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';
29 my $Is_VMS = $^O eq 'VMS';
30 my $Is_MSWin32 = $^O eq 'MSWin32';
31 my $Is_Dos = $^O eq 'dos';
32 my $Invoke_Perl = $Is_VMS ? 'MCR Sys$Disk:[]Perl.' :
33 $Is_MSWin32 ? '.\perl' : './perl';
34 my @MoreEnv = qw/IFS CDPATH ENV BASH_ENV/;
38 for $x ('DCL$PATH', @MoreEnv) {
39 ($old{$x}) = $ENV{$x} =~ /^(.*)$/ if exists $ENV{$x};
43 \$ENV{PATH} = '' if $Config{d_setenv};
44 warn "# Note: logical name 'PATH' may have been deleted\n";
45 \@ENV{keys %old} = values %old;
51 # The empty tainted value, for tainting strings
52 my $TAINT = substr($^X, 0, 0);
53 # A tainted zero, useful for tainting numbers
54 my $TAINT0 = 0 + $TAINT;
56 # This taints each argument passed. All must be lvalues.
57 # Side effect: It also stringifies them. :-(
59 for (@_) { $_ .= $TAINT }
62 # How to identify taint when you see it
64 not eval { join("",@_), kill 0; 1 };
70 for (@_) { return 0 unless tainted $_ }
75 my($serial, $boolean, $diag) = @_;
79 print "not ok $serial\n";
80 for (split m/^/m, $diag) {
85 or substr($diag, -1) eq "\n";
89 # We need an external program to call.
90 my $ECHO = ($Is_MSWin32 ? ".\\echo$$" : "./echo$$");
92 open PROG, "> $ECHO" or die "Can't create $ECHO: $!";
93 print PROG 'print "@ARGV\n"', "\n";
95 my $echo = "$Invoke_Perl $ECHO";
99 # First, let's make sure that Perl is checking the dangerous
100 # environment variables. Maybe they aren't set yet, so we'll
101 # taint them ourselves.
103 $ENV{'DCL$PATH'} = '' if $Is_VMS;
106 delete @ENV{@MoreEnv};
109 test 1, eval { `$echo 1` } eq "1\n";
111 if ($Is_MSWin32 || $Is_VMS || $Is_Dos) {
112 print "# Environment tainting tests skipped\n";
113 for (2..5) { print "ok $_\n" }
116 my @vars = ('PATH', @MoreEnv);
117 while (my $v = $vars[0]) {
118 local $ENV{$v} = $TAINT;
119 last if eval { `$echo 1` };
120 last unless $@ =~ /^Insecure \$ENV{$v}/;
123 test 2, !@vars, "\$$vars[0]";
125 # tainted $TERM is unsafe only if it contains metachars
127 $ENV{TERM} = 'e=mc2';
128 test 3, eval { `$echo 1` } eq "1\n";
129 $ENV{TERM} = 'e=mc2' . $TAINT;
130 test 4, eval { `$echo 1` } eq '';
131 test 5, $@ =~ /^Insecure \$ENV{TERM}/, $@;
135 if ($^O eq 'os2' || $^O eq 'amigaos' || $Is_MSWin32 || $Is_Dos) {
136 print "# all directories are writeable\n";
139 $tmp = (grep { defined and -d and (stat _)[2] & 2 }
140 qw(/tmp /var/tmp /usr/tmp /sys$scratch),
141 @ENV{qw(TMP TEMP)})[0]
142 or print "# can't find world-writeable directory to test PATH\n";
146 local $ENV{PATH} = $tmp;
147 test 6, eval { `$echo 1` } eq '';
148 test 7, $@ =~ /^Insecure directory in \$ENV{PATH}/, $@;
151 for (6..7) { print "ok $_ # Skipped: all directories are writeable\n" }
155 $ENV{'DCL$PATH'} = $TAINT;
156 test 8, eval { `$echo 1` } eq '';
157 test 9, $@ =~ /^Insecure \$ENV{DCL\$PATH}/, $@;
159 $ENV{'DCL$PATH'} = $tmp;
160 test 10, eval { `$echo 1` } eq '';
161 test 11, $@ =~ /^Insecure directory in \$ENV{DCL\$PATH}/, $@;
164 for (10..11) { print "ok $_ # Skipped: can't find world-writeable directory to test DCL\$PATH\n" }
166 $ENV{'DCL$PATH'} = '';
169 for (8..11) { print "ok $_ # Skipped: This is not VMS\n"; }
173 # Let's see that we can taint and untaint as needed.
176 test 12, tainted $foo;
178 # That was a sanity check. If it failed, stop the insanity!
179 die "Taint checks don't seem to be enabled" unless tainted $foo;
182 test 13, not tainted $foo;
185 test 14, tainted $foo;
188 test 15, not any_tainted @list;
189 taint_these @list[1,3,5,7,9];
190 test 16, any_tainted @list;
191 test 17, all_tainted @list[1,3,5,7,9];
192 test 18, not any_tainted @list[0,2,4,6,8];
194 ($foo) = $foo =~ /(.+)/;
195 test 19, not tainted $foo;
197 $foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
198 test 20, not tainted $foo;
199 test 21, $foo eq 'bar';
204 ($foo) = ('bar' . $TAINT) =~ /(.+)/;
205 test 22, tainted $foo;
206 test 23, $foo eq 'bar';
208 $foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
209 test 24, tainted $foo;
210 test 25, $foo eq 'bar';
213 $foo = $1 if 'bar' =~ /(.+)$TAINT/;
214 test 26, tainted $foo;
215 test 27, $foo eq 'bar';
217 my $pi = 4 * atan2(1,1) + $TAINT0;
218 test 28, tainted $pi;
220 ($pi) = $pi =~ /(\d+\.\d+)/;
221 test 29, not tainted $pi;
222 test 30, sprintf("%.5f", $pi) eq '3.14159';
225 # How about command-line arguments? The problem is that we don't
226 # always get some, so we'll run another process with some.
229 open PROG, "> $arg" or die "Can't create $arg: $!";
231 eval { join('', @ARGV), kill 0 };
232 exit 0 if $@ =~ /^Insecure dependency/;
233 print "# Oops: \$@ was [$@]\n";
237 print `$Invoke_Perl "-T" $arg and some suspect arguments`;
238 test 31, !$?, "Exited with status $?";
242 # Reading from a file should be tainted
245 test 32, open(FILE, $file), "Couldn't open '$file': $!";
248 sysread(FILE, $block, 100);
251 test 33, tainted $block;
252 test 34, tainted $line;
255 # Globs should be forbidden, except under VMS,
256 # which doesn't spawn an external program.
258 for (35..36) { print "ok $_\n"; }
261 my @globs = eval { <*> };
262 test 35, @globs == 0 && $@ =~ /^Insecure dependency/;
264 @globs = eval { glob '*' };
265 test 36, @globs == 0 && $@ =~ /^Insecure dependency/;
268 # Output of commands should be tainted
270 my $foo = `$echo abc`;
271 test 37, tainted $foo;
274 # Certain system variables should be tainted
276 test 38, all_tainted $^X, $0;
279 # Results of matching should all be untainted
281 my $foo = "abcdefghi" . $TAINT;
282 test 39, tainted $foo;
285 test 40, not any_tainted $`, $&, $';
287 $foo =~ /(...)(...)(...)/;
288 test 41, not any_tainted $1, $2, $3, $+;
290 my @bar = $foo =~ /(...)(...)(...)/;
291 test 42, not any_tainted @bar;
293 test 43, tainted $foo; # $foo should still be tainted!
294 test 44, $foo eq "abcdefghi";
297 # Operations which affect files can't use tainted data.
299 test 45, eval { chmod 0, $TAINT } eq '', 'chmod';
300 test 46, $@ =~ /^Insecure dependency/, $@;
302 # There is no feature test in $Config{} for truncate,
303 # so we allow for the possibility that it's missing.
304 test 47, eval { truncate 'NoSuChFiLe', $TAINT0 } eq '', 'truncate';
305 test 48, $@ =~ /^(?:Insecure dependency|truncate not implemented)/, $@;
307 test 49, eval { rename '', $TAINT } eq '', 'rename';
308 test 50, $@ =~ /^Insecure dependency/, $@;
310 test 51, eval { unlink $TAINT } eq '', 'unlink';
311 test 52, $@ =~ /^Insecure dependency/, $@;
313 test 53, eval { utime $TAINT } eq '', 'utime';
314 test 54, $@ =~ /^Insecure dependency/, $@;
316 if ($Config{d_chown}) {
317 test 55, eval { chown -1, -1, $TAINT } eq '', 'chown';
318 test 56, $@ =~ /^Insecure dependency/, $@;
321 for (55..56) { print "ok $_ # Skipped: chown() is not available\n" }
324 if ($Config{d_link}) {
325 test 57, eval { link $TAINT, '' } eq '', 'link';
326 test 58, $@ =~ /^Insecure dependency/, $@;
329 for (57..58) { print "ok $_ # Skipped: link() is not available\n" }
332 if ($Config{d_symlink}) {
333 test 59, eval { symlink $TAINT, '' } eq '', 'symlink';
334 test 60, $@ =~ /^Insecure dependency/, $@;
337 for (59..60) { print "ok $_ # Skipped: symlink() is not available\n" }
341 # Operations which affect directories can't use tainted data.
343 test 61, eval { mkdir $TAINT0, $TAINT } eq '', 'mkdir';
344 test 62, $@ =~ /^Insecure dependency/, $@;
346 test 63, eval { rmdir $TAINT } eq '', 'rmdir';
347 test 64, $@ =~ /^Insecure dependency/, $@;
349 test 65, eval { chdir $TAINT } eq '', 'chdir';
350 test 66, $@ =~ /^Insecure dependency/, $@;
352 if ($Config{d_chroot}) {
353 test 67, eval { chroot $TAINT } eq '', 'chroot';
354 test 68, $@ =~ /^Insecure dependency/, $@;
357 for (67..68) { print "ok $_ # Skipped: chroot() is not available\n" }
361 # Some operations using files can't use tainted data.
363 my $foo = "imaginary library" . $TAINT;
364 test 69, eval { require $foo } eq '', 'require';
365 test 70, $@ =~ /^Insecure dependency/, $@;
367 my $filename = "./taintB$$"; # NB: $filename isn't tainted!
368 END { unlink $filename if defined $filename }
369 $foo = $filename . $TAINT;
370 unlink $filename; # in any case
372 test 71, eval { open FOO, $foo } eq '', 'open for read';
373 test 72, $@ eq '', $@; # NB: This should be allowed
375 # Try first new style but allow also old style.
376 test 73, $!{ENOENT} ||
377 $! == 2 || # File not found
378 ($Is_Dos && $! == 22) ||
379 ($^O eq 'mint' && $! == 33);
381 test 74, eval { open FOO, "> $foo" } eq '', 'open for write';
382 test 75, $@ =~ /^Insecure dependency/, $@;
385 # Commands to the system can't use tainted data
389 if ($^O eq 'amigaos') {
390 for (76..79) { print "ok $_ # Skipped: open('|') is not available\n" }
393 test 76, eval { open FOO, "| x$foo" } eq '', 'popen to';
394 test 77, $@ =~ /^Insecure dependency/, $@;
396 test 78, eval { open FOO, "x$foo |" } eq '', 'popen from';
397 test 79, $@ =~ /^Insecure dependency/, $@;
400 test 80, eval { exec $TAINT } eq '', 'exec';
401 test 81, $@ =~ /^Insecure dependency/, $@;
403 test 82, eval { system $TAINT } eq '', 'system';
404 test 83, $@ =~ /^Insecure dependency/, $@;
409 test 84, eval { `$echo 1$foo` } eq '', 'backticks';
410 test 85, $@ =~ /^Insecure dependency/, $@;
412 if ($Is_VMS) { # wildcard expansion doesn't invoke shell, so is safe
413 test 86, join('', eval { glob $foo } ) ne '', 'globbing';
414 test 87, $@ eq '', $@;
417 for (86..87) { print "ok $_ # Skipped: this is not VMS\n"; }
421 # Operations which affect processes can't use tainted data.
423 test 88, eval { kill 0, $TAINT } eq '', 'kill';
424 test 89, $@ =~ /^Insecure dependency/, $@;
426 if ($Config{d_setpgrp}) {
427 test 90, eval { setpgrp 0, $TAINT } eq '', 'setpgrp';
428 test 91, $@ =~ /^Insecure dependency/, $@;
431 for (90..91) { print "ok $_ # Skipped: setpgrp() is not available\n" }
434 if ($Config{d_setprior}) {
435 test 92, eval { setpriority 0, $TAINT, $TAINT } eq '', 'setpriority';
436 test 93, $@ =~ /^Insecure dependency/, $@;
439 for (92..93) { print "ok $_ # Skipped: setpriority() is not available\n" }
443 # Some miscellaneous operations can't use tainted data.
445 if ($Config{d_syscall}) {
446 test 94, eval { syscall $TAINT } eq '', 'syscall';
447 test 95, $@ =~ /^Insecure dependency/, $@;
450 for (94..95) { print "ok $_ # Skipped: syscall() is not available\n" }
457 my $temp = "./taintC$$";
459 test 96, open(FOO, "> $temp"), "Couldn't open $temp for write: $!";
461 test 97, eval { ioctl FOO, $TAINT, $foo } eq '', 'ioctl';
462 test 98, $@ =~ /^Insecure dependency/, $@;
464 if ($Config{d_fcntl}) {
465 test 99, eval { fcntl FOO, $TAINT, $foo } eq '', 'fcntl';
466 test 100, $@ =~ /^Insecure dependency/, $@;
469 for (99..100) { print "ok $_ # Skipped: fcntl() is not available\n" }
476 # Some tests involving references
478 my $foo = 'abc' . $TAINT;
480 test 101, not tainted $fooref;
481 test 102, tainted $$fooref;
482 test 103, tainted $foo;
485 # Some tests involving assignment
489 test 104, all_tainted $foo, $bar;
490 test 105, tainted($foo = $bar);
491 test 106, tainted($bar = $bar);
492 test 107, tainted($bar += $bar);
493 test 108, tainted($bar -= $bar);
494 test 109, tainted($bar *= $bar);
495 test 110, tainted($bar++);
496 test 111, tainted($bar /= $bar);
497 test 112, tainted($bar += 0);
498 test 113, tainted($bar -= 2);
499 test 114, tainted($bar *= -1);
500 test 115, tainted($bar /= 1);
501 test 116, tainted($bar--);
505 # Test assignment and return of lists
507 my @foo = ("A", "tainted" . $TAINT, "B");
508 test 118, not tainted $foo[0];
509 test 119, tainted $foo[1];
510 test 120, not tainted $foo[2];
512 test 121, not tainted $bar[0];
513 test 122, tainted $bar[1];
514 test 123, not tainted $bar[2];
515 my @baz = eval { "A", "tainted" . $TAINT, "B" };
516 test 124, not tainted $baz[0];
517 test 125, tainted $baz[1];
518 test 126, not tainted $baz[2];
519 my @plugh = eval q[ "A", "tainted" . $TAINT, "B" ];
520 test 127, not tainted $plugh[0];
521 test 128, tainted $plugh[1];
522 test 129, not tainted $plugh[2];
523 my $nautilus = sub { "A", "tainted" . $TAINT, "B" };
524 test 130, not tainted ((&$nautilus)[0]);
525 test 131, tainted ((&$nautilus)[1]);
526 test 132, not tainted ((&$nautilus)[2]);
527 my @xyzzy = &$nautilus;
528 test 133, not tainted $xyzzy[0];
529 test 134, tainted $xyzzy[1];
530 test 135, not tainted $xyzzy[2];
531 my $red_october = sub { return "A", "tainted" . $TAINT, "B" };
532 test 136, not tainted ((&$red_october)[0]);
533 test 137, tainted ((&$red_october)[1]);
534 test 138, not tainted ((&$red_october)[2]);
535 my @corge = &$red_october;
536 test 139, not tainted $corge[0];
537 test 140, tainted $corge[1];
538 test 141, not tainted $corge[2];
541 # Test for system/library calls returning string data of dubious origin.
543 # No reliable %Config check for getpw*
544 if (eval { setpwent(); getpwent(); 1 }) {
546 my @getpwent = getpwent();
547 die "getpwent: $!\n" unless (@getpwent);
548 test 142,( not tainted $getpwent[0]
549 and not tainted $getpwent[1]
550 and not tainted $getpwent[2]
551 and not tainted $getpwent[3]
552 and not tainted $getpwent[4]
553 and not tainted $getpwent[5]
554 and tainted $getpwent[6] # gecos
555 and not tainted $getpwent[7]
556 and not tainted $getpwent[8]);
559 for (142) { print "ok $_ # Skipped: getpwent() is not available\n" }
562 if ($Config{d_readdir}) { # pretty hard to imagine not
564 opendir(D, "op") or die "opendir: $!\n";
565 my $readdir = readdir(D);
566 test 143, tainted $readdir;
569 for (143) { print "ok $_ # Skipped: readdir() is not available\n" }
572 if ($Config{d_readlink} && $Config{d_symlink}) {
573 my $symlink = "sl$$";
575 symlink("/something/naughty", $symlink) or die "symlink: $!\n";
576 my $readlink = readlink($symlink);
577 test 144, tainted $readlink;
580 for (144) { print "ok $_ # Skipped: readlink() or symlink() is not available\n"; }
584 # test bitwise ops (regression bug)
588 test 145, not tainted $j;
591 test 146, tainted $j;
594 # test target of substitution (regression bug)
596 my $why = $TAINT."y";
598 test 147, tainted $why;
602 test 148, tainted $why;
604 $why =~ s/e/'-'.$$/ge;
605 test 149, tainted $why;