492 lines
14 KiB
Go
492 lines
14 KiB
Go
package auth
|
|
|
|
import (
|
|
"database/sql"
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
_ "github.com/mattn/go-sqlite3" // SQLite driver
|
|
"golang.org/x/crypto/bcrypt"
|
|
"heckel.io/ntfy/util"
|
|
"strings"
|
|
)
|
|
|
|
const (
|
|
tokenLength = 32
|
|
bcryptCost = 10
|
|
intentionalSlowDownHash = "$2a$10$YFCQvqQDwIIwnJM1xkAYOeih0dg17UVGanaTStnrSzC8NCWxcLDwy" // Cost should match bcryptCost
|
|
)
|
|
|
|
// Manager-related queries
|
|
const (
|
|
createAuthTablesQueries = `
|
|
BEGIN;
|
|
CREATE TABLE IF NOT EXISTS plan (
|
|
id INT NOT NULL,
|
|
name TEXT NOT NULL,
|
|
limit_messages INT,
|
|
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,
|
|
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,
|
|
PRIMARY KEY (user_id, topic),
|
|
FOREIGN KEY (user_id) REFERENCES user (id)
|
|
);
|
|
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)
|
|
);
|
|
CREATE TABLE IF NOT EXISTS schemaVersion (
|
|
id INT PRIMARY KEY,
|
|
version INT NOT NULL
|
|
);
|
|
INSERT INTO plan (id, name) VALUES (1, 'Admin') ON CONFLICT (id) DO NOTHING;
|
|
INSERT INTO user (id, user, pass, role) VALUES (1, '*', '', 'anonymous') ON CONFLICT (id) DO NOTHING;
|
|
COMMIT;
|
|
`
|
|
selectUserByNameQuery = `
|
|
SELECT user, pass, role, settings
|
|
FROM user
|
|
WHERE user = ?
|
|
`
|
|
selectUserByTokenQuery = `
|
|
SELECT user, pass, role, settings
|
|
FROM user
|
|
JOIN user_token on user.id = user_token.user_id
|
|
WHERE token = ?
|
|
`
|
|
selectTopicPermsQuery = `
|
|
SELECT read, write
|
|
FROM user_access
|
|
JOIN user ON user.user = '*' OR user.user = ?
|
|
WHERE ? LIKE user_access.topic
|
|
ORDER BY user.user DESC
|
|
`
|
|
)
|
|
|
|
// Manager-related queries
|
|
const (
|
|
insertUserQuery = `INSERT INTO user (user, pass, role) VALUES (?, ?, ?)`
|
|
selectUsernamesQuery = `SELECT user FROM user ORDER BY role, user`
|
|
updateUserPassQuery = `UPDATE user SET pass = ? WHERE user = ?`
|
|
updateUserRoleQuery = `UPDATE user SET role = ? WHERE user = ?`
|
|
deleteUserQuery = `DELETE FROM user WHERE user = ?`
|
|
|
|
upsertUserAccessQuery = `INSERT INTO user_access (user_id, topic, read, write) VALUES ((SELECT id FROM user WHERE user = ?), ?, ?, ?)`
|
|
selectUserAccessQuery = `SELECT topic, read, write FROM user_access WHERE 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 = ?), ?, ?)`
|
|
deleteTokenQuery = `DELETE FROM user_token WHERE user_id = (SELECT id FROM user WHERE user = ?) AND token = ?`
|
|
updateUserSettingsQuery = `UPDATE user SET settings = ? WHERE user = ?`
|
|
)
|
|
|
|
// Schema management queries
|
|
const (
|
|
currentSchemaVersion = 1
|
|
insertSchemaVersion = `INSERT INTO schemaVersion VALUES (1, ?)`
|
|
selectSchemaVersionQuery = `SELECT version FROM schemaVersion WHERE id = 1`
|
|
)
|
|
|
|
// SQLiteAuthManager is an implementation of Manager and Manager. It stores users and access control list
|
|
// in a SQLite database.
|
|
type SQLiteAuthManager struct {
|
|
db *sql.DB
|
|
defaultRead bool
|
|
defaultWrite bool
|
|
}
|
|
|
|
var _ Manager = (*SQLiteAuthManager)(nil)
|
|
|
|
// NewSQLiteAuthManager creates a new SQLiteAuthManager instance
|
|
func NewSQLiteAuthManager(filename string, defaultRead, defaultWrite bool) (*SQLiteAuthManager, error) {
|
|
db, err := sql.Open("sqlite3", filename)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if err := setupAuthDB(db); err != nil {
|
|
return nil, err
|
|
}
|
|
return &SQLiteAuthManager{
|
|
db: db,
|
|
defaultRead: defaultRead,
|
|
defaultWrite: defaultWrite,
|
|
}, 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 *SQLiteAuthManager) 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
|
|
}
|
|
|
|
func (a *SQLiteAuthManager) AuthenticateToken(token string) (*User, error) {
|
|
user, err := a.userByToken(token)
|
|
if err != nil {
|
|
return nil, ErrUnauthenticated
|
|
}
|
|
user.Token = token
|
|
return user, nil
|
|
}
|
|
|
|
func (a *SQLiteAuthManager) CreateToken(user *User) (string, error) {
|
|
token := util.RandomString(tokenLength)
|
|
expires := 1 // FIXME
|
|
if _, err := a.db.Exec(insertTokenQuery, user.Name, token, expires); err != nil {
|
|
return "", err
|
|
}
|
|
return token, nil
|
|
}
|
|
|
|
func (a *SQLiteAuthManager) 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
|
|
}
|
|
|
|
func (a *SQLiteAuthManager) 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
|
|
}
|
|
|
|
// 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 *SQLiteAuthManager) 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. The value for
|
|
// user.Name may be empty (= everyone).
|
|
rows, err := a.db.Query(selectTopicPermsQuery, username, topic)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer rows.Close()
|
|
if !rows.Next() {
|
|
return a.resolvePerms(a.defaultRead, a.defaultWrite, 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(read, write, perm)
|
|
}
|
|
|
|
func (a *SQLiteAuthManager) resolvePerms(read, write bool, perm Permission) error {
|
|
if perm == PermissionRead && read {
|
|
return nil
|
|
} else if perm == PermissionWrite && write {
|
|
return nil
|
|
}
|
|
return ErrUnauthorized
|
|
}
|
|
|
|
// AddUser adds a user with the given username, password and role. The password should be hashed
|
|
// before it is stored in a persistence layer.
|
|
func (a *SQLiteAuthManager) 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 *SQLiteAuthManager) RemoveUser(username string) error {
|
|
if !AllowedUsername(username) {
|
|
return ErrInvalidArgument
|
|
}
|
|
if _, err := a.db.Exec(deleteUserQuery, username); err != nil {
|
|
return err
|
|
}
|
|
if _, err := a.db.Exec(deleteUserAccessQuery, username); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Users returns a list of users. It always also returns the Everyone user ("*").
|
|
func (a *SQLiteAuthManager) 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)
|
|
}
|
|
everyone, err := a.everyoneUser()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
users = append(users, everyone)
|
|
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 *SQLiteAuthManager) User(username string) (*User, error) {
|
|
if username == Everyone {
|
|
return a.everyoneUser()
|
|
}
|
|
rows, err := a.db.Query(selectUserByNameQuery, username)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return a.readUser(rows)
|
|
}
|
|
|
|
func (a *SQLiteAuthManager) userByToken(token string) (*User, error) {
|
|
rows, err := a.db.Query(selectUserByTokenQuery, token)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return a.readUser(rows)
|
|
}
|
|
|
|
func (a *SQLiteAuthManager) readUser(rows *sql.Rows) (*User, error) {
|
|
defer rows.Close()
|
|
var username, hash, role string
|
|
var prefs sql.NullString
|
|
if !rows.Next() {
|
|
return nil, ErrNotFound
|
|
}
|
|
if err := rows.Scan(&username, &hash, &role, &prefs); err != nil {
|
|
return nil, err
|
|
} else if err := rows.Err(); err != nil {
|
|
return nil, err
|
|
}
|
|
grants, err := a.readGrants(username)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
user := &User{
|
|
Name: username,
|
|
Hash: hash,
|
|
Role: Role(role),
|
|
Grants: grants,
|
|
}
|
|
if prefs.Valid {
|
|
user.Prefs = &UserPrefs{}
|
|
if err := json.Unmarshal([]byte(prefs.String), user.Prefs); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
return user, nil
|
|
}
|
|
|
|
func (a *SQLiteAuthManager) everyoneUser() (*User, error) {
|
|
grants, err := a.readGrants(Everyone)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &User{
|
|
Name: Everyone,
|
|
Hash: "",
|
|
Role: RoleAnonymous,
|
|
Grants: grants,
|
|
}, nil
|
|
}
|
|
|
|
func (a *SQLiteAuthManager) readGrants(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),
|
|
AllowRead: read,
|
|
AllowWrite: write,
|
|
})
|
|
}
|
|
return grants, nil
|
|
}
|
|
|
|
// ChangePassword changes a user's password
|
|
func (a *SQLiteAuthManager) 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 *SQLiteAuthManager) 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
|
|
}
|
|
|
|
// 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 (*).
|
|
func (a *SQLiteAuthManager) AllowAccess(username string, topicPattern string, read bool, write bool) error {
|
|
if (!AllowedUsername(username) && username != Everyone) || !AllowedTopicPattern(topicPattern) {
|
|
return ErrInvalidArgument
|
|
}
|
|
if _, err := a.db.Exec(upsertUserAccessQuery, username, toSQLWildcard(topicPattern), read, write); 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 *SQLiteAuthManager) 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 *SQLiteAuthManager) DefaultAccess() (read bool, write bool) {
|
|
return a.defaultRead, a.defaultWrite
|
|
}
|
|
|
|
func toSQLWildcard(s string) string {
|
|
return strings.ReplaceAll(s, "*", "%")
|
|
}
|
|
|
|
func fromSQLWildcard(s string) string {
|
|
return strings.ReplaceAll(s, "%", "*")
|
|
}
|
|
|
|
func setupAuthDB(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 setupNewAuthDB(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
|
|
}
|
|
return fmt.Errorf("unexpected schema version found: %d", schemaVersion)
|
|
}
|
|
|
|
func setupNewAuthDB(db *sql.DB) error {
|
|
if _, err := db.Exec(createAuthTablesQueries); err != nil {
|
|
return err
|
|
}
|
|
if _, err := db.Exec(insertSchemaVersion, currentSchemaVersion); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|