forked from vanhauser-thc/thc-hydra
/
hydra-smtp.c
450 lines (397 loc) · 13.1 KB
/
hydra-smtp.c
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#include "hydra-mod.h"
#include "sasl.h"
extern char *HYDRA_EXIT;
int smtp_auth_mechanism = AUTH_LOGIN;
char *smtp_read_server_capacity(int sock) {
char *ptr = NULL;
int resp = 0;
char *buf = NULL;
do {
if (buf != NULL)
free(buf);
ptr = buf = hydra_receive_line(sock);
if (buf != NULL) {
if (isdigit((int) buf[0]) && buf[3] == ' ')
resp = 1;
else {
if (buf[strlen(buf) - 1] == '\n')
buf[strlen(buf) - 1] = 0;
if (buf[strlen(buf) - 1] == '\r')
buf[strlen(buf) - 1] = 0;
#ifdef NO_RINDEX
if ((ptr = strrchr(buf, '\n')) != NULL) {
#else
if ((ptr = rindex(buf, '\n')) != NULL) {
#endif
ptr++;
if (isdigit((int) *ptr) && *(ptr + 3) == ' ')
resp = 1;
}
}
}
} while (buf != NULL && resp == 0);
return buf;
}
int start_smtp(int s, char *ip, int port, unsigned char options, char *miscptr, FILE * fp) {
char *empty = "";
char *login, *pass, buffer[500], buffer2[500], *fooptr, *buf;
if (strlen(login = hydra_get_next_login()) == 0)
login = empty;
if (strlen(pass = hydra_get_next_password()) == 0)
pass = empty;
while (hydra_data_ready(s) > 0) {
if ((buf = hydra_receive_line(s)) == NULL)
return (1);
free(buf);
}
switch (smtp_auth_mechanism) {
case AUTH_PLAIN:
sprintf(buffer, "AUTH PLAIN\r\n");
if (hydra_send(s, buffer, strlen(buffer), 0) < 0) {
return 1;
}
if ((buf = hydra_receive_line(s)) == NULL)
return 1;
if (strstr(buf, "334") == NULL) {
hydra_report(stderr, "[ERROR] SMTP PLAIN AUTH : %s\n", buf);
free(buf);
return 3;
}
free(buf);
memset(buffer, 0, sizeof(buffer));
sasl_plain(buffer, login, pass);
sprintf(buffer, "%.250s\r\n", buffer);
break;
#ifdef LIBOPENSSL
case AUTH_CRAMMD5:{
int rc = 0;
char *preplogin;
rc = sasl_saslprep(login, SASL_ALLOW_UNASSIGNED, &preplogin);
if (rc) {
return 3;
}
sprintf(buffer, "AUTH CRAM-MD5\r\n");
if (hydra_send(s, buffer, strlen(buffer), 0) < 0) {
return 1;
}
//get the one-time BASE64 encoded challenge
if ((buf = hydra_receive_line(s)) == NULL)
return 1;
if (strstr(buf, "334") == NULL || strlen(buf) < 8) {
hydra_report(stderr, "[ERROR] SMTP CRAM-MD5 AUTH : %s\n", buf);
free(buf);
return 3;
}
memset(buffer, 0, sizeof(buffer));
from64tobits((char *) buffer, buf + 4);
free(buf);
memset(buffer2, 0, sizeof(buffer2));
sasl_cram_md5(buffer2, pass, buffer);
sprintf(buffer, "%s %.250s", preplogin, buffer2);
hydra_tobase64((unsigned char *) buffer, strlen(buffer), sizeof(buffer));
sprintf(buffer, "%.250s\r\n", buffer);
free(preplogin);
}
break;
case AUTH_DIGESTMD5:{
sprintf(buffer, "AUTH DIGEST-MD5\r\n");
if (hydra_send(s, buffer, strlen(buffer), 0) < 0)
return 1;
//receive
if ((buf = hydra_receive_line(s)) == NULL)
return 1;
if (strstr(buf, "334") == NULL) {
hydra_report(stderr, "[ERROR] SMTP DIGEST-MD5 AUTH : %s\n", buf);
free(buf);
return 3;
}
memset(buffer, 0, sizeof(buffer));
from64tobits((char *) buffer, buf + 4);
free(buf);
if (debug)
hydra_report(stderr, "DEBUG S: %s\n", buffer);
fooptr = buffer2;
sasl_digest_md5(fooptr, login, pass, buffer, miscptr, "smtp", NULL, 0, NULL);
if (fooptr == NULL)
return 3;
if (debug)
hydra_report(stderr, "DEBUG C: %s\n", buffer2);
hydra_tobase64((unsigned char *) buffer2, strlen(buffer2), sizeof(buffer2));
sprintf(buffer, "%s\r\n", buffer2);
}
break;
#endif
case AUTH_NTLM:{
unsigned char buf1[4096];
unsigned char buf2[4096];
//send auth and receive challenge
buildAuthRequest((tSmbNtlmAuthRequest *) buf2, 0, NULL, NULL);
to64frombits(buf1, buf2, SmbLength((tSmbNtlmAuthRequest *) buf2));
sprintf(buffer, "AUTH NTLM %s\r\n", buf1);
if (hydra_send(s, buffer, strlen(buffer), 0) < 0) {
return 1;
}
if ((buf = hydra_receive_line(s)) == NULL)
return 1;
if (strstr(buf, "334") == NULL || strlen(buf) < 8) {
hydra_report(stderr, "[ERROR] SMTP NTLM AUTH : %s\n", buf);
free(buf);
return 3;
}
//recover challenge
from64tobits((char *) buf1, buf + 4);
free(buf);
buildAuthResponse((tSmbNtlmAuthChallenge *) buf1, (tSmbNtlmAuthResponse *) buf2, 0, login, pass, NULL, NULL);
to64frombits(buf1, buf2, SmbLength((tSmbNtlmAuthResponse *) buf2));
sprintf(buffer, "%s\r\n", buf1);
}
break;
default:
/* by default trying AUTH LOGIN */
sprintf(buffer, "AUTH LOGIN\r\n");
if (hydra_send(s, buffer, strlen(buffer), 0) < 0) {
return 1;
}
if ((buf = hydra_receive_line(s)) == NULL)
return 1;
/* 504 5.7.4 Unrecognized authentication type */
if (strstr(buf, "334") == NULL) {
hydra_report(stderr, "[ERROR] SMTP LOGIN AUTH, either this auth is disabled\nor server is not using auth: %s\n", buf);
free(buf);
return 3;
}
free(buf);
sprintf(buffer2, "%.250s", login);
hydra_tobase64((unsigned char *) buffer2, strlen(buffer2), sizeof(buffer2));
sprintf(buffer, "%.250s\r\n", buffer2);
if (hydra_send(s, buffer, strlen(buffer), 0) < 0) {
return 1;
}
if ((buf = hydra_receive_line(s)) == NULL)
return (1);
if (strstr(buf, "334") == NULL) {
hydra_report(stderr, "[ERROR] SMTP LOGIN AUTH : %s\n", buf);
free(buf);
return (3);
}
free(buf);
sprintf(buffer2, "%.250s", pass);
hydra_tobase64((unsigned char *) buffer2, strlen(buffer2), sizeof(buffer2));
sprintf(buffer, "%.250s\r\n", buffer2);
}
if (hydra_send(s, buffer, strlen(buffer), 0) < 0) {
return 1;
}
if ((buf = hydra_receive_line(s)) == NULL)
return (1);
#ifdef LIBOPENSSL
if (smtp_auth_mechanism == AUTH_DIGESTMD5) {
if (strstr(buf, "334") != NULL && strlen(buf) >= 8) {
memset(buffer2, 0, sizeof(buffer2));
from64tobits((char *) buffer2, buf + 4);
if (strstr(buffer2, "rspauth=") != NULL) {
hydra_report_found_host(port, ip, "smtp", fp);
hydra_completed_pair_found();
free(buf);
if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
return 3;
return 1;
}
}
} else
#endif
{
if (strstr(buf, "235") != NULL) {
hydra_report_found_host(port, ip, "smtp", 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_smtp(char *ip, int sp, unsigned char options, char *miscptr, FILE * fp, int port) {
int run = 1, next_run = 1, sock = -1, i = 0;
int myport = PORT_SMTP, mysslport = PORT_SMTP_SSL, disable_tls = 1;
char *buf;
char *buffer1 = "EHLO hydra\r\n";
char *buffer2 = "HELO hydra\r\n";
hydra_register_socket(sp);
if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
return;
while (1) {
switch (run) {
case 1: /* connect and service init function */
if (sock >= 0)
sock = hydra_disconnect(sock);
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);
port = mysslport;
}
if (sock < 0) {
if (verbose || debug)
hydra_report(stderr, "[ERROR] Child with pid %d terminating, can not connect\n", (int) getpid());
hydra_child_exit(1);
}
/* receive initial header */
if ((buf = hydra_receive_line(sock)) == NULL)
hydra_child_exit(2);
if (strstr(buf, "220") == NULL) {
hydra_report(stderr, "[WARNING] SMTP does not allow to connect: %s\n", buf);
free(buf);
hydra_child_exit(2);
}
while (strstr(buf, "220 ") == NULL) {
free(buf);
buf = hydra_receive_line(sock);
}
free(buf);
/* send ehlo and receive/ignore reply */
if (hydra_send(sock, buffer1, strlen(buffer1), 0) < 0)
hydra_child_exit(2);
buf = smtp_read_server_capacity(sock);
if (buf == NULL)
hydra_child_exit(2);
if ((miscptr != NULL) && (strlen(miscptr) > 0)) {
for (i = 0; i < strlen(miscptr); i++)
miscptr[i] = (char) toupper((int) miscptr[i]);
if (strstr(miscptr, "TLS") || strstr(miscptr, "SSL")) {
disable_tls = 0;
}
}
#ifdef LIBOPENSSL
if (!disable_tls) {
/* if we got a positive answer */
if (buf[0] == '2') {
if (strstr(buf, "STARTTLS") != NULL) {
hydra_send(sock, "STARTTLS\r\n", strlen("STARTTLS\r\n"), 0);
free(buf);
buf = hydra_receive_line(sock);
if (buf[0] != '2') {
hydra_report(stderr, "[ERROR] TLS negotiation failed, no answer received from STARTTLS request\n");
} else {
free(buf);
if ((hydra_connect_to_ssl(sock) == -1)) {
if (verbose)
hydra_report(stderr, "[ERROR] Can't use TLS\n");
disable_tls = 1;
run = 1;
break;
} else {
if (verbose)
hydra_report(stderr, "[VERBOSE] TLS connection done\n");
}
/* ask again capability request but in TLS mode */
if (hydra_send(sock, buffer1, strlen(buffer1), 0) < 0)
hydra_child_exit(2);
buf = smtp_read_server_capacity(sock);
if (buf == NULL)
hydra_child_exit(2);
}
} else
hydra_report(stderr, "[ERROR] option to use TLS/SSL failed as it is not supported by the server\n");
} else
hydra_report(stderr, "[ERROR] option to use TLS/SSL failed as it is not supported by the server\n");
}
#endif
if (buf[0] != '2') {
if (hydra_send(sock, buffer2, strlen(buffer2), 0) < 0)
hydra_child_exit(2);
free(buf);
buf = smtp_read_server_capacity(sock);
if (buf == NULL)
hydra_child_exit(2);
}
if ((strstr(buf, "LOGIN") == NULL) && (strstr(buf, "NTLM") != NULL)) {
smtp_auth_mechanism = AUTH_NTLM;
}
#ifdef LIBOPENSSL
if ((strstr(buf, "LOGIN") == NULL) && (strstr(buf, "DIGEST-MD5") != NULL)) {
smtp_auth_mechanism = AUTH_DIGESTMD5;
}
if ((strstr(buf, "LOGIN") == NULL) && (strstr(buf, "CRAM-MD5") != NULL)) {
smtp_auth_mechanism = AUTH_CRAMMD5;
}
#endif
if ((strstr(buf, "LOGIN") == NULL) && (strstr(buf, "PLAIN") != NULL)) {
smtp_auth_mechanism = AUTH_PLAIN;
}
if ((miscptr != NULL) && (strlen(miscptr) > 0)) {
if (strstr(miscptr, "LOGIN"))
smtp_auth_mechanism = AUTH_LOGIN;
if (strstr(miscptr, "PLAIN"))
smtp_auth_mechanism = AUTH_PLAIN;
#ifdef LIBOPENSSL
if (strstr(miscptr, "CRAM-MD5"))
smtp_auth_mechanism = AUTH_CRAMMD5;
if (strstr(miscptr, "DIGEST-MD5"))
smtp_auth_mechanism = AUTH_DIGESTMD5;
#endif
if (strstr(miscptr, "NTLM"))
smtp_auth_mechanism = AUTH_NTLM;
}
if (verbose) {
switch (smtp_auth_mechanism) {
case AUTH_LOGIN:
hydra_report(stderr, "[VERBOSE] using SMTP LOGIN AUTH mechanism\n");
break;
case AUTH_PLAIN:
hydra_report(stderr, "[VERBOSE] using SMTP PLAIN AUTH mechanism\n");
break;
#ifdef LIBOPENSSL
case AUTH_CRAMMD5:
hydra_report(stderr, "[VERBOSE] using SMTP CRAM-MD5 AUTH mechanism\n");
break;
case AUTH_DIGESTMD5:
hydra_report(stderr, "[VERBOSE] using SMTP DIGEST-MD5 AUTH mechanism\n");
break;
#endif
case AUTH_NTLM:
hydra_report(stderr, "[VERBOSE] using SMTP NTLM AUTH mechanism\n");
break;
}
}
free(buf);
next_run = 2;
break;
case 2: /* run the cracking function */
next_run = start_smtp(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;
}
}
int service_smtp_init(char *ip, int sp, unsigned char options, char *miscptr, FILE * fp, int port) {
// 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;
}