gnome-shell/js/gdm/util.js

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// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
const Clutter = imports.gi.Clutter;
const Gio = imports.gi.Gio;
const GLib = imports.gi.GLib;
const Lang = imports.lang;
const Mainloop = imports.mainloop;
const Signals = imports.signals;
const St = imports.gi.St;
const Batch = imports.gdm.batch;
const Fprint = imports.gdm.fingerprint;
gdm: support pre-authenticated logins from oVirt oVirt is software for managing medium-to-large scale deployments of virtual machine guests across multiple hosts. It supports a feature where users can authenticate with a central server and get transparently connected to a guest system and then automatically get logged into that guest to an associated user session. Guests using old versions of GDM support this single-sign-on capability by means of a greeter plugin, using the old greeter's extension API. This commit adds similar support to the gnome-shell based login screen. How it works: * The OVirtCredentialsManager singleton listens for 'org.ovirt.vdsm.Credentials.UserAuthenticated' D-Bus signal on the system bus from the 'org.ovirt.vdsm.Credentials' bus name. The service that provides that bus name is called the oVirt guest agent. It is also responsible for interacting with the the central server to get user credentials. * This UserAuthenticated signal passes, as a parameter, the a token which needs to be passed through to the PAM service that is specifically set up to integrate with the oVirt authentication architecture. The singleton object keeps the token internally so it can be queried later on. * The OVirtCredentialsManager emits a signal 'user-authenticated' on it's object once the dbus signal is triggered * When the 'user-authenticated' signal is emitted, the login screen tells GDM to start user verification using the PAM service. The authentication stack of the service includes a PAM module provided by oVirt that securely retrieves user credentials from the oVirt guest agent. The PAM module then forwards those credentials on to other modules in the stack so, e.g., the user's gnome keyring can be automatically unlocked. * In case of the screen shield being visible, it also will react on that 'user-authenticated' signal and lift the shield. In that case the login screen will check on construction time if the signal has already been triggered, and a token is available. If a token is available it will immediately trigger the functionality as described above. Signed-off-by: Vinzenz Feenstra <evilissimo@redhat.com> https://bugzilla.gnome.org/show_bug.cgi?id=702162
2013-10-10 04:21:47 -04:00
const OVirt = imports.gdm.oVirt;
const Main = imports.ui.main;
const Params = imports.misc.params;
const ShellEntry = imports.ui.shellEntry;
const SmartcardManager = imports.misc.smartcardManager;
const Tweener = imports.ui.tweener;
const PASSWORD_SERVICE_NAME = 'gdm-password';
const FINGERPRINT_SERVICE_NAME = 'gdm-fingerprint';
const SMARTCARD_SERVICE_NAME = 'gdm-smartcard';
gdm: support pre-authenticated logins from oVirt oVirt is software for managing medium-to-large scale deployments of virtual machine guests across multiple hosts. It supports a feature where users can authenticate with a central server and get transparently connected to a guest system and then automatically get logged into that guest to an associated user session. Guests using old versions of GDM support this single-sign-on capability by means of a greeter plugin, using the old greeter's extension API. This commit adds similar support to the gnome-shell based login screen. How it works: * The OVirtCredentialsManager singleton listens for 'org.ovirt.vdsm.Credentials.UserAuthenticated' D-Bus signal on the system bus from the 'org.ovirt.vdsm.Credentials' bus name. The service that provides that bus name is called the oVirt guest agent. It is also responsible for interacting with the the central server to get user credentials. * This UserAuthenticated signal passes, as a parameter, the a token which needs to be passed through to the PAM service that is specifically set up to integrate with the oVirt authentication architecture. The singleton object keeps the token internally so it can be queried later on. * The OVirtCredentialsManager emits a signal 'user-authenticated' on it's object once the dbus signal is triggered * When the 'user-authenticated' signal is emitted, the login screen tells GDM to start user verification using the PAM service. The authentication stack of the service includes a PAM module provided by oVirt that securely retrieves user credentials from the oVirt guest agent. The PAM module then forwards those credentials on to other modules in the stack so, e.g., the user's gnome keyring can be automatically unlocked. * In case of the screen shield being visible, it also will react on that 'user-authenticated' signal and lift the shield. In that case the login screen will check on construction time if the signal has already been triggered, and a token is available. If a token is available it will immediately trigger the functionality as described above. Signed-off-by: Vinzenz Feenstra <evilissimo@redhat.com> https://bugzilla.gnome.org/show_bug.cgi?id=702162
2013-10-10 04:21:47 -04:00
const OVIRT_SERVICE_NAME = 'gdm-ovirtcred';
const FADE_ANIMATION_TIME = 0.16;
const CLONE_FADE_ANIMATION_TIME = 0.25;
const LOGIN_SCREEN_SCHEMA = 'org.gnome.login-screen';
const PASSWORD_AUTHENTICATION_KEY = 'enable-password-authentication';
const FINGERPRINT_AUTHENTICATION_KEY = 'enable-fingerprint-authentication';
const SMARTCARD_AUTHENTICATION_KEY = 'enable-smartcard-authentication';
const BANNER_MESSAGE_KEY = 'banner-message-enable';
const BANNER_MESSAGE_TEXT_KEY = 'banner-message-text';
const ALLOWED_FAILURES_KEY = 'allowed-failures';
const LOGO_KEY = 'logo';
const DISABLE_USER_LIST_KEY = 'disable-user-list';
// Give user 48ms to read each character of a PAM message
const USER_READ_TIME = 48
const MessageType = {
NONE: 0,
ERROR: 1,
INFO: 2,
HINT: 3
};
function fadeInActor(actor) {
if (actor.opacity == 255 && actor.visible)
return null;
let hold = new Batch.Hold();
actor.show();
let [minHeight, naturalHeight] = actor.get_preferred_height(-1);
actor.opacity = 0;
actor.set_height(0);
Tweener.addTween(actor,
{ opacity: 255,
height: naturalHeight,
time: FADE_ANIMATION_TIME,
transition: 'easeOutQuad',
onComplete: function() {
this.set_height(-1);
hold.release();
},
});
return hold;
}
function fadeOutActor(actor) {
if (!actor.visible || actor.opacity == 0) {
actor.opacity = 0;
actor.hide();
return null;
}
let hold = new Batch.Hold();
Tweener.addTween(actor,
{ opacity: 0,
height: 0,
time: FADE_ANIMATION_TIME,
transition: 'easeOutQuad',
onComplete: function() {
this.hide();
this.set_height(-1);
hold.release();
},
});
return hold;
}
function cloneAndFadeOutActor(actor) {
// Immediately hide actor so its sibling can have its space
// and position, but leave a non-reactive clone on-screen,
// so from the user's point of view it smoothly fades away
// and reveals its sibling.
actor.hide();
let clone = new Clutter.Clone({ source: actor,
reactive: false });
Main.uiGroup.add_child(clone);
let [x, y] = actor.get_transformed_position();
clone.set_position(x, y);
let hold = new Batch.Hold();
Tweener.addTween(clone,
{ opacity: 0,
time: CLONE_FADE_ANIMATION_TIME,
transition: 'easeOutQuad',
onComplete: function() {
clone.destroy();
hold.release();
}
});
return hold;
}
const ShellUserVerifier = new Lang.Class({
Name: 'ShellUserVerifier',
_init: function(client, params) {
params = Params.parse(params, { reauthenticationOnly: false });
this._reauthOnly = params.reauthenticationOnly;
this._client = client;
this._settings = new Gio.Settings({ schema_id: LOGIN_SCREEN_SCHEMA });
this._settings.connect('changed',
Lang.bind(this, this._updateDefaultService));
this._updateDefaultService();
this._fprintManager = new Fprint.FprintManager();
this._smartcardManager = SmartcardManager.getSmartcardManager();
// We check for smartcards right away, since an inserted smartcard
// at startup should result in immediately initiating authentication.
// This is different than fingeprint readers, where we only check them
// after a user has been picked.
this._checkForSmartcard();
this._smartcardInsertedId = this._smartcardManager.connect('smartcard-inserted',
Lang.bind(this, this._checkForSmartcard));
this._smartcardRemovedId = this._smartcardManager.connect('smartcard-removed',
Lang.bind(this, this._checkForSmartcard));
this._messageQueue = [];
this._messageQueueTimeoutId = 0;
this.hasPendingMessages = false;
this.reauthenticating = false;
this._failCounter = 0;
gdm: support pre-authenticated logins from oVirt oVirt is software for managing medium-to-large scale deployments of virtual machine guests across multiple hosts. It supports a feature where users can authenticate with a central server and get transparently connected to a guest system and then automatically get logged into that guest to an associated user session. Guests using old versions of GDM support this single-sign-on capability by means of a greeter plugin, using the old greeter's extension API. This commit adds similar support to the gnome-shell based login screen. How it works: * The OVirtCredentialsManager singleton listens for 'org.ovirt.vdsm.Credentials.UserAuthenticated' D-Bus signal on the system bus from the 'org.ovirt.vdsm.Credentials' bus name. The service that provides that bus name is called the oVirt guest agent. It is also responsible for interacting with the the central server to get user credentials. * This UserAuthenticated signal passes, as a parameter, the a token which needs to be passed through to the PAM service that is specifically set up to integrate with the oVirt authentication architecture. The singleton object keeps the token internally so it can be queried later on. * The OVirtCredentialsManager emits a signal 'user-authenticated' on it's object once the dbus signal is triggered * When the 'user-authenticated' signal is emitted, the login screen tells GDM to start user verification using the PAM service. The authentication stack of the service includes a PAM module provided by oVirt that securely retrieves user credentials from the oVirt guest agent. The PAM module then forwards those credentials on to other modules in the stack so, e.g., the user's gnome keyring can be automatically unlocked. * In case of the screen shield being visible, it also will react on that 'user-authenticated' signal and lift the shield. In that case the login screen will check on construction time if the signal has already been triggered, and a token is available. If a token is available it will immediately trigger the functionality as described above. Signed-off-by: Vinzenz Feenstra <evilissimo@redhat.com> https://bugzilla.gnome.org/show_bug.cgi?id=702162
2013-10-10 04:21:47 -04:00
this._oVirtCredentialsManager = OVirt.getOVirtCredentialsManager();
if (this._oVirtCredentialsManager.hasToken())
this._oVirtUserAuthenticated(this._oVirtCredentialsManager.getToken());
this._oVirtUserAuthenticatedId = this._oVirtCredentialsManager.connect('user-authenticated',
Lang.bind(this, this._oVirtUserAuthenticated));
},
begin: function(userName, hold) {
this._cancellable = new Gio.Cancellable();
this._hold = hold;
this._userName = userName;
this.reauthenticating = false;
this._checkForFingerprintReader();
if (userName) {
// If possible, reauthenticate an already running session,
// so any session specific credentials get updated appropriately
this._client.open_reauthentication_channel(userName, this._cancellable,
Lang.bind(this, this._reauthenticationChannelOpened));
} else {
this._client.get_user_verifier(this._cancellable, Lang.bind(this, this._userVerifierGot));
}
},
cancel: function() {
if (this._cancellable)
this._cancellable.cancel();
if (this._userVerifier) {
this._userVerifier.call_cancel_sync(null);
this.clear();
}
},
_clearUserVerifier: function() {
if (this._userVerifier) {
this._userVerifier.run_dispose();
this._userVerifier = null;
}
},
clear: function() {
if (this._cancellable) {
this._cancellable.cancel();
this._cancellable = null;
}
this._clearUserVerifier();
this._clearMessageQueue();
},
destroy: function() {
this.clear();
this._settings.run_dispose();
this._settings = null;
this._smartcardManager.disconnect(this._smartcardInsertedId);
this._smartcardManager.disconnect(this._smartcardRemovedId);
this._smartcardManager = null;
this._oVirtCredentialsManager.disconnect(this._oVirtUserAuthenticatedId);
this._oVirtCredentialsManager = null;
},
answerQuery: function(serviceName, answer) {
if (!this.hasPendingMessages) {
this._userVerifier.call_answer_query(serviceName, answer, this._cancellable, null);
} else {
let signalId = this.connect('no-more-messages',
Lang.bind(this, function() {
this.disconnect(signalId);
this._userVerifier.call_answer_query(serviceName, answer, this._cancellable, null);
}));
}
},
_getIntervalForMessage: function(message) {
// We probably could be smarter here
return message.length * USER_READ_TIME;
},
finishMessageQueue: function() {
if (!this.hasPendingMessages)
return;
this._messageQueue = [];
this.hasPendingMessages = false;
this.emit('no-more-messages');
},
_queueMessageTimeout: function() {
if (this._messageQueue.length == 0) {
this.finishMessageQueue();
return;
}
if (this._messageQueueTimeoutId != 0)
return;
let message = this._messageQueue.shift();
this.emit('show-message', message.text, message.type);
this._messageQueueTimeoutId = GLib.timeout_add(GLib.PRIORITY_DEFAULT,
message.interval,
Lang.bind(this, function() {
this._messageQueueTimeoutId = 0;
this._queueMessageTimeout();
return GLib.SOURCE_REMOVE;
}));
GLib.Source.set_name_by_id(this._messageQueueTimeoutId, '[gnome-shell] this._queueMessageTimeout');
},
_queueMessage: function(message, messageType) {
let interval = this._getIntervalForMessage(message);
this.hasPendingMessages = true;
this._messageQueue.push({ text: message, type: messageType, interval: interval });
this._queueMessageTimeout();
},
_clearMessageQueue: function() {
this.finishMessageQueue();
if (this._messageQueueTimeoutId != 0) {
GLib.source_remove(this._messageQueueTimeoutId);
this._messageQueueTimeoutId = 0;
}
this.emit('show-message', null, MessageType.NONE);
},
_checkForFingerprintReader: function() {
this._haveFingerprintReader = false;
if (!this._settings.get_boolean(FINGERPRINT_AUTHENTICATION_KEY)) {
this._updateDefaultService();
return;
}
this._fprintManager.GetDefaultDeviceRemote(Gio.DBusCallFlags.NONE, this._cancellable, Lang.bind(this,
function(device, error) {
if (!error && device) {
this._haveFingerprintReader = true;
this._updateDefaultService();
}
}));
},
gdm: support pre-authenticated logins from oVirt oVirt is software for managing medium-to-large scale deployments of virtual machine guests across multiple hosts. It supports a feature where users can authenticate with a central server and get transparently connected to a guest system and then automatically get logged into that guest to an associated user session. Guests using old versions of GDM support this single-sign-on capability by means of a greeter plugin, using the old greeter's extension API. This commit adds similar support to the gnome-shell based login screen. How it works: * The OVirtCredentialsManager singleton listens for 'org.ovirt.vdsm.Credentials.UserAuthenticated' D-Bus signal on the system bus from the 'org.ovirt.vdsm.Credentials' bus name. The service that provides that bus name is called the oVirt guest agent. It is also responsible for interacting with the the central server to get user credentials. * This UserAuthenticated signal passes, as a parameter, the a token which needs to be passed through to the PAM service that is specifically set up to integrate with the oVirt authentication architecture. The singleton object keeps the token internally so it can be queried later on. * The OVirtCredentialsManager emits a signal 'user-authenticated' on it's object once the dbus signal is triggered * When the 'user-authenticated' signal is emitted, the login screen tells GDM to start user verification using the PAM service. The authentication stack of the service includes a PAM module provided by oVirt that securely retrieves user credentials from the oVirt guest agent. The PAM module then forwards those credentials on to other modules in the stack so, e.g., the user's gnome keyring can be automatically unlocked. * In case of the screen shield being visible, it also will react on that 'user-authenticated' signal and lift the shield. In that case the login screen will check on construction time if the signal has already been triggered, and a token is available. If a token is available it will immediately trigger the functionality as described above. Signed-off-by: Vinzenz Feenstra <evilissimo@redhat.com> https://bugzilla.gnome.org/show_bug.cgi?id=702162
2013-10-10 04:21:47 -04:00
_oVirtUserAuthenticated: function(token) {
this._preemptingService = OVIRT_SERVICE_NAME;
this.emit('ovirt-user-authenticated');
},
_checkForSmartcard: function() {
let smartcardDetected;
if (!this._settings.get_boolean(SMARTCARD_AUTHENTICATION_KEY))
smartcardDetected = false;
else if (this._reauthOnly)
smartcardDetected = this._smartcardManager.hasInsertedLoginToken();
else
smartcardDetected = this._smartcardManager.hasInsertedTokens();
if (smartcardDetected != this.smartcardDetected) {
this.smartcardDetected = smartcardDetected;
if (this.smartcardDetected)
this._preemptingService = SMARTCARD_SERVICE_NAME;
else if (this._preemptingService == SMARTCARD_SERVICE_NAME)
this._preemptingService = null;
this.emit('smartcard-status-changed');
}
},
_reportInitError: function(where, error) {
logError(error, where);
this._hold.release();
this._queueMessage(_("Authentication error"), MessageType.ERROR);
this._verificationFailed(false);
},
_reauthenticationChannelOpened: function(client, result) {
try {
this._clearUserVerifier();
this._userVerifier = client.open_reauthentication_channel_finish(result);
} catch(e if e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.CANCELLED)) {
return;
} catch(e if e.matches(Gio.DBusError, Gio.DBusError.ACCESS_DENIED) &&
!this._reauthOnly) {
// Gdm emits org.freedesktop.DBus.Error.AccessDenied when there is
// no session to reauthenticate. Fall back to performing verification
// from this login session
client.get_user_verifier(this._cancellable, Lang.bind(this, this._userVerifierGot));
return;
} catch(e) {
this._reportInitError('Failed to open reauthentication channel', e);
return;
}
this.reauthenticating = true;
this._connectSignals();
this._beginVerification();
this._hold.release();
},
_userVerifierGot: function(client, result) {
try {
this._clearUserVerifier();
this._userVerifier = client.get_user_verifier_finish(result);
} catch(e if e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.CANCELLED)) {
return;
} catch(e) {
this._reportInitError('Failed to obtain user verifier', e);
return;
}
this._connectSignals();
this._beginVerification();
this._hold.release();
},
_connectSignals: function() {
this._userVerifier.connect('info', Lang.bind(this, this._onInfo));
this._userVerifier.connect('problem', Lang.bind(this, this._onProblem));
this._userVerifier.connect('info-query', Lang.bind(this, this._onInfoQuery));
this._userVerifier.connect('secret-info-query', Lang.bind(this, this._onSecretInfoQuery));
this._userVerifier.connect('conversation-stopped', Lang.bind(this, this._onConversationStopped));
this._userVerifier.connect('reset', Lang.bind(this, this._onReset));
this._userVerifier.connect('verification-complete', Lang.bind(this, this._onVerificationComplete));
},
_getForegroundService: function() {
if (this._preemptingService)
return this._preemptingService;
return this._defaultService;
},
serviceIsForeground: function(serviceName) {
return serviceName == this._getForegroundService();
},
serviceIsDefault: function(serviceName) {
return serviceName == this._defaultService;
},
_updateDefaultService: function() {
if (this._settings.get_boolean(PASSWORD_AUTHENTICATION_KEY))
this._defaultService = PASSWORD_SERVICE_NAME;
else if (this._settings.get_boolean(SMARTCARD_AUTHENTICATION_KEY))
this._defaultService = SMARTCARD_SERVICE_NAME;
else if (this._haveFingerprintReader)
this._defaultService = FINGERPRINT_SERVICE_NAME;
},
_startService: function(serviceName) {
this._hold.acquire();
if (this._userName) {
this._userVerifier.call_begin_verification_for_user(serviceName,
this._userName,
this._cancellable,
Lang.bind(this, function(obj, result) {
try {
obj.call_begin_verification_for_user_finish(result);
} catch(e if e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.CANCELLED)) {
return;
} catch(e) {
this._reportInitError('Failed to start verification for user', e);
return;
}
this._hold.release();
}));
} else {
this._userVerifier.call_begin_verification(serviceName,
this._cancellable,
Lang.bind(this, function(obj, result) {
try {
obj.call_begin_verification_finish(result);
} catch(e if e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.CANCELLED)) {
return;
} catch(e) {
this._reportInitError('Failed to start verification', e);
return;
}
this._hold.release();
}));
}
},
_beginVerification: function() {
this._startService(this._getForegroundService());
if (this._userName && this._haveFingerprintReader && !this.serviceIsForeground(FINGERPRINT_SERVICE_NAME))
this._startService(FINGERPRINT_SERVICE_NAME);
},
_onInfo: function(client, serviceName, info) {
if (this.serviceIsForeground(serviceName)) {
this._queueMessage(info, MessageType.INFO);
} else if (serviceName == FINGERPRINT_SERVICE_NAME &&
this._haveFingerprintReader) {
// We don't show fingerprint messages directly since it's
// not the main auth service. Instead we use the messages
// as a cue to display our own message.
// Translators: this message is shown below the password entry field
// to indicate the user can swipe their finger instead
this._queueMessage(_("(or swipe finger)"), MessageType.HINT);
}
},
_onProblem: function(client, serviceName, problem) {
if (!this.serviceIsForeground(serviceName))
return;
this._queueMessage(problem, MessageType.ERROR);
},
_onInfoQuery: function(client, serviceName, question) {
if (!this.serviceIsForeground(serviceName))
return;
this.emit('ask-question', serviceName, question, '');
},
_onSecretInfoQuery: function(client, serviceName, secretQuestion) {
if (!this.serviceIsForeground(serviceName))
return;
gdm: support pre-authenticated logins from oVirt oVirt is software for managing medium-to-large scale deployments of virtual machine guests across multiple hosts. It supports a feature where users can authenticate with a central server and get transparently connected to a guest system and then automatically get logged into that guest to an associated user session. Guests using old versions of GDM support this single-sign-on capability by means of a greeter plugin, using the old greeter's extension API. This commit adds similar support to the gnome-shell based login screen. How it works: * The OVirtCredentialsManager singleton listens for 'org.ovirt.vdsm.Credentials.UserAuthenticated' D-Bus signal on the system bus from the 'org.ovirt.vdsm.Credentials' bus name. The service that provides that bus name is called the oVirt guest agent. It is also responsible for interacting with the the central server to get user credentials. * This UserAuthenticated signal passes, as a parameter, the a token which needs to be passed through to the PAM service that is specifically set up to integrate with the oVirt authentication architecture. The singleton object keeps the token internally so it can be queried later on. * The OVirtCredentialsManager emits a signal 'user-authenticated' on it's object once the dbus signal is triggered * When the 'user-authenticated' signal is emitted, the login screen tells GDM to start user verification using the PAM service. The authentication stack of the service includes a PAM module provided by oVirt that securely retrieves user credentials from the oVirt guest agent. The PAM module then forwards those credentials on to other modules in the stack so, e.g., the user's gnome keyring can be automatically unlocked. * In case of the screen shield being visible, it also will react on that 'user-authenticated' signal and lift the shield. In that case the login screen will check on construction time if the signal has already been triggered, and a token is available. If a token is available it will immediately trigger the functionality as described above. Signed-off-by: Vinzenz Feenstra <evilissimo@redhat.com> https://bugzilla.gnome.org/show_bug.cgi?id=702162
2013-10-10 04:21:47 -04:00
if (serviceName == OVIRT_SERVICE_NAME) {
// The only question asked by this service is "Token?"
this.answerQuery(serviceName, this._oVirtCredentialsManager.getToken());
return;
}
this.emit('ask-question', serviceName, secretQuestion, '\u25cf');
},
_onReset: function() {
// Clear previous attempts to authenticate
this._failCounter = 0;
this._updateDefaultService();
this.emit('reset');
},
_onVerificationComplete: function() {
this.emit('verification-complete');
},
_cancelAndReset: function() {
this.cancel();
this._onReset();
},
_retry: function() {
this.begin(this._userName, new Batch.Hold());
},
_verificationFailed: function(retry) {
// For Not Listed / enterprise logins, immediately reset
// the dialog
// Otherwise, we allow ALLOWED_FAILURES attempts. After that, we
// go back to the welcome screen.
this._failCounter++;
let canRetry = retry && this._userName &&
this._failCounter < this._settings.get_int(ALLOWED_FAILURES_KEY);
if (canRetry) {
if (!this.hasPendingMessages) {
this._retry();
} else {
let signalId = this.connect('no-more-messages',
Lang.bind(this, function() {
this.disconnect(signalId);
this._retry();
}));
}
} else {
if (!this.hasPendingMessages) {
this._cancelAndReset();
} else {
let signalId = this.connect('no-more-messages',
Lang.bind(this, function() {
this.disconnect(signalId);
this._cancelAndReset();
}));
}
}
this.emit('verification-failed');
},
_onConversationStopped: function(client, serviceName) {
gdm: support pre-authenticated logins from oVirt oVirt is software for managing medium-to-large scale deployments of virtual machine guests across multiple hosts. It supports a feature where users can authenticate with a central server and get transparently connected to a guest system and then automatically get logged into that guest to an associated user session. Guests using old versions of GDM support this single-sign-on capability by means of a greeter plugin, using the old greeter's extension API. This commit adds similar support to the gnome-shell based login screen. How it works: * The OVirtCredentialsManager singleton listens for 'org.ovirt.vdsm.Credentials.UserAuthenticated' D-Bus signal on the system bus from the 'org.ovirt.vdsm.Credentials' bus name. The service that provides that bus name is called the oVirt guest agent. It is also responsible for interacting with the the central server to get user credentials. * This UserAuthenticated signal passes, as a parameter, the a token which needs to be passed through to the PAM service that is specifically set up to integrate with the oVirt authentication architecture. The singleton object keeps the token internally so it can be queried later on. * The OVirtCredentialsManager emits a signal 'user-authenticated' on it's object once the dbus signal is triggered * When the 'user-authenticated' signal is emitted, the login screen tells GDM to start user verification using the PAM service. The authentication stack of the service includes a PAM module provided by oVirt that securely retrieves user credentials from the oVirt guest agent. The PAM module then forwards those credentials on to other modules in the stack so, e.g., the user's gnome keyring can be automatically unlocked. * In case of the screen shield being visible, it also will react on that 'user-authenticated' signal and lift the shield. In that case the login screen will check on construction time if the signal has already been triggered, and a token is available. If a token is available it will immediately trigger the functionality as described above. Signed-off-by: Vinzenz Feenstra <evilissimo@redhat.com> https://bugzilla.gnome.org/show_bug.cgi?id=702162
2013-10-10 04:21:47 -04:00
// If the login failed with the preauthenticated oVirt credentials
// then discard the credentials and revert to default authentication
// mechanism.
if (this.serviceIsForeground(OVIRT_SERVICE_NAME)) {
this._oVirtCredentialsManager.resetToken();
this._preemptingService = null;
this._verificationFailed(false);
return;
}
// if the password service fails, then cancel everything.
// But if, e.g., fingerprint fails, still give
// password authentication a chance to succeed
if (this.serviceIsForeground(serviceName)) {
this._verificationFailed(true);
}
},
});
Signals.addSignalMethods(ShellUserVerifier.prototype);