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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) 2002-2021 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.
*/
/*
* OpenVPN plugin module to do PAM authentication using a split
* privilege model.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include <ctype.h>
#include <stdbool.h>
#include <stdlib.h>
#include <sys/types.h>
#include <stdint.h>
#include "utils.h"
char *
searchandreplace(const char *tosearch, const char *searchfor, const char *replacewith)
{
if (!tosearch || !searchfor || !replacewith)
{
return NULL;
}
size_t tosearchlen = strlen(tosearch);
size_t replacewithlen = strlen(replacewith);
size_t templen = tosearchlen * replacewithlen;
if (tosearchlen == 0 || strlen(searchfor) == 0 || replacewithlen == 0)
{
return NULL;
}
bool is_potential_integer_overflow = (templen == SIZE_MAX) || (templen / tosearchlen != replacewithlen);
if (is_potential_integer_overflow)
{
return NULL;
}
/* state: all parameters are valid */
const char *searching = tosearch;
char *scratch;
char temp[templen+1];
temp[0] = 0;
scratch = strstr(searching,searchfor);
if (!scratch)
{
return strdup(tosearch);
}
while (scratch)
{
strncat(temp,searching,scratch-searching);
strcat(temp,replacewith);
searching = scratch+strlen(searchfor);
scratch = strstr(searching,searchfor);
}
return strdup(temp);
}
const char *
get_env(const char *name, const char *envp[])
{
if (envp)
{
int i;
const int namelen = strlen(name);
for (i = 0; envp[i]; ++i)
{
if (!strncmp(envp[i], name, namelen))
{
const char *cp = envp[i] + namelen;
if (*cp == '=')
{
return cp + 1;
}
}
}
}
return NULL;
}
int
string_array_len(const char *array[])
{
int i = 0;
if (array)
{
while (array[i])
{
++i;
}
}
return i;
}
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