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annotate libtomcrypt/src/pk/asn1/der/generalizedtime/der_decode_generalizedtime.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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rev   line source
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_generalizedtime.c
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13 ASN.1 DER, decode a GeneralizedTime, Steffen Jaeckel
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14 Based on der_decode_utctime.c
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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 static int _char_to_int(unsigned char x)
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20 {
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21 switch (x) {
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22 case '0': return 0;
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23 case '1': return 1;
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24 case '2': return 2;
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25 case '3': return 3;
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26 case '4': return 4;
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27 case '5': return 5;
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28 case '6': return 6;
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29 case '7': return 7;
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30 case '8': return 8;
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31 case '9': return 9;
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32 default: return 100;
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33 }
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34 }
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35
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36 #define DECODE_V(y, max) do {\
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37 y = _char_to_int(buf[x])*10 + _char_to_int(buf[x+1]); \
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38 if (y >= max) return CRYPT_INVALID_PACKET; \
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39 x += 2; \
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40 } while(0)
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41
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42 #define DECODE_V4(y, max) do {\
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43 y = _char_to_int(buf[x])*1000 + _char_to_int(buf[x+1])*100 + _char_to_int(buf[x+2])*10 + _char_to_int(buf[x+3]); \
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44 if (y >= max) return CRYPT_INVALID_PACKET; \
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45 x += 4; \
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46 } while(0)
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47
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48 /**
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49 Decodes a Generalized time structure in DER format (reads all 6 valid encoding formats)
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50 @param in Input buffer
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51 @param inlen Length of input buffer in octets
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52 @param out [out] Destination of Generalized time structure
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53 @return CRYPT_OK if successful
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54 */
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55 int der_decode_generalizedtime(const unsigned char *in, unsigned long *inlen,
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56 ltc_generalizedtime *out)
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57 {
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58 unsigned char buf[32];
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59 unsigned long x;
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60 int y;
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61
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62 LTC_ARGCHK(in != NULL);
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63 LTC_ARGCHK(inlen != NULL);
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64 LTC_ARGCHK(out != NULL);
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65
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66 /* check header */
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67 if (*inlen < 2UL || (in[1] >= sizeof(buf)) || ((in[1] + 2UL) > *inlen)) {
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68 return CRYPT_INVALID_PACKET;
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69 }
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70
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71 /* decode the string */
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72 for (x = 0; x < in[1]; x++) {
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73 y = der_ia5_value_decode(in[x+2]);
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74 if (y == -1) {
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75 return CRYPT_INVALID_PACKET;
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76 }
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77 if (!((y >= '0' && y <= '9')
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78 || y == 'Z' || y == '.'
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79 || y == '+' || y == '-')) {
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80 return CRYPT_INVALID_PACKET;
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81 }
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82 buf[x] = y;
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83 }
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84 *inlen = 2 + x;
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85
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86 if (x < 15) {
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87 return CRYPT_INVALID_PACKET;
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88 }
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89
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90 /* possible encodings are
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91 YYYYMMDDhhmmssZ
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92 YYYYMMDDhhmmss+hh'mm'
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93 YYYYMMDDhhmmss-hh'mm'
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94 YYYYMMDDhhmmss.fsZ
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95 YYYYMMDDhhmmss.fs+hh'mm'
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96 YYYYMMDDhhmmss.fs-hh'mm'
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97
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98 So let's do a trivial decode upto [including] ss
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99 */
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100
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101 x = 0;
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102 DECODE_V4(out->YYYY, 10000);
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103 DECODE_V(out->MM, 13);
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104 DECODE_V(out->DD, 32);
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105 DECODE_V(out->hh, 24);
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106 DECODE_V(out->mm, 60);
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107 DECODE_V(out->ss, 60);
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108
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109 /* clear fractional seconds info */
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110 out->fs = 0;
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111
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112 /* now is it Z or . */
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113 if (buf[x] == 'Z') {
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114 return CRYPT_OK;
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115 } else if (buf[x] == '.') {
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116 x++;
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117 while (buf[x] >= '0' && buf[x] <= '9') {
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118 unsigned fs = out->fs;
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119 if (x >= sizeof(buf)) return CRYPT_INVALID_PACKET;
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120 out->fs *= 10;
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121 out->fs += _char_to_int(buf[x]);
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122 if (fs > out->fs) return CRYPT_OVERFLOW;
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123 x++;
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124 }
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125 }
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126
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127 /* now is it Z, +, - */
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128 if (buf[x] == 'Z') {
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129 return CRYPT_OK;
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130 } else if (buf[x] == '+' || buf[x] == '-') {
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131 out->off_dir = (buf[x++] == '+') ? 0 : 1;
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132 DECODE_V(out->off_hh, 24);
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133 DECODE_V(out->off_mm, 60);
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134 return CRYPT_OK;
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135 } else {
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136 return CRYPT_INVALID_PACKET;
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137 }
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138 }
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139
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140 #endif
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141
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142 /* ref: $Format:%D$ */
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143 /* git commit: $Format:%H$ */
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144 /* commit time: $Format:%ai$ */