package user import ( "database/sql" "encoding/json" "errors" "fmt" _ "github.com/mattn/go-sqlite3" // SQLite driver "golang.org/x/crypto/bcrypt" "heckel.io/ntfy/log" "heckel.io/ntfy/util" "strings" "sync" "time" ) const ( tokenLength = 32 bcryptCost = 10 intentionalSlowDownHash = "$2a$10$YFCQvqQDwIIwnJM1xkAYOeih0dg17UVGanaTStnrSzC8NCWxcLDwy" // Cost should match bcryptCost userStatsQueueWriterInterval = 33 * time.Second userTokenExpiryDuration = 72 * time.Hour ) var ( errNoTokenProvided = errors.New("no token provided") errTopicOwnedByOthers = errors.New("topic owned by others") ) // Manager-related queries const ( createTablesQueriesNoTx = ` CREATE TABLE IF NOT EXISTS plan ( id INT NOT NULL, code TEXT NOT NULL, messages_limit INT NOT NULL, emails_limit INT NOT NULL, topics_limit INT NOT NULL, attachment_file_size_limit INT NOT NULL, attachment_total_size_limit INT NOT NULL, PRIMARY KEY (id) ); CREATE TABLE IF NOT EXISTS user ( id INTEGER PRIMARY KEY AUTOINCREMENT, plan_id INT, user TEXT NOT NULL, pass TEXT NOT NULL, role TEXT NOT NULL, messages INT NOT NULL DEFAULT (0), emails INT NOT NULL DEFAULT (0), settings JSON, FOREIGN KEY (plan_id) REFERENCES plan (id) ); CREATE UNIQUE INDEX idx_user ON user (user); CREATE TABLE IF NOT EXISTS user_access ( user_id INT NOT NULL, topic TEXT NOT NULL, read INT NOT NULL, write INT NOT NULL, owner_user_id INT, PRIMARY KEY (user_id, topic), FOREIGN KEY (user_id) REFERENCES user (id) ON DELETE CASCADE ); CREATE TABLE IF NOT EXISTS user_token ( user_id INT NOT NULL, token TEXT NOT NULL, expires INT NOT NULL, PRIMARY KEY (user_id, token), FOREIGN KEY (user_id) REFERENCES user (id) ON DELETE CASCADE ); CREATE TABLE IF NOT EXISTS schemaVersion ( id INT PRIMARY KEY, version INT NOT NULL ); INSERT INTO user (id, user, pass, role) VALUES (1, '*', '', 'anonymous') ON CONFLICT (id) DO NOTHING; ` createTablesQueries = `BEGIN; ` + createTablesQueriesNoTx + ` COMMIT;` selectUserByNameQuery = ` SELECT u.user, u.pass, u.role, u.messages, u.emails, u.settings, p.code, p.messages_limit, p.emails_limit, p.topics_limit, p.attachment_file_size_limit, p.attachment_total_size_limit FROM user u LEFT JOIN plan p on p.id = u.plan_id WHERE user = ? ` selectUserByTokenQuery = ` SELECT u.user, u.pass, u.role, u.messages, u.emails, u.settings, p.code, p.messages_limit, p.emails_limit, p.topics_limit, p.attachment_file_size_limit, p.attachment_total_size_limit FROM user u JOIN user_token t on u.id = t.user_id LEFT JOIN plan p on p.id = u.plan_id WHERE t.token = ? AND t.expires >= ? ` selectTopicPermsQuery = ` SELECT read, write FROM user_access a JOIN user u ON u.id = a.user_id WHERE (u.user = ? OR u.user = ?) AND ? LIKE a.topic ORDER BY u.user DESC ` ) // Manager-related queries const ( insertUserQuery = `INSERT INTO user (user, pass, role) VALUES (?, ?, ?)` selectUsernamesQuery = ` SELECT user FROM user ORDER BY CASE role WHEN 'admin' THEN 1 WHEN 'anonymous' THEN 3 ELSE 2 END, user ` updateUserPassQuery = `UPDATE user SET pass = ? WHERE user = ?` updateUserRoleQuery = `UPDATE user SET role = ? WHERE user = ?` updateUserSettingsQuery = `UPDATE user SET settings = ? WHERE user = ?` updateUserStatsQuery = `UPDATE user SET messages = ?, emails = ? WHERE user = ?` deleteUserQuery = `DELETE FROM user WHERE user = ?` upsertUserAccessQuery = ` INSERT INTO user_access (user_id, topic, read, write, owner_user_id) VALUES ((SELECT id FROM user WHERE user = ?), ?, ?, ?, (SELECT IIF(?='',NULL,(SELECT id FROM user WHERE user=?)))) ON CONFLICT (user_id, topic) DO UPDATE SET read=excluded.read, write=excluded.write, owner_user_id=excluded.owner_user_id ` selectUserAccessQuery = ` SELECT topic, read, write FROM user_access WHERE user_id = (SELECT id FROM user WHERE user = ?) ORDER BY write DESC, read DESC, topic ` selectUserReservationsQuery = ` SELECT a_user.topic, a_user.read, a_user.write, a_everyone.read AS everyone_read, a_everyone.write AS everyone_write FROM user_access a_user LEFT JOIN user_access a_everyone ON a_user.topic = a_everyone.topic AND a_everyone.user_id = (SELECT id FROM user WHERE user = ?) WHERE a_user.user_id = a_user.owner_user_id AND a_user.owner_user_id = (SELECT id FROM user WHERE user = ?) ORDER BY a_user.topic ` selectOtherAccessCountQuery = ` SELECT count(*) FROM user_access WHERE (topic = ? OR ? LIKE topic) AND (owner_user_id IS NULL OR owner_user_id != (SELECT id FROM user WHERE user = ?)) ` deleteAllAccessQuery = `DELETE FROM user_access` deleteUserAccessQuery = `DELETE FROM user_access WHERE user_id = (SELECT id FROM user WHERE user = ?)` deleteTopicAccessQuery = `DELETE FROM user_access WHERE user_id = (SELECT id FROM user WHERE user = ?) AND topic = ?` insertTokenQuery = `INSERT INTO user_token (user_id, token, expires) VALUES ((SELECT id FROM user WHERE user = ?), ?, ?)` updateTokenExpiryQuery = `UPDATE user_token SET expires = ? WHERE user_id = (SELECT id FROM user WHERE user = ?) AND token = ?` deleteTokenQuery = `DELETE FROM user_token WHERE user_id = (SELECT id FROM user WHERE user = ?) AND token = ?` deleteExpiredTokensQuery = `DELETE FROM user_token WHERE expires < ?` deleteUserTokensQuery = `DELETE FROM user_token WHERE user_id = (SELECT id FROM user WHERE user = ?)` ) // Schema management queries const ( currentSchemaVersion = 2 insertSchemaVersion = `INSERT INTO schemaVersion VALUES (1, ?)` updateSchemaVersion = `UPDATE schemaVersion SET version = ? WHERE id = 1` selectSchemaVersionQuery = `SELECT version FROM schemaVersion WHERE id = 1` // 1 -> 2 (complex migration!) migrate1To2RenameUserTableQueryNoTx = ` ALTER TABLE user RENAME TO user_old; ` migrate1To2InsertFromOldTablesAndDropNoTx = ` INSERT INTO user (user, pass, role) SELECT user, pass, role FROM user_old; INSERT INTO user_access (user_id, topic, read, write) SELECT u.id, a.topic, a.read, a.write FROM user u JOIN access a ON u.user = a.user; DROP TABLE access; DROP TABLE user_old; ` ) // Manager is an implementation of Manager. It stores users and access control list // in a SQLite database. type Manager struct { db *sql.DB defaultAccess Permission // Default permission if no ACL matches statsQueue map[string]*User // Username -> User, for "unimportant" user updates tokenExpiryInterval time.Duration // Duration after which tokens expire, and by which tokens are extended mu sync.Mutex } var _ Auther = (*Manager)(nil) // NewManager creates a new Manager instance func NewManager(filename string, defaultAccess Permission) (*Manager, error) { return newManager(filename, defaultAccess, userTokenExpiryDuration, userStatsQueueWriterInterval) } // NewManager creates a new Manager instance func newManager(filename string, defaultAccess Permission, tokenExpiryDuration, statsWriterInterval time.Duration) (*Manager, error) { db, err := sql.Open("sqlite3", filename) if err != nil { return nil, err } if err := setupDB(db); err != nil { return nil, err } manager := &Manager{ db: db, defaultAccess: defaultAccess, statsQueue: make(map[string]*User), tokenExpiryInterval: tokenExpiryDuration, } go manager.userStatsQueueWriter(statsWriterInterval) return manager, nil } // Authenticate checks username and password and returns a User if correct. The method // returns in constant-ish time, regardless of whether the user exists or the password is // correct or incorrect. func (a *Manager) Authenticate(username, password string) (*User, error) { if username == Everyone { return nil, ErrUnauthenticated } user, err := a.User(username) if err != nil { bcrypt.CompareHashAndPassword([]byte(intentionalSlowDownHash), []byte("intentional slow-down to avoid timing attacks")) return nil, ErrUnauthenticated } if err := bcrypt.CompareHashAndPassword([]byte(user.Hash), []byte(password)); err != nil { return nil, ErrUnauthenticated } return user, nil } // AuthenticateToken checks if the token exists and returns the associated User if it does. // The method sets the User.Token value to the token that was used for authentication. func (a *Manager) AuthenticateToken(token string) (*User, error) { if len(token) != tokenLength { return nil, ErrUnauthenticated } user, err := a.userByToken(token) if err != nil { return nil, ErrUnauthenticated } user.Token = token return user, nil } // CreateToken generates a random token for the given user and returns it. The token expires // after a fixed duration unless ExtendToken is called. func (a *Manager) CreateToken(user *User) (*Token, error) { token, expires := util.RandomString(tokenLength), time.Now().Add(userTokenExpiryDuration) if _, err := a.db.Exec(insertTokenQuery, user.Name, token, expires.Unix()); err != nil { return nil, err } return &Token{ Value: token, Expires: expires, }, nil } // ExtendToken sets the new expiry date for a token, thereby extending its use further into the future. func (a *Manager) ExtendToken(user *User) (*Token, error) { if user.Token == "" { return nil, errNoTokenProvided } newExpires := time.Now().Add(userTokenExpiryDuration) if _, err := a.db.Exec(updateTokenExpiryQuery, newExpires.Unix(), user.Name, user.Token); err != nil { return nil, err } return &Token{ Value: user.Token, Expires: newExpires, }, nil } // RemoveToken deletes the token defined in User.Token func (a *Manager) RemoveToken(user *User) error { if user.Token == "" { return ErrUnauthorized } if _, err := a.db.Exec(deleteTokenQuery, user.Name, user.Token); err != nil { return err } return nil } // RemoveExpiredTokens deletes all expired tokens from the database func (a *Manager) RemoveExpiredTokens() error { if _, err := a.db.Exec(deleteExpiredTokensQuery, time.Now().Unix()); err != nil { return err } return nil } // ChangeSettings persists the user settings func (a *Manager) ChangeSettings(user *User) error { settings, err := json.Marshal(user.Prefs) if err != nil { return err } if _, err := a.db.Exec(updateUserSettingsQuery, string(settings), user.Name); err != nil { return err } return nil } // EnqueueStats adds the user to a queue which writes out user stats (messages, emails, ..) in // batches at a regular interval func (a *Manager) EnqueueStats(user *User) { a.mu.Lock() defer a.mu.Unlock() a.statsQueue[user.Name] = user } func (a *Manager) userStatsQueueWriter(interval time.Duration) { ticker := time.NewTicker(interval) for range ticker.C { if err := a.writeUserStatsQueue(); err != nil { log.Warn("UserManager: Writing user stats queue failed: %s", err.Error()) } } } func (a *Manager) writeUserStatsQueue() error { a.mu.Lock() if len(a.statsQueue) == 0 { a.mu.Unlock() log.Trace("UserManager: No user stats updates to commit") return nil } statsQueue := a.statsQueue a.statsQueue = make(map[string]*User) a.mu.Unlock() tx, err := a.db.Begin() if err != nil { return err } defer tx.Rollback() log.Debug("UserManager: Writing user stats queue for %d user(s)", len(statsQueue)) for username, u := range statsQueue { log.Trace("UserManager: Updating stats for user %s: messages=%d, emails=%d", username, u.Stats.Messages, u.Stats.Emails) if _, err := tx.Exec(updateUserStatsQuery, u.Stats.Messages, u.Stats.Emails, username); err != nil { return err } } return tx.Commit() } // Authorize returns nil if the given user has access to the given topic using the desired // permission. The user param may be nil to signal an anonymous user. func (a *Manager) Authorize(user *User, topic string, perm Permission) error { if user != nil && user.Role == RoleAdmin { return nil // Admin can do everything } username := Everyone if user != nil { username = user.Name } // Select the read/write permissions for this user/topic combo. The query may return two // rows (one for everyone, and one for the user), but prioritizes the user. rows, err := a.db.Query(selectTopicPermsQuery, Everyone, username, topic) if err != nil { return err } defer rows.Close() if !rows.Next() { return a.resolvePerms(a.defaultAccess, perm) } var read, write bool if err := rows.Scan(&read, &write); err != nil { return err } else if err := rows.Err(); err != nil { return err } return a.resolvePerms(NewPermission(read, write), perm) } func (a *Manager) resolvePerms(base, perm Permission) error { if perm == PermissionRead && base.IsRead() { return nil } else if perm == PermissionWrite && base.IsWrite() { return nil } return ErrUnauthorized } // AddUser adds a user with the given username, password and role func (a *Manager) AddUser(username, password string, role Role) error { if !AllowedUsername(username) || !AllowedRole(role) { return ErrInvalidArgument } hash, err := bcrypt.GenerateFromPassword([]byte(password), bcryptCost) if err != nil { return err } if _, err = a.db.Exec(insertUserQuery, username, hash, role); err != nil { return err } return nil } // RemoveUser deletes the user with the given username. The function returns nil on success, even // if the user did not exist in the first place. func (a *Manager) RemoveUser(username string) error { if !AllowedUsername(username) { return ErrInvalidArgument } tx, err := a.db.Begin() if err != nil { return err } defer tx.Rollback() if _, err := tx.Exec(deleteUserAccessQuery, username); err != nil { return err } if _, err := tx.Exec(deleteUserTokensQuery, username); err != nil { return err } if _, err := tx.Exec(deleteUserQuery, username); err != nil { return err } return tx.Commit() } // Users returns a list of users. It always also returns the Everyone user ("*"). func (a *Manager) Users() ([]*User, error) { rows, err := a.db.Query(selectUsernamesQuery) if err != nil { return nil, err } defer rows.Close() usernames := make([]string, 0) for rows.Next() { var username string if err := rows.Scan(&username); err != nil { return nil, err } else if err := rows.Err(); err != nil { return nil, err } usernames = append(usernames, username) } rows.Close() users := make([]*User, 0) for _, username := range usernames { user, err := a.User(username) if err != nil { return nil, err } users = append(users, user) } return users, nil } // User returns the user with the given username if it exists, or ErrNotFound otherwise. // You may also pass Everyone to retrieve the anonymous user and its Grant list. func (a *Manager) User(username string) (*User, error) { rows, err := a.db.Query(selectUserByNameQuery, username) if err != nil { return nil, err } return a.readUser(rows) } func (a *Manager) userByToken(token string) (*User, error) { rows, err := a.db.Query(selectUserByTokenQuery, token, time.Now().Unix()) if err != nil { return nil, err } return a.readUser(rows) } func (a *Manager) readUser(rows *sql.Rows) (*User, error) { defer rows.Close() var username, hash, role string var settings, planCode sql.NullString var messages, emails int64 var messagesLimit, emailsLimit, topicsLimit, attachmentFileSizeLimit, attachmentTotalSizeLimit sql.NullInt64 if !rows.Next() { return nil, ErrNotFound } if err := rows.Scan(&username, &hash, &role, &messages, &emails, &settings, &planCode, &messagesLimit, &emailsLimit, &topicsLimit, &attachmentFileSizeLimit, &attachmentTotalSizeLimit); err != nil { return nil, err } else if err := rows.Err(); err != nil { return nil, err } user := &User{ Name: username, Hash: hash, Role: Role(role), Stats: &Stats{ Messages: messages, Emails: emails, }, } if settings.Valid { user.Prefs = &Prefs{} if err := json.Unmarshal([]byte(settings.String), user.Prefs); err != nil { return nil, err } } if planCode.Valid { user.Plan = &Plan{ Code: planCode.String, Upgradeable: false, MessagesLimit: messagesLimit.Int64, EmailsLimit: emailsLimit.Int64, TopicsLimit: topicsLimit.Int64, AttachmentFileSizeLimit: attachmentFileSizeLimit.Int64, AttachmentTotalSizeLimit: attachmentTotalSizeLimit.Int64, } } return user, nil } // Grants returns all user-specific access control entries func (a *Manager) Grants(username string) ([]Grant, error) { rows, err := a.db.Query(selectUserAccessQuery, username) if err != nil { return nil, err } defer rows.Close() grants := make([]Grant, 0) for rows.Next() { var topic string var read, write bool if err := rows.Scan(&topic, &read, &write); err != nil { return nil, err } else if err := rows.Err(); err != nil { return nil, err } grants = append(grants, Grant{ TopicPattern: fromSQLWildcard(topic), Allow: NewPermission(read, write), }) } return grants, nil } // Reservations returns all user-owned topics, and the associated everyone-access func (a *Manager) Reservations(username string) ([]Reservation, error) { rows, err := a.db.Query(selectUserReservationsQuery, Everyone, username) if err != nil { return nil, err } defer rows.Close() reservations := make([]Reservation, 0) for rows.Next() { var topic string var ownerRead, ownerWrite bool var everyoneRead, everyoneWrite sql.NullBool if err := rows.Scan(&topic, &ownerRead, &ownerWrite, &everyoneRead, &everyoneWrite); err != nil { return nil, err } else if err := rows.Err(); err != nil { return nil, err } reservations = append(reservations, Reservation{ Topic: topic, Owner: NewPermission(ownerRead, ownerWrite), Everyone: NewPermission(everyoneRead.Bool, everyoneWrite.Bool), // false if null }) } return reservations, nil } // ChangePassword changes a user's password func (a *Manager) ChangePassword(username, password string) error { hash, err := bcrypt.GenerateFromPassword([]byte(password), bcryptCost) if err != nil { return err } if _, err := a.db.Exec(updateUserPassQuery, hash, username); err != nil { return err } return nil } // ChangeRole changes a user's role. When a role is changed from RoleUser to RoleAdmin, // all existing access control entries (Grant) are removed, since they are no longer needed. func (a *Manager) ChangeRole(username string, role Role) error { if !AllowedUsername(username) || !AllowedRole(role) { return ErrInvalidArgument } if _, err := a.db.Exec(updateUserRoleQuery, string(role), username); err != nil { return err } if role == RoleAdmin { if _, err := a.db.Exec(deleteUserAccessQuery, username); err != nil { return err } } return nil } // CheckAllowAccess tests if a user may create an access control entry for the given topic. // If there are any ACL entries that are not owned by the user, an error is returned. func (a *Manager) CheckAllowAccess(username string, topic string) error { if (!AllowedUsername(username) && username != Everyone) || !AllowedTopic(topic) { return ErrInvalidArgument } rows, err := a.db.Query(selectOtherAccessCountQuery, topic, topic, username) if err != nil { return err } defer rows.Close() if !rows.Next() { return errors.New("no rows found") } var otherCount int if err := rows.Scan(&otherCount); err != nil { return err } if otherCount > 0 { return errTopicOwnedByOthers } return nil } // AllowAccess adds or updates an entry in th access control list for a specific user. It controls // read/write access to a topic. The parameter topicPattern may include wildcards (*). The ACL entry // owner may either be a user (username), or the system (empty). func (a *Manager) AllowAccess(owner, username string, topicPattern string, read bool, write bool) error { if !AllowedUsername(username) && username != Everyone { return ErrInvalidArgument } else if owner != "" && !AllowedUsername(owner) { return ErrInvalidArgument } else if !AllowedTopicPattern(topicPattern) { return ErrInvalidArgument } if _, err := a.db.Exec(upsertUserAccessQuery, username, toSQLWildcard(topicPattern), read, write, owner, owner); err != nil { return err } return nil } // ResetAccess removes an access control list entry for a specific username/topic, or (if topic is // empty) for an entire user. The parameter topicPattern may include wildcards (*). func (a *Manager) ResetAccess(username string, topicPattern string) error { if !AllowedUsername(username) && username != Everyone && username != "" { return ErrInvalidArgument } else if !AllowedTopicPattern(topicPattern) && topicPattern != "" { return ErrInvalidArgument } if username == "" && topicPattern == "" { _, err := a.db.Exec(deleteAllAccessQuery, username) return err } else if topicPattern == "" { _, err := a.db.Exec(deleteUserAccessQuery, username) return err } _, err := a.db.Exec(deleteTopicAccessQuery, username, toSQLWildcard(topicPattern)) return err } // DefaultAccess returns the default read/write access if no access control entry matches func (a *Manager) DefaultAccess() Permission { return a.defaultAccess } func toSQLWildcard(s string) string { return strings.ReplaceAll(s, "*", "%") } func fromSQLWildcard(s string) string { return strings.ReplaceAll(s, "%", "*") } func setupDB(db *sql.DB) error { // If 'schemaVersion' table does not exist, this must be a new database rowsSV, err := db.Query(selectSchemaVersionQuery) if err != nil { return setupNewDB(db) } defer rowsSV.Close() // If 'schemaVersion' table exists, read version and potentially upgrade schemaVersion := 0 if !rowsSV.Next() { return errors.New("cannot determine schema version: database file may be corrupt") } if err := rowsSV.Scan(&schemaVersion); err != nil { return err } rowsSV.Close() // Do migrations if schemaVersion == currentSchemaVersion { return nil } else if schemaVersion == 1 { return migrateFrom1(db) } return fmt.Errorf("unexpected schema version found: %d", schemaVersion) } func setupNewDB(db *sql.DB) error { if _, err := db.Exec(createTablesQueries); err != nil { return err } if _, err := db.Exec(insertSchemaVersion, currentSchemaVersion); err != nil { return err } return nil } func migrateFrom1(db *sql.DB) error { log.Info("Migrating user database schema: from 1 to 2") tx, err := db.Begin() if err != nil { return err } defer tx.Rollback() if _, err := tx.Exec(migrate1To2RenameUserTableQueryNoTx); err != nil { return err } if _, err := tx.Exec(createTablesQueriesNoTx); err != nil { return err } if _, err := tx.Exec(migrate1To2InsertFromOldTablesAndDropNoTx); err != nil { return err } if _, err := tx.Exec(updateSchemaVersion, 2); err != nil { return err } if err := tx.Commit(); err != nil { return err } return nil // Update this when a new version is added }