOwnerID().GetValue(), tokenIssuerWallet.Bytes()) {
// todo: in this case we can issue all owner keys from neofs.id and check once again
return nil, nil, errors.Wrap(ErrMalformedRequest, "invalid session token owner")
}
return owner.NewIDFromV2(token.GetBody().GetOwnerID()), tokenIssuerKey, nil
}