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connection_producer.go
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/
connection_producer.go
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package cassandra
import (
"crypto/tls"
"fmt"
"strings"
"sync"
"time"
"github.com/mitchellh/mapstructure"
"github.com/gocql/gocql"
"github.com/hashicorp/vault/helper/certutil"
"github.com/hashicorp/vault/helper/parseutil"
"github.com/hashicorp/vault/helper/tlsutil"
"github.com/hashicorp/vault/plugins/helper/database/connutil"
)
// cassandraConnectionProducer implements ConnectionProducer and provides an
// interface for cassandra databases to make connections.
type cassandraConnectionProducer struct {
Hosts string `json:"hosts" structs:"hosts" mapstructure:"hosts"`
Port int `json:"port" structs:"port" mapstructure:"port"`
Username string `json:"username" structs:"username" mapstructure:"username"`
Password string `json:"password" structs:"password" mapstructure:"password"`
TLS bool `json:"tls" structs:"tls" mapstructure:"tls"`
InsecureTLS bool `json:"insecure_tls" structs:"insecure_tls" mapstructure:"insecure_tls"`
ProtocolVersion int `json:"protocol_version" structs:"protocol_version" mapstructure:"protocol_version"`
ConnectTimeoutRaw interface{} `json:"connect_timeout" structs:"connect_timeout" mapstructure:"connect_timeout"`
TLSMinVersion string `json:"tls_min_version" structs:"tls_min_version" mapstructure:"tls_min_version"`
Consistency string `json:"consistency" structs:"consistency" mapstructure:"consistency"`
PemBundle string `json:"pem_bundle" structs:"pem_bundle" mapstructure:"pem_bundle"`
PemJSON string `json:"pem_json" structs:"pem_json" mapstructure:"pem_json"`
connectTimeout time.Duration
certificate string
privateKey string
issuingCA string
Initialized bool
Type string
session *gocql.Session
sync.Mutex
}
func (c *cassandraConnectionProducer) Initialize(conf map[string]interface{}, verifyConnection bool) error {
c.Lock()
defer c.Unlock()
err := mapstructure.WeakDecode(conf, c)
if err != nil {
return err
}
if c.ConnectTimeoutRaw == nil {
c.ConnectTimeoutRaw = "0s"
}
c.connectTimeout, err = parseutil.ParseDurationSecond(c.ConnectTimeoutRaw)
if err != nil {
return fmt.Errorf("invalid connect_timeout: %s", err)
}
switch {
case len(c.Hosts) == 0:
return fmt.Errorf("hosts cannot be empty")
case len(c.Username) == 0:
return fmt.Errorf("username cannot be empty")
case len(c.Password) == 0:
return fmt.Errorf("password cannot be empty")
}
var certBundle *certutil.CertBundle
var parsedCertBundle *certutil.ParsedCertBundle
switch {
case len(c.PemJSON) != 0:
parsedCertBundle, err = certutil.ParsePKIJSON([]byte(c.PemJSON))
if err != nil {
return fmt.Errorf("could not parse given JSON; it must be in the format of the output of the PKI backend certificate issuing command: %s", err)
}
certBundle, err = parsedCertBundle.ToCertBundle()
if err != nil {
return fmt.Errorf("Error marshaling PEM information: %s", err)
}
c.certificate = certBundle.Certificate
c.privateKey = certBundle.PrivateKey
c.issuingCA = certBundle.IssuingCA
c.TLS = true
case len(c.PemBundle) != 0:
parsedCertBundle, err = certutil.ParsePEMBundle(c.PemBundle)
if err != nil {
return fmt.Errorf("Error parsing the given PEM information: %s", err)
}
certBundle, err = parsedCertBundle.ToCertBundle()
if err != nil {
return fmt.Errorf("Error marshaling PEM information: %s", err)
}
c.certificate = certBundle.Certificate
c.privateKey = certBundle.PrivateKey
c.issuingCA = certBundle.IssuingCA
c.TLS = true
}
// Set initialized to true at this point since all fields are set,
// and the connection can be established at a later time.
c.Initialized = true
if verifyConnection {
if _, err := c.Connection(); err != nil {
return fmt.Errorf("error verifying connection: %s", err)
}
}
return nil
}
func (c *cassandraConnectionProducer) Connection() (interface{}, error) {
if !c.Initialized {
return nil, connutil.ErrNotInitialized
}
// If we already have a DB, return it
if c.session != nil {
return c.session, nil
}
session, err := c.createSession()
if err != nil {
return nil, err
}
// Store the session in backend for reuse
c.session = session
return session, nil
}
func (c *cassandraConnectionProducer) Close() error {
// Grab the write lock
c.Lock()
defer c.Unlock()
if c.session != nil {
c.session.Close()
}
c.session = nil
return nil
}
func (c *cassandraConnectionProducer) createSession() (*gocql.Session, error) {
hosts := strings.Split(c.Hosts, ",")
clusterConfig := gocql.NewCluster(hosts...)
clusterConfig.Authenticator = gocql.PasswordAuthenticator{
Username: c.Username,
Password: c.Password,
}
if c.Port != 0 {
clusterConfig.Port = c.Port
}
clusterConfig.ProtoVersion = c.ProtocolVersion
if clusterConfig.ProtoVersion == 0 {
clusterConfig.ProtoVersion = 2
}
clusterConfig.Timeout = c.connectTimeout
if c.TLS {
var tlsConfig *tls.Config
if len(c.certificate) > 0 || len(c.issuingCA) > 0 {
if len(c.certificate) > 0 && len(c.privateKey) == 0 {
return nil, fmt.Errorf("found certificate for TLS authentication but no private key")
}
certBundle := &certutil.CertBundle{}
if len(c.certificate) > 0 {
certBundle.Certificate = c.certificate
certBundle.PrivateKey = c.privateKey
}
if len(c.issuingCA) > 0 {
certBundle.IssuingCA = c.issuingCA
}
parsedCertBundle, err := certBundle.ToParsedCertBundle()
if err != nil {
return nil, fmt.Errorf("failed to parse certificate bundle: %s", err)
}
tlsConfig, err = parsedCertBundle.GetTLSConfig(certutil.TLSClient)
if err != nil || tlsConfig == nil {
return nil, fmt.Errorf("failed to get TLS configuration: tlsConfig:%#v err:%v", tlsConfig, err)
}
tlsConfig.InsecureSkipVerify = c.InsecureTLS
if c.TLSMinVersion != "" {
var ok bool
tlsConfig.MinVersion, ok = tlsutil.TLSLookup[c.TLSMinVersion]
if !ok {
return nil, fmt.Errorf("invalid 'tls_min_version' in config")
}
} else {
// MinVersion was not being set earlier. Reset it to
// zero to gracefully handle upgrades.
tlsConfig.MinVersion = 0
}
}
clusterConfig.SslOpts = &gocql.SslOptions{
Config: tlsConfig,
}
}
session, err := clusterConfig.CreateSession()
if err != nil {
return nil, fmt.Errorf("error creating session: %s", err)
}
// Set consistency
if c.Consistency != "" {
consistencyValue, err := gocql.ParseConsistencyWrapper(c.Consistency)
if err != nil {
return nil, err
}
session.SetConsistency(consistencyValue)
}
// Verify the info
err = session.Query(`LIST ALL`).Exec()
if err != nil {
return nil, fmt.Errorf("error validating connection info: %s", err)
}
return session, nil
}