/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2015 Tycho Nightingale * 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 __FBSDID("$FreeBSD$"); #include #ifndef WITHOUT_CAPSICUM #include #endif #include #include #include #include #include #include #include #include #include #include #include #ifndef WITHOUT_CAPSICUM #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include "bhyvegc.h" #include "debug.h" #include "console.h" #include "rfb.h" #include "sockstream.h" #ifndef NO_OPENSSL #include #endif /* Delays in microseconds */ #define CFD_SEL_DELAY 10000 #define SCREEN_REFRESH_DELAY 33300 /* 30Hz */ #define SCREEN_POLL_DELAY (SCREEN_REFRESH_DELAY / 2) static int rfb_debug = 0; #define DPRINTF(params) if (rfb_debug) PRINTLN params #define WPRINTF(params) PRINTLN params #define VERSION_LENGTH 12 #define AUTH_LENGTH 16 #define PASSWD_LENGTH 8 /* Protocol versions */ #define CVERS_3_3 '3' #define CVERS_3_7 '7' #define CVERS_3_8 '8' /* Client-to-server msg types */ #define CS_SET_PIXEL_FORMAT 0 #define CS_SET_ENCODINGS 2 #define CS_UPDATE_MSG 3 #define CS_KEY_EVENT 4 #define CS_POINTER_EVENT 5 #define CS_CUT_TEXT 6 #define CS_MSG_CLIENT_QEMU 255 #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; const char *password; bool enc_raw_ok; bool enc_zlib_ok; bool enc_resize_ok; bool enc_extkeyevent_ok; bool enc_extkeyevent_send; z_stream zstream; uint8_t *zbuf; int zbuflen; int conn_wait; int wrcount; atomic_bool sending; atomic_bool pending; atomic_bool update_all; atomic_bool input_detected; 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_ENCODING_EXT_KEYEVENT -258 #define RFB_CLIENTMSG_EXT_KEYEVENT 0 #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 sym; }; struct rfb_client_msg { uint8_t type; uint8_t subtype; }; struct rfb_extended_key_msg { uint8_t type; uint8_t subtype; uint16_t down; uint32_t sym; 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.pixfmt.pad[0] = 0; sinfo.pixfmt.pad[1] = 0; sinfo.pixfmt.pad[2] = 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_send_extended_keyevent_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_EXT_KEYEVENT); stream_write(cfd, &srect_hdr, sizeof(struct rfb_srvr_rect_hdr)); } static void rfb_recv_set_pixfmt_msg(struct rfb_softc *rc __unused, int cfd) { struct rfb_pixfmt_msg pixfmt_msg; (void)stream_read(cfd, (uint8_t *)&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; (void)stream_read(cfd, (uint8_t *)&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: if (!rc->enc_zlib_ok) { deflateInit(&rc->zstream, Z_BEST_SPEED); rc->enc_zlib_ok = true; } break; case RFB_ENCODING_RESIZE: rc->enc_resize_ok = true; break; case RFB_ENCODING_EXT_KEYEVENT: rc->enc_extkeyevent_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_update_header(struct rfb_softc *rc __unused, int cfd, int numrects) { struct rfb_srvr_updt_msg supdt_msg; supdt_msg.type = 0; supdt_msg.pad = 0; supdt_msg.numrects = htons(numrects); return stream_write(cfd, &supdt_msg, sizeof(struct rfb_srvr_updt_msg)); } 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_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. */ /* 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", 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", 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) { 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; bool expected; /* Return if another thread sending */ expected = false; if (atomic_compare_exchange_strong(&rc->sending, &expected, true) == false) return (1); retval = 1; /* Updates require a preceding update request */ if (atomic_exchange(&rc->pending, false) == false) goto done; console_refresh(); gc_image = console_get_image(); /* Clear old CRC values when the size changes */ if (rc->crc_width != gc_image->width || rc->crc_height != gc_image->height) { memset(rc->crc, 0, sizeof(uint32_t) * howmany(RFB_MAX_WIDTH, PIX_PER_CELL) * howmany(RFB_MAX_HEIGHT, PIX_PER_CELL)); rc->crc_width = gc_image->width; rc->crc_height = gc_image->height; } /* A size update counts as an update in itself */ if (rc->width != gc_image->width || rc->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); rc->update_all = true; goto done; } } if (atomic_exchange(&rc->update_all, false) == true) { 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. */ 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; } } } } /* * We only send the update if there are changes. * Restore the pending flag since it was unconditionally cleared * above. */ if (!changes) { rc->pending = true; goto done; } /* 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; } rfb_send_update_header(rc, cfd, changes); /* 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; } } } done: rc->sending = false; return (retval); } static void rfb_recv_update_msg(struct rfb_softc *rc, int cfd) { struct rfb_updt_msg updt_msg; (void)stream_read(cfd, (uint8_t *)&updt_msg + 1 , sizeof(updt_msg) - 1); if (rc->enc_extkeyevent_ok && (!rc->enc_extkeyevent_send)) { rfb_send_extended_keyevent_update_msg(rc, cfd); rc->enc_extkeyevent_send = true; } rc->pending = true; if (!updt_msg.incremental) rc->update_all = true; } static void rfb_recv_key_msg(struct rfb_softc *rc, int cfd) { struct rfb_key_msg key_msg; (void)stream_read(cfd, (uint8_t *)&key_msg + 1, sizeof(key_msg) - 1); console_key_event(key_msg.down, htonl(key_msg.sym), htonl(0)); rc->input_detected = true; } static void rfb_recv_client_msg(struct rfb_softc *rc, int cfd) { struct rfb_client_msg client_msg; struct rfb_extended_key_msg extkey_msg; (void)stream_read(cfd, (uint8_t *)&client_msg + 1, sizeof(client_msg) - 1); if (client_msg.subtype == RFB_CLIENTMSG_EXT_KEYEVENT) { (void)stream_read(cfd, (uint8_t *)&extkey_msg + 2, sizeof(extkey_msg) - 2); console_key_event((int)extkey_msg.down, htonl(extkey_msg.sym), htonl(extkey_msg.code)); rc->input_detected = true; } } static void rfb_recv_ptr_msg(struct rfb_softc *rc, int cfd) { struct rfb_ptr_msg ptr_msg; (void)stream_read(cfd, (uint8_t *)&ptr_msg + 1, sizeof(ptr_msg) - 1); console_ptr_event(ptr_msg.button, htons(ptr_msg.x), htons(ptr_msg.y)); rc->input_detected = true; } static void rfb_recv_cuttext_msg(struct rfb_softc *rc __unused, int cfd) { struct rfb_cuttext_msg ct_msg; unsigned char buf[32]; int len; len = stream_read(cfd, (uint8_t *)&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 = CFD_SEL_DELAY; 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 >= SCREEN_POLL_DELAY) { bool input; prev_tv.tv_sec = tv.tv_sec; prev_tv.tv_usec = tv.tv_usec; input = atomic_exchange(&rc->input_detected, false); /* * Refresh the screen on every second trip through the loop, * or if keyboard/mouse input has been detected. */ if ((++rc->wrcount & 1) || input) { if (rfb_send_screen(rc, cfd) <= 0) { return (NULL); } } } else { /* sleep */ usleep(SCREEN_POLL_DELAY - tdiff); } } return (NULL); } static void rfb_handle(struct rfb_softc *rc, int cfd) { const char *vbuf = "RFB 003.008\n"; unsigned char buf[80]; unsigned const char *message; #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 uint8_t client_ver; uint8_t auth_type; 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 = stream_read(cfd, buf, VERSION_LENGTH); if (len != VERSION_LENGTH || strncmp(vbuf, buf, VERSION_LENGTH - 2) != 0) { goto done; } client_ver = buf[VERSION_LENGTH - 2]; if (client_ver != CVERS_3_8 && client_ver != CVERS_3_7) { /* only recognize 3.3, 3.7 & 3.8. Others dflt to 3.3 */ client_ver = CVERS_3_3; } /* 2a. Send security type */ buf[0] = 1; /* In versions 3.7 & 3.8, it's 2-way handshake */ /* For version 3.3, server says what the authentication type must be */ #ifndef NO_OPENSSL if (rc->password) { auth_type = SECURITY_TYPE_VNC_AUTH; } else { auth_type = SECURITY_TYPE_NONE; } #else auth_type = SECURITY_TYPE_NONE; #endif switch (client_ver) { case CVERS_3_7: case CVERS_3_8: buf[0] = 1; buf[1] = auth_type; stream_write(cfd, buf, 2); /* 2b. Read agreed security type */ len = stream_read(cfd, buf, 1); if (buf[0] != auth_type) { /* deny */ sres = htonl(1); message = "Auth failed: authentication type mismatch"; goto report_and_done; } break; case CVERS_3_3: default: be32enc(buf, auth_type); stream_write(cfd, buf, 4); break; } /* 2c. Do VNC authentication */ switch (auth_type) { case SECURITY_TYPE_NONE: 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 = htonl(1); WPRINTF(("Auth not supported, no OpenSSL in your system")); #endif break; } switch (client_ver) { case CVERS_3_7: case CVERS_3_8: report_and_done: /* 2d. Write back a status */ stream_write(cfd, &sres, 4); if (sres) { /* 3.7 does not want string explaining cause */ if (client_ver == CVERS_3_8) { be32enc(buf, strlen(message)); stream_write(cfd, buf, 4); stream_write(cfd, message, strlen(message)); } goto done; } break; case CVERS_3_3: default: /* for VNC auth case send status */ if (auth_type == SECURITY_TYPE_VNC_AUTH) { /* 2d. Write back a status */ stream_write(cfd, &sres, 4); } if (sres) { goto done; } break; } /* 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); } 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")); break; } switch (buf[0]) { case CS_SET_PIXEL_FORMAT: rfb_recv_set_pixfmt_msg(rc, cfd); break; case CS_SET_ENCODINGS: rfb_recv_set_encodings_msg(rc, cfd); break; case CS_UPDATE_MSG: rfb_recv_update_msg(rc, cfd); break; case CS_KEY_EVENT: rfb_recv_key_msg(rc, cfd); break; case CS_POINTER_EVENT: rfb_recv_ptr_msg(rc, cfd); break; case CS_CUT_TEXT: rfb_recv_cuttext_msg(rc, cfd); break; case CS_MSG_CLIENT_QEMU: rfb_recv_client_msg(rc, cfd); break; default: WPRINTF(("rfb unknown cli-code %d!", 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; rc->enc_extkeyevent_ok = false; rc->enc_extkeyevent_send = 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(const char *hostname, int port, int wait, const char *password) { int e; char servname[6]; struct rfb_softc *rc; struct addrinfo *ai = NULL; struct addrinfo hints; int on = 1; int cnt; #ifndef WITHOUT_CAPSICUM cap_rights_t rights; #endif rc = calloc(1, sizeof(struct rfb_softc)); cnt = howmany(RFB_MAX_WIDTH, PIX_PER_CELL) * howmany(RFB_MAX_HEIGHT, PIX_PER_CELL); rc->crc = calloc(cnt, sizeof(uint32_t)); rc->crc_tmp = calloc(cnt, sizeof(uint32_t)); rc->crc_width = RFB_MAX_WIDTH; rc->crc_height = RFB_MAX_HEIGHT; rc->sfd = -1; 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) { EPRINTLN("getaddrinfo: %s", gai_strerror(e)); goto error; } rc->sfd = socket(ai->ai_family, ai->ai_socktype, 0); if (rc->sfd < 0) { perror("socket"); goto error; } setsockopt(rc->sfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); if (bind(rc->sfd, ai->ai_addr, ai->ai_addrlen) < 0) { perror("bind"); goto error; } if (listen(rc->sfd, 1) < 0) { perror("listen"); goto error; } #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...")); pthread_mutex_lock(&rc->mtx); pthread_cond_wait(&rc->cond, &rc->mtx); pthread_mutex_unlock(&rc->mtx); DPRINTF(("rfb client connected")); } freeaddrinfo(ai); return (0); error: if (ai != NULL) freeaddrinfo(ai); if (rc->sfd != -1) close(rc->sfd); free(rc->crc); free(rc->crc_tmp); free(rc); return (-1); }