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