[#306] private: Implement server of gRPC private node service

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
This commit is contained in:
Leonard Lyubich 2021-01-13 15:49:46 +03:00 committed by Alex Vanin
parent e75ddb0549
commit c1b8a4815f
3 changed files with 142 additions and 0 deletions

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package private
import (
"context"
"github.com/nspcc-dev/neofs-node/pkg/services/private"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// HealthCheck returns health status of the local node.
//
// If request is unsigned or signed by disallowed key, permission error returns.
func (s *Server) HealthCheck(_ context.Context, req *private.HealthCheckRequest) (*private.HealthCheckResponse, error) {
// verify request
if err := s.isValidRequest(req); err != nil {
return nil, status.Error(codes.PermissionDenied, err.Error())
}
// create and fill response
resp := new(private.HealthCheckResponse)
body := new(private.HealthCheckResponse_Body)
resp.SetBody(body)
// FIXME: calculate the status
body.SetStatus(private.HealthStatus_ONLINE)
// sign the response
if err := SignMessage(s.key, resp); err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
return resp, nil
}

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package private
import (
"crypto/ecdsa"
)
// Server is an entity that serves
// Private service on storage node.
type Server struct {
*cfg
}
// Option of the Server's constructor.
type Option func(*cfg)
type cfg struct {
key *ecdsa.PrivateKey
allowedKeys [][]byte
}
func defaultCfg() *cfg {
return &cfg{}
}
// New creates, initializes and returns new Server instance.
func New(opts ...Option) *Server {
c := defaultCfg()
for _, opt := range opts {
opt(c)
}
return &Server{
cfg: c,
}
}
// WithKey returns option to set private key
// used for signing responses.
func WithKey(key *ecdsa.PrivateKey) Option {
return func(c *cfg) {
c.key = key
}
}
// WithAllowedKeys returns option to add list of public
// keys that have rights to use private service.
func WithAllowedKeys(keys [][]byte) Option {
return func(c *cfg) {
c.allowedKeys = append(c.allowedKeys, keys...)
}
}

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package private
import (
"bytes"
"crypto/ecdsa"
"errors"
"github.com/nspcc-dev/neofs-api-go/util/signature"
"github.com/nspcc-dev/neofs-node/pkg/services/private"
)
// SignedMessage is an interface of Private service message.
type SignedMessage interface {
signature.DataSource
GetSignature() *private.Signature
SetSignature(*private.Signature)
}
var errDisallowedKey = errors.New("key is not in the allowed list")
func (s *Server) isValidRequest(req SignedMessage) error {
var (
sign = req.GetSignature()
key = sign.GetKey()
allowed = false
)
// check if key is allowed
for i := range s.allowedKeys {
if allowed = bytes.Equal(s.allowedKeys[i], key); allowed {
break
}
}
if !allowed {
return errDisallowedKey
}
// verify signature
return signature.VerifyDataWithSource(req, func() ([]byte, []byte) {
return key, sign.GetSign()
})
}
// SignMessage signs Private service message with private key.
func SignMessage(key *ecdsa.PrivateKey, msg SignedMessage) error {
return signature.SignDataWithHandler(key, msg, func(key []byte, sig []byte) {
s := new(private.Signature)
s.SetKey(key)
s.SetSign(sig)
msg.SetSignature(s)
})
}