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xemu/crypto/tlscredsx509.c
Markus Armbruster d2623129a7 qom: Drop parameter @errp of object_property_add() & friends 
The only way object_property_add() can fail is when a property with
the same name already exists.  Since our property names are all
hardcoded, failure is a programming error, and the appropriate way to
handle it is passing &error_abort.

Same for its variants, except for object_property_add_child(), which
additionally fails when the child already has a parent.  Parentage is
also under program control, so this is a programming error, too.

We have a bit over 500 callers.  Almost half of them pass
&error_abort, slightly fewer ignore errors, one test case handles
errors, and the remaining few callers pass them to their own callers.

The previous few commits demonstrated once again that ignoring
programming errors is a bad idea.

Of the few ones that pass on errors, several violate the Error API.
The Error ** argument must be NULL, &error_abort, &error_fatal, or a
pointer to a variable containing NULL.  Passing an argument of the
latter kind twice without clearing it in between is wrong: if the
first call sets an error, it no longer points to NULL for the second
call.  ich9_pm_add_properties(), sparc32_ledma_realize(),
sparc32_dma_realize(), xilinx_axidma_realize(), xilinx_enet_realize()
are wrong that way.

When the one appropriate choice of argument is &error_abort, letting
users pick the argument is a bad idea.

Drop parameter @errp and assert the preconditions instead.

There's one exception to "duplicate property name is a programming
error": the way object_property_add() implements the magic (and
undocumented) "automatic arrayification".  Don't drop @errp there.
Instead, rename object_property_add() to object_property_try_add(),
and add the obvious wrapper object_property_add().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200505152926.18877-15-armbru@redhat.com>
[Two semantic rebase conflicts resolved]
2020-05-15 07:07:58 +02:00

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/*
* QEMU crypto TLS x509 credential 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 2.1 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/>.
*
*/
#include "qemu/osdep.h"
#include "crypto/tlscredsx509.h"
#include "tlscredspriv.h"
#include "crypto/secret.h"
#include "qapi/error.h"
#include "qemu/module.h"
#include "qom/object_interfaces.h"
#include "trace.h"
#ifdef CONFIG_GNUTLS
#include <gnutls/x509.h>
static int
qcrypto_tls_creds_check_cert_times(gnutls_x509_crt_t cert,
const char *certFile,
bool isServer,
bool isCA,
Error **errp)
{
time_t now = time(NULL);
if (now == ((time_t)-1)) {
error_setg_errno(errp, errno, "cannot get current time");
return -1;
}
if (gnutls_x509_crt_get_expiration_time(cert) < now) {
error_setg(errp,
(isCA ?
"The CA certificate %s has expired" :
(isServer ?
"The server certificate %s has expired" :
"The client certificate %s has expired")),
certFile);
return -1;
}
if (gnutls_x509_crt_get_activation_time(cert) > now) {
error_setg(errp,
(isCA ?
"The CA certificate %s is not yet active" :
(isServer ?
"The server certificate %s is not yet active" :
"The client certificate %s is not yet active")),
certFile);
return -1;
}
return 0;
}
static int
qcrypto_tls_creds_check_cert_basic_constraints(QCryptoTLSCredsX509 *creds,
gnutls_x509_crt_t cert,
const char *certFile,
bool isServer,
bool isCA,
Error **errp)
{
int status;
status = gnutls_x509_crt_get_basic_constraints(cert, NULL, NULL, NULL);
trace_qcrypto_tls_creds_x509_check_basic_constraints(
creds, certFile, status);
if (status > 0) { /* It is a CA cert */
if (!isCA) {
error_setg(errp, isServer ?
"The certificate %s basic constraints show a CA, "
"but we need one for a server" :
"The certificate %s basic constraints show a CA, "
"but we need one for a client",
certFile);
return -1;
}
} else if (status == 0) { /* It is not a CA cert */
if (isCA) {
error_setg(errp,
"The certificate %s basic constraints do not "
"show a CA",
certFile);
return -1;
}
} else if (status == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
/* Missing basicConstraints */
if (isCA) {
error_setg(errp,
"The certificate %s is missing basic constraints "
"for a CA",
certFile);
return -1;
}
} else { /* General error */
error_setg(errp,
"Unable to query certificate %s basic constraints: %s",
certFile, gnutls_strerror(status));
return -1;
}
return 0;
}
static int
qcrypto_tls_creds_check_cert_key_usage(QCryptoTLSCredsX509 *creds,
gnutls_x509_crt_t cert,
const char *certFile,
bool isCA,
Error **errp)
{
int status;
unsigned int usage = 0;
unsigned int critical = 0;
status = gnutls_x509_crt_get_key_usage(cert, &usage, &critical);
trace_qcrypto_tls_creds_x509_check_key_usage(
creds, certFile, status, usage, critical);
if (status < 0) {
if (status == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
usage = isCA ? GNUTLS_KEY_KEY_CERT_SIGN :
GNUTLS_KEY_DIGITAL_SIGNATURE|GNUTLS_KEY_KEY_ENCIPHERMENT;
} else {
error_setg(errp,
"Unable to query certificate %s key usage: %s",
certFile, gnutls_strerror(status));
return -1;
}
}
if (isCA) {
if (!(usage & GNUTLS_KEY_KEY_CERT_SIGN)) {
if (critical) {
error_setg(errp,
"Certificate %s usage does not permit "
"certificate signing", certFile);
return -1;
}
}
} else {
if (!(usage & GNUTLS_KEY_DIGITAL_SIGNATURE)) {
if (critical) {
error_setg(errp,
"Certificate %s usage does not permit digital "
"signature", certFile);
return -1;
}
}
if (!(usage & GNUTLS_KEY_KEY_ENCIPHERMENT)) {
if (critical) {
error_setg(errp,
"Certificate %s usage does not permit key "
"encipherment", certFile);
return -1;
}
}
}
return 0;
}
static int
qcrypto_tls_creds_check_cert_key_purpose(QCryptoTLSCredsX509 *creds,
gnutls_x509_crt_t cert,
const char *certFile,
bool isServer,
Error **errp)
{
int status;
size_t i;
unsigned int purposeCritical;
unsigned int critical;
char *buffer = NULL;
size_t size;
bool allowClient = false, allowServer = false;
critical = 0;
for (i = 0; ; i++) {
size = 0;
status = gnutls_x509_crt_get_key_purpose_oid(cert, i, buffer,
&size, NULL);
if (status == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
/* If there is no data at all, then we must allow
client/server to pass */
if (i == 0) {
allowServer = allowClient = true;
}
break;
}
if (status != GNUTLS_E_SHORT_MEMORY_BUFFER) {
error_setg(errp,
"Unable to query certificate %s key purpose: %s",
certFile, gnutls_strerror(status));
return -1;
}
buffer = g_new0(char, size);
status = gnutls_x509_crt_get_key_purpose_oid(cert, i, buffer,
&size, &purposeCritical);
if (status < 0) {
trace_qcrypto_tls_creds_x509_check_key_purpose(
creds, certFile, status, "<none>", purposeCritical);
g_free(buffer);
error_setg(errp,
"Unable to query certificate %s key purpose: %s",
certFile, gnutls_strerror(status));
return -1;
}
trace_qcrypto_tls_creds_x509_check_key_purpose(
creds, certFile, status, buffer, purposeCritical);
if (purposeCritical) {
critical = true;
}
if (g_str_equal(buffer, GNUTLS_KP_TLS_WWW_SERVER)) {
allowServer = true;
} else if (g_str_equal(buffer, GNUTLS_KP_TLS_WWW_CLIENT)) {
allowClient = true;
} else if (g_str_equal(buffer, GNUTLS_KP_ANY)) {
allowServer = allowClient = true;
}
g_free(buffer);
buffer = NULL;
}
if (isServer) {
if (!allowServer) {
if (critical) {
error_setg(errp,
"Certificate %s purpose does not allow "
"use with a TLS server", certFile);
return -1;
}
}
} else {
if (!allowClient) {
if (critical) {
error_setg(errp,
"Certificate %s purpose does not allow use "
"with a TLS client", certFile);
return -1;
}
}
}
return 0;
}
static int
qcrypto_tls_creds_check_cert(QCryptoTLSCredsX509 *creds,
gnutls_x509_crt_t cert,
const char *certFile,
bool isServer,
bool isCA,
Error **errp)
{
if (qcrypto_tls_creds_check_cert_times(cert, certFile,
isServer, isCA,
errp) < 0) {
return -1;
}
if (qcrypto_tls_creds_check_cert_basic_constraints(creds,
cert, certFile,
isServer, isCA,
errp) < 0) {
return -1;
}
if (qcrypto_tls_creds_check_cert_key_usage(creds,
cert, certFile,
isCA, errp) < 0) {
return -1;
}
if (!isCA &&
qcrypto_tls_creds_check_cert_key_purpose(creds,
cert, certFile,
isServer, errp) < 0) {
return -1;
}
return 0;
}
static int
qcrypto_tls_creds_check_cert_pair(gnutls_x509_crt_t cert,
const char *certFile,
gnutls_x509_crt_t *cacerts,
size_t ncacerts,
const char *cacertFile,
bool isServer,
Error **errp)
{
unsigned int status;
if (gnutls_x509_crt_list_verify(&cert, 1,
cacerts, ncacerts,
NULL, 0,
0, &status) < 0) {
error_setg(errp, isServer ?
"Unable to verify server certificate %s against "
"CA certificate %s" :
"Unable to verify client certificate %s against "
"CA certificate %s",
certFile, cacertFile);
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";
}
#ifndef GNUTLS_1_0_COMPAT
if (status & GNUTLS_CERT_INSECURE_ALGORITHM) {
reason = "The certificate uses an insecure algorithm";
}
#endif
error_setg(errp,
"Our own certificate %s failed validation against %s: %s",
certFile, cacertFile, reason);
return -1;
}
return 0;
}
static gnutls_x509_crt_t
qcrypto_tls_creds_load_cert(QCryptoTLSCredsX509 *creds,
const char *certFile,
bool isServer,
Error **errp)
{
gnutls_datum_t data;
gnutls_x509_crt_t cert = NULL;
g_autofree char *buf = NULL;
gsize buflen;
GError *gerr = NULL;
int ret = -1;
int err;
trace_qcrypto_tls_creds_x509_load_cert(creds, isServer, certFile);
err = gnutls_x509_crt_init(&cert);
if (err < 0) {
error_setg(errp, "Unable to initialize certificate: %s",
gnutls_strerror(err));
goto cleanup;
}
if (!g_file_get_contents(certFile, &buf, &buflen, &gerr)) {
error_setg(errp, "Cannot load CA cert list %s: %s",
certFile, gerr->message);
g_error_free(gerr);
goto cleanup;
}
data.data = (unsigned char *)buf;
data.size = strlen(buf);
err = gnutls_x509_crt_import(cert, &data, GNUTLS_X509_FMT_PEM);
if (err < 0) {
error_setg(errp, isServer ?
"Unable to import server certificate %s: %s" :
"Unable to import client certificate %s: %s",
certFile,
gnutls_strerror(err));
goto cleanup;
}
ret = 0;
cleanup:
if (ret != 0) {
gnutls_x509_crt_deinit(cert);
cert = NULL;
}
return cert;
}
static int
qcrypto_tls_creds_load_ca_cert_list(QCryptoTLSCredsX509 *creds,
const char *certFile,
gnutls_x509_crt_t *certs,
unsigned int certMax,
size_t *ncerts,
Error **errp)
{
gnutls_datum_t data;
g_autofree char *buf = NULL;
gsize buflen;
GError *gerr = NULL;
*ncerts = 0;
trace_qcrypto_tls_creds_x509_load_cert_list(creds, certFile);
if (!g_file_get_contents(certFile, &buf, &buflen, &gerr)) {
error_setg(errp, "Cannot load CA cert list %s: %s",
certFile, gerr->message);
g_error_free(gerr);
return -1;
}
data.data = (unsigned char *)buf;
data.size = strlen(buf);
if (gnutls_x509_crt_list_import(certs, &certMax, &data,
GNUTLS_X509_FMT_PEM, 0) < 0) {
error_setg(errp,
"Unable to import CA certificate list %s",
certFile);
return -1;
}
*ncerts = certMax;
return 0;
}
#define MAX_CERTS 16
static int
qcrypto_tls_creds_x509_sanity_check(QCryptoTLSCredsX509 *creds,
bool isServer,
const char *cacertFile,
const char *certFile,
Error **errp)
{
gnutls_x509_crt_t cert = NULL;
gnutls_x509_crt_t cacerts[MAX_CERTS];
size_t ncacerts = 0;
size_t i;
int ret = -1;
memset(cacerts, 0, sizeof(cacerts));
if (certFile &&
access(certFile, R_OK) == 0) {
cert = qcrypto_tls_creds_load_cert(creds,
certFile, isServer,
errp);
if (!cert) {
goto cleanup;
}
}
if (access(cacertFile, R_OK) == 0) {
if (qcrypto_tls_creds_load_ca_cert_list(creds,
cacertFile, cacerts,
MAX_CERTS, &ncacerts,
errp) < 0) {
goto cleanup;
}
}
if (cert &&
qcrypto_tls_creds_check_cert(creds,
cert, certFile, isServer,
false, errp) < 0) {
goto cleanup;
}
for (i = 0; i < ncacerts; i++) {
if (qcrypto_tls_creds_check_cert(creds,
cacerts[i], cacertFile,
isServer, true, errp) < 0) {
goto cleanup;
}
}
if (cert && ncacerts &&
qcrypto_tls_creds_check_cert_pair(cert, certFile, cacerts,
ncacerts, cacertFile,
isServer, errp) < 0) {
goto cleanup;
}
ret = 0;
cleanup:
if (cert) {
gnutls_x509_crt_deinit(cert);
}
for (i = 0; i < ncacerts; i++) {
gnutls_x509_crt_deinit(cacerts[i]);
}
return ret;
}
static int
qcrypto_tls_creds_x509_load(QCryptoTLSCredsX509 *creds,
Error **errp)
{
char *cacert = NULL, *cacrl = NULL, *cert = NULL,
*key = NULL, *dhparams = NULL;
int ret;
int rv = -1;
trace_qcrypto_tls_creds_x509_load(creds,
creds->parent_obj.dir ? creds->parent_obj.dir : "<nodir>");
if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
if (qcrypto_tls_creds_get_path(&creds->parent_obj,
QCRYPTO_TLS_CREDS_X509_CA_CERT,
true, &cacert, errp) < 0 ||
qcrypto_tls_creds_get_path(&creds->parent_obj,
QCRYPTO_TLS_CREDS_X509_CA_CRL,
false, &cacrl, errp) < 0 ||
qcrypto_tls_creds_get_path(&creds->parent_obj,
QCRYPTO_TLS_CREDS_X509_SERVER_CERT,
true, &cert, errp) < 0 ||
qcrypto_tls_creds_get_path(&creds->parent_obj,
QCRYPTO_TLS_CREDS_X509_SERVER_KEY,
true, &key, errp) < 0 ||
qcrypto_tls_creds_get_path(&creds->parent_obj,
QCRYPTO_TLS_CREDS_DH_PARAMS,
false, &dhparams, errp) < 0) {
goto cleanup;
}
} else {
if (qcrypto_tls_creds_get_path(&creds->parent_obj,
QCRYPTO_TLS_CREDS_X509_CA_CERT,
true, &cacert, errp) < 0 ||
qcrypto_tls_creds_get_path(&creds->parent_obj,
QCRYPTO_TLS_CREDS_X509_CLIENT_CERT,
false, &cert, errp) < 0 ||
qcrypto_tls_creds_get_path(&creds->parent_obj,
QCRYPTO_TLS_CREDS_X509_CLIENT_KEY,
false, &key, errp) < 0) {
goto cleanup;
}
}
if (creds->sanityCheck &&
qcrypto_tls_creds_x509_sanity_check(creds,
creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER,
cacert, cert, errp) < 0) {
goto cleanup;
}
ret = gnutls_certificate_allocate_credentials(&creds->data);
if (ret < 0) {
error_setg(errp, "Cannot allocate credentials: '%s'",
gnutls_strerror(ret));
goto cleanup;
}
ret = gnutls_certificate_set_x509_trust_file(creds->data,
cacert,
GNUTLS_X509_FMT_PEM);
if (ret < 0) {
error_setg(errp, "Cannot load CA certificate '%s': %s",
cacert, gnutls_strerror(ret));
goto cleanup;
}
if (cert != NULL && key != NULL) {
char *password = NULL;
if (creds->passwordid) {
password = qcrypto_secret_lookup_as_utf8(creds->passwordid,
errp);
if (!password) {
goto cleanup;
}
}
ret = gnutls_certificate_set_x509_key_file2(creds->data,
cert, key,
GNUTLS_X509_FMT_PEM,
password,
0);
g_free(password);
if (ret < 0) {
error_setg(errp, "Cannot load certificate '%s' & key '%s': %s",
cert, key, gnutls_strerror(ret));
goto cleanup;
}
}
if (cacrl != NULL) {
ret = gnutls_certificate_set_x509_crl_file(creds->data,
cacrl,
GNUTLS_X509_FMT_PEM);
if (ret < 0) {
error_setg(errp, "Cannot load CRL '%s': %s",
cacrl, gnutls_strerror(ret));
goto cleanup;
}
}
if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
if (qcrypto_tls_creds_get_dh_params_file(&creds->parent_obj, dhparams,
&creds->parent_obj.dh_params,
errp) < 0) {
goto cleanup;
}
gnutls_certificate_set_dh_params(creds->data,
creds->parent_obj.dh_params);
}
rv = 0;
cleanup:
g_free(cacert);
g_free(cacrl);
g_free(cert);
g_free(key);
g_free(dhparams);
return rv;
}
static void
qcrypto_tls_creds_x509_unload(QCryptoTLSCredsX509 *creds)
{
if (creds->data) {
gnutls_certificate_free_credentials(creds->data);
creds->data = NULL;
}
if (creds->parent_obj.dh_params) {
gnutls_dh_params_deinit(creds->parent_obj.dh_params);
creds->parent_obj.dh_params = NULL;
}
}
#else /* ! CONFIG_GNUTLS */
static void
qcrypto_tls_creds_x509_load(QCryptoTLSCredsX509 *creds G_GNUC_UNUSED,
Error **errp)
{
error_setg(errp, "TLS credentials support requires GNUTLS");
}
static void
qcrypto_tls_creds_x509_unload(QCryptoTLSCredsX509 *creds G_GNUC_UNUSED)
{
/* nada */
}
#endif /* ! CONFIG_GNUTLS */
static void
qcrypto_tls_creds_x509_prop_set_loaded(Object *obj,
bool value,
Error **errp)
{
QCryptoTLSCredsX509 *creds = QCRYPTO_TLS_CREDS_X509(obj);
if (value) {
qcrypto_tls_creds_x509_load(creds, errp);
} else {
qcrypto_tls_creds_x509_unload(creds);
}
}
#ifdef CONFIG_GNUTLS
static bool
qcrypto_tls_creds_x509_prop_get_loaded(Object *obj,
Error **errp G_GNUC_UNUSED)
{
QCryptoTLSCredsX509 *creds = QCRYPTO_TLS_CREDS_X509(obj);
return creds->data != NULL;
}
#else /* ! CONFIG_GNUTLS */
static bool
qcrypto_tls_creds_x509_prop_get_loaded(Object *obj G_GNUC_UNUSED,
Error **errp G_GNUC_UNUSED)
{
return false;
}
#endif /* ! CONFIG_GNUTLS */
static void
qcrypto_tls_creds_x509_prop_set_sanity(Object *obj,
bool value,
Error **errp G_GNUC_UNUSED)
{
QCryptoTLSCredsX509 *creds = QCRYPTO_TLS_CREDS_X509(obj);
creds->sanityCheck = value;
}
static void
qcrypto_tls_creds_x509_prop_set_passwordid(Object *obj,
const char *value,
Error **errp G_GNUC_UNUSED)
{
QCryptoTLSCredsX509 *creds = QCRYPTO_TLS_CREDS_X509(obj);
creds->passwordid = g_strdup(value);
}
static char *
qcrypto_tls_creds_x509_prop_get_passwordid(Object *obj,
Error **errp G_GNUC_UNUSED)
{
QCryptoTLSCredsX509 *creds = QCRYPTO_TLS_CREDS_X509(obj);
return g_strdup(creds->passwordid);
}
static bool
qcrypto_tls_creds_x509_prop_get_sanity(Object *obj,
Error **errp G_GNUC_UNUSED)
{
QCryptoTLSCredsX509 *creds = QCRYPTO_TLS_CREDS_X509(obj);
return creds->sanityCheck;
}
static void
qcrypto_tls_creds_x509_complete(UserCreatable *uc, Error **errp)
{
object_property_set_bool(OBJECT(uc), true, "loaded", errp);
}
static void
qcrypto_tls_creds_x509_init(Object *obj)
{
QCryptoTLSCredsX509 *creds = QCRYPTO_TLS_CREDS_X509(obj);
creds->sanityCheck = true;
}
static void
qcrypto_tls_creds_x509_finalize(Object *obj)
{
QCryptoTLSCredsX509 *creds = QCRYPTO_TLS_CREDS_X509(obj);
g_free(creds->passwordid);
qcrypto_tls_creds_x509_unload(creds);
}
static void
qcrypto_tls_creds_x509_class_init(ObjectClass *oc, void *data)
{
UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
ucc->complete = qcrypto_tls_creds_x509_complete;
object_class_property_add_bool(oc, "loaded",
qcrypto_tls_creds_x509_prop_get_loaded,
qcrypto_tls_creds_x509_prop_set_loaded);
object_class_property_add_bool(oc, "sanity-check",
qcrypto_tls_creds_x509_prop_get_sanity,
qcrypto_tls_creds_x509_prop_set_sanity);
object_class_property_add_str(oc, "passwordid",
qcrypto_tls_creds_x509_prop_get_passwordid,
qcrypto_tls_creds_x509_prop_set_passwordid);
}
static const TypeInfo qcrypto_tls_creds_x509_info = {
.parent = TYPE_QCRYPTO_TLS_CREDS,
.name = TYPE_QCRYPTO_TLS_CREDS_X509,
.instance_size = sizeof(QCryptoTLSCredsX509),
.instance_init = qcrypto_tls_creds_x509_init,
.instance_finalize = qcrypto_tls_creds_x509_finalize,
.class_size = sizeof(QCryptoTLSCredsX509Class),
.class_init = qcrypto_tls_creds_x509_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_USER_CREATABLE },
{ }
}
};
static void
qcrypto_tls_creds_x509_register_types(void)
{
type_register_static(&qcrypto_tls_creds_x509_info);
}
type_init(qcrypto_tls_creds_x509_register_types);
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