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[perl5.git] / t / op / taint.t
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1#!./perl -T
2#
3# Taint tests by Tom Phoenix <rootbeer@teleport.com>.
4#
5# I don't claim to know all about tainting. If anyone sees
9607fc9c 6# tests that I've missed here, please add them. But this is
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7# better than having no tests at all, right?
8#
9
10BEGIN {
11 chdir 't' if -d 't';
12 @INC = '../lib' if -d '../lib';
13}
14
15use strict;
16use Config;
17
18my $Is_VMS = $^O eq 'VMS';
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19my $Is_MSWin32 = $^O eq 'MSWin32';
20my $Invoke_Perl = $Is_VMS ? 'MCR Sys$Disk:[]Perl.' :
21 $Is_MSWin32 ? '.\perl' : './perl';
1e422769 22if ($Is_VMS) {
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23 my ($olddcl) = $ENV{'DCL$PATH'} =~ /^(.*)$/;
24 my ($oldifs) = $ENV{IFS} =~ /^(.*)$/;
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25 eval <<EndOfCleanup;
26 END {
27 \$ENV{PATH} = '';
28 warn "# Note: logical name 'PATH' may have been deleted\n";
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29 \$ENV{IFS} = \$oldifs;
30 \$ENV{'DCL\$PATH'} = \$olddcl;
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31 }
32EndOfCleanup
33}
34
35# Sources of taint:
36# The empty tainted value, for tainting strings
37my $TAINT = substr($^X, 0, 0);
38# A tainted zero, useful for tainting numbers
39my $TAINT0 = 0 + $TAINT;
40
41# This taints each argument passed. All must be lvalues.
42# Side effect: It also stringifies them. :-(
43sub taint_these (@) {
44 for (@_) { $_ .= $TAINT }
45}
46
47# How to identify taint when you see it
48sub any_tainted (@) {
49 not eval { join("",@_), kill 0; 1 };
50}
51sub tainted ($) {
52 any_tainted @_;
53}
54sub all_tainted (@) {
55 for (@_) { return 0 unless tainted $_ }
56 1;
57}
58
59sub test ($$;$) {
60 my($serial, $boolean, $diag) = @_;
61 if ($boolean) {
62 print "ok $serial\n";
63 } else {
64 print "not ok $serial\n";
65 for (split m/^/m, $diag) {
66 print "# $_";
67 }
9607fc9c 68 print "\n" unless
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69 $diag eq ''
70 or substr($diag, -1) eq "\n";
71 }
72}
73
74# We need an external program to call.
5aabfad6 75my $ECHO = ($Is_MSWin32 ? ".\\echo$$" : "./echo$$");
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76END { unlink $ECHO }
77open PROG, "> $ECHO" or die "Can't create $ECHO: $!";
78print PROG 'print "@ARGV\n"', "\n";
79close PROG;
80my $echo = "$Invoke_Perl $ECHO";
81
54310121 82print "1..112\n";
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83
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.
87{
88 $ENV{'DCL$PATH'} = '' if $Is_VMS;
89
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90 if ($Is_MSWin32) {
91 print "# PATH/IFS tainting tests skipped\n";
92 for (1..4) { print "ok $_\n" }
93 }
94 else {
95 $ENV{PATH} = $TAINT;
96 $ENV{IFS} = " \t\n";
97 test 1, eval { `$echo 1` } eq '';
98 test 2, $@ =~ /^Insecure \$ENV{PATH}/, $@;
1e422769 99
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100 $ENV{PATH} = '';
101 $ENV{IFS} = $TAINT;
102 test 3, eval { `$echo 1` } eq '';
103 test 4, $@ =~ /^Insecure \$ENV{IFS}/, $@;
104 }
9607fc9c 105 my $tmp;
5aabfad6 106 if ($^O eq 'os2' || $^O eq 'amigaos' || $Is_MSWin32) {
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107 print "# all directories are writeable\n";
108 }
109 else {
110 $tmp = (grep { defined and -d and (stat _)[2] & 2 }
111 qw(/tmp /var/tmp /usr/tmp /sys$scratch),
112 @ENV{qw(TMP TEMP)})[0]
113 or print "# can't find world-writeable directory to test PATH\n";
114 }
115
385588b3 116 if ($tmp) {
1e422769 117 $ENV{PATH} = $tmp;
9607fc9c 118 $ENV{IFS} = " \t\n";
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119 test 5, eval { `$echo 1` } eq '';
120 test 6, $@ =~ /^Insecure directory in \$ENV{PATH}/, $@;
121 }
122 else {
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123 for (5..6) { print "ok $_\n" }
124 }
125
126 $ENV{PATH} = '';
9607fc9c 127 $ENV{IFS} = " \t\n";
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128 test 7, eval { `$echo 1` } eq "1\n";
129 test 8, $@ eq '', $@;
130
131 if ($Is_VMS) {
132 $ENV{'DCL$PATH'} = $TAINT;
133 test 9, eval { `$echo 1` } eq '';
134 test 10, $@ =~ /^Insecure \$ENV{DCL\$PATH}/, $@;
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135 if ($tmp) {
136 $ENV{'DCL$PATH'} = $tmp;
137 test 11, eval { `$echo 1` } eq '';
138 test 12, $@ =~ /^Insecure directory in \$ENV{DCL\$PATH}/, $@;
139 }
140 else {
141 print "# can't find world-writeable directory to test DCL\$PATH\n";
142 for (11..12) { print "ok $_\n" }
143 }
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144 $ENV{'DCL$PATH'} = '';
145 }
146 else {
147 print "# This is not VMS\n";
9607fc9c 148 for (9..12) { print "ok $_\n"; }
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149 }
150}
151
152# Let's see that we can taint and untaint as needed.
153{
154 my $foo = $TAINT;
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155 test 13, tainted $foo;
156
157 # That was a sanity check. If it failed, stop the insanity!
158 die "Taint checks don't seem to be enabled" unless tainted $foo;
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159
160 $foo = "foo";
9607fc9c 161 test 14, not tainted $foo;
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162
163 taint_these($foo);
9607fc9c 164 test 15, tainted $foo;
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165
166 my @list = 1..10;
9607fc9c 167 test 16, not any_tainted @list;
1e422769 168 taint_these @list[1,3,5,7,9];
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169 test 17, any_tainted @list;
170 test 18, all_tainted @list[1,3,5,7,9];
171 test 19, not any_tainted @list[0,2,4,6,8];
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172
173 ($foo) = $foo =~ /(.+)/;
9607fc9c 174 test 20, not tainted $foo;
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175
176 $foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
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177 test 21, not tainted $foo;
178 test 22, $foo eq 'bar';
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179
180 my $pi = 4 * atan2(1,1) + $TAINT0;
9607fc9c 181 test 23, tainted $pi;
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182
183 ($pi) = $pi =~ /(\d+\.\d+)/;
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184 test 24, not tainted $pi;
185 test 25, sprintf("%.5f", $pi) eq '3.14159';
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186}
187
188# How about command-line arguments? The problem is that we don't
189# always get some, so we'll run another process with some.
190{
191 my $arg = "./arg$$";
192 open PROG, "> $arg" or die "Can't create $arg: $!";
193 print PROG q{
194 eval { join('', @ARGV), kill 0 };
195 exit 0 if $@ =~ /^Insecure dependency/;
196 print "# Oops: \$@ was [$@]\n";
197 exit 1;
198 };
199 close PROG;
200 print `$Invoke_Perl "-T" $arg and some suspect arguments`;
9607fc9c 201 test 26, !$?, "Exited with status $?";
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202 unlink $arg;
203}
204
205# Reading from a file should be tainted
206{
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207 my $file = './TEST';
208 test 27, open(FILE, $file), "Couldn't open '$file': $!";
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209
210 my $block;
211 sysread(FILE, $block, 100);
9607fc9c 212 my $line = <FILE>;
1e422769 213 close FILE;
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214 test 28, tainted $block;
215 test 29, tainted $line;
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216}
217
9607fc9c 218# Globs should be tainted.
1e422769 219{
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220 # Some glob implementations need to spawn system programs.
221 local $ENV{PATH} = '';
222 $ENV{PATH} = (-l '/bin' ? '' : '/bin:') . '/usr/bin' unless $Is_VMS;
223
1e422769 224 my @globs = <*>;
9607fc9c 225 test 30, all_tainted @globs;
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226
227 @globs = glob '*';
9607fc9c 228 test 31, all_tainted @globs;
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229}
230
231# Output of commands should be tainted
232{
233 my $foo = `$echo abc`;
9607fc9c 234 test 32, tainted $foo;
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235}
236
237# Certain system variables should be tainted
238{
9607fc9c 239 test 33, all_tainted $^X, $0;
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240}
241
242# Results of matching should all be untainted
243{
244 my $foo = "abcdefghi" . $TAINT;
9607fc9c 245 test 34, tainted $foo;
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246
247 $foo =~ /def/;
9607fc9c 248 test 35, not any_tainted $`, $&, $';
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249
250 $foo =~ /(...)(...)(...)/;
9607fc9c 251 test 36, not any_tainted $1, $2, $3, $+;
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252
253 my @bar = $foo =~ /(...)(...)(...)/;
9607fc9c 254 test 37, not any_tainted @bar;
1e422769 255
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256 test 38, tainted $foo; # $foo should still be tainted!
257 test 39, $foo eq "abcdefghi";
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258}
259
260# Operations which affect files can't use tainted data.
261{
9607fc9c 262 test 40, eval { chmod 0, $TAINT } eq '', 'chmod';
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263 test 41, $@ =~ /^Insecure dependency/, $@;
264
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265 # There is no feature test in $Config{} for truncate,
266 # so we allow for the possibility that it's missing.
267 test 42, eval { truncate 'NoSuChFiLe', $TAINT0 } eq '', 'truncate';
268 test 43, $@ =~ /^(?:Insecure dependency|truncate not implemented)/, $@;
1e422769 269
9607fc9c 270 test 44, eval { rename '', $TAINT } eq '', 'rename';
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271 test 45, $@ =~ /^Insecure dependency/, $@;
272
9607fc9c 273 test 46, eval { unlink $TAINT } eq '', 'unlink';
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274 test 47, $@ =~ /^Insecure dependency/, $@;
275
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276 test 48, eval { utime $TAINT } eq '', 'utime';
277 test 49, $@ =~ /^Insecure dependency/, $@;
278
1e422769 279 if ($Config{d_chown}) {
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280 test 50, eval { chown -1, -1, $TAINT } eq '', 'chown';
281 test 51, $@ =~ /^Insecure dependency/, $@;
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282 }
283 else {
284 print "# chown() is not available\n";
9607fc9c 285 for (50..51) { print "ok $_\n" }
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286 }
287
288 if ($Config{d_link}) {
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289 test 52, eval { link $TAINT, '' } eq '', 'link';
290 test 53, $@ =~ /^Insecure dependency/, $@;
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291 }
292 else {
293 print "# link() is not available\n";
9607fc9c 294 for (52..53) { print "ok $_\n" }
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295 }
296
297 if ($Config{d_symlink}) {
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298 test 54, eval { symlink $TAINT, '' } eq '', 'symlink';
299 test 55, $@ =~ /^Insecure dependency/, $@;
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300 }
301 else {
302 print "# symlink() is not available\n";
9607fc9c 303 for (54..55) { print "ok $_\n" }
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304 }
305}
306
307# Operations which affect directories can't use tainted data.
308{
9607fc9c 309 test 56, eval { mkdir $TAINT0, $TAINT } eq '', 'mkdir';
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310 test 57, $@ =~ /^Insecure dependency/, $@;
311
9607fc9c 312 test 58, eval { rmdir $TAINT } eq '', 'rmdir';
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313 test 59, $@ =~ /^Insecure dependency/, $@;
314
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315 test 60, eval { chdir $TAINT } eq '', 'chdir';
316 test 61, $@ =~ /^Insecure dependency/, $@;
317
1e422769 318 if ($Config{d_chroot}) {
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319 test 62, eval { chroot $TAINT } eq '', 'chroot';
320 test 63, $@ =~ /^Insecure dependency/, $@;
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321 }
322 else {
323 print "# chroot() is not available\n";
9607fc9c 324 for (62..63) { print "ok $_\n" }
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325 }
326}
327
328# Some operations using files can't use tainted data.
329{
330 my $foo = "imaginary library" . $TAINT;
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331 test 64, eval { require $foo } eq '', 'require';
332 test 65, $@ =~ /^Insecure dependency/, $@;
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333
334 my $filename = "./taintB$$"; # NB: $filename isn't tainted!
335 END { unlink $filename if defined $filename }
336 $foo = $filename . $TAINT;
337 unlink $filename; # in any case
338
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339 test 66, eval { open FOO, $foo } eq '', 'open for read';
340 test 67, $@ eq '', $@; # NB: This should be allowed
341 test 68, $! == 2; # File not found
1e422769 342
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343 test 69, eval { open FOO, "> $foo" } eq '', 'open for write';
344 test 70, $@ =~ /^Insecure dependency/, $@;
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345}
346
347# Commands to the system can't use tainted data
348{
349 my $foo = $TAINT;
350
351 if ($^O eq 'amigaos') {
352 print "# open(\"|\") is not available\n";
9607fc9c 353 for (71..74) { print "ok $_\n" }
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354 }
355 else {
9607fc9c 356 test 71, eval { open FOO, "| $foo" } eq '', 'popen to';
1e422769 357 test 72, $@ =~ /^Insecure dependency/, $@;
1e422769 358
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359 test 73, eval { open FOO, "$foo |" } eq '', 'popen from';
360 test 74, $@ =~ /^Insecure dependency/, $@;
361 }
1e422769 362
9607fc9c 363 test 75, eval { exec $TAINT } eq '', 'exec';
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364 test 76, $@ =~ /^Insecure dependency/, $@;
365
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366 test 77, eval { system $TAINT } eq '', 'system';
367 test 78, $@ =~ /^Insecure dependency/, $@;
368
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369 $foo = "*";
370 taint_these $foo;
371
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372 test 79, eval { `$echo 1$foo` } eq '', 'backticks';
373 test 80, $@ =~ /^Insecure dependency/, $@;
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374
375 if ($Is_VMS) { # wildcard expansion doesn't invoke shell, so is safe
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376 test 81, join('', eval { glob $foo } ) ne '', 'globbing';
377 test 82, $@ eq '', $@;
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378 }
379 else {
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380 test 81, join('', eval { glob $foo } ) eq '', 'globbing';
381 test 82, $@ =~ /^Insecure dependency/, $@;
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382 }
383}
384
385# Operations which affect processes can't use tainted data.
386{
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387 test 83, eval { kill 0, $TAINT } eq '', 'kill';
388 test 84, $@ =~ /^Insecure dependency/, $@;
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389
390 if ($Config{d_setpgrp}) {
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391 test 85, eval { setpgrp 0, $TAINT } eq '', 'setpgrp';
392 test 86, $@ =~ /^Insecure dependency/, $@;
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393 }
394 else {
395 print "# setpgrp() is not available\n";
9607fc9c 396 for (85..86) { print "ok $_\n" }
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397 }
398
399 if ($Config{d_setprior}) {
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400 test 87, eval { setpriority 0, $TAINT, $TAINT } eq '', 'setpriority';
401 test 88, $@ =~ /^Insecure dependency/, $@;
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402 }
403 else {
404 print "# setpriority() is not available\n";
9607fc9c 405 for (87..88) { print "ok $_\n" }
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406 }
407}
408
409# Some miscellaneous operations can't use tainted data.
410{
411 if ($Config{d_syscall}) {
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412 test 89, eval { syscall $TAINT } eq '', 'syscall';
413 test 90, $@ =~ /^Insecure dependency/, $@;
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414 }
415 else {
416 print "# syscall() is not available\n";
9607fc9c 417 for (89..90) { print "ok $_\n" }
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418 }
419
420 {
421 my $foo = "x" x 979;
422 taint_these $foo;
423 local *FOO;
424 my $temp = "./taintC$$";
425 END { unlink $temp }
9607fc9c 426 test 91, open(FOO, "> $temp"), "Couldn't open $temp for write: $!";
1e422769 427
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428 test 92, eval { ioctl FOO, $TAINT, $foo } eq '', 'ioctl';
429 test 93, $@ =~ /^Insecure dependency/, $@;
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430
431 if ($Config{d_fcntl}) {
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432 test 94, eval { fcntl FOO, $TAINT, $foo } eq '', 'fcntl';
433 test 95, $@ =~ /^Insecure dependency/, $@;
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434 }
435 else {
436 print "# fcntl() is not available\n";
9607fc9c 437 for (94..95) { print "ok $_\n" }
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438 }
439
440 close FOO;
441 }
442}
443
9607fc9c 444# Some tests involving references
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445{
446 my $foo = 'abc' . $TAINT;
447 my $fooref = \$foo;
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448 test 96, not tainted $fooref;
449 test 97, tainted $$fooref;
450 test 98, tainted $foo;
1e422769 451}
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452
453# Some tests involving assignment
454{
455 my $foo = $TAINT0;
456 my $bar = $foo;
457 test 99, all_tainted $foo, $bar;
458 test 100, tainted($foo = $bar);
459 test 101, tainted($bar = $bar);
460 test 102, tainted($bar += $bar);
461 test 103, tainted($bar -= $bar);
462 test 104, tainted($bar *= $bar);
463 test 105, tainted($bar++);
464 test 106, tainted($bar /= $bar);
465 test 107, tainted($bar += 0);
466 test 108, tainted($bar -= 2);
467 test 109, tainted($bar *= -1);
468 test 110, tainted($bar /= 1);
469 test 111, tainted($bar--);
470 test 112, $bar == 0;
471}