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EchoHeader.h
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/***************************************************************************
* EchoHeader.h -- The EchoHeader Class represents packets of the Nping *
* Echo Protocol. It contains the appropriate methods to set/get all *
* header fields. In general these methods do error checking and perform *
* byte order conversions. *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
* *
* The Nmap Security Scanner is (C) 1996-2015 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 ("GPL"), BUT ONLY WITH ALL OF THE CLARIFICATIONS *
* AND EXCEPTIONS DESCRIBED HEREIN. 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@nmap.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 "derivative 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 with any software or content covered by this license *
* ("Covered Software"): *
* *
* o Integrates source code from Covered Software. *
* *
* o Reads or includes copyrighted data files, such as Nmap's nmap-os-db *
* or nmap-service-probes. *
* *
* o Is designed specifically to execute Covered Software and parse the *
* results (as opposed to typical shell or execution-menu apps, which will *
* execute anything you tell them to). *
* *
* o Includes Covered Software in a proprietary executable installer. The *
* installers produced by InstallShield are an example of this. Including *
* Nmap with other software in compressed or archival form does not *
* trigger this provision, provided appropriate open source decompression *
* or de-archiving software is widely available for no charge. For the *
* purposes of this license, an installer is considered to include Covered *
* Software even if it actually retrieves a copy of Covered Software from *
* another source during runtime (such as by downloading it from the *
* Internet). *
* *
* o Links (statically or dynamically) to a library which does any of the *
* above. *
* *
* o Executes a helper program, module, or script to do any of the above. *
* *
* This list is not exclusive, but is meant to clarify our interpretation *
* of derived works with some common examples. Other people may interpret *
* the plain GPL differently, so we consider this a special exception to *
* the GPL that we apply to Covered Software. Works which meet any of *
* these conditions must conform to all of the terms of this license, *
* particularly including the GPL Section 3 requirements of providing *
* source code and allowing free redistribution of the work as a whole. *
* *
* As another 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. *
* *
* Any redistribution of Covered Software, including any derived works, *
* must obey and carry forward all of the terms of this license, including *
* obeying all GPL rules and restrictions. For example, source code of *
* the whole work must be provided and free redistribution must be *
* allowed. All GPL references to "this License", are to be treated as *
* including the terms and conditions of this license text as well. *
* *
* Because this license imposes special exceptions to the GPL, Covered *
* Work may not be combined (even as part of a larger work) with plain GPL *
* software. The terms, conditions, and exceptions of this license must *
* be included as well. This license is incompatible with some other open *
* source licenses as well. In some cases we can relicense portions of *
* Nmap or grant special permissions to use it in other open source *
* software. Please contact fyodor@nmap.org with any such requests. *
* Similarly, we don't incorporate incompatible open source software into *
* Covered Software without special permission from the copyright holders. *
* *
* If you have any questions about the licensing restrictions on using *
* Nmap in other works, are 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@nmap.com for further *
* information. *
* *
* If you have received a written license agreement or contract for *
* Covered Software stating terms other than these, you may choose to use *
* and redistribute Covered Software under those terms instead of these. *
* *
* 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 send your changes *
* to the dev@nmap.org mailing list 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 Nmap *
* license file for more details (it's in a COPYING file included with *
* Nmap, and also available from https://svn.nmap.org/nmap/COPYING) *
* *
***************************************************************************/
#ifndef __ECHOHEADER_H__
#define __ECHOHEADER_H__ 1
#include "nping.h"
#define ECHO_CURRENT_PROTO_VER 0x01
/* Lengths */
#define STD_NEP_HEADER_LEN 16 /* Common NEP header length */
#define MAC_LENGTH 32 /* Length of message authentication codes */
#define NONCE_LEN 32 /* Length of client/server nonces */
#define PARTNER_IP_LEN 16 /* Length of Partner IP field */
#define PACKETSPEC_FIELD_LEN 108 /* Length of the packet specification */
#define ERROR_MSG_LEN 80 /* Length of NEP_ERROR message strings */
#define NEP_HANDSHAKE_SERVER_LEN 96
#define NEP_HANDSHAKE_CLIENT_LEN 144
#define NEP_HANDSHAKE_FINAL_LEN 112
#define NEP_PACKETSPEC_LEN 160
#define NEP_READY_LEN 48
#define NEP_ERROR_LEN 128
#define ECHOED_PKT_HEADER_LEN 4 /* Length of {DLT Type, Packet Length} */
#define MAX_ECHOED_PACKET_LEN 9212 /* Max length for echoed packets */
#define MAX_DATA_LEN (ECHOED_PKT_HEADER_LEN + MAX_ECHOED_PACKET_LEN + MAC_LENGTH)
#define NEP_ECHO_MIN_LEN 64
#define NEP_ECHO_MAX_LEN ( STD_NEP_HEADER_LEN + MAX_DATA_LEN )
#define MAX_NEP_PACKET_LENGTH ( STD_NEP_HEADER_LEN + MAX_DATA_LEN )
/* Message types */
#define TYPE_NEP_HANDSHAKE_SERVER 0x01
#define TYPE_NEP_HANDSHAKE_CLIENT 0x02
#define TYPE_NEP_HANDSHAKE_FINAL 0x03
#define TYPE_NEP_PACKET_SPEC 0x04
#define TYPE_NEP_READY 0x05
#define TYPE_NEP_ECHO 0x06
#define TYPE_NEP_ERROR 0x07
/* Field specifiers */
#define PSPEC_IPv4_TOS 0xA0
#define PSPEC_IPv4_ID 0xA1
#define PSPEC_IPv4_FRAGOFF 0xA2
#define PSPEC_IPv4_PROTO 0xA3
#define PSPEC_IPv6_TCLASS 0xB0
#define PSPEC_IPv6_FLOW 0xB1
#define PSPEC_IPv6_NHDR 0xB2
#define PSPEC_TCP_SPORT 0xC0
#define PSPEC_TCP_DPORT 0xC1
#define PSPEC_TCP_SEQ 0xC2
#define PSPEC_TCP_ACK 0xC3
#define PSPEC_TCP_FLAGS 0xC4
#define PSPEC_TCP_WIN 0xC5
#define PSPEC_TCP_URP 0xC6
#define PSPEC_ICMP_TYPE 0xD0
#define PSPEC_ICMP_CODE 0xD1
#define PSPEC_UDP_SPORT 0xE0
#define PSPEC_UDP_DPORT 0xE1
#define PSPEC_UDP_LEN 0xE2
#define PSPEC_PAYLOAD_MAGIC 0xFF
/* Protocol identifiers for NEP_PACKET_SPEC */
#define PSPEC_PROTO_TCP 0x06
#define PSPEC_PROTO_UDP 0x11
#define PSPEC_PROTO_ICMP 0x01
#define DLT_NODATALINKHEADERINCLUDED 0x0000
/* GENERAL FORMAT:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Total Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Timestamp |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
. .
. DATA .
. .
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
. .
. Message Authentication Code .
. .
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
class EchoHeader : public ApplicationLayerElement {
private:
/* Common NEP packet header */
struct nep_hdr{
u8 echo_ver; /**< Protocol Version */
u8 echo_mtype; /**< Message Type */
u16 echo_tlen; /**< Total Length */
u32 echo_seq; /**< Sequence Number */
u32 echo_ts; /**< Timestamp */
u32 echo_res; /**< Reserved */
u8 data[MAX_DATA_LEN];
}__attribute__((__packed__));
typedef struct nep_hdr echohdr_t;
/* NEP_HANDSHAKE_SERVER data */
struct nep_hs_serv_data{
u8 server_nonce[NONCE_LEN];
u8 reserved[16];
u8 mac[MAC_LENGTH];
}__attribute__((__packed__));
typedef struct nep_hs_serv_data nep_hs_serv_data_t;
/* NEP_HANDSHAKE_CLIENT data */
struct nep_hs_clnt_data{
u8 server_nonce[NONCE_LEN];
u8 client_nonce[NONCE_LEN];
u8 partner_ip[PARTNER_IP_LEN];
u8 ip_version;
u8 reserved[15];
u8 mac[MAC_LENGTH];
}__attribute__((__packed__));
typedef struct nep_hs_clnt_data nep_hs_clnt_data_t;
/* NEP_HANDSHAKE_FINAL data */
struct nep_hs_final_data{
u8 client_nonce[NONCE_LEN];
u8 partner_ip[PARTNER_IP_LEN];
u8 ip_version;
u8 reserved[15];
u8 mac[MAC_LENGTH];
}__attribute__((__packed__));
typedef struct nep_hs_final_data nep_hs_final_data_t;
/* NEP_PACKET_SPEC data */
struct nep_packet_spec_data{
u8 ip_version;
u8 protocol;
u16 packet_count;
u8 packetspec[PACKETSPEC_FIELD_LEN];
u8 mac[MAC_LENGTH];
}__attribute__((__packed__));
typedef struct nep_packet_spec_data nep_packet_spec_data_t;
/* NEP_READY data */
struct nep_ready_data{
u8 mac[MAC_LENGTH];
}__attribute__((__packed__));
typedef struct nep_ready_data nep_ready_data_t;
/* NEP_ECHO data */
struct nep_echo_data{
u16 dlt_type;
u16 packet_len;
u8 payload_and_mac[MAX_ECHOED_PACKET_LEN + MAC_LENGTH];
}__attribute__((__packed__));
typedef struct nep_echo_data nep_echo_data_t;
/* NEP_ERROR data */
struct nep_error_data{
u8 errmsg[ERROR_MSG_LEN];
u8 mac[MAC_LENGTH];
}__attribute__((__packed__));
typedef struct nep_error_data nep_error_data_t;
/* Attributes */
echohdr_t h;
echohdr_t h_tmp;
nep_hs_serv_data_t *data_hsserv;
nep_hs_clnt_data_t *data_hsclnt;
nep_hs_final_data_t *data_hsfinal;
nep_packet_spec_data_t *data_pspec;
nep_ready_data_t *data_ready;
nep_echo_data_t *data_echo;
u8 *echo_mac;
int echo_bytes;
nep_error_data_t *data_error;
u8 *fs_off; /**< Current field spec offset */
int fs_bytes; /**< Current field spec byte count */
private:
int getFieldLength(u8 field);
public:
EchoHeader();
~EchoHeader();
void reset();
u8 *getBufferPointer();
int storeRecvData(const u8 *buf, size_t len);
int protocol_id() const;
int setVersion(u8 val);
u8 getVersion();
int setMessageType(u8 val);
u8 getMessageType();
int setTotalLength(u16 val);
int setTotalLength();
u16 getTotalLength();
int setSequenceNumber(u32 val);
u32 getSequenceNumber();
int setTimestamp(u32 val);
int setTimestamp();
u32 getTimestamp();
int setReserved(u32 val);
u32 getReserved();
int setMessageAuthenticationCode(u8 *key, size_t keylen);
u8 *getMessageAuthenticationCode();
int verifyMessageAuthenticationCode(u8 *key, size_t keylen);
int setServerNonce(u8 *nonce);
u8 *getServerNonce();
int setClientNonce(u8 *nonce);
u8 *getClientNonce();
int setPartnerAddress(struct in_addr val);
int setPartnerAddress(struct in6_addr val);
int getPartnerAddress(struct in_addr *dst);
int getPartnerAddress(struct in6_addr *dst);
int setIPVersion(u8 ver);
u8 getIPVersion();
int setProtocol(u8 proto);
u8 getProtocol();
int setPacketCount(u16 c);
u16 getPacketCount();
int addFieldSpec(u8 field, u8 *val);
int addFieldSpec(u8 field, u8 *val, size_t flen);
int getNextFieldSpec(u8 *field, u8 *dst_buff, size_t *final_len);
int rewindFieldSpecCounters();
int setDLT(u16 dlt);
u16 getDLT();
int setPacketLength(u16 len);
u16 getPacketLength();
int setEchoedPacket(const u8 *pkt, size_t pktlen);
u8 *getEchoedPacket(u16 *final_len);
u8 *getEchoedPacket();
int updateEchoInternals();
int setErrorMessage(const char *err);
char *getErrorMessage();
u8 *getCiphertextBounds(size_t *len);
u8 *getCiphertextBounds(size_t *final_len, int message_type);
u8 *encrypt(u8 *key, size_t key_len, u8 *iv);
u8 *decrypt(u8 *key, size_t key_len, u8 *iv, int message_type);
};
#endif /* __ECHOHEADER_H__ */