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flatpak-run.c
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flatpak-run.c
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/*
* Copyright © 2014-2019 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 2.1 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/>.
*
* Authors:
* Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <gio/gdesktopappinfo.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/utsname.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/vfs.h>
#include <sys/wait.h>
#include <sys/personality.h>
#include <grp.h>
#include <unistd.h>
#include <gio/gunixfdlist.h>
#ifdef HAVE_DCONF
#include <dconf/dconf.h>
#endif
#ifdef HAVE_LIBMALCONTENT
#include <libmalcontent/malcontent.h>
#endif
#include "flatpak-syscalls-private.h"
#ifdef ENABLE_SECCOMP
#include <seccomp.h>
#endif
#ifdef ENABLE_XAUTH
#include <X11/Xauth.h>
#endif
#include <glib/gi18n-lib.h>
#include <gio/gio.h>
#include "libglnx/libglnx.h"
#include "flatpak-run-private.h"
#include "flatpak-proxy.h"
#include "flatpak-utils-base-private.h"
#include "flatpak-dir-private.h"
#include "flatpak-instance-private.h"
#include "flatpak-systemd-dbus-generated.h"
#include "flatpak-document-dbus-generated.h"
#include "flatpak-error.h"
#include "session-helper/flatpak-session-helper.h"
#define DEFAULT_SHELL "/bin/sh"
const char * const abs_usrmerged_dirs[] =
{
"/bin",
"/lib",
"/lib32",
"/lib64",
"/sbin",
NULL
};
const char * const *flatpak_abs_usrmerged_dirs = abs_usrmerged_dirs;
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);
}
#ifdef ENABLE_XAUTH
static gboolean
auth_streq (char *str,
char *au_str,
int au_len)
{
return au_len == strlen (str) && memcmp (str, au_str, au_len) == 0;
}
static gboolean
xauth_entry_should_propagate (Xauth *xa,
char *hostname,
char *number)
{
/* ensure entry isn't for remote access */
if (xa->family != FamilyLocal && xa->family != FamilyWild)
return FALSE;
/* ensure entry is for this machine */
if (xa->family == FamilyLocal && !auth_streq (hostname, xa->address, xa->address_length))
{
/* OpenSUSE inherits the hostname value from DHCP without updating
* its X11 authentication cookie. The old hostname value can still
* be found in the environment variable XAUTHLOCALHOSTNAME.
* For reference:
* https://bugzilla.opensuse.org/show_bug.cgi?id=262309
* For this reason if we have a cookie whose address is equal to the
* variable XAUTHLOCALHOSTNAME, we still need to propagate it, but
* we also need to change its address to `unames.nodename`.
*/
const char *xauth_local_hostname;
xauth_local_hostname = g_getenv ("XAUTHLOCALHOSTNAME");
if (xauth_local_hostname == NULL)
return FALSE;
if (!auth_streq ((char *) xauth_local_hostname, xa->address, xa->address_length))
return FALSE;
}
/* ensure entry is for this session */
if (xa->number != NULL && !auth_streq (number, xa->number, xa->number_length))
return FALSE;
return TRUE;
}
static void
write_xauth (char *number, FILE *output)
{
Xauth *xa, local_xa;
char *filename;
FILE *f;
struct utsname unames;
if (uname (&unames))
{
g_warning ("uname failed");
return;
}
filename = XauFileName ();
f = fopen (filename, "rb");
if (f == NULL)
return;
while (TRUE)
{
xa = XauReadAuth (f);
if (xa == NULL)
break;
if (xauth_entry_should_propagate (xa, unames.nodename, number))
{
local_xa = *xa;
if (local_xa.number)
{
local_xa.number = "99";
local_xa.number_length = 2;
}
if (local_xa.family == FamilyLocal &&
!auth_streq (unames.nodename, local_xa.address, local_xa.address_length))
{
/* If we decided to propagate this cookie, but its address
* doesn't match `unames.nodename`, we need to change it or
* inside the container it will not work.
*/
local_xa.address = unames.nodename;
local_xa.address_length = strlen (local_xa.address);
}
if (!XauWriteAuth (output, &local_xa))
g_warning ("xauth write error");
}
XauDisposeAuth (xa);
}
fclose (f);
}
#endif /* ENABLE_XAUTH */
static void
flatpak_run_add_x11_args (FlatpakBwrap *bwrap,
gboolean allowed)
{
g_autofree char *x11_socket = NULL;
const char *display;
/* Always cover /tmp/.X11-unix, that way we never see the host one in case
* we have access to the host /tmp. If you request X access we'll put the right
* thing in this anyway.
*
* We need to be a bit careful here, because there are two situations in
* which potentially hostile processes have access to /tmp and could
* create symlinks, which in principle could cause us to create the
* directory and mount the tmpfs at the target of the symlink instead
* of in the intended place:
*
* - With --filesystem=/tmp, it's the host /tmp - but because of the
* special historical status of /tmp/.X11-unix, we can assume that
* it is pre-created by the host system before user code gets to run.
*
* - When /tmp is shared between all instances of the same app ID,
* in principle the app has control over what's in /tmp, but in
* practice it can't interfere with /tmp/.X11-unix, because we do
* this unconditionally - therefore by the time app code runs,
* /tmp/.X11-unix is already a mount point, meaning the app cannot
* rename or delete it.
*/
flatpak_bwrap_add_args (bwrap,
"--tmpfs", "/tmp/.X11-unix",
NULL);
if (!allowed)
{
flatpak_bwrap_unset_env (bwrap, "DISPLAY");
return;
}
g_debug ("Allowing x11 access");
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);
flatpak_bwrap_add_args (bwrap,
"--ro-bind", x11_socket, "/tmp/.X11-unix/X99",
NULL);
flatpak_bwrap_set_env (bwrap, "DISPLAY", ":99.0", TRUE);
#ifdef ENABLE_XAUTH
g_auto(GLnxTmpfile) xauth_tmpf = { 0, };
if (glnx_open_anonymous_tmpfile_full (O_RDWR | O_CLOEXEC, "/tmp", &xauth_tmpf, NULL))
{
FILE *output = fdopen (xauth_tmpf.fd, "wb");
if (output != NULL)
{
/* fd is now owned by output, steal it from the tmpfile */
int tmp_fd = dup (glnx_steal_fd (&xauth_tmpf.fd));
if (tmp_fd != -1)
{
static const char dest[] = "/run/flatpak/Xauthority";
write_xauth (d, output);
flatpak_bwrap_add_args_data_fd (bwrap, "--ro-bind-data", tmp_fd, dest);
flatpak_bwrap_set_env (bwrap, "XAUTHORITY", dest, TRUE);
}
fclose (output);
if (tmp_fd != -1)
lseek (tmp_fd, 0, SEEK_SET);
}
}
#endif
}
else
{
flatpak_bwrap_unset_env (bwrap, "DISPLAY");
}
}
static gboolean
flatpak_run_add_wayland_args (FlatpakBwrap *bwrap)
{
const char *wayland_display;
g_autofree char *user_runtime_dir = flatpak_get_real_xdg_runtime_dir ();
g_autofree char *wayland_socket = NULL;
g_autofree char *sandbox_wayland_socket = NULL;
gboolean res = FALSE;
struct stat statbuf;
wayland_display = g_getenv ("WAYLAND_DISPLAY");
if (!wayland_display)
wayland_display = "wayland-0";
wayland_socket = g_build_filename (user_runtime_dir, wayland_display, NULL);
if (!g_str_has_prefix (wayland_display, "wayland-") ||
strchr (wayland_display, '/') != NULL)
{
wayland_display = "wayland-0";
flatpak_bwrap_set_env (bwrap, "WAYLAND_DISPLAY", wayland_display, TRUE);
}
sandbox_wayland_socket = g_strdup_printf ("/run/flatpak/%s", wayland_display);
if (stat (wayland_socket, &statbuf) == 0 &&
(statbuf.st_mode & S_IFMT) == S_IFSOCK)
{
res = TRUE;
flatpak_bwrap_add_args (bwrap,
"--ro-bind", wayland_socket, sandbox_wayland_socket,
NULL);
flatpak_bwrap_add_runtime_dir_member (bwrap, wayland_display);
}
return res;
}
static void
flatpak_run_add_ssh_args (FlatpakBwrap *bwrap)
{
static const char sandbox_auth_socket[] = "/run/flatpak/ssh-auth";
const char * auth_socket;
auth_socket = g_getenv ("SSH_AUTH_SOCK");
if (!auth_socket)
return; /* ssh agent not present */
if (!g_file_test (auth_socket, G_FILE_TEST_EXISTS))
{
/* Let's clean it up, so that the application will not try to connect */
flatpak_bwrap_unset_env (bwrap, "SSH_AUTH_SOCK");
return;
}
flatpak_bwrap_add_args (bwrap,
"--ro-bind", auth_socket, sandbox_auth_socket,
NULL);
flatpak_bwrap_set_env (bwrap, "SSH_AUTH_SOCK", sandbox_auth_socket, TRUE);
}
static void
flatpak_run_add_pcsc_args (FlatpakBwrap *bwrap)
{
const char * pcsc_socket;
const char * sandbox_pcsc_socket = "/run/pcscd/pcscd.comm";
pcsc_socket = g_getenv ("PCSCLITE_CSOCK_NAME");
if (pcsc_socket)
{
if (!g_file_test (pcsc_socket, G_FILE_TEST_EXISTS))
{
flatpak_bwrap_unset_env (bwrap, "PCSCLITE_CSOCK_NAME");
return;
}
}
else
{
pcsc_socket = "/run/pcscd/pcscd.comm";
if (!g_file_test (pcsc_socket, G_FILE_TEST_EXISTS))
return;
}
flatpak_bwrap_add_args (bwrap,
"--ro-bind", pcsc_socket, sandbox_pcsc_socket,
NULL);
flatpak_bwrap_set_env (bwrap, "PCSCLITE_CSOCK_NAME", sandbox_pcsc_socket, TRUE);
}
static gboolean
flatpak_run_cups_check_server_is_socket (const char *server)
{
if (g_str_has_prefix (server, "/") && strstr (server, ":") == NULL)
return TRUE;
return FALSE;
}
/* Try to find a default server from a cups confguration file */
static char *
flatpak_run_get_cups_server_name_config (const char *path)
{
g_autoptr(GFile) file = g_file_new_for_path (path);
g_autoptr(GError) my_error = NULL;
g_autoptr(GFileInputStream) input_stream = NULL;
g_autoptr(GDataInputStream) data_stream = NULL;
size_t len;
input_stream = g_file_read (file, NULL, &my_error);
if (my_error)
{
g_debug ("CUPS configuration file '%s': %s", path, my_error->message);
return NULL;
}
data_stream = g_data_input_stream_new (G_INPUT_STREAM (input_stream));
while (TRUE)
{
g_autofree char *line = g_data_input_stream_read_line (data_stream, &len, NULL, NULL);
if (line == NULL)
break;
g_strchug (line);
if ((*line == '\0') || (*line == '#'))
continue;
g_auto(GStrv) tokens = g_strsplit (line, " ", 2);
if ((tokens[0] != NULL) && (tokens[1] != NULL))
{
if (strcmp ("ServerName", tokens[0]) == 0)
{
g_strchug (tokens[1]);
if (flatpak_run_cups_check_server_is_socket (tokens[1]))
return g_strdup (tokens[1]);
}
}
}
return NULL;
}
static char *
flatpak_run_get_cups_server_name (void)
{
g_autofree char * cups_server = NULL;
g_autofree char * cups_config_path = NULL;
/* TODO
* we don't currently support cups servers located on the network, if such
* server is detected, we simply ignore it and in the worst case we fallback
* to the default socket
*/
cups_server = g_strdup (g_getenv ("CUPS_SERVER"));
if (cups_server && flatpak_run_cups_check_server_is_socket (cups_server))
return g_steal_pointer (&cups_server);
g_clear_pointer (&cups_server, g_free);
cups_config_path = g_build_filename (g_get_home_dir (), ".cups/client.conf", NULL);
cups_server = flatpak_run_get_cups_server_name_config (cups_config_path);
if (cups_server && flatpak_run_cups_check_server_is_socket (cups_server))
return g_steal_pointer (&cups_server);
g_clear_pointer (&cups_server, g_free);
cups_server = flatpak_run_get_cups_server_name_config ("/etc/cups/client.conf");
if (cups_server && flatpak_run_cups_check_server_is_socket (cups_server))
return g_steal_pointer (&cups_server);
// Fallback to default socket
return g_strdup ("/var/run/cups/cups.sock");
}
static void
flatpak_run_add_cups_args (FlatpakBwrap *bwrap)
{
g_autofree char * sandbox_server_name = g_strdup ("/var/run/cups/cups.sock");
g_autofree char * cups_server_name = flatpak_run_get_cups_server_name ();
if (!g_file_test (cups_server_name, G_FILE_TEST_EXISTS))
{
g_debug ("Could not find CUPS server");
return;
}
flatpak_bwrap_add_args (bwrap,
"--ro-bind", cups_server_name, sandbox_server_name,
NULL);
}
/* Try to find a default server from a pulseaudio confguration file */
static char *
flatpak_run_get_pulseaudio_server_user_config (const char *path)
{
g_autoptr(GFile) file = g_file_new_for_path (path);
g_autoptr(GError) my_error = NULL;
g_autoptr(GFileInputStream) input_stream = NULL;
g_autoptr(GDataInputStream) data_stream = NULL;
size_t len;
input_stream = g_file_read (file, NULL, &my_error);
if (my_error)
{
g_debug ("Pulseaudio user configuration file '%s': %s", path, my_error->message);
return NULL;
}
data_stream = g_data_input_stream_new (G_INPUT_STREAM (input_stream));
while (TRUE)
{
g_autofree char *line = g_data_input_stream_read_line (data_stream, &len, NULL, NULL);
if (line == NULL)
break;
g_strchug (line);
if ((*line == '\0') || (*line == ';') || (*line == '#'))
continue;
if (g_str_has_prefix (line, ".include "))
{
g_autofree char *rec_path = g_strdup (line + 9);
g_strstrip (rec_path);
char *found = flatpak_run_get_pulseaudio_server_user_config (rec_path);
if (found)
return found;
}
else if (g_str_has_prefix (line, "["))
{
return NULL;
}
else
{
g_auto(GStrv) tokens = g_strsplit (line, "=", 2);
if ((tokens[0] != NULL) && (tokens[1] != NULL))
{
g_strchomp (tokens[0]);
if (strcmp ("default-server", tokens[0]) == 0)
{
g_strstrip (tokens[1]);
g_debug ("Found pulseaudio socket from configuration file '%s': %s", path, tokens[1]);
return g_strdup (tokens[1]);
}
}
}
}
return NULL;
}
static char *
flatpak_run_get_pulseaudio_server (void)
{
const char * pulse_clientconfig;
char *pulse_server;
g_autofree char *pulse_user_config = NULL;
pulse_server = g_strdup (g_getenv ("PULSE_SERVER"));
if (pulse_server)
return pulse_server;
pulse_clientconfig = g_getenv ("PULSE_CLIENTCONFIG");
if (pulse_clientconfig)
return flatpak_run_get_pulseaudio_server_user_config (pulse_clientconfig);
pulse_user_config = g_build_filename (g_get_user_config_dir (), "pulse/client.conf", NULL);
pulse_server = flatpak_run_get_pulseaudio_server_user_config (pulse_user_config);
if (pulse_server)
return pulse_server;
pulse_server = flatpak_run_get_pulseaudio_server_user_config ("/etc/pulse/client.conf");
if (pulse_server)
return pulse_server;
return NULL;
}
/*
* Parse a PulseAudio server string, as documented on
* https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/ServerStrings/.
* Returns the first supported server address, or NULL if none are supported.
*/
static char *
flatpak_run_parse_pulse_server (const char *value)
{
g_auto(GStrv) servers = g_strsplit (value, " ", 0);
gsize i;
for (i = 0; servers[i] != NULL; i++)
{
const char *server = servers[i];
if (g_str_has_prefix (server, "{"))
{
/*
* TODO: compare the value within {} to the local hostname and D-Bus machine ID,
* and skip if it matches neither.
*/
const char * closing = strstr (server, "}");
if (closing == NULL)
continue;
server = closing + 1;
}
if (g_str_has_prefix (server, "unix:"))
return g_strdup (server + 5);
if (server[0] == '/')
return g_strdup (server);
/* TODO: Support TCP connections? */
}
return NULL;
}
/*
* Get the machine ID as used by PulseAudio. This is the systemd/D-Bus
* machine ID, or failing that, the hostname.
*/
static char *
flatpak_run_get_pulse_machine_id (void)
{
static const char * const machine_ids[] =
{
"/etc/machine-id",
"/var/lib/dbus/machine-id",
};
gsize i;
for (i = 0; i < G_N_ELEMENTS (machine_ids); i++)
{
g_autofree char *ret = NULL;
if (g_file_get_contents (machine_ids[i], &ret, NULL, NULL))
{
gsize j;
g_strstrip (ret);
for (j = 0; ret[j] != '\0'; j++)
{
if (!g_ascii_isxdigit (ret[j]))
break;
}
if (ret[0] != '\0' && ret[j] == '\0')
return g_steal_pointer (&ret);
}
}
return g_strdup (g_get_host_name ());
}
/*
* Get the directory used by PulseAudio for its configuration.
*/
static char *
flatpak_run_get_pulse_home (void)
{
/* Legacy path ~/.pulse is tried first, for compatibility */
{
const char *parent = g_get_home_dir ();
g_autofree char *ret = g_build_filename (parent, ".pulse", NULL);
if (g_file_test (ret, G_FILE_TEST_IS_DIR))
return g_steal_pointer (&ret);
}
/* The more modern path, usually ~/.config/pulse */
{
const char *parent = g_get_user_config_dir ();
/* Usually ~/.config/pulse */
g_autofree char *ret = g_build_filename (parent, "pulse", NULL);
if (g_file_test (ret, G_FILE_TEST_IS_DIR))
return g_steal_pointer (&ret);
}
return NULL;
}
/*
* Get the runtime directory used by PulseAudio for its socket.
*/
static char *
flatpak_run_get_pulse_runtime_dir (void)
{
const char *val = NULL;
val = g_getenv ("PULSE_RUNTIME_PATH");
if (val != NULL)
return realpath (val, NULL);
{
const char *user_runtime_dir = g_get_user_runtime_dir ();
if (user_runtime_dir != NULL)
{
g_autofree char *dir = g_build_filename (user_runtime_dir, "pulse", NULL);
if (g_file_test (dir, G_FILE_TEST_IS_DIR))
return realpath (dir, NULL);
}
}
{
g_autofree char *pulse_home = flatpak_run_get_pulse_home ();
g_autofree char *machine_id = flatpak_run_get_pulse_machine_id ();
if (pulse_home != NULL && machine_id != NULL)
{
/* This is usually a symlink, but we take its realpath() anyway */
g_autofree char *dir = g_strdup_printf ("%s/%s-runtime", pulse_home, machine_id);
if (g_file_test (dir, G_FILE_TEST_IS_DIR))
return realpath (dir, NULL);
}
}
return NULL;
}
static void
flatpak_run_add_pulseaudio_args (FlatpakBwrap *bwrap)
{
g_autofree char *pulseaudio_server = flatpak_run_get_pulseaudio_server ();
g_autofree char *pulseaudio_socket = NULL;
g_autofree char *pulse_runtime_dir = flatpak_run_get_pulse_runtime_dir ();
if (pulseaudio_server)
pulseaudio_socket = flatpak_run_parse_pulse_server (pulseaudio_server);
if (!pulseaudio_socket)
{
pulseaudio_socket = g_build_filename (pulse_runtime_dir, "native", NULL);
if (!g_file_test (pulseaudio_socket, G_FILE_TEST_EXISTS))
g_clear_pointer (&pulseaudio_socket, g_free);
}
if (!pulseaudio_socket)
{
pulseaudio_socket = realpath ("/var/run/pulse/native", NULL);
if (pulseaudio_socket && !g_file_test (pulseaudio_socket, G_FILE_TEST_EXISTS))
g_clear_pointer (&pulseaudio_socket, g_free);
}
flatpak_bwrap_unset_env (bwrap, "PULSE_SERVER");
if (pulseaudio_socket && g_file_test (pulseaudio_socket, G_FILE_TEST_EXISTS))
{
static const char sandbox_socket_path[] = "/run/flatpak/pulse/native";
static const char pulse_server[] = "unix:/run/flatpak/pulse/native";
static const char config_path[] = "/run/flatpak/pulse/config";
gboolean share_shm = FALSE; /* TODO: When do we add this? */
g_autofree char *client_config = g_strdup_printf ("enable-shm=%s\n", share_shm ? "yes" : "no");
/* FIXME - error handling */
if (!flatpak_bwrap_add_args_data (bwrap, "pulseaudio", client_config, -1, config_path, NULL))
return;
flatpak_bwrap_add_args (bwrap,
"--ro-bind", pulseaudio_socket, sandbox_socket_path,
NULL);
flatpak_bwrap_set_env (bwrap, "PULSE_SERVER", pulse_server, TRUE);
flatpak_bwrap_set_env (bwrap, "PULSE_CLIENTCONFIG", config_path, TRUE);
flatpak_bwrap_add_runtime_dir_member (bwrap, "pulse");
}
else
g_debug ("Could not find pulseaudio socket");
/* Also allow ALSA access. This was added in 1.8, and is not ideally named. However,
* since the practical permission of ALSA and PulseAudio are essentially the same, and
* since we don't want to add more permissions for something we plan to replace with
* portals/pipewire going forward we reinterpret pulseaudio to also mean ALSA.
*/
if (g_file_test ("/dev/snd", G_FILE_TEST_IS_DIR))
flatpak_bwrap_add_args (bwrap, "--dev-bind", "/dev/snd", "/dev/snd", NULL);
}
static void
flatpak_run_add_resolved_args (FlatpakBwrap *bwrap)
{
const char *resolved_socket = "/run/systemd/resolve/io.systemd.Resolve";
if (g_file_test (resolved_socket, G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap, "--bind", resolved_socket, resolved_socket, NULL);
}
static void
flatpak_run_add_journal_args (FlatpakBwrap *bwrap)
{
g_autofree char *journal_socket_socket = g_strdup ("/run/systemd/journal/socket");
g_autofree char *journal_stdout_socket = g_strdup ("/run/systemd/journal/stdout");
if (g_file_test (journal_socket_socket, G_FILE_TEST_EXISTS))
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", journal_socket_socket, journal_socket_socket,
NULL);
}
if (g_file_test (journal_stdout_socket, G_FILE_TEST_EXISTS))
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", journal_stdout_socket, journal_stdout_socket,
NULL);
}
}
static char *
create_proxy_socket (char *template)
{
g_autofree char *user_runtime_dir = flatpak_get_real_xdg_runtime_dir ();
g_autofree char *proxy_socket_dir = g_build_filename (user_runtime_dir, ".dbus-proxy", NULL);
g_autofree char *proxy_socket = g_build_filename (proxy_socket_dir, template, NULL);
int fd;
if (!glnx_shutil_mkdir_p_at (AT_FDCWD, proxy_socket_dir, 0755, NULL, NULL))
return NULL;
fd = g_mkstemp (proxy_socket);
if (fd == -1)
return NULL;
close (fd);
return g_steal_pointer (&proxy_socket);
}
static gboolean
flatpak_run_add_system_dbus_args (FlatpakBwrap *app_bwrap,
FlatpakBwrap *proxy_arg_bwrap,
FlatpakContext *context,
FlatpakRunFlags flags)
{
gboolean unrestricted, no_proxy;
const char *dbus_address = g_getenv ("DBUS_SYSTEM_BUS_ADDRESS");
g_autofree char *real_dbus_address = NULL;
g_autofree char *dbus_system_socket = NULL;
unrestricted = (context->sockets & FLATPAK_CONTEXT_SOCKET_SYSTEM_BUS) != 0;
if (unrestricted)
g_debug ("Allowing system-dbus access");
no_proxy = (flags & FLATPAK_RUN_FLAG_NO_SYSTEM_BUS_PROXY) != 0;
if (dbus_address != NULL)
dbus_system_socket = extract_unix_path_from_dbus_address (dbus_address);
else if (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 && unrestricted)
{
flatpak_bwrap_add_args (app_bwrap,
"--ro-bind", dbus_system_socket, "/run/dbus/system_bus_socket",
NULL);
flatpak_bwrap_set_env (app_bwrap, "DBUS_SYSTEM_BUS_ADDRESS", "unix:path=/run/dbus/system_bus_socket", TRUE);
return TRUE;
}
else if (!no_proxy && flatpak_context_get_needs_system_bus_proxy (context))
{
g_autofree char *proxy_socket = create_proxy_socket ("system-bus-proxy-XXXXXX");
if (proxy_socket == NULL)
return FALSE;
if (dbus_address)
real_dbus_address = g_strdup (dbus_address);
else
real_dbus_address = g_strdup_printf ("unix:path=%s", dbus_system_socket);
flatpak_bwrap_add_args (proxy_arg_bwrap, real_dbus_address, proxy_socket, NULL);
if (!unrestricted)
flatpak_context_add_bus_filters (context, NULL, FALSE, flags & FLATPAK_RUN_FLAG_SANDBOX, proxy_arg_bwrap);
if ((flags & FLATPAK_RUN_FLAG_LOG_SYSTEM_BUS) != 0)
flatpak_bwrap_add_args (proxy_arg_bwrap, "--log", NULL);
flatpak_bwrap_add_args (app_bwrap,
"--ro-bind", proxy_socket, "/run/dbus/system_bus_socket",
NULL);
flatpak_bwrap_set_env (app_bwrap, "DBUS_SYSTEM_BUS_ADDRESS", "unix:path=/run/dbus/system_bus_socket", TRUE);
return TRUE;
}
return FALSE;
}
static gboolean
flatpak_run_add_session_dbus_args (FlatpakBwrap *app_bwrap,
FlatpakBwrap *proxy_arg_bwrap,
FlatpakContext *context,
FlatpakRunFlags flags,
const char *app_id)
{
static const char sandbox_socket_path[] = "/run/flatpak/bus";
static const char sandbox_dbus_address[] = "unix:path=/run/flatpak/bus";
gboolean unrestricted, no_proxy;
const char *dbus_address = g_getenv ("DBUS_SESSION_BUS_ADDRESS");
g_autofree char *dbus_session_socket = NULL;
unrestricted = (context->sockets & FLATPAK_CONTEXT_SOCKET_SESSION_BUS) != 0;
if (dbus_address != NULL)
{
dbus_session_socket = extract_unix_path_from_dbus_address (dbus_address);
}
else
{
g_autofree char *user_runtime_dir = flatpak_get_real_xdg_runtime_dir ();
struct stat statbuf;
dbus_session_socket = g_build_filename (user_runtime_dir, "bus", NULL);
if (stat (dbus_session_socket, &statbuf) < 0
|| (statbuf.st_mode & S_IFMT) != S_IFSOCK
|| statbuf.st_uid != getuid ())
return FALSE;
}
if (unrestricted)
g_debug ("Allowing session-dbus access");
no_proxy = (flags & FLATPAK_RUN_FLAG_NO_SESSION_BUS_PROXY) != 0;
if (dbus_session_socket != NULL && unrestricted)
{
flatpak_bwrap_add_args (app_bwrap,
"--ro-bind", dbus_session_socket, sandbox_socket_path,
NULL);
flatpak_bwrap_set_env (app_bwrap, "DBUS_SESSION_BUS_ADDRESS", sandbox_dbus_address, TRUE);
flatpak_bwrap_add_runtime_dir_member (app_bwrap, "bus");
return TRUE;
}
else if (!no_proxy && dbus_address != NULL)
{
g_autofree char *proxy_socket = create_proxy_socket ("session-bus-proxy-XXXXXX");
if (proxy_socket == NULL)
return FALSE;
flatpak_bwrap_add_args (proxy_arg_bwrap, dbus_address, proxy_socket, NULL);
if (!unrestricted)
{
flatpak_context_add_bus_filters (context, app_id, TRUE, flags & FLATPAK_RUN_FLAG_SANDBOX, proxy_arg_bwrap);
/* Allow calling any interface+method on all portals, but only receive broadcasts under /org/desktop/portal */
flatpak_bwrap_add_arg (proxy_arg_bwrap,
"--call=org.freedesktop.portal.*=*");
flatpak_bwrap_add_arg (proxy_arg_bwrap,
"--broadcast=org.freedesktop.portal.*=@/org/freedesktop/portal/*");
}
if ((flags & FLATPAK_RUN_FLAG_LOG_SESSION_BUS) != 0)
flatpak_bwrap_add_args (proxy_arg_bwrap, "--log", NULL);
flatpak_bwrap_add_args (app_bwrap,
"--ro-bind", proxy_socket, sandbox_socket_path,
NULL);
flatpak_bwrap_set_env (app_bwrap, "DBUS_SESSION_BUS_ADDRESS", sandbox_dbus_address, TRUE);
flatpak_bwrap_add_runtime_dir_member (app_bwrap, "bus");
return TRUE;
}
return FALSE;
}
static gboolean
flatpak_run_add_a11y_dbus_args (FlatpakBwrap *app_bwrap,
FlatpakBwrap *proxy_arg_bwrap,
FlatpakContext *context,
FlatpakRunFlags flags)
{
static const char sandbox_socket_path[] = "/run/flatpak/at-spi-bus";
static const char sandbox_dbus_address[] = "unix:path=/run/flatpak/at-spi-bus";
g_autoptr(GDBusConnection) session_bus = NULL;
g_autofree char *a11y_address = NULL;
g_autoptr(GError) local_error = NULL;
g_autoptr(GDBusMessage) reply = NULL;
g_autoptr(GDBusMessage) msg = NULL;
g_autofree char *proxy_socket = NULL;
if ((flags & FLATPAK_RUN_FLAG_NO_A11Y_BUS_PROXY) != 0)
return FALSE;
session_bus = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, NULL);
if (session_bus == NULL)
return FALSE;
msg = g_dbus_message_new_method_call ("org.a11y.Bus", "/org/a11y/bus", "org.a11y.Bus", "GetAddress");
g_dbus_message_set_body (msg, g_variant_new ("()"));
reply =