/*************************************************************************** * NEPContext.cc -- * * * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2012 Insecure.Com LLC. Nmap is * * also a registered trademark of Insecure.Com LLC. This program is free * * software; you may redistribute and/or modify it under the terms of the * * GNU General Public License as published by the Free Software * * Foundation; Version 2 with the clarifications and exceptions described * * below. This guarantees your right to use, modify, and redistribute * * this software under certain conditions. If you wish to embed Nmap * * technology into proprietary software, we sell alternative licenses * * (contact sales@insecure.com). Dozens of software vendors already * * license Nmap technology such as host discovery, port scanning, OS * * detection, version detection, and the Nmap Scripting Engine. * * * * Note that the GPL places important restrictions on "derived works", yet * * it does not provide a detailed definition of that term. To avoid * * misunderstandings, we interpret that term as broadly as copyright law * * allows. For example, we consider an application to constitute a * * "derivative work" for the purpose of this license if it does any of the * * following: * * o Integrates source code from Nmap * * o Reads or includes Nmap copyrighted data files, such as * * nmap-os-db or nmap-service-probes. * * o Executes Nmap and parses the results (as opposed to typical shell or * * execution-menu apps, which simply display raw Nmap output and so are * * not derivative works.) * * o Integrates/includes/aggregates Nmap into a proprietary executable * * installer, such as those produced by InstallShield. * * o Links to a library or executes a program that does any of the above * * * * The term "Nmap" should be taken to also include any portions or derived * * works of Nmap, as well as other software we distribute under this * * license such as Zenmap, Ncat, and Nping. This list is not exclusive, * * but is meant to clarify our interpretation of derived works with some * * common examples. Our interpretation applies only to Nmap--we don't * * speak for other people's GPL works. * * * * If you have any questions about the GPL licensing restrictions on using * * Nmap in non-GPL works, we would be happy to help. As mentioned above, * * we also offer alternative license to integrate Nmap into proprietary * * applications and appliances. These contracts have been sold to dozens * * of software vendors, and generally include a perpetual license as well * * as providing for priority support and updates. They also fund the * * continued development of Nmap. Please email sales@insecure.com for * * further information. * * * * As a special exception to the GPL terms, Insecure.Com LLC grants * * permission to link the code of this program with any version of the * * OpenSSL library which is distributed under a license identical to that * * listed in the included docs/licenses/OpenSSL.txt file, and distribute * * linked combinations including the two. You must obey the GNU GPL in all * * respects for all of the code used other than OpenSSL. If you modify * * this file, you may extend this exception to your version of the file, * * but you are not obligated to do so. * * * * If you received these files with a written license agreement or * * contract stating terms other than the terms above, then that * * alternative license agreement takes precedence over these comments. * * * * 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 (none * * have been found so far). * * * * Source code also allows you to port Nmap to new platforms, fix bugs, * * and add new features. You are highly encouraged to send your changes * * to nmap-dev@insecure.org for possible incorporation into the main * * distribution. By sending these changes to Fyodor or one of the * * Insecure.Org development mailing lists, or checking them into the Nmap * * source code repository, it is understood (unless you specify otherwise) * * that you are offering the Nmap Project (Insecure.Com LLC) the * * unlimited, non-exclusive right to reuse, modify, and relicense the * * code. Nmap will always be available Open Source, but this is important * * because the inability to relicense code has caused devastating problems * * for other Free Software projects (such as KDE and NASM). We also * * occasionally relicense the code to third parties as discussed above. * * If you wish to specify special license conditions of your * * contributions, just say so when you send them. * * * * This program 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. See the GNU * * General Public License v2.0 for more details at * * http://www.gnu.org/licenses/gpl-2.0.html , or in the COPYING file * * included with Nmap. * * * ***************************************************************************/ #ifndef __NEPCONTEXT_H__ #define __NEPCONTEXT_H__ 1 #include "nsock.h" #include "EchoHeader.h" #include using namespace std; /* 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; 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(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__ */