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request_context.go
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request_context.go
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package gater
import (
"context"
"encoding/hex"
"fmt"
"net/http"
"strings"
"time"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/crypto/secp256k1"
"github.com/gorilla/mux"
"golang.org/x/exp/slices"
commonhash "github.com/bnb-chain/greenfield-common/go/hash"
commonhttp "github.com/bnb-chain/greenfield-common/go/http"
"github.com/bnb-chain/greenfield-storage-provider/pkg/log"
)
// RequestContext generates from http request, it records the common info
// for handler to use.
type RequestContext struct {
g *GateModular
request *http.Request
routerName string
bucketName string
objectName string
account string // account is used to provide authentication to the sp
vars map[string]string
httpCode int
// ctx is the runtime context for the request
ctx context.Context
// the cancel func of ctx, it should be called at the end of the request
// to make sure the connection to the back server is released.
cancel func()
err error
startTime time.Time
}
var skipAuthRouterNames = []string{
requestNonceRouterName,
updateUserPublicKeyRouterName, // this will skip general auth algorithms first and use specific "personal sign" later
downloadObjectByUniversalEndpointName,
viewObjectByUniversalEndpointName,
getUserBucketsRouterName,
listObjectsByBucketRouterName,
getObjectMetaRouterName,
getBucketMetaRouterName,
listBucketsByIDsRouterName,
listObjectsByIDsRouterName,
}
// NewRequestContext returns an instance of RequestContext, and verify the
// request signature, returns the instance regardless of the success or
// failure of the verification.
func NewRequestContext(r *http.Request, g *GateModular) (*RequestContext, error) {
vars := mux.Vars(r)
routerName := ""
if mux.CurrentRoute(r) != nil {
routerName = mux.CurrentRoute(r).GetName()
}
ctx, cancel := context.WithCancel(context.Background())
reqCtx := &RequestContext{
g: g,
ctx: ctx,
cancel: cancel,
request: r,
routerName: routerName,
bucketName: vars["bucket"],
objectName: vars["object"],
account: vars["account_id"],
vars: vars,
startTime: time.Now(),
}
if slices.Contains(skipAuthRouterNames, routerName) {
return reqCtx, nil
}
err := reqCtx.CheckIfSigExpiry()
if err != nil {
return reqCtx, err
}
account, err := reqCtx.VerifySignature()
if err != nil {
return reqCtx, err
}
reqCtx.account = account
return reqCtx, nil
}
// Context returns the RequestContext runtime context.
func (r *RequestContext) Context() context.Context {
return r.ctx
}
// Account returns the account who send the request.
func (r *RequestContext) Account() string {
return r.account
}
// Cancel releases the runtime context.
func (r *RequestContext) Cancel() {
r.cancel()
}
// SetHTTPCode sets the http status code for logging and debugging.
func (r *RequestContext) SetHTTPCode(code int) {
r.httpCode = code
}
// SetError sets the request err to RequestContext for logging and debugging.
func (r *RequestContext) SetError(err error) {
r.err = err
}
// String shows the detail result of the request for logging and debugging.
func (r *RequestContext) String() string {
var headerToString = func(header http.Header) string {
var sb = strings.Builder{}
for k := range header {
if k == GnfdUnsignedApprovalMsgHeader || k == GnfdReplicatePieceApprovalHeader || k == GnfdReceiveMsgHeader ||
k == GnfdRecoveryMsgHeader || k == GnfdMigratePieceMsgHeader || k == commonhttp.HTTPHeaderAuthorization {
continue
}
if sb.Len() != 0 {
sb.WriteString(",")
}
sb.WriteString(fmt.Sprintf("%v:[%v]", k, header.Get(k)))
}
return "{" + sb.String() + "}"
}
var getRequestIP = func(r *http.Request) string {
IPAddress := r.Header.Get("X-Real-Ip")
if IPAddress == "" {
IPAddress = r.Header.Get("X-Forwarded-For")
}
if IPAddress == "" {
IPAddress = r.RemoteAddr
}
if ok := strings.Contains(IPAddress, ":"); ok {
IPAddress = strings.Split(IPAddress, ":")[0]
}
return IPAddress
}
return fmt.Sprintf("HttpStatusCode[%d] action[%s] host[%v] method[%v] url[%v] header[%v] remote[%v] cost[%v] error[%v]",
r.httpCode, r.routerName, r.request.Host, r.request.Method, r.request.URL.String(), headerToString(r.request.Header),
getRequestIP(r.request), time.Since(r.startTime), r.err)
}
func (r *RequestContext) VerifySignature() (string, error) {
// check sig
requestSignature := r.request.Header.Get(GnfdAuthorizationHeader)
// GNFD1-ECDSA
gnfd1EcdsaSignaturePrefix := commonhttp.Gnfd1Ecdsa + ","
if strings.HasPrefix(requestSignature, gnfd1EcdsaSignaturePrefix) {
accAddress, err := r.verifySignatureForGNFD1Ecdsa(requestSignature[len(gnfd1EcdsaSignaturePrefix):])
if err != nil {
return "", err
}
return accAddress.String(), nil
}
// GNFD1-EDDSA
gnfd1EddsaSignaturePrefix := commonhttp.Gnfd1Eddsa + ","
if strings.HasPrefix(requestSignature, gnfd1EddsaSignaturePrefix) {
accAddress, err := r.verifySignatureForGNFD1Eddsa(requestSignature[len(gnfd1EddsaSignaturePrefix):])
if err != nil {
return "", err
}
return accAddress.String(), nil
}
return "", ErrUnsupportedSignType
}
func (r *RequestContext) CheckIfSigExpiry() error {
// check expiry header
requestExpiredTimestamp := r.request.Header.Get(commonhttp.HTTPHeaderExpiryTimestamp)
if requestExpiredTimestamp == "" {
requestExpiredTimestamp = r.request.URL.Query().Get(commonhttp.HTTPHeaderExpiryTimestamp)
}
expiryDate, parseErr := time.Parse(ExpiryDateFormat, requestExpiredTimestamp)
if parseErr != nil {
return ErrInvalidExpiryDateHeader
}
expiryAge := int32(time.Until(expiryDate).Seconds())
if MaxExpiryAgeInSec < expiryAge || expiryAge < 0 {
return ErrInvalidExpiryDateHeader
}
return nil
}
// verifySignatureForGNFD1Ecdsa used to verify request type GNFD1_ECDSA, return (address, nil) if check succeed
func (r *RequestContext) verifySignatureForGNFD1Ecdsa(requestSignature string) (sdk.AccAddress, error) {
var (
signature []byte
err error
)
sigStr, err := parseSignatureFromRequest(requestSignature)
if err != nil {
return nil, err
}
if signature, err = hex.DecodeString(sigStr); err != nil {
return nil, err
}
// check request integrity
realMsgToSign := commonhttp.GetMsgToSignInGNFD1Auth(r.request)
// check signature consistent
addr, _, err := commonhash.RecoverAddr(realMsgToSign, signature)
if err != nil {
log.CtxError(r.ctx, "failed to recover address")
return nil, ErrRequestConsistent
}
return addr, nil
}
// verifyTaskSignature verify the task signature and return the sender address
func (r *RequestContext) verifyTaskSignature(taskMsgBytes []byte, taskSignature []byte) (sdk.AccAddress, error) {
if len(taskMsgBytes) != 32 {
taskMsgBytes = crypto.Keccak256(taskMsgBytes)
}
addr, pk, err := commonhash.RecoverAddr(taskMsgBytes, taskSignature)
if err != nil {
log.CtxErrorw(r.Context(), "failed to recover address", "error", err)
return nil, err
}
if !secp256k1.VerifySignature(pk.Bytes(), taskMsgBytes, taskSignature[:len(taskSignature)-1]) {
log.CtxError(r.ctx, "failed to verify task signature")
return nil, err
}
return addr, nil
}
// verifySignatureForGNFD1Eddsa used to verify off-chain-auth signature, return (address, nil) if check succeed
func (r *RequestContext) verifySignatureForGNFD1Eddsa(requestSignature string) (sdk.AccAddress, error) {
var err error
offChainSig, err := parseSignatureFromRequest(requestSignature)
if err != nil {
return nil, err
}
// check request integrity
realMsgToSign := commonhttp.GetMsgToSignInGNFD1Auth(r.request)
account := r.request.Header.Get(GnfdUserAddressHeader)
domain := r.request.Header.Get(GnfdOffChainAuthAppDomainHeader)
_, err = r.g.baseApp.GfSpClient().VerifyGNFD1EddsaSignature(r.Context(), account, domain, offChainSig, realMsgToSign)
if err != nil {
log.Errorw("failed to verify signature for GNFD1-Eddsa", "error", err)
return nil, err
} else {
userAddress, _ := sdk.AccAddressFromHexUnsafe(r.request.Header.Get(GnfdUserAddressHeader))
return userAddress, nil
}
}
// verifyOffChainSignatureFromPreSignedURL used to verify off-chain-auth signature, return (address, nil) if check succeed. The auth information will be parsed from URL.
func (r *RequestContext) verifyGNFD1EddsaSignatureFromPreSignedURL(authenticationStr string, account string, domain string) (sdk.AccAddress, error) {
var err error
offChainSig, err := parseSignatureFromRequest(authenticationStr)
if err != nil {
return nil, err
}
// check request integrity
realMsgToSign := commonhttp.GetMsgToSignInGNFD1AuthForPreSignedURL(r.request)
_, err = r.g.baseApp.GfSpClient().VerifyGNFD1EddsaSignature(r.Context(), account, domain, offChainSig, realMsgToSign)
if err != nil {
log.Errorw("failed to verify off chain signature", "error", err)
return nil, err
} else {
userAddress, _ := sdk.AccAddressFromHexUnsafe(account)
return userAddress, nil
}
}
// parseSignatureFromRequest get sig for both ECDSA and EDDSA auth, it expects the auth string should look like "Signature=xxxxx".
func parseSignatureFromRequest(requestSignature string) (string, error) {
var signature string
requestSignature = strings.ReplaceAll(requestSignature, " ", "")
pair := strings.Split(requestSignature, "=")
if len(pair) != 2 {
return "", ErrAuthorizationHeaderFormat
}
switch pair[0] {
case Signature:
signature = pair[1]
return signature, nil
default:
return "", ErrAuthorizationHeaderFormat
}
}