crypto/x509/x_req.c

   1 /*
   2  * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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
  35 static 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
  48 static int req_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
  49                   void *exarg)
  50 {
  51 #ifndef OPENSSL_NO_SM2
  52     X509_REQ *ret = (X509_REQ *)*pval;
  53
  54     switch (operation) {
  55     case ASN1_OP_D2I_PRE:
  56         ASN1_OCTET_STRING_free(ret->distinguishing_id);
  57         /* fall thru */
  58     case ASN1_OP_NEW_POST:
  59         ret->distinguishing_id = NULL;
  60         break;
  61
  62     case ASN1_OP_FREE_POST:
  63         ASN1_OCTET_STRING_free(ret->distinguishing_id);
  64         break;
  65     }
  66 #endif
  67
  68     return 1;
  69 }
  70
  71 ASN1_SEQUENCE_enc(X509_REQ_INFO, enc, rinf_cb) = {
  72         ASN1_SIMPLE(X509_REQ_INFO, version, ASN1_INTEGER),
  73         ASN1_SIMPLE(X509_REQ_INFO, subject, X509_NAME),
  74         ASN1_SIMPLE(X509_REQ_INFO, pubkey, X509_PUBKEY),
  75         /* This isn't really OPTIONAL but it gets round invalid
  76          * encodings
  77          */
  78         ASN1_IMP_SET_OF_OPT(X509_REQ_INFO, attributes, X509_ATTRIBUTE, 0)
  79 } ASN1_SEQUENCE_END_enc(X509_REQ_INFO, X509_REQ_INFO)
  80
  81 IMPLEMENT_ASN1_FUNCTIONS(X509_REQ_INFO)
  82
  83 ASN1_SEQUENCE_ref(X509_REQ, req_cb) = {
  84         ASN1_EMBED(X509_REQ, req_info, X509_REQ_INFO),
  85         ASN1_EMBED(X509_REQ, sig_alg, X509_ALGOR),
  86         ASN1_SIMPLE(X509_REQ, signature, ASN1_BIT_STRING)
  87 } ASN1_SEQUENCE_END_ref(X509_REQ, X509_REQ)
  88
  89 IMPLEMENT_ASN1_FUNCTIONS(X509_REQ)
  90
  91 IMPLEMENT_ASN1_DUP_FUNCTION(X509_REQ)
  92
  93 void X509_REQ_set0_distinguishing_id(X509_REQ *x, ASN1_OCTET_STRING *d_id)
  94 {
  95     ASN1_OCTET_STRING_free(x->distinguishing_id);
  96     x->distinguishing_id = d_id;
  97 }
  98
  99 ASN1_OCTET_STRING *X509_REQ_get0_distinguishing_id(X509_REQ *x)
 100 {
 101     return x->distinguishing_id;
 102 }