mirror of
https://github.com/vanhauser-thc/thc-hydra.git
synced 2024-10-17 22:40:20 -07:00
250 lines
7.3 KiB
C
250 lines
7.3 KiB
C
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/*
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* Tested against RealVNC P4.6.0 using 3.3 and 4.1 RFB
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* proto with None and VLC auth (david@)
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*
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*/
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#include "d3des.h"
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#include "hydra-mod.h"
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#define CHALLENGESIZE 16
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// for RFB 003.003 & 003.005
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#define RFB33 1
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// for RFB 3.7 and onwards
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#define RFB37 2
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int32_t vnc_client_version = RFB33;
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int32_t failed_auth = 0;
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extern char *HYDRA_EXIT;
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static char *buf;
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/*
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* Encrypt CHALLENGESIZE bytes in memory using a password.
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* Ripped from vncauth.c
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*/
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void vncEncryptBytes(unsigned char *bytes, char *passwd) {
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unsigned char key[8];
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int32_t i;
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/* key is simply password padded with nulls */
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for (i = 0; i < 8; i++) {
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if (i < strlen(passwd)) {
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key[i] = passwd[i];
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} else {
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key[i] = 0;
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}
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}
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deskey(key, EN0);
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for (i = 0; i < CHALLENGESIZE; i += 8) {
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des(bytes + i, bytes + i);
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}
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}
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int32_t start_vnc(int32_t s, char *ip, int32_t port, unsigned char options, char *miscptr, FILE *fp) {
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char *empty = "";
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char *pass;
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unsigned char buf2[CHALLENGESIZE + 4];
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if (strlen(pass = hydra_get_next_password()) == 0)
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pass = empty;
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recv(s, buf2, CHALLENGESIZE + 4, 0);
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if (vnc_client_version == RFB37) {
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int32_t i;
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// fprintf(stderr,"number of security types supported: %d\n", buf2[0]);
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if (buf2[0] == 0 || buf2[0] > CHALLENGESIZE + 4) {
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hydra_report(stderr, "[ERROR] VNC server connection failed\n");
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hydra_child_exit(0);
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}
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for (i = 1; i <= buf2[0]; i++) {
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// fprintf(stderr,"sec type %u\n",buf2[i]);
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// check if weak security types are available
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if (buf2[i] <= 0x2) {
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buf2[3] = buf2[i];
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break;
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}
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}
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}
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// supported security type
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switch (buf2[3]) {
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case 0x0:
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hydra_report(stderr, "[ERROR] VNC server told us to quit %c\n", buf2[3]);
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hydra_child_exit(0);
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break;
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case 0x1:
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hydra_report(fp, "VNC server does not require authentication.\n");
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if (fp != stdout)
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hydra_report(stdout, "VNC server does not require authentication.\n");
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hydra_report_found_host(port, ip, "vnc", fp);
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hydra_completed_pair_found();
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hydra_child_exit(2);
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break;
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case 0x2:
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// VNC security type supported is the only type supported for now
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if (vnc_client_version == RFB37) {
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sprintf(buf, "%c", 0x2);
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if (hydra_send(s, buf, strlen(buf), 0) < 0) {
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return 1;
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}
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// get authentication challenge from server
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if (recv(s, buf2, CHALLENGESIZE, 0) == -1)
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return 1;
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// send response
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vncEncryptBytes(buf2, pass);
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if (hydra_send(s, (char *)buf2, CHALLENGESIZE, 0) < 0) {
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return 1;
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}
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} else {
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// in old proto, challenge is following the security type
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vncEncryptBytes((unsigned char *)buf2 + 4, pass);
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if (hydra_send(s, (char *)buf2 + 4, CHALLENGESIZE, 0) < 0) {
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return 1;
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}
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}
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break;
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default:
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hydra_report(stderr, "[ERROR] unknown VNC security type 0x%x\n", buf2[3]);
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hydra_child_exit(2);
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}
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// check security result value
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recv(s, buf, 4, 0);
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if (buf == NULL)
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return 1;
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switch (buf[3]) {
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case 0x0:
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hydra_report_found_host(port, ip, "vnc", fp);
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hydra_completed_pair_found();
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free(buf);
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failed_auth = 0;
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if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
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return 3;
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return 1;
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case 0x1:
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free(buf);
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if (verbose)
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hydra_report(stderr, "[VERBOSE] Authentication failed for password %s\n", pass);
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hydra_completed_pair();
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if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
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return 3;
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return 1;
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default:
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hydra_report(stderr, "[ERROR] unknown VNC server security result %d\n", buf[3]);
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free(buf);
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return 1;
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}
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return 1; /* never reached */
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}
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void service_vnc(char *ip, int32_t sp, unsigned char options, char *miscptr, FILE *fp, int32_t port, char *hostname) {
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int32_t run = 1, next_run = 1, sock = -1;
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int32_t myport = PORT_VNC, mysslport = PORT_VNC_SSL;
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hydra_register_socket(sp);
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if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
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return;
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while (1) {
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switch (run) {
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case 1: /* connect and service init function */
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if (sock >= 0)
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sock = hydra_disconnect(sock);
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if ((options & OPTION_SSL) == 0) {
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if (port != 0)
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myport = port;
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sock = hydra_connect_tcp(ip, myport);
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port = myport;
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} else {
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if (port != 0)
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mysslport = port;
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sock = hydra_connect_ssl(ip, mysslport, hostname);
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port = mysslport;
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}
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if (sock < 0) {
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hydra_report(stderr, "[ERROR] Child with pid %d terminating, can not connect\n", (int32_t)getpid());
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hydra_child_exit(1);
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}
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usleepn(300);
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buf = hydra_receive_line(sock);
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if (buf == NULL || (strncmp(buf, "RFB", 3) != 0)) { /* check the first line */
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hydra_report(stderr, "[ERROR] Not a VNC protocol or service shutdown: %s\n", buf);
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hydra_child_exit(2);
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}
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if (strstr(buf, " security failures") != NULL) { /* check the first line */
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/*
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VNC has a 'blacklisting' scheme that blocks an IP address after five
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unsuccessful connection attempts. The IP address is initially blocked
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for ten seconds, but this doubles for each unsuccessful attempt
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thereafter. A successful connection from an IP address resets the
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blacklist timeout. This is built in to VNC Server and does not rely
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on operating system support.
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*/
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failed_auth++;
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hydra_report(stderr, "VNC server reported too many authentication "
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"failures, have to wait some seconds ...\n");
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sleep(12 * failed_auth);
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free(buf);
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next_run = 1;
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break;
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}
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if (verbose)
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hydra_report(stderr, "[VERBOSE] Server banner is %s\n", buf);
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if (((strstr(buf, "RFB 005.000") != NULL) || (strstr(buf, "RFB 004") != NULL) || (strstr(buf, "RFB 003.007") != NULL) || (strstr(buf, "RFB 003.008") != NULL))) {
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// using proto version 003.007 to talk to server 005.xxx and 004.xxx
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// same for 3.7 and 3.8
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vnc_client_version = RFB37;
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free(buf);
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buf = strdup("RFB 003.007\n");
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} else {
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// for RFB 3.3 and fake 3.5
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vnc_client_version = RFB33;
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free(buf);
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buf = strdup("RFB 003.003\n");
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}
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hydra_send(sock, buf, strlen(buf), 0);
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next_run = 2;
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break;
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case 2: /* run the cracking function */
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next_run = start_vnc(sock, ip, port, options, miscptr, fp);
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break;
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case 3: /* clean exit */
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if (sock >= 0)
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sock = hydra_disconnect(sock);
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hydra_child_exit(0);
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return;
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case 4:
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if (sock >= 0)
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sock = hydra_disconnect(sock);
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hydra_child_exit(2);
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return;
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default:
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hydra_report(stderr, "[ERROR] Caught unknown return code, exiting!\n");
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hydra_child_exit(0);
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}
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run = next_run;
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}
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}
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int32_t service_vnc_init(char *ip, int32_t sp, unsigned char options, char *miscptr, FILE *fp, int32_t port, char *hostname) {
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// called before the childrens are forked off, so this is the function
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// which should be filled if initial connections and service setup has to be
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// performed once only.
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//
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// fill if needed.
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//
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// return codes:
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// 0 all OK
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// -1 error, hydra will exit, so print a good error message here
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return 0;
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}
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