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-rw-r--r--x11vnc/sslhelper.c4345
1 files changed, 0 insertions, 4345 deletions
diff --git a/x11vnc/sslhelper.c b/x11vnc/sslhelper.c
deleted file mode 100644
index 7057615..0000000
--- a/x11vnc/sslhelper.c
+++ /dev/null
@@ -1,4345 +0,0 @@
-/*
- Copyright (C) 2002-2010 Karl J. Runge <runge@karlrunge.com>
- All rights reserved.
-
-This file is part of x11vnc.
-
-x11vnc is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or (at
-your option) any later version.
-
-x11vnc is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with x11vnc; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA
-or see <http://www.gnu.org/licenses/>.
-
-In addition, as a special exception, Karl J. Runge
-gives permission to link the code of its release of x11vnc with the
-OpenSSL project's "OpenSSL" library (or with modified versions of it
-that use the same license as the "OpenSSL" library), and distribute
-the linked executables. You must obey the GNU General Public License
-in all respects for all of the code used other than "OpenSSL". If you
-modify this file, you may extend this exception to your version of the
-file, but you are not obligated to do so. If you do not wish to do
-so, delete this exception statement from your version.
-*/
-
-/* -- sslhelper.c -- */
-
-#include "x11vnc.h"
-#include "inet.h"
-#include "cleanup.h"
-#include "screen.h"
-#include "scan.h"
-#include "connections.h"
-#include "sslcmds.h"
-#include "unixpw.h"
-#include "user.h"
-
-#define OPENSSL_INETD 1
-#define OPENSSL_VNC 2
-#define OPENSSL_VNC6 3
-#define OPENSSL_HTTPS 4
-#define OPENSSL_HTTPS6 5
-#define OPENSSL_REVERSE 6
-
-#define DO_DH 0
-
-#if LIBVNCSERVER_HAVE_FORK
-#if LIBVNCSERVER_HAVE_SYS_WAIT_H && LIBVNCSERVER_HAVE_WAITPID
-#define FORK_OK
-#endif
-#endif
-
-int openssl_sock = -1;
-int openssl_sock6 = -1;
-int openssl_port_num = 0;
-int https_sock = -1;
-int https_sock6 = -1;
-pid_t openssl_last_helper_pid = 0;
-char *openssl_last_ip = NULL;
-
-static char *certret = NULL;
-static int certret_fd = -1;
-static mode_t omode;
-char *certret_str = NULL;
-
-static char *dhret = NULL;
-static int dhret_fd = -1;
-char *dhret_str = NULL;
-char *new_dh_params = NULL;
-
-void raw_xfer(int csock, int s_in, int s_out);
-
-/* openssl(1) pem related functions: */
-char *get_saved_pem(char *string, int create);
-char *find_openssl_bin(void);
-char *get_ssl_verify_file(char *str_in);
-char *create_tmp_pem(char *path, int prompt);
-
-static char *get_input(char *tag, char **in);
-
-char *get_saved_pem(char *save, int create) {
- char *s = NULL, *path, *cdir, *tmp;
- int prompt = 0, len;
- struct stat sbuf;
-
- if (! save) {
- rfbLog("get_saved_pem: save string is null.\n");
- clean_up_exit(1);
- }
-
- if (strstr(save, "SAVE_PROMPT") == save) {
- prompt = 1;
- s = save + strlen("SAVE_PROMPT");
- } else if (strstr(save, "SAVE_NOPROMPT") == save) {
- set_env("GENCERT_NOPROMPT", "1");
- s = save + strlen("SAVE_NOPROMPT");
- } else if (strstr(save, "SAVE") == save) {
- s = save + strlen("SAVE");
- } else {
- rfbLog("get_saved_pem: invalid save string: %s\n", save);
- clean_up_exit(1);
- }
- if (strchr(s, '/')) {
- rfbLog("get_saved_pem: invalid save string: %s\n", s);
- clean_up_exit(1);
- }
-
-
- cdir = get_Cert_dir(NULL, &tmp);
- if (! cdir || ! tmp) {
- rfbLog("get_saved_pem: could not find Cert dir.\n");
- clean_up_exit(1);
- }
-
- len = strlen(cdir) + strlen("/server.pem") + strlen(s) + 1;
-
- path = (char *) malloc(len);
- sprintf(path, "%s/server%s.pem", cdir, s);
-
- if (stat(path, &sbuf) != 0) {
- char *new_name = NULL;
- if (create) {
- if (inetd || opts_bg) {
- set_env("GENCERT_NOPROMPT", "1");
- }
- new_name = create_tmp_pem(path, prompt);
- if (!getenv("X11VNC_SSL_NO_PASSPHRASE") && !inetd && !opts_bg) {
- sslEncKey(new_name, 0);
- }
- }
- return new_name;
- }
-
- if (! quiet) {
- char line[1024];
- int on = 0;
- FILE *in = fopen(path, "r");
- if (in != NULL) {
- rfbLog("\n");
- rfbLog("Using SSL Certificate:\n");
- fprintf(stderr, "\n");
- while (fgets(line, 1024, in) != NULL) {
- if (strstr(line, "BEGIN CERTIFICATE")) {
- on = 1;
- }
- if (on) {
- fprintf(stderr, "%s", line);
- }
- if (strstr(line, "END CERTIFICATE")) {
- on = 0;
- }
- if (strstr(line, "PRIVATE KEY")) {
- on = 0;
- }
- }
- fprintf(stderr, "\n");
- fclose(in);
- }
- }
- return strdup(path);
-}
-
-static char *get_input(char *tag, char **in) {
- char line[1024], *str;
-
- if (! tag || ! in || ! *in) {
- return NULL;
- }
-
- fprintf(stderr, "%s:\n [%s] ", tag, *in);
- if (fgets(line, 1024, stdin) == NULL) {
- rfbLog("could not read stdin!\n");
- rfbLogPerror("fgets");
- clean_up_exit(1);
- }
- if ((str = strrchr(line, '\n')) != NULL) {
- *str = '\0';
- }
- str = lblanks(line);
- if (!strcmp(str, "")) {
- return *in;
- } else {
- return strdup(line);
- }
-}
-
-char *find_openssl_bin(void) {
- char *path, *exe, *p, *gp;
- struct stat sbuf;
- int found_openssl = 0;
- char extra[] = ":/usr/bin:/bin:/usr/sbin:/usr/local/bin"
- ":/usr/local/sbin:/usr/sfw/bin";
-
- gp = getenv("PATH");
- if (! gp) {
- fprintf(stderr, "could not find openssl(1) program in PATH. (null)\n");
- return NULL;
- }
-
- path = (char *) malloc(strlen(gp) + strlen(extra) + 1);
- strcpy(path, gp);
- strcat(path, extra);
-
- /* find openssl binary: */
- exe = (char *) malloc(strlen(path) + strlen("/openssl") + 1);
- p = strtok(path, ":");
-
- while (p) {
- sprintf(exe, "%s/openssl", p);
- if (stat(exe, &sbuf) == 0) {
- if (! S_ISDIR(sbuf.st_mode)) {
- found_openssl = 1;
- break;
- }
- }
- p = strtok(NULL, ":");
- }
- free(path);
-
- if (! found_openssl) {
- fprintf(stderr, "could not find openssl(1) program in PATH.\n");
- fprintf(stderr, "PATH=%s\n", gp);
- fprintf(stderr, "(also checked: %s)\n", extra);
- return NULL;
- }
- return exe;
-}
-
-/* uses /usr/bin/openssl to create a tmp cert */
-
-char *create_tmp_pem(char *pathin, int prompt) {
- pid_t pid, pidw;
- FILE *in, *out;
- char cnf[] = "/tmp/x11vnc-cnf.XXXXXX";
- char pem[] = "/tmp/x11vnc-pem.XXXXXX";
- char str[8*1024], line[1024], *exe;
- int cnf_fd, pem_fd, status, show_cert = 1;
- char *days;
- char *C, *L, *OU, *O, *CN, *EM;
- char tmpl[] =
-"[ req ]\n"
-"prompt = no\n"
-"default_bits = 2048\n"
-"encrypt_key = yes\n"
-"distinguished_name = req_dn\n"
-"x509_extensions = cert_type\n"
-"\n"
-"[ req_dn ]\n"
-"countryName=%s\n"
-"localityName=%s\n"
-"organizationalUnitName=%s\n"
-"organizationName=%s\n"
-"commonName=%s\n"
-"emailAddress=%s\n"
-"\n"
-"[ cert_type ]\n"
-"nsCertType = server\n"
-;
-
- C = strdup("AU");
- L = strdup(UT.sysname ? UT.sysname : "unknown-os");
- snprintf(line, 1024, "%s-%f", UT.nodename ? UT.nodename :
- "unknown-node", dnow());
- line[1024-1] = '\0';
-
- OU = strdup(line);
- O = strdup("x11vnc");
- if (pathin) {
- snprintf(line, 1024, "x11vnc-SELF-SIGNED-CERT-%d", getpid());
- } else {
- snprintf(line, 1024, "x11vnc-SELF-SIGNED-TEMPORARY-CERT-%d",
- getpid());
- }
- line[1024-1] = '\0';
- CN = strdup(line);
- EM = strdup("x11vnc@server.nowhere");
-
- /* ssl */
- if (no_external_cmds || !cmd_ok("ssl")) {
- rfbLog("create_tmp_pem: cannot run external commands.\n");
- return NULL;
- }
-
- rfbLog("\n");
- if (pathin) {
- rfbLog("Creating a self-signed PEM certificate...\n");
- } else {
- rfbLog("Creating a temporary, self-signed PEM certificate...\n");
- }
-
- rfbLog("\n");
- rfbLog("This will NOT prevent Man-In-The-Middle attacks UNLESS you\n");
- rfbLog("get the certificate information to the VNC viewers SSL\n");
- rfbLog("tunnel configuration or you take the extra steps to sign it\n");
- rfbLog("with a CA key. However, it will prevent passive network\n");
- rfbLog("sniffing.\n");
- rfbLog("\n");
- rfbLog("The cert inside -----BEGIN CERTIFICATE-----\n");
- rfbLog(" ....\n");
- rfbLog(" -----END CERTIFICATE-----\n");
- rfbLog("printed below may be used on the VNC viewer-side to\n");
- rfbLog("authenticate this server for this session. See the -ssl\n");
- rfbLog("help output and the FAQ for how to create a permanent\n");
- rfbLog("server certificate.\n");
- rfbLog("\n");
-
- exe = find_openssl_bin();
- if (! exe) {
- return NULL;
- }
-
- /* create template file with our made up stuff: */
- if (prompt) {
- fprintf(stderr, "\nReply to the following prompts to set"
- " your Certificate parameters.\n");
- fprintf(stderr, "(press Enter to accept the default in [...], "
- "or type in the value you want)\n\n");
- C = get_input("CountryName", &C);
- L = get_input("LocalityName", &L);
- OU = get_input("OrganizationalUnitName", &OU);
- O = get_input("OrganizationalName", &O);
- CN = get_input("CommonName", &CN);
- EM = get_input("EmailAddress", &EM);
- }
- sprintf(str, tmpl, C, L, OU, O, CN, EM);
-
- cnf_fd = mkstemp(cnf);
- if (cnf_fd < 0) {
- return NULL;
- }
- pem_fd = mkstemp(pem);
- if (pem_fd < 0) {
- close(cnf_fd);
- return NULL;
- }
-
- close(pem_fd);
-
- write(cnf_fd, str, strlen(str));
- close(cnf_fd);
-
- if (pathin) {
- days = "365";
- } else {
- days = "30";
- }
-
-#ifndef FORK_OK
- rfbLog("not compiled with fork(2)\n");
- clean_up_exit(1);
-#else
- /* make RSA key */
- pid = fork();
- if (pid < 0) {
- return NULL;
- } else if (pid == 0) {
- int i;
- for (i=0; i<256; i++) {
- close(i);
- }
- execlp(exe, exe, "req", "-new", "-x509", "-nodes",
- "-days", days, "-config", cnf, "-out", pem,
- "-keyout", pem, (char *)0);
- exit(1);
- }
- pidw = waitpid(pid, &status, 0);
- if (pidw != pid) {
- return NULL;
- }
- if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
- ;
- } else {
- return NULL;
- }
-
-#if DO_DH
- /* make DH parameters */
- pid = fork();
- if (pid < 0) {
- return NULL;
- } else if (pid == 0) {
- int i;
- for (i=0; i<256; i++) {
- close(i);
- }
- /* rather slow at 1024 */
- execlp(exe, exe, "dhparam", "-out", cnf, "512", (char *)0);
- exit(1);
- }
- pidw = waitpid(pid, &status, 0);
- if (pidw != pid) {
- return NULL;
- }
- if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
- ;
- } else {
- return NULL;
- }
-
- /* append result: */
- in = fopen(cnf, "r");
- if (in == NULL) {
- return NULL;
- }
- out = fopen(pem, "a");
- if (out == NULL) {
- fclose(in);
- return NULL;
- }
- while (fgets(line, 1024, in) != NULL) {
- fprintf(out, "%s", line);
- }
- fclose(in);
- fclose(out);
-#endif
-
-#endif /* FORK_OK */
-
- unlink(cnf);
- free(exe);
-
- if (pathin != NULL) {
- char *q, *pathcrt = strdup(pathin);
- FILE *crt = NULL;
- int on = 0;
-
- q = strrchr(pathcrt, '/');
- if (q) {
- q = strstr(q, ".pem");
- if (q) {
- *(q+1) = 'c';
- *(q+2) = 'r';
- *(q+3) = 't';
- crt = fopen(pathcrt, "w");
- }
- }
- 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);
- unlink(pathcrt);
- return NULL;
- }
- while (fgets(line, 1024, in) != NULL) {
- if (strstr(line, "BEGIN CERTIFICATE")) {
- on = 1;
- }
- fprintf(out, "%s", line);
- if (on) {
- fprintf(crt, "%s", line);
- if (!quiet) {
- fprintf(stderr, "%s", line);
- }
- }
- if (strstr(line, "END CERTIFICATE")) {
- on = 0;
- }
- if (strstr(line, "PRIVATE KEY")) {
- 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);
-}
-
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