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smime.cpp
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smime.cpp
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/*
* Copyright (c) 2022 Novemus Band. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*
*/
#include "utils.h"
#include <openssl/pem.h>
#include <openssl/pkcs7.h>
#include <openssl/err.h>
#include <openssl/x509v3.h>
namespace plexus { namespace utils {
std::string get_last_error()
{
std::string ssl = ERR_error_string(ERR_get_error(), NULL);
std::string sys = strerror(errno);
if (ssl.empty())
return sys;
if (sys.empty())
return ssl;
return ssl + "\n" + sys;
}
std::string smime_sign(const std::string& msg, const std::string& cert, const std::string& key)
{
if (cert.empty() || key.empty())
return msg;
int flags = PKCS7_DETACHED | PKCS7_STREAM | PKCS7_NOCERTS;
std::shared_ptr<BIO> cert_bio(BIO_new_file(cert.c_str(), "r"), BIO_free);
if (!cert_bio)
throw std::runtime_error(get_last_error());
std::shared_ptr<X509> pcert(PEM_read_bio_X509(cert_bio.get(), NULL, 0, NULL), X509_free);
std::shared_ptr<BIO> key_bio(BIO_new_file(key.c_str(), "r"), BIO_free);
if (!key_bio)
throw std::runtime_error(get_last_error());
std::shared_ptr<EVP_PKEY> pkey(PEM_read_bio_PrivateKey(key_bio.get(), NULL, 0, NULL), EVP_PKEY_free);
if (!pcert || !pkey)
throw std::runtime_error(get_last_error());
std::shared_ptr<BIO> in(BIO_new_mem_buf(msg.c_str(), (int)msg.size()), BIO_free);
if (!in)
throw std::runtime_error(get_last_error());
std::shared_ptr<PKCS7> p7(PKCS7_sign(pcert.get(), pkey.get(), NULL, in.get(), flags), PKCS7_free);
if (!p7)
throw std::runtime_error(get_last_error());
std::shared_ptr<BIO> out(BIO_new(BIO_s_mem()), BIO_free);
if (!out)
throw std::runtime_error(get_last_error());
if (!SMIME_write_PKCS7(out.get(), p7.get(), in.get(), flags))
throw std::runtime_error(get_last_error());
char *ptr;
long len = BIO_get_mem_data(out.get(), &ptr);
std::string data(ptr, len);
return std::regex_replace(data, std::regex("\\n"), "\r\n");
}
std::string smime_encrypt(const std::string& msg, const std::string& cert)
{
if (cert.empty())
throw std::runtime_error("no certificate");
int flags = PKCS7_STREAM;
std::shared_ptr<BIO> tbio(BIO_new_file(cert.c_str(), "r"), BIO_free);
if (!tbio)
throw std::runtime_error(get_last_error());
std::shared_ptr<X509> pcert(PEM_read_bio_X509(tbio.get(), NULL, 0, NULL), X509_free);
if (!pcert)
throw std::runtime_error(get_last_error());
STACK_OF(X509) *recips = sk_X509_new_null();
if (!recips || !sk_X509_push(recips, pcert.get()))
throw std::runtime_error(get_last_error());
std::shared_ptr<BIO> in(BIO_new_mem_buf(msg.c_str(), (int)msg.size()), BIO_free);
if (!in)
throw std::runtime_error(get_last_error());
std::shared_ptr<PKCS7> p7(PKCS7_encrypt(recips, in.get(), EVP_des_ede3_cbc(), flags), PKCS7_free);
if (!p7)
throw std::runtime_error(get_last_error());
std::shared_ptr<BIO> out(BIO_new(BIO_s_mem()), BIO_free);
if (!out)
throw std::runtime_error(get_last_error());
if (!SMIME_write_PKCS7(out.get(), p7.get(), in.get(), flags))
throw std::runtime_error(get_last_error());
char *ptr;
long len = BIO_get_mem_data(out.get(), &ptr);
std::string data(ptr, len);
return std::regex_replace(data, std::regex("\\n"), "\r\n");
}
std::string smime_decrypt(const std::string& msg, const std::string& cert, const std::string& key)
{
if (cert.empty())
throw std::runtime_error("no certificate");
if (key.empty())
throw std::runtime_error("no private key");
std::shared_ptr<BIO> cert_bio(BIO_new_file(cert.c_str(), "r"), BIO_free);
if (!cert_bio)
throw std::runtime_error(get_last_error());
std::shared_ptr<X509> pcert(PEM_read_bio_X509(cert_bio.get(), NULL, 0, NULL), X509_free);
std::shared_ptr<BIO> key_bio(BIO_new_file(key.c_str(), "r"), BIO_free);
if (!key_bio)
throw std::runtime_error(get_last_error());
std::shared_ptr<EVP_PKEY> pkey(PEM_read_bio_PrivateKey(key_bio.get(), NULL, 0, NULL), EVP_PKEY_free);
if (!pcert || !pkey)
throw std::runtime_error(get_last_error());
std::string m = std::regex_replace(msg, std::regex("\\r\\n"), "\n");
std::shared_ptr<BIO> in(BIO_new_mem_buf(m.c_str(), (int)m.size()), BIO_free);
if (!in)
throw std::runtime_error(get_last_error());
std::shared_ptr<PKCS7> p7(SMIME_read_PKCS7(in.get(), NULL), PKCS7_free);
if (!p7)
throw std::runtime_error(get_last_error());
std::shared_ptr<BIO> out(BIO_new(BIO_s_mem()), BIO_free);
if (!out)
throw std::runtime_error(get_last_error());
if (!PKCS7_decrypt(p7.get(), pkey.get(), pcert.get(), out.get(), 0))
throw std::runtime_error(get_last_error());
char *ptr;
long len = BIO_get_mem_data(out.get(), &ptr);
std::string data(ptr, len);
return data;
}
std::string smime_verify(const std::string& msg, const std::string& cert, const std::string& ca)
{
if (cert.empty())
return msg;
STACK_OF(X509) *certs = sk_X509_new_null();
if (certs == NULL)
throw std::runtime_error(get_last_error());
std::shared_ptr<BIO> cert_bio(BIO_new_file(cert.c_str(), "r"), BIO_free);
if (!cert_bio)
throw std::runtime_error(get_last_error());
std::shared_ptr<X509> sign_cert(PEM_read_bio_X509(cert_bio.get(), NULL, 0, NULL), X509_free);
if (!sign_cert)
throw std::runtime_error(get_last_error());
sk_X509_push(certs, sign_cert.get());
std::shared_ptr<BIO> ca_bio;
std::shared_ptr<X509> ca_cert;
std::shared_ptr<X509_STORE> st;
if (!ca.empty())
{
ca_bio.reset(BIO_new_file(ca.c_str(), "r"), BIO_free);
if (!ca_bio)
throw std::runtime_error(get_last_error());
ca_cert.reset(PEM_read_bio_X509(ca_bio.get(), NULL, 0, NULL), X509_free);
if (!ca_cert)
throw std::runtime_error(get_last_error());
st.reset(X509_STORE_new(), X509_STORE_free);
if (st == NULL)
throw std::runtime_error(get_last_error());
X509_STORE_set_purpose(st.get(), X509_PURPOSE_ANY);
if (!X509_STORE_add_cert(st.get(), ca_cert.get()))
throw std::runtime_error(get_last_error());
}
std::string m = std::regex_replace(msg, std::regex("\\r\\n"), "\n");
std::shared_ptr<BIO> in(BIO_new_mem_buf(m.c_str(), (int)m.size()), BIO_free);
if (!in)
throw std::runtime_error(get_last_error());
BIO* cont = nullptr;
std::shared_ptr<PKCS7> p7(SMIME_read_PKCS7(in.get(), &cont), PKCS7_free);
if (p7 == NULL)
throw std::runtime_error(get_last_error());
std::shared_ptr<BIO> out(BIO_new(BIO_s_mem()), BIO_free);
if (!out)
throw std::runtime_error(get_last_error());
if (!PKCS7_verify(p7.get(), certs, st.get(), cont, out.get(), st ? 0 : PKCS7_NOVERIFY))
throw std::runtime_error(get_last_error());
char *ptr;
long len = BIO_get_mem_data(out.get(), &ptr);
std::string data(ptr, len);
return data;
}
}}