mirror of
https://github.com/nmap/nmap.git
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215 lines
8.6 KiB
C++
215 lines
8.6 KiB
C++
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/***************************************************************************
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* NEPContext.cc -- *
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* *
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***********************IMPORTANT NMAP LICENSE TERMS************************
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*
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* The Nmap Security Scanner is (C) 1996-2025 Nmap Software LLC ("The Nmap
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* Project"). Nmap is also a registered trademark of the Nmap Project.
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*
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* This program is distributed under the terms of the Nmap Public Source
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* License (NPSL). The exact license text applying to a particular Nmap
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* release or source code control revision is contained in the LICENSE
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* file distributed with that version of Nmap or source code control
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* revision. More Nmap copyright/legal information is available from
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* https://nmap.org/book/man-legal.html, and further information on the
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* NPSL license itself can be found at https://nmap.org/npsl/ . This
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* header summarizes some key points from the Nmap license, but is no
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* substitute for the actual license text.
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*
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* Nmap is generally free for end users to download and use themselves,
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* including commercial use. It is available from https://nmap.org.
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*
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* The Nmap license generally prohibits companies from using and
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* redistributing Nmap in commercial products, but we sell a special Nmap
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* OEM Edition with a more permissive license and special features for
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* this purpose. See https://nmap.org/oem/
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*
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* If you have received a written Nmap license agreement or contract
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* stating terms other than these (such as an Nmap OEM license), you may
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* choose to use and redistribute Nmap under those terms instead.
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*
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* The official Nmap Windows builds include the Npcap software
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* (https://npcap.com) for packet capture and transmission. It is under
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* separate license terms which forbid redistribution without special
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* permission. So the official Nmap Windows builds may not be redistributed
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* without special permission (such as an Nmap OEM license).
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*
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* Source is provided to this software because we believe users have a
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* right to know exactly what a program is going to do before they run it.
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* This also allows you to audit the software for security holes.
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*
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* Source code also allows you to port Nmap to new platforms, fix bugs, and
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* add new features. You are highly encouraged to submit your changes as a
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* Github PR or by email to the dev@nmap.org mailing list for possible
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* incorporation into the main distribution. Unless you specify otherwise, it
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* is understood that you are offering us very broad rights to use your
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* submissions as described in the Nmap Public Source License Contributor
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* Agreement. This is important because we fund the project by selling licenses
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* with various terms, and also because the inability to relicense code has
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* caused devastating problems for other Free Software projects (such as KDE
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* and NASM).
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*
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* The free version of Nmap is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Warranties,
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* indemnification and commercial support are all available through the
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* Npcap OEM program--see https://nmap.org/oem/
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*
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***************************************************************************/
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#ifndef __NEPCONTEXT_H__
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#define __NEPCONTEXT_H__ 1
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#include "nsock.h"
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#include "EchoHeader.h"
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#include <vector>
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/* SERVER STATE MACHINE */
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/* _ */
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/* (O) */
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/* | */
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/* Capture Raw / | Rcvd TCP Connection / */
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/* Send NEP_ECHO | +--------+ Send NEP_HANDSHAKE_SERVER */
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/* +----------+ +---->| LISTEN |-----------------+ */
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/* | | +--------+ | */
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/* | \|/ \|/ */
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/* | +----+------+ +----------+-----------+ */
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/* +-----| NEP_READY | | NEP_HANDSHAKE_SERVER | */
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/* | SENT | | SENT | */
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/* +----+------+ +----------+-----------+ */
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/* /|\ | */
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/* | | */
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/* | +---------------------+ | */
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/* | | NEP_HANDSHAKE_FINAL | | */
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/* +-------| SENT |<---------+ */
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/* +---------------------+ Rcvd NEP_HANDSHAKE_CLIENT/ */
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/* Rcvd NEP_PACKETSPEC / Send NEP_HANDSHAKE_FINAL */
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/* Send NEP_READY */
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/* */
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/* */
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#define STATE_LISTEN 0x00
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#define STATE_HS_SERVER_SENT 0x01
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#define STATE_HS_FINAL_SENT 0x02
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#define STATE_READY_SENT 0x03
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#define CLIENT_NOT_FOUND -1
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typedef int clientid_t; /**< Type for client identifiers */
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#define MAC_KEY_S2C_INITIAL 0x01
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#define MAC_KEY_S2C 0x02
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#define MAC_KEY_C2S 0x03
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#define CIPHER_KEY_C2S 0x04
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#define CIPHER_KEY_S2C 0x05
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/* Client field specifier */
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typedef struct field_spec{
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u8 field; /* Field identifier (See NEP RFC) */
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u8 len; /* Field length */
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u8 value[PACKETSPEC_FIELD_LEN]; /* Field data */
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}fspec_t;
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class NEPContext {
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private:
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clientid_t id; /**< Client identifier */
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nsock_iod nsi; /**< Client nsock IOD */
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int state;
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u32 last_seq_client;
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u32 last_seq_server;
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u8 next_iv_enc[CIPHER_BLOCK_SIZE];
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u8 next_iv_dec[CIPHER_BLOCK_SIZE];
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u8 nep_key_mac_c2s[MAC_KEY_LEN];
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u8 nep_key_mac_s2c[MAC_KEY_LEN];
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u8 nep_key_ciphertext_c2s[CIPHER_KEY_LEN];
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u8 nep_key_ciphertext_s2c[CIPHER_KEY_LEN];
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u8 server_nonce[NONCE_LEN];
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u8 client_nonce[NONCE_LEN];
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bool server_nonce_set;
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bool client_nonce_set;
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std::vector<fspec_t> fspecs;
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struct sockaddr_storage clnt_addr;
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u8 *generateKey(int key_type, size_t *final_len);
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public:
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NEPContext();
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~NEPContext();
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void reset();
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int setIdentifier(clientid_t clnt);
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clientid_t getIdentifier();
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int setAddress(const struct sockaddr_storage &a);
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struct sockaddr_storage getAddress();
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int setNsockIOD(nsock_iod iod);
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nsock_iod getNsockIOD();
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int setState(int state);
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int getState();
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bool ready();
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int setNextEncryptionIV(u8 *block);
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u8 *getNextEncryptionIV(size_t *final_len);
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u8 *getNextEncryptionIV();
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int setNextDecryptionIV(u8 *block);
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u8 *getNextDecryptionIV(size_t *final_len);
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u8 *getNextDecryptionIV();
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int setLastServerSequence(u32 seq);
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u32 getLastServerSequence();
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u32 getNextServerSequence();
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int setLastClientSequence(u32 seq);
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u32 getLastClientSequence();
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u32 getNextClientSequence();
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int generateInitialServerSequence();
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int generateInitialClientSequence();
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int setMacKeyC2S(u8 *key);
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u8 *getMacKeyC2S();
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u8 *getMacKeyC2S(size_t *final_len);
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int generateMacKeyC2S();
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int setMacKeyS2C(u8 *key);
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u8 *getMacKeyS2C();
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u8 *getMacKeyS2C(size_t *final_len);
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int generateMacKeyS2C();
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int setCipherKeyC2S(u8 *key);
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u8 *getCipherKeyC2S();
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u8 *getCipherKeyC2S(size_t *final_len);
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int generateCipherKeyC2S();
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int generateMacKeyS2CInitial();
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int setCipherKeyS2C(u8 *key);
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u8 *getCipherKeyS2C();
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u8 *getCipherKeyS2C(size_t *final_len);
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int generateCipherKeyS2C();
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int generateClientNonce();
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int generateServerNonce();
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int setClientNonce(u8 *buff);
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u8 *getClientNonce();
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int setServerNonce(u8 *buff);
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u8 *getServerNonce();
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int addClientFieldSpec(u8 field, u8 len, u8 *value);
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fspec_t *getClientFieldSpec(int index);
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bool isDuplicateFieldSpec(u8 test_field);
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int resetClientFieldSpecs();
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};
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#endif /* __NEPCONTEXT_H__ */
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