mirror of
git://git.gnupg.org/gnupg.git
synced 2024-12-22 10:19:57 +01:00
096e7457ec
The asymmetric quotes used by GNU in the past (`...') don't render
nicely on modern systems. We now use two \x27 characters ('...').
The proper solution would be to use the correct Unicode symmetric
quotes here. However this has the disadvantage that the system
requires Unicode support. We don't want that today. If Unicode is
available a generated po file can be used to output proper quotes. A
simple sed script like the one used for en@quote is sufficient to
change them.
The changes have been done by applying
sed -i "s/\`\([^'\`]*\)'/'\1'/g"
to most files and fixing obvious problems by hand. The msgid strings in
the po files were fixed with a similar command.
505 lines
12 KiB
C
505 lines
12 KiB
C
/* gpg-check-pattern.c - A tool to check passphrases against pattern.
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* Copyright (C) 2007 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#ifdef HAVE_LOCALE_H
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# include <locale.h>
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#endif
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#ifdef HAVE_LANGINFO_CODESET
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# include <langinfo.h>
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#endif
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#ifdef HAVE_DOSISH_SYSTEM
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# include <fcntl.h> /* for setmode() */
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#endif
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <regex.h>
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#include <ctype.h>
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#define JNLIB_NEED_LOG_LOGV
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#include "util.h"
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#include "i18n.h"
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#include "sysutils.h"
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#include "../common/init.h"
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enum cmd_and_opt_values
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{ aNull = 0,
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oVerbose = 'v',
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oArmor = 'a',
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oPassphrase = 'P',
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oProtect = 'p',
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oUnprotect = 'u',
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oNull = '0',
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oNoVerbose = 500,
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oCheck,
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oHomedir
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};
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/* The list of commands and options. */
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static ARGPARSE_OPTS opts[] = {
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{ 301, NULL, 0, N_("@Options:\n ") },
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{ oVerbose, "verbose", 0, "verbose" },
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{ oHomedir, "homedir", 2, "@" },
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{ oCheck, "check", 0, "run only a syntax check on the patternfile" },
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{ oNull, "null", 0, "input is expected to be null delimited" },
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{0}
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};
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/* Global options are accessed through the usual OPT structure. */
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static struct
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{
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int verbose;
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const char *homedir;
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int checkonly;
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int null;
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} opt;
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enum {
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PAT_NULL, /* Indicates end of the array. */
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PAT_STRING, /* The pattern is a simple string. */
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PAT_REGEX /* The pattern is an extended regualr expression. */
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};
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/* An object to decibe an item of our pattern table. */
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struct pattern_s
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{
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int type;
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unsigned int lineno; /* Line number of the pattern file. */
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union {
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struct {
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const char *string; /* Pointer to the actual string (nul termnated). */
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size_t length; /* The length of this string (strlen). */
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} s; /*PAT_STRING*/
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struct {
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/* We allocate the regex_t because this type is larger than what
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we need for PAT_STRING and we expect only a few regex in a
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patternfile. It would be a waste of core to have so many
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unused stuff in the table. */
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regex_t *regex;
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} r; /*PAT_REGEX*/
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} u;
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};
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typedef struct pattern_s pattern_t;
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/*** Local prototypes ***/
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static char *read_file (const char *fname, size_t *r_length);
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static pattern_t *parse_pattern_file (char *data, size_t datalen);
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static void process (FILE *fp, pattern_t *patarray);
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/* Info function for usage(). */
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static const char *
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my_strusage (int level)
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{
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const char *p;
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switch (level)
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{
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case 11: p = "gpg-check-pattern (GnuPG)";
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break;
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case 13: p = VERSION; break;
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case 17: p = PRINTABLE_OS_NAME; break;
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case 19: p = _("Please report bugs to <@EMAIL@>.\n"); break;
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case 1:
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case 40:
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p = _("Usage: gpg-check-pattern [options] patternfile (-h for help)\n");
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break;
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case 41:
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p = _("Syntax: gpg-check-pattern [options] patternfile\n"
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"Check a passphrase given on stdin against the patternfile\n");
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break;
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default: p = NULL;
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}
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return p;
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}
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int
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main (int argc, char **argv )
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{
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ARGPARSE_ARGS pargs;
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char *raw_pattern;
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size_t raw_pattern_length;
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pattern_t *patternarray;
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set_strusage (my_strusage);
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gcry_control (GCRYCTL_SUSPEND_SECMEM_WARN);
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log_set_prefix ("gpg-check-pattern", 1);
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/* Make sure that our subsystems are ready. */
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i18n_init ();
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init_common_subsystems (&argc, &argv);
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/* We need Libgcrypt for hashing. */
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if (!gcry_check_version (NEED_LIBGCRYPT_VERSION) )
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{
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log_fatal ( _("%s is too old (need %s, have %s)\n"), "libgcrypt",
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NEED_LIBGCRYPT_VERSION, gcry_check_version (NULL) );
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}
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setup_libgcrypt_logging ();
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gcry_control (GCRYCTL_INIT_SECMEM, 4096, 0);
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opt.homedir = default_homedir ();
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pargs.argc = &argc;
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pargs.argv = &argv;
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pargs.flags= 1; /* (do not remove the args) */
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while (arg_parse (&pargs, opts) )
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{
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switch (pargs.r_opt)
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{
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case oVerbose: opt.verbose++; break;
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case oHomedir: opt.homedir = pargs.r.ret_str; break;
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case oCheck: opt.checkonly = 1; break;
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case oNull: opt.null = 1; break;
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default : pargs.err = 2; break;
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}
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}
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if (log_get_errorcount(0))
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exit (2);
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if (argc != 1)
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usage (1);
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/* We read the entire pattern file into our memory and parse it
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using a separate function. This allows us to eventual do the
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reading while running setuid so that the pattern file can be
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hidden from regular users. I am not sure whether this makes
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sense, but lets be prepared for it. */
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raw_pattern = read_file (*argv, &raw_pattern_length);
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if (!raw_pattern)
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exit (2);
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patternarray = parse_pattern_file (raw_pattern, raw_pattern_length);
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if (!patternarray)
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exit (1);
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if (opt.checkonly)
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return 0;
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#ifdef HAVE_DOSISH_SYSTEM
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setmode (fileno (stdin) , O_BINARY );
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#endif
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process (stdin, patternarray);
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return log_get_errorcount(0)? 1 : 0;
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}
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/* Read a file FNAME into a buffer and return that malloced buffer.
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Caller must free the buffer. On error NULL is returned, on success
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the valid length of the buffer is stored at R_LENGTH. The returned
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buffer is guarnteed to be nul terminated. */
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static char *
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read_file (const char *fname, size_t *r_length)
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{
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FILE *fp;
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char *buf;
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size_t buflen;
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if (!strcmp (fname, "-"))
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{
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size_t nread, bufsize = 0;
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fp = stdin;
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#ifdef HAVE_DOSISH_SYSTEM
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setmode ( fileno(fp) , O_BINARY );
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#endif
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buf = NULL;
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buflen = 0;
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#define NCHUNK 8192
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do
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{
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bufsize += NCHUNK;
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if (!buf)
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buf = xmalloc (bufsize+1);
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else
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buf = xrealloc (buf, bufsize+1);
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nread = fread (buf+buflen, 1, NCHUNK, fp);
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if (nread < NCHUNK && ferror (fp))
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{
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log_error ("error reading '[stdin]': %s\n", strerror (errno));
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xfree (buf);
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return NULL;
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}
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buflen += nread;
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}
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while (nread == NCHUNK);
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#undef NCHUNK
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}
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else
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{
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struct stat st;
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fp = fopen (fname, "rb");
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if (!fp)
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{
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log_error ("can't open '%s': %s\n", fname, strerror (errno));
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return NULL;
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}
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if (fstat (fileno(fp), &st))
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{
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log_error ("can't stat '%s': %s\n", fname, strerror (errno));
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fclose (fp);
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return NULL;
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}
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buflen = st.st_size;
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buf = xmalloc (buflen+1);
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if (fread (buf, buflen, 1, fp) != 1)
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{
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log_error ("error reading '%s': %s\n", fname, strerror (errno));
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fclose (fp);
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xfree (buf);
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return NULL;
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}
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fclose (fp);
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}
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buf[buflen] = 0;
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*r_length = buflen;
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return buf;
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}
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static char *
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get_regerror (int errcode, regex_t *compiled)
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{
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size_t length = regerror (errcode, compiled, NULL, 0);
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char *buffer = xmalloc (length);
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regerror (errcode, compiled, buffer, length);
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return buffer;
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}
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/* Parse the pattern given in the memory aread DATA/DATALEN and return
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a new pattern array. The end of the array is indicated by a NULL
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entry. On error an error message is printed and the fucntion
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returns NULL. Note that the function modifies DATA and assumes
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that data is nul terminated (even if this is one byte past
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DATALEN). */
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static pattern_t *
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parse_pattern_file (char *data, size_t datalen)
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{
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char *p, *p2;
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size_t n;
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pattern_t *array;
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size_t arraysize, arrayidx;
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unsigned int lineno = 0;
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/* Estimate the number of entries by counting the non-comment lines. */
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arraysize = 0;
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p = data;
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for (n = datalen; n && (p2 = memchr (p, '\n', n)); p2++, n -= p2 - p, p = p2)
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if (*p != '#')
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arraysize++;
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arraysize += 2; /* For the terminating NULL and a last line w/o a LF. */
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array = xcalloc (arraysize, sizeof *array);
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arrayidx = 0;
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/* Loop over all lines. */
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while (datalen && data)
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{
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lineno++;
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p = data;
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p2 = data = memchr (p, '\n', datalen);
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if (p2)
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{
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*data++ = 0;
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datalen -= data - p;
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}
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else
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p2 = p + datalen;
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assert (!*p2);
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p2--;
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while (isascii (*p) && isspace (*p))
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p++;
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if (*p == '#')
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continue;
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while (p2 > p && isascii (*p2) && isspace (*p2))
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*p2-- = 0;
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if (!*p)
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continue;
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assert (arrayidx < arraysize);
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array[arrayidx].lineno = lineno;
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if (*p == '/')
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{
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int rerr;
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p++;
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array[arrayidx].type = PAT_REGEX;
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if (*p && p[strlen(p)-1] == '/')
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p[strlen(p)-1] = 0; /* Remove optional delimiter. */
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array[arrayidx].u.r.regex = xcalloc (1, sizeof (regex_t));
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rerr = regcomp (array[arrayidx].u.r.regex, p,
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REG_ICASE|REG_NOSUB|REG_EXTENDED);
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if (rerr)
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{
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char *rerrbuf = get_regerror (rerr, array[arrayidx].u.r.regex);
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log_error ("invalid r.e. at line %u: %s\n", lineno, rerrbuf);
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xfree (rerrbuf);
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if (!opt.checkonly)
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exit (1);
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}
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}
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else
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{
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array[arrayidx].type = PAT_STRING;
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array[arrayidx].u.s.string = p;
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array[arrayidx].u.s.length = strlen (p);
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}
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arrayidx++;
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}
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assert (arrayidx < arraysize);
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array[arrayidx].type = PAT_NULL;
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return array;
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}
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/* Check whether string macthes any of the pattern in PATARRAY and
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returns the matching pattern item or NULL. */
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static pattern_t *
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match_p (const char *string, pattern_t *patarray)
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{
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pattern_t *pat;
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if (!*string)
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{
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if (opt.verbose)
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log_info ("zero length input line - ignored\n");
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return NULL;
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}
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for (pat = patarray; pat->type != PAT_NULL; pat++)
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{
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if (pat->type == PAT_STRING)
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{
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if (!strcasecmp (pat->u.s.string, string))
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return pat;
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}
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else if (pat->type == PAT_REGEX)
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{
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int rerr;
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rerr = regexec (pat->u.r.regex, string, 0, NULL, 0);
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if (!rerr)
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return pat;
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else if (rerr != REG_NOMATCH)
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{
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char *rerrbuf = get_regerror (rerr, pat->u.r.regex);
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log_error ("matching r.e. failed: %s\n", rerrbuf);
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xfree (rerrbuf);
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return pat; /* Better indicate a match on error. */
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}
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}
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else
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BUG ();
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}
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return NULL;
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}
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/* Actual processing of the input. This fucntion does not return an
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error code but exits as soon as a match has been found. */
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static void
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process (FILE *fp, pattern_t *patarray)
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{
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char buffer[2048];
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size_t idx;
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int c;
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unsigned long lineno = 0;
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pattern_t *pat;
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idx = 0;
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c = 0;
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while (idx < sizeof buffer -1 && c != EOF )
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{
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if ((c = getc (fp)) != EOF)
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buffer[idx] = c;
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if ((c == '\n' && !opt.null) || (!c && opt.null) || c == EOF)
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{
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lineno++;
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if (!opt.null)
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{
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while (idx && isascii (buffer[idx-1]) && isspace (buffer[idx-1]))
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idx--;
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}
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buffer[idx] = 0;
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pat = match_p (buffer, patarray);
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if (pat)
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{
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if (opt.verbose)
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log_error ("input line %lu matches pattern at line %u"
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" - rejected\n",
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lineno, pat->lineno);
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exit (1);
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}
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idx = 0;
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}
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else
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idx++;
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}
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if (c != EOF)
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{
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log_error ("input line %lu too long - rejected\n", lineno+1);
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exit (1);
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}
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if (ferror (fp))
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{
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log_error ("input read error at line %lu: %s - rejected\n",
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lineno+1, strerror (errno));
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exit (1);
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}
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if (opt.verbose)
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log_info ("no input line matches the pattern - accepted\n");
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}
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