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/*
* session handling routines
*
* Copyright (C) 2014-2024 LastPass.
*
* 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.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
*
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*
* See LICENSE.OpenSSL for more details regarding this exception.
*/
#include "xml.h"
#include "config.h"
#include "util.h"
#include "cipher.h"
#include "agent.h"
#include "upload-queue.h"
#include <sys/mman.h>
#include <string.h>
struct session *session_new(void)
{
return new0(struct session, 1);
}
void session_free(struct session *session)
{
if (!session)
return;
free(session->uid);
free(session->sessionid);
free(session->token);
free(session->private_key.key);
free(session->server);
free(session);
}
bool session_is_valid(struct session *session)
{
return session && session->uid && session->sessionid && session->token;
}
void session_set_private_key(struct session *session, unsigned const char key[KDF_HASH_LEN], const char *key_hex)
{
cipher_decrypt_private_key(key_hex, key, &session->private_key);
}
void session_save(struct session *session, unsigned const char key[KDF_HASH_LEN])
{
config_write_encrypted_string("session_uid", session->uid, key);
config_write_encrypted_string("session_sessionid", session->sessionid, key);
config_write_encrypted_string("session_token", session->token, key);
config_write_encrypted_buffer("session_privatekey", (char *)session->private_key.key, session->private_key.len, key);
feature_flag_save(&session->feature_flag, key);
/*
* existing sessions may not have a server yet; they will fall back
* to lastpass.com.
*/
if (session->server)
config_write_string("session_server", session->server);
}
struct session *session_load(unsigned const char key[KDF_HASH_LEN])
{
struct session *session = session_new();
session->uid = config_read_encrypted_string("session_uid", key);
session->sessionid = config_read_encrypted_string("session_sessionid", key);
session->token = config_read_encrypted_string("session_token", key);
session->server = config_read_string("session_server");
session->private_key.len = config_read_encrypted_buffer("session_privatekey", &session->private_key.key, key);
mlock(session->private_key.key, session->private_key.len);
feature_flag_load(&session->feature_flag, key);
if (session_is_valid(session))
return session;
else {
session_free(session);
return NULL;
}
}
void session_kill()
{
config_unlink("verify");
config_unlink("username");
config_unlink("session_sessionid");
config_unlink("iterations");
config_unlink("blob");
config_unlink("session_token");
config_unlink("session_uid");
config_unlink("session_privatekey");
config_unlink("session_server");
config_unlink("plaintext_key");
feature_flag_cleanup();
agent_kill();
upload_queue_kill();
}
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