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cassandra.go
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cassandra.go
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package cassandra
import (
"context"
"fmt"
"strings"
"github.com/hashicorp/vault/sdk/helper/template"
"github.com/gocql/gocql"
multierror "github.com/hashicorp/go-multierror"
dbplugin "github.com/hashicorp/vault/sdk/database/dbplugin/v5"
"github.com/hashicorp/vault/sdk/database/helper/dbutil"
"github.com/hashicorp/vault/sdk/helper/strutil"
)
const (
defaultUserCreationCQL = `CREATE USER '{{username}}' WITH PASSWORD '{{password}}' NOSUPERUSER;`
defaultUserDeletionCQL = `DROP USER '{{username}}';`
defaultChangePasswordCQL = `ALTER USER {{username}} WITH PASSWORD '{{password}}';`
cassandraTypeName = "cassandra"
defaultUserNameTemplate = `{{ printf "v_%s_%s_%s_%s" (.DisplayName | truncate 15) (.RoleName | truncate 15) (random 20) (unix_time) | truncate 100 | replace "-" "_" | lowercase }}`
)
var _ dbplugin.Database = &Cassandra{}
// Cassandra is an implementation of Database interface
type Cassandra struct {
*cassandraConnectionProducer
usernameProducer template.StringTemplate
}
// New returns a new Cassandra instance
func New() (interface{}, error) {
db := new()
dbType := dbplugin.NewDatabaseErrorSanitizerMiddleware(db, db.secretValues)
return dbType, nil
}
func new() *Cassandra {
connProducer := &cassandraConnectionProducer{}
connProducer.Type = cassandraTypeName
return &Cassandra{
cassandraConnectionProducer: connProducer,
}
}
// Type returns the TypeName for this backend
func (c *Cassandra) Type() (string, error) {
return cassandraTypeName, nil
}
func (c *Cassandra) getConnection(ctx context.Context) (*gocql.Session, error) {
session, err := c.Connection(ctx)
if err != nil {
return nil, err
}
return session.(*gocql.Session), nil
}
func (c *Cassandra) Initialize(ctx context.Context, req dbplugin.InitializeRequest) (dbplugin.InitializeResponse, error) {
usernameTemplate, err := strutil.GetString(req.Config, "username_template")
if err != nil {
return dbplugin.InitializeResponse{}, fmt.Errorf("failed to retrieve username_template: %w", err)
}
if usernameTemplate == "" {
usernameTemplate = defaultUserNameTemplate
}
up, err := template.NewTemplate(template.Template(usernameTemplate))
if err != nil {
return dbplugin.InitializeResponse{}, fmt.Errorf("unable to initialize username template: %w", err)
}
c.usernameProducer = up
_, err = c.usernameProducer.Generate(dbplugin.UsernameMetadata{})
if err != nil {
return dbplugin.InitializeResponse{}, fmt.Errorf("invalid username template: %w", err)
}
err = c.cassandraConnectionProducer.Initialize(ctx, req)
if err != nil {
return dbplugin.InitializeResponse{}, fmt.Errorf("failed to initialize: %w", err)
}
resp := dbplugin.InitializeResponse{
Config: req.Config,
}
return resp, nil
}
// NewUser generates the username/password on the underlying Cassandra secret backend as instructed by
// the statements provided.
func (c *Cassandra) NewUser(ctx context.Context, req dbplugin.NewUserRequest) (dbplugin.NewUserResponse, error) {
c.Lock()
defer c.Unlock()
session, err := c.getConnection(ctx)
if err != nil {
return dbplugin.NewUserResponse{}, err
}
creationCQL := req.Statements.Commands
if len(creationCQL) == 0 {
creationCQL = []string{defaultUserCreationCQL}
}
rollbackCQL := req.RollbackStatements.Commands
if len(rollbackCQL) == 0 {
rollbackCQL = []string{defaultUserDeletionCQL}
}
username, err := c.usernameProducer.Generate(req.UsernameConfig)
if err != nil {
return dbplugin.NewUserResponse{}, err
}
for _, stmt := range creationCQL {
for _, query := range strutil.ParseArbitraryStringSlice(stmt, ";") {
query = strings.TrimSpace(query)
if len(query) == 0 {
continue
}
m := map[string]string{
"username": username,
"password": req.Password,
}
err = session.
Query(dbutil.QueryHelper(query, m)).
WithContext(ctx).
Exec()
if err != nil {
rollbackErr := rollbackUser(ctx, session, username, rollbackCQL)
if rollbackErr != nil {
err = multierror.Append(err, rollbackErr)
}
return dbplugin.NewUserResponse{}, err
}
}
}
resp := dbplugin.NewUserResponse{
Username: username,
}
return resp, nil
}
func rollbackUser(ctx context.Context, session *gocql.Session, username string, rollbackCQL []string) error {
for _, stmt := range rollbackCQL {
for _, query := range strutil.ParseArbitraryStringSlice(stmt, ";") {
query = strings.TrimSpace(query)
if len(query) == 0 {
continue
}
m := map[string]string{
"username": username,
}
err := session.
Query(dbutil.QueryHelper(query, m)).
WithContext(ctx).
Exec()
if err != nil {
return fmt.Errorf("failed to roll back user %s: %w", username, err)
}
}
}
return nil
}
func (c *Cassandra) UpdateUser(ctx context.Context, req dbplugin.UpdateUserRequest) (dbplugin.UpdateUserResponse, error) {
if req.Password == nil && req.Expiration == nil {
return dbplugin.UpdateUserResponse{}, fmt.Errorf("no changes requested")
}
if req.Password != nil {
err := c.changeUserPassword(ctx, req.Username, req.Password)
return dbplugin.UpdateUserResponse{}, err
}
// Expiration is no-op
return dbplugin.UpdateUserResponse{}, nil
}
func (c *Cassandra) changeUserPassword(ctx context.Context, username string, changePass *dbplugin.ChangePassword) error {
session, err := c.getConnection(ctx)
if err != nil {
return err
}
rotateCQL := changePass.Statements.Commands
if len(rotateCQL) == 0 {
rotateCQL = []string{defaultChangePasswordCQL}
}
var result *multierror.Error
for _, stmt := range rotateCQL {
for _, query := range strutil.ParseArbitraryStringSlice(stmt, ";") {
query = strings.TrimSpace(query)
if len(query) == 0 {
continue
}
m := map[string]string{
"username": username,
"password": changePass.NewPassword,
}
err := session.
Query(dbutil.QueryHelper(query, m)).
WithContext(ctx).
Exec()
result = multierror.Append(result, err)
}
}
return result.ErrorOrNil()
}
// DeleteUser attempts to drop the specified user.
func (c *Cassandra) DeleteUser(ctx context.Context, req dbplugin.DeleteUserRequest) (dbplugin.DeleteUserResponse, error) {
c.Lock()
defer c.Unlock()
session, err := c.getConnection(ctx)
if err != nil {
return dbplugin.DeleteUserResponse{}, err
}
revocationCQL := req.Statements.Commands
if len(revocationCQL) == 0 {
revocationCQL = []string{defaultUserDeletionCQL}
}
var result *multierror.Error
for _, stmt := range revocationCQL {
for _, query := range strutil.ParseArbitraryStringSlice(stmt, ";") {
query = strings.TrimSpace(query)
if len(query) == 0 {
continue
}
m := map[string]string{
"username": req.Username,
}
err := session.
Query(dbutil.QueryHelper(query, m)).
WithContext(ctx).
Exec()
result = multierror.Append(result, err)
}
}
return dbplugin.DeleteUserResponse{}, result.ErrorOrNil()
}