Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_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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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 omac_memory.c
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13 OMAC1 support, process a block of memory, Tom St Denis
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14 */
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15
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16 #ifdef LTC_OMAC
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18 /**
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19 OMAC a block of memory
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20 @param cipher The index of the desired cipher
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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 in The data to send through OMAC
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24 @param inlen The length of the data to send through OMAC (octets)
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25 @param out [out] The destination of the authentication tag
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26 @param outlen [in/out] The max size and resulting size of the authentication tag (octets)
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27 @return CRYPT_OK if successful
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28 */
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29 int omac_memory(int cipher,
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30 const unsigned char *key, unsigned long keylen,
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31 const unsigned char *in, unsigned long inlen,
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32 unsigned char *out, unsigned long *outlen)
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33 {
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34 int err;
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35 omac_state *omac;
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36
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37 LTC_ARGCHK(key != NULL);
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38 LTC_ARGCHK(in != NULL);
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39 LTC_ARGCHK(out != NULL);
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40 LTC_ARGCHK(outlen != NULL);
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41
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42 /* is the cipher valid? */
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43 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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44 return err;
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45 }
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46
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47 /* Use accelerator if found */
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48 if (cipher_descriptor[cipher].omac_memory != NULL) {
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49 return cipher_descriptor[cipher].omac_memory(key, keylen, in, inlen, out, outlen);
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50 }
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51
285
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52 /* allocate ram for omac state */
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53 omac = XMALLOC(sizeof(omac_state));
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54 if (omac == NULL) {
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55 return CRYPT_MEM;
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56 }
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57
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58 /* omac process the message */
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59 if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) {
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60 goto LBL_ERR;
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61 }
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62 if ((err = omac_process(omac, in, inlen)) != CRYPT_OK) {
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63 goto LBL_ERR;
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64 }
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65 if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) {
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66 goto LBL_ERR;
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67 }
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68
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69 err = CRYPT_OK;
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70 LBL_ERR:
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71 #ifdef LTC_CLEAN_STACK
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72 zeromem(omac, sizeof(omac_state));
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73 #endif
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74
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75 XFREE(omac);
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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76 return err;
285
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77 }
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78
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79 #endif
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80
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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81 /* ref: $Format:%D$ */
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82 /* git commit: $Format:%H$ */
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83 /* commit time: $Format:%ai$ */