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285 lines
10 KiB
285 lines
10 KiB
// 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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"encoding/base64"
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"errors"
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xhttp "github.com/minio/minio/cmd/http"
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"github.com/minio/minio/cmd/logger"
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)
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// IsMultiPart returns true if the object metadata indicates
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// that it was uploaded using some form of server-side-encryption
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// and the S3 multipart API.
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func IsMultiPart(metadata map[string]string) bool {
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if _, ok := metadata[SSEMultipart]; ok {
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return true
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}
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return false
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}
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// RemoveSensitiveEntries removes confidential encryption
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// information - e.g. the SSE-C key - from the metadata map.
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// It has the same semantics as RemoveSensitiveHeaders.
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func RemoveSensitiveEntries(metadata map[string]string) { // The functions is tested in TestRemoveSensitiveHeaders for compatibility reasons
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delete(metadata, SSECKey)
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delete(metadata, SSECopyKey)
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delete(metadata, xhttp.AmzMetaUnencryptedContentLength)
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delete(metadata, xhttp.AmzMetaUnencryptedContentMD5)
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}
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// RemoveSSEHeaders removes all crypto-specific SSE
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// header entries from the metadata map.
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func RemoveSSEHeaders(metadata map[string]string) {
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delete(metadata, SSEHeader)
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delete(metadata, SSEKmsID)
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delete(metadata, SSEKmsContext)
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delete(metadata, SSECKeyMD5)
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delete(metadata, SSECAlgorithm)
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}
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// RemoveInternalEntries removes all crypto-specific internal
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// metadata entries from the metadata map.
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func RemoveInternalEntries(metadata map[string]string) {
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delete(metadata, SSEMultipart)
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delete(metadata, SSEIV)
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delete(metadata, SSESealAlgorithm)
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delete(metadata, SSECSealedKey)
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delete(metadata, S3SealedKey)
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delete(metadata, S3KMSKeyID)
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delete(metadata, S3KMSSealedKey)
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}
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// IsSourceEncrypted returns true if the source is encrypted
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func IsSourceEncrypted(metadata map[string]string) bool {
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if _, ok := metadata[SSECAlgorithm]; ok {
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return true
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}
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if _, ok := metadata[SSEHeader]; ok {
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return true
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}
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return false
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}
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// IsEncrypted returns true if the object metadata indicates
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// that it was uploaded using some form of server-side-encryption.
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//
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// IsEncrypted only checks whether the metadata contains at least
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// one entry indicating SSE-C or SSE-S3.
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func IsEncrypted(metadata map[string]string) bool {
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if _, ok := metadata[SSEIV]; ok {
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return true
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}
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if _, ok := metadata[SSESealAlgorithm]; ok {
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return true
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}
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if IsMultiPart(metadata) {
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return true
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}
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if S3.IsEncrypted(metadata) {
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return true
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}
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if SSEC.IsEncrypted(metadata) {
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return true
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}
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return false
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}
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// IsEncrypted returns true if the object metadata indicates
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// that the object was uploaded using SSE-S3.
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func (s3) IsEncrypted(metadata map[string]string) bool {
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if _, ok := metadata[S3SealedKey]; ok {
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return true
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}
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if _, ok := metadata[S3KMSKeyID]; ok {
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return true
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}
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if _, ok := metadata[S3KMSSealedKey]; ok {
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return true
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}
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return false
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}
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// IsEncrypted returns true if the object metadata indicates
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// that the object was uploaded using SSE-C.
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func (ssec) IsEncrypted(metadata map[string]string) bool {
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if _, ok := metadata[SSECSealedKey]; ok {
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return true
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}
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return false
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}
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// CreateMultipartMetadata adds the multipart flag entry to metadata
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// and returns modifed metadata. It allocates a new metadata map if
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// metadata is nil.
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func CreateMultipartMetadata(metadata map[string]string) map[string]string {
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if metadata == nil {
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return map[string]string{SSEMultipart: ""}
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}
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metadata[SSEMultipart] = ""
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return metadata
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}
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// CreateMetadata encodes the sealed object key into the metadata and returns
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// the modified metadata. If the keyID and the kmsKey is not empty it encodes
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// both into the metadata as well. It allocates a new metadata map if metadata
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// is nil.
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func (s3) CreateMetadata(metadata map[string]string, keyID string, kmsKey []byte, sealedKey SealedKey) map[string]string {
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if sealedKey.Algorithm != SealAlgorithm {
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logger.CriticalIf(context.Background(), Errorf("The seal algorithm '%s' is invalid for SSE-S3", sealedKey.Algorithm))
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}
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// There are two possibilites:
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// - We use a KMS -> There must be non-empty key ID and a KMS data key.
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// - We use a K/V -> There must be no key ID and no KMS data key.
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// Otherwise, the caller has passed an invalid argument combination.
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if keyID == "" && len(kmsKey) != 0 {
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logger.CriticalIf(context.Background(), errors.New("The key ID must not be empty if a KMS data key is present"))
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}
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if keyID != "" && len(kmsKey) == 0 {
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logger.CriticalIf(context.Background(), errors.New("The KMS data key must not be empty if a key ID is present"))
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}
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if metadata == nil {
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metadata = make(map[string]string, 5)
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}
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metadata[SSESealAlgorithm] = sealedKey.Algorithm
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metadata[SSEIV] = base64.StdEncoding.EncodeToString(sealedKey.IV[:])
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metadata[S3SealedKey] = base64.StdEncoding.EncodeToString(sealedKey.Key[:])
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if len(kmsKey) > 0 && keyID != "" { // We use a KMS -> Store key ID and sealed KMS data key.
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metadata[S3KMSKeyID] = keyID
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metadata[S3KMSSealedKey] = base64.StdEncoding.EncodeToString(kmsKey)
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}
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return metadata
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}
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// ParseMetadata extracts all SSE-S3 related values from the object metadata
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// and checks whether they are well-formed. It returns the sealed object key
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// on success. If the metadata contains both, a KMS master key ID and a sealed
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// KMS data key it returns both. If the metadata does not contain neither a
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// KMS master key ID nor a sealed KMS data key it returns an empty keyID and
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// KMS data key. Otherwise, it returns an error.
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func (s3) ParseMetadata(metadata map[string]string) (keyID string, kmsKey []byte, sealedKey SealedKey, err error) {
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// Extract all required values from object metadata
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b64IV, ok := metadata[SSEIV]
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if !ok {
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return keyID, kmsKey, sealedKey, errMissingInternalIV
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}
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algorithm, ok := metadata[SSESealAlgorithm]
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if !ok {
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return keyID, kmsKey, sealedKey, errMissingInternalSealAlgorithm
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}
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b64SealedKey, ok := metadata[S3SealedKey]
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if !ok {
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return keyID, kmsKey, sealedKey, Errorf("The object metadata is missing the internal sealed key for SSE-S3")
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}
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// There are two possibilites:
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// - We use a KMS -> There must be a key ID and a KMS data key.
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// - We use a K/V -> There must be no key ID and no KMS data key.
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// Otherwise, the metadata is corrupted.
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keyID, idPresent := metadata[S3KMSKeyID]
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b64KMSSealedKey, kmsKeyPresent := metadata[S3KMSSealedKey]
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if !idPresent && kmsKeyPresent {
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return keyID, kmsKey, sealedKey, Errorf("The object metadata is missing the internal KMS key-ID for SSE-S3")
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}
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if idPresent && !kmsKeyPresent {
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return keyID, kmsKey, sealedKey, Errorf("The object metadata is missing the internal sealed KMS data key for SSE-S3")
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}
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// Check whether all extracted values are well-formed
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iv, err := base64.StdEncoding.DecodeString(b64IV)
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if err != nil || len(iv) != 32 {
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return keyID, kmsKey, sealedKey, errInvalidInternalIV
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}
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if algorithm != SealAlgorithm {
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return keyID, kmsKey, sealedKey, errInvalidInternalSealAlgorithm
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}
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encryptedKey, err := base64.StdEncoding.DecodeString(b64SealedKey)
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if err != nil || len(encryptedKey) != 64 {
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return keyID, kmsKey, sealedKey, Errorf("The internal sealed key for SSE-S3 is invalid")
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}
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if idPresent && kmsKeyPresent { // We are using a KMS -> parse the sealed KMS data key.
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kmsKey, err = base64.StdEncoding.DecodeString(b64KMSSealedKey)
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if err != nil {
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return keyID, kmsKey, sealedKey, Errorf("The internal sealed KMS data key for SSE-S3 is invalid")
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}
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}
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sealedKey.Algorithm = algorithm
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copy(sealedKey.IV[:], iv)
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copy(sealedKey.Key[:], encryptedKey)
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return keyID, kmsKey, sealedKey, nil
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}
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// CreateMetadata encodes the sealed key into the metadata and returns the modified metadata.
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// It allocates a new metadata map if metadata is nil.
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func (ssec) CreateMetadata(metadata map[string]string, sealedKey SealedKey) map[string]string {
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if sealedKey.Algorithm != SealAlgorithm {
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logger.CriticalIf(context.Background(), Errorf("The seal algorithm '%s' is invalid for SSE-C", sealedKey.Algorithm))
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}
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if metadata == nil {
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metadata = make(map[string]string, 3)
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}
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metadata[SSESealAlgorithm] = SealAlgorithm
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metadata[SSEIV] = base64.StdEncoding.EncodeToString(sealedKey.IV[:])
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metadata[SSECSealedKey] = base64.StdEncoding.EncodeToString(sealedKey.Key[:])
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return metadata
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}
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// ParseMetadata extracts all SSE-C related values from the object metadata
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// and checks whether they are well-formed. It returns the sealed object key
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// on success.
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func (ssec) ParseMetadata(metadata map[string]string) (sealedKey SealedKey, err error) {
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// Extract all required values from object metadata
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b64IV, ok := metadata[SSEIV]
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if !ok {
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return sealedKey, errMissingInternalIV
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}
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algorithm, ok := metadata[SSESealAlgorithm]
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if !ok {
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return sealedKey, errMissingInternalSealAlgorithm
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}
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b64SealedKey, ok := metadata[SSECSealedKey]
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if !ok {
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return sealedKey, Errorf("The object metadata is missing the internal sealed key for SSE-C")
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}
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// Check whether all extracted values are well-formed
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iv, err := base64.StdEncoding.DecodeString(b64IV)
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if err != nil || len(iv) != 32 {
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return sealedKey, errInvalidInternalIV
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}
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if algorithm != SealAlgorithm && algorithm != InsecureSealAlgorithm {
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return sealedKey, errInvalidInternalSealAlgorithm
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}
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encryptedKey, err := base64.StdEncoding.DecodeString(b64SealedKey)
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if err != nil || len(encryptedKey) != 64 {
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return sealedKey, Errorf("The internal sealed key for SSE-C is invalid")
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}
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sealedKey.Algorithm = algorithm
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copy(sealedKey.IV[:], iv)
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copy(sealedKey.Key[:], encryptedKey)
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return sealedKey, nil
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}
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// IsETagSealed returns true if the etag seems to be encrypted.
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func IsETagSealed(etag []byte) bool { return len(etag) > 16 }
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