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annotate libtomcrypt/src/pk/asn1/der/bit/der_decode_raw_bit_string.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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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file der_decode_bit_string.c
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13 ASN.1 DER, encode a BIT STRING, Tom St Denis
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14 */
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15
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16
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17 #ifdef LTC_DER
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18
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19 #define SETBIT(v, n) (v=((unsigned char)(v) | (1U << (unsigned char)(n))))
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20 #define CLRBIT(v, n) (v=((unsigned char)(v) & ~(1U << (unsigned char)(n))))
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21
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22 /**
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23 Store a BIT STRING
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24 @param in The DER encoded BIT STRING
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25 @param inlen The size of the DER BIT STRING
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26 @param out [out] The array of bits stored (8 per char)
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27 @param outlen [in/out] The number of bits stored
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28 @return CRYPT_OK if successful
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29 */
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30 int der_decode_raw_bit_string(const unsigned char *in, unsigned long inlen,
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31 unsigned char *out, unsigned long *outlen)
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32 {
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33 unsigned long dlen, blen, x, y;
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34
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35 LTC_ARGCHK(in != NULL);
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36 LTC_ARGCHK(out != NULL);
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37 LTC_ARGCHK(outlen != NULL);
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38
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39 /* packet must be at least 4 bytes */
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40 if (inlen < 4) {
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41 return CRYPT_INVALID_ARG;
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42 }
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43
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44 /* check for 0x03 */
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45 if ((in[0]&0x1F) != 0x03) {
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46 return CRYPT_INVALID_PACKET;
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47 }
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48
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49 /* offset in the data */
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50 x = 1;
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51
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52 /* get the length of the data */
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53 if (in[x] & 0x80) {
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54 /* long format get number of length bytes */
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55 y = in[x++] & 0x7F;
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56
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57 /* invalid if 0 or > 2 */
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58 if (y == 0 || y > 2) {
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59 return CRYPT_INVALID_PACKET;
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60 }
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61
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62 /* read the data len */
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63 dlen = 0;
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64 while (y--) {
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65 dlen = (dlen << 8) | (unsigned long)in[x++];
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66 }
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67 } else {
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68 /* short format */
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69 dlen = in[x++] & 0x7F;
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70 }
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71
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72 /* is the data len too long or too short? */
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73 if ((dlen == 0) || (dlen + x > inlen)) {
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74 return CRYPT_INVALID_PACKET;
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75 }
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76
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77 /* get padding count */
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78 blen = ((dlen - 1) << 3) - (in[x++] & 7);
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79
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80 /* too many bits? */
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81 if (blen > *outlen) {
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82 *outlen = blen;
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83 return CRYPT_BUFFER_OVERFLOW;
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84 }
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85
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86 /* decode/store the bits */
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87 for (y = 0; y < blen; y++) {
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88 if (in[x] & (1 << (7 - (y & 7)))) {
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89 SETBIT(out[y/8], 7-(y%8));
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90 } else {
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91 CLRBIT(out[y/8], 7-(y%8));
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92 }
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93 if ((y & 7) == 7) {
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94 ++x;
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95 }
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96 }
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97
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98 /* we done */
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99 *outlen = blen;
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100 return CRYPT_OK;
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101 }
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102
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103 #endif
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104
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105 /* ref: $Format:%D$ */
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106 /* git commit: $Format:%H$ */
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107 /* commit time: $Format:%ai$ */