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packet.go
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packet.go
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package radius
import (
"errors"
"crypto"
_ "crypto/md5"
"encoding/binary"
"net"
"time"
)
type PacketCode uint8
const (
AccessRequest PacketCode = 1
AccessAccept PacketCode = 2
AccessReject PacketCode = 3
AccountingRequest PacketCode = 4
AccountingResponse PacketCode = 5
AccessChallenge PacketCode = 11
StatusServer PacketCode = 12 //(experimental)
StatusClient PacketCode = 13 //(experimental)
Reserved PacketCode = 255
)
type AttributeType uint8
const (
//start rfc2865
_ = iota //drop the zero
UserName AttributeType = iota
UserPassword AttributeType = iota
CHAPPassword AttributeType = iota
NASIPAddress AttributeType = iota
NASPort AttributeType = iota
ServiceType AttributeType = iota
FramedProtocol AttributeType = iota
FramedIPAddress AttributeType = iota
FramedIPNetmask AttributeType = iota
FramedRouting AttributeType = iota
FilterId AttributeType = iota
FramedMTU AttributeType = iota
FramedCompression AttributeType = iota
LoginIPHost AttributeType = iota
LoginService AttributeType = iota
LoginTCPPort AttributeType = iota
_ = iota //17 unassigned
ReplyMessage AttributeType = iota
CallbackNumber AttributeType = iota
CallbackId AttributeType = iota
_ = iota //21 unassigned
FramedRoute AttributeType = iota
FramedIPXNetwork AttributeType = iota
State AttributeType = iota
Class AttributeType = iota
VendorSpecific AttributeType = iota
SessionTimeout AttributeType = iota
IdleTimeout AttributeType = iota
TerminationAction AttributeType = iota
CalledStationId AttributeType = iota
CallingStationId AttributeType = iota
NASIdentifier AttributeType = iota
ProxyState AttributeType = iota
LoginLATService AttributeType = iota
LoginLATNode AttributeType = iota
LoginLATGroup AttributeType = iota
FramedAppleTalkLink AttributeType = iota
FramedAppleTalkNetwork AttributeType = iota
FramedAppleTalkZone AttributeType = iota
AcctStatusType AttributeType = iota
AcctDelayTime AttributeType = iota
AcctInputOctets AttributeType = iota
AcctOutputOctets AttributeType = iota
AcctSessionId AttributeType = iota
AcctAuthentic AttributeType = iota
AcctSessionTime AttributeType = iota
AcctInputPackets AttributeType = iota
AcctOutputPackets AttributeType = iota
AcctTerminateCause AttributeType = iota
AcctMultiSessionId AttributeType = iota
AcctLinkCount AttributeType = iota
AcctInputGigawords AttributeType = iota
AcctOutputGigawords AttributeType = iota
Unassigned1 AttributeType = iota
EventTimestamp AttributeType = iota
EgressVLANID AttributeType = iota
IngressFilters AttributeType = iota
EgressVLANName AttributeType = iota
UserPriorityTable AttributeType = iota
CHAPChallenge AttributeType = 60
NASPortType AttributeType = 61
PortLimit AttributeType = 62
LoginLATPort AttributeType = 63
//end rfc2865
TunnelType AttributeType = iota
TunnelMediumType AttributeType = iota
TunnelClientEndpoint AttributeType = iota
TunnelServerEndpoint AttributeType = iota
AcctTunnelConnection AttributeType = iota
TunnelPassword AttributeType = iota
ARAPPassword AttributeType = iota
ARAPFeatures AttributeType = iota
ARAPZoneAccess AttributeType = iota
ARAPSecurity AttributeType = iota
ARAPSecurityData AttributeType = iota
PasswordRetry AttributeType = iota
Prompt AttributeType = iota
ConnectInfo AttributeType = iota
ConfigurationToken AttributeType = iota
EAPMessage AttributeType = iota
MessageAuthenticator AttributeType = iota
TunnelPrivateGroupID AttributeType = iota
TunnelAssignmentID AttributeType = iota
TunnelPreference AttributeType = iota
ARAPChallengeResponse AttributeType = iota
AcctInterimInterval AttributeType = iota
AcctTunnelPacketsLost AttributeType = iota
NASPortId AttributeType = iota
FramedPool AttributeType = iota
CUI AttributeType = iota
TunnelClientAuthID AttributeType = iota
TunnelServerAuthID AttributeType = iota
NASFilterRule AttributeType = iota
Unassigned AttributeType = iota
OriginatingLineInfo AttributeType = iota
NASIPv6Address AttributeType = iota
FramedInterfaceId AttributeType = iota
FramedIPv6Prefix AttributeType = iota
LoginIPv6Host AttributeType = iota
FramedIPv6Route AttributeType = iota
FramedIPv6Pool AttributeType = iota
ErrorCause AttributeType = iota
EAPKeyName AttributeType = iota
DigestResponse AttributeType = iota
DigestRealm AttributeType = iota
DigestNonce AttributeType = iota
DigestResponseAuth AttributeType = iota
DigestNextnonce AttributeType = iota
DigestMethod AttributeType = iota
DigestURI AttributeType = iota
DigestQop AttributeType = iota
DigestAlgorithm AttributeType = iota
DigestEntityBodyHash AttributeType = iota
DigestCNonce AttributeType = iota
DigestNonceCount AttributeType = iota
DigestUsername AttributeType = iota
DigestOpaque AttributeType = iota
DigestAuthParam AttributeType = iota
DigestAKAAuts AttributeType = iota
DigestDomain AttributeType = iota
DigestStale AttributeType = iota
DigestHA1 AttributeType = iota
SIPAOR AttributeType = iota
DelegatedIPv6Prefix AttributeType = iota
MIP6FeatureVector AttributeType = iota
MIP6HomeLinkPrefix AttributeType = iota
OperatorName AttributeType = iota
LocationInformation AttributeType = iota
LocationData AttributeType = iota
BasicLocationPolicyRules AttributeType = iota
ExtendedLocationPolicyRules AttributeType = iota
LocationCapable AttributeType = iota
RequestedLocationInfo AttributeType = iota
FramedManagementProtocol AttributeType = iota
ManagementTransportProtection AttributeType = iota
ManagementPolicyId AttributeType = iota
ManagementPrivilegeLevel AttributeType = iota
PKMSSCert AttributeType = iota
PKMCACert AttributeType = iota
PKMConfigSettings AttributeType = iota
PKMCryptosuiteList AttributeType = iota
PKMSAID AttributeType = iota
PKMSADescriptor AttributeType = iota
PKMAuthKey AttributeType = iota
DSLiteTunnelName AttributeType = iota
MobileNodeIdentifier AttributeType = iota
ServiceSelection AttributeType = iota
PMIP6HomeLMAIPv6Address AttributeType = iota
PMIP6VisitedLMAIPv6Address AttributeType = iota
PMIP6HomeLMAIPv4Address AttributeType = iota
PMIP6VisitedLMAIPv4Address AttributeType = iota
PMIP6HomeHNPrefix AttributeType = iota
PMIP6VisitedHNPrefix AttributeType = iota
PMIP6HomeInterfaceID AttributeType = iota
PMIP6VisitedInterfaceID AttributeType = iota
PMIP6HomeIPv4HoA AttributeType = iota
PMIP6VisitedIPv4HoA AttributeType = iota
PMIP6HomeDHCP4ServerAddress AttributeType = iota
PMIP6VisitedDHCP4ServerAddress AttributeType = iota
PMIP6HomeDHCP6ServerAddress AttributeType = iota
PMIP6VisitedDHCP6ServerAddress AttributeType = iota
UnassignedStart AttributeType = 161
UnassignedEnd AttributeType = 191
ExperimentalStart AttributeType= 192
ExperimentalEnd AttributeType= 223
ImplementationSpecificStart AttributeType= 224
ImplementationSpecificEnd AttributeType = 240
ReservedStart AttributeType= 241
ReservedEnd AttributeType= 254
)
type Packet struct {
server *Server
Code PacketCode
Identifier uint8
Authenticator [16]byte
AVPs []AVP
}
type AVP struct {
Type AttributeType
Value []byte
text string
address net.Addr
integer uint32
time time.Time
}
func (p *Packet) Encode(b []byte) (n int, ret []byte, err error) {
b[0] = uint8(p.Code)
b[1] = uint8(p.Identifier)
copy(b[4:20], p.Authenticator[:])
written := 20
bb := b[20:]
for i, _ := range p.AVPs {
n, err = p.AVPs[i].Encode(bb)
written += n
if err != nil {
return written, nil, err
}
bb = bb[n:]
}
//check if written too big.
binary.BigEndian.PutUint16(b[2:4], uint16(written))
// fix up the authenticator
hasher := crypto.Hash(crypto.MD5).New()
hasher.Write(b[:written])
hasher.Write([]byte(p.server.secret))
copy(b[4:20], hasher.Sum(nil))
return written, b, err
}
func (a AVP) Encode(b []byte) (n int, err error) {
fullLen := len(a.Value) + 2 //type and length
if fullLen > 255 || fullLen < 2 {
return 0, errors.New("value too big for attribute")
}
b[0] = uint8(a.Type)
b[1] = uint8(fullLen)
copy(b[2:], a.Value)
return fullLen, err
}
func (a AttributeType) String() string {
switch a {
case UserName:
return "Username"
case UserPassword:
return "UserPassword"
case CHAPPassword:
return "CHAPPassword"
case NASIPAddress:
return "NASIPAddress"
case NASPort:
return "NASPort"
case ServiceType:
return "ServiceType"
case FramedProtocol:
return "FramedProtocol"
case FramedIPAddress:
return "FramedIPAddress"
case FramedIPNetmask:
return "FramedIPNetmask"
case FramedRouting:
return "FramedRouting"
case FilterId:
return "FilterId"
case FramedMTU:
return "FramedMTU"
case FramedCompression:
return "FramedCompression"
case LoginIPHost:
return "LoginIPHost"
case LoginService:
return "LoginService"
case LoginTCPPort:
return "LoginTCPPort"
case 17:
return "unassigned 17"
case ReplyMessage:
return "ReplyMessage"
case CallbackNumber:
return "CallbackNumber"
case CallbackId:
return "CallbackId"
case 21:
return "unassigned 21"
case FramedRoute:
return "FramedRoute"
case FramedIPXNetwork:
return "FramedIPXNetwork"
case State:
return "State"
case Class:
return "Class"
case VendorSpecific:
return "VendorSpecific"
case SessionTimeout:
return "SessionTimeout"
case IdleTimeout:
return "IdleTimeout"
case TerminationAction:
return "TerminationAction"
case CalledStationId:
return "CalledStationId"
case CallingStationId:
return "CallingStationId"
case NASIdentifier:
return "NASIdentifier"
case ProxyState:
return "ProxyState"
case LoginLATService:
return "LoginLATService"
case LoginLATNode:
return "LoginLATNode"
case LoginLATGroup:
return "LoginLATGroup"
case FramedAppleTalkLink:
return "FramedAppleTalkLink"
case FramedAppleTalkNetwork:
return "FramedAppleTalkNetwork"
case FramedAppleTalkZone:
return "FramedAppleTalkZone"
case AcctStatusType:
return "AcctStatusType"
case AcctDelayTime:
return "AcctDelayTime"
case AcctInputOctets:
return "AcctInputOctets"
case AcctOutputOctets:
return "AcctOutputOctets"
case AcctSessionId:
return "AcctSessionId"
case AcctAuthentic:
return "AcctAuthentic"
case AcctSessionTime:
return "AcctSessionTime"
case AcctInputPackets:
return "AcctInputPackets"
case AcctOutputPackets:
return "AcctOutputPackets"
case AcctTerminateCause:
return "AcctTerminateCause"
case AcctMultiSessionId:
return "AcctMultiSessionId"
case AcctLinkCount:
return "AcctLinkCount"
case 52, 53, 54, 55, 56, 57, 58, 59:
return "ReservedForAccounting"
case CHAPChallenge:
return "CHAPChallenge"
case NASPortType:
return "NASPortType"
case PortLimit:
return "PortLimit"
case LoginLATPort:
return "LoginLATPort"
}
return "unknown attribute type"
}
func (p PacketCode) String() string {
switch p {
case AccessRequest:
return "AccessRequest"
case AccessAccept:
return "AccessAccept"
case AccessReject:
return "AccessReject"
case AccountingRequest:
return "AccountingRequest"
case AccountingResponse:
return "AccountingResponse"
case AccessChallenge:
return "AccessChallenge"
case StatusServer:
return "StatusServer"
case StatusClient:
return "StatusClient"
case Reserved:
return "Reserved"
}
return "unknown packet code"
}
func (p *Packet) Has(attrType AttributeType) bool {
for i, _ := range p.AVPs {
if p.AVPs[i].Type == attrType {
return true
}
}
return false
}
func (p *Packet) Attributes(attrType AttributeType) []*AVP {
ret := []*AVP(nil)
for i, _ := range p.AVPs {
if p.AVPs[i].Type == attrType {
ret = append(ret,&p.AVPs[i])
}
}
return ret
}
func (p *Packet) Valid() bool {
switch p.Code {
case AccessRequest:
if !(p.Has(NASIPAddress) || p.Has(NASIdentifier)) {
return false
}
if p.Has(CHAPPassword) && p.Has(UserPassword) {
return false
}
return true
case AccessAccept:
return true
case AccessReject:
return true
case AccountingRequest:
return true
case AccountingResponse:
return true
case AccessChallenge:
return true
case StatusServer:
return true
case StatusClient:
return true
case Reserved:
return true
}
return true
}
func (p *Packet) Reply() *Packet {
pac := new(Packet)
pac.Authenticator = p.Authenticator
pac.Identifier = p.Identifier
pac.server = p.server
return pac
}
func (p *Packet) SendAndWait(c net.PacketConn, addr net.Addr) (pac *Packet, err error) {
var buf [4096]byte
err = p.Send(c, addr)
if err != nil {
return nil, err
}
n, addr, err := c.ReadFrom(buf[:])
b := buf[:n]
pac = new(Packet)
pac.Code = PacketCode(b[0])
pac.Identifier = b[1]
copy(pac.Authenticator[:], b[4:20])
return pac, nil
}
func (p *Packet) Send(c net.PacketConn, addr net.Addr) error {
var buf [4096]byte
n, _, err := p.Encode(buf[:])
if err != nil {
return err
}
n, err = c.WriteTo(buf[:n], addr)
return err
}
func (p *Packet) Decode(buf []byte) error {
p.Code = PacketCode(buf[0])
p.Identifier = buf[1]
copy(p.Authenticator[:], buf[4:20])
//read attributes
b := buf[20:]
for len(b) >= 2 {
attr := AVP{}
attr.Type = AttributeType(b[0])
length := uint8(b[1])
if int(length) > len(b) {
return errors.New("invalid length")
}
attr.Value = append(attr.Value,b[2:length]...)
/*validator := validation[attr.Type]
if err := validator.Validate(p,&attr); err != nil {
return err
}*/
p.AVPs = append(p.AVPs,attr)
b = b[length:]
}
return nil
}