e6b5883e02
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@17399 ec53bebd-3082-4978-b11e-865c3cabbd6b
1975 lines
44 KiB
C
1975 lines
44 KiB
C
/*
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* Copyright (c) 2004 - 2006 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "hx_locl.h"
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RCSID("$Id$");
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#include "crypto-headers.h"
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struct hx509_verify_ctx_data {
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hx509_certs trust_anchors;
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int flags;
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#define HX509_VERIFY_CTX_F_TIME_SET 1
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#define HX509_VERIFY_CTX_F_ALLOW_PROXY_CERTIFICATE 2
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time_t time_now;
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unsigned int max_depth;
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#define HX509_VERIFY_MAX_DEPTH 30
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hx509_revoke_ctx revoke_ctx;
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};
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struct _hx509_cert_attrs {
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size_t len;
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hx509_cert_attribute *val;
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};
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struct hx509_cert_data {
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unsigned int ref;
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char *friendlyname;
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Certificate *data;
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hx509_private_key private_key;
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struct _hx509_cert_attrs attrs;
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hx509_name basename;
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};
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typedef struct hx509_name_constraints {
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NameConstraints *val;
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size_t len;
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} hx509_name_constraints;
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#define GeneralSubtrees_SET(g,var) \
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(g)->len = (var)->len, (g)->val = (var)->val;
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/*
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*
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*/
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void
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_hx509_abort(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vprintf(fmt, ap);
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va_end(ap);
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printf("\n");
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fflush(stdout);
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abort();
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}
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/*
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*
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*/
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int
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hx509_context_init(hx509_context *context)
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{
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*context = calloc(1, sizeof(**context));
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if (*context == NULL)
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return ENOMEM;
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_hx509_ks_mem_register(*context);
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_hx509_ks_file_register(*context);
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_hx509_ks_pkcs12_register(*context);
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_hx509_ks_pkcs11_register(*context);
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_hx509_ks_dir_register(*context);
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ENGINE_add_conf_module();
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(*context)->ocsp_time_diff = HX509_DEFAULT_OCSP_TIME_DIFF;
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initialize_hx_error_table_r(&(*context)->et_list);
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return 0;
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}
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void
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hx509_context_set_missing_revoke(hx509_context context, int flag)
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{
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if (flag)
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context->flags |= HX509_CTX_VERIFY_MISSING_OK;
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else
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context->flags &= ~HX509_CTX_VERIFY_MISSING_OK;
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}
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void
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hx509_context_free(hx509_context *context)
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{
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if ((*context)->ks_ops) {
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free((*context)->ks_ops);
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(*context)->ks_ops = NULL;
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}
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(*context)->ks_num_ops = 0;
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free_error_table ((*context)->et_list);
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free(*context);
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*context = NULL;
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}
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/*
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*
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*/
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Certificate *
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_hx509_get_cert(hx509_cert cert)
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{
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return cert->data;
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}
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/*
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*
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*/
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#if 0
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void
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_hx509_print_cert_subject(hx509_cert cert)
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{
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char *subject_name;
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hx509_name name;
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int ret;
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ret = hx509_cert_get_subject(cert, &name);
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if (ret)
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abort();
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ret = hx509_name_to_string(name, &subject_name);
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hx509_name_free(&name);
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if (ret)
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abort();
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printf("name: %s\n", subject_name);
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free(subject_name);
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}
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#endif
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/*
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*
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*/
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int
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_hx509_cert_get_version(const Certificate *t)
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{
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return t->tbsCertificate.version ? *t->tbsCertificate.version + 1 : 1;
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}
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int
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hx509_cert_init(hx509_context context, const Certificate *c, hx509_cert *cert)
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{
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int ret;
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*cert = malloc(sizeof(**cert));
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if (*cert == NULL)
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return ENOMEM;
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(*cert)->ref = 1;
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(*cert)->friendlyname = NULL;
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(*cert)->attrs.len = 0;
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(*cert)->attrs.val = NULL;
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(*cert)->private_key = NULL;
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(*cert)->basename = NULL;
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(*cert)->data = malloc(sizeof(*(*cert)->data));
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if ((*cert)->data == NULL) {
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free(*cert);
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return ENOMEM;
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}
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memset((*cert)->data, 0, sizeof(*(*cert)->data));
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ret = copy_Certificate(c, (*cert)->data);
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if (ret) {
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free((*cert)->data);
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free(*cert);
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}
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return ret;
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}
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/* Doesn't make a copy of `private_key'. */
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int
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_hx509_cert_assign_key(hx509_cert cert, hx509_private_key private_key)
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{
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if (cert->private_key)
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_hx509_free_private_key(&cert->private_key);
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cert->private_key = private_key;
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return 0;
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}
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void
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hx509_cert_free(hx509_cert cert)
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{
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int i;
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if (cert == NULL)
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return;
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if (cert->ref <= 0)
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_hx509_abort("refcount <= 0");
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if (--cert->ref > 0)
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return;
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if (cert->private_key)
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_hx509_free_private_key(&cert->private_key);
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free_Certificate(cert->data);
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free(cert->data);
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for (i = 0; i < cert->attrs.len; i++) {
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free_octet_string(&cert->attrs.val[i]->data);
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free_oid(&cert->attrs.val[i]->oid);
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free(cert->attrs.val[i]);
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}
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free(cert->attrs.val);
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free(cert->friendlyname);
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if (cert->basename)
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hx509_name_free(&cert->basename);
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memset(cert, 0, sizeof(cert));
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free(cert);
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}
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hx509_cert
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hx509_cert_ref(hx509_cert cert)
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{
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if (cert->ref <= 0)
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_hx509_abort("refcount <= 0");
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cert->ref++;
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if (cert->ref == 0)
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_hx509_abort("refcount == 0");
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return cert;
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}
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int
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hx509_verify_init_ctx(hx509_context context, hx509_verify_ctx *ctx)
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{
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hx509_verify_ctx c;
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c = calloc(1, sizeof(*c));
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if (c == NULL)
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return ENOMEM;
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c->max_depth = HX509_VERIFY_MAX_DEPTH;
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*ctx = c;
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return 0;
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}
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void
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hx509_verify_destroy_ctx(hx509_verify_ctx ctx)
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{
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if (ctx)
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memset(ctx, 0, sizeof(*ctx));
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free(ctx);
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}
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void
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hx509_verify_attach_anchors(hx509_verify_ctx ctx, hx509_certs set)
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{
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ctx->trust_anchors = set;
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}
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void
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hx509_verify_attach_revoke(hx509_verify_ctx ctx, hx509_revoke_ctx revoke)
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{
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ctx->revoke_ctx = revoke;
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}
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void
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hx509_verify_set_time(hx509_verify_ctx ctx, time_t t)
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{
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ctx->flags |= HX509_VERIFY_CTX_F_TIME_SET;
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ctx->time_now = t;
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}
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void
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hx509_verify_set_proxy_certificate(hx509_verify_ctx ctx, int boolean)
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{
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if (boolean)
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ctx->flags |= HX509_VERIFY_CTX_F_ALLOW_PROXY_CERTIFICATE;
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else
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ctx->flags &= ~HX509_VERIFY_CTX_F_ALLOW_PROXY_CERTIFICATE;
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}
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static const Extension *
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find_extension(const Certificate *cert, const heim_oid *oid, int *idx)
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{
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const TBSCertificate *c = &cert->tbsCertificate;
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if (c->version == NULL || *c->version < 2 || c->extensions == NULL)
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return NULL;
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for (;*idx < c->extensions->len; (*idx)++) {
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if (heim_oid_cmp(&c->extensions->val[*idx].extnID, oid) == 0)
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return &c->extensions->val[(*idx)++];
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}
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return NULL;
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}
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static int
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find_extension_auth_key_id(const Certificate *subject,
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AuthorityKeyIdentifier *ai)
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{
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const Extension *e;
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size_t size;
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int i = 0;
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memset(ai, 0, sizeof(*ai));
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e = find_extension(subject, oid_id_x509_ce_authorityKeyIdentifier(), &i);
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if (e == NULL)
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return HX509_EXTENSION_NOT_FOUND;
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return decode_AuthorityKeyIdentifier(e->extnValue.data,
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e->extnValue.length,
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ai, &size);
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}
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static int
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find_extension_subject_key_id(const Certificate *issuer,
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SubjectKeyIdentifier *si)
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{
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const Extension *e;
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size_t size;
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int i = 0;
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memset(si, 0, sizeof(*si));
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e = find_extension(issuer, oid_id_x509_ce_subjectKeyIdentifier(), &i);
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if (e == NULL)
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return HX509_EXTENSION_NOT_FOUND;
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return decode_SubjectKeyIdentifier(e->extnValue.data,
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e->extnValue.length,
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si, &size);
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}
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static int
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find_extension_name_constraints(const Certificate *subject,
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NameConstraints *nc)
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{
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const Extension *e;
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size_t size;
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int i = 0;
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memset(nc, 0, sizeof(*nc));
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e = find_extension(subject, oid_id_x509_ce_nameConstraints(), &i);
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if (e == NULL)
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return HX509_EXTENSION_NOT_FOUND;
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return decode_NameConstraints(e->extnValue.data,
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e->extnValue.length,
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nc, &size);
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}
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static int
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find_extension_subject_alt_name(const Certificate *cert, int *i,
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GeneralNames *sa)
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{
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const Extension *e;
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size_t size;
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memset(sa, 0, sizeof(*sa));
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e = find_extension(cert, oid_id_x509_ce_subjectAltName(), i);
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if (e == NULL)
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return HX509_EXTENSION_NOT_FOUND;
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return decode_GeneralNames(e->extnValue.data,
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e->extnValue.length,
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sa, &size);
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}
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static int
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find_extension_eku(const Certificate *cert, ExtKeyUsage *eku)
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{
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const Extension *e;
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size_t size;
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int i = 0;
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memset(eku, 0, sizeof(*eku));
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e = find_extension(cert, oid_id_x509_ce_extKeyUsage(), &i);
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if (e == NULL)
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return HX509_EXTENSION_NOT_FOUND;
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return decode_ExtKeyUsage(e->extnValue.data,
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e->extnValue.length,
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eku, &size);
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}
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static int
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add_to_list(hx509_octet_string_list *list, const heim_octet_string *entry)
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{
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void *p;
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int ret;
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p = realloc(list->val, (list->len + 1) * sizeof(list->val[0]));
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if (p == NULL)
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return ENOMEM;
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list->val = p;
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ret = copy_octet_string(entry, &list->val[list->len]);
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if (ret)
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return ret;
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list->len++;
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return 0;
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}
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void
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hx509_free_octet_string_list(hx509_octet_string_list *list)
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{
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int i;
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for (i = 0; i < list->len; i++)
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free_octet_string(&list->val[i]);
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free(list->val);
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list->val = NULL;
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list->len = 0;
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}
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int
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hx509_cert_find_subjectAltName_otherName(hx509_cert cert,
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const heim_oid *oid,
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hx509_octet_string_list *list)
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{
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GeneralNames sa;
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int ret, i, j;
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list->val = NULL;
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list->len = 0;
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i = 0;
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while (1) {
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ret = find_extension_subject_alt_name(_hx509_get_cert(cert), &i, &sa);
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i++;
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if (ret == HX509_EXTENSION_NOT_FOUND) {
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ret = 0;
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break;
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} else if (ret != 0)
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break;
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for (j = 0; j < sa.len; j++) {
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if (sa.val[j].element == choice_GeneralName_otherName &&
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heim_oid_cmp(&sa.val[j].u.otherName.type_id, oid) == 0)
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{
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ret = add_to_list(list, &sa.val[j].u.otherName.value);
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if (ret) {
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free_GeneralNames(&sa);
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return ret;
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}
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}
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}
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free_GeneralNames(&sa);
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}
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return ret;
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}
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static int
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check_key_usage(hx509_context context, const Certificate *cert,
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unsigned flags, int req_present)
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{
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const Extension *e;
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KeyUsage ku;
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size_t size;
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int ret, i = 0;
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unsigned ku_flags;
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if (_hx509_cert_get_version(cert) < 3)
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return 0;
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e = find_extension(cert, oid_id_x509_ce_keyUsage(), &i);
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if (e == NULL) {
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if (req_present) {
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hx509_set_error_string(context, 0, HX509_KU_CERT_MISSING,
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"Required extension key "
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"usage missing from certifiate");
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return HX509_KU_CERT_MISSING;
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}
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return 0;
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}
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ret = decode_KeyUsage(e->extnValue.data, e->extnValue.length, &ku, &size);
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if (ret)
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return ret;
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ku_flags = KeyUsage2int(ku);
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if ((ku_flags & flags) != flags) {
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hx509_set_error_string(context, 0, HX509_KU_CERT_MISSING,
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"Key usage missing from certifiate");
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return HX509_KU_CERT_MISSING;
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}
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return 0;
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}
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int
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_hx509_check_key_usage(hx509_context context, hx509_cert cert,
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unsigned flags, int req_present)
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{
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return check_key_usage(context, _hx509_get_cert(cert), flags, req_present);
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}
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enum certtype { PROXY_CERT, EE_CERT, CA_CERT };
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static int
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check_basic_constraints(hx509_context context, const Certificate *cert,
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enum certtype type, int depth)
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{
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BasicConstraints bc;
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const Extension *e;
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size_t size;
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int ret, i = 0;
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if (_hx509_cert_get_version(cert) < 3)
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return 0;
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e = find_extension(cert, oid_id_x509_ce_basicConstraints(), &i);
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if (e == NULL) {
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switch(type) {
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case PROXY_CERT:
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case EE_CERT:
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return 0;
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case CA_CERT: {
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char *name;
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ret = _hx509_unparse_Name(&cert->tbsCertificate.subject, &name);
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||
assert(ret == 0);
|
||
hx509_set_error_string(context, 0, HX509_EXTENSION_NOT_FOUND,
|
||
"basicConstraints missing from "
|
||
"CA certifiacte %s", name);
|
||
free(name);
|
||
return HX509_EXTENSION_NOT_FOUND;
|
||
}
|
||
}
|
||
}
|
||
|
||
ret = decode_BasicConstraints(e->extnValue.data,
|
||
e->extnValue.length, &bc,
|
||
&size);
|
||
if (ret)
|
||
return ret;
|
||
switch(type) {
|
||
case PROXY_CERT:
|
||
if (bc.cA != NULL && *bc.cA)
|
||
ret = HX509_PARENT_IS_CA;
|
||
break;
|
||
case EE_CERT:
|
||
ret = 0;
|
||
break;
|
||
case CA_CERT:
|
||
if (bc.cA == NULL || !*bc.cA)
|
||
ret = HX509_PARENT_NOT_CA;
|
||
else if (bc.pathLenConstraint)
|
||
if (depth - 1 > *bc.pathLenConstraint)
|
||
ret = HX509_CA_PATH_TOO_DEEP;
|
||
break;
|
||
}
|
||
free_BasicConstraints(&bc);
|
||
return ret;
|
||
}
|
||
|
||
int
|
||
_hx509_cert_is_parent_cmp(const Certificate *subject,
|
||
const Certificate *issuer,
|
||
int allow_self_signed)
|
||
{
|
||
int diff;
|
||
AuthorityKeyIdentifier ai;
|
||
SubjectKeyIdentifier si;
|
||
int ret_ai, ret_si;
|
||
|
||
diff = _hx509_name_cmp(&issuer->tbsCertificate.subject,
|
||
&subject->tbsCertificate.issuer);
|
||
if (diff)
|
||
return diff;
|
||
|
||
memset(&ai, 0, sizeof(ai));
|
||
memset(&si, 0, sizeof(si));
|
||
|
||
/*
|
||
* Try to find AuthorityKeyIdentifier, if its not present in the
|
||
* subject certificate nor the parent.
|
||
*/
|
||
|
||
ret_ai = find_extension_auth_key_id(subject, &ai);
|
||
if (ret_ai && ret_ai != HX509_EXTENSION_NOT_FOUND)
|
||
return 1;
|
||
ret_si = find_extension_subject_key_id(issuer, &si);
|
||
if (ret_si && ret_si != HX509_EXTENSION_NOT_FOUND)
|
||
return -1;
|
||
|
||
if (ret_si && ret_ai)
|
||
goto out;
|
||
if (ret_ai)
|
||
goto out;
|
||
if (ret_si) {
|
||
if (allow_self_signed)
|
||
diff = 0;
|
||
else
|
||
diff = -1;
|
||
goto out;
|
||
}
|
||
|
||
if (ai.keyIdentifier == NULL) /* XXX */
|
||
diff = -1;
|
||
else
|
||
diff = heim_octet_string_cmp(ai.keyIdentifier, &si);
|
||
if (diff)
|
||
goto out;
|
||
|
||
out:
|
||
free_AuthorityKeyIdentifier(&ai);
|
||
free_SubjectKeyIdentifier(&si);
|
||
return diff;
|
||
}
|
||
|
||
static int
|
||
certificate_is_anchor(hx509_context context,
|
||
hx509_certs trust_anchors,
|
||
const hx509_cert cert)
|
||
{
|
||
hx509_query q;
|
||
hx509_cert c;
|
||
int ret;
|
||
|
||
_hx509_query_clear(&q);
|
||
|
||
q.match = HX509_QUERY_MATCH_CERTIFICATE;
|
||
q.certificate = _hx509_get_cert(cert);
|
||
|
||
ret = hx509_certs_find(context, trust_anchors, &q, &c);
|
||
if (ret == 0)
|
||
hx509_cert_free(c);
|
||
return ret == 0;
|
||
}
|
||
|
||
static int
|
||
certificate_is_self_signed(const Certificate *cert)
|
||
{
|
||
return _hx509_cert_is_parent_cmp(cert, cert, 1) == 0;
|
||
}
|
||
|
||
/*
|
||
* The subjectName is "null" when its empty set of relative DBs.
|
||
*/
|
||
|
||
static int
|
||
subject_null_p(const Certificate *c)
|
||
{
|
||
return c->tbsCertificate.subject.u.rdnSequence.len == 0;
|
||
}
|
||
|
||
|
||
static int
|
||
find_parent(hx509_context context,
|
||
hx509_certs trust_anchors,
|
||
hx509_path *path,
|
||
hx509_certs pool,
|
||
hx509_cert current,
|
||
hx509_cert *parent)
|
||
{
|
||
AuthorityKeyIdentifier ai;
|
||
hx509_query q;
|
||
int ret;
|
||
|
||
*parent = NULL;
|
||
memset(&ai, 0, sizeof(ai));
|
||
|
||
_hx509_query_clear(&q);
|
||
|
||
if (!subject_null_p(current->data)) {
|
||
q.match |= HX509_QUERY_FIND_ISSUER_CERT;
|
||
q.subject = _hx509_get_cert(current);
|
||
} else {
|
||
ret = find_extension_auth_key_id(current->data, &ai);
|
||
if (ret) {
|
||
hx509_set_error_string(context, 0, HX509_CERTIFICATE_MALFORMED,
|
||
"Subjectless certificate missing AuthKeyID");
|
||
return HX509_CERTIFICATE_MALFORMED;
|
||
}
|
||
|
||
if (ai.keyIdentifier == NULL) {
|
||
free_AuthorityKeyIdentifier(&ai);
|
||
hx509_set_error_string(context, 0, HX509_CERTIFICATE_MALFORMED,
|
||
"Subjectless certificate missing keyIdentifier "
|
||
"inside AuthKeyID");
|
||
return HX509_CERTIFICATE_MALFORMED;
|
||
}
|
||
|
||
q.subject_id = ai.keyIdentifier;
|
||
q.match = HX509_QUERY_MATCH_SUBJECT_KEY_ID;
|
||
}
|
||
|
||
q.path = path;
|
||
q.match |= HX509_QUERY_NO_MATCH_PATH;
|
||
|
||
if (pool) {
|
||
ret = hx509_certs_find(context, pool, &q, parent);
|
||
if (ret == 0) {
|
||
free_AuthorityKeyIdentifier(&ai);
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Assume trust anchors isn't proxy certificates, require
|
||
* KeyUsage.KeyCertSign
|
||
*/
|
||
q.match |= HX509_QUERY_KU_KEYCERTSIGN;
|
||
ret = hx509_certs_find(context, trust_anchors, &q, parent);
|
||
if (ret == 0) {
|
||
free_AuthorityKeyIdentifier(&ai);
|
||
return ret;
|
||
}
|
||
|
||
free_AuthorityKeyIdentifier(&ai);
|
||
|
||
{
|
||
hx509_name name;
|
||
char *str;
|
||
int ret;
|
||
|
||
ret = hx509_cert_get_subject(current, &name);
|
||
if (ret) {
|
||
hx509_clear_error_string(context);
|
||
return HX509_ISSUER_NOT_FOUND;
|
||
}
|
||
ret = hx509_name_to_string(name, &str);
|
||
hx509_name_free(&name);
|
||
if (ret) {
|
||
hx509_clear_error_string(context);
|
||
return HX509_ISSUER_NOT_FOUND;
|
||
}
|
||
|
||
hx509_set_error_string(context, 0, HX509_ISSUER_NOT_FOUND,
|
||
"Failed to find issuer for"
|
||
"certificate with subject: %s", str);
|
||
free(str);
|
||
}
|
||
return HX509_ISSUER_NOT_FOUND;
|
||
}
|
||
|
||
/*
|
||
*
|
||
*/
|
||
|
||
static int
|
||
is_proxy_cert(hx509_context context, const Certificate *cert, ProxyCertInfo *rinfo)
|
||
{
|
||
ProxyCertInfo info;
|
||
const Extension *e;
|
||
size_t size;
|
||
int ret, i = 0;
|
||
|
||
if (rinfo)
|
||
memset(rinfo, 0, sizeof(*rinfo));
|
||
|
||
e = find_extension(cert, oid_id_pe_proxyCertInfo(), &i);
|
||
if (e == NULL) {
|
||
hx509_clear_error_string(context);
|
||
return HX509_EXTENSION_NOT_FOUND;
|
||
}
|
||
|
||
ret = decode_ProxyCertInfo(e->extnValue.data,
|
||
e->extnValue.length,
|
||
&info,
|
||
&size);
|
||
if (ret) {
|
||
hx509_clear_error_string(context);
|
||
return ret;
|
||
}
|
||
if (size != e->extnValue.length) {
|
||
free_ProxyCertInfo(&info);
|
||
hx509_clear_error_string(context);
|
||
return HX509_EXTRA_DATA_AFTER_STRUCTURE;
|
||
}
|
||
if (rinfo)
|
||
*rinfo = info;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Path operations are like MEMORY based keyset, but with exposed
|
||
* internal so we can do easy searches.
|
||
*/
|
||
|
||
int
|
||
_hx509_path_append(hx509_context context, hx509_path *path, hx509_cert cert)
|
||
{
|
||
hx509_cert *val;
|
||
val = realloc(path->val, (path->len + 1) * sizeof(path->val[0]));
|
||
if (val == NULL) {
|
||
hx509_set_error_string(context, 0, ENOMEM, "out of memory");
|
||
return ENOMEM;
|
||
}
|
||
|
||
path->val = val;
|
||
path->val[path->len] = hx509_cert_ref(cert);
|
||
path->len++;
|
||
|
||
return 0;
|
||
}
|
||
|
||
void
|
||
_hx509_path_free(hx509_path *path)
|
||
{
|
||
unsigned i;
|
||
|
||
for (i = 0; i < path->len; i++)
|
||
hx509_cert_free(path->val[i]);
|
||
free(path->val);
|
||
path->val = NULL;
|
||
path->len = 0;
|
||
}
|
||
|
||
/*
|
||
* Find path by looking up issuer for the top certificate and continue
|
||
* until an anchor certificate is found. A certificate never included
|
||
* twice in the path.
|
||
*
|
||
* The path includes a path from the top certificate to the anchor
|
||
* certificate.
|
||
*
|
||
* The caller needs to free `path´ both on successful built path and
|
||
* failure.
|
||
*/
|
||
|
||
int
|
||
_hx509_calculate_path(hx509_context context,
|
||
hx509_certs trust_anchors,
|
||
unsigned int max_depth,
|
||
hx509_cert cert,
|
||
hx509_certs pool,
|
||
hx509_path *path)
|
||
{
|
||
hx509_cert parent, current;
|
||
int ret;
|
||
|
||
if (max_depth == 0)
|
||
max_depth = HX509_VERIFY_MAX_DEPTH;
|
||
|
||
ret = _hx509_path_append(context, path, cert);
|
||
if (ret)
|
||
return ret;
|
||
|
||
current = hx509_cert_ref(cert);
|
||
|
||
while (!certificate_is_anchor(context, trust_anchors, current)) {
|
||
|
||
ret = find_parent(context, trust_anchors, path, pool, current, &parent);
|
||
hx509_cert_free(current);
|
||
if (ret)
|
||
return ret;
|
||
|
||
ret = _hx509_path_append(context, path, parent);
|
||
if (ret)
|
||
return ret;
|
||
current = parent;
|
||
|
||
if (path->len > max_depth) {
|
||
hx509_set_error_string(context, 0, HX509_PATH_TOO_LONG,
|
||
"Path too long while bulding certificate chain");
|
||
return HX509_PATH_TOO_LONG;
|
||
}
|
||
}
|
||
hx509_cert_free(current);
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
AlgorithmIdentifier_cmp(const AlgorithmIdentifier *p,
|
||
const AlgorithmIdentifier *q)
|
||
{
|
||
int diff;
|
||
diff = heim_oid_cmp(&p->algorithm, &q->algorithm);
|
||
if (diff)
|
||
return diff;
|
||
if (p->parameters) {
|
||
if (q->parameters)
|
||
return heim_any_cmp(p->parameters,
|
||
q->parameters);
|
||
else
|
||
return 1;
|
||
} else {
|
||
if (q->parameters)
|
||
return -1;
|
||
else
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
int
|
||
_hx509_Certificate_cmp(const Certificate *p, const Certificate *q)
|
||
{
|
||
int diff;
|
||
diff = heim_bit_string_cmp(&p->signatureValue, &q->signatureValue);
|
||
if (diff)
|
||
return diff;
|
||
diff = AlgorithmIdentifier_cmp(&p->signatureAlgorithm,
|
||
&q->signatureAlgorithm);
|
||
if (diff)
|
||
return diff;
|
||
diff = heim_octet_string_cmp(&p->tbsCertificate._save,
|
||
&q->tbsCertificate._save);
|
||
return diff;
|
||
}
|
||
|
||
int
|
||
hx509_cert_cmp(hx509_cert p, hx509_cert q)
|
||
{
|
||
return _hx509_Certificate_cmp(p->data, q->data);
|
||
}
|
||
|
||
int
|
||
hx509_cert_get_issuer(hx509_cert p, hx509_name *name)
|
||
{
|
||
return _hx509_name_from_Name(&p->data->tbsCertificate.issuer, name);
|
||
}
|
||
|
||
int
|
||
hx509_cert_get_subject(hx509_cert p, hx509_name *name)
|
||
{
|
||
return _hx509_name_from_Name(&p->data->tbsCertificate.subject, name);
|
||
}
|
||
|
||
int
|
||
hx509_cert_get_base_subject(hx509_context context, hx509_cert c, hx509_name *name)
|
||
{
|
||
if (c->basename)
|
||
return hx509_name_copy(context, c->basename, name);
|
||
if (is_proxy_cert(context, c->data, NULL) == 0)
|
||
return EINVAL; /* XXX */
|
||
return _hx509_name_from_Name(&c->data->tbsCertificate.subject, name);
|
||
}
|
||
|
||
int
|
||
hx509_cert_get_serialnumber(hx509_cert p, heim_integer *i)
|
||
{
|
||
return copy_heim_integer(&p->data->tbsCertificate.serialNumber, i);
|
||
}
|
||
|
||
hx509_private_key
|
||
_hx509_cert_private_key(hx509_cert p)
|
||
{
|
||
return p->private_key;
|
||
}
|
||
|
||
int
|
||
_hx509_cert_private_decrypt(const heim_octet_string *ciphertext,
|
||
const heim_oid *encryption_oid,
|
||
hx509_cert p,
|
||
heim_octet_string *cleartext)
|
||
{
|
||
cleartext->data = NULL;
|
||
cleartext->length = 0;
|
||
|
||
if (p->private_key == NULL)
|
||
return EINVAL; /* XXX */
|
||
|
||
return _hx509_private_key_private_decrypt(ciphertext,
|
||
encryption_oid,
|
||
p->private_key,
|
||
cleartext);
|
||
}
|
||
|
||
int
|
||
_hx509_cert_public_encrypt(const heim_octet_string *cleartext,
|
||
const hx509_cert p,
|
||
heim_oid *encryption_oid,
|
||
heim_octet_string *ciphertext)
|
||
{
|
||
return _hx509_public_encrypt(cleartext, p->data,
|
||
encryption_oid, ciphertext);
|
||
}
|
||
|
||
/*
|
||
*
|
||
*/
|
||
|
||
time_t
|
||
_hx509_Time2time_t(const Time *t)
|
||
{
|
||
switch(t->element) {
|
||
case choice_Time_utcTime:
|
||
return t->u.utcTime;
|
||
case choice_Time_generalTime:
|
||
return t->u.generalTime;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
*
|
||
*/
|
||
|
||
static int
|
||
init_name_constraints(hx509_name_constraints *nc)
|
||
{
|
||
memset(nc, 0, sizeof(*nc));
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
add_name_constraints(hx509_context context, const Certificate *c, int not_ca,
|
||
hx509_name_constraints *nc)
|
||
{
|
||
NameConstraints tnc;
|
||
int ret;
|
||
|
||
ret = find_extension_name_constraints(c, &tnc);
|
||
if (ret == HX509_EXTENSION_NOT_FOUND)
|
||
return 0;
|
||
else if (ret) {
|
||
hx509_set_error_string(context, 0, ret, "Failed getting NameConstraints");
|
||
return ret;
|
||
} else if (not_ca) {
|
||
ret = HX509_VERIFY_CONSTRAINTS;
|
||
hx509_set_error_string(context, 0, ret, "Not a CA and "
|
||
"have NameConstraints");
|
||
} else {
|
||
NameConstraints *val;
|
||
val = realloc(nc->val, sizeof(nc->val[0]) * (nc->len + 1));
|
||
if (val == NULL) {
|
||
hx509_clear_error_string(context);
|
||
ret = ENOMEM;
|
||
goto out;
|
||
}
|
||
nc->val = val;
|
||
ret = copy_NameConstraints(&tnc, &nc->val[nc->len]);
|
||
if (ret) {
|
||
hx509_clear_error_string(context);
|
||
goto out;
|
||
}
|
||
nc->len += 1;
|
||
}
|
||
out:
|
||
free_NameConstraints(&tnc);
|
||
return ret;
|
||
}
|
||
|
||
static int
|
||
match_RDN(const RelativeDistinguishedName *c,
|
||
const RelativeDistinguishedName *n)
|
||
{
|
||
int i;
|
||
|
||
if (c->len != n->len)
|
||
return HX509_NAME_CONSTRAINT_ERROR;
|
||
|
||
for (i = 0; i < n->len; i++) {
|
||
if (heim_oid_cmp(&c->val[i].type, &n->val[i].type) != 0)
|
||
return HX509_NAME_CONSTRAINT_ERROR;
|
||
if (_hx509_name_ds_cmp(&c->val[i].value, &n->val[i].value) != 0)
|
||
return HX509_NAME_CONSTRAINT_ERROR;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
match_X501Name(const Name *c, const Name *n)
|
||
{
|
||
int i, ret;
|
||
|
||
if (c->element != choice_Name_rdnSequence
|
||
|| n->element != choice_Name_rdnSequence)
|
||
return 0;
|
||
if (c->u.rdnSequence.len > n->u.rdnSequence.len)
|
||
return HX509_NAME_CONSTRAINT_ERROR;
|
||
for (i = 0; i < c->u.rdnSequence.len; i++) {
|
||
ret = match_RDN(&c->u.rdnSequence.val[i], &n->u.rdnSequence.val[i]);
|
||
if (ret)
|
||
return ret;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
|
||
static int
|
||
match_general_name(const GeneralName *c, const GeneralName *n, int *match)
|
||
{
|
||
/*
|
||
* Name constraints only apply to the same name type, see RFC3280,
|
||
* 4.2.1.11.
|
||
*/
|
||
assert(c->element == n->element);
|
||
|
||
switch(c->element) {
|
||
case choice_GeneralName_otherName:
|
||
if (heim_oid_cmp(&c->u.otherName.type_id,
|
||
&n->u.otherName.type_id) != 0)
|
||
return HX509_NAME_CONSTRAINT_ERROR;
|
||
if (heim_any_cmp(&c->u.otherName.value,
|
||
&n->u.otherName.value) != 0)
|
||
return HX509_NAME_CONSTRAINT_ERROR;
|
||
*match = 1;
|
||
return 0;
|
||
case choice_GeneralName_rfc822Name: {
|
||
const char *s;
|
||
size_t len1, len2;
|
||
s = strchr(c->u.rfc822Name, '@');
|
||
if (s) {
|
||
if (strcasecmp(c->u.rfc822Name, n->u.rfc822Name) != 0)
|
||
return HX509_NAME_CONSTRAINT_ERROR;
|
||
} else {
|
||
s = strchr(n->u.rfc822Name, '@');
|
||
if (s == NULL)
|
||
return HX509_NAME_CONSTRAINT_ERROR;
|
||
len1 = strlen(c->u.rfc822Name);
|
||
len2 = strlen(s + 1);
|
||
if (len1 > len2)
|
||
return HX509_NAME_CONSTRAINT_ERROR;
|
||
if (strcasecmp(s + 1 + len2 - len1, c->u.rfc822Name) != 0)
|
||
return HX509_NAME_CONSTRAINT_ERROR;
|
||
if (len1 < len2 && s[len2 - len1] != '.')
|
||
return HX509_NAME_CONSTRAINT_ERROR;
|
||
}
|
||
*match = 1;
|
||
return 0;
|
||
}
|
||
case choice_GeneralName_dNSName: {
|
||
size_t len1, len2;
|
||
|
||
len1 = strlen(c->u.dNSName);
|
||
len2 = strlen(n->u.dNSName);
|
||
if (len1 > len2)
|
||
return HX509_NAME_CONSTRAINT_ERROR;
|
||
if (strcasecmp(&n->u.dNSName[len2 - len1], c->u.dNSName) != 0)
|
||
return HX509_NAME_CONSTRAINT_ERROR;
|
||
*match = 1;
|
||
return 0;
|
||
}
|
||
case choice_GeneralName_directoryName: {
|
||
Name c_name, n_name;
|
||
int ret;
|
||
|
||
c_name._save.data = NULL;
|
||
c_name._save.length = 0;
|
||
c_name.element = c->u.directoryName.element;
|
||
c_name.u.rdnSequence = c->u.directoryName.u.rdnSequence;
|
||
|
||
n_name._save.data = NULL;
|
||
n_name._save.length = 0;
|
||
n_name.element = n->u.directoryName.element;
|
||
n_name.u.rdnSequence = n->u.directoryName.u.rdnSequence;
|
||
|
||
ret = match_X501Name(&c_name, &n_name);
|
||
if (ret == 0)
|
||
*match = 1;
|
||
return ret;
|
||
}
|
||
case choice_GeneralName_uniformResourceIdentifier:
|
||
case choice_GeneralName_iPAddress:
|
||
case choice_GeneralName_registeredID:
|
||
default:
|
||
return HX509_NAME_CONSTRAINT_ERROR;
|
||
}
|
||
}
|
||
|
||
static int
|
||
match_alt_name(const GeneralName *n, const Certificate *c,
|
||
int *same, int *match)
|
||
{
|
||
GeneralNames sa;
|
||
int ret, i, j;
|
||
|
||
i = 0;
|
||
do {
|
||
ret = find_extension_subject_alt_name(c, &i, &sa);
|
||
if (ret == HX509_EXTENSION_NOT_FOUND) {
|
||
ret = 0;
|
||
break;
|
||
} else if (ret != 0)
|
||
break;
|
||
|
||
for (j = 0; j < sa.len; j++) {
|
||
if (n->element == sa.val[j].element) {
|
||
*same = 1;
|
||
ret = match_general_name(n, &sa.val[j], match);
|
||
}
|
||
}
|
||
free_GeneralNames(&sa);
|
||
} while (1);
|
||
|
||
return ret;
|
||
}
|
||
|
||
|
||
static int
|
||
match_tree(const GeneralSubtrees *t, const Certificate *c, int *match)
|
||
{
|
||
int name, alt_name, same;
|
||
unsigned int i;
|
||
int ret = 0;
|
||
|
||
name = alt_name = same = *match = 0;
|
||
for (i = 0; i < t->len; i++) {
|
||
if (t->val[i].minimum && t->val[i].maximum)
|
||
return HX509_RANGE;
|
||
|
||
/*
|
||
* If the constraint apply to directoryNames, test is with
|
||
* subjectName of the certificate if the certificate have a
|
||
* non-null (empty) subjectName.
|
||
*/
|
||
|
||
if (t->val[i].base.element == choice_GeneralName_directoryName
|
||
&& !subject_null_p(c))
|
||
{
|
||
GeneralName certname;
|
||
|
||
|
||
certname.element = choice_GeneralName_directoryName;
|
||
certname.u.directoryName.element =
|
||
c->tbsCertificate.subject.element;
|
||
certname.u.directoryName.u.rdnSequence =
|
||
c->tbsCertificate.subject.u.rdnSequence;
|
||
|
||
ret = match_general_name(&t->val[i].base, &certname, &name);
|
||
}
|
||
|
||
/* Handle subjectAltNames, this is icky since they
|
||
* restrictions only apply if the subjectAltName is of the
|
||
* same type. So if there have been a match of type, require
|
||
* altname to be set.
|
||
*/
|
||
ret = match_alt_name(&t->val[i].base, c, &same, &alt_name);
|
||
}
|
||
if (name && (!same || alt_name))
|
||
*match = 1;
|
||
return ret;
|
||
}
|
||
|
||
static int
|
||
check_name_constraints(hx509_context context,
|
||
const hx509_name_constraints *nc,
|
||
const Certificate *c)
|
||
{
|
||
int match, ret;
|
||
int i;
|
||
|
||
for (i = 0 ; i < nc->len; i++) {
|
||
GeneralSubtrees gs;
|
||
|
||
if (nc->val[i].permittedSubtrees) {
|
||
GeneralSubtrees_SET(&gs, nc->val[i].permittedSubtrees);
|
||
ret = match_tree(&gs, c, &match);
|
||
if (ret) {
|
||
hx509_clear_error_string(context);
|
||
return ret;
|
||
}
|
||
/* allow null subjectNames, they wont matches anything */
|
||
if (match == 0 && !subject_null_p(c)) {
|
||
hx509_clear_error_string(context);
|
||
return HX509_VERIFY_CONSTRAINTS;
|
||
}
|
||
}
|
||
if (nc->val[i].excludedSubtrees) {
|
||
GeneralSubtrees_SET(&gs, nc->val[i].excludedSubtrees);
|
||
ret = match_tree(&gs, c, &match);
|
||
if (ret) {
|
||
hx509_clear_error_string(context);
|
||
return ret;
|
||
}
|
||
if (match) {
|
||
hx509_clear_error_string(context);
|
||
return HX509_VERIFY_CONSTRAINTS;
|
||
}
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
free_name_constraints(hx509_name_constraints *nc)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0 ; i < nc->len; i++)
|
||
free_NameConstraints(&nc->val[i]);
|
||
free(nc->val);
|
||
}
|
||
|
||
int
|
||
hx509_verify_path(hx509_context context,
|
||
hx509_verify_ctx ctx,
|
||
hx509_cert cert,
|
||
hx509_certs pool)
|
||
{
|
||
hx509_name_constraints nc;
|
||
hx509_path path;
|
||
#if 0
|
||
const AlgorithmIdentifier *alg_id;
|
||
#endif
|
||
int ret, i, proxy_cert_depth;
|
||
enum certtype type;
|
||
Name proxy_issuer;
|
||
|
||
memset(&proxy_issuer, 0, sizeof(proxy_issuer));
|
||
|
||
ret = init_name_constraints(&nc);
|
||
if (ret)
|
||
return ret;
|
||
|
||
path.val = NULL;
|
||
path.len = 0;
|
||
|
||
if ((ctx->flags & HX509_VERIFY_CTX_F_TIME_SET) == 0)
|
||
ctx->time_now = time(NULL);
|
||
|
||
/*
|
||
* Calculate the path from the certificate user presented to the
|
||
* to an anchor.
|
||
*/
|
||
ret = _hx509_calculate_path(context, ctx->trust_anchors, ctx->max_depth,
|
||
cert, pool, &path);
|
||
if (ret)
|
||
goto out;
|
||
|
||
#if 0
|
||
alg_id = path.val[path->len - 1]->data->tbsCertificate.signature;
|
||
#endif
|
||
|
||
/*
|
||
* Check CA and proxy certificate chain from the top of the
|
||
* certificate chain. Also check certificate is valid with respect
|
||
* to the current time.
|
||
*
|
||
*/
|
||
|
||
proxy_cert_depth = 0;
|
||
|
||
if (ctx->flags & HX509_VERIFY_CTX_F_ALLOW_PROXY_CERTIFICATE)
|
||
type = PROXY_CERT;
|
||
else
|
||
type = EE_CERT;
|
||
|
||
for (i = 0; i < path.len; i++) {
|
||
Certificate *c;
|
||
time_t t;
|
||
|
||
c = _hx509_get_cert(path.val[i]);
|
||
|
||
/*
|
||
* Lets do some basic check on issuer like
|
||
* keyUsage.keyCertSign and basicConstraints.cA bit depending
|
||
* on what type of certificate this is.
|
||
*/
|
||
|
||
switch (type) {
|
||
case CA_CERT:
|
||
ret = check_key_usage(context, c, 1 << 5, TRUE); /* XXX make constants */
|
||
if (ret)
|
||
goto out;
|
||
break;
|
||
case PROXY_CERT: {
|
||
ProxyCertInfo info;
|
||
|
||
if (is_proxy_cert(context, c, &info) == 0) {
|
||
Name name;
|
||
int j;
|
||
|
||
if (info.pCPathLenConstraint != NULL &&
|
||
*info.pCPathLenConstraint < i + 1)
|
||
{
|
||
free_ProxyCertInfo(&info);
|
||
hx509_clear_error_string(context);
|
||
ret = HX509_PATH_TOO_LONG;
|
||
goto out;
|
||
}
|
||
|
||
j = 0;
|
||
if (find_extension(c, oid_id_x509_ce_subjectAltName(), &j)) {
|
||
free_ProxyCertInfo(&info);
|
||
hx509_clear_error_string(context);
|
||
ret = HX509_PROXY_CERT_INVALID;
|
||
goto out;
|
||
}
|
||
|
||
j = 0;
|
||
if (find_extension(c, oid_id_x509_ce_issuerAltName(), &j)) {
|
||
free_ProxyCertInfo(&info);
|
||
hx509_clear_error_string(context);
|
||
ret = HX509_PROXY_CERT_INVALID;
|
||
goto out;
|
||
}
|
||
|
||
/*
|
||
* The subject name of the proxy certificate should be
|
||
* CN=XXX,<proxy issuer>, prune of CN and check if its
|
||
* the same over the whole chain of proxy certs and
|
||
* then check with the EE cert when we get to it.
|
||
*/
|
||
|
||
ret = copy_Name(&c->tbsCertificate.subject, &name);
|
||
if (ret) {
|
||
hx509_clear_error_string(context);
|
||
free_ProxyCertInfo(&info);
|
||
goto out;
|
||
}
|
||
|
||
j = name.u.rdnSequence.len;
|
||
if (name.u.rdnSequence.len < 2
|
||
|| name.u.rdnSequence.val[j - 1].len > 1
|
||
|| heim_oid_cmp(&name.u.rdnSequence.val[j - 1].val[0].type,
|
||
oid_id_at_commonName()))
|
||
{
|
||
free_ProxyCertInfo(&info);
|
||
hx509_clear_error_string(context);
|
||
ret = HX509_PROXY_CERT_NAME_WRONG;
|
||
goto out;
|
||
}
|
||
|
||
free_RelativeDistinguishedName(&name.u.rdnSequence.val[j - 1]);
|
||
name.u.rdnSequence.len -= 1;
|
||
|
||
if (proxy_cert_depth) {
|
||
ret = _hx509_name_cmp(&proxy_issuer, &name);
|
||
free_Name(&name);
|
||
if (ret) {
|
||
free_ProxyCertInfo(&info);
|
||
hx509_clear_error_string(context);
|
||
ret = HX509_PROXY_CERT_NAME_WRONG;
|
||
goto out;
|
||
}
|
||
} else {
|
||
proxy_issuer = name;
|
||
}
|
||
|
||
free_ProxyCertInfo(&info);
|
||
break;
|
||
} else {
|
||
/*
|
||
* Now we are done with the proxy certificates, if
|
||
* there where any proxy certificates
|
||
* (proxy_cert_depth > 0), check that the proxy issuer
|
||
* matched proxy certificates subject.
|
||
*/
|
||
if (proxy_cert_depth) {
|
||
ret = _hx509_name_cmp(&proxy_issuer,
|
||
&c->tbsCertificate.subject);
|
||
if (ret) {
|
||
ret = HX509_PROXY_CERT_NAME_WRONG;
|
||
hx509_clear_error_string(context);
|
||
goto out;
|
||
}
|
||
if (cert->basename)
|
||
hx509_name_free(&cert->basename);
|
||
|
||
ret = _hx509_name_from_Name(&proxy_issuer, &cert->basename);
|
||
if (ret) {
|
||
hx509_clear_error_string(context);
|
||
goto out;
|
||
}
|
||
}
|
||
}
|
||
type = EE_CERT;
|
||
/* FALLTHOUGH */
|
||
}
|
||
case EE_CERT:
|
||
break;
|
||
}
|
||
|
||
ret = check_basic_constraints(context, c, type, i - proxy_cert_depth);
|
||
if (ret)
|
||
goto out;
|
||
|
||
t = _hx509_Time2time_t(&c->tbsCertificate.validity.notBefore);
|
||
if (t > ctx->time_now) {
|
||
ret = HX509_CERT_USED_BEFORE_TIME;
|
||
hx509_clear_error_string(context);
|
||
goto out;
|
||
}
|
||
t = _hx509_Time2time_t(&c->tbsCertificate.validity.notAfter);
|
||
if (t < ctx->time_now) {
|
||
ret = HX509_CERT_USED_AFTER_TIME;
|
||
hx509_clear_error_string(context);
|
||
goto out;
|
||
}
|
||
|
||
if (type == EE_CERT)
|
||
type = CA_CERT;
|
||
else if (type == PROXY_CERT)
|
||
proxy_cert_depth++;
|
||
}
|
||
|
||
/*
|
||
* Verify constraints, do this backward so path constraints are
|
||
* checked in the right order.
|
||
*/
|
||
|
||
for (ret = 0, i = path.len - 1; i >= 0; i--) {
|
||
Certificate *c;
|
||
|
||
c = _hx509_get_cert(path.val[i]);
|
||
|
||
#if 0
|
||
/* check that algorithm and parameters is the same */
|
||
/* XXX this is wrong */
|
||
ret = alg_cmp(&c->tbsCertificate.signature, alg_id);
|
||
if (ret) {
|
||
hx509_clear_error_string(context);
|
||
ret = HX509_PATH_ALGORITHM_CHANGED;
|
||
goto out;
|
||
}
|
||
#endif
|
||
|
||
/* verify name constraints, not for selfsigned and anchor */
|
||
if (!certificate_is_self_signed(c) || i == path.len - 1) {
|
||
ret = check_name_constraints(context, &nc, c);
|
||
if (ret) {
|
||
goto out;
|
||
}
|
||
}
|
||
ret = add_name_constraints(context, c, i == 0, &nc);
|
||
if (ret)
|
||
goto out;
|
||
|
||
/* XXX verify all other silly constraints */
|
||
|
||
}
|
||
|
||
/*
|
||
* Verify that no certificates has been revoked.
|
||
*/
|
||
|
||
if (ctx->revoke_ctx) {
|
||
hx509_certs certs;
|
||
|
||
ret = hx509_certs_init(context, "MEMORY:revoke-certs", 0,
|
||
NULL, &certs);
|
||
if (ret)
|
||
goto out;
|
||
|
||
for (i = 0; i < path.len; i++) {
|
||
ret = hx509_certs_add(context, certs, path.val[i]);
|
||
if (ret) {
|
||
hx509_certs_free(&certs);
|
||
goto out;
|
||
}
|
||
}
|
||
ret = hx509_certs_merge(context, certs, pool);
|
||
if (ret) {
|
||
hx509_certs_free(&certs);
|
||
goto out;
|
||
}
|
||
|
||
for (i = 0; i < path.len - 1; i++) {
|
||
int parent = (i < path.len - 1) ? i + 1 : i;
|
||
|
||
ret = hx509_revoke_verify(context,
|
||
ctx->revoke_ctx,
|
||
certs,
|
||
ctx->time_now,
|
||
path.val[i],
|
||
path.val[parent]);
|
||
if (ret) {
|
||
hx509_certs_free(&certs);
|
||
goto out;
|
||
}
|
||
}
|
||
hx509_certs_free(&certs);
|
||
}
|
||
|
||
#if 0
|
||
for (i = path.len - 1; i >= 0; i--) {
|
||
_hx509_print_cert_subject(path.val[i]);
|
||
}
|
||
#endif
|
||
|
||
/*
|
||
* Verify signatures, do this backward so public key working
|
||
* parameter is passed up from the anchor up though the chain.
|
||
*/
|
||
|
||
for (i = path.len - 1; i >= 0; i--) {
|
||
Certificate *signer, *c;
|
||
|
||
c = _hx509_get_cert(path.val[i]);
|
||
|
||
/* is last in chain (trust anchor) */
|
||
if (i == path.len - 1) {
|
||
signer = path.val[i]->data;
|
||
|
||
/* if trust anchor is not self signed, don't check sig */
|
||
if (!certificate_is_self_signed(signer))
|
||
continue;
|
||
} else {
|
||
/* take next certificate in chain */
|
||
signer = path.val[i + 1]->data;
|
||
}
|
||
|
||
/* verify signatureValue */
|
||
ret = _hx509_verify_signature_bitstring(signer,
|
||
&c->signatureAlgorithm,
|
||
&c->tbsCertificate._save,
|
||
&c->signatureValue);
|
||
if (ret) {
|
||
hx509_set_error_string(context, 0, ret,
|
||
"Failed to verify signature of certificate");
|
||
goto out;
|
||
}
|
||
}
|
||
|
||
out:
|
||
free_Name(&proxy_issuer);
|
||
free_name_constraints(&nc);
|
||
_hx509_path_free(&path);
|
||
|
||
return ret;
|
||
}
|
||
|
||
int
|
||
hx509_verify_signature(hx509_context context,
|
||
const hx509_cert signer,
|
||
const AlgorithmIdentifier *alg,
|
||
const heim_octet_string *data,
|
||
const heim_octet_string *sig)
|
||
{
|
||
return _hx509_verify_signature(signer->data, alg, data, sig);
|
||
}
|
||
|
||
int
|
||
hx509_verify_hostname(hx509_context context,
|
||
const hx509_cert cert,
|
||
int require_match,
|
||
const char *hostname,
|
||
const struct sockaddr *sa,
|
||
/* XXX krb5_socklen_t */ int sa_size)
|
||
{
|
||
if (sa && sa_size <= 0)
|
||
return EINVAL;
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
_hx509_set_cert_attribute(hx509_context context,
|
||
hx509_cert cert,
|
||
const heim_oid *oid,
|
||
const heim_octet_string *attr)
|
||
{
|
||
hx509_cert_attribute a;
|
||
void *d;
|
||
|
||
if (hx509_cert_get_attribute(cert, oid) != NULL)
|
||
return 0;
|
||
|
||
d = realloc(cert->attrs.val,
|
||
sizeof(cert->attrs.val[0]) * (cert->attrs.len + 1));
|
||
if (d == NULL) {
|
||
hx509_clear_error_string(context);
|
||
return ENOMEM;
|
||
}
|
||
cert->attrs.val = d;
|
||
|
||
a = malloc(sizeof(*a));
|
||
if (a == NULL)
|
||
return ENOMEM;
|
||
|
||
copy_octet_string(attr, &a->data);
|
||
copy_oid(oid, &a->oid);
|
||
|
||
cert->attrs.val[cert->attrs.len] = a;
|
||
cert->attrs.len++;
|
||
|
||
return 0;
|
||
}
|
||
|
||
hx509_cert_attribute
|
||
hx509_cert_get_attribute(hx509_cert cert, const heim_oid *oid)
|
||
{
|
||
int i;
|
||
for (i = 0; i < cert->attrs.len; i++)
|
||
if (heim_oid_cmp(oid, &cert->attrs.val[i]->oid) == 0)
|
||
return cert->attrs.val[i];
|
||
return NULL;
|
||
}
|
||
|
||
int
|
||
hx509_cert_set_friendly_name(hx509_cert cert, const char *name)
|
||
{
|
||
if (cert->friendlyname)
|
||
free(cert->friendlyname);
|
||
cert->friendlyname = strdup(name);
|
||
if (cert->friendlyname == NULL)
|
||
return ENOMEM;
|
||
return 0;
|
||
}
|
||
|
||
|
||
const char *
|
||
hx509_cert_get_friendly_name(hx509_cert cert)
|
||
{
|
||
hx509_cert_attribute a;
|
||
PKCS9_friendlyName n;
|
||
size_t sz;
|
||
int ret, i;
|
||
|
||
if (cert->friendlyname)
|
||
return cert->friendlyname;
|
||
|
||
a = hx509_cert_get_attribute(cert, oid_id_pkcs_9_at_friendlyName());
|
||
if (a == NULL) {
|
||
/* XXX use subject name ? */
|
||
return NULL;
|
||
}
|
||
|
||
ret = decode_PKCS9_friendlyName(a->data.data, a->data.length, &n, &sz);
|
||
if (ret)
|
||
return NULL;
|
||
|
||
if (n.len != 1) {
|
||
free_PKCS9_friendlyName(&n);
|
||
return NULL;
|
||
}
|
||
|
||
cert->friendlyname = malloc(n.val[0].length + 1);
|
||
if (cert->friendlyname == NULL) {
|
||
free_PKCS9_friendlyName(&n);
|
||
return NULL;
|
||
}
|
||
|
||
for (i = 0; i < n.val[0].length; i++) {
|
||
if (n.val[0].data[i] <= 0xff)
|
||
cert->friendlyname[i] = n.val[0].data[i] & 0xff;
|
||
else
|
||
cert->friendlyname[i] = 'X';
|
||
}
|
||
cert->friendlyname[i] = '\0';
|
||
free_PKCS9_friendlyName(&n);
|
||
|
||
return cert->friendlyname;
|
||
}
|
||
|
||
void
|
||
_hx509_query_clear(hx509_query *q)
|
||
{
|
||
memset(q, 0, sizeof(*q));
|
||
}
|
||
|
||
int
|
||
hx509_query_alloc(hx509_context context, hx509_query **q)
|
||
{
|
||
*q = calloc(1, sizeof(**q));
|
||
if (*q == NULL)
|
||
return ENOMEM;
|
||
return 0;
|
||
}
|
||
|
||
void
|
||
hx509_query_match_option(hx509_query *q, hx509_query_option option)
|
||
{
|
||
switch(option) {
|
||
case HX509_QUERY_OPTION_PRIVATE_KEY:
|
||
q->match |= HX509_QUERY_PRIVATE_KEY;
|
||
break;
|
||
case HX509_QUERY_OPTION_KU_ENCIPHERMENT:
|
||
q->match |= HX509_QUERY_KU_ENCIPHERMENT;
|
||
break;
|
||
case HX509_QUERY_OPTION_KU_DIGITALSIGNATURE:
|
||
q->match |= HX509_QUERY_KU_DIGITALSIGNATURE;
|
||
break;
|
||
case HX509_QUERY_OPTION_END:
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
|
||
int
|
||
hx509_query_match_friendly_name(hx509_query *q, const char *name)
|
||
{
|
||
if (q->friendlyname)
|
||
free(q->friendlyname);
|
||
q->friendlyname = strdup(name);
|
||
if (q->friendlyname == NULL)
|
||
return ENOMEM;
|
||
q->match |= HX509_QUERY_MATCH_FRIENDLY_NAME;
|
||
return 0;
|
||
}
|
||
|
||
void
|
||
hx509_query_free(hx509_context context, hx509_query *q)
|
||
{
|
||
if (q) {
|
||
free(q->friendlyname);
|
||
memset(q, 0, sizeof(*q));
|
||
}
|
||
free(q);
|
||
}
|
||
|
||
int
|
||
_hx509_query_match_cert(hx509_context context, const hx509_query *q, hx509_cert cert)
|
||
{
|
||
Certificate *c = _hx509_get_cert(cert);
|
||
|
||
if ((q->match & HX509_QUERY_FIND_ISSUER_CERT) &&
|
||
_hx509_cert_is_parent_cmp(q->subject, c, 0) != 0)
|
||
return 0;
|
||
|
||
if ((q->match & HX509_QUERY_MATCH_CERTIFICATE) &&
|
||
_hx509_Certificate_cmp(q->certificate, c) != 0)
|
||
return 0;
|
||
|
||
if ((q->match & HX509_QUERY_MATCH_SERIALNUMBER)
|
||
&& heim_integer_cmp(&c->tbsCertificate.serialNumber, q->serial) != 0)
|
||
return 0;
|
||
|
||
if ((q->match & HX509_QUERY_MATCH_ISSUER_NAME)
|
||
&& _hx509_name_cmp(&c->tbsCertificate.issuer, q->issuer_name) != 0)
|
||
return 0;
|
||
|
||
if ((q->match & HX509_QUERY_MATCH_SUBJECT_NAME)
|
||
&& _hx509_name_cmp(&c->tbsCertificate.subject, q->subject_name) != 0)
|
||
return 0;
|
||
|
||
if (q->match & HX509_QUERY_MATCH_SUBJECT_KEY_ID) {
|
||
SubjectKeyIdentifier si;
|
||
int ret;
|
||
|
||
ret = find_extension_subject_key_id(c, &si);
|
||
if (ret == 0) {
|
||
if (heim_octet_string_cmp(&si, q->subject_id) != 0)
|
||
ret = 1;
|
||
free_SubjectKeyIdentifier(&si);
|
||
}
|
||
if (ret)
|
||
return 0;
|
||
}
|
||
if ((q->match & HX509_QUERY_MATCH_ISSUER_ID))
|
||
return 0;
|
||
if ((q->match & HX509_QUERY_PRIVATE_KEY) &&
|
||
_hx509_cert_private_key(cert) == NULL)
|
||
return 0;
|
||
|
||
{
|
||
unsigned ku = 0;
|
||
if (q->match & HX509_QUERY_KU_DIGITALSIGNATURE)
|
||
ku |= (1 << 0);
|
||
if (q->match & HX509_QUERY_KU_NONREPUDIATION)
|
||
ku |= (1 << 1);
|
||
if (q->match & HX509_QUERY_KU_ENCIPHERMENT)
|
||
ku |= (1 << 2);
|
||
if (q->match & HX509_QUERY_KU_DATAENCIPHERMENT)
|
||
ku |= (1 << 3);
|
||
if (q->match & HX509_QUERY_KU_KEYAGREEMENT)
|
||
ku |= (1 << 4);
|
||
if (q->match & HX509_QUERY_KU_KEYCERTSIGN)
|
||
ku |= (1 << 5);
|
||
if (q->match & HX509_QUERY_KU_CRLSIGN)
|
||
ku |= (1 << 6);
|
||
if (ku && check_key_usage(context, c, ku, TRUE))
|
||
return 0;
|
||
}
|
||
if ((q->match & HX509_QUERY_ANCHOR))
|
||
return 0;
|
||
|
||
if (q->match & HX509_QUERY_MATCH_LOCAL_KEY_ID) {
|
||
hx509_cert_attribute a;
|
||
|
||
a = hx509_cert_get_attribute(cert, oid_id_pkcs_9_at_localKeyId());
|
||
if (a == NULL)
|
||
return 0;
|
||
if (heim_octet_string_cmp(&a->data, q->local_key_id) != 0)
|
||
return 0;
|
||
}
|
||
|
||
if (q->match & HX509_QUERY_NO_MATCH_PATH) {
|
||
size_t i;
|
||
|
||
for (i = 0; i < q->path->len; i++)
|
||
if (hx509_cert_cmp(q->path->val[i], cert) == 0)
|
||
return 0;
|
||
}
|
||
if (q->match & HX509_QUERY_MATCH_FRIENDLY_NAME) {
|
||
const char *name = hx509_cert_get_friendly_name(cert);
|
||
if (name == NULL)
|
||
return 0;
|
||
if (strcasecmp(q->friendlyname, name) != 0)
|
||
return 0;
|
||
}
|
||
if (q->match & HX509_QUERY_MATCH_FUNCTION) {
|
||
int ret = (*q->cmp_func)(cert);
|
||
if (ret != 0)
|
||
return 0;
|
||
}
|
||
|
||
if (q->match & HX509_QUERY_MATCH_KEY_HASH_SHA1) {
|
||
heim_octet_string os;
|
||
int ret;
|
||
|
||
os.data = c->tbsCertificate.subjectPublicKeyInfo.subjectPublicKey.data;
|
||
os.length =
|
||
c->tbsCertificate.subjectPublicKeyInfo.subjectPublicKey.length / 8;
|
||
|
||
ret = _hx509_verify_signature(NULL,
|
||
hx509_signature_sha1(),
|
||
&os,
|
||
q->keyhash_sha1);
|
||
if (ret != 0)
|
||
return 0;
|
||
}
|
||
|
||
|
||
if (q->match & ~HX509_QUERY_MASK)
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|
||
int
|
||
hx509_cert_check_eku(hx509_context context, hx509_cert cert,
|
||
const heim_oid *eku, int allow_any_eku)
|
||
{
|
||
ExtKeyUsage e;
|
||
int ret, i;
|
||
|
||
ret = find_extension_eku(_hx509_get_cert(cert), &e);
|
||
if (ret) {
|
||
hx509_clear_error_string(context);
|
||
return ret;
|
||
}
|
||
|
||
for (i = 0; i < e.len; i++) {
|
||
if (heim_oid_cmp(eku, &e.val[i]) == 0) {
|
||
free_ExtKeyUsage(&e);
|
||
return 0;
|
||
}
|
||
if (allow_any_eku) {
|
||
#if 0
|
||
if (heim_oid_cmp(id_any_eku, &e.val[i]) == 0) {
|
||
free_ExtKeyUsage(&e);
|
||
return 0;
|
||
}
|
||
#endif
|
||
}
|
||
}
|
||
free_ExtKeyUsage(&e);
|
||
hx509_clear_error_string(context);
|
||
return HX509_CERTIFICATE_MISSING_EKU;
|
||
}
|