Delete the change_owner binary, as it is an insecure suid root binary; rewrite tests...

[ltp-debian.git] / testcases / kernel / syscalls / fchown / fchown04.c

/*
 *
 *   Copyright (c) International Business Machines  Corp., 2001
 *
 *   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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/*
 * Test Name: fchown04
 *
 * Test Description:
 *   Verify that,
 *   1) fchown(2) returns -1 and sets errno to EPERM if the effective user id
 *      of process does not match the owner of the file and the process is
 *      not super user.
 *   2) fchown(2) returns -1 and sets errno to EBADF if the file descriptor
 *      of the specified file is not valid.
 *
 * Expected Result:
 *  fchown() should fail with return value -1 and set expected errno.
 *
 * Algorithm:
 *  Setup:
 *   Setup signal handling.
 *   Create temporary directory.
 *   Pause for SIGUSR1 if option specified.
 *
 *  Test:
 *   Loop if the proper options are given.
 *   Execute system call
 *   Check return code, if system call failed (return=-1)
 *      if errno set == expected errno
 *              Issue sys call fails with expected return value and errno.
 *      Otherwise,
 *              Issue sys call fails with unexpected errno.
 *   Otherwise,
 *      Issue sys call returns unexpected value.
 *
 *  Cleanup:
 *   Print errno log and/or timing stats if options given
 *   Delete the temporary directory(s)/file(s) created.
 *
 * Usage:  <for command-line>
 *  fchown04 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
 *     where,  -c n : Run n copies concurrently.
 *             -e   : Turn on errno logging.
 *             -i n : Execute test n times.
 *             -I x : Execute test for x seconds.
 *             -P x : Pause for x seconds between iterations.
 *             -t   : Turn on syscall timing.
 *
 * HISTORY
 *      07/2001 Ported by Wayne Boyer
 *
 * RESTRICTIONS:
 *  This test should be executed by 'non-super-user' only.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <grp.h>
#include <pwd.h>
#include <sys/types.h>
#include <sys/stat.h>

#include "test.h"
#include "usctest.h"

#define MODE_RWX        S_IRWXU | S_IRWXG | S_IRWXO
#define FILE_MODE       S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH
#define TEST_FILE1      "tfile_1"
#define TEST_FILE2      "tfile_2"

int no_setup();
int setup1();                   /* setup function to test chmod for EPERM */
int setup2();                   /* setup function to test chmod for EBADF */

int fd1;                        /* File descriptor for testfile1 */
int fd2;                        /* File descriptor for testfile2 */

struct test_case_t {            /* test case struct. to hold ref. test cond's */
        int fd;
        char *desc;
        int exp_errno;
        int (*setupfunc) ();
} Test_cases[] = {
        {
        1, "Process is not owner/root", EPERM, setup1}, {
        2, "File descriptor is not valid", EBADF, setup2}, {
        0, NULL, 0, no_setup}
};

char test_home[PATH_MAX];       /* variable to hold TESTHOME env */
char *TCID = "fchown04";        /* Test program identifier.    */
int TST_TOTAL = 2;              /* Total number of test cases. */
extern int Tst_count;           /* Test Case counter for tst_* routines */
int exp_enos[] = { EPERM, EBADF, 0 };

char bin_uid[] = "bin";
struct passwd *ltpuser;

void setup();                   /* Main setup function for the tests */
void cleanup();                 /* cleanup function for the test */

int main(int ac, char **av)
{
        int lc;                 /* loop counter */
        char *msg;              /* message returned from parse_opts */
        char *test_desc;        /* test specific error message */
        int fd;                 /* test file descriptor */
        int ind;                /* counter to test different test conditions */
        uid_t User_id;          /* Effective user id of a test process */
        gid_t Group_id;         /* Effective group id of a test process */

        /* Parse standard options given to run the test. */
        msg = parse_opts(ac, av, (option_t *) NULL, NULL);
        if (msg != (char *)NULL) {
                tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
                tst_exit();
        }

        /*
         * Invoke setup function to call individual test setup functions
         * to simulate test conditions.
         */
        setup();

        /* set the expected errnos... */
        TEST_EXP_ENOS(exp_enos);

        /* Set uid/gid values to that of test process */
        User_id = geteuid();
        Group_id = getegid();

        /* Check looping state if -i option given */
        for (lc = 0; TEST_LOOPING(lc); lc++) {
                /* Reset Tst_count in case we are looping. */
                Tst_count = 0;

                for (ind = 0; Test_cases[ind].desc != NULL; ind++) {
                        fd = Test_cases[ind].fd;
                        test_desc = Test_cases[ind].desc;

                        if (fd == 1) {
                                fd = fd1;
                        } else {
                                fd = fd2;
                        }

                        /*
                         * Call fchown(2) to test different test conditions.
                         * verify that it fails with -1 return value and
                         * sets appropriate errno.
                         */
                        TEST(fchown(fd, User_id, Group_id));

                        /* Check return code from fchown(2) */
                        if (TEST_RETURN == -1) {
                                TEST_ERROR_LOG(TEST_ERRNO);
                                if (TEST_ERRNO == Test_cases[ind].exp_errno) {
                                        tst_resm(TPASS,
                                                 "fchown() fails, %s, errno:%d",
                                                 test_desc, TEST_ERRNO);
                                } else {
                                        tst_resm(TFAIL, "fchown() fails, %s, "
                                                 "errno:%d, expected errno:%d",
                                                 test_desc, TEST_ERRNO,
                                                 Test_cases[ind].exp_errno);
                                }
                        } else {
                                tst_resm(TFAIL, "fchown() returned %d, expected"
                                         " -1, errno:%d", TEST_RETURN,
                                         Test_cases[ind].exp_errno);
                        }
                }               /* End of TEST CASE LOOPING. */

        }                       /* End for TEST_LOOPING */

        /*
         * Invoke cleanup() to delete the test directory/file(s) created
         * in the setup().
         */
        cleanup();

         /*NOTREACHED*/ return (0);
}                               /* End main */

/*
 * setup(void) - performs all ONE TIME setup for this test.
 *
 *      Exit the test program on receipt of unexpected signals.
 *      Create a temporary directory and change directory to it.
 *      Invoke individual test setup functions according to the order
 *      set in struct. definition.
 */
void setup()
{
        int ind;                /* counter for setup functions */

        ltpuser = getpwnam(bin_uid);

        /* Capture unexpected signals */
        tst_sig(FORK, DEF_HANDLER, cleanup);

        /* Pause if that option was specified */
        TEST_PAUSE;

//changed by prashant yendigeri because the temp directory creating and deletinI// are with different uids, so this test case will fail in most of the scenario.
        /* Make a temp dir and cd to it */
//      tst_tmpdir();

        /* Get the current working directory of the process */
        if (getcwd(test_home, sizeof(test_home)) == NULL) {
                tst_brkm(TBROK, cleanup,
                         "getcwd(3) fails to get working directory of process");
        }

        /* Switch to bin user for correct error code collection */
        if (geteuid() != 0) {
                tst_brkm(TBROK, tst_exit, "Test must be run as root");
        }

        /* to let chown(TESTDIR, -1, getgid()) in tst_tmpdir() run
         * successfully even if getgid() is not in group_info of
         * the current process's task_struct till now
         */

        initgroups("root", getgid());

        if (setegid(ltpuser->pw_uid) == -1) {
                tst_resm(TINFO, "setegid failed to "
                         "to set the effective gid to %d", ltpuser->pw_uid);
                perror("setegid");
        }
        if (seteuid(ltpuser->pw_uid) == -1) {
                tst_resm(TINFO, "seteuid failed to "
                         "to set the effective uid to %d", ltpuser->pw_uid);
                perror("seteuid");
        }
//prashant yendigeri added the below line
        /* Make a temp dir and cd to it */
        tst_tmpdir();

        /* call individual setup functions */
        for (ind = 0; Test_cases[ind].desc != NULL; ind++) {
                Test_cases[ind].setupfunc();
        }
}                               /* End setup() */

/*
 * setup1() - setup function for a test condition for which fchown(2)
 *            returns -1 and sets errno to EPERM.
 *
 *  Create a test file under temporary directory.
 *  Get the current working directory of the process and invoke setuid
 *  to root program to change the ownership of testfile to that of
 *  "ltpuser2" user.
 */
int setup1()
{
        int old_uid, old_gid;
        struct passwd* nobody;

        /* Create a testfile under temporary directory */
        if ((fd1 = open(TEST_FILE1, O_RDWR | O_CREAT, 0666)) == -1) {
                tst_brkm(TBROK, cleanup,
                         "open(%s, O_RDWR|O_CREAT, 0666) failed, errno=%d : %s",
                         TEST_FILE1, errno, strerror(errno));
        }

        old_uid=geteuid();
        old_gid=getegid();
        seteuid(0);
        setegid(0);
        if(!(nobody=getpwnam("nobody")))
                tst_brkm(TBROK, cleanup,
                                                 "Couldn't find user nobody: %s", strerror(errno));

        if(fchown(fd1, nobody->pw_uid, nobody->pw_gid)<0)
                tst_brkm(TBROK, cleanup,
                                                 "Fail to modify %s ownership(s)! %s", TEST_FILE1, strerror(errno));

        seteuid(old_uid);
        setegid(old_gid);

        return 0;
}

/*
 * setup2() - setup function for a test condition for which fchown(2)
 *            returns -1 and sets errno to EBADF.
 *
 *  Create a testfile under temporary directory and close it such that
 *  fchown(2) attempts to modify the file which is already closed.
 */
int setup2()
{
        /* Create a testfile under temporary directory */
        if ((fd2 = open(TEST_FILE2, O_RDWR | O_CREAT, 0666)) == -1) {
                tst_brkm(TBROK, cleanup,
                         "open(%s, O_RDWR|O_CREAT, 0666) failed, errno=%d : %s",
                         TEST_FILE2, errno, strerror(errno));
        }

        /* Close the testfile opened above */
        if (close(fd2) == -1) {
                tst_brkm(TBROK, cleanup, "close(%s) Failed, errno=%d : %s",
                         TEST_FILE2, errno, strerror(errno));
        }
        return 0;
}

/*
 * no_setup() - Some test conditions for mknod(2) do not any setup.
 *              Hence, this function just returns 0.
 */
int no_setup()
{
        return 0;
}

/*
 * cleanup() - Performs all ONE TIME cleanup for this test at
 *             completion or premature exit.
 *
 *      Print test timing stats and errno log if test executed with options.
 *      Close the testfile if still opened.
 *      Remove temporary directory and sub-directories/files under it
 *      created during setup().
 *      Exit the test program with normal exit code.
 */
void cleanup()
{
        /*
         * print timing stats if that option was specified.
         * print errno log if that option was specified.
         */
        TEST_CLEANUP;

        if (close(fd1) == -1) {
                tst_brkm(TBROK, NULL, "close(%s) Failed, errno=%d : %s",
                         TEST_FILE1, errno, strerror(errno));
        }

        /* Remove files and temporary directory created */
        tst_rmdir();

        /* exit with return code appropriate for results */
        tst_exit();
}                               /* End cleanup() */