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113 lines
3.2 KiB
Go
113 lines
3.2 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package cmd
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import (
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"encoding/xml"
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"errors"
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"io"
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)
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const (
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// AES256 is used with SSE-S3
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AES256 SSEAlgorithm = "AES256"
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// AWSKms is used with SSE-KMS
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AWSKms SSEAlgorithm = "aws:kms"
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)
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// SSEAlgorithm - represents valid SSE algorithms supported; currently only AES256 is supported
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type SSEAlgorithm string
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// UnmarshalXML - Unmarshals XML tag to valid SSE algorithm
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func (alg *SSEAlgorithm) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
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var s string
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if err := d.DecodeElement(&s, &start); err != nil {
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return err
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}
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switch s {
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case string(AES256):
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*alg = AES256
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case string(AWSKms):
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*alg = AWSKms
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default:
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return errors.New("Unknown SSE algorithm")
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}
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return nil
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}
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// MarshalXML - Marshals given SSE algorithm to valid XML
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func (alg *SSEAlgorithm) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
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return e.EncodeElement(string(*alg), start)
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}
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// EncryptionAction - for ApplyServerSideEncryptionByDefault XML tag
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type EncryptionAction struct {
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Algorithm SSEAlgorithm `xml:"SSEAlgorithm,omitempty"`
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MasterKeyID string `xml:"KMSMasterKeyID,omitempty"`
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}
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// SSERule - for ServerSideEncryptionConfiguration XML tag
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type SSERule struct {
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DefaultEncryptionAction EncryptionAction `xml:"ApplyServerSideEncryptionByDefault"`
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}
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const xmlNS = "http://s3.amazonaws.com/doc/2006-03-01/"
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// BucketSSEConfig - represents default bucket encryption configuration
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type BucketSSEConfig struct {
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XMLNS string `xml:"xmlns,attr,omitempty"`
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XMLName xml.Name `xml:"ServerSideEncryptionConfiguration"`
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Rules []SSERule `xml:"Rule"`
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}
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// ParseBucketSSEConfig - Decodes given XML to a valid default bucket encryption config
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func ParseBucketSSEConfig(r io.Reader) (*BucketSSEConfig, error) {
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var config BucketSSEConfig
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err := xml.NewDecoder(r).Decode(&config)
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if err != nil {
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return nil, err
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}
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// Validates server-side encryption config rules
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// Only one rule is allowed on AWS S3
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if len(config.Rules) != 1 {
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return nil, errors.New("only one server-side encryption rule is allowed at a time")
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}
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for _, rule := range config.Rules {
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switch rule.DefaultEncryptionAction.Algorithm {
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case AES256:
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if rule.DefaultEncryptionAction.MasterKeyID != "" {
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return nil, errors.New("MasterKeyID is allowed with aws:kms only")
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}
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case AWSKms:
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if rule.DefaultEncryptionAction.MasterKeyID == "" {
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return nil, errors.New("MasterKeyID is missing with aws:kms")
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}
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}
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}
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if config.XMLNS == "" {
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config.XMLNS = xmlNS
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}
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return &config, nil
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}
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