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87 lines
2.9 KiB
Go
87 lines
2.9 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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"bytes"
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"crypto/md5"
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"encoding/base64"
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"net/http"
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xhttp "github.com/minio/minio/cmd/http"
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)
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// RemoveSensitiveHeaders removes confidential encryption
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// information - e.g. the SSE-C key - from the HTTP headers.
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// It has the same semantics as RemoveSensitiveEntires.
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func RemoveSensitiveHeaders(h http.Header) {
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h.Del(xhttp.AmzServerSideEncryptionCustomerKey)
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h.Del(xhttp.AmzServerSideEncryptionCopyCustomerKey)
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h.Del(xhttp.AmzMetaUnencryptedContentLength)
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h.Del(xhttp.AmzMetaUnencryptedContentMD5)
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}
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var (
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// SSECopy represents AWS SSE-C for copy requests. It provides
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// functionality to handle SSE-C copy requests.
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SSECopy = ssecCopy{}
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)
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type ssecCopy struct{}
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// IsRequested returns true if the HTTP headers contains
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// at least one SSE-C copy header. Regular SSE-C headers
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// are ignored.
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func (ssecCopy) IsRequested(h http.Header) bool {
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if _, ok := h[xhttp.AmzServerSideEncryptionCopyCustomerAlgorithm]; ok {
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return true
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}
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if _, ok := h[xhttp.AmzServerSideEncryptionCopyCustomerKey]; ok {
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return true
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}
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if _, ok := h[xhttp.AmzServerSideEncryptionCopyCustomerKeyMD5]; 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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// ParseHTTP parses the SSE-C copy headers and returns the SSE-C client key
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// on success. Regular SSE-C headers are ignored.
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func (ssecCopy) ParseHTTP(h http.Header) (key [32]byte, err error) {
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if h.Get(xhttp.AmzServerSideEncryptionCopyCustomerAlgorithm) != xhttp.AmzEncryptionAES {
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return key, ErrInvalidCustomerAlgorithm
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}
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if h.Get(xhttp.AmzServerSideEncryptionCopyCustomerKey) == "" {
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return key, ErrMissingCustomerKey
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}
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if h.Get(xhttp.AmzServerSideEncryptionCopyCustomerKeyMD5) == "" {
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return key, ErrMissingCustomerKeyMD5
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}
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clientKey, err := base64.StdEncoding.DecodeString(h.Get(xhttp.AmzServerSideEncryptionCopyCustomerKey))
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if err != nil || len(clientKey) != 32 { // The client key must be 256 bits long
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return key, ErrInvalidCustomerKey
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}
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keyMD5, err := base64.StdEncoding.DecodeString(h.Get(xhttp.AmzServerSideEncryptionCopyCustomerKeyMD5))
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if md5Sum := md5.Sum(clientKey); err != nil || !bytes.Equal(md5Sum[:], keyMD5) {
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return key, ErrCustomerKeyMD5Mismatch
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}
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copy(key[:], clientKey)
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return key, nil
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}
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