frostfs-sdk-go/bearer/bearer.go

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package bearer
import (
"crypto/ecdsa"
"errors"
"fmt"
"github.com/nspcc-dev/neofs-api-go/v2/acl"
"github.com/nspcc-dev/neofs-api-go/v2/refs"
cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
neofscrypto "github.com/nspcc-dev/neofs-sdk-go/crypto"
neofsecdsa "github.com/nspcc-dev/neofs-sdk-go/crypto/ecdsa"
"github.com/nspcc-dev/neofs-sdk-go/eacl"
"github.com/nspcc-dev/neofs-sdk-go/user"
)
// Token represents bearer token for object service operations.
//
// Token is mutually compatible with github.com/nspcc-dev/neofs-api-go/v2/acl.BearerToken
// message. See ReadFromV2 / WriteToV2 methods.
//
// Instances can be created using built-in var declaration.
type Token struct {
targetUserSet bool
targetUser user.ID
eaclTableSet bool
eaclTable eacl.Table
lifetimeSet bool
iat, nbf, exp uint64
sigSet bool
sig refs.Signature
}
// reads Token from the acl.BearerToken message. If checkFieldPresence is set,
// returns an error on absence of any protocol-required field.
func (b *Token) readFromV2(m acl.BearerToken, checkFieldPresence bool) error {
var err error
body := m.GetBody()
if checkFieldPresence && body == nil {
return errors.New("missing token body")
}
eaclTable := body.GetEACL()
if b.eaclTableSet = eaclTable != nil; b.eaclTableSet {
b.eaclTable = *eacl.NewTableFromV2(eaclTable)
} else if checkFieldPresence {
return errors.New("missing eACL table")
}
targetUser := body.GetOwnerID()
if b.targetUserSet = targetUser != nil; b.targetUserSet {
err = b.targetUser.ReadFromV2(*targetUser)
if err != nil {
return fmt.Errorf("invalid target user: %w", err)
}
}
lifetime := body.GetLifetime()
if b.lifetimeSet = lifetime != nil; b.lifetimeSet {
b.iat = lifetime.GetIat()
b.nbf = lifetime.GetNbf()
b.exp = lifetime.GetExp()
} else if checkFieldPresence {
return errors.New("missing token lifetime")
}
sig := m.GetSignature()
if b.sigSet = sig != nil; sig != nil {
b.sig = *sig
} else if checkFieldPresence {
return errors.New("missing body signature")
}
return nil
}
// ReadFromV2 reads Token from the acl.BearerToken message.
//
// See also WriteToV2.
func (b *Token) ReadFromV2(m acl.BearerToken) error {
return b.readFromV2(m, true)
}
func (b Token) fillBody() *acl.BearerTokenBody {
if !b.eaclTableSet && !b.targetUserSet && !b.lifetimeSet {
return nil
}
var body acl.BearerTokenBody
if b.eaclTableSet {
body.SetEACL(b.eaclTable.ToV2())
}
if b.targetUserSet {
var targetUser refs.OwnerID
b.targetUser.WriteToV2(&targetUser)
body.SetOwnerID(&targetUser)
}
if b.lifetimeSet {
var lifetime acl.TokenLifetime
lifetime.SetIat(b.iat)
lifetime.SetNbf(b.nbf)
lifetime.SetExp(b.exp)
body.SetLifetime(&lifetime)
}
return &body
}
func (b Token) signedData() []byte {
return b.fillBody().StableMarshal(nil)
}
// WriteToV2 writes Token to the acl.BearerToken message.
// The message must not be nil.
//
// See also ReadFromV2.
func (b Token) WriteToV2(m *acl.BearerToken) {
m.SetBody(b.fillBody())
var sig *refs.Signature
if b.sigSet {
sig = &b.sig
}
m.SetSignature(sig)
}
// SetExp sets "exp" (expiration time) claim which identifies the
// expiration time (in NeoFS epochs) on or after which the Token MUST NOT be
// accepted for processing. The processing of the "exp" claim requires that the
// current epoch MUST be before the expiration epoch listed in the "exp" claim.
//
// Naming is inspired by https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.4.
//
// See also InvalidAt.
func (b *Token) SetExp(exp uint64) {
b.exp = exp
b.lifetimeSet = true
}
// SetNbf sets "nbf" (not before) claim which identifies the time (in
// NeoFS epochs) before which the Token MUST NOT be accepted for processing. The
// processing of the "nbf" claim requires that the current epoch MUST be
// after or equal to the not-before epoch listed in the "nbf" claim.
//
// Naming is inspired by https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.5.
//
// See also InvalidAt.
func (b *Token) SetNbf(nbf uint64) {
b.nbf = nbf
b.lifetimeSet = true
}
// SetIat sets "iat" (issued at) claim which identifies the time (in NeoFS
// epochs) at which the Token was issued. This claim can be used to determine
// the age of the Token.
//
// Naming is inspired by https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.6.
//
// See also InvalidAt.
func (b *Token) SetIat(iat uint64) {
b.iat = iat
b.lifetimeSet = true
}
// InvalidAt asserts "exp", "nbf" and "iat" claims for the given epoch.
//
// Zero Container is invalid in any epoch.
//
// See also SetExp, SetNbf, SetIat.
func (b Token) InvalidAt(epoch uint64) bool {
return !b.lifetimeSet || b.nbf > epoch || b.iat > epoch || b.exp <= epoch
}
// SetEACLTable sets eacl.Table that replaces the one from the issuer's
// container. If table has specified container, bearer token can be used only
// for operations within this specific container. Otherwise, Token can be used
// within any issuer's container.
//
// SetEACLTable MUST be called if Token is going to be transmitted over
// NeoFS API V2 protocol.
//
// See also EACLTable, AssertContainer.
func (b *Token) SetEACLTable(table eacl.Table) {
b.eaclTable = table
b.eaclTableSet = true
}
// EACLTable returns extended ACL table set by SetEACLTable.
//
// Zero Token has zero eacl.Table.
func (b Token) EACLTable() eacl.Table {
if b.eaclTableSet {
return b.eaclTable
}
return eacl.Table{}
}
// AssertContainer checks if the token is valid within the given container.
//
// Note: cnr is assumed to refer to the issuer's container, otherwise the check
// is meaningless.
//
// Zero Token is valid in any container.
//
// See also SetEACLTable.
func (b Token) AssertContainer(cnr cid.ID) bool {
if !b.eaclTableSet {
return true
}
cnrTable, set := b.eaclTable.CID()
return !set || cnrTable.Equals(cnr)
}
// ForUser specifies ID of the user who can use the Token for the operations
// within issuer's container(s).
//
// Optional: by default, any user has access to Token usage.
//
// See also AssertUser.
func (b *Token) ForUser(id user.ID) {
b.targetUser = id
b.targetUserSet = true
}
// AssertUser checks if the Token is issued to the given user.
//
// Zero Token is available to any user.
//
// See also ForUser.
func (b Token) AssertUser(id user.ID) bool {
return !b.targetUserSet || b.targetUser.Equals(id)
}
// Sign calculates and writes signature of the Token data using issuer's secret.
// Returns signature calculation errors.
//
// Sign MUST be called if Token is going to be transmitted over
// NeoFS API V2 protocol.
//
// Note that any Token mutation is likely to break the signature, so it is
// expected to be calculated as a final stage of Token formation.
//
// See also VerifySignature, Issuer.
func (b *Token) Sign(key ecdsa.PrivateKey) error {
var sig neofscrypto.Signature
err := sig.Calculate(neofsecdsa.Signer(key), b.signedData())
if err != nil {
return err
}
sig.WriteToV2(&b.sig)
b.sigSet = true
return nil
}
// VerifySignature checks if Token signature is presented and valid.
//
// Zero Token fails the check.
//
// See also Sign.
func (b Token) VerifySignature() bool {
if !b.sigSet {
return false
}
var sig neofscrypto.Signature
// TODO: (#233) check owner<->key relation
return sig.ReadFromV2(b.sig) == nil && sig.Verify(b.signedData())
}
// Marshal encodes Token into a binary format of the NeoFS API protocol
// (Protocol Buffers V3 with direct field order).
//
// See also Unmarshal.
func (b Token) Marshal() []byte {
var m acl.BearerToken
b.WriteToV2(&m)
return m.StableMarshal(nil)
}
// Unmarshal decodes NeoFS API protocol binary data into the Token
// (Protocol Buffers V3 with direct field order). Returns an error describing
// a format violation.
//
// See also Marshal.
func (b *Token) Unmarshal(data []byte) error {
var m acl.BearerToken
err := m.Unmarshal(data)
if err != nil {
return err
}
return b.readFromV2(m, false)
}
// MarshalJSON encodes Token into a JSON format of the NeoFS API protocol
// (Protocol Buffers V3 JSON).
//
// See also UnmarshalJSON.
func (b Token) MarshalJSON() ([]byte, error) {
var m acl.BearerToken
b.WriteToV2(&m)
return m.MarshalJSON()
}
// UnmarshalJSON decodes NeoFS API protocol JSON data into the Token
// (Protocol Buffers V3 JSON). Returns an error describing a format violation.
//
// See also MarshalJSON.
func (b *Token) UnmarshalJSON(data []byte) error {
var m acl.BearerToken
err := m.UnmarshalJSON(data)
if err != nil {
return err
}
return b.readFromV2(m, false)
}
// SigningKeyBytes returns issuer's public key in a binary format of
// NeoFS API protocol.
//
// Unsigned Token has empty key.
//
// See also ResolveIssuer.
func (b Token) SigningKeyBytes() []byte {
if b.sigSet {
return b.sig.GetKey()
}
return nil
}
// ResolveIssuer resolves issuer's user.ID from the key used for Token signing.
// Returns zero user.ID if Token is unsigned or key has incorrect format.
//
// See also SigningKeyBytes.
func ResolveIssuer(b Token) (usr user.ID) {
binKey := b.SigningKeyBytes()
if len(binKey) != 0 {
var key neofsecdsa.PublicKey
if key.Decode(binKey) == nil {
user.IDFromKey(&usr, ecdsa.PublicKey(key))
}
}
return
}