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.
257 if (1 # built-in glob
259 for (35..36) { print "ok $_\n"; }
262 my @globs = eval { <*> };
263 test 35, @globs == 0 && $@ =~ /^Insecure dependency/;
265 @globs = eval { glob '*' };
266 test 36, @globs == 0 && $@ =~ /^Insecure dependency/;
269 # Output of commands should be tainted
271 my $foo = `$echo abc`;
272 test 37, tainted $foo;
275 # Certain system variables should be tainted
277 test 38, all_tainted $^X, $0;
280 # Results of matching should all be untainted
282 my $foo = "abcdefghi" . $TAINT;
283 test 39, tainted $foo;
286 test 40, not any_tainted $`, $&, $';
288 $foo =~ /(...)(...)(...)/;
289 test 41, not any_tainted $1, $2, $3, $+;
291 my @bar = $foo =~ /(...)(...)(...)/;
292 test 42, not any_tainted @bar;
294 test 43, tainted $foo; # $foo should still be tainted!
295 test 44, $foo eq "abcdefghi";
298 # Operations which affect files can't use tainted data.
300 test 45, eval { chmod 0, $TAINT } eq '', 'chmod';
301 test 46, $@ =~ /^Insecure dependency/, $@;
303 # There is no feature test in $Config{} for truncate,
304 # so we allow for the possibility that it's missing.
305 test 47, eval { truncate 'NoSuChFiLe', $TAINT0 } eq '', 'truncate';
306 test 48, $@ =~ /^(?:Insecure dependency|truncate not implemented)/, $@;
308 test 49, eval { rename '', $TAINT } eq '', 'rename';
309 test 50, $@ =~ /^Insecure dependency/, $@;
311 test 51, eval { unlink $TAINT } eq '', 'unlink';
312 test 52, $@ =~ /^Insecure dependency/, $@;
314 test 53, eval { utime $TAINT } eq '', 'utime';
315 test 54, $@ =~ /^Insecure dependency/, $@;
317 if ($Config{d_chown}) {
318 test 55, eval { chown -1, -1, $TAINT } eq '', 'chown';
319 test 56, $@ =~ /^Insecure dependency/, $@;
322 for (55..56) { print "ok $_ # Skipped: chown() is not available\n" }
325 if ($Config{d_link}) {
326 test 57, eval { link $TAINT, '' } eq '', 'link';
327 test 58, $@ =~ /^Insecure dependency/, $@;
330 for (57..58) { print "ok $_ # Skipped: link() is not available\n" }
333 if ($Config{d_symlink}) {
334 test 59, eval { symlink $TAINT, '' } eq '', 'symlink';
335 test 60, $@ =~ /^Insecure dependency/, $@;
338 for (59..60) { print "ok $_ # Skipped: symlink() is not available\n" }
342 # Operations which affect directories can't use tainted data.
344 test 61, eval { mkdir $TAINT0, $TAINT } eq '', 'mkdir';
345 test 62, $@ =~ /^Insecure dependency/, $@;
347 test 63, eval { rmdir $TAINT } eq '', 'rmdir';
348 test 64, $@ =~ /^Insecure dependency/, $@;
350 test 65, eval { chdir $TAINT } eq '', 'chdir';
351 test 66, $@ =~ /^Insecure dependency/, $@;
353 if ($Config{d_chroot}) {
354 test 67, eval { chroot $TAINT } eq '', 'chroot';
355 test 68, $@ =~ /^Insecure dependency/, $@;
358 for (67..68) { print "ok $_ # Skipped: chroot() is not available\n" }
362 # Some operations using files can't use tainted data.
364 my $foo = "imaginary library" . $TAINT;
365 test 69, eval { require $foo } eq '', 'require';
366 test 70, $@ =~ /^Insecure dependency/, $@;
368 my $filename = "./taintB$$"; # NB: $filename isn't tainted!
369 END { unlink $filename if defined $filename }
370 $foo = $filename . $TAINT;
371 unlink $filename; # in any case
373 test 71, eval { open FOO, $foo } eq '', 'open for read';
374 test 72, $@ eq '', $@; # NB: This should be allowed
376 # Try first new style but allow also old style.
377 test 73, $!{ENOENT} ||
378 $! == 2 || # File not found
379 ($Is_Dos && $! == 22) ||
380 ($^O eq 'mint' && $! == 33);
382 test 74, eval { open FOO, "> $foo" } eq '', 'open for write';
383 test 75, $@ =~ /^Insecure dependency/, $@;
386 # Commands to the system can't use tainted data
390 if ($^O eq 'amigaos') {
391 for (76..79) { print "ok $_ # Skipped: open('|') is not available\n" }
394 test 76, eval { open FOO, "| x$foo" } eq '', 'popen to';
395 test 77, $@ =~ /^Insecure dependency/, $@;
397 test 78, eval { open FOO, "x$foo |" } eq '', 'popen from';
398 test 79, $@ =~ /^Insecure dependency/, $@;
401 test 80, eval { exec $TAINT } eq '', 'exec';
402 test 81, $@ =~ /^Insecure dependency/, $@;
404 test 82, eval { system $TAINT } eq '', 'system';
405 test 83, $@ =~ /^Insecure dependency/, $@;
410 test 84, eval { `$echo 1$foo` } eq '', 'backticks';
411 test 85, $@ =~ /^Insecure dependency/, $@;
413 if ($Is_VMS) { # wildcard expansion doesn't invoke shell, so is safe
414 test 86, join('', eval { glob $foo } ) ne '', 'globbing';
415 test 87, $@ eq '', $@;
418 for (86..87) { print "ok $_ # Skipped: this is not VMS\n"; }
422 # Operations which affect processes can't use tainted data.
424 test 88, eval { kill 0, $TAINT } eq '', 'kill';
425 test 89, $@ =~ /^Insecure dependency/, $@;
427 if ($Config{d_setpgrp}) {
428 test 90, eval { setpgrp 0, $TAINT } eq '', 'setpgrp';
429 test 91, $@ =~ /^Insecure dependency/, $@;
432 for (90..91) { print "ok $_ # Skipped: setpgrp() is not available\n" }
435 if ($Config{d_setprior}) {
436 test 92, eval { setpriority 0, $TAINT, $TAINT } eq '', 'setpriority';
437 test 93, $@ =~ /^Insecure dependency/, $@;
440 for (92..93) { print "ok $_ # Skipped: setpriority() is not available\n" }
444 # Some miscellaneous operations can't use tainted data.
446 if ($Config{d_syscall}) {
447 test 94, eval { syscall $TAINT } eq '', 'syscall';
448 test 95, $@ =~ /^Insecure dependency/, $@;
451 for (94..95) { print "ok $_ # Skipped: syscall() is not available\n" }
458 my $temp = "./taintC$$";
460 test 96, open(FOO, "> $temp"), "Couldn't open $temp for write: $!";
462 test 97, eval { ioctl FOO, $TAINT, $foo } eq '', 'ioctl';
463 test 98, $@ =~ /^Insecure dependency/, $@;
465 if ($Config{d_fcntl}) {
466 test 99, eval { fcntl FOO, $TAINT, $foo } eq '', 'fcntl';
467 test 100, $@ =~ /^Insecure dependency/, $@;
470 for (99..100) { print "ok $_ # Skipped: fcntl() is not available\n" }
477 # Some tests involving references
479 my $foo = 'abc' . $TAINT;
481 test 101, not tainted $fooref;
482 test 102, tainted $$fooref;
483 test 103, tainted $foo;
486 # Some tests involving assignment
490 test 104, all_tainted $foo, $bar;
491 test 105, tainted($foo = $bar);
492 test 106, tainted($bar = $bar);
493 test 107, tainted($bar += $bar);
494 test 108, tainted($bar -= $bar);
495 test 109, tainted($bar *= $bar);
496 test 110, tainted($bar++);
497 test 111, tainted($bar /= $bar);
498 test 112, tainted($bar += 0);
499 test 113, tainted($bar -= 2);
500 test 114, tainted($bar *= -1);
501 test 115, tainted($bar /= 1);
502 test 116, tainted($bar--);
506 # Test assignment and return of lists
508 my @foo = ("A", "tainted" . $TAINT, "B");
509 test 118, not tainted $foo[0];
510 test 119, tainted $foo[1];
511 test 120, not tainted $foo[2];
513 test 121, not tainted $bar[0];
514 test 122, tainted $bar[1];
515 test 123, not tainted $bar[2];
516 my @baz = eval { "A", "tainted" . $TAINT, "B" };
517 test 124, not tainted $baz[0];
518 test 125, tainted $baz[1];
519 test 126, not tainted $baz[2];
520 my @plugh = eval q[ "A", "tainted" . $TAINT, "B" ];
521 test 127, not tainted $plugh[0];
522 test 128, tainted $plugh[1];
523 test 129, not tainted $plugh[2];
524 my $nautilus = sub { "A", "tainted" . $TAINT, "B" };
525 test 130, not tainted ((&$nautilus)[0]);
526 test 131, tainted ((&$nautilus)[1]);
527 test 132, not tainted ((&$nautilus)[2]);
528 my @xyzzy = &$nautilus;
529 test 133, not tainted $xyzzy[0];
530 test 134, tainted $xyzzy[1];
531 test 135, not tainted $xyzzy[2];
532 my $red_october = sub { return "A", "tainted" . $TAINT, "B" };
533 test 136, not tainted ((&$red_october)[0]);
534 test 137, tainted ((&$red_october)[1]);
535 test 138, not tainted ((&$red_october)[2]);
536 my @corge = &$red_october;
537 test 139, not tainted $corge[0];
538 test 140, tainted $corge[1];
539 test 141, not tainted $corge[2];
542 # Test for system/library calls returning string data of dubious origin.
544 # No reliable %Config check for getpw*
545 if (eval { setpwent(); getpwent(); 1 }) {
547 my @getpwent = getpwent();
548 die "getpwent: $!\n" unless (@getpwent);
549 test 142,( not tainted $getpwent[0]
550 and not tainted $getpwent[1]
551 and not tainted $getpwent[2]
552 and not tainted $getpwent[3]
553 and not tainted $getpwent[4]
554 and not tainted $getpwent[5]
555 and tainted $getpwent[6] # gecos
556 and not tainted $getpwent[7]
557 and not tainted $getpwent[8]);
560 for (142) { print "ok $_ # Skipped: getpwent() is not available\n" }
563 if ($Config{d_readdir}) { # pretty hard to imagine not
565 opendir(D, "op") or die "opendir: $!\n";
566 my $readdir = readdir(D);
567 test 143, tainted $readdir;
570 for (143) { print "ok $_ # Skipped: readdir() is not available\n" }
573 if ($Config{d_readlink} && $Config{d_symlink}) {
574 my $symlink = "sl$$";
576 symlink("/something/naughty", $symlink) or die "symlink: $!\n";
577 my $readlink = readlink($symlink);
578 test 144, tainted $readlink;
581 for (144) { print "ok $_ # Skipped: readlink() or symlink() is not available\n"; }
585 # test bitwise ops (regression bug)
589 test 145, not tainted $j;
592 test 146, tainted $j;
595 # test target of substitution (regression bug)
597 my $why = $TAINT."y";
599 test 147, tainted $why;
603 test 148, tainted $why;
605 $why =~ s/e/'-'.$$/ge;
606 test 149, tainted $why;