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annotate libtomcrypt/src/pk/asn1/der/generalizedtime/der_encode_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_encode_utctime.c
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13 ASN.1 DER, encode a GeneralizedTime, Steffen Jaeckel
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14 Based on der_encode_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 const char * const baseten = "0123456789";
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20
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21 #define STORE_V(y) do {\
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22 out[x++] = der_ia5_char_encode(baseten[(y/10) % 10]); \
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23 out[x++] = der_ia5_char_encode(baseten[y % 10]); \
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24 } while(0)
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25
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26 #define STORE_V4(y) do {\
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27 out[x++] = der_ia5_char_encode(baseten[(y/1000) % 10]); \
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28 out[x++] = der_ia5_char_encode(baseten[(y/100) % 10]); \
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29 out[x++] = der_ia5_char_encode(baseten[(y/10) % 10]); \
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30 out[x++] = der_ia5_char_encode(baseten[y % 10]); \
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31 } while(0)
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32
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33 /**
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34 Encodes a Generalized time structure in DER format
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35 @param gtime The GeneralizedTime structure to encode
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36 @param out The destination of the DER encoding of the GeneralizedTime structure
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37 @param outlen [in/out] The length of the DER encoding
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38 @return CRYPT_OK if successful
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39 */
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40 int der_encode_generalizedtime(ltc_generalizedtime *gtime,
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41 unsigned char *out, unsigned long *outlen)
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42 {
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43 unsigned long x, tmplen;
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44 int err;
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45
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46 LTC_ARGCHK(gtime != NULL);
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47 LTC_ARGCHK(out != NULL);
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48 LTC_ARGCHK(outlen != NULL);
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49
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50 if ((err = der_length_generalizedtime(gtime, &tmplen)) != CRYPT_OK) {
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51 return err;
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52 }
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53 if (tmplen > *outlen) {
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54 *outlen = tmplen;
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55 return CRYPT_BUFFER_OVERFLOW;
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56 }
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57
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58 /* store header */
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59 out[0] = 0x18;
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60
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61 /* store values */
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62 x = 2;
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63 STORE_V4(gtime->YYYY);
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64 STORE_V(gtime->MM);
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65 STORE_V(gtime->DD);
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66 STORE_V(gtime->hh);
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67 STORE_V(gtime->mm);
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68 STORE_V(gtime->ss);
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69
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70 if (gtime->fs) {
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71 unsigned long divisor;
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72 unsigned fs = gtime->fs;
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73 unsigned len = 0;
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74 out[x++] = der_ia5_char_encode('.');
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75 divisor = 1;
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76 do {
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77 fs /= 10;
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78 divisor *= 10;
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79 len++;
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80 } while(fs != 0);
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81 while (len-- > 1) {
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82 divisor /= 10;
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83 out[x++] = der_ia5_char_encode(baseten[(gtime->fs/divisor) % 10]);
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84 }
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85 out[x++] = der_ia5_char_encode(baseten[gtime->fs % 10]);
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86 }
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87
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88 if (gtime->off_mm || gtime->off_hh) {
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89 out[x++] = der_ia5_char_encode(gtime->off_dir ? '-' : '+');
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90 STORE_V(gtime->off_hh);
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91 STORE_V(gtime->off_mm);
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92 } else {
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93 out[x++] = der_ia5_char_encode('Z');
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94 }
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95
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96 /* store length */
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97 out[1] = (unsigned char)(x - 2);
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98
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99 /* all good let's return */
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100 *outlen = x;
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101 return CRYPT_OK;
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102 }
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103
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104 #endif
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105
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106 /* ref: $Format:%D$ */
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107 /* git commit: $Format:%H$ */
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108 /* commit time: $Format:%ai$ */