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/*****************************************************************************
$Id$
File: ssl.cpp
Date: 30Apr06
Copyright (C) 2006-07 by Francis Cianfrocca. All Rights Reserved.
Gmail: blackhedd
This program is free software; you can redistribute it and/or modify
it under the terms of either: 1) 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; or 2) Ruby's License.
See the file COPYING for complete licensing information.
*****************************************************************************/
#ifdef WITH_SSL
#include "project.h"
bool SslContext_t::bLibraryInitialized = false;
static void InitializeDefaultCredentials();
static EVP_PKEY *DefaultPrivateKey = NULL;
static X509 *DefaultCertificate = NULL;
static char PrivateMaterials[] = {
"-----BEGIN RSA PRIVATE KEY-----\n"
"MIICXAIBAAKBgQDCYYhcw6cGRbhBVShKmbWm7UVsEoBnUf0cCh8AX+MKhMxwVDWV\n"
"Igdskntn3cSJjRtmgVJHIK0lpb/FYHQB93Ohpd9/Z18pDmovfFF9nDbFF0t39hJ/\n"
"AqSzFB3GiVPoFFZJEE1vJqh+3jzsSF5K56bZ6azz38VlZgXeSozNW5bXkQIDAQAB\n"
"AoGALA89gIFcr6BIBo8N5fL3aNHpZXjAICtGav+kTUpuxSiaym9cAeTHuAVv8Xgk\n"
"H2Wbq11uz+6JMLpkQJH/WZ7EV59DPOicXrp0Imr73F3EXBfR7t2EQDYHPMthOA1D\n"
"I9EtCzvV608Ze90hiJ7E3guGrGppZfJ+eUWCPgy8CZH1vRECQQDv67rwV/oU1aDo\n"
"6/+d5nqjeW6mWkGqTnUU96jXap8EIw6B+0cUKskwx6mHJv+tEMM2748ZY7b0yBlg\n"
"w4KDghbFAkEAz2h8PjSJG55LwqmXih1RONSgdN9hjB12LwXL1CaDh7/lkEhq0PlK\n"
"PCAUwQSdM17Sl0Xxm2CZiekTSlwmHrtqXQJAF3+8QJwtV2sRJp8u2zVe37IeH1cJ\n"
"xXeHyjTzqZ2803fnjN2iuZvzNr7noOA1/Kp+pFvUZUU5/0G2Ep8zolPUjQJAFA7k\n"
"xRdLkzIx3XeNQjwnmLlncyYPRv+qaE3FMpUu7zftuZBnVCJnvXzUxP3vPgKTlzGa\n"
"dg5XivDRfsV+okY5uQJBAMV4FesUuLQVEKb6lMs7rzZwpeGQhFDRfywJzfom2TLn\n"
"2RdJQQ3dcgnhdVDgt5o1qkmsqQh8uJrJ9SdyLIaZQIc=\n"
"-----END RSA PRIVATE KEY-----\n"
"-----BEGIN CERTIFICATE-----\n"
"MIID6TCCA1KgAwIBAgIJANm4W/Tzs+s+MA0GCSqGSIb3DQEBBQUAMIGqMQswCQYD\n"
"VQQGEwJVUzERMA8GA1UECBMITmV3IFlvcmsxETAPBgNVBAcTCE5ldyBZb3JrMRYw\n"
"FAYDVQQKEw1TdGVhbWhlYXQubmV0MRQwEgYDVQQLEwtFbmdpbmVlcmluZzEdMBsG\n"
"A1UEAxMUb3BlbmNhLnN0ZWFtaGVhdC5uZXQxKDAmBgkqhkiG9w0BCQEWGWVuZ2lu\n"
"ZWVyaW5nQHN0ZWFtaGVhdC5uZXQwHhcNMDYwNTA1MTcwNjAzWhcNMjQwMjIwMTcw\n"
"NjAzWjCBqjELMAkGA1UEBhMCVVMxETAPBgNVBAgTCE5ldyBZb3JrMREwDwYDVQQH\n"
"EwhOZXcgWW9yazEWMBQGA1UEChMNU3RlYW1oZWF0Lm5ldDEUMBIGA1UECxMLRW5n\n"
"aW5lZXJpbmcxHTAbBgNVBAMTFG9wZW5jYS5zdGVhbWhlYXQubmV0MSgwJgYJKoZI\n"
"hvcNAQkBFhllbmdpbmVlcmluZ0BzdGVhbWhlYXQubmV0MIGfMA0GCSqGSIb3DQEB\n"
"AQUAA4GNADCBiQKBgQDCYYhcw6cGRbhBVShKmbWm7UVsEoBnUf0cCh8AX+MKhMxw\n"
"VDWVIgdskntn3cSJjRtmgVJHIK0lpb/FYHQB93Ohpd9/Z18pDmovfFF9nDbFF0t3\n"
"9hJ/AqSzFB3GiVPoFFZJEE1vJqh+3jzsSF5K56bZ6azz38VlZgXeSozNW5bXkQID\n"
"AQABo4IBEzCCAQ8wHQYDVR0OBBYEFPJvPd1Fcmd8o/Tm88r+NjYPICCkMIHfBgNV\n"
"HSMEgdcwgdSAFPJvPd1Fcmd8o/Tm88r+NjYPICCkoYGwpIGtMIGqMQswCQYDVQQG\n"
"EwJVUzERMA8GA1UECBMITmV3IFlvcmsxETAPBgNVBAcTCE5ldyBZb3JrMRYwFAYD\n"
"VQQKEw1TdGVhbWhlYXQubmV0MRQwEgYDVQQLEwtFbmdpbmVlcmluZzEdMBsGA1UE\n"
"AxMUb3BlbmNhLnN0ZWFtaGVhdC5uZXQxKDAmBgkqhkiG9w0BCQEWGWVuZ2luZWVy\n"
"aW5nQHN0ZWFtaGVhdC5uZXSCCQDZuFv087PrPjAMBgNVHRMEBTADAQH/MA0GCSqG\n"
"SIb3DQEBBQUAA4GBAC1CXey/4UoLgJiwcEMDxOvW74plks23090iziFIlGgcIhk0\n"
"Df6hTAs7H3MWww62ddvR8l07AWfSzSP5L6mDsbvq7EmQsmPODwb6C+i2aF3EDL8j\n"
"uw73m4YIGI0Zw2XdBpiOGkx2H56Kya6mJJe/5XORZedh1wpI7zki01tHYbcy\n"
"-----END CERTIFICATE-----\n"};
/* These private materials were made with:
* openssl req -new -x509 -keyout cakey.pem -out cacert.pem -nodes -days 6500
* TODO: We need a full-blown capability to work with user-supplied
* keypairs and properly-signed certificates.
*/
/*****************
builtin_passwd_cb
*****************/
extern "C" int builtin_passwd_cb (char *buf, int bufsize, int rwflag, void *userdata)
{
strcpy (buf, "kittycat");
return 8;
}
/****************************
InitializeDefaultCredentials
****************************/
static void InitializeDefaultCredentials()
{
BIO *bio = BIO_new_mem_buf (PrivateMaterials, -1);
assert (bio);
if (DefaultPrivateKey) {
// we may come here in a restart.
EVP_PKEY_free (DefaultPrivateKey);
DefaultPrivateKey = NULL;
}
PEM_read_bio_PrivateKey (bio, &DefaultPrivateKey, builtin_passwd_cb, 0);
if (DefaultCertificate) {
// we may come here in a restart.
X509_free (DefaultCertificate);
DefaultCertificate = NULL;
}
PEM_read_bio_X509 (bio, &DefaultCertificate, NULL, 0);
BIO_free (bio);
}
/**************************
SslContext_t::SslContext_t
**************************/
SslContext_t::SslContext_t (bool is_server, const string &privkeyfile, const string &certchainfile, int ssl_version, const string &cipherlist):
pCtx (NULL),
PrivateKey (NULL),
Certificate (NULL)
{
/* TODO: the usage of the specified private-key and cert-chain filenames only applies to
* client-side connections at this point. Server connections currently use the default materials.
* That needs to be fixed asap.
* Also, in this implementation, server-side connections use statically defined X-509 defaults.
* One thing I'm really not clear on is whether or not you have to explicitly free X509 and EVP_PKEY
* objects when we call our destructor, or whether just calling SSL_CTX_free is enough.
*/
if (!bLibraryInitialized) {
bLibraryInitialized = true;
SSL_library_init();
OpenSSL_add_ssl_algorithms();
OpenSSL_add_all_algorithms();
SSL_load_error_strings();
ERR_load_crypto_strings();
InitializeDefaultCredentials();
}
bIsServer = is_server;
switch(ssl_version) {
/* SSLv23 */
case 0:
pCtx = SSL_CTX_new (is_server ? SSLv23_server_method() : SSLv23_client_method());
break;
/* SSLv3 */
case 1:
pCtx = SSL_CTX_new (is_server ? SSLv3_server_method() : SSLv3_client_method());
break;
/* TLSv1 */
case 2:
pCtx = SSL_CTX_new (is_server ? TLSv1_server_method() : TLSv1_client_method());
break;
};
if (!pCtx)
throw std::runtime_error ("no SSL context");
SSL_CTX_set_options (pCtx, SSL_OP_ALL);
//SSL_CTX_set_options (pCtx, (SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3));
#ifdef SSL_MODE_RELEASE_BUFFERS
SSL_CTX_set_mode (pCtx, SSL_MODE_RELEASE_BUFFERS);
#endif
if (is_server) {
// The SSL_CTX calls here do NOT allocate memory.
int e;
if (privkeyfile.length() > 0)
e = SSL_CTX_use_PrivateKey_file (pCtx, privkeyfile.c_str(), SSL_FILETYPE_PEM);
else
e = SSL_CTX_use_PrivateKey (pCtx, DefaultPrivateKey);
if (e <= 0) ERR_print_errors_fp(stderr);
assert (e > 0);
if (certchainfile.length() > 0)
e = SSL_CTX_use_certificate_chain_file (pCtx, certchainfile.c_str());
else
e = SSL_CTX_use_certificate (pCtx, DefaultCertificate);
if (e <= 0) ERR_print_errors_fp(stderr);
assert (e > 0);
}
if (cipherlist.length() > 0)
SSL_CTX_set_cipher_list (pCtx, cipherlist.c_str());
else
SSL_CTX_set_cipher_list (pCtx, "ALL:!ADH:!LOW:!EXP:!DES-CBC3-SHA:@STRENGTH");
if (is_server) {
SSL_CTX_sess_set_cache_size (pCtx, 128);
SSL_CTX_set_session_id_context (pCtx, (unsigned char*)"eventmachine", 12);
}
else {
int e;
if (privkeyfile.length() > 0) {
e = SSL_CTX_use_PrivateKey_file (pCtx, privkeyfile.c_str(), SSL_FILETYPE_PEM);
if (e <= 0) ERR_print_errors_fp(stderr);
assert (e > 0);
}
if (certchainfile.length() > 0) {
e = SSL_CTX_use_certificate_chain_file (pCtx, certchainfile.c_str());
if (e <= 0) ERR_print_errors_fp(stderr);
assert (e > 0);
}
}
}
/***************************
SslContext_t::~SslContext_t
***************************/
SslContext_t::~SslContext_t()
{
if (pCtx)
SSL_CTX_free (pCtx);
if (PrivateKey)
EVP_PKEY_free (PrivateKey);
if (Certificate)
X509_free (Certificate);
}
/******************
SslBox_t::SslBox_t
******************/
SslBox_t::SslBox_t (bool is_server, const string &privkeyfile, const string &certchainfile, bool verify_peer, int ssl_version, const string &cipherlist, const unsigned long binding):
bIsServer (is_server),
bHandshakeCompleted (false),
bVerifyPeer (verify_peer),
bSslVersion (ssl_version),
pSSL (NULL),
pbioRead (NULL),
pbioWrite (NULL)
{
/* TODO someday: make it possible to re-use SSL contexts so we don't have to create
* a new one every time we come here.
*/
Context = new SslContext_t (bIsServer, privkeyfile, certchainfile, ssl_version, cipherlist);
assert (Context);
pbioRead = BIO_new (BIO_s_mem());
assert (pbioRead);
pbioWrite = BIO_new (BIO_s_mem());
assert (pbioWrite);
pSSL = SSL_new (Context->pCtx);
assert (pSSL);
SSL_set_bio (pSSL, pbioRead, pbioWrite);
// Store a pointer to the binding signature in the SSL object so we can retrieve it later
SSL_set_ex_data(pSSL, 0, (void*) binding);
if (bVerifyPeer)
SSL_set_verify(pSSL, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, ssl_verify_wrapper);
if (!bIsServer)
SSL_connect (pSSL);
}
/*******************
SslBox_t::~SslBox_t
*******************/
SslBox_t::~SslBox_t()
{
// Freeing pSSL will also free the associated BIOs, so DON'T free them separately.
if (pSSL) {
if (SSL_get_shutdown (pSSL) & SSL_RECEIVED_SHUTDOWN)
SSL_shutdown (pSSL);
else
SSL_clear (pSSL);
SSL_free (pSSL);
}
delete Context;
}
/***********************
SslBox_t::PutCiphertext
***********************/
bool SslBox_t::PutCiphertext (const char *buf, int bufsize)
{
assert (buf && (bufsize > 0));
assert (pbioRead);
int n = BIO_write (pbioRead, buf, bufsize);
return (n == bufsize) ? true : false;
}
/**********************
SslBox_t::GetPlaintext
**********************/
int SslBox_t::GetPlaintext (char *buf, int bufsize)
{
if (!SSL_is_init_finished (pSSL)) {
int e = bIsServer ? SSL_accept (pSSL) : SSL_connect (pSSL);
if (e != 1) {
int er = SSL_get_error (pSSL, e);
if (er != SSL_ERROR_WANT_READ) {
// Return -1 for a nonfatal error, -2 for an error that should force the connection down.
return (er == SSL_ERROR_SSL) ? (-2) : (-1);
}
else
return 0;
}
bHandshakeCompleted = true;
// If handshake finished, FALL THROUGH and return the available plaintext.
}
if (!SSL_is_init_finished (pSSL)) {
// We can get here if a browser abandons a handshake.
// The user can see a warning dialog and abort the connection.
//cerr << "<SSL_incomp>";
return 0;
}
//cerr << "CIPH: " << SSL_get_cipher (pSSL) << endl;
int n = SSL_read (pSSL, buf, bufsize);
if (n >= 0) {
return n;
}
else {
if (SSL_get_error (pSSL, n) == SSL_ERROR_WANT_READ) {
return 0;
}
else {
return -1;
}
}
return 0;
}
/**************************
SslBox_t::CanGetCiphertext
**************************/
bool SslBox_t::CanGetCiphertext()
{
assert (pbioWrite);
return BIO_pending (pbioWrite) ? true : false;
}
/***********************
SslBox_t::GetCiphertext
***********************/
int SslBox_t::GetCiphertext (char *buf, int bufsize)
{
assert (pbioWrite);
assert (buf && (bufsize > 0));
return BIO_read (pbioWrite, buf, bufsize);
}
/**********************
SslBox_t::PutPlaintext
**********************/
int SslBox_t::PutPlaintext (const char *buf, int bufsize)
{
// The caller will interpret the return value as the number of bytes written.
// WARNING WARNING WARNING, are there any situations in which a 0 or -1 return
// from SSL_write means we should immediately retry? The socket-machine loop
// will probably wait for a time-out cycle (perhaps a second) before re-trying.
// THIS WOULD CAUSE A PERCEPTIBLE DELAY!
/* We internally queue any outbound plaintext that can't be dispatched
* because we're in the middle of a handshake or something.
* When we get called, try to send any queued data first, and then
* send the caller's data (or queue it). We may get called with no outbound
* data, which means we try to send the outbound queue and that's all.
*
* Return >0 if we wrote any data, 0 if we didn't, and <0 for a fatal error.
* Note that if we return 0, the connection is still considered live
* and we are signalling that we have accepted the outbound data (if any).
*/
OutboundQ.Push (buf, bufsize);
if (!SSL_is_init_finished (pSSL))
return 0;
bool fatal = false;
bool did_work = false;
while (OutboundQ.HasPages()) {
const char *page;
int length;
OutboundQ.Front (&page, &length);
assert (page && (length > 0));
int n = SSL_write (pSSL, page, length);
if (n > 0) {
did_work = true;
OutboundQ.PopFront();
}
else {
int er = SSL_get_error (pSSL, n);
if ((er != SSL_ERROR_WANT_READ) && (er != SSL_ERROR_WANT_WRITE))
fatal = true;
break;
}
}
if (did_work)
return 1;
else if (fatal)
return -1;
else
return 0;
}
/**********************
SslBox_t::GetPeerCert
**********************/
X509 *SslBox_t::GetPeerCert()
{
X509 *cert = NULL;
if (pSSL)
cert = SSL_get_peer_certificate(pSSL);
return cert;
}
/******************
ssl_verify_wrapper
*******************/
extern "C" int ssl_verify_wrapper(int preverify_ok, X509_STORE_CTX *ctx)
{
unsigned long binding;
X509 *cert;
SSL *ssl;
BUF_MEM *buf;
BIO *out;
int result;
cert = X509_STORE_CTX_get_current_cert(ctx);
ssl = (SSL*) X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
binding = (unsigned long) SSL_get_ex_data(ssl, 0);
out = BIO_new(BIO_s_mem());
PEM_write_bio_X509(out, cert);
BIO_write(out, "\0", 1);
BIO_get_mem_ptr(out, &buf);
ConnectionDescriptor *cd = dynamic_cast <ConnectionDescriptor*> (Bindable_t::GetObject(binding));
result = (cd->VerifySslPeer(buf->data) == true ? 1 : 0);
BIO_free(out);
return result;
}
#endif // WITH_SSL
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