Mercurial > dropbear

view libtomcrypt/src/encauth/ccm/ccm_test.c @ 1930:299f4f19ba19

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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
line wrap: on
line source

/* 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 ccm_test.c
  CCM support, process a block of memory, Tom St Denis
*/

#ifdef LTC_CCM_MODE

int ccm_test(void)
{
#ifndef LTC_TEST
   return CRYPT_NOP;
#else
   static const struct {
       unsigned char key[16];
       unsigned char nonce[16];
       int           noncelen;
       unsigned char header[64];
       int           headerlen;
       unsigned char pt[64];
       int           ptlen;
       unsigned char ct[64];
       unsigned char tag[16];
       unsigned long taglen;
   } tests[] = {

/* 13 byte nonce, 8 byte auth, 23 byte pt */
{
   { 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
     0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF },
   { 0x00, 0x00, 0x00, 0x03, 0x02, 0x01, 0x00, 0xA0,
     0xA1, 0xA2, 0xA3, 0xA4, 0xA5 },
   13,
   { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 },
   8,
   { 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
     0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
     0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E },
   23,
   { 0x58, 0x8C, 0x97, 0x9A, 0x61, 0xC6, 0x63, 0xD2,
     0xF0, 0x66, 0xD0, 0xC2, 0xC0, 0xF9, 0x89, 0x80,
     0x6D, 0x5F, 0x6B, 0x61, 0xDA, 0xC3, 0x84 },
   { 0x17, 0xe8, 0xd1, 0x2c, 0xfd, 0xf9, 0x26, 0xe0 },
   8
},

/* 13 byte nonce, 12 byte header, 19 byte pt */
{
   { 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
     0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF },
   { 0x00, 0x00, 0x00, 0x06, 0x05, 0x04, 0x03, 0xA0,
     0xA1, 0xA2, 0xA3, 0xA4, 0xA5 },
   13,
   { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
     0x08, 0x09, 0x0A, 0x0B },
   12,
   { 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13,
     0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B,
     0x1C, 0x1D, 0x1E },
   19,
   { 0xA2, 0x8C, 0x68, 0x65, 0x93, 0x9A, 0x9A, 0x79,
     0xFA, 0xAA, 0x5C, 0x4C, 0x2A, 0x9D, 0x4A, 0x91,
     0xCD, 0xAC, 0x8C },
   { 0x96, 0xC8, 0x61, 0xB9, 0xC9, 0xE6, 0x1E, 0xF1 },
   8
},

/* supplied by Brian Gladman */
{
   { 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
     0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f },
   { 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16  },
   7,
   { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 },
   8,
   { 0x20, 0x21, 0x22, 0x23 },
   4,
   { 0x71, 0x62, 0x01, 0x5b },
   { 0x4d, 0xac, 0x25, 0x5d },
   4
},

{
   { 0xc9, 0x7c, 0x1f, 0x67, 0xce, 0x37, 0x11, 0x85,
     0x51, 0x4a, 0x8a, 0x19, 0xf2, 0xbd, 0xd5, 0x2f },
   { 0x00, 0x50, 0x30, 0xf1, 0x84, 0x44, 0x08, 0xb5,
     0x03, 0x97, 0x76, 0xe7, 0x0c },
   13,
   { 0x08, 0x40, 0x0f, 0xd2, 0xe1, 0x28, 0xa5, 0x7c,
     0x50, 0x30, 0xf1, 0x84, 0x44, 0x08, 0xab, 0xae,
     0xa5, 0xb8, 0xfc, 0xba, 0x00, 0x00 },
   22,
   { 0xf8, 0xba, 0x1a, 0x55, 0xd0, 0x2f, 0x85, 0xae,
     0x96, 0x7b, 0xb6, 0x2f, 0xb6, 0xcd, 0xa8, 0xeb,
     0x7e, 0x78, 0xa0, 0x50 },
   20,
   { 0xf3, 0xd0, 0xa2, 0xfe, 0x9a, 0x3d, 0xbf, 0x23,
     0x42, 0xa6, 0x43, 0xe4, 0x32, 0x46, 0xe8, 0x0c,
     0x3c, 0x04, 0xd0, 0x19 },
   { 0x78, 0x45, 0xce, 0x0b, 0x16, 0xf9, 0x76, 0x23 },
   8
},

};
  unsigned long taglen, x, y;
  unsigned char buf[64], buf2[64], tag[16], tag2[16], tag3[16], zero[64];
  int           err, idx;
  symmetric_key skey;
  ccm_state ccm;

  zeromem(zero, 64);

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

  for (x = 0; x < (sizeof(tests)/sizeof(tests[0])); x++) {
    for (y = 0; y < 2; y++) {
      taglen = tests[x].taglen;
      if (y == 0) {
         if ((err = cipher_descriptor[idx].setup(tests[x].key, 16, 0, &skey)) != CRYPT_OK) {
            return err;
         }

         if ((err = ccm_memory(idx,
                               tests[x].key, 16,
                               &skey,
                               tests[x].nonce, tests[x].noncelen,
                               tests[x].header, tests[x].headerlen,
                               (unsigned char*)tests[x].pt, tests[x].ptlen,
                               buf,
                               tag, &taglen, 0)) != CRYPT_OK) {
            return err;
         }
         /* run a second time to make sure skey is not touched */
         if ((err = ccm_memory(idx,
                               tests[x].key, 16,
                               &skey,
                               tests[x].nonce, tests[x].noncelen,
                               tests[x].header, tests[x].headerlen,
                               (unsigned char*)tests[x].pt, tests[x].ptlen,
                               buf,
                               tag, &taglen, 0)) != CRYPT_OK) {
            return err;
         }
      } else {
         if ((err = ccm_init(&ccm, idx, tests[x].key, 16, tests[x].ptlen, tests[x].taglen, tests[x].headerlen)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_add_nonce(&ccm, tests[x].nonce, tests[x].noncelen)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_add_aad(&ccm, tests[x].header, tests[x].headerlen)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_process(&ccm, (unsigned char*)tests[x].pt, tests[x].ptlen, buf, CCM_ENCRYPT)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_done(&ccm, tag, &taglen)) != CRYPT_OK) {
            return err;
         }
      }

      if (compare_testvector(buf, tests[x].ptlen, tests[x].ct, tests[x].ptlen, "CCM encrypt data", x)) {
         return CRYPT_FAIL_TESTVECTOR;
      }
      if (compare_testvector(tag, taglen, tests[x].tag, tests[x].taglen, "CCM encrypt tag", x)) {
         return CRYPT_FAIL_TESTVECTOR;
      }

      if (y == 0) {
         XMEMCPY(tag3, tests[x].tag, tests[x].taglen);
         taglen = tests[x].taglen;
         if ((err = ccm_memory(idx,
                               tests[x].key, 16,
                               NULL,
                               tests[x].nonce, tests[x].noncelen,
                               tests[x].header, tests[x].headerlen,
                               buf2, tests[x].ptlen,
                               buf,
                               tag3, &taglen, 1   )) != CRYPT_OK) {
            return err;
         }
      } else {
         if ((err = ccm_init(&ccm, idx, tests[x].key, 16, tests[x].ptlen, tests[x].taglen, tests[x].headerlen)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_add_nonce(&ccm, tests[x].nonce, tests[x].noncelen)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_add_aad(&ccm, tests[x].header, tests[x].headerlen)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_process(&ccm, buf2, tests[x].ptlen, buf, CCM_DECRYPT)) != CRYPT_OK) {
            return err;
         }
         if ((err = ccm_done(&ccm, tag2, &taglen)) != CRYPT_OK) {
            return err;
         }
      }


      if (compare_testvector(buf2, tests[x].ptlen, tests[x].pt, tests[x].ptlen, "CCM decrypt data", x)) {
         return CRYPT_FAIL_TESTVECTOR;
      }
      if (y == 0) {
        /* check if decryption with the wrong tag does not reveal the plaintext */
        XMEMCPY(tag3, tests[x].tag, tests[x].taglen);
        tag3[0] ^= 0xff; /* set the tag to the wrong value */
        taglen = tests[x].taglen;
        if ((err = ccm_memory(idx,
                              tests[x].key, 16,
                              NULL,
                              tests[x].nonce, tests[x].noncelen,
                              tests[x].header, tests[x].headerlen,
                              buf2, tests[x].ptlen,
                              buf,
                              tag3, &taglen, 1   )) != CRYPT_ERROR) {
          return CRYPT_FAIL_TESTVECTOR;
        }
        if (compare_testvector(buf2, tests[x].ptlen, zero, tests[x].ptlen, "CCM decrypt wrong tag", x)) {
           return CRYPT_FAIL_TESTVECTOR;
        }
      } else {
        if (compare_testvector(tag2, taglen, tests[x].tag, tests[x].taglen, "CCM decrypt tag", x)) {
           return CRYPT_FAIL_TESTVECTOR;
        }
      }

      if (y == 0) {
         cipher_descriptor[idx].done(&skey);
      }
    }
  }

  return CRYPT_OK;
#endif
}

#endif

/* ref:         $Format:%D$ */
/* git commit:  $Format:%H$ */
/* commit time: $Format:%ai$ */