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mongodb.go
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mongodb.go
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package mongodb
import (
"context"
"errors"
"io"
"strings"
"time"
"encoding/json"
"fmt"
"github.com/hashicorp/errwrap"
"github.com/hashicorp/vault/api"
"github.com/hashicorp/vault/builtin/logical/database/dbplugin"
"github.com/hashicorp/vault/plugins"
"github.com/hashicorp/vault/plugins/helper/database/credsutil"
"github.com/hashicorp/vault/plugins/helper/database/dbutil"
mgo "gopkg.in/mgo.v2"
)
const mongoDBTypeName = "mongodb"
// MongoDB is an implementation of Database interface
type MongoDB struct {
*mongoDBConnectionProducer
credsutil.CredentialsProducer
}
var _ dbplugin.Database = &MongoDB{}
// New returns a new MongoDB instance
func New() (interface{}, error) {
db := new()
dbType := dbplugin.NewDatabaseErrorSanitizerMiddleware(db, db.secretValues)
return dbType, nil
}
func new() *MongoDB {
connProducer := &mongoDBConnectionProducer{}
connProducer.Type = mongoDBTypeName
credsProducer := &credsutil.SQLCredentialsProducer{
DisplayNameLen: 15,
RoleNameLen: 15,
UsernameLen: 100,
Separator: "-",
}
return &MongoDB{
mongoDBConnectionProducer: connProducer,
CredentialsProducer: credsProducer,
}
}
// Run instantiates a MongoDB object, and runs the RPC server for the plugin
func Run(apiTLSConfig *api.TLSConfig) error {
dbType, err := New()
if err != nil {
return err
}
plugins.Serve(dbType.(*MongoDB), apiTLSConfig)
return nil
}
// Type returns the TypeName for this backend
func (m *MongoDB) Type() (string, error) {
return mongoDBTypeName, nil
}
func (m *MongoDB) getConnection(ctx context.Context) (*mgo.Session, error) {
session, err := m.Connection(ctx)
if err != nil {
return nil, err
}
return session.(*mgo.Session), nil
}
// CreateUser generates the username/password on the underlying secret backend as instructed by
// the CreationStatement provided. The creation statement is a JSON blob that has a db value,
// and an array of roles that accepts a role, and an optional db value pair. This array will
// be normalized the format specified in the mongoDB docs:
// https://docs.mongodb.com/manual/reference/command/createUser/#dbcmd.createUser
//
// JSON Example:
// { "db": "admin", "roles": [{ "role": "readWrite" }, {"role": "read", "db": "foo"}] }
func (m *MongoDB) CreateUser(ctx context.Context, statements dbplugin.Statements, usernameConfig dbplugin.UsernameConfig, expiration time.Time) (username string, password string, err error) {
// Grab the lock
m.Lock()
defer m.Unlock()
statements = dbutil.StatementCompatibilityHelper(statements)
if len(statements.Creation) == 0 {
return "", "", dbutil.ErrEmptyCreationStatement
}
session, err := m.getConnection(ctx)
if err != nil {
return "", "", err
}
username, err = m.GenerateUsername(usernameConfig)
if err != nil {
return "", "", err
}
password, err = m.GeneratePassword()
if err != nil {
return "", "", err
}
// Unmarshal statements.CreationStatements into mongodbRoles
var mongoCS mongoDBStatement
err = json.Unmarshal([]byte(statements.Creation[0]), &mongoCS)
if err != nil {
return "", "", err
}
// Default to "admin" if no db provided
if mongoCS.DB == "" {
mongoCS.DB = "admin"
}
if len(mongoCS.Roles) == 0 {
return "", "", fmt.Errorf("roles array is required in creation statement")
}
createUserCmd := createUserCommand{
Username: username,
Password: password,
Roles: mongoCS.Roles.toStandardRolesArray(),
}
err = session.DB(mongoCS.DB).Run(createUserCmd, nil)
switch {
case err == nil:
case err == io.EOF, strings.Contains(err.Error(), "EOF"):
// Call getConnection to reset and retry query if we get an EOF error on first attempt.
session, err := m.getConnection(ctx)
if err != nil {
return "", "", err
}
err = session.DB(mongoCS.DB).Run(createUserCmd, nil)
if err != nil {
return "", "", err
}
default:
return "", "", err
}
return username, password, nil
}
// RenewUser is not supported on MongoDB, so this is a no-op.
func (m *MongoDB) RenewUser(ctx context.Context, statements dbplugin.Statements, username string, expiration time.Time) error {
// NOOP
return nil
}
// RevokeUser drops the specified user from the authentication database. If none is provided
// in the revocation statement, the default "admin" authentication database will be assumed.
func (m *MongoDB) RevokeUser(ctx context.Context, statements dbplugin.Statements, username string) error {
m.Lock()
defer m.Unlock()
statements = dbutil.StatementCompatibilityHelper(statements)
session, err := m.getConnection(ctx)
if err != nil {
return err
}
// If no revocation statements provided, pass in empty JSON
var revocationStatement string
switch len(statements.Revocation) {
case 0:
revocationStatement = `{}`
case 1:
revocationStatement = statements.Revocation[0]
default:
return fmt.Errorf("expected 0 or 1 revocation statements, got %d", len(statements.Revocation))
}
// Unmarshal revocation statements into mongodbRoles
var mongoCS mongoDBStatement
err = json.Unmarshal([]byte(revocationStatement), &mongoCS)
if err != nil {
return err
}
db := mongoCS.DB
// If db is not specified, use the default authenticationDatabase "admin"
if db == "" {
db = "admin"
}
err = session.DB(db).RemoveUser(username)
switch {
case err == nil, err == mgo.ErrNotFound:
case err == io.EOF, strings.Contains(err.Error(), "EOF"):
if err := m.Close(); err != nil {
return errwrap.Wrapf("error closing EOF'd mongo connection: {{err}}", err)
}
session, err := m.getConnection(ctx)
if err != nil {
return err
}
err = session.DB(db).RemoveUser(username)
if err != nil {
return err
}
default:
return err
}
return nil
}
// RotateRootCredentials is not currently supported on MongoDB
func (m *MongoDB) RotateRootCredentials(ctx context.Context, statements []string) (map[string]interface{}, error) {
return nil, errors.New("root credential rotation is not currently implemented in this database secrets engine")
}