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287 lines
7.4 KiB
287 lines
7.4 KiB
/*
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* rfbssl_gnutls.c - Secure socket funtions (gnutls version)
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*/
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/*
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* Copyright (C) 2011 Gernot Tenchio
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#include "rfbssl.h"
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#include <gnutls/gnutls.h>
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#include <errno.h>
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struct rfbssl_ctx {
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char peekbuf[2048];
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int peeklen;
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int peekstart;
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gnutls_session_t session;
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gnutls_certificate_credentials_t x509_cred;
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gnutls_dh_params_t dh_params;
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#ifdef I_LIKE_RSA_PARAMS_THAT_MUCH
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gnutls_rsa_params_t rsa_params;
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#endif
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};
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void rfbssl_log_func(int level, const char *msg)
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{
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rfbErr("SSL: %s", msg);
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}
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static void rfbssl_error(const char *msg, int e)
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{
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rfbErr("%s: %s (%ld)\n", msg, gnutls_strerror(e), e);
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}
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static int rfbssl_init_session(struct rfbssl_ctx *ctx, int fd)
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{
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gnutls_session_t session;
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int ret;
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if (!GNUTLS_E_SUCCESS == (ret = gnutls_init(&session, GNUTLS_SERVER))) {
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/* */
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} else if (!GNUTLS_E_SUCCESS == (ret = gnutls_priority_set_direct(session, "EXPORT", NULL))) {
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/* */
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} else if (!GNUTLS_E_SUCCESS == (ret = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, ctx->x509_cred))) {
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/* */
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} else {
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gnutls_session_enable_compatibility_mode(session);
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gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t)fd);
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ctx->session = session;
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}
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return ret;
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}
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static int generate_dh_params(struct rfbssl_ctx *ctx)
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{
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int ret;
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if (GNUTLS_E_SUCCESS == (ret = gnutls_dh_params_init(&ctx->dh_params)))
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ret = gnutls_dh_params_generate2(ctx->dh_params, 1024);
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return ret;
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}
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#ifdef I_LIKE_RSA_PARAMS_THAT_MUCH
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static int generate_rsa_params(struct rfbssl_ctx *ctx)
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{
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int ret;
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if (GNUTLS_E_SUCCESS == (ret = gnutls_rsa_params_init(&ctx->rsa_params)))
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ret = gnutls_rsa_params_generate2(ctx->rsa_params, 512);
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return ret;
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}
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#endif
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struct rfbssl_ctx *rfbssl_init_global(char *key, char *cert)
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{
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int ret = GNUTLS_E_SUCCESS;
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struct rfbssl_ctx *ctx = NULL;
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if (NULL == (ctx = malloc(sizeof(struct rfbssl_ctx)))) {
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ret = GNUTLS_E_MEMORY_ERROR;
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} else if (!GNUTLS_E_SUCCESS == (ret = gnutls_global_init())) {
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/* */
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} else if (!GNUTLS_E_SUCCESS == (ret = gnutls_certificate_allocate_credentials(&ctx->x509_cred))) {
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/* */
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} else if (!GNUTLS_E_SUCCESS == (ret = gnutls_certificate_set_x509_trust_file(ctx->x509_cred, cert, GNUTLS_X509_FMT_PEM))) {
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/* */
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} else if (!GNUTLS_E_SUCCESS == (ret = gnutls_certificate_set_x509_key_file(ctx->x509_cred, cert, key, GNUTLS_X509_FMT_PEM))) {
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/* */
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} else if (!GNUTLS_E_SUCCESS == (ret = generate_dh_params(ctx))) {
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/* */
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#ifdef I_LIKE_RSA_PARAMS_THAT_MUCH
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} else if (!GNUTLS_E_SUCCESS == (ret = generate_rsa_params(ctx))) {
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/* */
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#endif
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} else {
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gnutls_global_set_log_function(rfbssl_log_func);
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gnutls_global_set_log_level(1);
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gnutls_certificate_set_dh_params(ctx->x509_cred, ctx->dh_params);
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return ctx;
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}
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free(ctx);
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return NULL;
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}
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int rfbssl_init(rfbClientPtr cl)
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{
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int ret = -1;
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struct rfbssl_ctx *ctx;
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char *keyfile;
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if (!(keyfile = cl->screen->sslkeyfile))
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keyfile = cl->screen->sslcertfile;
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if (NULL == (ctx = rfbssl_init_global(keyfile, cl->screen->sslcertfile))) {
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/* */
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} else if (GNUTLS_E_SUCCESS != (ret = rfbssl_init_session(ctx, cl->sock))) {
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/* */
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} else {
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while (GNUTLS_E_SUCCESS != (ret = gnutls_handshake(ctx->session))) {
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if (ret == GNUTLS_E_AGAIN)
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continue;
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break;
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}
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}
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if (ret != GNUTLS_E_SUCCESS) {
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rfbssl_error(__func__, ret);
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} else {
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cl->sslctx = (rfbSslCtx *)ctx;
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rfbLog("%s protocol initialized\n", gnutls_protocol_get_name(gnutls_protocol_get_version(ctx->session)));
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}
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return ret;
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}
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static int rfbssl_do_read(rfbClientPtr cl, char *buf, int bufsize)
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{
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struct rfbssl_ctx *ctx = (struct rfbssl_ctx *)cl->sslctx;
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int ret;
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while ((ret = gnutls_record_recv(ctx->session, buf, bufsize)) < 0) {
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if (ret == GNUTLS_E_AGAIN) {
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/* continue */
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} else if (ret == GNUTLS_E_INTERRUPTED) {
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/* continue */
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} else {
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break;
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}
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}
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if (ret < 0) {
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rfbssl_error(__func__, ret);
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errno = EIO;
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ret = -1;
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}
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return ret < 0 ? -1 : ret;
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}
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int rfbssl_write(rfbClientPtr cl, const char *buf, int bufsize)
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{
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struct rfbssl_ctx *ctx = (struct rfbssl_ctx *)cl->sslctx;
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int ret;
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while ((ret = gnutls_record_send(ctx->session, buf, bufsize)) < 0) {
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if (ret == GNUTLS_E_AGAIN) {
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/* continue */
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} else if (ret == GNUTLS_E_INTERRUPTED) {
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/* continue */
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} else {
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break;
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}
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}
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if (ret < 0)
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rfbssl_error(__func__, ret);
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return ret;
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}
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int rfbssl_peek(rfbClientPtr cl, char *buf, int bufsize)
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{
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int ret = -1;
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struct rfbssl_ctx *ctx = (struct rfbssl_ctx *)cl->sslctx;
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if (ctx->peekstart) {
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int spaceleft = sizeof(ctx->peekbuf) - ctx->peeklen - ctx->peekstart;
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if (spaceleft < bufsize) {
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memmove(ctx->peekbuf, ctx->peekbuf + ctx->peekstart, ctx->peeklen);
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ctx->peekstart = 0;
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}
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}
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/* If we have any peek data, simply return that. */
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if (ctx->peeklen) {
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if (bufsize > ctx->peeklen) {
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/* more than we have, so we are trying to read the remaining
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* bytes
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**/
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int required = bufsize - ctx->peeklen;
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int total = ctx->peekstart + ctx->peeklen;
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int n, avail = sizeof(ctx->peekbuf) - total;
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if (required > avail)
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required = avail;
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if (!required) {
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rfbErr("%s: no space left\n", __func__);
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} else if ((n = rfbssl_do_read(cl, ctx->peekbuf + total, required)) < 0) {
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rfbErr("%s: read error\n", __func__);
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return n;
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} else {
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ctx->peeklen += n;
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}
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ret = ctx->peeklen;
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} else {
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/* simply return what we have */
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ret = bufsize;
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}
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} else {
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ret = bufsize;
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if (ret > sizeof(ctx->peekbuf))
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ret = sizeof(ctx->peekbuf);
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if ((ret = rfbssl_do_read(cl, ctx->peekbuf, ret)) > 0)
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ctx->peeklen = ret;
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}
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if (ret >= 0) {
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memcpy(buf, ctx->peekbuf + ctx->peekstart, ret);
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}
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return ret;
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}
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int rfbssl_read(rfbClientPtr cl, char *buf, int bufsize)
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{
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int ret;
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struct rfbssl_ctx *ctx = (struct rfbssl_ctx *)cl->sslctx;
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if (ctx->peeklen) {
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/* If we have any peek data, simply return that. */
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ret = bufsize < ctx->peeklen ? bufsize : ctx->peeklen;
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memcpy (buf, ctx->peekbuf + ctx->peekstart, ret);
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ctx->peeklen -= ret;
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if (ctx->peeklen != 0)
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ctx->peekstart += ret;
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else
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ctx->peekstart = 0;
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} else {
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ret = rfbssl_do_read(cl, buf, bufsize);
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}
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return ret;
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}
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int rfbssl_pending(rfbClientPtr cl)
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{
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struct rfbssl_ctx *ctx = (struct rfbssl_ctx *)cl->sslctx;
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int ret = ctx->peeklen;
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if (ret <= 0)
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ret = gnutls_record_check_pending(ctx->session);
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return ret;
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}
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void rfbssl_destroy(rfbClientPtr cl)
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{
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struct rfbssl_ctx *ctx = (struct rfbssl_ctx *)cl->sslctx;
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gnutls_bye(ctx->session, GNUTLS_SHUT_WR);
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gnutls_deinit(ctx->session);
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gnutls_certificate_free_credentials(ctx->x509_cred);
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}
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