Taint-Util-0.08000755001750001750 011350246153 12500 5ustar00avaravar000000000000Util.xs000644001750001750 74511350246153 14037 0ustar00avaravar000000000000Taint-Util-0.08#include "EXTERN.h" #include "perl.h" #include "XSUB.h" MODULE = Taint::Util PACKAGE = Taint::Util void tainted(SV *sv) PPCODE: EXTEND(SP, 1); if (SvTAINTED(sv)) PUSHs(&PL_sv_yes); else PUSHs(&PL_sv_no); void taint(...) PREINIT: I32 i; PPCODE: for (i = 0; i < items; ++i) if (!SvREADONLY(ST(i))) SvTAINTED_on(ST(i)); void untaint(...) PREINIT: I32 i; PPCODE: for (i = 0; i < items; ++i) SvTAINTED_off(ST(i)); Util.pm000644001750001750 1237411350246153 14062 0ustar00avaravar000000000000Taint-Util-0.08package Taint::Util; our $VERSION = '0.08'; use XSLoader (); @EXPORT_OK{qw(tainted taint untaint)} = (); sub import { shift; my $caller = caller; for (@_ ? @_ : keys %EXPORT_OK) { die qq["$_" is not exported by the @{[__PACKAGE__]} module"] unless exists $EXPORT_OK{$_}; *{"$caller\::$_"} = \&$_; } } XSLoader::load __PACKAGE__, $VERSION; 1; __END__ =head1 NAME Taint::Util - Test for and flip the taint flag without regex matches or C =head1 SYNOPSIS #!/usr/bin/env perl -T use Taint::Util; # eek! untaint $ENV{PATH}; # $sv now tainted under taint mode (-T) taint(my $sv = "hlagh"); # Untaint $sv again untaint $sv if tainted $sv; =head1 DESCRIPTION Wraps perl's internal routines for checking and setting the taint flag and thus does not rely on regular expressions for untainting or odd tricks involving C and C for checking whether data is tainted, instead it checks and flips a flag on the scalar in-place. =head1 FUNCTIONS =head2 tainted Returns a boolean indicating whether a scalar is tainted. Always false when not under taint mode. =head2 taint & untaint Taints or untaints given values, arrays will be flattened and their elements tainted, likewise with the values of hashes (keys can't be tainted, see L). Returns no value (which evaluates to false). untaint(%ENV); # Untaints the environment taint(my @hlagh = qw(a o e u)); # elements of @hlagh now tainted References (being scalars) can also be tainted, a stringified reference reference raises an error where a tainted scalar would: taint(my $ar = \@hlagh); system echo => $ar; # err: Insecure dependency in system This feature is used by perl internally to taint the blessed object C<< qr// >> stringifies to. taint(my $str = "oh noes"); my $re = qr/$str/; system echo => $re; # err: Insecure dependency in system This does not mean that tainted blessed objects with overloaded stringification via L need return a tainted object since those objects may return a non-tainted scalar when stringified (see F for an example). The internal handling of C<< qr// >> however ensures that this holds true. File handles can also be tainted, but this is pretty useless as the handle itself and not lines retrieved from it will be tainted, see the next section for details. taint(*DATA); # *DATA tainted my $ln = ; # $ln not tainted =head1 About tainting in Perl Since this module is a low level interface that directly exposes the internal C functions it also presents new and exciting ways for shooting yourself in the foot. Tainting in Perl was always meant to be used for potentially hostile external data passed to the program. Perl is passed a soup of strings from the outside; it never receives any complex datatypes directly. For instance, you might get tainted hash keys in C<%ENV> or tainted strings from C<*STDIN>, but you'll never get a tainted Hash reference or a tainted subroutine. Internally, the perl compiler sets the taint flag on external data in a select few functions mainly having to do with IO and string operations. For example, the C function will manually set a tainted flag on its newly created string depending on whether the original was tainted or not. However, since Taint::Util is exposing some of perl's guts, things get more complex. Internally, tainting is implemented via perl's MAGIC facility, which allows you to attach attach magic to any scalar, but since perl doesn't liberally taint scalars it's there to back you up if you do. You can C and C will subsequently be true but if you read from the filehandle via C<< >> you'll get untainted data back. As you might have guessed this is completely useless. The test file F highlights some of these edge cases. Back in the real world, the only reason tainting makes sense is because perl will back you up when you use it, e.g. it will slap your hand if you try to pass a tainted value to system(). If you taint references, perl doesn't offer that protection, because it doesn't know anything about tainted references since it would never create one. The things that do work like the stringification of C (i.e. C) being tainted only work incidentally. But I'm not going to stop you. By all means, have at it! Just don't expect it to do anything more useful than warming up your computer. See L for the bug that inspired this section. =head1 EXPORTS Exports C, C and C by default. Individual functions can be exported by specifying them in the C list, to export none use C<()>. =head1 HISTORY I wrote this when implementing L so that someone writing a custom regex engine with it wouldn't have to rely on perl regexps for untainting capture variables, which would be a bit odd. =head1 SEE ALSO L =head1 AUTHOR Evar ArnfjErE Bjarmason =head1 LICENSE Copyright 2007-2010 Evar ArnfjErE Bjarmason. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. =cut ChangeLog000644001750001750 402011350246153 14326 0ustar00avaravar000000000000Taint-Util-0.082010-03-17 Ævar Arnfjörð Bjarmason (0.08) * META.yml: RT#55666: Don't depend on Taint::Util, resolves a circular dependency 2010-03-12 Ævar Arnfjörð Bjarmason (0.07) * Util.pm: A new POD section titled "About tainting in Perl" inspired by RT#53988. Grammar fixes by Chris Nehren * t/usage.t: Skip the qr// test known to fail on <5.6.2 * t/usage.t: Test for $code and $code->() taintedness * Makefile.PL: Removed in the repository in favour of Dist::Zilla. This has no effect on users since Dist::Zilla is a distro compiler and not a build system. 2008-01-25 Ævar Arnfjörð Bjarmason (0.06) * Util.xs: Don't attempt to taint constants, it doesn't work and this fixes a bug on tainting hash keys in older perls * Util.pm: Use my own import routine instead of Exporter.pm, works on 5.6 now * Makefile.PL: Using EU::MM instead of M::I * t/export.t: Test importing a lot better * t/usage.t: Update tests for changes in Util.xs 2007-05-09 Ævar Arnfjörð Bjarmason (0.05) * t/reftaint.t: Specify how many tests are planned * Util.pm: Don't inherit from Exporter * Util.pm: POD: "used by perl" => "used by perl internally" 2007-03-21 Ævar Arnfjörð Bjarmason (0.04) * t/usage.t: Test for qr// taintness * t/reftaint.t: Test tainting of stringified objects * Util.pm: Section in taint/untaint explaining qr// and taintness of stringified objects * Util.pm: Minor rewording in POD * ChangeLog: s/Usage\.(pm|xs)/Util.$1/g 2007-03-17 Ævar Arnfjörð Bjarmason (0.03) * t/usage.t: A lot more tests * t/prototype.t: New tests for prototypes * Util.xs: Support multiple arguments to taint/untaint * Util.pm: Expanded a lot on the documentation 2007-03-14 Ævar Arnfjörð Bjarmason (0.02) * Util.pm: Re-worded and added to the POD * ChangeLog: Added a changelog file * Makefile.PL: Explicitly get version from Util.pm 2007-03-14 Ævar Arnfjörð Bjarmason (0.01) * Initial release dist.ini000644001750001750 44411350246153 14206 0ustar00avaravar000000000000Taint-Util-0.08name = Taint-Util author = Ævar Arnfjörð Bjarmason copyright_holder = Ævar Arnfjörð Bjarmason license = Perl_5 main_module = Util.pm [@AVAR] dist = Taint-Util bugtracker = rt no_AutoPrereq = 1 [Prereq] XSLoader = 0 Test::More = 0 t000755001750001750 011350246153 12664 5ustar00avaravar000000000000Taint-Util-0.08usage.t000644001750001750 674111350246153 14324 0ustar00avaravar000000000000Taint-Util-0.08/t#!/usr/bin/perl -T use strict; use Test::More tests => 74; use Taint::Util; # untainted my $s = 420; ok !tainted($s) => "fresh scalar untainted"; # taint taint($s); ok tainted($s) => "tainted my scalar"; # untaint untaint($s); ok !tainted($s) => "untainted my scalar"; # taint again taint($s); ok tainted($s) => "tainted my scalar again"; # taint/untaint never return true ok !untaint($s) => "return value of untaint"; ok !taint($s) => "return value of taint"; ok !untaint($s) => "return value of untaint"; # # Constant tainting # ok !tainted("goood") => "constant not tainted"; { local $@; eval { taint("bewbs") }; my $err = $@; chomp $err; # Don't put \n in TAP output ok(!$@, "We don't attempt to taint constants"); } # # Multiple arguments # my ($a, $b, $c) = qw(a b c); ok !tainted($a) => "fresh scalar \$a untainted"; ok !tainted($b) => "fresh scalar \$b untainted"; ok !tainted($c) => "fresh scalar \$c untainted"; taint($a, $b, $c); ok tainted($a) => "scalar \$a tainted"; ok tainted($b) => "scalar \$b tainted"; ok tainted($c) => "scalar \$c tainted"; untaint($a, $b, $c); ok !tainted($a) => "scalar \$a untainted"; ok !tainted($b) => "scalar \$a untainted"; ok !tainted($c) => "scalar \$a untainted"; # # Taint/untaint array elements # my @elem = ($a, $b, $c); ok !tainted($_) => "array elem untainted" for @elem; taint(@elem); ok tainted($_) => "array elem tainted" for @elem; untaint(@elem); ok !tainted($_) => "array elem tainted" for @elem; # # Hash keys can't be tainted # my %hv = qw(a b c d); taint(%hv); ok tainted($_) => "Hash value $_ tainted" for values %hv; ok !tainted($_) => "Hash key $_ untainted" for keys %hv; # # Tainting references # my $sv = 420; my $sr = \$sv; my $ar = [ qw(a o e u) ]; my $hr = { qw(a o e u) }; my $cr = sub { "tainted?" }; my $gr = \*STDIN; my $ov = bless [ qw(tainted magic) ] => "Mushrooms"; ok !tainted($_) => "$_ untainted" for ($sv, $sr, $ar, $hr); taint($sv, $sr, $ar, $hr); ok tainted($_) => "$_ tainted" for ($sv, $sr, $ar, $hr); untaint($sv, $sr, $ar, $hr); ok !tainted($_) => "$_ untainted" for ($sv, $sr, $ar, $hr); # SCALAR taint($sr); ok tainted($sr) => "SCALAR tainted..."; ok !tainted($sv) => "...but not its value"; ok !tainted($$sr) => "...but not its value"; untaint($sr); ok !tainted($sr) => "SCALAR untainted"; # ARRAY - Taint its elements but not it taint(@$ar[0..3]); ok !tainted($ar) => "ARRAY untainted"; ok tainted($_) => "ARRAY element $_ tainted" for @$ar; untaint(@$ar[0..3]); ok !tainted($_) => "ARRAY element $_ untainted" for @$ar; # CODE ok !tainted($cr) => "CODE untainted"; taint($cr); ok tainted($cr) => "CODE tainted"; ok tainted("$cr") => '"CODE" tainted'; ok !tainted($cr->()) => 'CODE->() untainted'; # GLOB ok !tainted(*$gr) => "*STDIN untainted"; taint(*STDIN); ok tainted(*$gr) => "*STDIN tainted"; # Blessed objects ok !tainted($ov) => "object untainted"; taint($ov); ok tainted($ov) => "object tainted"; # # Tainted file handles, a tainted handle does not taint its lines # ok !tainted(*DATA) => "*DATA untainted"; taint(*DATA); ok tainted(*DATA) => "*DATA tainted"; while () { chomp; like $_, qr/^ba[xyz]$/ => "DATA line $_"; ok !tainted($_) => "DATA line $_ untainted"; } # # qr// returns a blessed object which is tainted # taint(my $str = "bewbs"); ok tainted($str) => "New scalar tainted"; if ($] < 5.008) { SKIP: { skip "qr// tainted is known to fail on 5.6.2 and below" => 1; } } else { my $re = qr/$str/; ok tainted($re) => "qr// tainted"; } __DATA__ bax bay baz 00-compile.t000644001750001750 7711350246153 15021 0ustar00avaravar000000000000Taint-Util-0.08/tuse strict; use Test::More tests => 1; use_ok 'Taint::Util'; taint-non-T.t000644001750001750 37711350246153 15307 0ustar00avaravar000000000000Taint-Util-0.08/t=pod Try tainting when not under B<-T>. =cut use strict; use Test::More tests => 2; use Taint::Util; my $s = 420; ok !tainted($s) => "fresh scalar untainted"; # taint taint($s); ok !tainted($s) => "did not taint scalar when not under taint mode"; prototype.t000644001750001750 40211350246153 15231 0ustar00avaravar000000000000Taint-Util-0.08/tuse strict; use Taint::Util (); use Test::More tests => 3; is(prototype("Taint::Util::tainted"), undef, 'tainted prototype'); is(prototype("Taint::Util::taint"), undef, 'taint prototype'); is(prototype("Taint::Util::untaint"), undef, 'untaint prototype'); export.t000644001750001750 207311350246153 14533 0ustar00avaravar000000000000Taint-Util-0.08/tuse Test::More tests => 18; use Taint::Util (); sub unimport { undef *$_ for qw(taint untaint tainted); } ok(!defined &taint, 'taint unexported'); ok(!defined &untaint, 'untaint unexported'); ok(!defined &tainted, 'tainted unexported'); Taint::Util->import; ok(defined &taint, 'taint exported'); ok(defined &untaint, 'untaint exported'); ok(defined &tainted, 'tainted exported'); unimport(); ok(!(defined &taint), 'taint unexported'); ok(!(defined &untaint), 'untaint unexported'); ok(!(defined &tainted), 'tainted unexported'); unimport(); Taint::Util->import(qw(taint)); ok(defined &taint, 'taint exported'); ok(!(defined &untaint), 'untaint unexported'); ok(!(defined &tainted), 'tainted unexported'); unimport(); Taint::Util->import(qw(taint untaint)); ok(defined &taint, 'taint exported'); ok(defined &untaint, 'untaint exported'); ok(!(defined &tainted), 'tainted unexported'); unimport(); Taint::Util->import(qw(taint untaint tainted)); ok(defined &taint, 'taint exported'); ok(defined &untaint, 'untaint exported'); ok(defined &tainted, 'tainted unexported'); META.yml000644001750001750 133011350246153 14026 0ustar00avaravar000000000000Taint-Util-0.08--- abstract: 'Test for and flip the taint flag without regex matches or C' author: - 'Ævar Arnfjörð Bjarmason ' build_requires: {} configure_requires: ExtUtils::MakeMaker: 6.11 generated_by: 'Dist::Zilla version 1.100711' license: perl meta-spec: url: http://module-build.sourceforge.net/META-spec-v1.4.html version: 1.4 name: Taint-Util no_index: directory: - t requires: Test::More: 0 XSLoader: 0 resources: Ratings: http://cpanratings.perl.org/d/Taint-Util bugtracker: https://rt.cpan.org/Dist/Display.html?Name=Taint-Util homepage: http://search.cpan.org/dist/Taint-Util/ license: http://dev.perl.org/licenses/ repository: http://github.com/avar/taint-util version: 0.08 LICENSE000644001750001750 4356611350246153 13623 0ustar00avaravar000000000000Taint-Util-0.08This software is copyright (c) 2010 by Ævar Arnfjörð Bjarmason. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. Terms of the Perl programming language system itself a) the GNU General Public License as published by the Free Software Foundation; either version 1, or (at your option) any later version, or b) the "Artistic License" --- The GNU General Public License, Version 1, February 1989 --- This software is Copyright (c) 2010 by Ævar Arnfjörð Bjarmason. This is free software, licensed under: The GNU General Public License, Version 1, February 1989 GNU GENERAL PUBLIC LICENSE Version 1, February 1989 Copyright (C) 1989 Free Software Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The license agreements of most software companies try to keep users at the mercy of those companies. By contrast, our General Public License is intended to guarantee your freedom to share and change free software--to make sure the software is free for all its users. The General Public License applies to the Free Software Foundation's software and to any other program whose authors commit to using it. You can use it for your programs, too. When we speak of free software, we are referring to freedom, not price. Specifically, the General Public License is designed to make sure that you have the freedom to give away or sell copies of free software, that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs; and that you know you can do these things. To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or to ask you to surrender the rights. These restrictions translate to certain responsibilities for you if you distribute copies of the software, or if you modify it. For example, if you distribute copies of a such a program, whether gratis or for a fee, you must give the recipients all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must tell them their rights. We protect your rights with two steps: (1) copyright the software, and (2) offer you this license which gives you legal permission to copy, distribute and/or modify the software. Also, for each author's protection and ours, we want to make certain that everyone understands that there is no warranty for this free software. If the software is modified by someone else and passed on, we want its recipients to know that what they have is not the original, so that any problems introduced by others will not reflect on the original authors' reputations. The precise terms and conditions for copying, distribution and modification follow. GNU GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0. This License Agreement applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License. The "Program", below, refers to any such program or work, and a "work based on the Program" means either the Program or any work containing the Program or a portion of it, either verbatim or with modifications. Each licensee is addressed as "you". 1. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any medium, provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice and disclaimer of warranty; keep intact all the notices that refer to this General Public License and to the absence of any warranty; and give any other recipients of the Program a copy of this General Public License along with the Program. You may charge a fee for the physical act of transferring a copy. 2. You may modify your copy or copies of the Program or any portion of it, and copy and distribute such modifications under the terms of Paragraph 1 above, provided that you also do the following: a) cause the modified files to carry prominent notices stating that you changed the files and the date of any change; and b) cause the whole of any work that you distribute or publish, that in whole or in part contains the Program or any part thereof, either with or without modifications, to be licensed at no charge to all third parties under the terms of this General Public License (except that you may choose to grant warranty protection to some or all third parties, at your option). c) If the modified program normally reads commands interactively when run, you must cause it, when started running for such interactive use in the simplest and most usual way, to print or display an announcement including an appropriate copyright notice and a notice that there is no warranty (or else, saying that you provide a warranty) and that users may redistribute the program under these conditions, and telling the user how to view a copy of this General Public License. d) You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty protection in exchange for a fee. Mere aggregation of another independent work with the Program (or its derivative) on a volume of a storage or distribution medium does not bring the other work under the scope of these terms. 3. You may copy and distribute the Program (or a portion or derivative of it, under Paragraph 2) in object code or executable form under the terms of Paragraphs 1 and 2 above provided that you also do one of the following: a) accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms of Paragraphs 1 and 2 above; or, b) accompany it with a written offer, valid for at least three years, to give any third party free (except for a nominal charge for the cost of distribution) a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Paragraphs 1 and 2 above; or, c) accompany it with the information you received as to where the corresponding source code may be obtained. (This alternative is allowed only for noncommercial distribution and only if you received the program in object code or executable form alone.) Source code for a work means the preferred form of the work for making modifications to it. For an executable file, complete source code means all the source code for all modules it contains; but, as a special exception, it need not include source code for modules which are standard libraries that accompany the operating system on which the executable file runs, or for standard header files or definitions files that accompany that operating system. 4. You may not copy, modify, sublicense, distribute or transfer the Program except as expressly provided under this General Public License. Any attempt otherwise to copy, modify, sublicense, distribute or transfer the Program is void, and will automatically terminate your rights to use the Program under this License. However, parties who have received copies, or rights to use copies, from you under this General Public License will not have their licenses terminated so long as such parties remain in full compliance. 5. By copying, distributing or modifying the Program (or any work based on the Program) you indicate your acceptance of this license to do so, and all its terms and conditions. 6. Each time you redistribute the Program (or any work based on the Program), the recipient automatically receives a license from the original licensor to copy, distribute or modify the Program subject to these terms and conditions. You may not impose any further restrictions on the recipients' exercise of the rights granted herein. 7. The Free Software Foundation may publish revised and/or new versions of the General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Program specifies a version number of the license which applies to it and "any later version", you have the option of following the terms and conditions either of that version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of the license, you may choose any version ever published by the Free Software Foundation. 8. If you wish to incorporate parts of the Program into other free programs whose distribution conditions are different, write to the author to ask for permission. For software which is copyrighted by the Free Software Foundation, write to the Free Software Foundation; we sometimes make exceptions for this. Our decision will be guided by the two goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of software generally. NO WARRANTY 9. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 10. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. END OF TERMS AND CONDITIONS Appendix: How to Apply These Terms to Your New Programs If you develop a new program, and you want it to be of the greatest possible use to humanity, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) 19yy This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 1, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) 19xx name of author Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (a program to direct compilers to make passes at assemblers) written by James Hacker. , 1 April 1989 Ty Coon, President of Vice That's all there is to it! --- The Artistic License 1.0 --- This software is Copyright (c) 2010 by Ævar Arnfjörð Bjarmason. This is free software, licensed under: The Artistic License 1.0 The Artistic License Preamble The intent of this document is to state the conditions under which a Package may be copied, such that the Copyright Holder maintains some semblance of artistic control over the development of the package, while giving the users of the package the right to use and distribute the Package in a more-or-less customary fashion, plus the right to make reasonable modifications. Definitions: - "Package" refers to the collection of files distributed by the Copyright Holder, and derivatives of that collection of files created through textual modification. - "Standard Version" refers to such a Package if it has not been modified, or has been modified in accordance with the wishes of the Copyright Holder. - "Copyright Holder" is whoever is named in the copyright or copyrights for the package. - "You" is you, if you're thinking about copying or distributing this Package. - "Reasonable copying fee" is whatever you can justify on the basis of media cost, duplication charges, time of people involved, and so on. (You will not be required to justify it to the Copyright Holder, but only to the computing community at large as a market that must bear the fee.) - "Freely Available" means that no fee is charged for the item itself, though there may be fees involved in handling the item. It also means that recipients of the item may redistribute it under the same conditions they received it. 1. You may make and give away verbatim copies of the source form of the Standard Version of this Package without restriction, provided that you duplicate all of the original copyright notices and associated disclaimers. 2. You may apply bug fixes, portability fixes and other modifications derived from the Public Domain or from the Copyright Holder. A Package modified in such a way shall still be considered the Standard Version. 3. You may otherwise modify your copy of this Package in any way, provided that you insert a prominent notice in each changed file stating how and when you changed that file, and provided that you do at least ONE of the following: a) place your modifications in the Public Domain or otherwise make them Freely Available, such as by posting said modifications to Usenet or an equivalent medium, or placing the modifications on a major archive site such as ftp.uu.net, or by allowing the Copyright Holder to include your modifications in the Standard Version of the Package. b) use the modified Package only within your corporation or organization. c) rename any non-standard executables so the names do not conflict with standard executables, which must also be provided, and provide a separate manual page for each non-standard executable that clearly documents how it differs from the Standard Version. d) make other distribution arrangements with the Copyright Holder. 4. You may distribute the programs of this Package in object code or executable form, provided that you do at least ONE of the following: a) distribute a Standard Version of the executables and library files, together with instructions (in the manual page or equivalent) on where to get the Standard Version. b) accompany the distribution with the machine-readable source of the Package with your modifications. c) accompany any non-standard executables with their corresponding Standard Version executables, giving the non-standard executables non-standard names, and clearly documenting the differences in manual pages (or equivalent), together with instructions on where to get the Standard Version. d) make other distribution arrangements with the Copyright Holder. 5. You may charge a reasonable copying fee for any distribution of this Package. You may charge any fee you choose for support of this Package. You may not charge a fee for this Package itself. However, you may distribute this Package in aggregate with other (possibly commercial) programs as part of a larger (possibly commercial) software distribution provided that you do not advertise this Package as a product of your own. 6. The scripts and library files supplied as input to or produced as output from the programs of this Package do not automatically fall under the copyright of this Package, but belong to whomever generated them, and may be sold commercially, and may be aggregated with this Package. 7. C or perl subroutines supplied by you and linked into this Package shall not be considered part of this Package. 8. The name of the Copyright Holder may not be used to endorse or promote products derived from this software without specific prior written permission. 9. THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. The End README000644001750001750 1200111350246153 13452 0ustar00avaravar000000000000Taint-Util-0.08NAME Taint::Util - Test for and flip the taint flag without regex matches or "eval" SYNOPSIS #!/usr/bin/env perl -T use Taint::Util; # eek! untaint $ENV{PATH}; # $sv now tainted under taint mode (-T) taint(my $sv = "hlagh"); # Untaint $sv again untaint $sv if tainted $sv; DESCRIPTION Wraps perl's internal routines for checking and setting the taint flag and thus does not rely on regular expressions for untainting or odd tricks involving "eval" and "kill" for checking whether data is tainted, instead it checks and flips a flag on the scalar in-place. FUNCTIONS tainted Returns a boolean indicating whether a scalar is tainted. Always false when not under taint mode. taint & untaint Taints or untaints given values, arrays will be flattened and their elements tainted, likewise with the values of hashes (keys can't be tainted, see perlsec). Returns no value (which evaluates to false). untaint(%ENV); # Untaints the environment taint(my @hlagh = qw(a o e u)); # elements of @hlagh now tainted References (being scalars) can also be tainted, a stringified reference reference raises an error where a tainted scalar would: taint(my $ar = \@hlagh); system echo => $ar; # err: Insecure dependency in system This feature is used by perl internally to taint the blessed object "qr//" stringifies to. taint(my $str = "oh noes"); my $re = qr/$str/; system echo => $re; # err: Insecure dependency in system This does not mean that tainted blessed objects with overloaded stringification via overload need return a tainted object since those objects may return a non-tainted scalar when stringified (see t/usage.t for an example). The internal handling of "qr//" however ensures that this holds true. File handles can also be tainted, but this is pretty useless as the handle itself and not lines retrieved from it will be tainted, see the next section for details. taint(*DATA); # *DATA tainted my $ln = ; # $ln not tainted About tainting in Perl Since this module is a low level interface that directly exposes the internal "SvTAINTED*" functions it also presents new and exciting ways for shooting yourself in the foot. Tainting in Perl was always meant to be used for potentially hostile external data passed to the program. Perl is passed a soup of strings from the outside; it never receives any complex datatypes directly. For instance, you might get tainted hash keys in %ENV or tainted strings from *STDIN, but you'll never get a tainted Hash reference or a tainted subroutine. Internally, the perl compiler sets the taint flag on external data in a select few functions mainly having to do with IO and string operations. For example, the "ucfirst" function will manually set a tainted flag on its newly created string depending on whether the original was tainted or not. However, since Taint::Util is exposing some of perl's guts, things get more complex. Internally, tainting is implemented via perl's MAGIC facility, which allows you to attach attach magic to any scalar, but since perl doesn't liberally taint scalars it's there to back you up if you do. You can "taint(*DATA)" and "tainted(*DATA)" will subsequently be true but if you read from the filehandle via "" you'll get untainted data back. As you might have guessed this is completely useless. The test file t/usage.t highlights some of these edge cases. Back in the real world, the only reason tainting makes sense is because perl will back you up when you use it, e.g. it will slap your hand if you try to pass a tainted value to system(). If you taint references, perl doesn't offer that protection, because it doesn't know anything about tainted references since it would never create one. The things that do work like the stringification of "taint($t = [])" (i.e. "ARRAY(0x11a5d48)") being tainted only work incidentally. But I'm not going to stop you. By all means, have at it! Just don't expect it to do anything more useful than warming up your computer. See RT #53988 for the bug that inspired this section. EXPORTS Exports "tainted", "taint" and "untaint" by default. Individual functions can be exported by specifying them in the "use" list, to export none use "()". HISTORY I wrote this when implementing re::engine::Plugin so that someone writing a custom regex engine with it wouldn't have to rely on perl regexps for untainting capture variables, which would be a bit odd. SEE ALSO perlsec AUTHOR Ævar Arnfjörð Bjarmason LICENSE Copyright 2007-2010 Ævar Arnfjörð Bjarmason. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. META.json000644001750001750 176011350246153 14205 0ustar00avaravar000000000000Taint-Util-0.08{ "resources" : { "homepage" : "http://search.cpan.org/dist/Taint-Util/", "repository" : "http://github.com/avar/taint-util", "bugtracker" : "https://rt.cpan.org/Dist/Display.html?Name=Taint-Util", "license" : "http://dev.perl.org/licenses/", "Ratings" : "http://cpanratings.perl.org/d/Taint-Util" }, "no_index" : { "directory" : [ "t" ] }, "generated_by" : "Dist::Zilla version 1.100711", "meta-spec" : { "version" : 1.4, "url" : "http://module-build.sourceforge.net/META-spec-v1.4.html" }, "version" : "0.08", "name" : "Taint-Util", "author" : [ "\u00c3\u0086var Arnfj\u00c3\u00b6r\u00c3\u00b0 Bjarmason " ], "license" : "perl", "build_requires" : {}, "requires" : { "Test::More" : "0", "XSLoader" : "0" }, "abstract" : "Test for and flip the taint flag without regex matches or C", "configure_requires" : { "ExtUtils::MakeMaker" : "6.11" } } MANIFEST000644001750001750 21711350246153 13671 0ustar00avaravar000000000000Taint-Util-0.08ChangeLog LICENSE MANIFEST META.json META.yml README Util.pm Util.xs dist.ini t/00-compile.t t/export.t t/prototype.t t/taint-non-T.t t/usage.tMakefile.PL000644001750001750 145111350246153 14533 0ustar00avaravar000000000000Taint-Util-0.08# This Makefile.PL for Taint-Util was generated by Dist::Zilla. # Don't edit it but the dist.ini used to construct it. use strict; use warnings; use ExtUtils::MakeMaker 6.11; my %WriteMakefileArgs = ( 'ABSTRACT' => 'Test for and flip the taint flag without regex matches or C', 'AUTHOR' => 'Ævar Arnfjörð Bjarmason ', 'BUILD_REQUIRES' => {}, 'CONFIGURE_REQUIRES' => { 'ExtUtils::MakeMaker' => '6.11' }, 'DISTNAME' => 'Taint-Util', 'EXE_FILES' => [], 'LICENSE' => 'perl', 'NAME' => 'Taint::Util', 'PREREQ_PM' => { 'Test::More' => '0', 'XSLoader' => '0' }, 'VERSION' => '0.08', 'test' => { 'TESTS' => 't/*.t' } ); delete $WriteMakefileArgs{LICENSE} unless eval { ExtUtils::MakeMaker->VERSION(6.31) }; WriteMakefile(%WriteMakefileArgs);