Mercurial > dropbear
annotate libtomcrypt/src/pk/dsa/dsa_export.c @ 1715:3974f087d9c0
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> |
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date | Mon, 15 Jun 2020 18:22:18 +0500 |
parents | e9dba7abd939 |
children |
rev | line source |
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285
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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 dsa_export.c |
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13 DSA implementation, export key, Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_MDSA |
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17 |
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18 /** |
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19 Export a DSA key to a binary packet |
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20 @param out [out] Where to store the packet |
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21 @param outlen [in/out] The max size and resulting size of the packet |
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22 @param type The type of key to export (PK_PRIVATE or PK_PUBLIC) |
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23 @param key The key to export |
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24 @return CRYPT_OK if successful |
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25 */ |
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26 int dsa_export(unsigned char *out, unsigned long *outlen, int type, dsa_key *key) |
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27 { |
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28 unsigned long zero=0; |
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29 int err, std; |
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30 |
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31 LTC_ARGCHK(out != NULL); |
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32 LTC_ARGCHK(outlen != NULL); |
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33 LTC_ARGCHK(key != NULL); |
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34 |
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35 std = type & PK_STD; |
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36 type &= ~PK_STD; |
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37 |
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38 /* can we store the static header? */ |
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39 if (type == PK_PRIVATE && key->type != PK_PRIVATE) { |
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40 return CRYPT_PK_TYPE_MISMATCH; |
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41 } |
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42 |
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43 if (type != PK_PUBLIC && type != PK_PRIVATE) { |
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44 return CRYPT_INVALID_ARG; |
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45 } |
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46 |
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47 if (type == PK_PRIVATE) { |
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48 if (std) { |
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49 return der_encode_sequence_multi(out, outlen, |
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50 LTC_ASN1_SHORT_INTEGER, 1UL, &zero, |
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51 LTC_ASN1_INTEGER, 1UL, key->p, |
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52 LTC_ASN1_INTEGER, 1UL, key->q, |
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53 LTC_ASN1_INTEGER, 1UL, key->g, |
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54 LTC_ASN1_INTEGER, 1UL, key->y, |
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55 LTC_ASN1_INTEGER, 1UL, key->x, |
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56 LTC_ASN1_EOL, 0UL, NULL); |
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57 } |
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58 else { |
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59 unsigned char flags[1]; |
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60 flags[0] = 1; |
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61 return der_encode_sequence_multi(out, outlen, |
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62 LTC_ASN1_BIT_STRING, 1UL, flags, |
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63 LTC_ASN1_INTEGER, 1UL, key->g, |
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64 LTC_ASN1_INTEGER, 1UL, key->p, |
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65 LTC_ASN1_INTEGER, 1UL, key->q, |
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66 LTC_ASN1_INTEGER, 1UL, key->y, |
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67 LTC_ASN1_INTEGER, 1UL, key->x, |
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68 LTC_ASN1_EOL, 0UL, NULL); |
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69 } |
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70 } else { |
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71 if (std) { |
1711 | 72 unsigned long tmplen = (unsigned long)(mp_count_bits(key->y) / 8) + 8; |
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73 unsigned char* tmp = XMALLOC(tmplen); |
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74 ltc_asn1_list int_list[3]; |
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75 |
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76 if (tmp == NULL) { |
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77 return CRYPT_MEM; |
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78 } |
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79 |
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80 err = der_encode_integer(key->y, tmp, &tmplen); |
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81 if (err != CRYPT_OK) { |
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82 goto error; |
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83 } |
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84 |
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85 LTC_SET_ASN1(int_list, 0, LTC_ASN1_INTEGER, key->p, 1UL); |
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86 LTC_SET_ASN1(int_list, 1, LTC_ASN1_INTEGER, key->q, 1UL); |
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87 LTC_SET_ASN1(int_list, 2, LTC_ASN1_INTEGER, key->g, 1UL); |
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88 |
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89 err = der_encode_subject_public_key_info(out, outlen, PKA_DSA, tmp, |
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90 tmplen, LTC_ASN1_SEQUENCE, int_list, |
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91 sizeof(int_list) / sizeof(int_list[0])); |
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92 |
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93 error: |
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94 XFREE(tmp); |
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95 return err; |
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96 } |
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97 else { |
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98 unsigned char flags[1]; |
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99 flags[0] = 0; |
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100 return der_encode_sequence_multi(out, outlen, |
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101 LTC_ASN1_BIT_STRING, 1UL, flags, |
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102 LTC_ASN1_INTEGER, 1UL, key->g, |
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103 LTC_ASN1_INTEGER, 1UL, key->p, |
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104 LTC_ASN1_INTEGER, 1UL, key->q, |
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105 LTC_ASN1_INTEGER, 1UL, key->y, |
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106 LTC_ASN1_EOL, 0UL, NULL); |
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107 } |
285
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108 } |
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109 } |
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110 |
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111 #endif |
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112 |
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113 |
1471
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114 /* ref: $Format:%D$ */ |
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115 /* git commit: $Format:%H$ */ |
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116 /* commit time: $Format:%ai$ */ |