verify_extra_test.c revision 296341 
1/*
2 * Written by Matt Caswell for the OpenSSL project.
3 */
4/* ====================================================================
5 * Copyright (c) 1998-2015 The OpenSSL Project.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 *
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
17 *    distribution.
18 *
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/)"
23 *
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.
28 *
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.
32 *
33 * 6. Redistributions of any form whatsoever must retain the following
34 *    acknowledgment:
35 *    "This product includes software developed by the OpenSSL Project
36 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
37 *
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)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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 * ====================================================================
51 *
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).
55 *
56 */
57
58#include <stdio.h>
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>
64
65static STACK_OF(X509) *load_certs_from_file(const char *filename)
66{
67    STACK_OF(X509) *certs;
68    BIO *bio;
69    X509 *x;
70
71    bio = BIO_new_file(filename, "r");
72
73    if (bio == NULL) {
74        return NULL;
75    }
76
77    certs = sk_X509_new_null();
78    if (certs == NULL) {
79        BIO_free(bio);
80        return NULL;
81    }
82
83    ERR_set_mark();
84    do {
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);
88            BIO_free(bio);
89            return NULL;
90        } else if (x == NULL) {
91            /*
92             * We probably just ran out of certs, so ignore any errors
93             * generated
94             */
95            ERR_pop_to_mark();
96        }
97    } while (x != NULL);
98
99    BIO_free(bio);
100
101    return certs;
102}
103
104/*
105 * Test for CVE-2015-1793 (Alternate Chains Certificate Forgery)
106 *
107 * Chain is as follows:
108 *
109 * rootCA (self-signed)
110 *   |
111 * interCA
112 *   |
113 * subinterCA       subinterCA (self-signed)
114 *   |                   |
115 * leaf ------------------
116 *   |
117 * bad
118 *
119 * rootCA, interCA, subinterCA, subinterCA (ss) all have CA=TRUE
120 * leaf and bad have CA=FALSE
121 *
122 * subinterCA and subinterCA (ss) have the same subject name and keys
123 *
124 * interCA (but not rootCA) and subinterCA (ss) are in the trusted store
125 * (roots.pem)
126 * leaf and subinterCA are in the untrusted list (untrusted.pem)
127 * bad is the certificate being verified (bad.pem)
128 *
129 * Versions vulnerable to CVE-2015-1793 will fail to detect that leaf has
130 * CA=FALSE, and will therefore incorrectly verify bad
131 *
132 */
133static int test_alt_chains_cert_forgery(void)
134{
135    int ret = 0;
136    int i;
137    X509 *x = NULL;
138    STACK_OF(X509) *untrusted = NULL;
139    BIO *bio = NULL;
140    X509_STORE_CTX *sctx = NULL;
141    X509_STORE *store = NULL;
142    X509_LOOKUP *lookup = NULL;
143
144    store = X509_STORE_new();
145    if (store == NULL)
146        goto err;
147
148    lookup = X509_STORE_add_lookup(store, X509_LOOKUP_file());
149    if (lookup == NULL)
150        goto err;
151    if(!X509_LOOKUP_load_file(lookup, "certs/roots.pem", X509_FILETYPE_PEM))
152        goto err;
153
154    untrusted = load_certs_from_file("certs/untrusted.pem");
155
156    if ((bio = BIO_new_file("certs/bad.pem", "r")) == NULL)
157        goto err;
158
159    if((x = PEM_read_bio_X509(bio, NULL, 0, NULL)) == NULL)
160        goto err;
161
162    sctx = X509_STORE_CTX_new();
163    if (sctx == NULL)
164        goto err;
165
166    if (!X509_STORE_CTX_init(sctx, store, x, untrusted))
167        goto err;
168
169    i = X509_verify_cert(sctx);
170
171    if(i == 0 && X509_STORE_CTX_get_error(sctx)
172                 == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT) {
173        /* This is the result we were expecting: Test passed */
174        ret = 1;
175    }
176 err:
177    X509_STORE_CTX_free(sctx);
178    X509_free(x);
179    BIO_free(bio);
180    sk_X509_pop_free(untrusted, X509_free);
181    X509_STORE_free(store);
182    if (ret != 1)
183        ERR_print_errors_fp(stderr);
184    return ret;
185}
186
187int main(void)
188{
189    CRYPTO_malloc_debug_init();
190    CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
191    CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
192
193    ERR_load_crypto_strings();
194    OpenSSL_add_all_digests();
195
196    if (!test_alt_chains_cert_forgery()) {
197        fprintf(stderr, "Test alt chains cert forgery failed\n");
198        return 1;
199    }
200
201    EVP_cleanup();
202    CRYPTO_cleanup_all_ex_data();
203    ERR_remove_thread_state(NULL);
204    ERR_free_strings();
205    CRYPTO_mem_leaks_fp(stderr);
206
207    printf("PASS\n");
208    return 0;
209}
210