308 lines
8.5 KiB
C
308 lines
8.5 KiB
C
/*
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* QEMU crypto TLS Pre-Shared Keys (PSK) support
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*
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* Copyright (c) 2018 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "qemu/osdep.h"
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#include "crypto/tlscredspsk.h"
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#include "tlscredspriv.h"
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#include "qapi/error.h"
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#include "qemu/module.h"
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#include "qom/object_interfaces.h"
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#include "trace.h"
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#ifdef CONFIG_GNUTLS
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#include <gnutls/gnutls.h>
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static int
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lookup_key(const char *pskfile, const char *username, gnutls_datum_t *key,
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Error **errp)
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{
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const size_t ulen = strlen(username);
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GError *gerr = NULL;
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char *content = NULL;
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char **lines = NULL;
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size_t clen = 0, i;
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int ret = -1;
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if (!g_file_get_contents(pskfile, &content, &clen, &gerr)) {
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error_setg(errp, "Cannot read PSK file %s: %s",
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pskfile, gerr->message);
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g_error_free(gerr);
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return -1;
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}
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lines = g_strsplit(content, "\n", -1);
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for (i = 0; lines[i] != NULL; ++i) {
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if (strncmp(lines[i], username, ulen) == 0 && lines[i][ulen] == ':') {
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key->data = (unsigned char *) g_strdup(&lines[i][ulen + 1]);
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key->size = strlen(lines[i]) - ulen - 1;
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ret = 0;
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goto out;
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}
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}
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error_setg(errp, "Username %s not found in PSK file %s",
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username, pskfile);
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out:
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free(content);
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g_strfreev(lines);
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return ret;
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}
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static int
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qcrypto_tls_creds_psk_load(QCryptoTLSCredsPSK *creds,
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Error **errp)
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{
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g_autofree char *pskfile = NULL;
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g_autofree char *dhparams = NULL;
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const char *username;
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int ret;
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int rv = -1;
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gnutls_datum_t key = { .data = NULL };
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trace_qcrypto_tls_creds_psk_load(creds,
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creds->parent_obj.dir ? creds->parent_obj.dir : "<nodir>");
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if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
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if (creds->username) {
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error_setg(errp, "username should not be set when endpoint=server");
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goto cleanup;
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}
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if (qcrypto_tls_creds_get_path(&creds->parent_obj,
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QCRYPTO_TLS_CREDS_DH_PARAMS,
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false, &dhparams, errp) < 0 ||
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qcrypto_tls_creds_get_path(&creds->parent_obj,
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QCRYPTO_TLS_CREDS_PSKFILE,
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true, &pskfile, errp) < 0) {
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goto cleanup;
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}
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ret = gnutls_psk_allocate_server_credentials(&creds->data.server);
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if (ret < 0) {
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error_setg(errp, "Cannot allocate credentials: %s",
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gnutls_strerror(ret));
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goto cleanup;
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}
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if (qcrypto_tls_creds_get_dh_params_file(&creds->parent_obj, dhparams,
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&creds->parent_obj.dh_params,
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errp) < 0) {
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goto cleanup;
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}
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gnutls_psk_set_server_credentials_file(creds->data.server, pskfile);
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gnutls_psk_set_server_dh_params(creds->data.server,
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creds->parent_obj.dh_params);
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} else {
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if (qcrypto_tls_creds_get_path(&creds->parent_obj,
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QCRYPTO_TLS_CREDS_PSKFILE,
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true, &pskfile, errp) < 0) {
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goto cleanup;
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}
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if (creds->username) {
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username = creds->username;
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} else {
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username = "qemu";
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}
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if (lookup_key(pskfile, username, &key, errp) != 0) {
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goto cleanup;
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}
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ret = gnutls_psk_allocate_client_credentials(&creds->data.client);
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if (ret < 0) {
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error_setg(errp, "Cannot allocate credentials: %s",
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gnutls_strerror(ret));
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goto cleanup;
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}
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gnutls_psk_set_client_credentials(creds->data.client,
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username, &key, GNUTLS_PSK_KEY_HEX);
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}
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rv = 0;
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cleanup:
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g_free(key.data);
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return rv;
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}
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static void
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qcrypto_tls_creds_psk_unload(QCryptoTLSCredsPSK *creds)
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{
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if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
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if (creds->data.client) {
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gnutls_psk_free_client_credentials(creds->data.client);
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creds->data.client = NULL;
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}
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} else {
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if (creds->data.server) {
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gnutls_psk_free_server_credentials(creds->data.server);
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creds->data.server = NULL;
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}
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}
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if (creds->parent_obj.dh_params) {
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gnutls_dh_params_deinit(creds->parent_obj.dh_params);
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creds->parent_obj.dh_params = NULL;
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}
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}
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#else /* ! CONFIG_GNUTLS */
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static void
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qcrypto_tls_creds_psk_load(QCryptoTLSCredsPSK *creds G_GNUC_UNUSED,
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Error **errp)
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{
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error_setg(errp, "TLS credentials support requires GNUTLS");
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}
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static void
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qcrypto_tls_creds_psk_unload(QCryptoTLSCredsPSK *creds G_GNUC_UNUSED)
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{
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/* nada */
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}
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#endif /* ! CONFIG_GNUTLS */
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static void
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qcrypto_tls_creds_psk_prop_set_loaded(Object *obj,
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bool value,
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Error **errp)
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{
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QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj);
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qcrypto_tls_creds_psk_unload(creds);
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if (value) {
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qcrypto_tls_creds_psk_load(creds, errp);
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}
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}
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#ifdef CONFIG_GNUTLS
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static bool
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qcrypto_tls_creds_psk_prop_get_loaded(Object *obj,
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Error **errp G_GNUC_UNUSED)
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{
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QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj);
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if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
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return creds->data.server != NULL;
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} else {
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return creds->data.client != NULL;
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}
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}
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#else /* ! CONFIG_GNUTLS */
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static bool
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qcrypto_tls_creds_psk_prop_get_loaded(Object *obj G_GNUC_UNUSED,
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Error **errp G_GNUC_UNUSED)
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{
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return false;
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}
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#endif /* ! CONFIG_GNUTLS */
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static void
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qcrypto_tls_creds_psk_complete(UserCreatable *uc, Error **errp)
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{
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object_property_set_bool(OBJECT(uc), "loaded", true, errp);
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}
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static void
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qcrypto_tls_creds_psk_finalize(Object *obj)
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{
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QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj);
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qcrypto_tls_creds_psk_unload(creds);
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}
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static void
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qcrypto_tls_creds_psk_prop_set_username(Object *obj,
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const char *value,
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Error **errp G_GNUC_UNUSED)
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{
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QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj);
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creds->username = g_strdup(value);
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}
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static char *
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qcrypto_tls_creds_psk_prop_get_username(Object *obj,
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Error **errp G_GNUC_UNUSED)
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{
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QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj);
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return g_strdup(creds->username);
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}
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static void
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qcrypto_tls_creds_psk_class_init(ObjectClass *oc, void *data)
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{
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UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
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ucc->complete = qcrypto_tls_creds_psk_complete;
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object_class_property_add_bool(oc, "loaded",
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qcrypto_tls_creds_psk_prop_get_loaded,
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qcrypto_tls_creds_psk_prop_set_loaded);
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object_class_property_add_str(oc, "username",
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qcrypto_tls_creds_psk_prop_get_username,
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qcrypto_tls_creds_psk_prop_set_username);
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}
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static const TypeInfo qcrypto_tls_creds_psk_info = {
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.parent = TYPE_QCRYPTO_TLS_CREDS,
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.name = TYPE_QCRYPTO_TLS_CREDS_PSK,
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.instance_size = sizeof(QCryptoTLSCredsPSK),
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.instance_finalize = qcrypto_tls_creds_psk_finalize,
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.class_size = sizeof(QCryptoTLSCredsPSKClass),
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.class_init = qcrypto_tls_creds_psk_class_init,
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.interfaces = (InterfaceInfo[]) {
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{ TYPE_USER_CREATABLE },
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{ }
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}
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};
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static void
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qcrypto_tls_creds_psk_register_types(void)
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{
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type_register_static(&qcrypto_tls_creds_psk_info);
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}
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type_init(qcrypto_tls_creds_psk_register_types);
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