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| -rw-r--r-- | nping/EchoHeader.h | 331 |
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diff --git a/nping/EchoHeader.h b/nping/EchoHeader.h new file mode 100644 index 0000000..4f7f7e4 --- /dev/null +++ b/nping/EchoHeader.h @@ -0,0 +1,331 @@ + +/*************************************************************************** + * 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) 1996-2023 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 __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__ */ |