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annotate libtomcrypt/src/pk/dh/dh_import.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:
rev   line source
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
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10 #include "tomcrypt.h"
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11
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12 #ifdef LTC_MDH
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13
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14 /**
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15 Import a DH key from a binary packet
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16 @param in The packet to read
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17 @param inlen The length of the input packet
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18 @param key [out] Where to import the key to
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19 @return CRYPT_OK if successful, on error all allocated memory is freed automatically
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20 */
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21 int dh_import(const unsigned char *in, unsigned long inlen, dh_key *key)
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22 {
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23 unsigned char flags[1];
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24 int err;
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25 unsigned long version;
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26
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27 LTC_ARGCHK(in != NULL);
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28 LTC_ARGCHK(key != NULL);
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29
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30 /* init */
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31 if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) {
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32 return err;
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33 }
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34
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35 /* find out what type of key it is */
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36 err = der_decode_sequence_multi(in, inlen,
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37 LTC_ASN1_SHORT_INTEGER, 1UL, &version,
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38 LTC_ASN1_BIT_STRING, 1UL, &flags,
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39 LTC_ASN1_EOL, 0UL, NULL);
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40 if (err != CRYPT_OK && err != CRYPT_INPUT_TOO_LONG) {
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41 goto error;
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42 }
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43
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44 if (version == 0) {
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45 if (flags[0] == 1) {
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46 key->type = PK_PRIVATE;
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47 if ((err = der_decode_sequence_multi(in, inlen,
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48 LTC_ASN1_SHORT_INTEGER, 1UL, &version,
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49 LTC_ASN1_BIT_STRING, 1UL, flags,
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50 LTC_ASN1_INTEGER, 1UL, key->prime,
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51 LTC_ASN1_INTEGER, 1UL, key->base,
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52 LTC_ASN1_INTEGER, 1UL, key->x,
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53 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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54 goto error;
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55 }
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56 /* compute public key: y = (base ^ x) mod prime */
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57 if ((err = mp_exptmod(key->base, key->x, key->prime, key->y)) != CRYPT_OK) {
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58 goto error;
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59 }
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60 }
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61 else if (flags[0] == 0) {
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62 key->type = PK_PUBLIC;
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63 if ((err = der_decode_sequence_multi(in, inlen,
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64 LTC_ASN1_SHORT_INTEGER, 1UL, &version,
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65 LTC_ASN1_BIT_STRING, 1UL, flags,
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66 LTC_ASN1_INTEGER, 1UL, key->prime,
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67 LTC_ASN1_INTEGER, 1UL, key->base,
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68 LTC_ASN1_INTEGER, 1UL, key->y,
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69 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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70 goto error;
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71 }
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72 }
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73 else {
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74 err = CRYPT_INVALID_PACKET;
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75 goto error;
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76 }
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77 }
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78 else {
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79 err = CRYPT_INVALID_PACKET;
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80 goto error;
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81 }
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82
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83 /* check public key */
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84 if ((err = dh_check_pubkey(key)) != CRYPT_OK) {
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85 goto error;
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86 }
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87
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88 return CRYPT_OK;
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89
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90 error:
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91 dh_free(key);
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92 return err;
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93 }
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94
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95 #endif /* LTC_MDH */
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96
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97 /* ref: $Format:%D$ */
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98 /* git commit: $Format:%H$ */
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99 /* commit time: $Format:%ai$ */