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727 lines
15 KiB
727 lines
15 KiB
/* -- sslcmds.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 "sslhelper.h"
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#include "ssltools.h"
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#include "connections.h"
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#if LIBVNCSERVER_HAVE_FORK
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#if LIBVNCSERVER_HAVE_SYS_WAIT_H
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#if LIBVNCSERVER_HAVE_WAITPID
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#define SSLCMDS
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#endif
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#endif
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#endif
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#ifdef REL81
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#undef SSLCMDS
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#endif
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void check_stunnel(void);
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int start_stunnel(int stunnel_port, int x11vnc_port);
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void stop_stunnel(void);
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void setup_stunnel(int rport, int *argc, char **argv);
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char *get_Cert_dir(char *cdir_in, char **tmp_in);
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void sslGenCA(char *cdir);
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void sslGenCert(char *ty, char *nm);
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void sslEncKey(char *path, int info_only);
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static pid_t stunnel_pid = 0;
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void check_stunnel(void) {
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static time_t last_check = 0;
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time_t now = time(NULL);
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if (last_check + 3 >= now) {
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return;
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}
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last_check = now;
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/* double check that stunnel is still running: */
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if (stunnel_pid > 0) {
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int status;
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#ifdef SSLCMDS
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waitpid(stunnel_pid, &status, WNOHANG);
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#endif
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if (kill(stunnel_pid, 0) != 0) {
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#ifdef SSLCMDS
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waitpid(stunnel_pid, &status, WNOHANG);
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#endif
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rfbLog("stunnel subprocess %d died.\n", stunnel_pid);
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stunnel_pid = 0;
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clean_up_exit(1);
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}
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}
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}
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int start_stunnel(int stunnel_port, int x11vnc_port) {
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#ifdef SSLCMDS
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char extra[] = ":/usr/sbin:/usr/local/sbin:/dist/sbin";
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char *path, *p, *exe;
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char *stunnel_path = NULL;
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struct stat verify_buf;
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int status;
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if (stunnel_pid) {
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stop_stunnel();
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}
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stunnel_pid = 0;
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path = getenv("PATH");
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if (! path) {
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path = strdup(extra+1);
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} else {
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char *pt = path;
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path = (char *) malloc(strlen(path)+strlen(extra)+1);
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if (! path) {
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return 0;
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}
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strcpy(path, pt);
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strcat(path, extra);
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}
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exe = (char *) malloc(strlen(path) + 1 + strlen("stunnel") + 1);
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p = strtok(path, ":");
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exe[0] = '\0';
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while (p) {
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struct stat sbuf;
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sprintf(exe, "%s/%s", p, "stunnel");
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if (! stunnel_path && stat(exe, &sbuf) == 0) {
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if (! S_ISDIR(sbuf.st_mode)) {
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stunnel_path = exe;
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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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if (path) {
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free(path);
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}
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if (! stunnel_path) {
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free(exe);
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return 0;
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}
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if (stunnel_path[0] == '\0') {
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free(exe);
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return 0;
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}
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/* stunnel */
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if (no_external_cmds || !cmd_ok("stunnel")) {
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rfbLogEnable(1);
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rfbLog("start_stunnel: cannot run external commands in -nocmds mode:\n");
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rfbLog(" \"%s\"\n", stunnel_path);
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rfbLog(" exiting.\n");
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clean_up_exit(1);
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}
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if (! quiet) {
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rfbLog("\n");
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rfbLog("starting ssl tunnel: %s %d -> %d\n", stunnel_path,
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stunnel_port, x11vnc_port);
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}
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if (stunnel_pem && strstr(stunnel_pem, "SAVE") == stunnel_pem) {
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stunnel_pem = get_saved_pem(stunnel_pem, 1);
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if (! stunnel_pem) {
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rfbLog("start_stunnel: could not create or open"
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" saved PEM.\n");
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clean_up_exit(1);
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}
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}
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if (ssl_verify) {
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if (stat(ssl_verify, &verify_buf) != 0) {
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rfbLog("stunnel: %s does not exist.\n", ssl_verify);
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clean_up_exit(1);
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}
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}
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stunnel_pid = fork();
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if (stunnel_pid < 0) {
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stunnel_pid = 0;
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free(exe);
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return 0;
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}
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if (stunnel_pid == 0) {
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FILE *in;
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char fd[20];
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int i;
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for (i=3; i<256; i++) {
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close(i);
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}
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if (use_stunnel == 3) {
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char sp[30], xp[30], *a = NULL;
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char *st = stunnel_path;
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char *pm = stunnel_pem;
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char *sv = ssl_verify;
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sprintf(sp, "%d", stunnel_port);
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sprintf(xp, "%d", x11vnc_port);
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if (ssl_verify) {
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if(S_ISDIR(verify_buf.st_mode)) {
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a = "-a";
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} else {
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a = "-A";
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}
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}
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if (stunnel_pem && ssl_verify) {
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/* XXX double check -v 2 */
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execlp(st, st, "-f", "-d", sp, "-r", xp, "-P",
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"none", "-p", pm, a, sv, "-v", "2",
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(char *) NULL);
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} else if (stunnel_pem && !ssl_verify) {
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execlp(st, st, "-f", "-d", sp, "-r", xp, "-P",
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"none", "-p", pm,
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(char *) NULL);
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} else if (!stunnel_pem && ssl_verify) {
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execlp(st, st, "-f", "-d", sp, "-r", xp, "-P",
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"none", a, sv, "-v", "2",
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(char *) NULL);
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} else {
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execlp(st, st, "-f", "-d", sp, "-r", xp, "-P",
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"none", (char *) NULL);
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}
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exit(1);
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}
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in = tmpfile();
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if (! in) {
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exit(1);
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}
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fprintf(in, "foreground = yes\n");
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fprintf(in, "pid =\n");
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if (stunnel_pem) {
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fprintf(in, "cert = %s\n", stunnel_pem);
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}
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if (ssl_verify) {
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if(S_ISDIR(verify_buf.st_mode)) {
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fprintf(in, "CApath = %s\n", ssl_verify);
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} else {
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fprintf(in, "CAfile = %s\n", ssl_verify);
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}
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/* XXX double check -v 2 */
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fprintf(in, "verify = 2\n");
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}
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fprintf(in, ";debug = 7\n\n");
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fprintf(in, "[x11vnc_stunnel]\n");
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fprintf(in, "accept = %d\n", stunnel_port);
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fprintf(in, "connect = %d\n", x11vnc_port);
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fflush(in);
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rewind(in);
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sprintf(fd, "%d", fileno(in));
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execlp(stunnel_path, stunnel_path, "-fd", fd, (char *) NULL);
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exit(1);
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}
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free(exe);
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usleep(500 * 1000);
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waitpid(stunnel_pid, &status, WNOHANG);
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if (kill(stunnel_pid, 0) != 0) {
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waitpid(stunnel_pid, &status, WNOHANG);
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stunnel_pid = 0;
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return 0;
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}
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if (! quiet) {
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rfbLog("stunnel pid is: %d\n", (int) stunnel_pid);
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}
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return 1;
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#else
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return 0;
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#endif
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}
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void stop_stunnel(void) {
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int status;
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if (! stunnel_pid) {
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return;
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}
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#ifdef SSLCMDS
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kill(stunnel_pid, SIGTERM);
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usleep (150 * 1000);
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kill(stunnel_pid, SIGKILL);
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usleep (50 * 1000);
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waitpid(stunnel_pid, &status, WNOHANG);
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#endif
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stunnel_pid = 0;
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}
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void setup_stunnel(int rport, int *argc, char **argv) {
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int i, xport = 0;
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if (! rport && argc && argv) {
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for (i=0; i< *argc; i++) {
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if (argv[i] && !strcmp(argv[i], "-rfbport")) {
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if (i < *argc - 1) {
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rport = atoi(argv[i+1]);
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break;
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}
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}
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}
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}
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if (! rport) {
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/* we do our own autoprobing then... */
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rport = find_free_port(5900, 5999);
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if (! rport) {
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goto stunnel_fail;
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}
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}
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xport = find_free_port(5950, 5999);
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if (! xport) {
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goto stunnel_fail;
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}
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if (start_stunnel(rport, xport)) {
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int tweaked = 0;
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char tmp[30];
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sprintf(tmp, "%d", xport);
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if (argc && argv) {
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for (i=0; i < *argc; i++) {
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if (argv[i] && !strcmp(argv[i], "-rfbport")) {
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if (i < *argc - 1) {
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/* replace orig value */
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argv[i+i] = strdup(tmp);
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tweaked = 1;
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break;
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}
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}
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}
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if (! tweaked) {
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i = *argc;
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argv[i] = strdup("-rfbport");
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argv[i+1] = strdup(tmp);
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*argc += 2;
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got_rfbport = 1;
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}
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}
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stunnel_port = rport;
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ssl_initialized = 1;
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return;
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}
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stunnel_fail:
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rfbLog("failed to start stunnel.\n");
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clean_up_exit(1);
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}
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char *get_Cert_dir(char *cdir_in, char **tmp_in) {
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char *cdir, *home, *tmp;
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struct stat sbuf;
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int i;
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char *cases1[] = {"/.vnc", "/.vnc/certs", "/.vnc/certs/CA"};
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char *cases2[] = {"", "/CA", "/tmp"};
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if (cdir_in != NULL) {
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cdir = cdir_in;
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} else {
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cdir = ssl_certs_dir;
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}
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if (cdir == NULL) {
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home = get_home_dir();
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if (! home) {
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return NULL;
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}
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cdir = (char *) malloc(strlen(home) + strlen("/.vnc/certs/CA") + 1);
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for (i=0; i<3; i++) {
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sprintf(cdir, "%s%s", home, cases1[i]);
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if (stat(cdir, &sbuf) != 0) {
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rfbLog("creating dir: %s\n", cdir);
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if (mkdir(cdir, 0755) != 0) {
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rfbLog("could not create directory %s\n", cdir);
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rfbLogPerror("mkdir");
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return NULL;
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}
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} else if (! S_ISDIR(sbuf.st_mode)) {
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rfbLog("not a directory: %s\n", cdir);
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return NULL;
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}
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}
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sprintf(cdir, "%s%s", home, cases1[1]);
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}
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tmp = (char *) malloc(strlen(cdir) + strlen("/tmp") + 1);
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for (i=0; i<3; i++) {
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int ret;
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sprintf(tmp, "%s%s", cdir, cases2[i]);
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if (stat(tmp, &sbuf) != 0) {
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rfbLog("creating dir: %s\n", tmp);
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if (! strcmp(cases2[i], "/tmp")) {
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ret = mkdir(tmp, 0700);
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} else {
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ret = mkdir(tmp, 0755);
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}
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if (ret != 0) {
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rfbLog("could not create directory %s\n", tmp);
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rfbLogPerror("mkdir");
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return NULL;
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}
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} else if (! S_ISDIR(sbuf.st_mode)) {
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rfbLog("not a directory: %s\n", tmp);
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return NULL;
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}
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}
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sprintf(tmp, "%s/tmp", cdir);
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*tmp_in = tmp;
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return cdir;
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}
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static char *getsslscript(char *cdir, char *name, char *script) {
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char *openssl = find_openssl_bin();
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char *tmp, *scr, *cdir_use;
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FILE *out;
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if (! openssl || openssl[0] == '\0') {
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exit(1);
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}
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if (!name || !script) {
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exit(1);
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}
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cdir_use = get_Cert_dir(cdir, &tmp);
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if (!cdir_use || !tmp) {
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exit(1);
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}
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scr = (char *) malloc(strlen(tmp) + 1 + strlen(name) + 30);
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sprintf(scr, "%s/%s.%d.sh", tmp, name, getpid());
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out = fopen(scr, "w");
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if (! out) {
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rfbLog("could not open: %s\n", scr);
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rfbLogPerror("fopen");
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exit(1);
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}
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fprintf(out, "%s", script);
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fclose(out);
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rfbLog("Using openssl: %s\n", openssl);
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rfbLog("Using certs dir: %s\n", cdir_use);
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fprintf(stderr, "\n");
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set_env("BASE_DIR", cdir_use);
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set_env("OPENSSL", openssl);
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return scr;
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}
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void sslGenCA(char *cdir) {
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char *cmd, *scr = getsslscript(cdir, "genca", genCA);
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if (! scr) {
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exit(1);
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}
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cmd = (char *)malloc(strlen("/bin/sh ") + strlen(scr) + 1);
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sprintf(cmd, "/bin/sh %s", scr);
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system(cmd);
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unlink(scr);
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free(cmd);
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free(scr);
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}
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void sslGenCert(char *ty, char *nm) {
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char *cmd, *scr = getsslscript(NULL, "gencert", genCert);
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if (! scr) {
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exit(1);
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}
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cmd = (char *)malloc(strlen("/bin/sh ") + strlen(scr) + 1);
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sprintf(cmd, "/bin/sh %s", scr);
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if (! ty) {
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set_env("TYPE", "");
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} else {
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set_env("TYPE", ty);
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}
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if (! nm) {
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set_env("NAME", "");
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} else {
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char *q = strstr(nm, "SAVE-");
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if (!strcmp(nm, "SAVE")) {
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set_env("NAME", "");
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} else if (q == nm) {
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q += strlen("SAVE-");
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set_env("NAME", q);
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} else {
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set_env("NAME", nm);
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}
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}
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system(cmd);
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unlink(scr);
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free(cmd);
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free(scr);
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}
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void sslEncKey(char *path, int mode) {
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char *openssl = find_openssl_bin();
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char *scr, *cert = NULL, *tca, *cdir = NULL;
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char line[1024], tmp[] = "/tmp/x11vnc-tmp.XXXXXX";
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int tmp_fd, incert, info_only = 0, delete_only = 0, listlong = 0;
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struct stat sbuf;
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FILE *file;
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static int depth = 0;
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if (depth > 0) {
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/* get_saved_pem may call us back. */
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return;
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}
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if (! path) {
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return;
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}
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depth++;
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if (mode == 1) {
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info_only = 1;
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} else if (mode == 2) {
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delete_only = 1;
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}
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if (! openssl) {
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exit(1);
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}
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cdir = get_Cert_dir(NULL, &tca);
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if (! cdir || ! tca) {
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fprintf(stderr, "could not find Cert dir\n");
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exit(1);
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}
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if (!strcasecmp(path, "LL") || !strcasecmp(path, "LISTL")) {
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listlong = 1;
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path = "LIST";
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}
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if (strstr(path, "SAVE") == path) {
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char *p = get_saved_pem(path, 0);
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if (p == NULL) {
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fprintf(stderr, "could not find saved pem "
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"matching: %s\n", path);
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exit(1);
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}
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path = p;
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} else if (!strcmp(path, "CA")) {
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tca = (char *) malloc(strlen(cdir)+strlen("/CA/cacert.pem")+1);
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sprintf(tca, "%s/CA/cacert.pem", cdir);
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path = tca;
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} else if (info_only && (!strcasecmp(path, "LIST") ||
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!strcasecmp(path, "LS") || !strcasecmp(path, "ALL"))) {
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if (! program_name || strchr(program_name, ' ')) {
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fprintf(stderr, "bad program name.\n");
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exit(1);
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}
|
|
if (strchr(cdir, '\'')) {
|
|
fprintf(stderr, "bad certdir char: %s\n", cdir);
|
|
exit(1);
|
|
}
|
|
|
|
tca = (char *) malloc(2*strlen(cdir)+strlen(program_name)+1000);
|
|
|
|
sprintf(tca, "find '%s' | egrep '/(CA|tmp|clients)$|"
|
|
"\\.(crt|pem|key|req)$' | grep -v CA/newcerts", cdir);
|
|
|
|
if (!strcasecmp(path, "ALL")) {
|
|
/* ugh.. */
|
|
strcat(tca, " | egrep -v 'private/cakey.pem|"
|
|
"(CA|tmp|clients)$' | xargs -n1 ");
|
|
strcat(tca, program_name);
|
|
strcat(tca, " -ssldir '");
|
|
strcat(tca, cdir);
|
|
strcat(tca, "' -sslCertInfo 2>&1 ");
|
|
} else if (listlong) {
|
|
strcat(tca, " | xargs ls -ld ");
|
|
}
|
|
system(tca);
|
|
free(tca);
|
|
|
|
depth--;
|
|
return;
|
|
|
|
} else if (info_only && (!strcasecmp(path, "HASHON")
|
|
|| !strcasecmp(path, "HASHOFF"))) {
|
|
|
|
tmp_fd = mkstemp(tmp);
|
|
if (tmp_fd < 0) {
|
|
exit(1);
|
|
}
|
|
|
|
write(tmp_fd, genCert, strlen(genCert));
|
|
close(tmp_fd);
|
|
|
|
scr = (char *) malloc(strlen("/bin/sh ") + strlen(tmp) + 1);
|
|
sprintf(scr, "/bin/sh %s", tmp);
|
|
|
|
set_env("BASE_DIR", cdir);
|
|
set_env("OPENSSL", openssl);
|
|
set_env("TYPE", "server");
|
|
if (!strcasecmp(path, "HASHON")) {
|
|
set_env("HASHON", "1");
|
|
} else {
|
|
set_env("HASHOFF", "1");
|
|
}
|
|
system(scr);
|
|
unlink(tmp);
|
|
free(scr);
|
|
|
|
depth--;
|
|
return;
|
|
}
|
|
|
|
|
|
if (stat(path, &sbuf) != 0) {
|
|
if (strstr(path, "client") || strchr(path, '/') == NULL) {
|
|
int i;
|
|
tca = (char *) malloc(strlen(cdir) + strlen(path) + 100);
|
|
for (i = 1; i <= 15; i++) {
|
|
tca[0] = '\0';
|
|
if ( i == 1) {
|
|
sprintf(tca, "%s/%s", cdir, path);
|
|
} else if (i == 2 && mode > 0) {
|
|
sprintf(tca, "%s/%s.crt", cdir, path);
|
|
} else if (i == 3) {
|
|
sprintf(tca, "%s/%s.pem", cdir, path);
|
|
} else if (i == 4 && mode > 1) {
|
|
sprintf(tca, "%s/%s.req", cdir, path);
|
|
} else if (i == 5 && mode > 1) {
|
|
sprintf(tca, "%s/%s.key", cdir, path);
|
|
} else if (i == 6) {
|
|
sprintf(tca, "%s/clients/%s", cdir, path);
|
|
} else if (i == 7 && mode > 0) {
|
|
sprintf(tca, "%s/clients/%s.crt", cdir, path);
|
|
} else if (i == 8) {
|
|
sprintf(tca, "%s/clients/%s.pem", cdir, path);
|
|
} else if (i == 9 && mode > 1) {
|
|
sprintf(tca, "%s/clients/%s.req", cdir, path);
|
|
} else if (i == 10 && mode > 1) {
|
|
sprintf(tca, "%s/clients/%s.key", cdir, path);
|
|
} else if (i == 11) {
|
|
sprintf(tca, "%s/server-%s", cdir, path);
|
|
} else if (i == 12 && mode > 0) {
|
|
sprintf(tca, "%s/server-%s.crt", cdir, path);
|
|
} else if (i == 13) {
|
|
sprintf(tca, "%s/server-%s.pem", cdir, path);
|
|
} else if (i == 14 && mode > 1) {
|
|
sprintf(tca, "%s/server-%s.req", cdir, path);
|
|
} else if (i == 15 && mode > 1) {
|
|
sprintf(tca, "%s/server-%s.key", cdir, path);
|
|
}
|
|
if (tca[0] == '\0') {
|
|
continue;
|
|
}
|
|
if (stat(tca, &sbuf) == 0) {
|
|
path = tca;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (stat(path, &sbuf) != 0) {
|
|
rfbLog("sslEncKey: %s\n", path);
|
|
rfbLogPerror("stat");
|
|
exit(1);
|
|
}
|
|
|
|
if (! info_only) {
|
|
cert = (char *) malloc(2*(sbuf.st_size + 1024));
|
|
file = fopen(path, "r");
|
|
if (file == NULL) {
|
|
rfbLog("sslEncKey: %s\n", path);
|
|
rfbLogPerror("fopen");
|
|
exit(1);
|
|
}
|
|
incert = 0;
|
|
cert[0] = '\0';
|
|
while (fgets(line, 1024, file) != NULL) {
|
|
if (strstr(line, "-----BEGIN CERTIFICATE-----")
|
|
== line) {
|
|
incert = 1;
|
|
}
|
|
if (incert) {
|
|
if (strlen(cert)+strlen(line) <
|
|
2 * (size_t) sbuf.st_size) {
|
|
strcat(cert, line);
|
|
}
|
|
}
|
|
if (strstr(line, "-----END CERTIFICATE-----")
|
|
== line) {
|
|
incert = 0;
|
|
}
|
|
}
|
|
fclose(file);
|
|
}
|
|
|
|
tmp_fd = mkstemp(tmp);
|
|
if (tmp_fd < 0) {
|
|
exit(1);
|
|
}
|
|
|
|
write(tmp_fd, genCert, strlen(genCert));
|
|
close(tmp_fd);
|
|
|
|
scr = (char *) malloc(strlen("/bin/sh ") + strlen(tmp) + 1);
|
|
sprintf(scr, "/bin/sh %s", tmp);
|
|
|
|
set_env("BASE_DIR", "/no/such/dir");
|
|
set_env("OPENSSL", openssl);
|
|
set_env("TYPE", "server");
|
|
if (info_only) {
|
|
set_env("INFO_ONLY", path);
|
|
} else if (delete_only) {
|
|
set_env("DELETE_ONLY", path);
|
|
} else {
|
|
set_env("ENCRYPT_ONLY", path);
|
|
}
|
|
system(scr);
|
|
unlink(tmp);
|
|
|
|
if (! mode && cert && cert[0] != '\0') {
|
|
file = fopen(path, "a");
|
|
if (file == NULL) {
|
|
rfbLog("sslEncKey: %s\n", path);
|
|
rfbLogPerror("fopen");
|
|
exit(1);
|
|
}
|
|
fprintf(file, "%s", cert);
|
|
fclose(file);
|
|
free(cert);
|
|
}
|
|
|
|
depth--;
|
|
}
|
|
|