xs/hkexnet/consts.go

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// consts.go - consts for hkexnet
// Copyright (c) 2017-2018 Russell Magee
// Licensed under the terms of the MIT license (see LICENSE.mit in this
// distribution)
//
// golang implementation by Russ Magee (rmagee_at_gmail.com)
package hkexnet
const (
KEX_HERRADURA256 = iota // this MUST be first for default if omitted in ctor
KEX_HERRADURA512
KEX_HERRADURA1024
KEX_HERRADURA2048
KEX_resvd4
KEX_resvd5
KEX_resvd6
KEX_resvd7
KEX_KYBER512
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KEX_KYBER768
KEX_KYBER1024
KEX_resvd11
KEX_resvd12
KEX_resvd13
KEX_resvd14
KEX_resvd15
)
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// Sent from client to server in order to specify which
// algo shall be used (eg., HerraduraKEx, [TODO: others...])
type KEXAlg uint8
// Extended exit status codes - indicate comm/pty issues
// rather than remote end normal UNIX exit codes
const (
CSENone = 1024 + iota
//CSEBadAuth // Failed login password
CSETruncCSO // No CSOExitStatus in payload
CSEStillOpen // Channel closed unexpectedly
CSEExecFail // cmd.Start() (exec) failed
CSEPtyExecFail // pty.Start() (exec w/pty) failed
)
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// Extended (>255 UNIX exit status) codes
// This indicate channel-related or internal errors
type CSExtendedCode uint32
// Channel Status/Op bytes - packet types
const (
// Main connection/session control
CSONone = iota // No error, normal packet
CSOHmacInvalid // HMAC mismatch detected on remote end
CSOTermSize // set term size (rows:cols)
CSOExitStatus // Remote cmd exit status
CSOChaff // Dummy packet, do not pass beyond decryption
// Tunnel setup/control/status
CSOTunSetup // client -> server tunnel setup request (dstport)
CSOTunInUse // server -> client: tunnel rport is in use
CSOTunSetupAck // server -> client tunnel setup ack
CSOTunAccept // client -> server: tunnel client got an Accept()
// (Do we need a CSOTunAcceptAck server->client?)
CSOTunRefused // server -> client: tunnel rport connection refused
CSOTunData // packet contains tunnel data [rport:data]
CSOTunDisconn // server -> client: tunnel rport disconnected
CSOTunHangup // client -> server: tunnel lport hung up
)
// TunEndpoint.tunCtl control values
const (
TunCtl_AcceptedClient = 'a' // client side has accept()ed a conn
// [CSOTunAccept]
// status: client listen() worker accepted conn on lport
// action:server side should dial() rport on client's behalf
TunCtl_LostClient = 'h' // client side has hung up
// [CSOTunHangup]
// status: client side conn hung up from lport
// action:server side should hang up on rport, on client's behalf
TunCtl_ConnRefused = 'r' // server side couldn't complete tunnel
// [CSOTunRefused]
// status:server side could not dial() remote side
TunCtl_LostConn = 'l' // server side disconnected
// [CSOTunDisconn]
// status:server side lost connection to rport
// action:client should disconnect accepted lport connection
)
// Channel status Op byte type
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type CSOType uint32
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//TODO: this should be small (max unfragmented packet size?)
const MAX_PAYLOAD_LEN = 4*1024*1024*1024 - 1
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const (
CAlgAES256 = iota
CAlgTwofish128 // golang.org/x/crypto/twofish
CAlgBlowfish64 // golang.org/x/crypto/blowfish
CAlgCryptMT1 //cryptmt using mtwist64
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CAlgNoneDisallowed
)
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// Available ciphers for hkex.Conn
type CSCipherAlg uint32
const (
HmacSHA256 = iota
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HmacSHA512
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HmacNoneDisallowed
)
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// Available HMACs for hkex.Conn (TODO: not currently used)
type CSHmacAlg uint32