Commit | Line | Data |
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 |
9607fc9c |
6 | # tests that I've missed here, please add them. But this is |
1e422769 |
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'; |
68dc0745 |
19 | my $Is_MSWin32 = $^O eq 'MSWin32'; |
20 | my $Invoke_Perl = $Is_VMS ? 'MCR Sys$Disk:[]Perl.' : |
21 | $Is_MSWin32 ? '.\perl' : './perl'; |
7bac28a0 |
22 | my @MoreEnv = qw/IFS ENV CDPATH TERM/; |
23 | |
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24 | if ($Is_VMS) { |
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25 | my (%old, $x); |
26 | for $x ('DCL$PATH', @MoreEnv) { |
27 | ($old{$x}) = $ENV{$x} =~ /^(.*)$/ if exists $ENV{$x}; |
28 | } |
1e422769 |
29 | eval <<EndOfCleanup; |
30 | END { |
31 | \$ENV{PATH} = ''; |
32 | warn "# Note: logical name 'PATH' may have been deleted\n"; |
7bac28a0 |
33 | @ENV{keys %old} = values %old; |
1e422769 |
34 | } |
35 | EndOfCleanup |
36 | } |
37 | |
38 | # Sources of taint: |
39 | # The empty tainted value, for tainting strings |
40 | my $TAINT = substr($^X, 0, 0); |
41 | # A tainted zero, useful for tainting numbers |
42 | my $TAINT0 = 0 + $TAINT; |
43 | |
44 | # This taints each argument passed. All must be lvalues. |
45 | # Side effect: It also stringifies them. :-( |
46 | sub taint_these (@) { |
47 | for (@_) { $_ .= $TAINT } |
48 | } |
49 | |
50 | # How to identify taint when you see it |
51 | sub any_tainted (@) { |
52 | not eval { join("",@_), kill 0; 1 }; |
53 | } |
54 | sub tainted ($) { |
55 | any_tainted @_; |
56 | } |
57 | sub all_tainted (@) { |
58 | for (@_) { return 0 unless tainted $_ } |
59 | 1; |
60 | } |
61 | |
62 | sub test ($$;$) { |
63 | my($serial, $boolean, $diag) = @_; |
64 | if ($boolean) { |
65 | print "ok $serial\n"; |
66 | } else { |
67 | print "not ok $serial\n"; |
68 | for (split m/^/m, $diag) { |
69 | print "# $_"; |
70 | } |
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71 | print "\n" unless |
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72 | $diag eq '' |
73 | or substr($diag, -1) eq "\n"; |
74 | } |
75 | } |
76 | |
77 | # We need an external program to call. |
5aabfad6 |
78 | my $ECHO = ($Is_MSWin32 ? ".\\echo$$" : "./echo$$"); |
1e422769 |
79 | END { unlink $ECHO } |
80 | open PROG, "> $ECHO" or die "Can't create $ECHO: $!"; |
81 | print PROG 'print "@ARGV\n"', "\n"; |
82 | close PROG; |
83 | my $echo = "$Invoke_Perl $ECHO"; |
84 | |
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85 | print "1..132\n"; |
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86 | |
87 | # First, let's make sure that Perl is checking the dangerous |
88 | # environment variables. Maybe they aren't set yet, so we'll |
89 | # taint them ourselves. |
90 | { |
91 | $ENV{'DCL$PATH'} = '' if $Is_VMS; |
92 | |
7bac28a0 |
93 | $ENV{PATH} = ''; |
94 | delete $ENV{IFS}; |
95 | delete $ENV{ENV}; |
96 | delete $ENV{CDPATH}; |
97 | $ENV{TERM} = 'dumb'; |
98 | |
99 | test 1, eval { `$echo 1` } eq "1\n"; |
100 | |
5aabfad6 |
101 | if ($Is_MSWin32) { |
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102 | print "# Environment tainting tests skipped\n"; |
103 | for (2) { print "ok $_\n" } |
5aabfad6 |
104 | } |
105 | else { |
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106 | my @vars = ('PATH', @MoreEnv); |
107 | while (my $v = $vars[0]) { |
108 | local $ENV{$v} = $TAINT; |
109 | last if eval { `$echo 1` }; |
110 | last unless $@ =~ /^Insecure \$ENV{$v}/; |
111 | shift @vars; |
112 | } |
113 | test 2, !@vars, "\$$vars[0]"; |
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114 | } |
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115 | |
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116 | my $tmp; |
5aabfad6 |
117 | if ($^O eq 'os2' || $^O eq 'amigaos' || $Is_MSWin32) { |
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118 | print "# all directories are writeable\n"; |
119 | } |
120 | else { |
121 | $tmp = (grep { defined and -d and (stat _)[2] & 2 } |
122 | qw(/tmp /var/tmp /usr/tmp /sys$scratch), |
123 | @ENV{qw(TMP TEMP)})[0] |
124 | or print "# can't find world-writeable directory to test PATH\n"; |
125 | } |
126 | |
385588b3 |
127 | if ($tmp) { |
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128 | local $ENV{PATH} = $tmp; |
129 | test 3, eval { `$echo 1` } eq ''; |
130 | test 4, $@ =~ /^Insecure directory in \$ENV{PATH}/, $@; |
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131 | } |
132 | else { |
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133 | for (3..4) { print "ok $_\n" } |
1e422769 |
134 | } |
135 | |
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136 | if ($Is_VMS) { |
137 | $ENV{'DCL$PATH'} = $TAINT; |
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138 | test 5, eval { `$echo 1` } eq ''; |
139 | test 6, $@ =~ /^Insecure \$ENV{DCL\$PATH}/, $@; |
9607fc9c |
140 | if ($tmp) { |
141 | $ENV{'DCL$PATH'} = $tmp; |
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142 | test 7, eval { `$echo 1` } eq ''; |
143 | test 8, $@ =~ /^Insecure directory in \$ENV{DCL\$PATH}/, $@; |
9607fc9c |
144 | } |
145 | else { |
146 | print "# can't find world-writeable directory to test DCL\$PATH\n"; |
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147 | for (7..8) { print "ok $_\n" } |
9607fc9c |
148 | } |
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149 | $ENV{'DCL$PATH'} = ''; |
150 | } |
151 | else { |
152 | print "# This is not VMS\n"; |
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153 | for (5..8) { print "ok $_\n"; } |
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154 | } |
155 | } |
156 | |
157 | # Let's see that we can taint and untaint as needed. |
158 | { |
159 | my $foo = $TAINT; |
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160 | test 9, tainted $foo; |
9607fc9c |
161 | |
162 | # That was a sanity check. If it failed, stop the insanity! |
163 | die "Taint checks don't seem to be enabled" unless tainted $foo; |
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164 | |
165 | $foo = "foo"; |
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166 | test 10, not tainted $foo; |
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167 | |
168 | taint_these($foo); |
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169 | test 11, tainted $foo; |
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170 | |
171 | my @list = 1..10; |
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172 | test 12, not any_tainted @list; |
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173 | taint_these @list[1,3,5,7,9]; |
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174 | test 13, any_tainted @list; |
175 | test 14, all_tainted @list[1,3,5,7,9]; |
176 | test 15, not any_tainted @list[0,2,4,6,8]; |
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177 | |
178 | ($foo) = $foo =~ /(.+)/; |
7bac28a0 |
179 | test 16, not tainted $foo; |
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180 | |
181 | $foo = $1 if ('bar' . $TAINT) =~ /(.+)/; |
7bac28a0 |
182 | test 17, not tainted $foo; |
183 | test 18, $foo eq 'bar'; |
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184 | |
185 | my $pi = 4 * atan2(1,1) + $TAINT0; |
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186 | test 19, tainted $pi; |
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187 | |
188 | ($pi) = $pi =~ /(\d+\.\d+)/; |
7bac28a0 |
189 | test 20, not tainted $pi; |
190 | test 21, sprintf("%.5f", $pi) eq '3.14159'; |
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191 | } |
192 | |
193 | # How about command-line arguments? The problem is that we don't |
194 | # always get some, so we'll run another process with some. |
195 | { |
196 | my $arg = "./arg$$"; |
197 | open PROG, "> $arg" or die "Can't create $arg: $!"; |
198 | print PROG q{ |
199 | eval { join('', @ARGV), kill 0 }; |
200 | exit 0 if $@ =~ /^Insecure dependency/; |
201 | print "# Oops: \$@ was [$@]\n"; |
202 | exit 1; |
203 | }; |
204 | close PROG; |
205 | print `$Invoke_Perl "-T" $arg and some suspect arguments`; |
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206 | test 22, !$?, "Exited with status $?"; |
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207 | unlink $arg; |
208 | } |
209 | |
210 | # Reading from a file should be tainted |
211 | { |
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212 | my $file = './TEST'; |
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213 | test 23, open(FILE, $file), "Couldn't open '$file': $!"; |
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214 | |
215 | my $block; |
216 | sysread(FILE, $block, 100); |
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217 | my $line = <FILE>; |
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218 | close FILE; |
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219 | test 24, tainted $block; |
220 | test 25, tainted $line; |
1e422769 |
221 | } |
222 | |
7bac28a0 |
223 | # Globs should be forbidden. |
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224 | { |
9607fc9c |
225 | # Some glob implementations need to spawn system programs. |
226 | local $ENV{PATH} = ''; |
227 | $ENV{PATH} = (-l '/bin' ? '' : '/bin:') . '/usr/bin' unless $Is_VMS; |
228 | |
7bac28a0 |
229 | my @globs = eval { <*> }; |
230 | test 26, @globs == 0 && $@ =~ /^Insecure dependency/; |
1e422769 |
231 | |
7bac28a0 |
232 | @globs = eval { glob '*' }; |
233 | test 27, @globs == 0 && $@ =~ /^Insecure dependency/; |
1e422769 |
234 | } |
235 | |
236 | # Output of commands should be tainted |
237 | { |
238 | my $foo = `$echo abc`; |
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239 | test 28, tainted $foo; |
1e422769 |
240 | } |
241 | |
242 | # Certain system variables should be tainted |
243 | { |
7bac28a0 |
244 | test 29, all_tainted $^X, $0; |
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245 | } |
246 | |
247 | # Results of matching should all be untainted |
248 | { |
249 | my $foo = "abcdefghi" . $TAINT; |
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250 | test 30, tainted $foo; |
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251 | |
252 | $foo =~ /def/; |
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253 | test 31, not any_tainted $`, $&, $'; |
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254 | |
255 | $foo =~ /(...)(...)(...)/; |
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256 | test 32, not any_tainted $1, $2, $3, $+; |
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257 | |
258 | my @bar = $foo =~ /(...)(...)(...)/; |
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259 | test 33, not any_tainted @bar; |
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260 | |
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261 | test 34, tainted $foo; # $foo should still be tainted! |
262 | test 35, $foo eq "abcdefghi"; |
1e422769 |
263 | } |
264 | |
265 | # Operations which affect files can't use tainted data. |
266 | { |
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267 | test 36, eval { chmod 0, $TAINT } eq '', 'chmod'; |
268 | test 37, $@ =~ /^Insecure dependency/, $@; |
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269 | |
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270 | # There is no feature test in $Config{} for truncate, |
271 | # so we allow for the possibility that it's missing. |
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272 | test 38, eval { truncate 'NoSuChFiLe', $TAINT0 } eq '', 'truncate'; |
273 | test 39, $@ =~ /^(?:Insecure dependency|truncate not implemented)/, $@; |
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274 | |
7bac28a0 |
275 | test 40, eval { rename '', $TAINT } eq '', 'rename'; |
276 | test 41, $@ =~ /^Insecure dependency/, $@; |
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277 | |
7bac28a0 |
278 | test 42, eval { unlink $TAINT } eq '', 'unlink'; |
279 | test 43, $@ =~ /^Insecure dependency/, $@; |
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280 | |
7bac28a0 |
281 | test 44, eval { utime $TAINT } eq '', 'utime'; |
282 | test 45, $@ =~ /^Insecure dependency/, $@; |
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283 | |
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284 | if ($Config{d_chown}) { |
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285 | test 46, eval { chown -1, -1, $TAINT } eq '', 'chown'; |
286 | test 47, $@ =~ /^Insecure dependency/, $@; |
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287 | } |
288 | else { |
289 | print "# chown() is not available\n"; |
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290 | for (46..47) { print "ok $_\n" } |
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291 | } |
292 | |
293 | if ($Config{d_link}) { |
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294 | test 48, eval { link $TAINT, '' } eq '', 'link'; |
295 | test 49, $@ =~ /^Insecure dependency/, $@; |
1e422769 |
296 | } |
297 | else { |
298 | print "# link() is not available\n"; |
7bac28a0 |
299 | for (48..49) { print "ok $_\n" } |
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300 | } |
301 | |
302 | if ($Config{d_symlink}) { |
7bac28a0 |
303 | test 50, eval { symlink $TAINT, '' } eq '', 'symlink'; |
304 | test 51, $@ =~ /^Insecure dependency/, $@; |
1e422769 |
305 | } |
306 | else { |
307 | print "# symlink() is not available\n"; |
7bac28a0 |
308 | for (50..51) { print "ok $_\n" } |
1e422769 |
309 | } |
310 | } |
311 | |
312 | # Operations which affect directories can't use tainted data. |
313 | { |
7bac28a0 |
314 | test 52, eval { mkdir $TAINT0, $TAINT } eq '', 'mkdir'; |
315 | test 53, $@ =~ /^Insecure dependency/, $@; |
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316 | |
7bac28a0 |
317 | test 54, eval { rmdir $TAINT } eq '', 'rmdir'; |
318 | test 55, $@ =~ /^Insecure dependency/, $@; |
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319 | |
7bac28a0 |
320 | test 56, eval { chdir $TAINT } eq '', 'chdir'; |
321 | test 57, $@ =~ /^Insecure dependency/, $@; |
9607fc9c |
322 | |
1e422769 |
323 | if ($Config{d_chroot}) { |
7bac28a0 |
324 | test 58, eval { chroot $TAINT } eq '', 'chroot'; |
325 | test 59, $@ =~ /^Insecure dependency/, $@; |
1e422769 |
326 | } |
327 | else { |
328 | print "# chroot() is not available\n"; |
7bac28a0 |
329 | for (58..59) { print "ok $_\n" } |
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330 | } |
331 | } |
332 | |
333 | # Some operations using files can't use tainted data. |
334 | { |
335 | my $foo = "imaginary library" . $TAINT; |
7bac28a0 |
336 | test 60, eval { require $foo } eq '', 'require'; |
337 | test 61, $@ =~ /^Insecure dependency/, $@; |
1e422769 |
338 | |
339 | my $filename = "./taintB$$"; # NB: $filename isn't tainted! |
340 | END { unlink $filename if defined $filename } |
341 | $foo = $filename . $TAINT; |
342 | unlink $filename; # in any case |
343 | |
7bac28a0 |
344 | test 62, eval { open FOO, $foo } eq '', 'open for read'; |
345 | test 63, $@ eq '', $@; # NB: This should be allowed |
346 | test 64, $! == 2; # File not found |
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347 | |
7bac28a0 |
348 | test 65, eval { open FOO, "> $foo" } eq '', 'open for write'; |
349 | test 66, $@ =~ /^Insecure dependency/, $@; |
1e422769 |
350 | } |
351 | |
352 | # Commands to the system can't use tainted data |
353 | { |
354 | my $foo = $TAINT; |
355 | |
356 | if ($^O eq 'amigaos') { |
357 | print "# open(\"|\") is not available\n"; |
7bac28a0 |
358 | for (67..70) { print "ok $_\n" } |
1e422769 |
359 | } |
360 | else { |
7bac28a0 |
361 | test 67, eval { open FOO, "| $foo" } eq '', 'popen to'; |
362 | test 68, $@ =~ /^Insecure dependency/, $@; |
1e422769 |
363 | |
7bac28a0 |
364 | test 69, eval { open FOO, "$foo |" } eq '', 'popen from'; |
365 | test 70, $@ =~ /^Insecure dependency/, $@; |
9607fc9c |
366 | } |
1e422769 |
367 | |
7bac28a0 |
368 | test 71, eval { exec $TAINT } eq '', 'exec'; |
369 | test 72, $@ =~ /^Insecure dependency/, $@; |
1e422769 |
370 | |
7bac28a0 |
371 | test 73, eval { system $TAINT } eq '', 'system'; |
372 | test 74, $@ =~ /^Insecure dependency/, $@; |
9607fc9c |
373 | |
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374 | $foo = "*"; |
375 | taint_these $foo; |
376 | |
7bac28a0 |
377 | test 75, eval { `$echo 1$foo` } eq '', 'backticks'; |
378 | test 76, $@ =~ /^Insecure dependency/, $@; |
1e422769 |
379 | |
380 | if ($Is_VMS) { # wildcard expansion doesn't invoke shell, so is safe |
7bac28a0 |
381 | test 77, join('', eval { glob $foo } ) ne '', 'globbing'; |
382 | test 78, $@ eq '', $@; |
1e422769 |
383 | } |
384 | else { |
7bac28a0 |
385 | test 77, join('', eval { glob $foo } ) eq '', 'globbing'; |
386 | test 78, $@ =~ /^Insecure dependency/, $@; |
1e422769 |
387 | } |
388 | } |
389 | |
390 | # Operations which affect processes can't use tainted data. |
391 | { |
7bac28a0 |
392 | test 79, eval { kill 0, $TAINT } eq '', 'kill'; |
393 | test 80, $@ =~ /^Insecure dependency/, $@; |
1e422769 |
394 | |
395 | if ($Config{d_setpgrp}) { |
7bac28a0 |
396 | test 81, eval { setpgrp 0, $TAINT } eq '', 'setpgrp'; |
397 | test 82, $@ =~ /^Insecure dependency/, $@; |
1e422769 |
398 | } |
399 | else { |
400 | print "# setpgrp() is not available\n"; |
7bac28a0 |
401 | for (81..82) { print "ok $_\n" } |
1e422769 |
402 | } |
403 | |
404 | if ($Config{d_setprior}) { |
7bac28a0 |
405 | test 83, eval { setpriority 0, $TAINT, $TAINT } eq '', 'setpriority'; |
406 | test 84, $@ =~ /^Insecure dependency/, $@; |
1e422769 |
407 | } |
408 | else { |
409 | print "# setpriority() is not available\n"; |
7bac28a0 |
410 | for (83..84) { print "ok $_\n" } |
1e422769 |
411 | } |
412 | } |
413 | |
414 | # Some miscellaneous operations can't use tainted data. |
415 | { |
416 | if ($Config{d_syscall}) { |
7bac28a0 |
417 | test 85, eval { syscall $TAINT } eq '', 'syscall'; |
418 | test 86, $@ =~ /^Insecure dependency/, $@; |
1e422769 |
419 | } |
420 | else { |
421 | print "# syscall() is not available\n"; |
7bac28a0 |
422 | for (85..86) { print "ok $_\n" } |
1e422769 |
423 | } |
424 | |
425 | { |
426 | my $foo = "x" x 979; |
427 | taint_these $foo; |
428 | local *FOO; |
429 | my $temp = "./taintC$$"; |
430 | END { unlink $temp } |
7bac28a0 |
431 | test 87, open(FOO, "> $temp"), "Couldn't open $temp for write: $!"; |
1e422769 |
432 | |
7bac28a0 |
433 | test 88, eval { ioctl FOO, $TAINT, $foo } eq '', 'ioctl'; |
434 | test 89, $@ =~ /^Insecure dependency/, $@; |
1e422769 |
435 | |
436 | if ($Config{d_fcntl}) { |
7bac28a0 |
437 | test 90, eval { fcntl FOO, $TAINT, $foo } eq '', 'fcntl'; |
438 | test 91, $@ =~ /^Insecure dependency/, $@; |
1e422769 |
439 | } |
440 | else { |
441 | print "# fcntl() is not available\n"; |
7bac28a0 |
442 | for (90..91) { print "ok $_\n" } |
1e422769 |
443 | } |
444 | |
445 | close FOO; |
446 | } |
447 | } |
448 | |
9607fc9c |
449 | # Some tests involving references |
1e422769 |
450 | { |
451 | my $foo = 'abc' . $TAINT; |
452 | my $fooref = \$foo; |
7bac28a0 |
453 | test 92, not tainted $fooref; |
454 | test 93, tainted $$fooref; |
455 | test 94, tainted $foo; |
1e422769 |
456 | } |
54310121 |
457 | |
458 | # Some tests involving assignment |
459 | { |
460 | my $foo = $TAINT0; |
461 | my $bar = $foo; |
7bac28a0 |
462 | test 95, all_tainted $foo, $bar; |
463 | test 96, tainted($foo = $bar); |
464 | test 97, tainted($bar = $bar); |
465 | test 98, tainted($bar += $bar); |
466 | test 99, tainted($bar -= $bar); |
467 | test 100, tainted($bar *= $bar); |
468 | test 101, tainted($bar++); |
469 | test 102, tainted($bar /= $bar); |
470 | test 103, tainted($bar += 0); |
471 | test 104, tainted($bar -= 2); |
472 | test 105, tainted($bar *= -1); |
473 | test 106, tainted($bar /= 1); |
474 | test 107, tainted($bar--); |
475 | test 108, $bar == 0; |
54310121 |
476 | } |
a1f49e72 |
477 | |
478 | # Test assignment and return of lists |
479 | { |
480 | my @foo = ("A", "tainted" . $TAINT, "B"); |
7bac28a0 |
481 | test 109, not tainted $foo[0]; |
482 | test 110, tainted $foo[1]; |
483 | test 111, not tainted $foo[2]; |
a1f49e72 |
484 | my @bar = @foo; |
7bac28a0 |
485 | test 112, not tainted $bar[0]; |
486 | test 113, tainted $bar[1]; |
487 | test 114, not tainted $bar[2]; |
a1f49e72 |
488 | my @baz = eval { "A", "tainted" . $TAINT, "B" }; |
7bac28a0 |
489 | test 115, not tainted $baz[0]; |
490 | test 116, tainted $baz[1]; |
491 | test 117, not tainted $baz[2]; |
a1f49e72 |
492 | my @plugh = eval q[ "A", "tainted" . $TAINT, "B" ]; |
7bac28a0 |
493 | test 118, not tainted $plugh[0]; |
494 | test 119, tainted $plugh[1]; |
495 | test 120, not tainted $plugh[2]; |
a1f49e72 |
496 | my $nautilus = sub { "A", "tainted" . $TAINT, "B" }; |
7bac28a0 |
497 | test 121, not tainted ((&$nautilus)[0]); |
498 | test 122, tainted ((&$nautilus)[1]); |
499 | test 123, not tainted ((&$nautilus)[2]); |
a1f49e72 |
500 | my @xyzzy = &$nautilus; |
7bac28a0 |
501 | test 124, not tainted $xyzzy[0]; |
502 | test 125, tainted $xyzzy[1]; |
503 | test 126, not tainted $xyzzy[2]; |
a1f49e72 |
504 | my $red_october = sub { return "A", "tainted" . $TAINT, "B" }; |
7bac28a0 |
505 | test 127, not tainted ((&$red_october)[0]); |
506 | test 128, tainted ((&$red_october)[1]); |
507 | test 129, not tainted ((&$red_october)[2]); |
a1f49e72 |
508 | my @corge = &$red_october; |
7bac28a0 |
509 | test 130, not tainted $corge[0]; |
510 | test 131, tainted $corge[1]; |
511 | test 132, not tainted $corge[2]; |
a1f49e72 |
512 | } |