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flatpak-builder/xdg-app-run.c

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/*
* Copyright © 2014 Red Hat, Inc
*
* This program 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, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include <string.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <gio/gio.h>
#include "libgsystem.h"
#include "libglnx/libglnx.h"
#include "xdg-app-run.h"
#include "xdg-app-utils.h"
#include "xdg-app-systemd-dbus.h"
gboolean
xdg_app_run_verify_environment_keys (const char **keys,
GError **error)
{
const char *key;
const char *environment_keys[] = {
"x11", "wayland", "ipc", "pulseaudio", "system-dbus", "session-dbus",
"network", "host-fs", "homedir", "dri", NULL
};
if (keys == NULL)
return TRUE;
if ((key = g_strv_subset (environment_keys, keys)) != NULL)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Unknown Environment key %s", key);
return FALSE;
}
return TRUE;
}
static char *
extract_unix_path_from_dbus_address (const char *address)
{
const char *path, *path_end;
if (address == NULL)
return NULL;
if (!g_str_has_prefix (address, "unix:"))
return NULL;
path = strstr (address, "path=");
if (path == NULL)
return NULL;
path += strlen ("path=");
path_end = path;
while (*path_end != 0 && *path_end != ',')
path_end++;
return g_strndup (path, path_end - path);
}
void
xdg_app_run_add_x11_args (GPtrArray *argv_array)
{
char *x11_socket = NULL;
const char *display = g_getenv ("DISPLAY");
if (display && display[0] == ':' && g_ascii_isdigit (display[1]))
{
const char *display_nr = &display[1];
const char *display_nr_end = display_nr;
g_autofree char *d = NULL;
while (g_ascii_isdigit (*display_nr_end))
display_nr_end++;
d = g_strndup (display_nr, display_nr_end - display_nr);
x11_socket = g_strdup_printf ("/tmp/.X11-unix/X%s", d);
g_ptr_array_add (argv_array, g_strdup ("-x"));
g_ptr_array_add (argv_array, x11_socket);
}
}
void
xdg_app_run_add_wayland_args (GPtrArray *argv_array)
{
char *wayland_socket = g_build_filename (g_get_user_runtime_dir (), "wayland-0", NULL);
if (g_file_test (wayland_socket, G_FILE_TEST_EXISTS))
{
g_ptr_array_add (argv_array, g_strdup ("-y"));
g_ptr_array_add (argv_array, wayland_socket);
}
else
g_free (wayland_socket);
}
void
xdg_app_run_add_pulseaudio_args (GPtrArray *argv_array)
{
char *pulseaudio_socket = g_build_filename (g_get_user_runtime_dir (), "pulse/native", NULL);
if (g_file_test (pulseaudio_socket, G_FILE_TEST_EXISTS))
{
g_ptr_array_add (argv_array, g_strdup ("-p"));
g_ptr_array_add (argv_array, pulseaudio_socket);
}
}
void
xdg_app_run_add_system_dbus_args (GPtrArray *argv_array)
{
const char *dbus_address = g_getenv ("DBUS_SYSTEM_BUS_ADDRESS");
char *dbus_system_socket = NULL;
dbus_system_socket = extract_unix_path_from_dbus_address (dbus_address);
if (dbus_system_socket == NULL &&
g_file_test ("/var/run/dbus/system_bus_socket", G_FILE_TEST_EXISTS))
{
dbus_system_socket = g_strdup ("/var/run/dbus/system_bus_socket");
}
if (dbus_system_socket != NULL)
{
g_ptr_array_add (argv_array, g_strdup ("-D"));
g_ptr_array_add (argv_array, dbus_system_socket);
}
}
void
xdg_app_run_add_session_dbus_args (GPtrArray *argv_array)
{
const char *dbus_address = g_getenv ("DBUS_SESSION_BUS_ADDRESS");
char *dbus_session_socket = NULL;
dbus_session_socket = extract_unix_path_from_dbus_address (dbus_address);
if (dbus_session_socket != NULL)
{
g_ptr_array_add (argv_array, g_strdup ("-d"));
g_ptr_array_add (argv_array, dbus_session_socket);
}
}
void
xdg_app_run_add_environment_args (GPtrArray *argv_array,
GKeyFile *metakey,
const char **allow,
const char **forbid)
{
const char *no_opts[1] = { NULL };
char opts[16];
int i;
i = 0;
opts[i++] = '-';
if (allow == NULL)
allow = no_opts;
if (forbid == NULL)
forbid = no_opts;
if ((g_key_file_get_boolean (metakey, "Environment", "ipc", NULL) || g_strv_contains (allow, "ipc")) &&
!g_strv_contains (forbid, "ipc"))
{
g_debug ("Allowing ipc access");
opts[i++] = 'i';
}
if ((g_key_file_get_boolean (metakey, "Environment", "dri", NULL) || g_strv_contains (allow, "dri")) &&
!g_strv_contains (forbid, "dri"))
{
g_debug ("Allowing dri access");
opts[i++] = 'g';
}
if ((g_key_file_get_boolean (metakey, "Environment", "host-fs", NULL) || g_strv_contains (allow, "nost-fs")) &&
!g_strv_contains (forbid, "host-fs"))
{
g_debug ("Allowing host-fs access");
opts[i++] = 'f';
}
if ((g_key_file_get_boolean (metakey, "Environment", "homedir", NULL) || g_strv_contains (allow, "homedir")) &&
!g_strv_contains (forbid, "homedir"))
{
g_debug ("Allowing homedir access");
opts[i++] = 'H';
}
if ((g_key_file_get_boolean (metakey, "Environment", "network", NULL) || g_strv_contains (allow, "network")) &&
!g_strv_contains (forbid, "network"))
{
g_debug ("Allowing network access");
opts[i++] = 'n';
}
if ((g_key_file_get_boolean (metakey, "Environment", "x11", NULL) || g_strv_contains (allow, "x11")) &&
!g_strv_contains (forbid, "x11"))
{
g_debug ("Allowing x11 access");
xdg_app_run_add_x11_args (argv_array);
}
if ((g_key_file_get_boolean (metakey, "Environment", "wayland", NULL) || g_strv_contains (allow, "wayland")) &&
!g_strv_contains (forbid, "wayland"))
{
g_debug ("Allowing wayland access");
xdg_app_run_add_wayland_args (argv_array);
}
if ((g_key_file_get_boolean (metakey, "Environment", "pulseaudio", NULL) || g_strv_contains (allow, "pulseaudio")) &&
!g_strv_contains (forbid, "pulseaudio"))
{
g_debug ("Allowing pulseaudio access");
xdg_app_run_add_pulseaudio_args (argv_array);
}
if ((g_key_file_get_boolean (metakey, "Environment", "system-dbus", NULL) || g_strv_contains (allow, "system-dbus")) &&
!g_strv_contains (forbid, "system-dbus"))
{
g_debug ("Allowing system-dbus access");
xdg_app_run_add_system_dbus_args (argv_array);
}
if ((g_key_file_get_boolean (metakey, "Environment", "session-dbus", NULL) || g_strv_contains (allow, "session-dbus")) &&
!g_strv_contains (forbid, "session-dbus"))
{
g_debug ("Allowing session-dbus access");
xdg_app_run_add_session_dbus_args (argv_array);
}
g_assert (sizeof(opts) > i);
if (i > 1)
{
opts[i++] = 0;
g_ptr_array_add (argv_array, g_strdup (opts));
}
}
void
xdg_app_run_setup_minimal_env (GPtrArray *env_array,
gboolean devel)
{
static const char const *exports[] = {
"XDG_DATA_DIRS=/self/share:/usr/share",
"PATH=/self/bin:/usr/bin",
"SHELL=/bin/sh",
};
static const char const *exports_devel[] = {
"ACLOCAL_PATH=/self/share/aclocal",
"C_INCLUDE_PATH=/self/include",
"CPLUS_INCLUDE_PATH=/self/include",
"GI_TYPELIB_PATH=/self/lib/girepository-1.0",
"LDFLAGS=-L/self/lib ",
"PKG_CONFIG_PATH=/self/lib/pkgconfig:/self/share/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig",
"LC_ALL=en_US.utf8",
};
static const char const *copy[] = {
"GDMSESSION",
"XDG_CURRENT_DESKTOP",
"XDG_SESSION_DESKTOP",
"DESKTOP_SESSION",
"EMAIL_ADDRESS",
"HOME",
"HOSTNAME",
"LOGNAME",
"REAL_NAME",
"TERM",
"USER",
"USERNAME",
};
static const char const *copy_nodevel[] = {
"LANG",
"LANGUAGE",
"LC_ALL",
"LC_ADDRESS",
"LC_COLLATE",
"LC_CTYPE",
"LC_IDENTIFICATION",
"LC_MEASUREMENT",
"LC_MESSAGES",
"LC_MONETARY",
"LC_NAME",
"LC_NUMERIC",
"LC_PAPER",
"LC_TELEPHONE",
"LC_TIME",
};
int i;
for (i = 0; i < G_N_ELEMENTS(exports); i++)
g_ptr_array_add (env_array, g_strdup (exports[i]));
if (devel)
{
for (i = 0; i < G_N_ELEMENTS(exports_devel); i++)
g_ptr_array_add (env_array, g_strdup (exports_devel[i]));
}
for (i = 0; i < G_N_ELEMENTS(copy); i++)
{
const char *current = g_getenv(copy[i]);
if (current)
g_ptr_array_add (env_array, g_strdup_printf ("%s=%s", copy[i], current));
}
if (!devel)
{
for (i = 0; i < G_N_ELEMENTS(copy_nodevel); i++)
{
const char *current = g_getenv(copy_nodevel[i]);
if (current)
g_ptr_array_add (env_array, g_strdup_printf ("%s=%s", copy_nodevel[i], current));
}
}
}
GFile *
xdg_app_get_data_dir (const char *app_id)
{
g_autoptr(GFile) home = g_file_new_for_path (g_get_home_dir ());
g_autoptr(GFile) var_app = g_file_resolve_relative_path (home, ".var/app");
return g_file_get_child (var_app, app_id);
}
GFile *
xdg_app_ensure_data_dir (const char *app_id,
GCancellable *cancellable,
GError **error)
{
g_autoptr(GFile) dir = xdg_app_get_data_dir (app_id);
g_autoptr(GFile) data_dir = g_file_get_child (dir, "data");
g_autoptr(GFile) cache_dir = g_file_get_child (dir, "cache");
g_autoptr(GFile) config_dir = g_file_get_child (dir, "config");
if (!gs_file_ensure_directory (data_dir, TRUE, cancellable, error))
return NULL;
if (!gs_file_ensure_directory (cache_dir, TRUE, cancellable, error))
return NULL;
if (!gs_file_ensure_directory (config_dir, TRUE, cancellable, error))
return NULL;
return g_object_ref (dir);
}
struct JobData {
char *job;
GMainLoop *main_loop;
};
static void
job_removed_cb (SystemdManager *manager,
guint32 id,
char *job,
char *unit,
char *result,
struct JobData *data)
{
if (strcmp (job, data->job) == 0)
g_main_loop_quit (data->main_loop);
}
void
xdg_app_run_in_transient_unit (const char *appid)
{
GDBusConnection *conn = NULL;
GError *error = NULL;
char *path = NULL;
char *address = NULL;
char *name = NULL;
char *job = NULL;
SystemdManager *manager = NULL;
GVariantBuilder builder;
GVariant *properties = NULL;
GVariant *aux = NULL;
guint32 pid;
GMainContext *main_context = NULL;
GMainLoop *main_loop = NULL;
struct JobData data;
path = g_strdup_printf ("/run/user/%d/systemd/private", getuid());
if (!g_file_test (path, G_FILE_TEST_EXISTS))
goto out;
main_context = g_main_context_new ();
main_loop = g_main_loop_new (main_context, FALSE);
g_main_context_push_thread_default (main_context);
address = g_strconcat ("unix:path=", path, NULL);
conn = g_dbus_connection_new_for_address_sync (address,
G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT,
NULL,
NULL, &error);
if (!conn)
{
g_warning ("Can't connect to systemd: %s\n", error->message);
goto out;
}
manager = systemd_manager_proxy_new_sync (conn,
G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES,
NULL,
"/org/freedesktop/systemd1",
NULL, &error);
if (!manager)
{
g_warning ("Can't create manager proxy: %s\n", error->message);
goto out;
}
name = g_strdup_printf ("xdg-app-%s-%d.scope", appid, getpid());
g_variant_builder_init (&builder, G_VARIANT_TYPE ("a(sv)"));
pid = getpid ();
g_variant_builder_add (&builder, "(sv)",
"PIDs",
g_variant_new_fixed_array (G_VARIANT_TYPE ("u"),
&pid, 1, sizeof (guint32))
);
properties = g_variant_builder_end (&builder);
aux = g_variant_new_array (G_VARIANT_TYPE ("(sa(sv))"), NULL, 0);
if (!systemd_manager_call_start_transient_unit_sync (manager,
name,
"fail",
properties,
aux,
&job,
NULL,
&error))
{
g_warning ("Can't start transient unit: %s\n", error->message);
goto out;
}
data.job = job;
data.main_loop = main_loop;
g_signal_connect (manager,"job-removed", G_CALLBACK (job_removed_cb), &data);
g_main_loop_run (main_loop);
out:
if (main_context)
{
g_main_context_pop_thread_default (main_context);
g_main_context_unref (main_context);
}
if (main_loop)
g_main_loop_unref (main_loop);
if (error)
g_error_free (error);
if (manager)
g_object_unref (manager);
if (conn)
g_object_unref (conn);
g_free (path);
g_free (address);
g_free (job);
g_free (name);
}
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