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backend.go
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backend.go
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package mssql
import (
"context"
"database/sql"
"fmt"
"strings"
"sync"
_ "github.com/denisenkom/go-mssqldb"
"github.com/hashicorp/vault/sdk/framework"
"github.com/hashicorp/vault/sdk/logical"
)
func Factory(ctx context.Context, conf *logical.BackendConfig) (logical.Backend, error) {
b := Backend()
if err := b.Setup(ctx, conf); err != nil {
return nil, err
}
return b, nil
}
func Backend() *backend {
var b backend
b.Backend = &framework.Backend{
Help: strings.TrimSpace(backendHelp),
PathsSpecial: &logical.Paths{
SealWrapStorage: []string{
"config/connection",
},
},
Paths: []*framework.Path{
pathConfigConnection(&b),
pathConfigLease(&b),
pathListRoles(&b),
pathRoles(&b),
pathCredsCreate(&b),
},
Secrets: []*framework.Secret{
secretCreds(&b),
},
Invalidate: b.invalidate,
Clean: b.ResetDB,
BackendType: logical.TypeLogical,
}
return &b
}
type backend struct {
*framework.Backend
db *sql.DB
defaultDb string
lock sync.Mutex
}
// DB returns the default database connection.
func (b *backend) DB(ctx context.Context, s logical.Storage) (*sql.DB, error) {
b.lock.Lock()
defer b.lock.Unlock()
// If we already have a DB, we got it!
if b.db != nil {
if err := b.db.Ping(); err == nil {
return b.db, nil
}
// If the ping was unsuccessful, close it and ignore errors as we'll be
// reestablishing anyways
b.db.Close()
}
// Otherwise, attempt to make connection
entry, err := s.Get(ctx, "config/connection")
if err != nil {
return nil, err
}
if entry == nil {
return nil, fmt.Errorf("configure the DB connection with config/connection first")
}
var connConfig connectionConfig
if err := entry.DecodeJSON(&connConfig); err != nil {
return nil, err
}
connString := connConfig.ConnectionString
db, err := sql.Open("sqlserver", connString)
if err != nil {
return nil, err
}
// Set some connection pool settings. We don't need much of this,
// since the request rate shouldn't be high.
db.SetMaxOpenConns(connConfig.MaxOpenConnections)
stmt, err := db.Prepare("SELECT db_name();")
if err != nil {
return nil, err
}
defer stmt.Close()
err = stmt.QueryRow().Scan(&b.defaultDb)
if err != nil {
return nil, err
}
b.db = db
return b.db, nil
}
// ResetDB forces a connection next time DB() is called.
func (b *backend) ResetDB(_ context.Context) {
b.lock.Lock()
defer b.lock.Unlock()
if b.db != nil {
b.db.Close()
}
b.db = nil
}
func (b *backend) invalidate(ctx context.Context, key string) {
switch key {
case "config/connection":
b.ResetDB(ctx)
}
}
// LeaseConfig returns the lease configuration
func (b *backend) LeaseConfig(ctx context.Context, s logical.Storage) (*configLease, error) {
entry, err := s.Get(ctx, "config/lease")
if err != nil {
return nil, err
}
if entry == nil {
return nil, nil
}
var result configLease
if err := entry.DecodeJSON(&result); err != nil {
return nil, err
}
return &result, nil
}
const backendHelp = `
The MSSQL backend dynamically generates database users.
After mounting this backend, configure it using the endpoints within
the "config/" path.
This backend does not support Azure SQL Databases.
`