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SoftEtherVPN/src/Cedar/Radius.c
dnobori 76ae935172 Cedar: various fixes
2019-11-23 04:23:51 +01:00

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// SoftEther VPN Source Code - Developer Edition Master Branch
// Cedar Communication Module
// Radius.c
// Radius authentication module
#include "CedarPch.h"
////////// Modern implementation
// send PEAP-MSCHAPv2 auth client response
bool PeapClientSendMsChapv2AuthClientResponse(EAP_CLIENT *e, UCHAR *client_response, UCHAR *client_challenge)
{
bool ret = false;
EAP_MSCHAPV2_RESPONSE msg1;
EAP_MESSAGE msg2;
EAP_MESSAGE msg4;
if (e == NULL || client_response == NULL || client_challenge == NULL)
{
return false;
}
Zero(&msg1, sizeof(msg1));
Zero(&msg2, sizeof(msg2));
Zero(&msg4, sizeof(msg4));
msg1.Type = EAP_TYPE_MS_AUTH;
msg1.Chap_Opcode = EAP_MSCHAPV2_OP_RESPONSE;
msg1.Chap_Id = e->MsChapV2Challenge.Chap_Id;
msg1.Chap_Len = Endian16(54 + StrLen(e->Username));
msg1.Chap_ValueSize = 49;
Copy(msg1.Chap_PeerChallenge, client_challenge, 16);
Copy(msg1.Chap_NtResponse, client_response, 24);
Copy(msg1.Chap_Name, e->Username, MIN(StrLen(e->Username), 255));
if (SendPeapPacket(e, &msg1, 59 + StrLen(e->Username)) &&
GetRecvPeapMessage(e, &msg2))
{
if (msg2.Type == EAP_TYPE_MS_AUTH &&
((EAP_MSCHAPV2_GENERAL *)&msg2)->Chap_Opcode == EAP_MSCHAPV2_OP_SUCCESS)
{
EAP_MSCHAPV2_SUCCESS_SERVER *eaps = (EAP_MSCHAPV2_SUCCESS_SERVER *)&msg2;
if (StartWith(eaps->Message, "S="))
{
BUF *buf = StrToBin(eaps->Message + 2);
if (buf && buf->Size == 20)
{
Copy(&e->MsChapV2Success, eaps, sizeof(EAP_MSCHAPV2_SUCCESS_SERVER));
Copy(e->ServerResponse, buf->Buf, 20);
if (true)
{
EAP_MSCHAPV2_SUCCESS_CLIENT msg3;
Zero(&msg3, sizeof(msg3));
msg3.Type = EAP_TYPE_MS_AUTH;
msg3.Chap_Opcode = EAP_MSCHAPV2_OP_SUCCESS;
if (SendPeapPacket(e, &msg3, 6) && GetRecvPeapMessage(e, &msg4))
{
UCHAR *rd = ((UCHAR *)&msg4);
if (rd[4] == 0x01 && rd[8] == 0x21 && rd[9] == 0x80 &&
rd[10] == 0x03 && rd[11] == 0x00 && rd[12] == 0x02 &&
rd[13] == 0x00 && rd[14] == 0x01)
{
UCHAR reply[15];
Zero(reply, sizeof(reply));
reply[4] = 0x02; reply[5] = rd[5]; reply[6] = 0x00; reply[7] = 0x0b;
reply[8] = 0x21; reply[9] = 0x80; reply[10] = 0x03; reply[11] = 0x00;
reply[12] = 0x02; reply[13] = 0x00; reply[14] = 0x01;
if (SendPeapPacket(e, reply, sizeof(reply)))
{
if (e->RecvLastCode == RADIUS_CODE_ACCESS_ACCEPT)
{
ret = true;
}
}
}
}
}
}
FreeBuf(buf);
}
}
}
return ret;
}
// send PEAP-MSCHAPv2 auth request
bool PeapClientSendMsChapv2AuthRequest(EAP_CLIENT *eap)
{
bool ret = false;
UINT num_retry = 0;
if (eap == NULL)
{
return false;
}
if (StartPeapClient(eap))
{
if (StartPeapSslClient(eap))
{
EAP_MESSAGE recv_msg;
EAP_MESSAGE send_msg;
if (GetRecvPeapMessage(eap, &recv_msg) && recv_msg.Type == EAP_TYPE_IDENTITY)
{
LABEL_RETRY:
num_retry++;
if (num_retry >= 10)
{
return false;
}
Zero(&send_msg, sizeof(send_msg));
send_msg.Type = EAP_TYPE_IDENTITY;
send_msg.Len = Endian16(5 + StrLen(eap->Username));
Copy(send_msg.Data, eap->Username, StrLen(eap->Username));
if (SendPeapPacket(eap, &send_msg, 5 + StrLen(eap->Username)) &&
GetRecvPeapMessage(eap, &recv_msg))
{
LABEL_RETRY2:
num_retry++;
if (num_retry >= 10)
{
return false;
}
if (recv_msg.Type == EAP_TYPE_MS_AUTH &&
((EAP_MSCHAPV2_GENERAL *)&recv_msg)->Chap_Opcode == EAP_MSCHAPV2_OP_CHALLENGE)
{
EAP_MSCHAPV2_CHALLENGE *svr_challenge = (EAP_MSCHAPV2_CHALLENGE *)&recv_msg;
Copy(&eap->MsChapV2Challenge, svr_challenge, sizeof(EAP_MSCHAPV2_CHALLENGE));
ret = true;
eap->PeapMode = true;
}
else if (recv_msg.Type == EAP_TYPE_IDENTITY)
{
UCHAR *rd = ((UCHAR *)&recv_msg);
if (rd[4] == 0x01 && rd[8] == 0x21 && rd[9] == 0x80 &&
rd[10] == 0x03 && rd[11] == 0x00 && rd[12] == 0x02 &&
rd[13] == 0x00)
{
if (rd[14] == 0x02)
{
// Fail
return false;
}
}
goto LABEL_RETRY;
}
else
{
EAP_MESSAGE nak;
Zero(&nak, sizeof(nak));
nak.Type = EAP_TYPE_LEGACY_NAK;
nak.Data[0] = EAP_TYPE_MS_AUTH;
if (SendPeapPacket(eap, &nak, 6) &&
GetRecvPeapMessage(eap, &recv_msg))
{
goto LABEL_RETRY2;
}
}
}
}
}
}
return ret;
}
// Send a PEAP packet (encrypted)
bool SendPeapRawPacket(EAP_CLIENT *e, UCHAR *peap_data, UINT peap_size)
{
LIST *fragments = NULL;
bool ret = false;
BUF *buf = NULL;
UINT i;
UINT num;
bool send_empty = false;
bool include_len = false;
if (e == NULL)
{
return false;
}
// divide into 1024 bytes
buf = NewBuf();
// size
if ((peap_size + 6 + 2) >= 256)
{
WriteBufInt(buf, peap_size);
include_len = true;
}
// data
WriteBuf(buf, peap_data, peap_size);
if (peap_data == NULL)
{
send_empty = true;
}
SeekBufToBegin(buf);
fragments = NewListFast(NULL);
for (num = 0;;num++)
{
UCHAR tmp[200];
EAP_PEAP *send_peap_message;
UINT sz;
sz = ReadBuf(buf, tmp, sizeof(tmp));
if (sz == 0)
{
break;
}
// add header
send_peap_message = ZeroMalloc(sizeof(EAP_PEAP) + sz);
send_peap_message->Code = EAP_CODE_RESPONSE;
send_peap_message->Id = e->LastRecvEapId + num;
send_peap_message->Len = Endian16((UINT)(((UINT)sizeof(EAP_PEAP) + (UINT)sz)));
send_peap_message->Type = EAP_TYPE_PEAP;
send_peap_message->TlsFlags = 0;
if (num == 0 && include_len)
{
send_peap_message->TlsFlags |= EAP_TLS_FLAGS_LEN;
}
if (ReadBufRemainSize(buf) != 0)
{
send_peap_message->TlsFlags |= EAP_TLS_FLAGS_MORE_FRAGMENTS;
}
Copy(((UCHAR *)send_peap_message) + sizeof(EAP_PEAP), tmp, sz);
Add(fragments, MemToBuf(send_peap_message, sizeof(EAP_PEAP) + sz));
Free(send_peap_message);
}
if (num == 0 && send_empty)
{
Add(fragments, MemToBuf("\0", 1));
}
// send each of packets
for (i = 0;i < LIST_NUM(fragments);i++)
{
BUF *b = LIST_DATA(fragments, i);
RADIUS_AVP *eap_avp;
RADIUS_PACKET *response_packet;
RADIUS_PACKET *send_packet = NewRadiusPacket(RADIUS_CODE_ACCESS_REQUEST, e->NextRadiusPacketId++);
EapSetRadiusGeneralAttributes(send_packet, e);
if (e->LastStateSize != 0)
{
Add(send_packet->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_STATE, 0, 0,
e->LastState, e->LastStateSize));
}
if (send_empty == false)
{
eap_avp = NewRadiusAvp(RADIUS_ATTRIBUTE_EAP_MESSAGE, 0, 0, b->Buf, b->Size);
}
else
{
EAP_PEAP empty_peap;
Zero(&empty_peap, sizeof(empty_peap));
empty_peap.Code = EAP_CODE_RESPONSE;
empty_peap.Id = e->LastRecvEapId;
empty_peap.Len = Endian16(sizeof(EAP_PEAP));
empty_peap.Type = EAP_TYPE_PEAP;
eap_avp = NewRadiusAvp(RADIUS_ATTRIBUTE_EAP_MESSAGE, 0, 0, &empty_peap, sizeof(EAP_PEAP));
}
Add(send_packet->AvpList, eap_avp);
response_packet = EapSendPacketAndRecvResponse(e, send_packet);
if (response_packet != NULL)
{
e->RecvLastCode = response_packet->Code;
if (response_packet->Parse_EapMessage != NULL && response_packet->Parse_EapMessage_DataSize >= sizeof(EAP_PEAP))
{
// Received SSL stream
EAP_PEAP *peap_msg = (EAP_PEAP *)response_packet->Parse_EapMessage;
if (peap_msg->Type == EAP_TYPE_PEAP)
{
if (peap_msg->TlsFlags & EAP_TLS_FLAGS_LEN)
{
UINT total_size = READ_UINT(((UCHAR *)peap_msg) + sizeof(EAP_PEAP));
if (total_size <= (response_packet->Parse_EapMessage_DataSize - sizeof(EAP_PEAP) - sizeof(UINT)))
{
WriteFifo(e->SslPipe->RawIn->SendFifo, ((UCHAR *)peap_msg) + sizeof(EAP_PEAP) + sizeof(UINT), total_size);
}
}
else
{
WriteFifo(e->SslPipe->RawIn->SendFifo, ((UCHAR *)peap_msg) + sizeof(EAP_PEAP),
response_packet->Parse_EapMessage_DataSize - sizeof(EAP_PEAP));
}
}
}
}
FreeRadiusPacket(send_packet);
FreeRadiusPacket(response_packet);
}
FreeBuf(buf);
if (fragments != NULL)
{
for (i = 0;i < LIST_NUM(fragments);i++)
{
BUF *b = LIST_DATA(fragments, i);
FreeBuf(b);
}
ReleaseList(fragments);
}
SyncSslPipe(e->SslPipe);
return ret;
}
// Send an encrypted message of PEAP
bool SendPeapPacket(EAP_CLIENT *e, void *msg, UINT msg_size)
{
bool ret = false;
FIFO *send_fifo;
FIFO *recv_fifo;
BUF *buf;
EAP_MESSAGE tmpmsg;
if (e == NULL || msg == NULL || msg_size == 0)
{
return false;
}
if (e->SslPipe == NULL)
{
return false;
}
send_fifo = e->SslPipe->RawOut->RecvFifo;
recv_fifo = e->SslPipe->RawIn->SendFifo;
Zero(&tmpmsg, sizeof(tmpmsg));
Copy(&tmpmsg, msg, MIN(msg_size, sizeof(EAP_MESSAGE)));
WriteFifo(e->SslPipe->SslInOut->SendFifo, &tmpmsg.Type, msg_size - 4);
SyncSslPipe(e->SslPipe);
buf = ReadFifoAll(send_fifo);
while (true)
{
ret = SendPeapRawPacket(e, buf->Buf, buf->Size);
FreeBuf(buf);
if (send_fifo->size == 0)
{
break;
}
buf = ReadFifoAll(send_fifo);
}
return !e->SslPipe->IsDisconnected;
}
// Start a PEAP SSL client
bool StartPeapSslClient(EAP_CLIENT *e)
{
bool ret = false;
FIFO *send_fifo;
FIFO *recv_fifo;
BUF *buf;
if (e == NULL)
{
return false;
}
if (e->SslPipe != NULL)
{
return false;
}
e->SslPipe = NewSslPipe(false, NULL, NULL, NULL);
send_fifo = e->SslPipe->RawOut->RecvFifo;
recv_fifo = e->SslPipe->RawIn->SendFifo;
SyncSslPipe(e->SslPipe);
buf = ReadFifoAll(send_fifo);
while (true)
{
ret = SendPeapRawPacket(e, buf->Buf, buf->Size);
FreeBuf(buf);
if (send_fifo->size == 0)
{
break;
}
buf = ReadFifoAll(send_fifo);
}
SendPeapRawPacket(e, NULL, 0);
return !e->SslPipe->IsDisconnected;
}
// Get a received PEAP message (unencrypted)
bool GetRecvPeapMessage(EAP_CLIENT *e, EAP_MESSAGE *msg)
{
BUF *b;
bool ret = false;
if (e == NULL)
{
return false;
}
if (e->SslPipe == NULL)
{
return false;
}
b = ReadFifoAll(e->SslPipe->SslInOut->RecvFifo);
if (b->Size >= 1)
{
Zero(msg, sizeof(EAP_MESSAGE));
msg->Len = Endian16(b->Size + 4);
Copy(&msg->Type, b->Buf, MIN(b->Size, 1501));
ret = true;
}
FreeBuf(b);
return ret;
}
// Start a PEAP client
bool StartPeapClient(EAP_CLIENT *e)
{
bool ret = false;
RADIUS_PACKET *request1 = NULL;
RADIUS_PACKET *response1 = NULL;
RADIUS_PACKET *request2 = NULL;
RADIUS_PACKET *response2 = NULL;
EAP_MESSAGE *eap1 = NULL;
EAP_MESSAGE *eap2 = NULL;
if (e == NULL)
{
return false;
}
if (e->SslPipe != NULL)
{
return false;
}
request1 = NewRadiusPacket(RADIUS_CODE_ACCESS_REQUEST, e->NextRadiusPacketId++);
EapSetRadiusGeneralAttributes(request1, e);
eap1 = ZeroMalloc(sizeof(EAP_MESSAGE));
eap1->Code = EAP_CODE_RESPONSE;
eap1->Id = e->LastRecvEapId;
eap1->Len = Endian16(StrLen(e->Username) + 5);
eap1->Type = EAP_TYPE_IDENTITY;
Copy(eap1->Data, e->Username, StrLen(e->Username));
Add(request1->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_EAP_MESSAGE, 0, 0, eap1, StrLen(e->Username) + 5));
response1 = EapSendPacketAndRecvResponse(e, request1);
if (response1 != NULL)
{
if (response1->Parse_EapMessage_DataSize != 0 && response1->Parse_EapMessage != NULL)
{
EAP_MESSAGE *eap = response1->Parse_EapMessage;
if (eap->Code == EAP_CODE_REQUEST)
{
if (eap->Type != EAP_TYPE_PEAP)
{
// Unsupported auth type. Request PEAP.
request2 = NewRadiusPacket(RADIUS_CODE_ACCESS_REQUEST, e->NextRadiusPacketId++);
EapSetRadiusGeneralAttributes(request2, e);
if (response1->Parse_StateSize != 0)
{
Add(request2->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_STATE, 0, 0,
response1->Parse_State, response1->Parse_StateSize));
}
eap2 = ZeroMalloc(sizeof(EAP_MESSAGE));
eap2->Code = EAP_CODE_RESPONSE;
eap2->Id = e->LastRecvEapId;
eap2->Len = Endian16(6);
eap2->Type = EAP_TYPE_LEGACY_NAK;
eap2->Data[0] = EAP_TYPE_PEAP;
Add(request2->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_EAP_MESSAGE, 0, 0, eap2, 6));
response2 = EapSendPacketAndRecvResponse(e, request2);
if (response2 != NULL && response2->Parse_EapMessage_DataSize != 0 && response2->Parse_EapMessage != NULL)
{
eap = response2->Parse_EapMessage;
if (eap->Code == EAP_CODE_REQUEST && eap->Type == EAP_TYPE_PEAP)
{
goto LABEL_PARSE_PEAP;
}
}
}
else
{
EAP_PEAP *peap;
LABEL_PARSE_PEAP:
peap = (EAP_PEAP *)eap;
if (peap->TlsFlags == 0x20)
{
ret = true;
}
}
}
}
}
FreeRadiusPacket(request1);
FreeRadiusPacket(request2);
FreeRadiusPacket(response1);
FreeRadiusPacket(response2);
Free(eap1);
Free(eap2);
return ret;
}
// Set RADIUS general attributes
void EapSetRadiusGeneralAttributes(RADIUS_PACKET *r, EAP_CLIENT *e)
{
UINT ui;
char *str;
if (r == NULL || e == NULL)
{
return;
}
ui = Endian32(2);
Add(r->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_SERVICE_TYPE, 0, 0, &ui, sizeof(UINT)));
ui = Endian32(1);
Add(r->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_FRAMED_PROTOCOL, 0, 0, &ui, sizeof(UINT)));
ui = Endian32(5);
Add(r->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_NAS_PORT_TYPE, 0, 0, &ui, sizeof(UINT)));
if (IsEmptyStr(e->CalledStationStr) == false)
{
Add(r->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_CALLED_STATION_ID, 0, 0, e->CalledStationStr, StrLen(e->CalledStationStr)));
}
Add(r->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_CALLING_STATION_ID, 0, 0, e->ClientIpStr, StrLen(e->ClientIpStr)));
Add(r->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_TUNNEL_CLIENT_ENDPOINT, 0, 0, e->ClientIpStr, StrLen(e->ClientIpStr)));
Add(r->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_USER_NAME, 0, 0, e->Username, StrLen(e->Username)));
Add(r->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_NAS_ID, 0, 0, CEDAR_SERVER_STR, StrLen(CEDAR_SERVER_STR)));
if (IsEmptyStr(e->In_VpnProtocolState) == false)
{
Add(r->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_PROXY_STATE, 0, 0, e->In_VpnProtocolState, StrLen(e->In_VpnProtocolState)));
}
ui = Endian32(2);
Add(r->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_VENDOR_SPECIFIC, RADIUS_VENDOR_MICROSOFT,
RADIUS_MS_NETWORK_ACCESS_SERVER_TYPE, &ui, sizeof(UINT)));
ui = Endian32(RADIUS_VENDOR_MICROSOFT);
Add(r->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_VENDOR_SPECIFIC, RADIUS_VENDOR_MICROSOFT,
RADIUS_MS_RAS_VENDOR, &ui, sizeof(UINT)));
str = "MSRASV5.20";
Add(r->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_VENDOR_SPECIFIC, RADIUS_VENDOR_MICROSOFT,
RADIUS_MS_VERSION, str, StrLen(str)));
str = "{5DC53D72-9815-4E97-AC91-339BAFEA6C48}";
Add(r->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_VENDOR_SPECIFIC, RADIUS_VENDOR_MICROSOFT,
RADIUS_MS_RAS_CORRELATION, str, StrLen(str)));
str = "MSRASV5.20";
Add(r->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_VENDOR_SPECIFIC, RADIUS_VENDOR_MICROSOFT,
RADIUS_MS_RAS_CLIENT_VERSION, str, StrLen(str)));
str = "MSRASV5.20";
Add(r->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_VENDOR_SPECIFIC, RADIUS_VENDOR_MICROSOFT,
RADIUS_MS_RAS_CLIENT_NAME, str, StrLen(str)));
}
// Send a MSCHAPv2 client auth response1
bool EapClientSendMsChapv2AuthClientResponse(EAP_CLIENT *e, UCHAR *client_response, UCHAR *client_challenge)
{
bool ret = false;
RADIUS_PACKET *request1 = NULL;
RADIUS_PACKET *response1 = NULL;
RADIUS_PACKET *request2 = NULL;
RADIUS_PACKET *response2 = NULL;
EAP_MSCHAPV2_RESPONSE *eap1 = NULL;
EAP_MSCHAPV2_SUCCESS_CLIENT *eap2 = NULL;
if (e == NULL || client_response == NULL || client_challenge == NULL)
{
return false;
}
request1 = NewRadiusPacket(RADIUS_CODE_ACCESS_REQUEST, e->NextRadiusPacketId++);
EapSetRadiusGeneralAttributes(request1, e);
if (e->LastStateSize != 0)
{
Add(request1->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_STATE, 0, 0,
e->LastState, e->LastStateSize));
}
eap1 = ZeroMalloc(sizeof(EAP_MSCHAPV2_RESPONSE));
eap1->Code = EAP_CODE_RESPONSE;
eap1->Id = e->NextEapId++;
eap1->Len = Endian16(59 + StrLen(e->Username));
eap1->Type = EAP_TYPE_MS_AUTH;
eap1->Chap_Opcode = EAP_MSCHAPV2_OP_RESPONSE;
eap1->Chap_Id = e->MsChapV2Challenge.Chap_Id;
eap1->Chap_Len = Endian16(54 + StrLen(e->Username));
eap1->Chap_ValueSize = 49;
Copy(eap1->Chap_PeerChallenge, client_challenge, 16);
Copy(eap1->Chap_NtResponse, client_response, 24);
Copy(eap1->Chap_Name, e->Username, MIN(StrLen(e->Username), 255));
Add(request1->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_EAP_MESSAGE, 0, 0, eap1, StrLen(e->Username) + 59));
response1 = EapSendPacketAndRecvResponse(e, request1);
if (response1 != NULL)
{
if (response1->Parse_EapMessage_DataSize != 0 && response1->Parse_EapMessage != NULL)
{
EAP_MESSAGE *eap = response1->Parse_EapMessage;
if (eap->Code == EAP_CODE_REQUEST)
{
if (eap->Type == EAP_TYPE_MS_AUTH)
{
if (((EAP_MSCHAPV2_GENERAL *)eap)->Chap_Opcode != EAP_MSCHAPV2_OP_SUCCESS)
{
// Auth fail
}
else
{
// Auth ok
EAP_MSCHAPV2_SUCCESS_SERVER *eaps = (EAP_MSCHAPV2_SUCCESS_SERVER *)eap;
if (StartWith(eaps->Message, "S="))
{
BUF *buf = StrToBin(eaps->Message + 2);
if (buf && buf->Size == 20)
{
Copy(&e->MsChapV2Success, eaps, sizeof(EAP_MSCHAPV2_SUCCESS_SERVER));
Copy(e->ServerResponse, buf->Buf, 20);
if (true)
{
// Send the final packet
request2 = NewRadiusPacket(RADIUS_CODE_ACCESS_REQUEST, e->NextRadiusPacketId++);
EapSetRadiusGeneralAttributes(request2, e);
if (e->LastStateSize != 0)
{
Add(request2->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_STATE, 0, 0,
e->LastState, e->LastStateSize));
}
eap2 = ZeroMalloc(sizeof(EAP_MSCHAPV2_SUCCESS_CLIENT));
eap2->Code = EAP_CODE_RESPONSE;
eap2->Id = e->NextEapId++;
eap2->Len = Endian16(6);
eap2->Type = EAP_TYPE_MS_AUTH;
eap2->Chap_Opcode = EAP_MSCHAPV2_OP_SUCCESS;
Add(request2->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_EAP_MESSAGE, 0, 0, eap2, 6));
response2 = EapSendPacketAndRecvResponse(e, request2);
if (response2 != NULL)
{
if (response2->Code == RADIUS_CODE_ACCESS_ACCEPT)
{
ret = true;
}
}
}
}
FreeBuf(buf);
}
}
}
}
}
}
FreeRadiusPacket(request1);
FreeRadiusPacket(request2);
FreeRadiusPacket(response1);
FreeRadiusPacket(response2);
Free(eap1);
Free(eap2);
return ret;
}
// Send a MSCHAPv2 client auth request
bool EapClientSendMsChapv2AuthRequest(EAP_CLIENT *e)
{
bool ret = false;
RADIUS_PACKET *request1 = NULL;
RADIUS_PACKET *response1 = NULL;
RADIUS_PACKET *request2 = NULL;
RADIUS_PACKET *response2 = NULL;
EAP_MESSAGE *eap1 = NULL;
EAP_MESSAGE *eap2 = NULL;
if (e == NULL)
{
return false;
}
request1 = NewRadiusPacket(RADIUS_CODE_ACCESS_REQUEST, e->NextRadiusPacketId++);
EapSetRadiusGeneralAttributes(request1, e);
eap1 = ZeroMalloc(sizeof(EAP_MESSAGE));
eap1->Code = EAP_CODE_RESPONSE;
eap1->Id = e->NextEapId++;
eap1->Len = Endian16(StrLen(e->Username) + 5);
eap1->Type = EAP_TYPE_IDENTITY;
Copy(eap1->Data, e->Username, StrLen(e->Username));
Add(request1->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_EAP_MESSAGE, 0, 0, eap1, StrLen(e->Username) + 5));
response1 = EapSendPacketAndRecvResponse(e, request1);
if (response1 != NULL)
{
if (response1->Parse_EapMessage_DataSize != 0 && response1->Parse_EapMessage != NULL)
{
EAP_MESSAGE *eap = response1->Parse_EapMessage;
if (eap->Code == EAP_CODE_REQUEST)
{
if (eap->Type != EAP_TYPE_MS_AUTH)
{
// Unsupported auth type. Request MS-CHAP-v2.
request2 = NewRadiusPacket(RADIUS_CODE_ACCESS_REQUEST, e->NextRadiusPacketId++);
EapSetRadiusGeneralAttributes(request2, e);
if (response1->Parse_StateSize != 0)
{
Add(request2->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_STATE, 0, 0,
response1->Parse_State, response1->Parse_StateSize));
}
eap2 = ZeroMalloc(sizeof(EAP_MESSAGE));
eap2->Code = EAP_CODE_RESPONSE;
eap2->Id = e->NextEapId++;
eap2->Len = Endian16(6);
eap2->Type = EAP_TYPE_LEGACY_NAK;
eap2->Data[0] = EAP_TYPE_MS_AUTH;
Add(request2->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_EAP_MESSAGE, 0, 0, eap2, 6));
response2 = EapSendPacketAndRecvResponse(e, request2);
if (response2 != NULL && response2->Parse_EapMessage_DataSize != 0 && response2->Parse_EapMessage != NULL)
{
eap = response2->Parse_EapMessage;
if (eap->Code == EAP_CODE_REQUEST && eap->Type == EAP_TYPE_MS_AUTH)
{
goto LABEL_PARSE_EAP;
}
}
}
else
{
EAP_MSCHAPV2_GENERAL *ms_g;
LABEL_PARSE_EAP:
ms_g = (EAP_MSCHAPV2_GENERAL *)eap;
if (ms_g->Chap_Opcode == EAP_MSCHAPV2_OP_CHALLENGE)
{
EAP_MSCHAPV2_CHALLENGE *ms_c = (EAP_MSCHAPV2_CHALLENGE *)eap;
if (ms_c->Chap_ValueSize == 16)
{
Copy(&e->MsChapV2Challenge, ms_c, sizeof(EAP_MSCHAPV2_CHALLENGE));
ret = true;
}
}
}
}
}
}
FreeRadiusPacket(request1);
FreeRadiusPacket(request2);
FreeRadiusPacket(response1);
FreeRadiusPacket(response2);
Free(eap1);
Free(eap2);
return ret;
}
// Send a packet and recv a response
RADIUS_PACKET *EapSendPacketAndRecvResponse(EAP_CLIENT *e, RADIUS_PACKET *r)
{
SOCKSET set;
UINT64 giveup_tick = 0;
UINT64 next_send_tick = 0;
bool select_inited = false;
bool free_r = false;
RADIUS_PACKET *ret = NULL;
if (e == NULL || r == NULL)
{
return NULL;
}
ClearBuf(e->PEAP_CurrentReceivingMsg);
e->PEAP_CurrentReceivingTotalSize = 0;
InitSockSet(&set);
AddSockSet(&set, e->UdpSock);
while (true)
{
UINT64 now = Tick64();
UINT wait_time = INFINITE;
bool is_finish = false;
if (giveup_tick == 0)
{
giveup_tick = now + (UINT64)e->GiveupTimeout;
}
if (giveup_tick <= now)
{
break;
}
if (select_inited)
{
UINT num_error = 0;
while (true)
{
IP from_ip;
UINT from_port;
UINT size;
UCHAR *tmp = e->TmpBuffer;
size = RecvFrom(e->UdpSock, &from_ip, &from_port, tmp, sizeof(e->TmpBuffer));
if (size == 0 && e->UdpSock->IgnoreRecvErr == false)
{
// UDP socket error
is_finish = true;
break;
}
else if (size == SOCK_LATER)
{
break;
}
if (size == 0 && e->UdpSock->IgnoreRecvErr)
{
num_error++;
if (num_error >= 100)
{
is_finish = true;
break;
}
}
// Receive a response packet
if (size != SOCK_LATER && size >= 1)
{
if (CmpIpAddr(&from_ip, &e->ServerIp) == 0 && from_port == e->ServerPort)
{
RADIUS_PACKET *rp = ParseRadiusPacket(tmp, size);
if (rp != NULL)
{
RADIUS_AVP *eap_msg = GetRadiusAvp(rp, RADIUS_ATTRIBUTE_EAP_MESSAGE);
RADIUS_AVP *vlan_avp = GetRadiusAvp(rp, RADIUS_ATTRIBUTE_VLAN_ID);
RADIUS_AVP *framed_interface_id_avp = GetRadiusAvp(rp, RADIUS_ATTRIBUTE_FRAMED_INTERFACE_ID);
if (eap_msg != NULL)
{
e->LastRecvEapId = ((EAP_MESSAGE *)(eap_msg->Data))->Id;
}
if (framed_interface_id_avp != NULL)
{
// FRAMED_INTERFACE_ID
char tmp_str[64];
UCHAR mac_address[6];
Zero(tmp_str, sizeof(tmp_str));
Copy(tmp_str, framed_interface_id_avp->Data, MIN(framed_interface_id_avp->DataSize, sizeof(tmp_str) - 1));
if (StrToMac(mac_address, tmp_str))
{
Copy(e->LastRecvVirtualMacAddress, mac_address, 6);
}
}
if (vlan_avp != NULL)
{
// VLAN ID
UINT vlan_id = 0;
char tmp[32];
Zero(tmp, sizeof(tmp));
Copy(tmp, vlan_avp->Data, MIN(vlan_avp->DataSize, sizeof(tmp) - 1));
vlan_id = ToInt(tmp);
e->LastRecvVLanId = vlan_id;
}
// Validate the received packet
if (rp->Parse_EapAuthMessagePos != 0 && rp->Parse_AuthenticatorPos != 0)
{
UCHAR *tmp_buffer = Clone(tmp, size);
UCHAR auth1[16];
UCHAR auth2[16];
Copy(auth1, &tmp_buffer[rp->Parse_EapAuthMessagePos], 16);
Zero(&tmp_buffer[rp->Parse_EapAuthMessagePos], 16);
Copy(&tmp_buffer[rp->Parse_AuthenticatorPos], r->Authenticator, 16);
HMacMd5(auth2, e->SharedSecret, StrLen(e->SharedSecret),
tmp_buffer, size);
if (Cmp(auth1, auth2, 16) == 0)
{
bool send_ack_packet = false;
// ok
Copy(e->LastState, rp->Parse_State, rp->Parse_StateSize);
e->LastStateSize = rp->Parse_StateSize;
if (rp->Parse_EapMessage_DataSize != 0 && rp->Parse_EapMessage != NULL)
{
EAP_MESSAGE *eap_msg = (EAP_MESSAGE *)rp->Parse_EapMessage;
if (eap_msg->Type == EAP_TYPE_PEAP)
{
EAP_PEAP *peap_message = (EAP_PEAP *)eap_msg;
if (peap_message->TlsFlags & EAP_TLS_FLAGS_MORE_FRAGMENTS || e->PEAP_CurrentReceivingTotalSize != 0)
{
// more fragments: reply ack
RADIUS_PACKET *ack_packet = NewRadiusPacket(RADIUS_CODE_ACCESS_REQUEST, e->NextRadiusPacketId++);
EAP_PEAP *ack_msg = ZeroMalloc(sizeof(EAP_PEAP));
EapSetRadiusGeneralAttributes(ack_packet, e);
if (e->LastStateSize != 0)
{
Add(ack_packet->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_STATE, 0, 0,
e->LastState, e->LastStateSize));
}
ack_msg->Code = EAP_CODE_RESPONSE;
ack_msg->Id = e->LastRecvEapId;
ack_msg->Len = Endian16(6);
ack_msg->Type = EAP_TYPE_PEAP;
ack_msg->TlsFlags = 0;
Add(ack_packet->AvpList, NewRadiusAvp(RADIUS_ATTRIBUTE_EAP_MESSAGE, 0, 0,
ack_msg, sizeof(EAP_PEAP)));
next_send_tick = 0;
if (free_r)
{
FreeRadiusPacket(r);
}
r = ack_packet;
free_r = true;
Free(ack_msg);
send_ack_packet = true;
if (e->PEAP_CurrentReceivingTotalSize == 0)
{
if (peap_message->TlsFlags & EAP_TLS_FLAGS_LEN)
{
if (Endian16(peap_message->Len) >= 9)
{
UINT total_size = READ_UINT(((UCHAR *)peap_message) + sizeof(EAP_PEAP));
if (total_size < 65536)
{
if (rp->Parse_EapMessage_DataSize >= 1)
{
e->PEAP_CurrentReceivingTotalSize = total_size;
WriteBuf(e->PEAP_CurrentReceivingMsg,
((UCHAR *)peap_message),
rp->Parse_EapMessage_DataSize);
}
}
}
}
}
else
{
if ((!(peap_message->TlsFlags & EAP_TLS_FLAGS_LEN)) &&
rp->Parse_EapMessage_DataSize >= sizeof(EAP_PEAP))
{
WriteBuf(e->PEAP_CurrentReceivingMsg,
((UCHAR *)peap_message) + sizeof(EAP_PEAP),
rp->Parse_EapMessage_DataSize - sizeof(EAP_PEAP));
if (e->PEAP_CurrentReceivingTotalSize <= e->PEAP_CurrentReceivingMsg->Size)
{
// all fragmented segments are arrived
send_ack_packet = false;
is_finish = true;
Free(rp->Parse_EapMessage);
rp->Parse_EapMessage = Clone(e->PEAP_CurrentReceivingMsg->Buf, e->PEAP_CurrentReceivingMsg->Size);
rp->Parse_EapMessage_DataSize = e->PEAP_CurrentReceivingMsg->Size;
}
}
}
}
}
}
if (send_ack_packet == false)
{
ret = rp;
}
}
Free(tmp_buffer);
}
if (ret != NULL)
{
is_finish = true;
break;
}
else
{
FreeRadiusPacket(rp);
}
}
}
}
}
}
if (is_finish)
{
break;
}
if (next_send_tick == 0 || next_send_tick <= now)
{
next_send_tick = now + (UINT64)e->ResendTimeout;
if (EapSendPacket(e, r) == false)
{
is_finish = true;
}
}
wait_time = MIN(wait_time, (UINT)(next_send_tick - now));
wait_time = MIN(wait_time, (UINT)(giveup_tick - now));
wait_time = MAX(wait_time, 1);
if (is_finish)
{
break;
}
Select(&set, wait_time, NULL, NULL);
select_inited = true;
}
if (free_r)
{
FreeRadiusPacket(r);
}
return ret;
}
// Send a RADIUS packet
bool EapSendPacket(EAP_CLIENT *e, RADIUS_PACKET *r)
{
BUF *b;
bool ret = false;
if (e == NULL || r == NULL)
{
return false;
}
b = GenerateRadiusPacket(r, e->SharedSecret);
if (b != NULL)
{
UINT r = SendTo(e->UdpSock, &e->ServerIp, e->ServerPort, b->Buf, b->Size);
if (!(r == 0 && e->UdpSock->IgnoreSendErr == false))
{
ret = true;
}
FreeBuf(b);
}
return ret;
}
// New EAP client
EAP_CLIENT *NewEapClient(IP *server_ip, UINT server_port, char *shared_secret, UINT resend_timeout, UINT giveup_timeout, char *client_ip_str, char *username, char *hubname)
{
EAP_CLIENT *e;
if (server_ip == NULL)
{
return NULL;
}
if (resend_timeout == 0)
{
resend_timeout = RADIUS_RETRY_INTERVAL;
}
if (giveup_timeout == 0)
{
giveup_timeout = RADIUS_RETRY_TIMEOUT;
}
e = ZeroMalloc(sizeof(EAP_CLIENT));
e->Ref = NewRef();
e->NextRadiusPacketId = 1;
e->UdpSock = NewUDPEx(0, IsIP6(server_ip));
Copy(&e->ServerIp, server_ip, sizeof(IP));
e->ServerPort = server_port;
e->ResendTimeout = resend_timeout;
e->GiveupTimeout = giveup_timeout;
StrCpy(e->SharedSecret, sizeof(e->SharedSecret), shared_secret);
StrCpy(e->CalledStationStr, sizeof(e->CalledStationStr), hubname);
StrCpy(e->ClientIpStr, sizeof(e->ClientIpStr), client_ip_str);
StrCpy(e->Username, sizeof(e->Username), username);
e->LastRecvEapId = 0;
e->PEAP_CurrentReceivingMsg = NewBuf();
return e;
}
// Free a EAP client
void ReleaseEapClient(EAP_CLIENT *e)
{
if (e == NULL)
{
return;
}
if (Release(e->Ref) == 0)
{
CleanupEapClient(e);
}
}
void CleanupEapClient(EAP_CLIENT *e)
{
if (e == NULL)
{
return;
}
Disconnect(e->UdpSock);
ReleaseSock(e->UdpSock);
FreeSslPipe(e->SslPipe);
FreeBuf(e->PEAP_CurrentReceivingMsg);
Free(e);
}
// New RADIUS AVP value
RADIUS_AVP *NewRadiusAvp(UCHAR type, UINT vendor_id, UCHAR vendor_code, void *data, UINT size)
{
RADIUS_AVP *p = ZeroMalloc(sizeof(RADIUS_AVP));
p->Type = type;
p->VendorId = vendor_id;
p->VendorCode = vendor_code;
p->DataSize = (UCHAR)size;
Copy(p->Data, data, (UCHAR)size);
if (size >= 256)
{
Debug("!! size = %u\n", size);
}
return p;
}
// New RADIUS packet
RADIUS_PACKET *NewRadiusPacket(UCHAR code, UCHAR packet_id)
{
RADIUS_PACKET *r = ZeroMalloc(sizeof(RADIUS_PACKET));
r->Code = code;
r->PacketId = packet_id;
r->AvpList = NewListFast(NULL);
return r;
}
// Get RADIUS AVP
RADIUS_AVP *GetRadiusAvp(RADIUS_PACKET *p, UCHAR type)
{
UINT i;
if (p == NULL)
{
return NULL;
}
for (i = 0;i < LIST_NUM(p->AvpList);i++)
{
RADIUS_AVP *avp = LIST_DATA(p->AvpList, i);
if (avp->Type == type)
{
return avp;
}
}
return NULL;
}
// Free a RADIUS packet
void FreeRadiusPacket(RADIUS_PACKET *p)
{
UINT i;
if (p == NULL)
{
return;
}
if (p->AvpList != NULL)
{
for (i = 0;i < LIST_NUM(p->AvpList);i++)
{
RADIUS_AVP *a = LIST_DATA(p->AvpList, i);
Free(a);
}
ReleaseList(p->AvpList);
}
Free(p->Parse_EapMessage);
Free(p);
}
// Generate a RADIUS packet
BUF *GenerateRadiusPacket(RADIUS_PACKET *p, char *shared_secret)
{
BUF *b;
UINT i;
UCHAR zero16[16];
UINT len_pos = 0;
UINT eap_auth_pos = 0;
bool exist_eap_msg = false;
bool exist_eap_auth = false;
if (p == NULL)
{
return NULL;
}
Zero(zero16, sizeof(zero16));
// Add EAP message auth packet
for (i = 0;i < LIST_NUM(p->AvpList);i++)
{
RADIUS_AVP *a = (RADIUS_AVP *)LIST_DATA(p->AvpList, i);
if (a->Type == RADIUS_ATTRIBUTE_EAP_MESSAGE)
{
exist_eap_msg = true;
}
if (a->Type == RADIUS_ATTRIBUTE_EAP_AUTHENTICATOR)
{
exist_eap_auth = true;
}
}
if (exist_eap_msg && exist_eap_auth == false)
{
RADIUS_AVP *a = NewRadiusAvp(RADIUS_ATTRIBUTE_EAP_AUTHENTICATOR, 0, 0, zero16, sizeof(zero16));
Add(p->AvpList, a);
}
if (IsZero(p->Authenticator, 16))
{
UCHAR rand16[16];
Rand(rand16, sizeof(rand16));
Copy(p->Authenticator, rand16, 16);
}
b = NewBuf();
WriteBufChar(b, p->Code);
WriteBufChar(b, p->PacketId);
len_pos = b->Current;
WriteBufShort(b, 0);
WriteBuf(b, p->Authenticator, 16);
for (i = 0;i < LIST_NUM(p->AvpList);i++)
{
RADIUS_AVP *a = (RADIUS_AVP *)LIST_DATA(p->AvpList, i);
WriteBufChar(b, a->Type);
if (a->Type != RADIUS_ATTRIBUTE_VENDOR_SPECIFIC)
{
WriteBufChar(b, (UCHAR)((UINT)a->DataSize + 2));
if (a->Type == RADIUS_ATTRIBUTE_EAP_AUTHENTICATOR)
{
eap_auth_pos = b->Current;
if (a->DataSize == 16)
{
Zero(a->Data, sizeof(a->Data));
}
}
WriteBuf(b, a->Data, a->DataSize);
}
else
{
WriteBufChar(b, (UCHAR)((UINT)a->DataSize + 8));
WriteBufInt(b, a->VendorId);
WriteBufChar(b, a->VendorCode);
WriteBufChar(b, (UCHAR)((UINT)a->DataSize + 2));
WriteBuf(b, a->Data, a->DataSize);
}
}
WRITE_USHORT(((UCHAR *)b->Buf) + len_pos, b->Size);
if (eap_auth_pos != 0)
{
UCHAR eap_auth[16];
HMacMd5(eap_auth, shared_secret, StrLen(shared_secret), b->Buf, b->Size);
Copy(((UCHAR *)b->Buf) + eap_auth_pos, eap_auth, 16);
}
SeekBufToBegin(b);
return b;
}
// Parse a RADIUS packet
RADIUS_PACKET *ParseRadiusPacket(void *data, UINT size)
{
RADIUS_PACKET *p = NULL;
BUF *buf = NULL;
USHORT len;
UCHAR auth[16];
if (data == NULL || size == 0)
{
return NULL;
}
p = ZeroMalloc(sizeof(RADIUS_PACKET));
p->AvpList = NewListFast(NULL);
buf = MemToBuf(data, size);
// Code
p->Code = ReadBufChar(buf);
p->PacketId = ReadBufChar(buf);
len = ReadBufShort(buf);
p->Parse_AuthenticatorPos = buf->Current;
if (ReadBuf(buf, auth, 16) != 16)
{
goto LABEL_ERROR;
}
if ((UINT)len < 20)
{
goto LABEL_ERROR;
}
if ((UINT)len > buf->Size)
{
goto LABEL_ERROR;
}
else if ((UINT)len < buf->Size)
{
buf->Size = len;
}
while (true)
{
RADIUS_AVP a;
UCHAR uc;
UINT data_size;
Zero(&a, sizeof(a));
if (ReadBuf(buf, &a.Type, 1) == 0)
{
break;
}
if (a.Type != RADIUS_ATTRIBUTE_VENDOR_SPECIFIC)
{
if (ReadBuf(buf, &uc, 1) == 0)
{
break;
}
data_size = (UINT)uc;
if (data_size < 2)
{
goto LABEL_ERROR;
}
data_size -= 2;
a.DataSize = (UCHAR)data_size;
if (a.Type == RADIUS_ATTRIBUTE_EAP_AUTHENTICATOR && a.DataSize == 16)
{
p->Parse_EapAuthMessagePos = buf->Current;
}
if (ReadBuf(buf, a.Data, a.DataSize) != a.DataSize)
{
goto LABEL_ERROR;
}
if (a.Type == RADIUS_ATTRIBUTE_EAP_MESSAGE && a.DataSize >= 5)
{
UINT sz_tmp = Endian16(((EAP_MESSAGE *)a.Data)->Len);
if (sz_tmp >= 5 && sz_tmp <= a.DataSize)
{
if (p->Parse_EapMessage == NULL)
{
EAP_MESSAGE *eap = Clone(a.Data, a.DataSize);
p->Parse_EapMessage_DataSize = sz_tmp;
p->Parse_EapMessage = eap;
}
}
}
}
else
{
if (ReadBuf(buf, &uc, 1) == 0)
{
break;
}
data_size = (UINT)uc;
if (data_size < 8)
{
goto LABEL_ERROR;
}
data_size -= 8;
a.VendorId = ReadBufInt(buf);
a.VendorCode = ReadBufChar(buf);
if (ReadBuf(buf, &uc, 1) == 0)
{
break;
}
if (((UINT)uc - 2) != data_size)
{
goto LABEL_ERROR;
}
a.DataSize = (UINT)data_size;
if (ReadBuf(buf, a.Data, a.DataSize) != a.DataSize)
{
goto LABEL_ERROR;
}
}
Add(p->AvpList, Clone(&a, sizeof(RADIUS_AVP)));
}
FreeBuf(buf);
if (true)
{
UINT num, i;
RADIUS_AVP *avp = GetRadiusAvp(p, RADIUS_ATTRIBUTE_STATE);
if (avp != NULL)
{
Copy(p->Parse_State, avp->Data, avp->DataSize);
p->Parse_StateSize = avp->DataSize;
}
num = 0;
for (i = 0;i < LIST_NUM(p->AvpList);i++)
{
RADIUS_AVP *avp = LIST_DATA(p->AvpList, i);
if (avp->Type == RADIUS_ATTRIBUTE_EAP_MESSAGE)
{
num++;
}
}
if (num >= 2)
{
// Reassemble multiple EAP messages
BUF *b = NewBuf();
for (i = 0;i < LIST_NUM(p->AvpList);i++)
{
RADIUS_AVP *avp = LIST_DATA(p->AvpList, i);
if (avp->Type == RADIUS_ATTRIBUTE_EAP_MESSAGE)
{
WriteBuf(b, avp->Data, avp->DataSize);
}
}
if (Endian16(((EAP_MESSAGE *)b->Buf)->Len) <= b->Size)
{
if (p->Parse_EapMessage != NULL)
{
Free(p->Parse_EapMessage);
}
p->Parse_EapMessage_DataSize = b->Size;
p->Parse_EapMessage_DataSize = MIN(p->Parse_EapMessage_DataSize, 1500);
p->Parse_EapMessage = Clone(b->Buf, p->Parse_EapMessage_DataSize);
}
FreeBuf(b);
}
}
return p;
LABEL_ERROR:
FreeRadiusPacket(p);
FreeBuf(buf);
return NULL;
}
////////// Classical implementation
// Attempts Radius authentication (with specifying retry interval and multiple server)
bool RadiusLogin(CONNECTION *c, char *server, UINT port, UCHAR *secret, UINT secret_size, wchar_t *username, char *password, UINT interval, UCHAR *mschap_v2_server_response_20,
RADIUS_LOGIN_OPTION *opt, char *hubname)
{
UCHAR random[MD5_SIZE];
UCHAR id;
BUF *encrypted_password = NULL;
BUF *user_name = NULL;
//IP ip;
bool ret = false;
TOKEN_LIST *token;
UINT i;
LIST *ip_list;
IPC_MSCHAP_V2_AUTHINFO mschap;
bool is_mschap;
char client_ip_str[MAX_SIZE];
RADIUS_LOGIN_OPTION opt_dummy;
static UINT packet_id = 0;
// Validate arguments
if (server == NULL || port == 0 || (secret_size != 0 && secret == NULL) || username == NULL || password == NULL)
{
return false;
}
if (opt == NULL)
{
Zero(&opt_dummy, sizeof(opt_dummy));
opt = &opt_dummy;
}
opt->Out_VLanId = 0;
Zero(client_ip_str, sizeof(client_ip_str));
if (c != NULL && c->FirstSock != NULL)
{
IPToStr(client_ip_str, sizeof(client_ip_str), &c->FirstSock->RemoteIP);
}
// Parse the MS-CHAP v2 authentication data
Zero(&mschap, sizeof(mschap));
is_mschap = ParseAndExtractMsChapV2InfoFromPassword(&mschap, password);
if (is_mschap && mschap.MsChapV2_EapClient != NULL)
{
// Try the EAP authentication for RADIUS first
EAP_CLIENT *eap = mschap.MsChapV2_EapClient;
if (IsEmptyStr(opt->In_VpnProtocolState) == false)
{
StrCpy(eap->In_VpnProtocolState, sizeof(eap->In_VpnProtocolState), opt->In_VpnProtocolState);
}
if (eap->PeapMode == false)
{
ret = EapClientSendMsChapv2AuthClientResponse(eap, mschap.MsChapV2_ClientResponse,
mschap.MsChapV2_ClientChallenge);
}
else
{
ret = PeapClientSendMsChapv2AuthClientResponse(eap, mschap.MsChapV2_ClientResponse,
mschap.MsChapV2_ClientChallenge);
}
if (ret)
{
Copy(mschap_v2_server_response_20, eap->ServerResponse, 20);
if (opt->In_CheckVLanId)
{
opt->Out_VLanId = eap->LastRecvVLanId;
}
Copy(opt->Out_VirtualMacAddress, eap->LastRecvVirtualMacAddress, 6);
return true;
}
else
{
return false;
}
}
// Split the server into tokens
token = ParseToken(server, " ,;\t");
// Get the IP address of the server
ip_list = NewListFast(NULL);
for(i = 0; i < token->NumTokens; i++)
{
IP *tmp_ip = Malloc(sizeof(IP));
if (GetIP(tmp_ip, token->Token[i]))
{
Add(ip_list, tmp_ip);
}
else if (GetIPEx(tmp_ip, token->Token[i], true))
{
Add(ip_list, tmp_ip);
}
else
{
Free(tmp_ip);
}
}
FreeToken(token);
if(LIST_NUM(ip_list) == 0)
{
ReleaseList(ip_list);
return false;
}
// Random number generation
Rand(random, sizeof(random));
// ID generation
id = (UCHAR)(packet_id % 254 + 1);
packet_id++;
if (is_mschap == false)
{
// Encrypt the password
encrypted_password = RadiusEncryptPassword(password, random, secret, secret_size);
if (encrypted_password == NULL)
{
// Encryption failure
// Release the ip_list
for(i = 0; i < LIST_NUM(ip_list); i++)
{
IP *tmp_ip = LIST_DATA(ip_list, i);
Free(tmp_ip);
}
ReleaseList(ip_list);
return false;
}
}
// Generate the user name packet
user_name = RadiusCreateUserName(username);
if (user_name != NULL)
{
// Generate a password packet
BUF *user_password = (is_mschap ? NULL : RadiusCreateUserPassword(encrypted_password->Buf, encrypted_password->Size));
BUF *nas_id;
if (IsEmptyStr(opt->NasId))
{
nas_id = RadiusCreateNasId(CEDAR_SERVER_STR);
}
else
{
nas_id = RadiusCreateNasId(opt->NasId);
}
if (is_mschap || user_password != NULL)
{
UINT64 start;
UINT64 next_send_time;
UCHAR tmp[MAX_SIZE];
UINT recv_buf_size = 32768;
UCHAR *recv_buf = MallocEx(recv_buf_size, true);
// Generate an UDP packet
BUF *p = NewBuf();
UCHAR type = 1;
SOCK *sock;
USHORT sz = 0;
UINT pos = 0;
BOOL *finish = ZeroMallocEx(sizeof(BOOL) * LIST_NUM(ip_list), true);
Zero(tmp, sizeof(tmp));
WriteBuf(p, &type, 1);
WriteBuf(p, &id, 1);
WriteBuf(p, &sz, 2);
WriteBuf(p, random, 16);
WriteBuf(p, user_name->Buf, user_name->Size);
if (is_mschap == false)
{
UINT ui;
// PAP
WriteBuf(p, user_password->Buf, user_password->Size);
WriteBuf(p, nas_id->Buf, nas_id->Size);
// Service-Type
ui = Endian32(2);
RadiusAddValue(p, RADIUS_ATTRIBUTE_SERVICE_TYPE, 0, 0, &ui, sizeof(ui));
// NAS-Port-Type
ui = Endian32(5);
RadiusAddValue(p, RADIUS_ATTRIBUTE_NAS_PORT_TYPE, 0, 0, &ui, sizeof(ui));
// Tunnel-Type
ui = Endian32(1);
RadiusAddValue(p, RADIUS_ATTRIBUTE_TUNNEL_TYPE, 0, 0, &ui, sizeof(ui));
// Tunnel-Medium-Type
ui = Endian32(1);
RadiusAddValue(p, RADIUS_ATTRIBUTE_TUNNEL_MEDIUM_TYPE, 0, 0, &ui, sizeof(ui));
// Called-Station-ID - VPN Hub Name
if (IsEmptyStr(hubname) == false)
{
RadiusAddValue(p, RADIUS_ATTRIBUTE_CALLED_STATION_ID, 0, 0, hubname, StrLen(hubname));
}
// Calling-Station-Id
RadiusAddValue(p, RADIUS_ATTRIBUTE_CALLING_STATION_ID, 0, 0, client_ip_str, StrLen(client_ip_str));
// Tunnel-Client-Endpoint
RadiusAddValue(p, RADIUS_ATTRIBUTE_TUNNEL_CLIENT_ENDPOINT, 0, 0, client_ip_str, StrLen(client_ip_str));
}
else
{
// MS-CHAP v2
static UINT session_id = 0;
USHORT us;
UINT ui;
char *ms_ras_version = "MSRASV5.20";
UCHAR ms_chapv2_response[50];
// Acct-Session-Id
us = Endian16(session_id % 254 + 1);
session_id++;
RadiusAddValue(p, RADIUS_ATTRIBUTE_ACCT_SESSION_ID, 0, 0, &us, sizeof(us));
// NAS-IP-Address
if (c != NULL && c->FirstSock != NULL && c->FirstSock->IPv6 == false)
{
ui = IPToUINT(&c->FirstSock->LocalIP);
RadiusAddValue(p, RADIUS_ATTRIBUTE_NAS_IP, 0, 0, &ui, sizeof(ui));
}
// Service-Type
ui = Endian32(2);
RadiusAddValue(p, RADIUS_ATTRIBUTE_SERVICE_TYPE, 0, 0, &ui, sizeof(ui));
// MS-RAS-Vendor
ui = Endian32(RADIUS_VENDOR_MICROSOFT);
RadiusAddValue(p, RADIUS_ATTRIBUTE_VENDOR_SPECIFIC, RADIUS_VENDOR_MICROSOFT, RADIUS_MS_RAS_VENDOR, &ui, sizeof(ui));
// MS-RAS-Version
RadiusAddValue(p, RADIUS_ATTRIBUTE_VENDOR_SPECIFIC, RADIUS_VENDOR_MICROSOFT, RADIUS_MS_VERSION, ms_ras_version, StrLen(ms_ras_version));
// NAS-Port-Type
ui = Endian32(5);
RadiusAddValue(p, RADIUS_ATTRIBUTE_NAS_PORT_TYPE, 0, 0, &ui, sizeof(ui));
// Tunnel-Type
ui = Endian32(1);
RadiusAddValue(p, RADIUS_ATTRIBUTE_TUNNEL_TYPE, 0, 0, &ui, sizeof(ui));
// Tunnel-Medium-Type
ui = Endian32(1);
RadiusAddValue(p, RADIUS_ATTRIBUTE_TUNNEL_MEDIUM_TYPE, 0, 0, &ui, sizeof(ui));
// Called-Station-ID - VPN Hub Name
if (IsEmptyStr(hubname) == false)
{
RadiusAddValue(p, RADIUS_ATTRIBUTE_CALLED_STATION_ID, 0, 0, hubname, StrLen(hubname));
}
// Calling-Station-Id
RadiusAddValue(p, RADIUS_ATTRIBUTE_CALLING_STATION_ID, 0, 0, client_ip_str, StrLen(client_ip_str));
// Tunnel-Client-Endpoint
RadiusAddValue(p, RADIUS_ATTRIBUTE_TUNNEL_CLIENT_ENDPOINT, 0, 0, client_ip_str, StrLen(client_ip_str));
// MS-RAS-Client-Version
RadiusAddValue(p, RADIUS_ATTRIBUTE_VENDOR_SPECIFIC, RADIUS_VENDOR_MICROSOFT, RADIUS_MS_RAS_CLIENT_VERSION, ms_ras_version, StrLen(ms_ras_version));
// MS-RAS-Client-Name
RadiusAddValue(p, RADIUS_ATTRIBUTE_VENDOR_SPECIFIC, RADIUS_VENDOR_MICROSOFT, RADIUS_MS_RAS_CLIENT_NAME, client_ip_str, StrLen(client_ip_str));
// MS-CHAP-Challenge
RadiusAddValue(p, RADIUS_ATTRIBUTE_VENDOR_SPECIFIC, RADIUS_VENDOR_MICROSOFT, RADIUS_MS_CHAP_CHALLENGE, mschap.MsChapV2_ServerChallenge, sizeof(mschap.MsChapV2_ServerChallenge));
// MS-CHAP2-Response
Zero(ms_chapv2_response, sizeof(ms_chapv2_response));
Copy(ms_chapv2_response + 2, mschap.MsChapV2_ClientChallenge, 16);
Copy(ms_chapv2_response + 2 + 16 + 8, mschap.MsChapV2_ClientResponse, 24);
RadiusAddValue(p, RADIUS_ATTRIBUTE_VENDOR_SPECIFIC, RADIUS_VENDOR_MICROSOFT, RADIUS_MS_CHAP2_RESPONSE, ms_chapv2_response, sizeof(ms_chapv2_response));
// NAS-ID
WriteBuf(p, nas_id->Buf, nas_id->Size);
}
if (IsEmptyStr(opt->In_VpnProtocolState) == false)
{
// Proxy state as protocol details
RadiusAddValue(p, RADIUS_ATTRIBUTE_PROXY_STATE, 0, 0, opt->In_VpnProtocolState, StrLen(opt->In_VpnProtocolState));
}
SeekBuf(p, 0, 0);
WRITE_USHORT(((UCHAR *)p->Buf) + 2, (USHORT)p->Size);
// Create a socket
sock = NewUDPEx(0, IsIP6(LIST_DATA(ip_list, pos)));
// Transmission process start
start = Tick64();
if(interval < RADIUS_RETRY_INTERVAL)
{
interval = RADIUS_RETRY_INTERVAL;
}
else if(interval > RADIUS_RETRY_TIMEOUT)
{
interval = RADIUS_RETRY_TIMEOUT;
}
next_send_time = start + (UINT64)interval;
while (true)
{
UINT server_port;
UINT recv_size;
//IP server_ip;
SOCKSET set;
UINT64 now;
SEND_RETRY:
//SendTo(sock, &ip, port, p->Buf, p->Size);
SendTo(sock, LIST_DATA(ip_list, pos), port, p->Buf, p->Size);
Debug("send to host:%u\n", pos);
next_send_time = Tick64() + (UINT64)interval;
RECV_RETRY:
now = Tick64();
if (next_send_time <= now)
{
// Switch the host to refer
pos++;
pos = pos % LIST_NUM(ip_list);
goto SEND_RETRY;
}
if ((start + RADIUS_RETRY_TIMEOUT) < now)
{
// Time-out
break;
}
InitSockSet(&set);
AddSockSet(&set, sock);
Select(&set, (UINT)(next_send_time - now), NULL, NULL);
recv_size = RecvFrom(sock, LIST_DATA(ip_list, pos), &server_port, recv_buf, recv_buf_size);
if (recv_size == 0)
{
Debug("Radius recv_size 0\n");
finish[pos] = TRUE;
for(i = 0; i < LIST_NUM(ip_list); i++)
{
if(finish[i] == FALSE)
{
// Switch the host to refer
pos++;
pos = pos % LIST_NUM(ip_list);
goto SEND_RETRY;
}
}
// Failure
break;
}
else if (recv_size == SOCK_LATER)
{
// Waiting
goto RECV_RETRY;
}
else
{
// Check such as the IP address
if (/*Cmp(&server_ip, &ip, sizeof(IP)) != 0 || */server_port != port)
{
goto RECV_RETRY;
}
// Success
if (recv_buf[0] == 2)
{
LIST *o;
BUF *buf = NewBufFromMemory(recv_buf, recv_size);
ret = true;
if (is_mschap && mschap_v2_server_response_20 != NULL)
{
// Cutting corners Zurukko
UCHAR signature[] = {0x1A, 0x33, 0x00, 0x00, 0x01, 0x37, 0x1A, 0x2D, 0x00, 0x53, 0x3D, };
UINT i = SearchBin(recv_buf, 0, recv_buf_size, signature, sizeof(signature));
if (i == INFINITE || ((i + sizeof(signature) + 40) > recv_buf_size))
{
ret = false;
}
else
{
char tmp[MAX_SIZE];
BUF *b;
Zero(tmp, sizeof(tmp));
Copy(tmp, recv_buf + i + sizeof(signature), 40);
b = StrToBin(tmp);
if (b != NULL && b->Size == 20)
{
WHERE;
Copy(mschap_v2_server_response_20, b->Buf, 20);
}
else
{
WHERE;
ret = false;
}
FreeBuf(b);
}
}
o = RadiusParseOptions(buf);
if (o != NULL)
{
DHCP_OPTION *framed_interface_id_option = GetDhcpOption(o, RADIUS_ATTRIBUTE_FRAMED_INTERFACE_ID);
if (framed_interface_id_option != NULL)
{
char tmp_str[64];
UCHAR mac_address[6];
Zero(tmp_str, sizeof(tmp_str));
Copy(tmp_str, framed_interface_id_option->Data, MIN(framed_interface_id_option->Size, sizeof(tmp_str) - 1));
if (StrToMac(mac_address, tmp_str))
{
Copy(opt->Out_VirtualMacAddress, mac_address, 6);
}
}
if (opt->In_CheckVLanId)
{
DHCP_OPTION *vlan_option = GetDhcpOption(o, RADIUS_ATTRIBUTE_VLAN_ID);
if (vlan_option != NULL)
{
UINT vlan_id = 0;
char tmp[32];
Zero(tmp, sizeof(tmp));
Copy(tmp, vlan_option->Data, MIN(vlan_option->Size, sizeof(tmp) - 1));
vlan_id = ToInt(tmp);
opt->Out_VLanId = vlan_id;
}
}
FreeDhcpOptions(o);
}
FreeBuf(buf);
}
break;
}
}
Free(finish);
// Release the socket
ReleaseSock(sock);
FreeBuf(p);
FreeBuf(user_password);
Free(recv_buf);
}
FreeBuf(nas_id);
FreeBuf(user_name);
}
// Release the ip_list
for(i = 0; i < LIST_NUM(ip_list); i++)
{
IP *tmp_ip = LIST_DATA(ip_list, i);
Free(tmp_ip);
}
ReleaseList(ip_list);
// Release the memory
FreeBuf(encrypted_password);
return ret;
}
// Parse RADIUS attributes
LIST *RadiusParseOptions(BUF *b)
{
LIST *o;
UCHAR code;
UCHAR id;
USHORT len;
UCHAR auth[16];
// Validate arguments
if (b == NULL)
{
return NULL;
}
o = NewList(NULL);
ReadBuf(b, &code, 1);
ReadBuf(b, &id, 1);
len = 0;
ReadBuf(b, &len, 2);
len = Endian16(len);
ReadBuf(b, auth, 16);
while (true)
{
UCHAR attribute_id;
UCHAR size;
UCHAR data[256];
DHCP_OPTION *d;
if (ReadBuf(b, &attribute_id, 1) != 1)
{
break;
}
if (ReadBuf(b, &size, 1) != 1)
{
break;
}
if (size <= 2)
{
break;
}
size -= 2;
if (ReadBuf(b, data, size) != size)
{
break;
}
d = ZeroMalloc(sizeof(DHCP_OPTION));
d->Id = attribute_id;
d->Size = size;
d->Data = Clone(data, d->Size);
Add(o, d);
}
return o;
}
// Adding Attributes
void RadiusAddValue(BUF *b, UCHAR t, UINT v, UCHAR vt, void *data, UINT size)
{
UINT len;
// Validate arguments
if (b == NULL || (data == NULL && size != 0))
{
return;
}
// type
WriteBufChar(b, t);
// length
len = 2 + size;
if (t == 26)
{
len += 6;
}
WriteBufChar(b, (UCHAR)len);
if (t != 26)
{
// value
WriteBuf(b, data, size);
}
else
{
// vendor
WriteBufInt(b, v);
// vendor type
WriteBufChar(b, vt);
// length2
len = size + 2;
WriteBufChar(b, (UCHAR)len);
// value
WriteBuf(b, data, size);
}
}
// Create a password attribute for Radius
BUF *RadiusCreateUserPassword(void *data, UINT size)
{
BUF *b;
UCHAR code, sz;
// Validate arguments
if (size != 0 && data == NULL || size >= 253)
{
return NULL;
}
b = NewBuf();
code = 2;
sz = 2 + (UCHAR)size;
WriteBuf(b, &code, 1);
WriteBuf(b, &sz, 1);
WriteBuf(b, data, size);
return b;
}
// Generate an ID attribute of Nas
BUF *RadiusCreateNasId(char *name)
{
BUF *b;
UCHAR code, size;
// Validate arguments
if (name == NULL)
{
return NULL;
}
if (StrLen(name) == 0 || StrLen(name) >= 128)
{
return NULL;
}
b = NewBuf();
code = 32;
size = 2 + (UCHAR)StrLen(name);
WriteBuf(b, &code, 1);
WriteBuf(b, &size, 1);
WriteBuf(b, name, StrLen(name));
return b;
}
// Create a user name attribute for Radius
BUF *RadiusCreateUserName(wchar_t *username)
{
BUF *b;
UCHAR code, size;
UCHAR utf8[254];
// Validate arguments
if (username == NULL)
{
return NULL;
}
// Convert the user name to a Unicode string
UniToStr(utf8, sizeof(utf8), username);
utf8[253] = 0;
b = NewBuf();
code = 1;
size = 2 + (UCHAR)StrLen(utf8);
WriteBuf(b, &code, 1);
WriteBuf(b, &size, 1);
WriteBuf(b, utf8, StrLen(utf8));
return b;
}
// Encrypt the password for the Radius
BUF *RadiusEncryptPassword(char *password, UCHAR *random, UCHAR *secret, UINT secret_size)
{
UINT n, i;
BUF *buf;
UCHAR c[16][16]; // Result
UCHAR b[16][16]; // Result
UCHAR p[16][16]; // Password
// Validate arguments
if (password == NULL || random == NULL || (secret_size != 0 && secret == NULL))
{
return NULL;
}
if (StrLen(password) > 256)
{
// Password is too long
return NULL;
}
// Initialize
Zero(c, sizeof(c));
Zero(p, sizeof(p));
Zero(b, sizeof(b));
// Divide the password per 16 characters
Copy(p, password, StrLen(password));
// Calculate the number of blocks
n = StrLen(password) / 16;
if ((StrLen(password) % 16) != 0)
{
n++;
}
// Encryption processing
for (i = 0;i < n;i++)
{
// Calculation of b[i]
UINT j;
BUF *tmp = NewBuf();
WriteBuf(tmp, secret, secret_size);
if (i == 0)
{
WriteBuf(tmp, random, 16);
}
else
{
WriteBuf(tmp, c[i - 1], 16);
}
Md5(b[i], tmp->Buf, tmp->Size);
FreeBuf(tmp);
// Calculation of c[i]
for (j = 0;j < 16;j++)
{
c[i][j] = p[i][j] ^ b[i][j];
}
}
// Return the results
buf = NewBuf();
WriteBuf(buf, c, n * 16);
return buf;
}
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