#include "hydra-mod.h"
#include <arpa/telnet.h>
extern char *HYDRA_EXIT;
char *buf;
int32_t no_line_mode;
int32_t start_telnet(int32_t s, char *ip, int32_t port, unsigned char options, char *miscptr, FILE *fp) {
char *empty = "";
char *login, *pass, buffer[300];
int32_t i = 0;
if (strlen(login = hydra_get_next_login()) == 0)
login = empty;
if (strlen(pass = hydra_get_next_password()) == 0)
pass = empty;
sprintf(buffer, "%.250s\r", login);
if (no_line_mode) {
for (i = 0; i < strlen(buffer); i++) {
if (strcmp(&buffer[i], "\r") == 0) {
send(s, "\r\0", 2, 0);
} else {
send(s, &buffer[i], 1, 0);
}
usleepn(20);
}
} else {
if (hydra_send(s, buffer, strlen(buffer) + 1, 0) < 0) {
return 1;
}
}
do {
if ((buf = hydra_receive_line(s)) == NULL)
return 1;
if (index(buf, '/') != NULL || index(buf, '>') != NULL || index(buf, '%') != NULL || index(buf, '$') != NULL || index(buf, '#') != NULL) {
hydra_report_found_host(port, ip, "telnet", fp);
hydra_completed_pair_found();
free(buf);
if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
return 3;
return 1;
}
(void)make_to_lower(buf);
if (hydra_strcasestr(buf, "asswor") != NULL || hydra_strcasestr(buf, "asscode") != NULL || hydra_strcasestr(buf, "ennwort") != NULL)
i = 1;
if (i == 0 && ((strstr(buf, "ogin:") != NULL && strstr(buf, "last login") == NULL) || strstr(buf, "sername:") != NULL)) {
free(buf);
hydra_completed_pair();
if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
return 3;
return 2;
}
free(buf);
} while (i == 0);
sprintf(buffer, "%.250s\r", pass);
if (no_line_mode) {
for (i = 0; i < strlen(buffer); i++) {
if (strcmp(&buffer[i], "\r") == 0) {
send(s, "\r\0", 2, 0);
} else {
send(s, &buffer[i], 1, 0);
}
usleepn(20);
}
} else {
if (hydra_send(s, buffer, strlen(buffer) + 1, 0) < 0) {
return 1;
}
}
/*win7 answering with do terminal type = 0xfd 0x18 */
while ((buf = hydra_receive_line(s)) != NULL && make_to_lower(buf) && (strstr(buf, "login:") == NULL || strstr(buf, "last login:") != NULL) && strstr(buf, "sername:") == NULL) {
if ((miscptr != NULL && strstr(buf, miscptr) != NULL) || (miscptr == NULL && strstr(buf, "invalid") == NULL && strstr(buf, "failed") == NULL && strstr(buf, "bad ") == NULL && (index(buf, '/') != NULL || index(buf, '>') != NULL || index(buf, '$') != NULL || index(buf, '#') != NULL || index(buf, '%') != NULL || ((buf[1] == '\xfd') && (buf[2] == '\x18'))))) {
hydra_report_found_host(port, ip, "telnet", fp);
hydra_completed_pair_found();
free(buf);
if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
return 3;
return 1;
}
free(buf);
}
hydra_completed_pair();
if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
return 3;
return 2;
}
void service_telnet(char *ip, int32_t sp, unsigned char options, char *miscptr, FILE *fp, int32_t port, char *hostname) {
int32_t run = 1, next_run = 1, sock = -1, fck;
int32_t myport = PORT_TELNET, mysslport = PORT_TELNET_SSL;
hydra_register_socket(sp);
if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
return;
if (miscptr != NULL)
make_to_lower(miscptr);
while (1) {
int32_t first = 0;
int32_t old_waittime = waittime;
switch (run) {
case 1: /* connect and service init function */
if (sock >= 0)
sock = hydra_disconnect(sock);
// usleepn(300);
no_line_mode = 0;
first = 0;
if ((options & OPTION_SSL) == 0) {
if (port != 0)
myport = port;
sock = hydra_connect_tcp(ip, myport);
port = myport;
} else {
if (port != 0)
mysslport = port;
sock = hydra_connect_ssl(ip, mysslport, hostname);
port = mysslport;
}
if (sock < 0) {
hydra_report(stderr, "[ERROR] Child with pid %d terminating, can not connect\n", (int32_t)getpid());
hydra_child_exit(1);
}
if ((buf = hydra_receive_line(sock)) == NULL) { /* check the first line */
hydra_report(stderr, "[ERROR] Not a TELNET protocol or service shutdown\n");
hydra_child_exit(2);
// hydra_child_exit(2);
}
if (hydra_strcasestr(buf, "ress ENTER") != NULL) {
hydra_send(sock, "\r\n", 2, 0);
free(buf);
if ((buf = hydra_receive_line(sock)) == NULL) {
hydra_report(stderr, "[ERROR] Not a TELNET protocol or service shutdown\n");
hydra_child_exit(2);
}
}
if (hydra_strcasestr(buf, "login") != NULL || hydra_strcasestr(buf, "sername:") != NULL) {
waittime = 6;
if (debug)
hydra_report(stdout, "DEBUG: waittime set to %d\n", waittime);
}
do {
unsigned char *buf2 = (unsigned char *)buf;
while (*buf2 == IAC) {
if (first == 0) {
if (debug)
hydra_report(stdout, "DEBUG: requested line mode\n");
fck = write(sock, "\xff\xfb\x22", 3);
first = 1;
}
if ((buf[1] == '\xfc' || buf[1] == '\xfe') && buf2[2] == '\x22') {
no_line_mode = 1;
if (debug)
hydra_report(stdout, "DEBUG: TELNETD peer does not like linemode!\n");
}
if (buf2[2] != '\x22') {
if (buf2[1] == WILL || buf2[1] == WONT) {
buf2[1] = DONT;
} else if (buf2[1] == DO || buf2[1] == DONT) {
buf2[1] = WONT;
}
fck = write(sock, buf2, 3);
}
buf2 = buf2 + 3;
}
if (buf2 != (unsigned char *)buf) {
free(buf);
buf = hydra_receive_line(sock);
} else {
buf[0] = 0;
}
if (buf != NULL && buf[0] != 0 && (unsigned char)buf[0] != IAC)
make_to_lower(buf);
} while (buf != NULL && (unsigned char)buf[0] == IAC && hydra_strcasestr(buf, "ogin:") == NULL && hydra_strcasestr(buf, "sername:") == NULL);
free(buf);
waittime = old_waittime;
next_run = 2;
break;
case 2: /* run the cracking function */
next_run = start_telnet(sock, ip, port, options, miscptr, fp);
break;
case 3: /* clean exit */
if (sock >= 0)
sock = hydra_disconnect(sock);
hydra_child_exit(0);
return;
default:
hydra_report(stderr, "[ERROR] Caught unknown return code, exiting!\n");
hydra_child_exit(0);
}
run = next_run;
}
}
int32_t service_telnet_init(char *ip, int32_t sp, unsigned char options, char *miscptr, FILE *fp, int32_t port, char *hostname) {
// called before the childrens are forked off, so this is the function
// which should be filled if initial connections and service setup has to be
// performed once only.
//
// fill if needed.
//
// return codes:
// 0 all OK
// -1 error, hydra will exit, so print a good error message here
return 0;
}
void usage_telnet(const char *service) {
printf("Module telnet is optionally taking the string which is displayed after\n"
"a successful login (case insensitive), use if the default in the "
"telnet\n"
"module produces too many false positives\n\n");
}
