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fw-daemon/socks5/server_rfc1929.go

85 lines
1.8 KiB

/*
* server_rfc1929.go - SOCSK 5 server authentication.
*
* To the extent possible under law, Yawning Angel has waived all copyright and
* related or neighboring rights to or-ctl-filter, using the creative commons
* "cc0" public domain dedication. See LICENSE or
* <http://creativecommons.org/publicdomain/zero/1.0/> for full details.
*/
package socks5
import (
"fmt"
"io"
)
const (
authRFC1929Ver = 0x01
authRFC1929Success = 0x00
authRFC1929Fail = 0x01
)
// AuthInfo is the RFC 1929 Username/Password authentication data.
type AuthInfo struct {
Uname []byte
Passwd []byte
}
func (req *Request) authRFC1929() (err error) {
sendErrResp := func() {
// Swallow write/flush errors, the auth failure is the relevant error.
resp := []byte{authRFC1929Ver, authRFC1929Fail}
req.conn.Write(resp[:])
}
// The client sends a Username/Password request.
// uint8_t ver (0x01)
// uint8_t ulen (>= 1)
// uint8_t uname[ulen]
// uint8_t plen (>= 1)
// uint8_t passwd[plen]
if err = req.readByteVerify("auth version", authRFC1929Ver); err != nil {
sendErrResp()
return
}
// Read the username.
var ulen byte
if ulen, err = req.readByte(); err != nil {
sendErrResp()
return
} else if ulen < 1 {
sendErrResp()
return fmt.Errorf("username with 0 length")
}
uname := make([]byte, ulen)
if _, err = io.ReadFull(req.conn, uname); err != nil {
sendErrResp()
return
}
// Read the password.
var plen byte
if plen, err = req.readByte(); err != nil {
sendErrResp()
return
} else if plen < 1 {
sendErrResp()
return fmt.Errorf("password with 0 length")
}
passwd := make([]byte, plen)
if _, err = io.ReadFull(req.conn, passwd); err != nil {
sendErrResp()
return
}
req.Auth.Uname = uname
req.Auth.Passwd = passwd
resp := []byte{authRFC1929Ver, authRFC1929Success}
_, err = req.conn.Write(resp[:])
return
}