[331] | 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/asn1t.h>
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| 13 | #include <openssl/objects.h>
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| 14 | #include "asn1_locl.h"
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| 15 |
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| 16 | static void asn1_item_embed_free(ASN1_VALUE **pval, const ASN1_ITEM *it,
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| 17 | int embed);
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| 18 |
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| 19 | /* Free up an ASN1 structure */
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| 20 |
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| 21 | void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it)
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| 22 | {
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| 23 | asn1_item_embed_free(&val, it, 0);
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| 24 | }
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| 25 |
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| 26 | void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
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| 27 | {
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| 28 | asn1_item_embed_free(pval, it, 0);
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| 29 | }
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| 30 |
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| 31 | static void asn1_item_embed_free(ASN1_VALUE **pval, const ASN1_ITEM *it,
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| 32 | int embed)
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| 33 | {
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| 34 | const ASN1_TEMPLATE *tt = NULL, *seqtt;
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| 35 | const ASN1_EXTERN_FUNCS *ef;
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| 36 | const ASN1_AUX *aux = it->funcs;
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| 37 | ASN1_aux_cb *asn1_cb;
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| 38 | int i;
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| 39 |
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| 40 | if (!pval)
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| 41 | return;
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| 42 | if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval)
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| 43 | return;
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| 44 | if (aux && aux->asn1_cb)
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| 45 | asn1_cb = aux->asn1_cb;
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| 46 | else
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| 47 | asn1_cb = 0;
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| 48 |
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| 49 | switch (it->itype) {
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| 50 |
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| 51 | case ASN1_ITYPE_PRIMITIVE:
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| 52 | if (it->templates)
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| 53 | asn1_template_free(pval, it->templates);
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| 54 | else
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| 55 | asn1_primitive_free(pval, it, embed);
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| 56 | break;
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| 57 |
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| 58 | case ASN1_ITYPE_MSTRING:
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| 59 | asn1_primitive_free(pval, it, embed);
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| 60 | break;
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| 61 |
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| 62 | case ASN1_ITYPE_CHOICE:
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| 63 | if (asn1_cb) {
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| 64 | i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
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| 65 | if (i == 2)
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| 66 | return;
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| 67 | }
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| 68 | i = asn1_get_choice_selector(pval, it);
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| 69 | if ((i >= 0) && (i < it->tcount)) {
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| 70 | ASN1_VALUE **pchval;
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| 71 |
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| 72 | tt = it->templates + i;
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| 73 | pchval = asn1_get_field_ptr(pval, tt);
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| 74 | asn1_template_free(pchval, tt);
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| 75 | }
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| 76 | if (asn1_cb)
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| 77 | asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
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| 78 | if (embed == 0) {
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| 79 | OPENSSL_free(*pval);
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| 80 | *pval = NULL;
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| 81 | }
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| 82 | break;
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| 83 |
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| 84 | case ASN1_ITYPE_EXTERN:
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| 85 | ef = it->funcs;
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| 86 | if (ef && ef->asn1_ex_free)
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| 87 | ef->asn1_ex_free(pval, it);
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| 88 | break;
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| 89 |
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| 90 | case ASN1_ITYPE_NDEF_SEQUENCE:
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| 91 | case ASN1_ITYPE_SEQUENCE:
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| 92 | if (asn1_do_lock(pval, -1, it) != 0) /* if error or ref-counter > 0 */
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| 93 | return;
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| 94 | if (asn1_cb) {
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| 95 | i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
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| 96 | if (i == 2)
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| 97 | return;
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| 98 | }
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| 99 | asn1_enc_free(pval, it);
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| 100 | /*
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| 101 | * If we free up as normal we will invalidate any ANY DEFINED BY
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| 102 | * field and we won't be able to determine the type of the field it
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| 103 | * defines. So free up in reverse order.
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| 104 | */
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| 105 | tt = it->templates + it->tcount;
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| 106 | for (i = 0; i < it->tcount; i++) {
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| 107 | ASN1_VALUE **pseqval;
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| 108 |
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| 109 | tt--;
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| 110 | seqtt = asn1_do_adb(pval, tt, 0);
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| 111 | if (!seqtt)
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| 112 | continue;
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| 113 | pseqval = asn1_get_field_ptr(pval, seqtt);
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| 114 | asn1_template_free(pseqval, seqtt);
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| 115 | }
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| 116 | if (asn1_cb)
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| 117 | asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
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| 118 | if (embed == 0) {
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| 119 | OPENSSL_free(*pval);
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| 120 | *pval = NULL;
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| 121 | }
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| 122 | break;
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| 123 | }
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| 124 | }
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| 125 |
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| 126 | void asn1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
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| 127 | {
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| 128 | int embed = tt->flags & ASN1_TFLG_EMBED;
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| 129 | ASN1_VALUE *tval;
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| 130 | if (embed) {
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| 131 | tval = (ASN1_VALUE *)pval;
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| 132 | pval = &tval;
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| 133 | }
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| 134 | if (tt->flags & ASN1_TFLG_SK_MASK) {
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| 135 | STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
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| 136 | int i;
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| 137 |
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| 138 | for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
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| 139 | ASN1_VALUE *vtmp = sk_ASN1_VALUE_value(sk, i);
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| 140 |
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| 141 | asn1_item_embed_free(&vtmp, ASN1_ITEM_ptr(tt->item), embed);
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| 142 | }
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| 143 | sk_ASN1_VALUE_free(sk);
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| 144 | *pval = NULL;
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| 145 | } else {
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| 146 | asn1_item_embed_free(pval, ASN1_ITEM_ptr(tt->item), embed);
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| 147 | }
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| 148 | }
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| 149 |
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| 150 | void asn1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int embed)
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| 151 | {
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| 152 | int utype;
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| 153 |
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| 154 | /* Special case: if 'it' is a primitive with a free_func, use that. */
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| 155 | if (it) {
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| 156 | const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
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| 157 |
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| 158 | if (pf && pf->prim_free) {
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| 159 | pf->prim_free(pval, it);
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| 160 | return;
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| 161 | }
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| 162 | }
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| 163 |
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| 164 | /* Special case: if 'it' is NULL, free contents of ASN1_TYPE */
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| 165 | if (!it) {
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| 166 | ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
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| 167 |
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| 168 | utype = typ->type;
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| 169 | pval = &typ->value.asn1_value;
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| 170 | if (!*pval)
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| 171 | return;
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| 172 | } else if (it->itype == ASN1_ITYPE_MSTRING) {
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| 173 | utype = -1;
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| 174 | if (!*pval)
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| 175 | return;
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| 176 | } else {
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| 177 | utype = it->utype;
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| 178 | if ((utype != V_ASN1_BOOLEAN) && !*pval)
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| 179 | return;
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| 180 | }
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| 181 |
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| 182 | switch (utype) {
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| 183 | case V_ASN1_OBJECT:
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| 184 | ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
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| 185 | break;
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| 186 |
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| 187 | case V_ASN1_BOOLEAN:
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| 188 | if (it)
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| 189 | *(ASN1_BOOLEAN *)pval = it->size;
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| 190 | else
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| 191 | *(ASN1_BOOLEAN *)pval = -1;
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| 192 | return;
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| 193 |
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| 194 | case V_ASN1_NULL:
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| 195 | break;
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| 196 |
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| 197 | case V_ASN1_ANY:
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| 198 | asn1_primitive_free(pval, NULL, 0);
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| 199 | OPENSSL_free(*pval);
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| 200 | break;
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| 201 |
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| 202 | default:
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| 203 | asn1_string_embed_free((ASN1_STRING *)*pval, embed);
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| 204 | break;
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| 205 | }
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| 206 | *pval = NULL;
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| 207 | }
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