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|
package proxy
import (
"database/sql"
"errors"
"net"
"os"
"path/filepath"
"time"
_ "github.com/mattn/go-sqlite3"
)
type authSQLite3 struct {
db *sql.DB
}
// Exists reports whether a user is registered.
func (a authSQLite3) Exists(name string) bool {
if err := a.init(); err != nil {
return false
}
defer a.close()
var name2 string
err := a.db.QueryRow(`SELECT name FROM user WHERE name = ?;`, name).Scan(&name2)
return err == nil
}
// Passwd returns the SRP salt and verifier of a user or an error.
func (a authSQLite3) Passwd(name string) (salt, verifier []byte, err error) {
if err = a.init(); err != nil {
return
}
defer a.close()
a.db.QueryRow(`SELECT salt, verifier FROM user WHERE name = ?;`, name).Scan(&salt, &verifier)
a.updateTimestamp(name)
return
}
// SetPasswd creates a password entry if necessary
// and sets the password of a user.
func (a authSQLite3) SetPasswd(name string, salt, verifier []byte) error {
if err := a.init(); err != nil {
return err
}
defer a.close()
_, err := a.db.Exec(`REPLACE INTO user (name, salt, verifier) VALUES (?, ?, ?);`, name, salt, verifier)
if err != nil {
return err
}
a.updateTimestamp(name)
return nil
}
// Timestamp returns the last time an authentication entry was accessed
// or an error.
func (a authSQLite3) Timestamp(name string) (time.Time, error) {
if err := a.init(); err != nil {
return time.Time{}, err
}
defer a.close()
var tstr string
err := a.db.QueryRow(`SELECT timestamp FROM user WHERE name = ?;`, name).Scan(&tstr)
if err != nil {
return time.Time{}, err
}
return time.Parse("2006-01-02 15:04:05", tstr)
}
// Import deletes all users and and adds the passed
// users.
func (a authSQLite3) Import(in []user) {
if err := a.init(); err != nil {
return
}
defer a.close()
a.db.Exec(`DELETE FROM user;`)
for _, u := range in {
a.SetPasswd(u.name, u.salt, u.verifier)
a.db.Query(`UPDATE user SET timestamp = ? WHERE name = ?;`, u.timestamp.Format("2006-01-02 15:04:05"), u.name)
}
}
// Export returns data that can be processed by Import
// or an error.
func (a authSQLite3) Export() ([]user, error) {
if err := a.init(); err != nil {
return nil, err
}
defer a.close()
rows, err := a.db.Query(`SELECT * FROM user;`)
if err != nil {
return nil, err
}
defer rows.Close()
var names []string
for rows.Next() {
var name string
if err := rows.Scan(&name); err != nil {
return nil, err
}
names = append(names, name)
}
var out []user
for _, name := range names {
var u user
u.timestamp, err = a.Timestamp(name)
if err != nil {
return nil, err
}
u.salt, u.verifier, err = a.Passwd(name)
if err != nil {
return nil, err
}
out = append(out, u)
}
return out, nil
}
// Ban adds a ban entry for a network address and an associated name.
func (a authSQLite3) Ban(addr, name string) error {
if err := a.init(); err != nil {
return err
}
defer a.close()
if _, err := a.db.Exec(`INSERT INTO ban (addr, name) VALUES (?, ?);`, addr, name); err != nil {
return err
}
return nil
}
// Unban deletes a ban entry. It accepts both network addresses
// and player names.
func (a authSQLite3) Unban(id string) error {
if err := a.init(); err != nil {
return err
}
defer a.close()
if _, err := a.db.Exec(`DELETE FROM ban WHERE addr = ? OR name = ?;`, id, id); err != nil {
return err
}
return nil
}
// Banned reports whether a network address is banned
func (a authSQLite3) Banned(addr *net.UDPAddr) bool {
if err := a.init(); err != nil {
return true
}
defer a.close()
var name string
if err := a.db.QueryRow(`SELECT name FROM ban WHERE addr = ?;`, addr.String()).Scan(&name); err != nil {
if errors.Is(err, sql.ErrNoRows) {
return false
}
return true
}
return true
}
// ImportBans deletes all ban entries and adds the passed entries.
func (a authSQLite3) ImportBans(in []ban) {
if err := a.init(); err != nil {
return
}
defer a.close()
a.db.Exec(`DELETE FROM ban;`)
for _, b := range in {
a.Ban(b.addr, b.name)
}
}
// ExportBans returns data that can be processed by ImportBans
// or an error.
func (a authSQLite3) ExportBans() ([]ban, error) {
if err := a.init(); err != nil {
return nil, err
}
defer a.close()
rows, err := a.db.Query(`SELECT * FROM ban;`)
if err != nil {
return nil, err
}
defer rows.Close()
var out []ban
for rows.Next() {
var b ban
if err := rows.Scan(&b.addr, &b.name); err != nil {
return nil, err
}
out = append(out, b)
}
return out, nil
}
func (a authSQLite3) updateTimestamp(name string) {
a.db.Exec(`UPDATE user SET timestamp = datetime("now") WHERE name = ?;`, name)
}
func (a *authSQLite3) init() error {
executable, err := os.Executable()
if err != nil {
return err
}
path := filepath.Dir(executable) + "/auth.sqlite"
a.db, err = sql.Open("sqlite3", path)
if err != nil {
return err
}
init := `CREATE TABLE IF NOT EXISTS user (
name VARCHAR(20) PRIMARY KEY NOT NULL,
salt BLOB NOT NULL,
verifier BLOB NOT NULL,
timestamp DATETIME DEFAULT CURRENT_TIMESTAMP);
CREATE TABLE IF NOT EXISTS ban (
addr VARCHAR(39) PRIMARY KEY NOT NULL,
name VARCHAR(20));`
if _, err := a.db.Exec(init); err != nil {
return err
}
return nil
}
func (a authSQLite3) close() error {
return a.db.Close()
}
|
