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auth.go
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auth.go
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/*
Copyright 2021 The Dapr Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package kafka
import (
"context"
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"time"
"github.com/IBM/sarama"
"github.com/aws/aws-msk-iam-sasl-signer-go/signer"
aws2 "github.com/aws/aws-sdk-go-v2/aws"
)
func updatePasswordAuthInfo(config *sarama.Config, metadata *KafkaMetadata, saslUsername, saslPassword string) {
config.Net.SASL.Enable = true
config.Net.SASL.User = saslUsername
config.Net.SASL.Password = saslPassword
if metadata.SaslMechanism == "SHA-256" {
config.Net.SASL.SCRAMClientGeneratorFunc = func() sarama.SCRAMClient { return &XDGSCRAMClient{HashGeneratorFcn: SHA256} }
config.Net.SASL.Mechanism = sarama.SASLTypeSCRAMSHA256
} else if metadata.SaslMechanism == "SHA-512" {
config.Net.SASL.SCRAMClientGeneratorFunc = func() sarama.SCRAMClient { return &XDGSCRAMClient{HashGeneratorFcn: SHA512} }
config.Net.SASL.Mechanism = sarama.SASLTypeSCRAMSHA512
} else {
config.Net.SASL.Mechanism = sarama.SASLTypePlaintext
}
}
func updateMTLSAuthInfo(config *sarama.Config, metadata *KafkaMetadata) error {
if metadata.TLSDisable {
return fmt.Errorf("kafka: cannot configure mTLS authentication when TLSDisable is 'true'")
}
cert, err := tls.X509KeyPair([]byte(metadata.TLSClientCert), []byte(metadata.TLSClientKey))
if err != nil {
return fmt.Errorf("unable to load client certificate and key pair. Err: %w", err)
}
config.Net.TLS.Config.Certificates = []tls.Certificate{cert}
return nil
}
func updateTLSConfig(config *sarama.Config, metadata *KafkaMetadata) error {
if metadata.TLSDisable || metadata.AuthType == noAuthType {
config.Net.TLS.Enable = false
return nil
}
config.Net.TLS.Enable = true
if !metadata.TLSSkipVerify && metadata.TLSCaCert == "" {
return nil
}
//nolint:gosec
config.Net.TLS.Config = &tls.Config{InsecureSkipVerify: metadata.TLSSkipVerify, MinVersion: tls.VersionTLS12}
if metadata.TLSCaCert != "" {
caCertPool := x509.NewCertPool()
if ok := caCertPool.AppendCertsFromPEM([]byte(metadata.TLSCaCert)); !ok {
return errors.New("kafka error: unable to load ca certificate")
}
config.Net.TLS.Config.RootCAs = caCertPool
}
return nil
}
func updateOidcAuthInfo(config *sarama.Config, metadata *KafkaMetadata) error {
tokenProvider := metadata.getOAuthTokenSource()
if metadata.TLSCaCert != "" {
err := tokenProvider.addCa(metadata.TLSCaCert)
if err != nil {
return fmt.Errorf("kafka: error setting oauth client trusted CA: %w", err)
}
}
config.Net.SASL.Enable = true
config.Net.SASL.Mechanism = sarama.SASLTypeOAuth
config.Net.SASL.TokenProvider = tokenProvider
return nil
}
func updateAWSIAMAuthInfo(ctx context.Context, config *sarama.Config, metadata *KafkaMetadata) error {
config.Net.SASL.Enable = true
config.Net.SASL.Mechanism = sarama.SASLTypeOAuth
config.Net.SASL.TokenProvider = &mskAccessTokenProvider{
ctx: ctx,
generateTokenTimeout: 10 * time.Second,
region: metadata.AWSRegion,
accessKey: metadata.AWSAccessKey,
secretKey: metadata.AWSSecretKey,
sessionToken: metadata.AWSSessionToken,
awsIamRoleArn: metadata.AWSIamRoleArn,
awsStsSessionName: metadata.AWSStsSessionName,
}
_, err := config.Net.SASL.TokenProvider.Token()
if err != nil {
return fmt.Errorf("error validating iam credentials %v", err)
}
return nil
}
type mskAccessTokenProvider struct {
ctx context.Context
generateTokenTimeout time.Duration
accessKey string
secretKey string
sessionToken string
awsIamRoleArn string
awsStsSessionName string
region string
}
func (m *mskAccessTokenProvider) Token() (*sarama.AccessToken, error) {
// this function can't use the context passed on Init because that context would be cancelled right after Init
ctx, cancel := context.WithTimeout(m.ctx, m.generateTokenTimeout)
defer cancel()
if m.accessKey != "" && m.secretKey != "" {
token, _, err := signer.GenerateAuthTokenFromCredentialsProvider(ctx, m.region, aws2.CredentialsProviderFunc(func(ctx context.Context) (aws2.Credentials, error) {
return aws2.Credentials{
AccessKeyID: m.accessKey,
SecretAccessKey: m.secretKey,
SessionToken: m.sessionToken,
}, nil
}))
return &sarama.AccessToken{Token: token}, err
} else if m.awsIamRoleArn != "" {
token, _, err := signer.GenerateAuthTokenFromRole(ctx, m.region, m.awsIamRoleArn, m.awsStsSessionName)
return &sarama.AccessToken{Token: token}, err
}
token, _, err := signer.GenerateAuthToken(ctx, m.region)
return &sarama.AccessToken{Token: token}, err
}