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2     //$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/webprojs/fboprime/sw/phplib/sid.inc,v 1.3 2006/04/08 07:14:16 dashley Exp $
3     //********************************************************************************
4     //Copyright (C) 2006 David T. Ashley
5     //********************************************************************************
6     //This program or source file is free software; you can redistribute it and/or
7     //modify it under the terms of the GNU General Public License as published by
8     //the Free Software Foundation; either version 2 of the License, or (at your
9     //option) any later version.
10     //
11     //This program or source file is distributed in the hope that it will
12     //be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
13     //MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14     //GNU General Public License for more details.
15     //
16     //You may have received a copy of the GNU General Public License
17     //along with this program; if not, write to the Free Software
18     //Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19     //********************************************************************************
20     //Dave Ashley, 04/06
21     //-------------------------------------------------------------------------------------------------
22     //Copyright 2006 David T. Ashley
23     //-------------------------------------------------------------------------------------------------
24     //This source code and any program in which it is compiled/used is provided under the GNU GENERAL
25     //PUBLIC LICENSE, Version 3, full license text below.
26     //-------------------------------------------------------------------------------------------------
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506     //by this License, of making, using, or selling its contributor version,
507     //but do not include claims that would be infringed only as a
508     //consequence of further modification of the contributor version. For
509     //purposes of this definition, "control" includes the right to grant
510     //patent sublicenses in a manner consistent with the requirements of
511     //this License.
512     //
513     // Each contributor grants you a non-exclusive, worldwide, royalty-free
514     //patent license under the contributor's essential patent claims, to
515     //make, use, sell, offer for sale, import and otherwise run, modify and
516     //propagate the contents of its contributor version.
517     //
518     // In the following three paragraphs, a "patent license" is any express
519     //agreement or commitment, however denominated, not to enforce a patent
520     //(such as an express permission to practice a patent or covenant not to
521     //sue for patent infringement). To "grant" such a patent license to a
522     //party means to make such an agreement or commitment not to enforce a
523     //patent against the party.
524     //
525     // If you convey a covered work, knowingly relying on a patent license,
526     //and the Corresponding Source of the work is not available for anyone
527     //to copy, free of charge and under the terms of this License, through a
528     //publicly available network server or other readily accessible means,
529     //then you must either (1) cause the Corresponding Source to be so
530     //available, or (2) arrange to deprive yourself of the benefit of the
531     //patent license for this particular work, or (3) arrange, in a manner
532     //consistent with the requirements of this License, to extend the patent
533     //license to downstream recipients. "Knowingly relying" means you have
534     //actual knowledge that, but for the patent license, your conveying the
535     //covered work in a country, or your recipient's use of the covered work
536     //in a country, would infringe one or more identifiable patents in that
537     //country that you have reason to believe are valid.
538     //
539     // If, pursuant to or in connection with a single transaction or
540     //arrangement, you convey, or propagate by procuring conveyance of, a
541     //covered work, and grant a patent license to some of the parties
542     //receiving the covered work authorizing them to use, propagate, modify
543     //or convey a specific copy of the covered work, then the patent license
544     //you grant is automatically extended to all recipients of the covered
545     //work and works based on it.
546     //
547     // A patent license is "discriminatory" if it does not include within
548     //the scope of its coverage, prohibits the exercise of, or is
549     //conditioned on the non-exercise of one or more of the rights that are
550     //specifically granted under this License. You may not convey a covered
551     //work if you are a party to an arrangement with a third party that is
552     //in the business of distributing software, under which you make payment
553     //to the third party based on the extent of your activity of conveying
554     //the work, and under which the third party grants, to any of the
555     //parties who would receive the covered work from you, a discriminatory
556     //patent license (a) in connection with copies of the covered work
557     //conveyed by you (or copies made from those copies), or (b) primarily
558     //for and in connection with specific products or compilations that
559     //contain the covered work, unless you entered into that arrangement,
560     //or that patent license was granted, prior to 28 March 2007.
561     //
562     // Nothing in this License shall be construed as excluding or limiting
563     //any implied license or other defenses to infringement that may
564     //otherwise be available to you under applicable patent law.
565     //
566     // 12. No Surrender of Others' Freedom.
567     //
568     // If conditions are imposed on you (whether by court order, agreement or
569     //otherwise) that contradict the conditions of this License, they do not
570     //excuse you from the conditions of this License. If you cannot convey a
571     //covered work so as to satisfy simultaneously your obligations under this
572     //License and any other pertinent obligations, then as a consequence you may
573     //not convey it at all. For example, if you agree to terms that obligate you
574     //to collect a royalty for further conveying from those to whom you convey
575     //the Program, the only way you could satisfy both those terms and this
576     //License would be to refrain entirely from conveying the Program.
577     //
578     // 13. Use with the GNU Affero General Public License.
579     //
580     // Notwithstanding any other provision of this License, you have
581     //permission to link or combine any covered work with a work licensed
582     //under version 3 of the GNU Affero General Public License into a single
583     //combined work, and to convey the resulting work. The terms of this
584     //License will continue to apply to the part which is the covered work,
585     //but the special requirements of the GNU Affero General Public License,
586     //section 13, concerning interaction through a network will apply to the
587     //combination as such.
588     //
589     // 14. Revised Versions of this License.
590     //
591     // The Free Software Foundation may publish revised and/or new versions of
592     //the GNU General Public License from time to time. Such new versions will
593     //be similar in spirit to the present version, but may differ in detail to
594     //address new problems or concerns.
595     //
596     // Each version is given a distinguishing version number. If the
597     //Program specifies that a certain numbered version of the GNU General
598     //Public License "or any later version" applies to it, you have the
599     //option of following the terms and conditions either of that numbered
600     //version or of any later version published by the Free Software
601     //Foundation. If the Program does not specify a version number of the
602     //GNU General Public License, you may choose any version ever published
603     //by the Free Software Foundation.
604     //
605     // If the Program specifies that a proxy can decide which future
606     //versions of the GNU General Public License can be used, that proxy's
607     //public statement of acceptance of a version permanently authorizes you
608     //to choose that version for the Program.
609     //
610     // Later license versions may give you additional or different
611     //permissions. However, no additional obligations are imposed on any
612     //author or copyright holder as a result of your choosing to follow a
613     //later version.
614     //
615     // 15. Disclaimer of Warranty.
616     //
617     // THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
618     //APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
619     //HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
620     //OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
621     //THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
622     //PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
623     //IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
624     //ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
625     //
626     // 16. Limitation of Liability.
627     //
628     // IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
629     //WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
630     //THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
631     //GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
632     //USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
633     //DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
634     //PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
635     //EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
636     //SUCH DAMAGES.
637     //
638     // 17. Interpretation of Sections 15 and 16.
639     //
640     // If the disclaimer of warranty and limitation of liability provided
641     //above cannot be given local legal effect according to their terms,
642     //reviewing courts shall apply local law that most closely approximates
643     //an absolute waiver of all civil liability in connection with the
644     //Program, unless a warranty or assumption of liability accompanies a
645     //copy of the Program in return for a fee.
646     //
647     // END OF TERMS AND CONDITIONS
648     //
649     // How to Apply These Terms to Your New Programs
650     //
651     // If you develop a new program, and you want it to be of the greatest
652     //possible use to the public, the best way to achieve this is to make it
653     //free software which everyone can redistribute and change under these terms.
654     //
655     // To do so, attach the following notices to the program. It is safest
656     //to attach them to the start of each source file to most effectively
657     //state the exclusion of warranty; and each file should have at least
658     //the "copyright" line and a pointer to where the full notice is found.
659     //
660     // <one line to give the program's name and a brief idea of what it does.>
661     // Copyright (C) <year> <name of author>
662     //
663     // This program is free software: you can redistribute it and/or modify
664     // it under the terms of the GNU General Public License as published by
665     // the Free Software Foundation, either version 3 of the License, or
666     // (at your option) any later version.
667     //
668     // This program is distributed in the hope that it will be useful,
669     // but WITHOUT ANY WARRANTY; without even the implied warranty of
670     // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
671     // GNU General Public License for more details.
672     //
673     // You should have received a copy of the GNU General Public License
674     // along with this program. If not, see <http://www.gnu.org/licenses/>.
675     //
676     //Also add information on how to contact you by electronic and paper mail.
677     //
678     // If the program does terminal interaction, make it output a short
679     //notice like this when it starts in an interactive mode:
680     //
681     // <program> Copyright (C) <year> <name of author>
682     // This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
683     // This is free software, and you are welcome to redistribute it
684     // under certain conditions; type `show c' for details.
685     //
686     //The hypothetical commands `show w' and `show c' should show the appropriate
687     //parts of the General Public License. Of course, your program's commands
688     //might be different; for a GUI interface, you would use an "about box".
689     //
690     // You should also get your employer (if you work as a programmer) or school,
691     //if any, to sign a "copyright disclaimer" for the program, if necessary.
692     //For more information on this, and how to apply and follow the GNU GPL, see
693     //<http://www.gnu.org/licenses/>.
694     //
695     // The GNU General Public License does not permit incorporating your program
696     //into proprietary programs. If your program is a subroutine library, you
697     //may consider it more useful to permit linking proprietary applications with
698     //the library. If this is what you want to do, use the GNU Lesser General
699     //Public License instead of this License. But first, please read
700     //<http://www.gnu.org/philosophy/why-not-lgpl.html>.
701     //-------------------------------------------------------------------------------------------------
702     //
703     //This source file provides the code to create and manipulate session
704     //identifiers (SIDs). The format of the SGUID is documented in the
705     //FBO-Prime manual.
706     //
707     require_once("sguid.inc"); //Necesssary to generate SGUIDs.
708     require_once("crhsh.inc");
709     //
710     //
711     //--------------------------------------------------------------------------------
712     //Returns a complete SID (including the "SI" prefix).
713     //
714     function SID_sid()
715     {
716     return("SI" . SID_sid_raw());
717     }
718     //
719     //
720     //--------------------------------------------------------------------------------
721     //Returns a raw SID (without the "SI" prefix).
722     //
723     function SID_sid_raw()
724     {
725     $sguid = SGUID_sguid();
726     $crhash = CRHSH_hashva($sguid);
727    
728     //Convert any lower-case letters in the hash to upper-case. This is canonical form.
729     $crhash = StrToUpper($crhash);
730    
731     return($sguid . $crhash);
732     }
733     //
734     //
735     //--------------------------------------------------------------------------------
736     //Returns the length of a SID (in characters).
737     //
738     function SID_sid_len()
739     {
740     return(66);
741     }
742     //
743     //
744     //--------------------------------------------------------------------------------
745     //Validates the syntactic form of a SID. Returns 0 if it isn't
746     //valid or 1 if it is. Note that this validates only the form and the
747     //hash--the server session state aspect is not validated.
748     //
749     function SID_is_syntactically_valid($sid_to_check)
750     {
751     //Must be a string.
752     if (! is_string($sid_to_check))
753     return(0);
754    
755     //Must be of the right length.
756     if (strlen($sid_to_check) != 66)
757     return(0);
758    
759     //First two characters must be "SI".
760     if (substr($sid_to_check, 0, 2) !== "SI")
761     return(0);
762    
763     //The encapsulated SGUID must be valid.
764     if (! SGUID_is_syntactically_valid(SubStr($sid_to_check, 2, 32)))
765     return(0);
766    
767     //Generate a hash to match against.
768     $original_hash = SubStr($sid_to_check, 34, 32);
769     $comparison_hash = StrToUpper(CRHSH_hashva(SubStr($sid_to_check, 2, 32)));
770    
771     //Compare the hashes. Note that we don't have to check the string to be sure
772     //hash chars are digits and hexadecimal digits--the comparison indirectly does
773     //that for us.
774     if ($original_hash != $comparison_hash)
775     return(0);
776    
777     //If we're here, nothing obvious wrong with it.
778     return(1);
779     }
780     //--------------------------------------------------------------------------------
781     ?>

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