Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/object_identifier/der_encode_object_identifier.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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285
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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_encode_object_identifier.c
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13 ASN.1 DER, Encode Object Identifier, Tom St Denis
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14 */
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15
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16 #ifdef LTC_DER
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17 /**
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18 Encode an OID
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19 @param words The words to encode (upto 32-bits each)
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20 @param nwords The number of words in the OID
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21 @param out [out] Destination of OID data
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22 @param outlen [in/out] The max and resulting size of the OID
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23 @return CRYPT_OK if successful
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24 */
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25 int der_encode_object_identifier(unsigned long *words, unsigned long nwords,
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26 unsigned char *out, unsigned long *outlen)
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27 {
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28 unsigned long i, x, y, z, t, mask, wordbuf;
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29 int err;
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30
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31 LTC_ARGCHK(words != NULL);
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32 LTC_ARGCHK(out != NULL);
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33 LTC_ARGCHK(outlen != NULL);
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34
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35 /* check length */
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36 if ((err = der_length_object_identifier(words, nwords, &x)) != CRYPT_OK) {
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37 return err;
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38 }
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39 if (x > *outlen) {
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40 *outlen = x;
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41 return CRYPT_BUFFER_OVERFLOW;
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42 }
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43
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44 /* compute length to store OID data */
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45 z = 0;
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46 wordbuf = words[0] * 40 + words[1];
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47 for (y = 1; y < nwords; y++) {
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48 t = der_object_identifier_bits(wordbuf);
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49 z += t/7 + ((t%7) ? 1 : 0) + (wordbuf == 0 ? 1 : 0);
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50 if (y < nwords - 1) {
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51 wordbuf = words[y + 1];
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52 }
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53 }
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54
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55 /* store header + length */
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56 x = 0;
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57 out[x++] = 0x06;
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58 if (z < 128) {
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59 out[x++] = (unsigned char)z;
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60 } else if (z < 256) {
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61 out[x++] = 0x81;
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62 out[x++] = (unsigned char)z;
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63 } else if (z < 65536UL) {
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64 out[x++] = 0x82;
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65 out[x++] = (unsigned char)((z>>8)&255);
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66 out[x++] = (unsigned char)(z&255);
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67 } else {
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68 return CRYPT_INVALID_ARG;
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69 }
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70
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71 /* store first byte */
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72 wordbuf = words[0] * 40 + words[1];
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73 for (i = 1; i < nwords; i++) {
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74 /* store 7 bit words in little endian */
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75 t = wordbuf & 0xFFFFFFFF;
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76 if (t) {
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77 y = x;
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78 mask = 0;
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79 while (t) {
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80 out[x++] = (unsigned char)((t & 0x7F) | mask);
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81 t >>= 7;
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82 mask |= 0x80; /* upper bit is set on all but the last byte */
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83 }
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84 /* now swap bytes y...x-1 */
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85 z = x - 1;
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86 while (y < z) {
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87 t = out[y]; out[y] = out[z]; out[z] = (unsigned char)t;
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88 ++y;
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89 --z;
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90 }
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91 } else {
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92 /* zero word */
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93 out[x++] = 0x00;
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94 }
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95
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96 if (i < nwords - 1) {
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97 wordbuf = words[i + 1];
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98 }
285
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99 }
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100
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101 *outlen = x;
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102 return CRYPT_OK;
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103 }
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104
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105 #endif
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106
1471
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107 /* ref: $Format:%D$ */
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108 /* git commit: $Format:%H$ */
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109 /* commit time: $Format:%ai$ */