Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/printable_string/der_length_printable_string.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
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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_length_printable_string.c
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13 ASN.1 DER, get length of Printable STRING, Tom St Denis
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14 */
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16 #ifdef LTC_DER
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17
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18 static const struct {
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19 int code, value;
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20 } printable_table[] = {
1471
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21 { ' ', 32 },
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22 { '\'', 39 },
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23 { '(', 40 },
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24 { ')', 41 },
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25 { '+', 43 },
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26 { ',', 44 },
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27 { '-', 45 },
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28 { '.', 46 },
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29 { '/', 47 },
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30 { '0', 48 },
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31 { '1', 49 },
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32 { '2', 50 },
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33 { '3', 51 },
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34 { '4', 52 },
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35 { '5', 53 },
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36 { '6', 54 },
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37 { '7', 55 },
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38 { '8', 56 },
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39 { '9', 57 },
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40 { ':', 58 },
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41 { '=', 61 },
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42 { '?', 63 },
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43 { 'A', 65 },
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44 { 'B', 66 },
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45 { 'C', 67 },
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46 { 'D', 68 },
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47 { 'E', 69 },
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48 { 'F', 70 },
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49 { 'G', 71 },
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50 { 'H', 72 },
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51 { 'I', 73 },
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52 { 'J', 74 },
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53 { 'K', 75 },
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54 { 'L', 76 },
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55 { 'M', 77 },
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56 { 'N', 78 },
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57 { 'O', 79 },
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58 { 'P', 80 },
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59 { 'Q', 81 },
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60 { 'R', 82 },
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61 { 'S', 83 },
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62 { 'T', 84 },
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63 { 'U', 85 },
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64 { 'V', 86 },
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65 { 'W', 87 },
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66 { 'X', 88 },
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67 { 'Y', 89 },
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68 { 'Z', 90 },
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69 { 'a', 97 },
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70 { 'b', 98 },
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71 { 'c', 99 },
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72 { 'd', 100 },
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73 { 'e', 101 },
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74 { 'f', 102 },
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75 { 'g', 103 },
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76 { 'h', 104 },
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77 { 'i', 105 },
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78 { 'j', 106 },
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79 { 'k', 107 },
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80 { 'l', 108 },
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81 { 'm', 109 },
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82 { 'n', 110 },
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83 { 'o', 111 },
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84 { 'p', 112 },
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85 { 'q', 113 },
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86 { 'r', 114 },
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87 { 's', 115 },
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88 { 't', 116 },
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89 { 'u', 117 },
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90 { 'v', 118 },
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91 { 'w', 119 },
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92 { 'x', 120 },
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93 { 'y', 121 },
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94 { 'z', 122 },
285
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95 };
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96
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97 int der_printable_char_encode(int c)
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98 {
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99 int x;
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100 for (x = 0; x < (int)(sizeof(printable_table)/sizeof(printable_table[0])); x++) {
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101 if (printable_table[x].code == c) {
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102 return printable_table[x].value;
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103 }
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104 }
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105 return -1;
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106 }
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107
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108 int der_printable_value_decode(int v)
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109 {
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110 int x;
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111 for (x = 0; x < (int)(sizeof(printable_table)/sizeof(printable_table[0])); x++) {
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112 if (printable_table[x].value == v) {
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113 return printable_table[x].code;
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114 }
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115 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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116 return -1;
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117 }
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118
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
119 /**
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120 Gets length of DER encoding of Printable STRING
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121 @param octets The values you want to encode
285
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122 @param noctets The number of octets in the string to encode
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123 @param outlen [out] The length of the DER encoding for the given string
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124 @return CRYPT_OK if successful
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Matt Johnston <matt@ucc.asn.au>
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125 */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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126 int der_length_printable_string(const unsigned char *octets, unsigned long noctets, unsigned long *outlen)
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Matt Johnston <matt@ucc.asn.au>
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127 {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
128 unsigned long x;
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129
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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130 LTC_ARGCHK(outlen != NULL);
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131 LTC_ARGCHK(octets != NULL);
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132
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133 /* scan string for validity */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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134 for (x = 0; x < noctets; x++) {
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Matt Johnston <matt@ucc.asn.au>
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135 if (der_printable_char_encode(octets[x]) == -1) {
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Matt Johnston <matt@ucc.asn.au>
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136 return CRYPT_INVALID_ARG;
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137 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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138 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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139
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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140 if (noctets < 128) {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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diff changeset
141 /* 16 LL DD DD DD ... */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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142 *outlen = 2 + noctets;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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143 } else if (noctets < 256) {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
144 /* 16 81 LL DD DD DD ... */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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145 *outlen = 3 + noctets;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146 } else if (noctets < 65536UL) {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
147 /* 16 82 LL LL DD DD DD ... */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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148 *outlen = 4 + noctets;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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149 } else if (noctets < 16777216UL) {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
150 /* 16 83 LL LL LL DD DD DD ... */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
151 *outlen = 5 + noctets;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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152 } else {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
153 return CRYPT_INVALID_ARG;
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Matt Johnston <matt@ucc.asn.au>
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154 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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155
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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157 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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158
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
159 #endif
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160
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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161
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diff changeset
162 /* ref: $Format:%D$ */
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diff changeset
163 /* git commit: $Format:%H$ */
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164 /* commit time: $Format:%ai$ */