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