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4346 lines
102 KiB
4346 lines
102 KiB
/*
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Copyright (C) 2002-2010 Karl J. Runge <runge@karlrunge.com>
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All rights reserved.
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This file is part of x11vnc.
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x11vnc 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 (at
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your option) any later version.
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x11vnc 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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You should have received a copy of the GNU General Public License
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along with x11vnc; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA
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or see <http://www.gnu.org/licenses/>.
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In addition, as a special exception, Karl J. Runge
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gives permission to link the code of its release of x11vnc with the
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OpenSSL project's "OpenSSL" library (or with modified versions of it
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that use the same license as the "OpenSSL" library), and distribute
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the linked executables. You must obey the GNU General Public License
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in all respects for all of the code used other than "OpenSSL". If you
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modify this file, you may extend this exception to your version of the
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file, but you are not obligated to do so. If you do not wish to do
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so, delete this exception statement from your version.
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*/
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/* -- sslhelper.c -- */
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#include "x11vnc.h"
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#include "inet.h"
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#include "cleanup.h"
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#include "screen.h"
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#include "scan.h"
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#include "connections.h"
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#include "sslcmds.h"
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#include "unixpw.h"
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#include "user.h"
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#define OPENSSL_INETD 1
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#define OPENSSL_VNC 2
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#define OPENSSL_VNC6 3
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#define OPENSSL_HTTPS 4
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#define OPENSSL_HTTPS6 5
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#define OPENSSL_REVERSE 6
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#define DO_DH 0
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#if LIBVNCSERVER_HAVE_FORK
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#if LIBVNCSERVER_HAVE_SYS_WAIT_H && LIBVNCSERVER_HAVE_WAITPID
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#define FORK_OK
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#endif
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#endif
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int openssl_sock = -1;
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int openssl_sock6 = -1;
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int openssl_port_num = 0;
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int https_sock = -1;
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int https_sock6 = -1;
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pid_t openssl_last_helper_pid = 0;
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char *openssl_last_ip = NULL;
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static char *certret = NULL;
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static int certret_fd = -1;
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static mode_t omode;
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char *certret_str = NULL;
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static char *dhret = NULL;
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static int dhret_fd = -1;
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char *dhret_str = NULL;
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char *new_dh_params = NULL;
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void raw_xfer(int csock, int s_in, int s_out);
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/* openssl(1) pem related functions: */
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char *get_saved_pem(char *string, int create);
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char *find_openssl_bin(void);
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char *get_ssl_verify_file(char *str_in);
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char *create_tmp_pem(char *path, int prompt);
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static char *get_input(char *tag, char **in);
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char *get_saved_pem(char *save, int create) {
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char *s = NULL, *path, *cdir, *tmp;
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int prompt = 0, len;
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struct stat sbuf;
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if (! save) {
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rfbLog("get_saved_pem: save string is null.\n");
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clean_up_exit(1);
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}
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if (strstr(save, "SAVE_PROMPT") == save) {
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prompt = 1;
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s = save + strlen("SAVE_PROMPT");
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} else if (strstr(save, "SAVE_NOPROMPT") == save) {
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set_env("GENCERT_NOPROMPT", "1");
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s = save + strlen("SAVE_NOPROMPT");
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} else if (strstr(save, "SAVE") == save) {
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s = save + strlen("SAVE");
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} else {
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rfbLog("get_saved_pem: invalid save string: %s\n", save);
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clean_up_exit(1);
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}
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if (strchr(s, '/')) {
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rfbLog("get_saved_pem: invalid save string: %s\n", s);
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clean_up_exit(1);
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}
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cdir = get_Cert_dir(NULL, &tmp);
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if (! cdir || ! tmp) {
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rfbLog("get_saved_pem: could not find Cert dir.\n");
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clean_up_exit(1);
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}
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len = strlen(cdir) + strlen("/server.pem") + strlen(s) + 1;
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path = (char *) malloc(len);
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sprintf(path, "%s/server%s.pem", cdir, s);
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if (stat(path, &sbuf) != 0) {
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char *new_name = NULL;
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if (create) {
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if (inetd || opts_bg) {
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set_env("GENCERT_NOPROMPT", "1");
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}
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new_name = create_tmp_pem(path, prompt);
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if (!getenv("X11VNC_SSL_NO_PASSPHRASE") && !inetd && !opts_bg) {
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sslEncKey(new_name, 0);
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}
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}
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return new_name;
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}
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if (! quiet) {
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char line[1024];
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int on = 0;
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FILE *in = fopen(path, "r");
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if (in != NULL) {
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rfbLog("\n");
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rfbLog("Using SSL Certificate:\n");
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fprintf(stderr, "\n");
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while (fgets(line, 1024, in) != NULL) {
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if (strstr(line, "BEGIN CERTIFICATE")) {
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on = 1;
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}
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if (on) {
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fprintf(stderr, "%s", line);
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}
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if (strstr(line, "END CERTIFICATE")) {
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on = 0;
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}
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if (strstr(line, "PRIVATE KEY")) {
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on = 0;
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}
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}
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fprintf(stderr, "\n");
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fclose(in);
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}
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}
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return strdup(path);
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}
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static char *get_input(char *tag, char **in) {
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char line[1024], *str;
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if (! tag || ! in || ! *in) {
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return NULL;
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}
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fprintf(stderr, "%s:\n [%s] ", tag, *in);
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if (fgets(line, 1024, stdin) == NULL) {
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rfbLog("could not read stdin!\n");
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rfbLogPerror("fgets");
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clean_up_exit(1);
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}
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if ((str = strrchr(line, '\n')) != NULL) {
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*str = '\0';
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}
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str = lblanks(line);
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if (!strcmp(str, "")) {
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return *in;
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} else {
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return strdup(line);
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}
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}
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char *find_openssl_bin(void) {
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char *path, *exe, *p, *gp;
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struct stat sbuf;
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int found_openssl = 0;
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char extra[] = ":/usr/bin:/bin:/usr/sbin:/usr/local/bin"
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":/usr/local/sbin:/usr/sfw/bin";
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gp = getenv("PATH");
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if (! gp) {
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fprintf(stderr, "could not find openssl(1) program in PATH. (null)\n");
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return NULL;
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}
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path = (char *) malloc(strlen(gp) + strlen(extra) + 1);
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strcpy(path, gp);
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strcat(path, extra);
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/* find openssl binary: */
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exe = (char *) malloc(strlen(path) + strlen("/openssl") + 1);
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p = strtok(path, ":");
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while (p) {
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sprintf(exe, "%s/openssl", p);
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if (stat(exe, &sbuf) == 0) {
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if (! S_ISDIR(sbuf.st_mode)) {
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found_openssl = 1;
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break;
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}
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}
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p = strtok(NULL, ":");
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}
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free(path);
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if (! found_openssl) {
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fprintf(stderr, "could not find openssl(1) program in PATH.\n");
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fprintf(stderr, "PATH=%s\n", gp);
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fprintf(stderr, "(also checked: %s)\n", extra);
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return NULL;
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}
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return exe;
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}
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/* uses /usr/bin/openssl to create a tmp cert */
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char *create_tmp_pem(char *pathin, int prompt) {
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pid_t pid, pidw;
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FILE *in, *out;
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char cnf[] = "/tmp/x11vnc-cnf.XXXXXX";
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char pem[] = "/tmp/x11vnc-pem.XXXXXX";
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char str[8*1024], line[1024], *exe;
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int cnf_fd, pem_fd, status, show_cert = 1;
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char *days;
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char *C, *L, *OU, *O, *CN, *EM;
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char tmpl[] =
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"[ req ]\n"
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"prompt = no\n"
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"default_bits = 2048\n"
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"encrypt_key = yes\n"
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"distinguished_name = req_dn\n"
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"x509_extensions = cert_type\n"
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"\n"
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"[ req_dn ]\n"
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"countryName=%s\n"
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"localityName=%s\n"
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"organizationalUnitName=%s\n"
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"organizationName=%s\n"
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"commonName=%s\n"
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"emailAddress=%s\n"
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"\n"
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"[ cert_type ]\n"
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"nsCertType = server\n"
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;
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C = strdup("AU");
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L = strdup(UT.sysname ? UT.sysname : "unknown-os");
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snprintf(line, 1024, "%s-%f", UT.nodename ? UT.nodename :
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"unknown-node", dnow());
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line[1024-1] = '\0';
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OU = strdup(line);
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O = strdup("x11vnc");
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if (pathin) {
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snprintf(line, 1024, "x11vnc-SELF-SIGNED-CERT-%d", getpid());
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} else {
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snprintf(line, 1024, "x11vnc-SELF-SIGNED-TEMPORARY-CERT-%d",
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getpid());
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}
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line[1024-1] = '\0';
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CN = strdup(line);
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EM = strdup("x11vnc@server.nowhere");
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/* ssl */
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if (no_external_cmds || !cmd_ok("ssl")) {
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rfbLog("create_tmp_pem: cannot run external commands.\n");
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return NULL;
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}
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rfbLog("\n");
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if (pathin) {
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rfbLog("Creating a self-signed PEM certificate...\n");
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} else {
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rfbLog("Creating a temporary, self-signed PEM certificate...\n");
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}
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rfbLog("\n");
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rfbLog("This will NOT prevent Man-In-The-Middle attacks UNLESS you\n");
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rfbLog("get the certificate information to the VNC viewers SSL\n");
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rfbLog("tunnel configuration or you take the extra steps to sign it\n");
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rfbLog("with a CA key. However, it will prevent passive network\n");
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rfbLog("sniffing.\n");
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rfbLog("\n");
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rfbLog("The cert inside -----BEGIN CERTIFICATE-----\n");
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rfbLog(" ....\n");
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rfbLog(" -----END CERTIFICATE-----\n");
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rfbLog("printed below may be used on the VNC viewer-side to\n");
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rfbLog("authenticate this server for this session. See the -ssl\n");
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rfbLog("help output and the FAQ for how to create a permanent\n");
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rfbLog("server certificate.\n");
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rfbLog("\n");
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exe = find_openssl_bin();
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if (! exe) {
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return NULL;
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}
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/* create template file with our made up stuff: */
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if (prompt) {
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fprintf(stderr, "\nReply to the following prompts to set"
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" your Certificate parameters.\n");
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fprintf(stderr, "(press Enter to accept the default in [...], "
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"or type in the value you want)\n\n");
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C = get_input("CountryName", &C);
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L = get_input("LocalityName", &L);
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OU = get_input("OrganizationalUnitName", &OU);
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O = get_input("OrganizationalName", &O);
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CN = get_input("CommonName", &CN);
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EM = get_input("EmailAddress", &EM);
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}
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sprintf(str, tmpl, C, L, OU, O, CN, EM);
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cnf_fd = mkstemp(cnf);
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if (cnf_fd < 0) {
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return NULL;
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}
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pem_fd = mkstemp(pem);
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if (pem_fd < 0) {
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close(cnf_fd);
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return NULL;
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}
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close(pem_fd);
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write(cnf_fd, str, strlen(str));
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close(cnf_fd);
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if (pathin) {
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days = "365";
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} else {
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days = "30";
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}
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#ifndef FORK_OK
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rfbLog("not compiled with fork(2)\n");
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clean_up_exit(1);
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#else
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/* make RSA key */
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pid = fork();
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if (pid < 0) {
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return NULL;
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} else if (pid == 0) {
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int i;
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for (i=0; i<256; i++) {
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close(i);
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}
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execlp(exe, exe, "req", "-new", "-x509", "-nodes",
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"-days", days, "-config", cnf, "-out", pem,
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"-keyout", pem, (char *)0);
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exit(1);
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}
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pidw = waitpid(pid, &status, 0);
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if (pidw != pid) {
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return NULL;
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}
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if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
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;
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} else {
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return NULL;
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}
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#if DO_DH
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/* make DH parameters */
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pid = fork();
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if (pid < 0) {
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return NULL;
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} else if (pid == 0) {
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int i;
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for (i=0; i<256; i++) {
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close(i);
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}
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/* rather slow at 1024 */
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execlp(exe, exe, "dhparam", "-out", cnf, "512", (char *)0);
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exit(1);
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}
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pidw = waitpid(pid, &status, 0);
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if (pidw != pid) {
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return NULL;
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}
|
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if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
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;
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} else {
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return NULL;
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}
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/* append result: */
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in = fopen(cnf, "r");
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if (in == NULL) {
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return NULL;
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}
|
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out = fopen(pem, "a");
|
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if (out == NULL) {
|
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fclose(in);
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return NULL;
|
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}
|
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while (fgets(line, 1024, in) != NULL) {
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fprintf(out, "%s", line);
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|
}
|
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fclose(in);
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fclose(out);
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#endif
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|
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#endif /* FORK_OK */
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|
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unlink(cnf);
|
|
free(exe);
|
|
|
|
if (pathin != NULL) {
|
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char *q, *pathcrt = strdup(pathin);
|
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FILE *crt = NULL;
|
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int on = 0;
|
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|
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q = strrchr(pathcrt, '/');
|
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if (q) {
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q = strstr(q, ".pem");
|
|
if (q) {
|
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*(q+1) = 'c';
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*(q+2) = 'r';
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*(q+3) = 't';
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crt = fopen(pathcrt, "w");
|
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}
|
|
}
|
|
if (crt == NULL) {
|
|
rfbLog("could not open: %s\n", pathcrt);
|
|
rfbLogPerror("fopen");
|
|
return NULL;
|
|
}
|
|
|
|
out = fopen(pathin, "w");
|
|
chmod(pathin, 0600);
|
|
if (out == NULL) {
|
|
rfbLog("could not open: %s\n", pathin);
|
|
rfbLogPerror("fopen");
|
|
fclose(crt);
|
|
return NULL;
|
|
}
|
|
|
|
in = fopen(pem, "r");
|
|
if (in == NULL) {
|
|
rfbLog("could not open: %s\n", pem);
|
|
rfbLogPerror("fopen");
|
|
fclose(out);
|
|
fclose(crt);
|
|
unlink(pathin);
|
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unlink(pathcrt);
|
|
return NULL;
|
|
}
|
|
while (fgets(line, 1024, in) != NULL) {
|
|
if (strstr(line, "BEGIN CERTIFICATE")) {
|
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on = 1;
|
|
}
|
|
fprintf(out, "%s", line);
|
|
if (on) {
|
|
fprintf(crt, "%s", line);
|
|
if (!quiet) {
|
|
fprintf(stderr, "%s", line);
|
|
}
|
|
}
|
|
if (strstr(line, "END CERTIFICATE")) {
|
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on = 0;
|
|
}
|
|
if (strstr(line, "PRIVATE KEY")) {
|
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on = 0;
|
|
}
|
|
}
|
|
fclose(in);
|
|
fclose(out);
|
|
fclose(crt);
|
|
}
|
|
|
|
if (show_cert) {
|
|
exe = find_openssl_bin();
|
|
if (!exe) {
|
|
exe = strdup("openssl");
|
|
}
|
|
if (strlen(pem) + strlen(exe) < 4000) {
|
|
char cmd[5000];
|
|
if (inetd) {
|
|
sprintf(cmd, "%s x509 -text -in '%s' 1>&2", exe, pem);
|
|
} else {
|
|
sprintf(cmd, "%s x509 -text -in '%s'", exe, pem);
|
|
}
|
|
fprintf(stderr, "\n");
|
|
system(cmd);
|
|
fprintf(stderr, "\n");
|
|
}
|
|
free(exe);
|
|
}
|
|
|
|
if (pathin) {
|
|
unlink(pem);
|
|
return strdup(pathin);
|
|
} else {
|
|
return strdup(pem);
|
|
}
|
|
}
|
|
|
|
static int appendfile(FILE *out, char *infile) {
|
|
char line[1024];
|
|
FILE *in;
|
|
|
|
if (! infile) {
|
|
rfbLog("appendfile: null infile.\n");
|
|
return 0;
|
|
}
|
|
if (! out) {
|
|
rfbLog("appendfile: null out handle.\n");
|
|
return 0;
|
|
}
|
|
|
|
in = fopen(infile, "r");
|
|
|
|
if (in == NULL) {
|
|
rfbLog("appendfile: %s\n", infile);
|
|
rfbLogPerror("fopen");
|
|
return 0;
|
|
}
|
|
|
|
while (fgets(line, 1024, in) != NULL) {
|
|
fprintf(out, "%s", line);
|
|
}
|
|
fclose(in);
|
|
return 1;
|
|
}
|
|
|
|
char *get_ssl_verify_file(char *str_in) {
|
|
char *p, *str, *cdir, *tmp;
|
|
char *tfile, *tfile2;
|
|
FILE *file;
|
|
struct stat sbuf;
|
|
int count = 0, fd;
|
|
|
|
if (! str_in) {
|
|
rfbLog("get_ssl_verify_file: no filename\n");
|
|
exit(1);
|
|
}
|
|
|
|
if (stat(str_in, &sbuf) == 0) {
|
|
/* assume he knows what he is doing. */
|
|
return str_in;
|
|
}
|
|
|
|
cdir = get_Cert_dir(NULL, &tmp);
|
|
if (! cdir || ! tmp) {
|
|
rfbLog("get_ssl_verify_file: invalid cert-dir.\n");
|
|
exit(1);
|
|
}
|
|
|
|
tfile = (char *) malloc(strlen(tmp) + 1024);
|
|
tfile2 = (char *) malloc(strlen(tmp) + 1024);
|
|
|
|
sprintf(tfile, "%s/sslverify-tmp-load-%d.crts.XXXXXX", tmp, getpid());
|
|
|
|
fd = mkstemp(tfile);
|
|
if (fd < 0) {
|
|
rfbLog("get_ssl_verify_file: %s\n", tfile);
|
|
rfbLogPerror("mkstemp");
|
|
exit(1);
|
|
}
|
|
close(fd);
|
|
|
|
file = fopen(tfile, "w");
|
|
chmod(tfile, 0600);
|
|
if (file == NULL) {
|
|
rfbLog("get_ssl_verify_file: %s\n", tfile);
|
|
rfbLogPerror("fopen");
|
|
exit(1);
|
|
}
|
|
|
|
str = strdup(str_in);
|
|
p = strtok(str, ",");
|
|
|
|
while (p) {
|
|
if (!strcmp(p, "CA")) {
|
|
sprintf(tfile2, "%s/CA/cacert.pem", cdir);
|
|
if (! appendfile(file, tfile2)) {
|
|
unlink(tfile);
|
|
exit(1);
|
|
}
|
|
rfbLog("sslverify: loaded %s\n", tfile2);
|
|
count++;
|
|
|
|
} else if (!strcmp(p, "clients")) {
|
|
DIR *dir;
|
|
struct dirent *dp;
|
|
|
|
sprintf(tfile2, "%s/clients", cdir);
|
|
dir = opendir(tfile2);
|
|
if (! dir) {
|
|
rfbLog("get_ssl_verify_file: %s\n", tfile2);
|
|
rfbLogPerror("opendir");
|
|
unlink(tfile);
|
|
exit(1);
|
|
}
|
|
while ( (dp = readdir(dir)) != NULL) {
|
|
char *n = dp->d_name;
|
|
char *q = strstr(n, ".crt");
|
|
|
|
if (! q || strlen(q) != strlen(".crt")) {
|
|
continue;
|
|
}
|
|
if (strlen(n) > 512) {
|
|
continue;
|
|
}
|
|
|
|
sprintf(tfile2, "%s/clients/%s", cdir, n);
|
|
if (! appendfile(file, tfile2)) {
|
|
unlink(tfile);
|
|
exit(1);
|
|
}
|
|
rfbLog("sslverify: loaded %s\n",
|
|
tfile2);
|
|
count++;
|
|
}
|
|
closedir(dir);
|
|
|
|
} else {
|
|
if (strlen(p) > 512) {
|
|
unlink(tfile);
|
|
exit(1);
|
|
}
|
|
sprintf(tfile2, "%s/clients/%s.crt", cdir, p);
|
|
if (stat(tfile2, &sbuf) != 0) {
|
|
sprintf(tfile2, "%s/clients/%s", cdir, p);
|
|
}
|
|
if (! appendfile(file, tfile2)) {
|
|
unlink(tfile);
|
|
exit(1);
|
|
}
|
|
rfbLog("sslverify: loaded %s\n", tfile2);
|
|
count++;
|
|
}
|
|
p = strtok(NULL, ",");
|
|
}
|
|
fclose(file);
|
|
free(tfile2);
|
|
free(str);
|
|
|
|
rfbLog("sslverify: using %d client certs in\n", count);
|
|
rfbLog("sslverify: %s\n", tfile);
|
|
|
|
return tfile;
|
|
}
|
|
|
|
int openssl_present(void);
|
|
void openssl_init(int isclient);
|
|
void openssl_port(int restart);
|
|
void https_port(int restart);
|
|
void check_openssl(void);
|
|
void check_https(void);
|
|
void ssl_helper_pid(pid_t pid, int sock);
|
|
void accept_openssl(int mode, int presock);
|
|
|
|
static void lose_ram(void);
|
|
#define ABSIZE 16384
|
|
|
|
static int vencrypt_selected = 0;
|
|
static int anontls_selected = 0;
|
|
|
|
/* to test no openssl libssl */
|
|
#if 0
|
|
#undef LIBVNCSERVER_HAVE_LIBSSL
|
|
#define LIBVNCSERVER_HAVE_LIBSSL 0
|
|
#endif
|
|
|
|
#if !LIBVNCSERVER_HAVE_LIBSSL
|
|
|
|
static void badnews(char *name) {
|
|
use_openssl = 0;
|
|
use_stunnel = 0;
|
|
rfbLog("** %s: not compiled with libssl OpenSSL support **\n", name ? name : "???");
|
|
clean_up_exit(1);
|
|
}
|
|
|
|
int openssl_present(void) {return 0;}
|
|
void openssl_init(int isclient) {badnews("openssl_init");}
|
|
|
|
#define SSL_ERROR_NONE 0
|
|
|
|
static int ssl_init(int s_in, int s_out, int skip_vnc_tls, double last_https) {
|
|
if (enc_str != NULL) {
|
|
return 1;
|
|
}
|
|
badnews("ssl_init");
|
|
return 0;
|
|
}
|
|
|
|
static void ssl_xfer(int csock, int s_in, int s_out, int is_https) {
|
|
if (enc_str != NULL && !strcmp(enc_str, "none")) {
|
|
usleep(250*1000);
|
|
rfbLog("doing '-enc none' raw transfer (no encryption)\n");
|
|
raw_xfer(csock, s_in, s_out);
|
|
} else {
|
|
badnews("ssl_xfer");
|
|
}
|
|
}
|
|
|
|
#else /* LIBVNCSERVER_HAVE_LIBSSL */
|
|
|
|
/*
|
|
* This is because on older systems both zlib.h and ssl.h define
|
|
* 'free_func' nothing we do below (currently) induces an external
|
|
* dependency on 'free_func'.
|
|
*/
|
|
#define free_func my_jolly_little_free_func
|
|
|
|
#include <openssl/ssl.h>
|
|
#include <openssl/err.h>
|
|
#include <openssl/rand.h>
|
|
|
|
static SSL_CTX *ctx = NULL;
|
|
static RSA *rsa_512 = NULL;
|
|
static RSA *rsa_1024 = NULL;
|
|
static SSL *ssl = NULL;
|
|
static X509_STORE *revocation_store = NULL;
|
|
|
|
|
|
static void init_prng(void);
|
|
static void sslerrexit(void);
|
|
static int ssl_init(int s_in, int s_out, int skip_vnc_tls, double last_https);
|
|
static void ssl_xfer(int csock, int s_in, int s_out, int is_https);
|
|
|
|
#ifndef FORK_OK
|
|
void openssl_init(int isclient) {
|
|
rfbLog("openssl_init: fork is not supported. cannot create"
|
|
" ssl helper process.\n");
|
|
clean_up_exit(1);
|
|
}
|
|
int openssl_present(void) {return 0;}
|
|
|
|
#else
|
|
|
|
int openssl_present(void) {return 1;}
|
|
|
|
static void sslerrexit(void) {
|
|
unsigned long err = ERR_get_error();
|
|
|
|
if (err) {
|
|
char str[256];
|
|
ERR_error_string(err, str);
|
|
fprintf(stderr, "ssl error: %s\n", str);
|
|
}
|
|
clean_up_exit(1);
|
|
}
|
|
|
|
static int pem_passwd_callback(char *buf, int size, int rwflag,
|
|
void *userdata) {
|
|
char *q, line[1024];
|
|
|
|
if (! buf) {
|
|
exit(1);
|
|
}
|
|
|
|
fprintf(stderr, "\nA passphrase is needed to unlock an OpenSSL "
|
|
"private key (PEM file).\n");
|
|
fprintf(stderr, "Enter passphrase> ");
|
|
system("stty -echo");
|
|
if(fgets(line, 1024, stdin) == NULL) {
|
|
fprintf(stdout, "\n");
|
|
system("stty echo");
|
|
exit(1);
|
|
}
|
|
system("stty echo");
|
|
fprintf(stdout, "\n\n");
|
|
q = strrchr(line, '\n');
|
|
if (q) {
|
|
*q = '\0';
|
|
}
|
|
line[1024 - 1] = '\0';
|
|
strncpy(buf, line, size);
|
|
buf[size - 1] = '\0';
|
|
|
|
if (0) rwflag = 0; /* compiler warning. */
|
|
if (0) userdata = 0; /* compiler warning. */
|
|
|
|
return strlen(buf);
|
|
}
|
|
|
|
/* based on mod_ssl */
|
|
static int crl_callback(X509_STORE_CTX *callback_ctx) {
|
|
X509_STORE_CTX store_ctx;
|
|
X509_OBJECT obj;
|
|
X509_NAME *subject;
|
|
X509_NAME *issuer;
|
|
X509 *xs;
|
|
X509_CRL *crl;
|
|
X509_REVOKED *revoked;
|
|
EVP_PKEY *pubkey;
|
|
long serial;
|
|
BIO *bio;
|
|
int i, n, rc;
|
|
char *cp, *cp2;
|
|
ASN1_TIME *t;
|
|
|
|
/* Determine certificate ingredients in advance */
|
|
xs = X509_STORE_CTX_get_current_cert(callback_ctx);
|
|
subject = X509_get_subject_name(xs);
|
|
issuer = X509_get_issuer_name(xs);
|
|
|
|
/* Try to retrieve a CRL corresponding to the _subject_ of
|
|
* the current certificate in order to verify it's integrity. */
|
|
memset((char *)&obj, 0, sizeof(obj));
|
|
X509_STORE_CTX_init(&store_ctx, revocation_store, NULL, NULL);
|
|
rc=X509_STORE_get_by_subject(&store_ctx, X509_LU_CRL, subject, &obj);
|
|
X509_STORE_CTX_cleanup(&store_ctx);
|
|
crl=obj.data.crl;
|
|
|
|
if(rc>0 && crl) {
|
|
/* Log information about CRL
|
|
* (A little bit complicated because of ASN.1 and BIOs...) */
|
|
bio=BIO_new(BIO_s_mem());
|
|
BIO_printf(bio, "lastUpdate: ");
|
|
ASN1_UTCTIME_print(bio, X509_CRL_get_lastUpdate(crl));
|
|
BIO_printf(bio, ", nextUpdate: ");
|
|
ASN1_UTCTIME_print(bio, X509_CRL_get_nextUpdate(crl));
|
|
n=BIO_pending(bio);
|
|
cp=malloc(n+1);
|
|
n=BIO_read(bio, cp, n);
|
|
cp[n]='\0';
|
|
BIO_free(bio);
|
|
cp2=X509_NAME_oneline(subject, NULL, 0);
|
|
rfbLog("CA CRL: Issuer: %s, %s\n", cp2, cp);
|
|
OPENSSL_free(cp2);
|
|
free(cp);
|
|
|
|
/* Verify the signature on this CRL */
|
|
pubkey=X509_get_pubkey(xs);
|
|
if(X509_CRL_verify(crl, pubkey)<=0) {
|
|
rfbLog("Invalid signature on CRL\n");
|
|
X509_STORE_CTX_set_error(callback_ctx,
|
|
X509_V_ERR_CRL_SIGNATURE_FAILURE);
|
|
X509_OBJECT_free_contents(&obj);
|
|
if(pubkey)
|
|
EVP_PKEY_free(pubkey);
|
|
return 0; /* Reject connection */
|
|
}
|
|
if(pubkey)
|
|
EVP_PKEY_free(pubkey);
|
|
|
|
/* Check date of CRL to make sure it's not expired */
|
|
t=X509_CRL_get_nextUpdate(crl);
|
|
if(!t) {
|
|
rfbLog("Found CRL has invalid nextUpdate field\n");
|
|
X509_STORE_CTX_set_error(callback_ctx,
|
|
X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD);
|
|
X509_OBJECT_free_contents(&obj);
|
|
return 0; /* Reject connection */
|
|
}
|
|
if(X509_cmp_current_time(t)<0) {
|
|
rfbLog("Found CRL is expired - "
|
|
"revoking all certificates until you get updated CRL\n");
|
|
X509_STORE_CTX_set_error(callback_ctx, X509_V_ERR_CRL_HAS_EXPIRED);
|
|
X509_OBJECT_free_contents(&obj);
|
|
return 0; /* Reject connection */
|
|
}
|
|
X509_OBJECT_free_contents(&obj);
|
|
}
|
|
|
|
/* Try to retrieve a CRL corresponding to the _issuer_ of
|
|
* the current certificate in order to check for revocation. */
|
|
memset((char *)&obj, 0, sizeof(obj));
|
|
X509_STORE_CTX_init(&store_ctx, revocation_store, NULL, NULL);
|
|
rc=X509_STORE_get_by_subject(&store_ctx, X509_LU_CRL, issuer, &obj);
|
|
X509_STORE_CTX_cleanup(&store_ctx);
|
|
crl=obj.data.crl;
|
|
|
|
if(rc>0 && crl) {
|
|
/* Check if the current certificate is revoked by this CRL */
|
|
n=sk_X509_REVOKED_num(X509_CRL_get_REVOKED(crl));
|
|
for(i=0; i<n; i++) {
|
|
revoked=sk_X509_REVOKED_value(X509_CRL_get_REVOKED(crl), i);
|
|
if(ASN1_INTEGER_cmp(revoked->serialNumber,
|
|
X509_get_serialNumber(xs)) == 0) {
|
|
serial=ASN1_INTEGER_get(revoked->serialNumber);
|
|
cp=X509_NAME_oneline(issuer, NULL, 0);
|
|
rfbLog("Certificate with serial %ld (0x%lX) "
|
|
"revoked per CRL from issuer %s\n", serial, serial, cp);
|
|
OPENSSL_free(cp);
|
|
X509_STORE_CTX_set_error(callback_ctx, X509_V_ERR_CERT_REVOKED);
|
|
X509_OBJECT_free_contents(&obj);
|
|
return 0; /* Reject connection */
|
|
}
|
|
}
|
|
X509_OBJECT_free_contents(&obj);
|
|
}
|
|
|
|
return 1; /* Accept connection */
|
|
}
|
|
|
|
static int verify_callback(int ok, X509_STORE_CTX *callback_ctx) {
|
|
if (!ssl_verify) {
|
|
rfbLog("CRL_check: skipped.\n");
|
|
return ok;
|
|
}
|
|
if (!ssl_crl) {
|
|
rfbLog("CRL_check: skipped.\n");
|
|
return ok;
|
|
}
|
|
if (!ok) {
|
|
rfbLog("CRL_check: client cert is already rejected.\n");
|
|
return ok;
|
|
}
|
|
if (revocation_store) {
|
|
if (crl_callback(callback_ctx)) {
|
|
rfbLog("CRL_check: succeeded.\n");
|
|
return 1;
|
|
} else {
|
|
rfbLog("CRL_check: did not pass.\n");
|
|
return 0;
|
|
}
|
|
}
|
|
/* NOTREACHED */
|
|
return 1;
|
|
}
|
|
|
|
#define rfbSecTypeAnonTls 18
|
|
#define rfbSecTypeVencrypt 19
|
|
|
|
#define rfbVencryptPlain 256
|
|
#define rfbVencryptTlsNone 257
|
|
#define rfbVencryptTlsVnc 258
|
|
#define rfbVencryptTlsPlain 259
|
|
#define rfbVencryptX509None 260
|
|
#define rfbVencryptX509Vnc 261
|
|
#define rfbVencryptX509Plain 262
|
|
|
|
static int ssl_client_mode = 0;
|
|
|
|
static int switch_to_anon_dh(void);
|
|
|
|
void openssl_init(int isclient) {
|
|
int db = 0, tmp_pem = 0, do_dh;
|
|
FILE *in;
|
|
double ds;
|
|
long mode;
|
|
static int first = 1;
|
|
|
|
do_dh = DO_DH;
|
|
|
|
if (enc_str != NULL) {
|
|
if (first) {
|
|
init_prng();
|
|
}
|
|
first = 0;
|
|
return;
|
|
}
|
|
|
|
if (! quiet) {
|
|
rfbLog("\n");
|
|
rfbLog("Initializing SSL (%s connect mode).\n", isclient ? "client":"server");
|
|
}
|
|
if (first) {
|
|
if (db) fprintf(stderr, "\nSSL_load_error_strings()\n");
|
|
|
|
SSL_load_error_strings();
|
|
|
|
if (db) fprintf(stderr, "SSL_library_init()\n");
|
|
|
|
SSL_library_init();
|
|
|
|
if (db) fprintf(stderr, "init_prng()\n");
|
|
|
|
init_prng();
|
|
|
|
first = 0;
|
|
}
|
|
|
|
if (isclient) {
|
|
ssl_client_mode = 1;
|
|
} else {
|
|
ssl_client_mode = 0;
|
|
}
|
|
|
|
if (ssl_client_mode) {
|
|
if (db) fprintf(stderr, "SSLv23_client_method()\n");
|
|
ctx = SSL_CTX_new( SSLv23_client_method() );
|
|
} else {
|
|
if (db) fprintf(stderr, "SSLv23_server_method()\n");
|
|
ctx = SSL_CTX_new( SSLv23_server_method() );
|
|
}
|
|
|
|
if (ctx == NULL) {
|
|
rfbLog("openssl_init: SSL_CTX_new failed.\n");
|
|
sslerrexit();
|
|
}
|
|
|
|
ds = dnow();
|
|
rsa_512 = RSA_generate_key(512, RSA_F4, NULL, NULL);
|
|
if (rsa_512 == NULL) {
|
|
rfbLog("openssl_init: RSA_generate_key(512) failed.\n");
|
|
sslerrexit();
|
|
}
|
|
|
|
rfbLog("created 512 bit temporary RSA key: %.3fs\n", dnow() - ds);
|
|
|
|
ds = dnow();
|
|
rsa_1024 = RSA_generate_key(1024, RSA_F4, NULL, NULL);
|
|
if (rsa_1024 == NULL) {
|
|
rfbLog("openssl_init: RSA_generate_key(1024) failed.\n");
|
|
sslerrexit();
|
|
}
|
|
|
|
rfbLog("created 1024 bit temporary RSA key: %.3fs\n", dnow() - ds);
|
|
|
|
if (db) fprintf(stderr, "SSL_CTX_set_tmp_rsa()\n");
|
|
|
|
if (! SSL_CTX_set_tmp_rsa(ctx, rsa_1024)) {
|
|
rfbLog("openssl_init: SSL_CTX_set_tmp_rsa(1024) failed.\n");
|
|
sslerrexit();
|
|
}
|
|
|
|
mode = 0;
|
|
mode |= SSL_MODE_ENABLE_PARTIAL_WRITE;
|
|
mode |= SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER;
|
|
SSL_CTX_set_mode(ctx, mode);
|
|
|
|
#define ssl_cache 0
|
|
#if ssl_cache
|
|
SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_BOTH);
|
|
SSL_CTX_set_timeout(ctx, 300);
|
|
#else
|
|
SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
|
|
SSL_CTX_set_timeout(ctx, 1);
|
|
#endif
|
|
|
|
ds = dnow();
|
|
if (! openssl_pem) {
|
|
openssl_pem = create_tmp_pem(NULL, 0);
|
|
if (! openssl_pem) {
|
|
rfbLog("openssl_init: could not create temporary,"
|
|
" self-signed PEM.\n");
|
|
clean_up_exit(1);
|
|
}
|
|
tmp_pem = 1;
|
|
|
|
} else if (!strcmp(openssl_pem, "ANON")) {
|
|
if (ssl_verify) {
|
|
rfbLog("openssl_init: Anonymous Diffie-Hellman cannot"
|
|
" be used in -sslverify mode.\n");
|
|
clean_up_exit(1);
|
|
}
|
|
if (ssl_crl) {
|
|
rfbLog("openssl_init: Anonymous Diffie-Hellman cannot"
|
|
" be used in -sslCRL mode.\n");
|
|
clean_up_exit(1);
|
|
}
|
|
/* n.b. new ctx */
|
|
if (!switch_to_anon_dh()) {
|
|
rfbLog("openssl_init: Anonymous Diffie-Hellman setup"
|
|
" failed.\n");
|
|
clean_up_exit(1);
|
|
}
|
|
} else if (strstr(openssl_pem, "SAVE") == openssl_pem) {
|
|
openssl_pem = get_saved_pem(openssl_pem, 1);
|
|
if (! openssl_pem) {
|
|
rfbLog("openssl_init: could not create or open"
|
|
" saved PEM: %s\n", openssl_pem);
|
|
clean_up_exit(1);
|
|
}
|
|
tmp_pem = 0;
|
|
}
|
|
|
|
rfbLog("using PEM %s %.3fs\n", openssl_pem, dnow() - ds);
|
|
|
|
SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_callback);
|
|
|
|
if (do_dh) {
|
|
DH *dh;
|
|
BIO *bio;
|
|
|
|
ds = dnow();
|
|
in = fopen(openssl_pem, "r");
|
|
if (in == NULL) {
|
|
rfbLogPerror("fopen");
|
|
clean_up_exit(1);
|
|
}
|
|
bio = BIO_new_fp(in, BIO_CLOSE|BIO_FP_TEXT);
|
|
if (! bio) {
|
|
rfbLog("openssl_init: BIO_new_fp() failed.\n");
|
|
sslerrexit();
|
|
}
|
|
dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
|
|
if (dh == NULL) {
|
|
rfbLog("openssl_init: PEM_read_bio_DHparams() failed.\n");
|
|
BIO_free(bio);
|
|
sslerrexit();
|
|
}
|
|
BIO_free(bio);
|
|
SSL_CTX_set_tmp_dh(ctx, dh);
|
|
rfbLog("loaded Diffie Hellman %d bits, %.3fs\n",
|
|
8*DH_size(dh), dnow()-ds);
|
|
DH_free(dh);
|
|
}
|
|
|
|
if (strcmp(openssl_pem, "ANON")) {
|
|
if (! SSL_CTX_use_certificate_chain_file(ctx, openssl_pem)) {
|
|
rfbLog("openssl_init: SSL_CTX_use_certificate_chain_file() failed.\n");
|
|
sslerrexit();
|
|
}
|
|
if (! SSL_CTX_use_RSAPrivateKey_file(ctx, openssl_pem,
|
|
SSL_FILETYPE_PEM)) {
|
|
rfbLog("openssl_init: SSL_CTX_set_tmp_rsa(1024) failed.\n");
|
|
sslerrexit();
|
|
}
|
|
if (! SSL_CTX_check_private_key(ctx)) {
|
|
rfbLog("openssl_init: SSL_CTX_set_tmp_rsa(1024) failed.\n");
|
|
sslerrexit();
|
|
}
|
|
}
|
|
|
|
if (tmp_pem && ! getenv("X11VNC_KEEP_TMP_PEM")) {
|
|
if (getenv("X11VNC_SHOW_TMP_PEM")) {
|
|
FILE *in = fopen(openssl_pem, "r");
|
|
if (in != NULL) {
|
|
char line[128];
|
|
fprintf(stderr, "\n");
|
|
while (fgets(line, 128, in) != NULL) {
|
|
fprintf(stderr, "%s", line);
|
|
}
|
|
fprintf(stderr, "\n");
|
|
fclose(in);
|
|
}
|
|
}
|
|
unlink(openssl_pem);
|
|
free(openssl_pem);
|
|
openssl_pem = NULL;
|
|
}
|
|
|
|
if (ssl_crl) {
|
|
struct stat sbuf;
|
|
X509_LOOKUP *lookup;
|
|
|
|
if (stat(ssl_crl, &sbuf) != 0) {
|
|
rfbLog("openssl_init: -sslCRL does not exist %s.\n",
|
|
ssl_crl ? ssl_crl : "null");
|
|
rfbLogPerror("stat");
|
|
clean_up_exit(1);
|
|
}
|
|
|
|
revocation_store = X509_STORE_new();
|
|
if (!revocation_store) {
|
|
rfbLog("openssl_init: X509_STORE_new failed.\n");
|
|
sslerrexit();
|
|
}
|
|
if (! S_ISDIR(sbuf.st_mode)) {
|
|
lookup = X509_STORE_add_lookup(revocation_store, X509_LOOKUP_file());
|
|
if (!lookup) {
|
|
rfbLog("openssl_init: X509_STORE_add_lookup failed.\n");
|
|
sslerrexit();
|
|
}
|
|
if (!X509_LOOKUP_load_file(lookup, ssl_crl, X509_FILETYPE_PEM)) {
|
|
rfbLog("openssl_init: X509_LOOKUP_load_file failed.\n");
|
|
sslerrexit();
|
|
}
|
|
} else {
|
|
lookup = X509_STORE_add_lookup(revocation_store, X509_LOOKUP_hash_dir());
|
|
if (!lookup) {
|
|
rfbLog("openssl_init: X509_STORE_add_lookup failed.\n");
|
|
sslerrexit();
|
|
}
|
|
if (!X509_LOOKUP_add_dir(lookup, ssl_crl, X509_FILETYPE_PEM)) {
|
|
rfbLog("openssl_init: X509_LOOKUP_add_dir failed.\n");
|
|
sslerrexit();
|
|
}
|
|
}
|
|
rfbLog("loaded CRL file: %s\n", ssl_crl);
|
|
}
|
|
|
|
if (ssl_verify) {
|
|
struct stat sbuf;
|
|
char *file;
|
|
int lvl;
|
|
|
|
file = get_ssl_verify_file(ssl_verify);
|
|
|
|
if (!file || stat(file, &sbuf) != 0) {
|
|
rfbLog("openssl_init: -sslverify does not exist %s.\n",
|
|
file ? file : "null");
|
|
rfbLogPerror("stat");
|
|
clean_up_exit(1);
|
|
}
|
|
if (! S_ISDIR(sbuf.st_mode)) {
|
|
if (! SSL_CTX_load_verify_locations(ctx, file, NULL)) {
|
|
rfbLog("openssl_init: SSL_CTX_load_verify_"
|
|
"locations() failed.\n");
|
|
sslerrexit();
|
|
}
|
|
} else {
|
|
if (! SSL_CTX_load_verify_locations(ctx, NULL, file)) {
|
|
rfbLog("openssl_init: SSL_CTX_load_verify_"
|
|
"locations() failed.\n");
|
|
sslerrexit();
|
|
}
|
|
}
|
|
|
|
lvl = SSL_VERIFY_FAIL_IF_NO_PEER_CERT|SSL_VERIFY_PEER;
|
|
if (ssl_crl == NULL) {
|
|
SSL_CTX_set_verify(ctx, lvl, NULL);
|
|
} else {
|
|
SSL_CTX_set_verify(ctx, lvl, verify_callback);
|
|
}
|
|
if (strstr(file, "/sslverify-tmp-load-")) {
|
|
/* temporary file */
|
|
unlink(file);
|
|
}
|
|
} else {
|
|
SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL);
|
|
}
|
|
|
|
rfbLog("\n");
|
|
}
|
|
|
|
static int read_exact(int sock, char *buf, int len) {
|
|
int n, fail = 0;
|
|
if (sock < 0) {
|
|
return 0;
|
|
}
|
|
while (len > 0) {
|
|
n = read(sock, buf, len);
|
|
if (n > 0) {
|
|
buf += n;
|
|
len -= n;
|
|
} else if (n == 0) {
|
|
fail = 1;
|
|
break;
|
|
} else if (n < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
|
|
usleep(10*1000);
|
|
} else if (n < 0 && errno != EINTR) {
|
|
fail = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (fail) {
|
|
return 0;
|
|
} else {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
static int write_exact(int sock, char *buf, int len) {
|
|
int n, fail = 0;
|
|
if (sock < 0) {
|
|
return 0;
|
|
}
|
|
while (len > 0) {
|
|
n = write(sock, buf, len);
|
|
if (n > 0) {
|
|
buf += n;
|
|
len -= n;
|
|
} else if (n == 0) {
|
|
fail = 1;
|
|
break;
|
|
} else if (n < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
|
|
usleep(10*1000);
|
|
} else if (n < 0 && errno != EINTR) {
|
|
fail = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (fail) {
|
|
return 0;
|
|
} else {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/* XXX not in rfb.h: */
|
|
void rfbClientSendString(rfbClientPtr cl, char *reason);
|
|
|
|
static int finish_auth(rfbClientPtr client, char *type) {
|
|
int security_result, ret;
|
|
|
|
ret = 0;
|
|
|
|
if (getenv("X11VNC_DEBUG_TLSPLAIN")) fprintf(stderr, "finish_auth type=%s\n", type);
|
|
|
|
if (!strcmp(type, "None")) {
|
|
security_result = 0; /* success */
|
|
if (write_exact(client->sock, (char *) &security_result, 4)) {
|
|
ret = 1;
|
|
}
|
|
rfbLog("finish_auth: using auth 'None'\n");
|
|
client->state = RFB_INITIALISATION;
|
|
|
|
} else if (!strcmp(type, "Vnc")) {
|
|
RAND_bytes(client->authChallenge, CHALLENGESIZE);
|
|
if (write_exact(client->sock, (char *) &client->authChallenge, CHALLENGESIZE)) {
|
|
ret = 1;
|
|
}
|
|
rfbLog("finish_auth: using auth 'Vnc', sent challenge.\n");
|
|
client->state = RFB_AUTHENTICATION;
|
|
|
|
} else if (!strcmp(type, "Plain")) {
|
|
if (!unixpw) {
|
|
rfbLog("finish_auth: *Plain not allowed outside unixpw mode.\n");
|
|
ret = 0;
|
|
} else {
|
|
char *un, *pw;
|
|
int unlen, pwlen;
|
|
|
|
if (getenv("X11VNC_DEBUG_TLSPLAIN")) fprintf(stderr, "*Plain begin: onHold=%d client=%p unixpw_client=%p\n", client->onHold, (void *) client, (void *) unixpw_client);
|
|
|
|
if (!read_exact(client->sock, (char *)&unlen, 4)) goto fail;
|
|
unlen = Swap32IfLE(unlen);
|
|
|
|
if (getenv("X11VNC_DEBUG_TLSPLAIN")) fprintf(stderr, "unlen: %d\n", unlen);
|
|
|
|
if (!read_exact(client->sock, (char *)&pwlen, 4)) goto fail;
|
|
pwlen = Swap32IfLE(pwlen);
|
|
|
|
if (getenv("X11VNC_DEBUG_TLSPLAIN")) fprintf(stderr, "pwlen: %d\n", pwlen);
|
|
|
|
un = (char *) malloc(unlen+1);
|
|
memset(un, 0, unlen+1);
|
|
|
|
pw = (char *) malloc(pwlen+2);
|
|
memset(pw, 0, pwlen+2);
|
|
|
|
if (!read_exact(client->sock, un, unlen)) goto fail;
|
|
if (!read_exact(client->sock, pw, pwlen)) goto fail;
|
|
|
|
if (getenv("X11VNC_DEBUG_TLSPLAIN")) fprintf(stderr, "*Plain: %d %d '%s' ... \n", unlen, pwlen, un);
|
|
strcat(pw, "\n");
|
|
|
|
if (unixpw_verify(un, pw)) {
|
|
security_result = 0; /* success */
|
|
if (write_exact(client->sock, (char *) &security_result, 4)) {
|
|
ret = 1;
|
|
unixpw_verify_screen(un, pw);
|
|
}
|
|
client->onHold = FALSE;
|
|
client->state = RFB_INITIALISATION;
|
|
}
|
|
if (ret == 0) {
|
|
rfbClientSendString(client, "unixpw failed");
|
|
}
|
|
|
|
memset(un, 0, unlen+1);
|
|
memset(pw, 0, pwlen+2);
|
|
free(un);
|
|
free(pw);
|
|
}
|
|
} else {
|
|
rfbLog("finish_auth: unknown sub-type: %s\n", type);
|
|
ret = 0;
|
|
}
|
|
|
|
fail:
|
|
return ret;
|
|
}
|
|
|
|
static int finish_vencrypt_auth(rfbClientPtr client, int subtype) {
|
|
|
|
if (subtype == rfbVencryptTlsNone || subtype == rfbVencryptX509None) {
|
|
return finish_auth(client, "None");
|
|
} else if (subtype == rfbVencryptTlsVnc || subtype == rfbVencryptX509Vnc) {
|
|
return finish_auth(client, "Vnc");
|
|
} else if (subtype == rfbVencryptTlsPlain || subtype == rfbVencryptX509Plain) {
|
|
return finish_auth(client, "Plain");
|
|
} else {
|
|
rfbLog("finish_vencrypt_auth: unknown sub-type: %d\n", subtype);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
|
|
static int add_anon_dh(void) {
|
|
pid_t pid, pidw;
|
|
char cnf[] = "/tmp/x11vnc-dh.XXXXXX";
|
|
char *infile = NULL;
|
|
int status, cnf_fd;
|
|
DH *dh;
|
|
BIO *bio;
|
|
FILE *in;
|
|
double ds;
|
|
/*
|
|
* These are dh parameters (prime, generator), not dh keys.
|
|
* Evidently it is ok for them to be publicly known.
|
|
* openssl dhparam -out dh.out 1024
|
|
*/
|
|
char *fixed_dh_params =
|
|
"-----BEGIN DH PARAMETERS-----\n"
|
|
"MIGHAoGBAL28w69ZnLYBvp8R2OeqtAIms+oatY19iBL4WhGI/7H1OMmkJjIe+OHs\n"
|
|
"PXoJfe5ucrnvno7Xm+HJZYa1jnPGQuWoa/VJKXdVjYdJVNzazJKM2daKKcQA4GDc\n"
|
|
"msFS5DxLbzUR5jy1n12K3EcbvpyFqDYVTJJXm7NuNuiWRfz3wTozAgEC\n"
|
|
"-----END DH PARAMETERS-----\n";
|
|
|
|
if (dhparams_file != NULL) {
|
|
infile = dhparams_file;
|
|
rfbLog("add_anon_dh: using %s\n", dhparams_file);
|
|
goto readin;
|
|
}
|
|
|
|
cnf_fd = mkstemp(cnf);
|
|
if (cnf_fd < 0) {
|
|
return 0;
|
|
}
|
|
infile = cnf;
|
|
|
|
if (create_fresh_dhparams) {
|
|
|
|
if (new_dh_params != NULL) {
|
|
write(cnf_fd, new_dh_params, strlen(new_dh_params));
|
|
close(cnf_fd);
|
|
} else {
|
|
char *exe = find_openssl_bin();
|
|
struct stat sbuf;
|
|
|
|
if (no_external_cmds || !cmd_ok("ssl")) {
|
|
rfbLog("add_anon_dh: cannot run external commands.\n");
|
|
return 0;
|
|
}
|
|
|
|
close(cnf_fd);
|
|
if (exe == NULL) {
|
|
return 0;
|
|
}
|
|
ds = dnow();
|
|
pid = fork();
|
|
if (pid < 0) {
|
|
return 0;
|
|
} else if (pid == 0) {
|
|
int i;
|
|
for (i=0; i<256; i++) {
|
|
if (i == 2) continue;
|
|
close(i);
|
|
}
|
|
/* rather slow at 1024 */
|
|
execlp(exe, exe, "dhparam", "-out", cnf, "1024", (char *)0);
|
|
exit(1);
|
|
}
|
|
pidw = waitpid(pid, &status, 0);
|
|
if (pidw != pid) {
|
|
return 0;
|
|
}
|
|
if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
|
|
;
|
|
} else {
|
|
return 0;
|
|
}
|
|
rfbLog("add_anon_dh: created new DH params in %.3f secs\n", dnow() - ds);
|
|
|
|
if (stat(cnf, &sbuf) == 0 && sbuf.st_size > 0) {
|
|
/* save it to reuse during our process's lifetime: */
|
|
int d = open(cnf, O_RDONLY);
|
|
if (d >= 0) {
|
|
int n, len = sbuf.st_size;
|
|
new_dh_params = (char *) calloc(len+1, 1);
|
|
n = read(d, new_dh_params, len);
|
|
close(d);
|
|
if (n != len) {
|
|
free(new_dh_params);
|
|
new_dh_params = NULL;
|
|
} else if (dhret != NULL) {
|
|
d = open(dhret, O_WRONLY);
|
|
if (d >= 0) {
|
|
write(d, new_dh_params, strlen(new_dh_params));
|
|
close(d);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
write(cnf_fd, fixed_dh_params, strlen(fixed_dh_params));
|
|
close(cnf_fd);
|
|
}
|
|
|
|
readin:
|
|
|
|
ds = dnow();
|
|
in = fopen(infile, "r");
|
|
|
|
if (in == NULL) {
|
|
rfbLogPerror("fopen");
|
|
unlink(cnf);
|
|
return 0;
|
|
}
|
|
bio = BIO_new_fp(in, BIO_CLOSE|BIO_FP_TEXT);
|
|
if (! bio) {
|
|
rfbLog("openssl_init: BIO_new_fp() failed.\n");
|
|
unlink(cnf);
|
|
return 0;
|
|
}
|
|
dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
|
|
if (dh == NULL) {
|
|
rfbLog("openssl_init: PEM_read_bio_DHparams() failed.\n");
|
|
unlink(cnf);
|
|
BIO_free(bio);
|
|
return 0;
|
|
}
|
|
BIO_free(bio);
|
|
SSL_CTX_set_tmp_dh(ctx, dh);
|
|
rfbLog("loaded Diffie Hellman %d bits, %.3fs\n", 8*DH_size(dh), dnow()-ds);
|
|
DH_free(dh);
|
|
|
|
unlink(cnf);
|
|
return 1;
|
|
}
|
|
|
|
static int switch_to_anon_dh(void) {
|
|
long mode;
|
|
|
|
rfbLog("Using Anonymous Diffie-Hellman mode.\n");
|
|
rfbLog("WARNING: Anonymous Diffie-Hellman uses encryption but is\n");
|
|
rfbLog("WARNING: susceptible to a Man-In-The-Middle attack.\n");
|
|
if (ssl_client_mode) {
|
|
ctx = SSL_CTX_new( SSLv23_client_method() );
|
|
} else {
|
|
ctx = SSL_CTX_new( SSLv23_server_method() );
|
|
}
|
|
if (ctx == NULL) {
|
|
return 0;
|
|
}
|
|
if (ssl_client_mode) {
|
|
return 1;
|
|
}
|
|
if (!SSL_CTX_set_cipher_list(ctx, "ADH:@STRENGTH")) {
|
|
return 0;
|
|
}
|
|
if (!add_anon_dh()) {
|
|
return 0;
|
|
}
|
|
|
|
mode = 0;
|
|
mode |= SSL_MODE_ENABLE_PARTIAL_WRITE;
|
|
mode |= SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER;
|
|
SSL_CTX_set_mode(ctx, mode);
|
|
|
|
SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_BOTH);
|
|
SSL_CTX_set_timeout(ctx, 300);
|
|
SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_callback);
|
|
SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int anontls_dialog(int s_in, int s_out) {
|
|
|
|
if (s_in || s_out) {}
|
|
anontls_selected = 1;
|
|
|
|
if (!switch_to_anon_dh()) {
|
|
rfbLog("anontls: Anonymous Diffie-Hellman failed.\n");
|
|
return 0;
|
|
}
|
|
|
|
/* continue with SSL/TLS */
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Using spec:
|
|
* http://www.mail-archive.com/qemu-devel@nongnu.org/msg08681.html
|
|
*/
|
|
static int vencrypt_dialog(int s_in, int s_out) {
|
|
char buf[256], buf2[256];
|
|
int subtypes[16];
|
|
int n, i, ival, ok, nsubtypes = 0;
|
|
|
|
vencrypt_selected = 0;
|
|
|
|
/* send version 0.2 */
|
|
buf[0] = 0;
|
|
buf[1] = 2;
|
|
|
|
if (!write_exact(s_out, buf, 2)) {
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
|
|
/* read client version 0.2 */
|
|
memset(buf, 0, sizeof(buf));
|
|
if (!read_exact(s_in, buf, 2)) {
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
rfbLog("vencrypt: received %d.%d client version.\n", (int) buf[0], (int) buf[1]);
|
|
|
|
/* close 0.0 */
|
|
if (buf[0] == 0 && buf[1] == 0) {
|
|
rfbLog("vencrypt: received 0.0 version, closing connection.\n");
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
|
|
/* accept only 0.2 */
|
|
if (buf[0] != 0 || buf[1] != 2) {
|
|
rfbLog("vencrypt: unsupported VeNCrypt version, closing connection.\n");
|
|
buf[0] = (char) 255;
|
|
write_exact(s_out, buf, 1);
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
|
|
/* tell them OK */
|
|
buf[0] = 0;
|
|
if (!write_exact(s_out, buf, 1)) {
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
|
|
if (getenv("X11VNC_ENABLE_VENCRYPT_PLAIN_LOGIN")) {
|
|
vencrypt_enable_plain_login = atoi(getenv("X11VNC_ENABLE_VENCRYPT_PLAIN_LOGIN"));
|
|
}
|
|
|
|
/* load our list of sub-types: */
|
|
n = 0;
|
|
if (!ssl_verify && vencrypt_kx != VENCRYPT_NODH) {
|
|
if (screen->authPasswdData != NULL) {
|
|
subtypes[n++] = rfbVencryptTlsVnc;
|
|
} else {
|
|
if (vencrypt_enable_plain_login && unixpw) {
|
|
subtypes[n++] = rfbVencryptTlsPlain;
|
|
} else {
|
|
subtypes[n++] = rfbVencryptTlsNone;
|
|
}
|
|
}
|
|
}
|
|
if (vencrypt_kx != VENCRYPT_NOX509) {
|
|
if (screen->authPasswdData != NULL) {
|
|
subtypes[n++] = rfbVencryptX509Vnc;
|
|
} else {
|
|
if (vencrypt_enable_plain_login && unixpw) {
|
|
subtypes[n++] = rfbVencryptX509Plain;
|
|
} else {
|
|
subtypes[n++] = rfbVencryptX509None;
|
|
}
|
|
}
|
|
}
|
|
|
|
nsubtypes = n;
|
|
for (i = 0; i < nsubtypes; i++) {
|
|
((uint32_t *)buf)[i] = Swap32IfLE(subtypes[i]);
|
|
}
|
|
|
|
/* send number first: */
|
|
buf2[0] = (char) nsubtypes;
|
|
if (!write_exact(s_out, buf2, 1)) {
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
/* and now the list: */
|
|
if (!write_exact(s_out, buf, 4*n)) {
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
|
|
/* read client's selection: */
|
|
if (!read_exact(s_in, (char *)&ival, 4)) {
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
ival = Swap32IfLE(ival);
|
|
|
|
/* zero means no dice: */
|
|
if (ival == 0) {
|
|
rfbLog("vencrypt: client selected no sub-type, closing connection.\n");
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
|
|
/* check if he selected a valid one: */
|
|
ok = 0;
|
|
for (i = 0; i < nsubtypes; i++) {
|
|
if (ival == subtypes[i]) {
|
|
ok = 1;
|
|
}
|
|
}
|
|
|
|
if (!ok) {
|
|
rfbLog("vencrypt: client selected invalid sub-type: %d\n", ival);
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
} else {
|
|
char *st = "unknown!!";
|
|
if (ival == rfbVencryptTlsNone) st = "rfbVencryptTlsNone";
|
|
if (ival == rfbVencryptTlsVnc) st = "rfbVencryptTlsVnc";
|
|
if (ival == rfbVencryptTlsPlain) st = "rfbVencryptTlsPlain";
|
|
if (ival == rfbVencryptX509None) st = "rfbVencryptX509None";
|
|
if (ival == rfbVencryptX509Vnc) st = "rfbVencryptX509Vnc";
|
|
if (ival == rfbVencryptX509Plain) st = "rfbVencryptX509Plain";
|
|
rfbLog("vencrypt: client selected sub-type: %d (%s)\n", ival, st);
|
|
}
|
|
|
|
vencrypt_selected = ival;
|
|
|
|
/* not documented in spec, send OK: */
|
|
buf[0] = 1;
|
|
if (!write_exact(s_out, buf, 1)) {
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
|
|
if (vencrypt_selected == rfbVencryptTlsNone ||
|
|
vencrypt_selected == rfbVencryptTlsVnc ||
|
|
vencrypt_selected == rfbVencryptTlsPlain) {
|
|
/* these modes are Anonymous Diffie-Hellman */
|
|
if (!switch_to_anon_dh()) {
|
|
rfbLog("vencrypt: Anonymous Diffie-Hellman failed.\n");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* continue with SSL/TLS */
|
|
return 1;
|
|
}
|
|
|
|
static int check_vnc_tls_mode(int s_in, int s_out, double last_https) {
|
|
double waited = 0.0, waitmax = 1.4, dt = 0.01, start = dnow();
|
|
struct timeval tv;
|
|
int input = 0, i, n, ok;
|
|
int major, minor, sectype = -1;
|
|
char *proto = "RFB 003.008\n";
|
|
char *stype = "unknown";
|
|
char buf[256];
|
|
|
|
vencrypt_selected = 0;
|
|
anontls_selected = 0;
|
|
|
|
if (vencrypt_mode == VENCRYPT_NONE && anontls_mode == ANONTLS_NONE) {
|
|
/* only normal SSL */
|
|
return 1;
|
|
}
|
|
if (ssl_client_mode) {
|
|
if (vencrypt_mode == VENCRYPT_FORCE || anontls_mode == ANONTLS_FORCE) {
|
|
rfbLog("check_vnc_tls_mode: VENCRYPT_FORCE/ANONTLS_FORCE in client\n");
|
|
rfbLog("check_vnc_tls_mode: connect mode.\n");
|
|
/* this is OK, continue on below for dialog. */
|
|
} else {
|
|
/* otherwise we must assume normal SSL (we send client hello) */
|
|
return 1;
|
|
}
|
|
}
|
|
if (ssl_verify && vencrypt_mode != VENCRYPT_FORCE && anontls_mode == ANONTLS_FORCE) {
|
|
rfbLog("check_vnc_tls_mode: Cannot use ANONTLS_FORCE with -sslverify (Anon DH only)\n");
|
|
/* fallback to normal SSL */
|
|
return 1;
|
|
}
|
|
|
|
if (last_https > 0.0) {
|
|
double now = dnow();
|
|
if (now < last_https + 5.0) {
|
|
waitmax = 20.0;
|
|
} else if (now < last_https + 15.0) {
|
|
waitmax = 10.0;
|
|
} else if (now < last_https + 30.0) {
|
|
waitmax = 5.0;
|
|
} else if (now < last_https + 60.0) {
|
|
waitmax = 2.5;
|
|
}
|
|
}
|
|
|
|
while (waited < waitmax) {
|
|
fd_set rfds;
|
|
FD_ZERO(&rfds);
|
|
FD_SET(s_in, &rfds);
|
|
tv.tv_sec = 0;
|
|
tv.tv_usec = 0;
|
|
select(s_in+1, &rfds, NULL, NULL, &tv);
|
|
if (FD_ISSET(s_in, &rfds)) {
|
|
input = 1;
|
|
break;
|
|
}
|
|
usleep((int) (1000 * 1000 * dt));
|
|
waited += dt;
|
|
}
|
|
rfbLog("check_vnc_tls_mode: waited: %f / %.2f input: %s\n",
|
|
dnow() - start, waitmax, input ? "SSL Handshake" : "(future) RFB Handshake");
|
|
|
|
if (input) {
|
|
/* got SSL client hello, can only assume normal SSL */
|
|
if (vencrypt_mode == VENCRYPT_FORCE || anontls_mode == ANONTLS_FORCE) {
|
|
rfbLog("check_vnc_tls_mode: VENCRYPT_FORCE/ANONTLS_FORCE prevents normal SSL\n");
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/* send RFB 003.008 -- there is no turning back from this point... */
|
|
if (!write_exact(s_out, proto, strlen(proto))) {
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
|
|
memset(buf, 0, sizeof(buf));
|
|
if (!read_exact(s_in, buf, 12)) {
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
|
|
if (sscanf(buf, "RFB %03d.%03d\n", &major, &minor) != 2) {
|
|
int i;
|
|
rfbLog("check_vnc_tls_mode: abnormal handshake: '%s'\nbytes: ", buf);
|
|
for (i=0; i < 12; i++) {
|
|
fprintf(stderr, "%d.", (unsigned char) buf[i]);
|
|
}
|
|
fprintf(stderr, "\n");
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
rfbLog("check_vnc_tls_mode: version: %d.%d\n", major, minor);
|
|
if (major != 3 || minor < 8) {
|
|
rfbLog("check_vnc_tls_mode: invalid version: '%s'\n", buf);
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
|
|
n = 1;
|
|
if (vencrypt_mode == VENCRYPT_FORCE) {
|
|
buf[n++] = rfbSecTypeVencrypt;
|
|
} else if (anontls_mode == ANONTLS_FORCE && !ssl_verify) {
|
|
buf[n++] = rfbSecTypeAnonTls;
|
|
} else if (vencrypt_mode == VENCRYPT_SOLE) {
|
|
buf[n++] = rfbSecTypeVencrypt;
|
|
} else if (anontls_mode == ANONTLS_SOLE && !ssl_verify) {
|
|
buf[n++] = rfbSecTypeAnonTls;
|
|
} else {
|
|
if (vencrypt_mode == VENCRYPT_SUPPORT) {
|
|
buf[n++] = rfbSecTypeVencrypt;
|
|
}
|
|
if (anontls_mode == ANONTLS_SUPPORT && !ssl_verify) {
|
|
buf[n++] = rfbSecTypeAnonTls;
|
|
}
|
|
}
|
|
|
|
n--;
|
|
buf[0] = (char) n;
|
|
if (!write_exact(s_out, buf, n+1)) {
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
if (0) fprintf(stderr, "wrote[%d] %d %d %d\n", n, buf[0], buf[1], buf[2]);
|
|
|
|
buf[0] = 0;
|
|
if (!read_exact(s_in, buf, 1)) {
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
|
|
if (buf[0] == rfbSecTypeVencrypt) stype = "VeNCrypt";
|
|
if (buf[0] == rfbSecTypeAnonTls) stype = "ANONTLS";
|
|
|
|
rfbLog("check_vnc_tls_mode: reply: %d (%s)\n", (int) buf[0], stype);
|
|
|
|
ok = 0;
|
|
for (i=1; i < n+1; i++) {
|
|
if (buf[0] == buf[i]) {
|
|
ok = 1;
|
|
}
|
|
}
|
|
if (!ok) {
|
|
char *msg = "check_vnc_tls_mode: invalid security-type";
|
|
int len = strlen(msg);
|
|
rfbLog("%s: %d\n", msg, (int) buf[0]);
|
|
((uint32_t *)buf)[0] = Swap32IfLE(len);
|
|
write_exact(s_out, buf, 4);
|
|
write_exact(s_out, msg, strlen(msg));
|
|
close(s_in); close(s_out);
|
|
return 0;
|
|
}
|
|
|
|
sectype = (int) buf[0];
|
|
|
|
if (sectype == rfbSecTypeVencrypt) {
|
|
return vencrypt_dialog(s_in, s_out);
|
|
} else if (sectype == rfbSecTypeAnonTls) {
|
|
return anontls_dialog(s_in, s_out);
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static void pr_ssl_info(int verb) {
|
|
SSL_CIPHER *c;
|
|
SSL_SESSION *s;
|
|
char *proto = "unknown";
|
|
|
|
if (verb) {}
|
|
|
|
if (ssl == NULL) {
|
|
return;
|
|
}
|
|
c = SSL_get_current_cipher(ssl);
|
|
s = SSL_get_session(ssl);
|
|
|
|
if (s == NULL) {
|
|
proto = "nosession";
|
|
} else if (s->ssl_version == SSL2_VERSION) {
|
|
proto = "SSLv2";
|
|
} else if (s->ssl_version == SSL3_VERSION) {
|
|
proto = "SSLv3";
|
|
} else if (s->ssl_version == TLS1_VERSION) {
|
|
proto = "TLSv1";
|
|
}
|
|
if (c != NULL) {
|
|
rfbLog("SSL: ssl_helper[%d]: Cipher: %s %s Proto: %s\n", getpid(),
|
|
SSL_CIPHER_get_version(c), SSL_CIPHER_get_name(c), proto);
|
|
} else {
|
|
rfbLog("SSL: ssl_helper[%d]: Proto: %s\n", getpid(),
|
|
proto);
|
|
}
|
|
}
|
|
|
|
static void ssl_timeout (int sig) {
|
|
int i;
|
|
rfbLog("sig: %d, ssl_init[%d] timed out.\n", sig, getpid());
|
|
rfbLog("To increase the SSL initialization timeout use, e.g.:\n");
|
|
rfbLog(" -env SSL_INIT_TIMEOUT=120 (for 120 seconds)\n");
|
|
for (i=0; i < 256; i++) {
|
|
close(i);
|
|
}
|
|
exit(1);
|
|
}
|
|
|
|
static int ssl_init(int s_in, int s_out, int skip_vnc_tls, double last_https) {
|
|
unsigned char *sid = (unsigned char *) "x11vnc SID";
|
|
char *name = NULL;
|
|
int peerport = 0;
|
|
int db = 0, rc, err;
|
|
int ssock = s_in;
|
|
double start = dnow();
|
|
int timeout = 20;
|
|
|
|
if (enc_str != NULL) {
|
|
return 1;
|
|
}
|
|
if (getenv("SSL_DEBUG")) {
|
|
db = atoi(getenv("SSL_DEBUG"));
|
|
}
|
|
usleep(100 * 1000);
|
|
if (getenv("SSL_INIT_TIMEOUT")) {
|
|
timeout = atoi(getenv("SSL_INIT_TIMEOUT"));
|
|
} else if (client_connect != NULL && strstr(client_connect, "repeater")) {
|
|
rfbLog("SSL: ssl_init[%d]: detected 'repeater' in connect string.\n", getpid());
|
|
rfbLog("SSL: setting timeout to 1 hour: -env SSL_INIT_TIMEOUT=3600\n");
|
|
rfbLog("SSL: use that option to set a different timeout value,\n");
|
|
rfbLog("SSL: however note that with Windows UltraVNC repeater it\n");
|
|
rfbLog("SSL: may timeout before your setting due to other reasons.\n");
|
|
timeout = 3600;
|
|
}
|
|
|
|
if (skip_vnc_tls) {
|
|
rfbLog("SSL: ssl_helper[%d]: HTTPS mode, skipping check_vnc_tls_mode()\n",
|
|
getpid());
|
|
} else if (!check_vnc_tls_mode(s_in, s_out, last_https)) {
|
|
return 0;
|
|
}
|
|
rfbLog("SSL: ssl_init[%d]: %d/%d initialization timeout: %d secs.\n",
|
|
getpid(), s_in, s_out, timeout);
|
|
|
|
ssl = SSL_new(ctx);
|
|
if (ssl == NULL) {
|
|
fprintf(stderr, "SSL_new failed\n");
|
|
return 0;
|
|
}
|
|
if (db > 1) fprintf(stderr, "ssl_init: 1\n");
|
|
|
|
SSL_set_session_id_context(ssl, sid, strlen((char *)sid));
|
|
|
|
if (s_in == s_out) {
|
|
if (! SSL_set_fd(ssl, ssock)) {
|
|
fprintf(stderr, "SSL_set_fd failed\n");
|
|
return 0;
|
|
}
|
|
} else {
|
|
if (! SSL_set_rfd(ssl, s_in)) {
|
|
fprintf(stderr, "SSL_set_rfd failed\n");
|
|
return 0;
|
|
}
|
|
if (! SSL_set_wfd(ssl, s_out)) {
|
|
fprintf(stderr, "SSL_set_wfd failed\n");
|
|
return 0;
|
|
}
|
|
}
|
|
if (db > 1) fprintf(stderr, "ssl_init: 2\n");
|
|
|
|
if (ssl_client_mode) {
|
|
SSL_set_connect_state(ssl);
|
|
} else {
|
|
SSL_set_accept_state(ssl);
|
|
}
|
|
|
|
if (db > 1) fprintf(stderr, "ssl_init: 3\n");
|
|
|
|
name = get_remote_host(ssock);
|
|
peerport = get_remote_port(ssock);
|
|
|
|
if (!strcmp(name, "0.0.0.0") && openssl_last_ip != NULL) {
|
|
name = strdup(openssl_last_ip);
|
|
}
|
|
|
|
if (db > 1) fprintf(stderr, "ssl_init: 4\n");
|
|
|
|
while (1) {
|
|
|
|
signal(SIGALRM, ssl_timeout);
|
|
alarm(timeout);
|
|
|
|
if (ssl_client_mode) {
|
|
if (db) fprintf(stderr, "calling SSL_connect...\n");
|
|
rc = SSL_connect(ssl);
|
|
} else {
|
|
if (db) fprintf(stderr, "calling SSL_accept...\n");
|
|
rc = SSL_accept(ssl);
|
|
}
|
|
err = SSL_get_error(ssl, rc);
|
|
|
|
alarm(0);
|
|
signal(SIGALRM, SIG_DFL);
|
|
|
|
if (ssl_client_mode) {
|
|
if (db) fprintf(stderr, "SSL_connect %d/%d\n", rc, err);
|
|
} else {
|
|
if (db) fprintf(stderr, "SSL_accept %d/%d\n", rc, err);
|
|
}
|
|
if (err == SSL_ERROR_NONE) {
|
|
break;
|
|
} else if (err == SSL_ERROR_WANT_READ) {
|
|
|
|
if (db) fprintf(stderr, "got SSL_ERROR_WANT_READ\n");
|
|
rfbLog("SSL: ssl_helper[%d]: %s() failed for: %s:%d 1\n",
|
|
getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept", name, peerport);
|
|
pr_ssl_info(1);
|
|
return 0;
|
|
|
|
} else if (err == SSL_ERROR_WANT_WRITE) {
|
|
|
|
if (db) fprintf(stderr, "got SSL_ERROR_WANT_WRITE\n");
|
|
rfbLog("SSL: ssl_helper[%d]: %s() failed for: %s:%d 2\n",
|
|
getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept", name, peerport);
|
|
pr_ssl_info(1);
|
|
return 0;
|
|
|
|
} else if (err == SSL_ERROR_SYSCALL) {
|
|
|
|
if (db) fprintf(stderr, "got SSL_ERROR_SYSCALL\n");
|
|
rfbLog("SSL: ssl_helper[%d]: %s() failed for: %s:%d 3\n",
|
|
getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept", name, peerport);
|
|
pr_ssl_info(1);
|
|
return 0;
|
|
|
|
} else if (err == SSL_ERROR_ZERO_RETURN) {
|
|
|
|
if (db) fprintf(stderr, "got SSL_ERROR_ZERO_RETURN\n");
|
|
rfbLog("SSL: ssl_helper[%d]: %s() failed for: %s:%d 4\n",
|
|
getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept", name, peerport);
|
|
pr_ssl_info(1);
|
|
return 0;
|
|
|
|
} else if (rc < 0) {
|
|
unsigned long err;
|
|
int cnt = 0;
|
|
|
|
rfbLog("SSL: ssl_helper[%d]: %s() *FATAL: %d SSL FAILED\n",
|
|
getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept", rc);
|
|
while ((err = ERR_get_error()) != 0) {
|
|
rfbLog("SSL: %s\n", ERR_error_string(err, NULL));
|
|
if (cnt++ > 100) {
|
|
break;
|
|
}
|
|
}
|
|
pr_ssl_info(1);
|
|
return 0;
|
|
|
|
} else if (dnow() > start + 3.0) {
|
|
|
|
rfbLog("SSL: ssl_helper[%d]: timeout looping %s() "
|
|
"fatal.\n", getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept");
|
|
pr_ssl_info(1);
|
|
return 0;
|
|
|
|
} else {
|
|
BIO *bio = SSL_get_rbio(ssl);
|
|
if (bio == NULL) {
|
|
rfbLog("SSL: ssl_helper[%d]: ssl BIO is null. "
|
|
"fatal.\n", getpid());
|
|
pr_ssl_info(1);
|
|
return 0;
|
|
}
|
|
if (BIO_eof(bio)) {
|
|
rfbLog("SSL: ssl_helper[%d]: ssl BIO is EOF. "
|
|
"fatal.\n", getpid());
|
|
pr_ssl_info(1);
|
|
return 0;
|
|
}
|
|
}
|
|
usleep(10 * 1000);
|
|
}
|
|
|
|
if (ssl_client_mode) {
|
|
rfbLog("SSL: ssl_helper[%d]: SSL_connect() succeeded for: %s:%d\n", getpid(), name, peerport);
|
|
} else {
|
|
rfbLog("SSL: ssl_helper[%d]: SSL_accept() succeeded for: %s:%d\n", getpid(), name, peerport);
|
|
}
|
|
|
|
pr_ssl_info(0);
|
|
|
|
if (SSL_get_verify_result(ssl) == X509_V_OK) {
|
|
X509 *x;
|
|
FILE *cr = NULL;
|
|
if (certret != NULL) {
|
|
cr = fopen(certret, "w");
|
|
}
|
|
|
|
x = SSL_get_peer_certificate(ssl);
|
|
if (x == NULL) {
|
|
rfbLog("SSL: ssl_helper[%d]: accepted client %s x509 peer cert is null\n", getpid(), name);
|
|
if (cr != NULL) {
|
|
fprintf(cr, "NOCERT\n");
|
|
fclose(cr);
|
|
}
|
|
} else {
|
|
rfbLog("SSL: ssl_helper[%d]: accepted client %s x509 cert is:\n", getpid(), name);
|
|
#if LIBVNCSERVER_HAVE_X509_PRINT_EX_FP
|
|
X509_print_ex_fp(stderr, x, 0, XN_FLAG_MULTILINE);
|
|
#endif
|
|
if (cr != NULL) {
|
|
#if LIBVNCSERVER_HAVE_X509_PRINT_EX_FP
|
|
X509_print_ex_fp(cr, x, 0, XN_FLAG_MULTILINE);
|
|
#else
|
|
rfbLog("** not compiled with libssl X509_print_ex_fp() function **\n");
|
|
if (users_list && strstr(users_list, "sslpeer=")) {
|
|
rfbLog("** -users sslpeer= will not work! **\n");
|
|
}
|
|
#endif
|
|
fclose(cr);
|
|
}
|
|
}
|
|
}
|
|
free(name);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void symmetric_encryption_xfer(int csock, int s_in, int s_out);
|
|
|
|
static void ssl_xfer(int csock, int s_in, int s_out, int is_https) {
|
|
int dbxfer = 0, db = 0, check_pending, fdmax, nfd, n, i, err;
|
|
char cbuf[ABSIZE], sbuf[ABSIZE];
|
|
int cptr, sptr, c_rd, c_wr, s_rd, s_wr;
|
|
fd_set rd, wr;
|
|
struct timeval tv;
|
|
int ssock, cnt = 0, ndata = 0;
|
|
|
|
/*
|
|
* we want to switch to a longer timeout for long term VNC
|
|
* connections (in case the network is not working for periods of
|
|
* time), but we also want the timeout shorter at the beginning
|
|
* in case the client went away.
|
|
*/
|
|
double start, now;
|
|
int tv_https_early = 60;
|
|
int tv_https_later = 20;
|
|
int tv_vnc_early = 40;
|
|
int tv_vnc_later = 43200; /* was 300, stunnel: 43200 */
|
|
int tv_cutover = 70;
|
|
int tv_closing = 60;
|
|
int tv_use;
|
|
|
|
if (dbxfer) {
|
|
raw_xfer(csock, s_in, s_out);
|
|
return;
|
|
}
|
|
if (enc_str != NULL) {
|
|
if (!strcmp(enc_str, "none")) {
|
|
usleep(250*1000);
|
|
rfbLog("doing '-enc none' raw transfer (no encryption)\n");
|
|
raw_xfer(csock, s_in, s_out);
|
|
} else {
|
|
symmetric_encryption_xfer(csock, s_in, s_out);
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (getenv("SSL_DEBUG")) {
|
|
db = atoi(getenv("SSL_DEBUG"));
|
|
}
|
|
|
|
if (db) fprintf(stderr, "ssl_xfer begin\n");
|
|
|
|
start = dnow();
|
|
if (is_https) {
|
|
tv_use = tv_https_early;
|
|
} else {
|
|
tv_use = tv_vnc_early;
|
|
}
|
|
|
|
|
|
/*
|
|
* csock: clear text socket with libvncserver. "C"
|
|
* ssock: ssl data socket with remote vnc viewer. "S"
|
|
*
|
|
* to cover inetd mode, we have s_in and s_out, but in non-inetd
|
|
* mode they both ssock.
|
|
*
|
|
* cbuf[] is data from csock that we have read but not passed on to ssl
|
|
* sbuf[] is data from ssl that we have read but not passed on to csock
|
|
*/
|
|
for (i=0; i<ABSIZE; i++) {
|
|
cbuf[i] = '\0';
|
|
sbuf[i] = '\0';
|
|
}
|
|
|
|
if (s_out > s_in) {
|
|
ssock = s_out;
|
|
} else {
|
|
ssock = s_in;
|
|
}
|
|
|
|
if (csock > ssock) {
|
|
fdmax = csock;
|
|
} else {
|
|
fdmax = ssock;
|
|
}
|
|
|
|
c_rd = 1; /* clear text (libvncserver) socket open for reading */
|
|
c_wr = 1; /* clear text (libvncserver) socket open for writing */
|
|
s_rd = 1; /* ssl data (remote client) socket open for reading */
|
|
s_wr = 1; /* ssl data (remote client) socket open for writing */
|
|
|
|
cptr = 0; /* offsets into ABSIZE buffers */
|
|
sptr = 0;
|
|
|
|
if (vencrypt_selected > 0 || anontls_selected > 0) {
|
|
char tmp[16];
|
|
/* read and discard the extra RFB version */
|
|
memset(tmp, 0, sizeof(tmp));
|
|
read(csock, tmp, 12);
|
|
if (0) fprintf(stderr, "extra: %s\n", tmp);
|
|
}
|
|
|
|
while (1) {
|
|
int c_to_s, s_to_c, closing;
|
|
|
|
if ( s_wr && (c_rd || cptr > 0) ) {
|
|
/*
|
|
* S is writable and
|
|
* C is readable or some cbuf data remaining
|
|
*/
|
|
c_to_s = 1;
|
|
} else {
|
|
c_to_s = 0;
|
|
}
|
|
|
|
if ( c_wr && (s_rd || sptr > 0) ) {
|
|
/*
|
|
* C is writable and
|
|
* S is readable or some sbuf data remaining
|
|
*/
|
|
s_to_c = 1;
|
|
} else {
|
|
s_to_c = 0;
|
|
}
|
|
|
|
if (! c_to_s && ! s_to_c) {
|
|
/*
|
|
* nothing can be sent either direction.
|
|
* break out of the loop to finish all work.
|
|
*/
|
|
break;
|
|
}
|
|
cnt++;
|
|
|
|
/* set up the fd sets for the two sockets for read & write: */
|
|
|
|
FD_ZERO(&rd);
|
|
|
|
if (c_rd && cptr < ABSIZE) {
|
|
/* we could read more from C since cbuf is not full */
|
|
FD_SET(csock, &rd);
|
|
}
|
|
if (s_rd) {
|
|
/*
|
|
* we could read more from S since sbuf not full,
|
|
* OR ssl is waiting for more BIO to be able to
|
|
* read and we have some C data still buffered.
|
|
*/
|
|
if (sptr < ABSIZE || (cptr > 0 && SSL_want_read(ssl))) {
|
|
FD_SET(s_in, &rd);
|
|
}
|
|
}
|
|
|
|
FD_ZERO(&wr);
|
|
|
|
if (c_wr && sptr > 0) {
|
|
/* we could write more to C since sbuf is not empty */
|
|
FD_SET(csock, &wr);
|
|
}
|
|
if (s_wr) {
|
|
/*
|
|
* we could write more to S since cbuf not empty,
|
|
* OR ssl is waiting for more BIO to be able
|
|
* write and we haven't filled up sbuf yet.
|
|
*/
|
|
if (cptr > 0 || (sptr < ABSIZE && SSL_want_write(ssl))) {
|
|
FD_SET(s_out, &wr);
|
|
}
|
|
}
|
|
|
|
now = dnow();
|
|
if (tv_cutover && now > start + tv_cutover) {
|
|
rfbLog("SSL: ssl_xfer[%d]: tv_cutover: %d\n", getpid(),
|
|
tv_cutover);
|
|
tv_cutover = 0;
|
|
if (is_https) {
|
|
tv_use = tv_https_later;
|
|
} else {
|
|
tv_use = tv_vnc_later;
|
|
}
|
|
/* try to clean out some zombies if we can. */
|
|
ssl_helper_pid(0, -2);
|
|
}
|
|
if (ssl_timeout_secs > 0) {
|
|
tv_use = ssl_timeout_secs;
|
|
}
|
|
|
|
if ( (s_rd && c_rd) || cptr || sptr) {
|
|
closing = 0;
|
|
} else {
|
|
closing = 1;
|
|
tv_use = tv_closing;
|
|
}
|
|
|
|
tv.tv_sec = tv_use;
|
|
tv.tv_usec = 0;
|
|
|
|
/* do the select, repeat if interrupted */
|
|
do {
|
|
if (ssl_timeout_secs == 0) {
|
|
nfd = select(fdmax+1, &rd, &wr, NULL, NULL);
|
|
} else {
|
|
nfd = select(fdmax+1, &rd, &wr, NULL, &tv);
|
|
}
|
|
} while (nfd < 0 && errno == EINTR);
|
|
|
|
if (db > 1) fprintf(stderr, "nfd: %d\n", nfd);
|
|
|
|
if (0) fprintf(stderr, "nfd[%d]: %d w/r csock: %d %d s_in: %d %d\n", getpid(), nfd, FD_ISSET(csock, &wr), FD_ISSET(csock, &rd), FD_ISSET(s_out, &wr), FD_ISSET(s_in, &rd));
|
|
|
|
if (nfd < 0) {
|
|
rfbLog("SSL: ssl_xfer[%d]: select error: %d\n", getpid(), nfd);
|
|
perror("select");
|
|
/* connection finished */
|
|
goto done;
|
|
}
|
|
|
|
if (nfd == 0) {
|
|
if (!closing && tv_cutover && ndata > 25000) {
|
|
static int cn = 0;
|
|
/* probably ok, early windows iconify */
|
|
if (cn++ < 2) {
|
|
rfbLog("SSL: ssl_xfer[%d]: early time"
|
|
"out: %d\n", getpid(), ndata);
|
|
}
|
|
continue;
|
|
}
|
|
rfbLog("SSL: ssl_xfer[%d]: connection timedout. %d tv_use: %d\n",
|
|
getpid(), ndata, tv_use);
|
|
/* connection finished */
|
|
goto done;
|
|
}
|
|
|
|
/* used to see if SSL_pending() should be checked: */
|
|
check_pending = 0;
|
|
/* AUDIT */
|
|
|
|
if (c_wr && FD_ISSET(csock, &wr)) {
|
|
|
|
/* try to write some of our sbuf to C: */
|
|
n = write(csock, sbuf, sptr);
|
|
|
|
if (n < 0) {
|
|
if (errno != EINTR) {
|
|
/* connection finished */
|
|
goto done;
|
|
}
|
|
/* proceed */
|
|
} else if (n == 0) {
|
|
/* connection finished XXX double check */
|
|
goto done;
|
|
} else {
|
|
/* shift over the data in sbuf by n */
|
|
memmove(sbuf, sbuf + n, sptr - n);
|
|
if (sptr == ABSIZE) {
|
|
check_pending = 1;
|
|
}
|
|
sptr -= n;
|
|
|
|
if (! s_rd && sptr == 0) {
|
|
/* finished sending last of sbuf */
|
|
shutdown(csock, SHUT_WR);
|
|
c_wr = 0;
|
|
}
|
|
ndata += n;
|
|
}
|
|
}
|
|
|
|
if (s_wr) {
|
|
if ((cptr > 0 && FD_ISSET(s_out, &wr)) ||
|
|
(SSL_want_read(ssl) && FD_ISSET(s_in, &rd))) {
|
|
|
|
/* try to write some of our cbuf to S: */
|
|
|
|
n = SSL_write(ssl, cbuf, cptr);
|
|
err = SSL_get_error(ssl, n);
|
|
|
|
if (err == SSL_ERROR_NONE) {
|
|
/* shift over the data in cbuf by n */
|
|
memmove(cbuf, cbuf + n, cptr - n);
|
|
cptr -= n;
|
|
|
|
if (! c_rd && cptr == 0 && s_wr) {
|
|
/* finished sending last cbuf */
|
|
SSL_shutdown(ssl);
|
|
s_wr = 0;
|
|
}
|
|
ndata += n;
|
|
|
|
} else if (err == SSL_ERROR_WANT_WRITE
|
|
|| err == SSL_ERROR_WANT_READ
|
|
|| err == SSL_ERROR_WANT_X509_LOOKUP) {
|
|
|
|
; /* proceed */
|
|
|
|
} else if (err == SSL_ERROR_SYSCALL) {
|
|
if (n < 0 && errno != EINTR) {
|
|
/* connection finished */
|
|
goto done;
|
|
}
|
|
/* proceed */
|
|
} else if (err == SSL_ERROR_ZERO_RETURN) {
|
|
/* S finished */
|
|
s_rd = 0;
|
|
s_wr = 0;
|
|
} else if (err == SSL_ERROR_SSL) {
|
|
/* connection finished */
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (c_rd && FD_ISSET(csock, &rd)) {
|
|
|
|
|
|
/* try to read some data from C into our cbuf */
|
|
|
|
n = read(csock, cbuf + cptr, ABSIZE - cptr);
|
|
|
|
if (n < 0) {
|
|
if (errno != EINTR) {
|
|
/* connection finished */
|
|
goto done;
|
|
}
|
|
/* proceed */
|
|
} else if (n == 0) {
|
|
/* C is EOF */
|
|
c_rd = 0;
|
|
if (cptr == 0 && s_wr) {
|
|
/* and no more in cbuf to send */
|
|
SSL_shutdown(ssl);
|
|
s_wr = 0;
|
|
}
|
|
} else {
|
|
/* good */
|
|
|
|
cptr += n;
|
|
ndata += n;
|
|
}
|
|
}
|
|
|
|
if (s_rd) {
|
|
if ((sptr < ABSIZE && FD_ISSET(s_in, &rd)) ||
|
|
(SSL_want_write(ssl) && FD_ISSET(s_out, &wr)) ||
|
|
(check_pending && SSL_pending(ssl))) {
|
|
|
|
/* try to read some data from S into our sbuf */
|
|
|
|
n = SSL_read(ssl, sbuf + sptr, ABSIZE - sptr);
|
|
err = SSL_get_error(ssl, n);
|
|
|
|
if (err == SSL_ERROR_NONE) {
|
|
/* good */
|
|
|
|
sptr += n;
|
|
ndata += n;
|
|
|
|
} else if (err == SSL_ERROR_WANT_WRITE
|
|
|| err == SSL_ERROR_WANT_READ
|
|
|| err == SSL_ERROR_WANT_X509_LOOKUP) {
|
|
|
|
; /* proceed */
|
|
|
|
} else if (err == SSL_ERROR_SYSCALL) {
|
|
if (n < 0) {
|
|
if(errno != EINTR) {
|
|
/* connection finished */
|
|
goto done;
|
|
}
|
|
/* proceed */
|
|
} else {
|
|
/* S finished */
|
|
s_rd = 0;
|
|
s_wr = 0;
|
|
}
|
|
} else if (err == SSL_ERROR_ZERO_RETURN) {
|
|
/* S is EOF */
|
|
s_rd = 0;
|
|
if (cptr == 0 && s_wr) {
|
|
/* and no more in cbuf to send */
|
|
SSL_shutdown(ssl);
|
|
s_wr = 0;
|
|
}
|
|
if (sptr == 0 && c_wr) {
|
|
/* and no more in sbuf to send */
|
|
shutdown(csock, SHUT_WR);
|
|
c_wr = 0;
|
|
}
|
|
} else if (err == SSL_ERROR_SSL) {
|
|
/* connection finished */
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
done:
|
|
rfbLog("SSL: ssl_xfer[%d]: closing sockets %d, %d, %d\n",
|
|
getpid(), csock, s_in, s_out);
|
|
close(csock);
|
|
close(s_in);
|
|
close(s_out);
|
|
return;
|
|
}
|
|
|
|
#define MSZ 4096
|
|
static void init_prng(void) {
|
|
int db = 0, bytes, ubytes, fd;
|
|
char file[MSZ], dtmp[100];
|
|
unsigned int sr;
|
|
|
|
RAND_file_name(file, MSZ);
|
|
|
|
rfbLog("RAND_file_name: %s\n", file);
|
|
|
|
bytes = RAND_load_file(file, -1);
|
|
if (db) fprintf(stderr, "bytes read: %d\n", bytes);
|
|
|
|
ubytes = RAND_load_file("/dev/urandom", 64);
|
|
bytes += ubytes;
|
|
if (db) fprintf(stderr, "bytes read: %d / %d\n", bytes, ubytes);
|
|
|
|
/* mix in more predictable stuff as well for fallback */
|
|
sprintf(dtmp, "/tmp/p%.8f.XXXXXX", dnow());
|
|
fd = mkstemp(dtmp);
|
|
RAND_add(dtmp, strlen(dtmp), 0);
|
|
if (fd >= 0) {
|
|
close(fd);
|
|
unlink(dtmp);
|
|
}
|
|
sprintf(dtmp, "%d-%.8f", (int) getpid(), dnow());
|
|
RAND_add(dtmp, strlen(dtmp), 0);
|
|
|
|
if (!RAND_status()) {
|
|
ubytes = -1;
|
|
rfbLog("calling RAND_poll()\n");
|
|
RAND_poll();
|
|
}
|
|
|
|
RAND_bytes((unsigned char *)&sr, 4);
|
|
srand(sr);
|
|
|
|
if (bytes > 0) {
|
|
if (! quiet) {
|
|
rfbLog("initialized PRNG with %d random bytes.\n",
|
|
bytes);
|
|
}
|
|
if (ubytes > 32 && rnow() < 0.25) {
|
|
RAND_write_file(file);
|
|
}
|
|
return;
|
|
}
|
|
|
|
bytes += RAND_load_file("/dev/random", 8);
|
|
if (db) fprintf(stderr, "bytes read: %d\n", bytes);
|
|
RAND_poll();
|
|
|
|
if (! quiet) {
|
|
rfbLog("initialized PRNG with %d random bytes.\n", bytes);
|
|
}
|
|
}
|
|
#endif /* FORK_OK */
|
|
#endif /* LIBVNCSERVER_HAVE_LIBSSL */
|
|
|
|
void check_openssl(void) {
|
|
fd_set fds;
|
|
struct timeval tv;
|
|
int nfds, nmax = openssl_sock;
|
|
static time_t last_waitall = 0;
|
|
static double last_check = 0.0;
|
|
double now;
|
|
|
|
if (! use_openssl) {
|
|
return;
|
|
}
|
|
|
|
if (time(NULL) > last_waitall + 120) {
|
|
last_waitall = time(NULL);
|
|
ssl_helper_pid(0, -2); /* waitall */
|
|
}
|
|
|
|
if (openssl_sock < 0 && openssl_sock6 < 0) {
|
|
return;
|
|
}
|
|
|
|
now = dnow();
|
|
if (now < last_check + 0.5) {
|
|
return;
|
|
}
|
|
last_check = now;
|
|
|
|
FD_ZERO(&fds);
|
|
if (openssl_sock >= 0) {
|
|
FD_SET(openssl_sock, &fds);
|
|
}
|
|
if (openssl_sock6 >= 0) {
|
|
FD_SET(openssl_sock6, &fds);
|
|
if (openssl_sock6 > openssl_sock) {
|
|
nmax = openssl_sock6;
|
|
}
|
|
}
|
|
|
|
tv.tv_sec = 0;
|
|
tv.tv_usec = 0;
|
|
|
|
nfds = select(nmax+1, &fds, NULL, NULL, &tv);
|
|
|
|
if (nfds <= 0) {
|
|
return;
|
|
}
|
|
|
|
if (openssl_sock >= 0 && FD_ISSET(openssl_sock, &fds)) {
|
|
rfbLog("SSL: accept_openssl(OPENSSL_VNC)\n");
|
|
accept_openssl(OPENSSL_VNC, -1);
|
|
}
|
|
if (openssl_sock6 >= 0 && FD_ISSET(openssl_sock6, &fds)) {
|
|
rfbLog("SSL: accept_openssl(OPENSSL_VNC6)\n");
|
|
accept_openssl(OPENSSL_VNC6, -1);
|
|
}
|
|
}
|
|
|
|
void check_https(void) {
|
|
fd_set fds;
|
|
struct timeval tv;
|
|
int nfds, nmax = https_sock;
|
|
static double last_check = 0.0;
|
|
double now;
|
|
|
|
if (! use_openssl || (https_sock < 0 && https_sock6 < 0)) {
|
|
return;
|
|
}
|
|
|
|
now = dnow();
|
|
if (now < last_check + 0.5) {
|
|
return;
|
|
}
|
|
last_check = now;
|
|
|
|
FD_ZERO(&fds);
|
|
if (https_sock >= 0) {
|
|
FD_SET(https_sock, &fds);
|
|
}
|
|
if (https_sock6 >= 0) {
|
|
FD_SET(https_sock6, &fds);
|
|
if (https_sock6 > https_sock) {
|
|
nmax = https_sock6;
|
|
}
|
|
}
|
|
|
|
tv.tv_sec = 0;
|
|
tv.tv_usec = 0;
|
|
|
|
nfds = select(nmax+1, &fds, NULL, NULL, &tv);
|
|
|
|
if (nfds <= 0) {
|
|
return;
|
|
}
|
|
|
|
if (https_sock >= 0 && FD_ISSET(https_sock, &fds)) {
|
|
rfbLog("SSL: accept_openssl(OPENSSL_HTTPS)\n");
|
|
accept_openssl(OPENSSL_HTTPS, -1);
|
|
}
|
|
if (https_sock6 >= 0 && FD_ISSET(https_sock6, &fds)) {
|
|
rfbLog("SSL: accept_openssl(OPENSSL_HTTPS6)\n");
|
|
accept_openssl(OPENSSL_HTTPS6, -1);
|
|
}
|
|
}
|
|
|
|
void openssl_port(int restart) {
|
|
int sock = -1, shutdown = 0;
|
|
static int port = -1;
|
|
static in_addr_t iface = INADDR_ANY;
|
|
int db = 0, fd6 = -1;
|
|
|
|
if (! screen) {
|
|
rfbLog("openssl_port: no screen!\n");
|
|
clean_up_exit(1);
|
|
}
|
|
if (inetd) {
|
|
ssl_initialized = 1;
|
|
return;
|
|
}
|
|
|
|
if (ipv6_listen && screen->port <= 0) {
|
|
if (got_rfbport) {
|
|
screen->port = got_rfbport_val;
|
|
} else {
|
|
int ap = 5900;
|
|
if (auto_port > 0) {
|
|
ap = auto_port;
|
|
}
|
|
screen->port = find_free_port6(ap, ap+200);
|
|
}
|
|
rfbLog("openssl_port: reset port from 0 => %d\n", screen->port);
|
|
}
|
|
|
|
if (restart) {
|
|
port = screen->port;
|
|
} else if (screen->listenSock > -1 && screen->port > 0) {
|
|
port = screen->port;
|
|
shutdown = 1;
|
|
} else if (ipv6_listen && screen->port > 0) {
|
|
port = screen->port;
|
|
} else if (screen->port == 0) {
|
|
port = screen->port;
|
|
}
|
|
|
|
iface = screen->listenInterface;
|
|
|
|
if (shutdown) {
|
|
if (db) fprintf(stderr, "shutting down %d/%d\n",
|
|
port, screen->listenSock);
|
|
#if LIBVNCSERVER_HAS_SHUTDOWNSOCKETS
|
|
rfbShutdownSockets(screen);
|
|
#endif
|
|
}
|
|
|
|
if (openssl_sock >= 0) {
|
|
close(openssl_sock);
|
|
openssl_sock = -1;
|
|
}
|
|
if (openssl_sock6 >= 0) {
|
|
close(openssl_sock6);
|
|
openssl_sock6 = -1;
|
|
}
|
|
|
|
if (port < 0) {
|
|
rfbLog("openssl_port: could not obtain listening port %d\n", port);
|
|
if (!got_rfbport && !got_ipv6_listen) {
|
|
rfbLog("openssl_port: if this system is IPv6-only, use the -6 option\n");
|
|
}
|
|
clean_up_exit(1);
|
|
} else if (port == 0) {
|
|
/* no listen case, i.e. -connect */
|
|
sock = -1;
|
|
} else {
|
|
sock = listen_tcp(port, iface, 0);
|
|
if (ipv6_listen) {
|
|
fd6 = listen6(port);
|
|
} else if (!got_rfbport && !got_ipv6_listen) {
|
|
if (sock < 0) {
|
|
rfbLog("openssl_port: if this system is IPv6-only, use the -6 option\n");
|
|
}
|
|
}
|
|
if (sock < 0) {
|
|
if (fd6 < 0) {
|
|
rfbLog("openssl_port: could not reopen port %d\n", port);
|
|
if (!restart) {
|
|
clean_up_exit(1);
|
|
}
|
|
} else {
|
|
rfbLog("openssl_port: Info: listening on IPv6 only.\n");
|
|
}
|
|
}
|
|
}
|
|
rfbLog("openssl_port: listen on port/sock %d/%d\n", port, sock);
|
|
if (ipv6_listen && port > 0) {
|
|
if (fd6 < 0) {
|
|
fd6 = listen6(port);
|
|
}
|
|
if (fd6 < 0) {
|
|
ipv6_listen = 0;
|
|
} else {
|
|
rfbLog("openssl_port: listen on port/sock %d/%d (ipv6)\n",
|
|
port, fd6);
|
|
openssl_sock6 = fd6;
|
|
}
|
|
}
|
|
if (!quiet && sock >=0) {
|
|
announce(port, 1, NULL);
|
|
}
|
|
openssl_sock = sock;
|
|
openssl_port_num = port;
|
|
|
|
ssl_initialized = 1;
|
|
}
|
|
|
|
void https_port(int restart) {
|
|
int sock, fd6 = -1;
|
|
static int port = 0;
|
|
static in_addr_t iface = INADDR_ANY;
|
|
|
|
/* as openssl_port above: open a listening socket for pure https: */
|
|
if (https_port_num < 0) {
|
|
return;
|
|
}
|
|
if (! screen) {
|
|
rfbLog("https_port: no screen!\n");
|
|
clean_up_exit(1);
|
|
}
|
|
if (! screen->httpDir) {
|
|
return;
|
|
}
|
|
if (screen->listenInterface) {
|
|
iface = screen->listenInterface;
|
|
}
|
|
|
|
if (https_port_num == 0) {
|
|
https_port_num = find_free_port(5801, 5851);
|
|
}
|
|
if (ipv6_listen && https_port_num <= 0) {
|
|
https_port_num = find_free_port6(5801, 5851);
|
|
}
|
|
if (https_port_num <= 0) {
|
|
rfbLog("https_port: could not find port %d\n", https_port_num);
|
|
clean_up_exit(1);
|
|
}
|
|
port = https_port_num;
|
|
|
|
if (port <= 0) {
|
|
rfbLog("https_port: could not obtain listening port %d\n", port);
|
|
if (!restart) {
|
|
clean_up_exit(1);
|
|
} else {
|
|
return;
|
|
}
|
|
}
|
|
if (https_sock >= 0) {
|
|
close(https_sock);
|
|
https_sock = -1;
|
|
}
|
|
if (https_sock6 >= 0) {
|
|
close(https_sock6);
|
|
https_sock6 = -1;
|
|
}
|
|
sock = listen_tcp(port, iface, 0);
|
|
if (sock < 0) {
|
|
rfbLog("https_port: could not open port %d\n", port);
|
|
if (ipv6_listen) {
|
|
fd6 = listen6(port);
|
|
}
|
|
if (fd6 < 0) {
|
|
if (!restart) {
|
|
clean_up_exit(1);
|
|
}
|
|
}
|
|
rfbLog("https_port: trying IPv6 only mode.\n");
|
|
}
|
|
rfbLog("https_port: listen on port/sock %d/%d\n", port, sock);
|
|
https_sock = sock;
|
|
|
|
if (ipv6_listen) {
|
|
if (fd6 < 0) {
|
|
fd6 = listen6(port);
|
|
}
|
|
if (fd6 < 0) {
|
|
;
|
|
} else {
|
|
rfbLog("https_port: listen on port/sock %d/%d (ipv6)\n",
|
|
port, fd6);
|
|
https_sock6 = fd6;
|
|
}
|
|
if (fd6 < 0 && https_sock < 0) {
|
|
rfbLog("https_port: could not listen on either IPv4 or IPv6.\n");
|
|
if (!restart) {
|
|
clean_up_exit(1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void lose_ram(void) {
|
|
/*
|
|
* for a forked child that will be around for a long time
|
|
* without doing exec(). we really should re-exec, but a pain
|
|
* to redo all SSL ctx.
|
|
*/
|
|
free_old_fb();
|
|
|
|
free_tiles();
|
|
}
|
|
|
|
/* utility to keep track of existing helper processes: */
|
|
|
|
void ssl_helper_pid(pid_t pid, int sock) {
|
|
# define HPSIZE 256
|
|
static pid_t helpers[HPSIZE];
|
|
static int sockets[HPSIZE], first = 1;
|
|
int i, empty, set, status;
|
|
static int db = 0;
|
|
|
|
if (first) {
|
|
for (i=0; i < HPSIZE; i++) {
|
|
helpers[i] = 0;
|
|
sockets[i] = 0;
|
|
}
|
|
if (getenv("SSL_HELPER_PID_DB")) {
|
|
db = 1;
|
|
}
|
|
first = 0;
|
|
}
|
|
|
|
|
|
if (pid == 0) {
|
|
/* killall or waitall */
|
|
for (i=0; i < HPSIZE; i++) {
|
|
if (helpers[i] == 0) {
|
|
sockets[i] = -1;
|
|
continue;
|
|
}
|
|
if (kill(helpers[i], 0) == 0) {
|
|
int kret = -2;
|
|
pid_t wret;
|
|
if (sock != -2) {
|
|
if (sockets[i] >= 0) {
|
|
close(sockets[i]);
|
|
}
|
|
kret = kill(helpers[i], SIGTERM);
|
|
if (kret == 0) {
|
|
usleep(20 * 1000);
|
|
}
|
|
}
|
|
|
|
#if LIBVNCSERVER_HAVE_SYS_WAIT_H && LIBVNCSERVER_HAVE_WAITPID
|
|
wret = waitpid(helpers[i], &status, WNOHANG);
|
|
|
|
if (db) fprintf(stderr, "waitpid(%d)\n", helpers[i]);
|
|
if (db) fprintf(stderr, " waitret1=%d\n", wret);
|
|
|
|
if (kret == 0 && wret != helpers[i]) {
|
|
int k;
|
|
for (k=0; k < 10; k++) {
|
|
usleep(100 * 1000);
|
|
wret = waitpid(helpers[i], &status, WNOHANG);
|
|
if (db) fprintf(stderr, " waitret2=%d\n", wret);
|
|
if (wret == helpers[i]) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
if (sock == -2) {
|
|
continue;
|
|
}
|
|
}
|
|
helpers[i] = 0;
|
|
sockets[i] = -1;
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (db) fprintf(stderr, "ssl_helper_pid(%d, %d)\n", pid, sock);
|
|
|
|
/* add (or delete for sock == -1) */
|
|
set = 0;
|
|
empty = -1;
|
|
for (i=0; i < HPSIZE; i++) {
|
|
if (helpers[i] == pid) {
|
|
if (sock == -1) {
|
|
#if LIBVNCSERVER_HAVE_SYS_WAIT_H && LIBVNCSERVER_HAVE_WAITPID
|
|
pid_t wret;
|
|
wret = waitpid(helpers[i], &status, WNOHANG);
|
|
|
|
if (db) fprintf(stderr, "waitpid(%d) 2\n", helpers[i]);
|
|
if (db) fprintf(stderr, " waitret1=%d\n", wret);
|
|
#endif
|
|
helpers[i] = 0;
|
|
}
|
|
sockets[i] = sock;
|
|
set = 1;
|
|
} else if (empty == -1 && helpers[i] == 0) {
|
|
empty = i;
|
|
}
|
|
}
|
|
if (set || sock == -1) {
|
|
return; /* done */
|
|
}
|
|
|
|
/* now try to store */
|
|
if (empty >= 0) {
|
|
helpers[empty] = pid;
|
|
sockets[empty] = sock;
|
|
return;
|
|
}
|
|
for (i=0; i < HPSIZE; i++) {
|
|
if (helpers[i] == 0) {
|
|
continue;
|
|
}
|
|
/* clear out stale pids: */
|
|
if (kill(helpers[i], 0) != 0) {
|
|
helpers[i] = 0;
|
|
sockets[i] = -1;
|
|
|
|
if (empty == -1) {
|
|
empty = i;
|
|
}
|
|
}
|
|
}
|
|
if (empty >= 0) {
|
|
helpers[empty] = pid;
|
|
sockets[empty] = sock;
|
|
}
|
|
}
|
|
|
|
static int is_ssl_readable(int s_in, double last_https, char *last_get,
|
|
int mode) {
|
|
int nfd, db = 0;
|
|
struct timeval tv;
|
|
fd_set rd;
|
|
|
|
if (getenv("ACCEPT_OPENSSL_DEBUG")) {
|
|
db = atoi(getenv("ACCEPT_OPENSSL_DEBUG"));
|
|
}
|
|
|
|
/*
|
|
* we'll do a select() on s_in for reading. this is not an
|
|
* absolute proof that SSL_read is ready (XXX use SSL utility).
|
|
*/
|
|
tv.tv_sec = 2;
|
|
tv.tv_usec = 0;
|
|
|
|
if (mode == OPENSSL_INETD) {
|
|
/*
|
|
* https via inetd is icky because x11vnc is restarted
|
|
* for each socket (and some clients send requests
|
|
* rapid fire).
|
|
*/
|
|
tv.tv_sec = 4;
|
|
}
|
|
|
|
/*
|
|
* increase the timeout if we know HTTP traffic has occurred
|
|
* recently:
|
|
*/
|
|
if (dnow() < last_https + 30.0) {
|
|
tv.tv_sec = 10;
|
|
if (last_get && strstr(last_get, "VncViewer")) {
|
|
tv.tv_sec = 5;
|
|
}
|
|
}
|
|
if (getenv("X11VNC_HTTPS_VS_VNC_TIMEOUT")) {
|
|
tv.tv_sec = atoi(getenv("X11VNC_HTTPS_VS_VNC_TIMEOUT"));
|
|
}
|
|
if (db) fprintf(stderr, "tv_sec: %d - '%s'\n", (int) tv.tv_sec, last_get);
|
|
|
|
FD_ZERO(&rd);
|
|
FD_SET(s_in, &rd);
|
|
|
|
if (db) fprintf(stderr, "is_ssl_readable: begin select(%d secs) %.6f\n", (int) tv.tv_sec, dnow());
|
|
do {
|
|
nfd = select(s_in+1, &rd, NULL, NULL, &tv);
|
|
} while (nfd < 0 && errno == EINTR);
|
|
if (db) fprintf(stderr, "is_ssl_readable: finish select(%d secs) %.6f\n", (int) tv.tv_sec, dnow());
|
|
|
|
if (db) fprintf(stderr, "https nfd: %d\n", nfd);
|
|
|
|
if (nfd <= 0 || ! FD_ISSET(s_in, &rd)) {
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int watch_for_http_traffic(char *buf_a, int *n_a, int raw_sock) {
|
|
int is_http, err, n, n2;
|
|
char *buf;
|
|
int db = 0;
|
|
/*
|
|
* sniff the first couple bytes of the stream and try to see
|
|
* if it is http or not. if we read them OK, we must read the
|
|
* rest of the available data otherwise we may deadlock.
|
|
* what has been read is returned in buf_a and n_a.
|
|
* *buf_a is ABSIZE+1 long and zeroed.
|
|
*/
|
|
if (getenv("ACCEPT_OPENSSL_DEBUG")) {
|
|
db = atoi(getenv("ACCEPT_OPENSSL_DEBUG"));
|
|
}
|
|
if (! buf_a || ! n_a) {
|
|
return 0;
|
|
}
|
|
|
|
buf = (char *) calloc((ABSIZE+1), 1);
|
|
*n_a = 0;
|
|
|
|
if (enc_str && !strcmp(enc_str, "none")) {
|
|
n = read(raw_sock, buf, 2);
|
|
err = SSL_ERROR_NONE;
|
|
} else {
|
|
#if LIBVNCSERVER_HAVE_LIBSSL
|
|
n = SSL_read(ssl, buf, 2);
|
|
err = SSL_get_error(ssl, n);
|
|
#else
|
|
err = n = 0;
|
|
badnews("1 in watch_for_http_traffic");
|
|
#endif
|
|
}
|
|
|
|
if (err != SSL_ERROR_NONE || n < 2) {
|
|
if (n > 0) {
|
|
strncpy(buf_a, buf, n);
|
|
*n_a = n;
|
|
}
|
|
if (db) fprintf(stderr, "watch_for_http_traffic ssl err: %d/%d\n", err, n);
|
|
return -1;
|
|
}
|
|
|
|
/* look for GET, HEAD, POST, CONNECT */
|
|
is_http = 0;
|
|
if (!strncmp("GE", buf, 2)) {
|
|
is_http = 1;
|
|
} else if (!strncmp("HE", buf, 2)) {
|
|
is_http = 1;
|
|
} else if (!strncmp("PO", buf, 2)) {
|
|
is_http = 1;
|
|
} else if (!strncmp("CO", buf, 2)) {
|
|
is_http = 1;
|
|
}
|
|
if (db) fprintf(stderr, "watch_for_http_traffic read: '%s' %d\n", buf, n);
|
|
|
|
/*
|
|
* better read all we can and fwd it along to avoid blocking
|
|
* in ssl_xfer().
|
|
*/
|
|
|
|
if (enc_str && !strcmp(enc_str, "none")) {
|
|
n2 = read(raw_sock, buf + n, ABSIZE - n);
|
|
} else {
|
|
#if LIBVNCSERVER_HAVE_LIBSSL
|
|
n2 = SSL_read(ssl, buf + n, ABSIZE - n);
|
|
#else
|
|
n2 = 0;
|
|
badnews("2 in watch_for_http_traffic");
|
|
#endif
|
|
}
|
|
if (n2 >= 0) {
|
|
n += n2;
|
|
}
|
|
|
|
*n_a = n;
|
|
|
|
if (db) fprintf(stderr, "watch_for_http_traffic readmore: %d\n", n2);
|
|
|
|
if (n > 0) {
|
|
memcpy(buf_a, buf, n);
|
|
}
|
|
if (db > 1) {
|
|
fprintf(stderr, "watch_for_http_traffic readmore: ");
|
|
write(2, buf_a, *n_a);
|
|
fprintf(stderr, "\n");
|
|
}
|
|
if (db) fprintf(stderr, "watch_for_http_traffic return: %d\n", is_http);
|
|
return is_http;
|
|
}
|
|
|
|
static int csock_timeout_sock = -1;
|
|
|
|
static void csock_timeout (int sig) {
|
|
rfbLog("sig: %d, csock_timeout.\n", sig);
|
|
if (csock_timeout_sock >= 0) {
|
|
close(csock_timeout_sock);
|
|
csock_timeout_sock = -1;
|
|
}
|
|
}
|
|
|
|
static int check_ssl_access(char *addr) {
|
|
static char *save_allow_once = NULL;
|
|
static time_t time_allow_once = 0;
|
|
|
|
/* due to "Fetch Cert" activities for SSL really need to "allow twice" */
|
|
if (allow_once != NULL) {
|
|
save_allow_once = strdup(allow_once);
|
|
time_allow_once = time(NULL);
|
|
} else if (save_allow_once != NULL) {
|
|
if (getenv("X11VNC_NO_SSL_ALLOW_TWICE")) {
|
|
;
|
|
} else if (time(NULL) < time_allow_once + 30) {
|
|
/* give them 30 secs to check and save the fetched cert. */
|
|
allow_once = save_allow_once;
|
|
rfbLog("SSL: Permitting 30 sec grace period for allowonce.\n");
|
|
rfbLog("SSL: Set X11VNC_NO_SSL_ALLOW_TWICE=1 to disable.\n");
|
|
}
|
|
save_allow_once = NULL;
|
|
time_allow_once = 0;
|
|
}
|
|
|
|
return check_access(addr);
|
|
}
|
|
|
|
void accept_openssl(int mode, int presock) {
|
|
int sock = -1, listen = -1, cport, csock, vsock;
|
|
int peerport = 0;
|
|
int status, n, i, db = 0;
|
|
struct sockaddr_in addr;
|
|
#ifdef __hpux
|
|
int addrlen = sizeof(addr);
|
|
#else
|
|
socklen_t addrlen = sizeof(addr);
|
|
#endif
|
|
rfbClientPtr client;
|
|
pid_t pid;
|
|
char uniq[] = "_evilrats_";
|
|
char cookie[256], rcookie[256], *name = NULL;
|
|
int vencrypt_sel = 0;
|
|
int anontls_sel = 0;
|
|
char *ipv6_name = NULL;
|
|
static double last_https = 0.0;
|
|
static char last_get[256];
|
|
static int first = 1;
|
|
unsigned char *rb;
|
|
|
|
#if !LIBVNCSERVER_HAVE_LIBSSL
|
|
if (enc_str == NULL || strcmp(enc_str, "none")) {
|
|
badnews("0 accept_openssl");
|
|
}
|
|
#endif
|
|
|
|
openssl_last_helper_pid = 0;
|
|
|
|
/* zero buffers for use below. */
|
|
for (i=0; i<256; i++) {
|
|
if (first) {
|
|
last_get[i] = '\0';
|
|
}
|
|
cookie[i] = '\0';
|
|
rcookie[i] = '\0';
|
|
}
|
|
first = 0;
|
|
|
|
if (getenv("ACCEPT_OPENSSL_DEBUG")) {
|
|
db = atoi(getenv("ACCEPT_OPENSSL_DEBUG"));
|
|
}
|
|
|
|
/* do INETD, VNC, or HTTPS cases (result is client socket or pipe) */
|
|
if (mode == OPENSSL_INETD) {
|
|
ssl_initialized = 1;
|
|
|
|
} else if (mode == OPENSSL_VNC) {
|
|
sock = accept(openssl_sock, (struct sockaddr *)&addr, &addrlen);
|
|
if (sock < 0) {
|
|
rfbLog("SSL: accept_openssl: accept connection failed\n");
|
|
rfbLogPerror("accept");
|
|
if (ssl_no_fail) {
|
|
clean_up_exit(1);
|
|
}
|
|
return;
|
|
}
|
|
listen = openssl_sock;
|
|
|
|
} else if (mode == OPENSSL_VNC6 || mode == OPENSSL_HTTPS6) {
|
|
#if X11VNC_IPV6
|
|
struct sockaddr_in6 a6;
|
|
socklen_t a6len = sizeof(a6);
|
|
int fd = (mode == OPENSSL_VNC6 ? openssl_sock6 : https_sock6);
|
|
|
|
sock = accept(fd, (struct sockaddr *)&a6, &a6len);
|
|
if (sock < 0) {
|
|
rfbLog("SSL: accept_openssl: accept connection failed\n");
|
|
rfbLogPerror("accept");
|
|
if (ssl_no_fail) {
|
|
clean_up_exit(1);
|
|
}
|
|
return;
|
|
}
|
|
ipv6_name = ipv6_getipaddr((struct sockaddr *)&a6, a6len);
|
|
if (!ipv6_name) ipv6_name = strdup("unknown");
|
|
listen = fd;
|
|
#endif
|
|
} else if (mode == OPENSSL_REVERSE) {
|
|
sock = presock;
|
|
if (sock < 0) {
|
|
rfbLog("SSL: accept_openssl: connection failed\n");
|
|
if (ssl_no_fail) {
|
|
clean_up_exit(1);
|
|
}
|
|
return;
|
|
}
|
|
if (getenv("OPENSSL_REVERSE_DEBUG")) fprintf(stderr, "OPENSSL_REVERSE: ipv6_client_ip_str: %s\n", ipv6_client_ip_str);
|
|
if (ipv6_client_ip_str != NULL) {
|
|
ipv6_name = strdup(ipv6_client_ip_str);
|
|
}
|
|
listen = -1;
|
|
|
|
} else if (mode == OPENSSL_HTTPS) {
|
|
sock = accept(https_sock, (struct sockaddr *)&addr, &addrlen);
|
|
if (sock < 0) {
|
|
rfbLog("SSL: accept_openssl: accept connection failed\n");
|
|
rfbLogPerror("accept");
|
|
if (ssl_no_fail) {
|
|
clean_up_exit(1);
|
|
}
|
|
return;
|
|
}
|
|
listen = https_sock;
|
|
}
|
|
if (db) fprintf(stderr, "SSL: accept_openssl: sock: %d\n", sock);
|
|
|
|
if (openssl_last_ip) {
|
|
free(openssl_last_ip);
|
|
openssl_last_ip = NULL;
|
|
}
|
|
if (mode == OPENSSL_INETD) {
|
|
openssl_last_ip = get_remote_host(fileno(stdin));
|
|
} else if (mode == OPENSSL_VNC6 || mode == OPENSSL_HTTPS6) {
|
|
openssl_last_ip = ipv6_name;
|
|
} else if (mode == OPENSSL_REVERSE && ipv6_name != NULL) {
|
|
openssl_last_ip = ipv6_name;
|
|
} else {
|
|
openssl_last_ip = get_remote_host(sock);
|
|
}
|
|
|
|
if (!check_ssl_access(openssl_last_ip)) {
|
|
rfbLog("SSL: accept_openssl: denying client %s\n", openssl_last_ip);
|
|
rfbLog("SSL: accept_openssl: does not match -allow or other reason.\n");
|
|
close(sock);
|
|
sock = -1;
|
|
if (ssl_no_fail) {
|
|
clean_up_exit(1);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/* now make a listening socket for child to connect back to us by: */
|
|
|
|
cport = find_free_port(20000, 22000);
|
|
if (! cport && ipv6_listen) {
|
|
rfbLog("SSL: accept_openssl: seeking IPv6 port.\n");
|
|
cport = find_free_port6(20000, 22000);
|
|
rfbLog("SSL: accept_openssl: IPv6 port: %d\n", cport);
|
|
}
|
|
if (! cport) {
|
|
rfbLog("SSL: accept_openssl: could not find open port.\n");
|
|
close(sock);
|
|
if (mode == OPENSSL_INETD || ssl_no_fail) {
|
|
clean_up_exit(1);
|
|
}
|
|
return;
|
|
}
|
|
if (db) fprintf(stderr, "accept_openssl: cport: %d\n", cport);
|
|
|
|
csock = listen_tcp(cport, htonl(INADDR_LOOPBACK), 1);
|
|
|
|
if (csock < 0) {
|
|
rfbLog("SSL: accept_openssl: could not listen on port %d.\n",
|
|
cport);
|
|
close(sock);
|
|
if (mode == OPENSSL_INETD || ssl_no_fail) {
|
|
clean_up_exit(1);
|
|
}
|
|
return;
|
|
}
|
|
if (db) fprintf(stderr, "accept_openssl: csock: %d\n", csock);
|
|
|
|
fflush(stderr);
|
|
|
|
/*
|
|
* make a simple cookie to id the child socket, not foolproof
|
|
* but hard to guess exactly (just worrying about local lusers
|
|
* here, since we use INADDR_LOOPBACK).
|
|
*/
|
|
rb = (unsigned char *) calloc(6, 1);
|
|
#if LIBVNCSERVER_HAVE_LIBSSL
|
|
RAND_bytes(rb, 6);
|
|
#endif
|
|
sprintf(cookie, "RB=%d%d%d%d%d%d/%f%f/%p",
|
|
rb[0], rb[1], rb[2], rb[3], rb[4], rb[5],
|
|
dnow() - x11vnc_start, x11vnc_start, (void *)rb);
|
|
|
|
if (mode == OPENSSL_VNC6) {
|
|
name = strdup(ipv6_name);
|
|
peerport = get_remote_port(sock);
|
|
} else if (mode == OPENSSL_REVERSE && ipv6_name != NULL) {
|
|
name = strdup(ipv6_name);
|
|
peerport = get_remote_port(sock);
|
|
} else if (mode != OPENSSL_INETD) {
|
|
name = get_remote_host(sock);
|
|
peerport = get_remote_port(sock);
|
|
} else {
|
|
openssl_last_ip = get_remote_host(fileno(stdin));
|
|
peerport = get_remote_port(fileno(stdin));
|
|
if (openssl_last_ip) {
|
|
name = strdup(openssl_last_ip);
|
|
} else {
|
|
name = strdup("unknown");
|
|
}
|
|
}
|
|
if (name) {
|
|
if (mode == OPENSSL_INETD) {
|
|
rfbLog("SSL: (inetd) spawning helper process "
|
|
"to handle: %s:%d\n", name, peerport);
|
|
} else {
|
|
rfbLog("SSL: spawning helper process to handle: "
|
|
"%s:%d\n", name, peerport);
|
|
}
|
|
free(name);
|
|
name = NULL;
|
|
}
|
|
|
|
if (certret) {
|
|
free(certret);
|
|
}
|
|
if (certret_str) {
|
|
free(certret_str);
|
|
certret_str = NULL;
|
|
}
|
|
certret = strdup("/tmp/x11vnc-certret.XXXXXX");
|
|
omode = umask(077);
|
|
certret_fd = mkstemp(certret);
|
|
umask(omode);
|
|
if (certret_fd < 0) {
|
|
free(certret);
|
|
certret = NULL;
|
|
certret_fd = -1;
|
|
}
|
|
|
|
if (dhret) {
|
|
free(dhret);
|
|
}
|
|
if (dhret_str) {
|
|
free(dhret_str);
|
|
dhret_str = NULL;
|
|
}
|
|
dhret = strdup("/tmp/x11vnc-dhret.XXXXXX");
|
|
omode = umask(077);
|
|
dhret_fd = mkstemp(dhret);
|
|
umask(omode);
|
|
if (dhret_fd < 0) {
|
|
free(dhret);
|
|
dhret = NULL;
|
|
dhret_fd = -1;
|
|
}
|
|
|
|
/* now fork the child to handle the SSL: */
|
|
pid = fork();
|
|
|
|
if (pid > 0) {
|
|
rfbLog("SSL: helper for peerport %d is pid %d: \n",
|
|
peerport, (int) pid);
|
|
}
|
|
|
|
if (pid < 0) {
|
|
rfbLog("SSL: accept_openssl: could not fork.\n");
|
|
rfbLogPerror("fork");
|
|
close(sock);
|
|
close(csock);
|
|
if (mode == OPENSSL_INETD || ssl_no_fail) {
|
|
clean_up_exit(1);
|
|
}
|
|
return;
|
|
|
|
} else if (pid == 0) {
|
|
int s_in, s_out, httpsock = -1;
|
|
int vncsock;
|
|
int i, have_httpd = 0;
|
|
int f_in = fileno(stdin);
|
|
int f_out = fileno(stdout);
|
|
int skip_vnc_tls = mode == OPENSSL_HTTPS ? 1 : 0;
|
|
|
|
if (db) fprintf(stderr, "helper pid in: %d %d %d %d\n", f_in, f_out, sock, listen);
|
|
|
|
/* reset all handlers to default (no interrupted() calls) */
|
|
unset_signals();
|
|
|
|
/* close all non-essential fd's */
|
|
for (i=0; i<256; i++) {
|
|
if (mode == OPENSSL_INETD) {
|
|
if (i == f_in || i == f_out) {
|
|
continue;
|
|
}
|
|
}
|
|
if (i == sock) {
|
|
continue;
|
|
}
|
|
if (i == 2) {
|
|
continue;
|
|
}
|
|
close(i);
|
|
}
|
|
|
|
/*
|
|
* sadly, we are a long lived child and so the large
|
|
* framebuffer memory areas will soon differ from parent.
|
|
* try to free as much as possible.
|
|
*/
|
|
lose_ram();
|
|
|
|
/* now connect back to parent socket: */
|
|
vncsock = connect_tcp("127.0.0.1", cport);
|
|
if (vncsock < 0) {
|
|
rfbLog("SSL: ssl_helper[%d]: could not connect"
|
|
" back to: %d\n", getpid(), cport);
|
|
rfbLog("SSL: ssl_helper[%d]: exit case 1 (no local vncsock)\n", getpid());
|
|
exit(1);
|
|
}
|
|
if (db) fprintf(stderr, "vncsock %d\n", vncsock);
|
|
|
|
/* try to initialize SSL with the remote client */
|
|
|
|
if (mode == OPENSSL_INETD) {
|
|
s_in = fileno(stdin);
|
|
s_out = fileno(stdout);
|
|
} else {
|
|
s_in = s_out = sock;
|
|
}
|
|
|
|
if (! ssl_init(s_in, s_out, skip_vnc_tls, last_https)) {
|
|
close(vncsock);
|
|
rfbLog("SSL: ssl_helper[%d]: exit case 2 (ssl_init failed)\n", getpid());
|
|
exit(1);
|
|
}
|
|
|
|
if (vencrypt_selected != 0) {
|
|
char *tbuf;
|
|
tbuf = (char *) malloc(strlen(cookie) + 100);
|
|
sprintf(tbuf, "%s,VENCRYPT=%d,%s", uniq, vencrypt_selected, cookie);
|
|
write(vncsock, tbuf, strlen(cookie));
|
|
goto wrote_cookie;
|
|
} else if (anontls_selected != 0) {
|
|
char *tbuf;
|
|
tbuf = (char *) malloc(strlen(cookie) + 100);
|
|
sprintf(tbuf, "%s,ANONTLS=%d,%s", uniq, anontls_selected, cookie);
|
|
write(vncsock, tbuf, strlen(cookie));
|
|
goto wrote_cookie;
|
|
}
|
|
|
|
/*
|
|
* things get messy below since we are trying to do
|
|
* *both* VNC and Java applet httpd through the same
|
|
* SSL socket.
|
|
*/
|
|
|
|
if (! screen) {
|
|
close(vncsock);
|
|
exit(1);
|
|
}
|
|
if (screen->httpListenSock >= 0 && screen->httpPort > 0) {
|
|
have_httpd = 1;
|
|
} else if (ipv6_http_fd >= 0) {
|
|
have_httpd = 1;
|
|
} else if (screen->httpListenSock == -2) {
|
|
have_httpd = 1;
|
|
}
|
|
if (mode == OPENSSL_HTTPS && ! have_httpd) {
|
|
rfbLog("SSL: accept_openssl[%d]: no httpd socket for "
|
|
"-https mode\n", getpid());
|
|
close(vncsock);
|
|
rfbLog("SSL: ssl_helper[%d]: exit case 3 (no httpd sock)\n", getpid());
|
|
exit(1);
|
|
}
|
|
|
|
if (have_httpd) {
|
|
int n = 0, is_http = 0;
|
|
int hport = screen->httpPort;
|
|
char *iface = NULL;
|
|
char *buf, *tbuf;
|
|
|
|
buf = (char *) calloc((ABSIZE+1), 1);
|
|
tbuf = (char *) calloc((2*ABSIZE+1), 1);
|
|
|
|
if (mode == OPENSSL_HTTPS) {
|
|
/*
|
|
* for this mode we know it is HTTP traffic
|
|
* so we skip trying to guess.
|
|
*/
|
|
is_http = 1;
|
|
n = 0;
|
|
goto connect_to_httpd;
|
|
}
|
|
|
|
/*
|
|
* Check if there is stuff to read from remote end
|
|
* if so it is likely a GET or HEAD.
|
|
*/
|
|
if (! is_ssl_readable(s_in, last_https, last_get,
|
|
mode)) {
|
|
goto write_cookie;
|
|
}
|
|
|
|
/*
|
|
* read first 2 bytes to try to guess. sadly,
|
|
* the user is often pondering a "non-verified
|
|
* cert" dialog for a long time before the GET
|
|
* is ever sent. So often we timeout here.
|
|
*/
|
|
|
|
if (db) fprintf(stderr, "watch_for_http_traffic\n");
|
|
|
|
is_http = watch_for_http_traffic(buf, &n, s_in);
|
|
|
|
if (is_http < 0 || is_http == 0) {
|
|
/*
|
|
* error or http not detected, fall back
|
|
* to normal VNC socket.
|
|
*/
|
|
if (db) fprintf(stderr, "is_http err: %d n: %d\n", is_http, n);
|
|
write(vncsock, cookie, strlen(cookie));
|
|
if (n > 0) {
|
|
write(vncsock, buf, n);
|
|
}
|
|
goto wrote_cookie;
|
|
}
|
|
|
|
if (db) fprintf(stderr, "is_http: %d n: %d\n",
|
|
is_http, n);
|
|
if (db) fprintf(stderr, "buf: '%s'\n", buf);
|
|
|
|
if (strstr(buf, "/request.https.vnc.connection")) {
|
|
char reply[] = "HTTP/1.0 200 OK\r\n"
|
|
"Content-Type: octet-stream\r\n"
|
|
"Connection: Keep-Alive\r\n"
|
|
"VNC-Server: x11vnc\r\n"
|
|
"Pragma: no-cache\r\n\r\n";
|
|
/*
|
|
* special case proxy coming thru https
|
|
* instead of a direct SSL connection.
|
|
*/
|
|
rfbLog("Handling VNC request via https GET. [%d]\n", getpid());
|
|
rfbLog("-- %s\n", buf);
|
|
|
|
if (strstr(buf, "/reverse.proxy")) {
|
|
char *buf2;
|
|
int n, ptr;
|
|
#if !LIBVNCSERVER_HAVE_LIBSSL
|
|
write(s_out, reply, strlen(reply));
|
|
#else
|
|
SSL_write(ssl, reply, strlen(reply));
|
|
#endif
|
|
|
|
buf2 = (char *) calloc((8192+1), 1);
|
|
n = 0;
|
|
ptr = 0;
|
|
while (ptr < 8192) {
|
|
#if !LIBVNCSERVER_HAVE_LIBSSL
|
|
n = read(s_in, buf2 + ptr, 1);
|
|
#else
|
|
n = SSL_read(ssl, buf2 + ptr, 1);
|
|
#endif
|
|
if (n > 0) {
|
|
ptr += n;
|
|
}
|
|
if (db) fprintf(stderr, "buf2: '%s'\n", buf2);
|
|
|
|
if (strstr(buf2, "\r\n\r\n")) {
|
|
break;
|
|
}
|
|
}
|
|
free(buf2);
|
|
}
|
|
goto write_cookie;
|
|
|
|
} else if (strstr(buf, "/check.https.proxy.connection")) {
|
|
char reply[] = "HTTP/1.0 200 OK\r\n"
|
|
"Connection: close\r\n"
|
|
"Content-Type: octet-stream\r\n"
|
|
"VNC-Server: x11vnc\r\n"
|
|
"Pragma: no-cache\r\n\r\n";
|
|
|
|
rfbLog("Handling Check HTTPS request via https GET. [%d]\n", getpid());
|
|
rfbLog("-- %s\n", buf);
|
|
|
|
#if !LIBVNCSERVER_HAVE_LIBSSL
|
|
write(s_out, reply, strlen(reply));
|
|
#else
|
|
SSL_write(ssl, reply, strlen(reply));
|
|
SSL_shutdown(ssl);
|
|
#endif
|
|
|
|
strcpy(tbuf, uniq);
|
|
strcat(tbuf, cookie);
|
|
write(vncsock, tbuf, strlen(tbuf));
|
|
close(vncsock);
|
|
|
|
rfbLog("SSL: ssl_helper[%d]: exit case 4 (check.https.proxy.connection)\n", getpid());
|
|
exit(0);
|
|
}
|
|
connect_to_httpd:
|
|
|
|
/*
|
|
* Here we go... no turning back. we have to
|
|
* send failure to parent and close socket to have
|
|
* http processed at all in a timely fashion...
|
|
*/
|
|
|
|
/* send the failure tag: */
|
|
strcpy(tbuf, uniq);
|
|
|
|
if (https_port_redir < 0 || (strstr(buf, "PORT=") || strstr(buf, "port="))) {
|
|
char *q = strstr(buf, "Host:");
|
|
int fport = 443, match = 0;
|
|
char num[16];
|
|
|
|
if (q && strstr(q, "\n")) {
|
|
q += strlen("Host:") + 1;
|
|
while (*q != '\n') {
|
|
int p;
|
|
if (*q == ':' && sscanf(q, ":%d", &p) == 1) {
|
|
if (p > 0 && p < 65536) {
|
|
fport = p;
|
|
match = 1;
|
|
break;
|
|
}
|
|
}
|
|
q++;
|
|
}
|
|
}
|
|
if (!match || !https_port_redir) {
|
|
int p;
|
|
if (sscanf(buf, "PORT=%d,", &p) == 1) {
|
|
if (p > 0 && p < 65536) {
|
|
fport = p;
|
|
}
|
|
} else if (sscanf(buf, "port=%d,", &p) == 1) {
|
|
if (p > 0 && p < 65536) {
|
|
fport = p;
|
|
}
|
|
}
|
|
}
|
|
sprintf(num, "HP=%d,", fport);
|
|
strcat(tbuf, num);
|
|
}
|
|
|
|
if (strstr(buf, "HTTP/") != NULL) {
|
|
char *q, *str;
|
|
/*
|
|
* Also send back the GET line for heuristics.
|
|
* (last_https, get file).
|
|
*/
|
|
str = strdup(buf);
|
|
q = strstr(str, "HTTP/");
|
|
if (q != NULL) {
|
|
*q = '\0';
|
|
strcat(tbuf, str);
|
|
}
|
|
free(str);
|
|
}
|
|
|
|
/*
|
|
* Also send the cookie to pad out the number of
|
|
* bytes to more than the parent wants to read.
|
|
* Since this is the failure case, it does not
|
|
* matter that we send more than strlen(cookie).
|
|
*/
|
|
strcat(tbuf, cookie);
|
|
write(vncsock, tbuf, strlen(tbuf));
|
|
|
|
usleep(150*1000);
|
|
if (db) fprintf(stderr, "close vncsock: %d\n", vncsock);
|
|
close(vncsock);
|
|
|
|
/* now, finally, connect to the libvncserver httpd: */
|
|
if (screen->listenInterface == htonl(INADDR_ANY) ||
|
|
screen->listenInterface == htonl(INADDR_NONE)) {
|
|
iface = "127.0.0.1";
|
|
} else {
|
|
struct in_addr in;
|
|
in.s_addr = screen->listenInterface;
|
|
iface = inet_ntoa(in);
|
|
}
|
|
if (iface == NULL || !strcmp(iface, "")) {
|
|
iface = "127.0.0.1";
|
|
}
|
|
if (db) fprintf(stderr, "iface: %s:%d\n", iface, hport);
|
|
usleep(150*1000);
|
|
|
|
httpsock = connect_tcp(iface, hport);
|
|
|
|
if (httpsock < 0) {
|
|
/* UGH, after all of that! */
|
|
rfbLog("Could not connect to httpd socket!\n");
|
|
rfbLog("SSL: ssl_helper[%d]: exit case 5.\n", getpid());
|
|
exit(1);
|
|
}
|
|
if (db) fprintf(stderr, "ssl_helper[%d]: httpsock: %d %d\n",
|
|
getpid(), httpsock, n);
|
|
|
|
/*
|
|
* send what we read to httpd, and then connect
|
|
* the rest of the SSL session to it:
|
|
*/
|
|
if (n > 0) {
|
|
char *s = getenv("X11VNC_EXTRA_HTTPS_PARAMS");
|
|
int did_extra = 0;
|
|
|
|
if (db) fprintf(stderr, "sending http buffer httpsock: %d n=%d\n'%s'\n", httpsock, n, buf);
|
|
if (s != NULL) {
|
|
char *q = strstr(buf, " HTTP/");
|
|
if (q) {
|
|
int m;
|
|
*q = '\0';
|
|
m = strlen(buf);
|
|
write(httpsock, buf, m);
|
|
write(httpsock, s, strlen(s));
|
|
*q = ' ';
|
|
write(httpsock, q, n-m);
|
|
did_extra = 1;
|
|
}
|
|
}
|
|
if (!did_extra) {
|
|
write(httpsock, buf, n);
|
|
}
|
|
}
|
|
ssl_xfer(httpsock, s_in, s_out, is_http);
|
|
rfbLog("SSL: ssl_helper[%d]: exit case 6 (https ssl_xfer done)\n", getpid());
|
|
exit(0);
|
|
}
|
|
|
|
/*
|
|
* ok, back from the above https mess, simply send the
|
|
* cookie back to the parent (who will attach us to
|
|
* libvncserver), and connect the rest of the SSL session
|
|
* to it.
|
|
*/
|
|
write_cookie:
|
|
write(vncsock, cookie, strlen(cookie));
|
|
|
|
wrote_cookie:
|
|
ssl_xfer(vncsock, s_in, s_out, 0);
|
|
rfbLog("SSL: ssl_helper[%d]: exit case 7 (ssl_xfer done)\n", getpid());
|
|
if (0) usleep(50 * 1000);
|
|
exit(0);
|
|
}
|
|
/* parent here */
|
|
|
|
if (mode != OPENSSL_INETD) {
|
|
close(sock);
|
|
}
|
|
if (db) fprintf(stderr, "helper process is: %d\n", pid);
|
|
|
|
/* accept connection from our child. */
|
|
signal(SIGALRM, csock_timeout);
|
|
csock_timeout_sock = csock;
|
|
alarm(20);
|
|
|
|
vsock = accept(csock, (struct sockaddr *)&addr, &addrlen);
|
|
|
|
alarm(0);
|
|
signal(SIGALRM, SIG_DFL);
|
|
close(csock);
|
|
|
|
|
|
if (vsock < 0) {
|
|
rfbLog("SSL: accept_openssl: connection from ssl_helper[%d] FAILED.\n", pid);
|
|
rfbLogPerror("accept");
|
|
|
|
kill(pid, SIGTERM);
|
|
waitpid(pid, &status, WNOHANG);
|
|
if (mode == OPENSSL_INETD || ssl_no_fail) {
|
|
clean_up_exit(1);
|
|
}
|
|
if (certret_fd >= 0) {
|
|
close(certret_fd);
|
|
certret_fd = -1;
|
|
}
|
|
if (certret) {
|
|
unlink(certret);
|
|
}
|
|
if (dhret_fd >= 0) {
|
|
close(dhret_fd);
|
|
dhret_fd = -1;
|
|
}
|
|
if (dhret) {
|
|
unlink(dhret);
|
|
}
|
|
return;
|
|
}
|
|
if (db) fprintf(stderr, "accept_openssl: vsock: %d\n", vsock);
|
|
|
|
n = read(vsock, rcookie, strlen(cookie));
|
|
if (n < 0 && errno != 0) {
|
|
rfbLogPerror("read");
|
|
}
|
|
|
|
if (certret) {
|
|
struct stat sbuf;
|
|
sbuf.st_size = 0;
|
|
if (certret_fd >= 0 && stat(certret, &sbuf) == 0 && sbuf.st_size > 0) {
|
|
certret_str = (char *) calloc(sbuf.st_size+1, 1);
|
|
read(certret_fd, certret_str, sbuf.st_size);
|
|
close(certret_fd);
|
|
certret_fd = -1;
|
|
}
|
|
if (certret_fd >= 0) {
|
|
close(certret_fd);
|
|
certret_fd = -1;
|
|
}
|
|
unlink(certret);
|
|
if (certret_str && strstr(certret_str, "NOCERT") == certret_str) {
|
|
free(certret_str);
|
|
certret_str = NULL;
|
|
}
|
|
if (0 && certret_str) {
|
|
fprintf(stderr, "certret_str[%d]:\n%s\n", (int) sbuf.st_size, certret_str);
|
|
}
|
|
}
|
|
|
|
if (dhret) {
|
|
struct stat sbuf;
|
|
sbuf.st_size = 0;
|
|
if (dhret_fd >= 0 && stat(dhret, &sbuf) == 0 && sbuf.st_size > 0) {
|
|
dhret_str = (char *) calloc(sbuf.st_size+1, 1);
|
|
read(dhret_fd, dhret_str, sbuf.st_size);
|
|
close(dhret_fd);
|
|
dhret_fd = -1;
|
|
}
|
|
if (dhret_fd >= 0) {
|
|
close(dhret_fd);
|
|
dhret_fd = -1;
|
|
}
|
|
unlink(dhret);
|
|
if (dhret_str && strstr(dhret_str, "NOCERT") == dhret_str) {
|
|
free(dhret_str);
|
|
dhret_str = NULL;
|
|
}
|
|
if (dhret_str) {
|
|
if (new_dh_params == NULL) {
|
|
fprintf(stderr, "dhret_str[%d]:\n%s\n", (int) sbuf.st_size, dhret_str);
|
|
new_dh_params = strdup(dhret_str);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (0) {
|
|
fprintf(stderr, "rcookie: %s\n", rcookie);
|
|
fprintf(stderr, "cookie: %s\n", cookie);
|
|
}
|
|
|
|
if (strstr(rcookie, uniq) == rcookie) {
|
|
char *q = strstr(rcookie, "RB=");
|
|
if (q && strstr(cookie, q) == cookie) {
|
|
vencrypt_sel = 0;
|
|
anontls_sel = 0;
|
|
q = strstr(rcookie, "VENCRYPT=");
|
|
if (q && sscanf(q, "VENCRYPT=%d,", &vencrypt_sel) == 1) {
|
|
if (vencrypt_sel != 0) {
|
|
rfbLog("SSL: VENCRYPT mode=%d accepted. helper[%d]\n", vencrypt_sel, pid);
|
|
goto accept_client;
|
|
}
|
|
}
|
|
q = strstr(rcookie, "ANONTLS=");
|
|
if (q && sscanf(q, "ANONTLS=%d,", &anontls_sel) == 1) {
|
|
if (anontls_sel != 0) {
|
|
rfbLog("SSL: ANONTLS mode=%d accepted. helper[%d]\n", anontls_sel, pid);
|
|
goto accept_client;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (n != (int) strlen(cookie) || strncmp(cookie, rcookie, n)) {
|
|
rfbLog("SSL: accept_openssl: cookie from ssl_helper[%d] FAILED. %d\n", pid, n);
|
|
if (db) fprintf(stderr, "'%s'\n'%s'\n", cookie, rcookie);
|
|
close(vsock);
|
|
|
|
if (strstr(rcookie, uniq) == rcookie) {
|
|
int i;
|
|
double https_download_wait_time = 15.0;
|
|
|
|
if (getenv("X11VNC_HTTPS_DOWNLOAD_WAIT_TIME")) {
|
|
https_download_wait_time = atof(getenv("X11VNC_HTTPS_DOWNLOAD_WAIT_TIME"));
|
|
}
|
|
|
|
rfbLog("SSL: BUT WAIT! HTTPS for helper process[%d] succeeded. Good.\n", pid);
|
|
if (mode != OPENSSL_HTTPS) {
|
|
last_https = dnow();
|
|
for (i=0; i<256; i++) {
|
|
last_get[i] = '\0';
|
|
}
|
|
strncpy(last_get, rcookie, 100);
|
|
if (db) fprintf(stderr, "last_get: '%s'\n", last_get);
|
|
}
|
|
if (rcookie && strstr(rcookie, "VncViewer.class")) {
|
|
rfbLog("\n");
|
|
rfbLog("helper[%d]:\n", pid);
|
|
rfbLog("***********************************************************\n");
|
|
rfbLog("SSL: WARNING CLIENT ASKED FOR NONEXISTENT 'VncViewer.class'\n");
|
|
rfbLog("SSL: USER NEEDS TO MAKE SURE THE JAVA PLUGIN IS INSTALLED\n");
|
|
rfbLog("SSL: AND WORKING PROPERLY (e.g. a test-java-plugin page.)\n");
|
|
rfbLog("SSL: AND/OR USER NEEDS TO **RESTART** HIS WEB BROWSER.\n");
|
|
rfbLog("SSL: SOMETIMES THE BROWSER 'REMEMBERS' FAILED APPLET DOWN-\n");
|
|
rfbLog("SSL: LOADS AND RESTARTING IT IS THE ONLY WAY TO FIX THINGS.\n");
|
|
rfbLog("***********************************************************\n");
|
|
rfbLog("\n");
|
|
}
|
|
ssl_helper_pid(pid, -2);
|
|
|
|
if (https_port_redir) {
|
|
double start;
|
|
int origport = screen->port;
|
|
int useport = screen->port;
|
|
int saw_httpsock = 0;
|
|
/* to expand $PORT correctly in index.vnc */
|
|
if (https_port_redir < 0) {
|
|
char *q = strstr(rcookie, "HP=");
|
|
if (q) {
|
|
int p;
|
|
if (sscanf(q, "HP=%d,", &p) == 1) {
|
|
useport = p;
|
|
}
|
|
}
|
|
} else {
|
|
useport = https_port_redir;
|
|
}
|
|
screen->port = useport;
|
|
if (origport != useport) {
|
|
rfbLog("SSL: -httpsredir guess port: %d helper[%d]\n", screen->port, pid);
|
|
}
|
|
|
|
start = dnow();
|
|
while (dnow() < start + https_download_wait_time) {
|
|
if (screen->httpSock >= 0) saw_httpsock = 1;
|
|
rfbPE(10000);
|
|
usleep(10000);
|
|
if (screen->httpSock >= 0) saw_httpsock = 1;
|
|
waitpid(pid, &status, WNOHANG);
|
|
if (kill(pid, 0) != 0) {
|
|
rfbLog("SSL: helper[%d] pid finished\n", pid);
|
|
break;
|
|
}
|
|
if (0 && saw_httpsock && screen->httpSock < 0) {
|
|
/* this check can kill the helper too soon. */
|
|
rfbLog("SSL: httpSock for helper[%d] went away\n", pid);
|
|
break;
|
|
}
|
|
}
|
|
rfbLog("SSL: guessing child helper[%d] https finished. dt=%.6f\n",
|
|
pid, dnow() - start);
|
|
|
|
rfbPE(10000);
|
|
rfbPE(10000);
|
|
rfbPE(10000);
|
|
|
|
screen->port = origport;
|
|
ssl_helper_pid(0, -2);
|
|
if (mode == OPENSSL_INETD) {
|
|
clean_up_exit(1);
|
|
}
|
|
} else if (mode == OPENSSL_INETD) {
|
|
double start;
|
|
int saw_httpsock = 0;
|
|
|
|
/* to expand $PORT correctly in index.vnc */
|
|
if (screen->port == 0) {
|
|
int fd = fileno(stdin);
|
|
if (getenv("X11VNC_INETD_PORT")) {
|
|
/* mutex */
|
|
screen->port = atoi(getenv(
|
|
"X11VNC_INETD_PORT"));
|
|
} else {
|
|
int tport = get_local_port(fd);
|
|
if (tport > 0) {
|
|
screen->port = tport;
|
|
}
|
|
}
|
|
}
|
|
rfbLog("SSL: screen->port %d for helper[%d]\n", screen->port, pid);
|
|
|
|
/* kludge for https fetch via inetd */
|
|
start = dnow();
|
|
while (dnow() < start + https_download_wait_time) {
|
|
if (screen->httpSock >= 0) saw_httpsock = 1;
|
|
rfbPE(10000);
|
|
usleep(10000);
|
|
if (screen->httpSock >= 0) saw_httpsock = 1;
|
|
waitpid(pid, &status, WNOHANG);
|
|
if (kill(pid, 0) != 0) {
|
|
rfbLog("SSL: helper[%d] pid finished\n", pid);
|
|
break;
|
|
}
|
|
if (0 && saw_httpsock && screen->httpSock < 0) {
|
|
/* this check can kill the helper too soon. */
|
|
rfbLog("SSL: httpSock for helper[%d] went away\n", pid);
|
|
break;
|
|
}
|
|
}
|
|
rfbLog("SSL: OPENSSL_INETD guessing "
|
|
"child helper[%d] https finished. dt=%.6f\n",
|
|
pid, dnow() - start);
|
|
|
|
rfbPE(10000);
|
|
rfbPE(10000);
|
|
rfbPE(10000);
|
|
|
|
ssl_helper_pid(0, -2);
|
|
clean_up_exit(1);
|
|
}
|
|
/* this will actually only get earlier https */
|
|
ssl_helper_pid(0, -2);
|
|
return;
|
|
}
|
|
kill(pid, SIGTERM);
|
|
waitpid(pid, &status, WNOHANG);
|
|
if (mode == OPENSSL_INETD || ssl_no_fail) {
|
|
clean_up_exit(1);
|
|
}
|
|
return;
|
|
}
|
|
|
|
accept_client:
|
|
|
|
if (db) fprintf(stderr, "accept_openssl: cookie good: %s\n", cookie);
|
|
|
|
rfbLog("SSL: handshake with helper process[%d] succeeded.\n", pid);
|
|
|
|
openssl_last_helper_pid = pid;
|
|
ssl_helper_pid(pid, vsock);
|
|
|
|
if (vnc_redirect) {
|
|
vnc_redirect_sock = vsock;
|
|
openssl_last_helper_pid = 0;
|
|
return;
|
|
}
|
|
|
|
client = create_new_client(vsock, 0);
|
|
openssl_last_helper_pid = 0;
|
|
|
|
if (client) {
|
|
int swt = 0;
|
|
if (mode == OPENSSL_VNC6 && openssl_last_ip != NULL) {
|
|
swt = 1;
|
|
} else if (mode == OPENSSL_REVERSE && ipv6_name != NULL && openssl_last_ip != NULL) {
|
|
swt = 1;
|
|
}
|
|
if (swt) {
|
|
if (client->host) {
|
|
free(client->host);
|
|
}
|
|
client->host = strdup(openssl_last_ip);
|
|
}
|
|
if (db) fprintf(stderr, "accept_openssl: client %p\n", (void *) client);
|
|
if (db) fprintf(stderr, "accept_openssl: new_client %p\n", (void *) screen->newClientHook);
|
|
if (db) fprintf(stderr, "accept_openssl: new_client %p\n", (void *) new_client);
|
|
if (mode == OPENSSL_INETD) {
|
|
inetd_client = client;
|
|
client->clientGoneHook = client_gone;
|
|
}
|
|
if (openssl_last_ip &&
|
|
strpbrk(openssl_last_ip, "0123456789") == openssl_last_ip) {
|
|
client->host = strdup(openssl_last_ip);
|
|
}
|
|
if (vencrypt_sel != 0) {
|
|
client->protocolMajorVersion = 3;
|
|
client->protocolMinorVersion = 8;
|
|
#if LIBVNCSERVER_HAVE_LIBSSL
|
|
if (!finish_vencrypt_auth(client, vencrypt_sel)) {
|
|
rfbCloseClient(client);
|
|
client = NULL;
|
|
}
|
|
#else
|
|
badnews("3 accept_openssl");
|
|
#endif
|
|
} else if (anontls_sel != 0) {
|
|
client->protocolMajorVersion = 3;
|
|
client->protocolMinorVersion = 8;
|
|
rfbAuthNewClient(client);
|
|
}
|
|
if (use_threads && client != NULL) {
|
|
rfbStartOnHoldClient(client);
|
|
}
|
|
/* try to get RFB proto done now. */
|
|
progress_client();
|
|
} else {
|
|
rfbLog("SSL: accept_openssl: rfbNewClient failed.\n");
|
|
close(vsock);
|
|
|
|
kill(pid, SIGTERM);
|
|
waitpid(pid, &status, WNOHANG);
|
|
if (mode == OPENSSL_INETD || ssl_no_fail) {
|
|
clean_up_exit(1);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
|
|
void raw_xfer(int csock, int s_in, int s_out) {
|
|
char buf0[8192];
|
|
int sz = 8192, n, m, status, db = 1;
|
|
char *buf;
|
|
#ifdef FORK_OK
|
|
pid_t par = getpid();
|
|
pid_t pid = fork();
|
|
|
|
buf = buf0;
|
|
if (vnc_redirect) {
|
|
/* change buf size some direction. */
|
|
}
|
|
|
|
if (getenv("X11VNC_DEBUG_RAW_XFER")) {
|
|
db = atoi(getenv("X11VNC_DEBUG_RAW_XFER"));
|
|
}
|
|
if (pid < 0) {
|
|
exit(1);
|
|
}
|
|
/* this is for testing or special helper usage, no SSL just socket redir */
|
|
if (pid) {
|
|
if (db) rfbLog("raw_xfer start: %d -> %d/%d\n", csock, s_in, s_out);
|
|
|
|
while (1) {
|
|
n = read(csock, buf, sz);
|
|
if (n == 0 || (n < 0 && errno != EINTR) ) {
|
|
break;
|
|
} else if (n > 0) {
|
|
int len = n;
|
|
char *src = buf;
|
|
if (db > 1) write(2, buf, n);
|
|
while (len > 0) {
|
|
m = write(s_out, src, len);
|
|
if (m > 0) {
|
|
src += m;
|
|
len -= m;
|
|
continue;
|
|
}
|
|
if (m < 0 && (errno == EINTR || errno == EAGAIN)) {
|
|
continue;
|
|
}
|
|
if (db) rfbLog("raw_xfer bad write: %d -> %d | %d/%d errno=%d\n", csock, s_out, m, n, errno);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
usleep(250*1000);
|
|
kill(pid, SIGTERM);
|
|
waitpid(pid, &status, WNOHANG);
|
|
if (db) rfbLog("raw_xfer done: %d -> %d\n", csock, s_out);
|
|
|
|
} else {
|
|
if (db) usleep(50*1000);
|
|
if (db) rfbLog("raw_xfer start: %d <- %d\n", csock, s_in);
|
|
|
|
while (1) {
|
|
n = read(s_in, buf, sz);
|
|
if (n == 0 || (n < 0 && errno != EINTR) ) {
|
|
break;
|
|
} else if (n > 0) {
|
|
int len = n;
|
|
char *src = buf;
|
|
if (db > 1) write(2, buf, n);
|
|
while (len > 0) {
|
|
m = write(csock, src, len);
|
|
if (m > 0) {
|
|
src += m;
|
|
len -= m;
|
|
continue;
|
|
}
|
|
if (m < 0 && (errno == EINTR || errno == EAGAIN)) {
|
|
continue;
|
|
}
|
|
if (db) rfbLog("raw_xfer bad write: %d <- %d | %d/%d errno=%d\n", csock, s_in, m, n, errno);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
usleep(250*1000);
|
|
kill(par, SIGTERM);
|
|
waitpid(par, &status, WNOHANG);
|
|
if (db) rfbLog("raw_xfer done: %d <- %d\n", csock, s_in);
|
|
}
|
|
close(csock);
|
|
close(s_in);
|
|
close(s_out);
|
|
#endif /* FORK_OK */
|
|
}
|
|
|
|
/* compile with -DENC_HAVE_OPENSSL=0 to disable enc stuff but still have ssl */
|
|
|
|
#define ENC_MODULE
|
|
|
|
#if LIBVNCSERVER_HAVE_LIBSSL
|
|
#ifndef ENC_HAVE_OPENSSL
|
|
#define ENC_HAVE_OPENSSL 1
|
|
#endif
|
|
#else
|
|
#define ENC_HAVE_OPENSSL 0
|
|
#endif
|
|
|
|
#define ENC_DISABLE_SHOW_CERT
|
|
|
|
#include "enc.h"
|
|
|
|
static void symmetric_encryption_xfer(int csock, int s_in, int s_out) {
|
|
char tmp[100];
|
|
char *cipher, *keyfile, *q;
|
|
|
|
if (! enc_str) {
|
|
return;
|
|
}
|
|
cipher = (char *) malloc(strlen(enc_str) + 100);
|
|
q = strchr(enc_str, ':');
|
|
if (!q) return;
|
|
*q = '\0';
|
|
if (getenv("X11VNC_USE_ULTRADSM_IV")) {
|
|
sprintf(cipher, "rev:%s", enc_str);
|
|
} else {
|
|
sprintf(cipher, "noultra:rev:%s", enc_str);
|
|
}
|
|
keyfile = strdup(q+1);
|
|
*q = ':';
|
|
|
|
|
|
/* TBD: s_in != s_out */
|
|
if (s_out) {}
|
|
|
|
sprintf(tmp, "fd=%d,%d", s_in, csock);
|
|
|
|
enc_do(cipher, keyfile, "-1", tmp);
|
|
}
|
|
|