diff options
Diffstat (limited to 'src/nm-audit-manager.c')
| -rw-r--r-- | src/nm-audit-manager.c | 389 |
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; +} + |