/*************************************************************************** * NEPContext.cc -- * * * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2022 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 /* 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 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__ */