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// Copyright (C) 2010 David Sugar, Tycho Softworks.
//
// This file is part of GNU uCommon C++.
//
// GNU uCommon C++ is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU uCommon C++ 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with GNU uCommon C++. If not, see <http://www.gnu.org/licenses/>.
#include "local.h"
extern "C" {
#ifndef _MSWINDOWS_
static int gcrypt_mutex_init(void **mp)
{
if(mp)
*mp = new mutex_t();
return 0;
}
static int gcrypt_mutex_destroy(void **mp)
{
if(mp && *mp)
delete (mutex_t *)(*mp);
return 0;
}
static int gcrypt_mutex_lock(void **mp)
{
mutex_t *m = (mutex_t *)(*mp);
m->acquire();
return 0;
}
static int gcrypt_mutex_unlock(void **mp)
{
mutex_t *m = (mutex_t *)(*mp);
m->release();
return 0;
}
static struct gcry_thread_cbs gcrypt_threading = {
GCRY_THREAD_OPTION_PTHREAD, NULL,
gcrypt_mutex_init, gcrypt_mutex_destroy,
gcrypt_mutex_lock, gcrypt_mutex_unlock
};
#endif
static void secure_shutdown(void)
{
gnutls_global_deinit();
}
}
static const char *certid = "generic";
gnutls_priority_t context::priority_cache;
bool secure::fips(const char *progname)
{
return false;
}
bool secure::init(const char *progname)
{
static bool initialized = false;
if(!initialized) {
Thread::init();
if(progname) {
Socket::init(progname);
certid = progname;
}
else
Socket::init();
#ifndef _MSWINDOWS_
gcry_control(GCRYCTL_SET_THREAD_CBS, &gcrypt_threading);
#endif
gnutls_global_init();
gnutls_priority_init (&context::priority_cache, "NORMAL", NULL);
atexit(secure_shutdown);
initialized = true;
}
return true;
}
secure::server_t secure::server(const char *ca)
{
char certfile[256];
char keyfile[256];
context *ctx = new context;
if(!ctx)
return NULL;
ctx->error = secure::OK;
ctx->connect = GNUTLS_SERVER;
ctx->xtype = GNUTLS_CRD_CERTIFICATE;
ctx->xcred = NULL;
ctx->dh = NULL;
gnutls_certificate_allocate_credentials(&ctx->xcred);
snprintf(certfile, sizeof(certfile), "%s/%s.pem", SSL_CERTS, certid);
snprintf(keyfile, sizeof(keyfile), "%s/%s.pem", SSL_PRIVATE, certid);
gnutls_certificate_set_x509_key_file(ctx->xcred, certfile, keyfile, GNUTLS_X509_FMT_PEM);
if(!ca)
return ctx;
if(eq(ca, "*"))
ca = SSL_CERTS;
else if(*ca != '/') {
snprintf(certfile, sizeof(certfile), "%s/%s.pem", SSL_CERTS, ca);
ca = certfile;
}
gnutls_certificate_set_x509_trust_file (ctx->xcred, certfile, GNUTLS_X509_FMT_PEM);
return ctx;
}
String secure::path(path_t id)
{
switch(id) {
case SYSTEM_CERTIFICATES:
return str(SSL_CERTS);
case SYSTEM_KEYS:
return str(SSL_PRIVATE);
}
return str("");
}
#if defined(_MSWINDOWS_)
static void cexport(HCERTSTORE ca, FILE *fp)
{
PCCERT_CONTEXT cert = NULL;
const uint8_t *cp;
char buf[80];
while ((cert = CertEnumCertificatesInStore(ca, cert)) != NULL) {
fprintf(fp, "-----BEGIN CERTIFICATE-----\n");
size_t total = cert->cbCertEncoded;
size_t count;
cp = (const uint8_t *)cert->pbCertEncoded;
while(total) {
count = String::b64encode(buf, cp, total, 64);
if(count)
fprintf(fp, "%s\n", buf);
total -= count;
cp += count;
}
fprintf(fp, "-----END CERTIFICATE-----\n");
}
}
int secure::oscerts(const char *pathname)
{
bool caset;
string_t target = shell::path(shell::USER_CONFIG) + pathname;
FILE *fp = fopen(*target, "wt");
if(!fp)
return ENOSYS;
HCERTSTORE ca = CertOpenSystemStoreA(NULL, "ROOT");
if(ca) {
caset = true;
cexport(ca, fp);
CertCloseStore(ca, 0);
}
ca = CertOpenSystemStoreA(NULL, "CA");
if(ca) {
caset = true;
cexport(ca, fp);
CertCloseStore(ca, 0);
}
fclose(fp);
if(!caset) {
fsys::remove(*target);
return ENOSYS;
}
return 0;
}
#else
int secure::oscerts(const char *pathname)
{
string_t source = path(SYSTEM_CERTIFICATES) + "/ca-certificates.crt";
string_t target = shell::path(shell::USER_CONFIG) + pathname;
if(!*source || !*target)
return ENOSYS;
return fsys::copy(*source, *target);
}
#endif
secure::client_t secure::client(const char *ca)
{
char certfile[256];
context *ctx = new context;
if(!ctx)
return NULL;
ctx->error = secure::OK;
ctx->connect = GNUTLS_CLIENT;
ctx->xtype = GNUTLS_CRD_CERTIFICATE;
ctx->xcred = NULL;
ctx->dh = NULL;
gnutls_certificate_allocate_credentials(&ctx->xcred);
if(!ca)
return ctx;
if(eq(ca, "*"))
ca = SSL_CERTS;
else if(*ca != '/') {
snprintf(certfile, sizeof(certfile), "%s/%s.pem", SSL_CERTS, ca);
ca = certfile;
}
gnutls_certificate_set_x509_trust_file (ctx->xcred, certfile, GNUTLS_X509_FMT_PEM);
return ctx;
}
context::~context()
{
if(dh)
gnutls_dh_params_deinit(dh);
if(!xcred)
return;
switch(xtype) {
case GNUTLS_CRD_ANON:
gnutls_anon_free_client_credentials((gnutls_anon_client_credentials_t)xcred);
break;
case GNUTLS_CRD_CERTIFICATE:
gnutls_certificate_free_credentials(xcred);
break;
default:
break;
}
}
secure::~secure()
{
}
void secure::uuid(char *str)
{
static unsigned char buf[16];
static Timer::tick_t prior = 0l;
static unsigned short seq;
Timer::tick_t current = Timer::ticks();
Mutex::protect(&buf);
// get our (random) node identifier...
if(!prior)
Random::fill(buf + 10, 6);
if(current == prior)
++seq;
else
Random::fill((unsigned char *)&seq, sizeof(seq));
buf[8] = (unsigned char)((seq >> 8) & 0xff);
buf[9] = (unsigned char)(seq & 0xff);
buf[3] = (unsigned char)(current & 0xff);
buf[2] = (unsigned char)((current >> 8) & 0xff);
buf[1] = (unsigned char)((current >> 16) & 0xff);
buf[0] = (unsigned char)((current >> 24) & 0xff);
buf[5] = (unsigned char)((current >> 32) & 0xff);
buf[4] = (unsigned char)((current >> 40) & 0xff);
buf[7] = (unsigned char)((current >> 48) & 0xff);
buf[6] = (unsigned char)((current >> 56) & 0xff);
buf[6] &= 0x0f;
buf[6] |= 0x10;
buf[8] |= 0x80;
String::hexdump(buf, str, "4-2-2-2-6");
Mutex::release(&buf);
}
String secure::uuid(void)
{
char buf[38];
uuid(buf);
return String(buf);
}
gnutls_session_t context::session(context *ctx)
{
SSL ssl = NULL;
if(ctx && ctx->xcred && ctx->err() == secure::OK) {
gnutls_init(&ssl, ctx->connect);
switch(ctx->connect) {
case GNUTLS_CLIENT:
gnutls_priority_set_direct(ssl, "PERFORMANCE", NULL);
break;
case GNUTLS_SERVER:
gnutls_priority_set(ssl, context::priority_cache);
gnutls_certificate_server_set_request(ssl, GNUTLS_CERT_REQUEST);
gnutls_session_enable_compatibility_mode(ssl);
default:
break;
}
gnutls_credentials_set(ssl, ctx->xtype, ctx->xcred);
}
return ssl;
}