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a7c9058375
This commit adds a `fmt.Stringer` implementation for SSE-S3 and SSE-C. The string representation is the domain used for object key sealing. See: `ObjectKey.Seal(...)` and `ObjectKey.Unseal(...)`
107 lines
4.1 KiB
Go
107 lines
4.1 KiB
Go
// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package crypto
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import (
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"context"
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"errors"
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"io"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/pkg/ioutil"
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"github.com/minio/sio"
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)
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const (
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// SSEMultipart is the metadata key indicating that the object
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// was uploaded using the S3 multipart API and stored using
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// some from of server-side-encryption.
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SSEMultipart = "X-Minio-Internal-Encrypted-Multipart"
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// SSEIV is the metadata key referencing the random initialization
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// vector (IV) used for SSE-S3 and SSE-C key derivation.
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SSEIV = "X-Minio-Internal-Server-Side-Encryption-Iv"
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// SSESealAlgorithm is the metadata key referencing the algorithm
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// used by SSE-C and SSE-S3 to encrypt the object.
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SSESealAlgorithm = "X-Minio-Internal-Server-Side-Encryption-Seal-Algorithm"
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// SSECSealedKey is the metadata key referencing the sealed object-key for SSE-C.
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SSECSealedKey = "X-Minio-Internal-Server-Side-Encryption-Sealed-Key"
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// S3SealedKey is the metadata key referencing the sealed object-key for SSE-S3.
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S3SealedKey = "X-Minio-Internal-Server-Side-Encryption-S3-Sealed-Key"
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// S3KMSKeyID is the metadata key referencing the KMS key-id used to
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// generate/decrypt the S3-KMS-Sealed-Key. It is only used for SSE-S3 + KMS.
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S3KMSKeyID = "X-Minio-Internal-Server-Side-Encryption-S3-Kms-Key-Id"
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// S3KMSSealedKey is the metadata key referencing the encrypted key generated
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// by KMS. It is only used for SSE-S3 + KMS.
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S3KMSSealedKey = "X-Minio-Internal-Server-Side-Encryption-S3-Kms-Sealed-Key"
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)
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const (
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// SealAlgorithm is the encryption/sealing algorithm used to derive & seal
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// the key-encryption-key and to en/decrypt the object data.
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SealAlgorithm = "DAREv2-HMAC-SHA256"
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// InsecureSealAlgorithm is the legacy encryption/sealing algorithm used
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// to derive & seal the key-encryption-key and to en/decrypt the object data.
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// This algorithm should not be used for new objects because its key derivation
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// is not optimal. See: https://github.com/minio/minio/pull/6121
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InsecureSealAlgorithm = "DARE-SHA256"
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)
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// String returns the SSE domain as string. For SSE-S3 the
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// domain is "SSE-S3".
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func (s3) String() string { return "SSE-S3" }
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// String returns the SSE domain as string. For SSE-C the
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// domain is "SSE-C".
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func (ssec) String() string { return "SSE-C" }
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// EncryptSinglePart encrypts an io.Reader which must be the
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// the body of a single-part PUT request.
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func EncryptSinglePart(r io.Reader, key ObjectKey) io.Reader {
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r, err := sio.EncryptReader(r, sio.Config{MinVersion: sio.Version20, Key: key[:]})
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if err != nil {
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logger.CriticalIf(context.Background(), errors.New("Unable to encrypt io.Reader using object key"))
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}
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return r
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}
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// EncryptMultiPart encrypts an io.Reader which must be the body of
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// multi-part PUT request. It derives an unique encryption key from
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// the partID and the object key.
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func EncryptMultiPart(r io.Reader, partID int, key ObjectKey) io.Reader {
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partKey := key.DerivePartKey(uint32(partID))
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return EncryptSinglePart(r, ObjectKey(partKey))
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}
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// DecryptSinglePart decrypts an io.Writer which must an object
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// uploaded with the single-part PUT API. The offset and length
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// specify the requested range.
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func DecryptSinglePart(w io.Writer, offset, length int64, key ObjectKey) io.WriteCloser {
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const PayloadSize = 1 << 16 // DARE 2.0
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w = ioutil.LimitedWriter(w, offset%PayloadSize, length)
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decWriter, err := sio.DecryptWriter(w, sio.Config{Key: key[:]})
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if err != nil {
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logger.CriticalIf(context.Background(), errors.New("Unable to decrypt io.Writer using object key"))
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}
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return decWriter
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}
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