692 lines
17 KiB
C
692 lines
17 KiB
C
/* pcy_tree.c */
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/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
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* project 2004.
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*/
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/* ====================================================================
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* Copyright (c) 2004 The OpenSSL Project. 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
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include "cryptlib.h"
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#include <openssl/x509.h>
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#include <openssl/x509v3.h>
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#include "pcy_int.h"
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/* Initialize policy tree. Return values:
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* 0 Some internal error occured.
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* -1 Inconsistent or invalid extensions in certificates.
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* 1 Tree initialized OK.
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* 2 Policy tree is empty.
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* 5 Tree OK and requireExplicitPolicy true.
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* 6 Tree empty and requireExplicitPolicy true.
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*/
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static int tree_init(X509_POLICY_TREE **ptree, STACK_OF(X509) *certs,
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unsigned int flags)
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{
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X509_POLICY_TREE *tree;
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X509_POLICY_LEVEL *level;
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const X509_POLICY_CACHE *cache;
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X509_POLICY_DATA *data = NULL;
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X509 *x;
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int ret = 1;
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int i, n;
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int explicit_policy;
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int any_skip;
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int map_skip;
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*ptree = NULL;
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n = sk_X509_num(certs);
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/* Disable policy mapping for now... */
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flags |= X509_V_FLAG_INHIBIT_MAP;
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if (flags & X509_V_FLAG_EXPLICIT_POLICY)
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explicit_policy = 0;
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else
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explicit_policy = n + 1;
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if (flags & X509_V_FLAG_INHIBIT_ANY)
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any_skip = 0;
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else
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any_skip = n + 1;
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if (flags & X509_V_FLAG_INHIBIT_MAP)
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map_skip = 0;
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else
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map_skip = n + 1;
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/* Can't do anything with just a trust anchor */
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if (n == 1)
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return 1;
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/* First setup policy cache in all certificates apart from the
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* trust anchor. Note any bad cache results on the way. Also can
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* calculate explicit_policy value at this point.
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*/
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for (i = n - 2; i >= 0; i--)
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{
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x = sk_X509_value(certs, i);
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X509_check_purpose(x, -1, -1);
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cache = policy_cache_set(x);
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/* If cache NULL something bad happened: return immediately */
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if (cache == NULL)
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return 0;
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/* If inconsistent extensions keep a note of it but continue */
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if (x->ex_flags & EXFLAG_INVALID_POLICY)
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ret = -1;
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/* Otherwise if we have no data (hence no CertificatePolicies)
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* and haven't already set an inconsistent code note it.
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*/
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else if ((ret == 1) && !cache->data)
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ret = 2;
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if (explicit_policy > 0)
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{
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explicit_policy--;
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if (!(x->ex_flags & EXFLAG_SS)
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&& (cache->explicit_skip != -1)
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&& (cache->explicit_skip < explicit_policy))
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explicit_policy = cache->explicit_skip;
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}
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}
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if (ret != 1)
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{
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if (ret == 2 && !explicit_policy)
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return 6;
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return ret;
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}
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/* If we get this far initialize the tree */
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tree = OPENSSL_malloc(sizeof(X509_POLICY_TREE));
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if (!tree)
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return 0;
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tree->flags = 0;
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tree->levels = OPENSSL_malloc(sizeof(X509_POLICY_LEVEL) * n);
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tree->nlevel = 0;
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tree->extra_data = NULL;
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tree->auth_policies = NULL;
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tree->user_policies = NULL;
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if (!tree)
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{
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OPENSSL_free(tree);
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return 0;
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}
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memset(tree->levels, 0, n * sizeof(X509_POLICY_LEVEL));
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tree->nlevel = n;
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level = tree->levels;
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/* Root data: initialize to anyPolicy */
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data = policy_data_new(NULL, OBJ_nid2obj(NID_any_policy), 0);
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if (!data || !level_add_node(level, data, NULL, tree))
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goto bad_tree;
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for (i = n - 2; i >= 0; i--)
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{
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level++;
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x = sk_X509_value(certs, i);
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cache = policy_cache_set(x);
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CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
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level->cert = x;
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if (!cache->anyPolicy)
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level->flags |= X509_V_FLAG_INHIBIT_ANY;
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/* Determine inhibit any and inhibit map flags */
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if (any_skip == 0)
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{
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/* Any matching allowed if certificate is self
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* issued and not the last in the chain.
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*/
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if (!(x->ex_flags & EXFLAG_SS) || (i == 0))
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level->flags |= X509_V_FLAG_INHIBIT_ANY;
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}
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else
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{
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any_skip--;
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if ((cache->any_skip > 0)
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&& (cache->any_skip < any_skip))
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any_skip = cache->any_skip;
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}
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if (map_skip == 0)
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level->flags |= X509_V_FLAG_INHIBIT_MAP;
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else
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{
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map_skip--;
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if ((cache->map_skip > 0)
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&& (cache->map_skip < map_skip))
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map_skip = cache->map_skip;
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}
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}
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*ptree = tree;
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if (explicit_policy)
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return 1;
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else
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return 5;
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bad_tree:
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X509_policy_tree_free(tree);
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return 0;
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}
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/* This corresponds to RFC3280 XXXX XXXXX:
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* link any data from CertificatePolicies onto matching parent
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* or anyPolicy if no match.
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*/
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static int tree_link_nodes(X509_POLICY_LEVEL *curr,
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const X509_POLICY_CACHE *cache)
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{
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int i;
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X509_POLICY_LEVEL *last;
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X509_POLICY_DATA *data;
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X509_POLICY_NODE *parent;
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last = curr - 1;
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for (i = 0; i < sk_X509_POLICY_DATA_num(cache->data); i++)
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{
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data = sk_X509_POLICY_DATA_value(cache->data, i);
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/* If a node is mapped any it doesn't have a corresponding
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* CertificatePolicies entry.
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* However such an identical node would be created
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* if anyPolicy matching is enabled because there would be
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* no match with the parent valid_policy_set. So we create
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* link because then it will have the mapping flags
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* right and we can prune it later.
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*/
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if ((data->flags & POLICY_DATA_FLAG_MAPPED_ANY)
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&& !(curr->flags & X509_V_FLAG_INHIBIT_ANY))
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continue;
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/* Look for matching node in parent */
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parent = level_find_node(last, data->valid_policy);
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/* If no match link to anyPolicy */
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if (!parent)
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parent = last->anyPolicy;
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if (parent && !level_add_node(curr, data, parent, NULL))
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return 0;
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}
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return 1;
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}
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/* This corresponds to RFC3280 XXXX XXXXX:
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* Create new data for any unmatched policies in the parent and link
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* to anyPolicy.
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*/
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static int tree_link_any(X509_POLICY_LEVEL *curr,
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const X509_POLICY_CACHE *cache,
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X509_POLICY_TREE *tree)
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{
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int i;
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X509_POLICY_DATA *data;
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X509_POLICY_NODE *node;
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X509_POLICY_LEVEL *last;
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last = curr - 1;
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for (i = 0; i < sk_X509_POLICY_NODE_num(last->nodes); i++)
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{
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node = sk_X509_POLICY_NODE_value(last->nodes, i);
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/* Skip any node with any children: we only want unmathced
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* nodes.
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*
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* Note: need something better for policy mapping
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* because each node may have multiple children
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*/
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if (node->nchild)
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continue;
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/* Create a new node with qualifiers from anyPolicy and
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* id from unmatched node.
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*/
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data = policy_data_new(NULL, node->data->valid_policy,
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node_critical(node));
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if (data == NULL)
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return 0;
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data->qualifier_set = curr->anyPolicy->data->qualifier_set;
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data->flags |= POLICY_DATA_FLAG_SHARED_QUALIFIERS;
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if (!level_add_node(curr, data, node, tree))
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{
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policy_data_free(data);
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return 0;
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}
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}
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/* Finally add link to anyPolicy */
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if (last->anyPolicy)
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{
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if (!level_add_node(curr, cache->anyPolicy,
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last->anyPolicy, NULL))
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return 0;
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}
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return 1;
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}
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/* Prune the tree: delete any child mapped child data on the current level
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* then proceed up the tree deleting any data with no children. If we ever
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* have no data on a level we can halt because the tree will be empty.
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*/
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static int tree_prune(X509_POLICY_TREE *tree, X509_POLICY_LEVEL *curr)
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{
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X509_POLICY_NODE *node;
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int i;
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for (i = sk_X509_POLICY_NODE_num(curr->nodes) - 1; i >= 0; i--)
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{
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node = sk_X509_POLICY_NODE_value(curr->nodes, i);
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/* Delete any mapped data: see RFC3280 XXXX */
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if (node->data->flags & POLICY_DATA_FLAG_MAP_MASK)
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{
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node->parent->nchild--;
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OPENSSL_free(node);
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(void)sk_X509_POLICY_NODE_delete(curr->nodes, i);
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}
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}
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for(;;) {
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--curr;
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for (i = sk_X509_POLICY_NODE_num(curr->nodes) - 1; i >= 0; i--)
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{
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node = sk_X509_POLICY_NODE_value(curr->nodes, i);
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if (node->nchild == 0)
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{
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node->parent->nchild--;
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OPENSSL_free(node);
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(void)sk_X509_POLICY_NODE_delete(curr->nodes, i);
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}
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}
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if (curr->anyPolicy && !curr->anyPolicy->nchild)
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{
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if (curr->anyPolicy->parent)
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curr->anyPolicy->parent->nchild--;
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OPENSSL_free(curr->anyPolicy);
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curr->anyPolicy = NULL;
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}
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if (curr == tree->levels)
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{
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/* If we zapped anyPolicy at top then tree is empty */
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if (!curr->anyPolicy)
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return 2;
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return 1;
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}
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}
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return 1;
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}
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static int tree_add_auth_node(STACK_OF(X509_POLICY_NODE) **pnodes,
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X509_POLICY_NODE *pcy)
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{
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if (!*pnodes)
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{
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*pnodes = policy_node_cmp_new();
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if (!*pnodes)
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return 0;
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}
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else if (sk_X509_POLICY_NODE_find(*pnodes, pcy) != -1)
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return 1;
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if (!sk_X509_POLICY_NODE_push(*pnodes, pcy))
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return 0;
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return 1;
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}
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/* Calculate the authority set based on policy tree.
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* The 'pnodes' parameter is used as a store for the set of policy nodes
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* used to calculate the user set. If the authority set is not anyPolicy
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* then pnodes will just point to the authority set. If however the authority
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* set is anyPolicy then the set of valid policies (other than anyPolicy)
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* is store in pnodes. The return value of '2' is used in this case to indicate
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* that pnodes should be freed.
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*/
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static int tree_calculate_authority_set(X509_POLICY_TREE *tree,
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STACK_OF(X509_POLICY_NODE) **pnodes)
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{
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X509_POLICY_LEVEL *curr;
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X509_POLICY_NODE *node, *anyptr;
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STACK_OF(X509_POLICY_NODE) **addnodes;
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int i, j;
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curr = tree->levels + tree->nlevel - 1;
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/* If last level contains anyPolicy set is anyPolicy */
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if (curr->anyPolicy)
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{
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if (!tree_add_auth_node(&tree->auth_policies, curr->anyPolicy))
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return 0;
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addnodes = pnodes;
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}
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else
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/* Add policies to authority set */
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addnodes = &tree->auth_policies;
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curr = tree->levels;
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for (i = 1; i < tree->nlevel; i++)
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{
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/* If no anyPolicy node on this this level it can't
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* appear on lower levels so end search.
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*/
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if (!(anyptr = curr->anyPolicy))
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break;
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curr++;
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for (j = 0; j < sk_X509_POLICY_NODE_num(curr->nodes); j++)
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{
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node = sk_X509_POLICY_NODE_value(curr->nodes, j);
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if ((node->parent == anyptr)
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&& !tree_add_auth_node(addnodes, node))
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return 0;
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}
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}
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if (addnodes == pnodes)
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return 2;
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*pnodes = tree->auth_policies;
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return 1;
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}
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static int tree_calculate_user_set(X509_POLICY_TREE *tree,
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STACK_OF(ASN1_OBJECT) *policy_oids,
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STACK_OF(X509_POLICY_NODE) *auth_nodes)
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{
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int i;
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X509_POLICY_NODE *node;
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ASN1_OBJECT *oid;
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X509_POLICY_NODE *anyPolicy;
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X509_POLICY_DATA *extra;
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/* Check if anyPolicy present in authority constrained policy set:
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* this will happen if it is a leaf node.
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*/
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if (sk_ASN1_OBJECT_num(policy_oids) <= 0)
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return 1;
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anyPolicy = tree->levels[tree->nlevel - 1].anyPolicy;
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for (i = 0; i < sk_ASN1_OBJECT_num(policy_oids); i++)
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{
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oid = sk_ASN1_OBJECT_value(policy_oids, i);
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if (OBJ_obj2nid(oid) == NID_any_policy)
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{
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tree->flags |= POLICY_FLAG_ANY_POLICY;
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return 1;
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}
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}
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for (i = 0; i < sk_ASN1_OBJECT_num(policy_oids); i++)
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{
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oid = sk_ASN1_OBJECT_value(policy_oids, i);
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node = tree_find_sk(auth_nodes, oid);
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if (!node)
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{
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if (!anyPolicy)
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continue;
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/* Create a new node with policy ID from user set
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* and qualifiers from anyPolicy.
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*/
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extra = policy_data_new(NULL, oid,
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node_critical(anyPolicy));
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if (!extra)
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return 0;
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extra->qualifier_set = anyPolicy->data->qualifier_set;
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extra->flags = POLICY_DATA_FLAG_SHARED_QUALIFIERS
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| POLICY_DATA_FLAG_EXTRA_NODE;
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node = level_add_node(NULL, extra, anyPolicy->parent,
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tree);
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}
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if (!tree->user_policies)
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{
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tree->user_policies = sk_X509_POLICY_NODE_new_null();
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if (!tree->user_policies)
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return 1;
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}
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if (!sk_X509_POLICY_NODE_push(tree->user_policies, node))
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return 0;
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}
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return 1;
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}
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static int tree_evaluate(X509_POLICY_TREE *tree)
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{
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int ret, i;
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X509_POLICY_LEVEL *curr = tree->levels + 1;
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const X509_POLICY_CACHE *cache;
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for(i = 1; i < tree->nlevel; i++, curr++)
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{
|
|
cache = policy_cache_set(curr->cert);
|
|
if (!tree_link_nodes(curr, cache))
|
|
return 0;
|
|
|
|
if (!(curr->flags & X509_V_FLAG_INHIBIT_ANY)
|
|
&& !tree_link_any(curr, cache, tree))
|
|
return 0;
|
|
ret = tree_prune(tree, curr);
|
|
if (ret != 1)
|
|
return ret;
|
|
}
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
static void exnode_free(X509_POLICY_NODE *node)
|
|
{
|
|
if (node->data && (node->data->flags & POLICY_DATA_FLAG_EXTRA_NODE))
|
|
OPENSSL_free(node);
|
|
}
|
|
|
|
|
|
void X509_policy_tree_free(X509_POLICY_TREE *tree)
|
|
{
|
|
X509_POLICY_LEVEL *curr;
|
|
int i;
|
|
|
|
if (!tree)
|
|
return;
|
|
|
|
sk_X509_POLICY_NODE_free(tree->auth_policies);
|
|
sk_X509_POLICY_NODE_pop_free(tree->user_policies, exnode_free);
|
|
|
|
for(i = 0, curr = tree->levels; i < tree->nlevel; i++, curr++)
|
|
{
|
|
if (curr->cert)
|
|
X509_free(curr->cert);
|
|
if (curr->nodes)
|
|
sk_X509_POLICY_NODE_pop_free(curr->nodes,
|
|
policy_node_free);
|
|
if (curr->anyPolicy)
|
|
policy_node_free(curr->anyPolicy);
|
|
}
|
|
|
|
if (tree->extra_data)
|
|
sk_X509_POLICY_DATA_pop_free(tree->extra_data,
|
|
policy_data_free);
|
|
|
|
OPENSSL_free(tree->levels);
|
|
OPENSSL_free(tree);
|
|
|
|
}
|
|
|
|
/* Application policy checking function.
|
|
* Return codes:
|
|
* 0 Internal Error.
|
|
* 1 Successful.
|
|
* -1 One or more certificates contain invalid or inconsistent extensions
|
|
* -2 User constrained policy set empty and requireExplicit true.
|
|
*/
|
|
|
|
int X509_policy_check(X509_POLICY_TREE **ptree, int *pexplicit_policy,
|
|
STACK_OF(X509) *certs,
|
|
STACK_OF(ASN1_OBJECT) *policy_oids,
|
|
unsigned int flags)
|
|
{
|
|
int ret;
|
|
X509_POLICY_TREE *tree = NULL;
|
|
STACK_OF(X509_POLICY_NODE) *nodes, *auth_nodes = NULL;
|
|
*ptree = NULL;
|
|
|
|
*pexplicit_policy = 0;
|
|
ret = tree_init(&tree, certs, flags);
|
|
|
|
|
|
switch (ret)
|
|
{
|
|
|
|
/* Tree empty requireExplicit False: OK */
|
|
case 2:
|
|
return 1;
|
|
|
|
/* Some internal error */
|
|
case 0:
|
|
return 0;
|
|
|
|
/* Tree empty requireExplicit True: Error */
|
|
|
|
case 6:
|
|
*pexplicit_policy = 1;
|
|
return -2;
|
|
|
|
/* Tree OK requireExplicit True: OK and continue */
|
|
case 5:
|
|
*pexplicit_policy = 1;
|
|
break;
|
|
|
|
/* Tree OK: continue */
|
|
|
|
case 1:
|
|
if (!tree)
|
|
/*
|
|
* tree_init() returns success and a null tree
|
|
* if it's just looking at a trust anchor.
|
|
* I'm not sure that returning success here is
|
|
* correct, but I'm sure that reporting this
|
|
* as an internal error which our caller
|
|
* interprets as a malloc failure is wrong.
|
|
*/
|
|
return 1;
|
|
break;
|
|
}
|
|
|
|
if (!tree) goto error;
|
|
ret = tree_evaluate(tree);
|
|
|
|
if (ret <= 0)
|
|
goto error;
|
|
|
|
/* Return value 2 means tree empty */
|
|
if (ret == 2)
|
|
{
|
|
X509_policy_tree_free(tree);
|
|
if (*pexplicit_policy)
|
|
return -2;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
/* Tree is not empty: continue */
|
|
|
|
ret = tree_calculate_authority_set(tree, &auth_nodes);
|
|
|
|
if (!ret)
|
|
goto error;
|
|
|
|
if (!tree_calculate_user_set(tree, policy_oids, auth_nodes))
|
|
goto error;
|
|
|
|
if (ret == 2)
|
|
sk_X509_POLICY_NODE_free(auth_nodes);
|
|
|
|
if (tree)
|
|
*ptree = tree;
|
|
|
|
if (*pexplicit_policy)
|
|
{
|
|
nodes = X509_policy_tree_get0_user_policies(tree);
|
|
if (sk_X509_POLICY_NODE_num(nodes) <= 0)
|
|
return -2;
|
|
}
|
|
|
|
return 1;
|
|
|
|
error:
|
|
|
|
X509_policy_tree_free(tree);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|