main.c
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/*
* "Software PW3270, desenvolvido com base nos códigos fontes do WC3270 e X3270
* (Paul Mattes Paul.Mattes@usa.net), de emulação de terminal 3270 para acesso a
* aplicativos mainframe. Registro no INPI sob o nome G3270.
*
* Copyright (C) <2008> <Banco do Brasil S.A.>
*
* Este programa é software livre. Você pode redistribuí-lo e/ou modificá-lo sob
* os termos da GPL v.2 - Licença Pública Geral ', conforme publicado pela
* Free Software Foundation.
*
* Este programa é distribuído na expectativa de ser útil, mas SEM QUALQUER
* GARANTIA; sem mesmo a garantia implícita de COMERCIALIZAÇÃO ou de ADEQUAÇÃO
* A QUALQUER PROPÓSITO EM PARTICULAR. Consulte a Licença Pública Geral GNU para
* obter mais detalhes.
*
* Você deve ter recebido uma cópia da Licença Pública Geral GNU junto com este
* programa; se não, escreva para a Free Software Foundation, Inc., 51 Franklin
* St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Este programa está nomeado como openssl.c e possui - linhas de código.
*
* Contatos:
*
* perry.werneck@gmail.com (Alexandre Perry de Souza Werneck)
* erico.mendonca@gmail.com (Erico Mascarenhas de Mendonça)
*
*/
/**
* @brief OpenSSL based networking methods.
*
*/
#include "private.h"
#include <openssl/asn1.h>
static void openssl_network_reset(H3270 *hSession) {
if(hSession->network.context) {
lib3270_openssl_crl_free(hSession->network.context);
}
}
static void openssl_network_finalize(H3270 *hSession) {
debug("%s",__FUNCTION__);
openssl_network_reset(hSession);
if(hSession->network.context) {
lib3270_free(hSession->network.context);
hSession->network.context = NULL;
}
}
static int openssl_network_disconnect(H3270 *hSession) {
LIB3270_NET_CONTEXT * context = hSession->network.context;
debug("%s",__FUNCTION__);
if(context->con) {
SSL_shutdown(context->con);
SSL_free(context->con);
context->con = NULL;
}
if(context->sock > 0) {
shutdown(context->sock, 2);
#ifdef _WIN32
closesocket(context->sock);
#else
close(context->sock);
#endif // _WIN32
context->sock = -1;
}
return 0;
}
ssize_t openssl_network_send(H3270 *hSession, const void *buffer, size_t length) {
int rc = SSL_write(hSession->network.context->con, (const char *) buffer, length);
if(rc > 0)
return rc;
// https://www.openssl.org/docs/man1.0.2/man3/SSL_get_error.html
int ssl_error = SSL_get_error(hSession->network.context->con, rc);
switch(ssl_error) {
case SSL_ERROR_ZERO_RETURN:
trace_ssl(hSession,"%s","The secure connection has been closed cleanly");
lib3270_set_network_error(
hSession,
_("Disconnected from host."),
"%s",
_("The secure connection has been closed cleanly.")
);
return 0;
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_X509_LOOKUP:
return -EWOULDBLOCK; // Force a new loop.
case SSL_ERROR_SYSCALL:
return lib3270_socket_send_failed(hSession);
}
// Build error message.
char err_buf[120];
(void) ERR_error_string(ssl_error, err_buf);
trace_dsn(hSession,"RCVD SSL_write error %d (%s)\n", ssl_error, err_buf);
lib3270_set_network_error(
hSession,
_("Error writing to host."),
_("The SSL error message was %s"),
err_buf
);
return -1;
}
static ssize_t openssl_network_recv(H3270 *hSession, void *buf, size_t len) {
int rc = SSL_read(hSession->network.context->con, (char *) buf, len);
if(rc > 0) {
return rc;
}
// https://www.openssl.org/docs/man1.0.2/man3/SSL_get_error.html
int ssl_error = SSL_get_error(hSession->network.context->con, rc);
switch(ssl_error) {
case SSL_ERROR_ZERO_RETURN:
trace_ssl(hSession,"%s","The secure connection has been closed cleanly");
lib3270_set_network_error(
hSession,
_("Disconnected from host."),
"%s",
_("The secure connection has been closed cleanly.")
);
return 0;
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_X509_LOOKUP:
return -EWOULDBLOCK; // Force a new loop.
case SSL_ERROR_SYSCALL:
return lib3270_socket_recv_failed(hSession);
}
// Build error message.
char err_buf[120];
(void) ERR_error_string(ssl_error, err_buf);
trace_dsn(hSession,"RCVD SSL_read error %d (%s)\n", ssl_error, err_buf);
lib3270_set_network_error(
hSession,
_("Error reading from host"),
_("The SSL error message was %s"),
err_buf
);
return -1;
}
static int openssl_network_getsockname(const H3270 *hSession, struct sockaddr *addr, socklen_t *addrlen) {
return getsockname(hSession->network.context->sock, addr, addrlen);
}
static int openssl_network_getpeername(const H3270 *hSession, struct sockaddr *addr, socklen_t *addrlen) {
return getpeername(hSession->network.context->sock, addr, addrlen);
}
static void * openssl_network_add_poll(H3270 *hSession, LIB3270_IO_FLAG flag, void(*call)(H3270 *, int, LIB3270_IO_FLAG, void *), void *userdata) {
return lib3270_add_poll_fd(hSession,hSession->network.context->sock,flag,call,userdata);
}
static int openssl_network_non_blocking(H3270 *hSession, const unsigned char on) {
return lib3270_socket_set_non_blocking(hSession, hSession->network.context->sock, on);
}
static int openssl_network_is_connected(const H3270 *hSession) {
debug("%s: %s",__FUNCTION__, (hSession->network.context->sock > 0 ? "True" : "False"))
return hSession->network.context->sock > 0;
}
static int openssl_network_setsockopt(H3270 *hSession, int level, int optname, const void *optval, size_t optlen) {
debug("%s(%d)",__FUNCTION__,hSession->network.context->sock);
return setsockopt(hSession->network.context->sock, level, optname, optval, optlen);
}
static int openssl_network_getsockopt(H3270 *hSession, int level, int optname, void *optval, socklen_t *optlen) {
debug("%s(%d)",__FUNCTION__,hSession->network.context->sock);
return getsockopt(hSession->network.context->sock, level, optname, optval, optlen);
}
static char * openssl_network_getcert(const H3270 *hSession) {
LIB3270_NET_CONTEXT * context = hSession->network.context;
if(context && context->con) {
lib3270_autoptr(X509) peer = SSL_get_peer_certificate(context->con);
if(peer) {
lib3270_autoptr(BIO) out = BIO_new(BIO_s_mem());
unsigned char * data;
unsigned char * text;
int n;
X509_print(out,peer);
n = BIO_get_mem_data(out, &data);
text = (unsigned char *) lib3270_malloc(n+1);
memcpy(text,data,n);
text[n] ='\0';
return (char *) text;
}
}
errno = ENOTCONN;
return NULL;
}
static char * openssl_network_getcrl(const H3270 *hSession) {
LIB3270_NET_CONTEXT * context = hSession->network.context;
if(context->crl.cert) {
lib3270_autoptr(BIO) out = BIO_new(BIO_s_mem());
unsigned char * data;
unsigned char * text;
int n;
X509_CRL_print(out,context->crl.cert);
n = BIO_get_mem_data(out, &data);
text = (unsigned char *) lib3270_malloc(n+1);
memcpy(text,data,n);
text[n] ='\0';
return (char *) text;
}
errno = ENOENT;
return NULL;
}
static int openssl_network_init(H3270 *hSession) {
debug("%s",__FUNCTION__);
set_ssl_state(hSession,LIB3270_SSL_UNDEFINED);
SSL_CTX * ctx_context = (SSL_CTX *) lib3270_openssl_get_context(hSession);
if(!ctx_context)
return -1;
return 0;
}
static int openssl_network_connect(H3270 *hSession, LIB3270_NETWORK_STATE *state) {
debug("%s",__FUNCTION__);
LIB3270_NET_CONTEXT * context = hSession->network.context;
if(context->crl.cert) {
// Has CRL, release if expired.
// https://stackoverflow.com/questions/23407376/testing-x509-certificate-expiry-date-with-c
// X509_CRL_get_nextUpdate is deprecated in openssl 1.1.0
#if OPENSSL_VERSION_NUMBER < 0x10100000L
const ASN1_TIME * next_update = X509_CRL_get_nextUpdate(context->crl.cert);
#else
const ASN1_TIME * next_update = X509_CRL_get0_nextUpdate(context->crl.cert);
#endif
if(X509_cmp_current_time(next_update) == 1) {
trace_ssl(hSession,"CRL is valid\n");
/*
int day, sec;
if(ASN1_TIME_diff(&day, &sec, NULL, next_update)) {
trace_ssl(hSession,"CRL is valid for %d day(s) and %d second(s)\n",day,sec);
} else {
trace_ssl(hSession,"Can't get CRL next update, discarding it\n");
lib3270_openssl_crl_free(context);
}
*/
} else {
trace_ssl(hSession,"CRL is no longer valid\n");
lib3270_openssl_crl_free(context);
}
}
//
// Enable SSL & Connect to host.
//
set_ssl_state(hSession,LIB3270_SSL_UNDEFINED);
hSession->ssl.host = 1;
context->sock = lib3270_network_connect(hSession, state);
debug("%s: sock=%d",__FUNCTION__,context->sock);
return (context->sock < 0 ? -1 : 0);
}
void lib3270_set_libssl_network_module(H3270 *hSession) {
static const LIB3270_NET_MODULE module = {
.name = "tn3270s",
.service = "tn3270s",
.init = openssl_network_init,
.finalize = openssl_network_finalize,
.connect = openssl_network_connect,
.disconnect = openssl_network_disconnect,
.start_tls = openssl_network_start_tls,
.send = openssl_network_send,
.recv = openssl_network_recv,
.add_poll = openssl_network_add_poll,
.non_blocking = openssl_network_non_blocking,
.is_connected = openssl_network_is_connected,
.getsockname = openssl_network_getsockname,
.getpeername = openssl_network_getpeername,
.setsockopt = openssl_network_setsockopt,
.getsockopt = openssl_network_getsockopt,
.getcert = openssl_network_getcert,
.getcrl = openssl_network_getcrl,
.reset = openssl_network_reset
};
if(hSession->network.module == &module) {
debug("%s - Network module is already set",__FUNCTION__);
return;
}
debug("%s - Setting network module",__FUNCTION__);
if(hSession->network.context) {
// Has context, finalize it.
hSession->network.module->finalize(hSession);
}
hSession->ssl.host = 1;
hSession->network.context = lib3270_malloc(sizeof(LIB3270_NET_CONTEXT));
memset(hSession->network.context,0,sizeof(LIB3270_NET_CONTEXT));
hSession->network.context->sock = -1;
hSession->network.module = &module;
}
int lib3270_activate_ssl_network_module(H3270 *hSession, int sock) {
lib3270_set_libssl_network_module(hSession);
int rc = openssl_network_init(hSession);
hSession->network.context->sock = sock;
return rc;
}
void lib3270_openssl_crl_free(LIB3270_NET_CONTEXT *context) {
if(context->crl.cert) {
X509_CRL_free(context->crl.cert);
context->crl.cert = NULL;
}
}