Mercurial > dropbear

annotate libtomcrypt/src/mac/xcbc/xcbc_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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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_done.c
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13 XCBC Support, terminate the 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 /** Terminate the XCBC-MAC state
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19 @param xcbc XCBC state to terminate
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20 @param out [out] Destination for the MAC tag
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21 @param outlen [in/out] Destination size and final tag size
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22 Return CRYPT_OK on success
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23 */
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24 int xcbc_done(xcbc_state *xcbc, unsigned char *out, unsigned long *outlen)
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25 {
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26 int err, x;
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27 LTC_ARGCHK(xcbc != NULL);
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28 LTC_ARGCHK(out != NULL);
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29
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30 /* check structure */
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31 if ((err = cipher_is_valid(xcbc->cipher)) != CRYPT_OK) {
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32 return err;
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33 }
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34
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35 if ((xcbc->blocksize > cipher_descriptor[xcbc->cipher].block_length) || (xcbc->blocksize < 0) ||
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36 (xcbc->buflen > xcbc->blocksize) || (xcbc->buflen < 0)) {
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37 return CRYPT_INVALID_ARG;
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38 }
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39
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40 /* which key do we use? */
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41 if (xcbc->buflen == xcbc->blocksize) {
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42 /* k2 */
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43 for (x = 0; x < xcbc->blocksize; x++) {
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44 xcbc->IV[x] ^= xcbc->K[1][x];
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45 }
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46 } else {
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47 xcbc->IV[xcbc->buflen] ^= 0x80;
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48 /* k3 */
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49 for (x = 0; x < xcbc->blocksize; x++) {
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50 xcbc->IV[x] ^= xcbc->K[2][x];
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51 }
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52 }
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53
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54 /* encrypt */
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55 cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key);
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56 cipher_descriptor[xcbc->cipher].done(&xcbc->key);
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57
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58 /* extract tag */
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59 for (x = 0; x < xcbc->blocksize && (unsigned long)x < *outlen; x++) {
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60 out[x] = xcbc->IV[x];
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61 }
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62 *outlen = x;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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63
382
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64 #ifdef LTC_CLEAN_STACK
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65 zeromem(xcbc, sizeof(*xcbc));
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66 #endif
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67 return CRYPT_OK;
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68 }
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69
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70 #endif
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71
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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72 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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73 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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74 /* commit time: $Format:%ai$ */
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75