rephrase-0.1/0040775000175000017500000000000007725444047011660 5ustar philphilrephrase-0.1/COPYING0100664000175000017500000004311007724052760012703 0ustar philphil GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 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 licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU 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. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is covered by the GNU Library General Public License instead.) You can apply it to your programs, too. When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for this service if you wish), 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 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 show them these terms so they know 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. Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at all. 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 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 derivative work under copyright law: that is to say, a work containing the Program or a portion of it, either verbatim or with modifications and/or translated into another language. (Hereinafter, translation is included without limitation in the term "modification".) Each licensee is addressed as "you". Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents constitute a work based on the Program (independent of having been made by running the Program). Whether that is true depends on what the Program does. 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 License and to the absence of any warranty; and give any other recipients of the Program a copy of this License along with the Program. 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. 2. You may modify your copy or copies of the Program or any portion of it, thus forming a work based on the Program, and copy and distribute such modifications or work under the terms of Section 1 above, provided that you also meet all of these conditions: a) You must cause the modified files to carry prominent notices stating that you changed the files and the date of any change. b) You must cause any work that you distribute or publish, that in whole or in part contains or is derived from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this License. c) If the modified program normally reads commands interactively when run, you must cause it, when started running for such interactive use in the most ordinary 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 License. (Exception: if the Program itself is interactive but does not normally print such an announcement, your work based on the Program is not required to print an announcement.) These requirements apply to the modified work as a whole. If identifiable sections of that work are not derived from the Program, and can be reasonably considered independent and separate works in themselves, then this License, and its terms, do not apply to those sections when you distribute them as separate works. But when you distribute the same sections as part of a whole which is a work based on the Program, the distribution of the whole must be on the terms of this License, whose permissions for other licensees extend to the entire whole, and thus to each and every part regardless of who wrote it. Thus, it is not the intent of this section to claim rights or contest your rights to work written entirely by you; rather, the intent is to exercise the right to control the distribution of derivative or collective works based on the Program. In addition, mere aggregation of another work not based on the Program with the Program (or with a work based on the Program) on a volume of a storage or distribution medium does not bring the other work under the scope of this License. 3. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form under the terms of Sections 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 Sections 1 and 2 above on a medium customarily used for software interchange; or, b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, c) Accompany it with the information you received as to the offer to distribute corresponding source code. (This alternative is allowed only for noncommercial distribution and only if you received the program in object code or executable form with such an offer, in accord with Subsection b above.) The source code for a work means the preferred form of the work for making modifications to it. For an executable work, complete source code means all the source code for all modules it contains, plus any associated interface definition files, plus the scripts used to control compilation and installation of the executable. However, as a special exception, the source code distributed need not include anything that is normally distributed (in either source or binary form) with the major components (compiler, kernel, and so on) of the operating system on which the executable runs, unless that component itself accompanies the executable. If distribution of executable or object code is made by offering access to copy from a designated place, then offering equivalent access to copy the source code from the same place counts as distribution of the source code, even though third parties are not compelled to copy the source along with the object code. 4. You may not copy, modify, sublicense, or distribute the Program except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense or distribute the Program is void, and will automatically terminate your rights under this License. However, parties who have received copies, or rights, from you under this License will not have their licenses terminated so long as such parties remain in full compliance. 5. You are not required to accept this License, since you have not signed it. However, nothing else grants you permission to modify or distribute the Program or its derivative works. These actions are prohibited by law if you do not accept this License. Therefore, by modifying or distributing 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 for copying, distributing or modifying the Program or works based on it. 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. You are not responsible for enforcing compliance by third parties to this License. 7. If, as a consequence of a court judgment or allegation of patent infringement or for any other reason (not limited to patent issues), conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot distribute so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not distribute the Program at all. For example, if a patent license would not permit royalty-free redistribution of the Program by all those who receive copies directly or indirectly through you, then the only way you could satisfy both it and this License would be to refrain entirely from distribution of the Program. If any portion of this section is held invalid or unenforceable under any particular circumstance, the balance of the section is intended to apply and the section as a whole is intended to apply in other circumstances. It is not the purpose of this section to induce you to infringe any patents or other property right claims or to contest validity of any such claims; this section has the sole purpose of protecting the integrity of the free software distribution system, which is implemented by public license practices. Many people have made generous contributions to the wide range of software distributed through that system in reliance on consistent application of that system; it is up to the author/donor to decide if he or she is willing to distribute software through any other system and a licensee cannot impose that choice. This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License. 8. If the distribution and/or use of the Program is restricted in certain countries either by patents or by copyrighted interfaces, the original copyright holder who places the Program under this License may add an explicit geographical distribution limitation excluding those countries, so that distribution is permitted only in or among countries not thus excluded. In such case, this License incorporates the limitation as if written in the body of this License. 9. 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 this 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 this License, you may choose any version ever published by the Free Software Foundation. 10. 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 11. 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. 12. 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 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 the public, 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) 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 2 of the License, 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) year 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 is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. , 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Library General Public License instead of this License. rephrase-0.1/Makefile0100664000175000017500000000356207725272740013322 0ustar philphil# Makefile (for compiling and installing, or building a distribution) # Copyright (C) 2003 Phil Lanch # # This file is part of Rephrase. # # Rephrase 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; version 2. # # Rephrase 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 # $Id: Makefile,v 1.1 2003/09/03 05:02:24 phil Exp $ SHELL = /bin/sh program = rephrase version = 0.1 what = $(program)-$(version) GPG = ifneq (,$(GPG)) gpg_def = -DGPG=\"$(GPG)\" else gpg_def = endif PATTERN_MAX = ifneq (,$(PATTERN_MAX)) pattern_max_def = -DPATTERN_MAX=$(PATTERN_MAX) else pattern_max_def = endif CFLAGS = -Wall -DVERSION=\"$(version)\" $(gpg_def) $(pattern_max_def) BINDIR = /usr/local/bin files = COPYING Makefile README $(program).c all: $(program) dist: $(what).tar.gz $(what).tar.bz2 install: all mkdir -p $(BINDIR) rm -f $(BINDIR)/$(program) cp $(program) $(BINDIR)/$(program) chmod 4711 $(BINDIR)/$(program) $(what).tar: $(files) rm -f $@ rm -rf TREE mkdir TREE mkdir TREE/$(what) cp -p $(files) TREE/$(what) cd TREE && { tar -c -f ../$@ $(what) || { rm -f ../$@ && exit 1; }; } $(what).tar.gz: $(what).tar rm -f $@ gzip -c -9 $< > $@ || { rm -f $@ && exit 1; } $(what).tar.bz2: $(what).tar rm -f $@ bzip2 -k -9 $< || { rm -f $@ && exit 1; } clean:: rm -f $(program) $(program)-*.tar rm -rf TREE distclean:: $(MAKE) clean rm -f $(program)-*.tar.gz $(program)-*.tar.bz2 rephrase-0.1/README0100664000175000017500000002062007725444026012532 0ustar philphil Rephrase ------------- Version 0.1 README (what it does, what it doesn't, how to use it, how to complain) Copyright (C) 2003 Phil Lanch This file is part of Rephrase. Rephrase 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; version 2. Rephrase 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 $Id: README,v 1.3 2003/09/03 19:59:18 phil Exp $ About ----- Rephrase is a specialized passphrase recovery tool for GnuPG[1]. If you can nearly remember your GnuPG passphrase - but not quite - then Rephrase may be able to help. Tell Rephrase the parts of the passphrase you know, and any number of alternatives for the parts you're not sure about; and Rephrase will try all the alternatives, in all possible combinations, and tell you which combination (if any) gives you the correct passphrase. You could try all the combinations yourself, of course, if there are just a handful of them; but if there are more, that might be impractical. On the other hand, if you need to try a huge number of possible passphrases, Rephrase might be too slow; it is far from being an efficient passphrase cracker. E.g. Rephrase can try out about 2600 possible passphrases per minute on my 1GHz Athlon (with other processes doing nothing very heavy at the same time). How many passphrases Rephrase can try depends on how long you are prepared to wait! Rephrase can reasonably be run for a long time; e.g. it *won't* use more memory the longer it runs. It would be a Bad Thing to leave your passphrase (or part of it, or your guesses at it) lying around on your hard drive; since a passphrase is supposed to be an extra line of defence if an attacker obtains access to your secret keyring (which you presumably *do* keep on your hard drive). That's why Rephrase keeps all the information about your passphrase that you give it in secure memory (and then pipes each possible passphrase to a child gpg process). For this reason, Rephrase is likely to be more secure than alternative solutions that involve generating a list of possible passphrases in a file and then testing them. [1]For more information about GnuPG, see http://www.gnupg.org/ . Prerequisites ------------- * GnuPG * C compiler * POSIX (i.e. a Unix-like system) For portability issues, see below, under "Bugs". Installation ------------ Um, did you download and unpack the tarball? It takes 2 commands to install Rephrase. (1) make There are 2 arguments you might need to add. (a) If gpg is not installed at /usr/local/bin/gpg, then you need to specify its full path e.g. make GPG=/usr/bin/gpg (b) If you might want to type in a pattern (patterns are explained below, under "Manual") longer than 512 characters, then you need (help and) to specify a maximum pattern length e.g. make PATTERN_MAX=1024 So if both (a) and (b) apply, then this command could become e.g. make GPG=/usr/bin/gpg PATTERN_MAX=1024 If you need to re-make with different arguments, then you first need to make clean (2) make install You *must* run this command as root. There's 1 argument you might need to add. If you don't want rephrase installed in /usr/local/bin, then specify an alternative installation directory e.g. make install BINDIR=/usr/bin Manual ------ Usage: rephrase where is the key whose passphrase you want to recover; you can identify the key in any of the ways that GnuPG understands. (To make sure you're using a sensible value for , you could first try gpg --list-secret-keys which should list exactly 1 key.) You will be prompted to enter a pattern (the pattern is not echoed to the screen as you type it). So what's a pattern? Suppose you know that your passphrase was something like "super-secret", but you're not sure if you changed some (or all) of the "e"s into "3"s, or any of the consonants into upper case, or indeed changed the "c" into "k" or "K" or even "|<", or changed the "-" into " " or just omitted it. Then you could enter this pattern: (s|S)u(p|P)(e|3)(r|R)(-| |)(s|S)(e|3)(c|C|k|K|\|<)(r|R)(e|3)(t|T) The pattern is your passphrase - except that 4 characters have special meanings. Brackets - "(" and ")" - are used to group alternatives wherever you're not sure what characters are correct; "|" is used inside a pair of brackets to separate the alternatives; and "\" is used to escape any of the 4 special characters when you need to use it literally. Rephrase will tell you if your pattern contains a syntax error. That happens if there are unbalanced brackets (i.e. they aren't in proper pairs); or if the pattern ends with "\" (because then there's nothing for it to escape). It also happens (and these cases are limitations in Rephrase's simple pattern parser) if you try to nest pairs of brackets; or if you try to use "|" anywhere that's not inside a pair of brackets. If the pattern contains no syntax errors, Rephrase will try each possible passphrase matching the pattern in turn. If the correct passphrase is found, Rephrase won't actually tell you what it is (in case someone's looking over your shoulder), but will tell you a string of numbers: you can work out the correct passphrase from these numbers and the pattern you entered. E.g. 2 1 2 1 2 1 1 5 1 2 2 The first number - 2 - means that at the first pair of brackets in the pattern - "(s|S)" - you must take the second alternative - viz. "S". The second number - 1 - means that at the seconds pair of brackets - "(p|P)" - you must take the first alternative - viz. "p". And so forth. So in this case the correct passphrase is "Sup3r se| incorretly; how to check that the value of is OK is explained above.) Rephrase's exit status is 0 is the passphrase is found, 1 if it's not found, or other values if an error occurs. Security -------- The good news is that Rephrase uses mlock() in order to keep the information about passphrases that it's given as secure as possible. The bad news is that using mlock() requires root privileges, so Rephrase needs to be setuid root. However, it does drop root privileges very quickly, as soon as it has called mlock(). It's also debatable whether mlock() is a proper way to protect sensitive information. According to POSIX, mlock()ing a page guarantees that it *is* in memory (useful for realtime applications), not that it *isn't* in the swap (useful for security applications). Possibly an encrypted swap partition (or no swap partition) is a better solution. Anyway, GnuPG itself uses mlock(), which makes it sensible for Rephrase to follow suit. Bugs ---- Portability is untested: I have only used Rephrase on a GNU/Linux system (Linux 2.4.21 and Glibc 2.3.2; building with GNU Make 3.79.1, bash 2.05 (as /bin/sh) and either GCC 2.95.3 or GCC 3.3). I believe setreuid() is a BSD-ism, so it may not exist on more SysV-like systems. There are probably many other issues. If mlock() fails (probably because Rephrase is not setuid root), Rephrase refuses to proceed: it would be better to issue a warning and continue, since that's what GnuPG does. Before it asks you to enter a pattern, Rephrase should check that the argument does refer to exactly 1 key and that that key is available. If you'd like Rephrase to be faster, then it's too slow. (But if you're happy with it, then it's fast enough.) The standard --version and --help options are unimplemented. Please send bug reports to me at Phil Lanch I'm especially interested in reports of * successes or failures on different operating systems (including full details of the system and what didn't work) * anyone who cares about the other bugs listed above (if you care about them, I might fix them) * new bugs rephrase-0.1/rephrase.c0100664000175000017500000002131007725272740013626 0ustar philphil/* rephrase.c (the main program) * Copyright (C) 2003 Phil Lanch * * This file is part of Rephrase. * * Rephrase 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; version 2. * * Rephrase 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 */ /* $Id: rephrase.c,v 1.1 2003/09/03 05:02:24 phil Exp $ */ #include #include #include #include #include #include #include #include #include #include #define PROGRAM "rephrase" #ifndef VERSION #error VERSION must be defined #endif #ifndef GPG #define GPG "/usr/local/bin/gpg" #endif #ifndef PATTERN_MAX #define PATTERN_MAX 512 #endif #define ALTERNATIVES_MAX ((PATTERN_MAX + 1) / 2) const char LF = '\n'; struct secrets { char pattern[PATTERN_MAX + 1]; int alternatives[ALTERNATIVES_MAX]; int try[ALTERNATIVES_MAX]; int i, a, b, alt_n; short is_alt, is_literal, error; ssize_t io_count; }; void read_pattern (struct secrets *s) { FILE *tty_fp; struct termios term_save, term; int pattern_err; if (!(tty_fp = fopen ("/dev/tty", "r+"))) { perror ("fopen: "); exit (8); } if (tcgetattr (fileno (tty_fp), &term_save)) { perror ("tcgetattr: "); exit (9); } term = term_save; term.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL); if (tcsetattr (fileno (tty_fp), TCSAFLUSH, &term)) { perror ("(1st) tcsetattr: "); exit (10); } fprintf (tty_fp, "Enter pattern: "); fflush (tty_fp); for (s->i = 0, pattern_err = 0; s->i <= PATTERN_MAX; ++s->i) { while (!(s->io_count = read (fileno (tty_fp), s->pattern + s->i, 1))) { sleep (1); } if (s->io_count == -1) { fprintf (tty_fp, "\n"); perror ("read: "); pattern_err = 11; break; } if (s->pattern[s->i] == '\n') { s->pattern[s->i] = '\0'; fprintf (tty_fp, "\n"); break; } } if (s->i > PATTERN_MAX) { do { while (!(s->io_count = read (fileno (tty_fp), s->pattern, 1))) { sleep (1); } if (s->io_count == -1) { fprintf (tty_fp, "\n"); perror ("read: "); pattern_err = 11; break; } } while (*s->pattern != '\n'); if (!pattern_err) { fprintf (tty_fp, "\n"); fprintf (stderr, "Pattern is too long\n(maximum length is %d;" " you could redefine PATTERN_MAX and recompile)\n", PATTERN_MAX); pattern_err = 12; } } if (tcsetattr (fileno (tty_fp), TCSAFLUSH, &term_save)) { perror ("(2nd) tcsetattr: "); exit (pattern_err ? pattern_err : 13); } if (pattern_err) { exit (pattern_err); } } void parse_pattern (struct secrets *s) { for (s->i = s->a = s->is_alt = s->error = 0; s->pattern[s->i] && !s->error; ++s->i) { switch (s->pattern[s->i]) { case '\\': ++s->i; if (!s->pattern[s->i]) { s->error = 1; } break; case '(': if (s->is_alt) { s->error = 1; } else { s->is_alt = 1; s->alternatives[s->a] = 0; } break; case '|': if (!s->is_alt) { s->error = 1; } else { ++s->alternatives[s->a]; } break; case ')': if (!s->is_alt) { s->error = 1; } else { s->is_alt = 0; ++s->a; } break; } } if (s->error || s->is_alt) { fprintf (stderr, "Pattern is malformed\n"); exit (14); } for (s->b = 0; s->b < s->a; ++s->b ) { s->try[s->b] = 0; } } void spawn_gpg (const char *key, int dev_null, int *pass_writer, pid_t *kid) { int pass_fds[2]; char s_pass_reader[21]; if (pipe (pass_fds)) { perror ("pipe: "); exit (16); } *pass_writer = pass_fds[1]; snprintf (s_pass_reader, sizeof (s_pass_reader), "%d", pass_fds[0]); if ((*kid = fork ()) == -1) { perror ("fork: "); exit (17); } if (!*kid) { if (close (pass_fds[1])) { perror ("(kid) close: "); exit (18); } if (dup2 (dev_null, 0) == -1 || dup2 (dev_null, 1) == -1 || dup2 (dev_null, 2) == -1) { perror ("(kid) dup2: "); exit (19); } execl (GPG, "gpg", "--default-key", key, "--passphrase-fd", s_pass_reader, "--batch", "--dry-run", "--clearsign", "/dev/null", NULL); perror ("(kid) execlp: "); exit (20); } if (close (pass_fds[0])) { perror ("(parent) close: "); exit (21); } } void write_passphrase (struct secrets *s, int pass_writer) { for (s->i = s->b = 0; s->pattern[s->i]; ++s->i) { switch (s->pattern[s->i]) { case '\\': ++s->i; s->is_literal = 1; break; case '(': s->is_alt = 1; s->alt_n = 0; s->is_literal = 0; break; case '|': ++s->alt_n; s->is_literal = 0; break; case ')': s->is_alt = 0; ++s->b; s->is_literal = 0; break; default: s->is_literal = 1; break; } if (s->is_literal && (!s->is_alt || s->alt_n == s->try[s->b])) { while (!(s->io_count = write (pass_writer, s->pattern + s->i, 1))) { sleep (1); } if (s->io_count == -1) { perror ("write: "); exit (22); } } } while (!(s->io_count = write (pass_writer, &LF, 1))) { sleep (1); } if (s->io_count == -1) { perror ("(last) write: "); exit (23); } if (close (pass_writer)) { perror ("(final) close: "); exit (24); } } int passphrase_is_correct (const char *key, struct secrets *s, int dev_null) { int pass_writer; pid_t kid; int status; spawn_gpg (key, dev_null, &pass_writer, &kid); write_passphrase (s, pass_writer); if (waitpid (kid, &status, 0) == -1) { perror ("waitpid: "); exit (25); } if (!WIFEXITED (status)) { fprintf (stderr, "gpg didn't exit normally"); exit (26); } return (WEXITSTATUS (status) == 0); } int find_passphrase (const char *key, struct secrets *s) { int dev_null; if ((dev_null = open ("/dev/null", O_RDWR)) == -1) { perror ("open: "); exit (15); } do { if (passphrase_is_correct (key, s, dev_null)) { fprintf (stderr, "Passphrase found\n"); for (s->b = 0; s->b < s->a; ++s->b) { printf (s->b ? " %d" : "%d", s->try[s->b] + 1); } printf ("\n"); return (0); } s->error = 1; for (s->b = s->a - 1; s->b >= 0; --s->b) { if (s->try[s->b] < s->alternatives[s->b]) { ++s->try[s->b]; for (s->i = s->b + 1; s->i < s->a; ++s->i) { s->try[s->i] = 0; } s->error = 0; break; } } } while (!s->error); fprintf (stderr, "Passphrase doesn't match pattern (or no such key)\n"); return (1); } int main (int argc, char **argv) { struct secrets sec; struct stat stat_buf; fprintf (stderr, "%s (Rephrase) %s\nCopyright (C) 2003 Phil Lanch\n" "This program comes with ABSOLUTELY NO WARRANTY.\n" "This is free software, and you are welcome to redistribute it\n" "under certain conditions. See the file COPYING for details.\n\n", PROGRAM, VERSION); if (mlock (&sec, sizeof (struct secrets))) { perror ("mlock: "); fprintf (stderr, "(%s should be installed setuid root)\n", PROGRAM); exit (2); } if (setreuid (getuid (), getuid ())) { perror ("setreuid: "); exit (3); } if (stat (GPG, &stat_buf)) { if (errno & (ENOENT | ENOTDIR)) { fprintf (stderr, "%s does not exist (or is in a directory I cannot read)" "\n(perhaps you need to redefine GPG and recompile)\n", GPG); exit (4); } perror ("stat: "); exit (5); } if (!S_ISREG(stat_buf.st_mode) || !(stat_buf.st_mode & (stat_buf.st_uid == getuid () ? S_IXUSR : stat_buf.st_gid == getgid () ? S_IXGRP : S_IXOTH))) { fprintf (stderr, "%s is not an executable (by me) file\n", GPG); exit (6); } if (argc != 2) { fprintf (stderr, "Usage: %s \n", PROGRAM); exit (7); } read_pattern (&sec); parse_pattern (&sec); return (find_passphrase (argv[1], &sec)); }