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