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|
#!./perl -T
#
# Taint tests by Tom Phoenix <rootbeer@teleport.com>.
#
# I don't claim to know all about tainting. If anyone sees
# tests that I've missed here, please add them. But this is
# better than having no tests at all, right?
#
BEGIN {
chdir 't' if -d 't';
@INC = '../lib';
}
use strict;
use Config;
use File::Spec::Functions;
BEGIN { require './test.pl'; }
plan tests => 238;
$| = 1;
use vars qw($ipcsysv); # did we manage to load IPC::SysV?
BEGIN {
if ($^O eq 'VMS' && !defined($Config{d_setenv})) {
$ENV{PATH} = $ENV{PATH};
$ENV{TERM} = $ENV{TERM} ne ''? $ENV{TERM} : 'dummy';
}
if ($Config{'extensions'} =~ /\bIPC\/SysV\b/
&& ($Config{d_shm} || $Config{d_msg})) {
eval { require IPC::SysV };
unless ($@) {
$ipcsysv++;
IPC::SysV->import(qw(IPC_PRIVATE IPC_RMID IPC_CREAT S_IRWXU IPC_NOWAIT));
}
}
}
my $Is_MacOS = $^O eq 'MacOS';
my $Is_VMS = $^O eq 'VMS';
my $Is_MSWin32 = $^O eq 'MSWin32';
my $Is_NetWare = $^O eq 'NetWare';
my $Is_Dos = $^O eq 'dos';
my $Is_Cygwin = $^O eq 'cygwin';
my $Invoke_Perl = $Is_VMS ? 'MCR Sys$Disk:[]Perl.' :
$Is_MSWin32 ? '.\perl' :
$Is_MacOS ? ':perl' :
$Is_NetWare ? 'perl' :
'./perl' ;
my @MoreEnv = qw/IFS CDPATH ENV BASH_ENV/;
if ($Is_VMS) {
my (%old, $x);
for $x ('DCL$PATH', @MoreEnv) {
($old{$x}) = $ENV{$x} =~ /^(.*)$/ if exists $ENV{$x};
}
eval <<EndOfCleanup;
END {
\$ENV{PATH} = '' if $Config{d_setenv};
warn "# Note: logical name 'PATH' may have been deleted\n";
\@ENV{keys %old} = values %old;
}
EndOfCleanup
}
# Sources of taint:
# The empty tainted value, for tainting strings
my $TAINT = substr($^X, 0, 0);
# A tainted zero, useful for tainting numbers
my $TAINT0;
{
no warnings;
$TAINT0 = 0 + $TAINT;
}
# This taints each argument passed. All must be lvalues.
# Side effect: It also stringifies them. :-(
sub taint_these (@) {
for (@_) { $_ .= $TAINT }
}
# How to identify taint when you see it
sub any_tainted (@) {
not eval { join("",@_), kill 0; 1 };
}
sub tainted ($) {
any_tainted @_;
}
sub all_tainted (@) {
for (@_) { return 0 unless tainted $_ }
1;
}
sub test ($;$) {
my($ok, $diag) = @_;
my $curr_test = curr_test();
if ($ok) {
print "ok $curr_test\n";
} else {
print "not ok $curr_test\n";
printf "# Failed test at line %d\n", (caller)[2];
for (split m/^/m, $diag) {
print "# $_";
}
print "\n" unless
$diag eq ''
or substr($diag, -1) eq "\n";
}
next_test();
return $ok;
}
# We need an external program to call.
my $ECHO = ($Is_MSWin32 ? ".\\echo$$" : $Is_MacOS ? ":echo$$" : ($Is_NetWare ? "echo$$" : "./echo$$"));
END { unlink $ECHO }
open PROG, "> $ECHO" or die "Can't create $ECHO: $!";
print PROG 'print "@ARGV\n"', "\n";
close PROG;
my $echo = "$Invoke_Perl $ECHO";
my $TEST = catfile(curdir(), 'TEST');
# First, let's make sure that Perl is checking the dangerous
# environment variables. Maybe they aren't set yet, so we'll
# taint them ourselves.
{
$ENV{'DCL$PATH'} = '' if $Is_VMS;
$ENV{PATH} = '';
delete @ENV{@MoreEnv};
$ENV{TERM} = 'dumb';
if ($Is_Cygwin && ! -f 'cygwin1.dll') {
system("/usr/bin/cp /usr/bin/cygwin1.dll .") &&
die "$0: failed to cp cygwin1.dll: $!\n";
eval q{
END { unlink "cygwin1.dll" }
};
}
if ($Is_Cygwin && ! -f 'cygcrypt-0.dll' && -f '/usr/bin/cygcrypt-0.dll') {
system("/usr/bin/cp /usr/bin/cygcrypt-0.dll .") &&
die "$0: failed to cp cygcrypt-0.dll: $!\n";
eval q{
END { unlink "cygcrypt-0.dll" }
};
}
test eval { `$echo 1` } eq "1\n";
SKIP: {
skip "Environment tainting tests skipped", 4
if $Is_MSWin32 || $Is_NetWare || $Is_VMS || $Is_Dos || $Is_MacOS;
my @vars = ('PATH', @MoreEnv);
while (my $v = $vars[0]) {
local $ENV{$v} = $TAINT;
last if eval { `$echo 1` };
last unless $@ =~ /^Insecure \$ENV{$v}/;
shift @vars;
}
test !@vars, "@vars";
# tainted $TERM is unsafe only if it contains metachars
local $ENV{TERM};
$ENV{TERM} = 'e=mc2';
test eval { `$echo 1` } eq "1\n";
$ENV{TERM} = 'e=mc2' . $TAINT;
test !eval { `$echo 1` };
test $@ =~ /^Insecure \$ENV{TERM}/, $@;
}
my $tmp;
if ($^O eq 'os2' || $^O eq 'amigaos' || $Is_MSWin32 || $Is_NetWare || $Is_Dos) {
print "# all directories are writeable\n";
}
else {
$tmp = (grep { defined and -d and (stat _)[2] & 2 }
qw(sys$scratch /tmp /var/tmp /usr/tmp),
@ENV{qw(TMP TEMP)})[0]
or print "# can't find world-writeable directory to test PATH\n";
}
SKIP: {
skip "all directories are writeable", 2 unless $tmp;
local $ENV{PATH} = $tmp;
test !eval { `$echo 1` };
test $@ =~ /^Insecure directory in \$ENV{PATH}/, $@;
}
SKIP: {
skip "This is not VMS", 4 unless $Is_VMS;
$ENV{'DCL$PATH'} = $TAINT;
test eval { `$echo 1` } eq '';
test $@ =~ /^Insecure \$ENV{DCL\$PATH}/, $@;
SKIP: {
skip q[can't find world-writeable directory to test DCL$PATH], 2
unless $tmp;
$ENV{'DCL$PATH'} = $tmp;
test eval { `$echo 1` } eq '';
test $@ =~ /^Insecure directory in \$ENV{DCL\$PATH}/, $@;
}
$ENV{'DCL$PATH'} = '';
}
}
# Let's see that we can taint and untaint as needed.
{
my $foo = $TAINT;
test tainted $foo;
# That was a sanity check. If it failed, stop the insanity!
die "Taint checks don't seem to be enabled" unless tainted $foo;
$foo = "foo";
test not tainted $foo;
taint_these($foo);
test tainted $foo;
my @list = 1..10;
test not any_tainted @list;
taint_these @list[1,3,5,7,9];
test any_tainted @list;
test all_tainted @list[1,3,5,7,9];
test not any_tainted @list[0,2,4,6,8];
($foo) = $foo =~ /(.+)/;
test not tainted $foo;
$foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
test not tainted $foo;
test $foo eq 'bar';
{
use re 'taint';
($foo) = ('bar' . $TAINT) =~ /(.+)/;
test tainted $foo;
test $foo eq 'bar';
$foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
test tainted $foo;
test $foo eq 'bar';
}
$foo = $1 if 'bar' =~ /(.+)$TAINT/;
test tainted $foo;
test $foo eq 'bar';
my $pi = 4 * atan2(1,1) + $TAINT0;
test tainted $pi;
($pi) = $pi =~ /(\d+\.\d+)/;
test not tainted $pi;
test sprintf("%.5f", $pi) eq '3.14159';
}
# How about command-line arguments? The problem is that we don't
# always get some, so we'll run another process with some.
SKIP: {
my $arg = catfile(curdir(), "arg$$");
open PROG, "> $arg" or die "Can't create $arg: $!";
print PROG q{
eval { join('', @ARGV), kill 0 };
exit 0 if $@ =~ /^Insecure dependency/;
print "# Oops: \$@ was [$@]\n";
exit 1;
};
close PROG;
print `$Invoke_Perl "-T" $arg and some suspect arguments`;
test !$?, "Exited with status $?";
unlink $arg;
}
# Reading from a file should be tainted
{
test open(FILE, $TEST), "Couldn't open '$TEST': $!";
my $block;
sysread(FILE, $block, 100);
my $line = <FILE>;
close FILE;
test tainted $block;
test tainted $line;
}
# Globs should be forbidden, except under VMS,
# which doesn't spawn an external program.
SKIP: {
skip "globs should be forbidden", 2 if 1 or $Is_VMS;
my @globs = eval { <*> };
test @globs == 0 && $@ =~ /^Insecure dependency/;
@globs = eval { glob '*' };
test @globs == 0 && $@ =~ /^Insecure dependency/;
}
# Output of commands should be tainted
{
my $foo = `$echo abc`;
test tainted $foo;
}
# Certain system variables should be tainted
{
test all_tainted $^X, $0;
}
# Results of matching should all be untainted
{
my $foo = "abcdefghi" . $TAINT;
test tainted $foo;
$foo =~ /def/;
test not any_tainted $`, $&, $';
$foo =~ /(...)(...)(...)/;
test not any_tainted $1, $2, $3, $+;
my @bar = $foo =~ /(...)(...)(...)/;
test not any_tainted @bar;
test tainted $foo; # $foo should still be tainted!
test $foo eq "abcdefghi";
}
# Operations which affect files can't use tainted data.
{
test !eval { chmod 0, $TAINT }, 'chmod';
test $@ =~ /^Insecure dependency/, $@;
# There is no feature test in $Config{} for truncate,
# so we allow for the possibility that it's missing.
test !eval { truncate 'NoSuChFiLe', $TAINT0 }, 'truncate';
test $@ =~ /^(?:Insecure dependency|truncate not implemented)/, $@;
test !eval { rename '', $TAINT }, 'rename';
test $@ =~ /^Insecure dependency/, $@;
test !eval { unlink $TAINT }, 'unlink';
test $@ =~ /^Insecure dependency/, $@;
test !eval { utime $TAINT }, 'utime';
test $@ =~ /^Insecure dependency/, $@;
SKIP: {
skip "chown() is not available", 2 unless $Config{d_chown};
test !eval { chown -1, -1, $TAINT }, 'chown';
test $@ =~ /^Insecure dependency/, $@;
}
SKIP: {
skip "link() is not available", 2 unless $Config{d_link};
test !eval { link $TAINT, '' }, 'link';
test $@ =~ /^Insecure dependency/, $@;
}
SKIP: {
skip "symlink() is not available", 2 unless $Config{d_symlink};
test !eval { symlink $TAINT, '' }, 'symlink';
test $@ =~ /^Insecure dependency/, $@;
}
}
# Operations which affect directories can't use tainted data.
{
test !eval { mkdir "foo".$TAINT, 0755.$TAINT0 }, 'mkdir';
test $@ =~ /^Insecure dependency/, $@;
test !eval { rmdir $TAINT }, 'rmdir';
test $@ =~ /^Insecure dependency/, $@;
test !eval { chdir "foo".$TAINT }, 'chdir';
test $@ =~ /^Insecure dependency/, $@;
SKIP: {
skip "chroot() is not available", 2 unless $Config{d_chroot};
test !eval { chroot $TAINT }, 'chroot';
test $@ =~ /^Insecure dependency/, $@;
}
}
# Some operations using files can't use tainted data.
{
my $foo = "imaginary library" . $TAINT;
test !eval { require $foo }, 'require';
test $@ =~ /^Insecure dependency/, $@;
my $filename = "./taintB$$"; # NB: $filename isn't tainted!
END { unlink $filename if defined $filename }
$foo = $filename . $TAINT;
unlink $filename; # in any case
test !eval { open FOO, $foo }, 'open for read';
test $@ eq '', $@; # NB: This should be allowed
# Try first new style but allow also old style.
# We do not want the whole taint.t to fail
# just because Errno possibly failing.
test eval('$!{ENOENT}') ||
$! == 2 || # File not found
($Is_Dos && $! == 22) ||
($^O eq 'mint' && $! == 33);
test !eval { open FOO, "> $foo" }, 'open for write';
test $@ =~ /^Insecure dependency/, $@;
}
# Commands to the system can't use tainted data
{
my $foo = $TAINT;
SKIP: {
skip "open('|') is not available", 4 if $^O eq 'amigaos';
test !eval { open FOO, "| x$foo" }, 'popen to';
test $@ =~ /^Insecure dependency/, $@;
test !eval { open FOO, "x$foo |" }, 'popen from';
test $@ =~ /^Insecure dependency/, $@;
}
test !eval { exec $TAINT }, 'exec';
test $@ =~ /^Insecure dependency/, $@;
test !eval { system $TAINT }, 'system';
test $@ =~ /^Insecure dependency/, $@;
$foo = "*";
taint_these $foo;
test !eval { `$echo 1$foo` }, 'backticks';
test $@ =~ /^Insecure dependency/, $@;
SKIP: {
# wildcard expansion doesn't invoke shell on VMS, so is safe
skip "This is not VMS", 2 unless $Is_VMS;
test join('', eval { glob $foo } ) ne '', 'globbing';
test $@ eq '', $@;
}
}
# Operations which affect processes can't use tainted data.
{
test !eval { kill 0, $TAINT }, 'kill';
test $@ =~ /^Insecure dependency/, $@;
SKIP: {
skip "setpgrp() is not available", 2 unless $Config{d_setpgrp};
test !eval { setpgrp 0, $TAINT0 }, 'setpgrp';
test $@ =~ /^Insecure dependency/, $@;
}
SKIP: {
skip "setpriority() is not available", 2 unless $Config{d_setprior};
test !eval { setpriority 0, $TAINT0, $TAINT0 }, 'setpriority';
test $@ =~ /^Insecure dependency/, $@;
}
}
# Some miscellaneous operations can't use tainted data.
{
SKIP: {
skip "syscall() is not available", 2 unless $Config{d_syscall};
test !eval { syscall $TAINT }, 'syscall';
test $@ =~ /^Insecure dependency/, $@;
}
{
my $foo = "x" x 979;
taint_these $foo;
local *FOO;
my $temp = "./taintC$$";
END { unlink $temp }
test open(FOO, "> $temp"), "Couldn't open $temp for write: $!";
test !eval { ioctl FOO, $TAINT0, $foo }, 'ioctl';
test $@ =~ /^Insecure dependency/, $@;
SKIP: {
skip "fcntl() is not available", 2 unless $Config{d_fcntl};
test !eval { fcntl FOO, $TAINT0, $foo }, 'fcntl';
test $@ =~ /^Insecure dependency/, $@;
}
close FOO;
}
}
# Some tests involving references
{
my $foo = 'abc' . $TAINT;
my $fooref = \$foo;
test not tainted $fooref;
test tainted $$fooref;
test tainted $foo;
}
# Some tests involving assignment
{
my $foo = $TAINT0;
my $bar = $foo;
test all_tainted $foo, $bar;
test tainted($foo = $bar);
test tainted($bar = $bar);
test tainted($bar += $bar);
test tainted($bar -= $bar);
test tainted($bar *= $bar);
test tainted($bar++);
test tainted($bar /= $bar);
test tainted($bar += 0);
test tainted($bar -= 2);
test tainted($bar *= -1);
test tainted($bar /= 1);
test tainted($bar--);
test $bar == 0;
}
# Test assignment and return of lists
{
my @foo = ("A", "tainted" . $TAINT, "B");
test not tainted $foo[0];
test tainted $foo[1];
test not tainted $foo[2];
my @bar = @foo;
test not tainted $bar[0];
test tainted $bar[1];
test not tainted $bar[2];
my @baz = eval { "A", "tainted" . $TAINT, "B" };
test not tainted $baz[0];
test tainted $baz[1];
test not tainted $baz[2];
my @plugh = eval q[ "A", "tainted" . $TAINT, "B" ];
test not tainted $plugh[0];
test tainted $plugh[1];
test not tainted $plugh[2];
my $nautilus = sub { "A", "tainted" . $TAINT, "B" };
test not tainted ((&$nautilus)[0]);
test tainted ((&$nautilus)[1]);
test not tainted ((&$nautilus)[2]);
my @xyzzy = &$nautilus;
test not tainted $xyzzy[0];
test tainted $xyzzy[1];
test not tainted $xyzzy[2];
my $red_october = sub { return "A", "tainted" . $TAINT, "B" };
test not tainted ((&$red_october)[0]);
test tainted ((&$red_october)[1]);
test not tainted ((&$red_october)[2]);
my @corge = &$red_october;
test not tainted $corge[0];
test tainted $corge[1];
test not tainted $corge[2];
}
# Test for system/library calls returning string data of dubious origin.
{
# No reliable %Config check for getpw*
SKIP: {
skip "getpwent() is not available", 1 unless
eval { setpwent(); getpwent() };
setpwent();
my @getpwent = getpwent();
die "getpwent: $!\n" unless (@getpwent);
test ( not tainted $getpwent[0]
and tainted $getpwent[1]
and not tainted $getpwent[2]
and not tainted $getpwent[3]
and not tainted $getpwent[4]
and not tainted $getpwent[5]
and tainted $getpwent[6] # ge?cos
and not tainted $getpwent[7]
and tainted $getpwent[8]); # shell
endpwent();
}
SKIP: {
# pretty hard to imagine not
skip "readdir() is not available", 1 unless $Config{d_readdir};
local(*D);
opendir(D, "op") or die "opendir: $!\n";
my $readdir = readdir(D);
test tainted $readdir;
closedir(D);
}
SKIP: {
skip "readlink() or symlink() is not available" unless
$Config{d_readlink} && $Config{d_symlink};
my $symlink = "sl$$";
unlink($symlink);
my $sl = "/something/naughty";
# it has to be a real path on Mac OS
$sl = MacPerl::MakePath((MacPerl::Volumes())[0]) if $Is_MacOS;
symlink($sl, $symlink) or die "symlink: $!\n";
my $readlink = readlink($symlink);
test tainted $readlink;
unlink($symlink);
}
}
# test bitwise ops (regression bug)
{
my $why = "y";
my $j = "x" | $why;
test not tainted $j;
$why = $TAINT."y";
$j = "x" | $why;
test tainted $j;
}
# test target of substitution (regression bug)
{
my $why = $TAINT."y";
$why =~ s/y/z/;
test tainted $why;
my $z = "[z]";
$why =~ s/$z/zee/;
test tainted $why;
$why =~ s/e/'-'.$$/ge;
test tainted $why;
}
SKIP: {
skip "no IPC::SysV", 2 unless $ipcsysv;
# test shmread
SKIP: {
skip "shm*() not available", 1 unless $Config{d_shm};
no strict 'subs';
my $sent = "foobar";
my $rcvd;
my $size = 2000;
my $id = shmget(IPC_PRIVATE, $size, S_IRWXU);
if (defined $id) {
if (shmwrite($id, $sent, 0, 60)) {
if (shmread($id, $rcvd, 0, 60)) {
substr($rcvd, index($rcvd, "\0")) = '';
} else {
warn "# shmread failed: $!\n";
}
} else {
warn "# shmwrite failed: $!\n";
}
shmctl($id, IPC_RMID, 0) or warn "# shmctl failed: $!\n";
} else {
warn "# shmget failed: $!\n";
}
skip "SysV shared memory operation failed", 1 unless
$rcvd eq $sent;
test tainted $rcvd;
}
# test msgrcv
SKIP: {
skip "msg*() not available", 1 unless $Config{d_msg};
no strict 'subs';
my $id = msgget(IPC_PRIVATE, IPC_CREAT | S_IRWXU);
my $sent = "message";
my $type_sent = 1234;
my $rcvd;
my $type_rcvd;
if (defined $id) {
if (msgsnd($id, pack("l! a*", $type_sent, $sent), IPC_NOWAIT)) {
if (msgrcv($id, $rcvd, 60, 0, IPC_NOWAIT)) {
($type_rcvd, $rcvd) = unpack("l! a*", $rcvd);
} else {
warn "# msgrcv failed: $!\n";
}
} else {
warn "# msgsnd failed: $!\n";
}
msgctl($id, IPC_RMID, 0) or warn "# msgctl failed: $!\n";
} else {
warn "# msgget failed\n";
}
SKIP: {
skip "SysV message queue operation failed", 1
unless $rcvd eq $sent && $type_sent == $type_rcvd;
test tainted $rcvd;
}
}
}
{
# bug id 20001004.006
open IN, $TEST or warn "$0: cannot read $TEST: $!" ;
local $/;
my $a = <IN>;
my $b = <IN>;
ok tainted($a) && tainted($b) && !defined($b);
close IN;
}
{
# bug id 20001004.007
open IN, $TEST or warn "$0: cannot read $TEST: $!" ;
my $a = <IN>;
my $c = { a => 42,
b => $a };
ok !tainted($c->{a}) && tainted($c->{b});
my $d = { a => $a,
b => 42 };
ok tainted($d->{a}) && !tainted($d->{b});
my $e = { a => 42,
b => { c => $a, d => 42 } };
ok !tainted($e->{a}) &&
!tainted($e->{b}) &&
tainted($e->{b}->{c}) &&
!tainted($e->{b}->{d});
close IN;
}
{
# bug id 20010519.003
BEGIN {
use vars qw($has_fcntl);
eval { require Fcntl; import Fcntl; };
unless ($@) {
$has_fcntl = 1;
}
}
SKIP: {
skip "no Fcntl", 18 unless $has_fcntl;
my $evil = "foo" . $TAINT;
eval { sysopen(my $ro, $evil, &O_RDONLY) };
test $@ !~ /^Insecure dependency/, $@;
eval { sysopen(my $wo, $evil, &O_WRONLY) };
test $@ =~ /^Insecure dependency/, $@;
eval { sysopen(my $rw, $evil, &O_RDWR) };
test $@ =~ /^Insecure dependency/, $@;
eval { sysopen(my $ap, $evil, &O_APPEND) };
test $@ =~ /^Insecure dependency/, $@;
eval { sysopen(my $cr, $evil, &O_CREAT) };
test $@ =~ /^Insecure dependency/, $@;
eval { sysopen(my $tr, $evil, &O_TRUNC) };
test $@ =~ /^Insecure dependency/, $@;
eval { sysopen(my $ro, "foo", &O_RDONLY | $TAINT0) };
test $@ !~ /^Insecure dependency/, $@;
eval { sysopen(my $wo, "foo", &O_WRONLY | $TAINT0) };
test $@ =~ /^Insecure dependency/, $@;
eval { sysopen(my $rw, "foo", &O_RDWR | $TAINT0) };
test $@ =~ /^Insecure dependency/, $@;
eval { sysopen(my $ap, "foo", &O_APPEND | $TAINT0) };
test $@ =~ /^Insecure dependency/, $@;
eval { sysopen(my $cr, "foo", &O_CREAT | $TAINT0) };
test $@ =~ /^Insecure dependency/, $@;
eval { sysopen(my $tr, "foo", &O_TRUNC | $TAINT0) };
test $@ =~ /^Insecure dependency/, $@;
eval { sysopen(my $ro, "foo", &O_RDONLY, $TAINT0) };
test $@ !~ /^Insecure dependency/, $@;
eval { sysopen(my $wo, "foo", &O_WRONLY, $TAINT0) };
test $@ =~ /^Insecure dependency/, $@;
eval { sysopen(my $rw, "foo", &O_RDWR, $TAINT0) };
test $@ =~ /^Insecure dependency/, $@;
eval { sysopen(my $ap, "foo", &O_APPEND, $TAINT0) };
test $@ =~ /^Insecure dependency/, $@;
eval { sysopen(my $cr, "foo", &O_CREAT, $TAINT0) };
test $@ =~ /^Insecure dependency/, $@;
eval { sysopen(my $tr, "foo", &O_TRUNC, $TAINT0) };
test $@ =~ /^Insecure dependency/, $@;
unlink("foo"); # not unlink($evil), because that would fail...
}
}
{
# bug 20010526.004
use warnings;
my $saw_warning = 0;
local $SIG{__WARN__} = sub { $saw_warning = 1 };
sub fmi {
my $divnum = shift()/1;
sprintf("%1.1f\n", $divnum);
}
fmi(21 . $TAINT);
fmi(37);
fmi(248);
test !$saw_warning;
}
{
# Bug ID 20010730.010
my $i = 0;
sub Tie::TIESCALAR {
my $class = shift;
my $arg = shift;
bless \$arg => $class;
}
sub Tie::FETCH {
$i ++;
${$_ [0]}
}
package main;
my $bar = "The Big Bright Green Pleasure Machine";
taint_these $bar;
tie my ($foo), Tie => $bar;
my $baz = $foo;
ok $i == 1;
}
{
# Check that all environment variables are tainted.
my @untainted;
while (my ($k, $v) = each %ENV) {
if (!tainted($v) &&
# These we have explicitly untainted or set earlier.
$k !~ /^(BASH_ENV|CDPATH|ENV|IFS|PATH|PERL_CORE|TEMP|TERM|TMP)$/) {
push @untainted, "# '$k' = '$v'\n";
}
}
test @untainted == 0, "untainted:\n @untainted";
}
ok( ${^TAINT} == 1, '$^TAINT is on' );
eval { ${^TAINT} = 0 };
ok( ${^TAINT}, '$^TAINT is not assignable' );
ok( $@ =~ /^Modification of a read-only value attempted/,
'Assigning to ${^TAINT} fails' );
{
# bug 20011111.105
my $re1 = qr/x$TAINT/;
test tainted $re1;
my $re2 = qr/^$re1\z/;
test tainted $re2;
my $re3 = "$re2";
test tainted $re3;
}
SKIP: {
skip "system {} has different semantics on Win32", 1 if $Is_MSWin32;
# bug 20010221.005
local $ENV{PATH} .= $TAINT;
eval { system { "echo" } "/arg0", "arg1" };
test $@ =~ /^Insecure \$ENV/;
}
TODO: {
todo_skip 'tainted %ENV warning occludes tainted arguments warning', 22
if $Is_VMS;
# bug 20020208.005 plus some single arg exec/system extras
my $err = qr/^Insecure dependency/ ;
test !eval { exec $TAINT, $TAINT }, 'exec';
test $@ =~ $err, $@;
test !eval { exec $TAINT $TAINT }, 'exec';
test $@ =~ $err, $@;
test !eval { exec $TAINT $TAINT, $TAINT }, 'exec';
test $@ =~ $err, $@;
test !eval { exec $TAINT 'notaint' }, 'exec';
test $@ =~ $err, $@;
test !eval { exec {'notaint'} $TAINT }, 'exec';
test $@ =~ $err, $@;
test !eval { system $TAINT, $TAINT }, 'system';
test $@ =~ $err, $@;
test !eval { system $TAINT $TAINT }, 'system';
test $@ =~ $err, $@;
test !eval { system $TAINT $TAINT, $TAINT }, 'system';
test $@ =~ $err, $@;
test !eval { system $TAINT 'notaint' }, 'system';
test $@ =~ $err, $@;
test !eval { system {'notaint'} $TAINT }, 'system';
test $@ =~ $err, $@;
eval {
no warnings;
system("lskdfj does not exist","with","args");
};
test !$@;
SKIP: {
skip "no exec() on MacOS Classic" if $Is_MacOS;
eval {
no warnings;
exec("lskdfj does not exist","with","args");
};
test !$@;
}
# If you add tests here update also the above skip block for VMS.
}
{
# [ID 20020704.001] taint propagation failure
use re 'taint';
$TAINT =~ /(.*)/;
test tainted(my $foo = $1);
}
{
# [perl #24291] this used to dump core
our %nonmagicalenv = ( PATH => "util" );
local *ENV = \%nonmagicalenv;
eval { system("lskdfj"); };
test $@ =~ /^%ENV is aliased to another variable while running with -T switch/;
local *ENV = *nonmagicalenv;
eval { system("lskdfj"); };
test $@ =~ /^%ENV is aliased to %nonmagicalenv while running with -T switch/;
}
{
# [perl #24248]
$TAINT =~ /(.*)/;
test !tainted($1);
my $notaint = $1;
test !tainted($notaint);
my $l;
$notaint =~ /($notaint)/;
$l = $1;
test !tainted($1);
test !tainted($l);
$notaint =~ /($TAINT)/;
$l = $1;
test tainted($1);
test tainted($l);
$TAINT =~ /($notaint)/;
$l = $1;
test !tainted($1);
test !tainted($l);
$TAINT =~ /($TAINT)/;
$l = $1;
test tainted($1);
test tainted($l);
my $r;
($r = $TAINT) =~ /($notaint)/;
test !tainted($1);
($r = $TAINT) =~ /($TAINT)/;
test tainted($1);
# [perl #24674]
# accessing $^O shoudn't taint it as a side-effect;
# assigning tainted data to it is now an error
test !tainted($^O);
if (!$^X) { } elsif ($^O eq 'bar') { }
test !tainted($^O);
eval '$^O = $^X';
test $@ =~ /Insecure dependency in/;
}
EFFECTIVELY_CONSTANTS: {
my $tainted_number = 12 + $TAINT0;
test tainted( $tainted_number );
# Even though it's always 0, it's still tainted
my $tainted_product = $tainted_number * 0;
test tainted( $tainted_product );
test $tainted_product == 0;
}
TERNARY_CONDITIONALS: {
my $tainted_true = $TAINT . "blah blah blah";
my $tainted_false = $TAINT0;
test tainted( $tainted_true );
test tainted( $tainted_false );
my $result = $tainted_true ? "True" : "False";
test $result eq "True";
test !tainted( $result );
$result = $tainted_false ? "True" : "False";
test $result eq "False";
test !tainted( $result );
my $untainted_whatever = "The Fabulous Johnny Cash";
my $tainted_whatever = "Soft Cell" . $TAINT;
$result = $tainted_true ? $tainted_whatever : $untainted_whatever;
test $result eq "Soft Cell";
test tainted( $result );
$result = $tainted_false ? $tainted_whatever : $untainted_whatever;
test $result eq "The Fabulous Johnny Cash";
test !tainted( $result );
}
{
# rt.perl.org 5900 $1 remains tainted if...
# 1) The regular expression contains a scalar variable AND
# 2) The regular expression appears in an elsif clause
my $foo = "abcdefghi" . $TAINT;
my $valid_chars = 'a-z';
if ( $foo eq '' ) {
}
elsif ( $foo =~ /([$valid_chars]+)/o ) {
test not tainted $1;
}
if ( $foo eq '' ) {
}
elsif ( my @bar = $foo =~ /([$valid_chars]+)/o ) {
test not any_tainted @bar;
}
}
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