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libvirt/tests/virnettlshelpers.c

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/*
* Copyright (C) 2011-2012 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 <config.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/socket.h>
#include "virnettlshelpers.h"
#include "viralloc.h"
#include "virlog.h"
#include "virfile.h"
#include "virsocketaddr.h"
#if !defined WIN32 && HAVE_LIBTASN1_H && LIBGNUTLS_VERSION_NUMBER >= 0x020600
# define VIR_FROM_THIS VIR_FROM_RPC
VIR_LOG_INIT("tests.nettlshelpers");
/*
* These store some static data that is needed when
* encoding extensions in the x509 certs
*/
ASN1_TYPE pkix_asn1;
extern const ASN1_ARRAY_TYPE pkix_asn1_tab[];
/*
* 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 testTLSLoadKey(void)
{
gnutls_x509_privkey_t key;
const gnutls_datum_t data = { (unsigned char *)PRIVATE_KEY, strlen(PRIVATE_KEY) };
int err;
if ((err = gnutls_x509_privkey_init(&key)) < 0) {
VIR_WARN("Failed to init key %s", gnutls_strerror(err));
abort();
}
if ((err = gnutls_x509_privkey_import(key, &data,
GNUTLS_X509_FMT_PEM)) < 0) {
if (err != GNUTLS_E_BASE64_UNEXPECTED_HEADER_ERROR &&
err != GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
VIR_WARN("Failed to import key %s", gnutls_strerror(err));
abort();
}
if ((err = gnutls_x509_privkey_import_pkcs8(key, &data, GNUTLS_X509_FMT_PEM, NULL, 0)) < 0) {
VIR_WARN("Failed to import PKCS8 key %s", gnutls_strerror(err));
abort();
}
}
return key;
}
void testTLSInit(const char *keyfile)
{
gnutls_global_init();
if (asn1_array2tree(pkix_asn1_tab, &pkix_asn1, NULL) != ASN1_SUCCESS)
abort();
privkey = testTLSLoadKey();
if (virFileWriteStr(keyfile, PRIVATE_KEY, 0600) < 0)
abort();
}
void testTLSCleanup(const char *keyfile)
{
asn1_delete_structure(&pkix_asn1);
unlink(keyfile);
}
/*
* Turns an ASN1 object into a DER encoded byte array
*/
static void testTLSDerEncode(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);
if (VIR_ALLOC_N(data, size) < 0)
abort();
asn1_der_coding(src, src_name, data, &size, NULL);
res->data = (unsigned char *)data;
res->size = size;
}
/*
* 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 libvirt
* TLS certificate code
*/
void
testTLSGenerateCert(struct testTLSCertReq *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
*/
if ((err = gnutls_x509_crt_init(&crt)) < 0) {
VIR_WARN("Failed to initialize certificate %s", gnutls_strerror(err));
abort();
}
if ((err = gnutls_x509_crt_set_key(crt, privkey)) < 0) {
VIR_WARN("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) {
if ((err = gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_COUNTRY_NAME, 0,
req->country, strlen(req->country))) < 0) {
VIR_WARN("Failed to set certificate country name %s", gnutls_strerror(err));
abort();
}
}
if (req->cn) {
if ((err = gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_COMMON_NAME, 0,
req->cn, strlen(req->cn))) < 0) {
VIR_WARN("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) {
if ((err = gnutls_x509_crt_set_subject_alt_name(crt, GNUTLS_SAN_DNSNAME,
req->altname1,
strlen(req->altname1),
GNUTLS_FSAN_APPEND))) {
VIR_WARN("Failed to set certificate alt name %s", gnutls_strerror(err));
abort();
}
}
if (req->altname2) {
if ((err = gnutls_x509_crt_set_subject_alt_name(crt, GNUTLS_SAN_DNSNAME,
req->altname2,
strlen(req->altname2),
GNUTLS_FSAN_APPEND))) {
VIR_WARN("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) {
virSocketAddr addr;
char *data;
int len;
if (virSocketAddrParse(&addr, req->ipaddr1, 0) < 0) {
VIR_WARN("Cannot parse %s", req->ipaddr1);
abort();
}
if (addr.data.sa.sa_family == AF_INET) {
data = (char*)&addr.data.inet4.sin_addr;
len = 4;
} else {
data = (char*)&addr.data.inet6.sin6_addr;
len = 16;
}
if ((err = gnutls_x509_crt_set_subject_alt_name(crt, GNUTLS_SAN_IPADDRESS,
data, len, GNUTLS_FSAN_APPEND))) {
VIR_WARN("Failed to set certificate alt name %s", gnutls_strerror(err));
abort();
}
}
if (req->ipaddr2) {
virSocketAddr addr;
char *data;
int len;
if (virSocketAddrParse(&addr, req->ipaddr2, 0) < 0) {
VIR_WARN("Cannot parse %s", req->ipaddr2);
abort();
}
if (addr.data.sa.sa_family == AF_INET) {
data = (char*)&addr.data.inet4.sin_addr;
len = 4;
} else {
data = (char*)&addr.data.inet6.sin6_addr;
len = 16;
}
if ((err = gnutls_x509_crt_set_subject_alt_name(crt, GNUTLS_SAN_IPADDRESS,
data, len, GNUTLS_FSAN_APPEND))) {
VIR_WARN("Failed to set certificate alt name %s", gnutls_strerror(err));
abort();
}
}
/*
* 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);
testTLSDerEncode(ext, "", &der);
if ((err = gnutls_x509_crt_set_extension_by_oid(crt,
"2.5.29.19",
der.data,
der.size,
req->basicConstraintsCritical)) < 0) {
VIR_WARN("Failed to set certificate basic constraints %s", gnutls_strerror(err));
VIR_FREE(der.data);
abort();
}
asn1_delete_structure(&ext);
VIR_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);
testTLSDerEncode(ext, "", &der);
if ((err = gnutls_x509_crt_set_extension_by_oid(crt,
"2.5.29.15",
der.data,
der.size,
req->keyUsageCritical)) < 0) {
VIR_WARN("Failed to set certificate key usage %s", gnutls_strerror(err));
VIR_FREE(der.data);
abort();
}
asn1_delete_structure(&ext);
VIR_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);
}
testTLSDerEncode(ext, "", &der);
if ((err = gnutls_x509_crt_set_extension_by_oid(crt,
"2.5.29.37",
der.data,
der.size,
req->keyPurposeCritical)) < 0) {
VIR_WARN("Failed to set certificate key purpose %s", gnutls_strerror(err));
VIR_FREE(der.data);
abort();
}
asn1_delete_structure(&ext);
VIR_FREE(der.data);
}
/*
* Any old serial number will do, so lets pick 5
*/
if ((err = gnutls_x509_crt_set_serial(crt, serial, 5)) < 0) {
VIR_WARN("Failed to set certificate serial %s", gnutls_strerror(err));
abort();
}
if ((err = gnutls_x509_crt_set_activation_time(crt, start)) < 0) {
VIR_WARN("Failed to set certificate activation %s", gnutls_strerror(err));
abort();
}
if ((err = gnutls_x509_crt_set_expiration_time(crt, expire)) < 0) {
VIR_WARN("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
*/
if ((err = gnutls_x509_crt_sign2(crt, ca ? ca : crt, privkey, GNUTLS_DIG_SHA256, 0)) < 0) {
VIR_WARN("Failed to sign certificate %s", gnutls_strerror(err));
abort();
}
/*
* Finally write the new cert out to disk
*/
if ((err = gnutls_x509_crt_export(crt, GNUTLS_X509_FMT_PEM, buffer, &size)) < 0) {
VIR_WARN("Failed to export certificate %s", gnutls_strerror(err));
abort();
}
if (virFileWriteStr(req->filename, buffer, 0600) < 0) {
VIR_WARN("Failed to write certificate %s %s", req->filename, gnutls_strerror(err));
abort();
}
req->crt = crt;
return;
}
void testTLSWriteCertChain(const char *filename,
gnutls_x509_crt_t *certs,
size_t ncerts)
{
size_t i;
int fd;
int err;
static char buffer[1024*1024];
size_t size;
if ((fd = open(filename, O_WRONLY|O_CREAT, 0600)) < 0) {
VIR_WARN("Failed to open %s", filename);
abort();
}
for (i = 0; i < ncerts; i++) {
size = sizeof(buffer);
if ((err = gnutls_x509_crt_export(certs[i], GNUTLS_X509_FMT_PEM, buffer, &size)) < 0) {
VIR_WARN("Failed to export certificate %s", gnutls_strerror(err));
unlink(filename);
abort();
}
if (safewrite(fd, buffer, size) != size) {
VIR_WARN("Failed to write certificate to %s", filename);
unlink(filename);
abort();
}
}
VIR_FORCE_CLOSE(fd);
}
void testTLSDiscardCert(struct testTLSCertReq *req)
{
if (!req->crt)
return;
gnutls_x509_crt_deinit(req->crt);
req->crt = NULL;
if (getenv("VIRT_TEST_DEBUG_CERTS") == NULL)
unlink(req->filename);
}
#endif
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