Newer
Older
/*
* Cut-down version of common/flatpak-run.c from Flatpak
* Last updated: Flatpak 1.12.7
* Copyright © 2017-2022 Collabora Ltd.
* Copyright © 2014-2022 Red Hat, Inc
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* 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 "flatpak-run-private.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/personality.h>
#include <grp.h>
#include <unistd.h>
#if 0
#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
#endif
#ifdef ENABLE_XAUTH
#include <X11/Xauth.h>
#endif
#if 0
#include <glib/gi18n-lib.h>
#endif
#include <gio/gio.h>
#include "libglnx.h"
#include "flatpak-utils-base-private.h"
#include "flatpak-utils-private.h"
#include "flatpak-systemd-dbus-generated.h"
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);
}
/* This is part of the X11 protocol, so we can safely hard-code it here */
#define FamilyInternet6 (6)
#ifdef ENABLE_XAUTH
static gboolean
auth_streq (const char *str,
const char *au_str,
size_t au_len)
{
return au_len == strlen (str) && memcmp (str, au_str, au_len) == 0;
}
static gboolean
xauth_entry_should_propagate (const Xauth *xa,

Simon McVittie
committed
int family,
const char *remote_hostname,
const char *local_hostname,
const char *number)

Simon McVittie
committed
/* ensure entry isn't for a different type of access */
if (family != FamilyWild && xa->family != family && xa->family != FamilyWild)
return FALSE;
/* ensure entry isn't for remote access, except that if remote_hostname
* is specified, then remote access to that hostname is OK */
if (xa->family != FamilyWild && xa->family != FamilyLocal &&
(remote_hostname == NULL ||
!auth_streq (remote_hostname, xa->address, xa->address_length)))
return FALSE;
/* ensure entry is for this machine */

Simon McVittie
committed
if (xa->family == FamilyLocal && !auth_streq (local_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

Simon McVittie
committed
write_xauth (int family,
const char *remote_host,
const char *number,
{
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;

Simon McVittie
committed
if (xauth_entry_should_propagate (xa, family, remote_host,
unames.nodename, number))
{
local_xa = *xa;
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);
}
#else /* !ENABLE_XAUTH */
/* When not doing Xauth, any distinct values will do, but use the same
* ones Xauth does so that we can refer to them in our unit test. */
#define FamilyLocal (256)
#define FamilyWild (65535)
#endif /* !ENABLE_XAUTH */
/*
* @family: (out) (not optional):
* @x11_socket: (out) (not optional):
* @display_nr_out: (out) (not optional):
*/
gboolean
flatpak_run_parse_x11_display (const char *display,
char **x11_socket,
char **remote_host,
char **display_nr_out,
GError **error)
{
const char *colon;
const char *display_nr;
const char *display_nr_end;
/* Use the last ':', not the first, to cope with [::1]:0 */
colon = strrchr (display, ':');
if (colon == NULL)
return glnx_throw (error, "No colon found in DISPLAY=%s", display);
if (!g_ascii_isdigit (colon[1]))
return glnx_throw (error, "Colon not followed by a digit in DISPLAY=%s", display);
display_nr = &colon[1];
display_nr_end = display_nr;
while (g_ascii_isdigit (*display_nr_end))
display_nr_end++;
*display_nr_out = g_strndup (display_nr, display_nr_end - display_nr);
if (display == colon || g_str_has_prefix (display, "unix:"))
{
*family = FamilyLocal;
*x11_socket = g_strdup_printf ("/tmp/.X11-unix/X%s", *display_nr_out);
}
else if (display[0] == '[' && display[colon - display - 1] == ']')
{
*family = FamilyInternet6;
*remote_host = g_strndup (display + 1, colon - display - 2);
}
else
{
*family = FamilyWild;
*remote_host = g_strndup (display, colon - display);
}
return TRUE;
}
flatpak_run_add_x11_args (FlatpakBwrap *bwrap,
gboolean allowed,
FlatpakContextShares shares)
{
g_autofree char *x11_socket = NULL;
const char *display;
g_autoptr(GError) local_error = NULL;
/* 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 != NULL)
g_autofree char *remote_host = NULL;
g_autofree char *display_nr = NULL;
int family = -1;
if (!flatpak_run_parse_x11_display (display, &family, &x11_socket,
&remote_host, &display_nr,
&local_error))
{
g_warning ("%s", local_error->message);
flatpak_bwrap_unset_env (bwrap, "DISPLAY");
return;
}
g_assert (display_nr != NULL);

Simon McVittie
committed
if (x11_socket != NULL
&& g_file_test (x11_socket, G_FILE_TEST_EXISTS))
g_assert (g_str_has_prefix (x11_socket, "/tmp/.X11-unix/X"));
flatpak_bwrap_add_args (bwrap,
"--ro-bind", x11_socket, x11_socket,
flatpak_bwrap_set_env (bwrap, "DISPLAY", display, TRUE);
}
else if ((shares & FLATPAK_CONTEXT_SHARED_NETWORK) == 0)
{
/* If DISPLAY is for example :42 but /tmp/.X11-unix/X42
* doesn't exist, then the only way this is going to work
* is if the app can connect to abstract socket
* @/tmp/.X11-unix/X42 or to TCP port localhost:6042,

Simon McVittie
committed
* either of which requires a shared network namespace.
*
* Alternatively, if DISPLAY is othermachine:23, then we
* definitely need access to TCP port othermachine:6023. */
if (x11_socket != NULL)
g_warning ("X11 socket %s does not exist in filesystem.",
x11_socket);
else
g_warning ("Remote X11 display detected.");
g_warning ("X11 access will require --share=network permission.");
}
else if (x11_socket != NULL)
{
g_warning ("X11 socket %s does not exist in filesystem, "
"trying to use abstract socket instead.",
x11_socket);
}
else
{
flatpak_debug2 ("Assuming --share=network gives access to remote X11");
}
#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/pressure-vessel/Xauthority";
write_xauth (family, remote_host, display_nr, 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");
}
}
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";
if (wayland_display[0] == '/')
wayland_socket = g_strdup (wayland_display);
else
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/pressure-vessel/%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;
}
#if 0
static void
flatpak_run_add_ssh_args (FlatpakBwrap *bwrap)
{
static const char sandbox_auth_socket[] = "/run/flatpak/ssh-auth";
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
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);
}
#endif
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
/* 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,
* or NULL with @remote set if @value points to a remote server.
flatpak_run_parse_pulse_server (const char *value,
gboolean *remote)
{
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);
if (g_str_has_prefix (server, "tcp:"))
{
*remote = TRUE;
return NULL;
}
}
return NULL;
}
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
/*
* 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;
}
flatpak_run_add_pulseaudio_args (FlatpakBwrap *bwrap,
FlatpakContextShares shares)
{
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 ();
gboolean remote = FALSE;
if (pulseaudio_server)
pulseaudio_socket = flatpak_run_parse_pulse_server (pulseaudio_server,
&remote);
if (pulseaudio_socket == NULL && !remote)
{
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 == NULL && !remote)
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 (remote)
{
if ((shares & FLATPAK_CONTEXT_SHARED_NETWORK) == 0)
{
g_warning ("Remote PulseAudio server configured.");
g_warning ("PulseAudio access will require --share=network permission.");
}
g_debug ("Using remote PulseAudio server \"%s\"", pulseaudio_server);
flatpak_bwrap_set_env (bwrap, "PULSE_SERVER", pulseaudio_server, TRUE);
}
else if (pulseaudio_socket && g_file_test (pulseaudio_socket, G_FILE_TEST_EXISTS))
static const char sandbox_socket_path[] = "/run/pressure-vessel/pulse/native";
static const char pulse_server[] = "unix:/run/pressure-vessel/pulse/native";
static const char config_path[] = "/run/pressure-vessel/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 (!remote && g_file_test ("/dev/snd", G_FILE_TEST_IS_DIR))
flatpak_bwrap_add_args (bwrap, "--dev-bind", "/dev/snd", "/dev/snd", NULL);
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);
}
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);
}
#endif
/* Simplified from Flatpak: we never restrict access to the D-Bus system bus */
gboolean
flatpak_run_add_system_dbus_args (FlatpakBwrap *app_bwrap)
{
gboolean unrestricted;
const char *dbus_address = g_getenv ("DBUS_SYSTEM_BUS_ADDRESS");
#if 0
g_autofree char *real_dbus_address = NULL;
#endif
g_autofree char *dbus_system_socket = NULL;
unrestricted = TRUE;
if (unrestricted)
g_debug ("Allowing system-dbus access");
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");