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/* $OpenBSD: main.c,v 1.6 2015/09/27 17:55:39 semarie Exp $ */
/*
* Copyright (c) 2015 Sebastien Marie <semarie@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "manager.h"
static void
test_nop()
{
/* nop */
}
static void
test_inet()
{
int fd = socket(AF_INET, SOCK_STREAM, 0);
int saved_errno = errno;
close(fd);
errno = saved_errno ? saved_errno : errno;
}
static void
test_kill()
{
kill(0, SIGINT);
}
static void
test_allowed_syscalls()
{
clock_getres(CLOCK_MONOTONIC, NULL);
clock_gettime(CLOCK_MONOTONIC, NULL);
/* fchdir(); */
getdtablecount();
getegid();
geteuid();
getgid();
getgroups(0, NULL);
getitimer(ITIMER_REAL, NULL);
getlogin();
getpgid(0);
getpgrp();
getpid();
getppid();
/* getresgid(); */
/* getresuid(); */
{ struct rlimit rl; getrlimit(RLIMIT_CORE, &rl); }
getsid(0);
getthrid();
{ struct timeval tp; gettimeofday(&tp, NULL); }
getuid();
geteuid();
issetugid();
/* nanosleep(); */
/* sigreturn(); */
umask(0000);
/* wait4(); */
}
static void
open_close(const char *filename)
{
int fd;
int saved_errno;
errno = 0;
printf("\n open_close(\"%s\")", filename);
fd = open(filename, O_RDONLY);
saved_errno = errno;
printf(" fd=%d errno=%d", fd, errno);
if (fd != -1)
close(fd);
errno = saved_errno;
}
static void
test_wpaths()
{
/* absolute file */
open_close("/etc/passwd");
/* relative */
open_close("generic");
/* relative */
open_close("../../../../../../../../../../../../../../../etc/passwd");
/* ENOENT */
open_close("/nonexistent");
/* calling exit to flush stdout */
printf("\n");
exit(EXIT_SUCCESS);
}
static void
test_tame()
{
const char *wpaths[] = { "/sbin", NULL };
if (tame("stdio rpath", wpaths) != 0)
_exit(errno);
}
static void
do_stat(const char *path)
{
char resolved[PATH_MAX];
struct stat sb;
printf("\n stat(\"%s\"):", path);
/* call realpath(3) */
errno = 0;
if (realpath(path, resolved) != NULL)
printf(" realpath=\"%s\"", resolved);
else
printf(" realpath=failed(%d)", errno);
/* call stat(2) */
errno = 0;
if (stat(path, &sb) == 0)
printf(" uid=%d gid=%d mode=%04o", sb.st_uid, sb.st_gid,
sb.st_mode);
else
printf(" errno=%d", errno);
}
static void
test_stat()
{
/* in whitelisted path */
do_stat("/usr/share/man/man8/afterboot.8");
do_stat("/usr/share/man/man8/");
do_stat("/usr/share/man");
/* parent of whitelisted path */
do_stat("/usr/share");
do_stat("/usr");
do_stat("/");
/* outside whitelisted path */
do_stat("/usr/bin/gzip");
/* calling exit to flush stdout */
printf("\n");
exit(EXIT_SUCCESS);
}
int
main(int argc, char *argv[])
{
int ret = EXIT_SUCCESS;
if (argc != 1)
errx(1, "usage: %s", argv[0]);
/*
* testsuite
*/
/* _exit is always allowed, and nothing else under flags=0 */
start_test(&ret, "", NULL, test_nop);
start_test(&ret, "", NULL, test_inet);
/* test coredump */
start_test(&ret, "abort", NULL, test_inet);
/* inet under inet is ok */
start_test(&ret, "inet", NULL, test_inet);
/* kill under inet is forbidden */
start_test(&ret, "inet", NULL, test_kill);
/* kill under proc is allowed */
start_test(&ret, "proc", NULL, test_kill);
/* tests TAME_SELF for permitted syscalls */
start_test(&ret, "malloc", NULL, test_allowed_syscalls);
start_test(&ret, "rw", NULL, test_allowed_syscalls);
start_test(&ret, "stdio", NULL, test_allowed_syscalls);
start_test(&ret, "rpath", NULL, test_allowed_syscalls);
start_test(&ret, "wpath", NULL, test_allowed_syscalls);
start_test(&ret, "tmppath", NULL, test_allowed_syscalls);
start_test(&ret, "inet", NULL, test_allowed_syscalls);
start_test(&ret, "unix", NULL, test_allowed_syscalls);
start_test(&ret, "cmsg", NULL, test_allowed_syscalls);
start_test(&ret, "dns", NULL, test_allowed_syscalls);
start_test(&ret, "getpw", NULL, test_allowed_syscalls);
/* tests req without TAME_SELF for "permitted syscalls" */
// XXX it is a documentation bug
start_test(&ret, "ioctl", NULL, test_allowed_syscalls);
start_test(&ret, "proc", NULL, test_allowed_syscalls);
start_test(&ret, "cpath", NULL, test_allowed_syscalls);
start_test(&ret, "abort", NULL, test_allowed_syscalls);
start_test(&ret, "fattr", NULL, test_allowed_syscalls);
/*
* test whitelist path
*/
start_test(&ret, "stdio rpath", NULL, test_wpaths);
start_test1(&ret, "stdio rpath", NULL, test_wpaths);
// XXX start_test1(&ret, "stdio rpath", "/", test_wpaths);
start_test1(&ret, "stdio rpath", "/etc", test_wpaths);
start_test1(&ret, "stdio rpath", "/etc/", test_wpaths);
start_test1(&ret, "stdio rpath", "/etc/passwd", test_wpaths);
// XXX start_test1(&ret, "stdio rpath", "/etc/passwd/", test_wpaths);
start_test1(&ret, "stdio rpath", "/bin", test_wpaths);
start_test1(&ret, "stdio rpath", "generic", test_wpaths);
start_test1(&ret, "stdio rpath", "", test_wpaths);
start_test1(&ret, "stdio rpath", ".", test_wpaths);
/*
* test tame(2) arguments
*/
/* same request */
start_test(&ret, "stdio rpath", NULL, test_tame);
/* same request (stdio = malloc rw) */
start_test(&ret, "malloc rw rpath", NULL, test_tame);
/* reduce request */
start_test(&ret, "stdio rpath wpath", NULL, test_tame);
/* reduce request (with same/other wpaths) */
start_test1(&ret, "stdio rpath wpath", "/sbin", test_tame);
start_test1(&ret, "stdio rpath wpath", "/", test_tame);
/* add request */
start_test(&ret, "stdio", NULL, test_tame);
/* change request */
start_test(&ret, "cmsg", NULL, test_tame);
/* test stat(2) */
start_test1(&ret, "stdio rpath", "/usr/share/man", test_stat);
return (ret);
}
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