/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2011 Lennart Poettering systemd 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. systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <sys/types.h> #include <errno.h> #include "util.h" #include "dbus-common.h" #include "polkit.h" int verify_polkit( DBusConnection *c, DBusMessage *request, const char *action, bool interactive, bool *_challenge, DBusError *error) { #ifdef ENABLE_POLKIT DBusMessage *m = NULL, *reply = NULL; const char *unix_process = "unix-process", *pid = "pid", *starttime = "start-time", *cancel_id = ""; uint32_t flags = interactive ? 1 : 0; pid_t pid_raw; uint32_t pid_u32; unsigned long long starttime_raw; uint64_t starttime_u64; DBusMessageIter iter_msg, iter_struct, iter_array, iter_dict, iter_variant; int r; dbus_bool_t authorized = FALSE, challenge = FALSE; #endif const char *sender; unsigned long ul; assert(c); assert(request); sender = dbus_message_get_sender(request); if (!sender) return -EINVAL; ul = dbus_bus_get_unix_user(c, sender, error); if (ul == (unsigned long) -1) return -EINVAL; /* Shortcut things for root, to avoid the PK roundtrip and dependency */ if (ul == 0) return 1; #ifdef ENABLE_POLKIT pid_raw = bus_get_unix_process_id(c, sender, error); if (pid_raw == 0) return -EINVAL; r = get_starttime_of_pid(pid_raw, &starttime_raw); if (r < 0) return r; m = dbus_message_new_method_call( "org.freedesktop.PolicyKit1", "/org/freedesktop/PolicyKit1/Authority", "org.freedesktop.PolicyKit1.Authority", "CheckAuthorization"); if (!m) return -ENOMEM; dbus_message_iter_init_append(m, &iter_msg); pid_u32 = (uint32_t) pid_raw; starttime_u64 = (uint64_t) starttime_raw; if (!dbus_message_iter_open_container(&iter_msg, DBUS_TYPE_STRUCT, NULL, &iter_struct) || !dbus_message_iter_append_basic(&iter_struct, DBUS_TYPE_STRING, &unix_process) || !dbus_message_iter_open_container(&iter_struct, DBUS_TYPE_ARRAY, "{sv}", &iter_array) || !dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) || !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &pid) || !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "u", &iter_variant) || !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT32, &pid_u32) || !dbus_message_iter_close_container(&iter_dict, &iter_variant) || !dbus_message_iter_close_container(&iter_array, &iter_dict) || !dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) || !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &starttime) || !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "t", &iter_variant) || !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT64, &starttime_u64) || !dbus_message_iter_close_container(&iter_dict, &iter_variant) || !dbus_message_iter_close_container(&iter_array, &iter_dict) || !dbus_message_iter_close_container(&iter_struct, &iter_array) || !dbus_message_iter_close_container(&iter_msg, &iter_struct) || !dbus_message_iter_append_basic(&iter_msg, DBUS_TYPE_STRING, &action) || !dbus_message_iter_open_container(&iter_msg, DBUS_TYPE_ARRAY, "{ss}", &iter_array) || !dbus_message_iter_close_container(&iter_msg, &iter_array) || !dbus_message_iter_append_basic(&iter_msg, DBUS_TYPE_UINT32, &flags) || !dbus_message_iter_append_basic(&iter_msg, DBUS_TYPE_STRING, &cancel_id)) { r = -ENOMEM; goto finish; } reply = dbus_connection_send_with_reply_and_block(c, m, -1, error); if (!reply) { /* Treat no PK available as access denied */ if (dbus_error_has_name(error, DBUS_ERROR_SERVICE_UNKNOWN)) { r = -EACCES; dbus_error_free(error); goto finish; } r = -EIO; goto finish; } if (!dbus_message_iter_init(reply, &iter_msg) || dbus_message_iter_get_arg_type(&iter_msg) != DBUS_TYPE_STRUCT) { r = -EIO; goto finish; } dbus_message_iter_recurse(&iter_msg, &iter_struct); if (dbus_message_iter_get_arg_type(&iter_struct) != DBUS_TYPE_BOOLEAN) { r = -EIO; goto finish; } dbus_message_iter_get_basic(&iter_struct, &authorized); if (!dbus_message_iter_next(&iter_struct) || dbus_message_iter_get_arg_type(&iter_struct) != DBUS_TYPE_BOOLEAN) { r = -EIO; goto finish; } dbus_message_iter_get_basic(&iter_struct, &challenge); if (authorized) r = 1; else if (_challenge) { *_challenge = !!challenge; r = 0; } else r = -EPERM; finish: if (m) dbus_message_unref(m); if (reply) dbus_message_unref(reply); return r; #else return -EPERM; #endif }