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|
package proxy
import (
"database/sql"
"errors"
"net"
"time"
)
// A handle to a SQLite3 authentication database.
// The upstream Minetest schema is used.
//
// Table info:
//
// 0|id|INTEGER|0||1
// 1|name|VARCHAR(32)|0||0
// 2|password|VARCHAR(512)|0||0
// 3|last_login|INTEGER|0||0
type AuthMTSQLite3 struct {
db *sql.DB
}
// NewAuthMTSQLite3 opens the SQLite3 authentication database at auth.sqlite.
func NewAuthMTSQLite3() (*AuthMTSQLite3, error) {
db, err := sql.Open("sqlite3", "auth.sqlite")
if err != nil {
return nil, err
}
// Initialize the database if necessary.
if _, err := db.Exec("CREATE TABLE IF NOT EXISTS auth (id INTEGER PRIMARY KEY AUTOINCREMENT, name VARCHAR(32) UNIQUE, password VARCHAR(512), last_login INTEGER);"); err != nil {
return nil, err
}
return &AuthMTSQLite3{db}, nil
}
// Close closes the underlying SQLite3 database handle.
func (a *AuthMTSQLite3) Close() error {
return a.db.Close()
}
// Exists reports whether a user is registered.
// Error cases count as inexistent.
func (a *AuthMTSQLite3) Exists(name string) bool {
result := a.db.QueryRow("SELECT COUNT(1) FROM auth WHERE name = ?;", name)
var count int
if err := result.Scan(&count); err != nil {
return false
}
return count == 1
}
// Passwd returns the SRP salt and verifier of a user or an error.
func (a *AuthMTSQLite3) Passwd(name string) (salt, verifier []byte, err error) {
result := a.db.QueryRow("SELECT password FROM auth WHERE name = ?;", name)
var encodedPasswd string
if err = result.Scan(&encodedPasswd); err != nil {
return
}
salt, verifier, err = decodeVerifierAndSalt(encodedPasswd)
a.updateTimestamp(name)
return
}
// SetPasswd creates a password entry if necessary
// and sets the password of a user.
func (a *AuthMTSQLite3) SetPasswd(name string, salt, verifier []byte) error {
encodedPasswd := encodeVerifierAndSalt(salt, verifier)
_, err := a.db.Exec("REPLACE INTO auth (name, password, last_login) VALUES (?, ?, unixepoch());", name, encodedPasswd)
return err
}
// LastSrv always returns an error
// since the Minetest database schema cannot store this information.
func (a *AuthMTSQLite3) LastSrv(_ string) (string, error) {
return "", ErrLastSrvNotSupported
}
// SetLastSrv is a no-op
// since the Minetest database schema cannot store this information.
func (a *AuthMTSQLite3) SetLastSrv(_, _ string) error {
return nil
}
// Timestamp returns the last time an authentication entry was accessed
// or an error.
func (a *AuthMTSQLite3) Timestamp(name string) (time.Time, error) {
result := a.db.QueryRow("SELECT last_login FROM auth WHERE name = ?;", name)
var timestamp int64
if err := result.Scan(×tamp); err != nil {
return time.Time{}, err
}
return time.Unix(timestamp, 0), nil
}
// Import adds the passed users.
func (a *AuthMTSQLite3) Import(in []user) error {
for _, u := range in {
if err := a.SetPasswd(u.name, u.salt, u.verifier); err != nil {
return err
}
a.setTimestamp(u.name, u.timestamp)
}
return nil
}
// Export returns data that can be processed by Import
// or an error.
func (a *AuthMTSQLite3) Export() ([]user, error) {
var names []string
result := a.db.QueryRow("SELECT name FROM auth;")
for {
var name string
if err := result.Scan(&name); err != nil {
if errors.Is(err, sql.ErrNoRows) {
break
}
return nil, err
}
names = append(names, name)
}
var out []user
for _, name := range names {
u := user{name: name}
var err error
u.timestamp, err = a.Timestamp(u.name)
if err != nil {
return nil, err
}
u.salt, u.verifier, err = a.Passwd(u.name)
if err != nil {
return nil, err
}
out = append(out, u)
}
return out, nil
}
// Ban always returns an error
// since the Minetest database schema cannot store this information.
func (a *AuthMTSQLite3) Ban(_, _ string) error {
return ErrBanNotSupported
}
// Unban always returns an error
// since the Minetest database schema cannot store this information.
func (a *AuthMTSQLite3) Unban(_ string) error {
return ErrBanNotSupported
}
// Banned always reports that the user is not banned
// since the Minetest database schema cannot store this information.
func (a *AuthMTSQLite3) Banned(_ *net.UDPAddr) bool {
return false
}
// ImportBans always returns an error
// since the Minetest database schema cannot store this information.
func (a *AuthMTSQLite3) ImportBans(in []ban) error {
return ErrBanNotSupported
}
// ExportBans always returns an empty list of ban entries
// since the Minetest database schema cannot store this information.
func (a *AuthMTSQLite3) ExportBans() ([]ban, error) {
return []ban{}, nil
}
func (a *AuthMTSQLite3) setTimestamp(name string, t time.Time) {
timestamp := t.Unix()
a.db.Exec("UPDATE auth SET last_login = ? WHERE name = ?;", timestamp, name)
}
func (a *AuthMTSQLite3) updateTimestamp(name string) {
a.setTimestamp(name, time.Now().Local())
}
|
