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This commit is contained in:
Philipp Heckel 2022-01-25 22:30:53 -05:00
parent 26dde0f286
commit 89957e7058
3 changed files with 74 additions and 12 deletions
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2
Makefile
View file

@ -80,7 +80,7 @@ vet:
go vet ./...
lint:
which golint || go get -u golang.org/x/lint/golint
which golint || go install golang.org/x/lint/golint@latest
go list ./... | grep -v /vendor/ | xargs -L1 golint -set_exit_status
staticcheck: .PHONY

43
auth/auth.go
View file

@ -4,22 +4,53 @@ import "errors"
// Auther is a generic interface to implement password-based authentication and authorization
type Auther interface {
Authenticate(user, pass string) (*User, error)
// 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.
Authenticate(username, password string) (*User, error)
// 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.
Authorize(user *User, topic string, perm Permission) error
}
// Manager is an interface representing user and access management
type Manager interface {
// AddUser adds a user with the given username, password and role. The password should be hashed
// before it is stored in a persistence layer.
AddUser(username, password string, role Role) error
// 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.
RemoveUser(username string) error
// Users returns a list of users. It always also returns the Everyone user ("*").
Users() ([]*User, error)
// 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.
User(username string) (*User, error)
// ChangePassword changes a user's password
ChangePassword(username, password string) error
// 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.
ChangeRole(username string, role Role) error
DefaultAccess() (read bool, write bool)
// AllowAccess adds or updates an entry in th access control list for a specific user. It controls
// read/write access to a topic.
AllowAccess(username string, topic string, read bool, write bool) error
// ResetAccess removes an access control list entry for a specific username/topic, or (if topic is
// empty) for an entire user.
ResetAccess(username string, topic string) error
// DefaultAccess returns the default read/write access if no access control entry matches
DefaultAccess() (read bool, write bool)
}
// User is a struct that represents a user
type User struct {
Name string
Hash string // password hash (bcrypt)
@ -27,35 +58,43 @@ type User struct {
Grants []Grant
}
// Grant is a struct that represents an access control entry to a topic
type Grant struct {
Topic string
Read bool
Write bool
}
// Permission represents a read or write permission to a topic
type Permission int
// Permissions to a topic
const (
PermissionRead = Permission(1)
PermissionWrite = Permission(2)
)
// Role represents a user's role, either admin or regular user
type Role string
// User roles
const (
RoleAdmin = Role("admin")
RoleUser = Role("user")
RoleAnonymous = Role("anonymous")
)
// Everyone is a special username representing anonymous users
const (
Everyone = "*"
)
// AllowedRole returns true if the given role can be used for new users
func AllowedRole(role Role) bool {
return role == RoleUser || role == RoleAdmin
}
// Error constants used by the package
var (
ErrUnauthenticated = errors.New("unauthenticated")
ErrUnauthorized = errors.New("unauthorized")

41
auth/auth_sqlite.go
View file

@ -61,6 +61,8 @@ const (
deleteTopicAccessQuery = `DELETE FROM access WHERE user = ? AND topic = ?`
)
// SQLiteAuth is an implementation of Auther and Manager. It stores users and access control list
// in a SQLite database.
type SQLiteAuth struct {
db *sql.DB
defaultRead bool
@ -74,6 +76,7 @@ var (
var _ Auther = (*SQLiteAuth)(nil)
var _ Manager = (*SQLiteAuth)(nil)
// NewSQLiteAuth creates a new SQLiteAuth instance
func NewSQLiteAuth(filename string, defaultRead, defaultWrite bool) (*SQLiteAuth, error) {
db, err := sql.Open("sqlite3", filename)
if err != nil {
@ -97,6 +100,9 @@ func setupNewAuthDB(db *sql.DB) error {
return 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 *SQLiteAuth) Authenticate(username, password string) (*User, error) {
if username == Everyone {
return nil, ErrUnauthenticated
@ -113,17 +119,19 @@ func (a *SQLiteAuth) Authenticate(username, password string) (*User, error) {
return user, 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 *SQLiteAuth) Authorize(user *User, topic string, perm Permission) error {
if user != nil && user.Role == RoleAdmin {
return nil // Admin can do everything
}
// 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).
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
@ -150,8 +158,10 @@ func (a *SQLiteAuth) resolvePerms(read, write bool, perm Permission) error {
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 *SQLiteAuth) AddUser(username, password string, role Role) error {
if !allowedUsernameRegex.MatchString(username) || (role != RoleAdmin && role != RoleUser) {
if !allowedUsernameRegex.MatchString(username) || !AllowedRole(role) {
return ErrInvalidArgument
}
hash, err := bcrypt.GenerateFromPassword([]byte(password), bcryptCost)
@ -164,6 +174,8 @@ func (a *SQLiteAuth) AddUser(username, password string, role Role) error {
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 *SQLiteAuth) RemoveUser(username string) error {
if !allowedUsernameRegex.MatchString(username) || username == Everyone {
return ErrInvalidArgument
@ -177,6 +189,7 @@ func (a *SQLiteAuth) RemoveUser(username string) error {
return nil
}
// Users returns a list of users. It always also returns the Everyone user ("*").
func (a *SQLiteAuth) Users() ([]*User, error) {
rows, err := a.db.Query(selectUsernamesQuery)
if err != nil {
@ -210,6 +223,8 @@ func (a *SQLiteAuth) Users() ([]*User, error) {
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 *SQLiteAuth) User(username string) (*User, error) {
if username == Everyone {
return a.everyoneUser()
@ -277,6 +292,7 @@ func (a *SQLiteAuth) readGrants(username string) ([]Grant, error) {
return grants, nil
}
// ChangePassword changes a user's password
func (a *SQLiteAuth) ChangePassword(username, password string) error {
hash, err := bcrypt.GenerateFromPassword([]byte(password), bcryptCost)
if err != nil {
@ -288,8 +304,10 @@ func (a *SQLiteAuth) ChangePassword(username, password string) error {
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 *SQLiteAuth) ChangeRole(username string, role Role) error {
if !allowedUsernameRegex.MatchString(username) || (role != RoleAdmin && role != RoleUser) {
if !allowedUsernameRegex.MatchString(username) || !AllowedRole(role) {
return ErrInvalidArgument
}
if _, err := a.db.Exec(updateUserRoleQuery, string(role), username); err != nil {
@ -303,10 +321,8 @@ func (a *SQLiteAuth) ChangeRole(username string, role Role) error {
return nil
}
func (a *SQLiteAuth) DefaultAccess() (read bool, write bool) {
return a.defaultRead, a.defaultWrite
}
// AllowAccess adds or updates an entry in th access control list for a specific user. It controls
// read/write access to a topic.
func (a *SQLiteAuth) AllowAccess(username string, topic string, read bool, write bool) error {
if _, err := a.db.Exec(upsertUserAccessQuery, username, topic, read, write); err != nil {
return err
@ -314,6 +330,8 @@ func (a *SQLiteAuth) AllowAccess(username string, topic string, read bool, write
return nil
}
// ResetAccess removes an access control list entry for a specific username/topic, or (if topic is
// empty) for an entire user.
func (a *SQLiteAuth) ResetAccess(username string, topic string) error {
if username == "" && topic == "" {
_, err := a.db.Exec(deleteAllAccessQuery, username)
@ -325,3 +343,8 @@ func (a *SQLiteAuth) ResetAccess(username string, topic string) error {
_, err := a.db.Exec(deleteTopicAccessQuery, username, topic)
return err
}
// DefaultAccess returns the default read/write access if no access control entry matches
func (a *SQLiteAuth) DefaultAccess() (read bool, write bool) {
return a.defaultRead, a.defaultWrite
}