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annotate libtomcrypt/src/encauth/ocb3/ocb3_done.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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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_done.c
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12 OCB implementation, INTERNAL ONLY helper, 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 Finish OCB processing and compute the tag
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20 @param ocb The OCB state
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21 @param tag [out] The destination for the authentication tag
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22 @param taglen [in/out] The max size and resulting size of the authentication tag
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23 @return CRYPT_OK if successful
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24 */
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25 int ocb3_done(ocb3_state *ocb, unsigned char *tag, unsigned long *taglen)
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26 {
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27 unsigned char tmp[MAXBLOCKSIZE];
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28 int err, x;
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29
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30 LTC_ARGCHK(ocb != NULL);
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31 LTC_ARGCHK(tag != NULL);
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32 LTC_ARGCHK(taglen != NULL);
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33 if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) {
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34 goto LBL_ERR;
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35 }
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36
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37 /* check taglen */
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38 if ((int)*taglen < ocb->tag_len) {
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39 *taglen = (unsigned long)ocb->tag_len;
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40 return CRYPT_BUFFER_OVERFLOW;
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41 }
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42
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43 /* finalize AAD processing */
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44
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45 if (ocb->adata_buffer_bytes>0) {
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46 /* Offset_* = Offset_m xor L_* */
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47 ocb3_int_xor_blocks(ocb->aOffset_current, ocb->aOffset_current, ocb->L_star, ocb->block_len);
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48
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49 /* CipherInput = (A_* || 1 || zeros(127-bitlen(A_*))) xor Offset_* */
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50 ocb3_int_xor_blocks(tmp, ocb->adata_buffer, ocb->aOffset_current, ocb->adata_buffer_bytes);
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51 for(x=ocb->adata_buffer_bytes; x<ocb->block_len; x++) {
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52 if (x == ocb->adata_buffer_bytes) {
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53 tmp[x] = 0x80 ^ ocb->aOffset_current[x];
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54 }
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55 else {
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56 tmp[x] = 0x00 ^ ocb->aOffset_current[x];
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57 }
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58 }
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59
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60 /* Sum = Sum_m xor ENCIPHER(K, CipherInput) */
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61 if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(tmp, tmp, &ocb->key)) != CRYPT_OK) {
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62 goto LBL_ERR;
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63 }
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64 ocb3_int_xor_blocks(ocb->aSum_current, ocb->aSum_current, tmp, ocb->block_len);
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65 }
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66
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67 /* finalize TAG computing */
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68
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69 /* at this point ocb->aSum_current = HASH(K, A) */
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70 /* tag = tag ^ HASH(K, A) */
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71 ocb3_int_xor_blocks(tmp, ocb->tag_part, ocb->aSum_current, ocb->block_len);
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72
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73 /* copy tag bytes */
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74 for(x = 0; x < ocb->tag_len; x++) tag[x] = tmp[x];
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75 *taglen = (unsigned long)ocb->tag_len;
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76
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77 err = CRYPT_OK;
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78
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79 LBL_ERR:
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80 #ifdef LTC_CLEAN_STACK
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81 zeromem(tmp, MAXBLOCKSIZE);
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82 zeromem(ocb, sizeof(*ocb));
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83 #endif
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84
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85 return err;
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86 }
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87
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88 #endif
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89
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90 /* ref: $Format:%D$ */
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91 /* git commit: $Format:%H$ */
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92 /* commit time: $Format:%ai$ */