frostfs-s3-gw/auth/center.go
Pavel Korotkov 0528eed7b6 [#19] Bug with AccessKey
Closes #19.

Signed-off-by: Pavel Korotkov <pkorotkov@gmail.com>
2020-08-19 16:28:17 +03:00

166 lines
5.3 KiB
Go

package auth
import (
"bytes"
"context"
"crypto/ecdsa"
"fmt"
"io/ioutil"
"net/http"
"regexp"
"strings"
"time"
aws_credentials "github.com/aws/aws-sdk-go/aws/credentials"
v4 "github.com/aws/aws-sdk-go/aws/signer/v4"
"github.com/nspcc-dev/neofs-api-go/refs"
"github.com/nspcc-dev/neofs-api-go/service"
"github.com/nspcc-dev/neofs-authmate/accessbox/hcs"
"github.com/nspcc-dev/neofs-authmate/credentials"
"github.com/nspcc-dev/neofs-authmate/gates"
manager "github.com/nspcc-dev/neofs-authmate/neofsmanager"
"github.com/pkg/errors"
"go.uber.org/zap"
)
var authorizationFieldRegexp = regexp.MustCompile(`AWS4-HMAC-SHA256 Credential=(?P<access_key_id_cid>[^/]+)/(?P<access_key_id_oid>[^/]+)/(?P<date>[^/]+)/(?P<region>[^/]*)/(?P<service>[^/]+)/aws4_request,\s*SignedHeaders=(?P<signed_header_fields>.+),\s*Signature=(?P<v4_signature>.+)`)
const emptyStringSHA256 = `e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855`
// Center is a central app's authentication/authorization management unit.
type Center struct {
log *zap.Logger
submatcher *regexpSubmatcher
neofsCredentials *credentials.Credentials
manager *manager.Manager
authKeys *hcs.X25519Keys
}
// NewCenter creates an instance of AuthCenter.
func NewCenter(log *zap.Logger, neofsNodeAddress string) (*Center, error) {
m, err := manager.NewManager(neofsNodeAddress)
if err != nil {
return nil, err
}
return &Center{
log: log,
submatcher: &regexpSubmatcher{re: authorizationFieldRegexp},
manager: m,
}, nil
}
func (center *Center) SetNeoFSKeys(key *ecdsa.PrivateKey) error {
creds, err := credentials.NewFromKey(key)
if err != nil {
return err
}
center.neofsCredentials = creds
return nil
}
func (center *Center) GetNeoFSPrivateKey() *ecdsa.PrivateKey {
return center.neofsCredentials.Key()
}
func (center *Center) GetOwnerID() refs.OwnerID {
return center.neofsCredentials.OwnerID()
}
func (center *Center) SetAuthKeys(key hcs.X25519PrivateKey) error {
keys, err := hcs.NewKeys(key)
if err != nil {
return err
}
center.authKeys = keys
return nil
}
func (center *Center) AuthenticationPassed(request *http.Request) (*service.BearerTokenMsg, error) {
queryValues := request.URL.Query()
if queryValues.Get("X-Amz-Algorithm") == "AWS4-HMAC-SHA256" {
return nil, errors.New("pre-signed form of request is not supported")
}
authHeaderField := request.Header["Authorization"]
if len(authHeaderField) != 1 {
return nil, errors.New("unsupported request: wrong length of Authorization header field")
}
sms1 := center.submatcher.getSubmatches(authHeaderField[0])
if len(sms1) != 7 {
return nil, errors.New("bad Authorization header field")
}
signedHeaderFieldsNames := strings.Split(sms1["signed_header_fields"], ";")
if len(signedHeaderFieldsNames) == 0 {
return nil, errors.New("wrong format of signed headers part")
}
signatureDateTime, err := time.Parse("20060102T150405Z", request.Header.Get("X-Amz-Date"))
if err != nil {
return nil, errors.Wrap(err, "failed to parse x-amz-date header field")
}
accessKeyID := fmt.Sprintf("%s/%s", sms1["access_key_id_cid"], sms1["access_key_id_oid"])
bearerToken, secretAccessKey, err := center.fetchBearerToken(accessKeyID)
if err != nil {
return nil, errors.Wrap(err, "failed to fetch bearer token")
}
otherRequest := request.Clone(context.TODO())
otherRequest.Header = map[string][]string{}
for hfn, hfvs := range request.Header {
for _, shfn := range signedHeaderFieldsNames {
if strings.EqualFold(hfn, shfn) {
otherRequest.Header[hfn] = hfvs
}
}
}
awsCreds := aws_credentials.NewStaticCredentials(accessKeyID, secretAccessKey, "")
signer := v4.NewSigner(awsCreds)
body, err := readAndKeepBody(request)
if err != nil {
return nil, errors.Wrap(err, "failed to read out request body")
}
_, err = signer.Sign(otherRequest, body, sms1["service"], sms1["region"], signatureDateTime)
if err != nil {
return nil, errors.Wrap(err, "failed to sign temporary HTTP request")
}
sms2 := center.submatcher.getSubmatches(otherRequest.Header.Get("Authorization"))
if sms1["v4_signature"] != sms2["v4_signature"] {
return nil, errors.Wrap(err, "failed to pass authentication procedure")
}
return bearerToken, nil
}
func (center *Center) fetchBearerToken(accessKeyID string) (*service.BearerTokenMsg, string, error) {
akid := new(refs.Address)
if err := akid.Parse(accessKeyID); err != nil {
return nil, "", errors.Wrap(err, "failed to parse access key id as refs.Address")
}
config := &gates.ObtainingConfig{
BaseConfig: gates.BaseConfig{
OperationalCredentials: center.neofsCredentials,
Manager: center.manager,
},
GateKeys: center.authKeys,
SecretAddress: akid,
}
res, err := gates.ObtainSecret(config)
if err != nil {
return nil, "", errors.Wrap(err, "failed to obtain secret")
}
return res.BearerToken, res.SecretAccessKey, nil
}
// TODO: Make this write into a smart buffer backed by a file on a fast drive.
func readAndKeepBody(request *http.Request) (*bytes.Reader, error) {
if request.Body == nil {
var r bytes.Reader
return &r, nil
}
payload, err := ioutil.ReadAll(request.Body)
if err != nil {
return nil, err
}
request.Body = ioutil.NopCloser(bytes.NewReader(payload))
return bytes.NewReader(payload), nil
}
func LoadGateAuthPrivateKey(path string) (hcs.X25519PrivateKey, error) {
return ioutil.ReadFile(path)
}