annotate libtomcrypt/src/mac/hmac/hmac_memory_multi.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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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 #include <stdarg.h>
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11
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12 /**
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13 @file hmac_memory_multi.c
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14 HMAC support, process multiple blocks of memory, Tom St Denis/Dobes Vandermeer
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15 */
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16
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17 #ifdef LTC_HMAC
285
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18
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19 /**
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20 HMAC multiple blocks of memory to produce the authentication tag
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21 @param hash The index of the hash to use
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22 @param key The secret key
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23 @param keylen The length of the secret key (octets)
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24 @param out [out] Destination of the authentication tag
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25 @param outlen [in/out] Max size and resulting size of authentication tag
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26 @param in The data to HMAC
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27 @param inlen The length of the data to HMAC (octets)
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28 @param ... tuples of (data,len) pairs to HMAC, terminated with a (NULL,x) (x=don't care)
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29 @return CRYPT_OK if successful
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30 */
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31 int hmac_memory_multi(int hash,
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32 const unsigned char *key, unsigned long keylen,
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33 unsigned char *out, unsigned long *outlen,
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34 const unsigned char *in, unsigned long inlen, ...)
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35
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36 {
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37 hmac_state *hmac;
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38 int err;
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39 va_list args;
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40 const unsigned char *curptr;
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41 unsigned long curlen;
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43 LTC_ARGCHK(key != NULL);
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44 LTC_ARGCHK(in != NULL);
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45 LTC_ARGCHK(out != NULL);
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46 LTC_ARGCHK(outlen != NULL);
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47
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48 /* allocate ram for hmac state */
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49 hmac = XMALLOC(sizeof(hmac_state));
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50 if (hmac == NULL) {
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51 return CRYPT_MEM;
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52 }
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53
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54 if ((err = hmac_init(hmac, hash, key, keylen)) != CRYPT_OK) {
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55 goto LBL_ERR;
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56 }
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57
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58 va_start(args, inlen);
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59 curptr = in;
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60 curlen = inlen;
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61 for (;;) {
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62 /* process buf */
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63 if ((err = hmac_process(hmac, curptr, curlen)) != CRYPT_OK) {
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64 goto LBL_ERR;
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65 }
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66 /* step to next */
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67 curptr = va_arg(args, const unsigned char*);
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68 if (curptr == NULL) {
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69 break;
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70 }
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71 curlen = va_arg(args, unsigned long);
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72 }
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73 if ((err = hmac_done(hmac, out, outlen)) != CRYPT_OK) {
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74 goto LBL_ERR;
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75 }
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76 LBL_ERR:
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77 #ifdef LTC_CLEAN_STACK
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78 zeromem(hmac, sizeof(hmac_state));
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79 #endif
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80 XFREE(hmac);
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81 va_end(args);
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82 return err;
285
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83 }
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84
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85 #endif
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86
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87
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88 /* ref: $Format:%D$ */
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89 /* git commit: $Format:%H$ */
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90 /* commit time: $Format:%ai$ */