[openssl-users] openssl is flexible when verifying

[Yuting Chen]

Not sure about how to completely solve the problem.  As the
function
X509V3_get_d2i(STACK_OF(X509_EXTENSION) *x, int nid, int *crit, int *idx)
is called, crit is not actually used.
(e.g., in v3_purp.c, line 462)
x->akid =X509_get_ext_d2i(x, NID_authority_key_identifier, NULL, NULL);

If the value of crit can be retrieved, we may fix
function X509_check_issued (around line 701).

if(X509_NAME_cmp(X509_get_subject_name(issuer),
     X509_get_issuer_name(subject)))
         return X509_V_ERR_SUBJECT_ISSUER_MISMATCH;
     x509v3_cache_extensions(issuer);
     x509v3_cache_extensions(subject);

    if(subject->akid)
     {
         int ret = X509_check_akid(issuer, subject->akid);
         if (ret != X509_V_OK)
            return ret;
     }
+    else if (crit==-2) //subject has more than one akids
+         return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
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