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websockets: Add encryption support

Browse Source 
[jes: moved out GnuTLS and OpenSSL support, added a dummy support, to
separate changes better, and to keep things compiling]

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
pull/1/head
Gernot Tenchio 13 years ago committed by Johannes Schindelin
parent 7a77cc32b2
commit 4aa3586367
7 changed files with 204 additions and 27 deletions
Show Stats Download Patch File Download Diff File

2
libvncserver/Makefile.am
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@ -13,7 +13,7 @@ TIGHTVNCFILETRANSFERSRCS = tightvnc-filetransfer/rfbtightserver.c \
endif
if WITH_WEBSOCKETS
WEBSOCKETSSRCS = websockets.c md5.c
WEBSOCKETSSRCS = websockets.c md5.c rfbssl_none.c
endif
includedir=$(prefix)/include/rfb

55
libvncserver/rfbserver.c
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@ -73,6 +73,10 @@
/* strftime() */
#include <time.h>
#ifdef LIBVNCSERVER_WITH_WEBSOCKETS
#include "rfbssl.h"
#endif
#ifdef __MINGW32__
static int compat_mkdir(const char *path, int mode)
{
@ -360,7 +364,6 @@ rfbNewTCPOrUDPClient(rfbScreenInfoPtr rfbScreen,
#ifdef LIBVNCSERVER_WITH_WEBSOCKETS
cl->webSockets = FALSE;
cl->webSocketsSSL = FALSE;
cl->webSocketsBase64 = FALSE;
cl->dblen= 0;
cl->carrylen = 0;
@ -1841,16 +1844,50 @@ rfbProcessClientNormalMessage(rfbClientPtr cl)
#ifdef LIBVNCSERVER_WITH_WEBSOCKETS
if (cl->webSockets) {
n = recv(cl->sock, encBuf, 4, MSG_PEEK);
if (cl->webSocketsBase64) {
if (cl->sslctx)
n = rfbssl_peek(cl, encBuf, 4);
else
n = recv(cl->sock, encBuf, 4, MSG_PEEK);
if (n <= 0) {
if (n != 0)
rfbLogPerror("rfbProcessClientNormalMessage: peek");
rfbCloseClient(cl);
return;
}
if (cl->webSocketsBase64) {
/* With Base64 encoding we need at least 4 bytes */
if ((n > 0) && (n < 4)) {
if (encBuf[0] == '\xff') {
int doclose = 0;
/* Make sure we don't miss a client disconnect on an end frame
* marker */
n = read(cl->sock, encBuf, 1);
* marker. Because we use a peek buffer in some cases it is not
* applicable to wait for more data per select(). */
switch (n) {
case 3:
if (encBuf[1] == '\xff' && encBuf[2] == '\x00')
doclose = 1;
break;
case 2:
if (encBuf[1] == '\x00')
doclose = 1;
break;
default:
;
}
if (cl->sslctx)
n = rfbssl_read(cl, encBuf, n);
else
n = read(cl->sock, encBuf, n);
if (doclose) {
rfbErr("rfbProcessClientNormalMessage: websocket close frame received\n");
rfbCloseClient(cl);
}
return;
}
return;
}
} else {
/* With UTF-8 encoding we need at least 3 bytes (framing + 1) */
@ -1858,9 +1895,11 @@ rfbProcessClientNormalMessage(rfbClientPtr cl)
if (encBuf[0] == '\xff') {
/* Make sure we don't miss a client disconnect on an end frame
* marker */
n = read(cl->sock, encBuf, 1);
if (cl->sslctx)
n = rfbssl_read(cl, encBuf, 1);
else
n = read(cl->sock, encBuf, 1);
}
return;
}
}
}

15
libvncserver/rfbssl.h
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@ -0,0 +1,15 @@
#ifndef _VNCSSL_H
#define _VNCSSL_H 1
#include "rfb/rfb.h"
#include "rfb/rfbconfig.h"
int rfbssl_init(rfbClientPtr cl);
int rfbssl_pending(rfbClientPtr cl);
int rfbssl_peek(rfbClientPtr cl, char *buf, int bufsize);
int rfbssl_read(rfbClientPtr cl, char *buf, int bufsize);
int rfbssl_write(rfbClientPtr cl, const char *buf, int bufsize);
void rfbssl_destroy(rfbClientPtr cl);
#endif /* _VNCSSL_H */

58
libvncserver/rfbssl_none.c
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@ -0,0 +1,58 @@
/*
* rfbssl_none.c - Secure socket functions (fallback to failing)
*/
/*
* Copyright (C) 2011 Johannes Schindelin
*
* 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"
struct rfbssl_ctx *rfbssl_init_global(char *key, char *cert)
{
return NULL;
}
int rfbssl_init(rfbClientPtr cl)
{
return -1;
}
int rfbssl_write(rfbClientPtr cl, const char *buf, int bufsize)
{
return -1;
}
int rfbssl_peek(rfbClientPtr cl, char *buf, int bufsize)
{
return -1;
}
int rfbssl_read(rfbClientPtr cl, char *buf, int bufsize)
{
return -1;
}
int rfbssl_pending(rfbClientPtr cl)
{
return -1;
}
void rfbssl_destroy(rfbClientPtr cl)
{
}

43
libvncserver/sockets.c
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@ -62,6 +62,10 @@
#include <unistd.h>
#endif
#ifdef LIBVNCSERVER_WITH_WEBSOCKETS
#include "rfbssl.h"
#endif
#if defined(__linux__) && defined(NEED_TIMEVAL)
struct timeval
{
@ -392,6 +396,10 @@ rfbCloseClient(rfbClientPtr cl)
while(cl->screen->maxFd>0
&& !FD_ISSET(cl->screen->maxFd,&(cl->screen->allFds)))
cl->screen->maxFd--;
#ifdef LIBVNCSERVER_WITH_WEBSOCKETS
if (cl->sslctx)
rfbssl_destroy(cl);
#endif
#ifndef __MINGW32__
shutdown(cl->sock,SHUT_RDWR);
#endif
@ -460,7 +468,9 @@ rfbReadExactTimeout(rfbClientPtr cl, char* buf, int len, int timeout)
#ifdef LIBVNCSERVER_WITH_WEBSOCKETS
if (cl->webSockets) {
n = webSocketsDecode(cl, buf, len);
} else {
} else if (cl->sslctx) {
n = rfbssl_read(cl, buf, len);
} else {
n = read(sock, buf, len);
}
#else
@ -490,6 +500,12 @@ rfbReadExactTimeout(rfbClientPtr cl, char* buf, int len, int timeout)
return n;
}
#ifdef LIBVNCSERVER_WITH_WEBSOCKETS
if (cl->sslctx) {
if (rfbssl_pending(cl))
continue;
}
#endif
FD_ZERO(&fds);
FD_SET(sock, &fds);
tv.tv_sec = timeout / 1000;
@ -500,6 +516,7 @@ rfbReadExactTimeout(rfbClientPtr cl, char* buf, int len, int timeout)
return n;
}
if (n == 0) {
rfbErr("ReadExact: select timeout\n");
errno = ETIMEDOUT;
return -1;
}
@ -540,7 +557,12 @@ rfbPeekExactTimeout(rfbClientPtr cl, char* buf, int len, int timeout)
struct timeval tv;
while (len > 0) {
n = recv(sock, buf, len, MSG_PEEK);
#ifdef LIBVNCSERVER_WITH_WEBSOCKETS
if (cl->sslctx)
n = rfbssl_peek(cl, buf, len);
else
#endif
n = recv(sock, buf, len, MSG_PEEK);
if (n == len) {
@ -564,13 +586,19 @@ rfbPeekExactTimeout(rfbClientPtr cl, char* buf, int len, int timeout)
return n;
}
#ifdef LIBVNCSERVER_WITH_WEBSOCKETS
if (cl->sslctx) {
if (rfbssl_pending(cl))
continue;
}
#endif
FD_ZERO(&fds);
FD_SET(sock, &fds);
tv.tv_sec = timeout / 1000;
tv.tv_usec = (timeout % 1000) * 1000;
n = select(sock+1, &fds, NULL, &fds, &tv);
if (n < 0) {
rfbLogPerror("ReadExact: select");
rfbLogPerror("PeekExact: select");
return n;
}
if (n == 0) {
@ -581,7 +609,7 @@ rfbPeekExactTimeout(rfbClientPtr cl, char* buf, int len, int timeout)
}
#undef DEBUG_READ_EXACT
#ifdef DEBUG_READ_EXACT
rfbLog("ReadExact %d bytes\n",len);
rfbLog("PeekExact %d bytes\n",len);
for(n=0;n<len;n++)
fprintf(stderr,"%02x ",(unsigned char)buf[n]);
fprintf(stderr,"\n");
@ -628,7 +656,12 @@ rfbWriteExact(rfbClientPtr cl,
LOCK(cl->outputMutex);
while (len > 0) {
n = write(sock, buf, len);
#ifdef LIBVNCSERVER_WITH_WEBSOCKETS
if (cl->sslctx)
n = rfbssl_write(cl, buf, len);
else
#endif
n = write(sock, buf, len);
if (n > 0) {

49
libvncserver/websockets.c
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@ -32,6 +32,7 @@
#include <errno.h>
#include <md5.h>
#include "rfbssl.h"
#define FLASH_POLICY_RESPONSE "<cross-domain-policy><allow-access-from domain=\"*\" to-ports=\"*\" /></cross-domain-policy>\n"
#define SZ_FLASH_POLICY_RESPONSE 93
@ -91,15 +92,15 @@ webSocketsCheck (rfbClientPtr cl)
rfbErr("webSocketsHandshake: failed sending Flash policy response");
}
return FALSE;
} else if (strncmp(bbuf, "\x16", 1) == 0) {
cl->webSocketsSSL = TRUE;
} else if (strncmp(bbuf, "\x16", 1) == 0 || strncmp(bbuf, "\x80", 1) == 0) {
rfbLog("Got TLS/SSL WebSockets connection\n");
if (-1 == rfbssl_init(cl)) {
rfbErr("webSocketsHandshake: rfbssl_init failed\n");
return FALSE;
}
ret = rfbPeekExactTimeout(cl, bbuf, 4, WEBSOCKETS_CLIENT_CONNECT_WAIT_MS);
scheme = "wss";
/* TODO */
/* bbuf = ... */
return FALSE;
} else {
cl->webSocketsSSL = FALSE;
scheme = "ws";
}
@ -334,6 +335,30 @@ webSocketsEncode(rfbClientPtr cl, const char *src, int len)
return sz;
}
static int
ws_read(rfbClientPtr cl, char *buf, int len)
{
int n;
if (cl->sslctx) {
n = rfbssl_read(cl, buf, len);
} else {
n = read(cl->sock, buf, len);
}
return n;
}
static int
ws_peek(rfbClientPtr cl, char *buf, int len)
{
int n;
if (cl->sslctx) {
n = rfbssl_peek(cl, buf, len);
} else {
n = recv(cl->sock, buf, len, MSG_PEEK);
}
return n;
}
int
webSocketsDecode(rfbClientPtr cl, char *dst, int len)
{
@ -343,10 +368,10 @@ webSocketsDecode(rfbClientPtr cl, char *dst, int len)
buf = cl->decodeBuf;
n = recv(cl->sock, buf, len*2+2, MSG_PEEK);
n = ws_peek(cl, buf, len*2+2);
if (n <= 0) {
rfbLog("recv of %d\n", n);
rfbErr("%s: recv of %d\n", __func__, n);
return n;
}
@ -355,7 +380,7 @@ webSocketsDecode(rfbClientPtr cl, char *dst, int len)
/* Base64 encoded WebSockets stream */
if (buf[0] == '\xff') {
i = read(cl->sock, buf, 1); /* Consume marker */
i = ws_read(cl, buf, 1); /* Consume marker */
buf++;
n--;
}
@ -364,7 +389,7 @@ webSocketsDecode(rfbClientPtr cl, char *dst, int len)
return -1;
}
if (buf[0] == '\x00') {
i = read(cl->sock, buf, 1); /* Consume marker */
i = ws_read(cl, buf, 1); /* Consume marker */
buf++;
n--;
}
@ -414,7 +439,7 @@ webSocketsDecode(rfbClientPtr cl, char *dst, int len)
retlen += n;
/* Consume the data from socket */
i = read(cl->sock, buf, needlen);
i = ws_read(cl, buf, needlen);
cl->carrylen = n - len;
retlen -= cl->carrylen;
@ -445,7 +470,7 @@ webSocketsDecode(rfbClientPtr cl, char *dst, int len)
}
/* Consume what we need */
if ((n = read(cl->sock, buf, needlen)) < needlen) {
if ((n = ws_read(cl, buf, needlen)) < needlen) {
return n;
}

9
rfb/rfb.h
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@ -368,6 +368,10 @@ typedef struct _rfbScreenInfo
rfbDisplayFinishedHookPtr displayFinishedHook;
/** xvpHook is called to handle an xvp client message */
rfbXvpHookPtr xvpHook;
#ifdef LIBVNCSERVER_WITH_WEBSOCKETS
char *sslkeyfile;
char *sslcertfile;
#endif
} rfbScreenInfo, *rfbScreenInfoPtr;
@ -414,6 +418,8 @@ typedef struct _rfbStatList {
struct _rfbStatList *Next;
} rfbStatList;
typedef struct _rfbSslCtx rfbSslCtx;
typedef struct _rfbClientRec {
/** back pointer to the screen */
@ -637,8 +643,9 @@ typedef struct _rfbClientRec {
rfbBool webSocketsSSL;
rfbBool webSocketsBase64;
char encodeBuf[UPDATE_BUF_SIZE*2 + 2]; /* UTF-8 could double it + framing */
rfbSslCtx *sslctx;
char encodeBuf[UPDATE_BUF_SIZE*2 + 2]; /* UTF-8 could double it + framing */
char decodeBuf[8192]; /* TODO: what makes sense? */
int dblen;
char carryBuf[3]; /* For base64 carry-over */

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