Shared TDE VNC library sources
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libtdevnc/libvncserver/rfbssl_openssl.c

135 lines
3.7 KiB

/*
* rfbssl_openssl.c - Secure socket funtions (openssl version)
*/
/*
* Copyright (C) 2011 Gernot Tenchio
*
* This is free software; you can redistribute it and/or modify
* it under the terms of 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.
*
* This software 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include "rfbssl.h"
#include <openssl/ssl.h>
#include <openssl/err.h>
struct rfbssl_ctx {
SSL_CTX *ssl_ctx;
SSL *ssl;
};
static void rfbssl_error(void)
{
char buf[1024];
unsigned long e = ERR_get_error();
rfbErr("%s (%ld)\n", ERR_error_string(e, buf), e);
}
int rfbssl_init(rfbClientPtr cl)
{
char *keyfile;
int r, ret = -1;
struct rfbssl_ctx *ctx;
SSL_library_init();
SSL_load_error_strings();
if (cl->screen->sslkeyfile && *cl->screen->sslkeyfile) {
keyfile = cl->screen->sslkeyfile;
} else {
keyfile = cl->screen->sslcertfile;
}
if (NULL == (ctx = malloc(sizeof(struct rfbssl_ctx)))) {
rfbErr("OOM\n");
} else if (!cl->screen->sslcertfile || !cl->screen->sslcertfile[0]) {
rfbErr("SSL connection but no cert specified\n");
} else if (NULL == (ctx->ssl_ctx = SSL_CTX_new(TLSv1_server_method()))) {
rfbssl_error();
} else if (SSL_CTX_use_PrivateKey_file(ctx->ssl_ctx, keyfile, SSL_FILETYPE_PEM) <= 0) {
rfbErr("Unable to load private key file %s\n", keyfile);
} else if (SSL_CTX_use_certificate_file(ctx->ssl_ctx, cl->screen->sslcertfile, SSL_FILETYPE_PEM) <= 0) {
rfbErr("Unable to load certificate file %s\n", cl->screen->sslcertfile);
} else if (NULL == (ctx->ssl = SSL_new(ctx->ssl_ctx))) {
rfbErr("SSL_new failed\n");
rfbssl_error();
} else if (!(SSL_set_fd(ctx->ssl, cl->sock))) {
rfbErr("SSL_set_fd failed\n");
rfbssl_error();
} else {
while ((r = SSL_accept(ctx->ssl)) < 0) {
if (SSL_get_error(ctx->ssl, r) != SSL_ERROR_WANT_READ)
break;
}
if (r < 0) {
rfbErr("SSL_accept failed %d\n", SSL_get_error(ctx->ssl, r));
} else {
cl->sslctx = (rfbSslCtx *)ctx;
ret = 0;
}
}
return ret;
}
int rfbssl_write(rfbClientPtr cl, const char *buf, int bufsize)
{
int ret;
struct rfbssl_ctx *ctx = (struct rfbssl_ctx *)cl->sslctx;
while ((ret = SSL_write(ctx->ssl, buf, bufsize)) <= 0) {
if (SSL_get_error(ctx->ssl, ret) != SSL_ERROR_WANT_WRITE)
break;
}
return ret;
}
int rfbssl_peek(rfbClientPtr cl, char *buf, int bufsize)
{
int ret;
struct rfbssl_ctx *ctx = (struct rfbssl_ctx *)cl->sslctx;
while ((ret = SSL_peek(ctx->ssl, buf, bufsize)) <= 0) {
if (SSL_get_error(ctx->ssl, ret) != SSL_ERROR_WANT_READ)
break;
}
return ret;
}
int rfbssl_read(rfbClientPtr cl, char *buf, int bufsize)
{
int ret;
struct rfbssl_ctx *ctx = (struct rfbssl_ctx *)cl->sslctx;
while ((ret = SSL_read(ctx->ssl, buf, bufsize)) <= 0) {
if (SSL_get_error(ctx->ssl, ret) != SSL_ERROR_WANT_READ)
break;
}
return ret;
}
int rfbssl_pending(rfbClientPtr cl)
{
struct rfbssl_ctx *ctx = (struct rfbssl_ctx *)cl->sslctx;
return SSL_pending(ctx->ssl);
}
void rfbssl_destroy(rfbClientPtr cl)
{
struct rfbssl_ctx *ctx = (struct rfbssl_ctx *)cl->sslctx;
if (ctx->ssl)
SSL_free(ctx->ssl);
if (ctx->ssl_ctx)
SSL_CTX_free(ctx->ssl_ctx);
}