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/*
* Copyright (c) Kerlabs 2008.
* Copyright (c) International Business Machines Corp., 2008
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Created by Renaud Lottiaux
*/
/*
* Check if setreuid behaves correctly with file permissions.
* The test creates a file as ROOT with permissions 0644, does a setreuid
* and then tries to open the file with RDWR permissions.
* The same test is done in a fork to check if new UIDs are correctly
* passed to the son.
*/
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <unistd.h>
#include <pwd.h>
#include "test.h"
#include "safe_macros.h"
#include "compat_16.h"
TCID_DEFINE(setreuid07);
int TST_TOTAL = 1;
static char testfile[256] = "";
static struct passwd *ltpuser;
static int fd = -1;
static void setup(void);
static void cleanup(void);
static void do_master_child(void);
int main(int ac, char **av)
{
pid_t pid;
tst_parse_opts(ac, av, NULL, NULL);
setup();
pid = FORK_OR_VFORK();
if (pid < 0)
tst_brkm(TBROK, cleanup, "Fork failed");
if (pid == 0)
do_master_child();
tst_record_childstatus(cleanup, pid);
cleanup();
tst_exit();
}
static void do_master_child(void)
{
int lc;
int pid;
int status;
for (lc = 0; TEST_LOOPING(lc); lc++) {
int tst_fd;
tst_count = 0;
if (SETREUID(NULL, 0, ltpuser->pw_uid) == -1) {
perror("setreuid failed");
exit(TFAIL);
}
/* Test 1: Check the process with new uid cannot open the file
* with RDWR permissions.
*/
TEST(tst_fd = open(testfile, O_RDWR));
if (TEST_RETURN != -1) {
printf("open succeeded unexpectedly\n");
close(tst_fd);
exit(TFAIL);
}
if (TEST_ERRNO == EACCES) {
printf("open failed with EACCES as expected\n");
} else {
perror("open failed unexpectedly");
exit(TFAIL);
}
/* Test 2: Check a son process cannot open the file
* with RDWR permissions.
*/
pid = FORK_OR_VFORK();
if (pid < 0)
tst_brkm(TBROK, cleanup, "Fork failed");
if (pid == 0) {
int tst_fd2;
/* Test to open the file in son process */
TEST(tst_fd2 = open(testfile, O_RDWR));
if (TEST_RETURN != -1) {
printf("call succeeded unexpectedly\n");
close(tst_fd2);
exit(TFAIL);
}
if (TEST_ERRNO == EACCES) {
printf("open failed with EACCES as expected\n");
exit(TPASS);
} else {
printf("open failed unexpectedly\n");
exit(TFAIL);
}
} else {
/* Wait for son completion */
if (waitpid(pid, &status, 0) == -1) {
perror("waitpid failed");
exit(TFAIL);
}
if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0))
exit(WEXITSTATUS(status));
}
/* Test 3: Fallback to initial uid and check we can again open
* the file with RDWR permissions.
*/
tst_count++;
if (SETREUID(NULL, 0, 0) == -1) {
perror("setreuid failed");
exit(TFAIL);
}
TEST(tst_fd = open(testfile, O_RDWR));
if (TEST_RETURN == -1) {
perror("open failed unexpectedly");
exit(TFAIL);
} else {
printf("open call succeeded\n");
close(tst_fd);
}
}
exit(TPASS);
}
static void setup(void)
{
tst_require_root();
ltpuser = getpwnam("nobody");
if (ltpuser == NULL)
tst_brkm(TBROK, NULL, "nobody must be a valid user.");
tst_tmpdir();
sprintf(testfile, "setreuid07file%d.tst", getpid());
/* Create test file */
fd = SAFE_OPEN(cleanup, testfile, O_CREAT | O_RDWR, 0644);
tst_sig(FORK, DEF_HANDLER, cleanup);
TEST_PAUSE;
}
static void cleanup(void)
{
close(fd);
tst_rmdir();
}
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