diff options
Diffstat (limited to 'src/VBox/Additions/linux/lightdm-greeter/liblightdm-gobject-1.5.0/greeter.c')
| -rw-r--r-- | src/VBox/Additions/linux/lightdm-greeter/liblightdm-gobject-1.5.0/greeter.c | 1442 |
1 files changed, 1442 insertions, 0 deletions
diff --git a/src/VBox/Additions/linux/lightdm-greeter/liblightdm-gobject-1.5.0/greeter.c b/src/VBox/Additions/linux/lightdm-greeter/liblightdm-gobject-1.5.0/greeter.c new file mode 100644 index 00000000..3d44b562 --- /dev/null +++ b/src/VBox/Additions/linux/lightdm-greeter/liblightdm-gobject-1.5.0/greeter.c @@ -0,0 +1,1442 @@ +/* + * Copyright (C) 2010 Robert Ancell. + * Author: Robert Ancell <robert.ancell@canonical.com> + * + * This library is free software; you can redistribute it and/or modify it under + * the terms of the GNU Lesser General Public License as published by the Free + * Software Foundation; either version 2 or version 3 of the License. + * See http://www.gnu.org/copyleft/lgpl.html the full text of the license. + */ + +/* + * Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice + * other than GPL or LGPL is available it will apply instead, Oracle elects to use only + * the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where + * a choice of LGPL license versions is made available with the language indicating + * that LGPLv2 or any later version may be used, or where a choice of which version + * of the LGPL is applied is otherwise unspecified. + */ + +#include "config.h" + +#include <stdlib.h> +#include <string.h> +#include <security/pam_appl.h> + +#include "lightdm/greeter.h" + +enum { + PROP_0, + PROP_DEFAULT_SESSION_HINT, + PROP_HIDE_USERS_HINT, + PROP_SHOW_MANUAL_LOGIN_HINT, + PROP_SHOW_REMOTE_LOGIN_HINT, + PROP_LOCK_HINT, + PROP_HAS_GUEST_ACCOUNT_HINT, + PROP_SELECT_USER_HINT, + PROP_SELECT_GUEST_HINT, + PROP_AUTOLOGIN_USER_HINT, + PROP_AUTOLOGIN_GUEST_HINT, + PROP_AUTOLOGIN_TIMEOUT_HINT, + PROP_AUTHENTICATION_USER, + PROP_IN_AUTHENTICATION, + PROP_IS_AUTHENTICATED, +}; + +enum { + SHOW_PROMPT, + SHOW_MESSAGE, + AUTHENTICATION_COMPLETE, + AUTOLOGIN_TIMER_EXPIRED, + LAST_SIGNAL +}; +static guint signals[LAST_SIGNAL] = { 0 }; + +typedef struct +{ + gboolean connected; + + GIOChannel *to_server_channel, *from_server_channel; + guint8 *read_buffer; + gsize n_read; + + gsize n_responses_waiting; + GList *responses_received; + + GHashTable *hints; + guint autologin_timeout; + + gchar *authentication_user; + gboolean in_authentication; + gboolean is_authenticated; + guint32 authenticate_sequence_number; + gboolean cancelling_authentication; +} LightDMGreeterPrivate; + +G_DEFINE_TYPE (LightDMGreeter, lightdm_greeter, G_TYPE_OBJECT); + +#define GET_PRIVATE(obj) G_TYPE_INSTANCE_GET_PRIVATE ((obj), LIGHTDM_TYPE_GREETER, LightDMGreeterPrivate) + +#define HEADER_SIZE 8 +#define MAX_MESSAGE_LENGTH 1024 + +/* Messages from the greeter to the server */ +typedef enum +{ + GREETER_MESSAGE_CONNECT = 0, + GREETER_MESSAGE_AUTHENTICATE, + GREETER_MESSAGE_AUTHENTICATE_AS_GUEST, + GREETER_MESSAGE_CONTINUE_AUTHENTICATION, + GREETER_MESSAGE_START_SESSION, + GREETER_MESSAGE_CANCEL_AUTHENTICATION, + GREETER_MESSAGE_SET_LANGUAGE, + GREETER_MESSAGE_AUTHENTICATE_REMOTE +} GreeterMessage; + +/* Messages from the server to the greeter */ +typedef enum +{ + SERVER_MESSAGE_CONNECTED = 0, + SERVER_MESSAGE_PROMPT_AUTHENTICATION, + SERVER_MESSAGE_END_AUTHENTICATION, + SERVER_MESSAGE_SESSION_RESULT +} ServerMessage; + +/** + * lightdm_greeter_new: + * + * Create a new greeter. + * + * Return value: the new #LightDMGreeter + **/ +LightDMGreeter * +lightdm_greeter_new () +{ + return g_object_new (LIGHTDM_TYPE_GREETER, NULL); +} + +static gboolean +timed_login_cb (gpointer data) +{ + LightDMGreeter *greeter = data; + LightDMGreeterPrivate *priv = GET_PRIVATE (greeter); + + priv->autologin_timeout = 0; + g_signal_emit (G_OBJECT (greeter), signals[AUTOLOGIN_TIMER_EXPIRED], 0); + + return FALSE; +} + +static guint32 +int_length () +{ + return 4; +} + +static void +write_int (guint8 *buffer, gint buffer_length, guint32 value, gsize *offset) +{ + if (*offset + 4 >= buffer_length) + return; + buffer[*offset] = value >> 24; + buffer[*offset+1] = (value >> 16) & 0xFF; + buffer[*offset+2] = (value >> 8) & 0xFF; + buffer[*offset+3] = value & 0xFF; + *offset += 4; +} + +static void +write_string (guint8 *buffer, gint buffer_length, const gchar *value, gsize *offset) +{ + gint length = 0; + + if (value) + length = strlen (value); + write_int (buffer, buffer_length, length, offset); + if (*offset + length >= buffer_length) + return; + memcpy (buffer + *offset, value, length); + *offset += length; +} + +static guint32 +read_int (guint8 *message, gsize message_length, gsize *offset) +{ + guint32 value; + guint8 *buffer; + + if (message_length - *offset < int_length ()) + { + g_warning ("Not enough space for int, need %i, got %zi", int_length (), message_length - *offset); + return 0; + } + + buffer = message + *offset; + value = buffer[0] << 24 | buffer[1] << 16 | buffer[2] << 8 | buffer[3]; + *offset += int_length (); + + return value; +} + +static gchar * +read_string (guint8 *message, gsize message_length, gsize *offset) +{ + guint32 length; + gchar *value; + + length = read_int (message, message_length, offset); + if (message_length - *offset < length) + { + g_warning ("Not enough space for string, need %u, got %zu", length, message_length - *offset); + return g_strdup (""); + } + + value = g_malloc (sizeof (gchar) * (length + 1)); + memcpy (value, message + *offset, length); + value[length] = '\0'; + *offset += length; + + return value; +} + +static guint32 +string_length (const gchar *value) +{ + if (value) + return int_length () + strlen (value); + else + return int_length (); +} + +static void +write_header (guint8 *buffer, gint buffer_length, guint32 id, guint32 length, gsize *offset) +{ + write_int (buffer, buffer_length, id, offset); + write_int (buffer, buffer_length, length, offset); +} + +static guint32 +get_message_length (guint8 *message, gsize message_length) +{ + gsize offset = 4; + return read_int (message, message_length, &offset); +} + +static void +write_message (LightDMGreeter *greeter, guint8 *message, gsize message_length) +{ + LightDMGreeterPrivate *priv = GET_PRIVATE (greeter); + GIOStatus status; + GError *error = NULL; + guint32 stated_length; + + /* Double check that we're sending well-formed messages. If we say we're + sending more than we do, we end up DOS'ing lightdm as it waits for the + rest. If we say we're sending less than we do, we confuse the heck out + of lightdm, as it starts reading headers from the middle of our + messages. */ + stated_length = HEADER_SIZE + get_message_length (message, message_length); + if (stated_length != message_length) + { + g_warning ("Refusing to write malformed packet to daemon: declared size is %u, but actual size is %zu", stated_length, message_length); + return; + } + + status = g_io_channel_write_chars (priv->to_server_channel, (gchar *) message, message_length, NULL, &error); + if (error) + g_warning ("Error writing to daemon: %s", error->message); + g_clear_error (&error); + if (status == G_IO_STATUS_NORMAL) + g_debug ("Wrote %zi bytes to daemon", message_length); + g_io_channel_flush (priv->to_server_channel, NULL); +} + +static void +handle_connected (LightDMGreeter *greeter, guint8 *message, gsize message_length, gsize *offset) +{ + LightDMGreeterPrivate *priv = GET_PRIVATE (greeter); + gchar *version; + GString *hint_string; + int timeout; + + version = read_string (message, message_length, offset); + hint_string = g_string_new (""); + while (*offset < message_length) + { + gchar *name, *value; + + name = read_string (message, message_length, offset); + value = read_string (message, message_length, offset); + g_hash_table_insert (priv->hints, name, value); + g_string_append_printf (hint_string, " %s=%s", name, value); + } + + g_debug ("Connected version=%s%s", version, hint_string->str); + g_free (version); + g_string_free (hint_string, TRUE); + + /* Set timeout for default login */ + timeout = lightdm_greeter_get_autologin_timeout_hint (greeter); + if (timeout) + { + g_debug ("Setting autologin timer for %d seconds", timeout); + priv->autologin_timeout = g_timeout_add (timeout * 1000, timed_login_cb, greeter); + } +} + +static void +handle_prompt_authentication (LightDMGreeter *greeter, guint8 *message, gsize message_length, gsize *offset) +{ + LightDMGreeterPrivate *priv = GET_PRIVATE (greeter); + guint32 sequence_number, n_messages, i; + gchar *username; + + sequence_number = read_int (message, message_length, offset); + if (sequence_number != priv->authenticate_sequence_number) + { + g_debug ("Ignoring prompt authentication with invalid sequence number %d", sequence_number); + return; + } + + if (priv->cancelling_authentication) + { + g_debug ("Ignoring prompt authentication as waiting for it to cancel"); + return; + } + + /* Update username */ + username = read_string (message, message_length, offset); + if (strcmp (username, "") == 0) + { + g_free (username); + username = NULL; + } + g_free (priv->authentication_user); + priv->authentication_user = username; + + g_list_free_full (priv->responses_received, g_free); + priv->responses_received = NULL; + priv->n_responses_waiting = 0; + + n_messages = read_int (message, message_length, offset); + g_debug ("Prompt user with %d message(s)", n_messages); + + for (i = 0; i < n_messages; i++) + { + int style; + gchar *text; + + style = read_int (message, message_length, offset); + text = read_string (message, message_length, offset); + + // FIXME: Should stop on prompts? + switch (style) + { + case PAM_PROMPT_ECHO_OFF: + priv->n_responses_waiting++; + g_signal_emit (G_OBJECT (greeter), signals[SHOW_PROMPT], 0, text, LIGHTDM_PROMPT_TYPE_SECRET); + break; + case PAM_PROMPT_ECHO_ON: + priv->n_responses_waiting++; + g_signal_emit (G_OBJECT (greeter), signals[SHOW_PROMPT], 0, text, LIGHTDM_PROMPT_TYPE_QUESTION); + break; + case PAM_ERROR_MSG: + g_signal_emit (G_OBJECT (greeter), signals[SHOW_MESSAGE], 0, text, LIGHTDM_MESSAGE_TYPE_ERROR); + break; + case PAM_TEXT_INFO: + g_signal_emit (G_OBJECT (greeter), signals[SHOW_MESSAGE], 0, text, LIGHTDM_MESSAGE_TYPE_INFO); + break; + } + + g_free (text); + } +} + +static void +handle_end_authentication (LightDMGreeter *greeter, guint8 *message, gsize message_length, gsize *offset) +{ + LightDMGreeterPrivate *priv = GET_PRIVATE (greeter); + guint32 sequence_number, return_code; + gchar *username; + + sequence_number = read_int (message, message_length, offset); + + if (sequence_number != priv->authenticate_sequence_number) + { + g_debug ("Ignoring end authentication with invalid sequence number %d", sequence_number); + return; + } + + username = read_string (message, message_length, offset); + return_code = read_int (message, message_length, offset); + + g_debug ("Authentication complete for user %s with return code %d", username, return_code); + + /* Update username */ + if (strcmp (username, "") == 0) + { + g_free (username); + username = NULL; + } + g_free (priv->authentication_user); + priv->authentication_user = username; + + priv->cancelling_authentication = FALSE; + priv->is_authenticated = (return_code == 0); + + priv->in_authentication = FALSE; + g_signal_emit (G_OBJECT (greeter), signals[AUTHENTICATION_COMPLETE], 0); +} + +static guint8 * +read_message (LightDMGreeter *greeter, gsize *length, gboolean block) +{ + LightDMGreeterPrivate *priv = GET_PRIVATE (greeter); + gsize n_to_read, n_read; + guint8 *buffer; + GError *error = NULL; + + /* Read the header, or the whole message if we already have that */ + n_to_read = HEADER_SIZE; + if (priv->n_read >= HEADER_SIZE) + n_to_read += get_message_length (priv->read_buffer, priv->n_read); + + do + { + GIOStatus status; + status = g_io_channel_read_chars (priv->from_server_channel, + (gchar *) priv->read_buffer + priv->n_read, + n_to_read - priv->n_read, + &n_read, + &error); + if (error) + g_warning ("Error reading from server: %s", error->message); + g_clear_error (&error); + if (status != G_IO_STATUS_NORMAL) + break; + + g_debug ("Read %zi bytes from daemon", n_read); + + priv->n_read += n_read; + } while (priv->n_read < n_to_read && block); + + /* Stop if haven't got all the data we want */ + if (priv->n_read != n_to_read) + return FALSE; + + /* If have header, rerun for content */ + if (priv->n_read == HEADER_SIZE) + { + n_to_read = get_message_length (priv->read_buffer, priv->n_read); + if (n_to_read > 0) + { + priv->read_buffer = g_realloc (priv->read_buffer, HEADER_SIZE + n_to_read); + return read_message (greeter, length, block); + } + } + + buffer = priv->read_buffer; + *length = priv->n_read; + + priv->read_buffer = g_malloc (priv->n_read); + priv->n_read = 0; + + return buffer; +} + +static gboolean +from_server_cb (GIOChannel *source, GIOCondition condition, gpointer data) +{ + LightDMGreeter *greeter = data; + guint8 *message; + gsize message_length, offset; + guint32 id; + + message = read_message (greeter, &message_length, FALSE); + if (!message) + return TRUE; + + offset = 0; + id = read_int (message, message_length, &offset); + read_int (message, message_length, &offset); + switch (id) + { + case SERVER_MESSAGE_PROMPT_AUTHENTICATION: + handle_prompt_authentication (greeter, message, message_length, &offset); + break; + case SERVER_MESSAGE_END_AUTHENTICATION: + handle_end_authentication (greeter, message, message_length, &offset); + break; + default: + g_warning ("Unknown message from server: %d", id); + break; + } + g_free (message); + + return TRUE; +} + +/** + * lightdm_greeter_connect_sync: + * @greeter: The greeter to connect + * @error: return location for a #GError, or %NULL + * + * Connects the greeter to the display manager. Will block until connected. + * + * Return value: #TRUE if successfully connected + **/ +gboolean +lightdm_greeter_connect_sync (LightDMGreeter *greeter, GError **error) +{ + LightDMGreeterPrivate *priv; + const gchar *fd; + guint8 message[MAX_MESSAGE_LENGTH]; + guint8 *response; + gsize response_length, offset = 0; + guint32 id; + + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), FALSE); + + priv = GET_PRIVATE (greeter); + + fd = g_getenv ("LIGHTDM_TO_SERVER_FD"); + if (!fd) + { + g_warning ("No LIGHTDM_TO_SERVER_FD environment variable"); + return FALSE; + } + priv->to_server_channel = g_io_channel_unix_new (atoi (fd)); + g_io_channel_set_encoding (priv->to_server_channel, NULL, NULL); + + fd = g_getenv ("LIGHTDM_FROM_SERVER_FD"); + if (!fd) + { + g_warning ("No LIGHTDM_FROM_SERVER_FD environment variable"); + return FALSE; + } + priv->from_server_channel = g_io_channel_unix_new (atoi (fd)); + g_io_channel_set_encoding (priv->from_server_channel, NULL, NULL); + g_io_add_watch (priv->from_server_channel, G_IO_IN, from_server_cb, greeter); + + g_debug ("Connecting to display manager..."); + write_header (message, MAX_MESSAGE_LENGTH, GREETER_MESSAGE_CONNECT, string_length (VERSION), &offset); + write_string (message, MAX_MESSAGE_LENGTH, VERSION, &offset); + write_message (greeter, message, offset); + + response = read_message (greeter, &response_length, TRUE); + if (!response) + return FALSE; + + offset = 0; + id = read_int (response, response_length, &offset); + read_int (response, response_length, &offset); + if (id == SERVER_MESSAGE_CONNECTED) + handle_connected (greeter, response, response_length, &offset); + g_free (response); + if (id != SERVER_MESSAGE_CONNECTED) + { + g_warning ("Expected CONNECTED message, got %d", id); + return FALSE; + } + + priv->connected = TRUE; + + return TRUE; +} + +/** + * lightdm_greeter_get_hint: + * @greeter: A #LightDMGreeter + * @name: The hint name to query. + * + * Get a hint. + * + * Return value: The value for this hint or #NULL if not set. + **/ +const gchar * +lightdm_greeter_get_hint (LightDMGreeter *greeter, const gchar *name) +{ + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), NULL); + return g_hash_table_lookup (GET_PRIVATE (greeter)->hints, name); +} + +/** + * lightdm_greeter_get_default_session_hint: + * @greeter: A #LightDMGreeter + * + * Get the default session to use. + * + * Return value: The session name + **/ +const gchar * +lightdm_greeter_get_default_session_hint (LightDMGreeter *greeter) +{ + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), NULL); + return lightdm_greeter_get_hint (greeter, "default-session"); +} + +/** + * lightdm_greeter_get_hide_users_hint: + * @greeter: A #LightDMGreeter + * + * Check if user accounts should be shown. If this is TRUE then the list of + * accounts should be taken from #LightDMUserList and displayed in the greeter + * for the user to choose from. Note that this list can be empty and it is + * recommended you show a method for the user to enter a username manually. + * + * If this option is shown the greeter should only allow these users to be + * chosen for login unless the manual login hint is set. + * + * Return value: #TRUE if the available users should not be shown. + */ +gboolean +lightdm_greeter_get_hide_users_hint (LightDMGreeter *greeter) +{ + const gchar *value; + + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), FALSE); + value = lightdm_greeter_get_hint (greeter, "hide-users"); + + return g_strcmp0 (value, "true") == 0; +} + +/** + * lightdm_greeter_get_show_manual_login_hint: + * @greeter: A #LightDMGreeter + * + * Check if a manual login option should be shown. If set the GUI + * should provide a way for a username to be entered manually. + * Without this hint a greeter which is showing a user list can + * limit logins to only those users. + * + * Return value: #TRUE if a manual login option should be shown. + */ +gboolean +lightdm_greeter_get_show_manual_login_hint (LightDMGreeter *greeter) +{ + const gchar *value; + + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), FALSE); + value = lightdm_greeter_get_hint (greeter, "show-manual-login"); + + return g_strcmp0 (value, "true") == 0; +} + +/** + * lightdm_greeter_get_show_remote_login_hint: + * @greeter: A #LightDMGreeter + * + * Check if a remote login option should be shown. If set the GUI + * should provide a way for a user to log into a remote desktop server. + * + * Return value: #TRUE if a remote login option should be shown. + */ +gboolean +lightdm_greeter_get_show_remote_login_hint (LightDMGreeter *greeter) +{ + const gchar *value; + + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), FALSE); + value = lightdm_greeter_get_hint (greeter, "show-remote-login"); + + return g_strcmp0 (value, "true") == 0; +} + +/** + * lightdm_greeter_get_lock_hint: + * @greeter: A #LightDMGreeter + * + * Check if the greeter is acting as a lock screen. + * + * Return value: #TRUE if the greeter was triggered by locking the seat. + */ +gboolean +lightdm_greeter_get_lock_hint (LightDMGreeter *greeter) +{ + const gchar *value; + + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), FALSE); + value = lightdm_greeter_get_hint (greeter, "lock-screen"); + + return g_strcmp0 (value, "true") == 0; +} + +/** + * lightdm_greeter_get_has_guest_account_hint: + * @greeter: A #LightDMGreeter + * + * Check if guest sessions are supported. + * + * Return value: #TRUE if guest sessions are supported. + */ +gboolean +lightdm_greeter_get_has_guest_account_hint (LightDMGreeter *greeter) +{ + const gchar *value; + + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), FALSE); + value = lightdm_greeter_get_hint (greeter, "has-guest-account"); + + return g_strcmp0 (value, "true") == 0; +} + +/** + * lightdm_greeter_get_select_user_hint: + * @greeter: A #LightDMGreeter + * + * Get the user to select by default. + * + * Return value: A username + */ +const gchar * +lightdm_greeter_get_select_user_hint (LightDMGreeter *greeter) +{ + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), NULL); + return lightdm_greeter_get_hint (greeter, "select-user"); +} + +/** + * lightdm_greeter_get_select_guest_hint: + * @greeter: A #LightDMGreeter + * + * Check if the guest account should be selected by default. + * + * Return value: #TRUE if the guest account should be selected by default. + */ +gboolean +lightdm_greeter_get_select_guest_hint (LightDMGreeter *greeter) +{ + const gchar *value; + + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), FALSE); + value = lightdm_greeter_get_hint (greeter, "select-guest"); + + return g_strcmp0 (value, "true") == 0; +} + +/** + * lightdm_greeter_get_autologin_user_hint: + * @greeter: A #LightDMGreeter + * + * Get the user account to automatically logg into when the timer expires. + * + * Return value: The user account to automatically log into. + */ +const gchar * +lightdm_greeter_get_autologin_user_hint (LightDMGreeter *greeter) +{ + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), NULL); + return lightdm_greeter_get_hint (greeter, "autologin-user"); +} + +/** + * lightdm_greeter_get_autologin_guest_hint: + * @greeter: A #LightDMGreeter + * + * Check if the guest account should be automatically logged into when the timer expires. + * + * Return value: #TRUE if the guest account should be automatically logged into. + */ +gboolean +lightdm_greeter_get_autologin_guest_hint (LightDMGreeter *greeter) +{ + const gchar *value; + + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), FALSE); + value = lightdm_greeter_get_hint (greeter, "autologin-guest"); + + return g_strcmp0 (value, "true") == 0; +} + +/** + * lightdm_greeter_get_autologin_timeout_hint: + * @greeter: A #LightDMGreeter + * + * Get the number of seconds to wait before automaitcally logging in. + * + * Return value: The number of seconds to wait before automatically logging in or 0 for no timeout. + */ +gint +lightdm_greeter_get_autologin_timeout_hint (LightDMGreeter *greeter) +{ + const gchar *value; + gint timeout = 0; + + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), FALSE); + value = lightdm_greeter_get_hint (greeter, "autologin-timeout"); + if (value) + timeout = atoi (value); + if (timeout < 0) + timeout = 0; + + return timeout; +} + +/** + * lightdm_greeter_cancel_autologin: + * @greeter: A #LightDMGreeter + * + * Cancel the automatic login. + */ +void +lightdm_greeter_cancel_autologin (LightDMGreeter *greeter) +{ + LightDMGreeterPrivate *priv; + + g_return_if_fail (LIGHTDM_IS_GREETER (greeter)); + + priv = GET_PRIVATE (greeter); + + if (priv->autologin_timeout) + g_source_remove (priv->autologin_timeout); + priv->autologin_timeout = 0; +} + +/** + * lightdm_greeter_authenticate: + * @greeter: A #LightDMGreeter + * @username: (allow-none): A username or #NULL to prompt for a username. + * + * Starts the authentication procedure for a user. + **/ +void +lightdm_greeter_authenticate (LightDMGreeter *greeter, const gchar *username) +{ + LightDMGreeterPrivate *priv; + guint8 message[MAX_MESSAGE_LENGTH]; + gsize offset = 0; + + g_return_if_fail (LIGHTDM_IS_GREETER (greeter)); + + priv = GET_PRIVATE (greeter); + + g_return_if_fail (priv->connected); + + priv->cancelling_authentication = FALSE; + priv->authenticate_sequence_number++; + priv->in_authentication = TRUE; + priv->is_authenticated = FALSE; + if (username != priv->authentication_user) + { + g_free (priv->authentication_user); + priv->authentication_user = g_strdup (username); + } + + g_debug ("Starting authentication for user %s...", username); + write_header (message, MAX_MESSAGE_LENGTH, GREETER_MESSAGE_AUTHENTICATE, int_length () + string_length (username), &offset); + write_int (message, MAX_MESSAGE_LENGTH, priv->authenticate_sequence_number, &offset); + write_string (message, MAX_MESSAGE_LENGTH, username, &offset); + write_message (greeter, message, offset); +} + +/** + * lightdm_greeter_authenticate_as_guest: + * @greeter: A #LightDMGreeter + * + * Starts the authentication procedure for the guest user. + **/ +void +lightdm_greeter_authenticate_as_guest (LightDMGreeter *greeter) +{ + LightDMGreeterPrivate *priv; + guint8 message[MAX_MESSAGE_LENGTH]; + gsize offset = 0; + + g_return_if_fail (LIGHTDM_IS_GREETER (greeter)); + + priv = GET_PRIVATE (greeter); + + g_return_if_fail (priv->connected); + + priv->cancelling_authentication = FALSE; + priv->authenticate_sequence_number++; + priv->in_authentication = TRUE; + priv->is_authenticated = FALSE; + g_free (priv->authentication_user); + priv->authentication_user = NULL; + + g_debug ("Starting authentication for guest account..."); + write_header (message, MAX_MESSAGE_LENGTH, GREETER_MESSAGE_AUTHENTICATE_AS_GUEST, int_length (), &offset); + write_int (message, MAX_MESSAGE_LENGTH, priv->authenticate_sequence_number, &offset); + write_message (greeter, message, offset); +} + +/** + * lightdm_greeter_authenticate_autologin: + * @greeter: A #LightDMGreeter + * + * Starts the authentication procedure for the automatic login user. + **/ +void +lightdm_greeter_authenticate_autologin (LightDMGreeter *greeter) +{ + const gchar *user; + + user = lightdm_greeter_get_autologin_user_hint (greeter); + if (lightdm_greeter_get_autologin_guest_hint (greeter)) + lightdm_greeter_authenticate_as_guest (greeter); + else if (user) + lightdm_greeter_authenticate (greeter, user); +} + +/** + * lightdm_greeter_authenticate_remote: + * @greeter: A #LightDMGreeter + * @session: The name of a remote session + * @username: (allow-none): A username of #NULL to prompt for a username. + * + * Start authentication for a remote session type. + **/ +void +lightdm_greeter_authenticate_remote (LightDMGreeter *greeter, const gchar *session, const gchar *username) +{ + LightDMGreeterPrivate *priv; + guint8 message[MAX_MESSAGE_LENGTH]; + gsize offset = 0; + + g_return_if_fail (LIGHTDM_IS_GREETER (greeter)); + + priv = GET_PRIVATE (greeter); + + g_return_if_fail (priv->connected); + + priv->cancelling_authentication = FALSE; + priv->authenticate_sequence_number++; + priv->in_authentication = TRUE; + priv->is_authenticated = FALSE; + g_free (priv->authentication_user); + priv->authentication_user = NULL; + + if (username) + g_debug ("Starting authentication for remote session %s as user %s...", session, username); + else + g_debug ("Starting authentication for remote session %s...", session); + write_header (message, MAX_MESSAGE_LENGTH, GREETER_MESSAGE_AUTHENTICATE_REMOTE, int_length () + string_length (session) + string_length (username), &offset); + write_int (message, MAX_MESSAGE_LENGTH, priv->authenticate_sequence_number, &offset); + write_string (message, MAX_MESSAGE_LENGTH, session, &offset); + write_string (message, MAX_MESSAGE_LENGTH, username, &offset); + write_message (greeter, message, offset); +} + +/** + * lightdm_greeter_respond: + * @greeter: A #LightDMGreeter + * @response: Response to a prompt + * + * Provide response to a prompt. May be one in a series. + **/ +void +lightdm_greeter_respond (LightDMGreeter *greeter, const gchar *response) +{ + LightDMGreeterPrivate *priv; + guint8 message[MAX_MESSAGE_LENGTH]; + gsize offset = 0; + + g_return_if_fail (LIGHTDM_IS_GREETER (greeter)); + g_return_if_fail (response != NULL); + + priv = GET_PRIVATE (greeter); + + g_return_if_fail (priv->connected); + g_return_if_fail (priv->n_responses_waiting > 0); + + priv->n_responses_waiting--; + priv->responses_received = g_list_append (priv->responses_received, g_strdup (response)); + + if (priv->n_responses_waiting == 0) + { + guint32 msg_length; + GList *iter; + + g_debug ("Providing response to display manager"); + + msg_length = int_length (); + for (iter = priv->responses_received; iter; iter = iter->next) + { + msg_length += string_length ((gchar *)iter->data); + } + + write_header (message, MAX_MESSAGE_LENGTH, GREETER_MESSAGE_CONTINUE_AUTHENTICATION, msg_length, &offset); + write_int (message, MAX_MESSAGE_LENGTH, g_list_length (priv->responses_received), &offset); + for (iter = priv->responses_received; iter; iter = iter->next) + { + write_string (message, MAX_MESSAGE_LENGTH, (gchar *)iter->data, &offset); + } + write_message (greeter, message, offset); + + g_list_free_full (priv->responses_received, g_free); + priv->responses_received = NULL; + } +} + +/** + * lightdm_greeter_cancel_authentication: + * @greeter: A #LightDMGreeter + * + * Cancel the current user authentication. + **/ +void +lightdm_greeter_cancel_authentication (LightDMGreeter *greeter) +{ + LightDMGreeterPrivate *priv; + guint8 message[MAX_MESSAGE_LENGTH]; + gsize offset = 0; + + g_return_if_fail (LIGHTDM_IS_GREETER (greeter)); + + priv = GET_PRIVATE (greeter); + + g_return_if_fail (priv->connected); + + priv->cancelling_authentication = TRUE; + write_header (message, MAX_MESSAGE_LENGTH, GREETER_MESSAGE_CANCEL_AUTHENTICATION, 0, &offset); + write_message (greeter, message, offset); +} + +/** + * lightdm_greeter_get_in_authentication: + * @greeter: A #LightDMGreeter + * + * Checks if the greeter is in the process of authenticating. + * + * Return value: #TRUE if the greeter is authenticating a user. + **/ +gboolean +lightdm_greeter_get_in_authentication (LightDMGreeter *greeter) +{ + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), FALSE); + return GET_PRIVATE (greeter)->in_authentication; +} + +/** + * lightdm_greeter_get_is_authenticated: + * @greeter: A #LightDMGreeter + * + * Checks if the greeter has successfully authenticated. + * + * Return value: #TRUE if the greeter is authenticated for login. + **/ +gboolean +lightdm_greeter_get_is_authenticated (LightDMGreeter *greeter) +{ + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), FALSE); + return GET_PRIVATE (greeter)->is_authenticated; +} + +/** + * lightdm_greeter_get_authentication_user: + * @greeter: A #LightDMGreeter + * + * Get the user that is being authenticated. + * + * Return value: The username of the authentication user being authenticated or #NULL if no authentication in progress. + */ +const gchar * +lightdm_greeter_get_authentication_user (LightDMGreeter *greeter) +{ + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), NULL); + return GET_PRIVATE (greeter)->authentication_user; +} + +/** + * lightdm_greeter_set_language: + * @greeter: A #LightDMGreeter + * @language: The language to use for this user. + * + * Set the language for the currently authenticated user. + **/ +void +lightdm_greeter_set_language (LightDMGreeter *greeter, const gchar *language) +{ + LightDMGreeterPrivate *priv; + guint8 message[MAX_MESSAGE_LENGTH]; + gsize offset = 0; + + g_return_if_fail (LIGHTDM_IS_GREETER (greeter)); + + priv = GET_PRIVATE (greeter); + + g_return_if_fail (priv->connected); + + write_header (message, MAX_MESSAGE_LENGTH, GREETER_MESSAGE_SET_LANGUAGE, string_length (language), &offset); + write_string (message, MAX_MESSAGE_LENGTH, language, &offset); + write_message (greeter, message, offset); +} + +/** + * lightdm_greeter_start_session_sync: + * @greeter: A #LightDMGreeter + * @session: (allow-none): The session to log into or #NULL to use the default. + * @error: return location for a #GError, or %NULL + * + * Start a session for the authenticated user. + * + * Return value: TRUE if the session was started. + **/ +gboolean +lightdm_greeter_start_session_sync (LightDMGreeter *greeter, const gchar *session, GError **error) +{ + LightDMGreeterPrivate *priv; + guint8 message[MAX_MESSAGE_LENGTH]; + guint8 *response; + gsize response_length, offset = 0; + guint32 id, return_code = 1; + + g_return_val_if_fail (LIGHTDM_IS_GREETER (greeter), FALSE); + + priv = GET_PRIVATE (greeter); + + g_return_val_if_fail (priv->connected, FALSE); + g_return_val_if_fail (priv->is_authenticated, FALSE); + + if (session) + g_debug ("Starting session %s", session); + else + g_debug ("Starting default session"); + + write_header (message, MAX_MESSAGE_LENGTH, GREETER_MESSAGE_START_SESSION, string_length (session), &offset); + write_string (message, MAX_MESSAGE_LENGTH, session, &offset); + write_message (greeter, message, offset); + + response = read_message (greeter, &response_length, TRUE); + if (!response) + return FALSE; + + offset = 0; + id = read_int (response, response_length, &offset); + read_int (response, response_length, &offset); + if (id == SERVER_MESSAGE_SESSION_RESULT) + return_code = read_int (response, response_length, &offset); + else + g_warning ("Expected SESSION_RESULT message, got %d", id); + + g_free (response); + + return return_code == 0; +} + +static void +lightdm_greeter_init (LightDMGreeter *greeter) +{ + LightDMGreeterPrivate *priv = GET_PRIVATE (greeter); + + priv->read_buffer = g_malloc (HEADER_SIZE); + priv->hints = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free); +} + +static void +lightdm_greeter_set_property (GObject *object, + guint prop_id, + const GValue *value, + GParamSpec *pspec) +{ + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); +} + +static void +lightdm_greeter_get_property (GObject *object, + guint prop_id, + GValue *value, + GParamSpec *pspec) +{ + LightDMGreeter *self; + + self = LIGHTDM_GREETER (object); + + switch (prop_id) { + case PROP_DEFAULT_SESSION_HINT: + g_value_set_string (value, lightdm_greeter_get_default_session_hint (self)); + break; + case PROP_HIDE_USERS_HINT: + g_value_set_boolean (value, lightdm_greeter_get_hide_users_hint (self)); + break; + case PROP_SHOW_MANUAL_LOGIN_HINT: + g_value_set_boolean (value, lightdm_greeter_get_show_manual_login_hint (self)); + break; + case PROP_SHOW_REMOTE_LOGIN_HINT: + g_value_set_boolean (value, lightdm_greeter_get_show_remote_login_hint (self)); + break; + case PROP_LOCK_HINT: + g_value_set_boolean (value, lightdm_greeter_get_lock_hint (self)); + break; + case PROP_HAS_GUEST_ACCOUNT_HINT: + g_value_set_boolean (value, lightdm_greeter_get_has_guest_account_hint (self)); + break; + case PROP_SELECT_USER_HINT: + g_value_set_string (value, lightdm_greeter_get_select_user_hint (self)); + break; + case PROP_SELECT_GUEST_HINT: + g_value_set_boolean (value, lightdm_greeter_get_select_guest_hint (self)); + break; + case PROP_AUTOLOGIN_USER_HINT: + g_value_set_string (value, lightdm_greeter_get_autologin_user_hint (self)); + break; + case PROP_AUTOLOGIN_GUEST_HINT: + g_value_set_boolean (value, lightdm_greeter_get_autologin_guest_hint (self)); + break; + case PROP_AUTOLOGIN_TIMEOUT_HINT: + g_value_set_int (value, lightdm_greeter_get_autologin_timeout_hint (self)); + break; + case PROP_AUTHENTICATION_USER: + g_value_set_string (value, lightdm_greeter_get_authentication_user (self)); + break; + case PROP_IN_AUTHENTICATION: + g_value_set_boolean (value, lightdm_greeter_get_in_authentication (self)); + break; + case PROP_IS_AUTHENTICATED: + g_value_set_boolean (value, lightdm_greeter_get_is_authenticated (self)); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static void +marshal_VOID__STRING_INT (GClosure *closure, + GValue *return_value G_GNUC_UNUSED, + guint n_param_values, + const GValue *param_values, + gpointer invocation_hint G_GNUC_UNUSED, + gpointer marshal_data) +{ + typedef void (*GMarshalFunc_VOID__STRING_INT) (gpointer data1, + gpointer arg_1, + gint arg_2, + gpointer data2); + register GMarshalFunc_VOID__STRING_INT callback; + register GCClosure *cc = (GCClosure*) closure; + register gpointer data1, data2; + + g_return_if_fail (n_param_values == 3); + + if (G_CCLOSURE_SWAP_DATA (closure)) + { + data1 = closure->data; + data2 = g_value_peek_pointer (param_values + 0); + } + else + { + data1 = g_value_peek_pointer (param_values + 0); + data2 = closure->data; + } + callback = (GMarshalFunc_VOID__STRING_INT) (marshal_data ? marshal_data : cc->callback); + + callback (data1, + (param_values + 1)->data[0].v_pointer, + (param_values + 2)->data[0].v_int, + data2); +} + +static void +lightdm_greeter_finalize (GObject *object) +{ + LightDMGreeter *self = LIGHTDM_GREETER (object); + LightDMGreeterPrivate *priv = GET_PRIVATE (self); + + if (priv->to_server_channel) + g_io_channel_unref (priv->to_server_channel); + if (priv->from_server_channel) + g_io_channel_unref (priv->from_server_channel); + g_free (priv->authentication_user); + g_hash_table_unref (priv->hints); + + G_OBJECT_CLASS (lightdm_greeter_parent_class)->finalize (object); +} + +static void +lightdm_greeter_class_init (LightDMGreeterClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + + g_type_class_add_private (klass, sizeof (LightDMGreeterPrivate)); + + object_class->set_property = lightdm_greeter_set_property; + object_class->get_property = lightdm_greeter_get_property; + object_class->finalize = lightdm_greeter_finalize; + + g_object_class_install_property (object_class, + PROP_DEFAULT_SESSION_HINT, + g_param_spec_string ("default-session-hint", + "default-session-hint", + "Default session hint", + NULL, + G_PARAM_READWRITE)); + + g_object_class_install_property (object_class, + PROP_HIDE_USERS_HINT, + g_param_spec_boolean ("hide-users-hint", + "hide-users-hint", + "Hide users hint", + FALSE, + G_PARAM_READABLE)); + + g_object_class_install_property (object_class, + PROP_SHOW_MANUAL_LOGIN_HINT, + g_param_spec_boolean ("show-manual-login-hint", + "show-manual-login-hint", + "Show manual login hint", + FALSE, + G_PARAM_READABLE)); + + g_object_class_install_property (object_class, + PROP_SHOW_REMOTE_LOGIN_HINT, + g_param_spec_boolean ("show-remote-login-hint", + "show-remote-login-hint", + "Show remote login hint", + FALSE, + G_PARAM_READABLE)); + + g_object_class_install_property (object_class, + PROP_LOCK_HINT, + g_param_spec_boolean ("lock-hint", + "lock-hint", + "Lock hint", + FALSE, + G_PARAM_READABLE)); + + g_object_class_install_property (object_class, + PROP_HAS_GUEST_ACCOUNT_HINT, + g_param_spec_boolean ("has-guest-account-hint", + "has-guest-account-hint", + "Has guest account hint", + FALSE, + G_PARAM_READABLE)); + + g_object_class_install_property (object_class, + PROP_SELECT_USER_HINT, + g_param_spec_string ("select-user-hint", + "select-user-hint", + "Select user hint", + NULL, + G_PARAM_READABLE)); + + g_object_class_install_property (object_class, + PROP_SELECT_GUEST_HINT, + g_param_spec_boolean ("select-guest-hint", + "select-guest-hint", + "Select guest account hint", + FALSE, + G_PARAM_READABLE)); + + g_object_class_install_property (object_class, + PROP_AUTOLOGIN_USER_HINT, + g_param_spec_string ("autologin-user-hint", + "autologin-user-hint", + "Autologin user hint", + NULL, + G_PARAM_READABLE)); + + g_object_class_install_property (object_class, + PROP_AUTOLOGIN_GUEST_HINT, + g_param_spec_boolean ("autologin-guest-hint", + "autologin-guest-hint", + "Autologin guest account hint", + FALSE, + G_PARAM_READABLE)); + + g_object_class_install_property (object_class, + PROP_AUTOLOGIN_TIMEOUT_HINT, + g_param_spec_int ("autologin-timeout-hint", + "autologin-timeout-hint", + "Autologin timeout hint", + 0, G_MAXINT, 0, + G_PARAM_READABLE)); + + g_object_class_install_property (object_class, + PROP_AUTHENTICATION_USER, + g_param_spec_string ("authentication-user", + "authentication-user", + "The user being authenticated", + NULL, + G_PARAM_READABLE)); + g_object_class_install_property (object_class, + PROP_IN_AUTHENTICATION, + g_param_spec_boolean ("in-authentication", + "in-authentication", + "TRUE if a user is being authenticated", + FALSE, + G_PARAM_READABLE)); + g_object_class_install_property (object_class, + PROP_IS_AUTHENTICATED, + g_param_spec_boolean ("is-authenticated", + "is-authenticated", + "TRUE if the selected user is authenticated", + FALSE, + G_PARAM_READABLE)); + + /** + * LightDMGreeter::show-prompt: + * @greeter: A #LightDMGreeter + * @text: Prompt text + * @type: Prompt type + * + * The ::show-prompt signal gets emitted when the greeter should show a + * prompt to the user. The given text should be displayed and an input + * field for the user to provide a response. + * + * Call lightdm_greeter_respond() with the resultant input or + * lightdm_greeter_cancel_authentication() to abort the authentication. + **/ + signals[SHOW_PROMPT] = + g_signal_new ("show-prompt", + G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (LightDMGreeterClass, show_prompt), + NULL, NULL, + marshal_VOID__STRING_INT, + G_TYPE_NONE, 2, G_TYPE_STRING, G_TYPE_INT); + + /** + * LightDMGreeter::show-message: + * @greeter: A #LightDMGreeter + * @text: Message text + * @type: Message type + * + * The ::show-message signal gets emitted when the greeter + * should show a message to the user. + **/ + signals[SHOW_MESSAGE] = + g_signal_new ("show-message", + G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (LightDMGreeterClass, show_message), + NULL, NULL, + marshal_VOID__STRING_INT, + G_TYPE_NONE, 2, G_TYPE_STRING, G_TYPE_INT); + + /** + * LightDMGreeter::authentication-complete: + * @greeter: A #LightDMGreeter + * + * The ::authentication-complete signal gets emitted when the greeter + * has completed authentication. + * + * Call lightdm_greeter_get_is_authenticated() to check if the authentication + * was successful. + **/ + signals[AUTHENTICATION_COMPLETE] = + g_signal_new ("authentication-complete", + G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (LightDMGreeterClass, authentication_complete), + NULL, NULL, + g_cclosure_marshal_VOID__VOID, + G_TYPE_NONE, 0); + + /** + * LightDMGreeter::autologin-timer-expired: + * @greeter: A #LightDMGreeter + * + * The ::timed-login signal gets emitted when the automatic login timer has expired. + * The application should then call lightdm_greeter_login(). + **/ + signals[AUTOLOGIN_TIMER_EXPIRED] = + g_signal_new ("autologin-timer-expired", + G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (LightDMGreeterClass, autologin_timer_expired), + NULL, NULL, + g_cclosure_marshal_VOID__VOID, + G_TYPE_NONE, 0); +} |