annotate libtomcrypt/src/encauth/chachapoly/chacha20poly1305_memory.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>
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 #include "tomcrypt.h"
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11
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12 #ifdef LTC_CHACHA20POLY1305_MODE
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13
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14 /**
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15 Process an entire GCM packet in one call.
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16 @param key The secret key
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17 @param keylen The length of the secret key
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18 @param iv The initialization vector
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19 @param ivlen The length of the initialization vector
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20 @param aad The additional authentication data (header)
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21 @param aadlen The length of the aad
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22 @param in The plaintext
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23 @param inlen The length of the plaintext (ciphertext length is the same)
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24 @param out The ciphertext
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25 @param tag [out] The MAC tag
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26 @param taglen [in/out] The MAC tag length
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27 @param direction Encrypt or Decrypt mode (CHACHA20POLY1305_ENCRYPT or CHACHA20POLY1305_DECRYPT)
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28 @return CRYPT_OK on success
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29 */
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30 int chacha20poly1305_memory(const unsigned char *key, unsigned long keylen,
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31 const unsigned char *iv, unsigned long ivlen,
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32 const unsigned char *aad, unsigned long aadlen,
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33 const unsigned char *in, unsigned long inlen,
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34 unsigned char *out,
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35 unsigned char *tag, unsigned long *taglen,
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36 int direction)
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37 {
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38 chacha20poly1305_state st;
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39 int err;
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40
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41 LTC_ARGCHK(key != NULL);
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42 LTC_ARGCHK(iv != NULL);
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43 LTC_ARGCHK(in != NULL);
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44 LTC_ARGCHK(out != NULL);
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45 LTC_ARGCHK(tag != NULL);
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46
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47 if ((err = chacha20poly1305_init(&st, key, keylen)) != CRYPT_OK) { goto LBL_ERR; }
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48 if ((err = chacha20poly1305_setiv(&st, iv, ivlen)) != CRYPT_OK) { goto LBL_ERR; }
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49 if (aad && aadlen > 0) {
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50 if ((err = chacha20poly1305_add_aad(&st, aad, aadlen)) != CRYPT_OK) { goto LBL_ERR; }
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51 }
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52 if (direction == CHACHA20POLY1305_ENCRYPT) {
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53 if ((err = chacha20poly1305_encrypt(&st, in, inlen, out)) != CRYPT_OK) { goto LBL_ERR; }
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54 }
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55 else if (direction == CHACHA20POLY1305_DECRYPT) {
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56 if ((err = chacha20poly1305_decrypt(&st, in, inlen, out)) != CRYPT_OK) { goto LBL_ERR; }
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57 }
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58 else {
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59 err = CRYPT_INVALID_ARG;
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60 goto LBL_ERR;
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61 }
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62 err = chacha20poly1305_done(&st, tag, taglen);
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63 LBL_ERR:
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64 #ifdef LTC_CLEAN_STACK
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65 zeromem(&st, sizeof(chacha20poly1305_state));
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66 #endif
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67 return err;
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68 }
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69
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70 #endif
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71
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72 /* ref: $Format:%D$ */
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73 /* git commit: $Format:%H$ */
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74 /* commit time: $Format:%ai$ */