Basic authentication service. More...

#include <Wt/Auth/AuthService>

Public Member Functions
	AuthService ()
	Constructor.

virtual	~AuthService ()
	Destructor.

void	setRandomTokenLength (int length)
	Sets the token length. More...

int	randomTokenLength () const
	Returns the token length. More...

void	setIdentityPolicy (IdentityPolicy policy)
	Configures the identity policy. More...

IdentityPolicy	identityPolicy () const
	Returns the identity policy. More...

virtual User	identifyUser (const Identity &identity, AbstractUserDatabase &users) const
	Tries to match the identity to an existing user. More...

Authentication token support
void	setAuthTokensEnabled (bool enabled, const std::string &cookieName="wtauth", const std::string &cookieDomain=std::string())
	Configures authentication token support. More...

bool	authTokensEnabled () const
	Returns whether authentication tokens are enabled. More...

std::string	authTokenCookieName () const
	Returns the authentication token cookie name. More...

std::string	authTokenCookieDomain () const
	Returns the authentication token cookie domain. More...

void	setTokenHashFunction (HashFunction *function)
	Sets the token hash function. More...

HashFunction *	tokenHashFunction () const
	Returns the token hash function. More...

std::string	createAuthToken (const User &user) const
	Creates and stores an authentication token for the user. More...

virtual AuthTokenResult	processAuthToken (const std::string &token, AbstractUserDatabase &users) const
	Processes an authentication token. More...

void	setAuthTokenValidity (int minutes)
	Configures the duration for an authenticaton to remain valid. More...

int	authTokenValidity () const
	Returns the authentication token validity. More...

Email verification
void	setEmailVerificationEnabled (bool enabled)
	Configures email verification. More...

bool	emailVerificationEnabled () const
	Returns whether email verification is configured. More...

void	setEmailVerificationRequired (bool enabled)
	Configure email verificiation to be required for login. More...

bool	emailVerificationRequired () const

void	setEmailRedirectInternalPath (const std::string &internalPath)
	Sets the internal path used to present tokens in emails. More...

std::string	emailRedirectInternalPath () const
	Returns the internal path used for email tokens. More...

virtual std::string	parseEmailToken (const std::string &internalPath) const
	Parses the emailtoken from an internal path. More...

virtual void	verifyEmailAddress (const User &user, const std::string &emailAddress) const
	Verifies an email address. More...

virtual void	lostPassword (const std::string &emailAddress, AbstractUserDatabase &users) const
	Implements lost password functionality. More...

virtual EmailTokenResult	processEmailToken (const std::string &token, AbstractUserDatabase &users) const
	Processes an email token. More...

void	setEmailTokenValidity (int minutes)
	Configures the duration for an email token to remain valid. More...

int	emailTokenValidity () const
	Returns the duration for an email token to remain valid. More...

virtual void	sendMail (const Mail::Message &message) const
	Sends an email. More...

Protected Member Functions
virtual void	sendConfirmMail (const std::string &address, const User &user, const std::string &token) const
	Sends a confirmation email to the user to verify his email address. More...

virtual void	sendLostPasswordMail (const std::string &address, const User &user, const std::string &token) const
	Sends an email to the user to enter a new password. More...

Detailed Description

Basic authentication service.

This class presents an basic authentication service, which offers authentication functionality that is not specific to an authentication mechanism (such as password authentication or OAuth authentication).

Like all service classes, this class holds only configuration state. Thus, once configured, it can be safely shared between multiple sessions since its state (the configuration) is read-only. A "const AuthService" object is thus thread-safe.

The class provides the following services (and relevant configuration):

settings for generating random tokens:
- setRandomTokenLength()
authentication tokens, used by e.g. remember-me functionality:
- setAuthTokensEnabled()
- processAuthToken()
email tokens, for email verification and lost password functions:

Member Function Documentation

std::string Wt::Auth::AuthService::authTokenCookieDomain ( ) const

Returns the authentication token cookie domain.

This is the domain used for the authentication cookie. By default this is empty, which means that a cookie will be set for this application.

You may want to set a more general domain if you are sharing the authentication with multiple applications.

See also: setAuthTokensEnabled()

std::string Wt::Auth::AuthService::authTokenCookieName ( ) const

Returns the authentication token cookie name.

This is the default cookie name used for storing the authentication token in the user's browser.

See also: setAuthTokensEnabled()

bool Wt::Auth::AuthService::authTokensEnabled ( ) const

Returns whether authentication tokens are enabled.

See also: setAuthTokensEnabled()

int Wt::Auth::AuthService::authTokenValidity ( ) const

Returns the authentication token validity.

See also: setAuthTokenValidity()

std::string Wt::Auth::AuthService::createAuthToken ( const User & user ) const

Creates and stores an authentication token for the user.

This creates and stores a new authentication token for the given user.

The returned value is the token that may be used to re-identify the user in processAuthToken().

std::string Wt::Auth::AuthService::emailRedirectInternalPath ( ) const

Returns the internal path used for email tokens.

See also: setEmailRedirectInternalPath()

int Wt::Auth::AuthService::emailTokenValidity ( ) const

Returns the duration for an email token to remain valid.

See also: setEmailTokenValidity()

bool Wt::Auth::AuthService::emailVerificationEnabled ( ) const

Returns whether email verification is configured.

See also: setEmailVerificationEnabled()

bool Wt::Auth::AuthService::emailVerificationRequired ( ) const

\ Returns whether email verification is required for login.

See also: setEmailVerificationRequired()

User Wt::Auth::AuthService::identifyUser	(	const Identity &	identity,
		AbstractUserDatabase &	users
	)		const

virtual

Tries to match the identity to an existing user.

When authenticating using a 3rd party Identity Provider, the identity is matched against the existing users, based on the id (with AbstractUserDatabase::findWithIdentity()), or if not matched, based on whether there is a user with the same verified email address as the one indicated by the identity.

IdentityPolicy Wt::Auth::AuthService::identityPolicy ( ) const

Returns the identity policy.

See also: setIdentityPolicy()

void Wt::Auth::AuthService::lostPassword	(	const std::string &	emailAddress,
		AbstractUserDatabase &	users
	)		const

virtual

Implements lost password functionality.

If email address verification is enabled, then a user may recover his password (or rather, chose a new password) using a procedure which involves sending an email to a verified email address.

This method triggers this process, starting from an email address, if this email address corresponds to a verified email address in the database. The current password is not invalidated.

See also: processEmailToken()

std::string Wt::Auth::AuthService::parseEmailToken ( const std::string & internalPath ) const

virtual

Parses the emailtoken from an internal path.

This method parses an internal path and if it matches the email redirection path, it returns the token contained.

It returns an empty string if the internal path does not contain an email token.

AuthTokenResult Wt::Auth::AuthService::processAuthToken	(	const std::string &	token,
		AbstractUserDatabase &	users
	)		const

virtual

Processes an authentication token.

This verifies an authentication token, and considers whether it matches with a token hash value stored in database. If it matches, the token is removed and a new token is created for the identified user.

EmailTokenResult Wt::Auth::AuthService::processEmailToken	(	const std::string &	token,
		AbstractUserDatabase &	users
	)		const

virtual

Processes an email token.

This processes a token received through an email. If successful, the token is removed from the database.

This may return two successful results:

EmailTokenResult::EmailConfirmed: a token was presented which proves that the user is tied to the email address.
EmailTokenResult::UpdatePassword: a token was presented which requires the user to enter a new password.

See also: verifyEmailAddress(); lostPassword()

int Wt::Auth::AuthService::randomTokenLength ( ) const

Returns the token length.

See also: setRandomTokenLength()

void Wt::Auth::AuthService::sendConfirmMail	(	const std::string &	address,
		const User &	user,
		const std::string &	token
	)		const

protectedvirtual

Sends a confirmation email to the user to verify his email address.

Sends a confirmation email to the given address.

The email content is provided by the following string keys:

subject: tr("Wt.auth.verification-mail.subject")
body: tr("Wt.auth.verification-mail.body") with {1} a place holder for the identity, and {2} a placeholder for the redirection URL.
HTML body: tr("Wt.auth.verification-mail.htmlbody") with the same place holders.

void Wt::Auth::AuthService::sendLostPasswordMail	(	const std::string &	address,
		const User &	user,
		const std::string &	token
	)		const

protectedvirtual

Sends an email to the user to enter a new password.

This sends a lost password email to the given address, with a given token.

The default implementation will call sendMail() with the following message:

tr("Wt.Auth.lost-password-mail.subject") as subject,
tr("Wt.Auth.lost-password-mail.body") as body to which it passes user.identity() and token as arguments.
tr("Wt.Auth.lost-password-mail.htmlbody") as HTML body to which it passes user.identity() and token as arguments.

void Wt::Auth::AuthService::sendMail ( const Mail::Message & message ) const

virtual

Sends an email.

Sends an email to the given address with subject and body.

The default implementation will consult configuration properties to add a sender address if it hasn't already been set:

"auth-mail-sender-name": the sender name, with default value "Wt Auth module"
"auth-mail-sender-address": the sender email address, with default value "noreply-auth@www.webtoolkit.eu"

Then it uses Mail::Client to send the message, using default the default client settings.

void Wt::Auth::AuthService::setAuthTokensEnabled	(	bool	enabled,
		const std::string &	cookieName = `"wtauth"`,
		const std::string &	cookieDomain = `std::string()`
	)

Configures authentication token support.

This method allows you to configure whether authentication tokens are in use. Authentication tokens are used for the user to bypass a more elaborate authentication method, and are a secret shared with the user's user agent, usually in a cookie. They are typically presented in the user interfaces as a "remember me" option.

Whenever a valid authentication token is presented in processToken(), it is invalidated a new token is generated and stored for the user.

The tokens are generated and subsequently hashed using the token hash function. Only the hash values are stored in the user database so that a compromised user database does not compromise these tokens.

Authentication tokens are disabled by default.

See also: setTokenHashFunction(), setAuthTokenValidity()

void Wt::Auth::AuthService::setAuthTokenValidity ( int minutes )

Configures the duration for an authenticaton to remain valid.

The default duration is two weeks (14 * 24 * 60 minutes).

void Wt::Auth::AuthService::setEmailRedirectInternalPath ( const std::string & internalPath )

Sets the internal path used to present tokens in emails.

The default path is "/auth/mail/".

void Wt::Auth::AuthService::setEmailTokenValidity ( int minutes )

Configures the duration for an email token to remain valid.

The default duration is three days (3 * 24 * 60 minutes). Three is a divine number.

void Wt::Auth::AuthService::setEmailVerificationEnabled ( bool enabled )

Configures email verification.

Email verification is useful for a user to recover a lost password, or to be able to confidently confirm other events with this user (such as order processing).

void Wt::Auth::AuthService::setEmailVerificationRequired ( bool enabled )

Configure email verificiation to be required for login.

When enabled, a user will not be able to login if the email-address was not verified.

void Wt::Auth::AuthService::setIdentityPolicy ( IdentityPolicy policy )

Configures the identity policy.

The identity policy has an impact on the login and registration procedure.

void Wt::Auth::AuthService::setRandomTokenLength ( int length )

Sets the token length.

Configures the length used for random tokens. Random tokens are generated for authentication tokens, and email tokens.

The default length is 32 characters.

See also: WRandom::generateId()

void Wt::Auth::AuthService::setTokenHashFunction ( HashFunction * function )

Sets the token hash function.

Sets the hash function used to safely store authentication tokens in the database. Ownership of the hash function is transferred.

The default token hash function is an MD5HashFunction.

HashFunction * Wt::Auth::AuthService::tokenHashFunction ( ) const

Returns the token hash function.

See also: setTokenHashFunction()

void Wt::Auth::AuthService::verifyEmailAddress	(	const User &	user,
		const std::string &	emailAddress
	)		const

virtual

Verifies an email address.

This registers a new email token with the user.

Then it sends an email to the user's unverified email address with instructions that redirect him to this site, using sendConfirmEmail().

See also: processEmailToken()

Public Member Functions

Protected Member Functions

Detailed Description

Member Function Documentation