A man-in-the-middle attack script by ARP spoofing.
//TODO add SIGTERM handler
Clone repository:
git clone https://NATHAN76543217/ft_malcom.git && cd ft_malcolm/ && git submodule init && git submodule update
Run the command make.
Usage: ./ft_malcolm src_ip src_mac_address target_ip target_mac_address
Usage:
./ft_malcolm [options] [--] source_ip source_mac dest_ip
./ft_malcolm [options] [--] source_ip source_mac target_ip target_mac
ARP spoofing (poisoning) program.
-h, --help show this help message and exit
Basic options
-v, --verbose enable verbose mode.
-r, --reverse enable verbose mode.
-i, --interface=<str> force to use a specific interface.
The Address Resolution Protocol (ARP) is a request-response process by which a known IP address is mapped to an unknow MAC address.
In a Linux system, arp cache is accessible into /proc/net/arp (stored in RAM).
An ARP message is always related to only one (1) address resolution.
The size of the ARP message depends on the link layer and network layer address sizes. For IPv4 it's 28 bytes.
Two query:
- Request:
- Reply:
The message header specifies the types of network in use at each layer as well as the size of addresses of each.
The message header is completed with the operation code for request (1) and reply (2).
The payload of the packset consists of four addresses, the hardware and protocol address of the sender and receiver hosts.
/*
* This structure defines an ethernet header.
*/
typedef struct __attribute__((packed)) ether_header {
uint8_t ether_dhost[ETHER_ADDR_LEN];
uint8_t ether_shost[ETHER_ADDR_LEN];
uint16_t ether_type;
} ETHERHDR;
/*
* This structure defines an ethernet arp header.
*/
struct arpPacket {
__be16 ar_hrd; /* format of hardware address */
__be16 ar_pro; /* format of protocol address */
unsigned char ar_hln; /* length of hardware address */
unsigned char ar_pln; /* length of protocol address */
__be16 ar_op; /* ARP operation code (1 | 2) */
unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
unsigned char ar_sip[4]; /* sender IP address */
unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
unsigned char ar_tip[4]; /* target IP address */
};
- Htype 2 byte
- Ptype 2 byte
for IPv4 the value is :`0x0800`
- Hlen 1 byte
- Plen 1 byte
- Operation 2 byte
The value is either 1 for a request or 2 for a reply.
Total: 10 bytes
- SHA 6 bytes
- SPA 4 bytes
Total: 10 bytes
- THA 6 bytes
- TPA 4 bytes
Congif:
- PC A
- PC B
- PC C
Detect arp request on an interface
then
send an ARP reply to Target saying we are src => now target think we are SRC
send an ARP reply to SRC saying we are Target => now SRC think we are Target
IP: 192.168.1.98 this IP boadcast: 192.168.1.255 standard IP boadcast: 255.255.255.255 MAC broadcast: FF:FF:FF:FF:FF:FF Avant: A et B communique Après: A envoie à B(C) et C transmet à B(B). Je dois envoyer une reply normalement.
- compile argparse in Makefile
- link lib
- add option (-v, -i, -t , -p, etc...)
https://en.wikipedia.org/wiki/Address_Resolution_Protocol https://stackoverflow.com/questions/12515005/receiving-udp-broadcast https://stackoverflow.com/questions/1955198/when-is-ipproto-udp-required https://github.com/cofyc/argparse https://stackoverflow.com/questions/21721145/how-to-send-a-raw-ethernet-frame-using-the-netbsd-stack https://sock-raw.org/papers/sock_raw https://gh0std3v.github.io/posts/2020/11/getting-a-mac-address-on-a-mac/ https://tuprints.ulb.tu-darmstadt.de/6243/1/TR-18.pdf https://jnc0x24dd099bb870.github.io/Network/ARP/ARP2/index.html https://www.freebsd.org/cgi/man.cgi?query=bpf&sektion=4&manpath=FreeBSD+4.7-RELEASE https://circle-networks.com/resources?lang=en&doc=bl200076p https://www.freebsd.org/cgi/man.cgi?query=bpf&sektion=4&manpath=FreeBSD+7.1-RELEASE Debian shortcut https://nui.fr/obsolescence-de-net-tools-ifconfig-ping/ https://security.stackexchange.com/questions/133784/does-arp-spoofing-work-on-all-lans
https://security.stackexchange.com/questions/41961/arp-poisoning-between-a-wired-and-wireless-network https://stackoverflow.com/questions/16710040/arp-request-and-reply-using-c-socket-programming
The ARP Cache Poisoningsection of this link is very interesting, it report some behaviors that I encountered myself. Pour ma part j'ai réussi à faire accepter des paquets et à maintenir le spoof en place en renvoyant régulierement des paquets ARP REPLY à la target:
https://www.utc.edu/sites/default/files/2021-04/course-paper-5620-attacktcpip.pdf
SO_BINDTODEVICE is deprecated since 1999. Use bind() with a struct sockaddr_ll instead
Enable IP forwarding:
mac: sysctl -w net.inet.ip.forwarding=1
linux: echo 1 > /proc/sys/net/ipv4/ip_forward
Broadcasting udp package: nc -ub broadcast_addr port on linux
https://www.vankuik.nl/2012-02-09_Writing_ethernet_packets_on_OS_X_and_BSD
https://man7.org/linux/man-pages/man7/packet.7.html
https://security.stackexchange.com/questions/197453/mitm-using-arp-spoofing-with-kali-linux-running-on-virtualbox-with-bridged-wifi
bpf0 is lo0 bpf1 is en0 bpf2 is en1 etc...
srp_ip = qui l'on veut usurpé src_mac = notre addresse MAC target_ip = ip de la personne que l'on veut spoof target_mac = mac de la personne que l'on veut spoof
donc depuis mon mac si je veut recevoir tout ce qu'envoie la VM au à la box: ./ft_malcolm box my_mac_addr VM_IP VM_MAC
When sending an ARP request: always fill the source_mac_address with address of the request's sender When sending an ARP request: always fill the source_ip_address with the IP of the sender When sending an ARP request: always fill the target_mac_address with 00:00:00:00:00:00 When sending an ARP request: always fill the target_ip_address with the IP to guess
When sending an ARP reply: fill the source_mac_address with the MAC address that was looking for (the response of the previous request) When sending an ARP reply: fill the source_ip_address with the IP of the sender When sending an ARP reply: always fill the target_mac_address with the address of the emitter of the request When sending an ARP reply: always fill the target_ip_address with the IP of the emitter of the request
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