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1115 lines
24 KiB
1115 lines
24 KiB
/* -- sslhelper.c -- */
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#include "x11vnc.h"
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#include "inet.h"
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#include "cleanup.h"
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#include "screen.h"
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#include "scan.h"
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#if LIBVNCSERVER_HAVE_FORK
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#if LIBVNCSERVER_HAVE_SYS_WAIT_H && LIBVNCSERVER_HAVE_WAITPID
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#define FORK_OK
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#endif
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#endif
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int openssl_sock = -1;
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pid_t openssl_last_helper_pid = 0;
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#if !LIBVNCSERVER_HAVE_LIBSSL
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int openssl_present(void) {return 0;}
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void openssl_init(void) {
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rfbLog("not compiled with libssl support.\n");
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clean_up_exit(1);
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}
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void openssl_port(void) {}
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void check_openssl(void) {}
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void ssh_helper_pid(pid_t pid, int sock) {sock = pid;}
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#else
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#include <openssl/ssl.h>
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#include <openssl/err.h>
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#include <openssl/rand.h>
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int openssl_present(void);
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void openssl_init(void);
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void openssl_port(void);
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void check_openssl(void);
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void ssh_helper_pid(pid_t pid, int sock);
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static SSL_CTX *ctx = NULL;
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static RSA *rsa_512 = NULL;
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static RSA *rsa_1024 = NULL;
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static SSL *ssl = NULL;
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static void init_prng(void);
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static void sslerrexit(void);
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static char *create_tmp_pem(void);
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static int ssl_init(int csock, int ssock);
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static void ssl_xfer(int csock, int ssock);
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#ifndef FORK_OK
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void openssl_init(void) {
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rfbLog("openssl_init: fork is not supported. cannot create"
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" ssl helper process.\n");
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clean_up_exit(1);
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}
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int openssl_present(void) {return 0;}
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#else
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int openssl_present(void) {return 1;}
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static void sslerrexit(void) {
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unsigned long err = ERR_get_error();
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char str[256];
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if (err) {
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ERR_error_string(err, str);
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fprintf(stderr, "ssl error: %s\n", str);
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}
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clean_up_exit(1);
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}
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static char *create_tmp_pem(void) {
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pid_t pid, pidw;
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FILE *in, *out;
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char cnf[] = "/tmp/x11vnc-cnf.XXXXXX";
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char pem[] = "/tmp/x11vnc-pem.XXXXXX";
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char str[4096], line[1024], *path, *p, *exe;
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int found_openssl = 0, cnf_fd, pem_fd, status, db = 1;
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struct stat sbuf;
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char tmpl[] =
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"[ req ]\n"
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"prompt = no\n"
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"default_bits = 1024\n"
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"encrypt_key = yes\n"
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"distinguished_name = req_dn\n"
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"x509_extensions = cert_type\n"
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"\n"
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"[ req_dn ]\n"
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"countryName=AU\n"
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"localityName=%s\n"
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"organizationalUnitName=%s-%f\n"
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"commonName=x11vnc-%d\n"
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"emailAddress=nobody@x11vnc.server\n"
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"\n"
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"[ cert_type ]\n"
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"nsCertType = server\n"
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;
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if (no_external_cmds) {
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rfbLog("create_tmp_pem: cannot run external commands.\n");
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return NULL;
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}
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rfbLog("\n");
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rfbLog("Creating a temporary, self-signed PEM certificate...\n");
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rfbLog("This will NOT prevent man-in-the-middle attacks unless you\n");
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rfbLog("get the certificate information to the VNC viewers ssl\n");
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rfbLog("tunnel configuration. But it will prevent passive sniffing.\n");
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if (! getenv("PATH")) {
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return NULL;
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}
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path = strdup(getenv("PATH"));
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/* find openssl binary: */
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exe = (char *) malloc(strlen(path) + strlen("/openssl") + 1);
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p = strtok(path, ":");
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while (p) {
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sprintf(exe, "%s/openssl", p);
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if (stat(exe, &sbuf) == 0) {
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if (! S_ISDIR(sbuf.st_mode)) {
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found_openssl = 1;
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break;
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}
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}
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p = strtok(NULL, ":");
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}
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free(path);
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if (! found_openssl) {
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return NULL;
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}
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cnf_fd = mkstemp(cnf);
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pem_fd = mkstemp(pem);
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if (cnf_fd < 0 || pem_fd < 0) {
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return NULL;
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}
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close(pem_fd);
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/* create template file with our made up stuff: */
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sprintf(str, tmpl, UT.sysname, UT.nodename, dnow(), (int) getpid());
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write(cnf_fd, str, strlen(str));
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close(cnf_fd);
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/* make RSA key */
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pid = fork();
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if (pid < 0) {
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return NULL;
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} else if (pid == 0) {
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int i;
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for (i=0; i<256; i++) {
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close(i);
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}
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execlp(exe, exe, "req", "-new", "-x509", "-nodes",
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"-config", cnf, "-out", pem, "-keyout", pem, (char *)0);
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exit(1);
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}
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pidw = waitpid(pid, &status, 0);
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if (pidw != pid) {
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return NULL;
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}
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if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
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;
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} else {
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return NULL;
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}
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/* make DH parameters */
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pid = fork();
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if (pid < 0) {
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return NULL;
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} else if (pid == 0) {
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int i;
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for (i=0; i<256; i++) {
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close(i);
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}
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execlp(exe, exe, "dhparam", "-out", cnf, "512", (char *)0);
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exit(1);
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}
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pidw = waitpid(pid, &status, 0);
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if (pidw != pid) {
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return NULL;
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}
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if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
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;
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} else {
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return NULL;
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}
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/* append result: */
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in = fopen(cnf, "r");
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if (in == NULL) {
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return NULL;
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}
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out = fopen(pem, "a");
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if (out == NULL) {
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fclose(in);
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return NULL;
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}
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while (fgets(line, 1024, in) != NULL) {
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fprintf(out, "%s", line);
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}
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fclose(in);
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fclose(out);
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unlink(cnf);
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free(exe);
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if (db) {
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char cmd[100];
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sprintf(cmd, "openssl x509 -text -in %s", pem);
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fprintf(stderr, "\n");
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system(cmd);
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fprintf(stderr, "\n");
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}
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return strdup(pem);
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}
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void openssl_init(void) {
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int db = 0, tmp_pem = 0, do_dh = 1;
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FILE *in;
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double ds;
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long mode;
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if (! quiet) {
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rfbLog("\n");
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rfbLog("Initializing SSL.\n");
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}
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if (db) fprintf(stderr, "\nSSL_load_error_strings()\n");
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SSL_load_error_strings();
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if (db) fprintf(stderr, "SSL_library_init()\n");
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SSL_library_init();
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if (db) fprintf(stderr, "init_prng()\n");
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init_prng();
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ctx = SSL_CTX_new( SSLv23_server_method() );
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if (ctx == NULL) {
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rfbLog("openssl_init: SSL_CTX_new failed.\n");
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sslerrexit();
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}
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ds = dnow();
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rsa_512 = RSA_generate_key(512,RSA_F4,NULL,NULL);
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if (rsa_512 == NULL) {
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rfbLog("openssl_init: RSA_generate_key(512) failed.\n");
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sslerrexit();
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}
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rfbLog("created 512 bit temporary RSA key: %.3fs\n", dnow() - ds);
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ds = dnow();
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rsa_1024 = RSA_generate_key(1024,RSA_F4,NULL,NULL);
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if (rsa_1024 == NULL) {
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rfbLog("openssl_init: RSA_generate_key(1024) failed.\n");
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sslerrexit();
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}
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rfbLog("created 1024 bit temporary RSA key: %.3fs\n", dnow() - ds);
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if (db) fprintf(stderr, "SSL_CTX_set_tmp_rsa()\n");
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if (! SSL_CTX_set_tmp_rsa(ctx, rsa_1024)) {
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rfbLog("openssl_init: SSL_CTX_set_tmp_rsa(1024) failed.\n");
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sslerrexit();
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}
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mode = 0;
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mode |= SSL_MODE_ENABLE_PARTIAL_WRITE;
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mode |= SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER;
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SSL_CTX_set_mode(ctx, mode);
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SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_BOTH);
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SSL_CTX_set_timeout(ctx, 300);
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ds = dnow();
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if (! openssl_pem) {
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openssl_pem = create_tmp_pem();
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if (! openssl_pem) {
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rfbLog("openssl_init: could not create temporary,"
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" self-signed PEM.\n");
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clean_up_exit(1);
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}
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tmp_pem = 1;
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}
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rfbLog("using PEM %s %.3fs\n", openssl_pem, dnow() - ds);
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if (do_dh) {
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DH *dh;
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BIO *bio;
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ds = dnow();
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in = fopen(openssl_pem, "r");
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if (in == NULL) {
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rfbLogPerror("fopen");
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clean_up_exit(1);
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}
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bio = BIO_new_fp(in, BIO_CLOSE|BIO_FP_TEXT);
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if (! bio) {
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rfbLog("openssl_init: BIO_new_fp() failed.\n");
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sslerrexit();
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}
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dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
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if (dh == NULL) {
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rfbLog("openssl_init: PEM_read_bio_DHparams() failed.\n");
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BIO_free(bio);
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sslerrexit();
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}
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BIO_free(bio);
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SSL_CTX_set_tmp_dh(ctx, dh);
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rfbLog("loaded Diffie Hellman %d bits, %.3fs\n",
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8*DH_size(dh), dnow()-ds);
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DH_free(dh);
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}
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if (! SSL_CTX_use_certificate_chain_file(ctx, openssl_pem)) {
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rfbLog("openssl_init: SSL_CTX_use_certificate_chain_file() failed.\n");
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sslerrexit();
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}
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if(! SSL_CTX_use_RSAPrivateKey_file(ctx, openssl_pem,
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SSL_FILETYPE_PEM)) {
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rfbLog("openssl_init: SSL_CTX_set_tmp_rsa(1024) failed.\n");
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sslerrexit();
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}
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if (! SSL_CTX_check_private_key(ctx)) {
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rfbLog("openssl_init: SSL_CTX_set_tmp_rsa(1024) failed.\n");
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sslerrexit();
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}
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if (tmp_pem && ! getenv("X11VNC_KEEP_TMP_PEM")) {
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if (getenv("X11VNC_SHOW_TMP_PEM")) {
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FILE *in = fopen(openssl_pem, "r");
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if (in != NULL) {
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char line[128];
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fprintf(stderr, "\n");
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while (fgets(line, 128, in) != NULL) {
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fprintf(stderr, "%s", line);
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}
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fprintf(stderr, "\n");
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fclose(in);
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}
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}
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unlink(openssl_pem);
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free(openssl_pem);
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}
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if (ssl_verify) {
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struct stat sbuf;
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int lvl;
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if (stat(ssl_verify, &sbuf) != 0) {
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rfbLog("openssl_init: -sslverify does not exists %s.\n",
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ssl_verify);
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rfbLogPerror("stat");
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clean_up_exit(1);
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}
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if (! S_ISDIR(sbuf.st_mode)) {
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if (! SSL_CTX_load_verify_locations(ctx, ssl_verify,
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NULL)) {
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rfbLog("openssl_init: SSL_CTX_load_verify_"
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"locations() failed.\n");
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sslerrexit();
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}
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} else {
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if (! SSL_CTX_load_verify_locations(ctx, NULL,
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ssl_verify)) {
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rfbLog("openssl_init: SSL_CTX_load_verify_"
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"locations() failed.\n");
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sslerrexit();
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}
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}
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lvl = SSL_VERIFY_FAIL_IF_NO_PEER_CERT|SSL_VERIFY_PEER;
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SSL_CTX_set_verify(ctx, lvl, NULL);
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} else {
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SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL);
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}
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if (db) fprintf(stderr, "\n");
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}
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void openssl_port(void) {
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int sock, shutdown = 0;
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static int port = 0;
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static in_addr_t iface = 0;
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int db = 0;
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if (! screen) {
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rfbLog("openssl_port: no screen!\n");
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clean_up_exit(1);
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}
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if (screen->listenSock > -1 && screen->port > 0) {
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port = screen->port;
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shutdown = 1;
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}
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if (screen->listenInterface) {
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iface = screen->listenInterface;
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}
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if (shutdown) {
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if (db) fprintf(stderr, "shutting down %d/%d\n",
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port, screen->listenSock);
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rfbShutdownSockets(screen);
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}
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sock = rfbListenOnTCPPort(port, iface);
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if (sock < 0) {
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rfbLog("openssl_port: could not reopen port %d\n", port);
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clean_up_exit(1);
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}
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if (db) fprintf(stderr, "listen on port/sock %d/%d\n", port, sock);
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openssl_sock = sock;
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ssl_initialized = 1;
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}
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static void lose_ram(void) {
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/*
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* for a forked child that will be around for a long time
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* without doing exec(). we really should re-exec, but a pain
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* to redo all SSL ctx.
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*/
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free_old_fb(main_fb, rfb_fb, cmap8to24_fb);
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main_fb = NULL;
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rfb_fb = NULL;
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cmap8to24_fb = NULL;
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if (snap_fb) {
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free(snap_fb);
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snap_fb = NULL;
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}
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if (raw_fb) {
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free(raw_fb);
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raw_fb = NULL;
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}
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free_tiles();
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}
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void ssh_helper_pid(pid_t pid, int sock) {
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# define HPSIZE 256
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static pid_t helpers[HPSIZE];
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static int sockets[HPSIZE], first = 1;
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int i, empty, set;
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if (first) {
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for (i=0; i < HPSIZE; i++) {
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helpers[i] = 0;
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sockets[i] = 0;
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}
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first = 0;
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}
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if (pid == 0) {
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/* killall */
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for (i=0; i < HPSIZE; i++) {
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if (helpers[i] == 0) {
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continue;
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sockets[i] = -1;
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}
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if (kill(helpers[i], 0) == 0) {
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int status;
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if (sockets[i] >= 0) {
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close(sockets[i]);
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}
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kill(helpers[i], SIGTERM);
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#if LIBVNCSERVER_HAVE_SYS_WAIT_H && LIBVNCSERVER_HAVE_WAITPID
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waitpid(helpers[i], &status, WNOHANG);
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#endif
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}
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helpers[i] = 0;
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sockets[i] = -1;
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}
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return;
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}
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/* add */
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set = 0;
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empty = -1;
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for (i=0; i < HPSIZE; i++) {
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if (helpers[i] == pid) {
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if (sock == -1) {
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helpers[i] = 0;
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}
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sockets[i] = sock;
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set = 1;
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} else if (empty == -1 && helpers[i] == 0) {
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empty = i;
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}
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}
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if (set || sock == -1) {
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return;
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}
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if (empty >= 0) {
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helpers[empty] = pid;
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sockets[empty] = sock;
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return;
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}
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for (i=0; i < HPSIZE; i++) {
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if (helpers[i] == 0) {
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continue;
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}
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if (kill(helpers[i], 0) != 0) {
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helpers[i] = 0;
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sockets[i] = -1;
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|
|
if (empty == -1) {
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empty = i;
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}
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}
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}
|
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if (empty >= 0) {
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helpers[empty] = pid;
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sockets[empty] = sock;
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}
|
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}
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|
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void accept_openssl(void) {
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int sock, cport, csock, vsock;
|
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int status, n, db = 0;
|
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struct sockaddr_in addr;
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socklen_t addrlen = sizeof(addr);
|
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char cookie[128], rcookie[128], *name;
|
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rfbClientPtr client;
|
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pid_t pid;
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|
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openssl_last_helper_pid = 0;
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|
|
sock = accept(openssl_sock, (struct sockaddr *)&addr, &addrlen);
|
|
if (sock < 0) {
|
|
rfbLog("accept_openssl: accept connection failed\n");
|
|
rfbLogPerror("accept");
|
|
return;
|
|
}
|
|
if (db) fprintf(stderr, "accept_openssl: sock: %d\n", sock);
|
|
|
|
cport = find_free_port(20000, 0);
|
|
if (! cport) {
|
|
rfbLog("accept_openssl: could not find open port.\n");
|
|
close(sock);
|
|
return;
|
|
}
|
|
if (db) fprintf(stderr, "accept_openssl: cport: %d\n", cport);
|
|
|
|
csock = rfbListenOnTCPPort(cport, htonl(INADDR_LOOPBACK));
|
|
if (csock < 0) {
|
|
rfbLog("accept_openssl: could not listen on port %d.\n",
|
|
cport);
|
|
close(sock);
|
|
return;
|
|
}
|
|
if (db) fprintf(stderr, "accept_openssl: csock: %d\n", csock);
|
|
|
|
fflush(stderr);
|
|
sprintf(cookie, "%f/%f", dnow(), x11vnc_start);
|
|
|
|
name = get_remote_host(sock);
|
|
if (name) {
|
|
rfbLog("SSL: spawning helper process to handle: %s\n", name);
|
|
free(name);
|
|
}
|
|
|
|
pid = fork();
|
|
if (pid < 0) {
|
|
rfbLog("accept_openssl: could not fork.\n");
|
|
rfbLogPerror("fork");
|
|
close(sock);
|
|
close(csock);
|
|
return;
|
|
} else if (pid == 0) {
|
|
int i, vncsock, sslsock = sock;
|
|
|
|
signal(SIGHUP, SIG_DFL);
|
|
signal(SIGINT, SIG_DFL);
|
|
signal(SIGQUIT, SIG_DFL);
|
|
signal(SIGTERM, SIG_DFL);
|
|
|
|
for (i=0; i<256; i++) {
|
|
if (i != sslsock && i != 2) {
|
|
close(i);
|
|
}
|
|
}
|
|
|
|
lose_ram();
|
|
|
|
vncsock = rfbConnectToTcpAddr("127.0.0.1", cport);
|
|
if (vncsock < 0) {
|
|
close(vncsock);
|
|
exit(1);
|
|
}
|
|
if (! ssl_init(vncsock, sslsock)) {
|
|
close(vncsock);
|
|
exit(1);
|
|
}
|
|
write(vncsock, cookie, strlen(cookie));
|
|
ssl_xfer(vncsock, sslsock);
|
|
exit(0);
|
|
}
|
|
close(sock);
|
|
|
|
vsock = accept(csock, (struct sockaddr *)&addr, &addrlen);
|
|
close(csock);
|
|
if (vsock < 0) {
|
|
rfbLog("accept_openssl: connection from ssl_helper failed.\n");
|
|
rfbLogPerror("accept");
|
|
|
|
kill(pid, SIGTERM);
|
|
waitpid(pid, &status, WNOHANG);
|
|
return;
|
|
}
|
|
if (db) fprintf(stderr, "accept_openssl: vsock: %d\n", vsock);
|
|
|
|
n = read(vsock, rcookie, strlen(cookie));
|
|
if (n != (int) strlen(cookie) || strncmp(cookie, rcookie, n)) {
|
|
rfbLog("accept_openssl: cookie from ssl_helper failed. %d\n", n);
|
|
if (errno != 0) {
|
|
rfbLogPerror("read");
|
|
}
|
|
if (db) fprintf(stderr, "'%s' '%s'\n", cookie, rcookie);
|
|
close(vsock);
|
|
|
|
kill(pid, SIGTERM);
|
|
waitpid(pid, &status, WNOHANG);
|
|
return;
|
|
}
|
|
if (db) fprintf(stderr, "accept_openssl: cookie good: %s\n", cookie);
|
|
|
|
rfbLog("SSL: handshake with helper process succeeded.\n");
|
|
|
|
openssl_last_helper_pid = pid;
|
|
ssh_helper_pid(pid, vsock);
|
|
client = rfbNewClient(screen, vsock);
|
|
openssl_last_helper_pid = 0;
|
|
if (client) {
|
|
if (db) fprintf(stderr, "accept_openssl: client %p\n", (void *) client);
|
|
} else {
|
|
rfbLog("accept_openssl: rfbNewClient failed.\n");
|
|
close(vsock);
|
|
|
|
kill(pid, SIGTERM);
|
|
waitpid(pid, &status, WNOHANG);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void ssl_timeout (int sig) {
|
|
fprintf(stderr, "sig: %d, ssh_init timed out.\n", sig);
|
|
exit(1);
|
|
}
|
|
|
|
static int ssl_init(int csock, int ssock) {
|
|
unsigned char *sid = (unsigned char *) "x11vnc SID";
|
|
char *name;
|
|
int db = 0, rc, err;
|
|
|
|
if (db) fprintf(stderr, "ssl_init: %d %d\n", csock, ssock);
|
|
ssl = SSL_new(ctx);
|
|
if (ssl == NULL) {
|
|
fprintf(stderr, "SSL_new failed\n");
|
|
return 0;
|
|
}
|
|
|
|
SSL_set_session_id_context(ssl, sid, strlen((char *)sid));
|
|
|
|
if (! SSL_set_fd(ssl, ssock)) {
|
|
fprintf(stderr, "SSL_set_fd failed\n");
|
|
return 0;
|
|
}
|
|
|
|
SSL_set_accept_state(ssl);
|
|
|
|
name = get_remote_host(ssock);
|
|
|
|
while (1) {
|
|
if (db) fprintf(stderr, "calling SSL_accept...\n");
|
|
|
|
signal(SIGALRM, ssl_timeout);
|
|
alarm(20);
|
|
|
|
rc = SSL_accept(ssl);
|
|
err = SSL_get_error(ssl, rc);
|
|
|
|
alarm(0);
|
|
signal(SIGALRM, SIG_DFL);
|
|
|
|
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: ssh_helper: SSL_accept() failed for: %s\n",
|
|
name);
|
|
return 0;
|
|
|
|
} else if (err == SSL_ERROR_WANT_WRITE) {
|
|
if (db) fprintf(stderr, "got SSL_ERROR_WANT_WRITE\n");
|
|
rfbLog("SSL: ssh_helper: SSL_accept() failed for: %s\n",
|
|
name);
|
|
return 0;
|
|
} else if (err == SSL_ERROR_SYSCALL) {
|
|
if (db) fprintf(stderr, "got SSL_ERROR_SYSCALL\n");
|
|
rfbLog("SSL: ssh_helper: SSL_accept() failed for: %s\n",
|
|
name);
|
|
return 0;
|
|
} else if (rc < 0) {
|
|
rfbLog("SSL: ssh_helper: SSL_accept() fatal: %d\n",
|
|
rc);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
rfbLog("SSL: ssh_helper: SSL_accept() succeeded for: %s\n", name);
|
|
free(name);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void ssl_xfer_debug(int csock, int ssock) {
|
|
char buf[2048];
|
|
int sz = 2048, n, m, status;
|
|
pid_t pid = fork();
|
|
int db = 1;
|
|
|
|
/* this is for testing, no SSL just socket redir */
|
|
if (pid < 0) {
|
|
exit(1);
|
|
}
|
|
if (pid) {
|
|
if (db) fprintf(stderr, "ssl_xfer start: %d -> %d\n", csock, ssock);
|
|
|
|
while (1) {
|
|
n = read(csock, buf, sz);
|
|
if (n == 0 || (n < 0 && errno != EINTR) ) {
|
|
break;
|
|
} else if (n > 0) {
|
|
m = write(ssock, buf, n);
|
|
if (m != n) {
|
|
if (db) fprintf(stderr, "ssl_xfer bad write: %d -> %d | %d/%d\n", csock, ssock, m, n);
|
|
break;
|
|
}
|
|
|
|
}
|
|
}
|
|
kill(pid, SIGTERM);
|
|
waitpid(pid, &status, WNOHANG);
|
|
if (db) fprintf(stderr, "ssl_xfer done: %d -> %d\n", csock, ssock);
|
|
|
|
} else {
|
|
if (db) fprintf(stderr, "ssl_xfer start: %d <- %d\n", csock, ssock);
|
|
|
|
while (1) {
|
|
n = read(ssock, buf, sz);
|
|
if (n == 0 || (n < 0 && errno != EINTR) ) {
|
|
break;
|
|
} else if (n > 0) {
|
|
m = write(csock, buf, n);
|
|
if (m != n) {
|
|
if (db) fprintf(stderr, "ssl_xfer bad write: %d <- %d | %d/%d\n", csock, ssock, m, n);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (db) fprintf(stderr, "ssl_xfer done: %d <- %d\n", csock, ssock);
|
|
|
|
}
|
|
close(csock);
|
|
close(ssock);
|
|
exit(0);
|
|
}
|
|
|
|
#define BSIZE 16384
|
|
static void ssl_xfer(int csock, int ssock) {
|
|
int db = 0, check_pending, fdmax, nfd, n, err;
|
|
char cbuf[BSIZE], sbuf[BSIZE];
|
|
int cptr, sptr, c_rd, c_wr, s_rd, s_wr;
|
|
fd_set rd, wr;
|
|
struct timeval tv;
|
|
|
|
if (db) {
|
|
ssl_xfer_debug(csock, ssock);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* csock: clear text socket with libvncserver. "C"
|
|
* ssock: ssl data socket with remote vnc viewer. "S"
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
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 BSIZE buffers */
|
|
sptr = 0;
|
|
|
|
while (1) {
|
|
int c_to_s, s_to_c;
|
|
|
|
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;
|
|
}
|
|
|
|
/* set up the fd sets for the two sockets for read & write: */
|
|
|
|
FD_ZERO(&rd);
|
|
|
|
if (c_rd && cptr < BSIZE) {
|
|
/* 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 < BSIZE || (cptr > 0 && SSL_want_read(ssl))) {
|
|
FD_SET(ssock, &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 < BSIZE && SSL_want_write(ssl))) {
|
|
FD_SET(ssock, &wr);
|
|
}
|
|
}
|
|
|
|
tv.tv_sec = 20;
|
|
tv.tv_usec = 0;
|
|
|
|
/* do the select, repeat if interrupted */
|
|
do {
|
|
nfd = select(fdmax+1, &rd, &wr, NULL, &tv);
|
|
} while (nfd < 0 && errno == EINTR);
|
|
|
|
if (nfd < 0) {
|
|
fprintf(stderr, "select error: %d\n", nfd);
|
|
perror("select");
|
|
/* connection finished */
|
|
return;
|
|
}
|
|
|
|
if (nfd == 0) {
|
|
fprintf(stderr, "timeout\n");
|
|
/* connection finished */
|
|
return;
|
|
}
|
|
|
|
/* used to see if SSL_pending() should be checked: */
|
|
check_pending = 0;
|
|
|
|
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 */
|
|
return;
|
|
}
|
|
/* proceed */
|
|
} else if (n == 0) {
|
|
/* connection finished XXX double check */
|
|
return;
|
|
} else {
|
|
/* shift over the data in sbuf by n */
|
|
memmove(sbuf, sbuf + n, sptr - n);
|
|
if (sptr == BSIZE) {
|
|
check_pending = 1;
|
|
}
|
|
sptr -= n;
|
|
|
|
if (! s_rd && sptr == 0) {
|
|
/* finished sending last of sbuf */
|
|
shutdown(csock, SHUT_WR);
|
|
c_wr = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (s_wr) {
|
|
if ((cptr > 0 && FD_ISSET(ssock, &wr)) ||
|
|
(SSL_want_read(ssl) && FD_ISSET(ssock, &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;
|
|
}
|
|
|
|
} 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 */
|
|
return;
|
|
}
|
|
/* proceed */
|
|
} else if (err == SSL_ERROR_ZERO_RETURN) {
|
|
/* S finished */
|
|
s_rd = 0;
|
|
s_wr = 0;
|
|
} else if (err == SSL_ERROR_SSL) {
|
|
/* connection finished */
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (c_rd && FD_ISSET(csock, &rd)) {
|
|
|
|
/* try to read some data from C into our cbuf */
|
|
|
|
n = read(csock, cbuf + cptr, BSIZE - cptr);
|
|
|
|
if (n < 0) {
|
|
if (errno != EINTR) {
|
|
/* connection finished */
|
|
return;
|
|
}
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
if (s_rd) {
|
|
if ((sptr < BSIZE && FD_ISSET(ssock, &rd)) ||
|
|
(SSL_want_write(ssl) && FD_ISSET(ssock, &wr)) ||
|
|
(check_pending && SSL_pending(ssl))) {
|
|
|
|
/* try to read some data from S into our sbuf */
|
|
|
|
n = SSL_read(ssl, sbuf + sptr, BSIZE - sptr);
|
|
err = SSL_get_error(ssl, n);
|
|
|
|
if (err == SSL_ERROR_NONE) {
|
|
/* good */
|
|
sptr += 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 */
|
|
return;
|
|
}
|
|
/* 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 */
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void check_openssl(void) {
|
|
fd_set fds;
|
|
struct timeval tv;
|
|
int nfds;
|
|
|
|
if (0) fprintf(stderr, "check_openssl()\n");
|
|
|
|
if (! use_openssl || openssl_sock < 0) {
|
|
return;
|
|
}
|
|
|
|
FD_ZERO(&fds);
|
|
FD_SET(openssl_sock, &fds);
|
|
|
|
tv.tv_sec = 0;
|
|
tv.tv_usec = 0;
|
|
|
|
nfds = select(openssl_sock+1, &fds, NULL, NULL, &tv);
|
|
|
|
if (nfds <= 0) {
|
|
return;
|
|
}
|
|
accept_openssl();
|
|
}
|
|
|
|
#define MSZ 4096
|
|
static void init_prng(void) {
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int db = 0, bytes;
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char file[MSZ];
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|
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RAND_file_name(file, MSZ);
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rfbLog("RAND_file_name: %s\n", file);
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|
|
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bytes = RAND_load_file(file, -1);
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if (db) fprintf(stderr, "bytes read: %d\n", bytes);
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|
|
|
bytes += RAND_load_file("/dev/urandom", 64);
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|
if (db) fprintf(stderr, "bytes read: %d\n", bytes);
|
|
|
|
if (bytes > 0) {
|
|
if (! quiet) {
|
|
rfbLog("initialized PRNG with %d random bytes.\n",
|
|
bytes);
|
|
}
|
|
return;
|
|
}
|
|
|
|
bytes += RAND_load_file("/dev/random", 8);
|
|
if (db) fprintf(stderr, "bytes read: %d\n", bytes);
|
|
if (! quiet) {
|
|
rfbLog("initialized PRNG with %d random bytes.\n", bytes);
|
|
}
|
|
}
|
|
#endif /* FORK_OK */
|
|
#endif /* LIBVNCSERVER_HAVE_LIBSSL */
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|
|