320 lines
7.4 KiB
Go
320 lines
7.4 KiB
Go
package auth
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import (
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"context"
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"crypto/aes"
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"crypto/cipher"
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"crypto/md5"
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"crypto/rand"
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"crypto/sha256"
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"database/sql"
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"encoding/base64"
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"encoding/hex"
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"errors"
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"fmt"
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"io"
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"strings"
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"time"
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"golang.org/x/crypto/bcrypt"
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)
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var (
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ErrInvalidCredentials = errors.New("invalid credentials")
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ErrUnauthorized = errors.New("unauthorized")
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)
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type User struct {
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ID string `json:"id"`
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Username string `json:"username"`
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IsAdmin bool `json:"isAdmin"`
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CreatedAt time.Time `json:"createdAt"`
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LastLoginAt time.Time `json:"lastLoginAt"`
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}
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type Session struct {
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Token string `json:"token"`
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User User `json:"user"`
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}
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type Service struct {
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db *sql.DB
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encryptionKey string
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}
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func NewService(db *sql.DB, encryptionKey string) *Service {
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return &Service{db: db, encryptionKey: encryptionKey}
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}
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func (s *Service) Login(ctx context.Context, username, password string) (Session, error) {
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user, passwordHash, _, err := s.findUserByUsername(ctx, username)
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if err != nil {
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if errors.Is(err, sql.ErrNoRows) {
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return Session{}, ErrInvalidCredentials
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}
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return Session{}, fmt.Errorf("find user: %w", err)
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}
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if err := bcrypt.CompareHashAndPassword([]byte(passwordHash), []byte(password)); err != nil {
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return Session{}, ErrInvalidCredentials
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}
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if err := s.storeSubsonicSecret(ctx, user.ID, password); err != nil {
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return Session{}, fmt.Errorf("store subsonic secret: %w", err)
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}
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token, err := newToken()
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if err != nil {
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return Session{}, fmt.Errorf("generate token: %w", err)
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}
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now := time.Now().UTC()
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expiresAt := now.Add(30 * 24 * time.Hour)
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if _, err := s.db.ExecContext(
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ctx,
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`INSERT INTO sessions (token, user_id, created_at, expires_at) VALUES (?, ?, ?, ?)`,
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token,
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user.ID,
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now.Format(time.RFC3339),
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expiresAt.Format(time.RFC3339),
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); err != nil {
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return Session{}, fmt.Errorf("insert session: %w", err)
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}
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if _, err := s.db.ExecContext(
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ctx,
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`UPDATE users SET last_login_at = ? WHERE id = ?`,
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now.Format(time.RFC3339),
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user.ID,
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); err == nil {
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user.LastLoginAt = now
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}
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return Session{
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Token: token,
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User: user,
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}, nil
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}
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func (s *Service) CurrentUser(ctx context.Context, authorizationHeader string) (User, error) {
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token := strings.TrimSpace(strings.TrimPrefix(authorizationHeader, "Bearer "))
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return s.CurrentUserByToken(ctx, token)
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}
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func (s *Service) CurrentUserByToken(ctx context.Context, token string) (User, error) {
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if token == "" {
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return User{}, ErrUnauthorized
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}
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user, err := s.findUserByToken(ctx, token)
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if err != nil {
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if errors.Is(err, sql.ErrNoRows) {
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return User{}, ErrUnauthorized
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}
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return User{}, fmt.Errorf("find user by token: %w", err)
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}
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return user, nil
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}
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func (s *Service) CurrentUserBySubsonicAuth(ctx context.Context, username, password, token, salt string) (User, error) {
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if username == "" {
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return User{}, ErrUnauthorized
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}
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user, passwordHash, encryptedSecret, err := s.findUserByUsername(ctx, username)
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if err != nil {
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if errors.Is(err, sql.ErrNoRows) {
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return User{}, ErrUnauthorized
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}
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return User{}, fmt.Errorf("find user by username: %w", err)
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}
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if token != "" || salt != "" {
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if token == "" || salt == "" || encryptedSecret == "" {
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return User{}, ErrUnauthorized
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}
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secret, err := decryptSecret(encryptedSecret, s.encryptionKey)
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if err != nil {
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return User{}, ErrUnauthorized
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}
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if hexMD5(secret+salt) != strings.ToLower(token) {
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return User{}, ErrUnauthorized
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}
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return user, nil
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}
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if strings.HasPrefix(password, "enc:") {
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decoded, err := hex.DecodeString(strings.TrimPrefix(password, "enc:"))
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if err != nil {
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return User{}, ErrUnauthorized
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}
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password = string(decoded)
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}
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if err := bcrypt.CompareHashAndPassword([]byte(passwordHash), []byte(password)); err != nil {
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return User{}, ErrUnauthorized
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}
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if err := s.storeSubsonicSecret(ctx, user.ID, password); err != nil {
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return User{}, fmt.Errorf("store subsonic secret: %w", err)
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}
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return user, nil
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}
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func (s *Service) findUserByUsername(ctx context.Context, username string) (User, string, string, error) {
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var user User
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var passwordHash string
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var subsonicSecret sql.NullString
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var createdAt string
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var lastLoginAt sql.NullString
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var isAdmin int
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err := s.db.QueryRowContext(
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ctx,
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`SELECT id, username, password_hash, COALESCE(subsonic_auth_secret, ''), is_admin, created_at, last_login_at
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FROM users
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WHERE username = ?`,
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username,
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).Scan(
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&user.ID,
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&user.Username,
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&passwordHash,
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&subsonicSecret,
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&isAdmin,
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&createdAt,
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&lastLoginAt,
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)
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if err != nil {
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return User{}, "", "", err
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}
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user.IsAdmin = isAdmin == 1
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user.CreatedAt = parseTime(createdAt)
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if lastLoginAt.Valid {
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user.LastLoginAt = parseTime(lastLoginAt.String)
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}
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return user, passwordHash, subsonicSecret.String, nil
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}
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func (s *Service) findUserByToken(ctx context.Context, token string) (User, error) {
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var user User
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var createdAt string
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var lastLoginAt sql.NullString
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var isAdmin int
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err := s.db.QueryRowContext(
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ctx,
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`SELECT u.id, u.username, u.is_admin, u.created_at, u.last_login_at
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FROM users u
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JOIN sessions s ON s.user_id = u.id
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WHERE s.token = ? AND s.expires_at > ?`,
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token,
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time.Now().UTC().Format(time.RFC3339),
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).Scan(
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&user.ID,
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&user.Username,
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&isAdmin,
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&createdAt,
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&lastLoginAt,
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)
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if err != nil {
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return User{}, err
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}
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user.IsAdmin = isAdmin == 1
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user.CreatedAt = parseTime(createdAt)
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if lastLoginAt.Valid {
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user.LastLoginAt = parseTime(lastLoginAt.String)
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}
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return user, nil
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}
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func parseTime(raw string) time.Time {
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parsed, err := time.Parse(time.RFC3339, raw)
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if err != nil {
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return time.Time{}
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}
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return parsed
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}
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func newToken() (string, error) {
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bytes := make([]byte, 32)
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if _, err := rand.Read(bytes); err != nil {
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return "", err
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}
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return hex.EncodeToString(bytes), nil
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}
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func (s *Service) storeSubsonicSecret(ctx context.Context, userID, password string) error {
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if userID == "" || password == "" {
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return nil
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}
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encrypted, err := encryptSecret(password, s.encryptionKey)
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if err != nil {
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return err
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}
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_, err = s.db.ExecContext(ctx, `UPDATE users SET subsonic_auth_secret = ? WHERE id = ?`, encrypted, userID)
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return err
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}
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func EncryptSubsonicSecret(value, key string) (string, error) {
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return encryptSecret(value, key)
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}
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func encryptSecret(value, key string) (string, error) {
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block, err := aes.NewCipher(deriveKey(key))
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if err != nil {
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return "", err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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nonce := make([]byte, gcm.NonceSize())
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if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
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return "", err
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}
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ciphertext := gcm.Seal(nonce, nonce, []byte(value), nil)
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return base64.StdEncoding.EncodeToString(ciphertext), nil
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}
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func decryptSecret(value, key string) (string, error) {
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block, err := aes.NewCipher(deriveKey(key))
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if err != nil {
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return "", err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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raw, err := base64.StdEncoding.DecodeString(value)
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if err != nil {
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return "", err
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}
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if len(raw) < gcm.NonceSize() {
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return "", ErrUnauthorized
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}
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nonce := raw[:gcm.NonceSize()]
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ciphertext := raw[gcm.NonceSize():]
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plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
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if err != nil {
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return "", err
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}
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return string(plaintext), nil
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}
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func deriveKey(key string) []byte {
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sum := sha256.Sum256([]byte(key))
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return sum[:]
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}
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func hexMD5(value string) string {
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sum := md5.Sum([]byte(value))
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return hex.EncodeToString(sum[:])
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}
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