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connection_producer.go
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connection_producer.go
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package cassandra
import (
"context"
"crypto/tls"
"fmt"
"strings"
"sync"
"time"
"github.com/hashicorp/vault/sdk/database/helper/connutil"
"github.com/hashicorp/vault/sdk/database/helper/dbutil"
"github.com/hashicorp/vault/sdk/helper/certutil"
"github.com/hashicorp/vault/sdk/helper/parseutil"
"github.com/hashicorp/vault/sdk/helper/tlsutil"
"github.com/gocql/gocql"
dbplugin "github.com/hashicorp/vault/sdk/database/dbplugin/v5"
"github.com/mitchellh/mapstructure"
)
// 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"`
SocketKeepAliveRaw interface{} `json:"socket_keep_alive" structs:"socket_keep_alive" mapstructure:"socket_keep_alive"`
TLSMinVersion string `json:"tls_min_version" structs:"tls_min_version" mapstructure:"tls_min_version"`
Consistency string `json:"consistency" structs:"consistency" mapstructure:"consistency"`
LocalDatacenter string `json:"local_datacenter" structs:"local_datacenter" mapstructure:"local_datacenter"`
PemBundle string `json:"pem_bundle" structs:"pem_bundle" mapstructure:"pem_bundle"`
PemJSON string `json:"pem_json" structs:"pem_json" mapstructure:"pem_json"`
SkipVerification bool `json:"skip_verification" structs:"skip_verification" mapstructure:"skip_verification"`
connectTimeout time.Duration
socketKeepAlive time.Duration
certificate string
privateKey string
issuingCA string
rawConfig map[string]interface{}
Initialized bool
Type string
session *gocql.Session
sync.Mutex
}
func (c *cassandraConnectionProducer) Initialize(ctx context.Context, req dbplugin.InitializeRequest) error {
c.Lock()
defer c.Unlock()
c.rawConfig = req.Config
err := mapstructure.WeakDecode(req.Config, 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: %w", err)
}
if c.SocketKeepAliveRaw == nil {
c.SocketKeepAliveRaw = "0s"
}
c.socketKeepAlive, err = parseutil.ParseDurationSecond(c.SocketKeepAliveRaw)
if err != nil {
return fmt.Errorf("invalid socket_keep_alive: %w", 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: %w", err)
}
certBundle, err = parsedCertBundle.ToCertBundle()
if err != nil {
return fmt.Errorf("error marshaling PEM information: %w", 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: %w", err)
}
certBundle, err = parsedCertBundle.ToCertBundle()
if err != nil {
return fmt.Errorf("error marshaling PEM information: %w", 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 req.VerifyConnection {
if _, err := c.Connection(ctx); err != nil {
return fmt.Errorf("error verifying connection: %w", err)
}
}
return nil
}
func (c *cassandraConnectionProducer) Connection(ctx context.Context) (interface{}, error) {
if !c.Initialized {
return nil, connutil.ErrNotInitialized
}
// If we already have a DB, return it
if c.session != nil && !c.session.Closed() {
return c.session, nil
}
session, err := c.createSession(ctx)
if err != nil {
return nil, err
}
// Store the session in backend for reuse
c.session = session
return session, nil
}
func (c *cassandraConnectionProducer) Close() error {
c.Lock()
defer c.Unlock()
if c.session != nil {
c.session.Close()
}
c.session = nil
return nil
}
func (c *cassandraConnectionProducer) createSession(ctx context.Context) (*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
clusterConfig.SocketKeepalive = c.socketKeepAlive
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: %w", err)
}
tlsConfig, err = parsedCertBundle.GetTLSConfig(certutil.TLSClient)
if err != nil || tlsConfig == nil {
return nil, fmt.Errorf("failed to get TLS configuration: tlsConfig:%#v err:%w", 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,
}
}
if c.LocalDatacenter != "" {
clusterConfig.PoolConfig.HostSelectionPolicy = gocql.DCAwareRoundRobinPolicy(c.LocalDatacenter)
}
session, err := clusterConfig.CreateSession()
if err != nil {
return nil, fmt.Errorf("error creating session: %w", err)
}
if c.Consistency != "" {
consistencyValue, err := gocql.ParseConsistencyWrapper(c.Consistency)
if err != nil {
session.Close()
return nil, err
}
session.SetConsistency(consistencyValue)
}
if !c.SkipVerification {
err = session.Query(`LIST ALL`).WithContext(ctx).Exec()
if err != nil && len(c.Username) != 0 && strings.Contains(err.Error(), "not authorized") {
rowNum := session.Query(dbutil.QueryHelper(`LIST CREATE ON ALL ROLES OF '{{username}}';`, map[string]string{
"username": c.Username,
})).Iter().NumRows()
if rowNum < 1 {
session.Close()
return nil, fmt.Errorf("error validating connection info: No role create permissions found, previous error: %w", err)
}
} else if err != nil {
session.Close()
return nil, fmt.Errorf("error validating connection info: %w", err)
}
}
return session, nil
}
func (c *cassandraConnectionProducer) secretValues() map[string]string {
return map[string]string{
c.Password: "[password]",
c.PemBundle: "[pem_bundle]",
c.PemJSON: "[pem_json]",
}
}