crypt/badsalttest.c

   1 /* Test program for bad DES salt detection in crypt.
   2    Copyright (C) 2012-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <stdio.h>
  20 #include <unistd.h>
  21 #include <sys/mman.h>
  22 #include <crypt.h>
  23
  24 static const char *tests[][2] =
  25   {
  26     { "no salt", "" },
  27     { "single char", "/" },
  28     { "first char bad", "!x" },
  29     { "second char bad", "Z%" },
  30     { "both chars bad", ":@" },
  31     { "un$upported algorithm", "$2$" },
  32     { "unsupported_algorithm", "_1" },
  33     { "end of page", NULL }
  34   };
  35
  36 static int
  37 do_test (void)
  38 {
  39   int result = 0;
  40   struct crypt_data cd;
  41   size_t n = sizeof (tests) / sizeof (*tests);
  42   size_t pagesize = (size_t) sysconf (_SC_PAGESIZE);
  43   char *page;
  44
  45   /* Check that crypt won't look at the second character if the first
  46      one is invalid.  */
  47   page = mmap (NULL, pagesize * 2, PROT_READ | PROT_WRITE,
  48                MAP_PRIVATE | MAP_ANON, -1, 0);
  49   if (page == MAP_FAILED)
  50     {
  51       perror ("mmap");
  52       n--;
  53     }
  54   else
  55     {
  56       if (mmap (page + pagesize, pagesize, 0,
  57                 MAP_PRIVATE | MAP_ANON | MAP_FIXED,
  58                 -1, 0) != page + pagesize)
  59         perror ("mmap 2");
  60       page[pagesize - 1] = '*';
  61       tests[n - 1][1] = &page[pagesize - 1];
  62     }
  63
  64   for (size_t i = 0; i < n; i++)
  65     {
  66       if (crypt (tests[i][0], tests[i][1]))
  67         {
  68           result++;
  69           printf ("%s: crypt returned non-NULL with salt \"%s\"\n",
  70                   tests[i][0], tests[i][1]);
  71         }
  72
  73       if (crypt_r (tests[i][0], tests[i][1], &cd))
  74         {
  75           result++;
  76           printf ("%s: crypt_r returned non-NULL with salt \"%s\"\n",
  77                   tests[i][0], tests[i][1]);
  78         }
  79     }
  80
  81   return result;
  82 }
  83
  84 #define TIMEOUT 5
  85 #define TEST_FUNCTION do_test ()
  86 #include "../test-skeleton.c"