683 lines
18 KiB
Perl
Executable File
683 lines
18 KiB
Perl
Executable File
#!./perl -T
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#
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# Taint tests by Tom Phoenix <rootbeer@teleport.com>.
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#
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# I don't claim to know all about tainting. If anyone sees
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# tests that I've missed here, please add them. But this is
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# better than having no tests at all, right?
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#
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BEGIN {
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chdir 't' if -d 't';
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unshift @INC, '../lib' if -d '../lib';
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}
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use strict;
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use Config;
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# We do not want the whole taint.t to fail
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# just because Errno possibly failing.
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eval { require Errno; import Errno };
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BEGIN {
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if ($^O eq 'VMS' && !defined($Config{d_setenv})) {
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$ENV{PATH} = $ENV{PATH};
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$ENV{TERM} = $ENV{TERM} ne ''? $ENV{TERM} : 'dummy';
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}
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if ($Config{d_shm} || $Config{d_msg}) {
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require IPC::SysV;
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IPC::SysV->import(qw(IPC_PRIVATE IPC_RMID IPC_CREAT S_IRWXU));
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}
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}
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my $Is_VMS = $^O eq 'VMS';
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my $Is_MSWin32 = $^O eq 'MSWin32';
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my $Is_Dos = $^O eq 'dos';
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my $Invoke_Perl = $Is_VMS ? 'MCR Sys$Disk:[]Perl.' :
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$Is_MSWin32 ? '.\perl' : './perl';
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my @MoreEnv = qw/IFS CDPATH ENV BASH_ENV/;
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if ($Is_VMS) {
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my (%old, $x);
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for $x ('DCL$PATH', @MoreEnv) {
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($old{$x}) = $ENV{$x} =~ /^(.*)$/ if exists $ENV{$x};
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}
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eval <<EndOfCleanup;
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END {
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\$ENV{PATH} = '' if $Config{d_setenv};
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warn "# Note: logical name 'PATH' may have been deleted\n";
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\@ENV{keys %old} = values %old;
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}
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EndOfCleanup
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}
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# Sources of taint:
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# The empty tainted value, for tainting strings
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my $TAINT = substr($^X, 0, 0);
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# A tainted zero, useful for tainting numbers
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my $TAINT0 = 0 + $TAINT;
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# This taints each argument passed. All must be lvalues.
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# Side effect: It also stringifies them. :-(
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sub taint_these (@) {
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for (@_) { $_ .= $TAINT }
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}
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# How to identify taint when you see it
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sub any_tainted (@) {
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not eval { join("",@_), kill 0; 1 };
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}
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sub tainted ($) {
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any_tainted @_;
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}
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sub all_tainted (@) {
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for (@_) { return 0 unless tainted $_ }
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1;
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}
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sub test ($$;$) {
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my($serial, $boolean, $diag) = @_;
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if ($boolean) {
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print "ok $serial\n";
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} else {
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print "not ok $serial\n";
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for (split m/^/m, $diag) {
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print "# $_";
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}
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print "\n" unless
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$diag eq ''
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or substr($diag, -1) eq "\n";
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}
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}
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# We need an external program to call.
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my $ECHO = ($Is_MSWin32 ? ".\\echo$$" : "./echo$$");
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END { unlink $ECHO }
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open PROG, "> $ECHO" or die "Can't create $ECHO: $!";
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print PROG 'print "@ARGV\n"', "\n";
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close PROG;
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my $echo = "$Invoke_Perl $ECHO";
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print "1..151\n";
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# First, let's make sure that Perl is checking the dangerous
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# environment variables. Maybe they aren't set yet, so we'll
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# taint them ourselves.
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{
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$ENV{'DCL$PATH'} = '' if $Is_VMS;
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$ENV{PATH} = '';
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delete @ENV{@MoreEnv};
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$ENV{TERM} = 'dumb';
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test 1, eval { `$echo 1` } eq "1\n";
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if ($Is_MSWin32 || $Is_VMS || $Is_Dos) {
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print "# Environment tainting tests skipped\n";
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for (2..5) { print "ok $_\n" }
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}
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else {
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my @vars = ('PATH', @MoreEnv);
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while (my $v = $vars[0]) {
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local $ENV{$v} = $TAINT;
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last if eval { `$echo 1` };
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last unless $@ =~ /^Insecure \$ENV{$v}/;
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shift @vars;
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}
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test 2, !@vars, "\$$vars[0]";
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# tainted $TERM is unsafe only if it contains metachars
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local $ENV{TERM};
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$ENV{TERM} = 'e=mc2';
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test 3, eval { `$echo 1` } eq "1\n";
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$ENV{TERM} = 'e=mc2' . $TAINT;
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test 4, eval { `$echo 1` } eq '';
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test 5, $@ =~ /^Insecure \$ENV{TERM}/, $@;
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}
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my $tmp;
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if ($^O eq 'os2' || $^O eq 'amigaos' || $Is_MSWin32 || $Is_Dos) {
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print "# all directories are writeable\n";
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}
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else {
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$tmp = (grep { defined and -d and (stat _)[2] & 2 }
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qw(sys$scratch /tmp /var/tmp /usr/tmp),
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@ENV{qw(TMP TEMP)})[0]
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or print "# can't find world-writeable directory to test PATH\n";
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}
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if ($tmp) {
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local $ENV{PATH} = $tmp;
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test 6, eval { `$echo 1` } eq '';
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test 7, $@ =~ /^Insecure directory in \$ENV{PATH}/, $@;
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}
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else {
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for (6..7) { print "ok $_ # Skipped: all directories are writeable\n" }
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}
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if ($Is_VMS) {
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$ENV{'DCL$PATH'} = $TAINT;
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test 8, eval { `$echo 1` } eq '';
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test 9, $@ =~ /^Insecure \$ENV{DCL\$PATH}/, $@;
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if ($tmp) {
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$ENV{'DCL$PATH'} = $tmp;
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test 10, eval { `$echo 1` } eq '';
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test 11, $@ =~ /^Insecure directory in \$ENV{DCL\$PATH}/, $@;
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}
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else {
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for (10..11) { print "ok $_ # Skipped: can't find world-writeable directory to test DCL\$PATH\n" }
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}
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$ENV{'DCL$PATH'} = '';
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}
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else {
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for (8..11) { print "ok $_ # Skipped: This is not VMS\n"; }
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}
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}
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# Let's see that we can taint and untaint as needed.
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{
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my $foo = $TAINT;
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test 12, tainted $foo;
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# That was a sanity check. If it failed, stop the insanity!
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die "Taint checks don't seem to be enabled" unless tainted $foo;
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$foo = "foo";
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test 13, not tainted $foo;
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taint_these($foo);
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test 14, tainted $foo;
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my @list = 1..10;
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test 15, not any_tainted @list;
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taint_these @list[1,3,5,7,9];
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test 16, any_tainted @list;
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test 17, all_tainted @list[1,3,5,7,9];
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test 18, not any_tainted @list[0,2,4,6,8];
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($foo) = $foo =~ /(.+)/;
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test 19, not tainted $foo;
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$foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
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test 20, not tainted $foo;
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test 21, $foo eq 'bar';
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{
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use re 'taint';
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($foo) = ('bar' . $TAINT) =~ /(.+)/;
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test 22, tainted $foo;
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test 23, $foo eq 'bar';
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$foo = $1 if ('bar' . $TAINT) =~ /(.+)/;
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test 24, tainted $foo;
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test 25, $foo eq 'bar';
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}
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$foo = $1 if 'bar' =~ /(.+)$TAINT/;
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test 26, tainted $foo;
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test 27, $foo eq 'bar';
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my $pi = 4 * atan2(1,1) + $TAINT0;
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test 28, tainted $pi;
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($pi) = $pi =~ /(\d+\.\d+)/;
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test 29, not tainted $pi;
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test 30, sprintf("%.5f", $pi) eq '3.14159';
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}
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# How about command-line arguments? The problem is that we don't
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# always get some, so we'll run another process with some.
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{
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my $arg = "./arg$$";
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open PROG, "> $arg" or die "Can't create $arg: $!";
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print PROG q{
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eval { join('', @ARGV), kill 0 };
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exit 0 if $@ =~ /^Insecure dependency/;
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print "# Oops: \$@ was [$@]\n";
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exit 1;
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};
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close PROG;
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print `$Invoke_Perl "-T" $arg and some suspect arguments`;
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test 31, !$?, "Exited with status $?";
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unlink $arg;
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}
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# Reading from a file should be tainted
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{
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my $file = './TEST';
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test 32, open(FILE, $file), "Couldn't open '$file': $!";
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my $block;
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sysread(FILE, $block, 100);
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my $line = <FILE>;
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close FILE;
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test 33, tainted $block;
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test 34, tainted $line;
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}
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# Globs should be forbidden, except under VMS,
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# which doesn't spawn an external program.
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if (1 # built-in glob
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or $Is_VMS) {
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for (35..36) { print "ok $_\n"; }
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}
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else {
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my @globs = eval { <*> };
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test 35, @globs == 0 && $@ =~ /^Insecure dependency/;
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@globs = eval { glob '*' };
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test 36, @globs == 0 && $@ =~ /^Insecure dependency/;
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}
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# Output of commands should be tainted
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{
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my $foo = `$echo abc`;
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test 37, tainted $foo;
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}
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# Certain system variables should be tainted
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{
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test 38, all_tainted $^X, $0;
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}
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# Results of matching should all be untainted
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{
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my $foo = "abcdefghi" . $TAINT;
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test 39, tainted $foo;
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$foo =~ /def/;
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test 40, not any_tainted $`, $&, $';
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$foo =~ /(...)(...)(...)/;
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test 41, not any_tainted $1, $2, $3, $+;
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my @bar = $foo =~ /(...)(...)(...)/;
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test 42, not any_tainted @bar;
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test 43, tainted $foo; # $foo should still be tainted!
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test 44, $foo eq "abcdefghi";
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}
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# Operations which affect files can't use tainted data.
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{
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test 45, eval { chmod 0, $TAINT } eq '', 'chmod';
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test 46, $@ =~ /^Insecure dependency/, $@;
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# There is no feature test in $Config{} for truncate,
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# so we allow for the possibility that it's missing.
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test 47, eval { truncate 'NoSuChFiLe', $TAINT0 } eq '', 'truncate';
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test 48, $@ =~ /^(?:Insecure dependency|truncate not implemented)/, $@;
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test 49, eval { rename '', $TAINT } eq '', 'rename';
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test 50, $@ =~ /^Insecure dependency/, $@;
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test 51, eval { unlink $TAINT } eq '', 'unlink';
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test 52, $@ =~ /^Insecure dependency/, $@;
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test 53, eval { utime $TAINT } eq '', 'utime';
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test 54, $@ =~ /^Insecure dependency/, $@;
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if ($Config{d_chown}) {
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test 55, eval { chown -1, -1, $TAINT } eq '', 'chown';
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test 56, $@ =~ /^Insecure dependency/, $@;
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}
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else {
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for (55..56) { print "ok $_ # Skipped: chown() is not available\n" }
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}
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if ($Config{d_link}) {
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test 57, eval { link $TAINT, '' } eq '', 'link';
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test 58, $@ =~ /^Insecure dependency/, $@;
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}
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else {
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for (57..58) { print "ok $_ # Skipped: link() is not available\n" }
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}
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if ($Config{d_symlink}) {
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test 59, eval { symlink $TAINT, '' } eq '', 'symlink';
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test 60, $@ =~ /^Insecure dependency/, $@;
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}
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else {
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for (59..60) { print "ok $_ # Skipped: symlink() is not available\n" }
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}
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}
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# Operations which affect directories can't use tainted data.
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{
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test 61, eval { mkdir $TAINT0, $TAINT } eq '', 'mkdir';
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test 62, $@ =~ /^Insecure dependency/, $@;
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test 63, eval { rmdir $TAINT } eq '', 'rmdir';
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test 64, $@ =~ /^Insecure dependency/, $@;
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test 65, eval { chdir $TAINT } eq '', 'chdir';
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test 66, $@ =~ /^Insecure dependency/, $@;
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if ($Config{d_chroot}) {
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test 67, eval { chroot $TAINT } eq '', 'chroot';
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test 68, $@ =~ /^Insecure dependency/, $@;
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}
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else {
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for (67..68) { print "ok $_ # Skipped: chroot() is not available\n" }
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}
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}
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# Some operations using files can't use tainted data.
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{
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my $foo = "imaginary library" . $TAINT;
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test 69, eval { require $foo } eq '', 'require';
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test 70, $@ =~ /^Insecure dependency/, $@;
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my $filename = "./taintB$$"; # NB: $filename isn't tainted!
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END { unlink $filename if defined $filename }
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$foo = $filename . $TAINT;
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unlink $filename; # in any case
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test 71, eval { open FOO, $foo } eq '', 'open for read';
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test 72, $@ eq '', $@; # NB: This should be allowed
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# Try first new style but allow also old style.
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test 73, $!{ENOENT} ||
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$! == 2 || # File not found
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($Is_Dos && $! == 22) ||
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($^O eq 'mint' && $! == 33);
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test 74, eval { open FOO, "> $foo" } eq '', 'open for write';
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test 75, $@ =~ /^Insecure dependency/, $@;
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}
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# Commands to the system can't use tainted data
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{
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my $foo = $TAINT;
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if ($^O eq 'amigaos') {
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for (76..79) { print "ok $_ # Skipped: open('|') is not available\n" }
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}
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else {
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test 76, eval { open FOO, "| x$foo" } eq '', 'popen to';
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test 77, $@ =~ /^Insecure dependency/, $@;
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test 78, eval { open FOO, "x$foo |" } eq '', 'popen from';
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test 79, $@ =~ /^Insecure dependency/, $@;
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}
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test 80, eval { exec $TAINT } eq '', 'exec';
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test 81, $@ =~ /^Insecure dependency/, $@;
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test 82, eval { system $TAINT } eq '', 'system';
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test 83, $@ =~ /^Insecure dependency/, $@;
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$foo = "*";
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taint_these $foo;
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test 84, eval { `$echo 1$foo` } eq '', 'backticks';
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test 85, $@ =~ /^Insecure dependency/, $@;
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if ($Is_VMS) { # wildcard expansion doesn't invoke shell, so is safe
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test 86, join('', eval { glob $foo } ) ne '', 'globbing';
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test 87, $@ eq '', $@;
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}
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else {
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for (86..87) { print "ok $_ # Skipped: this is not VMS\n"; }
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}
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}
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# Operations which affect processes can't use tainted data.
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{
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test 88, eval { kill 0, $TAINT } eq '', 'kill';
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test 89, $@ =~ /^Insecure dependency/, $@;
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if ($Config{d_setpgrp}) {
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test 90, eval { setpgrp 0, $TAINT } eq '', 'setpgrp';
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test 91, $@ =~ /^Insecure dependency/, $@;
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}
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else {
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for (90..91) { print "ok $_ # Skipped: setpgrp() is not available\n" }
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}
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if ($Config{d_setprior}) {
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test 92, eval { setpriority 0, $TAINT, $TAINT } eq '', 'setpriority';
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test 93, $@ =~ /^Insecure dependency/, $@;
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}
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else {
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for (92..93) { print "ok $_ # Skipped: setpriority() is not available\n" }
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}
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}
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# Some miscellaneous operations can't use tainted data.
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{
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if ($Config{d_syscall}) {
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test 94, eval { syscall $TAINT } eq '', 'syscall';
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test 95, $@ =~ /^Insecure dependency/, $@;
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}
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else {
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for (94..95) { print "ok $_ # Skipped: syscall() is not available\n" }
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}
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{
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my $foo = "x" x 979;
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taint_these $foo;
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local *FOO;
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my $temp = "./taintC$$";
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END { unlink $temp }
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test 96, open(FOO, "> $temp"), "Couldn't open $temp for write: $!";
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test 97, eval { ioctl FOO, $TAINT, $foo } eq '', 'ioctl';
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test 98, $@ =~ /^Insecure dependency/, $@;
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if ($Config{d_fcntl}) {
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test 99, eval { fcntl FOO, $TAINT, $foo } eq '', 'fcntl';
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test 100, $@ =~ /^Insecure dependency/, $@;
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}
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else {
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for (99..100) { print "ok $_ # Skipped: fcntl() is not available\n" }
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}
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close FOO;
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}
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}
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# Some tests involving references
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{
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my $foo = 'abc' . $TAINT;
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my $fooref = \$foo;
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test 101, not tainted $fooref;
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test 102, tainted $$fooref;
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test 103, tainted $foo;
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}
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# Some tests involving assignment
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{
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my $foo = $TAINT0;
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my $bar = $foo;
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test 104, all_tainted $foo, $bar;
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test 105, tainted($foo = $bar);
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test 106, tainted($bar = $bar);
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test 107, tainted($bar += $bar);
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test 108, tainted($bar -= $bar);
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test 109, tainted($bar *= $bar);
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test 110, tainted($bar++);
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test 111, tainted($bar /= $bar);
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test 112, tainted($bar += 0);
|
|
test 113, tainted($bar -= 2);
|
|
test 114, tainted($bar *= -1);
|
|
test 115, tainted($bar /= 1);
|
|
test 116, tainted($bar--);
|
|
test 117, $bar == 0;
|
|
}
|
|
|
|
# Test assignment and return of lists
|
|
{
|
|
my @foo = ("A", "tainted" . $TAINT, "B");
|
|
test 118, not tainted $foo[0];
|
|
test 119, tainted $foo[1];
|
|
test 120, not tainted $foo[2];
|
|
my @bar = @foo;
|
|
test 121, not tainted $bar[0];
|
|
test 122, tainted $bar[1];
|
|
test 123, not tainted $bar[2];
|
|
my @baz = eval { "A", "tainted" . $TAINT, "B" };
|
|
test 124, not tainted $baz[0];
|
|
test 125, tainted $baz[1];
|
|
test 126, not tainted $baz[2];
|
|
my @plugh = eval q[ "A", "tainted" . $TAINT, "B" ];
|
|
test 127, not tainted $plugh[0];
|
|
test 128, tainted $plugh[1];
|
|
test 129, not tainted $plugh[2];
|
|
my $nautilus = sub { "A", "tainted" . $TAINT, "B" };
|
|
test 130, not tainted ((&$nautilus)[0]);
|
|
test 131, tainted ((&$nautilus)[1]);
|
|
test 132, not tainted ((&$nautilus)[2]);
|
|
my @xyzzy = &$nautilus;
|
|
test 133, not tainted $xyzzy[0];
|
|
test 134, tainted $xyzzy[1];
|
|
test 135, not tainted $xyzzy[2];
|
|
my $red_october = sub { return "A", "tainted" . $TAINT, "B" };
|
|
test 136, not tainted ((&$red_october)[0]);
|
|
test 137, tainted ((&$red_october)[1]);
|
|
test 138, not tainted ((&$red_october)[2]);
|
|
my @corge = &$red_october;
|
|
test 139, not tainted $corge[0];
|
|
test 140, tainted $corge[1];
|
|
test 141, not tainted $corge[2];
|
|
}
|
|
|
|
# Test for system/library calls returning string data of dubious origin.
|
|
{
|
|
# No reliable %Config check for getpw*
|
|
if (eval { setpwent(); getpwent(); 1 }) {
|
|
setpwent();
|
|
my @getpwent = getpwent();
|
|
die "getpwent: $!\n" unless (@getpwent);
|
|
test 142,( 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();
|
|
} else {
|
|
for (142) { print "ok $_ # Skipped: getpwent() is not available\n" }
|
|
}
|
|
|
|
if ($Config{d_readdir}) { # pretty hard to imagine not
|
|
local(*D);
|
|
opendir(D, "op") or die "opendir: $!\n";
|
|
my $readdir = readdir(D);
|
|
test 143, tainted $readdir;
|
|
closedir(OP);
|
|
} else {
|
|
for (143) { print "ok $_ # Skipped: readdir() is not available\n" }
|
|
}
|
|
|
|
if ($Config{d_readlink} && $Config{d_symlink}) {
|
|
my $symlink = "sl$$";
|
|
unlink($symlink);
|
|
symlink("/something/naughty", $symlink) or die "symlink: $!\n";
|
|
my $readlink = readlink($symlink);
|
|
test 144, tainted $readlink;
|
|
unlink($symlink);
|
|
} else {
|
|
for (144) { print "ok $_ # Skipped: readlink() or symlink() is not available\n"; }
|
|
}
|
|
}
|
|
|
|
# test bitwise ops (regression bug)
|
|
{
|
|
my $why = "y";
|
|
my $j = "x" | $why;
|
|
test 145, not tainted $j;
|
|
$why = $TAINT."y";
|
|
$j = "x" | $why;
|
|
test 146, tainted $j;
|
|
}
|
|
|
|
# test target of substitution (regression bug)
|
|
{
|
|
my $why = $TAINT."y";
|
|
$why =~ s/y/z/;
|
|
test 147, tainted $why;
|
|
|
|
my $z = "[z]";
|
|
$why =~ s/$z/zee/;
|
|
test 148, tainted $why;
|
|
|
|
$why =~ s/e/'-'.$$/ge;
|
|
test 149, tainted $why;
|
|
}
|
|
|
|
# test shmread
|
|
{
|
|
if ($Config{d_shm}) {
|
|
no strict 'subs';
|
|
my $sent = "foobar";
|
|
my $rcvd;
|
|
my $size = 2000;
|
|
my $id = shmget(IPC_PRIVATE, $size, S_IRWXU) ||
|
|
warn "# shmget failed: $!\n";
|
|
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) || warn "# shmctl failed: $!\n";
|
|
} else {
|
|
warn "# shmget failed: $!\n";
|
|
}
|
|
|
|
if ($rcvd eq $sent) {
|
|
test 150, tainted $rcvd;
|
|
} else {
|
|
print "ok 150 # Skipped: SysV shared memory operation failed\n";
|
|
}
|
|
} else {
|
|
print "ok 150 # Skipped: SysV shared memory is not available\n";
|
|
}
|
|
}
|
|
|
|
# test msgrcv
|
|
{
|
|
if ($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, $sent), 0)) {
|
|
if (msgrcv($id, $rcvd, 60, 0, 0)) {
|
|
($type_rcvd, $rcvd) = unpack("l! a*", $rcvd);
|
|
} else {
|
|
warn "# msgrcv failed\n";
|
|
}
|
|
} else {
|
|
warn "# msgsnd failed\n";
|
|
}
|
|
msgctl($id, IPC_RMID, 0) || warn "# msgctl failed: $!\n";
|
|
} else {
|
|
warn "# msgget failed\n";
|
|
}
|
|
|
|
if ($rcvd eq $sent && $type_sent == $type_rcvd) {
|
|
test 151, tainted $rcvd;
|
|
} else {
|
|
print "ok 151 # Skipped: SysV message queue operation failed\n";
|
|
}
|
|
} else {
|
|
print "ok 151 # Skipped: SysV message queues are not available\n";
|
|
}
|
|
}
|
|
|