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127 lines
4.2 KiB
Go
127 lines
4.2 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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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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"fmt"
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"io"
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"net/http"
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"github.com/minio/minio/internal/fips"
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"github.com/minio/minio/internal/ioutil"
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"github.com/minio/minio/internal/logger"
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"github.com/minio/sio"
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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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// Type represents an AWS SSE type:
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// • SSE-C
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// • SSE-S3
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// • SSE-KMS
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type Type interface {
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fmt.Stringer
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IsRequested(http.Header) bool
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IsEncrypted(map[string]string) bool
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}
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// IsRequested returns true and the SSE Type if the HTTP headers
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// indicate that some form server-side encryption is requested.
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//
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// If no SSE headers are present then IsRequested returns false
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// and no Type.
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func IsRequested(h http.Header) (Type, bool) {
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switch {
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case S3.IsRequested(h):
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return S3, true
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case S3KMS.IsRequested(h):
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return S3KMS, true
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case SSEC.IsRequested(h):
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return SSEC, true
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default:
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return nil, false
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}
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}
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// UnsealObjectKey extracts and decrypts the sealed object key
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// from the metadata using the SSE-Copy client key of the HTTP headers
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// and returns the decrypted object key.
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func (sse ssecCopy) UnsealObjectKey(h http.Header, metadata map[string]string, bucket, object string) (key ObjectKey, err error) {
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clientKey, err := sse.ParseHTTP(h)
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if err != nil {
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return
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}
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return unsealObjectKey(clientKey[:], metadata, bucket, object)
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}
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// unsealObjectKey decrypts and returns the sealed object key
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// from the metadata using the SSE-C client key.
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func unsealObjectKey(clientKey []byte, metadata map[string]string, bucket, object string) (key ObjectKey, err error) {
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sealedKey, err := SSEC.ParseMetadata(metadata)
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if err != nil {
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return
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}
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err = key.Unseal(clientKey, sealedKey, SSEC.String(), bucket, object)
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return
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}
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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[:], CipherSuites: fips.CipherSuitesDARE()})
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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[:], CipherSuites: fips.CipherSuitesDARE()})
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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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