Imported Upstream version 1.1.90 upstream/1.1.90

1 files changed, 389 insertions, 0 deletions

diff --git a/src/nm-audit-manager.c b/src/nm-audit-manager.c
new file mode 100644
index 00000000..007e4321
--- /dev/null
+++ b/src/nm-audit-manager.c
@@ -0,0 +1,389 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
+/* NetworkManager audit support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Copyright 2015 Red Hat, Inc.
+ */
+
+#include "config.h"
+
+#include <errno.h>
+#include <string.h>
+#if HAVE_LIBAUDIT
+#include <libaudit.h>
+#endif
+
+#include "gsystem-local-alloc.h"
+#include "nm-audit-manager.h"
+#include "nm-glib.h"
+#include "nm-auth-subject.h"
+#include "nm-config.h"
+#include "nm-logging.h"
+#include "nm-macros-internal.h"
+#include "nm-settings-connection.h"
+
+#define AUDIT_LOG_LEVEL LOGL_INFO
+
+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;
+
+#if HAVE_LIBAUDIT
+typedef struct {
+	NMConfig *config;
+	int auditd_fd;
+} NMAuditManagerPrivate;
+
+#define NM_AUDIT_MANAGER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), NM_TYPE_AUDIT_MANAGER, NMAuditManagerPrivate))
+#endif
+
+G_DEFINE_TYPE (NMAuditManager, nm_audit_manager, G_TYPE_OBJECT)
+
+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_HAS (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);
+		_nm_log_impl (file, line, func, AUDIT_LOG_LEVEL, LOGD_AUDIT, 0, "%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_auth_subject_new_unix_process_from_context (context);
+		} else
+			g_warn_if_reached ();
+	}
+	if (subject && nm_auth_subject_is_unix_process (subject)) {
+		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, gpointer subject_context, const char *reason)
+{
+	gs_unref_ptrarray GPtrArray *fields = NULL;
+	AuditField uuid_field = { }, name_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);
+	}
+
+	_audit_log_helper (self, fields, file, line, func, op, result, subject_context, reason);
+}
+
+void
+_nm_audit_manager_log_control_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, gpointer subject_context,
+                                 const char *reason)
+{
+	gs_unref_ptrarray GPtrArray *fields = NULL;
+	AuditField interface_field = { }, ifindex_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);
+	}
+
+	_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);
+
+	if (nm_config_data_get_value_boolean (data, NM_CONFIG_KEYFILE_GROUP_LOGGING,
+	                                      NM_CONFIG_KEYFILE_KEY_AUDIT,
+	                                      NM_CONFIG_DEFAULT_LOGGING_AUDIT)) {
+		if (priv->auditd_fd < 0) {
+			priv->auditd_fd = audit_open ();
+			if (priv->auditd_fd < 0) {
+				nm_log_err (LOGD_CORE, "failed to open auditd socket: %s",
+				            strerror (errno));
+			} else
+				nm_log_dbg (LOGD_CORE, "audit socket created");
+		}
+	} else {
+		if (priv->auditd_fd >= 0) {
+			audit_close (priv->auditd_fd);
+			priv->auditd_fd = -1;
+			nm_log_dbg (LOGD_CORE, "audit 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);
+
+#if HAVE_LIBAUDIT
+	g_type_class_add_private (klass, sizeof (NMAuditManagerPrivate));
+#endif
+
+	/* virtual methods */
+	object_class->dispose = dispose;
+}
+