stand-alone vulnerability tester for: CVE-2015-1793

altchainfail.c

/*
 *                        alt.chain.fail 
 *     stand-alone vulnerability tester for: CVE-2015-1793
 *                   by: mancha (@mancha140)
 *
 * based on test written by Matt Caswell for the OpenSSL project.
 *
 *           gcc -o altchainfail altchainfail.c -lcrypto
 *
 */

/* ====================================================================
 * Copyright (c) 1998-2015 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include <string.h>
#include <openssl/crypto.h>
#include <openssl/bio.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/err.h>

const char *root1=
"-----BEGIN CERTIFICATE-----\n"
"MIIDgDCCAmigAwIBAgIJANnoWlLlEsTgMA0GCSqGSIb3DQEBCwUAMFYxCzAJBgNV\n"
"BAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBX\n"
"aWRnaXRzIFB0eSBMdGQxDzANBgNVBAMMBnJvb3RDQTAeFw0xNTA3MDIxMzE3MDVa\n"
"Fw0zNTA3MDIxMzE3MDVaMFcxCzAJBgNVBAYTAkFVMRMwEQYDVQQIEwpTb21lLVN0\n"
"YXRlMSEwHwYDVQQKExhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxEDAOBgNVBAMT\n"
"B2ludGVyQ0EwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC7s0ejvpQO\n"
"nvfwD+e4R+9WQovtrsqOTw8khiREqi5JlmAFbpDEFam18npRkt6gOcGMnjuFzuz6\n"
"iEuQmeeyh0BqWAwpMgWMMteEzLOAaqkEl//J2+WgRbA/8pmwHfbPW/d+f3bp64Fo\n"
"D1hQAenBzXmLxVohEQ9BA+xEDRkL/cA3Y+k/O1C9ORhSQrJNsB9aE3zKbFHd9mOm\n"
"H4aNSsF8On3SqlRVOCQine5c6ACSd0HUEjYy9aObqY47ySNULbzVq5y6VOjMs0W+\n"
"2G/XqrcVkxzf9bVqyVBrrAJrnb35/y/iK0zWgJBP+HXhwr5mMTvNuEirBeVYuz+6\n"
"hUerUbuJhr0FAgMBAAGjUDBOMAwGA1UdEwQFMAMBAf8wHQYDVR0OBBYEFBj61iO5\n"
"j11dE30+j6iRx9lhwBcuMB8GA1UdIwQYMBaAFIVWiTXinwAa4YYDC0uvdhJrM239\n"
"MA0GCSqGSIb3DQEBCwUAA4IBAQDAU0MvL/yZpmibhxUsoSsa97UJbejn5IbxpPzZ\n"
"4WHw8lsoUGs12ZHzQJ9LxkZVeuccFXy9yFEHW56GTlkBmD2qrddlmQCfQ3m8jtZ9\n"
"Hh5feKAyrqfmfsWF5QPjAmdj/MFdq+yMJVosDftkmUmaBHjzbvbcq1sWh/6drH8U\n"
"7pdYRpfeEY8dHSU6FHwVN/H8VaBB7vYYc2wXwtk8On7z2ocIVHn9RPkcLwmwJjb/\n"
"e4jmcYiyZev22KXQudeHc4w6crWiEFkVspomn5PqDmza3rkdB3baXFVZ6sd23ufU\n"
"wjkiKKtwRBwU+5tCCagQZoeQ5dZXQThkiH2XEIOCOLxyD/tb\n"
"-----END CERTIFICATE-----\n";

const char *root2=
"-----BEGIN CERTIFICATE-----\n"
"MIIDhzCCAm+gAwIBAgIJAJTed6XmFiu/MA0GCSqGSIb3DQEBCwUAMFoxCzAJBgNV\n"
"BAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBX\n"
"aWRnaXRzIFB0eSBMdGQxEzARBgNVBAMMCnN1YmludGVyQ0EwHhcNMTUwNzAyMTMy\n"
"MTU4WhcNMzUwNzAyMTMyMTU4WjBaMQswCQYDVQQGEwJBVTETMBEGA1UECAwKU29t\n"
"ZS1TdGF0ZTEhMB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMRMwEQYD\n"
"VQQDDApzdWJpbnRlckNBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA\n"
"/zQjvhbU7RWDsRaEkVUBZWR/PqZ49GoE9p3OyRN4pkt1c1yb2ARVkYZP5e9gHb04\n"
"wPVz2+FYy+2mNkl+uAZbcK5w5fWO3WJIEn57he4MkWu3ew1nJeSv3na8gyOoCheG\n"
"64kWVbA2YL92mR7QoSCo4SP7RmykLrwj6TlDxqgH6DxKSD/CpdCHE3DKAzAiri3G\n"
"Vc90OJAszYHlje4/maVIOayGROVET3xa5cbtRJl8IBgmqhMywtz4hhY/XZTvdEn2\n"
"90aL857Hk7JjogA7mLKi07yKzknMxHV+k6JX7xJEttkcNQRFHONWZG1T4mRY1Drh\n"
"6VbJGb+0GNIldNLQqigkfwIDAQABo1AwTjAMBgNVHRMEBTADAQH/MB0GA1UdDgQW\n"
"BBTpZ30QdMGarrhMPwk+HHAV3R8aTzAfBgNVHSMEGDAWgBTpZ30QdMGarrhMPwk+\n"
"HHAV3R8aTzANBgkqhkiG9w0BAQsFAAOCAQEAF8UAMtV1DClUWRw1h+THdAhjeo8S\n"
"9BOp6QphtlYuc9o+tQri5m+WqbyUZKIBEtumNhFb7QI1e4hO64y1kKbSs2AjWcJ2\n"
"QxAyGiMM3wl2UfxPohDtgNhm0GFgQ1tUTeSnW3kAom9NqI7U/2lPpLh4rrFYTepR\n"
"wy0FV3NpRuHPtJE0VfqYnwWiTRdCJ7w1XzknKOUSHP/hRbyJVlwQp3VEQ9SIOYU6\n"
"C+QEVGIgQiST6MRlCvoNP43guaRtrMuBZJaHKy/hLPvkdRpXHoUeKQFDuH77sZsF\n"
"sBv3EHNKoBvpSpSJndZN6UcH7Z1yn41Y6AnO4u492jiRAjQpP9+Nf/x1eg==\n"
"-----END CERTIFICATE-----\n";

const char *untrusted1=
"-----BEGIN CERTIFICATE-----\n"
"MIIDhDCCAmygAwIBAgIJAJkv2OGshkmUMA0GCSqGSIb3DQEBCwUAMFcxCzAJBgNV\n"
"BAYTAkFVMRMwEQYDVQQIEwpTb21lLVN0YXRlMSEwHwYDVQQKExhJbnRlcm5ldCBX\n"
"aWRnaXRzIFB0eSBMdGQxEDAOBgNVBAMTB2ludGVyQ0EwHhcNMTUwNzAyMTMxODIz\n"
"WhcNMzUwNzAyMTMxODIzWjBaMQswCQYDVQQGEwJBVTETMBEGA1UECBMKU29tZS1T\n"
"dGF0ZTEhMB8GA1UEChMYSW50ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMRMwEQYDVQQD\n"
"EwpzdWJpbnRlckNBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA/zQj\n"
"vhbU7RWDsRaEkVUBZWR/PqZ49GoE9p3OyRN4pkt1c1yb2ARVkYZP5e9gHb04wPVz\n"
"2+FYy+2mNkl+uAZbcK5w5fWO3WJIEn57he4MkWu3ew1nJeSv3na8gyOoCheG64kW\n"
"VbA2YL92mR7QoSCo4SP7RmykLrwj6TlDxqgH6DxKSD/CpdCHE3DKAzAiri3GVc90\n"
"OJAszYHlje4/maVIOayGROVET3xa5cbtRJl8IBgmqhMywtz4hhY/XZTvdEn290aL\n"
"857Hk7JjogA7mLKi07yKzknMxHV+k6JX7xJEttkcNQRFHONWZG1T4mRY1Drh6VbJ\n"
"Gb+0GNIldNLQqigkfwIDAQABo1AwTjAMBgNVHRMEBTADAQH/MB0GA1UdDgQWBBTp\n"
"Z30QdMGarrhMPwk+HHAV3R8aTzAfBgNVHSMEGDAWgBQY+tYjuY9dXRN9Po+okcfZ\n"
"YcAXLjANBgkqhkiG9w0BAQsFAAOCAQEAgVUsOf9rdHlQDw4clP8GMY7QahfXbvd8\n"
"8o++P18KeInQXH6+sCg0axZXzhOmKwn+Ina3EsOP7xk4aKIYwJ4A1xBuT7fKxquQ\n"
"pbJyjkEBsNRVLC9t4gOA0FC791v5bOCZjyff5uN+hy8r0828nVxha6CKLqwrPd+E\n"
"mC7DtilSZIgO2vwbTBL6ifmw9n1dd/Bl8Wdjnl7YJqTIf0Ozc2SZSMRUq9ryn4Wq\n"
"YrjRl8NwioGb1LfjEJ0wJi2ngL3IgaN94qmDn10OJs8hlsufwP1n+Bca3fsl0m5U\n"
"gUMG+CXxbF0kdCKZ9kQb1MJE4vOk6zfyBGQndmQnxHjt5botI/xpXg==\n"
"-----END CERTIFICATE-----\n";

const char *untrusted2=
"-----BEGIN CERTIFICATE-----\n"
"MIIDfjCCAmagAwIBAgIJAKRNsDKacUqNMA0GCSqGSIb3DQEBCwUAMFoxCzAJBgNV\n"
"BAYTAkFVMRMwEQYDVQQIEwpTb21lLVN0YXRlMSEwHwYDVQQKExhJbnRlcm5ldCBX\n"
"aWRnaXRzIFB0eSBMdGQxEzARBgNVBAMTCnN1YmludGVyQ0EwHhcNMTUwNzAyMTMx\n"
"OTQ5WhcNMzUwNzAyMTMxOTQ5WjBUMQswCQYDVQQGEwJBVTETMBEGA1UECBMKU29t\n"
"ZS1TdGF0ZTEhMB8GA1UEChMYSW50ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMQ0wCwYD\n"
"VQQDEwRsZWFmMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAv0Qo9WC/\n"
"BKA70LtQJdwVGSXqr9dut3cQmiFzTb/SaWldjOT1sRNDFxSzdTJjU/8cIDEZvaTI\n"
"wRxP/dtVQLjc+4jzrUwz93NuZYlsEWUEUg4Lrnfs0Nz50yHk4rJhVxWjb8Ii/wRB\n"
"ViWHFExP7CwTkXiTclC1bCqTuWkjxF3thTfTsttRyY7qNkz2JpNx0guD8v4otQoY\n"
"jA5AEZvK4IXLwOwxol5xBTMvIrvvff2kkh+c7OC2QVbUTow/oppjqIKCx2maNHCt\n"
"LFTJELf3fwtRJLJsy4fKGP0/6kpZc8Sp88WK4B4FauF9IV1CmoAJUC1vJxhagHIK\n"
"fVtFjUWs8GPobQIDAQABo00wSzAJBgNVHRMEAjAAMB0GA1UdDgQWBBQcHcT+8SVG\n"
"IRlN9YTuM9rlz7UZfzAfBgNVHSMEGDAWgBTpZ30QdMGarrhMPwk+HHAV3R8aTzAN\n"
"BgkqhkiG9w0BAQsFAAOCAQEAGjmSkF8is+v0/RLcnSRiCXENz+yNi4pFCAt6dOtT\n"
"6Gtpqa1tY5It9lVppfWb26JrygMIzOr/fB0r1Q7FtZ/7Ft3P6IXVdk3GDO0QsORD\n"
"2dRAejhYpc5c7joHxAw9oRfKrEqE+ihVPUTcfcIuBaalvuhkpQRmKP71ws5DVzOw\n"
"QhnMd0TtIrbKHaNQ4kNsmSY5fQolwB0LtNfTus7OEFdcZWhOXrWImKXN9jewPKdV\n"
"mSG34NfXOnA6qx0eQg06z+TkdrptH6j1Va2vS1/bL+h1GxjpTHlvTGaZYxaloIjw\n"
"y/EzY5jygRoABnR3eBm15CYZwwKL9izIq1H3OhymEi/Ycg==\n"
"-----END CERTIFICATE-----\n";

const char *bad=
"-----BEGIN CERTIFICATE-----\n"
"MIIDdzCCAl+gAwIBAgIJAJgwOOciuxjSMA0GCSqGSIb3DQEBCwUAMFQxCzAJBgNV\n"
"BAYTAkFVMRMwEQYDVQQIEwpTb21lLVN0YXRlMSEwHwYDVQQKExhJbnRlcm5ldCBX\n"
"aWRnaXRzIFB0eSBMdGQxDTALBgNVBAMTBGxlYWYwHhcNMTUwNzAyMTMyMDQ2WhcN\n"
"MzUwNzAyMTMyMDQ2WjBTMQswCQYDVQQGEwJBVTETMBEGA1UECBMKU29tZS1TdGF0\n"
"ZTEhMB8GA1UEChMYSW50ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMQwwCgYDVQQDEwNi\n"
"YWQwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDBOo2Sjm9CJDkFCiE8\n"
"nezJKuNPol52Owq23U5nyd1HYLVqxSIeClU7xAMcogPzxCSXHpQKJ54oDAhjRXOp\n"
"bNPJlZPB2pNT23xqsccm7shwWWZawAt/BOYBFYmalj4rx8adDHUrF+LqdAnxaGrh\n"
"twConYdfMbr1aOzcqLvRJw1tD1FTBcmf8V42uymEoC/krbbMGqNYBB1gyDq+0pkB\n"
"cIRPyPDo6Q9WdRv9C/KgESKNa3T4cGHvAuRJS8yP/t9zzz7G28apk/IbY/LgN1Zb\n"
"Wy2mCJndNOiESTzi3W7kvepBpFCZUTrLlEwibJVjyF6ALjNzpoZkMVG/wxH6CTqm\n"
"ty5TAgMBAAGjTTBLMAkGA1UdEwQCMAAwHQYDVR0OBBYEFJoH29IULbskIG8BwYp4\n"
"9yD+q7wbMB8GA1UdIwQYMBaAFBwdxP7xJUYhGU31hO4z2uXPtRl/MA0GCSqGSIb3\n"
"DQEBCwUAA4IBAQBl0tHkWMBHW6r3ywBlWWFdok04xlt2QD8eA4ywwz97t/8JgLht\n"
"OpuHO1bQtrZR6bxAgYT1+yHQnYBTfjKxFq+S9EP6nxBe94mEgizLmMv9pf7x5q+H\n"
"pfT8ejcY54E/oXlFXSbLDE1BDpfgkWll2/TIsTRJNoM2n8mytEdPqzRburwWnoFR\n"
"VchcfO968asdc9/8glSLJSNO+Wh9vQlbtcPzfbd4ZVE5E/P6drQzSwNjWvHQdswJ\n"
"ujkY1zkTP2rtVBGN4OyOfkE6enVKpt5lN6AqjEMhJ5i/yFM/jDndTrgd/JkAvyUJ\n"
"O2ELtifCd8DeSYNA9Qm8/MEUYq1xXQrGJHCE\n"
"-----END CERTIFICATE-----\n";

X509 *pem2X509(const char *pem)
{
    X509 *cert = NULL;
    BIO *bo = NULL;

    if((bo = BIO_new(BIO_s_mem())) == NULL)
        return NULL;
    BIO_write(bo, pem, strlen(pem));
    cert = PEM_read_bio_X509(bo, NULL, 0, NULL);
    BIO_free(bo);
    return cert;
}

static int test_alt_chains_cert_forgery(void)
{
    int ret = 0;
    int i;
    X509 *x = NULL;
    STACK_OF(X509) *untrusted = NULL;
    BIO *bio = NULL;
    X509_STORE_CTX *sctx = NULL;
    X509_STORE *store = NULL;

    store = X509_STORE_new();
    if (store == NULL)
        goto err;

    if(!X509_STORE_add_cert(store, pem2X509(root1)))
        goto err;
    if(!X509_STORE_add_cert(store, pem2X509(root2)))
        goto err;

    if((untrusted = sk_X509_new_null()) == NULL)
        goto err;
    if(!sk_X509_push(untrusted, pem2X509(untrusted1)))
        goto err;
    if(!sk_X509_push(untrusted, pem2X509(untrusted2)))
        goto err;

    if((x = pem2X509(bad)) == NULL)
        goto err;

    sctx = X509_STORE_CTX_new();
    if (sctx == NULL)
        goto err;

    if (!X509_STORE_CTX_init(sctx, store, x, untrusted))
        goto err;

    i = X509_verify_cert(sctx);

    if(i == 0 &&
     ((X509_STORE_CTX_get_error(sctx) == X509_V_ERR_INVALID_CA) ||
      (X509_STORE_CTX_get_error(sctx) == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT)))
        ret = 1;
 err:
    X509_STORE_CTX_free(sctx);
    X509_free(x);
    BIO_free(bio);
    sk_X509_pop_free(untrusted, X509_free);
    X509_STORE_free(store);
    return ret;
}

int main(void)
{
    if (!test_alt_chains_cert_forgery()) {
        fprintf(stderr, "VULNERABLE to alt.chain.fail (CVE-2015-1793)\n");
        return 1;
    }

    EVP_cleanup();
    ERR_remove_state(0);
    ERR_free_strings();

    printf("NOT vulnerable\n");
    return 0;
}