Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/set/der_encode_set.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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382
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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_set.c
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13 ASN.1 DER, Encode a SET, 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 /* LTC define to ASN.1 TAG */
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19 static int _ltc_to_asn1(ltc_asn1_type v)
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20 {
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21 switch (v) {
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22 case LTC_ASN1_BOOLEAN: return 0x01;
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23 case LTC_ASN1_INTEGER:
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24 case LTC_ASN1_SHORT_INTEGER: return 0x02;
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25 case LTC_ASN1_RAW_BIT_STRING:
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26 case LTC_ASN1_BIT_STRING: return 0x03;
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27 case LTC_ASN1_OCTET_STRING: return 0x04;
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28 case LTC_ASN1_NULL: return 0x05;
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29 case LTC_ASN1_OBJECT_IDENTIFIER: return 0x06;
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30 case LTC_ASN1_UTF8_STRING: return 0x0C;
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31 case LTC_ASN1_PRINTABLE_STRING: return 0x13;
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32 case LTC_ASN1_TELETEX_STRING: return 0x14;
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33 case LTC_ASN1_IA5_STRING: return 0x16;
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34 case LTC_ASN1_UTCTIME: return 0x17;
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35 case LTC_ASN1_GENERALIZEDTIME: return 0x18;
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36 case LTC_ASN1_SEQUENCE: return 0x30;
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37 case LTC_ASN1_SET:
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38 case LTC_ASN1_SETOF: return 0x31;
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39 case LTC_ASN1_CHOICE:
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40 case LTC_ASN1_CONSTRUCTED:
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41 case LTC_ASN1_CONTEXT_SPECIFIC:
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42 case LTC_ASN1_EOL: return -1;
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43 }
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44 return -1;
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45 }
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46
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47
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48 static int _qsort_helper(const void *a, const void *b)
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49 {
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50 ltc_asn1_list *A = (ltc_asn1_list *)a, *B = (ltc_asn1_list *)b;
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51 int r;
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52
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53 r = _ltc_to_asn1(A->type) - _ltc_to_asn1(B->type);
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54
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55 /* for QSORT the order is UNDEFINED if they are "equal" which means it is NOT DETERMINISTIC. So we force it to be :-) */
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56 if (r == 0) {
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57 /* their order in the original list now determines the position */
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58 return A->used - B->used;
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59 } else {
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60 return r;
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61 }
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62 }
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63
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64 /*
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65 Encode a SET type
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66 @param list The list of items to encode
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67 @param inlen The number of items in the list
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68 @param out [out] The destination
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69 @param outlen [in/out] The size of the output
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70 @return CRYPT_OK on success
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71 */
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72 int der_encode_set(ltc_asn1_list *list, unsigned long inlen,
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73 unsigned char *out, unsigned long *outlen)
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74 {
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75 ltc_asn1_list *copy;
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76 unsigned long x;
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77 int err;
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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78
382
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79 /* make copy of list */
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80 copy = XCALLOC(inlen, sizeof(*copy));
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81 if (copy == NULL) {
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82 return CRYPT_MEM;
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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84
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85 /* fill in used member with index so we can fully sort it */
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86 for (x = 0; x < inlen; x++) {
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87 copy[x] = list[x];
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88 copy[x].used = x;
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89 }
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90
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91 /* sort it by the "type" field */
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92 XQSORT(copy, inlen, sizeof(*copy), &_qsort_helper);
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93
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94 /* call der_encode_sequence_ex() */
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95 err = der_encode_sequence_ex(copy, inlen, out, outlen, LTC_ASN1_SET);
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96
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97 /* free list */
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98 XFREE(copy);
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99
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100 return err;
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101 }
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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: $Format:%ai$ */