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added a wrapper plugin for OpenSSL crypters (AES, 3DES, Blowfish etc.)

This commit is contained in:
Tobias Brunner 2008-04-28 14:25:19 +00:00
parent 1da06b295f
commit 17353034f3
7 changed files with 460 additions and 0 deletions
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17
configure.in
View File

@ -496,6 +496,16 @@ AC_ARG_ENABLE(
fi],
)
AC_ARG_ENABLE(
[openssl],
AS_HELP_STRING([--enable-openssl],[enables the OpenSSL crypto plugin. (default is NO).]),
[if test x$enableval = xyes; then
openssl=true
else
openssl=false
fi],
)
dnl =========================
dnl check required programs
dnl =========================
@ -597,6 +607,11 @@ if test x$mysql = xtrue; then
AC_CHECK_HEADER([sqlite3.h],,[AC_MSG_ERROR([SQLite header sqlite3.h not found!])])
fi
if test x$openssl = xtrue; then
AC_HAVE_LIBRARY([ssl],[LIBS="$LIBS"],[AC_MSG_ERROR([OpenSSL library ssl not found])])
AC_CHECK_HEADER([openssl/evp.h],,[AC_MSG_ERROR([OpenSSL header openssl/evp.h not found!])])
fi
dnl =========================
dnl set Makefile.am vars
dnl =========================
@ -643,6 +658,7 @@ AM_CONDITIONAL(USE_PLUTO_OR_CHARON, test x$pluto = xtrue -o x$charon = xtrue)
AM_CONDITIONAL(USE_LIBSTRONGSWAN, test x$charon = xtrue -o x$tools = xtrue)
AM_CONDITIONAL(USE_FILE_CONFIG, test x$pluto = xtrue -o x$stroke = xtrue)
AM_CONDITIONAL(USE_PADLOCK, test x$padlock = xtrue)
AM_CONDITIONAL(USE_OPENSSL, test x$openssl = xtrue)
dnl ==============================
dnl set global definitions
@ -676,6 +692,7 @@ AC_OUTPUT(
src/libstrongswan/plugins/mysql/Makefile
src/libstrongswan/plugins/sqlite/Makefile
src/libstrongswan/plugins/padlock/Makefile
src/libstrongswan/plugins/openssl/Makefile
src/libcrypto/Makefile
src/libfreeswan/Makefile
src/pluto/Makefile

4
src/libstrongswan/Makefile.am
View File

@ -144,6 +144,10 @@ if USE_PADLOCK
SUBDIRS += plugins/padlock
endif
if USE_OPENSSL
SUBDIRS += plugins/openssl
endif
if USE_INTEGRITY_TEST
# build fips_signer which in turn builds fips_signature.h
#########################################################

13
src/libstrongswan/plugins/openssl/Makefile.am Normal file
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@ -0,0 +1,13 @@
INCLUDES = -I$(top_srcdir)/src/libstrongswan
AM_CFLAGS = -rdynamic
plugin_LTLIBRARIES = libstrongswan-openssl.la
libstrongswan_openssl_la_SOURCES = openssl_plugin.h openssl_plugin.c \
openssl_crypter.c openssl_crypter.h
libstrongswan_openssl_la_LDFLAGS = -module
libstrongswan_openssl_la_LIBADD = -lssl

250
src/libstrongswan/plugins/openssl/openssl_crypter.c Normal file
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@ -0,0 +1,250 @@
/*
* Copyright (C) 2008 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*
* $Id$
*/
#include "openssl_crypter.h"
#include <openssl/evp.h>
typedef struct private_openssl_crypter_t private_openssl_crypter_t;
/**
* Private data of openssl_crypter_t
*/
struct private_openssl_crypter_t {
/**
* Public part of this class.
*/
openssl_crypter_t public;
/*
* the key
*/
chunk_t key;
/*
* the cipher to use
*/
const EVP_CIPHER *cipher;
};
/**
* Mapping from the algorithms defined in IKEv2 to
* OpenSSL algorithm names and their key length
*/
typedef struct {
/**
* Identifier specified in IKEv2
*/
u_int16_t ikev2_id;
/**
* Name of the algorithm, as used in OpenSSL
*/
char *name;
/**
* Minimum valid key length in bytes
*/
size_t key_size_min;
/**
* Maximum valid key length in bytes
*/
size_t key_size_max;
} openssl_algorithm_t;
#define END_OF_LIST -1
/**
* Algorithms for encryption
*/
static openssl_algorithm_t encryption_algs[] = {
/* {ENCR_DES_IV64, "***", 0, 0}, */
{ENCR_DES, "des", 8, 8}, /* 64 bits */
{ENCR_3DES, "des3", 24, 24}, /* 192 bits */
{ENCR_RC5, "rc5", 5, 255}, /* 40 to 2040 bits, RFC 2451 */
{ENCR_IDEA, "idea", 16, 16}, /* 128 bits, RFC 2451 */
{ENCR_CAST, "cast", 5, 16}, /* 40 to 128 bits, RFC 2451 */
{ENCR_BLOWFISH, "blowfish", 5, 56}, /* 40 to 448 bits, RFC 2451 */
/* {ENCR_3IDEA, "***", 0, 0}, */
/* {ENCR_DES_IV32, "***", 0, 0}, */
/* {ENCR_NULL, "***", 0, 0}, */ /* handled separately */
/* {ENCR_AES_CBC, "***", 0, 0}, */ /* handled separately */
/* {ENCR_AES_CTR, "***", 0, 0}, */ /* disabled in evp.h */
{END_OF_LIST, NULL, 0, 0},
};
/**
* Look up an OpenSSL algorithm name and its key size
*/
static char* lookup_algorithm(openssl_algorithm_t *openssl_algo,
u_int16_t ikev2_algo, size_t key_size)
{
while (openssl_algo->ikev2_id != END_OF_LIST)
{
if (ikev2_algo == openssl_algo->ikev2_id)
{
/* validate key size */
if (key_size < openssl_algo->key_size_min ||
key_size > openssl_algo->key_size_max)
{
return NULL;
}
return openssl_algo->name;
}
openssl_algo++;
}
return NULL;
}
static void crypt(private_openssl_crypter_t *this, chunk_t data,
chunk_t iv, chunk_t *dst, int enc)
{
int len, finlen;
unsigned char buf[data.len + this->cipher->block_size];
EVP_CIPHER_CTX ctx;
EVP_CIPHER_CTX_init(&ctx);
EVP_CipherInit_ex(&ctx, this->cipher, NULL, this->key.ptr, iv.ptr, enc);
EVP_CIPHER_CTX_set_padding(&ctx, 0); /* disable padding */
EVP_CipherUpdate(&ctx, buf, &len, data.ptr, data.len);
EVP_CipherFinal_ex(&ctx, buf + len, &finlen);
len += finlen;
*dst = chunk_alloc(len);
memcpy(dst->ptr, buf, len);
EVP_CIPHER_CTX_cleanup(&ctx);
/* TODO: because we don't use padding, we can simplify this a bit because
* EVP_CryptFinal_ex does not do anything but checking if any data is left.
* so we can work without buffer and fill the dst directly */
}
/**
* Implementation of crypter_t.decrypt.
*/
static void decrypt(private_openssl_crypter_t *this, chunk_t data,
chunk_t iv, chunk_t *dst)
{
crypt(this, data, iv, dst, 0);
}
/**
* Implementation of crypter_t.encrypt.
*/
static void encrypt (private_openssl_crypter_t *this, chunk_t data,
chunk_t iv, chunk_t *dst)
{
crypt(this, data, iv, dst, 1);
}
/**
* Implementation of crypter_t.get_block_size.
*/
static size_t get_block_size(private_openssl_crypter_t *this)
{
return this->cipher->block_size;
}
/**
* Implementation of crypter_t.get_key_size.
*/
static size_t get_key_size(private_openssl_crypter_t *this)
{
return this->key.len;
}
/**
* Implementation of crypter_t.set_key.
*/
static void set_key(private_openssl_crypter_t *this, chunk_t key)
{
memcpy(this->key.ptr, key.ptr, min(key.len, this->key.len));
}
/**
* Implementation of crypter_t.destroy and aes_crypter_t.destroy.
*/
static void destroy (private_openssl_crypter_t *this)
{
free(this->key.ptr);
free(this);
}
/*
* Described in header
*/
openssl_crypter_t *openssl_crypter_create(encryption_algorithm_t algo,
size_t key_size)
{
private_openssl_crypter_t *this;
this = malloc_thing(private_openssl_crypter_t);
switch (algo)
{
case ENCR_NULL:
this->cipher = EVP_enc_null();
break;
case ENCR_AES_CBC:
switch (key_size)
{
case 16: /* AES 128 */
this->cipher = EVP_get_cipherbyname("aes128");
break;
case 24: /* AES-192 */
this->cipher = EVP_get_cipherbyname("aes192");
break;
case 32: /* AES-256 */
this->cipher = EVP_get_cipherbyname("aes256");
break;
default:
free(this);
return NULL;
}
break;
default:
{
char* name = lookup_algorithm(encryption_algs, algo, key_size);
if (!name)
{
/* algo unavailable or key_size invalid */
free(this);
return NULL;
}
this->cipher = EVP_get_cipherbyname(name);
break;
}
}
if (!this->cipher)
{
/* OpenSSL does not support the requested algo */
free(this);
return NULL;
}
this->key = chunk_alloc(key_size);
this->public.crypter_interface.encrypt = (void (*) (crypter_t *, chunk_t,chunk_t, chunk_t *)) encrypt;
this->public.crypter_interface.decrypt = (void (*) (crypter_t *, chunk_t , chunk_t, chunk_t *)) decrypt;
this->public.crypter_interface.get_block_size = (size_t (*) (crypter_t *)) get_block_size;
this->public.crypter_interface.get_key_size = (size_t (*) (crypter_t *)) get_key_size;
this->public.crypter_interface.set_key = (void (*) (crypter_t *,chunk_t)) set_key;
this->public.crypter_interface.destroy = (void (*) (crypter_t *)) destroy;
return &this->public;
}

49
src/libstrongswan/plugins/openssl/openssl_crypter.h Normal file
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@ -0,0 +1,49 @@
/*
* Copyright (C) 2008 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
/**
* @defgroup openssl_crypter openssl_crypter
* @{ @ingroup openssl_p
*/
#ifndef OPENSSL_CRYPTER_H_
#define OPENSSL_CRYPTER_H_
typedef struct openssl_crypter_t openssl_crypter_t;
#include <crypto/crypters/crypter.h>
/**
* Implementation of AES using OpenSSL.
*/
struct openssl_crypter_t {
/**
* The crypter_t interface.
*/
crypter_t crypter_interface;
};
/**
* Constructor to create openssl_crypter_t.
*
* @param algo algorithm to implement, must be ENCR_AES_CBC
* @param key_size key size in bytes
* @return openssl_crypter_t, NULL if not supported
*/
openssl_crypter_t *openssl_crypter_create(encryption_algorithm_t algo,
size_t key_size);
#endif /* OPENSSL_CRYPTER_H_ @}*/

80
src/libstrongswan/plugins/openssl/openssl_plugin.c Normal file
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@ -0,0 +1,80 @@
/*
* Copyright (C) 2008 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*
* $Id$
*/
#include <openssl/evp.h>
#include "openssl_plugin.h"
#include <library.h>
#include "openssl_crypter.h"
typedef struct private_openssl_plugin_t private_openssl_plugin_t;
/**
* private data of openssl_plugin
*/
struct private_openssl_plugin_t {
/**
* public functions
*/
openssl_plugin_t public;
};
/**
* Implementation of openssl_plugin_t.destroy
*/
static void destroy(private_openssl_plugin_t *this)
{
lib->crypto->remove_crypter(lib->crypto,
(crypter_constructor_t)openssl_crypter_create);
EVP_cleanup();
free(this);
}
/*
* see header file
*/
plugin_t *plugin_create()
{
private_openssl_plugin_t *this = malloc_thing(private_openssl_plugin_t);
this->public.plugin.destroy = (void(*)(plugin_t*))destroy;
OpenSSL_add_all_algorithms();
lib->crypto->add_crypter(lib->crypto, ENCR_DES,
(crypter_constructor_t)openssl_crypter_create);
lib->crypto->add_crypter(lib->crypto, ENCR_3DES,
(crypter_constructor_t)openssl_crypter_create);
lib->crypto->add_crypter(lib->crypto, ENCR_RC5,
(crypter_constructor_t)openssl_crypter_create);
lib->crypto->add_crypter(lib->crypto, ENCR_IDEA,
(crypter_constructor_t)openssl_crypter_create);
lib->crypto->add_crypter(lib->crypto, ENCR_CAST,
(crypter_constructor_t)openssl_crypter_create);
lib->crypto->add_crypter(lib->crypto, ENCR_BLOWFISH,
(crypter_constructor_t)openssl_crypter_create);
lib->crypto->add_crypter(lib->crypto, ENCR_NULL,
(crypter_constructor_t)openssl_crypter_create);
lib->crypto->add_crypter(lib->crypto, ENCR_AES_CBC,
(crypter_constructor_t)openssl_crypter_create);
return &this->public.plugin;
}

47
src/libstrongswan/plugins/openssl/openssl_plugin.h Normal file
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@ -0,0 +1,47 @@
/*
* Copyright (C) 2008 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
/**
* @defgroup openssl_p openssl
* @ingroup plugins
*
* @defgroup openssl_plugin openssl_plugin
* @{ @ingroup openssl_p
*/
#ifndef OPENSSL_PLUGIN_H_
#define OPENSSL_PLUGIN_H_
#include <plugins/plugin.h>
typedef struct openssl_plugin_t openssl_plugin_t;
/**
* Plugin implementing crypto functions via the OpenSSL library
*/
struct openssl_plugin_t {
/**
* implements plugin interface
*/
plugin_t plugin;
};
/**
* Create a openssl_plugin instance.
*/
plugin_t *plugin_create();
#endif /* OPENSSL_PLUGIN_H_ @}*/