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annotate libtomcrypt/src/hashes/helper/hash_filehandle.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 1ff2a1034c52
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 #ifndef LTC_NO_FILE
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12 /**
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13 @file hash_filehandle.c
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14 Hash open files, Tom St Denis
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15 */
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16
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17 /**
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18 Hash data from an open file handle.
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19 @param hash The index of the hash you want to use
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20 @param in The FILE* handle of the file you want to hash
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21 @param out [out] The destination of the digest
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22 @param outlen [in/out] The max size and resulting size of the digest
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23 @result CRYPT_OK if successful
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24 */
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25 int hash_filehandle(int hash, FILE *in, unsigned char *out, unsigned long *outlen)
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26 {
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27 hash_state md;
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28 unsigned char *buf;
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29 size_t x;
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30 int err;
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32 LTC_ARGCHK(out != NULL);
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33 LTC_ARGCHK(outlen != NULL);
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34 LTC_ARGCHK(in != NULL);
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35
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36 if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
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37 return CRYPT_MEM;
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38 }
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39
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40 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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41 goto LBL_ERR;
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42 }
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44 if (*outlen < hash_descriptor[hash].hashsize) {
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45 *outlen = hash_descriptor[hash].hashsize;
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46 err = CRYPT_BUFFER_OVERFLOW;
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47 goto LBL_ERR;
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48 }
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49 if ((err = hash_descriptor[hash].init(&md)) != CRYPT_OK) {
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50 goto LBL_ERR;
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51 }
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52
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53 do {
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54 x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
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55 if ((err = hash_descriptor[hash].process(&md, buf, (unsigned long)x)) != CRYPT_OK) {
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56 goto LBL_CLEANBUF;
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57 }
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58 } while (x == LTC_FILE_READ_BUFSIZE);
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59 if ((err = hash_descriptor[hash].done(&md, out)) == CRYPT_OK) {
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60 *outlen = hash_descriptor[hash].hashsize;
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61 }
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62
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63 LBL_CLEANBUF:
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64 zeromem(buf, LTC_FILE_READ_BUFSIZE);
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65 LBL_ERR:
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66 XFREE(buf);
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67 return err;
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68 }
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69 #endif /* #ifndef LTC_NO_FILE */
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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: $Format:%ai$ */