3 # Taint tests by Tom Phoenix <rootbeer@teleport.com>.
5 # I don't claim to know all about tainting. If anyone sees
6 # tests that I've missed here, please add them. But this is
7 # better than having no tests at all, right?
20 # We do not want the whole taint.t to fail
21 # just because Errno possibly failing.
22 eval { require Errno; import Errno };
24 use vars qw($ipcsysv); # did we manage to load IPC::SysV?
27 if ($^O eq 'VMS' && !defined($Config{d_setenv})) {
28 $ENV{PATH} = $ENV{PATH};
29 $ENV{TERM} = $ENV{TERM} ne ''? $ENV{TERM} : 'dummy';
31 if ($Config{'extensions'} =~ /\bIPC\/SysV\b/
32 && ($Config{d_shm} || $Config{d_msg})) {
33 eval { require IPC::SysV };
36 IPC::SysV->import(qw(IPC_PRIVATE IPC_RMID IPC_CREAT S_IRWXU));
41 my $Is_VMS = $^O eq 'VMS';
42 my $Is_MSWin32 = $^O eq 'MSWin32';
43 my $Is_NetWare = $^O eq 'NetWare';
44 my $Is_Dos = $^O eq 'dos';
45 my $Is_Cygwin = $^O eq 'cygwin';
46 my $Invoke_Perl = $Is_VMS ? 'MCR Sys$Disk:[]Perl.' :
47 ($Is_MSWin32 ? '.\perl' :
48 ($Is_NetWare ? 'perl' : './perl'));
49 my @MoreEnv = qw/IFS CDPATH ENV BASH_ENV/;
53 for $x ('DCL$PATH', @MoreEnv) {
54 ($old{$x}) = $ENV{$x} =~ /^(.*)$/ if exists $ENV{$x};
58 \$ENV{PATH} = '' if $Config{d_setenv};
59 warn "# Note: logical name 'PATH' may have been deleted\n";
60 \@ENV{keys %old} = values %old;
66 # The empty tainted value, for tainting strings
67 my $TAINT = substr($^X, 0, 0);
68 # A tainted zero, useful for tainting numbers
69 my $TAINT0 = 0 + $TAINT;
71 # This taints each argument passed. All must be lvalues.
72 # Side effect: It also stringifies them. :-(
74 for (@_) { $_ .= $TAINT }
77 # How to identify taint when you see it
79 not eval { join("",@_), kill 0; 1 };
85 for (@_) { return 0 unless tainted $_ }
90 my($serial, $boolean, $diag) = @_;
94 print "not ok $serial\n";
95 for (split m/^/m, $diag) {
100 or substr($diag, -1) eq "\n";
104 # We need an external program to call.
105 my $ECHO = ($Is_MSWin32 ? ".\\echo$$" : ($Is_NetWare ? "echo$$" : "./echo$$"));
107 open PROG, "> $ECHO" or die "Can't create $ECHO: $!";
108 print PROG 'print "@ARGV\n"', "\n";
110 my $echo = "$Invoke_Perl $ECHO";
114 # First, let's make sure that Perl is checking the dangerous
115 # environment variables. Maybe they aren't set yet, so we'll
116 # taint them ourselves.
118 $ENV{'DCL$PATH'} = '' if $Is_VMS;
121 delete @ENV{@MoreEnv};
125 system("/usr/bin/cp /usr/bin/cygwin1.dll .") &&
126 die "$0: failed to cp cygwin1.dll: $!\n";
127 END { unlink "cygwin1.dll" } # yes, done for all platforms...
130 test 1, eval { `$echo 1` } eq "1\n";
132 if ($Is_MSWin32 || $Is_NetWare || $Is_VMS || $Is_Dos) {
133 print "# Environment tainting tests skipped\n";
134 for (2..5) { print "ok $_\n" }
137 my @vars = ('PATH', @MoreEnv);
138 while (my $v = $vars[0]) {
139 local $ENV{$v} = $TAINT;
140 last if eval { `$echo 1` };
141 last unless $@ =~ /^Insecure \$ENV{$v}/;
144 test 2, !@vars, "\$$vars[0]";
146 # tainted $TERM is unsafe only if it contains metachars
148 $ENV{TERM} = 'e=mc2';
149 test 3, eval { `$echo 1` } eq "1\n";
150 $ENV{TERM} = 'e=mc2' . $TAINT;
151 test 4, eval { `$echo 1` } eq '';
152 test 5, $@ =~ /^Insecure \$ENV{TERM}/, $@;
156 if ($^O eq 'os2' || $^O eq 'amigaos' || $Is_MSWin32 || $Is_NetWare || $Is_Dos) {
157 print "# all directories are writeable\n";
160 $tmp = (grep { defined and -d and (stat _)[2] & 2 }
161 qw(sys$scratch /tmp /var/tmp /usr/tmp),
162 @ENV{qw(TMP TEMP)})[0]
163 or print "# can't find world-writeable directory to test PATH\n";
167 local $ENV{PATH} = $tmp;
168 test 6, eval { `$echo 1` } eq '';
169 test 7, $@ =~ /^Insecure directory in \$ENV{PATH}/, $@;
172 for (6..7) { print "ok $_ # Skipped: all directories are writeable\n" }
176 $ENV{'DCL$PATH'} = $TAINT;
177 test 8, eval { `$echo 1` } eq '';
178 test 9, $@ =~ /^Insecure \$ENV{DCL\$PATH}/, $@;
180 $ENV{'DCL$PATH'} = $tmp;
181 test 10, eval { `$echo 1` } eq '';
182 test 11, $@ =~ /^Insecure directory in \$ENV{DCL\$PATH}/, $@;
185 for (10..11) { print "ok $_ # Skipped: can't find world-writeable directory to test DCL\$PATH\n" }
187 $ENV{'DCL$PATH'} = '';
190 for (8..11) { print "ok $_ # Skipped: This is not VMS\n"; }
194 # Let's see that we can taint and untaint as needed.
197 test 12, tainted $foo;
199 # That was a sanity check. If it failed, stop the insanity!
200 die "Taint checks don't seem to be enabled" unless tainted $foo;
203 test 13, not tainted $foo;
206 test 14, tainted $foo;
209 test 15, not any_tainted @list;
210 taint_these @list[1,3,5,7,9];
211 test 16, any_tainted @list;
212 test 17, all_tainted @list[1,3,5,7,9];
213 test 18, not any_tainted @list[0,2,4,6,8];
215 ($foo) = $foo =~ /(.+)/;
216 test 19, not tainted $foo;
218 $foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
219 test 20, not tainted $foo;
220 test 21, $foo eq 'bar';
225 ($foo) = ('bar' . $TAINT) =~ /(.+)/;
226 test 22, tainted $foo;
227 test 23, $foo eq 'bar';
229 $foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
230 test 24, tainted $foo;
231 test 25, $foo eq 'bar';
234 $foo = $1 if 'bar' =~ /(.+)$TAINT/;
235 test 26, tainted $foo;
236 test 27, $foo eq 'bar';
238 my $pi = 4 * atan2(1,1) + $TAINT0;
239 test 28, tainted $pi;
241 ($pi) = $pi =~ /(\d+\.\d+)/;
242 test 29, not tainted $pi;
243 test 30, sprintf("%.5f", $pi) eq '3.14159';
246 # How about command-line arguments? The problem is that we don't
247 # always get some, so we'll run another process with some.
250 open PROG, "> $arg" or die "Can't create $arg: $!";
252 eval { join('', @ARGV), kill 0 };
253 exit 0 if $@ =~ /^Insecure dependency/;
254 print "# Oops: \$@ was [$@]\n";
258 print `$Invoke_Perl "-T" $arg and some suspect arguments`;
259 test 31, !$?, "Exited with status $?";
263 # Reading from a file should be tainted
266 test 32, open(FILE, $file), "Couldn't open '$file': $!";
269 sysread(FILE, $block, 100);
272 test 33, tainted $block;
273 test 34, tainted $line;
276 # Globs should be forbidden, except under VMS,
277 # which doesn't spawn an external program.
278 if (1 # built-in glob
280 for (35..36) { print "ok $_\n"; }
283 my @globs = eval { <*> };
284 test 35, @globs == 0 && $@ =~ /^Insecure dependency/;
286 @globs = eval { glob '*' };
287 test 36, @globs == 0 && $@ =~ /^Insecure dependency/;
290 # Output of commands should be tainted
292 my $foo = `$echo abc`;
293 test 37, tainted $foo;
296 # Certain system variables should be tainted
298 test 38, all_tainted $^X, $0;
301 # Results of matching should all be untainted
303 my $foo = "abcdefghi" . $TAINT;
304 test 39, tainted $foo;
307 test 40, not any_tainted $`, $&, $';
309 $foo =~ /(...)(...)(...)/;
310 test 41, not any_tainted $1, $2, $3, $+;
312 my @bar = $foo =~ /(...)(...)(...)/;
313 test 42, not any_tainted @bar;
315 test 43, tainted $foo; # $foo should still be tainted!
316 test 44, $foo eq "abcdefghi";
319 # Operations which affect files can't use tainted data.
321 test 45, eval { chmod 0, $TAINT } eq '', 'chmod';
322 test 46, $@ =~ /^Insecure dependency/, $@;
324 # There is no feature test in $Config{} for truncate,
325 # so we allow for the possibility that it's missing.
326 test 47, eval { truncate 'NoSuChFiLe', $TAINT0 } eq '', 'truncate';
327 test 48, $@ =~ /^(?:Insecure dependency|truncate not implemented)/, $@;
329 test 49, eval { rename '', $TAINT } eq '', 'rename';
330 test 50, $@ =~ /^Insecure dependency/, $@;
332 test 51, eval { unlink $TAINT } eq '', 'unlink';
333 test 52, $@ =~ /^Insecure dependency/, $@;
335 test 53, eval { utime $TAINT } eq '', 'utime';
336 test 54, $@ =~ /^Insecure dependency/, $@;
338 if ($Config{d_chown}) {
339 test 55, eval { chown -1, -1, $TAINT } eq '', 'chown';
340 test 56, $@ =~ /^Insecure dependency/, $@;
343 for (55..56) { print "ok $_ # Skipped: chown() is not available\n" }
346 if ($Config{d_link}) {
347 test 57, eval { link $TAINT, '' } eq '', 'link';
348 test 58, $@ =~ /^Insecure dependency/, $@;
351 for (57..58) { print "ok $_ # Skipped: link() is not available\n" }
354 if ($Config{d_symlink}) {
355 test 59, eval { symlink $TAINT, '' } eq '', 'symlink';
356 test 60, $@ =~ /^Insecure dependency/, $@;
359 for (59..60) { print "ok $_ # Skipped: symlink() is not available\n" }
363 # Operations which affect directories can't use tainted data.
365 test 61, eval { mkdir $TAINT0, $TAINT } eq '', 'mkdir';
366 test 62, $@ =~ /^Insecure dependency/, $@;
368 test 63, eval { rmdir $TAINT } eq '', 'rmdir';
369 test 64, $@ =~ /^Insecure dependency/, $@;
371 test 65, eval { chdir $TAINT } eq '', 'chdir';
372 test 66, $@ =~ /^Insecure dependency/, $@;
374 if ($Config{d_chroot}) {
375 test 67, eval { chroot $TAINT } eq '', 'chroot';
376 test 68, $@ =~ /^Insecure dependency/, $@;
379 for (67..68) { print "ok $_ # Skipped: chroot() is not available\n" }
383 # Some operations using files can't use tainted data.
385 my $foo = "imaginary library" . $TAINT;
386 test 69, eval { require $foo } eq '', 'require';
387 test 70, $@ =~ /^Insecure dependency/, $@;
389 my $filename = "./taintB$$"; # NB: $filename isn't tainted!
390 END { unlink $filename if defined $filename }
391 $foo = $filename . $TAINT;
392 unlink $filename; # in any case
394 test 71, eval { open FOO, $foo } eq '', 'open for read';
395 test 72, $@ eq '', $@; # NB: This should be allowed
397 # Try first new style but allow also old style.
398 test 73, $!{ENOENT} ||
399 $! == 2 || # File not found
400 ($Is_Dos && $! == 22) ||
401 ($^O eq 'mint' && $! == 33);
403 test 74, eval { open FOO, "> $foo" } eq '', 'open for write';
404 test 75, $@ =~ /^Insecure dependency/, $@;
407 # Commands to the system can't use tainted data
411 if ($^O eq 'amigaos') {
412 for (76..79) { print "ok $_ # Skipped: open('|') is not available\n" }
415 test 76, eval { open FOO, "| x$foo" } eq '', 'popen to';
416 test 77, $@ =~ /^Insecure dependency/, $@;
418 test 78, eval { open FOO, "x$foo |" } eq '', 'popen from';
419 test 79, $@ =~ /^Insecure dependency/, $@;
422 test 80, eval { exec $TAINT } eq '', 'exec';
423 test 81, $@ =~ /^Insecure dependency/, $@;
425 test 82, eval { system $TAINT } eq '', 'system';
426 test 83, $@ =~ /^Insecure dependency/, $@;
431 test 84, eval { `$echo 1$foo` } eq '', 'backticks';
432 test 85, $@ =~ /^Insecure dependency/, $@;
434 if ($Is_VMS) { # wildcard expansion doesn't invoke shell, so is safe
435 test 86, join('', eval { glob $foo } ) ne '', 'globbing';
436 test 87, $@ eq '', $@;
439 for (86..87) { print "ok $_ # Skipped: this is not VMS\n"; }
443 # Operations which affect processes can't use tainted data.
445 test 88, eval { kill 0, $TAINT } eq '', 'kill';
446 test 89, $@ =~ /^Insecure dependency/, $@;
448 if ($Config{d_setpgrp}) {
449 test 90, eval { setpgrp 0, $TAINT } eq '', 'setpgrp';
450 test 91, $@ =~ /^Insecure dependency/, $@;
453 for (90..91) { print "ok $_ # Skipped: setpgrp() is not available\n" }
456 if ($Config{d_setprior}) {
457 test 92, eval { setpriority 0, $TAINT, $TAINT } eq '', 'setpriority';
458 test 93, $@ =~ /^Insecure dependency/, $@;
461 for (92..93) { print "ok $_ # Skipped: setpriority() is not available\n" }
465 # Some miscellaneous operations can't use tainted data.
467 if ($Config{d_syscall}) {
468 test 94, eval { syscall $TAINT } eq '', 'syscall';
469 test 95, $@ =~ /^Insecure dependency/, $@;
472 for (94..95) { print "ok $_ # Skipped: syscall() is not available\n" }
479 my $temp = "./taintC$$";
481 test 96, open(FOO, "> $temp"), "Couldn't open $temp for write: $!";
483 test 97, eval { ioctl FOO, $TAINT, $foo } eq '', 'ioctl';
484 test 98, $@ =~ /^Insecure dependency/, $@;
486 if ($Config{d_fcntl}) {
487 test 99, eval { fcntl FOO, $TAINT, $foo } eq '', 'fcntl';
488 test 100, $@ =~ /^Insecure dependency/, $@;
491 for (99..100) { print "ok $_ # Skipped: fcntl() is not available\n" }
498 # Some tests involving references
500 my $foo = 'abc' . $TAINT;
502 test 101, not tainted $fooref;
503 test 102, tainted $$fooref;
504 test 103, tainted $foo;
507 # Some tests involving assignment
511 test 104, all_tainted $foo, $bar;
512 test 105, tainted($foo = $bar);
513 test 106, tainted($bar = $bar);
514 test 107, tainted($bar += $bar);
515 test 108, tainted($bar -= $bar);
516 test 109, tainted($bar *= $bar);
517 test 110, tainted($bar++);
518 test 111, tainted($bar /= $bar);
519 test 112, tainted($bar += 0);
520 test 113, tainted($bar -= 2);
521 test 114, tainted($bar *= -1);
522 test 115, tainted($bar /= 1);
523 test 116, tainted($bar--);
527 # Test assignment and return of lists
529 my @foo = ("A", "tainted" . $TAINT, "B");
530 test 118, not tainted $foo[0];
531 test 119, tainted $foo[1];
532 test 120, not tainted $foo[2];
534 test 121, not tainted $bar[0];
535 test 122, tainted $bar[1];
536 test 123, not tainted $bar[2];
537 my @baz = eval { "A", "tainted" . $TAINT, "B" };
538 test 124, not tainted $baz[0];
539 test 125, tainted $baz[1];
540 test 126, not tainted $baz[2];
541 my @plugh = eval q[ "A", "tainted" . $TAINT, "B" ];
542 test 127, not tainted $plugh[0];
543 test 128, tainted $plugh[1];
544 test 129, not tainted $plugh[2];
545 my $nautilus = sub { "A", "tainted" . $TAINT, "B" };
546 test 130, not tainted ((&$nautilus)[0]);
547 test 131, tainted ((&$nautilus)[1]);
548 test 132, not tainted ((&$nautilus)[2]);
549 my @xyzzy = &$nautilus;
550 test 133, not tainted $xyzzy[0];
551 test 134, tainted $xyzzy[1];
552 test 135, not tainted $xyzzy[2];
553 my $red_october = sub { return "A", "tainted" . $TAINT, "B" };
554 test 136, not tainted ((&$red_october)[0]);
555 test 137, tainted ((&$red_october)[1]);
556 test 138, not tainted ((&$red_october)[2]);
557 my @corge = &$red_october;
558 test 139, not tainted $corge[0];
559 test 140, tainted $corge[1];
560 test 141, not tainted $corge[2];
563 # Test for system/library calls returning string data of dubious origin.
565 # No reliable %Config check for getpw*
566 if (eval { setpwent(); getpwent(); 1 }) {
568 my @getpwent = getpwent();
569 die "getpwent: $!\n" unless (@getpwent);
570 test 142,( not tainted $getpwent[0]
571 and tainted $getpwent[1]
572 and not tainted $getpwent[2]
573 and not tainted $getpwent[3]
574 and not tainted $getpwent[4]
575 and not tainted $getpwent[5]
576 and tainted $getpwent[6] # ge?cos
577 and not tainted $getpwent[7]
578 and tainted $getpwent[8]); # shell
581 for (142) { print "ok $_ # Skipped: getpwent() is not available\n" }
584 if ($Config{d_readdir}) { # pretty hard to imagine not
586 opendir(D, "op") or die "opendir: $!\n";
587 my $readdir = readdir(D);
588 test 143, tainted $readdir;
591 for (143) { print "ok $_ # Skipped: readdir() is not available\n" }
594 if ($Config{d_readlink} && $Config{d_symlink}) {
595 my $symlink = "sl$$";
597 symlink("/something/naughty", $symlink) or die "symlink: $!\n";
598 my $readlink = readlink($symlink);
599 test 144, tainted $readlink;
602 for (144) { print "ok $_ # Skipped: readlink() or symlink() is not available\n"; }
606 # test bitwise ops (regression bug)
610 test 145, not tainted $j;
613 test 146, tainted $j;
616 # test target of substitution (regression bug)
618 my $why = $TAINT."y";
620 test 147, tainted $why;
624 test 148, tainted $why;
626 $why =~ s/e/'-'.$$/ge;
627 test 149, tainted $why;
633 print "ok 150 # skipped: no IPC::SysV\n";
636 if ($Config{'extensions'} =~ /\bIPC\/SysV\b/ && $Config{d_shm}) {
641 my $id = shmget(IPC_PRIVATE, $size, S_IRWXU);
644 if (shmwrite($id, $sent, 0, 60)) {
645 if (shmread($id, $rcvd, 0, 60)) {
646 substr($rcvd, index($rcvd, "\0")) = '';
648 warn "# shmread failed: $!\n";
651 warn "# shmwrite failed: $!\n";
653 shmctl($id, IPC_RMID, 0) or warn "# shmctl failed: $!\n";
655 warn "# shmget failed: $!\n";
658 if ($rcvd eq $sent) {
659 test 150, tainted $rcvd;
661 print "ok 150 # Skipped: SysV shared memory operation failed\n";
664 print "ok 150 # Skipped: SysV shared memory is not available\n";
671 print "ok 151 # skipped: no IPC::SysV\n";
674 if ($Config{'extensions'} =~ /\bIPC\/SysV\b/ && $Config{d_msg}) {
676 my $id = msgget(IPC_PRIVATE, IPC_CREAT | S_IRWXU);
678 my $sent = "message";
679 my $type_sent = 1234;
684 if (msgsnd($id, pack("l! a*", $type_sent, $sent), 0)) {
685 if (msgrcv($id, $rcvd, 60, 0, 0)) {
686 ($type_rcvd, $rcvd) = unpack("l! a*", $rcvd);
688 warn "# msgrcv failed\n";
691 warn "# msgsnd failed\n";
693 msgctl($id, IPC_RMID, 0) or warn "# msgctl failed: $!\n";
695 warn "# msgget failed\n";
698 if ($rcvd eq $sent && $type_sent == $type_rcvd) {
699 test 151, tainted $rcvd;
701 print "ok 151 # Skipped: SysV message queue operation failed\n";
704 print "ok 151 # Skipped: SysV message queues are not available\n";
709 # bug id 20001004.006
711 open IN, "./TEST" or warn "$0: cannot read ./TEST: $!" ;
715 print "not " unless tainted($a) && tainted($b) && !defined($b);
721 # bug id 20001004.007
723 open IN, "./TEST" or warn "$0: cannot read ./TEST: $!" ;
728 print "not " unless !tainted($c->{a}) && tainted($c->{b});
733 print "not " unless tainted($d->{a}) && !tainted($d->{b});
737 b => { c => $a, d => 42 } };
738 print "not " unless !tainted($e->{a}) &&
740 tainted($e->{b}->{c}) &&
741 !tainted($e->{b}->{d});
748 # bug id 20010519.003
751 use vars qw($has_fcntl);
752 eval { require Fcntl; import Fcntl; };
758 unless ($has_fcntl) {
760 print "ok $_ # Skip: no Fcntl (no dynaloading?)\n";
763 my $evil = "foo" . $TAINT;
765 eval { sysopen(my $ro, $evil, &O_RDONLY) };
766 test 156, $@ !~ /^Insecure dependency/, $@;
768 eval { sysopen(my $wo, $evil, &O_WRONLY) };
769 test 157, $@ =~ /^Insecure dependency/, $@;
771 eval { sysopen(my $rw, $evil, &O_RDWR) };
772 test 158, $@ =~ /^Insecure dependency/, $@;
774 eval { sysopen(my $ap, $evil, &O_APPEND) };
775 test 159, $@ =~ /^Insecure dependency/, $@;
777 eval { sysopen(my $cr, $evil, &O_CREAT) };
778 test 160, $@ =~ /^Insecure dependency/, $@;
780 eval { sysopen(my $tr, $evil, &O_TRUNC) };
781 test 161, $@ =~ /^Insecure dependency/, $@;
783 eval { sysopen(my $ro, "foo", &O_RDONLY | $evil) };
784 test 162, $@ !~ /^Insecure dependency/, $@;
786 eval { sysopen(my $wo, "foo", &O_WRONLY | $evil) };
787 test 163, $@ =~ /^Insecure dependency/, $@;
789 eval { sysopen(my $rw, "foo", &O_RDWR | $evil) };
790 test 164, $@ =~ /^Insecure dependency/, $@;
792 eval { sysopen(my $ap, "foo", &O_APPEND | $evil) };
793 test 165, $@ =~ /^Insecure dependency/, $@;
795 eval { sysopen(my $cr, "foo", &O_CREAT | $evil) };
796 test 166, $@ =~ /^Insecure dependency/, $@;
798 eval { sysopen(my $tr, "foo", &O_TRUNC | $evil) };
799 test 167, $@ =~ /^Insecure dependency/, $@;
801 eval { sysopen(my $ro, "foo", &O_RDONLY, $evil) };
802 test 168, $@ !~ /^Insecure dependency/, $@;
804 eval { sysopen(my $wo, "foo", &O_WRONLY, $evil) };
805 test 169, $@ =~ /^Insecure dependency/, $@;
807 eval { sysopen(my $rw, "foo", &O_RDWR, $evil) };
808 test 170, $@ =~ /^Insecure dependency/, $@;
810 eval { sysopen(my $ap, "foo", &O_APPEND, $evil) };
811 test 171, $@ =~ /^Insecure dependency/, $@;
813 eval { sysopen(my $cr, "foo", &O_CREAT, $evil) };
814 test 172, $@ =~ /^Insecure dependency/, $@;
816 eval { sysopen(my $tr, "foo", &O_TRUNC, $evil) };
817 test 173, $@ =~ /^Insecure dependency/, $@;
819 unlink("foo"); # not unlink($evil), because that would fail...
828 $SIG{__WARN__} = sub { print "not " };
831 my $divnum = shift()/1;
832 sprintf("%1.1f\n", $divnum);