Mercurial > dropbear

annotate libtomcrypt/src/pk/dsa/dsa_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 #include "tomcrypt.h"
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10
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11
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12 #ifdef LTC_MDSA
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13
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14 /**
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15 Import DSA's p, q & g from raw numbers
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16 @param p DSA's p in binary representation
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17 @param plen The length of p
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18 @param q DSA's q in binary representation
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19 @param qlen The length of q
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20 @param g DSA's g in binary representation
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21 @param glen The length of g
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22 @param key [out] the destination for the imported key
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23 @return CRYPT_OK if successful.
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24 */
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25 int dsa_set_pqg(const unsigned char *p, unsigned long plen,
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26 const unsigned char *q, unsigned long qlen,
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27 const unsigned char *g, unsigned long glen,
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28 dsa_key *key)
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29 {
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30 int err, stat;
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31
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32 LTC_ARGCHK(p != NULL);
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33 LTC_ARGCHK(q != NULL);
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34 LTC_ARGCHK(g != NULL);
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35 LTC_ARGCHK(key != NULL);
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36 LTC_ARGCHK(ltc_mp.name != NULL);
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37
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38 /* init key */
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39 err = mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL);
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40 if (err != CRYPT_OK) return err;
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41
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42 if ((err = mp_read_unsigned_bin(key->p, (unsigned char *)p , plen)) != CRYPT_OK) { goto LBL_ERR; }
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43 if ((err = mp_read_unsigned_bin(key->g, (unsigned char *)g , glen)) != CRYPT_OK) { goto LBL_ERR; }
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44 if ((err = mp_read_unsigned_bin(key->q, (unsigned char *)q , qlen)) != CRYPT_OK) { goto LBL_ERR; }
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45
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46 key->qord = mp_unsigned_bin_size(key->q);
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47
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48 /* do only a quick validation, without primality testing */
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49 if ((err = dsa_int_validate_pqg(key, &stat)) != CRYPT_OK) { goto LBL_ERR; }
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50 if (stat == 0) {
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51 err = CRYPT_INVALID_PACKET;
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52 goto LBL_ERR;
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53 }
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54
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55 return CRYPT_OK;
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56
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57 LBL_ERR:
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58 dsa_free(key);
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59 return err;
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60 }
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61
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62 /**
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63 Import DSA public or private key-part from raw numbers
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64
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65 NB: The p, q & g parts must be set beforehand
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66
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67 @param in The key-part to import, either public or private.
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68 @param inlen The key-part's length
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69 @param type Which type of key (PK_PRIVATE or PK_PUBLIC)
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70 @param key [out] the destination for the imported key
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71 @return CRYPT_OK if successful.
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72 */
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73 int dsa_set_key(const unsigned char *in, unsigned long inlen, int type, dsa_key *key)
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74 {
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75 int err, stat = 0;
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76
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77 LTC_ARGCHK(key != NULL);
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78 LTC_ARGCHK(key->x != NULL);
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79 LTC_ARGCHK(key->y != NULL);
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80 LTC_ARGCHK(key->p != NULL);
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81 LTC_ARGCHK(key->g != NULL);
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82 LTC_ARGCHK(key->q != NULL);
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83 LTC_ARGCHK(ltc_mp.name != NULL);
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84
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85 if (type == PK_PRIVATE) {
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86 key->type = PK_PRIVATE;
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87 if ((err = mp_read_unsigned_bin(key->x, (unsigned char *)in, inlen)) != CRYPT_OK) { goto LBL_ERR; }
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88 if ((err = mp_exptmod(key->g, key->x, key->p, key->y)) != CRYPT_OK) { goto LBL_ERR; }
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89 }
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90 else {
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91 key->type = PK_PUBLIC;
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92 if ((err = mp_read_unsigned_bin(key->y, (unsigned char *)in, inlen)) != CRYPT_OK) { goto LBL_ERR; }
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93 }
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94
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95 if ((err = dsa_int_validate_xy(key, &stat)) != CRYPT_OK) { goto LBL_ERR; }
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96 if (stat == 0) {
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97 err = CRYPT_INVALID_PACKET;
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98 goto LBL_ERR;
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99 }
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100
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101 return CRYPT_OK;
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102
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103 LBL_ERR:
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104 dsa_free(key);
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105 return err;
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106 }
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107
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108 #endif
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109
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110 /* ref: $Format:%D$ */
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111 /* git commit: $Format:%H$ */
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112 /* commit time: $Format:%ai$ */