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/* $OpenBSD: nopermtest.c,v 1.1 2018/12/23 11:23:21 natano Exp $ */
/*
* Copyright (c) 2018 Martin Natano <natano@natano.net>
*
* 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/stat.h>
#include <sys/time.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#define EXPECT_OK(expr) do { \
int r = (expr); \
if (r == -1) { \
fprintf(stderr, "FAIL:%d: %s -> r=%d errno=%d(%s)\n", \
__LINE__, #expr, r, errno, strerror(errno)); \
nfail++; \
} \
} while (0)
#define EXPECT_ERRNO(expr, expected_errno) do { \
int r = (expr); \
if (r != -1 || errno != expected_errno) { \
fprintf(stderr, "FAIL:%d: %s -> r=%d errno=%d(%s)\n", \
__LINE__, #expr, r, errno, strerror(errno)); \
nfail++; \
} \
} while (0)
static void check_locked(const char *);
static void check_unlocked(const char *);
static void check_unlocked_vroot(void);
static void check_unlocked_subdir(void);
__dead static void usage(void);
static int nfail;
int
main(int argc, char **argv)
{
const char *mnt, *stage;
const char *errstr;
if (argc != 3)
usage();
mnt = argv[1];
stage = argv[2];
if (strcmp(stage, "locked") == 0)
check_locked(mnt);
else if (strcmp(stage, "unlocked") == 0)
check_unlocked(mnt);
else
usage();
return (nfail > 0);
}
static void
check_locked(const char *mnt)
{
char path[PATH_MAX];
EXPECT_OK(access(mnt, F_OK));
EXPECT_ERRNO(access(mnt, R_OK), EACCES);
EXPECT_ERRNO(access(mnt, W_OK), EACCES);
EXPECT_ERRNO(access(mnt, X_OK), EACCES);
(void)snprintf(path, PATH_MAX, "%s/stdin", mnt);
EXPECT_ERRNO(mknod(path, S_IFCHR | 0700, makedev(22, 0)), EACCES);
EXPECT_ERRNO(chown(mnt, getuid(), -1), EPERM);
EXPECT_ERRNO(chmod(mnt, 0700), EPERM);
EXPECT_ERRNO(chflags(mnt, SF_ARCHIVED), EPERM);
EXPECT_ERRNO(utimes(mnt, NULL), EACCES);
}
static void
check_unlocked(const char *mnt)
{
if (chdir(mnt) == -1)
err(1, "chdir");
check_unlocked_vroot();
check_unlocked_subdir();
}
static void
check_unlocked_vroot(void)
{
int fd;
EXPECT_OK(access(".", R_OK | W_OK | X_OK));
EXPECT_ERRNO(mknod("stdin", S_IFCHR | 0700, makedev(22, 0)), EPERM);
EXPECT_ERRNO(chown(".", 0, -1), EPERM);
EXPECT_OK(chmod(".", 0700));
EXPECT_ERRNO(chflags(".", SF_ARCHIVED), EPERM);
EXPECT_OK(utimes(".", NULL));
}
static void
check_unlocked_subdir(void)
{
if (mkdir("sub", 0000) == -1)
err(1, "mkdir");
EXPECT_OK(access("sub", R_OK | W_OK | X_OK));
EXPECT_OK(mknod("sub/stdin", S_IFCHR | 0700, makedev(22, 0)));
EXPECT_OK(chown("sub", 0, -1));
EXPECT_OK(chmod("sub", 0000));
EXPECT_OK(chflags("sub", SF_ARCHIVED));
EXPECT_OK(utimes("sub", NULL));
EXPECT_OK(chmod("sub", S_ISVTX | 0700));
EXPECT_OK(chown("sub/stdin", 0, -1));
EXPECT_OK(rename("sub/stdin", "sub/stdin2"));
EXPECT_OK(unlink("sub/stdin2"));
}
__dead static void
usage(void)
{
(void)fprintf(stderr, "usage: %s mnt stage\n", getprogname());
exit(1);
}
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