483 lines
14 KiB
Go
483 lines
14 KiB
Go
package auth
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import (
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"database/sql"
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"errors"
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"fmt"
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_ "github.com/mattn/go-sqlite3" // SQLite driver
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"golang.org/x/crypto/bcrypt"
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"heckel.io/ntfy/util"
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"strings"
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)
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const (
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tokenLength = 32
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bcryptCost = 10
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intentionalSlowDownHash = "$2a$10$YFCQvqQDwIIwnJM1xkAYOeih0dg17UVGanaTStnrSzC8NCWxcLDwy" // Cost should match bcryptCost
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)
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// Auther-related queries
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const (
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createAuthTablesQueries = `
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BEGIN;
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CREATE TABLE IF NOT EXISTS plan (
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id INT NOT NULL,
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name TEXT NOT NULL,
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limit_messages INT,
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PRIMARY KEY (id)
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);
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CREATE TABLE IF NOT EXISTS user (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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plan_id INT,
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user TEXT NOT NULL,
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pass TEXT NOT NULL,
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role TEXT NOT NULL,
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language TEXT,
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notification_sound TEXT,
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notification_min_priority INT,
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notification_delete_after INT,
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FOREIGN KEY (plan_id) REFERENCES plan (id)
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);
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CREATE UNIQUE INDEX idx_user ON user (user);
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CREATE TABLE IF NOT EXISTS user_access (
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user_id INT NOT NULL,
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topic TEXT NOT NULL,
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read INT NOT NULL,
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write INT NOT NULL,
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PRIMARY KEY (user_id, topic),
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FOREIGN KEY (user_id) REFERENCES user (id)
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);
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CREATE TABLE IF NOT EXISTS user_subscription (
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user_id INT NOT NULL,
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base_url TEXT NOT NULL,
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topic TEXT NOT NULL,
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PRIMARY KEY (user_id, base_url, topic)
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);
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CREATE TABLE IF NOT EXISTS user_token (
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user_id INT NOT NULL,
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token TEXT NOT NULL,
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expires INT NOT NULL,
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PRIMARY KEY (user_id, token)
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);
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CREATE TABLE IF NOT EXISTS schemaVersion (
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id INT PRIMARY KEY,
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version INT NOT NULL
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);
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INSERT INTO plan (id, name) VALUES (1, 'Admin') ON CONFLICT (id) DO NOTHING;
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INSERT INTO user (id, user, pass, role) VALUES (1, '*', '', 'anonymous') ON CONFLICT (id) DO NOTHING;
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COMMIT;
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`
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selectUserByNameQuery = `
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SELECT user, pass, role, language
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FROM user
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WHERE user = ?
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`
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selectUserByTokenQuery = `
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SELECT user, pass, role, language
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FROM user
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JOIN user_token on user.id = user_token.user_id
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WHERE token = ?
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`
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selectTopicPermsQuery = `
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SELECT read, write
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FROM user_access
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JOIN user ON user.user = '*' OR user.user = ?
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WHERE ? LIKE user_access.topic
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ORDER BY user.user DESC
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`
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)
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// Manager-related queries
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const (
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insertUserQuery = `INSERT INTO user (user, pass, role) VALUES (?, ?, ?)`
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selectUsernamesQuery = `SELECT user FROM user ORDER BY role, user`
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updateUserPassQuery = `UPDATE user SET pass = ? WHERE user = ?`
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updateUserRoleQuery = `UPDATE user SET role = ? WHERE user = ?`
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deleteUserQuery = `DELETE FROM user WHERE user = ?`
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upsertUserAccessQuery = `INSERT INTO user_access (user_id, topic, read, write) VALUES ((SELECT id FROM user WHERE user = ?), ?, ?, ?)`
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selectUserAccessQuery = `SELECT topic, read, write FROM user_access WHERE user_id = (SELECT id FROM user WHERE user = ?)`
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deleteAllAccessQuery = `DELETE FROM user_access`
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deleteUserAccessQuery = `DELETE FROM user_access WHERE user_id = (SELECT id FROM user WHERE user = ?)`
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deleteTopicAccessQuery = `DELETE FROM user_access WHERE user_id = (SELECT id FROM user WHERE user = ?) AND topic = ?`
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insertTokenQuery = `INSERT INTO user_token (user_id, token, expires) VALUES ((SELECT id FROM user WHERE user = ?), ?, ?)`
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deleteTokenQuery = `DELETE FROM user_token WHERE user_id = (SELECT id FROM user WHERE user = ?) AND token = ?`
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)
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// Schema management queries
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const (
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currentSchemaVersion = 1
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insertSchemaVersion = `INSERT INTO schemaVersion VALUES (1, ?)`
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selectSchemaVersionQuery = `SELECT version FROM schemaVersion WHERE id = 1`
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)
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// SQLiteAuth is an implementation of Auther and Manager. It stores users and access control list
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// in a SQLite database.
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type SQLiteAuth struct {
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db *sql.DB
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defaultRead bool
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defaultWrite bool
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}
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var _ Auther = (*SQLiteAuth)(nil)
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var _ Manager = (*SQLiteAuth)(nil)
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// NewSQLiteAuth creates a new SQLiteAuth instance
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func NewSQLiteAuth(filename string, defaultRead, defaultWrite bool) (*SQLiteAuth, error) {
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db, err := sql.Open("sqlite3", filename)
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if err != nil {
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return nil, err
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}
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if err := setupAuthDB(db); err != nil {
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return nil, err
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}
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return &SQLiteAuth{
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db: db,
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defaultRead: defaultRead,
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defaultWrite: defaultWrite,
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}, nil
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}
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// Authenticate checks username and password and returns a user if correct. The method
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// returns in constant-ish time, regardless of whether the user exists or the password is
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// correct or incorrect.
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func (a *SQLiteAuth) Authenticate(username, password string) (*User, error) {
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if username == Everyone {
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return nil, ErrUnauthenticated
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}
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user, err := a.User(username)
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if err != nil {
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bcrypt.CompareHashAndPassword([]byte(intentionalSlowDownHash),
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[]byte("intentional slow-down to avoid timing attacks"))
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return nil, ErrUnauthenticated
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}
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if err := bcrypt.CompareHashAndPassword([]byte(user.Hash), []byte(password)); err != nil {
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return nil, ErrUnauthenticated
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}
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return user, nil
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}
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func (a *SQLiteAuth) AuthenticateToken(token string) (*User, error) {
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user, err := a.userByToken(token)
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if err != nil {
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return nil, ErrUnauthenticated
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}
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user.Token = token
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return user, nil
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}
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func (a *SQLiteAuth) CreateToken(user *User) (string, error) {
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token := util.RandomString(tokenLength)
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expires := 1 // FIXME
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if _, err := a.db.Exec(insertTokenQuery, user.Name, token, expires); err != nil {
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return "", err
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}
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return token, nil
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}
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func (a *SQLiteAuth) RemoveToken(user *User) error {
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if user.Token == "" {
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return ErrUnauthorized
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}
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if _, err := a.db.Exec(deleteTokenQuery, user.Name, user.Token); 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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// Authorize returns nil if the given user has access to the given topic using the desired
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// permission. The user param may be nil to signal an anonymous user.
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func (a *SQLiteAuth) Authorize(user *User, topic string, perm Permission) error {
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if user != nil && user.Role == RoleAdmin {
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return nil // Admin can do everything
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}
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username := Everyone
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if user != nil {
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username = user.Name
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}
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// Select the read/write permissions for this user/topic combo. The query may return two
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// rows (one for everyone, and one for the user), but prioritizes the user. The value for
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// user.Name may be empty (= everyone).
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rows, err := a.db.Query(selectTopicPermsQuery, username, topic)
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if err != nil {
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return err
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}
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defer rows.Close()
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if !rows.Next() {
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return a.resolvePerms(a.defaultRead, a.defaultWrite, perm)
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}
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var read, write bool
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if err := rows.Scan(&read, &write); err != nil {
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return err
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} else if err := rows.Err(); err != nil {
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return err
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}
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return a.resolvePerms(read, write, perm)
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}
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func (a *SQLiteAuth) resolvePerms(read, write bool, perm Permission) error {
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if perm == PermissionRead && read {
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return nil
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} else if perm == PermissionWrite && write {
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return nil
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}
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return ErrUnauthorized
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}
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// AddUser adds a user with the given username, password and role. The password should be hashed
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// before it is stored in a persistence layer.
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func (a *SQLiteAuth) AddUser(username, password string, role Role) error {
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if !AllowedUsername(username) || !AllowedRole(role) {
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return ErrInvalidArgument
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}
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hash, err := bcrypt.GenerateFromPassword([]byte(password), bcryptCost)
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if err != nil {
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return err
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}
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if _, err = a.db.Exec(insertUserQuery, username, hash, role); 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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// RemoveUser deletes the user with the given username. The function returns nil on success, even
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// if the user did not exist in the first place.
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func (a *SQLiteAuth) RemoveUser(username string) error {
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if !AllowedUsername(username) {
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return ErrInvalidArgument
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}
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if _, err := a.db.Exec(deleteUserQuery, username); err != nil {
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return err
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}
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if _, err := a.db.Exec(deleteUserAccessQuery, username); 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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// Users returns a list of users. It always also returns the Everyone user ("*").
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func (a *SQLiteAuth) Users() ([]*User, error) {
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rows, err := a.db.Query(selectUsernamesQuery)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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usernames := make([]string, 0)
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for rows.Next() {
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var username string
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if err := rows.Scan(&username); err != nil {
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return nil, err
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} else if err := rows.Err(); err != nil {
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return nil, err
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}
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usernames = append(usernames, username)
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}
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rows.Close()
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users := make([]*User, 0)
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for _, username := range usernames {
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user, err := a.User(username)
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if err != nil {
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return nil, err
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}
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users = append(users, user)
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}
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everyone, err := a.everyoneUser()
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if err != nil {
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return nil, err
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}
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users = append(users, everyone)
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return users, nil
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}
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// User returns the user with the given username if it exists, or ErrNotFound otherwise.
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// You may also pass Everyone to retrieve the anonymous user and its Grant list.
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func (a *SQLiteAuth) User(username string) (*User, error) {
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if username == Everyone {
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return a.everyoneUser()
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}
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rows, err := a.db.Query(selectUserByNameQuery, username)
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if err != nil {
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return nil, err
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}
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return a.readUser(rows)
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}
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func (a *SQLiteAuth) userByToken(token string) (*User, error) {
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rows, err := a.db.Query(selectUserByTokenQuery, token)
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if err != nil {
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return nil, err
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}
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return a.readUser(rows)
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}
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func (a *SQLiteAuth) readUser(rows *sql.Rows) (*User, error) {
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defer rows.Close()
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var username, hash, role string
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var language sql.NullString
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if !rows.Next() {
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return nil, ErrNotFound
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}
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if err := rows.Scan(&username, &hash, &role, &language); err != nil {
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return nil, err
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} else if err := rows.Err(); err != nil {
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return nil, err
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}
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grants, err := a.readGrants(username)
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if err != nil {
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return nil, err
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}
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return &User{
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Name: username,
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Hash: hash,
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Role: Role(role),
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Grants: grants,
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Language: language.String,
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}, nil
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}
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func (a *SQLiteAuth) everyoneUser() (*User, error) {
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grants, err := a.readGrants(Everyone)
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if err != nil {
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return nil, err
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}
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return &User{
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Name: Everyone,
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Hash: "",
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Role: RoleAnonymous,
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Grants: grants,
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}, nil
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}
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func (a *SQLiteAuth) readGrants(username string) ([]Grant, error) {
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rows, err := a.db.Query(selectUserAccessQuery, username)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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grants := make([]Grant, 0)
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for rows.Next() {
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var topic string
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var read, write bool
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if err := rows.Scan(&topic, &read, &write); err != nil {
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return nil, err
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} else if err := rows.Err(); err != nil {
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return nil, err
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}
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grants = append(grants, Grant{
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TopicPattern: fromSQLWildcard(topic),
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AllowRead: read,
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AllowWrite: write,
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})
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}
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return grants, nil
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}
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// ChangePassword changes a user's password
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func (a *SQLiteAuth) ChangePassword(username, password string) error {
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hash, err := bcrypt.GenerateFromPassword([]byte(password), bcryptCost)
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if err != nil {
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return err
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}
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if _, err := a.db.Exec(updateUserPassQuery, hash, username); 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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// ChangeRole changes a user's role. When a role is changed from RoleUser to RoleAdmin,
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// all existing access control entries (Grant) are removed, since they are no longer needed.
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func (a *SQLiteAuth) ChangeRole(username string, role Role) error {
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if !AllowedUsername(username) || !AllowedRole(role) {
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return ErrInvalidArgument
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}
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if _, err := a.db.Exec(updateUserRoleQuery, string(role), username); err != nil {
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return err
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}
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if role == RoleAdmin {
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if _, err := a.db.Exec(deleteUserAccessQuery, username); err != nil {
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return err
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}
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}
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return nil
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}
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// AllowAccess adds or updates an entry in th access control list for a specific user. It controls
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// read/write access to a topic. The parameter topicPattern may include wildcards (*).
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func (a *SQLiteAuth) AllowAccess(username string, topicPattern string, read bool, write bool) error {
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if (!AllowedUsername(username) && username != Everyone) || !AllowedTopicPattern(topicPattern) {
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return ErrInvalidArgument
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}
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if _, err := a.db.Exec(upsertUserAccessQuery, username, toSQLWildcard(topicPattern), read, write); 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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// ResetAccess removes an access control list entry for a specific username/topic, or (if topic is
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// empty) for an entire user. The parameter topicPattern may include wildcards (*).
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func (a *SQLiteAuth) ResetAccess(username string, topicPattern string) error {
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if !AllowedUsername(username) && username != Everyone && username != "" {
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return ErrInvalidArgument
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} else if !AllowedTopicPattern(topicPattern) && topicPattern != "" {
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return ErrInvalidArgument
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}
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if username == "" && topicPattern == "" {
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_, err := a.db.Exec(deleteAllAccessQuery, username)
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return err
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} else if topicPattern == "" {
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_, err := a.db.Exec(deleteUserAccessQuery, username)
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return err
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}
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_, err := a.db.Exec(deleteTopicAccessQuery, username, toSQLWildcard(topicPattern))
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return err
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}
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// DefaultAccess returns the default read/write access if no access control entry matches
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func (a *SQLiteAuth) DefaultAccess() (read bool, write bool) {
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return a.defaultRead, a.defaultWrite
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}
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func toSQLWildcard(s string) string {
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return strings.ReplaceAll(s, "*", "%")
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}
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func fromSQLWildcard(s string) string {
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return strings.ReplaceAll(s, "%", "*")
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}
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func setupAuthDB(db *sql.DB) error {
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// If 'schemaVersion' table does not exist, this must be a new database
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rowsSV, err := db.Query(selectSchemaVersionQuery)
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if err != nil {
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return setupNewAuthDB(db)
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}
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defer rowsSV.Close()
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// If 'schemaVersion' table exists, read version and potentially upgrade
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schemaVersion := 0
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if !rowsSV.Next() {
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return errors.New("cannot determine schema version: database file may be corrupt")
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}
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if err := rowsSV.Scan(&schemaVersion); err != nil {
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return err
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}
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rowsSV.Close()
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// Do migrations
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if schemaVersion == currentSchemaVersion {
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return nil
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}
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return fmt.Errorf("unexpected schema version found: %d", schemaVersion)
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}
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func setupNewAuthDB(db *sql.DB) error {
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if _, err := db.Exec(createAuthTablesQueries); err != nil {
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return err
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}
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if _, err := db.Exec(insertSchemaVersion, currentSchemaVersion); 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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