package auth import ( "bytes" "crypto/ecdsa" "crypto/rand" "crypto/rsa" "crypto/sha256" "crypto/x509" "encoding/hex" "encoding/pem" "io/ioutil" "net/http" "regexp" "github.com/klauspost/compress/zstd" "github.com/nspcc-dev/neofs-api-go/refs" "github.com/nspcc-dev/neofs-api-go/service" crypto "github.com/nspcc-dev/neofs-crypto" "github.com/pkg/errors" "go.uber.org/zap" ) const authorizationFieldPattern = `AWS4-HMAC-SHA256 Credential=(?P[^/]+)/(?P[^/]+)/(?P[^/]*)/(?P[^/]+)/aws4_request, SignedHeaders=(?P.*), Signature=(?P.*)` const emptyStringSHA256 = `e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855` // Center is a central app's authentication/authorization management unit. type Center struct { log *zap.Logger submatcher *regexpSubmatcher zstdEncoder *zstd.Encoder zstdDecoder *zstd.Decoder neofsKeys struct { PrivateKey *ecdsa.PrivateKey PublicKey *ecdsa.PublicKey } ownerID refs.OwnerID wifString string userAuthKeys struct { PrivateKey *rsa.PrivateKey PublicKey *rsa.PublicKey } } // NewCenter creates an instance of AuthCenter. func NewCenter(log *zap.Logger) *Center { zstdEncoder, _ := zstd.NewWriter(nil) zstdDecoder, _ := zstd.NewReader(nil) return &Center{ log: log, submatcher: ®expSubmatcher{re: regexp.MustCompile(authorizationFieldPattern)}, zstdEncoder: zstdEncoder, zstdDecoder: zstdDecoder, } } func (center *Center) SetNeoFSKeys(key *ecdsa.PrivateKey) error { publicKey := &key.PublicKey oid, err := refs.NewOwnerID(publicKey) if err != nil { return errors.Wrap(err, "failed to get OwnerID") } center.neofsKeys.PrivateKey = key wif, err := crypto.WIFEncode(key) if err != nil { return errors.Wrap(err, "failed to get WIF string from given key") } center.neofsKeys.PublicKey = publicKey center.ownerID = oid center.wifString = wif return nil } func (center *Center) GetNeoFSKeyPrivateKey() *ecdsa.PrivateKey { return center.neofsKeys.PrivateKey } func (center *Center) GetNeoFSKeyPublicKey() *ecdsa.PublicKey { return center.neofsKeys.PublicKey } func (center *Center) GetOwnerID() refs.OwnerID { return center.ownerID } func (center *Center) GetWIFString() string { return center.wifString } func (center *Center) SetUserAuthKeys(key *rsa.PrivateKey) { center.userAuthKeys.PrivateKey = key center.userAuthKeys.PublicKey = &key.PublicKey } func (center *Center) packBearerToken(bearerToken *service.BearerTokenMsg) (string, string, error) { data, err := bearerToken.Marshal() if err != nil { return "", "", errors.Wrap(err, "failed to marshal bearer token") } encryptedKeyID, err := encrypt(center.userAuthKeys.PublicKey, center.compress(data)) if err != nil { return "", "", errors.Wrap(err, "failed to encrypt bearer token bytes") } accessKeyID := hex.EncodeToString(encryptedKeyID) secretAccessKey := hex.EncodeToString(sha256Hash(data)) return accessKeyID, secretAccessKey, nil } func (center *Center) unpackBearerToken(accessKeyID string) (*service.BearerTokenMsg, error) { encryptedKeyID, err := hex.DecodeString(accessKeyID) if err != nil { return nil, errors.Wrap(err, "failed to decode HEX string") } compressedKeyID, err := decrypt(center.userAuthKeys.PrivateKey, encryptedKeyID) if err != nil { return nil, errors.Wrap(err, "failed to decrypt key ID") } data, err := center.decompress(compressedKeyID) if err != nil { return nil, errors.Wrap(err, "failed to decompress key ID") } bearerToken := new(service.BearerTokenMsg) if err := bearerToken.Unmarshal(data); err != nil { return nil, errors.Wrap(err, "failed to unmarshal embedded bearer token") } return bearerToken, nil } func (center *Center) AuthenticationPassed(request *http.Request) (*service.BearerTokenMsg, error) { authHeaderField := request.Header["Authorization"] if len(authHeaderField) != 1 { return nil, errors.New("unsupported request: wrong length of Authorization header field") } sms := center.submatcher.getSubmatches(authHeaderField[0]) if len(sms) != 6 { return nil, errors.New("bad Authorization header field") } bt, err := center.unpackBearerToken(sms["access_key_id"]) if err != nil { center.log.Warn("Failed to unpack bearer token", zap.Error(err)) //return nil, errors.Wrap(err, "failed to unpack bearer token") } return bt, nil } func readAndReplaceBody(request *http.Request) []byte { if request.Body == nil { return []byte{} } payload, _ := ioutil.ReadAll(request.Body) request.Body = ioutil.NopCloser(bytes.NewReader(payload)) return payload } func (center *Center) compress(data []byte) []byte { return center.zstdEncoder.EncodeAll(data, make([]byte, 0, len(data))) } func (center *Center) decompress(data []byte) ([]byte, error) { return center.zstdDecoder.DecodeAll(data, nil) } func encrypt(key *rsa.PublicKey, data []byte) ([]byte, error) { return rsa.EncryptOAEP(sha256.New(), rand.Reader, key, data, []byte{}) } func decrypt(key *rsa.PrivateKey, data []byte) ([]byte, error) { return rsa.DecryptOAEP(sha256.New(), rand.Reader, key, data, []byte{}) } func sha256Hash(data []byte) []byte { hash := sha256.New() hash.Write(data) return hash.Sum(nil) } func ReadRSAPrivateKeyFromPEMFile(filePath string) (*rsa.PrivateKey, error) { kbs, err := ioutil.ReadFile(filePath) if err != nil { return nil, errors.Wrapf(err, "failed to read file %s", filePath) } pemBlock, _ := pem.Decode(kbs) if pemBlock == nil { return nil, errors.Errorf("failed to decode PEM data from file %s", filePath) } rsaKey, err := x509.ParsePKCS1PrivateKey(pemBlock.Bytes) if err != nil { return nil, errors.Wrapf(err, "failed to parse private key bytes from pem data from file %s", filePath) } return rsaKey, nil } type regexpSubmatcher struct { re *regexp.Regexp } func (resm *regexpSubmatcher) getSubmatches(target string) map[string]string { matches := resm.re.FindStringSubmatch(target) l := len(matches) submatches := make(map[string]string, l) for i, name := range resm.re.SubexpNames() { if i > 0 && i <= l { submatches[name] = matches[i] } } return submatches }