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?
12 unshift @INC, '../lib' if -d '../lib';
18 # We do not want the whole taint.t to fail
19 # just because Errno possibly failing.
20 eval { require Errno; import Errno };
23 if ($^O eq 'VMS' && !defined($Config{d_setenv})) {
24 $ENV{PATH} = $ENV{PATH};
25 $ENV{TERM} = $ENV{TERM} ne ''? $ENV{TERM} : 'dummy';
27 if ($Config{d_shm} || $Config{d_msg}) {
29 IPC::SysV->import(qw(IPC_PRIVATE IPC_RMID IPC_CREAT S_IRWXU));
33 my $Is_VMS = $^O eq 'VMS';
34 my $Is_MSWin32 = $^O eq 'MSWin32';
35 my $Is_Dos = $^O eq 'dos';
36 my $Invoke_Perl = $Is_VMS ? 'MCR Sys$Disk:[]Perl.' :
37 $Is_MSWin32 ? '.\perl' : './perl';
38 my @MoreEnv = qw/IFS CDPATH ENV BASH_ENV/;
42 for $x ('DCL$PATH', @MoreEnv) {
43 ($old{$x}) = $ENV{$x} =~ /^(.*)$/ if exists $ENV{$x};
47 \$ENV{PATH} = '' if $Config{d_setenv};
48 warn "# Note: logical name 'PATH' may have been deleted\n";
49 \@ENV{keys %old} = values %old;
55 # The empty tainted value, for tainting strings
56 my $TAINT = substr($^X, 0, 0);
57 # A tainted zero, useful for tainting numbers
58 my $TAINT0 = 0 + $TAINT;
60 # This taints each argument passed. All must be lvalues.
61 # Side effect: It also stringifies them. :-(
63 for (@_) { $_ .= $TAINT }
66 # How to identify taint when you see it
68 not eval { join("",@_), kill 0; 1 };
74 for (@_) { return 0 unless tainted $_ }
79 my($serial, $boolean, $diag) = @_;
83 print "not ok $serial\n";
84 for (split m/^/m, $diag) {
89 or substr($diag, -1) eq "\n";
93 # We need an external program to call.
94 my $ECHO = ($Is_MSWin32 ? ".\\echo$$" : "./echo$$");
96 open PROG, "> $ECHO" or die "Can't create $ECHO: $!";
97 print PROG 'print "@ARGV\n"', "\n";
99 my $echo = "$Invoke_Perl $ECHO";
103 # First, let's make sure that Perl is checking the dangerous
104 # environment variables. Maybe they aren't set yet, so we'll
105 # taint them ourselves.
107 $ENV{'DCL$PATH'} = '' if $Is_VMS;
110 delete @ENV{@MoreEnv};
113 test 1, eval { `$echo 1` } eq "1\n";
115 if ($Is_MSWin32 || $Is_VMS || $Is_Dos) {
116 print "# Environment tainting tests skipped\n";
117 for (2..5) { print "ok $_\n" }
120 my @vars = ('PATH', @MoreEnv);
121 while (my $v = $vars[0]) {
122 local $ENV{$v} = $TAINT;
123 last if eval { `$echo 1` };
124 last unless $@ =~ /^Insecure \$ENV{$v}/;
127 test 2, !@vars, "\$$vars[0]";
129 # tainted $TERM is unsafe only if it contains metachars
131 $ENV{TERM} = 'e=mc2';
132 test 3, eval { `$echo 1` } eq "1\n";
133 $ENV{TERM} = 'e=mc2' . $TAINT;
134 test 4, eval { `$echo 1` } eq '';
135 test 5, $@ =~ /^Insecure \$ENV{TERM}/, $@;
139 if ($^O eq 'os2' || $^O eq 'amigaos' || $Is_MSWin32 || $Is_Dos) {
140 print "# all directories are writeable\n";
143 $tmp = (grep { defined and -d and (stat _)[2] & 2 }
144 qw(sys$scratch /tmp /var/tmp /usr/tmp),
145 @ENV{qw(TMP TEMP)})[0]
146 or print "# can't find world-writeable directory to test PATH\n";
150 local $ENV{PATH} = $tmp;
151 test 6, eval { `$echo 1` } eq '';
152 test 7, $@ =~ /^Insecure directory in \$ENV{PATH}/, $@;
155 for (6..7) { print "ok $_ # Skipped: all directories are writeable\n" }
159 $ENV{'DCL$PATH'} = $TAINT;
160 test 8, eval { `$echo 1` } eq '';
161 test 9, $@ =~ /^Insecure \$ENV{DCL\$PATH}/, $@;
163 $ENV{'DCL$PATH'} = $tmp;
164 test 10, eval { `$echo 1` } eq '';
165 test 11, $@ =~ /^Insecure directory in \$ENV{DCL\$PATH}/, $@;
168 for (10..11) { print "ok $_ # Skipped: can't find world-writeable directory to test DCL\$PATH\n" }
170 $ENV{'DCL$PATH'} = '';
173 for (8..11) { print "ok $_ # Skipped: This is not VMS\n"; }
177 # Let's see that we can taint and untaint as needed.
180 test 12, tainted $foo;
182 # That was a sanity check. If it failed, stop the insanity!
183 die "Taint checks don't seem to be enabled" unless tainted $foo;
186 test 13, not tainted $foo;
189 test 14, tainted $foo;
192 test 15, not any_tainted @list;
193 taint_these @list[1,3,5,7,9];
194 test 16, any_tainted @list;
195 test 17, all_tainted @list[1,3,5,7,9];
196 test 18, not any_tainted @list[0,2,4,6,8];
198 ($foo) = $foo =~ /(.+)/;
199 test 19, not tainted $foo;
201 $foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
202 test 20, not tainted $foo;
203 test 21, $foo eq 'bar';
208 ($foo) = ('bar' . $TAINT) =~ /(.+)/;
209 test 22, tainted $foo;
210 test 23, $foo eq 'bar';
212 $foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
213 test 24, tainted $foo;
214 test 25, $foo eq 'bar';
217 $foo = $1 if 'bar' =~ /(.+)$TAINT/;
218 test 26, tainted $foo;
219 test 27, $foo eq 'bar';
221 my $pi = 4 * atan2(1,1) + $TAINT0;
222 test 28, tainted $pi;
224 ($pi) = $pi =~ /(\d+\.\d+)/;
225 test 29, not tainted $pi;
226 test 30, sprintf("%.5f", $pi) eq '3.14159';
229 # How about command-line arguments? The problem is that we don't
230 # always get some, so we'll run another process with some.
233 open PROG, "> $arg" or die "Can't create $arg: $!";
235 eval { join('', @ARGV), kill 0 };
236 exit 0 if $@ =~ /^Insecure dependency/;
237 print "# Oops: \$@ was [$@]\n";
241 print `$Invoke_Perl "-T" $arg and some suspect arguments`;
242 test 31, !$?, "Exited with status $?";
246 # Reading from a file should be tainted
249 test 32, open(FILE, $file), "Couldn't open '$file': $!";
252 sysread(FILE, $block, 100);
255 test 33, tainted $block;
256 test 34, tainted $line;
259 # Globs should be forbidden, except under VMS,
260 # which doesn't spawn an external program.
261 if (1 # built-in glob
263 for (35..36) { print "ok $_\n"; }
266 my @globs = eval { <*> };
267 test 35, @globs == 0 && $@ =~ /^Insecure dependency/;
269 @globs = eval { glob '*' };
270 test 36, @globs == 0 && $@ =~ /^Insecure dependency/;
273 # Output of commands should be tainted
275 my $foo = `$echo abc`;
276 test 37, tainted $foo;
279 # Certain system variables should be tainted
281 test 38, all_tainted $^X, $0;
284 # Results of matching should all be untainted
286 my $foo = "abcdefghi" . $TAINT;
287 test 39, tainted $foo;
290 test 40, not any_tainted $`, $&, $';
292 $foo =~ /(...)(...)(...)/;
293 test 41, not any_tainted $1, $2, $3, $+;
295 my @bar = $foo =~ /(...)(...)(...)/;
296 test 42, not any_tainted @bar;
298 test 43, tainted $foo; # $foo should still be tainted!
299 test 44, $foo eq "abcdefghi";
302 # Operations which affect files can't use tainted data.
304 test 45, eval { chmod 0, $TAINT } eq '', 'chmod';
305 test 46, $@ =~ /^Insecure dependency/, $@;
307 # There is no feature test in $Config{} for truncate,
308 # so we allow for the possibility that it's missing.
309 test 47, eval { truncate 'NoSuChFiLe', $TAINT0 } eq '', 'truncate';
310 test 48, $@ =~ /^(?:Insecure dependency|truncate not implemented)/, $@;
312 test 49, eval { rename '', $TAINT } eq '', 'rename';
313 test 50, $@ =~ /^Insecure dependency/, $@;
315 test 51, eval { unlink $TAINT } eq '', 'unlink';
316 test 52, $@ =~ /^Insecure dependency/, $@;
318 test 53, eval { utime $TAINT } eq '', 'utime';
319 test 54, $@ =~ /^Insecure dependency/, $@;
321 if ($Config{d_chown}) {
322 test 55, eval { chown -1, -1, $TAINT } eq '', 'chown';
323 test 56, $@ =~ /^Insecure dependency/, $@;
326 for (55..56) { print "ok $_ # Skipped: chown() is not available\n" }
329 if ($Config{d_link}) {
330 test 57, eval { link $TAINT, '' } eq '', 'link';
331 test 58, $@ =~ /^Insecure dependency/, $@;
334 for (57..58) { print "ok $_ # Skipped: link() is not available\n" }
337 if ($Config{d_symlink}) {
338 test 59, eval { symlink $TAINT, '' } eq '', 'symlink';
339 test 60, $@ =~ /^Insecure dependency/, $@;
342 for (59..60) { print "ok $_ # Skipped: symlink() is not available\n" }
346 # Operations which affect directories can't use tainted data.
348 test 61, eval { mkdir $TAINT0, $TAINT } eq '', 'mkdir';
349 test 62, $@ =~ /^Insecure dependency/, $@;
351 test 63, eval { rmdir $TAINT } eq '', 'rmdir';
352 test 64, $@ =~ /^Insecure dependency/, $@;
354 test 65, eval { chdir $TAINT } eq '', 'chdir';
355 test 66, $@ =~ /^Insecure dependency/, $@;
357 if ($Config{d_chroot}) {
358 test 67, eval { chroot $TAINT } eq '', 'chroot';
359 test 68, $@ =~ /^Insecure dependency/, $@;
362 for (67..68) { print "ok $_ # Skipped: chroot() is not available\n" }
366 # Some operations using files can't use tainted data.
368 my $foo = "imaginary library" . $TAINT;
369 test 69, eval { require $foo } eq '', 'require';
370 test 70, $@ =~ /^Insecure dependency/, $@;
372 my $filename = "./taintB$$"; # NB: $filename isn't tainted!
373 END { unlink $filename if defined $filename }
374 $foo = $filename . $TAINT;
375 unlink $filename; # in any case
377 test 71, eval { open FOO, $foo } eq '', 'open for read';
378 test 72, $@ eq '', $@; # NB: This should be allowed
380 # Try first new style but allow also old style.
381 test 73, $!{ENOENT} ||
382 $! == 2 || # File not found
383 ($Is_Dos && $! == 22) ||
384 ($^O eq 'mint' && $! == 33);
386 test 74, eval { open FOO, "> $foo" } eq '', 'open for write';
387 test 75, $@ =~ /^Insecure dependency/, $@;
390 # Commands to the system can't use tainted data
394 if ($^O eq 'amigaos') {
395 for (76..79) { print "ok $_ # Skipped: open('|') is not available\n" }
398 test 76, eval { open FOO, "| x$foo" } eq '', 'popen to';
399 test 77, $@ =~ /^Insecure dependency/, $@;
401 test 78, eval { open FOO, "x$foo |" } eq '', 'popen from';
402 test 79, $@ =~ /^Insecure dependency/, $@;
405 test 80, eval { exec $TAINT } eq '', 'exec';
406 test 81, $@ =~ /^Insecure dependency/, $@;
408 test 82, eval { system $TAINT } eq '', 'system';
409 test 83, $@ =~ /^Insecure dependency/, $@;
414 test 84, eval { `$echo 1$foo` } eq '', 'backticks';
415 test 85, $@ =~ /^Insecure dependency/, $@;
417 if ($Is_VMS) { # wildcard expansion doesn't invoke shell, so is safe
418 test 86, join('', eval { glob $foo } ) ne '', 'globbing';
419 test 87, $@ eq '', $@;
422 for (86..87) { print "ok $_ # Skipped: this is not VMS\n"; }
426 # Operations which affect processes can't use tainted data.
428 test 88, eval { kill 0, $TAINT } eq '', 'kill';
429 test 89, $@ =~ /^Insecure dependency/, $@;
431 if ($Config{d_setpgrp}) {
432 test 90, eval { setpgrp 0, $TAINT } eq '', 'setpgrp';
433 test 91, $@ =~ /^Insecure dependency/, $@;
436 for (90..91) { print "ok $_ # Skipped: setpgrp() is not available\n" }
439 if ($Config{d_setprior}) {
440 test 92, eval { setpriority 0, $TAINT, $TAINT } eq '', 'setpriority';
441 test 93, $@ =~ /^Insecure dependency/, $@;
444 for (92..93) { print "ok $_ # Skipped: setpriority() is not available\n" }
448 # Some miscellaneous operations can't use tainted data.
450 if ($Config{d_syscall}) {
451 test 94, eval { syscall $TAINT } eq '', 'syscall';
452 test 95, $@ =~ /^Insecure dependency/, $@;
455 for (94..95) { print "ok $_ # Skipped: syscall() is not available\n" }
462 my $temp = "./taintC$$";
464 test 96, open(FOO, "> $temp"), "Couldn't open $temp for write: $!";
466 test 97, eval { ioctl FOO, $TAINT, $foo } eq '', 'ioctl';
467 test 98, $@ =~ /^Insecure dependency/, $@;
469 if ($Config{d_fcntl}) {
470 test 99, eval { fcntl FOO, $TAINT, $foo } eq '', 'fcntl';
471 test 100, $@ =~ /^Insecure dependency/, $@;
474 for (99..100) { print "ok $_ # Skipped: fcntl() is not available\n" }
481 # Some tests involving references
483 my $foo = 'abc' . $TAINT;
485 test 101, not tainted $fooref;
486 test 102, tainted $$fooref;
487 test 103, tainted $foo;
490 # Some tests involving assignment
494 test 104, all_tainted $foo, $bar;
495 test 105, tainted($foo = $bar);
496 test 106, tainted($bar = $bar);
497 test 107, tainted($bar += $bar);
498 test 108, tainted($bar -= $bar);
499 test 109, tainted($bar *= $bar);
500 test 110, tainted($bar++);
501 test 111, tainted($bar /= $bar);
502 test 112, tainted($bar += 0);
503 test 113, tainted($bar -= 2);
504 test 114, tainted($bar *= -1);
505 test 115, tainted($bar /= 1);
506 test 116, tainted($bar--);
510 # Test assignment and return of lists
512 my @foo = ("A", "tainted" . $TAINT, "B");
513 test 118, not tainted $foo[0];
514 test 119, tainted $foo[1];
515 test 120, not tainted $foo[2];
517 test 121, not tainted $bar[0];
518 test 122, tainted $bar[1];
519 test 123, not tainted $bar[2];
520 my @baz = eval { "A", "tainted" . $TAINT, "B" };
521 test 124, not tainted $baz[0];
522 test 125, tainted $baz[1];
523 test 126, not tainted $baz[2];
524 my @plugh = eval q[ "A", "tainted" . $TAINT, "B" ];
525 test 127, not tainted $plugh[0];
526 test 128, tainted $plugh[1];
527 test 129, not tainted $plugh[2];
528 my $nautilus = sub { "A", "tainted" . $TAINT, "B" };
529 test 130, not tainted ((&$nautilus)[0]);
530 test 131, tainted ((&$nautilus)[1]);
531 test 132, not tainted ((&$nautilus)[2]);
532 my @xyzzy = &$nautilus;
533 test 133, not tainted $xyzzy[0];
534 test 134, tainted $xyzzy[1];
535 test 135, not tainted $xyzzy[2];
536 my $red_october = sub { return "A", "tainted" . $TAINT, "B" };
537 test 136, not tainted ((&$red_october)[0]);
538 test 137, tainted ((&$red_october)[1]);
539 test 138, not tainted ((&$red_october)[2]);
540 my @corge = &$red_october;
541 test 139, not tainted $corge[0];
542 test 140, tainted $corge[1];
543 test 141, not tainted $corge[2];
546 # Test for system/library calls returning string data of dubious origin.
548 # No reliable %Config check for getpw*
549 if (eval { setpwent(); getpwent(); 1 }) {
551 my @getpwent = getpwent();
552 die "getpwent: $!\n" unless (@getpwent);
553 test 142,( not tainted $getpwent[0]
554 and tainted $getpwent[1]
555 and not tainted $getpwent[2]
556 and not tainted $getpwent[3]
557 and not tainted $getpwent[4]
558 and not tainted $getpwent[5]
559 and tainted $getpwent[6] # ge?cos
560 and not tainted $getpwent[7]
561 and tainted $getpwent[8]); # shell
564 for (142) { print "ok $_ # Skipped: getpwent() is not available\n" }
567 if ($Config{d_readdir}) { # pretty hard to imagine not
569 opendir(D, "op") or die "opendir: $!\n";
570 my $readdir = readdir(D);
571 test 143, tainted $readdir;
574 for (143) { print "ok $_ # Skipped: readdir() is not available\n" }
577 if ($Config{d_readlink} && $Config{d_symlink}) {
578 my $symlink = "sl$$";
580 symlink("/something/naughty", $symlink) or die "symlink: $!\n";
581 my $readlink = readlink($symlink);
582 test 144, tainted $readlink;
585 for (144) { print "ok $_ # Skipped: readlink() or symlink() is not available\n"; }
589 # test bitwise ops (regression bug)
593 test 145, not tainted $j;
596 test 146, tainted $j;
599 # test target of substitution (regression bug)
601 my $why = $TAINT."y";
603 test 147, tainted $why;
607 test 148, tainted $why;
609 $why =~ s/e/'-'.$$/ge;
610 test 149, tainted $why;
615 if ($Config{d_shm}) {
620 my $id = shmget(IPC_PRIVATE, $size, S_IRWXU) ||
621 warn "# shmget failed: $!\n";
623 if (shmwrite($id, $sent, 0, 60)) {
624 if (shmread($id, $rcvd, 0, 60)) {
625 substr($rcvd, index($rcvd, "\0")) = '';
627 warn "# shmread failed: $!\n";
630 warn "# shmwrite failed: $!\n";
632 shmctl($id, IPC_RMID, 0) || warn "# shmctl failed: $!\n";
634 warn "# shmget failed: $!\n";
637 if ($rcvd eq $sent) {
638 test 150, tainted $rcvd;
640 print "ok 150 # Skipped: SysV shared memory operation failed\n";
643 print "ok 150 # Skipped: SysV shared memory is not available\n";
649 if ($Config{d_msg}) {
651 my $id = msgget(IPC_PRIVATE, IPC_CREAT | S_IRWXU);
653 my $sent = "message";
654 my $type_sent = 1234;
659 if (msgsnd($id, pack("l! a*", $type_sent, $sent), 0)) {
660 if (msgrcv($id, $rcvd, 60, 0, 0)) {
661 ($type_rcvd, $rcvd) = unpack("l! a*", $rcvd);
663 warn "# msgrcv failed\n";
666 warn "# msgsnd failed\n";
668 msgctl($id, IPC_RMID, 0) || warn "# msgctl failed: $!\n";
670 warn "# msgget failed\n";
673 if ($rcvd eq $sent && $type_sent == $type_rcvd) {
674 test 151, tainted $rcvd;
676 print "ok 151 # Skipped: SysV message queue operation failed\n";
679 print "ok 151 # Skipped: SysV message queues are not available\n";