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scram_client.go
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scram_client.go
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// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package authorization
import (
"crypto/sha256"
"crypto/sha512"
"hash"
"github.com/xdg/scram"
)
// NOTE: the code is copied from https://github.com/Shopify/sarama/blob/master/examples/sasl_scram_client/scram_client.go
// SHA256 algorithm
var SHA256 scram.HashGeneratorFcn = func() hash.Hash { return sha256.New() }
// SHA512 algorithm
var SHA512 scram.HashGeneratorFcn = func() hash.Hash { return sha512.New() }
// XDGSCRAMClient is the scram client
type XDGSCRAMClient struct {
*scram.Client
*scram.ClientConversation
scram.HashGeneratorFcn
}
// Begin creates new client
func (x *XDGSCRAMClient) Begin(userName, password, authzID string) (err error) {
x.Client, err = x.HashGeneratorFcn.NewClient(userName, password, authzID)
if err != nil {
return err
}
x.ClientConversation = x.Client.NewConversation()
return nil
}
// Step takes a string provided from a server (or just an empty string for the
// very first conversation step) and attempts to move the authentication
// conversation forward. It returns a string to be sent to the server or an
// error if the server message is invalid. Calling Step after a conversation
// completes is also an error.
func (x *XDGSCRAMClient) Step(challenge string) (response string, err error) {
response, err = x.ClientConversation.Step(challenge)
return
}
// Done stops the client
func (x *XDGSCRAMClient) Done() bool {
return x.ClientConversation.Done()
}