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120 lines
3.6 KiB
Go
120 lines
3.6 KiB
Go
// consts.go - consts for xsnet
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// Copyright (c) 2017-2019 Russell Magee
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// Licensed under the terms of the MIT license (see LICENSE.mit in this
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// distribution)
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//
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// golang implementation by Russ Magee (rmagee_at_gmail.com)
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package xsnet
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// KEX algorithm values
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//
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// Specified (in string form) as the extensions parameter
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// to xsnet.Dial()
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// Alg is sent in a uint8 so there are up to 256 possible
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const (
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KEX_HERRADURA256 = iota // this MUST be first for default if omitted in ctor
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KEX_HERRADURA512
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KEX_HERRADURA1024
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KEX_HERRADURA2048
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KEX_resvd4
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KEX_resvd5
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KEX_resvd6
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KEX_resvd7
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KEX_KYBER512
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KEX_KYBER768
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KEX_KYBER1024
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KEX_resvd11
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KEX_NEWHOPE
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KEX_NEWHOPE_SIMPLE // 'NewHopeLP-Simple' - https://eprint.iacr.org/2016/1157
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KEX_resvd14
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KEX_resvd15
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KEX_invalid = 255
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)
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// Sent from client to server in order to specify which
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// algo shall be used (see xsnet.KEX_HERRADURA256, ...)
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type KEXAlg uint8
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// Extended exit status codes - indicate comm/pty issues
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// rather than remote end normal UNIX exit codes
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const (
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CSENone = 1024 + iota
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CSETruncCSO // No CSOExitStatus in payload
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CSEStillOpen // Channel closed unexpectedly
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CSEExecFail // cmd.Start() (exec) failed
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CSEPtyExecFail // pty.Start() (exec w/pty) failed
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CSEPtyGetNameFail // failed to obtain pty name
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CSEKEXAlgDenied // server rejected proposed KEX alg
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CSECipherAlgDenied // server rejected proposed Cipher alg
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CSEHMACAlgDenied // server rejected proposed HMAC alg
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)
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// Extended (>255 UNIX exit status) codes
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// This indicate channel-related or internal errors
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type CSExtendedCode uint32
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// Channel Status/Op bytes - packet types
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const (
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// Main connection/session control
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CSONone = iota // No error, normal packet
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CSOHmacInvalid // HMAC mismatch detected on remote end
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CSOTermSize // set term size (rows:cols)
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CSOExitStatus // Remote cmd exit status
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CSOChaff // Dummy packet, do not pass beyond decryption
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// Client side errors
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CSOLoginTimeout
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// Tunnel setup/control/status
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CSOTunSetup // client -> server tunnel setup request (dstport)
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CSOTunSetupAck // server -> client tunnel setup ack
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CSOTunRefused // server -> client: tunnel rport connection refused
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CSOTunData // packet contains tunnel data [rport:data]
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CSOTunKeepAlive // client tunnel heartbeat
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CSOTunDisconn // server -> client: tunnel rport disconnected
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CSOTunHangup // client -> server: tunnel lport hung up
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)
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// TunEndpoint.tunCtl control values - used to control workers for client
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// or server tunnels depending on the code
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const (
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TunCtl_Client_Listen = 'a'
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// [CSOTunAccept]
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// status: server has ack'd tun setup request
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// action: client should accept (after re-listening, if required) on lport
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TunCtl_Server_Dial = 'd' // server has dialled OK, client side can accept() conns
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// [CSOTunAccept]
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// status: client wants to open tunnel to rport
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// action:server side should dial() rport on client's behalf
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)
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// Channel status Op byte type (see CSONone, ... and CSENone, ...)
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type CSOType uint32
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//TODO: this should be small (max unfragmented packet size?)
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const MAX_PAYLOAD_LEN = 4*1024*1024*1024 - 1
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// Session symmetric crypto algs
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const (
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CAlgAES256 = iota
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CAlgTwofish128 // golang.org/x/crypto/twofish
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CAlgBlowfish64 // golang.org/x/crypto/blowfish
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CAlgCryptMT1 //cryptmt using mtwist64
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CAlgChaCha20_12
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CAlgNoneDisallowed
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)
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// Available ciphers for hkex.Conn
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type CSCipherAlg uint32
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// Session packet auth HMAC algs
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const (
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HmacSHA256 = iota
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HmacSHA512
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HmacNoneDisallowed
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)
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// Available HMACs for hkex.Conn
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type CSHmacAlg uint32
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