mirror of
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342 lines
8.7 KiB
C
342 lines
8.7 KiB
C
/*
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* Copyright 2015-2022 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <string.h>
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#include <openssl/crypto.h>
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#include <openssl/bio.h>
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#include <openssl/x509.h>
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#include <openssl/x509v3.h>
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#include <openssl/pem.h>
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#include <openssl/err.h>
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#include "testutil.h"
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static const char *certs_dir;
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static char *root_f = NULL;
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static char *roots_f = NULL;
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static char *untrusted_f = NULL;
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static char *bad_f = NULL;
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static char *req_f = NULL;
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static char *sroot_cert = NULL;
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static char *ca_cert = NULL;
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static char *ee_cert = NULL;
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#define load_cert_from_file(file) load_cert_pem(file, NULL)
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/*-
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* Test for CVE-2015-1793 (Alternate Chains Certificate Forgery)
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*
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* Chain is as follows:
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*
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* rootCA (self-signed)
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* |
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* interCA
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* |
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* subinterCA subinterCA (self-signed)
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* | |
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* leaf ------------------
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* |
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* bad
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*
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* rootCA, interCA, subinterCA, subinterCA (ss) all have CA=TRUE
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* leaf and bad have CA=FALSE
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*
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* subinterCA and subinterCA (ss) have the same subject name and keys
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*
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* interCA (but not rootCA) and subinterCA (ss) are in the trusted store
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* (roots.pem)
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* leaf and subinterCA are in the untrusted list (untrusted.pem)
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* bad is the certificate being verified (bad.pem)
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*
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* Versions vulnerable to CVE-2015-1793 will fail to detect that leaf has
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* CA=FALSE, and will therefore incorrectly verify bad
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*
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*/
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static int test_alt_chains_cert_forgery(void)
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{
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int ret = 0;
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int i;
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X509 *x = NULL;
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STACK_OF(X509) *untrusted = NULL;
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X509_STORE_CTX *sctx = NULL;
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X509_STORE *store = NULL;
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X509_LOOKUP *lookup = NULL;
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store = X509_STORE_new();
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if (store == NULL)
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goto err;
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lookup = X509_STORE_add_lookup(store, X509_LOOKUP_file());
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if (lookup == NULL)
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goto err;
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if (!X509_LOOKUP_load_file(lookup, roots_f, X509_FILETYPE_PEM))
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goto err;
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untrusted = load_certs_pem(untrusted_f);
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if ((x = load_cert_from_file(bad_f)) == NULL)
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goto err;
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sctx = X509_STORE_CTX_new();
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if (sctx == NULL)
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goto err;
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if (!X509_STORE_CTX_init(sctx, store, x, untrusted))
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goto err;
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i = X509_verify_cert(sctx);
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if (i == 0 && X509_STORE_CTX_get_error(sctx) == X509_V_ERR_INVALID_CA) {
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/* This is the result we were expecting: Test passed */
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ret = 1;
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}
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err:
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X509_STORE_CTX_free(sctx);
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X509_free(x);
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OSSL_STACK_OF_X509_free(untrusted);
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X509_STORE_free(store);
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return ret;
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}
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static int test_distinguishing_id(void)
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{
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X509 *x = NULL;
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int ret = 0;
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ASN1_OCTET_STRING *v = NULL, *v2 = NULL;
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char *distid = "this is an ID";
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x = load_cert_from_file(bad_f);
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if (x == NULL)
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goto err;
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v = ASN1_OCTET_STRING_new();
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if (v == NULL)
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goto err;
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if (!ASN1_OCTET_STRING_set(v, (unsigned char *)distid,
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(int)strlen(distid))) {
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ASN1_OCTET_STRING_free(v);
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goto err;
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}
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X509_set0_distinguishing_id(x, v);
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v2 = X509_get0_distinguishing_id(x);
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if (!TEST_ptr(v2)
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|| !TEST_int_eq(ASN1_OCTET_STRING_cmp(v, v2), 0))
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goto err;
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ret = 1;
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err:
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X509_free(x);
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return ret;
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}
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static int test_req_distinguishing_id(void)
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{
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X509_REQ *x = NULL;
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BIO *bio = NULL;
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int ret = 0;
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ASN1_OCTET_STRING *v = NULL, *v2 = NULL;
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char *distid = "this is an ID";
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bio = BIO_new_file(req_f, "r");
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if (bio == NULL)
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goto err;
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x = PEM_read_bio_X509_REQ(bio, NULL, 0, NULL);
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if (x == NULL)
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goto err;
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v = ASN1_OCTET_STRING_new();
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if (v == NULL)
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goto err;
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if (!ASN1_OCTET_STRING_set(v, (unsigned char *)distid,
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(int)strlen(distid))) {
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ASN1_OCTET_STRING_free(v);
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goto err;
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}
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X509_REQ_set0_distinguishing_id(x, v);
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v2 = X509_REQ_get0_distinguishing_id(x);
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if (!TEST_ptr(v2)
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|| !TEST_int_eq(ASN1_OCTET_STRING_cmp(v, v2), 0))
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goto err;
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ret = 1;
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err:
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X509_REQ_free(x);
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BIO_free(bio);
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return ret;
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}
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static int test_self_signed(const char *filename, int use_trusted, int expected)
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{
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X509 *cert = load_cert_from_file(filename); /* may result in NULL */
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STACK_OF(X509) *trusted = sk_X509_new_null();
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X509_STORE_CTX *ctx = X509_STORE_CTX_new();
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int ret;
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ret = TEST_int_eq(X509_self_signed(cert, 1), expected);
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if (cert != NULL) {
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if (use_trusted)
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ret = ret && TEST_true(sk_X509_push(trusted, cert));
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ret = ret && TEST_true(X509_STORE_CTX_init(ctx, NULL, cert, NULL));
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X509_STORE_CTX_set0_trusted_stack(ctx, trusted);
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ret = ret && TEST_int_eq(X509_verify_cert(ctx), expected);
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}
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X509_STORE_CTX_free(ctx);
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sk_X509_free(trusted);
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X509_free(cert);
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return ret;
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}
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static int test_self_signed_good(void)
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{
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return test_self_signed(root_f, 1, 1);
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}
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static int test_self_signed_bad(void)
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{
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return test_self_signed(bad_f, 1, 0);
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}
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static int test_self_signed_error(void)
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{
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return test_self_signed("nonexistent file name", 1, -1);
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}
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static int test_store_ctx(void)
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{
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/* Verifying a cert where we have no trusted certs should fail */
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return test_self_signed(bad_f, 0, 0);
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}
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static int do_test_purpose(int purpose, int expected)
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{
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X509 *eecert = load_cert_from_file(ee_cert); /* may result in NULL */
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X509 *untrcert = load_cert_from_file(ca_cert);
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X509 *trcert = load_cert_from_file(sroot_cert);
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STACK_OF(X509) *trusted = sk_X509_new_null();
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STACK_OF(X509) *untrusted = sk_X509_new_null();
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X509_STORE_CTX *ctx = X509_STORE_CTX_new();
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int testresult = 0;
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if (!TEST_ptr(eecert)
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|| !TEST_ptr(untrcert)
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|| !TEST_ptr(trcert)
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|| !TEST_ptr(trusted)
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|| !TEST_ptr(untrusted)
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|| !TEST_ptr(ctx))
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goto err;
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if (!TEST_true(sk_X509_push(trusted, trcert)))
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goto err;
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trcert = NULL;
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if (!TEST_true(sk_X509_push(untrusted, untrcert)))
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goto err;
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untrcert = NULL;
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if (!TEST_true(X509_STORE_CTX_init(ctx, NULL, eecert, untrusted)))
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goto err;
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if (!TEST_true(X509_STORE_CTX_set_purpose(ctx, purpose)))
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goto err;
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/*
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* X509_STORE_CTX_set0_trusted_stack() is bady named. Despite the set0 name
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* we are still responsible for freeing trusted after we have finished with
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* it.
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*/
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X509_STORE_CTX_set0_trusted_stack(ctx, trusted);
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if (!TEST_int_eq(X509_verify_cert(ctx), expected))
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goto err;
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testresult = 1;
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err:
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OSSL_STACK_OF_X509_free(trusted);
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OSSL_STACK_OF_X509_free(untrusted);
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X509_STORE_CTX_free(ctx);
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X509_free(eecert);
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X509_free(untrcert);
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X509_free(trcert);
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return testresult;
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}
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static int test_purpose_ssl_client(void)
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{
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return do_test_purpose(X509_PURPOSE_SSL_CLIENT, 0);
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}
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static int test_purpose_ssl_server(void)
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{
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return do_test_purpose(X509_PURPOSE_SSL_SERVER, 1);
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}
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static int test_purpose_any(void)
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{
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return do_test_purpose(X509_PURPOSE_ANY, 1);
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}
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OPT_TEST_DECLARE_USAGE("certs-dir\n")
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int setup_tests(void)
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{
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if (!test_skip_common_options()) {
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TEST_error("Error parsing test options\n");
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return 0;
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}
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if (!TEST_ptr(certs_dir = test_get_argument(0)))
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return 0;
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if (!TEST_ptr(root_f = test_mk_file_path(certs_dir, "rootCA.pem"))
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|| !TEST_ptr(roots_f = test_mk_file_path(certs_dir, "roots.pem"))
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|| !TEST_ptr(untrusted_f = test_mk_file_path(certs_dir, "untrusted.pem"))
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|| !TEST_ptr(bad_f = test_mk_file_path(certs_dir, "bad.pem"))
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|| !TEST_ptr(req_f = test_mk_file_path(certs_dir, "sm2-csr.pem"))
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|| !TEST_ptr(sroot_cert = test_mk_file_path(certs_dir, "sroot-cert.pem"))
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|| !TEST_ptr(ca_cert = test_mk_file_path(certs_dir, "ca-cert.pem"))
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|| !TEST_ptr(ee_cert = test_mk_file_path(certs_dir, "ee-cert.pem")))
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goto err;
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ADD_TEST(test_alt_chains_cert_forgery);
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ADD_TEST(test_store_ctx);
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ADD_TEST(test_distinguishing_id);
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ADD_TEST(test_req_distinguishing_id);
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ADD_TEST(test_self_signed_good);
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ADD_TEST(test_self_signed_bad);
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ADD_TEST(test_self_signed_error);
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ADD_TEST(test_purpose_ssl_client);
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ADD_TEST(test_purpose_ssl_server);
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ADD_TEST(test_purpose_any);
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return 1;
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err:
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cleanup_tests();
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return 0;
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}
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void cleanup_tests(void)
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{
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OPENSSL_free(root_f);
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OPENSSL_free(roots_f);
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OPENSSL_free(untrusted_f);
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OPENSSL_free(bad_f);
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OPENSSL_free(req_f);
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OPENSSL_free(sroot_cert);
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OPENSSL_free(ca_cert);
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OPENSSL_free(ee_cert);
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}
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