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glib/gio/tests/gdbus-server-auth.c
Simon McVittie 2b1e706b2f gdbus-server-auth test: Create temporary directory for Unix socket 
This avoids failure to listen on the given address on non-Linux Unix
kernels, where abstract sockets do not exist and so unix:tmpdir is
equivalent to unix:dir.

To avoid bugs like this one recurring, run most of these tests using
the unix:dir address type, where Linux is equivalent to other Unix
kernels; just do one unix:tmpdir test, to check that we still
interoperate with libdbus when using abstract sockets on Linux.

Resolves: GNOME/glib#1920
Fixes: 9f962ebe "Add a test for GDBusServer authentication"
Signed-off-by: Simon McVittie <smcv@collabora.com>
2019-10-29 16:36:19 +00:00

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/*
* Copyright 2019 Collabora Ltd.
*
* 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 2.1 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <errno.h>
#include <glib/gstdio.h>
#include <gio/gio.h>
#ifdef HAVE_DBUS1
#include <dbus/dbus.h>
#endif
typedef enum
{
INTEROP_FLAGS_EXTERNAL = (1 << 0),
INTEROP_FLAGS_ANONYMOUS = (1 << 1),
INTEROP_FLAGS_SHA1 = (1 << 2),
INTEROP_FLAGS_TCP = (1 << 3),
INTEROP_FLAGS_LIBDBUS = (1 << 4),
INTEROP_FLAGS_ABSTRACT = (1 << 5),
INTEROP_FLAGS_NONE = 0
} InteropFlags;
static gboolean
allow_external_cb (G_GNUC_UNUSED GDBusAuthObserver *observer,
const char *mechanism,
G_GNUC_UNUSED gpointer user_data)
{
if (g_strcmp0 (mechanism, "EXTERNAL") == 0)
{
g_debug ("Accepting EXTERNAL authentication");
return TRUE;
}
else
{
g_debug ("Rejecting \"%s\" authentication: not EXTERNAL", mechanism);
return FALSE;
}
}
static gboolean
allow_anonymous_cb (G_GNUC_UNUSED GDBusAuthObserver *observer,
const char *mechanism,
G_GNUC_UNUSED gpointer user_data)
{
if (g_strcmp0 (mechanism, "ANONYMOUS") == 0)
{
g_debug ("Accepting ANONYMOUS authentication");
return TRUE;
}
else
{
g_debug ("Rejecting \"%s\" authentication: not ANONYMOUS", mechanism);
return FALSE;
}
}
static gboolean
allow_sha1_cb (G_GNUC_UNUSED GDBusAuthObserver *observer,
const char *mechanism,
G_GNUC_UNUSED gpointer user_data)
{
if (g_strcmp0 (mechanism, "DBUS_COOKIE_SHA1") == 0)
{
g_debug ("Accepting DBUS_COOKIE_SHA1 authentication");
return TRUE;
}
else
{
g_debug ("Rejecting \"%s\" authentication: not DBUS_COOKIE_SHA1",
mechanism);
return FALSE;
}
}
static gboolean
allow_any_mechanism_cb (G_GNUC_UNUSED GDBusAuthObserver *observer,
const char *mechanism,
G_GNUC_UNUSED gpointer user_data)
{
g_debug ("Accepting \"%s\" authentication", mechanism);
return TRUE;
}
static gboolean
authorize_any_authenticated_peer_cb (G_GNUC_UNUSED GDBusAuthObserver *observer,
G_GNUC_UNUSED GIOStream *stream,
GCredentials *credentials,
G_GNUC_UNUSED gpointer user_data)
{
if (credentials == NULL)
{
g_debug ("Authorizing peer with no credentials");
}
else
{
gchar *str = g_credentials_to_string (credentials);
g_debug ("Authorizing peer with credentials: %s", str);
g_free (str);
}
return TRUE;
}
static GDBusMessage *
whoami_filter_cb (GDBusConnection *connection,
GDBusMessage *message,
gboolean incoming,
G_GNUC_UNUSED gpointer user_data)
{
if (!incoming)
return message;
if (g_dbus_message_get_message_type (message) == G_DBUS_MESSAGE_TYPE_METHOD_CALL &&
g_strcmp0 (g_dbus_message_get_member (message), "WhoAmI") == 0)
{
GDBusMessage *reply = g_dbus_message_new_method_reply (message);
gint64 uid = -1;
gint64 pid = -1;
#ifdef G_OS_UNIX
GCredentials *credentials = g_dbus_connection_get_peer_credentials (connection);
if (credentials != NULL)
{
uid = (gint64) g_credentials_get_unix_user (credentials, NULL);
pid = (gint64) g_credentials_get_unix_pid (credentials, NULL);
}
#endif
g_dbus_message_set_body (reply,
g_variant_new ("(xx)", uid, pid));
g_dbus_connection_send_message (connection, reply,
G_DBUS_SEND_MESSAGE_FLAGS_NONE,
NULL, NULL);
/* handled */
g_object_unref (message);
return NULL;
}
return message;
}
static gboolean
new_connection_cb (G_GNUC_UNUSED GDBusServer *server,
GDBusConnection *connection,
G_GNUC_UNUSED gpointer user_data)
{
GCredentials *credentials = g_dbus_connection_get_peer_credentials (connection);
if (credentials == NULL)
{
g_debug ("New connection from peer with no credentials");
}
else
{
gchar *str = g_credentials_to_string (credentials);
g_debug ("New connection from peer with credentials: %s", str);
g_free (str);
}
g_object_ref (connection);
g_dbus_connection_add_filter (connection, whoami_filter_cb, NULL, NULL);
return TRUE;
}
#ifdef HAVE_DBUS1
typedef struct
{
DBusError error;
DBusConnection *conn;
DBusMessage *call;
DBusMessage *reply;
} LibdbusCall;
static void
libdbus_call_task_cb (GTask *task,
G_GNUC_UNUSED gpointer source_object,
gpointer task_data,
G_GNUC_UNUSED GCancellable *cancellable)
{
LibdbusCall *libdbus_call = task_data;
libdbus_call->reply = dbus_connection_send_with_reply_and_block (libdbus_call->conn,
libdbus_call->call,
-1,
&libdbus_call->error);
}
#endif /* HAVE_DBUS1 */
static void
store_result_cb (G_GNUC_UNUSED GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
GAsyncResult **result = user_data;
g_assert_nonnull (result);
g_assert_null (*result);
*result = g_object_ref (res);
}
static void
assert_expected_uid_pid (InteropFlags flags,
gint64 uid,
gint64 pid)
{
#ifdef G_OS_UNIX
if (flags & (INTEROP_FLAGS_ANONYMOUS | INTEROP_FLAGS_SHA1 | INTEROP_FLAGS_TCP))
{
/* No assertion. There is no guarantee whether credentials will be
* passed even though we didn't send them. Conversely, if
* credentials were not passed,
* g_dbus_connection_get_peer_credentials() always returns the
* credentials of the socket, and not the uid that a
* client might have proved it has by using DBUS_COOKIE_SHA1. */
}
else /* We should prefer EXTERNAL whenever it is allowed. */
{
#ifdef __linux__
/* We know that both GDBus and libdbus support full credentials-passing
* on Linux. */
g_assert_cmpint (uid, ==, getuid ());
g_assert_cmpint (pid, ==, getpid ());
#else
g_test_message ("Please open a merge request to add appropriate "
"assertions for your platform");
#endif
}
#endif /* G_OS_UNIX */
}
static void
do_test_server_auth (InteropFlags flags)
{
GError *error = NULL;
gchar *tmpdir = NULL;
gchar *listenable_address = NULL;
GDBusServer *server = NULL;
GDBusAuthObserver *observer = NULL;
GDBusServerFlags server_flags = G_DBUS_SERVER_FLAGS_RUN_IN_THREAD;
gchar *guid = NULL;
const char *connectable_address;
GDBusConnection *client = NULL;
GAsyncResult *result = NULL;
GVariant *tuple = NULL;
gint64 uid, pid;
#ifdef HAVE_DBUS1
/* GNOME/glib#1831 seems to involve a race condition, so try a few times
* to see if we can trigger it. */
gsize i;
gsize n = 20;
#endif
if (flags & INTEROP_FLAGS_TCP)
{
listenable_address = g_strdup ("tcp:host=127.0.0.1");
}
else
{
#ifdef G_OS_UNIX
gchar *escaped;
tmpdir = g_dir_make_tmp ("gdbus-server-auth-XXXXXX", &error);
g_assert_no_error (error);
escaped = g_dbus_address_escape_value (tmpdir);
listenable_address = g_strdup_printf ("unix:%s=%s",
(flags & INTEROP_FLAGS_ABSTRACT) ? "tmpdir" : "dir",
escaped);
g_free (escaped);
#else
g_test_skip ("unix: addresses only work on Unix");
goto out;
#endif
}
g_test_message ("Testing GDBus server at %s / libdbus client, with flags: "
"external:%s "
"anonymous:%s "
"sha1:%s "
"abstract:%s "
"tcp:%s",
listenable_address,
(flags & INTEROP_FLAGS_EXTERNAL) ? "true" : "false",
(flags & INTEROP_FLAGS_ANONYMOUS) ? "true" : "false",
(flags & INTEROP_FLAGS_SHA1) ? "true" : "false",
(flags & INTEROP_FLAGS_ABSTRACT) ? "true" : "false",
(flags & INTEROP_FLAGS_TCP) ? "true" : "false");
#if !defined(G_CREDENTIALS_UNIX_CREDENTIALS_MESSAGE_SUPPORTED) \
&& !defined(G_CREDENTIALS_SOCKET_GET_CREDENTIALS_SUPPORTED)
if (flags & INTEROP_FLAGS_EXTERNAL)
{
g_test_skip ("EXTERNAL authentication not implemented on this platform");
goto out;
}
#endif
if (flags & INTEROP_FLAGS_ANONYMOUS)
server_flags |= G_DBUS_SERVER_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS;
observer = g_dbus_auth_observer_new ();
if (flags & INTEROP_FLAGS_EXTERNAL)
g_signal_connect (observer, "allow-mechanism",
G_CALLBACK (allow_external_cb), NULL);
else if (flags & INTEROP_FLAGS_ANONYMOUS)
g_signal_connect (observer, "allow-mechanism",
G_CALLBACK (allow_anonymous_cb), NULL);
else if (flags & INTEROP_FLAGS_SHA1)
g_signal_connect (observer, "allow-mechanism",
G_CALLBACK (allow_sha1_cb), NULL);
else
g_signal_connect (observer, "allow-mechanism",
G_CALLBACK (allow_any_mechanism_cb), NULL);
g_signal_connect (observer, "authorize-authenticated-peer",
G_CALLBACK (authorize_any_authenticated_peer_cb),
NULL);
guid = g_dbus_generate_guid ();
server = g_dbus_server_new_sync (listenable_address,
server_flags,
guid,
observer,
NULL,
&error);
g_assert_no_error (error);
g_assert_nonnull (server);
g_signal_connect (server, "new-connection", G_CALLBACK (new_connection_cb), NULL);
g_dbus_server_start (server);
connectable_address = g_dbus_server_get_client_address (server);
g_test_message ("Connectable address: %s", connectable_address);
result = NULL;
g_dbus_connection_new_for_address (connectable_address,
G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT,
NULL, NULL, store_result_cb, &result);
while (result == NULL)
g_main_context_iteration (NULL, TRUE);
client = g_dbus_connection_new_for_address_finish (result, &error);
g_assert_no_error (error);
g_assert_nonnull (client);
g_clear_object (&result);
g_dbus_connection_call (client, NULL, "/", "com.example.Test", "WhoAmI",
NULL, G_VARIANT_TYPE ("(xx)"),
G_DBUS_CALL_FLAGS_NONE, -1, NULL, store_result_cb,
&result);
while (result == NULL)
g_main_context_iteration (NULL, TRUE);
tuple = g_dbus_connection_call_finish (client, result, &error);
g_assert_no_error (error);
g_assert_nonnull (tuple);
g_clear_object (&result);
g_clear_object (&client);
uid = -2;
pid = -2;
g_variant_get (tuple, "(xx)", &uid, &pid);
g_debug ("Server says GDBus client is uid %" G_GINT64_FORMAT ", pid %" G_GINT64_FORMAT,
uid, pid);
assert_expected_uid_pid (flags, uid, pid);
g_clear_pointer (&tuple, g_variant_unref);
#ifdef HAVE_DBUS1
for (i = 0; i < n; i++)
{
LibdbusCall libdbus_call = { DBUS_ERROR_INIT, NULL, NULL, NULL };
GTask *task;
libdbus_call.conn = dbus_connection_open_private (connectable_address,
&libdbus_call.error);
g_assert_cmpstr (libdbus_call.error.name, ==, NULL);
g_assert_nonnull (libdbus_call.conn);
libdbus_call.call = dbus_message_new_method_call (NULL, "/",
"com.example.Test",
"WhoAmI");
if (libdbus_call.call == NULL)
g_error ("Out of memory");
result = NULL;
task = g_task_new (NULL, NULL, store_result_cb, &result);
g_task_set_task_data (task, &libdbus_call, NULL);
g_task_run_in_thread (task, libdbus_call_task_cb);
while (result == NULL)
g_main_context_iteration (NULL, TRUE);
g_clear_object (&result);
g_assert_cmpstr (libdbus_call.error.name, ==, NULL);
g_assert_nonnull (libdbus_call.reply);
uid = -2;
pid = -2;
dbus_message_get_args (libdbus_call.reply, &libdbus_call.error,
DBUS_TYPE_INT64, &uid,
DBUS_TYPE_INT64, &pid,
DBUS_TYPE_INVALID);
g_assert_cmpstr (libdbus_call.error.name, ==, NULL);
g_debug ("Server says libdbus client %" G_GSIZE_FORMAT " is uid %" G_GINT64_FORMAT ", pid %" G_GINT64_FORMAT,
i, uid, pid);
assert_expected_uid_pid (flags | INTEROP_FLAGS_LIBDBUS, uid, pid);
dbus_connection_close (libdbus_call.conn);
dbus_connection_unref (libdbus_call.conn);
dbus_message_unref (libdbus_call.call);
dbus_message_unref (libdbus_call.reply);
g_clear_object (&task);
}
#else /* !HAVE_DBUS1 */
g_test_skip ("Testing interop with libdbus not supported");
#endif /* !HAVE_DBUS1 */
out:
if (server != NULL)
g_dbus_server_stop (server);
if (tmpdir != NULL)
g_assert_cmpstr (g_rmdir (tmpdir) == 0 ? "OK" : g_strerror (errno),
==, "OK");
g_clear_object (&server);
g_clear_object (&observer);
g_free (guid);
g_free (listenable_address);
g_free (tmpdir);
}
static void
test_server_auth (void)
{
do_test_server_auth (INTEROP_FLAGS_NONE);
}
static void
test_server_auth_abstract (void)
{
do_test_server_auth (INTEROP_FLAGS_ABSTRACT);
}
static void
test_server_auth_tcp (void)
{
do_test_server_auth (INTEROP_FLAGS_TCP);
}
static void
test_server_auth_anonymous (void)
{
do_test_server_auth (INTEROP_FLAGS_ANONYMOUS);
}
static void
test_server_auth_anonymous_tcp (void)
{
do_test_server_auth (INTEROP_FLAGS_ANONYMOUS | INTEROP_FLAGS_TCP);
}
static void
test_server_auth_external (void)
{
do_test_server_auth (INTEROP_FLAGS_EXTERNAL);
}
static void
test_server_auth_sha1 (void)
{
do_test_server_auth (INTEROP_FLAGS_SHA1);
}
static void
test_server_auth_sha1_tcp (void)
{
do_test_server_auth (INTEROP_FLAGS_SHA1 | INTEROP_FLAGS_TCP);
}
int
main (int argc,
char *argv[])
{
g_test_init (&argc, &argv, NULL);
g_test_add_func ("/gdbus/server-auth", test_server_auth);
g_test_add_func ("/gdbus/server-auth/abstract", test_server_auth_abstract);
g_test_add_func ("/gdbus/server-auth/tcp", test_server_auth_tcp);
g_test_add_func ("/gdbus/server-auth/anonymous", test_server_auth_anonymous);
g_test_add_func ("/gdbus/server-auth/anonymous/tcp", test_server_auth_anonymous_tcp);
g_test_add_func ("/gdbus/server-auth/external", test_server_auth_external);
g_test_add_func ("/gdbus/server-auth/sha1", test_server_auth_sha1);
g_test_add_func ("/gdbus/server-auth/sha1/tcp", test_server_auth_sha1_tcp);
return g_test_run();
}
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