91 lines
1.8 KiB
Go
91 lines
1.8 KiB
Go
package eap
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import (
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"encoding/binary"
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"errors"
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log "github.com/sirupsen/logrus"
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"goauthentik.io/internal/outpost/radius/eap/debug"
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"goauthentik.io/internal/outpost/radius/eap/tls"
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)
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type Code uint8
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const (
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CodeRequest Code = 1
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CodeResponse Code = 2
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)
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type Type uint8
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const (
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TypeIdentity Type = 1
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TypeMD5Challenge Type = 4
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TypeTLS Type = 13
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)
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type Packet struct {
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code Code
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id uint8
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length uint16
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msgType Type
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rawPayload []byte
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Payload Payload
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}
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type Payload interface {
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Decode(raw []byte) error
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Encode() ([]byte, error)
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}
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type PayloadWriter struct{}
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func emptyPayload(t Type) Payload {
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switch t {
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case TypeIdentity:
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return &IdentityPayload{}
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case TypeTLS:
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return &tls.Payload{}
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}
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return nil
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}
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func Decode(raw []byte) (*Packet, error) {
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packet := &Packet{}
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packet.code = Code(raw[0])
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packet.id = raw[1]
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packet.length = binary.BigEndian.Uint16(raw[2:])
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if packet.length != uint16(len(raw)) {
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return nil, errors.New("mismatched packet length")
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}
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if len(raw) > 4 && (packet.code == CodeRequest || packet.code == CodeResponse) {
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packet.msgType = Type(raw[4])
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}
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packet.Payload = emptyPayload(packet.msgType)
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packet.rawPayload = raw[5:]
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log.WithField("raw", debug.FormatBytes(raw)).Debug("EAP: decode raw")
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err := packet.Payload.Decode(raw[5:])
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if err != nil {
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return nil, err
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}
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return packet, nil
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}
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func (p *Packet) Encode() ([]byte, error) {
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buff := make([]byte, 5)
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buff[0] = uint8(p.code)
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buff[1] = uint8(p.id)
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payloadBuffer, err := p.Payload.Encode()
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if err != nil {
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return buff, err
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}
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binary.BigEndian.PutUint16(buff[2:], uint16(len(payloadBuffer)+5))
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if p.code == CodeRequest || p.code == CodeResponse {
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buff[4] = uint8(p.msgType)
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}
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buff = append(buff, payloadBuffer...)
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return buff, nil
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}
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