[331] | 1 | /*
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| 2 | * Copyright 1995-2016 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 <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/evp.h>
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| 13 | #include <openssl/asn1t.h>
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| 14 | #include <openssl/x509.h>
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| 15 | #include <openssl/x509v3.h>
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| 16 | #include "internal/x509_int.h"
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| 17 |
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| 18 | ASN1_SEQUENCE_enc(X509_CINF, enc, 0) = {
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| 19 | ASN1_EXP_OPT(X509_CINF, version, ASN1_INTEGER, 0),
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| 20 | ASN1_EMBED(X509_CINF, serialNumber, ASN1_INTEGER),
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| 21 | ASN1_EMBED(X509_CINF, signature, X509_ALGOR),
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| 22 | ASN1_SIMPLE(X509_CINF, issuer, X509_NAME),
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| 23 | ASN1_EMBED(X509_CINF, validity, X509_VAL),
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| 24 | ASN1_SIMPLE(X509_CINF, subject, X509_NAME),
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| 25 | ASN1_SIMPLE(X509_CINF, key, X509_PUBKEY),
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| 26 | ASN1_IMP_OPT(X509_CINF, issuerUID, ASN1_BIT_STRING, 1),
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| 27 | ASN1_IMP_OPT(X509_CINF, subjectUID, ASN1_BIT_STRING, 2),
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| 28 | ASN1_EXP_SEQUENCE_OF_OPT(X509_CINF, extensions, X509_EXTENSION, 3)
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| 29 | } ASN1_SEQUENCE_END_enc(X509_CINF, X509_CINF)
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| 30 |
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| 31 | IMPLEMENT_ASN1_FUNCTIONS(X509_CINF)
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| 32 | /* X509 top level structure needs a bit of customisation */
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| 33 |
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| 34 | extern void policy_cache_free(X509_POLICY_CACHE *cache);
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| 35 |
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| 36 | static int x509_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
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| 37 | void *exarg)
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| 38 | {
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| 39 | X509 *ret = (X509 *)*pval;
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| 40 |
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| 41 | switch (operation) {
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| 42 |
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| 43 | case ASN1_OP_NEW_POST:
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| 44 | ret->ex_flags = 0;
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| 45 | ret->ex_pathlen = -1;
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| 46 | ret->ex_pcpathlen = -1;
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| 47 | ret->skid = NULL;
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| 48 | ret->akid = NULL;
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| 49 | #ifndef OPENSSL_NO_RFC3779
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| 50 | ret->rfc3779_addr = NULL;
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| 51 | ret->rfc3779_asid = NULL;
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| 52 | #endif
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| 53 | ret->aux = NULL;
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| 54 | ret->crldp = NULL;
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| 55 | if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509, ret, &ret->ex_data))
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| 56 | return 0;
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| 57 | break;
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| 58 |
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| 59 | case ASN1_OP_FREE_POST:
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| 60 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509, ret, &ret->ex_data);
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| 61 | X509_CERT_AUX_free(ret->aux);
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| 62 | ASN1_OCTET_STRING_free(ret->skid);
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| 63 | AUTHORITY_KEYID_free(ret->akid);
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| 64 | CRL_DIST_POINTS_free(ret->crldp);
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| 65 | policy_cache_free(ret->policy_cache);
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| 66 | GENERAL_NAMES_free(ret->altname);
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| 67 | NAME_CONSTRAINTS_free(ret->nc);
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| 68 | #ifndef OPENSSL_NO_RFC3779
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| 69 | sk_IPAddressFamily_pop_free(ret->rfc3779_addr, IPAddressFamily_free);
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| 70 | ASIdentifiers_free(ret->rfc3779_asid);
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| 71 | #endif
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| 72 | break;
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| 73 |
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| 74 | }
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| 75 |
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| 76 | return 1;
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| 77 |
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| 78 | }
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| 79 |
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| 80 | ASN1_SEQUENCE_ref(X509, x509_cb) = {
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| 81 | ASN1_EMBED(X509, cert_info, X509_CINF),
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| 82 | ASN1_EMBED(X509, sig_alg, X509_ALGOR),
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| 83 | ASN1_EMBED(X509, signature, ASN1_BIT_STRING)
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| 84 | } ASN1_SEQUENCE_END_ref(X509, X509)
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| 85 |
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| 86 | IMPLEMENT_ASN1_FUNCTIONS(X509)
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| 87 |
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| 88 | IMPLEMENT_ASN1_DUP_FUNCTION(X509)
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| 89 |
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| 90 | int X509_set_ex_data(X509 *r, int idx, void *arg)
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| 91 | {
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| 92 | return (CRYPTO_set_ex_data(&r->ex_data, idx, arg));
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| 93 | }
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| 94 |
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| 95 | void *X509_get_ex_data(X509 *r, int idx)
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| 96 | {
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| 97 | return (CRYPTO_get_ex_data(&r->ex_data, idx));
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| 98 | }
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| 99 |
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| 100 | /*
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| 101 | * X509_AUX ASN1 routines. X509_AUX is the name given to a certificate with
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| 102 | * extra info tagged on the end. Since these functions set how a certificate
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| 103 | * is trusted they should only be used when the certificate comes from a
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| 104 | * reliable source such as local storage.
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| 105 | */
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| 106 |
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| 107 | X509 *d2i_X509_AUX(X509 **a, const unsigned char **pp, long length)
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| 108 | {
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| 109 | const unsigned char *q;
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| 110 | X509 *ret;
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| 111 | int freeret = 0;
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| 112 |
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| 113 | /* Save start position */
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| 114 | q = *pp;
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| 115 |
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| 116 | if (a == NULL || *a == NULL)
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| 117 | freeret = 1;
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| 118 | ret = d2i_X509(a, &q, length);
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| 119 | /* If certificate unreadable then forget it */
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| 120 | if (ret == NULL)
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| 121 | return NULL;
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| 122 | /* update length */
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| 123 | length -= q - *pp;
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| 124 | if (length > 0 && !d2i_X509_CERT_AUX(&ret->aux, &q, length))
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| 125 | goto err;
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| 126 | *pp = q;
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| 127 | return ret;
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| 128 | err:
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| 129 | if (freeret) {
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| 130 | X509_free(ret);
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| 131 | if (a)
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| 132 | *a = NULL;
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| 133 | }
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| 134 | return NULL;
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| 135 | }
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| 136 |
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| 137 | /*
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| 138 | * Serialize trusted certificate to *pp or just return the required buffer
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| 139 | * length if pp == NULL. We ultimately want to avoid modifying *pp in the
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| 140 | * error path, but that depends on similar hygiene in lower-level functions.
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| 141 | * Here we avoid compounding the problem.
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| 142 | */
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| 143 | static int i2d_x509_aux_internal(X509 *a, unsigned char **pp)
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| 144 | {
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| 145 | int length, tmplen;
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| 146 | unsigned char *start = pp != NULL ? *pp : NULL;
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| 147 |
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| 148 | OPENSSL_assert(pp == NULL || *pp != NULL);
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| 149 |
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| 150 | /*
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| 151 | * This might perturb *pp on error, but fixing that belongs in i2d_X509()
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| 152 | * not here. It should be that if a == NULL length is zero, but we check
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| 153 | * both just in case.
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| 154 | */
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| 155 | length = i2d_X509(a, pp);
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| 156 | if (length <= 0 || a == NULL)
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| 157 | return length;
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| 158 |
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| 159 | tmplen = i2d_X509_CERT_AUX(a->aux, pp);
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| 160 | if (tmplen < 0) {
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| 161 | if (start != NULL)
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| 162 | *pp = start;
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| 163 | return tmplen;
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| 164 | }
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| 165 | length += tmplen;
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| 166 |
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| 167 | return length;
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| 168 | }
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| 169 |
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| 170 | /*
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| 171 | * Serialize trusted certificate to *pp, or just return the required buffer
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| 172 | * length if pp == NULL.
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| 173 | *
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| 174 | * When pp is not NULL, but *pp == NULL, we allocate the buffer, but since
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| 175 | * we're writing two ASN.1 objects back to back, we can't have i2d_X509() do
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| 176 | * the allocation, nor can we allow i2d_X509_CERT_AUX() to increment the
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| 177 | * allocated buffer.
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| 178 | */
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| 179 | int i2d_X509_AUX(X509 *a, unsigned char **pp)
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| 180 | {
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| 181 | int length;
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| 182 | unsigned char *tmp;
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| 183 |
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| 184 | /* Buffer provided by caller */
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| 185 | if (pp == NULL || *pp != NULL)
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| 186 | return i2d_x509_aux_internal(a, pp);
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| 187 |
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| 188 | /* Obtain the combined length */
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| 189 | if ((length = i2d_x509_aux_internal(a, NULL)) <= 0)
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| 190 | return length;
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| 191 |
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| 192 | /* Allocate requisite combined storage */
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| 193 | *pp = tmp = OPENSSL_malloc(length);
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| 194 | if (tmp == NULL)
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| 195 | return -1; /* Push error onto error stack? */
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| 196 |
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| 197 | /* Encode, but keep *pp at the originally malloced pointer */
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| 198 | length = i2d_x509_aux_internal(a, &tmp);
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| 199 | if (length <= 0) {
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| 200 | OPENSSL_free(*pp);
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| 201 | *pp = NULL;
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| 202 | }
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| 203 | return length;
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| 204 | }
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| 205 |
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| 206 | int i2d_re_X509_tbs(X509 *x, unsigned char **pp)
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| 207 | {
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| 208 | x->cert_info.enc.modified = 1;
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| 209 | return i2d_X509_CINF(&x->cert_info, pp);
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| 210 | }
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| 211 |
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| 212 | void X509_get0_signature(const ASN1_BIT_STRING **psig,
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| 213 | const X509_ALGOR **palg, const X509 *x)
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| 214 | {
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| 215 | if (psig)
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| 216 | *psig = &x->signature;
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| 217 | if (palg)
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| 218 | *palg = &x->sig_alg;
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| 219 | }
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| 220 |
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| 221 | int X509_get_signature_nid(const X509 *x)
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| 222 | {
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| 223 | return OBJ_obj2nid(x->sig_alg.algorithm);
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| 224 | }
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