Mercurial > dropbear
annotate libtomcrypt/src/mac/xcbc/xcbc_init.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> |
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date | Mon, 09 Jul 2018 16:27:53 +0200 |
parents | 6dba84798cd5 |
children |
rev | line source |
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382
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 */ |
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9 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file xcbc_init.c |
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13 XCBC Support, start an XCBC state |
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14 */ |
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15 |
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16 #ifdef LTC_XCBC |
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17 |
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18 /** Initialize XCBC-MAC state |
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19 @param xcbc [out] XCBC state to initialize |
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20 @param cipher Index of cipher to use |
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21 @param key [in] Secret key |
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22 @param keylen Length of secret key in octets |
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23 Return CRYPT_OK on success |
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24 */ |
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25 int xcbc_init(xcbc_state *xcbc, int cipher, const unsigned char *key, unsigned long keylen) |
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26 { |
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27 int x, y, err; |
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28 symmetric_key *skey; |
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29 unsigned long k1; |
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30 |
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31 LTC_ARGCHK(xcbc != NULL); |
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32 LTC_ARGCHK(key != NULL); |
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33 |
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34 /* schedule the key */ |
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35 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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36 return err; |
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37 } |
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38 |
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39 #ifdef LTC_FAST |
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40 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) { |
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41 return CRYPT_INVALID_ARG; |
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42 } |
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43 #endif |
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44 |
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45 skey = NULL; |
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46 |
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47 /* are we in pure XCBC mode with three keys? */ |
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48 if (keylen & LTC_XCBC_PURE) { |
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49 keylen &= ~LTC_XCBC_PURE; |
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50 |
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51 if (keylen < 2UL*cipher_descriptor[cipher].block_length) { |
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52 return CRYPT_INVALID_ARG; |
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53 } |
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54 |
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55 k1 = keylen - 2*cipher_descriptor[cipher].block_length; |
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56 XMEMCPY(xcbc->K[0], key, k1); |
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57 XMEMCPY(xcbc->K[1], key+k1, cipher_descriptor[cipher].block_length); |
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58 XMEMCPY(xcbc->K[2], key+k1 + cipher_descriptor[cipher].block_length, cipher_descriptor[cipher].block_length); |
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59 } else { |
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60 /* use the key expansion */ |
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61 k1 = cipher_descriptor[cipher].block_length; |
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62 |
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63 /* schedule the user key */ |
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64 skey = XCALLOC(1, sizeof(*skey)); |
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65 if (skey == NULL) { |
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66 return CRYPT_MEM; |
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67 } |
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68 |
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69 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, skey)) != CRYPT_OK) { |
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70 goto done; |
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71 } |
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72 |
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73 /* make the three keys */ |
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74 for (y = 0; y < 3; y++) { |
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75 for (x = 0; x < cipher_descriptor[cipher].block_length; x++) { |
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76 xcbc->K[y][x] = y + 1; |
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77 } |
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78 cipher_descriptor[cipher].ecb_encrypt(xcbc->K[y], xcbc->K[y], skey); |
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79 } |
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80 } |
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81 |
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82 /* setup K1 */ |
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83 err = cipher_descriptor[cipher].setup(xcbc->K[0], k1, 0, &xcbc->key); |
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84 |
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85 /* setup struct */ |
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86 zeromem(xcbc->IV, cipher_descriptor[cipher].block_length); |
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87 xcbc->blocksize = cipher_descriptor[cipher].block_length; |
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88 xcbc->cipher = cipher; |
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89 xcbc->buflen = 0; |
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90 done: |
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91 cipher_descriptor[cipher].done(skey); |
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92 if (skey != NULL) { |
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93 #ifdef LTC_CLEAN_STACK |
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94 zeromem(skey, sizeof(*skey)); |
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95 #endif |
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96 XFREE(skey); |
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97 } |
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98 return err; |
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99 } |
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100 |
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101 #endif |
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102 |
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103 /* ref: $Format:%D$ */ |
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104 /* git commit: $Format:%H$ */ |
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105 /* commit time: $Format:%ai$ */ |
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106 |