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config.go
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config.go
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package kafka
import (
"crypto/tls"
"crypto/x509"
"encoding/pem"
"fmt"
"log"
"os"
"time"
"github.com/IBM/sarama"
)
type Config struct {
BootstrapServers *[]string
Timeout int
CACert string
ClientCert string
ClientCertKey string
ClientCertKeyPassphrase string
TLSEnabled bool
SkipTLSVerify bool
SASLUsername string
SASLPassword string
SASLMechanism string
}
func (c *Config) newKafkaConfig() (*sarama.Config, error) {
kafkaConfig := sarama.NewConfig()
kafkaConfig.Version = sarama.V2_7_0_0
kafkaConfig.ClientID = "terraform-provider-kafka"
kafkaConfig.Admin.Timeout = time.Duration(c.Timeout) * time.Second
kafkaConfig.Metadata.Full = true // the default, but just being clear
kafkaConfig.Metadata.AllowAutoTopicCreation = false
if c.saslEnabled() {
switch c.SASLMechanism {
case "scram-sha512":
kafkaConfig.Net.SASL.SCRAMClientGeneratorFunc = func() sarama.SCRAMClient { return &XDGSCRAMClient{HashGeneratorFcn: SHA512} }
kafkaConfig.Net.SASL.Mechanism = sarama.SASLMechanism(sarama.SASLTypeSCRAMSHA512)
case "scram-sha256":
kafkaConfig.Net.SASL.SCRAMClientGeneratorFunc = func() sarama.SCRAMClient { return &XDGSCRAMClient{HashGeneratorFcn: SHA256} }
kafkaConfig.Net.SASL.Mechanism = sarama.SASLMechanism(sarama.SASLTypeSCRAMSHA256)
case "plain":
default:
log.Fatalf("[ERROR] Invalid sasl mechanism \"%s\": can only be \"scram-sha256\", \"scram-sha512\" or \"plain\"", c.SASLMechanism)
}
kafkaConfig.Net.SASL.Enable = true
kafkaConfig.Net.SASL.Password = c.SASLPassword
kafkaConfig.Net.SASL.User = c.SASLUsername
kafkaConfig.Net.SASL.Handshake = true
} else {
log.Printf("[WARN] SASL disabled username: '%s', password '%s'", c.SASLUsername, "****")
}
if c.TLSEnabled {
tlsConfig, err := newTLSConfig(
c.ClientCert,
c.ClientCertKey,
c.CACert,
c.ClientCertKeyPassphrase,
)
if err != nil {
return kafkaConfig, err
}
kafkaConfig.Net.TLS.Enable = true
kafkaConfig.Net.TLS.Config = tlsConfig
kafkaConfig.Net.TLS.Config.InsecureSkipVerify = c.SkipTLSVerify
}
return kafkaConfig, nil
}
func (c *Config) saslEnabled() bool {
return c.SASLUsername != "" || c.SASLPassword != ""
}
func NewTLSConfig(clientCert, clientKey, caCert, clientKeyPassphrase string) (*tls.Config, error) {
return newTLSConfig(clientCert, clientKey, caCert, clientKeyPassphrase)
}
func parsePemOrLoadFromFile(input string) (*pem.Block, []byte, error) {
// attempt to parse
var inputBytes = []byte(input)
inputBlock, _ := pem.Decode(inputBytes)
if inputBlock == nil {
//attempt to load from file
log.Printf("[INFO] Attempting to load from file '%s'", input)
var err error
inputBytes, err = os.ReadFile(input)
if err != nil {
return nil, nil, err
}
inputBlock, _ = pem.Decode(inputBytes)
if inputBlock == nil {
return nil, nil, fmt.Errorf("[ERROR] Error unable to decode pem")
}
}
return inputBlock, inputBytes, nil
}
func newTLSConfig(clientCert, clientKey, caCert, clientKeyPassphrase string) (*tls.Config, error) {
tlsConfig := tls.Config{}
if clientCert != "" && clientKey != "" {
_, certBytes, err := parsePemOrLoadFromFile(clientCert)
if err != nil {
log.Printf("[ERROR] Unable to read certificate %s", err)
return &tlsConfig, err
}
keyBlock, keyBytes, err := parsePemOrLoadFromFile(clientKey)
if err != nil {
log.Printf("[ERROR] Unable to read private key %s", err)
return &tlsConfig, err
}
if x509.IsEncryptedPEMBlock(keyBlock) { //nolint:staticcheck
log.Printf("[INFO] Using encrypted private key")
var err error
keyBytes, err = x509.DecryptPEMBlock(keyBlock, []byte(clientKeyPassphrase)) //nolint:staticcheck
if err != nil {
log.Printf("[ERROR] Error decrypting private key with passphrase %s", err)
return &tlsConfig, err
}
keyBytes = pem.EncodeToMemory(&pem.Block{
Type: keyBlock.Type,
Bytes: keyBytes,
})
}
cert, err := tls.X509KeyPair(certBytes, keyBytes)
if err != nil {
log.Printf("[ERROR] Error creating X509KeyPair %s", err)
return &tlsConfig, err
}
tlsConfig.Certificates = []tls.Certificate{cert}
}
if caCert == "" {
log.Println("[WARN] no CA file set skipping")
return &tlsConfig, nil
}
caCertPool, _ := x509.SystemCertPool()
if caCertPool == nil {
caCertPool = x509.NewCertPool()
}
_, caBytes, err := parsePemOrLoadFromFile(caCert)
if err != nil {
log.Printf("[ERROR] Unable to read CA %s", err)
return &tlsConfig, err
}
ok := caCertPool.AppendCertsFromPEM(caBytes)
log.Printf("[TRACE] set cert pool %v", ok)
if !ok {
return &tlsConfig, fmt.Errorf("Couldn't add the caPem")
}
tlsConfig.RootCAs = caCertPool
return &tlsConfig, nil
}
func (config *Config) copyWithMaskedSensitiveValues() Config {
copy := Config{
config.BootstrapServers,
config.Timeout,
config.CACert,
config.ClientCert,
"*****",
"*****",
config.TLSEnabled,
config.SkipTLSVerify,
config.SASLUsername,
"*****",
config.SASLMechanism,
}
return copy
}