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qemu/tests/crypto-tls-x509-helpers.c

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/*
* Copyright (C) 2015 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
* Author: Daniel P. Berrange <berrange@redhat.com>
*/
#include <stdlib.h>
#include <fcntl.h>
#include "config-host.h"
#include "crypto-tls-x509-helpers.h"
#include "qemu/sockets.h"
#ifdef QCRYPTO_HAVE_TLS_TEST_SUPPORT
/*
* This stores some static data that is needed when
* encoding extensions in the x509 certs
*/
ASN1_TYPE pkix_asn1;
/*
* To avoid consuming random entropy to generate keys,
* here's one we prepared earlier :-)
*/
gnutls_x509_privkey_t privkey;
# define PRIVATE_KEY \
"-----BEGIN PRIVATE KEY-----\n" \
"MIICdQIBADANBgkqhkiG9w0BAQEFAASCAl8wggJbAgEAAoGBALVcr\n" \
"BL40Tm6yq88FBhJNw1aaoCjmtg0l4dWQZ/e9Fimx4ARxFpT+ji4FE\n" \
"Cgl9s/SGqC+1nvlkm9ViSo0j7MKDbnDB+VRHDvMAzQhA2X7e8M0n9\n" \
"rPolUY2lIVC83q0BBaOBkCj2RSmT2xTEbbC2xLukSrg2WP/ihVOxc\n" \
"kXRuyFtzAgMBAAECgYB7slBexDwXrtItAMIH6m/U+LUpNe0Xx48OL\n" \
"IOn4a4whNgO/o84uIwygUK27ZGFZT0kAGAk8CdF9hA6ArcbQ62s1H\n" \
"myxrUbF9/mrLsQw1NEqpuUk9Ay2Tx5U/wPx35S3W/X2AvR/ZpTnCn\n" \
"2q/7ym9fyiSoj86drD7BTvmKXlOnOwQJBAPOFMp4mMa9NGpGuEssO\n" \
"m3Uwbp6lhcP0cA9MK+iOmeANpoKWfBdk5O34VbmeXnGYWEkrnX+9J\n" \
"bM4wVhnnBWtgBMCQQC+qAEmvwcfhauERKYznMVUVksyeuhxhCe7EK\n" \
"mPh+U2+g0WwdKvGDgO0PPt1gq0ILEjspMDeMHVdTwkaVBo/uMhAkA\n" \
"Z5SsZyCP2aTOPFDypXRdI4eqRcjaEPOUBq27r3uYb/jeboVb2weLa\n" \
"L1MmVuHiIHoa5clswPdWVI2y0em2IGoDAkBPSp/v9VKJEZabk9Frd\n" \
"a+7u4fanrM9QrEjY3KhduslSilXZZSxrWjjAJPyPiqFb3M8XXA26W\n" \
"nz1KYGnqYKhLcBAkB7dt57n9xfrhDpuyVEv+Uv1D3VVAhZlsaZ5Pp\n" \
"dcrhrkJn2sa/+O8OKvdrPSeeu/N5WwYhJf61+CPoenMp7IFci\n" \
"-----END PRIVATE KEY-----\n"
/*
* This loads the private key we defined earlier
*/
static gnutls_x509_privkey_t test_tls_load_key(void)
{
gnutls_x509_privkey_t key;
const gnutls_datum_t data = { (unsigned char *)PRIVATE_KEY,
strlen(PRIVATE_KEY) };
int err;
err = gnutls_x509_privkey_init(&key);
if (err < 0) {
g_critical("Failed to init key %s", gnutls_strerror(err));
abort();
}
err = gnutls_x509_privkey_import(key, &data,
GNUTLS_X509_FMT_PEM);
if (err < 0) {
if (err != GNUTLS_E_BASE64_UNEXPECTED_HEADER_ERROR &&
err != GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
g_critical("Failed to import key %s", gnutls_strerror(err));
abort();
}
err = gnutls_x509_privkey_import_pkcs8(
key, &data, GNUTLS_X509_FMT_PEM, NULL, 0);
if (err < 0) {
g_critical("Failed to import PKCS8 key %s", gnutls_strerror(err));
abort();
}
}
return key;
}
void test_tls_init(const char *keyfile)
{
gnutls_global_init();
if (asn1_array2tree(pkix_asn1_tab, &pkix_asn1, NULL) != ASN1_SUCCESS) {
abort();
}
privkey = test_tls_load_key();
if (!g_file_set_contents(keyfile, PRIVATE_KEY, -1, NULL)) {
abort();
}
}
void test_tls_cleanup(const char *keyfile)
{
asn1_delete_structure(&pkix_asn1);
unlink(keyfile);
}
/*
* Turns an ASN1 object into a DER encoded byte array
*/
static void test_tls_der_encode(ASN1_TYPE src,
const char *src_name,
gnutls_datum_t *res)
{
int size;
char *data = NULL;
size = 0;
asn1_der_coding(src, src_name, NULL, &size, NULL);
data = g_new0(char, size);
asn1_der_coding(src, src_name, data, &size, NULL);
res->data = (unsigned char *)data;
res->size = size;
}
static void
test_tls_get_ipaddr(const char *addrstr,
char **data,
int *datalen)
{
struct addrinfo *res;
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_NUMERICHOST;
g_assert(getaddrinfo(addrstr, NULL, &hints, &res) == 0);
*datalen = res->ai_addrlen;
*data = g_new(char, *datalen);
memcpy(*data, res->ai_addr, *datalen);
}
/*
* This is a fairly lame x509 certificate generator.
*
* Do not copy/use this code for generating real certificates
* since it leaves out many things that you would want in
* certificates for real world usage.
*
* This is good enough only for doing tests of the QEMU
* TLS certificate code
*/
void
test_tls_generate_cert(QCryptoTLSTestCertReq *req,
gnutls_x509_crt_t ca)
{
gnutls_x509_crt_t crt;
int err;
static char buffer[1024 * 1024];
size_t size = sizeof(buffer);
char serial[5] = { 1, 2, 3, 4, 0 };
gnutls_datum_t der;
time_t start = time(NULL) + (60 * 60 * req->start_offset);
time_t expire = time(NULL) + (60 * 60 * (req->expire_offset
? req->expire_offset : 24));
/*
* Prepare our new certificate object
*/
err = gnutls_x509_crt_init(&crt);
if (err < 0) {
g_critical("Failed to initialize certificate %s", gnutls_strerror(err));
abort();
}
err = gnutls_x509_crt_set_key(crt, privkey);
if (err < 0) {
g_critical("Failed to set certificate key %s", gnutls_strerror(err));
abort();
}
/*
* A v3 certificate is required in order to be able
* set any of the basic constraints, key purpose and
* key usage data
*/
gnutls_x509_crt_set_version(crt, 3);
if (req->country) {
err = gnutls_x509_crt_set_dn_by_oid(
crt, GNUTLS_OID_X520_COUNTRY_NAME, 0,
req->country, strlen(req->country));
if (err < 0) {
g_critical("Failed to set certificate country name %s",
gnutls_strerror(err));
abort();
}
}
if (req->cn) {
err = gnutls_x509_crt_set_dn_by_oid(
crt, GNUTLS_OID_X520_COMMON_NAME, 0,
req->cn, strlen(req->cn));
if (err < 0) {
g_critical("Failed to set certificate common name %s",
gnutls_strerror(err));
abort();
}
}
/*
* Setup the subject altnames, which are used
* for hostname checks in live sessions
*/
if (req->altname1) {
err = gnutls_x509_crt_set_subject_alt_name(
crt, GNUTLS_SAN_DNSNAME,
req->altname1,
strlen(req->altname1),
GNUTLS_FSAN_APPEND);
if (err < 0) {
g_critical("Failed to set certificate alt name %s",
gnutls_strerror(err));
abort();
}
}
if (req->altname2) {
err = gnutls_x509_crt_set_subject_alt_name(
crt, GNUTLS_SAN_DNSNAME,
req->altname2,
strlen(req->altname2),
GNUTLS_FSAN_APPEND);
if (err < 0) {
g_critical("Failed to set certificate %s alt name",
gnutls_strerror(err));
abort();
}
}
/*
* IP address need to be put into the cert in their
* raw byte form, not strings, hence this is a little
* more complicated
*/
if (req->ipaddr1) {
char *data;
int len;
test_tls_get_ipaddr(req->ipaddr1, &data, &len);
err = gnutls_x509_crt_set_subject_alt_name(
crt, GNUTLS_SAN_IPADDRESS,
data, len, GNUTLS_FSAN_APPEND);
if (err < 0) {
g_critical("Failed to set certificate alt name %s",
gnutls_strerror(err));
abort();
}
g_free(data);
}
if (req->ipaddr2) {
char *data;
int len;
test_tls_get_ipaddr(req->ipaddr2, &data, &len);
err = gnutls_x509_crt_set_subject_alt_name(
crt, GNUTLS_SAN_IPADDRESS,
data, len, GNUTLS_FSAN_APPEND);
if (err < 0) {
g_critical("Failed to set certificate alt name %s",
gnutls_strerror(err));
abort();
}
g_free(data);
}
/*
* Basic constraints are used to decide if the cert
* is for a CA or not. We can't use the convenient
* gnutls API for setting this, since it hardcodes
* the 'critical' field which we want control over
*/
if (req->basicConstraintsEnable) {
ASN1_TYPE ext = ASN1_TYPE_EMPTY;
asn1_create_element(pkix_asn1, "PKIX1.BasicConstraints", &ext);
asn1_write_value(ext, "cA",
req->basicConstraintsIsCA ? "TRUE" : "FALSE", 1);
asn1_write_value(ext, "pathLenConstraint", NULL, 0);
test_tls_der_encode(ext, "", &der);
err = gnutls_x509_crt_set_extension_by_oid(
crt, "2.5.29.19",
der.data, der.size,
req->basicConstraintsCritical);
if (err < 0) {
g_critical("Failed to set certificate basic constraints %s",
gnutls_strerror(err));
g_free(der.data);
abort();
}
asn1_delete_structure(&ext);
g_free(der.data);
}
/*
* Next up the key usage extension. Again we can't
* use the gnutls API since it hardcodes the extension
* to be 'critical'
*/
if (req->keyUsageEnable) {
ASN1_TYPE ext = ASN1_TYPE_EMPTY;
char str[2];
str[0] = req->keyUsageValue & 0xff;
str[1] = (req->keyUsageValue >> 8) & 0xff;
asn1_create_element(pkix_asn1, "PKIX1.KeyUsage", &ext);
asn1_write_value(ext, "", str, 9);
test_tls_der_encode(ext, "", &der);
err = gnutls_x509_crt_set_extension_by_oid(
crt, "2.5.29.15",
der.data, der.size,
req->keyUsageCritical);
if (err < 0) {
g_critical("Failed to set certificate key usage %s",
gnutls_strerror(err));
g_free(der.data);
abort();
}
asn1_delete_structure(&ext);
g_free(der.data);
}
/*
* Finally the key purpose extension. This time
* gnutls has the opposite problem, always hardcoding
* it to be non-critical. So once again we have to
* set this the hard way building up ASN1 data ourselves
*/
if (req->keyPurposeEnable) {
ASN1_TYPE ext = ASN1_TYPE_EMPTY;
asn1_create_element(pkix_asn1, "PKIX1.ExtKeyUsageSyntax", &ext);
if (req->keyPurposeOID1) {
asn1_write_value(ext, "", "NEW", 1);
asn1_write_value(ext, "?LAST", req->keyPurposeOID1, 1);
}
if (req->keyPurposeOID2) {
asn1_write_value(ext, "", "NEW", 1);
asn1_write_value(ext, "?LAST", req->keyPurposeOID2, 1);
}
test_tls_der_encode(ext, "", &der);
err = gnutls_x509_crt_set_extension_by_oid(
crt, "2.5.29.37",
der.data, der.size,
req->keyPurposeCritical);
if (err < 0) {
g_critical("Failed to set certificate key purpose %s",
gnutls_strerror(err));
g_free(der.data);
abort();
}
asn1_delete_structure(&ext);
g_free(der.data);
}
/*
* Any old serial number will do, so lets pick 5
*/
err = gnutls_x509_crt_set_serial(crt, serial, 5);
if (err < 0) {
g_critical("Failed to set certificate serial %s",
gnutls_strerror(err));
abort();
}
err = gnutls_x509_crt_set_activation_time(crt, start);
if (err < 0) {
g_critical("Failed to set certificate activation %s",
gnutls_strerror(err));
abort();
}
err = gnutls_x509_crt_set_expiration_time(crt, expire);
if (err < 0) {
g_critical("Failed to set certificate expiration %s",
gnutls_strerror(err));
abort();
}
/*
* If no 'ca' is set then we are self signing
* the cert. This is done for the root CA certs
*/
err = gnutls_x509_crt_sign(crt, ca ? ca : crt, privkey);
if (err < 0) {
g_critical("Failed to sign certificate %s",
gnutls_strerror(err));
abort();
}
/*
* Finally write the new cert out to disk
*/
err = gnutls_x509_crt_export(
crt, GNUTLS_X509_FMT_PEM, buffer, &size);
if (err < 0) {
g_critical("Failed to export certificate %s: %d",
gnutls_strerror(err), err);
abort();
}
if (!g_file_set_contents(req->filename, buffer, -1, NULL)) {
g_critical("Failed to write certificate %s",
req->filename);
abort();
}
req->crt = crt;
}
void test_tls_write_cert_chain(const char *filename,
gnutls_x509_crt_t *certs,
size_t ncerts)
{
size_t i;
size_t capacity = 1024, offset = 0;
char *buffer = g_new0(char, capacity);
int err;
for (i = 0; i < ncerts; i++) {
size_t len = capacity - offset;
retry:
err = gnutls_x509_crt_export(certs[i], GNUTLS_X509_FMT_PEM,
buffer + offset, &len);
if (err < 0) {
if (err == GNUTLS_E_SHORT_MEMORY_BUFFER) {
buffer = g_renew(char, buffer, offset + len);
capacity = offset + len;
goto retry;
}
g_critical("Failed to export certificate chain %s: %d",
gnutls_strerror(err), err);
abort();
}
offset += len;
}
if (!g_file_set_contents(filename, buffer, offset, NULL)) {
abort();
}
}
void test_tls_discard_cert(QCryptoTLSTestCertReq *req)
{
if (!req->crt) {
return;
}
gnutls_x509_crt_deinit(req->crt);
req->crt = NULL;
if (getenv("QEMU_TEST_DEBUG_CERTS") == NULL) {
unlink(req->filename);
}
}
#endif /* QCRYPTO_HAVE_TLS_TEST_SUPPORT */
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