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284 lines
15 KiB
C++
284 lines
15 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) 1996-2019 Insecure.Com LLC ("The Nmap *
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* Project"). Nmap is also a registered trademark of the Nmap Project. *
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* This program is free software; you may redistribute and/or modify it *
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* under the terms of the GNU General Public License as published by the *
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* Free Software Foundation; Version 2 ("GPL"), BUT ONLY WITH ALL OF THE *
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* CLARIFICATIONS AND EXCEPTIONS DESCRIBED HEREIN. This guarantees your *
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* right to use, modify, and redistribute this software under certain *
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* conditions. If you wish to embed Nmap technology into proprietary *
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* software, we sell alternative licenses (contact sales@nmap.com). *
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* Dozens of software vendors already license Nmap technology such as *
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* host discovery, port scanning, OS detection, version detection, and *
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* the Nmap Scripting Engine. *
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* *
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* Note that the GPL places important restrictions on "derivative works", *
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* yet it does not provide a detailed definition of that term. To avoid *
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* misunderstandings, we interpret that term as broadly as copyright law *
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* allows. For example, we consider an application to constitute a *
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* derivative work for the purpose of this license if it does any of the *
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* following with any software or content covered by this license *
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* ("Covered Software"): *
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* *
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* o Integrates source code from Covered Software. *
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* *
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* o Reads or includes copyrighted data files, such as Nmap's nmap-os-db *
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* or nmap-service-probes. *
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* *
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* o Is designed specifically to execute Covered Software and parse the *
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* results (as opposed to typical shell or execution-menu apps, which will *
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* execute anything you tell them to). *
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* *
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* o Includes Covered Software in a proprietary executable installer. The *
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* installers produced by InstallShield are an example of this. Including *
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* Nmap with other software in compressed or archival form does not *
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* trigger this provision, provided appropriate open source decompression *
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* or de-archiving software is widely available for no charge. For the *
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* purposes of this license, an installer is considered to include Covered *
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* Software even if it actually retrieves a copy of Covered Software from *
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* another source during runtime (such as by downloading it from the *
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* Internet). *
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* *
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* o Links (statically or dynamically) to a library which does any of the *
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* above. *
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* *
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* o Executes a helper program, module, or script to do any of the above. *
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* *
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* This list is not exclusive, but is meant to clarify our interpretation *
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* of derived works with some common examples. Other people may interpret *
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* the plain GPL differently, so we consider this a special exception to *
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* the GPL that we apply to Covered Software. Works which meet any of *
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* these conditions must conform to all of the terms of this license, *
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* particularly including the GPL Section 3 requirements of providing *
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* source code and allowing free redistribution of the work as a whole. *
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* *
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* As another special exception to the GPL terms, the Nmap Project grants *
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* permission to link the code of this program with any version of the *
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* OpenSSL library which is distributed under a license identical to that *
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* listed in the included docs/licenses/OpenSSL.txt file, and distribute *
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* linked combinations including the two. *
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* *
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* The Nmap Project has permission to redistribute Npcap, a packet *
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* capturing driver and library for the Microsoft Windows platform. *
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* Npcap is a separate work with it's own license rather than this Nmap *
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* license. Since the Npcap license does not permit redistribution *
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* without special permission, our Nmap Windows binary packages which *
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* contain Npcap may not be redistributed without special permission. *
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* *
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* Any redistribution of Covered Software, including any derived works, *
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* must obey and carry forward all of the terms of this license, including *
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* obeying all GPL rules and restrictions. For example, source code of *
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* the whole work must be provided and free redistribution must be *
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* allowed. All GPL references to "this License", are to be treated as *
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* including the terms and conditions of this license text as well. *
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* *
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* Because this license imposes special exceptions to the GPL, Covered *
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* Work may not be combined (even as part of a larger work) with plain GPL *
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* software. The terms, conditions, and exceptions of this license must *
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* be included as well. This license is incompatible with some other open *
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* source licenses as well. In some cases we can relicense portions of *
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* Nmap or grant special permissions to use it in other open source *
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* software. Please contact fyodor@nmap.org with any such requests. *
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* Similarly, we don't incorporate incompatible open source software into *
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* Covered Software without special permission from the copyright holders. *
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* *
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* If you have any questions about the licensing restrictions on using *
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* Nmap in other works, we are happy to help. As mentioned above, we also *
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* offer an alternative license to integrate Nmap into proprietary *
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* applications and appliances. These contracts have been sold to dozens *
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* of software vendors, and generally include a perpetual license as well *
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* as providing support and updates. They also fund the continued *
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* development of Nmap. Please email sales@nmap.com for further *
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* information. *
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* *
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* If you have received a written license agreement or contract for *
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* Covered Software stating terms other than these, you may choose to use *
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* and redistribute Covered Software under those terms instead of these. *
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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, *
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* and add new features. You are highly encouraged to send your changes *
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* to the dev@nmap.org mailing list for possible incorporation into the *
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* main distribution. By sending these changes to Fyodor or one of the *
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* Insecure.Org development mailing lists, or checking them into the Nmap *
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* source code repository, it is understood (unless you specify *
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* otherwise) that you are offering the Nmap Project the unlimited, *
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* non-exclusive right to reuse, modify, and relicense the code. Nmap *
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* will always be available Open Source, but this is important because *
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* the inability to relicense code has caused devastating problems for *
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* other Free Software projects (such as KDE and NASM). We also *
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* occasionally relicense the code to third parties as discussed above. *
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* If you wish to specify special license conditions of your *
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* contributions, just say so when you send them. *
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* *
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* This program is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the Nmap *
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* license file for more details (it's in a COPYING file included with *
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* Nmap, and also available from https://svn.nmap.org/nmap/COPYING) *
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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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