view libtomcrypt/src/modes/f8/f8_test_mode.c @ 1930:299f4f19ba19

Add /usr/sbin and /sbin to default root PATH When dropbear is used in a very restricted environment (such as in a initrd), the default user shell is often also very restricted and doesn't take care of setting the PATH so the user ends up with the PATH set by dropbear. Unfortunately, dropbear always sets "/usr/bin:/bin" as default PATH even for the root user which should have /usr/sbin and /sbin too. For a concrete instance of this problem, see the "Remote Unlocking" section in this tutorial: https://paxswill.com/blog/2013/11/04/encrypted-raspberry-pi/ It speaks of a bug in the initramfs script because it's written "blkid" instead of "/sbin/blkid"... this is just because the scripts from the initramfs do not expect to have a PATH without the sbin directories and because dropbear is not setting the PATH appropriately for the root user. I'm thus suggesting to use the attached patch to fix this misbehaviour (I did not test it, but it's easy enough). It might seem anecdotic but multiple Kali users have been bitten by this. From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903403
author Raphael Hertzog <hertzog@debian.org>
date Mon, 09 Jul 2018 16:27:53 +0200
parents 6dba84798cd5
children
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 */
#include "tomcrypt.h"

/**
   @file f8_test_mode.c
   F8 implementation, test, Tom St Denis
*/


#ifdef LTC_F8_MODE

int f8_test_mode(void)
{
#ifndef LTC_TEST
   return CRYPT_NOP;
#else
   static const unsigned char key[16] = { 0x23, 0x48, 0x29, 0x00, 0x84, 0x67, 0xbe, 0x18,
                                          0x6c, 0x3d, 0xe1, 0x4a, 0xae, 0x72, 0xd6, 0x2c };
   static const unsigned char salt[4] = { 0x32, 0xf2, 0x87, 0x0d };
   static const unsigned char IV[16]  = { 0x00, 0x6e, 0x5c, 0xba, 0x50, 0x68, 0x1d, 0xe5,
                                          0x5c, 0x62, 0x15, 0x99, 0xd4, 0x62, 0x56, 0x4a };
   static const unsigned char pt[39]  = { 0x70, 0x73, 0x65, 0x75, 0x64, 0x6f, 0x72, 0x61,
                                          0x6e, 0x64, 0x6f, 0x6d, 0x6e, 0x65, 0x73, 0x73,
                                          0x20, 0x69, 0x73, 0x20, 0x74, 0x68, 0x65, 0x20,
                                          0x6e, 0x65, 0x78, 0x74, 0x20, 0x62, 0x65, 0x73,
                                          0x74, 0x20, 0x74, 0x68, 0x69, 0x6e, 0x67       };
   static const unsigned char ct[39]  = { 0x01, 0x9c, 0xe7, 0xa2, 0x6e, 0x78, 0x54, 0x01,
                                          0x4a, 0x63, 0x66, 0xaa, 0x95, 0xd4, 0xee, 0xfd,
                                          0x1a, 0xd4, 0x17, 0x2a, 0x14, 0xf9, 0xfa, 0xf4,
                                          0x55, 0xb7, 0xf1, 0xd4, 0xb6, 0x2b, 0xd0, 0x8f,
                                          0x56, 0x2c, 0x0e, 0xef, 0x7c, 0x48, 0x02       };
   unsigned char buf[39];
   symmetric_F8  f8;
   int           err, idx;

   idx = find_cipher("aes");
   if (idx == -1) {
      idx = find_cipher("rijndael");
      if (idx == -1) return CRYPT_NOP;
   }

   /* initialize the context */
   if ((err = f8_start(idx, IV, key, sizeof(key), salt, sizeof(salt), 0, &f8)) != CRYPT_OK) {
      return err;
   }

   /* encrypt block */
   if ((err = f8_encrypt(pt, buf, sizeof(pt), &f8)) != CRYPT_OK) {
      f8_done(&f8);
      return err;
   }
   f8_done(&f8);

   /* compare */
   if (compare_testvector(buf, sizeof(ct), ct, sizeof(ct), "f8", 0)) {
      return CRYPT_FAIL_TESTVECTOR;
   }

   return CRYPT_OK;
#endif
}

#endif

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