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74 lines
2.3 KiB
Go
74 lines
2.3 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 bootstrap
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import (
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"fmt"
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"strings"
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jose "github.com/square/go-jose"
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)
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// computeDetachedSig takes content and token details and computes a detached
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// JWS signature. This is described in Appendix F of RFC 7515. Basically, this
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// is a regular JWS with the content part of the signature elided.
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func computeDetachedSig(content, tokenID, tokenSecret string) (string, error) {
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jwk := &jose.JsonWebKey{
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Key: []byte(tokenSecret),
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KeyID: tokenID,
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}
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signer, err := jose.NewSigner(jose.HS256, jwk)
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if err != nil {
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return "", fmt.Errorf("can't make a HS256 signer from the given token: %v", err)
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}
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jws, err := signer.Sign([]byte(content))
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if err != nil {
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return "", fmt.Errorf("can't HS256-sign the given token: %v", err)
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}
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fullSig, err := jws.CompactSerialize()
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if err != nil {
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return "", fmt.Errorf("can't serialize the given token: %v", err)
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}
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return stripContent(fullSig)
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}
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// stripContent will remove the content part of a compact JWS
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//
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// The `go-jose` library doesn't support generating signatures with "detatched"
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// content. To make up for this we take the full compact signature, break it
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// apart and put it back together without the content section.
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func stripContent(fullSig string) (string, error) {
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parts := strings.Split(fullSig, ".")
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if len(parts) != 3 {
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return "", fmt.Errorf("compact JWS format must have three parts")
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}
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return parts[0] + ".." + parts[2], nil
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}
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// DetachedTokenIsValid checks whether a given detached JWS-encoded token matches JWS output of the given content and token
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func DetachedTokenIsValid(detachedToken, content, tokenID, tokenSecret string) bool {
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newToken, err := computeDetachedSig(content, tokenID, tokenSecret)
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if err != nil {
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return false
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}
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return detachedToken == newToken
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}
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