1 | /*
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2 | * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | #include <stddef.h>
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11 | #include <openssl/asn1.h>
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12 | #include <openssl/objects.h>
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13 | #include <openssl/err.h>
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14 | #include <openssl/asn1t.h>
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15 | #include <string.h>
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16 | #include "asn1_locl.h"
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17 |
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18 | static int asn1_item_embed_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
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19 | int embed);
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20 | static int asn1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
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21 | int embed);
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22 | static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
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23 | static int asn1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);
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24 | static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);
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25 | static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
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26 |
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27 | ASN1_VALUE *ASN1_item_new(const ASN1_ITEM *it)
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28 | {
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29 | ASN1_VALUE *ret = NULL;
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30 | if (ASN1_item_ex_new(&ret, it) > 0)
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31 | return ret;
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32 | return NULL;
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33 | }
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34 |
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35 | /* Allocate an ASN1 structure */
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36 |
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37 | int ASN1_item_ex_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
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38 | {
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39 | return asn1_item_embed_new(pval, it, 0);
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40 | }
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41 |
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42 | int asn1_item_embed_new(ASN1_VALUE **pval, const ASN1_ITEM *it, int embed)
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43 | {
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44 | const ASN1_TEMPLATE *tt = NULL;
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45 | const ASN1_EXTERN_FUNCS *ef;
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46 | const ASN1_AUX *aux = it->funcs;
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47 | ASN1_aux_cb *asn1_cb;
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48 | ASN1_VALUE **pseqval;
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49 | int i;
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50 | if (aux && aux->asn1_cb)
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51 | asn1_cb = aux->asn1_cb;
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52 | else
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53 | asn1_cb = 0;
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54 |
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55 | #ifndef OPENSSL_NO_CRYPTO_MDEBUG
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56 | OPENSSL_mem_debug_push(it->sname ? it->sname : "asn1_item_embed_new");
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57 | #endif
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58 |
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59 | switch (it->itype) {
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60 |
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61 | case ASN1_ITYPE_EXTERN:
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62 | ef = it->funcs;
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63 | if (ef && ef->asn1_ex_new) {
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64 | if (!ef->asn1_ex_new(pval, it))
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65 | goto memerr;
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66 | }
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67 | break;
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68 |
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69 | case ASN1_ITYPE_PRIMITIVE:
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70 | if (it->templates) {
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71 | if (!asn1_template_new(pval, it->templates))
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72 | goto memerr;
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73 | } else if (!asn1_primitive_new(pval, it, embed))
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74 | goto memerr;
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75 | break;
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76 |
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77 | case ASN1_ITYPE_MSTRING:
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78 | if (!asn1_primitive_new(pval, it, embed))
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79 | goto memerr;
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80 | break;
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81 |
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82 | case ASN1_ITYPE_CHOICE:
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83 | if (asn1_cb) {
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84 | i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);
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85 | if (!i)
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86 | goto auxerr;
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87 | if (i == 2) {
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88 | #ifndef OPENSSL_NO_CRYPTO_MDEBUG
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89 | OPENSSL_mem_debug_pop();
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90 | #endif
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91 | return 1;
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92 | }
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93 | }
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94 | if (embed) {
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95 | memset(*pval, 0, it->size);
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96 | } else {
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97 | *pval = OPENSSL_zalloc(it->size);
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98 | if (*pval == NULL)
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99 | goto memerr;
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100 | }
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101 | asn1_set_choice_selector(pval, -1, it);
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102 | if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
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103 | goto auxerr2;
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104 | break;
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105 |
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106 | case ASN1_ITYPE_NDEF_SEQUENCE:
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107 | case ASN1_ITYPE_SEQUENCE:
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108 | if (asn1_cb) {
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109 | i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);
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110 | if (!i)
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111 | goto auxerr;
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112 | if (i == 2) {
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113 | #ifndef OPENSSL_NO_CRYPTO_MDEBUG
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114 | OPENSSL_mem_debug_pop();
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115 | #endif
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116 | return 1;
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117 | }
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118 | }
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119 | if (embed) {
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120 | memset(*pval, 0, it->size);
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121 | } else {
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122 | *pval = OPENSSL_zalloc(it->size);
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123 | if (*pval == NULL)
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124 | goto memerr;
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125 | }
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126 | /* 0 : init. lock */
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127 | if (asn1_do_lock(pval, 0, it) < 0)
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128 | goto memerr2;
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129 | asn1_enc_init(pval, it);
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130 | for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
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131 | pseqval = asn1_get_field_ptr(pval, tt);
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132 | if (!asn1_template_new(pseqval, tt))
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133 | goto memerr2;
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134 | }
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135 | if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
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136 | goto auxerr2;
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137 | break;
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138 | }
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139 | #ifndef OPENSSL_NO_CRYPTO_MDEBUG
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140 | OPENSSL_mem_debug_pop();
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141 | #endif
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142 | return 1;
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143 |
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144 | memerr2:
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145 | ASN1_item_ex_free(pval, it);
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146 | memerr:
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147 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_NEW, ERR_R_MALLOC_FAILURE);
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148 | #ifndef OPENSSL_NO_CRYPTO_MDEBUG
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149 | OPENSSL_mem_debug_pop();
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150 | #endif
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151 | return 0;
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152 |
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153 | auxerr2:
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154 | ASN1_item_ex_free(pval, it);
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155 | auxerr:
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156 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_NEW, ASN1_R_AUX_ERROR);
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157 | #ifndef OPENSSL_NO_CRYPTO_MDEBUG
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158 | OPENSSL_mem_debug_pop();
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159 | #endif
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160 | return 0;
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161 |
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162 | }
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163 |
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164 | static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
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165 | {
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166 | const ASN1_EXTERN_FUNCS *ef;
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167 |
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168 | switch (it->itype) {
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169 |
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170 | case ASN1_ITYPE_EXTERN:
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171 | ef = it->funcs;
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172 | if (ef && ef->asn1_ex_clear)
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173 | ef->asn1_ex_clear(pval, it);
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174 | else
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175 | *pval = NULL;
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176 | break;
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177 |
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178 | case ASN1_ITYPE_PRIMITIVE:
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179 | if (it->templates)
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180 | asn1_template_clear(pval, it->templates);
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181 | else
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182 | asn1_primitive_clear(pval, it);
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183 | break;
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184 |
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185 | case ASN1_ITYPE_MSTRING:
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186 | asn1_primitive_clear(pval, it);
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187 | break;
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188 |
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189 | case ASN1_ITYPE_CHOICE:
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190 | case ASN1_ITYPE_SEQUENCE:
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191 | case ASN1_ITYPE_NDEF_SEQUENCE:
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192 | *pval = NULL;
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193 | break;
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194 | }
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195 | }
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196 |
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197 | static int asn1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
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198 | {
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199 | const ASN1_ITEM *it = ASN1_ITEM_ptr(tt->item);
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200 | int embed = tt->flags & ASN1_TFLG_EMBED;
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201 | ASN1_VALUE *tval;
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202 | int ret;
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203 | if (embed) {
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204 | tval = (ASN1_VALUE *)pval;
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205 | pval = &tval;
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206 | }
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207 | if (tt->flags & ASN1_TFLG_OPTIONAL) {
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208 | asn1_template_clear(pval, tt);
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209 | return 1;
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210 | }
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211 | /* If ANY DEFINED BY nothing to do */
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212 |
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213 | if (tt->flags & ASN1_TFLG_ADB_MASK) {
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214 | *pval = NULL;
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215 | return 1;
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216 | }
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217 | #ifndef OPENSSL_NO_CRYPTO_MDEBUG
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218 | OPENSSL_mem_debug_push(tt->field_name
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219 | ? tt->field_name : "asn1_template_new");
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220 | #endif
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221 | /* If SET OF or SEQUENCE OF, its a STACK */
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222 | if (tt->flags & ASN1_TFLG_SK_MASK) {
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223 | STACK_OF(ASN1_VALUE) *skval;
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224 | skval = sk_ASN1_VALUE_new_null();
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225 | if (!skval) {
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226 | ASN1err(ASN1_F_ASN1_TEMPLATE_NEW, ERR_R_MALLOC_FAILURE);
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227 | ret = 0;
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228 | goto done;
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229 | }
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230 | *pval = (ASN1_VALUE *)skval;
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231 | ret = 1;
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232 | goto done;
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233 | }
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234 | /* Otherwise pass it back to the item routine */
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235 | ret = asn1_item_embed_new(pval, it, embed);
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236 | done:
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237 | #ifndef OPENSSL_NO_CRYPTO_MDEBUG
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238 | OPENSSL_mem_debug_pop();
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239 | #endif
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240 | return ret;
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241 | }
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242 |
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243 | static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
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244 | {
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245 | /* If ADB or STACK just NULL the field */
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246 | if (tt->flags & (ASN1_TFLG_ADB_MASK | ASN1_TFLG_SK_MASK))
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247 | *pval = NULL;
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248 | else
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249 | asn1_item_clear(pval, ASN1_ITEM_ptr(tt->item));
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250 | }
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251 |
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252 | /*
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253 | * NB: could probably combine most of the real XXX_new() behaviour and junk
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254 | * all the old functions.
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255 | */
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256 |
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257 | static int asn1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
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258 | int embed)
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259 | {
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260 | ASN1_TYPE *typ;
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261 | ASN1_STRING *str;
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262 | int utype;
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263 |
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264 | if (!it)
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265 | return 0;
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266 |
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267 | if (it->funcs) {
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268 | const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
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269 | if (pf->prim_new)
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270 | return pf->prim_new(pval, it);
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271 | }
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272 |
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273 | if (it->itype == ASN1_ITYPE_MSTRING)
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274 | utype = -1;
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275 | else
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276 | utype = it->utype;
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277 | switch (utype) {
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278 | case V_ASN1_OBJECT:
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279 | *pval = (ASN1_VALUE *)OBJ_nid2obj(NID_undef);
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280 | return 1;
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281 |
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282 | case V_ASN1_BOOLEAN:
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283 | *(ASN1_BOOLEAN *)pval = it->size;
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284 | return 1;
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285 |
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286 | case V_ASN1_NULL:
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287 | *pval = (ASN1_VALUE *)1;
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288 | return 1;
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289 |
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290 | case V_ASN1_ANY:
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291 | typ = OPENSSL_malloc(sizeof(*typ));
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292 | if (typ == NULL)
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293 | return 0;
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294 | typ->value.ptr = NULL;
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295 | typ->type = -1;
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296 | *pval = (ASN1_VALUE *)typ;
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297 | break;
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298 |
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299 | default:
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300 | if (embed) {
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301 | str = *(ASN1_STRING **)pval;
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302 | memset(str, 0, sizeof(*str));
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303 | str->type = utype;
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304 | str->flags = ASN1_STRING_FLAG_EMBED;
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305 | } else {
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306 | str = ASN1_STRING_type_new(utype);
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307 | *pval = (ASN1_VALUE *)str;
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308 | }
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309 | if (it->itype == ASN1_ITYPE_MSTRING && str)
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310 | str->flags |= ASN1_STRING_FLAG_MSTRING;
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311 | break;
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312 | }
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313 | if (*pval)
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314 | return 1;
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315 | return 0;
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316 | }
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317 |
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318 | static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
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319 | {
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320 | int utype;
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321 | if (it && it->funcs) {
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322 | const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
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323 | if (pf->prim_clear)
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324 | pf->prim_clear(pval, it);
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325 | else
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326 | *pval = NULL;
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327 | return;
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328 | }
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329 | if (!it || (it->itype == ASN1_ITYPE_MSTRING))
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330 | utype = -1;
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331 | else
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332 | utype = it->utype;
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333 | if (utype == V_ASN1_BOOLEAN)
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334 | *(ASN1_BOOLEAN *)pval = it->size;
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335 | else
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336 | *pval = NULL;
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337 | }
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