161 lines
4.0 KiB
C
161 lines
4.0 KiB
C
/*
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* MUSCLE SmartCard Development ( https://pcsclite.apdu.fr/ )
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*
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* Copyright (C) 2013 Red Hat
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*
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* All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* Author: Nikos Mavrogiannopoulos <nmav@redhat.com>
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*/
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/**
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* @file
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* @brief polkit authorization of clients
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*
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* IsClientAuthorized() checks whether the connecting client is authorized
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* to access the resources using polkit.
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*/
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#include "config.h"
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#define _GNU_SOURCE
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/un.h>
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#include <stdio.h>
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#include "debuglog.h"
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#include "auth.h"
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#include <errno.h>
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#if defined(HAVE_POLKIT) && defined(SO_PEERCRED)
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#include <polkit/polkit.h>
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/* Returns non zero when the client is authorized */
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unsigned IsClientAuthorized(int socket, const char* action, const char* reader)
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{
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struct ucred cr;
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socklen_t cr_len;
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int ret;
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PolkitSubject *subject;
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PolkitAuthority *authority;
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PolkitAuthorizationResult *result;
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PolkitDetails *details;
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GError *error = NULL;
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char action_name[128];
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snprintf(action_name, sizeof(action_name), "org.debian.pcsc-lite.%s", action);
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cr_len = sizeof(cr);
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ret = getsockopt(socket, SOL_SOCKET, SO_PEERCRED, &cr, &cr_len);
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if (ret == -1)
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{
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int e = errno;
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Log2(PCSC_LOG_CRITICAL,
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"Error obtaining client process credentials: %s", strerror(e));
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return 0;
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}
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authority = polkit_authority_get_sync(NULL, NULL);
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if (authority == NULL)
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{
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Log1(PCSC_LOG_CRITICAL, "polkit_authority_get_sync failed");
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return 0;
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}
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subject = polkit_unix_process_new_for_owner(cr.pid, 0, cr.uid);
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if (subject == NULL)
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{
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Log1(PCSC_LOG_CRITICAL, "polkit_unix_process_new_for_owner failed");
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ret = 0;
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goto cleanup1;
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}
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details = polkit_details_new();
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if (details == NULL)
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{
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Log1(PCSC_LOG_CRITICAL, "polkit_details_new failed");
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ret = 0;
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goto cleanup0;
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}
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if (reader != NULL)
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polkit_details_insert(details, "reader", reader);
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result = polkit_authority_check_authorization_sync(authority, subject,
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action_name, details,
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POLKIT_CHECK_AUTHORIZATION_FLAGS_ALLOW_USER_INTERACTION,
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NULL,
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&error);
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if (result == NULL)
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{
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Log2(PCSC_LOG_CRITICAL, "Error in authorization: %s", error->message);
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g_error_free(error);
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ret = 0;
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}
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else
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{
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if (polkit_authorization_result_get_is_authorized(result))
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{
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ret = 1;
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}
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else
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{
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ret = 0;
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}
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}
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if (ret == 0)
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{
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Log4(PCSC_LOG_CRITICAL,
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"Process %u (user: %u) is NOT authorized for action: %s",
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(unsigned)cr.pid, (unsigned)cr.uid, action);
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}
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g_object_unref(subject);
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cleanup0:
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g_object_unref(details);
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cleanup1:
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g_object_unref(authority);
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return ret;
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}
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#else
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unsigned IsClientAuthorized(int socket, const char* action, const char* reader)
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{
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(void)socket;
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(void)action;
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(void)reader;
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return 1;
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}
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#endif
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