auth_token.h

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/*
 *  OpenVPN -- An application to securely tunnel IP networks
 *             over a single TCP/UDP port, with support for SSL/TLS-based
 *             session authentication and key exchange,
 *             packet encryption, packet authentication, and
 *             packet compression.
 *
 *  Copyright (C) 2002-2018 OpenVPN Inc <sales@openvpn.net>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  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 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.
 */
#ifndef AUTH_TOKEN_H
#define AUTH_TOKEN_H

void
generate_auth_token(const struct user_pass *up, struct tls_multi *multi);

unsigned
verify_auth_token(struct user_pass *up, struct tls_multi *multi,
                  struct tls_session *session);



void
auth_token_init_secret(struct key_ctx *key_ctx, const char *key_file,
                       bool key_inline);


void auth_token_write_server_key_file(const char *filename);


void add_session_token_env(struct tls_session *session, struct tls_multi *multi,
                           const struct user_pass *up);

void wipe_auth_token(struct tls_multi *multi);

#define SESSION_ID_PREFIX "SESS_ID_AT_"

static inline bool
is_auth_token(const char *password)
{
    return (memcmp_constant_time(SESSION_ID_PREFIX, password,
                                 strlen(SESSION_ID_PREFIX)) == 0);
}
#endif /* AUTH_TOKEN_H */