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crypto: add support for parsing/creating SSE-C/SSE-S3 metadata (#6169)

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* crypto: add support for parsing SSE-C/SSE-S3 metadata

This commit adds support for detecting and parsing
SSE-C/SSE-S3 object metadata. With the `IsEncrypted`
functions it is possible to determine whether an object
seems to be encrypted. With the `ParseMetadata` functions
it is possible to validate such metadata and extract the
SSE-C/SSE-S3 related values.

It also fixes some naming issues.

* crypto: add functions for creating SSE object metadata

This commit adds functions for creating SSE-S3 and
SSE-C metadata. It also adds a `CreateMultipartMetadata`
for creating multipart metadata.

For all functions unit tests are included.
This commit is contained in:
Andreas Auernhammer 2018-07-25 22:35:54 +02:00 committed by Harshavardhana
parent 2debe77586
commit 644c2ce326
8 changed files with 607 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
cmd/crypto/error.go
View File

@ -49,6 +49,14 @@ var (
ErrCustomerKeyMD5Mismatch = errors.New("The provided SSE-C key MD5 does not match the computed MD5 of the SSE-C key")
)
var (
errMissingInternalIV = Error{"The object metadata is missing the internal encryption IV"}
errMissingInternalSealAlgorithm = Error{"The object metadata is missing the internal seal algorithm"}
errInvalidInternalIV = Error{"The internal encryption IV is malformed"}
errInvalidInternalSealAlgorithm = Error{"The internal seal algorithm is invalid and not supported"}
)
var (
// errOutOfEntropy indicates that the a source of randomness (PRNG) wasn't able
// to produce enough random data. This is fatal error and should cause a panic.

12
cmd/crypto/header.go
View File

@ -70,9 +70,9 @@ func (s3) IsRequested(h http.Header) bool {
return ok
}
// Parse parses the SSE-S3 related HTTP headers and checks
// ParseHTTP parses the SSE-S3 related HTTP headers and checks
// whether they contain valid values.
func (s3) Parse(h http.Header) (err error) {
func (s3) ParseHTTP(h http.Header) (err error) {
if h.Get(SSEHeader) != SSEAlgorithmAES256 {
err = ErrInvalidEncryptionMethod
}
@ -123,9 +123,9 @@ func (ssecCopy) IsRequested(h http.Header) bool {
return false
}
// Parse parses the SSE-C headers and returns the SSE-C client key
// ParseHTTP parses the SSE-C headers and returns the SSE-C client key
// on success. SSE-C copy headers are ignored.
func (ssec) Parse(h http.Header) (key [32]byte, err error) {
func (ssec) ParseHTTP(h http.Header) (key [32]byte, err error) {
defer h.Del(SSECKey) // remove SSE-C key from headers after parsing
if h.Get(SSECAlgorithm) != SSEAlgorithmAES256 {
return key, ErrInvalidCustomerAlgorithm
@ -149,9 +149,9 @@ func (ssec) Parse(h http.Header) (key [32]byte, err error) {
return key, nil
}
// Parse parses the SSE-C copy headers and returns the SSE-C client key
// ParseHTTP parses the SSE-C copy headers and returns the SSE-C client key
// on success. Regular SSE-C headers are ignored.
func (ssecCopy) Parse(h http.Header) (key [32]byte, err error) {
func (ssecCopy) ParseHTTP(h http.Header) (key [32]byte, err error) {
defer h.Del(SSECopyKey) // remove SSE-C copy key of source object from headers after parsing
if h.Get(SSECopyAlgorithm) != SSEAlgorithmAES256 {
return key, ErrInvalidCustomerAlgorithm

6
cmd/crypto/header_test.go
View File

@ -49,7 +49,7 @@ var s3ParseTests = []struct {
func TestS3Parse(t *testing.T) {
for i, test := range s3ParseTests {
if err := S3.Parse(test.Header); err != test.ExpectedErr {
if err := S3.ParseHTTP(test.Header); err != test.ExpectedErr {
t.Errorf("Test %d: Wanted '%v' but got '%v'", i, test.ExpectedErr, err)
}
}
@ -204,7 +204,7 @@ var ssecParseTests = []struct {
func TestSSECParse(t *testing.T) {
var zeroKey [32]byte
for i, test := range ssecParseTests {
key, err := SSEC.Parse(test.Header)
key, err := SSEC.ParseHTTP(test.Header)
if err != test.ExpectedErr {
t.Errorf("Test %d: want error '%v' but got '%v'", i, test.ExpectedErr, err)
}
@ -286,7 +286,7 @@ var ssecCopyParseTests = []struct {
func TestSSECopyParse(t *testing.T) {
var zeroKey [32]byte
for i, test := range ssecCopyParseTests {
key, err := SSECopy.Parse(test.Header)
key, err := SSECopy.ParseHTTP(test.Header)
if err != test.ExpectedErr {
t.Errorf("Test %d: want error '%v' but got '%v'", i, test.ExpectedErr, err)
}

17
cmd/crypto/kms.go
View File

@ -80,12 +80,12 @@ type KMS interface {
// The context is cryptographically bound to the
// generated key. The same context must be provided
// again to unseal the generated key.
GenerateKey(keyID string, context Context) (key, sealedKey []byte, err error)
GenerateKey(keyID string, context Context) (key [32]byte, sealedKey []byte, err error)
// UnsealKey unseals the sealedKey using the master key
// referenced by the keyID. The provided context must
// match the context used to generate the sealed key.
UnsealKey(keyID string, sealedKey []byte, context Context) (key []byte, err error)
UnsealKey(keyID string, sealedKey []byte, context Context) (key [32]byte, err error)
}
type masterKeyKMS struct {
@ -98,9 +98,8 @@ type masterKeyKMS struct {
// to the generated keys.
func NewKMS(key [32]byte) KMS { return &masterKeyKMS{masterKey: key} }
func (kms *masterKeyKMS) GenerateKey(keyID string, ctx Context) (key, sealedKey []byte, err error) {
key = make([]byte, 32)
if _, err = io.ReadFull(rand.Reader, key); err != nil {
func (kms *masterKeyKMS) GenerateKey(keyID string, ctx Context) (key [32]byte, sealedKey []byte, err error) {
if _, err = io.ReadFull(rand.Reader, key[:]); err != nil {
logger.CriticalIf(context.Background(), errOutOfEntropy)
}
@ -108,22 +107,22 @@ func (kms *masterKeyKMS) GenerateKey(keyID string, ctx Context) (key, sealedKey
buffer bytes.Buffer
derivedKey = kms.deriveKey(keyID, ctx)
)
if n, err := sio.Encrypt(&buffer, bytes.NewReader(key), sio.Config{Key: derivedKey[:]}); err != nil || n != 64 {
if n, err := sio.Encrypt(&buffer, bytes.NewReader(key[:]), sio.Config{Key: derivedKey[:]}); err != nil || n != 64 {
logger.CriticalIf(context.Background(), errors.New("KMS: unable to encrypt data key"))
}
sealedKey = buffer.Bytes()
return key, sealedKey, nil
}
func (kms *masterKeyKMS) UnsealKey(keyID string, sealedKey []byte, ctx Context) (key []byte, err error) {
func (kms *masterKeyKMS) UnsealKey(keyID string, sealedKey []byte, ctx Context) (key [32]byte, err error) {
var (
buffer bytes.Buffer
derivedKey = kms.deriveKey(keyID, ctx)
)
if n, err := sio.Decrypt(&buffer, bytes.NewReader(sealedKey), sio.Config{Key: derivedKey[:]}); err != nil || n != 32 {
return nil, err // TODO(aead): upgrade sio to use sio.Error
return key, err // TODO(aead): upgrade sio to use sio.Error
}
key = buffer.Bytes()
copy(key[:], buffer.Bytes())
return key, nil
}

2
cmd/crypto/kms_test.go
View File

@ -53,7 +53,7 @@ func TestMasterKeyKMS(t *testing.T) {
if err == nil && test.ShouldFail {
t.Errorf("Test %d: KMS unsealed the generated successfully but should have failed", i)
}
if !test.ShouldFail && !bytes.Equal(key, unsealedKey) {
if !test.ShouldFail && !bytes.Equal(key[:], unsealedKey[:]) {
t.Errorf("Test %d: The generated and unsealed key differ", i)
}
}

213
cmd/crypto/metadata.go Normal file
View File

@ -0,0 +1,213 @@
// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package crypto
import (
"context"
"encoding/base64"
"fmt"
"github.com/minio/minio/cmd/logger"
)
// IsMultiPart returns true if the object metadata indicates
// that it was uploaded using some form of server-side-encryption
// and the S3 multipart API.
func IsMultiPart(metadata map[string]string) bool {
if _, ok := metadata[SSEMultipart]; ok {
return true
}
return false
}
// IsEncrypted returns true if the object metadata indicates
// that it was uploaded using some form of server-side-encryption.
//
// IsEncrypted only checks whether the metadata contains at least
// one entry indicating SSE-C or SSE-S3.
func IsEncrypted(metadata map[string]string) bool {
if _, ok := metadata[SSEIV]; ok {
return true
}
if _, ok := metadata[SSESealAlgorithm]; ok {
return true
}
if IsMultiPart(metadata) {
return true
}
if S3.IsEncrypted(metadata) {
return true
}
if SSEC.IsEncrypted(metadata) {
return true
}
return false
}
// IsEncrypted returns true if the object metadata indicates
// that the object was uploaded using SSE-S3.
func (s3) IsEncrypted(metadata map[string]string) bool {
if _, ok := metadata[S3SealedKey]; ok {
return true
}
if _, ok := metadata[S3KMSKeyID]; ok {
return true
}
if _, ok := metadata[S3KMSSealedKey]; ok {
return true
}
return false
}
// IsEncrypted returns true if the object metadata indicates
// that the object was uploaded using SSE-C.
func (ssec) IsEncrypted(metadata map[string]string) bool {
if _, ok := metadata[SSECSealedKey]; ok {
return true
}
return false
}
// CreateMultipartMetadata adds the multipart flag entry to metadata
// and returns modifed metadata. It allocates a new metadata map if
// metadata is nil.
func CreateMultipartMetadata(metadata map[string]string) map[string]string {
if metadata == nil {
metadata = map[string]string{}
}
metadata[SSEMultipart] = ""
return metadata
}
// CreateMetadata encodes the keyID, the sealed kms data key and the sealed key
// into the metadata and returns the modified metadata. It allocates a new
// metadata map if metadata is nil.
func (s3) CreateMetadata(metadata map[string]string, keyID string, kmsKey []byte, sealedKey SealedKey) map[string]string {
if sealedKey.Algorithm != SealAlgorithm {
logger.CriticalIf(context.Background(), fmt.Errorf("The seal algorithm '%s' is invalid for SSE-S3", sealedKey.Algorithm))
}
if metadata == nil {
metadata = map[string]string{}
}
metadata[S3KMSKeyID] = keyID
metadata[SSESealAlgorithm] = sealedKey.Algorithm
metadata[SSEIV] = base64.StdEncoding.EncodeToString(sealedKey.IV[:])
metadata[S3SealedKey] = base64.StdEncoding.EncodeToString(sealedKey.Key[:])
metadata[S3KMSSealedKey] = base64.StdEncoding.EncodeToString(kmsKey)
return metadata
}
// ParseMetadata extracts all SSE-S3 related values from the object metadata
// and checks whether they are well-formed. It returns the KMS key-ID, the
// sealed KMS key and the sealed object key on success.
func (s3) ParseMetadata(metadata map[string]string) (keyID string, kmsKey []byte, sealedKey SealedKey, err error) {
// Extract all required values from object metadata
b64IV, ok := metadata[SSEIV]
if !ok {
return keyID, kmsKey, sealedKey, errMissingInternalIV
}
algorithm, ok := metadata[SSESealAlgorithm]
if !ok {
return keyID, kmsKey, sealedKey, errMissingInternalSealAlgorithm
}
b64SealedKey, ok := metadata[S3SealedKey]
if !ok {
return keyID, kmsKey, sealedKey, Error{"The object metadata is missing the internal sealed key for SSE-S3"}
}
keyID, ok = metadata[S3KMSKeyID]
if !ok {
return keyID, kmsKey, sealedKey, Error{"The object metadata is missing the internal KMS key-ID for SSE-S3"}
}
b64KMSSealedKey, ok := metadata[S3KMSSealedKey]
if !ok {
return keyID, kmsKey, sealedKey, Error{"The object metadata is missing the internal sealed KMS data key for SSE-S3"}
}
// Check whether all extracted values are well-formed
iv, err := base64.StdEncoding.DecodeString(b64IV)
if err != nil || len(iv) != 32 {
return keyID, kmsKey, sealedKey, errInvalidInternalIV
}
if algorithm != SealAlgorithm {
return keyID, kmsKey, sealedKey, errInvalidInternalSealAlgorithm
}
encryptedKey, err := base64.StdEncoding.DecodeString(b64SealedKey)
if err != nil || len(encryptedKey) != 64 {
return keyID, kmsKey, sealedKey, Error{"The internal sealed key for SSE-S3 is invalid"}
}
kmsKey, err = base64.StdEncoding.DecodeString(b64KMSSealedKey)
if err != nil {
return keyID, kmsKey, sealedKey, Error{"The internal sealed KMS data key for SSE-S3 is invalid"}
}
sealedKey.Algorithm = algorithm
copy(sealedKey.IV[:], iv)
copy(sealedKey.Key[:], encryptedKey)
return keyID, kmsKey, sealedKey, nil
}
// CreateMetadata encodes the sealed key into the metadata and returns the modified metadata.
// It allocates a new metadata map if metadata is nil.
func (ssec) CreateMetadata(metadata map[string]string, sealedKey SealedKey) map[string]string {
if sealedKey.Algorithm != SealAlgorithm {
logger.CriticalIf(context.Background(), fmt.Errorf("The seal algorithm '%s' is invalid for SSE-C", sealedKey.Algorithm))
}
if metadata == nil {
metadata = map[string]string{}
}
metadata[SSESealAlgorithm] = SealAlgorithm
metadata[SSEIV] = base64.StdEncoding.EncodeToString(sealedKey.IV[:])
metadata[SSECSealedKey] = base64.StdEncoding.EncodeToString(sealedKey.Key[:])
return metadata
}
// ParseMetadata extracts all SSE-C related values from the object metadata
// and checks whether they are well-formed. It returns the sealed object key
// on success.
func (ssec) ParseMetadata(metadata map[string]string) (sealedKey SealedKey, err error) {
// Extract all required values from object metadata
b64IV, ok := metadata[SSEIV]
if !ok {
return sealedKey, errMissingInternalIV
}
algorithm, ok := metadata[SSESealAlgorithm]
if !ok {
return sealedKey, errMissingInternalSealAlgorithm
}
b64SealedKey, ok := metadata[SSECSealedKey]
if !ok {
return sealedKey, Error{"The object metadata is missing the internal sealed key for SSE-C"}
}
// Check whether all extracted values are well-formed
iv, err := base64.StdEncoding.DecodeString(b64IV)
if err != nil || len(iv) != 32 {
return sealedKey, errInvalidInternalIV
}
if algorithm != SealAlgorithm && algorithm != InsecureSealAlgorithm {
return sealedKey, errInvalidInternalSealAlgorithm
}
encryptedKey, err := base64.StdEncoding.DecodeString(b64SealedKey)
if err != nil || len(encryptedKey) != 64 {
return sealedKey, Error{"The internal sealed key for SSE-C is invalid"}
}
sealedKey.Algorithm = algorithm
copy(sealedKey.IV[:], iv)
copy(sealedKey.Key[:], encryptedKey)
return sealedKey, nil
}

361
cmd/crypto/metadata_test.go Normal file
View File

@ -0,0 +1,361 @@
// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package crypto
import (
"bytes"
"encoding/base64"
"testing"
"github.com/minio/minio/cmd/logger"
)
var isMultipartTests = []struct {
Metadata map[string]string
Multipart bool
}{
{Multipart: true, Metadata: map[string]string{SSEMultipart: ""}}, // 0
{Multipart: true, Metadata: map[string]string{"X-Minio-Internal-Encrypted-Multipart": ""}}, // 1
{Multipart: true, Metadata: map[string]string{SSEMultipart: "some-value"}}, // 2
{Multipart: false, Metadata: map[string]string{"": ""}}, // 3
{Multipart: false, Metadata: map[string]string{"X-Minio-Internal-EncryptedMultipart": ""}}, // 4
}
func TestIsMultipart(t *testing.T) {
for i, test := range isMultipartTests {
if isMultipart := IsMultiPart(test.Metadata); isMultipart != test.Multipart {
t.Errorf("Test %d: got '%v' - want '%v'", i, isMultipart, test.Multipart)
}
}
}
var isEncryptedTests = []struct {
Metadata map[string]string
Encrypted bool
}{
{Encrypted: true, Metadata: map[string]string{SSEMultipart: ""}}, // 0
{Encrypted: true, Metadata: map[string]string{SSEIV: ""}}, // 1
{Encrypted: true, Metadata: map[string]string{SSESealAlgorithm: ""}}, // 2
{Encrypted: true, Metadata: map[string]string{SSECSealedKey: ""}}, // 3
{Encrypted: true, Metadata: map[string]string{S3SealedKey: ""}}, // 4
{Encrypted: true, Metadata: map[string]string{S3KMSKeyID: ""}}, // 5
{Encrypted: true, Metadata: map[string]string{S3KMSSealedKey: ""}}, // 6
{Encrypted: false, Metadata: map[string]string{"": ""}}, // 7
{Encrypted: false, Metadata: map[string]string{"X-Minio-Internal-Server-Side-Encryption": ""}}, // 8
}
func TestIsEncrypted(t *testing.T) {
for i, test := range isEncryptedTests {
if isEncrypted := IsEncrypted(test.Metadata); isEncrypted != test.Encrypted {
t.Errorf("Test %d: got '%v' - want '%v'", i, isEncrypted, test.Encrypted)
}
}
}
var s3IsEncryptedTests = []struct {
Metadata map[string]string
Encrypted bool
}{
{Encrypted: false, Metadata: map[string]string{SSEMultipart: ""}}, // 0
{Encrypted: false, Metadata: map[string]string{SSEIV: ""}}, // 1
{Encrypted: false, Metadata: map[string]string{SSESealAlgorithm: ""}}, // 2
{Encrypted: false, Metadata: map[string]string{SSECSealedKey: ""}}, // 3
{Encrypted: true, Metadata: map[string]string{S3SealedKey: ""}}, // 4
{Encrypted: true, Metadata: map[string]string{S3KMSKeyID: ""}}, // 5
{Encrypted: true, Metadata: map[string]string{S3KMSSealedKey: ""}}, // 6
{Encrypted: false, Metadata: map[string]string{"": ""}}, // 7
{Encrypted: false, Metadata: map[string]string{"X-Minio-Internal-Server-Side-Encryption": ""}}, // 8
}
func TestS3IsEncrypted(t *testing.T) {
for i, test := range s3IsEncryptedTests {
if isEncrypted := S3.IsEncrypted(test.Metadata); isEncrypted != test.Encrypted {
t.Errorf("Test %d: got '%v' - want '%v'", i, isEncrypted, test.Encrypted)
}
}
}
var ssecIsEncryptedTests = []struct {
Metadata map[string]string
Encrypted bool
}{
{Encrypted: false, Metadata: map[string]string{SSEMultipart: ""}}, // 0
{Encrypted: false, Metadata: map[string]string{SSEIV: ""}}, // 1
{Encrypted: false, Metadata: map[string]string{SSESealAlgorithm: ""}}, // 2
{Encrypted: true, Metadata: map[string]string{SSECSealedKey: ""}}, // 3
{Encrypted: false, Metadata: map[string]string{S3SealedKey: ""}}, // 4
{Encrypted: false, Metadata: map[string]string{S3KMSKeyID: ""}}, // 5
{Encrypted: false, Metadata: map[string]string{S3KMSSealedKey: ""}}, // 6
{Encrypted: false, Metadata: map[string]string{"": ""}}, // 7
{Encrypted: false, Metadata: map[string]string{"X-Minio-Internal-Server-Side-Encryption": ""}}, // 8
}
func TestSSECIsEncrypted(t *testing.T) {
for i, test := range ssecIsEncryptedTests {
if isEncrypted := SSEC.IsEncrypted(test.Metadata); isEncrypted != test.Encrypted {
t.Errorf("Test %d: got '%v' - want '%v'", i, isEncrypted, test.Encrypted)
}
}
}
var s3ParseMetadataTests = []struct {
Metadata map[string]string
ExpectedErr error
DataKey []byte
KeyID string
SealedKey SealedKey
}{
{ExpectedErr: errMissingInternalIV, Metadata: map[string]string{}, DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{}}, // 0
{
ExpectedErr: errMissingInternalSealAlgorithm, Metadata: map[string]string{SSEIV: ""},
DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{},
}, // 1
{
ExpectedErr: Error{"The object metadata is missing the internal sealed key for SSE-S3"},
Metadata: map[string]string{SSEIV: "", SSESealAlgorithm: ""}, DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{},
}, // 2
{
ExpectedErr: Error{"The object metadata is missing the internal KMS key-ID for SSE-S3"},
Metadata: map[string]string{SSEIV: "", SSESealAlgorithm: "", S3SealedKey: ""}, DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{},
}, // 3
{
ExpectedErr: Error{"The object metadata is missing the internal sealed KMS data key for SSE-S3"},
Metadata: map[string]string{SSEIV: "", SSESealAlgorithm: "", S3SealedKey: "", S3KMSKeyID: ""},
DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{},
}, // 4
{
ExpectedErr: errInvalidInternalIV,
Metadata: map[string]string{SSEIV: "", SSESealAlgorithm: "", S3SealedKey: "", S3KMSKeyID: "", S3KMSSealedKey: ""},
DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{},
}, // 5
{
ExpectedErr: errInvalidInternalSealAlgorithm,
Metadata: map[string]string{
SSEIV: base64.StdEncoding.EncodeToString(make([]byte, 32)), SSESealAlgorithm: "", S3SealedKey: "", S3KMSKeyID: "", S3KMSSealedKey: "",
},
DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{},
}, // 6
{
ExpectedErr: Error{"The internal sealed key for SSE-S3 is invalid"},
Metadata: map[string]string{
SSEIV: base64.StdEncoding.EncodeToString(make([]byte, 32)), SSESealAlgorithm: SealAlgorithm, S3SealedKey: "",
S3KMSKeyID: "", S3KMSSealedKey: "",
},
DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{},
}, // 7
{
ExpectedErr: Error{"The internal sealed KMS data key for SSE-S3 is invalid"},
Metadata: map[string]string{
SSEIV: base64.StdEncoding.EncodeToString(make([]byte, 32)), SSESealAlgorithm: SealAlgorithm,
S3SealedKey: base64.StdEncoding.EncodeToString(make([]byte, 64)), S3KMSKeyID: "key-1",
S3KMSSealedKey: ".MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ=", // invalid base64
},
DataKey: []byte{}, KeyID: "key-1", SealedKey: SealedKey{},
}, // 8
{
ExpectedErr: nil,
Metadata: map[string]string{
SSEIV: base64.StdEncoding.EncodeToString(make([]byte, 32)), SSESealAlgorithm: SealAlgorithm,
S3SealedKey: base64.StdEncoding.EncodeToString(make([]byte, 64)), S3KMSKeyID: "", S3KMSSealedKey: "",
},
DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{Algorithm: SealAlgorithm},
}, // 9
{
ExpectedErr: nil,
Metadata: map[string]string{
SSEIV: base64.StdEncoding.EncodeToString(append([]byte{1}, make([]byte, 31)...)), SSESealAlgorithm: SealAlgorithm,
S3SealedKey: base64.StdEncoding.EncodeToString(append([]byte{1}, make([]byte, 63)...)), S3KMSKeyID: "key-1",
S3KMSSealedKey: base64.StdEncoding.EncodeToString(make([]byte, 48)),
},
DataKey: make([]byte, 48), KeyID: "key-1", SealedKey: SealedKey{Algorithm: SealAlgorithm, Key: [64]byte{1}, IV: [32]byte{1}},
}, // 10
}
func TestS3ParseMetadata(t *testing.T) {
for i, test := range s3ParseMetadataTests {
keyID, dataKey, sealedKey, err := S3.ParseMetadata(test.Metadata)
if err != test.ExpectedErr {
t.Errorf("Test %d: got error '%v' - want error '%v'", i, err, test.ExpectedErr)
}
if !bytes.Equal(dataKey, test.DataKey) {
t.Errorf("Test %d: got data key '%v' - want data key '%v'", i, dataKey, test.DataKey)
}
if keyID != test.KeyID {
t.Errorf("Test %d: got key-ID '%v' - want key-ID '%v'", i, keyID, test.KeyID)
}
if sealedKey.Algorithm != test.SealedKey.Algorithm {
t.Errorf("Test %d: got sealed key algorithm '%v' - want sealed key algorithm '%v'", i, sealedKey.Algorithm, test.SealedKey.Algorithm)
}
if !bytes.Equal(sealedKey.Key[:], test.SealedKey.Key[:]) {
t.Errorf("Test %d: got sealed key '%v' - want sealed key '%v'", i, sealedKey.Key, test.SealedKey.Key)
}
if !bytes.Equal(sealedKey.IV[:], test.SealedKey.IV[:]) {
t.Errorf("Test %d: got sealed key IV '%v' - want sealed key IV '%v'", i, sealedKey.IV, test.SealedKey.IV)
}
}
}
var ssecParseMetadataTests = []struct {
Metadata map[string]string
ExpectedErr error
SealedKey SealedKey
}{
{ExpectedErr: errMissingInternalIV, Metadata: map[string]string{}, SealedKey: SealedKey{}}, // 0
{ExpectedErr: errMissingInternalSealAlgorithm, Metadata: map[string]string{SSEIV: ""}, SealedKey: SealedKey{}}, // 1
{
ExpectedErr: Error{"The object metadata is missing the internal sealed key for SSE-C"},
Metadata: map[string]string{SSEIV: "", SSESealAlgorithm: ""}, SealedKey: SealedKey{},
}, // 2
{
ExpectedErr: errInvalidInternalIV,
Metadata: map[string]string{SSEIV: "", SSESealAlgorithm: "", SSECSealedKey: ""}, SealedKey: SealedKey{},
}, // 3
{
ExpectedErr: errInvalidInternalSealAlgorithm,
Metadata: map[string]string{
SSEIV: base64.StdEncoding.EncodeToString(make([]byte, 32)), SSESealAlgorithm: "", SSECSealedKey: "",
},
SealedKey: SealedKey{},
}, // 4
{
ExpectedErr: Error{"The internal sealed key for SSE-C is invalid"},
Metadata: map[string]string{
SSEIV: base64.StdEncoding.EncodeToString(make([]byte, 32)), SSESealAlgorithm: SealAlgorithm, SSECSealedKey: "",
},
SealedKey: SealedKey{},
}, // 5
{
ExpectedErr: nil,
Metadata: map[string]string{
SSEIV: base64.StdEncoding.EncodeToString(make([]byte, 32)), SSESealAlgorithm: SealAlgorithm,
SSECSealedKey: base64.StdEncoding.EncodeToString(make([]byte, 64)),
},
SealedKey: SealedKey{Algorithm: SealAlgorithm},
}, // 6
{
ExpectedErr: nil,
Metadata: map[string]string{
SSEIV: base64.StdEncoding.EncodeToString(append([]byte{1}, make([]byte, 31)...)), SSESealAlgorithm: InsecureSealAlgorithm,
SSECSealedKey: base64.StdEncoding.EncodeToString(append([]byte{1}, make([]byte, 63)...)),
},
SealedKey: SealedKey{Algorithm: InsecureSealAlgorithm, Key: [64]byte{1}, IV: [32]byte{1}},
}, // 7
}
func TestCreateMultipartMetadata(t *testing.T) {
metadata := CreateMultipartMetadata(nil)
if v, ok := metadata[SSEMultipart]; !ok || v != "" {
t.Errorf("Metadata is missing the correct value for '%s': got '%s' - want '%s'", SSEMultipart, v, "")
}
}
func TestSSECParseMetadata(t *testing.T) {
for i, test := range ssecParseMetadataTests {
sealedKey, err := SSEC.ParseMetadata(test.Metadata)
if err != test.ExpectedErr {
t.Errorf("Test %d: got error '%v' - want error '%v'", i, err, test.ExpectedErr)
}
if sealedKey.Algorithm != test.SealedKey.Algorithm {
t.Errorf("Test %d: got sealed key algorithm '%v' - want sealed key algorithm '%v'", i, sealedKey.Algorithm, test.SealedKey.Algorithm)
}
if !bytes.Equal(sealedKey.Key[:], test.SealedKey.Key[:]) {
t.Errorf("Test %d: got sealed key '%v' - want sealed key '%v'", i, sealedKey.Key, test.SealedKey.Key)
}
if !bytes.Equal(sealedKey.IV[:], test.SealedKey.IV[:]) {
t.Errorf("Test %d: got sealed key IV '%v' - want sealed key IV '%v'", i, sealedKey.IV, test.SealedKey.IV)
}
}
}
var s3CreateMetadataTests = []struct {
KeyID string
SealedDataKey []byte
SealedKey SealedKey
}{
{KeyID: "", SealedDataKey: make([]byte, 48), SealedKey: SealedKey{Algorithm: SealAlgorithm}},
{KeyID: "cafebabe", SealedDataKey: make([]byte, 48), SealedKey: SealedKey{Algorithm: SealAlgorithm}},
{KeyID: "deadbeef", SealedDataKey: make([]byte, 32), SealedKey: SealedKey{IV: [32]byte{0xf7}, Key: [64]byte{0xea}, Algorithm: SealAlgorithm}},
}
func TestS3CreateMetadata(t *testing.T) {
defer func(disableLog bool) { logger.Disable = disableLog }(logger.Disable)
logger.Disable = true
for i, test := range s3CreateMetadataTests {
metadata := S3.CreateMetadata(nil, test.KeyID, test.SealedDataKey, test.SealedKey)
keyID, kmsKey, sealedKey, err := S3.ParseMetadata(metadata)
if err != nil {
t.Errorf("Test %d: failed to parse metadata: %v", i, err)
continue
}
if keyID != test.KeyID {
t.Errorf("Test %d: Key-ID mismatch: got '%s' - want '%s'", i, keyID, test.KeyID)
}
if !bytes.Equal(kmsKey, test.SealedDataKey) {
t.Errorf("Test %d: sealed KMS data mismatch: got '%v' - want '%v'", i, kmsKey, test.SealedDataKey)
}
if sealedKey.Algorithm != test.SealedKey.Algorithm {
t.Errorf("Test %d: seal algorithm mismatch: got '%s' - want '%s'", i, sealedKey.Algorithm, test.SealedKey.Algorithm)
}
if !bytes.Equal(sealedKey.IV[:], test.SealedKey.IV[:]) {
t.Errorf("Test %d: IV mismatch: got '%v' - want '%v'", i, sealedKey.IV, test.SealedKey.IV)
}
if !bytes.Equal(sealedKey.Key[:], test.SealedKey.Key[:]) {
t.Errorf("Test %d: sealed key mismatch: got '%v' - want '%v'", i, sealedKey.Key, test.SealedKey.Key)
}
}
defer func() {
if err := recover(); err == nil || err != logger.ErrCritical {
t.Errorf("Expected '%s' panic for invalid seal algorithm but got '%s'", logger.ErrCritical, err)
}
}()
_ = S3.CreateMetadata(nil, "", []byte{}, SealedKey{Algorithm: InsecureSealAlgorithm})
}
var ssecCreateMetadataTests = []SealedKey{
{Algorithm: SealAlgorithm},
{IV: [32]byte{0xff}, Key: [64]byte{0x7e}, Algorithm: SealAlgorithm},
}
func TestSSECCreateMetadata(t *testing.T) {
defer func(disableLog bool) { logger.Disable = disableLog }(logger.Disable)
logger.Disable = true
for i, test := range s3CreateMetadataTests {
metadata := SSEC.CreateMetadata(nil, test.SealedKey)
sealedKey, err := SSEC.ParseMetadata(metadata)
if err != nil {
t.Errorf("Test %d: failed to parse metadata: %v", i, err)
continue
}
if sealedKey.Algorithm != test.SealedKey.Algorithm {
t.Errorf("Test %d: seal algorithm mismatch: got '%s' - want '%s'", i, sealedKey.Algorithm, test.SealedKey.Algorithm)
}
if !bytes.Equal(sealedKey.IV[:], test.SealedKey.IV[:]) {
t.Errorf("Test %d: IV mismatch: got '%v' - want '%v'", i, sealedKey.IV, test.SealedKey.IV)
}
if !bytes.Equal(sealedKey.Key[:], test.SealedKey.Key[:]) {
t.Errorf("Test %d: sealed key mismatch: got '%v' - want '%v'", i, sealedKey.Key, test.SealedKey.Key)
}
}
defer func() {
if err := recover(); err == nil || err != logger.ErrCritical {
t.Errorf("Expected '%s' panic for invalid seal algorithm but got '%s'", logger.ErrCritical, err)
}
}()
_ = SSEC.CreateMetadata(nil, SealedKey{Algorithm: InsecureSealAlgorithm})
}

9
cmd/crypto/sse.go
View File

@ -25,6 +25,11 @@ import (
)
const (
// SSEMultipart is the metadata key indicating that the object
// was uploaded using the S3 multipart API and stored using
// some from of server-side-encryption.
SSEMultipart = "X-Minio-Internal-Encrypted-Multipart"
// SSEIV is the metadata key referencing the random initialization
// vector (IV) used for SSE-S3 and SSE-C key derivation.
SSEIV = "X-Minio-Internal-Server-Side-Encryption-Iv"
@ -33,8 +38,8 @@ const (
// used by SSE-C and SSE-S3 to encrypt the object.
SSESealAlgorithm = "X-Minio-Internal-Server-Side-Encryption-Seal-Algorithm"
// SSECSealKey is the metadata key referencing the sealed object-key for SSE-C.
SSECSealKey = "X-Minio-Internal-Server-Side-Encryption-Sealed-Key"
// SSECSealedKey is the metadata key referencing the sealed object-key for SSE-C.
SSECSealedKey = "X-Minio-Internal-Server-Side-Encryption-Sealed-Key"
// S3SealedKey is the metadata key referencing the sealed object-key for SSE-S3.
S3SealedKey = "X-Minio-Internal-Server-Side-Encryption-S3-Sealed-Key"