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freebsd-dev/usr.sbin/bhyve/rfb.c
Marcelo Araujo abfa3c39e7 Use capsicum_helpers(3) that allow us to simplify the code and its functions 
will return success when the kernel is built without support of
the capability mode.

It is important to note, that I'm taking a more conservative approach
with these changes and it will be done in small steps.

Reviewed by:	jhb
MFC after:	6 weeks
Differential Revision:	https://reviews.freebsd.org/D18744
2019-01-16 00:39:23 +00:00

1055 lines
23 KiB
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2015 Tycho Nightingale <tycho.nightingale@pluribusnetworks.com>
* Copyright (c) 2015 Leon Dang
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#ifndef WITHOUT_CAPSICUM
#include <sys/capsicum.h>
#endif
#include <sys/endian.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/time.h>
#include <arpa/inet.h>
#include <machine/cpufunc.h>
#include <machine/specialreg.h>
#include <netinet/in.h>
#include <netdb.h>
#include <assert.h>
#ifndef WITHOUT_CAPSICUM
#include <capsicum_helpers.h>
#endif
#include <err.h>
#include <errno.h>
#include <pthread.h>
#include <pthread_np.h>
#include <signal.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include <zlib.h>
#include "bhyvegc.h"
#include "console.h"
#include "rfb.h"
#include "sockstream.h"
#ifndef NO_OPENSSL
#include <openssl/des.h>
#endif
static int rfb_debug = 0;
#define DPRINTF(params) if (rfb_debug) printf params
#define WPRINTF(params) printf params
#define AUTH_LENGTH 16
#define PASSWD_LENGTH 8
#define SECURITY_TYPE_NONE 1
#define SECURITY_TYPE_VNC_AUTH 2
#define AUTH_FAILED_UNAUTH 1
#define AUTH_FAILED_ERROR 2
struct rfb_softc {
int sfd;
pthread_t tid;
int cfd;
int width, height;
char *password;
bool enc_raw_ok;
bool enc_zlib_ok;
bool enc_resize_ok;
z_stream zstream;
uint8_t *zbuf;
int zbuflen;
int conn_wait;
int sending;
pthread_mutex_t mtx;
pthread_cond_t cond;
int hw_crc;
uint32_t *crc; /* WxH crc cells */
uint32_t *crc_tmp; /* buffer to store single crc row */
int crc_width, crc_height;
};
struct rfb_pixfmt {
uint8_t bpp;
uint8_t depth;
uint8_t bigendian;
uint8_t truecolor;
uint16_t red_max;
uint16_t green_max;
uint16_t blue_max;
uint8_t red_shift;
uint8_t green_shift;
uint8_t blue_shift;
uint8_t pad[3];
};
struct rfb_srvr_info {
uint16_t width;
uint16_t height;
struct rfb_pixfmt pixfmt;
uint32_t namelen;
};
struct rfb_pixfmt_msg {
uint8_t type;
uint8_t pad[3];
struct rfb_pixfmt pixfmt;
};
#define RFB_ENCODING_RAW 0
#define RFB_ENCODING_ZLIB 6
#define RFB_ENCODING_RESIZE -223
#define RFB_MAX_WIDTH 2000
#define RFB_MAX_HEIGHT 1200
#define RFB_ZLIB_BUFSZ RFB_MAX_WIDTH*RFB_MAX_HEIGHT*4
/* percentage changes to screen before sending the entire screen */
#define RFB_SEND_ALL_THRESH 25
struct rfb_enc_msg {
uint8_t type;
uint8_t pad;
uint16_t numencs;
};
struct rfb_updt_msg {
uint8_t type;
uint8_t incremental;
uint16_t x;
uint16_t y;
uint16_t width;
uint16_t height;
};
struct rfb_key_msg {
uint8_t type;
uint8_t down;
uint16_t pad;
uint32_t code;
};
struct rfb_ptr_msg {
uint8_t type;
uint8_t button;
uint16_t x;
uint16_t y;
};
struct rfb_srvr_updt_msg {
uint8_t type;
uint8_t pad;
uint16_t numrects;
};
struct rfb_srvr_rect_hdr {
uint16_t x;
uint16_t y;
uint16_t width;
uint16_t height;
uint32_t encoding;
};
struct rfb_cuttext_msg {
uint8_t type;
uint8_t padding[3];
uint32_t length;
};
static void
rfb_send_server_init_msg(int cfd)
{
struct bhyvegc_image *gc_image;
struct rfb_srvr_info sinfo;
gc_image = console_get_image();
sinfo.width = htons(gc_image->width);
sinfo.height = htons(gc_image->height);
sinfo.pixfmt.bpp = 32;
sinfo.pixfmt.depth = 32;
sinfo.pixfmt.bigendian = 0;
sinfo.pixfmt.truecolor = 1;
sinfo.pixfmt.red_max = htons(255);
sinfo.pixfmt.green_max = htons(255);
sinfo.pixfmt.blue_max = htons(255);
sinfo.pixfmt.red_shift = 16;
sinfo.pixfmt.green_shift = 8;
sinfo.pixfmt.blue_shift = 0;
sinfo.namelen = htonl(strlen("bhyve"));
(void)stream_write(cfd, &sinfo, sizeof(sinfo));
(void)stream_write(cfd, "bhyve", strlen("bhyve"));
}
static void
rfb_send_resize_update_msg(struct rfb_softc *rc, int cfd)
{
struct rfb_srvr_updt_msg supdt_msg;
struct rfb_srvr_rect_hdr srect_hdr;
/* Number of rectangles: 1 */
supdt_msg.type = 0;
supdt_msg.pad = 0;
supdt_msg.numrects = htons(1);
stream_write(cfd, &supdt_msg, sizeof(struct rfb_srvr_updt_msg));
/* Rectangle header */
srect_hdr.x = htons(0);
srect_hdr.y = htons(0);
srect_hdr.width = htons(rc->width);
srect_hdr.height = htons(rc->height);
srect_hdr.encoding = htonl(RFB_ENCODING_RESIZE);
stream_write(cfd, &srect_hdr, sizeof(struct rfb_srvr_rect_hdr));
}
static void
rfb_recv_set_pixfmt_msg(struct rfb_softc *rc, int cfd)
{
struct rfb_pixfmt_msg pixfmt_msg;
(void)stream_read(cfd, ((void *)&pixfmt_msg)+1, sizeof(pixfmt_msg)-1);
}
static void
rfb_recv_set_encodings_msg(struct rfb_softc *rc, int cfd)
{
struct rfb_enc_msg enc_msg;
int i;
uint32_t encoding;
assert((sizeof(enc_msg) - 1) == 3);
(void)stream_read(cfd, ((void *)&enc_msg)+1, sizeof(enc_msg)-1);
for (i = 0; i < htons(enc_msg.numencs); i++) {
(void)stream_read(cfd, &encoding, sizeof(encoding));
switch (htonl(encoding)) {
case RFB_ENCODING_RAW:
rc->enc_raw_ok = true;
break;
case RFB_ENCODING_ZLIB:
rc->enc_zlib_ok = true;
deflateInit(&rc->zstream, Z_BEST_SPEED);
break;
case RFB_ENCODING_RESIZE:
rc->enc_resize_ok = true;
break;
}
}
}
/*
* Calculate CRC32 using SSE4.2; Intel or AMD Bulldozer+ CPUs only
*/
static __inline uint32_t
fast_crc32(void *buf, int len, uint32_t crcval)
{
uint32_t q = len / sizeof(uint32_t);
uint32_t *p = (uint32_t *)buf;
while (q--) {
asm volatile (
".byte 0xf2, 0xf, 0x38, 0xf1, 0xf1;"
:"=S" (crcval)
:"0" (crcval), "c" (*p)
);
p++;
}
return (crcval);
}
static int
rfb_send_rect(struct rfb_softc *rc, int cfd, struct bhyvegc_image *gc,
int x, int y, int w, int h)
{
struct rfb_srvr_updt_msg supdt_msg;
struct rfb_srvr_rect_hdr srect_hdr;
unsigned long zlen;
ssize_t nwrite, total;
int err;
uint32_t *p;
uint8_t *zbufp;
/*
* Send a single rectangle of the given x, y, w h dimensions.
*/
/* Number of rectangles: 1 */
supdt_msg.type = 0;
supdt_msg.pad = 0;
supdt_msg.numrects = htons(1);
nwrite = stream_write(cfd, &supdt_msg,
sizeof(struct rfb_srvr_updt_msg));
if (nwrite <= 0)
return (nwrite);
/* Rectangle header */
srect_hdr.x = htons(x);
srect_hdr.y = htons(y);
srect_hdr.width = htons(w);
srect_hdr.height = htons(h);
h = y + h;
w *= sizeof(uint32_t);
if (rc->enc_zlib_ok) {
zbufp = rc->zbuf;
rc->zstream.total_in = 0;
rc->zstream.total_out = 0;
for (p = &gc->data[y * gc->width + x]; y < h; y++) {
rc->zstream.next_in = (Bytef *)p;
rc->zstream.avail_in = w;
rc->zstream.next_out = (Bytef *)zbufp;
rc->zstream.avail_out = RFB_ZLIB_BUFSZ + 16 -
rc->zstream.total_out;
rc->zstream.data_type = Z_BINARY;
/* Compress with zlib */
err = deflate(&rc->zstream, Z_SYNC_FLUSH);
if (err != Z_OK) {
WPRINTF(("zlib[rect] deflate err: %d\n", err));
rc->enc_zlib_ok = false;
deflateEnd(&rc->zstream);
goto doraw;
}
zbufp = rc->zbuf + rc->zstream.total_out;
p += gc->width;
}
srect_hdr.encoding = htonl(RFB_ENCODING_ZLIB);
nwrite = stream_write(cfd, &srect_hdr,
sizeof(struct rfb_srvr_rect_hdr));
if (nwrite <= 0)
return (nwrite);
zlen = htonl(rc->zstream.total_out);
nwrite = stream_write(cfd, &zlen, sizeof(uint32_t));
if (nwrite <= 0)
return (nwrite);
return (stream_write(cfd, rc->zbuf, rc->zstream.total_out));
}
doraw:
total = 0;
zbufp = rc->zbuf;
for (p = &gc->data[y * gc->width + x]; y < h; y++) {
memcpy(zbufp, p, w);
zbufp += w;
total += w;
p += gc->width;
}
srect_hdr.encoding = htonl(RFB_ENCODING_RAW);
nwrite = stream_write(cfd, &srect_hdr,
sizeof(struct rfb_srvr_rect_hdr));
if (nwrite <= 0)
return (nwrite);
total = stream_write(cfd, rc->zbuf, total);
return (total);
}
static int
rfb_send_all(struct rfb_softc *rc, int cfd, struct bhyvegc_image *gc)
{
struct rfb_srvr_updt_msg supdt_msg;
struct rfb_srvr_rect_hdr srect_hdr;
ssize_t nwrite;
unsigned long zlen;
int err;
/*
* Send the whole thing
*/
/* Number of rectangles: 1 */
supdt_msg.type = 0;
supdt_msg.pad = 0;
supdt_msg.numrects = htons(1);
nwrite = stream_write(cfd, &supdt_msg,
sizeof(struct rfb_srvr_updt_msg));
if (nwrite <= 0)
return (nwrite);
/* Rectangle header */
srect_hdr.x = 0;
srect_hdr.y = 0;
srect_hdr.width = htons(gc->width);
srect_hdr.height = htons(gc->height);
if (rc->enc_zlib_ok) {
rc->zstream.next_in = (Bytef *)gc->data;
rc->zstream.avail_in = gc->width * gc->height *
sizeof(uint32_t);
rc->zstream.next_out = (Bytef *)rc->zbuf;
rc->zstream.avail_out = RFB_ZLIB_BUFSZ + 16;
rc->zstream.data_type = Z_BINARY;
rc->zstream.total_in = 0;
rc->zstream.total_out = 0;
/* Compress with zlib */
err = deflate(&rc->zstream, Z_SYNC_FLUSH);
if (err != Z_OK) {
WPRINTF(("zlib deflate err: %d\n", err));
rc->enc_zlib_ok = false;
deflateEnd(&rc->zstream);
goto doraw;
}
srect_hdr.encoding = htonl(RFB_ENCODING_ZLIB);
nwrite = stream_write(cfd, &srect_hdr,
sizeof(struct rfb_srvr_rect_hdr));
if (nwrite <= 0)
return (nwrite);
zlen = htonl(rc->zstream.total_out);
nwrite = stream_write(cfd, &zlen, sizeof(uint32_t));
if (nwrite <= 0)
return (nwrite);
return (stream_write(cfd, rc->zbuf, rc->zstream.total_out));
}
doraw:
srect_hdr.encoding = htonl(RFB_ENCODING_RAW);
nwrite = stream_write(cfd, &srect_hdr,
sizeof(struct rfb_srvr_rect_hdr));
if (nwrite <= 0)
return (nwrite);
nwrite = stream_write(cfd, gc->data,
gc->width * gc->height * sizeof(uint32_t));
return (nwrite);
}
#define PIX_PER_CELL 32
#define PIXCELL_SHIFT 5
#define PIXCELL_MASK 0x1F
static int
rfb_send_screen(struct rfb_softc *rc, int cfd, int all)
{
struct bhyvegc_image *gc_image;
ssize_t nwrite;
int x, y;
int celly, cellwidth;
int xcells, ycells;
int w, h;
uint32_t *p;
int rem_x, rem_y; /* remainder for resolutions not x32 pixels ratio */
int retval;
uint32_t *crc_p, *orig_crc;
int changes;
console_refresh();
gc_image = console_get_image();
pthread_mutex_lock(&rc->mtx);
if (rc->sending) {
pthread_mutex_unlock(&rc->mtx);
return (1);
}
rc->sending = 1;
pthread_mutex_unlock(&rc->mtx);
retval = 0;
if (all) {
retval = rfb_send_all(rc, cfd, gc_image);
goto done;
}
/*
* Calculate the checksum for each 32x32 cell. Send each that
* has changed since the last scan.
*/
/* Resolution changed */
rc->crc_width = gc_image->width;
rc->crc_height = gc_image->height;
w = rc->crc_width;
h = rc->crc_height;
xcells = howmany(rc->crc_width, PIX_PER_CELL);
ycells = howmany(rc->crc_height, PIX_PER_CELL);
rem_x = w & PIXCELL_MASK;
rem_y = h & PIXCELL_MASK;
if (!rem_y)
rem_y = PIX_PER_CELL;
p = gc_image->data;
/*
* Go through all cells and calculate crc. If significant number
* of changes, then send entire screen.
* crc_tmp is dual purpose: to store the new crc and to flag as
* a cell that has changed.
*/
crc_p = rc->crc_tmp - xcells;
orig_crc = rc->crc - xcells;
changes = 0;
memset(rc->crc_tmp, 0, sizeof(uint32_t) * xcells * ycells);
for (y = 0; y < h; y++) {
if ((y & PIXCELL_MASK) == 0) {
crc_p += xcells;
orig_crc += xcells;
}
for (x = 0; x < xcells; x++) {
if (x == (xcells - 1) && rem_x > 0)
cellwidth = rem_x;
else
cellwidth = PIX_PER_CELL;
if (rc->hw_crc)
crc_p[x] = fast_crc32(p,
cellwidth * sizeof(uint32_t),
crc_p[x]);
else
crc_p[x] = (uint32_t)crc32(crc_p[x],
(Bytef *)p,
cellwidth * sizeof(uint32_t));
p += cellwidth;
/* check for crc delta if last row in cell */
if ((y & PIXCELL_MASK) == PIXCELL_MASK || y == (h-1)) {
if (orig_crc[x] != crc_p[x]) {
orig_crc[x] = crc_p[x];
crc_p[x] = 1;
changes++;
} else {
crc_p[x] = 0;
}
}
}
}
/* If number of changes is > THRESH percent, send the whole screen */
if (((changes * 100) / (xcells * ycells)) >= RFB_SEND_ALL_THRESH) {
retval = rfb_send_all(rc, cfd, gc_image);
goto done;
}
/* Go through all cells, and send only changed ones */
crc_p = rc->crc_tmp;
for (y = 0; y < h; y += PIX_PER_CELL) {
/* previous cell's row */
celly = (y >> PIXCELL_SHIFT);
/* Delta check crc to previous set */
for (x = 0; x < xcells; x++) {
if (*crc_p++ == 0)
continue;
if (x == (xcells - 1) && rem_x > 0)
cellwidth = rem_x;
else
cellwidth = PIX_PER_CELL;
nwrite = rfb_send_rect(rc, cfd,
gc_image,
x * PIX_PER_CELL,
celly * PIX_PER_CELL,
cellwidth,
y + PIX_PER_CELL >= h ? rem_y : PIX_PER_CELL);
if (nwrite <= 0) {
retval = nwrite;
goto done;
}
}
}
retval = 1;
done:
pthread_mutex_lock(&rc->mtx);
rc->sending = 0;
pthread_mutex_unlock(&rc->mtx);
return (retval);
}
static void
rfb_recv_update_msg(struct rfb_softc *rc, int cfd, int discardonly)
{
struct rfb_updt_msg updt_msg;
struct bhyvegc_image *gc_image;
(void)stream_read(cfd, ((void *)&updt_msg) + 1 , sizeof(updt_msg) - 1);
console_refresh();
gc_image = console_get_image();
updt_msg.x = htons(updt_msg.x);
updt_msg.y = htons(updt_msg.y);
updt_msg.width = htons(updt_msg.width);
updt_msg.height = htons(updt_msg.height);
if (updt_msg.width != gc_image->width ||
updt_msg.height != gc_image->height) {
rc->width = gc_image->width;
rc->height = gc_image->height;
if (rc->enc_resize_ok)
rfb_send_resize_update_msg(rc, cfd);
}
if (discardonly)
return;
rfb_send_screen(rc, cfd, 1);
}
static void
rfb_recv_key_msg(struct rfb_softc *rc, int cfd)
{
struct rfb_key_msg key_msg;
(void)stream_read(cfd, ((void *)&key_msg) + 1, sizeof(key_msg) - 1);
console_key_event(key_msg.down, htonl(key_msg.code));
}
static void
rfb_recv_ptr_msg(struct rfb_softc *rc, int cfd)
{
struct rfb_ptr_msg ptr_msg;
(void)stream_read(cfd, ((void *)&ptr_msg) + 1, sizeof(ptr_msg) - 1);
console_ptr_event(ptr_msg.button, htons(ptr_msg.x), htons(ptr_msg.y));
}
static void
rfb_recv_cuttext_msg(struct rfb_softc *rc, int cfd)
{
struct rfb_cuttext_msg ct_msg;
unsigned char buf[32];
int len;
len = stream_read(cfd, ((void *)&ct_msg) + 1, sizeof(ct_msg) - 1);
ct_msg.length = htonl(ct_msg.length);
while (ct_msg.length > 0) {
len = stream_read(cfd, buf, ct_msg.length > sizeof(buf) ?
sizeof(buf) : ct_msg.length);
ct_msg.length -= len;
}
}
static int64_t
timeval_delta(struct timeval *prev, struct timeval *now)
{
int64_t n1, n2;
n1 = now->tv_sec * 1000000 + now->tv_usec;
n2 = prev->tv_sec * 1000000 + prev->tv_usec;
return (n1 - n2);
}
static void *
rfb_wr_thr(void *arg)
{
struct rfb_softc *rc;
fd_set rfds;
struct timeval tv;
struct timeval prev_tv;
int64_t tdiff;
int cfd;
int err;
rc = arg;
cfd = rc->cfd;
prev_tv.tv_sec = 0;
prev_tv.tv_usec = 0;
while (rc->cfd >= 0) {
FD_ZERO(&rfds);
FD_SET(cfd, &rfds);
tv.tv_sec = 0;
tv.tv_usec = 10000;
err = select(cfd+1, &rfds, NULL, NULL, &tv);
if (err < 0)
return (NULL);
/* Determine if its time to push screen; ~24hz */
gettimeofday(&tv, NULL);
tdiff = timeval_delta(&prev_tv, &tv);
if (tdiff > 40000) {
prev_tv.tv_sec = tv.tv_sec;
prev_tv.tv_usec = tv.tv_usec;
if (rfb_send_screen(rc, cfd, 0) <= 0) {
return (NULL);
}
} else {
/* sleep */
usleep(40000 - tdiff);
}
}
return (NULL);
}
void
rfb_handle(struct rfb_softc *rc, int cfd)
{
const char *vbuf = "RFB 003.008\n";
unsigned char buf[80];
unsigned char *message = NULL;
#ifndef NO_OPENSSL
unsigned char challenge[AUTH_LENGTH];
unsigned char keystr[PASSWD_LENGTH];
unsigned char crypt_expected[AUTH_LENGTH];
DES_key_schedule ks;
int i;
#endif
pthread_t tid;
uint32_t sres = 0;
int len;
int perror = 1;
rc->cfd = cfd;
/* 1a. Send server version */
stream_write(cfd, vbuf, strlen(vbuf));
/* 1b. Read client version */
len = read(cfd, buf, sizeof(buf));
/* 2a. Send security type */
buf[0] = 1;
#ifndef NO_OPENSSL
if (rc->password)
buf[1] = SECURITY_TYPE_VNC_AUTH;
else
buf[1] = SECURITY_TYPE_NONE;
#else
buf[1] = SECURITY_TYPE_NONE;
#endif
stream_write(cfd, buf, 2);
/* 2b. Read agreed security type */
len = stream_read(cfd, buf, 1);
/* 2c. Do VNC authentication */
switch (buf[0]) {
case SECURITY_TYPE_NONE:
sres = 0;
break;
case SECURITY_TYPE_VNC_AUTH:
/*
* The client encrypts the challenge with DES, using a password
* supplied by the user as the key.
* To form the key, the password is truncated to
* eight characters, or padded with null bytes on the right.
* The client then sends the resulting 16-bytes response.
*/
#ifndef NO_OPENSSL
strncpy(keystr, rc->password, PASSWD_LENGTH);
/* VNC clients encrypts the challenge with all the bit fields
* in each byte of the password mirrored.
* Here we flip each byte of the keystr.
*/
for (i = 0; i < PASSWD_LENGTH; i++) {
keystr[i] = (keystr[i] & 0xF0) >> 4
| (keystr[i] & 0x0F) << 4;
keystr[i] = (keystr[i] & 0xCC) >> 2
| (keystr[i] & 0x33) << 2;
keystr[i] = (keystr[i] & 0xAA) >> 1
| (keystr[i] & 0x55) << 1;
}
/* Initialize a 16-byte random challenge */
arc4random_buf(challenge, sizeof(challenge));
stream_write(cfd, challenge, AUTH_LENGTH);
/* Receive the 16-byte challenge response */
stream_read(cfd, buf, AUTH_LENGTH);
memcpy(crypt_expected, challenge, AUTH_LENGTH);
/* Encrypt the Challenge with DES */
DES_set_key((const_DES_cblock *)keystr, &ks);
DES_ecb_encrypt((const_DES_cblock *)challenge,
(const_DES_cblock *)crypt_expected,
&ks, DES_ENCRYPT);
DES_ecb_encrypt((const_DES_cblock *)(challenge + PASSWD_LENGTH),
(const_DES_cblock *)(crypt_expected +
PASSWD_LENGTH),
&ks, DES_ENCRYPT);
if (memcmp(crypt_expected, buf, AUTH_LENGTH) != 0) {
message = "Auth Failed: Invalid Password.";
sres = htonl(1);
} else
sres = 0;
#else
sres = 0;
WPRINTF(("Auth not supported, no OpenSSL in your system"));
#endif
break;
}
/* 2d. Write back a status */
stream_write(cfd, &sres, 4);
if (sres) {
be32enc(buf, strlen(message));
stream_write(cfd, buf, 4);
stream_write(cfd, message, strlen(message));
goto done;
}
/* 3a. Read client shared-flag byte */
len = stream_read(cfd, buf, 1);
/* 4a. Write server-init info */
rfb_send_server_init_msg(cfd);
if (!rc->zbuf) {
rc->zbuf = malloc(RFB_ZLIB_BUFSZ + 16);
assert(rc->zbuf != NULL);
}
rfb_send_screen(rc, cfd, 1);
perror = pthread_create(&tid, NULL, rfb_wr_thr, rc);
if (perror == 0)
pthread_set_name_np(tid, "rfbout");
/* Now read in client requests. 1st byte identifies type */
for (;;) {
len = read(cfd, buf, 1);
if (len <= 0) {
DPRINTF(("rfb client exiting\r\n"));
break;
}
switch (buf[0]) {
case 0:
rfb_recv_set_pixfmt_msg(rc, cfd);
break;
case 2:
rfb_recv_set_encodings_msg(rc, cfd);
break;
case 3:
rfb_recv_update_msg(rc, cfd, 1);
break;
case 4:
rfb_recv_key_msg(rc, cfd);
break;
case 5:
rfb_recv_ptr_msg(rc, cfd);
break;
case 6:
rfb_recv_cuttext_msg(rc, cfd);
break;
default:
WPRINTF(("rfb unknown cli-code %d!\n", buf[0] & 0xff));
goto done;
}
}
done:
rc->cfd = -1;
if (perror == 0)
pthread_join(tid, NULL);
if (rc->enc_zlib_ok)
deflateEnd(&rc->zstream);
}
static void *
rfb_thr(void *arg)
{
struct rfb_softc *rc;
sigset_t set;
int cfd;
rc = arg;
sigemptyset(&set);
sigaddset(&set, SIGPIPE);
if (pthread_sigmask(SIG_BLOCK, &set, NULL) != 0) {
perror("pthread_sigmask");
return (NULL);
}
for (;;) {
rc->enc_raw_ok = false;
rc->enc_zlib_ok = false;
rc->enc_resize_ok = false;
cfd = accept(rc->sfd, NULL, NULL);
if (rc->conn_wait) {
pthread_mutex_lock(&rc->mtx);
pthread_cond_signal(&rc->cond);
pthread_mutex_unlock(&rc->mtx);
rc->conn_wait = 0;
}
rfb_handle(rc, cfd);
close(cfd);
}
/* NOTREACHED */
return (NULL);
}
static int
sse42_supported(void)
{
u_int cpu_registers[4], ecx;
do_cpuid(1, cpu_registers);
ecx = cpu_registers[2];
return ((ecx & CPUID2_SSE42) != 0);
}
int
rfb_init(char *hostname, int port, int wait, char *password)
{
int e;
char servname[6];
struct rfb_softc *rc;
struct addrinfo *ai;
struct addrinfo hints;
int on = 1;
#ifndef WITHOUT_CAPSICUM
cap_rights_t rights;
#endif
rc = calloc(1, sizeof(struct rfb_softc));
rc->crc = calloc(howmany(RFB_MAX_WIDTH * RFB_MAX_HEIGHT, 32),
sizeof(uint32_t));
rc->crc_tmp = calloc(howmany(RFB_MAX_WIDTH * RFB_MAX_HEIGHT, 32),
sizeof(uint32_t));
rc->crc_width = RFB_MAX_WIDTH;
rc->crc_height = RFB_MAX_HEIGHT;
rc->password = password;
snprintf(servname, sizeof(servname), "%d", port ? port : 5900);
if (!hostname || strlen(hostname) == 0)
#if defined(INET)
hostname = "127.0.0.1";
#elif defined(INET6)
hostname = "[::1]";
#endif
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV | AI_PASSIVE;
if ((e = getaddrinfo(hostname, servname, &hints, &ai)) != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(e));
return(-1);
}
rc->sfd = socket(ai->ai_family, ai->ai_socktype, 0);
if (rc->sfd < 0) {
perror("socket");
freeaddrinfo(ai);
return (-1);
}
setsockopt(rc->sfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
if (bind(rc->sfd, ai->ai_addr, ai->ai_addrlen) < 0) {
perror("bind");
freeaddrinfo(ai);
return (-1);
}
if (listen(rc->sfd, 1) < 0) {
perror("listen");
freeaddrinfo(ai);
return (-1);
}
#ifndef WITHOUT_CAPSICUM
cap_rights_init(&rights, CAP_ACCEPT, CAP_EVENT, CAP_READ, CAP_WRITE);
if (caph_rights_limit(rc->sfd, &rights) == -1)
errx(EX_OSERR, "Unable to apply rights for sandbox");
#endif
rc->hw_crc = sse42_supported();
rc->conn_wait = wait;
if (wait) {
pthread_mutex_init(&rc->mtx, NULL);
pthread_cond_init(&rc->cond, NULL);
}
pthread_create(&rc->tid, NULL, rfb_thr, rc);
pthread_set_name_np(rc->tid, "rfb");
if (wait) {
DPRINTF(("Waiting for rfb client...\n"));
pthread_mutex_lock(&rc->mtx);
pthread_cond_wait(&rc->cond, &rc->mtx);
pthread_mutex_unlock(&rc->mtx);
}
freeaddrinfo(ai);
return (0);
}
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