1/*
2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include "internal/cryptlib.h"
12#include <openssl/asn1t.h>
13#include <openssl/x509.h>
14#include "crypto/x509.h"
15
16/*-
17 * X509_REQ_INFO is handled in an unusual way to get round
18 * invalid encodings. Some broken certificate requests don't
19 * encode the attributes field if it is empty. This is in
20 * violation of PKCS#10 but we need to tolerate it. We do
21 * this by making the attributes field OPTIONAL then using
22 * the callback to initialise it to an empty STACK.
23 *
24 * This means that the field will be correctly encoded unless
25 * we NULL out the field.
26 *
27 * As a result we no longer need the req_kludge field because
28 * the information is now contained in the attributes field:
29 * 1. If it is NULL then it's the invalid omission.
30 * 2. If it is empty it is the correct encoding.
31 * 3. If it is not empty then some attributes are present.
32 *
33 */
34
35static int rinf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
36                   void *exarg)
37{
38    X509_REQ_INFO *rinf = (X509_REQ_INFO *)*pval;
39
40    if (operation == ASN1_OP_NEW_POST) {
41        rinf->attributes = sk_X509_ATTRIBUTE_new_null();
42        if (!rinf->attributes)
43            return 0;
44    }
45    return 1;
46}
47
48ASN1_SEQUENCE_enc(X509_REQ_INFO, enc, rinf_cb) = {
49        ASN1_SIMPLE(X509_REQ_INFO, version, ASN1_INTEGER),
50        ASN1_SIMPLE(X509_REQ_INFO, subject, X509_NAME),
51        ASN1_SIMPLE(X509_REQ_INFO, pubkey, X509_PUBKEY),
52        /* This isn't really OPTIONAL but it gets round invalid
53         * encodings
54         */
55        ASN1_IMP_SET_OF_OPT(X509_REQ_INFO, attributes, X509_ATTRIBUTE, 0)
56} ASN1_SEQUENCE_END_enc(X509_REQ_INFO, X509_REQ_INFO)
57
58IMPLEMENT_ASN1_FUNCTIONS(X509_REQ_INFO)
59
60ASN1_SEQUENCE_ref(X509_REQ, 0) = {
61        ASN1_EMBED(X509_REQ, req_info, X509_REQ_INFO),
62        ASN1_EMBED(X509_REQ, sig_alg, X509_ALGOR),
63        ASN1_SIMPLE(X509_REQ, signature, ASN1_BIT_STRING)
64} ASN1_SEQUENCE_END_ref(X509_REQ, X509_REQ)
65
66IMPLEMENT_ASN1_FUNCTIONS(X509_REQ)
67
68IMPLEMENT_ASN1_DUP_FUNCTION(X509_REQ)
69