b181a693fb
This commit fixes a weakness of the key-encryption-key derivation for SSE-C encrypted objects. Before this change the key-encryption-key was not bound to / didn't depend on the object path. This allows an attacker to repalce objects - encrypted with the same client-key - with each other. This change fixes this issue by updating the key-encryption-key derivation to include: - the domain (in this case SSE-C) - a canonical object path representation - the encryption & key derivation algorithm Changing the object path now causes the KDF to derive a different key-encryption-key such that the object-key unsealing fails. Including the domain (SSE-C) and encryption & key derivation algorithm is not directly neccessary for this fix. However, both will be included for the SSE-S3 KDF. So they are included here to avoid updating the KDF again when we add SSE-S3. The leagcy KDF 'DARE-SHA256' is only used for existing objects and never for new objects / key rotation.
507 lines
18 KiB
Go
507 lines
18 KiB
Go
/*
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* Minio Cloud Storage, (C) 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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*/
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package cmd
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import (
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"bytes"
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"net/http"
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"testing"
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)
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var hasSSECopyCustomerHeaderTests = []struct {
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headers map[string]string
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sseRequest bool
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}{
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{headers: map[string]string{SSECopyCustomerAlgorithm: "AES256", SSECopyCustomerKey: "key", SSECopyCustomerKeyMD5: "md5"}, sseRequest: true}, // 0
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{headers: map[string]string{SSECopyCustomerAlgorithm: "AES256"}, sseRequest: true}, // 1
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{headers: map[string]string{SSECopyCustomerKey: "key"}, sseRequest: true}, // 2
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{headers: map[string]string{SSECopyCustomerKeyMD5: "md5"}, sseRequest: true}, // 3
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{headers: map[string]string{}, sseRequest: false}, // 4
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{headers: map[string]string{SSECopyCustomerAlgorithm + " ": "AES256", " " + SSECopyCustomerKey: "key", SSECopyCustomerKeyMD5 + " ": "md5"}, sseRequest: false}, // 5
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{headers: map[string]string{SSECopyCustomerAlgorithm: "", SSECopyCustomerKey: "", SSECopyCustomerKeyMD5: ""}, sseRequest: false}, // 6
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}
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func TestIsSSECopyCustomerRequest(t *testing.T) {
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for i, test := range hasSSECopyCustomerHeaderTests {
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headers := http.Header{}
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for k, v := range test.headers {
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headers.Set(k, v)
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}
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if hasSSECopyCustomerHeader(headers) != test.sseRequest {
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t.Errorf("Test %d: Expected hasSSECopyCustomerHeader to return %v", i, test.sseRequest)
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}
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}
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}
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var hasSSECustomerHeaderTests = []struct {
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headers map[string]string
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sseRequest bool
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}{
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{headers: map[string]string{SSECustomerAlgorithm: "AES256", SSECustomerKey: "key", SSECustomerKeyMD5: "md5"}, sseRequest: true}, // 0
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{headers: map[string]string{SSECustomerAlgorithm: "AES256"}, sseRequest: true}, // 1
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{headers: map[string]string{SSECustomerKey: "key"}, sseRequest: true}, // 2
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{headers: map[string]string{SSECustomerKeyMD5: "md5"}, sseRequest: true}, // 3
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{headers: map[string]string{}, sseRequest: false}, // 4
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{headers: map[string]string{SSECustomerAlgorithm + " ": "AES256", " " + SSECustomerKey: "key", SSECustomerKeyMD5 + " ": "md5"}, sseRequest: false}, // 5
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{headers: map[string]string{SSECustomerAlgorithm: "", SSECustomerKey: "", SSECustomerKeyMD5: ""}, sseRequest: false}, // 6
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}
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func TesthasSSECustomerHeader(t *testing.T) {
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for i, test := range hasSSECustomerHeaderTests {
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headers := http.Header{}
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for k, v := range test.headers {
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headers.Set(k, v)
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}
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if hasSSECustomerHeader(headers) != test.sseRequest {
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t.Errorf("Test %d: Expected hasSSECustomerHeader to return %v", i, test.sseRequest)
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}
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}
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}
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var parseSSECustomerRequestTests = []struct {
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headers map[string]string
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useTLS bool
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err error
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}{
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{
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headers: map[string]string{
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SSECustomerAlgorithm: "AES256",
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SSECustomerKey: "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 0
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SSECustomerKeyMD5: "bY4wkxQejw9mUJfo72k53A==",
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},
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useTLS: true, err: nil,
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},
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{
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headers: map[string]string{
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SSECustomerAlgorithm: "AES256",
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SSECustomerKey: "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 1
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SSECustomerKeyMD5: "bY4wkxQejw9mUJfo72k53A==",
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},
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useTLS: false, err: errInsecureSSERequest,
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},
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{
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headers: map[string]string{
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SSECustomerAlgorithm: "AES 256",
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SSECustomerKey: "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 2
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SSECustomerKeyMD5: "bY4wkxQejw9mUJfo72k53A==",
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},
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useTLS: true, err: errInvalidSSEAlgorithm,
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},
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{
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headers: map[string]string{
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SSECustomerAlgorithm: "AES256",
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SSECustomerKey: "NjE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 3
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SSECustomerKeyMD5: "H+jq/LwEOEO90YtiTuNFVw==",
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},
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useTLS: true, err: errSSEKeyMD5Mismatch,
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},
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{
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headers: map[string]string{
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SSECustomerAlgorithm: "AES256",
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SSECustomerKey: " jE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 4
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SSECustomerKeyMD5: "H+jq/LwEOEO90YtiTuNFVw==",
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},
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useTLS: true, err: errInvalidSSEKey,
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},
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{
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headers: map[string]string{
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SSECustomerAlgorithm: "AES256",
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SSECustomerKey: "NjE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 5
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SSECustomerKeyMD5: " +jq/LwEOEO90YtiTuNFVw==",
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},
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useTLS: true, err: errSSEKeyMD5Mismatch,
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},
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{
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headers: map[string]string{
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SSECustomerAlgorithm: "AES256",
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SSECustomerKey: "vFQ9ScFOF6Tu/BfzMS+rVMvlZGJHi5HmGJenJfrfKI45", // 6
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SSECustomerKeyMD5: "9KPgDdZNTHimuYCwnJTp5g==",
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},
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useTLS: true, err: errInvalidSSEKey,
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},
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{
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headers: map[string]string{
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SSECustomerAlgorithm: "AES256",
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SSECustomerKey: "", // 7
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SSECustomerKeyMD5: "9KPgDdZNTHimuYCwnJTp5g==",
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},
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useTLS: true, err: errMissingSSEKey,
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},
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{
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headers: map[string]string{
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SSECustomerAlgorithm: "AES256",
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SSECustomerKey: "vFQ9ScFOF6Tu/BfzMS+rVMvlZGJHi5HmGJenJfrfKI45", // 8
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SSECustomerKeyMD5: "",
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},
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useTLS: true, err: errMissingSSEKeyMD5,
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},
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}
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func TestParseSSECustomerRequest(t *testing.T) {
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defer func(flag bool) { globalIsSSL = flag }(globalIsSSL)
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for i, test := range parseSSECustomerRequestTests {
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headers := http.Header{}
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for k, v := range test.headers {
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headers.Set(k, v)
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}
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request := &http.Request{}
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request.Header = headers
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globalIsSSL = test.useTLS
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_, err := ParseSSECustomerRequest(request)
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if err != test.err {
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t.Errorf("Test %d: Parse returned: %v want: %v", i, err, test.err)
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}
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key := request.Header.Get(SSECustomerKey)
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if (err == nil || err == errSSEKeyMD5Mismatch) && key != "" {
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t.Errorf("Test %d: Client key survived parsing - found key: %v", i, key)
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}
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}
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}
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var parseSSECopyCustomerRequestTests = []struct {
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headers map[string]string
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useTLS bool
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err error
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}{
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{
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headers: map[string]string{
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SSECopyCustomerAlgorithm: "AES256",
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SSECopyCustomerKey: "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 0
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SSECopyCustomerKeyMD5: "bY4wkxQejw9mUJfo72k53A==",
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},
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useTLS: true, err: nil,
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},
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{
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headers: map[string]string{
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SSECopyCustomerAlgorithm: "AES256",
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SSECopyCustomerKey: "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 1
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SSECopyCustomerKeyMD5: "bY4wkxQejw9mUJfo72k53A==",
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},
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useTLS: false, err: errInsecureSSERequest,
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},
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{
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headers: map[string]string{
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SSECopyCustomerAlgorithm: "AES 256",
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SSECopyCustomerKey: "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 2
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SSECopyCustomerKeyMD5: "bY4wkxQejw9mUJfo72k53A==",
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},
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useTLS: true, err: errInvalidSSEAlgorithm,
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},
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{
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headers: map[string]string{
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SSECopyCustomerAlgorithm: "AES256",
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SSECopyCustomerKey: "NjE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 3
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SSECopyCustomerKeyMD5: "H+jq/LwEOEO90YtiTuNFVw==",
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},
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useTLS: true, err: errSSEKeyMD5Mismatch,
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},
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{
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headers: map[string]string{
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SSECopyCustomerAlgorithm: "AES256",
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SSECopyCustomerKey: " jE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 4
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SSECopyCustomerKeyMD5: "H+jq/LwEOEO90YtiTuNFVw==",
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},
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useTLS: true, err: errInvalidSSEKey,
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},
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{
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headers: map[string]string{
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SSECopyCustomerAlgorithm: "AES256",
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SSECopyCustomerKey: "NjE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 5
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SSECopyCustomerKeyMD5: " +jq/LwEOEO90YtiTuNFVw==",
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},
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useTLS: true, err: errSSEKeyMD5Mismatch,
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},
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{
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headers: map[string]string{
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SSECopyCustomerAlgorithm: "AES256",
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SSECopyCustomerKey: "vFQ9ScFOF6Tu/BfzMS+rVMvlZGJHi5HmGJenJfrfKI45", // 6
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SSECopyCustomerKeyMD5: "9KPgDdZNTHimuYCwnJTp5g==",
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},
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useTLS: true, err: errInvalidSSEKey,
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},
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{
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headers: map[string]string{
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SSECopyCustomerAlgorithm: "AES256",
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SSECopyCustomerKey: "", // 7
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SSECopyCustomerKeyMD5: "9KPgDdZNTHimuYCwnJTp5g==",
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},
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useTLS: true, err: errMissingSSEKey,
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},
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{
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headers: map[string]string{
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SSECopyCustomerAlgorithm: "AES256",
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SSECopyCustomerKey: "vFQ9ScFOF6Tu/BfzMS+rVMvlZGJHi5HmGJenJfrfKI45", // 8
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SSECopyCustomerKeyMD5: "",
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},
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useTLS: true, err: errMissingSSEKeyMD5,
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},
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}
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func TestParseSSECopyCustomerRequest(t *testing.T) {
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defer func(flag bool) { globalIsSSL = flag }(globalIsSSL)
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for i, test := range parseSSECopyCustomerRequestTests {
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headers := http.Header{}
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for k, v := range test.headers {
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headers.Set(k, v)
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}
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request := &http.Request{}
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request.Header = headers
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globalIsSSL = test.useTLS
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_, err := ParseSSECopyCustomerRequest(request)
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if err != test.err {
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t.Errorf("Test %d: Parse returned: %v want: %v", i, err, test.err)
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}
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key := request.Header.Get(SSECopyCustomerKey)
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if (err == nil || err == errSSEKeyMD5Mismatch) && key != "" {
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t.Errorf("Test %d: Client key survived parsing - found key: %v", i, key)
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}
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}
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}
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var encryptRequestTests = []struct {
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header map[string]string
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metadata map[string]string
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}{
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{
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header: map[string]string{
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SSECustomerAlgorithm: "AES256",
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SSECustomerKey: "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
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SSECustomerKeyMD5: "bY4wkxQejw9mUJfo72k53A==",
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},
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metadata: map[string]string{},
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},
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{
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header: map[string]string{
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SSECustomerAlgorithm: "AES256",
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SSECustomerKey: "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
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SSECustomerKeyMD5: "bY4wkxQejw9mUJfo72k53A==",
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},
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metadata: map[string]string{
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SSECustomerKey: "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
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},
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},
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}
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func TestEncryptRequest(t *testing.T) {
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defer func(flag bool) { globalIsSSL = flag }(globalIsSSL)
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globalIsSSL = true
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for i, test := range encryptRequestTests {
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content := bytes.NewReader(make([]byte, 64))
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req := &http.Request{Header: http.Header{}}
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for k, v := range test.header {
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req.Header.Set(k, v)
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}
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_, err := EncryptRequest(content, req, "bucket", "object", test.metadata)
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if err != nil {
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t.Fatalf("Test %d: Failed to encrypt request: %v", i, err)
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}
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if key, ok := test.metadata[SSECustomerKey]; ok {
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t.Errorf("Test %d: Client provided key survived in metadata - key: %s", i, key)
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}
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if kdf, ok := test.metadata[ServerSideEncryptionSealAlgorithm]; !ok {
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t.Errorf("Test %d: ServerSideEncryptionKDF must be part of metadata: %v", i, kdf)
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}
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if iv, ok := test.metadata[ServerSideEncryptionIV]; !ok {
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t.Errorf("Test %d: ServerSideEncryptionIV must be part of metadata: %v", i, iv)
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}
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if mac, ok := test.metadata[ServerSideEncryptionSealedKey]; !ok {
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t.Errorf("Test %d: ServerSideEncryptionKeyMAC must be part of metadata: %v", i, mac)
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}
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}
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}
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var decryptRequestTests = []struct {
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bucket, object string
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header map[string]string
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metadata map[string]string
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shouldFail bool
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}{
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{
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bucket: "bucket",
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object: "object",
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header: map[string]string{
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SSECustomerAlgorithm: "AES256",
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SSECustomerKey: "MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ=",
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SSECustomerKeyMD5: "7PpPLAK26ONlVUGOWlusfg==",
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},
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metadata: map[string]string{
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ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareSha256,
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ServerSideEncryptionIV: "7nQqotA8xgrPx6QK7Ap3GCfjKitqJSrGP7xzgErSJlw=",
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ServerSideEncryptionSealedKey: "EAAfAAAAAAD7v1hQq3PFRUHsItalxmrJqrOq6FwnbXNarxOOpb8jTWONPPKyM3Gfjkjyj6NCf+aB/VpHCLCTBA==",
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},
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shouldFail: false,
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},
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{
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bucket: "bucket",
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object: "object",
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header: map[string]string{
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SSECustomerAlgorithm: "AES256",
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SSECustomerKey: "MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ=",
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SSECustomerKeyMD5: "7PpPLAK26ONlVUGOWlusfg==",
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},
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metadata: map[string]string{
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ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareV2HmacSha256,
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ServerSideEncryptionIV: "qEqmsONcorqlcZXJxaw32H04eyXyXwUgjHzlhkaIYrU=",
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ServerSideEncryptionSealedKey: "IAAfAIM14ugTGcM/dIrn4iQMrkl1sjKyeBQ8FBEvRebYj8vWvxG+0cJRpC6NXRU1wJN50JaUOATjO7kz0wZ2mA==",
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},
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shouldFail: false,
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},
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{
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bucket: "bucket",
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object: "object",
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header: map[string]string{
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SSECustomerAlgorithm: "AES256",
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SSECustomerKey: "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
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SSECustomerKeyMD5: "bY4wkxQejw9mUJfo72k53A==",
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},
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metadata: map[string]string{
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ServerSideEncryptionSealAlgorithm: "HMAC-SHA3",
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ServerSideEncryptionIV: "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
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ServerSideEncryptionSealedKey: "SY5E9AvI2tI7/nUrUAssIGE32Hcs4rR9z/CUuPqu5N4=",
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},
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shouldFail: true,
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},
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{
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bucket: "bucket",
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object: "object",
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header: map[string]string{
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SSECustomerAlgorithm: "AES256",
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SSECustomerKey: "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
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SSECustomerKeyMD5: "bY4wkxQejw9mUJfo72k53A==",
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},
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metadata: map[string]string{
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ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareSha256,
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ServerSideEncryptionIV: "RrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
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ServerSideEncryptionSealedKey: "SY5E9AvI2tI7/nUrUAssIGE32Hcs4rR9z/CUuPqu5N4=",
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},
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shouldFail: true,
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},
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{
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bucket: "bucket",
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object: "object",
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header: map[string]string{
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SSECustomerAlgorithm: "AES256",
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SSECustomerKey: "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
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SSECustomerKeyMD5: "bY4wkxQejw9mUJfo72k53A==",
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},
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metadata: map[string]string{
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ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareSha256,
|
|
ServerSideEncryptionIV: "XAm0dRrJsEsyPb1UuFNezv1bl9ehxuYsgUVC/MUctE2k=",
|
|
ServerSideEncryptionSealedKey: "SY5E9AvI2tI7/nUrUAssIGE32Hds4rR9z/CUuPqu5N4=",
|
|
},
|
|
shouldFail: true,
|
|
},
|
|
{
|
|
bucket: "bucket",
|
|
object: "object-2",
|
|
header: map[string]string{
|
|
SSECustomerAlgorithm: "AES256",
|
|
SSECustomerKey: "MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ=",
|
|
SSECustomerKeyMD5: "7PpPLAK26ONlVUGOWlusfg==",
|
|
},
|
|
metadata: map[string]string{
|
|
ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareV2HmacSha256,
|
|
ServerSideEncryptionIV: "qEqmsONcorqlcZXJxaw32H04eyXyXwUgjHzlhkaIYrU=",
|
|
ServerSideEncryptionSealedKey: "IAAfAIM14ugTGcM/dIrn4iQMrkl1sjKyeBQ8FBEvRebYj8vWvxG+0cJRpC6NXRU1wJN50JaUOATjO7kz0wZ2mA==",
|
|
},
|
|
shouldFail: true,
|
|
},
|
|
}
|
|
|
|
func TestDecryptRequest(t *testing.T) {
|
|
defer func(flag bool) { globalIsSSL = flag }(globalIsSSL)
|
|
globalIsSSL = true
|
|
for i, test := range decryptRequestTests[1:] {
|
|
client := bytes.NewBuffer(nil)
|
|
req := &http.Request{Header: http.Header{}}
|
|
for k, v := range test.header {
|
|
req.Header.Set(k, v)
|
|
}
|
|
_, err := DecryptRequest(client, req, test.bucket, test.object, test.metadata)
|
|
if err != nil && !test.shouldFail {
|
|
t.Fatalf("Test %d: Failed to encrypt request: %v", i, err)
|
|
}
|
|
if err == nil && test.shouldFail {
|
|
t.Fatalf("Test %d: should fail but passed", i)
|
|
}
|
|
if key, ok := test.metadata[SSECustomerKey]; ok {
|
|
t.Errorf("Test %d: Client provided key survived in metadata - key: %s", i, key)
|
|
}
|
|
if kdf, ok := test.metadata[ServerSideEncryptionSealAlgorithm]; ok && !test.shouldFail {
|
|
t.Errorf("Test %d: ServerSideEncryptionKDF should not be part of metadata: %v", i, kdf)
|
|
}
|
|
if iv, ok := test.metadata[ServerSideEncryptionIV]; ok && !test.shouldFail {
|
|
t.Errorf("Test %d: ServerSideEncryptionIV should not be part of metadata: %v", i, iv)
|
|
}
|
|
if mac, ok := test.metadata[ServerSideEncryptionSealedKey]; ok && !test.shouldFail {
|
|
t.Errorf("Test %d: ServerSideEncryptionKeyMAC should not be part of metadata: %v", i, mac)
|
|
}
|
|
}
|
|
}
|
|
|
|
var decryptObjectInfoTests = []struct {
|
|
info ObjectInfo
|
|
headers http.Header
|
|
expErr APIErrorCode
|
|
}{
|
|
{
|
|
info: ObjectInfo{Size: 100},
|
|
headers: http.Header{},
|
|
expErr: ErrNone,
|
|
},
|
|
{
|
|
info: ObjectInfo{Size: 100, UserDefined: map[string]string{ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareSha256}},
|
|
headers: http.Header{SSECustomerAlgorithm: []string{SSECustomerAlgorithmAES256}},
|
|
expErr: ErrNone,
|
|
},
|
|
{
|
|
info: ObjectInfo{Size: 0, UserDefined: map[string]string{ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareSha256}},
|
|
headers: http.Header{SSECustomerAlgorithm: []string{SSECustomerAlgorithmAES256}},
|
|
expErr: ErrNone,
|
|
},
|
|
{
|
|
info: ObjectInfo{Size: 100, UserDefined: map[string]string{ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareSha256}},
|
|
headers: http.Header{},
|
|
expErr: ErrSSEEncryptedObject,
|
|
},
|
|
{
|
|
info: ObjectInfo{Size: 100, UserDefined: map[string]string{}},
|
|
headers: http.Header{SSECustomerAlgorithm: []string{SSECustomerAlgorithmAES256}},
|
|
expErr: ErrInvalidEncryptionParameters,
|
|
},
|
|
{
|
|
info: ObjectInfo{Size: 31, UserDefined: map[string]string{ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareSha256}},
|
|
headers: http.Header{SSECustomerAlgorithm: []string{SSECustomerAlgorithmAES256}},
|
|
expErr: ErrObjectTampered,
|
|
},
|
|
}
|
|
|
|
func TestDecryptObjectInfo(t *testing.T) {
|
|
for i, test := range decryptObjectInfoTests {
|
|
if err, encrypted := DecryptObjectInfo(&test.info, test.headers); err != test.expErr {
|
|
t.Errorf("Test %d: Decryption returned wrong error code: got %d , want %d", i, err, test.expErr)
|
|
} else if enc := test.info.IsEncrypted(); encrypted && enc != encrypted {
|
|
t.Errorf("Test %d: Decryption thinks object is encrypted but it is not", i)
|
|
} else if !encrypted && enc != encrypted {
|
|
t.Errorf("Test %d: Decryption thinks object is not encrypted but it is", i)
|
|
}
|
|
}
|
|
}
|