Mercurial > dropbear

annotate libtomcrypt/src/pk/dh/dh_set.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
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 DH key parts p and g from raw numbers
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16
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17 @param p DH's p (prime)
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18 @param plen DH's p's length
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19 @param g DH's g (group)
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20 @param glen DH's g's length
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21 @param key [out] the destination for the imported key
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22 @return CRYPT_OK if successful
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23 */
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24 int dh_set_pg(const unsigned char *p, unsigned long plen,
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25 const unsigned char *g, unsigned long glen,
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26 dh_key *key)
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27 {
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28 int err;
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29
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30 LTC_ARGCHK(key != NULL);
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31 LTC_ARGCHK(p != NULL);
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32 LTC_ARGCHK(g != NULL);
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33 LTC_ARGCHK(ltc_mp.name != NULL);
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34
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35 if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) {
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36 return err;
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37 }
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38
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39 if ((err = mp_read_unsigned_bin(key->base, (unsigned char*)g, glen)) != CRYPT_OK) { goto LBL_ERR; }
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40 if ((err = mp_read_unsigned_bin(key->prime, (unsigned char*)p, plen)) != CRYPT_OK) { goto LBL_ERR; }
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41
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42 return CRYPT_OK;
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43
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44 LBL_ERR:
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45 dh_free(key);
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46 return err;
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47 }
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48
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49 /**
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50 Import DH key parts p and g from built-in DH groups
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51
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52 @param groupsize The size of the DH group to use
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53 @param key [out] Where the newly created DH key will be stored
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54 @return CRYPT_OK if successful, note: on error all allocated memory will be freed automatically.
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55 */
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56 int dh_set_pg_groupsize(int groupsize, dh_key *key)
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57 {
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58 int err, i;
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59
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60 LTC_ARGCHK(key != NULL);
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61 LTC_ARGCHK(ltc_mp.name != NULL);
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62 LTC_ARGCHK(groupsize > 0);
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63
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64 for (i = 0; (groupsize > ltc_dh_sets[i].size) && (ltc_dh_sets[i].size != 0); i++);
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65 if (ltc_dh_sets[i].size == 0) return CRYPT_INVALID_KEYSIZE;
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66
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67 if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) {
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68 return err;
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69 }
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70 if ((err = mp_read_radix(key->base, ltc_dh_sets[i].base, 16)) != CRYPT_OK) { goto LBL_ERR; }
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71 if ((err = mp_read_radix(key->prime, ltc_dh_sets[i].prime, 16)) != CRYPT_OK) { goto LBL_ERR; }
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72
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73 return CRYPT_OK;
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74
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75 LBL_ERR:
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76 dh_free(key);
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77 return err;
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78 }
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79
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80 /**
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81 Import DH public or private key part from raw numbers
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82
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83 NB: The p & g parts must be set beforehand
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84
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85 @param in The key-part to import, either public or private.
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86 @param inlen The key-part's length
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87 @param type Which type of key (PK_PRIVATE or PK_PUBLIC)
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88 @param key [out] the destination for the imported key
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89 @return CRYPT_OK if successful
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90 */
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91 int dh_set_key(const unsigned char *in, unsigned long inlen, int type, dh_key *key)
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92 {
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93 int err;
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94
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95 LTC_ARGCHK(key != NULL);
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96 LTC_ARGCHK(ltc_mp.name != NULL);
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97
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98 if (type == PK_PRIVATE) {
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99 key->type = PK_PRIVATE;
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100 if ((err = mp_read_unsigned_bin(key->x, (unsigned char*)in, inlen)) != CRYPT_OK) { goto LBL_ERR; }
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101 if ((err = mp_exptmod(key->base, key->x, key->prime, key->y)) != CRYPT_OK) { goto LBL_ERR; }
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102 }
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103 else {
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104 key->type = PK_PUBLIC;
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105 if ((err = mp_read_unsigned_bin(key->y, (unsigned char*)in, inlen)) != CRYPT_OK) { goto LBL_ERR; }
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106 }
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107
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108 /* check public key */
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109 if ((err = dh_check_pubkey(key)) != CRYPT_OK) {
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110 goto LBL_ERR;
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111 }
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112
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113 return CRYPT_OK;
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114
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115 LBL_ERR:
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116 dh_free(key);
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117 return err;
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118 }
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119
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120 #endif /* LTC_MDH */
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121
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122 /* ref: $Format:%D$ */
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123 /* git commit: $Format:%H$ */
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124 /* commit time: $Format:%ai$ */