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/*
* Copyright (C) 2014-2020 Firejail Authors
*
* This file is part of firejail project
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "faudit.h"
#include "../include/rundefs.h"
#include <stdarg.h>
#include <sys/socket.h>
#include <sys/un.h>
// return 0 if the connection is possible
int check_unix(const char *sockfile) {
assert(sockfile);
int rv = -1;
// open socket
int sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock == -1)
return rv;
// connect
struct sockaddr_un remote;
memset(&remote, 0, sizeof(struct sockaddr_un));
remote.sun_family = AF_UNIX;
strncpy(remote.sun_path, sockfile, sizeof(remote.sun_path) - 1);
int len = strlen(remote.sun_path) + sizeof(remote.sun_family);
if (*sockfile == '@')
remote.sun_path[0] = '\0';
if (connect(sock, (struct sockaddr *)&remote, len) == 0)
rv = 0;
close(sock);
return rv;
}
static char *test_dbus_env(char *env_var_name) {
// check the session bus
char *str = getenv(env_var_name);
char *found = NULL;
if (str) {
int rv = 0;
char *bus = strdup(str);
if (!bus)
errExit("strdup");
char *sockfile;
if ((sockfile = strstr(bus, "unix:abstract=")) != NULL) {
sockfile += 13;
*sockfile = '@';
char *ptr = strchr(sockfile, ',');
if (ptr)
*ptr = '\0';
rv = check_unix(sockfile);
*sockfile = '@';
if (rv == 0)
printf("MAYBE: D-Bus socket %s is available\n", sockfile);
else if (rv == -1)
printf("GOOD: cannot connect to D-Bus socket %s\n", sockfile);
}
else if ((sockfile = strstr(bus, "unix:path=")) != NULL) {
sockfile += 10;
char *ptr = strchr(sockfile, ',');
if (ptr)
*ptr = '\0';
rv = check_unix(sockfile);
if (rv == 0) {
if (strcmp(RUN_DBUS_USER_SOCKET, sockfile) == 0 ||
strcmp(RUN_DBUS_SYSTEM_SOCKET, sockfile) == 0) {
printf("GOOD: D-Bus filtering is active on %s\n", sockfile);
} else {
printf("MAYBE: D-Bus socket %s is available\n", sockfile);
}
}
else if (rv == -1)
printf("GOOD: cannot connect to D-Bus socket %s\n", sockfile);
found = strdup(sockfile);
if (!found)
errExit("strdup");
}
else if ((sockfile = strstr(bus, "tcp:host=")) != NULL)
printf("UGLY: %s bus configured for TCP communication.\n", env_var_name);
else
printf("GOOD: cannot find a %s D-Bus socket\n", env_var_name);
free(bus);
}
else
printf("MAYBE: %s environment variable not configured.\n", env_var_name);
return found;
}
static void test_default_socket(const char *found, const char *format, ...) {
va_list ap;
va_start(ap, format);
char *sockfile;
if (vasprintf(&sockfile, format, ap) == -1)
errExit("vasprintf");
va_end(ap);
if (found != NULL && strcmp(found, sockfile) == 0)
goto end;
int rv = check_unix(sockfile);
if (rv == 0)
printf("MAYBE: D-Bus socket %s is available\n", sockfile);
end:
free(sockfile);
}
void dbus_test(void) {
char *found_user = test_dbus_env("DBUS_SESSION_BUS_ADDRESS");
test_default_socket(found_user, "/run/user/%d/bus", (int) getuid());
test_default_socket(found_user, "/run/user/%d/dbus/user_bus_socket", (int) getuid());
if (found_user != NULL)
free(found_user);
char *found_system = test_dbus_env("DBUS_SYSTEM_BUS_ADDRESS");
test_default_socket(found_system, "/run/dbus/system_bus_socket");
if (found_system != NULL)
free(found_system);
}
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