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proxy.h
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proxy.h
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/*
* UFTP - UDP based FTP with multicast
*
* Copyright (C) 2001-2015 Dennis A. Bush, Jr. bush@tcnj.edu
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Additional permission under GNU GPL version 3 section 7
*
* If you modify this program, or any covered work, by linking or
* combining it with the OpenSSL project's OpenSSL library (or a
* modified version of that library), containing parts covered by the
* terms of the OpenSSL or SSLeay licenses, the copyright holder
* grants you additional permission to convey the resulting work.
* Corresponding Source for a non-source form of such a combination
* shall include the source code for the parts of OpenSSL used as well
* as that of the covered work.
*/
#ifndef _PROXY_H
#define _PROXY_H
#include "uftp_common.h"
#include "encryption.h"
#define MAX_PEND 10
#define MAXLIST 100
#define KEY_REQ_LIMIT 5
/**
* Type of proxy
*/
enum proxy_type {
UNDEF_PROXY = 0, /// Not specified, indicates an error
SERVER_PROXY = 1, /// Server proxy: forwards to a specific place
CLIENT_PROXY = 2, /// Client proxy: sends to specified destaddr
RESPONSE_PROXY = 3, /// Response proxy: response aggregation only
};
/**
* The state of the given group
*/
enum proxy_phase {
PR_PHASE_REGISTERED = 1, /// Currently setting up group
PR_PHASE_READY = 2, /// Still in setup, but received KEYINFO
PR_PHASE_RECEIVING = 3, /// Group setup complete
PR_PHASE_DONE = 4, /// All clients send COMPLETE for group
};
/**
* The state of a given client when encryption is enabled
*/
enum proxy_client_state {
PR_CLIENT_MUTE = 0, /// Got nothing yet
PR_CLIENT_REGISTERED = 1, /// Got REGISTER (and CLIENT_KEY if required)
PR_CLIENT_CONF = 2, /// Got REG_CONF from server
PR_CLIENT_READY = 3, /// Got INFO_ACK in response to KEYINFO
PR_CLIENT_DONE = 4, /// Sent COMPLETE for group
};
/**
* Info for a particular client for the given group
*/
struct pr_destinfo_t {
char name[DESTNAME_LEN]; /// Hostname of client
uint32_t id; /// UID of client (network byte order)
union key_t pubkey; /// The client's public key
int pubkeylen; /// The length of client's key in bytes
union key_t dhkey; /// The client's ECDH public key
uint8_t verifydata[PUBKEY_LEN]; /// The verify data from a CLIENT_KEY
uint16_t verifylen; /// The length of verifydata in bytes
int registered; /// True if we received a REGISTER
struct timeval regtime; /// Timestamp from last REGISTER
int verified; /// True if we have a verified CLIENT_KEY
int state; /// State as specified by proxy_client_state
int pending; /// Index of pending message
uint8_t rand2[RAND_LEN]; /// Client's random number
uint8_t premaster[MASTER_LEN]; /// Premaster secret sent by client
unsigned int premaster_len; /// Length of premaster secret
uint8_t master[MASTER_LEN]; /// Master key for client
uint8_t hmackey[HMAC_LEN]; /// HMAC key for client
uint8_t key[MAXKEY]; /// Symmetric encryption key for client
uint8_t salt[MAXIV]; /// Salt for block cypher IV for client
};
/**
* Info for a message pending to go upstream
*/
struct pr_pending_info_t {
int msg, count; /// Type and number of pending responses
uint16_t file_id; /// File ID from last client message
struct timeval tstamp; /// Timestamp from last client message
struct timeval rx_tstamp; /// Time last client message received
uint16_t section; /// Section number from last status
uint8_t *naklist; /// NAK list from last status
uint8_t partial; /// PARTIAL flag from last FILEINFO_ACK
uint8_t comp_status; /// status flag from a COMPLETE
};
/**
* Info for a particular group
*/
struct pr_group_list_t {
uint32_t group_id; /// Group ID
uint8_t group_inst; /// Group instance ID (restart number)
uint16_t file_id; /// Dummy field, present for logging macros
uint8_t version; /// Protocol version number of server
uint32_t src_id; /// ID of server
double grtt; /// Server's GRTT
uint8_t robust, cc_type; /// Robust factor, congestion control type
uint32_t gsize; /// Group size estimate
int send_seq_up; /// Outgoing upstream seq. number
int send_seq_down; /// Outgoing downstream seq. number
union sockaddr_u publicmcast, privatemcast;
int multi_join; /// True if we're listening on private addr
unsigned int blocksize; /// Size of packet payload
unsigned int datapacketsize; /// Max size of UFTP packet
union sockaddr_u up_addr; /// Upstream addr to send responses back to
struct timeval phase_expire_time, phase_timeout_time, timeout_time;
struct timeval start_phase_timeout_time, start_timeout_time;
int phase, client_auth;
int keyinfo_cnt;
struct pr_pending_info_t pending[MAX_PEND]; /// Pending messages to send
uint8_t last_seq; /// Last sequence number used in STATUS
int keytype, hashtype, sigtype, keyextype; /// Encryption parameters
union key_t server_pubkey; /// Server's RSA public key
union key_t proxy_privkey; /// Proxy's RSA private key for this group
union key_t server_dhkey; /// Server ECDH public key for this group
union key_t proxy_dhkey; /// Proxy ECDH public key for this group
unsigned int server_pubkeylen; /// Length in bytes of server key
unsigned int proxy_privkeylen; /// Length in bytes of proxy key
uint8_t rand1[RAND_LEN]; /// Server's random number
uint8_t rand2[RAND_LEN]; /// Proxy's random number
uint8_t premaster[MASTER_LEN]; /// Premaster secret sent by proxy
unsigned int premaster_len; /// Length of premaster secret
uint8_t master[MASTER_LEN]; /// Master key for proxy
uint8_t hmackey[HMAC_LEN]; /// HMAC key for proxy
uint8_t key[MAXKEY]; /// Symmetric encryption key for proxy
uint8_t salt[MAXIV]; /// Salt for block cypher IV for proxy
uint8_t groupmaster[MASTER_LEN];/// Master key for server
uint8_t grouphmackey[HMAC_LEN]; /// HMAC key for server
uint8_t groupkey[MAXKEY]; /// Symmetric encryption key for server
uint8_t groupsalt[MAXIV]; /// Salt for block cypher IV for server
uint64_t ivctr; /// Counter portion of the IV
int ivlen, keylen, hmaclen; /// Length of HMAC key, symmetric key and iv
struct pr_destinfo_t destinfo[MAXPROXYDEST]; /// List of clients
int destcount; /// Number of clients served by this proxy
};
/**
* Global command line values and sockets
*/
extern SOCKET listener;
extern char pidfile[MAXPATHNAME];
extern char keyfile[MAXLIST][MAXPATHNAME], keyinfo[MAXLIST][MAXPATHNAME];
extern int proxy_type, debug, rcvbuf, dscp, keyfile_count, keyinfo_count;
extern int hb_interval, priority;
extern unsigned int ttl;
char portname[PORTNAME_LEN], out_portname[PORTNAME_LEN];
int port, out_port;
extern union sockaddr_u down_addr;
extern int have_down_fingerprint;
extern uint8_t down_fingerprint[HMAC_LEN];
extern uint32_t down_nonce, uid;
extern union sockaddr_u hb_hosts[MAXLIST];
extern union sockaddr_u pub_multi[MAX_INTERFACES];
extern struct fp_list_t server_fp[MAXLIST], client_fp[MAXPROXYDEST];
extern struct iflist ifl[MAX_INTERFACES], m_interface[MAX_INTERFACES];
extern struct timeval next_hb_time, last_key_req;
extern int ifl_len, hbhost_count, server_fp_count, client_fp_count;
extern int key_count, pub_multi_count, interface_count, sys_keys;
extern struct iflist out_if;
extern union key_t privkey[MAXLIST];
extern int privkey_type[MAXLIST];
extern union key_t dhkey;
extern uint8_t ecdh_curve;
extern struct pr_group_list_t group_list[MAXLIST];
#endif // _PROXY_H