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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) 2002-2023 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "syshead.h"
#include "ssl_util.h"
char *
extract_var_peer_info(const char *peer_info, const char *var,
struct gc_arena *gc)
{
if (!peer_info)
{
return NULL;
}
const char *var_start = strstr(peer_info, var);
if (!var_start)
{
/* variable not found in peer info */
return NULL;
}
var_start += strlen(var);
const char *var_end = strstr(var_start, "\n");
if (!var_end)
{
/* var is at end of the peer_info list and no '\n' follows */
var_end = var_start + strlen(var_start);
}
char *var_value = string_alloc(var_start, gc);
/* NULL terminate the copy at the right position */
var_value[var_end - var_start] = '\0';
return var_value;
}
unsigned int
extract_iv_proto(const char *peer_info)
{
const char *optstr = peer_info ? strstr(peer_info, "IV_PROTO=") : NULL;
if (optstr)
{
int proto = 0;
int r = sscanf(optstr, "IV_PROTO=%d", &proto);
if (r == 1 && proto > 0)
{
return proto;
}
}
return 0;
}
const char *
options_string_compat_lzo(const char *options, struct gc_arena *gc)
{
/* Example string without and with comp-lzo, i.e. input/output of this function */
/* w/o comp: 'V4,dev-type tun,link-mtu 1457,tun-mtu 1400,proto UDPv4,auth SHA1,keysize 128,key-method 2,tls-server' */
/* comp-lzo: 'V4,dev-type tun,link-mtu 1458,tun-mtu 1400,proto UDPv4,comp-lzo,auth SHA1,keysize 128,key-method 2,tls-server' */
/* Note: since this function is used only in a very limited scope it makes
* assumptions how the string looks. Since we locally generated the string
* we can make these assumptions */
/* Check that the link-mtu string is in options */
const char *tmp = strstr(options, ",link-mtu");
if (!tmp)
{
return options;
}
/* Get old link_mtu size */
int link_mtu;
if (sscanf(tmp, ",link-mtu %d,", &link_mtu) != 1 || link_mtu < 100 || link_mtu > 9900)
{
return options;
}
/* 1 byte for the possibility of 999 to 1000 and 1 byte for the null
* terminator */
struct buffer buf = alloc_buf_gc(strlen(options) + strlen(",comp-lzo") + 2, gc);
buf_write(&buf, options, (int)(tmp - options));
/* Increase link-mtu by one for the comp-lzo opcode */
buf_printf(&buf, ",link-mtu %d", link_mtu + 1);
tmp += strlen(",link-mtu ") + (link_mtu < 1000 ? 3 : 4);
buf_printf(&buf, "%s,comp-lzo", tmp);
return BSTR(&buf);
}
/**
* SSL/TLS Cipher suite name translation table
*/
static const tls_cipher_name_pair tls_cipher_name_translation_table[] = {
{"ADH-SEED-SHA", "TLS-DH-anon-WITH-SEED-CBC-SHA"},
{"AES128-GCM-SHA256", "TLS-RSA-WITH-AES-128-GCM-SHA256"},
{"AES128-SHA256", "TLS-RSA-WITH-AES-128-CBC-SHA256"},
{"AES128-SHA", "TLS-RSA-WITH-AES-128-CBC-SHA"},
{"AES256-GCM-SHA384", "TLS-RSA-WITH-AES-256-GCM-SHA384"},
{"AES256-SHA256", "TLS-RSA-WITH-AES-256-CBC-SHA256"},
{"AES256-SHA", "TLS-RSA-WITH-AES-256-CBC-SHA"},
{"CAMELLIA128-SHA256", "TLS-RSA-WITH-CAMELLIA-128-CBC-SHA256"},
{"CAMELLIA128-SHA", "TLS-RSA-WITH-CAMELLIA-128-CBC-SHA"},
{"CAMELLIA256-SHA256", "TLS-RSA-WITH-CAMELLIA-256-CBC-SHA256"},
{"CAMELLIA256-SHA", "TLS-RSA-WITH-CAMELLIA-256-CBC-SHA"},
{"DES-CBC3-SHA", "TLS-RSA-WITH-3DES-EDE-CBC-SHA"},
{"DES-CBC-SHA", "TLS-RSA-WITH-DES-CBC-SHA"},
{"DH-DSS-SEED-SHA", "TLS-DH-DSS-WITH-SEED-CBC-SHA"},
{"DHE-DSS-AES128-GCM-SHA256", "TLS-DHE-DSS-WITH-AES-128-GCM-SHA256"},
{"DHE-DSS-AES128-SHA256", "TLS-DHE-DSS-WITH-AES-128-CBC-SHA256"},
{"DHE-DSS-AES128-SHA", "TLS-DHE-DSS-WITH-AES-128-CBC-SHA"},
{"DHE-DSS-AES256-GCM-SHA384", "TLS-DHE-DSS-WITH-AES-256-GCM-SHA384"},
{"DHE-DSS-AES256-SHA256", "TLS-DHE-DSS-WITH-AES-256-CBC-SHA256"},
{"DHE-DSS-AES256-SHA", "TLS-DHE-DSS-WITH-AES-256-CBC-SHA"},
{"DHE-DSS-CAMELLIA128-SHA256", "TLS-DHE-DSS-WITH-CAMELLIA-128-CBC-SHA256"},
{"DHE-DSS-CAMELLIA128-SHA", "TLS-DHE-DSS-WITH-CAMELLIA-128-CBC-SHA"},
{"DHE-DSS-CAMELLIA256-SHA256", "TLS-DHE-DSS-WITH-CAMELLIA-256-CBC-SHA256"},
{"DHE-DSS-CAMELLIA256-SHA", "TLS-DHE-DSS-WITH-CAMELLIA-256-CBC-SHA"},
{"DHE-DSS-SEED-SHA", "TLS-DHE-DSS-WITH-SEED-CBC-SHA"},
{"DHE-RSA-AES128-GCM-SHA256", "TLS-DHE-RSA-WITH-AES-128-GCM-SHA256"},
{"DHE-RSA-AES128-SHA256", "TLS-DHE-RSA-WITH-AES-128-CBC-SHA256"},
{"DHE-RSA-AES128-SHA", "TLS-DHE-RSA-WITH-AES-128-CBC-SHA"},
{"DHE-RSA-AES256-GCM-SHA384", "TLS-DHE-RSA-WITH-AES-256-GCM-SHA384"},
{"DHE-RSA-AES256-SHA256", "TLS-DHE-RSA-WITH-AES-256-CBC-SHA256"},
{"DHE-RSA-AES256-SHA", "TLS-DHE-RSA-WITH-AES-256-CBC-SHA"},
{"DHE-RSA-CAMELLIA128-SHA256", "TLS-DHE-RSA-WITH-CAMELLIA-128-CBC-SHA256"},
{"DHE-RSA-CAMELLIA128-SHA", "TLS-DHE-RSA-WITH-CAMELLIA-128-CBC-SHA"},
{"DHE-RSA-CAMELLIA256-SHA256", "TLS-DHE-RSA-WITH-CAMELLIA-256-CBC-SHA256"},
{"DHE-RSA-CAMELLIA256-SHA", "TLS-DHE-RSA-WITH-CAMELLIA-256-CBC-SHA"},
{"DHE-RSA-CHACHA20-POLY1305", "TLS-DHE-RSA-WITH-CHACHA20-POLY1305-SHA256"},
{"DHE-RSA-SEED-SHA", "TLS-DHE-RSA-WITH-SEED-CBC-SHA"},
{"DH-RSA-SEED-SHA", "TLS-DH-RSA-WITH-SEED-CBC-SHA"},
{"ECDH-ECDSA-AES128-GCM-SHA256", "TLS-ECDH-ECDSA-WITH-AES-128-GCM-SHA256"},
{"ECDH-ECDSA-AES128-SHA256", "TLS-ECDH-ECDSA-WITH-AES-128-CBC-SHA256"},
{"ECDH-ECDSA-AES128-SHA", "TLS-ECDH-ECDSA-WITH-AES-128-CBC-SHA"},
{"ECDH-ECDSA-AES256-GCM-SHA384", "TLS-ECDH-ECDSA-WITH-AES-256-GCM-SHA384"},
{"ECDH-ECDSA-AES256-SHA256", "TLS-ECDH-ECDSA-WITH-AES-256-CBC-SHA256"},
{"ECDH-ECDSA-AES256-SHA384", "TLS-ECDH-ECDSA-WITH-AES-256-CBC-SHA384"},
{"ECDH-ECDSA-AES256-SHA", "TLS-ECDH-ECDSA-WITH-AES-256-CBC-SHA"},
{"ECDH-ECDSA-CAMELLIA128-SHA256", "TLS-ECDH-ECDSA-WITH-CAMELLIA-128-CBC-SHA256"},
{"ECDH-ECDSA-CAMELLIA128-SHA", "TLS-ECDH-ECDSA-WITH-CAMELLIA-128-CBC-SHA"},
{"ECDH-ECDSA-CAMELLIA256-SHA256", "TLS-ECDH-ECDSA-WITH-CAMELLIA-256-CBC-SHA256"},
{"ECDH-ECDSA-CAMELLIA256-SHA", "TLS-ECDH-ECDSA-WITH-CAMELLIA-256-CBC-SHA"},
{"ECDH-ECDSA-DES-CBC3-SHA", "TLS-ECDH-ECDSA-WITH-3DES-EDE-CBC-SHA"},
{"ECDH-ECDSA-DES-CBC-SHA", "TLS-ECDH-ECDSA-WITH-DES-CBC-SHA"},
{"ECDH-ECDSA-RC4-SHA", "TLS-ECDH-ECDSA-WITH-RC4-128-SHA"},
{"ECDHE-ECDSA-AES128-GCM-SHA256", "TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256"},
{"ECDHE-ECDSA-AES128-SHA256", "TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA256"},
{"ECDHE-ECDSA-AES128-SHA384", "TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA384"},
{"ECDHE-ECDSA-AES128-SHA", "TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA"},
{"ECDHE-ECDSA-AES256-GCM-SHA384", "TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384"},
{"ECDHE-ECDSA-AES256-SHA256", "TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA256"},
{"ECDHE-ECDSA-AES256-SHA384", "TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA384"},
{"ECDHE-ECDSA-AES256-SHA", "TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA"},
{"ECDHE-ECDSA-CAMELLIA128-SHA256", "TLS-ECDHE-ECDSA-WITH-CAMELLIA-128-CBC-SHA256"},
{"ECDHE-ECDSA-CAMELLIA128-SHA", "TLS-ECDHE-ECDSA-WITH-CAMELLIA-128-CBC-SHA"},
{"ECDHE-ECDSA-CAMELLIA256-SHA256", "TLS-ECDHE-ECDSA-WITH-CAMELLIA-256-CBC-SHA256"},
{"ECDHE-ECDSA-CAMELLIA256-SHA", "TLS-ECDHE-ECDSA-WITH-CAMELLIA-256-CBC-SHA"},
{"ECDHE-ECDSA-CHACHA20-POLY1305", "TLS-ECDHE-ECDSA-WITH-CHACHA20-POLY1305-SHA256"},
{"ECDHE-ECDSA-DES-CBC3-SHA", "TLS-ECDHE-ECDSA-WITH-3DES-EDE-CBC-SHA"},
{"ECDHE-ECDSA-DES-CBC-SHA", "TLS-ECDHE-ECDSA-WITH-DES-CBC-SHA"},
{"ECDHE-ECDSA-RC4-SHA", "TLS-ECDHE-ECDSA-WITH-RC4-128-SHA"},
{"ECDHE-RSA-AES128-GCM-SHA256", "TLS-ECDHE-RSA-WITH-AES-128-GCM-SHA256"},
{"ECDHE-RSA-AES128-SHA256", "TLS-ECDHE-RSA-WITH-AES-128-CBC-SHA256"},
{"ECDHE-RSA-AES128-SHA384", "TLS-ECDHE-RSA-WITH-AES-128-CBC-SHA384"},
{"ECDHE-RSA-AES128-SHA", "TLS-ECDHE-RSA-WITH-AES-128-CBC-SHA"},
{"ECDHE-RSA-AES256-GCM-SHA384", "TLS-ECDHE-RSA-WITH-AES-256-GCM-SHA384"},
{"ECDHE-RSA-AES256-SHA256", "TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA256"},
{"ECDHE-RSA-AES256-SHA384", "TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA384"},
{"ECDHE-RSA-AES256-SHA", "TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA"},
{"ECDHE-RSA-CAMELLIA128-SHA256", "TLS-ECDHE-RSA-WITH-CAMELLIA-128-CBC-SHA256"},
{"ECDHE-RSA-CAMELLIA128-SHA", "TLS-ECDHE-RSA-WITH-CAMELLIA-128-CBC-SHA"},
{"ECDHE-RSA-CAMELLIA256-SHA256", "TLS-ECDHE-RSA-WITH-CAMELLIA-256-CBC-SHA256"},
{"ECDHE-RSA-CAMELLIA256-SHA", "TLS-ECDHE-RSA-WITH-CAMELLIA-256-CBC-SHA"},
{"ECDHE-RSA-CHACHA20-POLY1305", "TLS-ECDHE-RSA-WITH-CHACHA20-POLY1305-SHA256"},
{"ECDHE-RSA-DES-CBC3-SHA", "TLS-ECDHE-RSA-WITH-3DES-EDE-CBC-SHA"},
{"ECDHE-RSA-DES-CBC-SHA", "TLS-ECDHE-RSA-WITH-DES-CBC-SHA"},
{"ECDHE-RSA-RC4-SHA", "TLS-ECDHE-RSA-WITH-RC4-128-SHA"},
{"ECDH-RSA-AES128-GCM-SHA256", "TLS-ECDH-RSA-WITH-AES-128-GCM-SHA256"},
{"ECDH-RSA-AES128-SHA256", "TLS-ECDH-RSA-WITH-AES-128-CBC-SHA256"},
{"ECDH-RSA-AES128-SHA384", "TLS-ECDH-RSA-WITH-AES-128-CBC-SHA384"},
{"ECDH-RSA-AES128-SHA", "TLS-ECDH-RSA-WITH-AES-128-CBC-SHA"},
{"ECDH-RSA-AES256-GCM-SHA384", "TLS-ECDH-RSA-WITH-AES-256-GCM-SHA384"},
{"ECDH-RSA-AES256-SHA256", "TLS-ECDH-RSA-WITH-AES-256-CBC-SHA256"},
{"ECDH-RSA-AES256-SHA384", "TLS-ECDH-RSA-WITH-AES-256-CBC-SHA384"},
{"ECDH-RSA-AES256-SHA", "TLS-ECDH-RSA-WITH-AES-256-CBC-SHA"},
{"ECDH-RSA-CAMELLIA128-SHA256", "TLS-ECDH-RSA-WITH-CAMELLIA-128-CBC-SHA256"},
{"ECDH-RSA-CAMELLIA128-SHA", "TLS-ECDH-RSA-WITH-CAMELLIA-128-CBC-SHA"},
{"ECDH-RSA-CAMELLIA256-SHA256", "TLS-ECDH-RSA-WITH-CAMELLIA-256-CBC-SHA256"},
{"ECDH-RSA-CAMELLIA256-SHA", "TLS-ECDH-RSA-WITH-CAMELLIA-256-CBC-SHA"},
{"ECDH-RSA-DES-CBC3-SHA", "TLS-ECDH-RSA-WITH-3DES-EDE-CBC-SHA"},
{"ECDH-RSA-DES-CBC-SHA", "TLS-ECDH-RSA-WITH-DES-CBC-SHA"},
{"ECDH-RSA-RC4-SHA", "TLS-ECDH-RSA-WITH-RC4-128-SHA"},
{"EDH-DSS-DES-CBC3-SHA", "TLS-DHE-DSS-WITH-3DES-EDE-CBC-SHA"},
{"EDH-DSS-DES-CBC-SHA", "TLS-DHE-DSS-WITH-DES-CBC-SHA"},
{"EDH-RSA-DES-CBC3-SHA", "TLS-DHE-RSA-WITH-3DES-EDE-CBC-SHA"},
{"EDH-RSA-DES-CBC-SHA", "TLS-DHE-RSA-WITH-DES-CBC-SHA"},
{"EXP-DES-CBC-SHA", "TLS-RSA-EXPORT-WITH-DES40-CBC-SHA"},
{"EXP-EDH-DSS-DES-CBC-SHA", "TLS-DH-DSS-EXPORT-WITH-DES40-CBC-SHA"},
{"EXP-EDH-RSA-DES-CBC-SHA", "TLS-DH-RSA-EXPORT-WITH-DES40-CBC-SHA"},
{"EXP-RC2-CBC-MD5", "TLS-RSA-EXPORT-WITH-RC2-CBC-40-MD5"},
{"EXP-RC4-MD5", "TLS-RSA-EXPORT-WITH-RC4-40-MD5"},
{"NULL-MD5", "TLS-RSA-WITH-NULL-MD5"},
{"NULL-SHA256", "TLS-RSA-WITH-NULL-SHA256"},
{"NULL-SHA", "TLS-RSA-WITH-NULL-SHA"},
{"PSK-3DES-EDE-CBC-SHA", "TLS-PSK-WITH-3DES-EDE-CBC-SHA"},
{"PSK-AES128-CBC-SHA", "TLS-PSK-WITH-AES-128-CBC-SHA"},
{"PSK-AES256-CBC-SHA", "TLS-PSK-WITH-AES-256-CBC-SHA"},
{"PSK-RC4-SHA", "TLS-PSK-WITH-RC4-128-SHA"},
{"RC4-MD5", "TLS-RSA-WITH-RC4-128-MD5"},
{"RC4-SHA", "TLS-RSA-WITH-RC4-128-SHA"},
{"SEED-SHA", "TLS-RSA-WITH-SEED-CBC-SHA"},
{"SRP-DSS-3DES-EDE-CBC-SHA", "TLS-SRP-SHA-DSS-WITH-3DES-EDE-CBC-SHA"},
{"SRP-DSS-AES-128-CBC-SHA", "TLS-SRP-SHA-DSS-WITH-AES-128-CBC-SHA"},
{"SRP-DSS-AES-256-CBC-SHA", "TLS-SRP-SHA-DSS-WITH-AES-256-CBC-SHA"},
{"SRP-RSA-3DES-EDE-CBC-SHA", "TLS-SRP-SHA-RSA-WITH-3DES-EDE-CBC-SHA"},
{"SRP-RSA-AES-128-CBC-SHA", "TLS-SRP-SHA-RSA-WITH-AES-128-CBC-SHA"},
{"SRP-RSA-AES-256-CBC-SHA", "TLS-SRP-SHA-RSA-WITH-AES-256-CBC-SHA"},
#ifdef ENABLE_CRYPTO_OPENSSL
/* OpenSSL-specific group names */
{"DEFAULT", "DEFAULT"},
{"ALL", "ALL"},
{"HIGH", "HIGH"}, {"!HIGH", "!HIGH"},
{"MEDIUM", "MEDIUM"}, {"!MEDIUM", "!MEDIUM"},
{"LOW", "LOW"}, {"!LOW", "!LOW"},
{"ECDH", "ECDH"}, {"!ECDH", "!ECDH"},
{"ECDSA", "ECDSA"}, {"!ECDSA", "!ECDSA"},
{"EDH", "EDH"}, {"!EDH", "!EDH"},
{"EXP", "EXP"}, {"!EXP", "!EXP"},
{"RSA", "RSA"}, {"!RSA", "!RSA"},
{"kRSA", "kRSA"}, {"!kRSA", "!kRSA"},
{"SRP", "SRP"}, {"!SRP", "!SRP"},
#endif
{NULL, NULL}
};
const tls_cipher_name_pair *
tls_get_cipher_name_pair(const char *cipher_name, size_t len)
{
const tls_cipher_name_pair *pair = tls_cipher_name_translation_table;
while (pair->openssl_name != NULL)
{
if ((strlen(pair->openssl_name) == len && 0 == memcmp(cipher_name, pair->openssl_name, len))
|| (strlen(pair->iana_name) == len && 0 == memcmp(cipher_name, pair->iana_name, len)))
{
return pair;
}
pair++;
}
/* No entry found, return NULL */
return NULL;
}
int
get_num_elements(const char *string, char delimiter)
{
int string_len = strlen(string);
ASSERT(0 != string_len);
int element_count = 1;
/* Get number of ciphers */
for (int i = 0; i < string_len; i++)
{
if (string[i] == delimiter)
{
element_count++;
}
}
return element_count;
}
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