140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
/*
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* Copyright (c) International Business Machines Corp., 2001
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* 07/2001 Ported by Wayne Boyer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* Test Description:
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* Verify that, fchown(2) succeeds to change the group of a file specified
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* by path when called by non-root user with the following constraints,
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* - euid of the process is equal to the owner of the file.
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* - the intended gid is either egid, or one of the supplementary gids
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* of the process.
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* Also, verify that fchown() clears the setuid/setgid bits set on the file.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <signal.h>
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#include <grp.h>
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#include <pwd.h>
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#include "test.h"
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#include "safe_macros.h"
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#include "compat_16.h"
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#define FILE_MODE (mode_t)(S_IFREG | S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
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#define NEW_PERMS (mode_t)(S_IFREG | S_IRWXU | S_IRWXG | S_ISUID | S_ISGID)
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#define FCHOWN_PERMS (mode_t)(NEW_PERMS & ~(S_ISUID | S_ISGID))
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#define TESTFILE "testfile"
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TCID_DEFINE(fchown03);
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int TST_TOTAL = 1;
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static int fildes;
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char nobody_uid[] = "nobody";
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static struct passwd *ltpuser;
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static void setup(void);
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static void cleanup(void);
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int main(int ac, char **av)
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{
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struct stat stat_buf;
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int lc;
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uid_t user_id;
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gid_t group_id;
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tst_parse_opts(ac, av, NULL, NULL);
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setup();
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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tst_count = 0;
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user_id = geteuid();
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GID16_CHECK((group_id = getegid()), "fchown", cleanup)
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TEST(FCHOWN(cleanup, fildes, -1, group_id));
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if (TEST_RETURN == -1) {
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tst_resm(TFAIL, "fchown() on %s Fails, errno=%d",
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TESTFILE, TEST_ERRNO);
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continue;
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}
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SAFE_FSTAT(cleanup, fildes, &stat_buf);
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if ((stat_buf.st_uid != user_id) ||
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(stat_buf.st_gid != group_id)) {
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tst_resm(TFAIL, "%s: Incorrect "
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"ownership set, Expected %d %d",
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TESTFILE, user_id, group_id);
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continue;
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}
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if (stat_buf.st_mode != FCHOWN_PERMS) {
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tst_resm(TFAIL, "%s: Incorrect mode permissions"
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" %#o, Expected %#o", TESTFILE,
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stat_buf.st_mode, FCHOWN_PERMS);
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} else {
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tst_resm(TPASS, "fchown() on %s succeeds: "
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"Setuid/gid bits cleared", TESTFILE);
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}
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}
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cleanup();
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tst_exit();
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}
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static void setup(void)
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{
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tst_sig(FORK, DEF_HANDLER, cleanup);
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tst_require_root();
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ltpuser = SAFE_GETPWNAM(cleanup, nobody_uid);
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SAFE_SETEUID(NULL, ltpuser->pw_uid);
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TEST_PAUSE;
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tst_tmpdir();
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fildes = SAFE_OPEN(cleanup, TESTFILE, O_RDWR | O_CREAT, FILE_MODE);
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SAFE_SETEUID(cleanup, 0);
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SAFE_FCHOWN(cleanup, fildes, -1, 0);
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SAFE_FCHMOD(cleanup, fildes, NEW_PERMS);
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SAFE_SETEGID(cleanup, ltpuser->pw_gid);
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SAFE_SETEUID(cleanup, ltpuser->pw_uid);
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}
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static void cleanup(void)
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{
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if (fildes > 0 && close(fildes))
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tst_resm(TWARN | TERRNO, "close(%s) Failed", TESTFILE);
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tst_rmdir();
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}
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