Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/sequence/der_decode_sequence_multi.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 | 6dba84798cd5 |
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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 #include <stdarg.h> |
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11 |
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12 |
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13 /** |
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14 @file der_decode_sequence_multi.c |
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15 ASN.1 DER, decode a SEQUENCE, Tom St Denis |
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16 */ |
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17 |
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18 #ifdef LTC_DER |
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19 |
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20 /** |
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21 Decode a SEQUENCE type using a VA list |
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22 @param in Input buffer |
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23 @param inlen Length of input in octets |
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24 @remark <...> is of the form <type, size, data> (int, unsigned long, void*) |
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25 @return CRYPT_OK on success |
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26 */ |
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27 int der_decode_sequence_multi(const unsigned char *in, unsigned long inlen, ...) |
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28 { |
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29 int err; |
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30 ltc_asn1_type type; |
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31 unsigned long size, x; |
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32 void *data; |
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33 va_list args; |
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34 ltc_asn1_list *list; |
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35 |
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36 LTC_ARGCHK(in != NULL); |
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37 |
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38 /* get size of output that will be required */ |
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39 va_start(args, inlen); |
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40 x = 0; |
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41 for (;;) { |
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42 type = (ltc_asn1_type)va_arg(args, int); |
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43 size = va_arg(args, unsigned long); |
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44 data = va_arg(args, void*); |
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45 LTC_UNUSED_PARAM(size); |
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46 LTC_UNUSED_PARAM(data); |
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47 |
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48 if (type == LTC_ASN1_EOL) { |
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49 break; |
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50 } |
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51 |
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52 switch (type) { |
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53 case LTC_ASN1_BOOLEAN: |
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54 case LTC_ASN1_INTEGER: |
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55 case LTC_ASN1_SHORT_INTEGER: |
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56 case LTC_ASN1_BIT_STRING: |
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57 case LTC_ASN1_OCTET_STRING: |
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58 case LTC_ASN1_NULL: |
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59 case LTC_ASN1_OBJECT_IDENTIFIER: |
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60 case LTC_ASN1_IA5_STRING: |
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61 case LTC_ASN1_PRINTABLE_STRING: |
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62 case LTC_ASN1_UTF8_STRING: |
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63 case LTC_ASN1_UTCTIME: |
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64 case LTC_ASN1_SET: |
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65 case LTC_ASN1_SETOF: |
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66 case LTC_ASN1_SEQUENCE: |
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67 case LTC_ASN1_CHOICE: |
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68 case LTC_ASN1_RAW_BIT_STRING: |
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69 case LTC_ASN1_TELETEX_STRING: |
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70 case LTC_ASN1_GENERALIZEDTIME: |
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71 ++x; |
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72 break; |
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73 |
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74 case LTC_ASN1_EOL: |
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75 case LTC_ASN1_CONSTRUCTED: |
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76 case LTC_ASN1_CONTEXT_SPECIFIC: |
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77 va_end(args); |
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78 return CRYPT_INVALID_ARG; |
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79 } |
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80 } |
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81 va_end(args); |
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82 |
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83 /* allocate structure for x elements */ |
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84 if (x == 0) { |
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85 return CRYPT_NOP; |
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86 } |
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87 |
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88 list = XCALLOC(sizeof(*list), x); |
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89 if (list == NULL) { |
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90 return CRYPT_MEM; |
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91 } |
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92 |
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93 /* fill in the structure */ |
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94 va_start(args, inlen); |
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95 x = 0; |
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96 for (;;) { |
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97 type = (ltc_asn1_type)va_arg(args, int); |
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98 size = va_arg(args, unsigned long); |
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99 data = va_arg(args, void*); |
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100 |
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101 if (type == LTC_ASN1_EOL) { |
285
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102 break; |
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103 } |
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104 |
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105 switch (type) { |
382
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106 case LTC_ASN1_BOOLEAN: |
285
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107 case LTC_ASN1_INTEGER: |
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108 case LTC_ASN1_SHORT_INTEGER: |
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109 case LTC_ASN1_BIT_STRING: |
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110 case LTC_ASN1_OCTET_STRING: |
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111 case LTC_ASN1_NULL: |
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112 case LTC_ASN1_OBJECT_IDENTIFIER: |
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113 case LTC_ASN1_IA5_STRING: |
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114 case LTC_ASN1_PRINTABLE_STRING: |
382
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115 case LTC_ASN1_UTF8_STRING: |
285
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116 case LTC_ASN1_UTCTIME: |
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117 case LTC_ASN1_SEQUENCE: |
382
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118 case LTC_ASN1_SET: |
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119 case LTC_ASN1_SETOF: |
285
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120 case LTC_ASN1_CHOICE: |
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121 case LTC_ASN1_RAW_BIT_STRING: |
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122 case LTC_ASN1_TELETEX_STRING: |
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123 case LTC_ASN1_GENERALIZEDTIME: |
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124 LTC_SET_ASN1(list, x++, type, data, size); |
285
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125 break; |
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126 /* coverity[dead_error_line] */ |
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127 case LTC_ASN1_EOL: |
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128 case LTC_ASN1_CONSTRUCTED: |
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129 case LTC_ASN1_CONTEXT_SPECIFIC: |
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130 break; |
285
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131 } |
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132 } |
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133 va_end(args); |
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134 |
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135 err = der_decode_sequence(in, inlen, list, x); |
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136 XFREE(list); |
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137 return err; |
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138 } |
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139 |
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140 #endif |
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141 |
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142 |
1471
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143 /* ref: $Format:%D$ */ |
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144 /* git commit: $Format:%H$ */ |
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145 /* commit time: $Format:%ai$ */ |