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/*
* Written by Thierry Vignaud,
* heavilly modified for msec purpose by Vandoorselaere Yoann.
*
* This code is copyrighted by Mandriva [(c) 2000] and is released under
* the GPL licence
*/
/*
* TODO
* +++ hash tables or btree to stock already searched uid/gid for speed
* Pb: since linux-2.3.4x, uid & gid are 32 bits wide ... => BTREE?
* static char **uid_hash, **gid_hash;
*
* +++ check for open & I/O error on log files ...
* --- disable 'cannot stat ...' warning (???) => better log them SECURITY_LOG
* --- disable write test on links => OK
*/
/*
* (Vandoorselaere Yoann)
* Done :
* - Don't handle FTW_DNR case, since it will print warning for /proc file.
* - Don't walk trought /dev & /proc.
* - We don't need to handle all of the ftw flag, just the FTW_F & FTW_D one :)
* - Use FTW_PHYS to not follow symbolic link.
* - Do not use getenv to get the root directory.
* - Use argv instead of a DIR variable to get directory to scan.
* - Free directory after use when allocated for appending a '/'.
*/
#include <stdlib.h>
#include <stdio.h>
#define __USE_XOPEN_EXTENDED
#define __USE_GNU
#include <ftw.h>
#include <sys/stat.h>
/* For NSS managment */
#include <pwd.h>
#include <grp.h>
#include <sys/types.h>
#include <regex.h>
#include <string.h>
#ifdef __GNUC__
#define inline
#else
#warning upgrade your so-called system to a real OS such as GNU/Linux
#endif
/*
* Log files
*/
static FILE *suid_fd;
static FILE *sgid_fd;
static FILE *unowned_user_fd;
static FILE *unowned_group_fd;
static FILE *writable_fd;
static regex_t exclude_regexp;
static int use_regexp = 0;
static int traverse(const char *file, const struct stat *sb, int flag, struct FTW *s)
{
struct passwd *u_nss_data;
struct group *g_nss_data;
/*
* handle bogus glibc ftw
* else we won't print only one '/' in front of file names
*/
if (strncmp(file, "//", 2) == 0 )
file++;
/*
* Don't walk throught /dev & /proc
*/
if ( (strncmp("/proc", file, 5) == 0) ||
(strncmp("/dev", file, 4) == 0) ||
(strncmp("/sys", file, 4) == 0) )
return FTW_SKIP_SUBTREE;
if (use_regexp && (regexec(&exclude_regexp, file, 0, NULL, 0) == 0))
return FTW_SKIP_SUBTREE;
switch (flag) {
/*
* Regular file handling.
*/
case FTW_F:
/*
* Is suid root check.
*/
if ((sb->st_mode & S_ISUID) && (sb->st_uid == 0))
fprintf(suid_fd, "%s\n", file);
/*
* Is suid group check.
*/
if (sb->st_mode & S_ISGID)
fprintf(sgid_fd, "%s\n", file);
/*
* Their is no break statement here, it is normal.
* Directory handing.
*/
case FTW_D:
/*
* Is world writable check.
*/
if ((sb->st_mode & 0002) && !(S_ISSOCK(sb->st_mode)) && !(S_ISFIFO(sb->st_mode))
&& !(S_ISCHR(sb->st_mode)) && !(S_ISBLK(sb->st_mode)) && !((sb->st_mode & S_ISVTX) == S_ISVTX))
fprintf(writable_fd, "%s\n", file);
/*
* Unowned user check.
*/
u_nss_data = getpwuid(sb->st_uid);
if (u_nss_data == NULL)
fprintf(unowned_user_fd, "%s\n", file);
/*
* Unowned group check.
*/
g_nss_data = getgrgid(sb->st_gid);
if (g_nss_data == NULL)
fprintf(unowned_group_fd, "%s\n", file);
break;
}
return 0;
}
/* This function opens all log files */
__inline__ static void init()
{
static const char *mode = "w+";
char *env;
suid_fd = fopen(getenv("SUID_ROOT_TODAY"), mode);
if ( ! suid_fd ) {
perror("fopen (suid_root_today)");
exit(1);
}
sgid_fd = fopen(getenv("SGID_TODAY"), mode);
if ( ! sgid_fd ) {
perror("fopen (sgid_today)");
exit(1);
}
writable_fd = fopen(getenv("WRITABLE_TODAY"), mode);
if ( ! writable_fd ) {
perror("fopen (writable_today)");
exit(1);
}
unowned_user_fd = fopen(getenv("UNOWNED_USER_TODAY"), mode);
if ( ! unowned_user_fd ) {
perror("fopen (unowned_user_today)");
exit(1);
}
unowned_group_fd = fopen(getenv("UNOWNED_GROUP_TODAY"), mode);
if ( ! unowned_group_fd ) {
perror("fopen (unowned_group_today)");
exit(1);
}
env = getenv("EXCLUDE_REGEXP");
if (env) {
if (regcomp(&exclude_regexp, env, 0) == 0) {
use_regexp = 1;
} else {
fprintf(stderr, "Unable to compile EXCLUDE_REGEXP '%s'\n", env);
exit(1);
}
}
}
int main(int argc, char **argv)
{
char *directory;
int res = 0, i;
int ctrl = 0;
if ( argc < 2 ) {
fprintf(stderr, "Please give directory as argument.\n");
fprintf(stderr, "%s /usr/sbin /sbin\n\n", argv[0]);
exit(1);
}
/* open all log files */
init();
for ( i = 1; i < argc; i++ ) {
if ( strcmp(argv[i], "/") != 0) {
/*
* We need to add a final '/' to the base directory name else the
* FTW_MOUNT option of nftw won't work. i.e. : /mnt/cdrom is on the /
* fs (it is the directory on which a CD is mounted) whereas
* /mnt/cdrom/ is the mounted directory.
* Hopefully, find has the same "bug"
*/
ctrl = 1;
directory = ( char * ) malloc((strlen(argv[i]) + 2));
if ( ! directory ) {
perror("malloc");
exit(1);
}
strcpy(directory, argv[i]);
strcat(directory, "/");
} else {
directory = argv[i];
}
res = nftw(directory, traverse, 200, FTW_PHYS | FTW_MOUNT | FTW_ACTIONRETVAL);
if ( ctrl ) {
free(directory);
ctrl = 0;
}
}
/*
* close all log files
*/
fclose(suid_fd);
fclose(sgid_fd);
fclose(writable_fd);
fclose(unowned_user_fd);
fclose(unowned_group_fd);
exit(res);
}
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