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 @INC = '../lib' if -d '../lib';
18 my $Is_VMS = $^O eq 'VMS';
19 my $Is_MSWin32 = $^O eq 'MSWin32';
20 my $Is_Dos = $^O eq 'dos';
21 my $Invoke_Perl = $Is_VMS ? 'MCR Sys$Disk:[]Perl.' :
22 $Is_MSWin32 ? '.\perl' : './perl';
23 my @MoreEnv = qw/IFS CDPATH ENV BASH_ENV/;
27 for $x ('DCL$PATH', @MoreEnv) {
28 ($old{$x}) = $ENV{$x} =~ /^(.*)$/ if exists $ENV{$x};
33 warn "# Note: logical name 'PATH' may have been deleted\n";
34 @ENV{keys %old} = values %old;
40 # The empty tainted value, for tainting strings
41 my $TAINT = substr($^X, 0, 0);
42 # A tainted zero, useful for tainting numbers
43 my $TAINT0 = 0 + $TAINT;
45 # This taints each argument passed. All must be lvalues.
46 # Side effect: It also stringifies them. :-(
48 for (@_) { $_ .= $TAINT }
51 # How to identify taint when you see it
53 not eval { join("",@_), kill 0; 1 };
59 for (@_) { return 0 unless tainted $_ }
64 my($serial, $boolean, $diag) = @_;
68 print "not ok $serial\n";
69 for (split m/^/m, $diag) {
74 or substr($diag, -1) eq "\n";
78 # We need an external program to call.
79 my $ECHO = ($Is_MSWin32 ? ".\\echo$$" : "./echo$$");
81 open PROG, "> $ECHO" or die "Can't create $ECHO: $!";
82 print PROG 'print "@ARGV\n"', "\n";
84 my $echo = "$Invoke_Perl $ECHO";
88 # First, let's make sure that Perl is checking the dangerous
89 # environment variables. Maybe they aren't set yet, so we'll
90 # taint them ourselves.
92 $ENV{'DCL$PATH'} = '' if $Is_VMS;
95 delete @ENV{@MoreEnv};
98 test 1, eval { `$echo 1` } eq "1\n";
100 if ($Is_MSWin32 || $Is_VMS || $Is_Dos) {
101 print "# Environment tainting tests skipped\n";
102 for (2..5) { print "ok $_\n" }
105 my @vars = ('PATH', @MoreEnv);
106 while (my $v = $vars[0]) {
107 local $ENV{$v} = $TAINT;
108 last if eval { `$echo 1` };
109 last unless $@ =~ /^Insecure \$ENV{$v}/;
112 test 2, !@vars, "\$$vars[0]";
114 # tainted $TERM is unsafe only if it contains metachars
116 $ENV{TERM} = 'e=mc2';
117 test 3, eval { `$echo 1` } eq "1\n";
118 $ENV{TERM} = 'e=mc2' . $TAINT;
119 test 4, eval { `$echo 1` } eq '';
120 test 5, $@ =~ /^Insecure \$ENV{TERM}/, $@;
124 if ($^O eq 'os2' || $^O eq 'amigaos' || $Is_MSWin32 || $Is_Dos) {
125 print "# all directories are writeable\n";
128 $tmp = (grep { defined and -d and (stat _)[2] & 2 }
129 qw(/tmp /var/tmp /usr/tmp /sys$scratch),
130 @ENV{qw(TMP TEMP)})[0]
131 or print "# can't find world-writeable directory to test PATH\n";
135 local $ENV{PATH} = $tmp;
136 test 6, eval { `$echo 1` } eq '';
137 test 7, $@ =~ /^Insecure directory in \$ENV{PATH}/, $@;
140 for (6..7) { print "ok $_ # Skipped: all directories are writeable\n" }
144 $ENV{'DCL$PATH'} = $TAINT;
145 test 8, eval { `$echo 1` } eq '';
146 test 9, $@ =~ /^Insecure \$ENV{DCL\$PATH}/, $@;
148 $ENV{'DCL$PATH'} = $tmp;
149 test 10, eval { `$echo 1` } eq '';
150 test 11, $@ =~ /^Insecure directory in \$ENV{DCL\$PATH}/, $@;
153 for (10..11) { print "ok $_ # Skipped: can't find world-writeable directory to test DCL\$PATH\n" }
155 $ENV{'DCL$PATH'} = '';
158 for (8..11) { print "ok $_ # Skipped: This is not VMS\n"; }
162 # Let's see that we can taint and untaint as needed.
165 test 12, tainted $foo;
167 # That was a sanity check. If it failed, stop the insanity!
168 die "Taint checks don't seem to be enabled" unless tainted $foo;
171 test 13, not tainted $foo;
174 test 14, tainted $foo;
177 test 15, not any_tainted @list;
178 taint_these @list[1,3,5,7,9];
179 test 16, any_tainted @list;
180 test 17, all_tainted @list[1,3,5,7,9];
181 test 18, not any_tainted @list[0,2,4,6,8];
183 ($foo) = $foo =~ /(.+)/;
184 test 19, not tainted $foo;
186 $foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
187 test 20, not tainted $foo;
188 test 21, $foo eq 'bar';
193 ($foo) = ('bar' . $TAINT) =~ /(.+)/;
194 test 22, tainted $foo;
195 test 23, $foo eq 'bar';
197 $foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
198 test 24, tainted $foo;
199 test 25, $foo eq 'bar';
202 $foo = $1 if 'bar' =~ /(.+)$TAINT/;
203 test 26, tainted $foo;
204 test 27, $foo eq 'bar';
206 my $pi = 4 * atan2(1,1) + $TAINT0;
207 test 28, tainted $pi;
209 ($pi) = $pi =~ /(\d+\.\d+)/;
210 test 29, not tainted $pi;
211 test 30, sprintf("%.5f", $pi) eq '3.14159';
214 # How about command-line arguments? The problem is that we don't
215 # always get some, so we'll run another process with some.
218 open PROG, "> $arg" or die "Can't create $arg: $!";
220 eval { join('', @ARGV), kill 0 };
221 exit 0 if $@ =~ /^Insecure dependency/;
222 print "# Oops: \$@ was [$@]\n";
226 print `$Invoke_Perl "-T" $arg and some suspect arguments`;
227 test 31, !$?, "Exited with status $?";
231 # Reading from a file should be tainted
234 test 32, open(FILE, $file), "Couldn't open '$file': $!";
237 sysread(FILE, $block, 100);
240 test 33, tainted $block;
241 test 34, tainted $line;
244 # Globs should be forbidden, except under VMS,
245 # which doesn't spawn an external program.
247 for (35..36) { print "ok $_\n"; }
250 my @globs = eval { <*> };
251 test 35, @globs == 0 && $@ =~ /^Insecure dependency/;
253 @globs = eval { glob '*' };
254 test 36, @globs == 0 && $@ =~ /^Insecure dependency/;
257 # Output of commands should be tainted
259 my $foo = `$echo abc`;
260 test 37, tainted $foo;
263 # Certain system variables should be tainted
265 test 38, all_tainted $^X, $0;
268 # Results of matching should all be untainted
270 my $foo = "abcdefghi" . $TAINT;
271 test 39, tainted $foo;
274 test 40, not any_tainted $`, $&, $';
276 $foo =~ /(...)(...)(...)/;
277 test 41, not any_tainted $1, $2, $3, $+;
279 my @bar = $foo =~ /(...)(...)(...)/;
280 test 42, not any_tainted @bar;
282 test 43, tainted $foo; # $foo should still be tainted!
283 test 44, $foo eq "abcdefghi";
286 # Operations which affect files can't use tainted data.
288 test 45, eval { chmod 0, $TAINT } eq '', 'chmod';
289 test 46, $@ =~ /^Insecure dependency/, $@;
291 # There is no feature test in $Config{} for truncate,
292 # so we allow for the possibility that it's missing.
293 test 47, eval { truncate 'NoSuChFiLe', $TAINT0 } eq '', 'truncate';
294 test 48, $@ =~ /^(?:Insecure dependency|truncate not implemented)/, $@;
296 test 49, eval { rename '', $TAINT } eq '', 'rename';
297 test 50, $@ =~ /^Insecure dependency/, $@;
299 test 51, eval { unlink $TAINT } eq '', 'unlink';
300 test 52, $@ =~ /^Insecure dependency/, $@;
302 test 53, eval { utime $TAINT } eq '', 'utime';
303 test 54, $@ =~ /^Insecure dependency/, $@;
305 if ($Config{d_chown}) {
306 test 55, eval { chown -1, -1, $TAINT } eq '', 'chown';
307 test 56, $@ =~ /^Insecure dependency/, $@;
310 for (55..56) { print "ok $_ # Skipped: chown() is not available\n" }
313 if ($Config{d_link}) {
314 test 57, eval { link $TAINT, '' } eq '', 'link';
315 test 58, $@ =~ /^Insecure dependency/, $@;
318 for (57..58) { print "ok $_ # Skipped: link() is not available\n" }
321 if ($Config{d_symlink}) {
322 test 59, eval { symlink $TAINT, '' } eq '', 'symlink';
323 test 60, $@ =~ /^Insecure dependency/, $@;
326 for (59..60) { print "ok $_ # Skipped: symlink() is not available\n" }
330 # Operations which affect directories can't use tainted data.
332 test 61, eval { mkdir $TAINT0, $TAINT } eq '', 'mkdir';
333 test 62, $@ =~ /^Insecure dependency/, $@;
335 test 63, eval { rmdir $TAINT } eq '', 'rmdir';
336 test 64, $@ =~ /^Insecure dependency/, $@;
338 test 65, eval { chdir $TAINT } eq '', 'chdir';
339 test 66, $@ =~ /^Insecure dependency/, $@;
341 if ($Config{d_chroot}) {
342 test 67, eval { chroot $TAINT } eq '', 'chroot';
343 test 68, $@ =~ /^Insecure dependency/, $@;
346 for (67..68) { print "ok $_ # Skipped: chroot() is not available\n" }
350 # Some operations using files can't use tainted data.
352 my $foo = "imaginary library" . $TAINT;
353 test 69, eval { require $foo } eq '', 'require';
354 test 70, $@ =~ /^Insecure dependency/, $@;
356 my $filename = "./taintB$$"; # NB: $filename isn't tainted!
357 END { unlink $filename if defined $filename }
358 $foo = $filename . $TAINT;
359 unlink $filename; # in any case
361 test 71, eval { open FOO, $foo } eq '', 'open for read';
362 test 72, $@ eq '', $@; # NB: This should be allowed
363 test 73, $! == 2 || ($Is_Dos && $! == 22); # File not found
365 test 74, eval { open FOO, "> $foo" } eq '', 'open for write';
366 test 75, $@ =~ /^Insecure dependency/, $@;
369 # Commands to the system can't use tainted data
373 if ($^O eq 'amigaos') {
374 for (76..79) { print "ok $_ # Skipped: open('|') is not available\n" }
377 test 76, eval { open FOO, "| $foo" } eq '', 'popen to';
378 test 77, $@ =~ /^Insecure dependency/, $@;
380 test 78, eval { open FOO, "$foo |" } eq '', 'popen from';
381 test 79, $@ =~ /^Insecure dependency/, $@;
384 test 80, eval { exec $TAINT } eq '', 'exec';
385 test 81, $@ =~ /^Insecure dependency/, $@;
387 test 82, eval { system $TAINT } eq '', 'system';
388 test 83, $@ =~ /^Insecure dependency/, $@;
393 test 84, eval { `$echo 1$foo` } eq '', 'backticks';
394 test 85, $@ =~ /^Insecure dependency/, $@;
396 if ($Is_VMS) { # wildcard expansion doesn't invoke shell, so is safe
397 test 86, join('', eval { glob $foo } ) ne '', 'globbing';
398 test 87, $@ eq '', $@;
401 for (86..87) { print "ok $_ # Skipped: this is not VMS\n"; }
405 # Operations which affect processes can't use tainted data.
407 test 88, eval { kill 0, $TAINT } eq '', 'kill';
408 test 89, $@ =~ /^Insecure dependency/, $@;
410 if ($Config{d_setpgrp}) {
411 test 90, eval { setpgrp 0, $TAINT } eq '', 'setpgrp';
412 test 91, $@ =~ /^Insecure dependency/, $@;
415 for (90..91) { print "ok $_ # Skipped: setpgrp() is not available\n" }
418 if ($Config{d_setprior}) {
419 test 92, eval { setpriority 0, $TAINT, $TAINT } eq '', 'setpriority';
420 test 93, $@ =~ /^Insecure dependency/, $@;
423 for (92..93) { print "ok $_ # Skipped: setpriority() is not available\n" }
427 # Some miscellaneous operations can't use tainted data.
429 if ($Config{d_syscall}) {
430 test 94, eval { syscall $TAINT } eq '', 'syscall';
431 test 95, $@ =~ /^Insecure dependency/, $@;
434 for (94..95) { print "ok $_ # Skipped: syscall() is not available\n" }
441 my $temp = "./taintC$$";
443 test 96, open(FOO, "> $temp"), "Couldn't open $temp for write: $!";
445 test 97, eval { ioctl FOO, $TAINT, $foo } eq '', 'ioctl';
446 test 98, $@ =~ /^Insecure dependency/, $@;
448 if ($Config{d_fcntl}) {
449 test 99, eval { fcntl FOO, $TAINT, $foo } eq '', 'fcntl';
450 test 100, $@ =~ /^Insecure dependency/, $@;
453 for (99..100) { print "ok $_ # Skipped: fcntl() is not available\n" }
460 # Some tests involving references
462 my $foo = 'abc' . $TAINT;
464 test 101, not tainted $fooref;
465 test 102, tainted $$fooref;
466 test 103, tainted $foo;
469 # Some tests involving assignment
473 test 104, all_tainted $foo, $bar;
474 test 105, tainted($foo = $bar);
475 test 106, tainted($bar = $bar);
476 test 107, tainted($bar += $bar);
477 test 108, tainted($bar -= $bar);
478 test 109, tainted($bar *= $bar);
479 test 110, tainted($bar++);
480 test 111, tainted($bar /= $bar);
481 test 112, tainted($bar += 0);
482 test 113, tainted($bar -= 2);
483 test 114, tainted($bar *= -1);
484 test 115, tainted($bar /= 1);
485 test 116, tainted($bar--);
489 # Test assignment and return of lists
491 my @foo = ("A", "tainted" . $TAINT, "B");
492 test 118, not tainted $foo[0];
493 test 119, tainted $foo[1];
494 test 120, not tainted $foo[2];
496 test 121, not tainted $bar[0];
497 test 122, tainted $bar[1];
498 test 123, not tainted $bar[2];
499 my @baz = eval { "A", "tainted" . $TAINT, "B" };
500 test 124, not tainted $baz[0];
501 test 125, tainted $baz[1];
502 test 126, not tainted $baz[2];
503 my @plugh = eval q[ "A", "tainted" . $TAINT, "B" ];
504 test 127, not tainted $plugh[0];
505 test 128, tainted $plugh[1];
506 test 129, not tainted $plugh[2];
507 my $nautilus = sub { "A", "tainted" . $TAINT, "B" };
508 test 130, not tainted ((&$nautilus)[0]);
509 test 131, tainted ((&$nautilus)[1]);
510 test 132, not tainted ((&$nautilus)[2]);
511 my @xyzzy = &$nautilus;
512 test 133, not tainted $xyzzy[0];
513 test 134, tainted $xyzzy[1];
514 test 135, not tainted $xyzzy[2];
515 my $red_october = sub { return "A", "tainted" . $TAINT, "B" };
516 test 136, not tainted ((&$red_october)[0]);
517 test 137, tainted ((&$red_october)[1]);
518 test 138, not tainted ((&$red_october)[2]);
519 my @corge = &$red_october;
520 test 139, not tainted $corge[0];
521 test 140, tainted $corge[1];
522 test 141, not tainted $corge[2];
525 # Test for system/library calls returning string data of dubious origin.
527 # No reliable %Config check for getpw*
528 if (eval { setpwent(); getpwent(); 1 }) {
530 my @getpwent = getpwent();
531 die "getpwent: $!\n" unless (@getpwent);
532 test 142,( not tainted $getpwent[0]
533 and not tainted $getpwent[1]
534 and not tainted $getpwent[2]
535 and not tainted $getpwent[3]
536 and not tainted $getpwent[4]
537 and not tainted $getpwent[5]
538 and tainted $getpwent[6] # gecos
539 and not tainted $getpwent[7]
540 and not tainted $getpwent[8]);
543 for (142) { print "ok $_ # Skipped: getpwent() is not available\n" }
546 if ($Config{d_readdir}) { # pretty hard to imagine not
548 opendir(D, "op") or die "opendir: $!\n";
549 my $readdir = readdir(D);
550 test 143, tainted $readdir;
553 for (143) { print "ok $_ # Skipped: readdir() is not available\n" }
556 if ($Config{d_readlink} && $Config{d_symlink}) {
557 my $symlink = "sl$$";
559 symlink("/something/naughty", $symlink) or die "symlink: $!\n";
560 my $readlink = readlink($symlink);
561 test 144, tainted $readlink;
564 for (144) { print "ok $_ # Skipped: readlink() or symlink() is not available\n"; }
568 # test bitwise ops (regression bug)
572 test 145, not tainted $j;
575 test 146, tainted $j;
578 # test target of substitution (regression bug)
580 my $why = $TAINT."y";
582 test 147, tainted $why;
586 test 148, tainted $why;
588 $why =~ s/e/'-'.$$/ge;
589 test 149, tainted $why;