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annotate libtomcrypt/src/encauth/ocb3/ocb3_decrypt_verify_memory.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 6dba84798cd5
children
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rev   line source
1471
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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
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10 /**
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11 @file ocb3_decrypt_verify_memory.c
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12 OCB implementation, helper to decrypt block of memory, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
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16 #ifdef LTC_OCB3_MODE
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17
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18 /**
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19 Decrypt and compare the tag with OCB
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20 @param cipher The index of the cipher desired
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21 @param key The secret key
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22 @param keylen The length of the secret key (octets)
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23 @param nonce The session nonce (length of the block size of the block cipher)
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24 @param noncelen The length of the nonce (octets)
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25 @param adata The AAD - additional associated data
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26 @param adatalen The length of AAD (octets)
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27 @param ct The ciphertext
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28 @param ctlen The length of the ciphertext (octets)
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29 @param pt [out] The plaintext
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30 @param tag The tag to compare against
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31 @param taglen The length of the tag (octets)
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32 @param stat [out] The result of the tag comparison (1==valid, 0==invalid)
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33 @return CRYPT_OK if successful regardless of the tag comparison
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34 */
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35 int ocb3_decrypt_verify_memory(int cipher,
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36 const unsigned char *key, unsigned long keylen,
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37 const unsigned char *nonce, unsigned long noncelen,
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38 const unsigned char *adata, unsigned long adatalen,
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39 const unsigned char *ct, unsigned long ctlen,
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40 unsigned char *pt,
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41 const unsigned char *tag, unsigned long taglen,
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42 int *stat)
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43 {
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44 int err;
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45 ocb3_state *ocb;
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46 unsigned char *buf;
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47 unsigned long buflen;
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48
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49 LTC_ARGCHK(stat != NULL);
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50
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51 /* default to zero */
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52 *stat = 0;
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53
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54 /* limit taglen */
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55 taglen = MIN(taglen, MAXBLOCKSIZE);
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56
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57 /* allocate memory */
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58 buf = XMALLOC(taglen);
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59 ocb = XMALLOC(sizeof(ocb3_state));
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60 if (ocb == NULL || buf == NULL) {
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61 if (ocb != NULL) {
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62 XFREE(ocb);
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63 }
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64 if (buf != NULL) {
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65 XFREE(buf);
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66 }
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67 return CRYPT_MEM;
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68 }
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69
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70 if ((err = ocb3_init(ocb, cipher, key, keylen, nonce, noncelen, taglen)) != CRYPT_OK) {
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71 goto LBL_ERR;
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72 }
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73
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74 if (adata != NULL || adatalen != 0) {
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75 if ((err = ocb3_add_aad(ocb, adata, adatalen)) != CRYPT_OK) {
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76 goto LBL_ERR;
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77 }
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78 }
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79
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80 if ((err = ocb3_decrypt_last(ocb, ct, ctlen, pt)) != CRYPT_OK) {
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81 goto LBL_ERR;
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82 }
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83
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84 buflen = taglen;
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85 if ((err = ocb3_done(ocb, buf, &buflen)) != CRYPT_OK) {
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86 goto LBL_ERR;
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87 }
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88
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89 /* compare tags */
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90 if (buflen >= taglen && XMEM_NEQ(buf, tag, taglen) == 0) {
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91 *stat = 1;
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92 }
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93
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94 err = CRYPT_OK;
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95
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96 LBL_ERR:
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97 #ifdef LTC_CLEAN_STACK
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98 zeromem(ocb, sizeof(ocb3_state));
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99 #endif
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100
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101 XFREE(ocb);
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102 XFREE(buf);
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103 return err;
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104 }
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105
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106 #endif
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107
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108 /* ref: $Format:%D$ */
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109 /* git commit: $Format:%H$ */
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110 /* commit time: $Format:%ai$ */