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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012-2022 OpenVPN Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
#ifndef OPENVPN_COMMON_PEERCRED_H
#define OPENVPN_COMMON_PEERCRED_H
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <openvpn/common/platform.hpp>
#include <openvpn/common/exception.hpp>
#if defined(__APPLE__) || defined(__FreeBSD__)
#include <sys/ucred.h>
#endif
namespace openvpn {
namespace SockOpt {
struct Creds
{
Creds(const int uid_arg = -1, const int gid_arg = -1, const int pid_arg = -1)
: uid(uid_arg),
gid(gid_arg),
pid(pid_arg)
{
}
bool root_or_self_uid() const
{
return !uid || uid == ::getuid();
}
bool root_uid() const
{
return !uid;
}
bool match_uid(const uid_t other_uid) const
{
return uid >= 0 && uid == other_uid;
}
uid_t uid;
uid_t gid;
pid_t pid;
};
// get credentials of process on other side of unix socket
inline bool peercreds(const int fd, Creds &cr)
{
#if defined(__APPLE__) || defined(__FreeBSD__)
xucred cred;
socklen_t credLen = sizeof(cred);
if (::getsockopt(fd, SOL_LOCAL, LOCAL_PEERCRED, &cred, &credLen) != 0)
return false;
cr = Creds(cred.cr_uid, cred.cr_gid);
return true;
#elif defined(OPENVPN_PLATFORM_LINUX)
struct ucred uc;
socklen_t uc_len = sizeof(uc);
if (::getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &uc, &uc_len) != 0)
return false;
cr = Creds(uc.uid, uc.gid, uc.pid);
return true;
#else
#error no implementation for peercreds()
#endif
}
} // namespace SockOpt
} // namespace openvpn
#endif
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