crypto/x509/x_req.c

   1 /*
   2  * Copyright 1995-2021 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     X509_REQ *ret = (X509_REQ *)*pval;
  52
  53     switch (operation) {
  54     case ASN1_OP_D2I_PRE:
  55         ASN1_OCTET_STRING_free(ret->distinguishing_id);
  56         /* fall thru */
  57     case ASN1_OP_NEW_POST:
  58         ret->distinguishing_id = NULL;
  59         break;
  60
  61     case ASN1_OP_FREE_POST:
  62         ASN1_OCTET_STRING_free(ret->distinguishing_id);
  63         break;
  64     case ASN1_OP_DUP_POST:
  65         {
  66             X509_REQ *old = exarg;
  67
  68             if (!ossl_x509_req_set0_libctx(ret, old->libctx, old->propq))
  69                 return 0;
  70         }
  71         break;
  72     }
  73
  74     return 1;
  75 }
  76
  77 ASN1_SEQUENCE_enc(X509_REQ_INFO, enc, rinf_cb) = {
  78         ASN1_SIMPLE(X509_REQ_INFO, version, ASN1_INTEGER),
  79         ASN1_SIMPLE(X509_REQ_INFO, subject, X509_NAME),
  80         ASN1_SIMPLE(X509_REQ_INFO, pubkey, X509_PUBKEY),
  81         /* This isn't really OPTIONAL but it gets round invalid
  82          * encodings
  83          */
  84         ASN1_IMP_SET_OF_OPT(X509_REQ_INFO, attributes, X509_ATTRIBUTE, 0)
  85 } ASN1_SEQUENCE_END_enc(X509_REQ_INFO, X509_REQ_INFO)
  86
  87 IMPLEMENT_ASN1_FUNCTIONS(X509_REQ_INFO)
  88
  89 ASN1_SEQUENCE_ref(X509_REQ, req_cb) = {
  90         ASN1_EMBED(X509_REQ, req_info, X509_REQ_INFO),
  91         ASN1_EMBED(X509_REQ, sig_alg, X509_ALGOR),
  92         ASN1_SIMPLE(X509_REQ, signature, ASN1_BIT_STRING)
  93 } ASN1_SEQUENCE_END_ref(X509_REQ, X509_REQ)
  94
  95 IMPLEMENT_ASN1_FUNCTIONS(X509_REQ)
  96
  97 IMPLEMENT_ASN1_DUP_FUNCTION(X509_REQ)
  98
  99 void X509_REQ_set0_distinguishing_id(X509_REQ *x, ASN1_OCTET_STRING *d_id)
 100 {
 101     ASN1_OCTET_STRING_free(x->distinguishing_id);
 102     x->distinguishing_id = d_id;
 103 }
 104
 105 ASN1_OCTET_STRING *X509_REQ_get0_distinguishing_id(X509_REQ *x)
 106 {
 107     return x->distinguishing_id;
 108 }
 109
 110 /*
 111  * This should only be used if the X509_REQ object was embedded inside another
 112  * asn1 object and it needs a libctx to operate.
 113  * Use X509_REQ_new_ex() instead if possible.
 114  */
 115 int ossl_x509_req_set0_libctx(X509_REQ *x, OSSL_LIB_CTX *libctx,
 116                               const char *propq)
 117 {
 118     if (x != NULL) {
 119         x->libctx = libctx;
 120         OPENSSL_free(x->propq);
 121         x->propq = NULL;
 122         if (propq != NULL) {
 123             x->propq = OPENSSL_strdup(propq);
 124             if (x->propq == NULL)
 125                 return 0;
 126         }
 127     }
 128     return 1;
 129 }
 130
 131 X509_REQ *X509_REQ_new_ex(OSSL_LIB_CTX *libctx, const char *propq)
 132 {
 133     X509_REQ *req = NULL;
 134
 135     req = (X509_REQ *)ASN1_item_new((X509_REQ_it()));
 136     if (!ossl_x509_req_set0_libctx(req, libctx, propq)) {
 137         X509_REQ_free(req);
 138         req = NULL;
 139     }
 140     return req;
 141 }