257 lines
7.8 KiB
Go
257 lines
7.8 KiB
Go
package auth
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import (
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"bytes"
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"context"
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"crypto/ecdsa"
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha256"
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"crypto/x509"
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"encoding/hex"
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"encoding/pem"
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"io/ioutil"
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"net/http"
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"regexp"
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"strings"
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"time"
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"github.com/aws/aws-sdk-go/aws/credentials"
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v4 "github.com/aws/aws-sdk-go/aws/signer/v4"
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"github.com/klauspost/compress/zstd"
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"github.com/nspcc-dev/neofs-api-go/refs"
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"github.com/nspcc-dev/neofs-api-go/service"
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crypto "github.com/nspcc-dev/neofs-crypto"
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"github.com/pkg/errors"
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"go.uber.org/zap"
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)
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const authorizationFieldPattern = `AWS4-HMAC-SHA256 Credential=(?P<access_key_id>[^/]+)/(?P<date>[^/]+)/(?P<region>[^/]*)/(?P<service>[^/]+)/aws4_request, SignedHeaders=(?P<signed_header_fields>.*), Signature=(?P<v4_signature>.*)`
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const emptyStringSHA256 = `e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855`
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// Center is a central app's authentication/authorization management unit.
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type Center struct {
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log *zap.Logger
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submatcher *regexpSubmatcher
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zstdEncoder *zstd.Encoder
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zstdDecoder *zstd.Decoder
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neofsKeys struct {
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PrivateKey *ecdsa.PrivateKey
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PublicKey *ecdsa.PublicKey
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}
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ownerID refs.OwnerID
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wifString string
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userAuthKeys struct {
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PrivateKey *rsa.PrivateKey
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PublicKey *rsa.PublicKey
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}
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}
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// NewCenter creates an instance of AuthCenter.
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func NewCenter(log *zap.Logger) *Center {
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zstdEncoder, _ := zstd.NewWriter(nil)
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zstdDecoder, _ := zstd.NewReader(nil)
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return &Center{
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log: log,
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submatcher: ®expSubmatcher{re: regexp.MustCompile(authorizationFieldPattern)},
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zstdEncoder: zstdEncoder,
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zstdDecoder: zstdDecoder,
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}
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}
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func (center *Center) SetNeoFSKeys(key *ecdsa.PrivateKey) error {
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publicKey := &key.PublicKey
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oid, err := refs.NewOwnerID(publicKey)
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if err != nil {
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return errors.Wrap(err, "failed to get OwnerID")
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}
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center.neofsKeys.PrivateKey = key
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wif, err := crypto.WIFEncode(key)
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if err != nil {
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return errors.Wrap(err, "failed to get WIF string from given key")
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}
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center.neofsKeys.PublicKey = publicKey
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center.ownerID = oid
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center.wifString = wif
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return nil
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}
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func (center *Center) GetNeoFSKeyPrivateKey() *ecdsa.PrivateKey {
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return center.neofsKeys.PrivateKey
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}
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func (center *Center) GetNeoFSKeyPublicKey() *ecdsa.PublicKey {
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return center.neofsKeys.PublicKey
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}
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func (center *Center) GetOwnerID() refs.OwnerID {
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return center.ownerID
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}
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func (center *Center) GetWIFString() string {
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return center.wifString
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}
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func (center *Center) SetUserAuthKeys(key *rsa.PrivateKey) {
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center.userAuthKeys.PrivateKey = key
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center.userAuthKeys.PublicKey = &key.PublicKey
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}
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func (center *Center) packBearerToken(bearerToken *service.BearerTokenMsg) (string, string, error) {
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data, err := bearerToken.Marshal()
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if err != nil {
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return "", "", errors.Wrap(err, "failed to marshal bearer token")
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}
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encryptedKeyID, err := encrypt(center.userAuthKeys.PublicKey, center.compress(data))
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if err != nil {
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return "", "", errors.Wrap(err, "failed to encrypt bearer token bytes")
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}
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accessKeyID := hex.EncodeToString(encryptedKeyID)
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secretAccessKey := hex.EncodeToString(sha256Hash(data))
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return accessKeyID, secretAccessKey, nil
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}
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func (center *Center) unpackBearerToken(accessKeyID string) (*service.BearerTokenMsg, string, error) {
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encryptedKeyID, err := hex.DecodeString(accessKeyID)
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if err != nil {
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return nil, "", errors.Wrap(err, "failed to decode HEX string")
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}
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compressedKeyID, err := decrypt(center.userAuthKeys.PrivateKey, encryptedKeyID)
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if err != nil {
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return nil, "", errors.Wrap(err, "failed to decrypt key ID")
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}
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data, err := center.decompress(compressedKeyID)
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if err != nil {
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return nil, "", errors.Wrap(err, "failed to decompress key ID")
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}
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bearerToken := new(service.BearerTokenMsg)
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if err := bearerToken.Unmarshal(data); err != nil {
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return nil, "", errors.Wrap(err, "failed to unmarshal embedded bearer token")
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}
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secretAccessKey := hex.EncodeToString(sha256Hash(data))
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return bearerToken, secretAccessKey, nil
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}
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func (center *Center) AuthenticationPassed(request *http.Request) (*service.BearerTokenMsg, error) {
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queryValues := request.URL.Query()
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if queryValues.Get("X-Amz-Algorithm") == "AWS4-HMAC-SHA256" {
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return nil, errors.New("pre-signed form of request is not supported")
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}
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authHeaderField := request.Header["Authorization"]
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if len(authHeaderField) != 1 {
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return nil, errors.New("unsupported request: wrong length of Authorization header field")
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}
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sms1 := center.submatcher.getSubmatches(authHeaderField[0])
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if len(sms1) != 6 {
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return nil, errors.New("bad Authorization header field")
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}
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signedHeaderFieldsNames := strings.Split(sms1["signed_header_fields"], ";")
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if len(signedHeaderFieldsNames) == 0 {
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return nil, errors.New("wrong format of signed headers part")
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}
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signatureDateTime, err := time.Parse("20060102T150405Z", request.Header.Get("X-Amz-Date"))
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if err != nil {
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// TODO
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}
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accessKeyID := sms1["access_key_id"]
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bearerToken, secretAccessKey, err := center.unpackBearerToken(accessKeyID)
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if err != nil {
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// FIXME: Should be `return nil, errors.Wrap(err, "failed to unpack bearer token")`
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center.log.Warn("Failed to unpack bearer token", zap.Error(err))
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return nil, nil
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}
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otherRequest := request.Clone(context.TODO())
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otherRequest.Header = map[string][]string{}
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for hfn, hfvs := range request.Header {
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for _, shfn := range signedHeaderFieldsNames {
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if strings.EqualFold(hfn, shfn) {
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otherRequest.Header[hfn] = hfvs
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}
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}
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}
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awsCreds := credentials.NewStaticCredentials(accessKeyID, secretAccessKey, "")
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signer := v4.NewSigner(awsCreds)
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body, err := readAndKeepBody(request)
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if err != nil {
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// TODO
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}
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_, err = signer.Sign(otherRequest, body, sms1["service"], sms1["region"], signatureDateTime)
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if err != nil {
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// TODO
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}
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sms2 := center.submatcher.getSubmatches(otherRequest.Header.Get("Authorization"))
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if sms1["v4_signature"] != sms2["v4_signature"] {
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// FIXME: Should be `return nil, errors.Wrap(err, "failed to pass authentication procedure")`
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center.log.Warn("Failed to pass authentication procedure")
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return nil, nil
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}
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return bearerToken, nil
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}
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func readAndKeepBody(request *http.Request) (*bytes.Reader, error) {
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if request.Body == nil {
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var r bytes.Reader
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return &r, nil
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}
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payload, err := ioutil.ReadAll(request.Body)
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if err != nil {
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return nil, err
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}
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request.Body = ioutil.NopCloser(bytes.NewReader(payload))
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return bytes.NewReader(payload), nil
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}
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func (center *Center) compress(data []byte) []byte {
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return center.zstdEncoder.EncodeAll(data, make([]byte, 0, len(data)))
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}
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func (center *Center) decompress(data []byte) ([]byte, error) {
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return center.zstdDecoder.DecodeAll(data, nil)
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}
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func encrypt(key *rsa.PublicKey, data []byte) ([]byte, error) {
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return rsa.EncryptOAEP(sha256.New(), rand.Reader, key, data, []byte{})
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}
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func decrypt(key *rsa.PrivateKey, data []byte) ([]byte, error) {
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return rsa.DecryptOAEP(sha256.New(), rand.Reader, key, data, []byte{})
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}
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func sha256Hash(data []byte) []byte {
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hash := sha256.New()
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hash.Write(data)
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return hash.Sum(nil)
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}
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func ReadRSAPrivateKeyFromPEMFile(filePath string) (*rsa.PrivateKey, error) {
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kbs, err := ioutil.ReadFile(filePath)
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if err != nil {
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return nil, errors.Wrapf(err, "failed to read file %s", filePath)
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}
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pemBlock, _ := pem.Decode(kbs)
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if pemBlock == nil {
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return nil, errors.Errorf("failed to decode PEM data from file %s", filePath)
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}
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rsaKey, err := x509.ParsePKCS1PrivateKey(pemBlock.Bytes)
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if err != nil {
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return nil, errors.Wrapf(err, "failed to parse private key bytes from pem data from file %s", filePath)
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}
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return rsaKey, nil
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}
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type regexpSubmatcher struct {
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re *regexp.Regexp
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}
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func (resm *regexpSubmatcher) getSubmatches(target string) map[string]string {
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matches := resm.re.FindStringSubmatch(target)
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l := len(matches)
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submatches := make(map[string]string, l)
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for i, name := range resm.re.SubexpNames() {
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if i > 0 && i <= l {
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submatches[name] = matches[i]
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}
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}
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return submatches
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}
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