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/*
* Copyright (C) 2014-2021 Firejail Authors
*
* This file is part of firejail project
*
* 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.
*/
#include "jailcheck.h"
#include <dirent.h>
#include <sys/wait.h>
typedef struct {
char *tfile;
} TestFile;
#define MAX_TEST_FILES 32
TestFile tf[MAX_TEST_FILES];
static int files_cnt = 0;
void sysfiles_setup(const char *file) {
// I am root!
assert(file);
if (files_cnt >= MAX_TEST_FILES) {
fprintf(stderr, "Error: maximum number of system test files exceded\n");
exit(1);
}
if (access(file, F_OK)) {
// no such file
return;
}
char *fname = strdup(file);
if (!fname)
errExit("strdup");
tf[files_cnt].tfile = fname;
files_cnt++;
}
void sysfiles_test(void) {
// I am root in sandbox mount namespace
assert(user_uid);
int i;
pid_t child = fork();
if (child == -1)
errExit("fork");
if (child == 0) { // child
// drop privileges
if (setgid(user_gid) != 0)
errExit("setgid");
if (setuid(user_uid) != 0)
errExit("setuid");
for (i = 0; i < files_cnt; i++) {
assert(tf[i].tfile);
// try to open the file for reading
FILE *fp = fopen(tf[i].tfile, "r");
if (fp) {
printf(" Warning: I can access %s\n", tf[i].tfile);
fclose(fp);
}
}
exit(0);
}
// wait for the child to finish
int status;
wait(&status);
}
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