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/***************************************************************************
* NEPContext.cc -- *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
*
* The Nmap Security Scanner is (C) 1996-2023 Nmap Software LLC ("The Nmap
* Project"). Nmap is also a registered trademark of the Nmap Project.
*
* This program is distributed under the terms of the Nmap Public Source
* License (NPSL). The exact license text applying to a particular Nmap
* release or source code control revision is contained in the LICENSE
* file distributed with that version of Nmap or source code control
* revision. More Nmap copyright/legal information is available from
* https://nmap.org/book/man-legal.html, and further information on the
* NPSL license itself can be found at https://nmap.org/npsl/ . This
* header summarizes some key points from the Nmap license, but is no
* substitute for the actual license text.
*
* Nmap is generally free for end users to download and use themselves,
* including commercial use. It is available from https://nmap.org.
*
* The Nmap license generally prohibits companies from using and
* redistributing Nmap in commercial products, but we sell a special Nmap
* OEM Edition with a more permissive license and special features for
* this purpose. See https://nmap.org/oem/
*
* If you have received a written Nmap license agreement or contract
* stating terms other than these (such as an Nmap OEM license), you may
* choose to use and redistribute Nmap under those terms instead.
*
* The official Nmap Windows builds include the Npcap software
* (https://npcap.com) for packet capture and transmission. It is under
* separate license terms which forbid redistribution without special
* permission. So the official Nmap Windows builds may not be redistributed
* without special permission (such as an Nmap OEM license).
*
* Source is provided to this software because we believe users have a
* right to know exactly what a program is going to do before they run it.
* This also allows you to audit the software for security holes.
*
* Source code also allows you to port Nmap to new platforms, fix bugs, and add
* new features. You are highly encouraged to submit your changes as a Github PR
* or by email to the dev@nmap.org mailing list for possible incorporation into
* the main distribution. Unless you specify otherwise, it is understood that
* you are offering us very broad rights to use your submissions as described in
* the Nmap Public Source License Contributor Agreement. This is important
* because we fund the project by selling licenses with various terms, and also
* because the inability to relicense code has caused devastating problems for
* other Free Software projects (such as KDE and NASM).
*
* The free version of Nmap is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Warranties,
* indemnification and commercial support are all available through the
* Npcap OEM program--see https://nmap.org/oem/
*
***************************************************************************/
#ifndef __NEPCONTEXT_H__
#define __NEPCONTEXT_H__ 1
#include "nsock.h"
#include "EchoHeader.h"
#include <vector>
/* SERVER STATE MACHINE */
/* _ */
/* (O) */
/* | */
/* Capture Raw / | Rcvd TCP Connection / */
/* Send NEP_ECHO | +--------+ Send NEP_HANDSHAKE_SERVER */
/* +----------+ +---->| LISTEN |-----------------+ */
/* | | +--------+ | */
/* | \|/ \|/ */
/* | +----+------+ +----------+-----------+ */
/* +-----| NEP_READY | | NEP_HANDSHAKE_SERVER | */
/* | SENT | | SENT | */
/* +----+------+ +----------+-----------+ */
/* /|\ | */
/* | | */
/* | +---------------------+ | */
/* | | NEP_HANDSHAKE_FINAL | | */
/* +-------| SENT |<---------+ */
/* +---------------------+ Rcvd NEP_HANDSHAKE_CLIENT/ */
/* Rcvd NEP_PACKETSPEC / Send NEP_HANDSHAKE_FINAL */
/* Send NEP_READY */
/* */
/* */
#define STATE_LISTEN 0x00
#define STATE_HS_SERVER_SENT 0x01
#define STATE_HS_FINAL_SENT 0x02
#define STATE_READY_SENT 0x03
#define CLIENT_NOT_FOUND -1
typedef int clientid_t; /**< Type for client identifiers */
#define MAC_KEY_S2C_INITIAL 0x01
#define MAC_KEY_S2C 0x02
#define MAC_KEY_C2S 0x03
#define CIPHER_KEY_C2S 0x04
#define CIPHER_KEY_S2C 0x05
/* Client field specifier */
typedef struct field_spec{
u8 field; /* Field identifier (See NEP RFC) */
u8 len; /* Field length */
u8 value[PACKETSPEC_FIELD_LEN]; /* Field data */
}fspec_t;
class NEPContext {
private:
clientid_t id; /**< Client identifier */
nsock_iod nsi; /**< Client nsock IOD */
int state;
u32 last_seq_client;
u32 last_seq_server;
u8 next_iv_enc[CIPHER_BLOCK_SIZE];
u8 next_iv_dec[CIPHER_BLOCK_SIZE];
u8 nep_key_mac_c2s[MAC_KEY_LEN];
u8 nep_key_mac_s2c[MAC_KEY_LEN];
u8 nep_key_ciphertext_c2s[CIPHER_KEY_LEN];
u8 nep_key_ciphertext_s2c[CIPHER_KEY_LEN];
u8 server_nonce[NONCE_LEN];
u8 client_nonce[NONCE_LEN];
bool server_nonce_set;
bool client_nonce_set;
std::vector<fspec_t> fspecs;
struct sockaddr_storage clnt_addr;
u8 *generateKey(int key_type, size_t *final_len);
public:
NEPContext();
~NEPContext();
void reset();
int setIdentifier(clientid_t clnt);
clientid_t getIdentifier();
int setAddress(const struct sockaddr_storage &a);
struct sockaddr_storage getAddress();
int setNsockIOD(nsock_iod iod);
nsock_iod getNsockIOD();
int setState(int state);
int getState();
bool ready();
int setNextEncryptionIV(u8 *block);
u8 *getNextEncryptionIV(size_t *final_len);
u8 *getNextEncryptionIV();
int setNextDecryptionIV(u8 *block);
u8 *getNextDecryptionIV(size_t *final_len);
u8 *getNextDecryptionIV();
int setLastServerSequence(u32 seq);
u32 getLastServerSequence();
u32 getNextServerSequence();
int setLastClientSequence(u32 seq);
u32 getLastClientSequence();
u32 getNextClientSequence();
int generateInitialServerSequence();
int generateInitialClientSequence();
int setMacKeyC2S(u8 *key);
u8 *getMacKeyC2S();
u8 *getMacKeyC2S(size_t *final_len);
int generateMacKeyC2S();
int setMacKeyS2C(u8 *key);
u8 *getMacKeyS2C();
u8 *getMacKeyS2C(size_t *final_len);
int generateMacKeyS2C();
int setCipherKeyC2S(u8 *key);
u8 *getCipherKeyC2S();
u8 *getCipherKeyC2S(size_t *final_len);
int generateCipherKeyC2S();
int generateMacKeyS2CInitial();
int setCipherKeyS2C(u8 *key);
u8 *getCipherKeyS2C();
u8 *getCipherKeyS2C(size_t *final_len);
int generateCipherKeyS2C();
int generateClientNonce();
int generateServerNonce();
int setClientNonce(u8 *buff);
u8 *getClientNonce();
int setServerNonce(u8 *buff);
u8 *getServerNonce();
int addClientFieldSpec(u8 field, u8 len, u8 *value);
fspec_t *getClientFieldSpec(int index);
bool isDuplicateFieldSpec(u8 test_field);
int resetClientFieldSpecs();
};
#endif /* __NEPCONTEXT_H__ */
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