2 * Written by Matt Caswell for the OpenSSL project.
4 /* ====================================================================
5 * Copyright (c) 1998-2015 The OpenSSL Project. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * openssl-core@openssl.org.
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
33 * 6. Redistributions of any form whatsoever must retain the following
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
59 #include <openssl/crypto.h>
60 #include <openssl/bio.h>
61 #include <openssl/x509.h>
62 #include <openssl/pem.h>
63 #include <openssl/err.h>
65 static STACK_OF(X509) *load_certs_from_file(const char *filename)
67 STACK_OF(X509) *certs;
71 bio = BIO_new_file(filename, "r");
77 certs = sk_X509_new_null();
85 x = PEM_read_bio_X509(bio, NULL, 0, NULL);
86 if (x != NULL && !sk_X509_push(certs, x)) {
87 sk_X509_pop_free(certs, X509_free);
90 } else if (x == NULL) {
92 * We probably just ran out of certs, so ignore any errors
105 * Test for CVE-2015-1793 (Alternate Chains Certificate Forgery)
107 * Chain is as follows:
109 * rootCA (self-signed)
113 * subinterCA subinterCA (self-signed)
115 * leaf ------------------
119 * rootCA, interCA, subinterCA, subinterCA (ss) all have CA=TRUE
120 * leaf and bad have CA=FALSE
122 * subinterCA and subinterCA (ss) have the same subject name and keys
124 * interCA (but not rootCA) and subinterCA (ss) are in the trusted store
126 * leaf and subinterCA are in the untrusted list (untrusted.pem)
127 * bad is the certificate being verified (bad.pem)
129 * Versions vulnerable to CVE-2015-1793 will fail to detect that leaf has
130 * CA=FALSE, and will therefore incorrectly verify bad
133 static int test_alt_chains_cert_forgery(void)
138 STACK_OF(X509) *untrusted = NULL;
140 X509_STORE_CTX *sctx = NULL;
141 X509_STORE *store = NULL;
142 X509_LOOKUP *lookup = NULL;
144 store = X509_STORE_new();
148 lookup = X509_STORE_add_lookup(store, X509_LOOKUP_file());
151 if(!X509_LOOKUP_load_file(lookup, "certs/roots.pem", X509_FILETYPE_PEM))
154 untrusted = load_certs_from_file("certs/untrusted.pem");
156 if ((bio = BIO_new_file("certs/bad.pem", "r")) == NULL)
159 if((x = PEM_read_bio_X509(bio, NULL, 0, NULL)) == NULL)
162 sctx = X509_STORE_CTX_new();
166 if (!X509_STORE_CTX_init(sctx, store, x, untrusted))
169 i = X509_verify_cert(sctx);
171 if(i == 0 && X509_STORE_CTX_get_error(sctx) == X509_V_ERR_INVALID_CA) {
172 /* This is the result we were expecting: Test passed */
176 X509_STORE_CTX_free(sctx);
179 sk_X509_pop_free(untrusted, X509_free);
180 X509_STORE_free(store);
182 ERR_print_errors_fp(stderr);
188 CRYPTO_malloc_debug_init();
189 CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
190 CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
192 ERR_load_crypto_strings();
193 OpenSSL_add_all_digests();
195 if (!test_alt_chains_cert_forgery()) {
196 fprintf(stderr, "Test alt chains cert forgery failed\n");
201 CRYPTO_cleanup_all_ex_data();
202 ERR_remove_thread_state(NULL);
204 CRYPTO_mem_leaks_fp(stderr);