Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/sequence/der_encode_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_encode_sequence_multi.c |
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15 ASN.1 DER, encode 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 Encode a SEQUENCE type using a VA list |
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22 @param out [out] Destination for data |
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23 @param outlen [in/out] Length of buffer and resulting length of output |
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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_encode_sequence_multi(unsigned char *out, unsigned long *outlen, ...) |
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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(out != NULL); |
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37 LTC_ARGCHK(outlen != NULL); |
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38 |
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39 /* get size of output that will be required */ |
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40 va_start(args, outlen); |
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41 x = 0; |
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42 for (;;) { |
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43 type = (ltc_asn1_type)va_arg(args, int); |
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44 size = va_arg(args, unsigned long); |
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45 data = va_arg(args, void*); |
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46 LTC_UNUSED_PARAM(size); |
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47 LTC_UNUSED_PARAM(data); |
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48 |
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49 if (type == LTC_ASN1_EOL) { |
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50 break; |
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51 } |
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52 |
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53 switch (type) { |
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54 case LTC_ASN1_BOOLEAN: |
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55 case LTC_ASN1_INTEGER: |
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56 case LTC_ASN1_SHORT_INTEGER: |
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57 case LTC_ASN1_BIT_STRING: |
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58 case LTC_ASN1_OCTET_STRING: |
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59 case LTC_ASN1_NULL: |
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60 case LTC_ASN1_OBJECT_IDENTIFIER: |
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61 case LTC_ASN1_IA5_STRING: |
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62 case LTC_ASN1_PRINTABLE_STRING: |
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63 case LTC_ASN1_UTF8_STRING: |
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64 case LTC_ASN1_UTCTIME: |
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65 case LTC_ASN1_SEQUENCE: |
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66 case LTC_ASN1_SET: |
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67 case LTC_ASN1_SETOF: |
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68 case LTC_ASN1_RAW_BIT_STRING: |
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69 case LTC_ASN1_GENERALIZEDTIME: |
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70 ++x; |
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71 break; |
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72 |
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73 case LTC_ASN1_CHOICE: |
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74 case LTC_ASN1_CONSTRUCTED: |
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75 case LTC_ASN1_CONTEXT_SPECIFIC: |
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76 case LTC_ASN1_EOL: |
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77 case LTC_ASN1_TELETEX_STRING: |
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78 va_end(args); |
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79 return CRYPT_INVALID_ARG; |
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80 } |
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81 } |
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82 va_end(args); |
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83 |
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
84 /* allocate structure for x elements */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
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85 if (x == 0) { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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86 return CRYPT_NOP; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
87 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
88 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
89 list = XCALLOC(sizeof(*list), x); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
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90 if (list == NULL) { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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91 return CRYPT_MEM; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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92 } |
1b9e69c058d2
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parents:
diff
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93 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
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94 /* fill in the structure */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
95 va_start(args, outlen); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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96 x = 0; |
1b9e69c058d2
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97 for (;;) { |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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98 type = (ltc_asn1_type)va_arg(args, int); |
285
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99 size = va_arg(args, unsigned long); |
1b9e69c058d2
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100 data = va_arg(args, void*); |
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101 |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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102 if (type == LTC_ASN1_EOL) { |
285
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parents:
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103 break; |
1b9e69c058d2
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parents:
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104 } |
1b9e69c058d2
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parents:
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105 |
1b9e69c058d2
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parents:
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106 switch (type) { |
382
0cbe8f6dbf9e
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285
diff
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107 case LTC_ASN1_BOOLEAN: |
285
1b9e69c058d2
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108 case LTC_ASN1_INTEGER: |
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parents:
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109 case LTC_ASN1_SHORT_INTEGER: |
1b9e69c058d2
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parents:
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110 case LTC_ASN1_BIT_STRING: |
1b9e69c058d2
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parents:
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111 case LTC_ASN1_OCTET_STRING: |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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112 case LTC_ASN1_NULL: |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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113 case LTC_ASN1_OBJECT_IDENTIFIER: |
1b9e69c058d2
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parents:
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114 case LTC_ASN1_IA5_STRING: |
1b9e69c058d2
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parents:
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115 case LTC_ASN1_PRINTABLE_STRING: |
382
0cbe8f6dbf9e
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parents:
285
diff
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|
116 case LTC_ASN1_UTF8_STRING: |
285
1b9e69c058d2
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parents:
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117 case LTC_ASN1_UTCTIME: |
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parents:
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118 case LTC_ASN1_SEQUENCE: |
382
0cbe8f6dbf9e
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285
diff
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119 case LTC_ASN1_SET: |
0cbe8f6dbf9e
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285
diff
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120 case LTC_ASN1_SETOF: |
1471
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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1435
diff
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121 case LTC_ASN1_RAW_BIT_STRING: |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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122 case LTC_ASN1_GENERALIZEDTIME: |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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123 LTC_SET_ASN1(list, x++, type, data, size); |
285
1b9e69c058d2
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parents:
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124 break; |
1471
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
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diff
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|
125 |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
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diff
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|
126 case LTC_ASN1_CHOICE: |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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127 case LTC_ASN1_CONSTRUCTED: |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
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128 case LTC_ASN1_CONTEXT_SPECIFIC: |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
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diff
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129 case LTC_ASN1_EOL: |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
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diff
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|
130 case LTC_ASN1_TELETEX_STRING: |
285
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
131 va_end(args); |
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parents:
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|
132 err = CRYPT_INVALID_ARG; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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133 goto LBL_ERR; |
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Matt Johnston <matt@ucc.asn.au>
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|
134 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
135 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
136 va_end(args); |
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
137 |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
138 err = der_encode_sequence(list, x, out, outlen); |
285
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
139 LBL_ERR: |
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
140 XFREE(list); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
141 return err; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
142 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
143 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
144 #endif |
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
145 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
146 |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
147 /* ref: $Format:%D$ */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
148 /* git commit: $Format:%H$ */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
149 /* commit time: $Format:%ai$ */ |