mirror of
https://github.com/containers/podman.git
synced 2025-12-03 19:59:39 +08:00
801977b40d
See release notes: https://github.com/containers/image/releases/tag/v5.2.0 Fixes: #4877 Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
61 lines
2.4 KiB
Go
61 lines
2.4 KiB
Go
package iolimits
|
|
|
|
import (
|
|
"io"
|
|
"io/ioutil"
|
|
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
// All constants below are intended to be used as limits for `ReadAtMost`. The
|
|
// immediate use-case for limiting the size of in-memory copied data is to
|
|
// protect against OOM DOS attacks as described inCVE-2020-1702. Instead of
|
|
// copying data until running out of memory, we error out after hitting the
|
|
// specified limit.
|
|
const (
|
|
// megaByte denotes one megabyte and is intended to be used as a limit in
|
|
// `ReadAtMost`.
|
|
megaByte = 1 << 20
|
|
// MaxManifestBodySize is the maximum allowed size of a manifest. The limit
|
|
// of 4 MB aligns with the one of a Docker registry:
|
|
// https://github.com/docker/distribution/blob/a8371794149d1d95f1e846744b05c87f2f825e5a/registry/handlers/manifests.go#L30
|
|
MaxManifestBodySize = 4 * megaByte
|
|
// MaxAuthTokenBodySize is the maximum allowed size of an auth token.
|
|
// The limit of 1 MB is considered to be greatly sufficient.
|
|
MaxAuthTokenBodySize = megaByte
|
|
// MaxSignatureListBodySize is the maximum allowed size of a signature list.
|
|
// The limit of 4 MB is considered to be greatly sufficient.
|
|
MaxSignatureListBodySize = 4 * megaByte
|
|
// MaxSignatureBodySize is the maximum allowed size of a signature.
|
|
// The limit of 4 MB is considered to be greatly sufficient.
|
|
MaxSignatureBodySize = 4 * megaByte
|
|
// MaxErrorBodySize is the maximum allowed size of an error-response body.
|
|
// The limit of 1 MB is considered to be greatly sufficient.
|
|
MaxErrorBodySize = megaByte
|
|
// MaxConfigBodySize is the maximum allowed size of a config blob.
|
|
// The limit of 4 MB is considered to be greatly sufficient.
|
|
MaxConfigBodySize = 4 * megaByte
|
|
// MaxOpenShiftStatusBody is the maximum allowed size of an OpenShift status body.
|
|
// The limit of 4 MB is considered to be greatly sufficient.
|
|
MaxOpenShiftStatusBody = 4 * megaByte
|
|
// MaxTarFileManifestSize is the maximum allowed size of a (docker save)-like manifest (which may contain multiple images)
|
|
// The limit of 1 MB is considered to be greatly sufficient.
|
|
MaxTarFileManifestSize = megaByte
|
|
)
|
|
|
|
// ReadAtMost reads from reader and errors out if the specified limit (in bytes) is exceeded.
|
|
func ReadAtMost(reader io.Reader, limit int) ([]byte, error) {
|
|
limitedReader := io.LimitReader(reader, int64(limit+1))
|
|
|
|
res, err := ioutil.ReadAll(limitedReader)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if len(res) > limit {
|
|
return nil, errors.Errorf("exceeded maximum allowed size of %d bytes", limit)
|
|
}
|
|
|
|
return res, nil
|
|
}
|