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/*
* Copyright (C) 2008 Red Hat, Inc.
*
* 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 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: David Zeuthen <davidz@redhat.com>
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <stdio.h>
#include "polkitsubject.h"
#include "polkitunixprocess.h"
#include "polkitunixsession.h"
#include "polkitsystembusname.h"
#include "polkiterror.h"
#include "polkitprivate.h"
/**
* SECTION:polkitsubject
* @title: PolkitSubject
* @short_description: Type for representing subjects
*
* #PolkitSubject is an abstract type for representing one or more
* processes.
*/
static void
base_init (gpointer g_iface)
{
}
GType
polkit_subject_get_type (void)
{
static volatile gsize g_define_type_id__volatile = 0;
if (g_once_init_enter (&g_define_type_id__volatile))
{
static const GTypeInfo info =
{
sizeof (PolkitSubjectIface),
base_init, /* base_init */
NULL, /* base_finalize */
NULL, /* class_init */
NULL, /* class_finalize */
NULL, /* class_data */
0, /* instance_size */
0, /* n_preallocs */
NULL, /* instance_init */
NULL /* value_table */
};
GType iface_type =
g_type_register_static (G_TYPE_INTERFACE, "PolkitSubject", &info, 0);
g_type_interface_add_prerequisite (iface_type, G_TYPE_OBJECT);
g_once_init_leave (&g_define_type_id__volatile, iface_type);
}
return g_define_type_id__volatile;
}
/**
* polkit_subject_hash:
* @subject: A #PolkitSubject.
*
* Gets a hash code for @subject that can be used with e.g. g_hash_table_new().
*
* Returns: A hash code.
*/
guint
polkit_subject_hash (PolkitSubject *subject)
{
g_return_val_if_fail (POLKIT_IS_SUBJECT (subject), 0);
return POLKIT_SUBJECT_GET_IFACE (subject)->hash (subject);
}
/**
* polkit_subject_equal:
* @a: A #PolkitSubject.
* @b: A #PolkitSubject.
*
* Checks if @a and @b are equal, ie. represent the same subject.
*
* This function can be used in e.g. g_hash_table_new().
*
* Returns: %TRUE if @a and @b are equal, %FALSE otherwise.
*/
gboolean
polkit_subject_equal (PolkitSubject *a,
PolkitSubject *b)
{
g_return_val_if_fail (POLKIT_IS_SUBJECT (a), FALSE);
g_return_val_if_fail (POLKIT_IS_SUBJECT (b), FALSE);
if (!g_type_is_a (G_TYPE_FROM_INSTANCE (a), G_TYPE_FROM_INSTANCE (b)))
return FALSE;
return POLKIT_SUBJECT_GET_IFACE (a)->equal (a, b);
}
/**
* polkit_subject_to_string:
* @subject: A #PolkitSubject.
*
* Serializes @subject to a string that can be used in
* polkit_subject_from_string().
*
* Returns: A string representing @subject. Free with g_free().
*/
gchar *
polkit_subject_to_string (PolkitSubject *subject)
{
g_return_val_if_fail (POLKIT_IS_SUBJECT (subject), NULL);
return POLKIT_SUBJECT_GET_IFACE (subject)->to_string (subject);
}
/**
* polkit_subject_exists:
* @subject: A #PolkitSubject.
* @cancellable: (allow-none): A #GCancellable or %NULL.
* @callback: A #GAsyncReadyCallback to call when the request is satisfied
* @user_data: The data to pass to @callback.
*
* Asynchronously checks if @subject exists.
*
* When the operation is finished, @callback will be invoked in the
* <link linkend="g-main-context-push-thread-default">thread-default
* main loop</link> of the thread you are calling this method
* from. You can then call polkit_subject_exists_finish() to get the
* result of the operation.
**/
void
polkit_subject_exists (PolkitSubject *subject,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
g_return_if_fail (POLKIT_IS_SUBJECT (subject));
g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));
POLKIT_SUBJECT_GET_IFACE (subject)->exists (subject,
cancellable,
callback,
user_data);
}
/**
* polkit_subject_exists_finish:
* @subject: A #PolkitSubject.
* @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to polkit_subject_exists().
* @error: (allow-none): Return location for error or %NULL.
*
* Finishes checking whether a subject exists.
*
* Returns: %TRUE if the subject exists, %FALSE if not or @error is set.
*/
gboolean
polkit_subject_exists_finish (PolkitSubject *subject,
GAsyncResult *res,
GError **error)
{
g_return_val_if_fail (POLKIT_IS_SUBJECT (subject), FALSE);
g_return_val_if_fail (G_IS_ASYNC_RESULT (res), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
return POLKIT_SUBJECT_GET_IFACE (subject)->exists_finish (subject,
res,
error);
}
/**
* polkit_subject_exists_sync:
* @subject: A #PolkitSubject.
* @cancellable: (allow-none): A #GCancellable or %NULL.
* @error: (allow-none): Return location for error or %NULL.
*
* Checks if @subject exists.
*
* This is a synchronous blocking call - the calling thread is blocked
* until a reply is received. See polkit_subject_exists() for the
* asynchronous version.
*
* Returns: %TRUE if the subject exists, %FALSE if not or @error is set.
*/
gboolean
polkit_subject_exists_sync (PolkitSubject *subject,
GCancellable *cancellable,
GError **error)
{
g_return_val_if_fail (POLKIT_IS_SUBJECT (subject), FALSE);
g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
return POLKIT_SUBJECT_GET_IFACE (subject)->exists_sync (subject,
cancellable,
error);
}
/**
* polkit_subject_from_string:
* @str: A string obtained from polkit_subject_to_string().
* @error: (allow-none): Return location for error or %NULL.
*
* Creates an object from @str that implements the #PolkitSubject
* interface.
*
* Returns: (transfer full): A #PolkitSubject or %NULL if @error is
* set. Free with g_object_unref().
*/
PolkitSubject *
polkit_subject_from_string (const gchar *str,
GError **error)
{
PolkitSubject *subject;
g_return_val_if_fail (str != NULL, NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
/* TODO: we could do something with VFuncs like in g_icon_from_string() */
subject = NULL;
if (g_str_has_prefix (str, "unix-process:"))
{
gint scanned_pid;
guint64 scanned_starttime;
gint scanned_uid;
if (sscanf (str, "unix-process:%d:%" G_GUINT64_FORMAT ":%d", &scanned_pid, &scanned_starttime, &scanned_uid) == 3)
{
subject = polkit_unix_process_new_for_owner (scanned_pid, scanned_starttime, scanned_uid);
}
else if (sscanf (str, "unix-process:%d:%" G_GUINT64_FORMAT, &scanned_pid, &scanned_starttime) == 2)
{
subject = polkit_unix_process_new_full (scanned_pid, scanned_starttime);
}
else if (sscanf (str, "unix-process:%d", &scanned_pid) == 1)
{
subject = polkit_unix_process_new (scanned_pid);
if (polkit_unix_process_get_start_time (POLKIT_UNIX_PROCESS (subject)) == 0)
{
g_object_unref (subject);
subject = NULL;
g_set_error (error,
POLKIT_ERROR,
POLKIT_ERROR_FAILED,
"Unable to determine start time for process with pid %d",
scanned_pid);
}
}
}
else if (g_str_has_prefix (str, "unix-session:"))
{
subject = polkit_unix_session_new (str + sizeof "unix-session:" - 1);
}
else if (g_str_has_prefix (str, "system-bus-name:"))
{
subject = polkit_system_bus_name_new (str + sizeof "system-bus-name:" - 1);
}
if (subject == NULL && (error != NULL && *error == NULL))
{
g_set_error (error,
POLKIT_ERROR,
POLKIT_ERROR_FAILED,
"Malformed subject string `%s'",
str);
}
return subject;
}
GVariant *
polkit_subject_to_gvariant (PolkitSubject *subject)
{
GVariantBuilder builder;
GVariant *dict;
GVariant *ret;
const gchar *kind;
kind = "";
g_variant_builder_init (&builder, G_VARIANT_TYPE ("a{sv}"));
if (POLKIT_IS_UNIX_PROCESS (subject))
{
kind = "unix-process";
g_variant_builder_add (&builder, "{sv}", "pid",
g_variant_new_uint32 (polkit_unix_process_get_pid (POLKIT_UNIX_PROCESS (subject))));
g_variant_builder_add (&builder, "{sv}", "start-time",
g_variant_new_uint64 (polkit_unix_process_get_start_time (POLKIT_UNIX_PROCESS (subject))));
g_variant_builder_add (&builder, "{sv}", "uid",
g_variant_new_int32 (polkit_unix_process_get_uid (POLKIT_UNIX_PROCESS (subject))));
}
else if (POLKIT_IS_UNIX_SESSION (subject))
{
kind = "unix-session";
g_variant_builder_add (&builder, "{sv}", "session-id",
g_variant_new_string (polkit_unix_session_get_session_id (POLKIT_UNIX_SESSION (subject))));
}
else if (POLKIT_IS_SYSTEM_BUS_NAME (subject))
{
kind = "system-bus-name";
g_variant_builder_add (&builder, "{sv}", "name",
g_variant_new_string (polkit_system_bus_name_get_name (POLKIT_SYSTEM_BUS_NAME (subject))));
}
else
{
g_warning ("Unknown class %s implementing PolkitSubject", g_type_name (G_TYPE_FROM_INSTANCE (subject)));
}
dict = g_variant_builder_end (&builder);
ret = g_variant_new ("(s@a{sv})", kind, dict);
return ret;
}
static GVariant *
lookup_asv (GVariant *dict,
const gchar *given_key,
const GVariantType *given_type,
GError **error)
{
GVariantIter iter;
const gchar *key;
GVariant *value;
GVariant *ret;
ret = NULL;
g_variant_iter_init (&iter, dict);
while (g_variant_iter_next (&iter, "{&sv}", &key, &value))
{
if (g_strcmp0 (key, given_key) == 0)
{
if (!g_variant_is_of_type (value, given_type))
{
gchar *type_string;
type_string = g_variant_type_dup_string (given_type);
g_set_error (error,
POLKIT_ERROR,
POLKIT_ERROR_FAILED,
"Value for key `%s' found but is of type %s and type %s was expected",
given_key,
g_variant_get_type_string (value),
type_string);
g_free (type_string);
goto out;
}
ret = value;
goto out;
}
g_variant_unref (value);
}
out:
if (ret == NULL)
{
gchar *type_string;
type_string = g_variant_type_dup_string (given_type);
g_set_error (error,
POLKIT_ERROR,
POLKIT_ERROR_FAILED,
"Didn't find value for key `%s' of type %s",
given_key,
type_string);
g_free (type_string);
}
return ret;
}
PolkitSubject *
polkit_subject_new_for_gvariant (GVariant *variant,
GError **error)
{
PolkitSubject *ret;
const gchar *kind;
GVariant *details_gvariant;
ret = NULL;
g_variant_get (variant,
"(&s@a{sv})",
&kind,
&details_gvariant);
if (g_strcmp0 (kind, "unix-process") == 0)
{
GVariant *v;
guint32 pid;
guint64 start_time;
gint32 uid;
v = lookup_asv (details_gvariant, "pid", G_VARIANT_TYPE_UINT32, error);
if (v == NULL)
{
g_prefix_error (error, "Error parsing unix-process subject: ");
goto out;
}
pid = g_variant_get_uint32 (v);
g_variant_unref (v);
v = lookup_asv (details_gvariant, "start-time", G_VARIANT_TYPE_UINT64, error);
if (v == NULL)
{
g_prefix_error (error, "Error parsing unix-process subject: ");
goto out;
}
start_time = g_variant_get_uint64 (v);
g_variant_unref (v);
v = lookup_asv (details_gvariant, "uid", G_VARIANT_TYPE_INT32, NULL);
if (v != NULL)
{
uid = g_variant_get_int32 (v);
g_variant_unref (v);
}
else
{
uid = -1;
}
ret = polkit_unix_process_new_for_owner (pid, start_time, uid);
}
else if (g_strcmp0 (kind, "unix-session") == 0)
{
GVariant *v;
const gchar *session_id;
v = lookup_asv (details_gvariant, "session-id", G_VARIANT_TYPE_STRING, error);
if (v == NULL)
{
g_prefix_error (error, "Error parsing unix-session subject: ");
goto out;
}
session_id = g_variant_get_string (v, NULL);
ret = polkit_unix_session_new (session_id);
g_variant_unref (v);
}
else if (g_strcmp0 (kind, "system-bus-name") == 0)
{
GVariant *v;
const gchar *name;
v = lookup_asv (details_gvariant, "name", G_VARIANT_TYPE_STRING, error);
if (v == NULL)
{
g_prefix_error (error, "Error parsing system-bus-name subject: ");
goto out;
}
name = g_variant_get_string (v, NULL);
if (!g_dbus_is_unique_name (name))
{
g_set_error (error,
POLKIT_ERROR,
POLKIT_ERROR_FAILED,
"Error parsing system-bus-name subject: `%s' is not a valid unique name",
name);
goto out;
}
ret = polkit_system_bus_name_new (name);
g_variant_unref (v);
}
else
{
g_set_error (error,
POLKIT_ERROR,
POLKIT_ERROR_FAILED,
"Unknown subject of kind `%s'",
kind);
}
out:
g_variant_unref (details_gvariant);
return ret;
}
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