forked from Mirrors/flatpak-builder
265 lines
8.3 KiB
C
265 lines
8.3 KiB
C
/*
|
|
* 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 2.1 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 <locale.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
|
|
#include <glib/gi18n.h>
|
|
|
|
#include "libglnx/libglnx.h"
|
|
|
|
#include "flatpak-builtins.h"
|
|
#include "flatpak-utils.h"
|
|
#include "flatpak-dbus.h"
|
|
#include "flatpak-run.h"
|
|
|
|
|
|
static GOptionEntry options[] = {
|
|
{ NULL }
|
|
};
|
|
|
|
|
|
gboolean
|
|
flatpak_builtin_enter (int argc,
|
|
char **argv,
|
|
GCancellable *cancellable,
|
|
GError **error)
|
|
{
|
|
g_autoptr(GOptionContext) context = NULL;
|
|
int rest_argv_start, rest_argc;
|
|
const char *ns_name[] = { "ipc", "net", "pid", "mnt", "user" };
|
|
int ns_fd[G_N_ELEMENTS (ns_name)];
|
|
char pid_ns[256] = { 0 };
|
|
ssize_t pid_ns_len;
|
|
char self_ns[256];
|
|
ssize_t self_ns_len;
|
|
char *pid_s;
|
|
int pid, i;
|
|
g_autofree char *environment_path = NULL;
|
|
g_autoptr(GPtrArray) argv_array = NULL;
|
|
g_autoptr(GPtrArray) envp_array = NULL;
|
|
g_autofree char *environment = NULL;
|
|
gsize environment_len;
|
|
char *e;
|
|
g_autofree char *pulse_path = NULL;
|
|
g_autofree char *session_bus_path = NULL;
|
|
g_autofree char *xdg_runtime_dir = NULL;
|
|
g_autofree char *stat_path = NULL;
|
|
g_autofree char *root_path = NULL;
|
|
char root_link[256] = { 0 };
|
|
gssize root_link_len;
|
|
g_autofree char *cwd_path = NULL;
|
|
char cwd_link[256] = { 0 };
|
|
gssize cwd_link_len;
|
|
int status;
|
|
struct stat stat_buf;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
|
|
context = g_option_context_new (_("SANDBOXEDPID [COMMAND [args...]] - Run a command inside a running sandbox"));
|
|
g_option_context_set_translation_domain (context, GETTEXT_PACKAGE);
|
|
|
|
rest_argc = 0;
|
|
for (i = 1; i < argc; i++)
|
|
{
|
|
/* The non-option is the command, take it out of the arguments */
|
|
if (argv[i][0] != '-')
|
|
{
|
|
rest_argv_start = i;
|
|
rest_argc = argc - i;
|
|
argc = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!flatpak_option_context_parse (context, options, &argc, &argv, FLATPAK_BUILTIN_FLAG_NO_DIR, NULL, cancellable, error))
|
|
return FALSE;
|
|
|
|
if (rest_argc < 2)
|
|
{
|
|
usage_error (context, _("SANDBOXEDPID and COMMAND must be specified"), error);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Before further checks, warn if we are not already root */
|
|
if (geteuid () != 0)
|
|
g_printerr ("%s\n", _("Not running as root, may be unable to enter namespace"));
|
|
|
|
pid_s = argv[rest_argv_start];
|
|
|
|
pid = atoi (pid_s);
|
|
if (pid <= 0)
|
|
return flatpak_fail (error, _("Invalid pid %s"), pid_s);
|
|
|
|
stat_path = g_strdup_printf ("/proc/%d/root", pid);
|
|
if (stat (stat_path, &stat_buf))
|
|
return flatpak_fail (error, _("No such pid %s"), pid_s);
|
|
|
|
uid = stat_buf.st_uid;
|
|
gid = stat_buf.st_gid;
|
|
|
|
environment_path = g_strdup_printf ("/proc/%d/environ", pid);
|
|
if (!g_file_get_contents (environment_path, &environment, &environment_len, error))
|
|
return FALSE;
|
|
|
|
cwd_path = g_strdup_printf ("/proc/%d/cwd", pid);
|
|
cwd_link_len = readlink (cwd_path, cwd_link, sizeof (cwd_link) - 1);
|
|
if (cwd_link_len <= 0)
|
|
return flatpak_fail (error, _("Can't read cwd"));
|
|
|
|
root_path = g_strdup_printf ("/proc/%d/root", pid);
|
|
root_link_len = readlink (root_path, root_link, sizeof (root_link) - 1);
|
|
if (root_link_len <= 0)
|
|
return flatpak_fail (error, _("Can't read root"));
|
|
|
|
for (i = 0; i < G_N_ELEMENTS (ns_name); i++)
|
|
{
|
|
g_autofree char *path = g_strdup_printf ("/proc/%d/ns/%s", pid, ns_name[i]);
|
|
g_autofree char *self_path = g_strdup_printf ("/proc/self/ns/%s", ns_name[i]);
|
|
|
|
pid_ns_len = readlink (path, pid_ns, sizeof (pid_ns) - 1);
|
|
if (pid_ns_len <= 0)
|
|
return flatpak_fail (error, _("Invalid %s namespace for pid %d"), ns_name[i], pid);
|
|
pid_ns[pid_ns_len] = 0;
|
|
|
|
self_ns_len = readlink (self_path, self_ns, sizeof (self_ns) - 1);
|
|
if (self_ns_len <= 0)
|
|
return flatpak_fail (error, _("Invalid %s namespace for self"), ns_name[i]);
|
|
self_ns[self_ns_len] = 0;
|
|
|
|
if (strcmp (self_ns, pid_ns) == 0)
|
|
{
|
|
/* No need to setns to the same namespace, it will only fail */
|
|
ns_fd[i] = -1;
|
|
}
|
|
else
|
|
{
|
|
ns_fd[i] = open (path, O_RDONLY);
|
|
if (ns_fd[i] == -1)
|
|
return flatpak_fail (error, _("Can't open %s namespace: %s"), ns_name[i], g_strerror (errno));
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < G_N_ELEMENTS (ns_fd); i++)
|
|
{
|
|
if (ns_fd[i] != -1)
|
|
{
|
|
if (setns (ns_fd[i], 0) == -1)
|
|
return flatpak_fail (error, _("Can't enter %s namespace: %s"), ns_name[i], g_strerror (errno));
|
|
close (ns_fd[i]);
|
|
}
|
|
}
|
|
|
|
if (chdir (cwd_link))
|
|
return flatpak_fail (error, _("Can't chdir"));
|
|
|
|
if (chroot (root_link))
|
|
return flatpak_fail (error, _("Can't chroot"));
|
|
|
|
envp_array = g_ptr_array_new_with_free_func (g_free);
|
|
for (e = environment; e < environment + environment_len; e = e + strlen (e) + 1)
|
|
{
|
|
if (*e != 0 &&
|
|
!g_str_has_prefix (e, "DISPLAY=") &&
|
|
!g_str_has_prefix (e, "PULSE_SERVER=") &&
|
|
!g_str_has_prefix (e, "PULSE_CLIENTCONFIG=") &&
|
|
!g_str_has_prefix (e, "XDG_RUNTIME_DIR=") &&
|
|
!g_str_has_prefix (e, "DBUS_SYSTEM_BUS_ADDRESS=") &&
|
|
!g_str_has_prefix (e, "DBUS_SESSION_BUS_ADDRESS="))
|
|
{
|
|
if (g_str_has_prefix (e, "_LD_LIBRARY_PATH="))
|
|
e++;
|
|
g_ptr_array_add (envp_array, g_strdup (e));
|
|
}
|
|
}
|
|
|
|
xdg_runtime_dir = g_strdup_printf ("/run/user/%d", uid);
|
|
g_ptr_array_add (envp_array, g_strdup_printf ("XDG_RUNTIME_DIR=%s", xdg_runtime_dir));
|
|
|
|
if (g_file_test ("/tmp/.X11-unix/X99", G_FILE_TEST_EXISTS))
|
|
g_ptr_array_add (envp_array, g_strdup ("DISPLAY=:99.0"));
|
|
|
|
pulse_path = g_strdup_printf ("/run/user/%d/pulse/native", uid);
|
|
if (g_file_test (pulse_path, G_FILE_TEST_EXISTS))
|
|
{
|
|
g_ptr_array_add (envp_array, g_strdup_printf ("PULSE_SERVER=unix:%s", pulse_path));
|
|
g_ptr_array_add (envp_array, g_strdup_printf ("PULSE_CLIENTCONFIG=/run/user/%d/pulse/config", uid));
|
|
}
|
|
|
|
session_bus_path = g_strdup_printf ("/run/user/%d/bus", uid);
|
|
if (g_file_test (session_bus_path, G_FILE_TEST_EXISTS))
|
|
g_ptr_array_add (envp_array, g_strdup_printf ("DBUS_SESSION_BUS_ADDRESS=unix:%s", session_bus_path));
|
|
|
|
if (g_file_test ("/run/dbus/system_bus_socket", G_FILE_TEST_EXISTS))
|
|
g_ptr_array_add (envp_array, g_strdup ("DBUS_SYSTEM_BUS_ADDRESS=unix:/run/dbus/system_bus_socket"));
|
|
|
|
g_ptr_array_add (envp_array, NULL);
|
|
|
|
argv_array = g_ptr_array_new_with_free_func (g_free);
|
|
for (i = 1; i < rest_argc; i++)
|
|
g_ptr_array_add (argv_array, g_strdup (argv[rest_argv_start + i]));
|
|
g_ptr_array_add (argv_array, NULL);
|
|
|
|
if (setgid (gid))
|
|
return flatpak_fail (error, _("Can't switch gid"));
|
|
|
|
if (setuid (uid))
|
|
return flatpak_fail (error, _("Can't switch uid"));
|
|
|
|
if (!g_spawn_sync (NULL, (char **) argv_array->pdata, (char **) envp_array->pdata,
|
|
G_SPAWN_SEARCH_PATH_FROM_ENVP | G_SPAWN_CHILD_INHERITS_STDIN,
|
|
NULL, NULL,
|
|
NULL, NULL,
|
|
&status, error))
|
|
return FALSE;
|
|
|
|
exit (status);
|
|
}
|
|
|
|
gboolean
|
|
flatpak_complete_enter (FlatpakCompletion *completion)
|
|
{
|
|
g_autoptr(GOptionContext) context = NULL;
|
|
|
|
context = g_option_context_new ("");
|
|
if (!flatpak_option_context_parse (context, options, &completion->argc, &completion->argv, FLATPAK_BUILTIN_FLAG_NO_DIR, NULL, NULL, NULL))
|
|
return FALSE;
|
|
|
|
switch (completion->argc)
|
|
{
|
|
case 0:
|
|
case 1:
|
|
flatpak_complete_options (completion, global_entries);
|
|
flatpak_complete_options (completion, options);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|