296 lines
7.2 KiB
Go
296 lines
7.2 KiB
Go
package hana
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import (
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"context"
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"database/sql"
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"errors"
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"fmt"
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"strings"
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"time"
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_ "github.com/SAP/go-hdb/driver"
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"github.com/hashicorp/vault/api"
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"github.com/hashicorp/vault/sdk/database/dbplugin"
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"github.com/hashicorp/vault/sdk/database/helper/connutil"
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"github.com/hashicorp/vault/sdk/database/helper/credsutil"
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"github.com/hashicorp/vault/sdk/database/helper/dbutil"
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"github.com/hashicorp/vault/sdk/helper/dbtxn"
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"github.com/hashicorp/vault/sdk/helper/strutil"
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)
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const (
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hanaTypeName = "hdb"
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)
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// HANA is an implementation of Database interface
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type HANA struct {
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*connutil.SQLConnectionProducer
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credsutil.CredentialsProducer
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}
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var _ dbplugin.Database = &HANA{}
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// New implements builtinplugins.BuiltinFactory
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func New() (interface{}, error) {
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db := new()
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// Wrap the plugin with middleware to sanitize errors
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dbType := dbplugin.NewDatabaseErrorSanitizerMiddleware(db, db.SecretValues)
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return dbType, nil
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}
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func new() *HANA {
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connProducer := &connutil.SQLConnectionProducer{}
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connProducer.Type = hanaTypeName
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credsProducer := &credsutil.SQLCredentialsProducer{
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DisplayNameLen: 32,
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RoleNameLen: 20,
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UsernameLen: 128,
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Separator: "_",
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}
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return &HANA{
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SQLConnectionProducer: connProducer,
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CredentialsProducer: credsProducer,
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}
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}
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// Run instantiates a HANA object, and runs the RPC server for the plugin
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func Run(apiTLSConfig *api.TLSConfig) error {
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dbType, err := New()
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if err != nil {
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return err
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}
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dbplugin.Serve(dbType.(dbplugin.Database), api.VaultPluginTLSProvider(apiTLSConfig))
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return nil
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}
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// Type returns the TypeName for this backend
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func (h *HANA) Type() (string, error) {
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return hanaTypeName, nil
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}
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func (h *HANA) getConnection(ctx context.Context) (*sql.DB, error) {
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db, err := h.Connection(ctx)
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if err != nil {
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return nil, err
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}
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return db.(*sql.DB), nil
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}
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// CreateUser generates the username/password on the underlying HANA secret backend
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// as instructed by the CreationStatement provided.
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func (h *HANA) CreateUser(ctx context.Context, statements dbplugin.Statements, usernameConfig dbplugin.UsernameConfig, expiration time.Time) (username string, password string, err error) {
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// Grab the lock
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h.Lock()
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defer h.Unlock()
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statements = dbutil.StatementCompatibilityHelper(statements)
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// Get the connection
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db, err := h.getConnection(ctx)
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if err != nil {
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return "", "", err
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}
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if len(statements.Creation) == 0 {
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return "", "", dbutil.ErrEmptyCreationStatement
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}
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// Generate username
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username, err = h.GenerateUsername(usernameConfig)
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if err != nil {
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return "", "", err
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}
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// HANA does not allow hyphens in usernames, and highly prefers capital letters
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username = strings.Replace(username, "-", "_", -1)
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username = strings.ToUpper(username)
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// Generate password
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password, err = h.GeneratePassword()
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if err != nil {
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return "", "", err
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}
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// Most HANA configurations have password constraints
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// Prefix with A1a to satisfy these constraints. User will be forced to change upon login
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password = strings.Replace(password, "-", "_", -1)
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password = "A1a" + password
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// If expiration is in the role SQL, HANA will deactivate the user when time is up,
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// regardless of whether vault is alive to revoke lease
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expirationStr, err := h.GenerateExpiration(expiration)
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if err != nil {
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return "", "", err
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}
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// Start a transaction
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tx, err := db.BeginTx(ctx, nil)
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if err != nil {
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return "", "", err
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}
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defer tx.Rollback()
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// Execute each query
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for _, stmt := range statements.Creation {
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for _, query := range strutil.ParseArbitraryStringSlice(stmt, ";") {
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query = strings.TrimSpace(query)
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if len(query) == 0 {
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continue
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}
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m := map[string]string{
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"name": username,
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"password": password,
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"expiration": expirationStr,
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}
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if err := dbtxn.ExecuteTxQuery(ctx, tx, m, query); err != nil {
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return "", "", err
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}
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}
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}
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// Commit the transaction
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if err := tx.Commit(); err != nil {
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return "", "", err
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}
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return username, password, nil
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}
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// Renewing hana user just means altering user's valid until property
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func (h *HANA) RenewUser(ctx context.Context, statements dbplugin.Statements, username string, expiration time.Time) error {
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statements = dbutil.StatementCompatibilityHelper(statements)
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// Get connection
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db, err := h.getConnection(ctx)
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if err != nil {
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return err
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}
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// Start a transaction
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tx, err := db.BeginTx(ctx, nil)
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if err != nil {
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return err
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}
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defer tx.Rollback()
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// If expiration is in the role SQL, HANA will deactivate the user when time is up,
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// regardless of whether vault is alive to revoke lease
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expirationStr, err := h.GenerateExpiration(expiration)
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if err != nil {
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return err
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}
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// Renew user's valid until property field
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stmt, err := tx.PrepareContext(ctx, "ALTER USER "+username+" VALID UNTIL "+"'"+expirationStr+"'")
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if err != nil {
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return err
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}
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defer stmt.Close()
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if _, err := stmt.ExecContext(ctx); err != nil {
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return err
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}
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// Commit the transaction
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if err := tx.Commit(); err != nil {
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return err
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}
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return nil
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}
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// Revoking hana user will deactivate user and try to perform a soft drop
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func (h *HANA) RevokeUser(ctx context.Context, statements dbplugin.Statements, username string) error {
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statements = dbutil.StatementCompatibilityHelper(statements)
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// default revoke will be a soft drop on user
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if len(statements.Revocation) == 0 {
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return h.revokeUserDefault(ctx, username)
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}
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// Get connection
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db, err := h.getConnection(ctx)
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if err != nil {
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return err
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}
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// Start a transaction
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tx, err := db.BeginTx(ctx, nil)
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if err != nil {
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return err
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}
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defer tx.Rollback()
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// Execute each query
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for _, stmt := range statements.Revocation {
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for _, query := range strutil.ParseArbitraryStringSlice(stmt, ";") {
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query = strings.TrimSpace(query)
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if len(query) == 0 {
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continue
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}
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m := map[string]string{
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"name": username,
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}
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if err := dbtxn.ExecuteTxQuery(ctx, tx, m, query); err != nil {
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return err
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}
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}
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}
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return tx.Commit()
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}
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func (h *HANA) revokeUserDefault(ctx context.Context, username string) error {
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// Get connection
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db, err := h.getConnection(ctx)
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if err != nil {
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return err
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}
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// Start a transaction
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tx, err := db.BeginTx(ctx, nil)
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if err != nil {
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return err
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}
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defer tx.Rollback()
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// Disable server login for user
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disableStmt, err := tx.PrepareContext(ctx, fmt.Sprintf("ALTER USER %s DEACTIVATE USER NOW", username))
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if err != nil {
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return err
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}
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defer disableStmt.Close()
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if _, err := disableStmt.ExecContext(ctx); err != nil {
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return err
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}
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// Invalidates current sessions and performs soft drop (drop if no dependencies)
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// if hard drop is desired, custom revoke statements should be written for role
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dropStmt, err := tx.PrepareContext(ctx, fmt.Sprintf("DROP USER %s RESTRICT", username))
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if err != nil {
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return err
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}
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defer dropStmt.Close()
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if _, err := dropStmt.ExecContext(ctx); err != nil {
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return err
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}
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// Commit transaction
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if err := tx.Commit(); err != nil {
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return err
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}
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return nil
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}
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// RotateRootCredentials is not currently supported on HANA
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func (h *HANA) RotateRootCredentials(ctx context.Context, statements []string) (map[string]interface{}, error) {
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return nil, errors.New("root credentaion rotation is not currently implemented in this database secrets engine")
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}
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