mirror of
https://github.com/qemu/qemu.git
synced 2024-12-14 15:03:33 +08:00
b57482d7a0
It is very useful to know about TLS cert verification status when debugging, so add a trace point for it. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
595 lines
16 KiB
C
595 lines
16 KiB
C
/*
|
|
* QEMU crypto TLS session support
|
|
*
|
|
* 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 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/>.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "crypto/tlssession.h"
|
|
#include "crypto/tlscredsanon.h"
|
|
#include "crypto/tlscredsx509.h"
|
|
#include "qapi/error.h"
|
|
#include "qemu/acl.h"
|
|
#include "trace.h"
|
|
|
|
#ifdef CONFIG_GNUTLS
|
|
|
|
|
|
#include <gnutls/x509.h>
|
|
|
|
|
|
struct QCryptoTLSSession {
|
|
QCryptoTLSCreds *creds;
|
|
gnutls_session_t handle;
|
|
char *hostname;
|
|
char *aclname;
|
|
bool handshakeComplete;
|
|
QCryptoTLSSessionWriteFunc writeFunc;
|
|
QCryptoTLSSessionReadFunc readFunc;
|
|
void *opaque;
|
|
char *peername;
|
|
};
|
|
|
|
|
|
void
|
|
qcrypto_tls_session_free(QCryptoTLSSession *session)
|
|
{
|
|
if (!session) {
|
|
return;
|
|
}
|
|
|
|
gnutls_deinit(session->handle);
|
|
g_free(session->hostname);
|
|
g_free(session->peername);
|
|
g_free(session->aclname);
|
|
object_unref(OBJECT(session->creds));
|
|
g_free(session);
|
|
}
|
|
|
|
|
|
static ssize_t
|
|
qcrypto_tls_session_push(void *opaque, const void *buf, size_t len)
|
|
{
|
|
QCryptoTLSSession *session = opaque;
|
|
|
|
if (!session->writeFunc) {
|
|
errno = EIO;
|
|
return -1;
|
|
};
|
|
|
|
return session->writeFunc(buf, len, session->opaque);
|
|
}
|
|
|
|
|
|
static ssize_t
|
|
qcrypto_tls_session_pull(void *opaque, void *buf, size_t len)
|
|
{
|
|
QCryptoTLSSession *session = opaque;
|
|
|
|
if (!session->readFunc) {
|
|
errno = EIO;
|
|
return -1;
|
|
};
|
|
|
|
return session->readFunc(buf, len, session->opaque);
|
|
}
|
|
|
|
|
|
QCryptoTLSSession *
|
|
qcrypto_tls_session_new(QCryptoTLSCreds *creds,
|
|
const char *hostname,
|
|
const char *aclname,
|
|
QCryptoTLSCredsEndpoint endpoint,
|
|
Error **errp)
|
|
{
|
|
QCryptoTLSSession *session;
|
|
int ret;
|
|
|
|
session = g_new0(QCryptoTLSSession, 1);
|
|
trace_qcrypto_tls_session_new(
|
|
session, creds, hostname ? hostname : "<none>",
|
|
aclname ? aclname : "<none>", endpoint);
|
|
|
|
if (hostname) {
|
|
session->hostname = g_strdup(hostname);
|
|
}
|
|
if (aclname) {
|
|
session->aclname = g_strdup(aclname);
|
|
}
|
|
session->creds = creds;
|
|
object_ref(OBJECT(creds));
|
|
|
|
if (creds->endpoint != endpoint) {
|
|
error_setg(errp, "Credentials endpoint doesn't match session");
|
|
goto error;
|
|
}
|
|
|
|
if (endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
|
|
ret = gnutls_init(&session->handle, GNUTLS_SERVER);
|
|
} else {
|
|
ret = gnutls_init(&session->handle, GNUTLS_CLIENT);
|
|
}
|
|
if (ret < 0) {
|
|
error_setg(errp, "Cannot initialize TLS session: %s",
|
|
gnutls_strerror(ret));
|
|
goto error;
|
|
}
|
|
|
|
if (object_dynamic_cast(OBJECT(creds),
|
|
TYPE_QCRYPTO_TLS_CREDS_ANON)) {
|
|
QCryptoTLSCredsAnon *acreds = QCRYPTO_TLS_CREDS_ANON(creds);
|
|
char *prio;
|
|
|
|
if (creds->priority != NULL) {
|
|
prio = g_strdup_printf("%s:+ANON-DH", creds->priority);
|
|
} else {
|
|
prio = g_strdup(CONFIG_TLS_PRIORITY ":+ANON-DH");
|
|
}
|
|
|
|
ret = gnutls_priority_set_direct(session->handle, prio, NULL);
|
|
if (ret < 0) {
|
|
error_setg(errp, "Unable to set TLS session priority %s: %s",
|
|
prio, gnutls_strerror(ret));
|
|
g_free(prio);
|
|
goto error;
|
|
}
|
|
g_free(prio);
|
|
if (creds->endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
|
|
ret = gnutls_credentials_set(session->handle,
|
|
GNUTLS_CRD_ANON,
|
|
acreds->data.server);
|
|
} else {
|
|
ret = gnutls_credentials_set(session->handle,
|
|
GNUTLS_CRD_ANON,
|
|
acreds->data.client);
|
|
}
|
|
if (ret < 0) {
|
|
error_setg(errp, "Cannot set session credentials: %s",
|
|
gnutls_strerror(ret));
|
|
goto error;
|
|
}
|
|
} else if (object_dynamic_cast(OBJECT(creds),
|
|
TYPE_QCRYPTO_TLS_CREDS_X509)) {
|
|
QCryptoTLSCredsX509 *tcreds = QCRYPTO_TLS_CREDS_X509(creds);
|
|
const char *prio = creds->priority;
|
|
if (!prio) {
|
|
prio = CONFIG_TLS_PRIORITY;
|
|
}
|
|
|
|
ret = gnutls_priority_set_direct(session->handle, prio, NULL);
|
|
if (ret < 0) {
|
|
error_setg(errp, "Cannot set default TLS session priority %s: %s",
|
|
prio, gnutls_strerror(ret));
|
|
goto error;
|
|
}
|
|
ret = gnutls_credentials_set(session->handle,
|
|
GNUTLS_CRD_CERTIFICATE,
|
|
tcreds->data);
|
|
if (ret < 0) {
|
|
error_setg(errp, "Cannot set session credentials: %s",
|
|
gnutls_strerror(ret));
|
|
goto error;
|
|
}
|
|
|
|
if (creds->endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
|
|
/* This requests, but does not enforce a client cert.
|
|
* The cert checking code later does enforcement */
|
|
gnutls_certificate_server_set_request(session->handle,
|
|
GNUTLS_CERT_REQUEST);
|
|
}
|
|
} else {
|
|
error_setg(errp, "Unsupported TLS credentials type %s",
|
|
object_get_typename(OBJECT(creds)));
|
|
goto error;
|
|
}
|
|
|
|
gnutls_transport_set_ptr(session->handle, session);
|
|
gnutls_transport_set_push_function(session->handle,
|
|
qcrypto_tls_session_push);
|
|
gnutls_transport_set_pull_function(session->handle,
|
|
qcrypto_tls_session_pull);
|
|
|
|
return session;
|
|
|
|
error:
|
|
qcrypto_tls_session_free(session);
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
qcrypto_tls_session_check_certificate(QCryptoTLSSession *session,
|
|
Error **errp)
|
|
{
|
|
int ret;
|
|
unsigned int status;
|
|
const gnutls_datum_t *certs;
|
|
unsigned int nCerts, i;
|
|
time_t now;
|
|
gnutls_x509_crt_t cert = NULL;
|
|
|
|
now = time(NULL);
|
|
if (now == ((time_t)-1)) {
|
|
error_setg_errno(errp, errno, "Cannot get current time");
|
|
return -1;
|
|
}
|
|
|
|
ret = gnutls_certificate_verify_peers2(session->handle, &status);
|
|
if (ret < 0) {
|
|
error_setg(errp, "Verify failed: %s", gnutls_strerror(ret));
|
|
return -1;
|
|
}
|
|
|
|
if (status != 0) {
|
|
const char *reason = "Invalid certificate";
|
|
|
|
if (status & GNUTLS_CERT_INVALID) {
|
|
reason = "The certificate is not trusted";
|
|
}
|
|
|
|
if (status & GNUTLS_CERT_SIGNER_NOT_FOUND) {
|
|
reason = "The certificate hasn't got a known issuer";
|
|
}
|
|
|
|
if (status & GNUTLS_CERT_REVOKED) {
|
|
reason = "The certificate has been revoked";
|
|
}
|
|
|
|
if (status & GNUTLS_CERT_INSECURE_ALGORITHM) {
|
|
reason = "The certificate uses an insecure algorithm";
|
|
}
|
|
|
|
error_setg(errp, "%s", reason);
|
|
return -1;
|
|
}
|
|
|
|
certs = gnutls_certificate_get_peers(session->handle, &nCerts);
|
|
if (!certs) {
|
|
error_setg(errp, "No certificate peers");
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < nCerts; i++) {
|
|
ret = gnutls_x509_crt_init(&cert);
|
|
if (ret < 0) {
|
|
error_setg(errp, "Cannot initialize certificate: %s",
|
|
gnutls_strerror(ret));
|
|
return -1;
|
|
}
|
|
|
|
ret = gnutls_x509_crt_import(cert, &certs[i], GNUTLS_X509_FMT_DER);
|
|
if (ret < 0) {
|
|
error_setg(errp, "Cannot import certificate: %s",
|
|
gnutls_strerror(ret));
|
|
goto error;
|
|
}
|
|
|
|
if (gnutls_x509_crt_get_expiration_time(cert) < now) {
|
|
error_setg(errp, "The certificate has expired");
|
|
goto error;
|
|
}
|
|
|
|
if (gnutls_x509_crt_get_activation_time(cert) > now) {
|
|
error_setg(errp, "The certificate is not yet activated");
|
|
goto error;
|
|
}
|
|
|
|
if (gnutls_x509_crt_get_activation_time(cert) > now) {
|
|
error_setg(errp, "The certificate is not yet activated");
|
|
goto error;
|
|
}
|
|
|
|
if (i == 0) {
|
|
size_t dnameSize = 1024;
|
|
session->peername = g_malloc(dnameSize);
|
|
requery:
|
|
ret = gnutls_x509_crt_get_dn(cert, session->peername, &dnameSize);
|
|
if (ret < 0) {
|
|
if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER) {
|
|
session->peername = g_realloc(session->peername,
|
|
dnameSize);
|
|
goto requery;
|
|
}
|
|
error_setg(errp, "Cannot get client distinguished name: %s",
|
|
gnutls_strerror(ret));
|
|
goto error;
|
|
}
|
|
if (session->aclname) {
|
|
qemu_acl *acl = qemu_acl_find(session->aclname);
|
|
int allow;
|
|
if (!acl) {
|
|
error_setg(errp, "Cannot find ACL %s",
|
|
session->aclname);
|
|
goto error;
|
|
}
|
|
|
|
allow = qemu_acl_party_is_allowed(acl, session->peername);
|
|
|
|
if (!allow) {
|
|
error_setg(errp, "TLS x509 ACL check for %s is denied",
|
|
session->peername);
|
|
goto error;
|
|
}
|
|
}
|
|
if (session->hostname) {
|
|
if (!gnutls_x509_crt_check_hostname(cert, session->hostname)) {
|
|
error_setg(errp,
|
|
"Certificate does not match the hostname %s",
|
|
session->hostname);
|
|
goto error;
|
|
}
|
|
}
|
|
}
|
|
|
|
gnutls_x509_crt_deinit(cert);
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
gnutls_x509_crt_deinit(cert);
|
|
return -1;
|
|
}
|
|
|
|
|
|
int
|
|
qcrypto_tls_session_check_credentials(QCryptoTLSSession *session,
|
|
Error **errp)
|
|
{
|
|
if (object_dynamic_cast(OBJECT(session->creds),
|
|
TYPE_QCRYPTO_TLS_CREDS_ANON)) {
|
|
trace_qcrypto_tls_session_check_creds(session, "nop");
|
|
return 0;
|
|
} else if (object_dynamic_cast(OBJECT(session->creds),
|
|
TYPE_QCRYPTO_TLS_CREDS_X509)) {
|
|
if (session->creds->verifyPeer) {
|
|
int ret = qcrypto_tls_session_check_certificate(session,
|
|
errp);
|
|
trace_qcrypto_tls_session_check_creds(session,
|
|
ret == 0 ? "pass" : "fail");
|
|
return ret;
|
|
} else {
|
|
trace_qcrypto_tls_session_check_creds(session, "skip");
|
|
return 0;
|
|
}
|
|
} else {
|
|
trace_qcrypto_tls_session_check_creds(session, "error");
|
|
error_setg(errp, "Unexpected credential type %s",
|
|
object_get_typename(OBJECT(session->creds)));
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
qcrypto_tls_session_set_callbacks(QCryptoTLSSession *session,
|
|
QCryptoTLSSessionWriteFunc writeFunc,
|
|
QCryptoTLSSessionReadFunc readFunc,
|
|
void *opaque)
|
|
{
|
|
session->writeFunc = writeFunc;
|
|
session->readFunc = readFunc;
|
|
session->opaque = opaque;
|
|
}
|
|
|
|
|
|
ssize_t
|
|
qcrypto_tls_session_write(QCryptoTLSSession *session,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
ssize_t ret = gnutls_record_send(session->handle, buf, len);
|
|
|
|
if (ret < 0) {
|
|
switch (ret) {
|
|
case GNUTLS_E_AGAIN:
|
|
errno = EAGAIN;
|
|
break;
|
|
case GNUTLS_E_INTERRUPTED:
|
|
errno = EINTR;
|
|
break;
|
|
default:
|
|
errno = EIO;
|
|
break;
|
|
}
|
|
ret = -1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
ssize_t
|
|
qcrypto_tls_session_read(QCryptoTLSSession *session,
|
|
char *buf,
|
|
size_t len)
|
|
{
|
|
ssize_t ret = gnutls_record_recv(session->handle, buf, len);
|
|
|
|
if (ret < 0) {
|
|
switch (ret) {
|
|
case GNUTLS_E_AGAIN:
|
|
errno = EAGAIN;
|
|
break;
|
|
case GNUTLS_E_INTERRUPTED:
|
|
errno = EINTR;
|
|
break;
|
|
default:
|
|
errno = EIO;
|
|
break;
|
|
}
|
|
ret = -1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
int
|
|
qcrypto_tls_session_handshake(QCryptoTLSSession *session,
|
|
Error **errp)
|
|
{
|
|
int ret = gnutls_handshake(session->handle);
|
|
if (ret == 0) {
|
|
session->handshakeComplete = true;
|
|
} else {
|
|
if (ret == GNUTLS_E_INTERRUPTED ||
|
|
ret == GNUTLS_E_AGAIN) {
|
|
ret = 1;
|
|
} else {
|
|
error_setg(errp, "TLS handshake failed: %s",
|
|
gnutls_strerror(ret));
|
|
ret = -1;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
QCryptoTLSSessionHandshakeStatus
|
|
qcrypto_tls_session_get_handshake_status(QCryptoTLSSession *session)
|
|
{
|
|
if (session->handshakeComplete) {
|
|
return QCRYPTO_TLS_HANDSHAKE_COMPLETE;
|
|
} else if (gnutls_record_get_direction(session->handle) == 0) {
|
|
return QCRYPTO_TLS_HANDSHAKE_RECVING;
|
|
} else {
|
|
return QCRYPTO_TLS_HANDSHAKE_SENDING;
|
|
}
|
|
}
|
|
|
|
|
|
int
|
|
qcrypto_tls_session_get_key_size(QCryptoTLSSession *session,
|
|
Error **errp)
|
|
{
|
|
gnutls_cipher_algorithm_t cipher;
|
|
int ssf;
|
|
|
|
cipher = gnutls_cipher_get(session->handle);
|
|
ssf = gnutls_cipher_get_key_size(cipher);
|
|
if (!ssf) {
|
|
error_setg(errp, "Cannot get TLS cipher key size");
|
|
return -1;
|
|
}
|
|
return ssf;
|
|
}
|
|
|
|
|
|
char *
|
|
qcrypto_tls_session_get_peer_name(QCryptoTLSSession *session)
|
|
{
|
|
if (session->peername) {
|
|
return g_strdup(session->peername);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
#else /* ! CONFIG_GNUTLS */
|
|
|
|
|
|
QCryptoTLSSession *
|
|
qcrypto_tls_session_new(QCryptoTLSCreds *creds G_GNUC_UNUSED,
|
|
const char *hostname G_GNUC_UNUSED,
|
|
const char *aclname G_GNUC_UNUSED,
|
|
QCryptoTLSCredsEndpoint endpoint G_GNUC_UNUSED,
|
|
Error **errp)
|
|
{
|
|
error_setg(errp, "TLS requires GNUTLS support");
|
|
return NULL;
|
|
}
|
|
|
|
|
|
void
|
|
qcrypto_tls_session_free(QCryptoTLSSession *sess G_GNUC_UNUSED)
|
|
{
|
|
}
|
|
|
|
|
|
int
|
|
qcrypto_tls_session_check_credentials(QCryptoTLSSession *sess G_GNUC_UNUSED,
|
|
Error **errp)
|
|
{
|
|
error_setg(errp, "TLS requires GNUTLS support");
|
|
return -1;
|
|
}
|
|
|
|
|
|
void
|
|
qcrypto_tls_session_set_callbacks(
|
|
QCryptoTLSSession *sess G_GNUC_UNUSED,
|
|
QCryptoTLSSessionWriteFunc writeFunc G_GNUC_UNUSED,
|
|
QCryptoTLSSessionReadFunc readFunc G_GNUC_UNUSED,
|
|
void *opaque G_GNUC_UNUSED)
|
|
{
|
|
}
|
|
|
|
|
|
ssize_t
|
|
qcrypto_tls_session_write(QCryptoTLSSession *sess,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
errno = -EIO;
|
|
return -1;
|
|
}
|
|
|
|
|
|
ssize_t
|
|
qcrypto_tls_session_read(QCryptoTLSSession *sess,
|
|
char *buf,
|
|
size_t len)
|
|
{
|
|
errno = -EIO;
|
|
return -1;
|
|
}
|
|
|
|
|
|
int
|
|
qcrypto_tls_session_handshake(QCryptoTLSSession *sess,
|
|
Error **errp)
|
|
{
|
|
error_setg(errp, "TLS requires GNUTLS support");
|
|
return -1;
|
|
}
|
|
|
|
|
|
QCryptoTLSSessionHandshakeStatus
|
|
qcrypto_tls_session_get_handshake_status(QCryptoTLSSession *sess)
|
|
{
|
|
return QCRYPTO_TLS_HANDSHAKE_COMPLETE;
|
|
}
|
|
|
|
|
|
int
|
|
qcrypto_tls_session_get_key_size(QCryptoTLSSession *sess,
|
|
Error **errp)
|
|
{
|
|
error_setg(errp, "TLS requires GNUTLS support");
|
|
return -1;
|
|
}
|
|
|
|
|
|
char *
|
|
qcrypto_tls_session_get_peer_name(QCryptoTLSSession *sess)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
#endif
|