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 $Invoke_Perl = $Is_VMS ? 'MCR Sys$Disk:[]Perl.' :
21 $Is_MSWin32 ? '.\perl' : './perl';
23 my ($olddcl) = $ENV{'DCL$PATH'} =~ /^(.*)$/;
24 my ($oldifs) = $ENV{IFS} =~ /^(.*)$/;
28 warn "# Note: logical name 'PATH' may have been deleted\n";
29 \$ENV{IFS} = \$oldifs;
30 \$ENV{'DCL\$PATH'} = \$olddcl;
36 # The empty tainted value, for tainting strings
37 my $TAINT = substr($^X, 0, 0);
38 # A tainted zero, useful for tainting numbers
39 my $TAINT0 = 0 + $TAINT;
41 # This taints each argument passed. All must be lvalues.
42 # Side effect: It also stringifies them. :-(
44 for (@_) { $_ .= $TAINT }
47 # How to identify taint when you see it
49 not eval { join("",@_), kill 0; 1 };
55 for (@_) { return 0 unless tainted $_ }
60 my($serial, $boolean, $diag) = @_;
64 print "not ok $serial\n";
65 for (split m/^/m, $diag) {
70 or substr($diag, -1) eq "\n";
74 # We need an external program to call.
75 my $ECHO = "./echo$$";
77 open PROG, "> $ECHO" or die "Can't create $ECHO: $!";
78 print PROG 'print "@ARGV\n"', "\n";
80 my $echo = "$Invoke_Perl $ECHO";
84 # First, let's make sure that Perl is checking the dangerous
85 # environment variables. Maybe they aren't set yet, so we'll
86 # taint them ourselves.
88 $ENV{'DCL$PATH'} = '' if $Is_VMS;
92 test 1, eval { `$echo 1` } eq '';
93 test 2, $@ =~ /^Insecure \$ENV{PATH}/, $@;
97 test 3, eval { `$echo 1` } eq '';
98 test 4, $@ =~ /^Insecure \$ENV{IFS}/, $@;
101 if ($^O eq 'os2' || $^O eq 'amigaos') {
102 print "# all directories are writeable\n";
105 $tmp = (grep { defined and -d and (stat _)[2] & 2 }
106 qw(/tmp /var/tmp /usr/tmp /sys$scratch),
107 @ENV{qw(TMP TEMP)})[0]
108 or print "# can't find world-writeable directory to test PATH\n";
114 test 5, eval { `$echo 1` } eq '';
115 test 6, $@ =~ /^Insecure directory in \$ENV{PATH}/, $@;
118 for (5..6) { print "ok $_\n" }
123 test 7, eval { `$echo 1` } eq "1\n";
124 test 8, $@ eq '', $@;
127 $ENV{'DCL$PATH'} = $TAINT;
128 test 9, eval { `$echo 1` } eq '';
129 test 10, $@ =~ /^Insecure \$ENV{DCL\$PATH}/, $@;
131 $ENV{'DCL$PATH'} = $tmp;
132 test 11, eval { `$echo 1` } eq '';
133 test 12, $@ =~ /^Insecure directory in \$ENV{DCL\$PATH}/, $@;
136 print "# can't find world-writeable directory to test DCL\$PATH\n";
137 for (11..12) { print "ok $_\n" }
139 $ENV{'DCL$PATH'} = '';
142 print "# This is not VMS\n";
143 for (9..12) { print "ok $_\n"; }
147 # Let's see that we can taint and untaint as needed.
150 test 13, tainted $foo;
152 # That was a sanity check. If it failed, stop the insanity!
153 die "Taint checks don't seem to be enabled" unless tainted $foo;
156 test 14, not tainted $foo;
159 test 15, tainted $foo;
162 test 16, not any_tainted @list;
163 taint_these @list[1,3,5,7,9];
164 test 17, any_tainted @list;
165 test 18, all_tainted @list[1,3,5,7,9];
166 test 19, not any_tainted @list[0,2,4,6,8];
168 ($foo) = $foo =~ /(.+)/;
169 test 20, not tainted $foo;
171 $foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
172 test 21, not tainted $foo;
173 test 22, $foo eq 'bar';
175 my $pi = 4 * atan2(1,1) + $TAINT0;
176 test 23, tainted $pi;
178 ($pi) = $pi =~ /(\d+\.\d+)/;
179 test 24, not tainted $pi;
180 test 25, sprintf("%.5f", $pi) eq '3.14159';
183 # How about command-line arguments? The problem is that we don't
184 # always get some, so we'll run another process with some.
187 open PROG, "> $arg" or die "Can't create $arg: $!";
189 eval { join('', @ARGV), kill 0 };
190 exit 0 if $@ =~ /^Insecure dependency/;
191 print "# Oops: \$@ was [$@]\n";
195 print `$Invoke_Perl "-T" $arg and some suspect arguments`;
196 test 26, !$?, "Exited with status $?";
200 # Reading from a file should be tainted
203 test 27, open(FILE, $file), "Couldn't open '$file': $!";
206 sysread(FILE, $block, 100);
209 test 28, tainted $block;
210 test 29, tainted $line;
213 # Globs should be tainted.
215 # Some glob implementations need to spawn system programs.
216 local $ENV{PATH} = '';
217 $ENV{PATH} = (-l '/bin' ? '' : '/bin:') . '/usr/bin' unless $Is_VMS;
220 test 30, all_tainted @globs;
223 test 31, all_tainted @globs;
226 # Output of commands should be tainted
228 my $foo = `$echo abc`;
229 test 32, tainted $foo;
232 # Certain system variables should be tainted
234 test 33, all_tainted $^X, $0;
237 # Results of matching should all be untainted
239 my $foo = "abcdefghi" . $TAINT;
240 test 34, tainted $foo;
243 test 35, not any_tainted $`, $&, $';
245 $foo =~ /(...)(...)(...)/;
246 test 36, not any_tainted $1, $2, $3, $+;
248 my @bar = $foo =~ /(...)(...)(...)/;
249 test 37, not any_tainted @bar;
251 test 38, tainted $foo; # $foo should still be tainted!
252 test 39, $foo eq "abcdefghi";
255 # Operations which affect files can't use tainted data.
257 test 40, eval { chmod 0, $TAINT } eq '', 'chmod';
258 test 41, $@ =~ /^Insecure dependency/, $@;
260 # There is no feature test in $Config{} for truncate,
261 # so we allow for the possibility that it's missing.
262 test 42, eval { truncate 'NoSuChFiLe', $TAINT0 } eq '', 'truncate';
263 test 43, $@ =~ /^(?:Insecure dependency|truncate not implemented)/, $@;
265 test 44, eval { rename '', $TAINT } eq '', 'rename';
266 test 45, $@ =~ /^Insecure dependency/, $@;
268 test 46, eval { unlink $TAINT } eq '', 'unlink';
269 test 47, $@ =~ /^Insecure dependency/, $@;
271 test 48, eval { utime $TAINT } eq '', 'utime';
272 test 49, $@ =~ /^Insecure dependency/, $@;
274 if ($Config{d_chown}) {
275 test 50, eval { chown -1, -1, $TAINT } eq '', 'chown';
276 test 51, $@ =~ /^Insecure dependency/, $@;
279 print "# chown() is not available\n";
280 for (50..51) { print "ok $_\n" }
283 if ($Config{d_link}) {
284 test 52, eval { link $TAINT, '' } eq '', 'link';
285 test 53, $@ =~ /^Insecure dependency/, $@;
288 print "# link() is not available\n";
289 for (52..53) { print "ok $_\n" }
292 if ($Config{d_symlink}) {
293 test 54, eval { symlink $TAINT, '' } eq '', 'symlink';
294 test 55, $@ =~ /^Insecure dependency/, $@;
297 print "# symlink() is not available\n";
298 for (54..55) { print "ok $_\n" }
302 # Operations which affect directories can't use tainted data.
304 test 56, eval { mkdir $TAINT0, $TAINT } eq '', 'mkdir';
305 test 57, $@ =~ /^Insecure dependency/, $@;
307 test 58, eval { rmdir $TAINT } eq '', 'rmdir';
308 test 59, $@ =~ /^Insecure dependency/, $@;
310 test 60, eval { chdir $TAINT } eq '', 'chdir';
311 test 61, $@ =~ /^Insecure dependency/, $@;
313 if ($Config{d_chroot}) {
314 test 62, eval { chroot $TAINT } eq '', 'chroot';
315 test 63, $@ =~ /^Insecure dependency/, $@;
318 print "# chroot() is not available\n";
319 for (62..63) { print "ok $_\n" }
323 # Some operations using files can't use tainted data.
325 my $foo = "imaginary library" . $TAINT;
326 test 64, eval { require $foo } eq '', 'require';
327 test 65, $@ =~ /^Insecure dependency/, $@;
329 my $filename = "./taintB$$"; # NB: $filename isn't tainted!
330 END { unlink $filename if defined $filename }
331 $foo = $filename . $TAINT;
332 unlink $filename; # in any case
334 test 66, eval { open FOO, $foo } eq '', 'open for read';
335 test 67, $@ eq '', $@; # NB: This should be allowed
336 test 68, $! == 2; # File not found
338 test 69, eval { open FOO, "> $foo" } eq '', 'open for write';
339 test 70, $@ =~ /^Insecure dependency/, $@;
342 # Commands to the system can't use tainted data
346 if ($^O eq 'amigaos') {
347 print "# open(\"|\") is not available\n";
348 for (71..74) { print "ok $_\n" }
351 test 71, eval { open FOO, "| $foo" } eq '', 'popen to';
352 test 72, $@ =~ /^Insecure dependency/, $@;
354 test 73, eval { open FOO, "$foo |" } eq '', 'popen from';
355 test 74, $@ =~ /^Insecure dependency/, $@;
358 test 75, eval { exec $TAINT } eq '', 'exec';
359 test 76, $@ =~ /^Insecure dependency/, $@;
361 test 77, eval { system $TAINT } eq '', 'system';
362 test 78, $@ =~ /^Insecure dependency/, $@;
367 test 79, eval { `$echo 1$foo` } eq '', 'backticks';
368 test 80, $@ =~ /^Insecure dependency/, $@;
370 if ($Is_VMS) { # wildcard expansion doesn't invoke shell, so is safe
371 test 81, join('', eval { glob $foo } ) ne '', 'globbing';
372 test 82, $@ eq '', $@;
375 test 81, join('', eval { glob $foo } ) eq '', 'globbing';
376 test 82, $@ =~ /^Insecure dependency/, $@;
380 # Operations which affect processes can't use tainted data.
382 test 83, eval { kill 0, $TAINT } eq '', 'kill';
383 test 84, $@ =~ /^Insecure dependency/, $@;
385 if ($Config{d_setpgrp}) {
386 test 85, eval { setpgrp 0, $TAINT } eq '', 'setpgrp';
387 test 86, $@ =~ /^Insecure dependency/, $@;
390 print "# setpgrp() is not available\n";
391 for (85..86) { print "ok $_\n" }
394 if ($Config{d_setprior}) {
395 test 87, eval { setpriority 0, $TAINT, $TAINT } eq '', 'setpriority';
396 test 88, $@ =~ /^Insecure dependency/, $@;
399 print "# setpriority() is not available\n";
400 for (87..88) { print "ok $_\n" }
404 # Some miscellaneous operations can't use tainted data.
406 if ($Config{d_syscall}) {
407 test 89, eval { syscall $TAINT } eq '', 'syscall';
408 test 90, $@ =~ /^Insecure dependency/, $@;
411 print "# syscall() is not available\n";
412 for (89..90) { print "ok $_\n" }
419 my $temp = "./taintC$$";
421 test 91, open(FOO, "> $temp"), "Couldn't open $temp for write: $!";
423 test 92, eval { ioctl FOO, $TAINT, $foo } eq '', 'ioctl';
424 test 93, $@ =~ /^Insecure dependency/, $@;
426 if ($Config{d_fcntl}) {
427 test 94, eval { fcntl FOO, $TAINT, $foo } eq '', 'fcntl';
428 test 95, $@ =~ /^Insecure dependency/, $@;
431 print "# fcntl() is not available\n";
432 for (94..95) { print "ok $_\n" }
439 # Some tests involving references
441 my $foo = 'abc' . $TAINT;
443 test 96, not tainted $fooref;
444 test 97, tainted $$fooref;
445 test 98, tainted $foo;
448 # Some tests involving assignment
452 test 99, all_tainted $foo, $bar;
453 test 100, tainted($foo = $bar);
454 test 101, tainted($bar = $bar);
455 test 102, tainted($bar += $bar);
456 test 103, tainted($bar -= $bar);
457 test 104, tainted($bar *= $bar);
458 test 105, tainted($bar++);
459 test 106, tainted($bar /= $bar);
460 test 107, tainted($bar += 0);
461 test 108, tainted($bar -= 2);
462 test 109, tainted($bar *= -1);
463 test 110, tainted($bar /= 1);
464 test 111, tainted($bar--);