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_Dos = $^O eq 'dos';
44 my $Invoke_Perl = $Is_VMS ? 'MCR Sys$Disk:[]Perl.' :
45 $Is_MSWin32 ? '.\perl' : './perl';
46 my @MoreEnv = qw/IFS CDPATH ENV BASH_ENV/;
50 for $x ('DCL$PATH', @MoreEnv) {
51 ($old{$x}) = $ENV{$x} =~ /^(.*)$/ if exists $ENV{$x};
55 \$ENV{PATH} = '' if $Config{d_setenv};
56 warn "# Note: logical name 'PATH' may have been deleted\n";
57 \@ENV{keys %old} = values %old;
63 # The empty tainted value, for tainting strings
64 my $TAINT = substr($^X, 0, 0);
65 # A tainted zero, useful for tainting numbers
66 my $TAINT0 = 0 + $TAINT;
68 # This taints each argument passed. All must be lvalues.
69 # Side effect: It also stringifies them. :-(
71 for (@_) { $_ .= $TAINT }
74 # How to identify taint when you see it
76 not eval { join("",@_), kill 0; 1 };
82 for (@_) { return 0 unless tainted $_ }
87 my($serial, $boolean, $diag) = @_;
91 print "not ok $serial\n";
92 for (split m/^/m, $diag) {
97 or substr($diag, -1) eq "\n";
101 # We need an external program to call.
102 my $ECHO = ($Is_MSWin32 ? ".\\echo$$" : "./echo$$");
104 open PROG, "> $ECHO" or die "Can't create $ECHO: $!";
105 print PROG 'print "@ARGV\n"', "\n";
107 my $echo = "$Invoke_Perl $ECHO";
111 # First, let's make sure that Perl is checking the dangerous
112 # environment variables. Maybe they aren't set yet, so we'll
113 # taint them ourselves.
115 $ENV{'DCL$PATH'} = '' if $Is_VMS;
118 delete @ENV{@MoreEnv};
121 test 1, eval { `$echo 1` } eq "1\n";
123 if ($Is_MSWin32 || $Is_VMS || $Is_Dos) {
124 print "# Environment tainting tests skipped\n";
125 for (2..5) { print "ok $_\n" }
128 my @vars = ('PATH', @MoreEnv);
129 while (my $v = $vars[0]) {
130 local $ENV{$v} = $TAINT;
131 last if eval { `$echo 1` };
132 last unless $@ =~ /^Insecure \$ENV{$v}/;
135 test 2, !@vars, "\$$vars[0]";
137 # tainted $TERM is unsafe only if it contains metachars
139 $ENV{TERM} = 'e=mc2';
140 test 3, eval { `$echo 1` } eq "1\n";
141 $ENV{TERM} = 'e=mc2' . $TAINT;
142 test 4, eval { `$echo 1` } eq '';
143 test 5, $@ =~ /^Insecure \$ENV{TERM}/, $@;
147 if ($^O eq 'os2' || $^O eq 'amigaos' || $Is_MSWin32 || $Is_Dos) {
148 print "# all directories are writeable\n";
151 $tmp = (grep { defined and -d and (stat _)[2] & 2 }
152 qw(sys$scratch /tmp /var/tmp /usr/tmp),
153 @ENV{qw(TMP TEMP)})[0]
154 or print "# can't find world-writeable directory to test PATH\n";
158 local $ENV{PATH} = $tmp;
159 test 6, eval { `$echo 1` } eq '';
160 test 7, $@ =~ /^Insecure directory in \$ENV{PATH}/, $@;
163 for (6..7) { print "ok $_ # Skipped: all directories are writeable\n" }
167 $ENV{'DCL$PATH'} = $TAINT;
168 test 8, eval { `$echo 1` } eq '';
169 test 9, $@ =~ /^Insecure \$ENV{DCL\$PATH}/, $@;
171 $ENV{'DCL$PATH'} = $tmp;
172 test 10, eval { `$echo 1` } eq '';
173 test 11, $@ =~ /^Insecure directory in \$ENV{DCL\$PATH}/, $@;
176 for (10..11) { print "ok $_ # Skipped: can't find world-writeable directory to test DCL\$PATH\n" }
178 $ENV{'DCL$PATH'} = '';
181 for (8..11) { print "ok $_ # Skipped: This is not VMS\n"; }
185 # Let's see that we can taint and untaint as needed.
188 test 12, tainted $foo;
190 # That was a sanity check. If it failed, stop the insanity!
191 die "Taint checks don't seem to be enabled" unless tainted $foo;
194 test 13, not tainted $foo;
197 test 14, tainted $foo;
200 test 15, not any_tainted @list;
201 taint_these @list[1,3,5,7,9];
202 test 16, any_tainted @list;
203 test 17, all_tainted @list[1,3,5,7,9];
204 test 18, not any_tainted @list[0,2,4,6,8];
206 ($foo) = $foo =~ /(.+)/;
207 test 19, not tainted $foo;
209 $foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
210 test 20, not tainted $foo;
211 test 21, $foo eq 'bar';
216 ($foo) = ('bar' . $TAINT) =~ /(.+)/;
217 test 22, tainted $foo;
218 test 23, $foo eq 'bar';
220 $foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
221 test 24, tainted $foo;
222 test 25, $foo eq 'bar';
225 $foo = $1 if 'bar' =~ /(.+)$TAINT/;
226 test 26, tainted $foo;
227 test 27, $foo eq 'bar';
229 my $pi = 4 * atan2(1,1) + $TAINT0;
230 test 28, tainted $pi;
232 ($pi) = $pi =~ /(\d+\.\d+)/;
233 test 29, not tainted $pi;
234 test 30, sprintf("%.5f", $pi) eq '3.14159';
237 # How about command-line arguments? The problem is that we don't
238 # always get some, so we'll run another process with some.
241 open PROG, "> $arg" or die "Can't create $arg: $!";
243 eval { join('', @ARGV), kill 0 };
244 exit 0 if $@ =~ /^Insecure dependency/;
245 print "# Oops: \$@ was [$@]\n";
249 print `$Invoke_Perl "-T" $arg and some suspect arguments`;
250 test 31, !$?, "Exited with status $?";
254 # Reading from a file should be tainted
257 test 32, open(FILE, $file), "Couldn't open '$file': $!";
260 sysread(FILE, $block, 100);
263 test 33, tainted $block;
264 test 34, tainted $line;
267 # Globs should be forbidden, except under VMS,
268 # which doesn't spawn an external program.
269 if (1 # built-in glob
271 for (35..36) { print "ok $_\n"; }
274 my @globs = eval { <*> };
275 test 35, @globs == 0 && $@ =~ /^Insecure dependency/;
277 @globs = eval { glob '*' };
278 test 36, @globs == 0 && $@ =~ /^Insecure dependency/;
281 # Output of commands should be tainted
283 my $foo = `$echo abc`;
284 test 37, tainted $foo;
287 # Certain system variables should be tainted
289 test 38, all_tainted $^X, $0;
292 # Results of matching should all be untainted
294 my $foo = "abcdefghi" . $TAINT;
295 test 39, tainted $foo;
298 test 40, not any_tainted $`, $&, $';
300 $foo =~ /(...)(...)(...)/;
301 test 41, not any_tainted $1, $2, $3, $+;
303 my @bar = $foo =~ /(...)(...)(...)/;
304 test 42, not any_tainted @bar;
306 test 43, tainted $foo; # $foo should still be tainted!
307 test 44, $foo eq "abcdefghi";
310 # Operations which affect files can't use tainted data.
312 test 45, eval { chmod 0, $TAINT } eq '', 'chmod';
313 test 46, $@ =~ /^Insecure dependency/, $@;
315 # There is no feature test in $Config{} for truncate,
316 # so we allow for the possibility that it's missing.
317 test 47, eval { truncate 'NoSuChFiLe', $TAINT0 } eq '', 'truncate';
318 test 48, $@ =~ /^(?:Insecure dependency|truncate not implemented)/, $@;
320 test 49, eval { rename '', $TAINT } eq '', 'rename';
321 test 50, $@ =~ /^Insecure dependency/, $@;
323 test 51, eval { unlink $TAINT } eq '', 'unlink';
324 test 52, $@ =~ /^Insecure dependency/, $@;
326 test 53, eval { utime $TAINT } eq '', 'utime';
327 test 54, $@ =~ /^Insecure dependency/, $@;
329 if ($Config{d_chown}) {
330 test 55, eval { chown -1, -1, $TAINT } eq '', 'chown';
331 test 56, $@ =~ /^Insecure dependency/, $@;
334 for (55..56) { print "ok $_ # Skipped: chown() is not available\n" }
337 if ($Config{d_link}) {
338 test 57, eval { link $TAINT, '' } eq '', 'link';
339 test 58, $@ =~ /^Insecure dependency/, $@;
342 for (57..58) { print "ok $_ # Skipped: link() is not available\n" }
345 if ($Config{d_symlink}) {
346 test 59, eval { symlink $TAINT, '' } eq '', 'symlink';
347 test 60, $@ =~ /^Insecure dependency/, $@;
350 for (59..60) { print "ok $_ # Skipped: symlink() is not available\n" }
354 # Operations which affect directories can't use tainted data.
356 test 61, eval { mkdir $TAINT0, $TAINT } eq '', 'mkdir';
357 test 62, $@ =~ /^Insecure dependency/, $@;
359 test 63, eval { rmdir $TAINT } eq '', 'rmdir';
360 test 64, $@ =~ /^Insecure dependency/, $@;
362 test 65, eval { chdir $TAINT } eq '', 'chdir';
363 test 66, $@ =~ /^Insecure dependency/, $@;
365 if ($Config{d_chroot}) {
366 test 67, eval { chroot $TAINT } eq '', 'chroot';
367 test 68, $@ =~ /^Insecure dependency/, $@;
370 for (67..68) { print "ok $_ # Skipped: chroot() is not available\n" }
374 # Some operations using files can't use tainted data.
376 my $foo = "imaginary library" . $TAINT;
377 test 69, eval { require $foo } eq '', 'require';
378 test 70, $@ =~ /^Insecure dependency/, $@;
380 my $filename = "./taintB$$"; # NB: $filename isn't tainted!
381 END { unlink $filename if defined $filename }
382 $foo = $filename . $TAINT;
383 unlink $filename; # in any case
385 test 71, eval { open FOO, $foo } eq '', 'open for read';
386 test 72, $@ eq '', $@; # NB: This should be allowed
388 # Try first new style but allow also old style.
389 test 73, $!{ENOENT} ||
390 $! == 2 || # File not found
391 ($Is_Dos && $! == 22) ||
392 ($^O eq 'mint' && $! == 33);
394 test 74, eval { open FOO, "> $foo" } eq '', 'open for write';
395 test 75, $@ =~ /^Insecure dependency/, $@;
398 # Commands to the system can't use tainted data
402 if ($^O eq 'amigaos') {
403 for (76..79) { print "ok $_ # Skipped: open('|') is not available\n" }
406 test 76, eval { open FOO, "| x$foo" } eq '', 'popen to';
407 test 77, $@ =~ /^Insecure dependency/, $@;
409 test 78, eval { open FOO, "x$foo |" } eq '', 'popen from';
410 test 79, $@ =~ /^Insecure dependency/, $@;
413 test 80, eval { exec $TAINT } eq '', 'exec';
414 test 81, $@ =~ /^Insecure dependency/, $@;
416 test 82, eval { system $TAINT } eq '', 'system';
417 test 83, $@ =~ /^Insecure dependency/, $@;
422 test 84, eval { `$echo 1$foo` } eq '', 'backticks';
423 test 85, $@ =~ /^Insecure dependency/, $@;
425 if ($Is_VMS) { # wildcard expansion doesn't invoke shell, so is safe
426 test 86, join('', eval { glob $foo } ) ne '', 'globbing';
427 test 87, $@ eq '', $@;
430 for (86..87) { print "ok $_ # Skipped: this is not VMS\n"; }
434 # Operations which affect processes can't use tainted data.
436 test 88, eval { kill 0, $TAINT } eq '', 'kill';
437 test 89, $@ =~ /^Insecure dependency/, $@;
439 if ($Config{d_setpgrp}) {
440 test 90, eval { setpgrp 0, $TAINT } eq '', 'setpgrp';
441 test 91, $@ =~ /^Insecure dependency/, $@;
444 for (90..91) { print "ok $_ # Skipped: setpgrp() is not available\n" }
447 if ($Config{d_setprior}) {
448 test 92, eval { setpriority 0, $TAINT, $TAINT } eq '', 'setpriority';
449 test 93, $@ =~ /^Insecure dependency/, $@;
452 for (92..93) { print "ok $_ # Skipped: setpriority() is not available\n" }
456 # Some miscellaneous operations can't use tainted data.
458 if ($Config{d_syscall}) {
459 test 94, eval { syscall $TAINT } eq '', 'syscall';
460 test 95, $@ =~ /^Insecure dependency/, $@;
463 for (94..95) { print "ok $_ # Skipped: syscall() is not available\n" }
470 my $temp = "./taintC$$";
472 test 96, open(FOO, "> $temp"), "Couldn't open $temp for write: $!";
474 test 97, eval { ioctl FOO, $TAINT, $foo } eq '', 'ioctl';
475 test 98, $@ =~ /^Insecure dependency/, $@;
477 if ($Config{d_fcntl}) {
478 test 99, eval { fcntl FOO, $TAINT, $foo } eq '', 'fcntl';
479 test 100, $@ =~ /^Insecure dependency/, $@;
482 for (99..100) { print "ok $_ # Skipped: fcntl() is not available\n" }
489 # Some tests involving references
491 my $foo = 'abc' . $TAINT;
493 test 101, not tainted $fooref;
494 test 102, tainted $$fooref;
495 test 103, tainted $foo;
498 # Some tests involving assignment
502 test 104, all_tainted $foo, $bar;
503 test 105, tainted($foo = $bar);
504 test 106, tainted($bar = $bar);
505 test 107, tainted($bar += $bar);
506 test 108, tainted($bar -= $bar);
507 test 109, tainted($bar *= $bar);
508 test 110, tainted($bar++);
509 test 111, tainted($bar /= $bar);
510 test 112, tainted($bar += 0);
511 test 113, tainted($bar -= 2);
512 test 114, tainted($bar *= -1);
513 test 115, tainted($bar /= 1);
514 test 116, tainted($bar--);
518 # Test assignment and return of lists
520 my @foo = ("A", "tainted" . $TAINT, "B");
521 test 118, not tainted $foo[0];
522 test 119, tainted $foo[1];
523 test 120, not tainted $foo[2];
525 test 121, not tainted $bar[0];
526 test 122, tainted $bar[1];
527 test 123, not tainted $bar[2];
528 my @baz = eval { "A", "tainted" . $TAINT, "B" };
529 test 124, not tainted $baz[0];
530 test 125, tainted $baz[1];
531 test 126, not tainted $baz[2];
532 my @plugh = eval q[ "A", "tainted" . $TAINT, "B" ];
533 test 127, not tainted $plugh[0];
534 test 128, tainted $plugh[1];
535 test 129, not tainted $plugh[2];
536 my $nautilus = sub { "A", "tainted" . $TAINT, "B" };
537 test 130, not tainted ((&$nautilus)[0]);
538 test 131, tainted ((&$nautilus)[1]);
539 test 132, not tainted ((&$nautilus)[2]);
540 my @xyzzy = &$nautilus;
541 test 133, not tainted $xyzzy[0];
542 test 134, tainted $xyzzy[1];
543 test 135, not tainted $xyzzy[2];
544 my $red_october = sub { return "A", "tainted" . $TAINT, "B" };
545 test 136, not tainted ((&$red_october)[0]);
546 test 137, tainted ((&$red_october)[1]);
547 test 138, not tainted ((&$red_october)[2]);
548 my @corge = &$red_october;
549 test 139, not tainted $corge[0];
550 test 140, tainted $corge[1];
551 test 141, not tainted $corge[2];
554 # Test for system/library calls returning string data of dubious origin.
556 # No reliable %Config check for getpw*
557 if (eval { setpwent(); getpwent(); 1 }) {
559 my @getpwent = getpwent();
560 die "getpwent: $!\n" unless (@getpwent);
561 test 142,( not tainted $getpwent[0]
562 and tainted $getpwent[1]
563 and not tainted $getpwent[2]
564 and not tainted $getpwent[3]
565 and not tainted $getpwent[4]
566 and not tainted $getpwent[5]
567 and tainted $getpwent[6] # ge?cos
568 and not tainted $getpwent[7]
569 and tainted $getpwent[8]); # shell
572 for (142) { print "ok $_ # Skipped: getpwent() is not available\n" }
575 if ($Config{d_readdir}) { # pretty hard to imagine not
577 opendir(D, "op") or die "opendir: $!\n";
578 my $readdir = readdir(D);
579 test 143, tainted $readdir;
582 for (143) { print "ok $_ # Skipped: readdir() is not available\n" }
585 if ($Config{d_readlink} && $Config{d_symlink}) {
586 my $symlink = "sl$$";
588 symlink("/something/naughty", $symlink) or die "symlink: $!\n";
589 my $readlink = readlink($symlink);
590 test 144, tainted $readlink;
593 for (144) { print "ok $_ # Skipped: readlink() or symlink() is not available\n"; }
597 # test bitwise ops (regression bug)
601 test 145, not tainted $j;
604 test 146, tainted $j;
607 # test target of substitution (regression bug)
609 my $why = $TAINT."y";
611 test 147, tainted $why;
615 test 148, tainted $why;
617 $why =~ s/e/'-'.$$/ge;
618 test 149, tainted $why;
624 print "ok 150 # skipped: no IPC::SysV\n";
627 if ($Config{'extensions'} =~ /\bIPC\/SysV\b/ && $Config{d_shm}) {
632 my $id = shmget(IPC_PRIVATE, $size, S_IRWXU);
635 if (shmwrite($id, $sent, 0, 60)) {
636 if (shmread($id, $rcvd, 0, 60)) {
637 substr($rcvd, index($rcvd, "\0")) = '';
639 warn "# shmread failed: $!\n";
642 warn "# shmwrite failed: $!\n";
644 shmctl($id, IPC_RMID, 0) or warn "# shmctl failed: $!\n";
646 warn "# shmget failed: $!\n";
649 if ($rcvd eq $sent) {
650 test 150, tainted $rcvd;
652 print "ok 150 # Skipped: SysV shared memory operation failed\n";
655 print "ok 150 # Skipped: SysV shared memory is not available\n";
662 print "ok 151 # skipped: no IPC::SysV\n";
665 if ($Config{'extensions'} =~ /\bIPC\/SysV\b/ && $Config{d_msg}) {
667 my $id = msgget(IPC_PRIVATE, IPC_CREAT | S_IRWXU);
669 my $sent = "message";
670 my $type_sent = 1234;
675 if (msgsnd($id, pack("l! a*", $type_sent, $sent), 0)) {
676 if (msgrcv($id, $rcvd, 60, 0, 0)) {
677 ($type_rcvd, $rcvd) = unpack("l! a*", $rcvd);
679 warn "# msgrcv failed\n";
682 warn "# msgsnd failed\n";
684 msgctl($id, IPC_RMID, 0) or warn "# msgctl failed: $!\n";
686 warn "# msgget failed\n";
689 if ($rcvd eq $sent && $type_sent == $type_rcvd) {
690 test 151, tainted $rcvd;
692 print "ok 151 # Skipped: SysV message queue operation failed\n";
695 print "ok 151 # Skipped: SysV message queues are not available\n";
700 # bug id 20001004.006
702 open IN, "./TEST" or warn "$0: cannot read ./TEST: $!" ;
706 print "not " unless tainted($a) && tainted($b) && !defined($b);
712 # bug id 20001004.007
714 open IN, "./TEST" or warn "$0: cannot read ./TEST: $!" ;
719 print "not " unless !tainted($c->{a}) && tainted($c->{b});
724 print "not " unless tainted($d->{a}) && !tainted($d->{b});
728 b => { c => $a, d => 42 } };
729 print "not " unless !tainted($e->{a}) &&
731 tainted($e->{b}->{c}) &&
732 !tainted($e->{b}->{d});