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sharing: Add TLS certificate generation implementation

Browse source 
This copies TLS certificate generation implementation from
https://gitlab.gnome.org/chergert/bonsai. No changes were made other
than ones required for making it build as part of gnome-control-center's
sharing panel. It's currently not suitable to depend on libbonsai, as it
will likely see big changes before seeing a release.
This commit is contained in:
Jonas Ådahl 2022-02-21 18:36:33 +01:00 • committed by Felipe Borges
parent 0ae59467fb
commit 5eb46ec1b7
3 changed files with 581 additions and 1 deletions
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511
panels/sharing/cc-tls-certificate.c Normal file
View file

@ -0,0 +1,511 @@
/* cc-tls-certificate.c
*
* Copyright 2018 Christian Hergert <chergert@redhat.com>
*
* This file 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 3 of the
* License, or (at your option) any later version.
*
* This file 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 program. If not, see <http://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: LGPL-3.0-or-later
*/
#include "config.h"
#include <errno.h>
#include <string.h>
#include <glib/gstdio.h>
#include <gnutls/x509.h>
#include "cc-tls-certificate.h"
#define DEFAULT_KEY_SIZE 4096
#define DEFAULT_EXPIRATION (60L*60L*24L*5L*365L)
static void
_gnutls_datum_clear (gnutls_datum_t *datum)
{
if (datum->data != NULL)
gnutls_free (datum->data);
}
static void
_gnutls_crt_free (gnutls_x509_crt_t *cert)
{
if (cert != NULL)
gnutls_x509_crt_deinit (*cert);
}
static void
_gnutls_privkey_free (gnutls_x509_privkey_t *privkey)
{
if (privkey != NULL)
gnutls_x509_privkey_deinit (*privkey);
}
G_DEFINE_AUTO_CLEANUP_CLEAR_FUNC (gnutls_datum_t, _gnutls_datum_clear)
G_DEFINE_AUTOPTR_CLEANUP_FUNC (gnutls_x509_crt_t, _gnutls_crt_free)
G_DEFINE_AUTOPTR_CLEANUP_FUNC (gnutls_x509_privkey_t, _gnutls_privkey_free)
typedef struct
{
gchar *public_key_path;
gchar *private_key_path;
gchar *c;
gchar *cn;
} GenerateData;
static void
generate_data_free (GenerateData *data)
{
g_clear_pointer (&data->public_key_path, g_free);
g_clear_pointer (&data->private_key_path, g_free);
g_clear_pointer (&data->c, g_free);
g_clear_pointer (&data->cn, g_free);
g_slice_free (GenerateData, data);
}
static gboolean
make_directory_parent (const gchar *path,
GError **error)
{
g_autofree gchar *dir = NULL;
g_assert (path != NULL);
g_assert (error != NULL);
dir = g_path_get_dirname (path);
if (g_mkdir_with_parents (dir, 0750) == -1)
{
g_set_error_literal (error,
G_IO_ERROR,
g_io_error_from_errno (errno),
g_strerror (errno));
return FALSE;
}
return TRUE;
}
static void
bonsai_tls_certificate_generate_worker (GTask *task,
gpointer source_object,
gpointer task_data,
GCancellable *cancellable)
{
GenerateData *data = task_data;
g_autoptr(GTlsCertificate) certificate = NULL;
g_autoptr(GError) error = NULL;
g_autoptr(gnutls_x509_crt_t) certptr = NULL;
g_autoptr(gnutls_x509_privkey_t) privkeyptr = NULL;
g_auto(gnutls_datum_t) pubkey_data = {0};
g_auto(gnutls_datum_t) privkey_data = {0};
g_autofree char *dn = NULL;
gnutls_x509_privkey_t privkey;
gnutls_x509_crt_t cert;
guint32 serial = 1;
int gtlsret = 0;
g_assert (G_IS_TASK (task));
g_assert (source_object == NULL);
g_assert (data != NULL);
g_assert (data->public_key_path != NULL);
g_assert (data->private_key_path != NULL);
g_assert (data->c != NULL);
g_assert (data->cn != NULL);
if (!make_directory_parent (data->public_key_path, &error) ||
!make_directory_parent (data->private_key_path, &error))
{
g_task_return_error (task, g_steal_pointer (&error));
return;
}
/*
* From the GnuTLS documentation:
*
* To be consistent with the X.509/PKIX specifications the provided serial
* should be a big-endian positive number (i.e. it's leftmost bit should be
* zero).
*/
serial = GUINT32_TO_BE (serial);
#define HANDLE_FAILURE(x) \
G_STMT_START { \
gtlsret = x; \
if (gtlsret != GNUTLS_E_SUCCESS) \
goto failure; \
} G_STMT_END
HANDLE_FAILURE (gnutls_x509_crt_init (&cert));
certptr = &cert;
HANDLE_FAILURE (gnutls_x509_crt_set_version (cert, 3));
HANDLE_FAILURE (gnutls_x509_crt_set_activation_time (cert, time (NULL)));
dn = g_strdup_printf ("C=%s,CN=%s", data->c, data->cn);
HANDLE_FAILURE (gnutls_x509_crt_set_dn (cert, dn, NULL));
HANDLE_FAILURE (gnutls_x509_crt_set_serial (cert, &serial, sizeof serial));
/* 5 years. We'll figure out key rotation in that time... */
HANDLE_FAILURE (gnutls_x509_crt_set_expiration_time (cert, time (NULL) + DEFAULT_EXPIRATION));
HANDLE_FAILURE (gnutls_x509_privkey_init (&privkey));
privkeyptr = &privkey;
HANDLE_FAILURE (gnutls_x509_privkey_generate (privkey, GNUTLS_PK_RSA, DEFAULT_KEY_SIZE, 0));
HANDLE_FAILURE (gnutls_x509_crt_set_key (cert, privkey));
HANDLE_FAILURE (gnutls_x509_crt_sign (cert, cert, privkey));
HANDLE_FAILURE (gnutls_x509_crt_export2 (cert, GNUTLS_X509_FMT_PEM, &pubkey_data));
if (!g_file_set_contents (data->public_key_path, (char *)pubkey_data.data, pubkey_data.size, &error))
goto failure;
HANDLE_FAILURE (gnutls_x509_privkey_export2 (privkey, GNUTLS_X509_FMT_PEM, &privkey_data));
if (!g_file_set_contents (data->private_key_path, (char*)privkey_data.data, privkey_data.size, &error))
goto failure;
#undef HANDLE_FAILURE
if ((certificate = g_tls_certificate_new_from_files (data->public_key_path, data->private_key_path, &error)))
{
g_task_return_pointer (task, g_steal_pointer (&certificate), g_object_unref);
return;
}
failure:
if (error != NULL)
g_task_return_error (task, g_steal_pointer (&error));
else if (gtlsret != 0)
g_task_return_new_error (task,
G_TLS_ERROR,
G_TLS_ERROR_MISC,
"GnuTLS Error: %s",
gnutls_strerror (gtlsret));
else
g_task_return_new_error (task,
G_IO_ERROR,
G_IO_ERROR_FAILED,
"Failed to generate TLS certificate pair");
}
void
bonsai_tls_certificate_new_generate_async (const gchar *public_key_path,
const gchar *private_key_path,
const gchar *c,
const gchar *cn,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
g_autoptr(GTask) task = NULL;
GenerateData *data;
g_return_if_fail (public_key_path != NULL);
g_return_if_fail (private_key_path != NULL);
g_return_if_fail (c != NULL);
g_return_if_fail (cn != NULL);
g_return_if_fail (!cancellable || G_IS_CANCELLABLE (cancellable));
task = g_task_new (NULL, cancellable, callback, user_data);
g_task_set_source_tag (task, bonsai_tls_certificate_new_generate_async);
data = g_slice_new0 (GenerateData);
data->public_key_path = g_strdup (public_key_path);
data->private_key_path = g_strdup (private_key_path);
data->c = g_strdup (c);
data->cn = g_strdup (cn);
g_task_set_task_data (task, data, (GDestroyNotify)generate_data_free);
g_task_run_in_thread (task, bonsai_tls_certificate_generate_worker);
}
GTlsCertificate *
bonsai_tls_certificate_new_generate_finish (GAsyncResult *result,
GError **error)
{
g_return_val_if_fail (G_IS_TASK (result), NULL);
return g_task_propagate_pointer (G_TASK (result), error);
}
GTlsCertificate *
bonsai_tls_certificate_new_generate (const gchar *public_key_path,
const gchar *private_key_path,
const gchar *c,
const gchar *cn,
GCancellable *cancellable,
GError **error)
{
g_autoptr(GTask) task = NULL;
GenerateData *data;
g_return_val_if_fail (public_key_path != NULL, NULL);
g_return_val_if_fail (private_key_path != NULL, NULL);
g_return_val_if_fail (c != NULL, NULL);
g_return_val_if_fail (cn != NULL, NULL);
g_return_val_if_fail (!cancellable || G_IS_CANCELLABLE (cancellable), NULL);
task = g_task_new (NULL, cancellable, NULL, NULL);
g_task_set_source_tag (task, bonsai_tls_certificate_new_generate);
data = g_slice_new0 (GenerateData);
data->public_key_path = g_strdup (public_key_path);
data->private_key_path = g_strdup (private_key_path);
data->c = g_strdup (c);
data->cn = g_strdup (cn);
g_task_set_task_data (task, data, (GDestroyNotify)generate_data_free);
bonsai_tls_certificate_generate_worker (task, NULL, data, cancellable);
return g_task_propagate_pointer (task, error);
}
gchar *
bonsai_tls_certificate_get_hash (GTlsCertificate *cert)
{
g_autoptr(GByteArray) bytesarray = NULL;
g_autoptr(GChecksum) checksum = NULL;
g_return_val_if_fail (G_IS_TLS_CERTIFICATE (cert), NULL);
g_object_get (cert, "certificate", &bytesarray, NULL);
checksum = g_checksum_new (G_CHECKSUM_SHA256);
g_checksum_update (checksum, bytesarray->data, bytesarray->len);
return g_ascii_strdown (g_checksum_get_string (checksum), -1);
}
typedef struct
{
gchar *public_key_path;
gchar *private_key_path;
gchar *c;
gchar *cn;
} NewFromFilesOrGenerate;
static void
new_from_files_or_generate_free (gpointer data)
{
NewFromFilesOrGenerate *state = data;
g_clear_pointer (&state->public_key_path, g_free);
g_clear_pointer (&state->private_key_path, g_free);
g_clear_pointer (&state->c, g_free);
g_clear_pointer (&state->cn, g_free);
g_free (state);
}
static void
bonsai_tls_certificate_new_from_files_or_generate_worker (GTask *task,
gpointer source_object,
gpointer task_data,
GCancellable *cancellable)
{
NewFromFilesOrGenerate *state = task_data;
g_autoptr(GTlsCertificate) certificate = NULL;
g_autoptr(GError) error = NULL;
g_assert (G_IS_TASK (task));
g_assert (!cancellable || G_IS_CANCELLABLE (cancellable));
g_assert (state != NULL);
g_assert (state->public_key_path != NULL);
g_assert (state->private_key_path != NULL);
/* Generate new public/private key for server if we need one.
* Ideally, we would generate something signed by a real CA
* for the user. But since this is "private cloud" oriented,
* we should be fine for now.
*/
if (!g_file_test (state->public_key_path, G_FILE_TEST_EXISTS) ||
!g_file_test (state->private_key_path, G_FILE_TEST_EXISTS))
certificate = bonsai_tls_certificate_new_generate (state->public_key_path,
state->private_key_path,
state->c,
state->cn,
cancellable,
&error);
else
certificate = g_tls_certificate_new_from_files (state->public_key_path,
state->private_key_path,
&error);
if (certificate == NULL)
g_task_return_error (task, g_steal_pointer (&error));
else
g_task_return_pointer (task, g_steal_pointer (&certificate), g_object_unref);
}
/**
* bonsai_tls_certificate_new_from_files_or_generate_async:
* @public_key_path: the path to the public key file
* @private_key_path: the path to the private key file
* @cancellable: (nullable): a #GCancellable or %NULL
* @callback: a callback to execute upon completion
* @user_data: closure data for @callback
*
* Asynchronously requests that a certificate is loaded, or generate one if it
* does not yet exist. The generated certificate is a self-signed certificate.
*
* Since: 0.2
*/
void
bonsai_tls_certificate_new_from_files_or_generate_async (const gchar *public_key_path,
const gchar *private_key_path,
const gchar *c,
const gchar *cn,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
g_autoptr(GTask) task = NULL;
NewFromFilesOrGenerate state;
g_assert (public_key_path != NULL);
g_assert (private_key_path != NULL);
g_assert (!cancellable || G_IS_CANCELLABLE (cancellable));
state.public_key_path = g_strdup (public_key_path);
state.private_key_path = g_strdup (private_key_path);
state.c = g_strdup (c);
state.cn = g_strdup (cn);
task = g_task_new (NULL, cancellable, callback, user_data);
g_task_set_source_tag (task, bonsai_tls_certificate_new_from_files_or_generate_async);
g_task_set_task_data (task, g_memdup2 (&state, sizeof state), new_from_files_or_generate_free);
g_task_run_in_thread (task, bonsai_tls_certificate_new_from_files_or_generate_worker);
}
/**
* bonsai_tls_certificate_new_from_files_or_generate_finish:
* @result: a #GAsyncResult provided to callback
* @error: a location for a #GError, or %NULL
*
* Completes a request to
* bonsai_tls_certificate_new_from_files_or_generate_async() which will
* either load a #GTlsCertificate for the files if they exist, or generate
* a new self-signed certificate in their place.
*
* Returns: (transfer none): a #GTlsCertificate or %NULL and @error is set.
*
* Since: 0.2
*/
GTlsCertificate *
bonsai_tls_certificate_new_from_files_or_generate_finish (GAsyncResult *result,
GError **error)
{
g_assert (G_IS_TASK (result));
return g_task_propagate_pointer (G_TASK (result), error);
}
/**
* bonsai_tls_certificate_new_from_files_or_generate:
* @public_key_path: the path to the public key
* @private_key_path: the path to the private key
* @c: the C for the certificate
* @cn: the CN for the certificate
* @cancellable: (nullable): a #GCancellable or %NULL
* @error: the location for the error
*
* Loads a certificate or generates a new self-signed certificate in
* it's place.
*
* Returns: (transfer full): a #GTlsCertificate or %NULL and @error is set
*
* Since: 0.2
*/
GTlsCertificate *
bonsai_tls_certificate_new_from_files_or_generate (const gchar *public_key_path,
const gchar *private_key_path,
const gchar *c,
const gchar *cn,
GCancellable *cancellable,
GError **error)
{
GTlsCertificate *ret;
g_return_val_if_fail (public_key_path != NULL, NULL);
g_return_val_if_fail (private_key_path != NULL, NULL);
g_return_val_if_fail (c != NULL, NULL);
g_return_val_if_fail (cn != NULL, NULL);
g_return_val_if_fail (!cancellable || G_IS_CANCELLABLE (cancellable), NULL);
if (!(ret = g_tls_certificate_new_from_files (public_key_path, private_key_path, NULL)))
ret = bonsai_tls_certificate_new_generate (public_key_path,
private_key_path,
c,
cn,
cancellable,
error);
return g_steal_pointer (&ret);
}
/**
* bonsai_tls_certificate_new_for_user:
* @public_key_path: the path to the public key
* @private_key_path: the path to the private key
*
* This is a simplified form to create a new certificate or load a previously
* created certificate for the current user.
*
* Returns: (transfer none): a #GTlsCertificate or %NULL and @error is set.
*
* Since: 0.2
*/
GTlsCertificate *
bonsai_tls_certificate_new_for_user (GCancellable *cancellable,
GError **error)
{
g_autofree gchar *public_key_path = NULL;
g_autofree gchar *private_key_path = NULL;
g_return_val_if_fail (!cancellable || G_IS_CANCELLABLE (cancellable), NULL);
public_key_path = g_build_filename (g_get_user_config_dir (), "bonsai", "public.key", NULL);
private_key_path = g_build_filename (g_get_user_config_dir (), "bonsai", "private.key", NULL);
return bonsai_tls_certificate_new_from_files_or_generate (public_key_path,
private_key_path,
"US",
"GNOME",
cancellable,
error);
}
gboolean
bonsai_is_tls_hash (const gchar *hash)
{
guint len = 0;
if (hash == NULL)
return FALSE;
for (; *hash; hash++)
{
if (len == 64)
return FALSE;
switch (*hash)
{
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
len++;
break;
default:
return FALSE;
}
}
return len == 64;
}

63
panels/sharing/cc-tls-certificate.h Normal file
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@ -0,0 +1,63 @@
/* cc-tls-certificate.h
*
* Copyright 2018 Christian Hergert <chergert@redhat.com>
*
* This file 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 3 of the
* License, or (at your option) any later version.
*
* This file 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 program. If not, see <http://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: LGPL-3.0-or-later
*/
#pragma once
#include <gio/gio.h>
G_BEGIN_DECLS
gboolean bonsai_is_tls_hash (const gchar *hash);
GTlsCertificate *bonsai_tls_certificate_new_generate (const gchar *public_key_path,
const gchar *private_key_path,
const gchar *c,
const gchar *cn,
GCancellable *cancellable,
GError **error);
void bonsai_tls_certificate_new_generate_async (const gchar *public_key_path,
const gchar *private_key_path,
const gchar *c,
const gchar *cn,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
GTlsCertificate *bonsai_tls_certificate_new_generate_finish (GAsyncResult *result,
GError **error);
gchar *bonsai_tls_certificate_get_hash (GTlsCertificate *cert);
GTlsCertificate *bonsai_tls_certificate_new_from_files_or_generate (const gchar *public_key_path,
const gchar *private_key_path,
const gchar *c,
const gchar *cn,
GCancellable *cancellable,
GError **error);
void bonsai_tls_certificate_new_from_files_or_generate_async (const gchar *public_key_path,
const gchar *private_key_path,
const gchar *c,
const gchar *cn,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
GTlsCertificate *bonsai_tls_certificate_new_from_files_or_generate_finish (GAsyncResult *result,
GError **error);
GTlsCertificate *bonsai_tls_certificate_new_for_user (GCancellable *cancellable,
GError **error);
G_END_DECLS

8
panels/sharing/meson.build
View file

@ -41,6 +41,7 @@ sources = files(
'cc-remote-login.c',
'cc-sharing-networks.c',
'cc-gnome-remote-desktop.c',
'cc-tls-certificate.c',
'file-share-properties.c',
)
@ -73,12 +74,17 @@ cflags += [
]
libsecret_dep = dependency('libsecret-1')
gnutls_dep = dependency('gnutls')
panels_libs += static_library(
cappletname,
sources: sources,
include_directories: [ top_inc, common_inc ],
dependencies: [common_deps, libsecret_dep],
dependencies: [
common_deps,
libsecret_dep,
gnutls_dep,
],
c_args: cflags
)