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annotate libtomcrypt/src/pk/pkcs1/pkcs_1_v1_5_decode.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 /** @file pkcs_1_v1_5_decode.c
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12 *
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13 * PKCS #1 v1.5 Padding. (Andreas Lange)
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14 */
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15
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16 #ifdef LTC_PKCS_1
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17
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18 /** @brief PKCS #1 v1.5 decode.
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19 *
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20 * @param msg The encoded data to decode
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21 * @param msglen The length of the encoded data (octets)
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22 * @param block_type Block type to use in padding (\sa ltc_pkcs_1_v1_5_blocks)
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23 * @param modulus_bitlen The bit length of the RSA modulus
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24 * @param out [out] Destination of decoding
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25 * @param outlen [in/out] The max size and resulting size of the decoding
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26 * @param is_valid [out] Boolean whether the padding was valid
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27 *
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28 * @return CRYPT_OK if successful
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29 */
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30 int pkcs_1_v1_5_decode(const unsigned char *msg,
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31 unsigned long msglen,
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32 int block_type,
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33 unsigned long modulus_bitlen,
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34 unsigned char *out,
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35 unsigned long *outlen,
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36 int *is_valid)
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37 {
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38 unsigned long modulus_len, ps_len, i;
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39 int result;
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40
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41 /* default to invalid packet */
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42 *is_valid = 0;
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43
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44 modulus_len = (modulus_bitlen >> 3) + (modulus_bitlen & 7 ? 1 : 0);
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45
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46 /* test message size */
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47
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48 if ((msglen > modulus_len) || (modulus_len < 11)) {
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49 return CRYPT_PK_INVALID_SIZE;
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50 }
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51
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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52 result = CRYPT_OK;
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53
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54 /* separate encoded message */
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55
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56 if ((msg[0] != 0x00) || (msg[1] != (unsigned char)block_type)) {
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57 result = CRYPT_INVALID_PACKET;
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58 }
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59
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60 if (block_type == LTC_PKCS_1_EME) {
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61 for (i = 2; i < modulus_len; i++) {
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62 /* separator */
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63 if (msg[i] == 0x00) { break; }
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64 }
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65 ps_len = i++ - 2;
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66
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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67 if (i >= modulus_len) {
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68 /* There was no octet with hexadecimal value 0x00 to separate ps from m.
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69 */
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70 result = CRYPT_INVALID_PACKET;
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71 }
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72 } else {
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73 for (i = 2; i < modulus_len - 1; i++) {
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74 if (msg[i] != 0xFF) { break; }
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75 }
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76
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77 /* separator check */
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78 if (msg[i] != 0) {
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79 /* There was no octet with hexadecimal value 0x00 to separate ps from m. */
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80 result = CRYPT_INVALID_PACKET;
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81 }
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82
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83 ps_len = i - 2;
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84 }
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85
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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86 if (ps_len < 8)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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87 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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88 /* The length of ps is less than 8 octets.
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89 */
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90 result = CRYPT_INVALID_PACKET;
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91 }
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92
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93 if (*outlen < (msglen - (2 + ps_len + 1))) {
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94 result = CRYPT_INVALID_PACKET;
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95 }
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96
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97 if (result == CRYPT_OK) {
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98 *outlen = (msglen - (2 + ps_len + 1));
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99 XMEMCPY(out, &msg[2 + ps_len + 1], *outlen);
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100
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101 /* valid packet */
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102 *is_valid = 1;
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103 }
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104
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105 return result;
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106 } /* pkcs_1_v1_5_decode */
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107
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108 #endif /* #ifdef LTC_PKCS_1 */
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109
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110 /* ref: $Format:%D$ */
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111 /* git commit: $Format:%H$ */
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112 /* commit time: $Format:%ai$ */