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validation.go
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validation.go
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// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.
package metainfo
import (
"bytes"
"context"
"crypto/subtle"
"regexp"
"time"
"github.com/zeebo/errs"
"go.uber.org/zap"
"golang.org/x/time/rate"
"storj.io/common/encryption"
"storj.io/common/macaroon"
"storj.io/common/pb"
"storj.io/common/rpc/rpcstatus"
"storj.io/common/storj"
"storj.io/common/uuid"
"storj.io/storj/satellite/console"
"storj.io/storj/satellite/console/consoleauth"
"storj.io/storj/satellite/metabase"
)
var (
ipRegexp = regexp.MustCompile(`^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$`)
)
func getAPIKey(ctx context.Context, header *pb.RequestHeader) (key *macaroon.APIKey, err error) {
defer mon.Task()(&ctx)(&err)
if header != nil {
return macaroon.ParseRawAPIKey(header.ApiKey)
}
keyData, ok := consoleauth.GetAPIKey(ctx)
if !ok {
return nil, errs.New("missing credentials")
}
return macaroon.ParseAPIKey(string(keyData))
}
// validateAuth validates things like API key, user permissions and rate limit and always returns valid rpc error.
func (endpoint *Endpoint) validateAuth(ctx context.Context, header *pb.RequestHeader, action macaroon.Action) (_ *console.APIKeyInfo, err error) {
defer mon.Task()(&ctx)(&err)
key, keyInfo, err := endpoint.validateBasic(ctx, header)
if err != nil {
return nil, err
}
err = key.Check(ctx, keyInfo.Secret, action, endpoint.revocations)
if err != nil {
endpoint.log.Debug("unauthorized request", zap.Error(err))
return nil, rpcstatus.Error(rpcstatus.PermissionDenied, "Unauthorized API credentials")
}
return keyInfo, nil
}
func (endpoint *Endpoint) validateBasic(ctx context.Context, header *pb.RequestHeader) (_ *macaroon.APIKey, _ *console.APIKeyInfo, err error) {
defer mon.Task()(&ctx)(&err)
key, err := getAPIKey(ctx, header)
if err != nil {
endpoint.log.Debug("invalid request", zap.Error(err))
return nil, nil, rpcstatus.Error(rpcstatus.InvalidArgument, "Invalid API credentials")
}
keyInfo, err := endpoint.apiKeys.GetByHead(ctx, key.Head())
if err != nil {
endpoint.log.Debug("unauthorized request", zap.Error(err))
return nil, nil, rpcstatus.Error(rpcstatus.PermissionDenied, "Unauthorized API credentials")
}
if err = endpoint.checkRate(ctx, keyInfo.ProjectID); err != nil {
endpoint.log.Debug("rate check failed", zap.Error(err))
return nil, nil, err
}
return key, keyInfo, nil
}
func (endpoint *Endpoint) validateRevoke(ctx context.Context, header *pb.RequestHeader, macToRevoke *macaroon.Macaroon) (_ *console.APIKeyInfo, err error) {
defer mon.Task()(&ctx)(&err)
key, keyInfo, err := endpoint.validateBasic(ctx, header)
if err != nil {
return nil, err
}
// The macaroon to revoke must be valid with the same secret as the key.
if !macToRevoke.Validate(keyInfo.Secret) {
return nil, rpcstatus.Error(rpcstatus.InvalidArgument, "Macaroon to revoke invalid")
}
keyTail := key.Tail()
tails := macToRevoke.Tails(keyInfo.Secret)
// A macaroon cannot revoke itself. So we only check len(tails-1), skipping
// the final tail. To be valid, the final tail of the auth key must be
// contained within the checked tails of the macaroon we want to revoke.
for i := 0; i < len(tails)-1; i++ {
if subtle.ConstantTimeCompare(tails[i], keyTail) == 1 {
return keyInfo, nil
}
}
return nil, rpcstatus.Error(rpcstatus.PermissionDenied, "Unauthorized attempt to revoke macaroon")
}
func (endpoint *Endpoint) checkRate(ctx context.Context, projectID uuid.UUID) (err error) {
defer mon.Task()(&ctx)(&err)
if !endpoint.config.RateLimiter.Enabled {
return nil
}
limiter, err := endpoint.limiterCache.Get(projectID.String(), func() (interface{}, error) {
limit := rate.Limit(endpoint.config.RateLimiter.Rate)
project, err := endpoint.projects.Get(ctx, projectID)
if err != nil {
return false, err
}
if project.RateLimit != nil && *project.RateLimit > 0 {
limit = rate.Limit(*project.RateLimit)
}
// initialize the limiter with limit and burst the same so that we don't limit how quickly calls
// are made within the second.
return rate.NewLimiter(limit, int(limit)), nil
})
if err != nil {
return rpcstatus.Error(rpcstatus.Unavailable, err.Error())
}
if !limiter.(*rate.Limiter).Allow() {
endpoint.log.Warn("too many requests for project",
zap.Stringer("projectID", projectID),
zap.Float64("limit", float64(limiter.(*rate.Limiter).Limit())))
mon.Event("metainfo_rate_limit_exceeded") //mon:locked
return rpcstatus.Error(rpcstatus.ResourceExhausted, "Too Many Requests")
}
return nil
}
func (endpoint *Endpoint) validateBucket(ctx context.Context, bucket []byte) (err error) {
defer mon.Task()(&ctx)(&err)
if len(bucket) == 0 {
return Error.Wrap(storj.ErrNoBucket.New(""))
}
if len(bucket) < 3 || len(bucket) > 63 {
return Error.New("bucket name must be at least 3 and no more than 63 characters long")
}
// Regexp not used because benchmark shows it will be slower for valid bucket names
// https://gist.github.com/mniewrzal/49de3af95f36e63e88fac24f565e444c
labels := bytes.Split(bucket, []byte("."))
for _, label := range labels {
err = validateBucketLabel(label)
if err != nil {
return err
}
}
if ipRegexp.MatchString(string(bucket)) {
return Error.New("bucket name cannot be formatted as an IP address")
}
return nil
}
func validateBucketLabel(label []byte) error {
if len(label) == 0 {
return Error.New("bucket label cannot be empty")
}
if !isLowerLetter(label[0]) && !isDigit(label[0]) {
return Error.New("bucket label must start with a lowercase letter or number")
}
if label[0] == '-' || label[len(label)-1] == '-' {
return Error.New("bucket label cannot start or end with a hyphen")
}
for i := 1; i < len(label)-1; i++ {
if !isLowerLetter(label[i]) && !isDigit(label[i]) && (label[i] != '-') && (label[i] != '.') {
return Error.New("bucket name must contain only lowercase letters, numbers or hyphens")
}
}
return nil
}
func isLowerLetter(r byte) bool {
return r >= 'a' && r <= 'z'
}
func isDigit(r byte) bool {
return r >= '0' && r <= '9'
}
func (endpoint *Endpoint) validateRemoteSegment(ctx context.Context, commitRequest metabase.CommitSegment, originalLimits []*pb.OrderLimit) (err error) {
defer mon.Task()(&ctx)(&err)
if len(originalLimits) == 0 {
return Error.New("no order limits")
}
if len(originalLimits) != int(commitRequest.Redundancy.TotalShares) {
return Error.New("invalid no order limit for piece")
}
maxAllowed, err := encryption.CalcEncryptedSize(endpoint.config.MaxSegmentSize.Int64(), storj.EncryptionParameters{
CipherSuite: storj.EncAESGCM,
BlockSize: 128, // intentionally low block size to allow maximum possible encryption overhead
})
if err != nil {
return err
}
if int64(commitRequest.EncryptedSize) > maxAllowed || commitRequest.EncryptedSize < 0 {
return Error.New("encrypted segment size %v is out of range, maximum allowed is %v", commitRequest.EncryptedSize, maxAllowed)
}
// TODO more validation for plain size and plain offset
if commitRequest.PlainSize > commitRequest.EncryptedSize {
return Error.New("plain segment size %v is out of range, maximum allowed is %v", commitRequest.PlainSize, commitRequest.EncryptedSize)
}
pieceNums := make(map[uint16]struct{})
nodeIds := make(map[storj.NodeID]struct{})
for _, piece := range commitRequest.Pieces {
if int(piece.Number) >= len(originalLimits) {
return Error.New("invalid piece number")
}
limit := originalLimits[piece.Number]
if limit == nil {
return Error.New("empty order limit for piece")
}
err := endpoint.orders.VerifyOrderLimitSignature(ctx, limit)
if err != nil {
return err
}
// expect that too much time has not passed between order limit creation and now
if time.Since(limit.OrderCreation) > endpoint.config.MaxCommitInterval {
return Error.New("Segment not committed before max commit interval of %f minutes.", endpoint.config.MaxCommitInterval.Minutes())
}
derivedPieceID := commitRequest.RootPieceID.Derive(piece.StorageNode, int32(piece.Number))
if limit.PieceId.IsZero() || limit.PieceId != derivedPieceID {
return Error.New("invalid order limit piece id")
}
if piece.StorageNode != limit.StorageNodeId {
return Error.New("piece NodeID != order limit NodeID")
}
if _, ok := pieceNums[piece.Number]; ok {
return Error.New("piece num %d is duplicated", piece.Number)
}
if _, ok := nodeIds[piece.StorageNode]; ok {
return Error.New("node id %s for piece num %d is duplicated", piece.StorageNode.String(), piece.Number)
}
pieceNums[piece.Number] = struct{}{}
nodeIds[piece.StorageNode] = struct{}{}
}
return nil
}