/*      $OpenBSD: t_mkdir.c,v 1.2 2021/12/13 16:56:48 deraadt Exp $     */
/* $NetBSD: t_mkdir.c,v 1.2 2011/10/15 07:38:31 jruoho Exp $ */

/*-
 * Copyright (c) 2008, 2011 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe and Jukka Ruohonen.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "macros.h"

#include <sys/stat.h>
#include <sys/wait.h>

#include "atf-c.h"
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

ATF_TC(mkdir_err);
ATF_TC_HEAD(mkdir_err, tc)
{
        atf_tc_set_md_var(tc, "descr", "Checks errors from mkdir(2)");
}

ATF_TC_BODY(mkdir_err, tc)
{
        char buf[PATH_MAX + 1];
        int fd;

        (void)memset(buf, 'x', sizeof(buf));

        fd = open("/etc", O_RDONLY);

        if (fd >= 0) {

                (void)close(fd);

                errno = 0;
                ATF_REQUIRE_ERRNO(EEXIST, mkdir("/etc", 0500) == -1);
        }

        errno = 0;
        ATF_REQUIRE_ERRNO(EFAULT, mkdir((void *)-1, 0500) == -1);

        errno = 0;
        ATF_REQUIRE_ERRNO(ENAMETOOLONG, mkdir(buf, 0500) == -1);

        errno = 0;
        ATF_REQUIRE_ERRNO(ENOENT, mkdir("/a/b/c/d/e/f/g/h/i/j/k", 0500) == -1);
}

ATF_TC_WITH_CLEANUP(mkdir_perm);
ATF_TC_HEAD(mkdir_perm, tc)
{
        atf_tc_set_md_var(tc, "descr", "Checks permissions with mkdir(2)");
        atf_tc_set_md_var(tc, "require.user", "unprivileged");
}

ATF_TC_BODY(mkdir_perm, tc)
{
        errno = 0;
        ATF_REQUIRE_ERRNO(EACCES, mkdir("/usr/__nonexistent__", 0500) == -1);
}

ATF_TC_CLEANUP(mkdir_perm, tc)
{
        (void)rmdir("/usr/__nonexistent__");
}

ATF_TC_WITH_CLEANUP(mkdir_mode);
ATF_TC_HEAD(mkdir_mode, tc)
{
        atf_tc_set_md_var(tc, "descr", "Test that UIDs and GIDs are right "
            "for a directory created with mkdir(2)");
        atf_tc_set_md_var(tc, "require.user", "root");
}

ATF_TC_BODY(mkdir_mode, tc)
{
        static const char *path = "/tmp/mkdir";
        struct stat st_a, st_b;
        struct passwd *pw;
        pid_t pid;
        int sta;

        (void)memset(&st_a, 0, sizeof(struct stat));
        (void)memset(&st_b, 0, sizeof(struct stat));

        pw = getpwnam("nobody");

        ATF_REQUIRE(pw != NULL);
        ATF_REQUIRE(stat("/tmp", &st_a) == 0);

        pid = fork();
        ATF_REQUIRE(pid >= 0);

        if (pid == 0) {

                if (setuid(pw->pw_uid) != 0)
                        _exit(EXIT_FAILURE);

                if (mkdir(path, 0500) != 0)
                        _exit(EXIT_FAILURE);

                _exit(EXIT_SUCCESS);
        }

        (void)sleep(1);
        (void)wait(&sta);

        if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS)
                atf_tc_fail("failed to create '%s'", path);

        ATF_REQUIRE(stat(path, &st_b) == 0);
        ATF_REQUIRE(rmdir(path) == 0);

        /*
         * The directory's owner ID should be set to the
         * effective UID, whereas the group ID should be
         * set to that of the parent directory.
         */
        if (st_b.st_uid != pw->pw_uid)
                atf_tc_fail("invalid UID for '%s'", path);

        if (st_b.st_gid != st_a.st_gid)
                atf_tc_fail("GID did not follow the parent directory");
}

ATF_TC_CLEANUP(mkdir_mode, tc)
{
        (void)rmdir("/tmp/mkdir");
}

ATF_TC(mkdir_trail);
ATF_TC_HEAD(mkdir_trail, tc)
{
        atf_tc_set_md_var(tc, "descr", "Checks mkdir(2) for trailing slashes");
}

ATF_TC_BODY(mkdir_trail, tc)
{
        const char *tests[] = {
                /*
                 * IEEE 1003.1 second ed. 2.2.2.78:
                 *
                 * If the pathname refers to a directory, it may also have
                 * one or more trailing slashes.  Multiple successive slashes
                 * are considered to be the same as one slash.
                 */
                "dir1/",
                "dir2//",

                NULL,
        };

        const char **test;

        for (test = &tests[0]; *test != NULL; ++test) {

                (void)printf("Checking \"%s\"\n", *test);
                (void)rmdir(*test);

                ATF_REQUIRE(mkdir(*test, 0777) == 0);
                ATF_REQUIRE(rename(*test, "foo") == 0);
                ATF_REQUIRE(rename("foo/", *test) == 0);
                ATF_REQUIRE(rmdir(*test) == 0);
        }
}

ATF_TP_ADD_TCS(tp)
{

        ATF_TP_ADD_TC(tp, mkdir_err);
        ATF_TP_ADD_TC(tp, mkdir_perm);
        ATF_TP_ADD_TC(tp, mkdir_mode);
        ATF_TP_ADD_TC(tp, mkdir_trail);

        return atf_no_error();
}