/usr/include/autobahn/wamp_auth_utils.hpp is in autobahn-cpp-dev 17.5.1+git7cc5d37-2.
This file is owned by root:root, with mode 0o644.
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//
// Copyright (c) Crossbar.io Technologies GmbH and contributors
//
// Boost Software License - Version 1.0 - August 17th, 2003
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef WAMP_AUTH_UTILS_HPP
#define WAMP_AUTH_UTILS_HPP
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <exception>
//
// Execpetion thrown when something gets wrong
// creating the derived auth key.....
//
class derived_key_error : public std::exception
{
virtual const char* what() const throw()
{
return "Error occured when calulcate a derived key";
}
};
//////////////////////////////////////////////////////
// - using openssl crypto lib
// see openssl at : https://www.openssl.org
//////////////////////////////////////////////////////
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/bio.h>
#include <openssl/buffer.h>
#include <stdint.h>
/*!
* base64 encoding
*
* \param data The data to be encoded
* \return A encoded string
*/
inline std::string base_64_encode(const std::string & data )
{
BIO *bio, *b64;
BUF_MEM *pBuf;
b64 = BIO_new(BIO_f_base64());
bio = BIO_new(BIO_s_mem());
bio = BIO_push(b64, bio);
BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL);
BIO_write(bio, (const unsigned char *) data.c_str(), data.size());
(void)BIO_flush(bio);
BIO_get_mem_ptr(bio, &pBuf);
(void)BIO_set_close(bio, BIO_NOCLOSE);
std::string str_out;
str_out.assign( pBuf->data, pBuf->length );
BIO_free_all(bio);
return str_out;
}
/*!
* create a derived key from a password/secret
*
* \param passwd A secret string to make a derived key for
* \param salt A random salt added to the key
* \param iterations A number of intertions used to create the derived key
* \param keylen The length of the derived key returned.
* \return a PBKDF2-sha256 derived key
*/
inline std::string derive_key(
const std::string & passwd,
const std::string & salt,
int iterations,
int keylen
)
{
int passwdLen = passwd.size();
const char * pwd = passwd.c_str();
int saltLen = salt.size();
unsigned char * salt_value = (unsigned char * ) salt.c_str();
std::string str_out;
str_out.resize( keylen );
unsigned char * out = (unsigned char *) str_out.c_str();
int result = PKCS5_PBKDF2_HMAC(
pwd, passwdLen,
salt_value, saltLen,
iterations,
EVP_sha256(),
keylen, out);
if ( result != 0 )
{
return base_64_encode( str_out );
}
else
{
throw derived_key_error();
}
}
/*!
* make a keyed-hash from a key using the HMAC-sha256 and a challenge
*
* \param key The key to make a digest for
* \param challenge Some data mixin - identify the specific digest
* \return a base64 encoded digest
*/
inline std::string compute_wcs(
const std::string & key,
const std::string & challenge )
{
unsigned int len = 32;
unsigned char hash[32];
#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
HMAC_CTX hmac;
HMAC_CTX_init(&hmac);
HMAC_Init_ex(&hmac, key.data(), key.length(), EVP_sha256(), NULL);
HMAC_Update(&hmac, (unsigned char*) challenge.data(), challenge.length());
HMAC_Final(&hmac, hash, &len);
HMAC_CTX_cleanup(&hmac);
#else
HMAC_CTX *hmac = HMAC_CTX_new();
if (!hmac)
return "";
HMAC_Init_ex(hmac, key.data(), key.length(), EVP_sha256(), NULL);
HMAC_Update(hmac, ( unsigned char* ) challenge.data(), challenge.length());
HMAC_Final(hmac, hash, &len);
HMAC_CTX_free(hmac);
#endif
std::string str_out;
str_out.assign( ( char * ) &hash , 32 );
return base_64_encode( str_out );
}
/*!
* Generates a new random secret for use with WAMP-CRA.
* The secret generated is a random character sequence drawn from
*
* - upper and lower case latin letters
* - digits
* -
*
* \param length The length of the secret to generate.
* \param challenge Some data mixin - identify the specific digest
* \return The generated secret. The length of the generated is ``length`` octets.
*/
inline std::string generate_wcs(int length=14){
//
// The characters from which to generate the secret.
//
static const char WCS_SECRET_CHARSET[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
std::string s;
for (int i = 0; i < length; ++i) {
s.push_back( WCS_SECRET_CHARSET[ rand() % (sizeof(WCS_SECRET_CHARSET) - 1) ] );
}
return s;
}
#endif //WAMP_AUTH_UTILS_HPP
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