/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2015 Red Hat, Inc.
*/
#include "src/core/nm-default-daemon.h"
#include "nm-audit-manager.h"
#if HAVE_LIBAUDIT
#include <libaudit.h>
#endif
#include "libnm-core-aux-intern/nm-auth-subject.h"
#include "nm-config.h"
#include "nm-dbus-manager.h"
#include "settings/nm-settings-connection.h"
/*****************************************************************************/
typedef enum {
BACKEND_LOG = (1 << 0),
BACKEND_AUDITD = (1 << 1),
_BACKEND_LAST,
BACKEND_ALL = ((_BACKEND_LAST - 1) << 1) - 1,
} AuditBackend;
typedef struct {
const char * name;
GValue value;
gboolean need_encoding;
AuditBackend backends;
} AuditField;
/*****************************************************************************/
typedef struct {
NMConfig *config;
int auditd_fd;
} NMAuditManagerPrivate;
struct _NMAuditManager {
GObject parent;
#if HAVE_LIBAUDIT
NMAuditManagerPrivate _priv;
#endif
};
struct _NMAuditManagerClass {
GObjectClass parent;
};
G_DEFINE_TYPE(NMAuditManager, nm_audit_manager, G_TYPE_OBJECT)
#define NM_AUDIT_MANAGER_GET_PRIVATE(self) \
_NM_GET_PRIVATE(self, NMAuditManager, NM_IS_AUDIT_MANAGER)
/*****************************************************************************/
#define AUDIT_LOG_LEVEL LOGL_INFO
#define _NMLOG_PREFIX_NAME "audit"
#define _NMLOG(level, domain, ...) \
G_STMT_START \
{ \
nm_log((level), \
(domain), \
NULL, \
NULL, \
"%s" _NM_UTILS_MACRO_FIRST(__VA_ARGS__), \
_NMLOG_PREFIX_NAME ": " _NM_UTILS_MACRO_REST(__VA_ARGS__)); \
} \
G_STMT_END
/*****************************************************************************/
NM_DEFINE_SINGLETON_GETTER(NMAuditManager, nm_audit_manager_get, NM_TYPE_AUDIT_MANAGER);
/*****************************************************************************/
static void
_audit_field_init_string(AuditField * field,
const char * name,
const char * str,
gboolean need_encoding,
AuditBackend backends)
{
field->name = name;
field->need_encoding = need_encoding;
field->backends = backends;
g_value_init(&field->value, G_TYPE_STRING);
g_value_set_static_string(&field->value, str);
}
static void
_audit_field_init_uint(AuditField *field, const char *name, uint val, AuditBackend backends)
{
field->name = name;
field->backends = backends;
g_value_init(&field->value, G_TYPE_UINT);
g_value_set_uint(&field->value, val);
}
static char *
build_message(GPtrArray *fields, AuditBackend backend)
{
GString * string;
AuditField *field;
gboolean first = TRUE;
guint i;
string = g_string_new(NULL);
for (i = 0; i < fields->len; i++) {
field = fields->pdata[i];
if (!NM_FLAGS_ANY(field->backends, backend))
continue;
if (first)
first = FALSE;
else
g_string_append_c(string, ' ');
if (G_VALUE_HOLDS_STRING(&field->value)) {
const char *str = g_value_get_string(&field->value);
#if HAVE_LIBAUDIT
if (backend == BACKEND_AUDITD) {
if (field->need_encoding) {
char *value;
value = audit_encode_nv_string(field->name, str, 0);
g_string_append(string, value);
g_free(value);
} else
g_string_append_printf(string, "%s=%s", field->name, str);
continue;
}
#endif /* HAVE_LIBAUDIT */
g_string_append_printf(string, "%s=\"%s\"", field->name, str);
} else if (G_VALUE_HOLDS_UINT(&field->value)) {
g_string_append_printf(string, "%s=%u", field->name, g_value_get_uint(&field->value));
} else
g_assert_not_reached();
}
return g_string_free(string, FALSE);
}
static void
nm_audit_log(NMAuditManager *self,
GPtrArray * fields,
const char * file,
guint line,
const char * func,
gboolean success)
{
#if HAVE_LIBAUDIT
NMAuditManagerPrivate *priv;
#endif
char *msg;
g_return_if_fail(NM_IS_AUDIT_MANAGER(self));
#if HAVE_LIBAUDIT
priv = NM_AUDIT_MANAGER_GET_PRIVATE(self);
if (priv->auditd_fd >= 0) {
msg = build_message(fields, BACKEND_AUDITD);
audit_log_user_message(priv->auditd_fd, AUDIT_USYS_CONFIG, msg, NULL, NULL, NULL, success);
g_free(msg);
}
#endif
if (nm_logging_enabled(AUDIT_LOG_LEVEL, LOGD_AUDIT)) {
msg = build_message(fields, BACKEND_LOG);
_NMLOG(AUDIT_LOG_LEVEL, LOGD_AUDIT, "%s", msg);
g_free(msg);
}
}
static void
_audit_log_helper(NMAuditManager *self,
GPtrArray * fields,
const char * file,
guint line,
const char * func,
const char * op,
gboolean result,
gpointer subject_context,
const char * reason)
{
AuditField op_field = {}, pid_field = {}, uid_field = {};
AuditField result_field = {}, reason_field = {};
gulong pid, uid;
NMAuthSubject * subject = NULL;
gs_unref_object NMAuthSubject *subject_free = NULL;
_audit_field_init_string(&op_field, "op", op, FALSE, BACKEND_ALL);
g_ptr_array_insert(fields, 0, &op_field);
if (subject_context) {
if (NM_IS_AUTH_SUBJECT(subject_context))
subject = subject_context;
else if (G_IS_DBUS_METHOD_INVOCATION(subject_context)) {
GDBusMethodInvocation *context = subject_context;
subject = subject_free = nm_dbus_manager_new_auth_subject_from_context(context);
} else
g_warn_if_reached();
}
if (subject && nm_auth_subject_get_subject_type(subject) == NM_AUTH_SUBJECT_TYPE_UNIX_PROCESS) {
pid = nm_auth_subject_get_unix_process_pid(subject);
uid = nm_auth_subject_get_unix_process_uid(subject);
if (pid != G_MAXULONG) {
_audit_field_init_uint(&pid_field, "pid", pid, BACKEND_ALL);
g_ptr_array_add(fields, &pid_field);
}
if (uid != G_MAXULONG) {
_audit_field_init_uint(&uid_field, "uid", uid, BACKEND_ALL);
g_ptr_array_add(fields, &uid_field);
}
}
_audit_field_init_string(&result_field,
"result",
result ? "success" : "fail",
FALSE,
BACKEND_ALL);
g_ptr_array_add(fields, &result_field);
if (reason) {
_audit_field_init_string(&reason_field, "reason", reason, FALSE, BACKEND_LOG);
g_ptr_array_add(fields, &reason_field);
}
nm_audit_log(self, fields, file, line, func, result);
}
gboolean
nm_audit_manager_audit_enabled(NMAuditManager *self)
{
#if HAVE_LIBAUDIT
NMAuditManagerPrivate *priv = NM_AUDIT_MANAGER_GET_PRIVATE(self);
if (priv->auditd_fd >= 0)
return TRUE;
#endif
return nm_logging_enabled(AUDIT_LOG_LEVEL, LOGD_AUDIT);
}
void
_nm_audit_manager_log_connection_op(NMAuditManager * self,
const char * file,
guint line,
const char * func,
const char * op,
NMSettingsConnection *connection,
gboolean result,
const char * args,
gpointer subject_context,
const char * reason)
{
gs_unref_ptrarray GPtrArray *fields = NULL;
AuditField uuid_field = {}, name_field = {}, args_field = {};
g_return_if_fail(op);
fields = g_ptr_array_new();
if (connection) {
_audit_field_init_string(&uuid_field,
"uuid",
nm_settings_connection_get_uuid(connection),
FALSE,
BACKEND_ALL);
g_ptr_array_add(fields, &uuid_field);
_audit_field_init_string(&name_field,
"name",
nm_settings_connection_get_id(connection),
TRUE,
BACKEND_ALL);
g_ptr_array_add(fields, &name_field);
}
if (args) {
_audit_field_init_string(&args_field, "args", args, FALSE, BACKEND_ALL);
g_ptr_array_add(fields, &args_field);
}
_audit_log_helper(self, fields, file, line, func, op, result, subject_context, reason);
}
void
_nm_audit_manager_log_generic_op(NMAuditManager *self,
const char * file,
guint line,
const char * func,
const char * op,
const char * arg,
gboolean result,
gpointer subject_context,
const char * reason)
{
gs_unref_ptrarray GPtrArray *fields = NULL;
AuditField arg_field = {};
g_return_if_fail(op);
g_return_if_fail(arg);
fields = g_ptr_array_new();
_audit_field_init_string(&arg_field, "arg", arg, TRUE, BACKEND_ALL);
g_ptr_array_add(fields, &arg_field);
_audit_log_helper(self, fields, file, line, func, op, result, subject_context, reason);
}
void
_nm_audit_manager_log_device_op(NMAuditManager *self,
const char * file,
guint line,
const char * func,
const char * op,
NMDevice * device,
gboolean result,
const char * args,
gpointer subject_context,
const char * reason)
{
gs_unref_ptrarray GPtrArray *fields = NULL;
AuditField interface_field = {}, ifindex_field = {}, args_field = {};
int ifindex;
g_return_if_fail(op);
g_return_if_fail(device);
fields = g_ptr_array_new();
_audit_field_init_string(&interface_field,
"interface",
nm_device_get_ip_iface(device),
TRUE,
BACKEND_ALL);
g_ptr_array_add(fields, &interface_field);
ifindex = nm_device_get_ip_ifindex(device);
if (ifindex > 0) {
_audit_field_init_uint(&ifindex_field, "ifindex", ifindex, BACKEND_ALL);
g_ptr_array_add(fields, &ifindex_field);
}
if (args) {
_audit_field_init_string(&args_field, "args", args, FALSE, BACKEND_ALL);
g_ptr_array_add(fields, &args_field);
}
_audit_log_helper(self, fields, file, line, func, op, result, subject_context, reason);
}
#if HAVE_LIBAUDIT
static void
init_auditd(NMAuditManager *self)
{
NMAuditManagerPrivate *priv = NM_AUDIT_MANAGER_GET_PRIVATE(self);
NMConfigData * data = nm_config_get_data(priv->config);
int errsv;
if (nm_config_data_get_value_boolean(data,
NM_CONFIG_KEYFILE_GROUP_LOGGING,
NM_CONFIG_KEYFILE_KEY_LOGGING_AUDIT,
NM_CONFIG_DEFAULT_LOGGING_AUDIT_BOOL)) {
if (priv->auditd_fd < 0) {
priv->auditd_fd = audit_open();
if (priv->auditd_fd < 0) {
errsv = errno;
_LOGE(LOGD_CORE, "failed to open auditd socket: %s", nm_strerror_native(errsv));
} else
_LOGD(LOGD_CORE, "socket created");
}
} else {
if (priv->auditd_fd >= 0) {
audit_close(priv->auditd_fd);
priv->auditd_fd = -1;
_LOGD(LOGD_CORE, "socket closed");
}
}
}
static void
config_changed_cb(NMConfig * config,
NMConfigData * config_data,
NMConfigChangeFlags changes,
NMConfigData * old_data,
NMAuditManager * self)
{
if (NM_FLAGS_HAS(changes, NM_CONFIG_CHANGE_VALUES))
init_auditd(self);
}
#endif
/*****************************************************************************/
static void
nm_audit_manager_init(NMAuditManager *self)
{
#if HAVE_LIBAUDIT
NMAuditManagerPrivate *priv = NM_AUDIT_MANAGER_GET_PRIVATE(self);
priv->config = g_object_ref(nm_config_get());
g_signal_connect(G_OBJECT(priv->config),
NM_CONFIG_SIGNAL_CONFIG_CHANGED,
G_CALLBACK(config_changed_cb),
self);
priv->auditd_fd = -1;
init_auditd(self);
#endif
}
static void
dispose(GObject *object)
{
#if HAVE_LIBAUDIT
NMAuditManager * self = NM_AUDIT_MANAGER(object);
NMAuditManagerPrivate *priv = NM_AUDIT_MANAGER_GET_PRIVATE(self);
if (priv->config) {
g_signal_handlers_disconnect_by_func(priv->config, config_changed_cb, self);
g_clear_object(&priv->config);
}
if (priv->auditd_fd >= 0) {
audit_close(priv->auditd_fd);
priv->auditd_fd = -1;
}
#endif
G_OBJECT_CLASS(nm_audit_manager_parent_class)->dispose(object);
}
static void
nm_audit_manager_class_init(NMAuditManagerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS(klass);
object_class->dispose = dispose;
}