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sse-kms: fix assignment to potential nil map (#12250)

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This commit fixes a bug introduced by af0c65b.
When there is no / an empty client-provided SSE-KMS
context the `ParseMetadata` may return a nil map
(`kms.Context`).

When unsealing the object key we must check that
the context is nil before assigning a key-value pair.

Signed-off-by: Andreas Auernhammer <aead@mail.de>
This commit is contained in:
Andreas Auernhammer 2021-05-07 18:16:49 +02:00 committed by GitHub
parent cb0b36f8c2
commit 0ba8c0a19b
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 6 additions and 3 deletions
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9
cmd/crypto/sse-kms.go
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@ -28,6 +28,7 @@ import (
jsoniter "github.com/json-iterator/go"
xhttp "github.com/minio/minio/cmd/http"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/kms"
)
type ssekms struct{}
@ -94,15 +95,17 @@ func (ssekms) IsEncrypted(metadata map[string]string) bool {
// UnsealObjectKey extracts and decrypts the sealed object key
// from the metadata using KMS and returns the decrypted object
// key.
func (s3 ssekms) UnsealObjectKey(kms KMS, metadata map[string]string, bucket, object string) (key ObjectKey, err error) {
func (s3 ssekms) UnsealObjectKey(KMS kms.KMS, metadata map[string]string, bucket, object string) (key ObjectKey, err error) {
keyID, kmsKey, sealedKey, ctx, err := s3.ParseMetadata(metadata)
if err != nil {
return key, err
}
if _, ok := ctx[bucket]; !ok {
if ctx == nil {
ctx = kms.Context{bucket: path.Join(bucket, object)}
} else if _, ok := ctx[bucket]; !ok {
ctx[bucket] = path.Join(bucket, object)
}
unsealKey, err := kms.DecryptKey(keyID, kmsKey, ctx)
unsealKey, err := KMS.DecryptKey(keyID, kmsKey, ctx)
if err != nil {
return key, err
}