Mercurial > dropbear

annotate libtomcrypt/src/mac/hmac/hmac_init.c @ 1930:299f4f19ba19

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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 1ff2a1034c52
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 hmac_init.c
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13 HMAC support, initialize state, Tom St Denis/Dobes Vandermeer
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14 */
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15
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16 #ifdef LTC_HMAC
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17
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18 #define LTC_HMAC_BLOCKSIZE hash_descriptor[hash].blocksize
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19
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20 /**
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21 Initialize an HMAC context.
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22 @param hmac The HMAC state
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23 @param hash The index of the hash you want to use
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24 @param key The secret key
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25 @param keylen The length of the secret key (octets)
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26 @return CRYPT_OK if successful
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27 */
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28 int hmac_init(hmac_state *hmac, int hash, const unsigned char *key, unsigned long keylen)
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29 {
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30 unsigned char buf[MAXBLOCKSIZE];
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31 unsigned long hashsize;
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32 unsigned long i, z;
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33 int err;
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35 LTC_ARGCHK(hmac != NULL);
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36 LTC_ARGCHK(key != NULL);
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38 /* valid hash? */
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39 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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40 return err;
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41 }
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42 hmac->hash = hash;
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43 hashsize = hash_descriptor[hash].hashsize;
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45 /* valid key length? */
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46 if (keylen == 0) {
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47 return CRYPT_INVALID_KEYSIZE;
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48 }
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49
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50 /* allocate memory for key */
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51 hmac->key = XMALLOC(LTC_HMAC_BLOCKSIZE);
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52 if (hmac->key == NULL) {
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53 return CRYPT_MEM;
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54 }
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55
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56 /* (1) make sure we have a large enough key */
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57 if(keylen > LTC_HMAC_BLOCKSIZE) {
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58 z = LTC_HMAC_BLOCKSIZE;
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59 if ((err = hash_memory(hash, key, keylen, hmac->key, &z)) != CRYPT_OK) {
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60 goto LBL_ERR;
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61 }
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62 keylen = hashsize;
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63 } else {
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64 XMEMCPY(hmac->key, key, (size_t)keylen);
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65 }
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66
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67 if(keylen < LTC_HMAC_BLOCKSIZE) {
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68 zeromem((hmac->key) + keylen, (size_t)(LTC_HMAC_BLOCKSIZE - keylen));
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69 }
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70
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71 /* Create the initialization vector for step (3) */
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72 for(i=0; i < LTC_HMAC_BLOCKSIZE; i++) {
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73 buf[i] = hmac->key[i] ^ 0x36;
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74 }
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75
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76 /* Pre-pend that to the hash data */
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77 if ((err = hash_descriptor[hash].init(&hmac->md)) != CRYPT_OK) {
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78 goto LBL_ERR;
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79 }
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80
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81 if ((err = hash_descriptor[hash].process(&hmac->md, buf, LTC_HMAC_BLOCKSIZE)) != CRYPT_OK) {
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82 goto LBL_ERR;
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83 }
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84 goto done;
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85 LBL_ERR:
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86 /* free the key since we failed */
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87 XFREE(hmac->key);
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88 done:
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89 #ifdef LTC_CLEAN_STACK
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90 zeromem(buf, LTC_HMAC_BLOCKSIZE);
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91 #endif
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92
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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93 return err;
285
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94 }
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95
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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96 #endif
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97
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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98 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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99 /* git commit: $Format:%H$ */
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100 /* commit time: $Format:%ai$ */