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84 lines
3.1 KiB
Go
84 lines
3.1 KiB
Go
/*
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* MinIO Object Storage (c) 2021 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 target
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import (
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"crypto/sha256"
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"crypto/sha512"
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"github.com/Shopify/sarama"
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"github.com/xdg/scram"
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)
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func initScramClient(args KafkaArgs, config *sarama.Config) {
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if args.SASL.Mechanism == "sha512" {
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config.Net.SASL.SCRAMClientGeneratorFunc = func() sarama.SCRAMClient { return &XDGSCRAMClient{HashGeneratorFcn: KafkaSHA512} }
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config.Net.SASL.Mechanism = sarama.SASLMechanism(sarama.SASLTypeSCRAMSHA512)
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} else if args.SASL.Mechanism == "sha256" {
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config.Net.SASL.SCRAMClientGeneratorFunc = func() sarama.SCRAMClient { return &XDGSCRAMClient{HashGeneratorFcn: KafkaSHA256} }
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config.Net.SASL.Mechanism = sarama.SASLMechanism(sarama.SASLTypeSCRAMSHA256)
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} else {
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// default to PLAIN
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config.Net.SASL.Mechanism = sarama.SASLMechanism(sarama.SASLTypePlaintext)
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}
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}
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// KafkaSHA256 is a function that returns a crypto/sha256 hasher and should be used
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// to create Client objects configured for SHA-256 hashing.
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var KafkaSHA256 scram.HashGeneratorFcn = sha256.New
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// KafkaSHA512 is a function that returns a crypto/sha512 hasher and should be used
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// to create Client objects configured for SHA-512 hashing.
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var KafkaSHA512 scram.HashGeneratorFcn = sha512.New
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// XDGSCRAMClient implements the client-side of an authentication
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// conversation with a server. A new conversation must be created for
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// each authentication attempt.
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type XDGSCRAMClient struct {
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*scram.Client
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*scram.ClientConversation
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scram.HashGeneratorFcn
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}
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// Begin constructs a SCRAM client component based on a given hash.Hash
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// factory receiver. This constructor will normalize the username, password
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// and authzID via the SASLprep algorithm, as recommended by RFC-5802. If
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// SASLprep fails, the method returns an error.
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func (x *XDGSCRAMClient) Begin(userName, password, authzID string) (err error) {
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x.Client, err = x.HashGeneratorFcn.NewClient(userName, password, authzID)
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if err != nil {
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return err
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}
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x.ClientConversation = x.Client.NewConversation()
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return nil
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}
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// Step takes a string provided from a server (or just an empty string for the
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// very first conversation step) and attempts to move the authentication
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// conversation forward. It returns a string to be sent to the server or an
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// error if the server message is invalid. Calling Step after a conversation
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// completes is also an error.
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func (x *XDGSCRAMClient) Step(challenge string) (response string, err error) {
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response, err = x.ClientConversation.Step(challenge)
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return
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}
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// Done returns true if the conversation is completed or has errored.
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func (x *XDGSCRAMClient) Done() bool {
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return x.ClientConversation.Done()
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}
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