766 lines
19 KiB
C++
766 lines
19 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2000, Microsoft Corp. All rights reserved.
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//
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// FILE
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//
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// basecamp.cpp
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//
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// SYNOPSIS
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//
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// Defines the class BaseCampHostBase.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include <ias.h>
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#include <extension.h>
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#include <basecamp.h>
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#include <memory>
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//////////
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// The offset between the UNIX and NT epochs.
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//////////
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const DWORDLONG UNIX_EPOCH = 116444736000000000ui64;
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/////////
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// Convert a single attribute from IAS to BaseCamp format.
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// Returns (dst + 1) if successful, (dst) otherwise.
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/////////
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PRADIUS_ATTRIBUTE
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WINAPI
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ConvertToBaseCampAttribute(
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IN PIASATTRIBUTE src,
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IN PRADIUS_ATTRIBUTE dst
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) throw ()
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{
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/////////
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// Convert the attribute ID.
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/////////
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if (src->dwId < 256)
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{
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// If it's a radius standard attribute, then use 'as is'.
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dst->dwAttrType = src->dwId;
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}
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else
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{
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// Map internal attributes.
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switch (src->dwId)
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{
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case IAS_ATTRIBUTE_CLIENT_IP_ADDRESS:
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dst->dwAttrType = ratSrcIPAddress;
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break;
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case IAS_ATTRIBUTE_CLIENT_UDP_PORT:
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dst->dwAttrType = ratSrcPort;
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break;
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case IAS_ATTRIBUTE_NT4_ACCOUNT_NAME:
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dst->dwAttrType = ratStrippedUserName;
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break;
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case IAS_ATTRIBUTE_FULLY_QUALIFIED_USER_NAME:
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dst->dwAttrType = ratFQUserName;
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break;
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case IAS_ATTRIBUTE_NP_NAME:
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dst->dwAttrType = ratPolicyName;
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break;
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default:
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// No mapping exists.
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return dst;
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}
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}
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/////////
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// Convert the attribute value.
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/////////
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switch (src->Value.itType)
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{
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case IASTYPE_BOOLEAN:
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case IASTYPE_INTEGER:
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case IASTYPE_ENUM:
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{
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dst->fDataType = rdtInteger;
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dst->cbDataLength = sizeof(DWORD);
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dst->dwValue = src->Value.Integer;
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++dst;
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break;
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}
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case IASTYPE_INET_ADDR:
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{
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dst->fDataType = rdtAddress;
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dst->cbDataLength = sizeof(DWORD);
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dst->dwValue = src->Value.InetAddr;
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++dst;
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break;
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}
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case IASTYPE_STRING:
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{
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IASAttributeAnsiAlloc(src);
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if (src->Value.String.pszAnsi)
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{
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dst->fDataType = rdtString;
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dst->cbDataLength = strlen(src->Value.String.pszAnsi) + 1;
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dst->lpValue = src->Value.String.pszAnsi;
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++dst;
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}
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break;
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}
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case IASTYPE_OCTET_STRING:
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case IASTYPE_PROV_SPECIFIC:
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{
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dst->fDataType = rdtString;
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dst->cbDataLength = src->Value.OctetString.dwLength;
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dst->lpValue = (PCSTR)src->Value.OctetString.lpValue;
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++dst;
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break;
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}
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case IASTYPE_UTC_TIME:
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{
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DWORDLONG val;
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// Move in the high DWORD.
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val = src->Value.UTCTime.dwHighDateTime;
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val <<= 32;
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// Move in the low DWORD.
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val |= src->Value.UTCTime.dwLowDateTime;
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// Convert to the UNIX epoch.
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val -= UNIX_EPOCH;
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// Convert to seconds.
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val /= 10000000;
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dst->fDataType = rdtTime;
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dst->cbDataLength = sizeof(DWORD);
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dst->dwValue = (DWORD)val;
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++dst;
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break;
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}
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}
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return dst;
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}
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/////////
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// Converts a request object to an array of BaseCamp attributes.
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/////////
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VOID
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WINAPI
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ConvertRequestToBaseCampAttributes(
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IN IASRequest& request,
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IN BOOL inbound,
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OUT PRADIUS_ATTRIBUTE* ppAttrs
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)
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{
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/////////
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// Determine the packetCode.
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/////////
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DWORD packetCode = 0;
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if (!inbound)
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{
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// For outbound requests we look at the response.
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switch (request.get_Response())
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{
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case IAS_RESPONSE_ACCESS_ACCEPT:
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packetCode = 2;
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break;
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case IAS_RESPONSE_ACCESS_REJECT:
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packetCode = 3;
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break;
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case IAS_RESPONSE_ACCOUNTING:
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packetCode = 5;
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break;
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case IAS_RESPONSE_ACCESS_CHALLENGE:
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packetCode = 11;
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break;
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}
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}
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if (!packetCode)
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{
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// If we made it here, either this is an inbound request or we
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// haven't made a decision yet on an outbound request.
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switch (request.get_Request())
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{
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case IAS_REQUEST_ACCESS_REQUEST:
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packetCode = 1;
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break;
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case IAS_REQUEST_ACCOUNTING:
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packetCode = 4;
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break;
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}
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}
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///////
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// Determine which attributes to convert based on the packetCode.
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///////
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DWORD always, never;
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switch (packetCode)
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{
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case 1: // Access-Request
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always = IAS_RECVD_FROM_CLIENT | IAS_RECVD_FROM_PROTOCOL;
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never = IAS_INCLUDE_IN_RESPONSE;
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break;
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case 2: // Access-Accept
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always = IAS_INCLUDE_IN_ACCEPT;
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never = IAS_RECVD_FROM_CLIENT |
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IAS_INCLUDE_IN_REJECT | IAS_INCLUDE_IN_CHALLENGE;
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break;
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case 3: // Access-Reject
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always = IAS_INCLUDE_IN_REJECT;
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never = IAS_RECVD_FROM_CLIENT |
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IAS_INCLUDE_IN_ACCEPT | IAS_INCLUDE_IN_CHALLENGE;
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break;
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case 4: // Accounting-Request
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always = IAS_RECVD_FROM_CLIENT | IAS_RECVD_FROM_PROTOCOL;
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never = IAS_INCLUDE_IN_RESPONSE;
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break;
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case 5: // Accounting-Response
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always = IAS_INCLUDE_IN_RESPONSE;
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never = IAS_RECVD_FROM_CLIENT;
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break;
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case 11: // Access-Challenge.
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always = IAS_INCLUDE_IN_CHALLENGE;
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never = IAS_RECVD_FROM_CLIENT |
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IAS_INCLUDE_IN_ACCEPT | IAS_INCLUDE_IN_REJECT;
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break;
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default:
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always = 0;
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never = 0;
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}
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// Get the packet header (won't be present for RAS).
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PIASATTRIBUTE header = IASPeekAttribute(
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request,
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IAS_ATTRIBUTE_CLIENT_PACKET_HEADER,
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IASTYPE_OCTET_STRING
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);
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// Allocate memory for the converted attributes. We need six extra elements
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// for derived attributes and the terminator.
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DWORD numAttrs = request.GetAttributeCount();
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*ppAttrs = (PRADIUS_ATTRIBUTE)
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CoTaskMemAlloc((numAttrs + 6UL) * sizeof(RADIUS_ATTRIBUTE));
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if (*ppAttrs == NULL) { _com_issue_error(E_OUTOFMEMORY); }
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// Cursor into the attribute array.
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PRADIUS_ATTRIBUTE dst = *ppAttrs;
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// Packet code.
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dst->dwAttrType = ratCode;
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dst->fDataType = rdtInteger;
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dst->cbDataLength = sizeof(DWORD);
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dst->dwValue = packetCode;
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++dst;
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// Authentication provider.
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dst->dwAttrType = ratProvider;
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dst->fDataType = rdtInteger;
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dst->cbDataLength = sizeof(DWORD);
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PIASATTRIBUTE providerType = IASPeekAttribute(
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request,
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IAS_ATTRIBUTE_PROVIDER_TYPE,
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IASTYPE_ENUM
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);
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if (providerType == 0)
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{
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// most of the time, the absence of the provider type is used
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// for rapNone
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dst->dwValue = rapNone;
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}
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else
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{
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switch(providerType->Value.Integer)
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{
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case IAS_PROVIDER_NONE:
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{
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dst->dwValue = rapNone;
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break;
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}
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case IAS_PROVIDER_WINDOWS:
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{
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dst->dwValue = rapWindowsNT;
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break;
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}
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case IAS_PROVIDER_RADIUS_PROXY:
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{
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dst->dwValue = rapProxy;
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break;
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}
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default:
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{
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// should never be here
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dst->dwValue = rapUnknown;
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}
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}
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}
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++dst;
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// Identifier
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if (header)
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{
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dst->dwAttrType = ratIdentifier;
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dst->fDataType = rdtInteger;
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dst->cbDataLength = sizeof(DWORD);
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dst->dwValue = *(PBYTE)(header->Value.OctetString.lpValue + 1);
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++dst;
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}
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// Check for a Chap-Challenge.
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PIASATTRIBUTE challenge = IASPeekAttribute(
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request,
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RADIUS_ATTRIBUTE_CHAP_CHALLENGE,
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IASTYPE_OCTET_STRING
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);
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if (challenge)
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{
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// Use the Chap-Challenge if present ...
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dst->dwAttrType = ratAuthenticator;
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dst->fDataType = rdtString;
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dst->cbDataLength = challenge->Value.OctetString.dwLength;
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dst->lpValue = (const char*)challenge->Value.OctetString.lpValue;
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++dst;
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}
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else if (header)
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{
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// ... otherwise use the Request Authenticator.
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dst->dwAttrType = ratAuthenticator;
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dst->fDataType = rdtString;
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dst->cbDataLength = 16;
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dst->lpValue = (const char*)header->Value.OctetString.lpValue + 4;
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++dst;
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}
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// Get all the regular attributes from the request.
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USES_IAS_STACK_VECTOR();
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IASAttributeVectorOnStack(attrs, NULL, numAttrs);
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attrs.load(request);
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// Iterate through and convert each attribute.
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for (IASAttributeVector::iterator i = attrs.begin(); i != attrs.end(); ++i)
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{
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if ( (i->pAttribute->dwFlags & always) ||
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!(i->pAttribute->dwFlags & never ))
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{
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dst = ConvertToBaseCampAttribute(i->pAttribute, dst);
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}
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}
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// All done, so add the terminator.
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dst->dwAttrType = ratMinimum;
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dst->fDataType = rdtUnknown;
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dst->cbDataLength = 0;
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dst->lpValue = NULL;
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}
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/////////
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// Determines if an extension should only be loaded under NT4.
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/////////
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BOOL
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WINAPI
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IsNT4Only(
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PCWSTR path
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) throw ()
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{
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// Strip everything before the last backslash.
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const WCHAR* basename = wcsrchr(path, L'\\');
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if (basename == NULL)
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{
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basename = path;
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}
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else
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{
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++basename;
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}
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// Is this the authsam extension?
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return _wcsicmp(basename, L"AUTHSAM.DLL") == 0;
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}
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/////////
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// Free an array of BaseCamp attributes.
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/////////
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VOID
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WINAPI
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FreeBaseCampAttributes(
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IN PRADIUS_ATTRIBUTE ppAttrs
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) throw ()
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{
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CoTaskMemFree(ppAttrs);
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}
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///////
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// Store an array of BaseCamp attributes in a request.
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///////
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VOID
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WINAPI
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StoreBaseCampAttributes(
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IN IASRequest& request,
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IN const RADIUS_ATTRIBUTE* pAttrs
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)
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{
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// Set the flags based on the response.
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DWORD flags;
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if (request.get_Response() == IAS_RESPONSE_ACCESS_REJECT)
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{
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flags = IAS_INCLUDE_IN_REJECT;
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}
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else
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{
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flags = IAS_INCLUDE_IN_ACCEPT;
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}
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// Iterate through the attributes, convert, and store.
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const RADIUS_ATTRIBUTE* i;
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for (i = pAttrs; i->dwAttrType != ratMinimum; ++i)
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{
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IASAttribute attr(true);
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attr->dwFlags = flags;
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attr->dwId = i->dwAttrType;
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switch (i->fDataType)
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{
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case rdtAddress:
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{
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attr->Value.itType = IASTYPE_INET_ADDR;
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attr->Value.InetAddr = i->dwValue;
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break;
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}
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case rdtInteger:
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case rdtTime:
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{
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attr->Value.itType = IASTYPE_INTEGER;
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attr->Value.InetAddr = i->dwValue;
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break;
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}
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default:
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{
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attr.setOctetString(i->cbDataLength, (PBYTE)i->lpValue);
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}
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}
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attr.store(request);
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// CLASS
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//
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// OutAttributes
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//
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// DESCRIPTION
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//
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// Manages the RADIUS_ATTRIBUTE's returned by an extension.
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//
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///////////////////////////////////////////////////////////////////////////////
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class OutAttributes
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{
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public:
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OutAttributes(BaseCampExtension& ext) throw ()
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: owner(ext),attrs(NULL)
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{ }
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~OutAttributes() throw ()
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{ owner.freeAttrs(attrs); }
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operator bool() const throw ()
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{ return attrs != NULL; }
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PRADIUS_ATTRIBUTE* operator&() throw ()
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{ return &attrs; }
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operator const RADIUS_ATTRIBUTE*() const throw ()
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{ return attrs; }
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private:
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BaseCampExtension& owner;
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PRADIUS_ATTRIBUTE attrs;
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// Not implemented.
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OutAttributes(const OutAttributes&);
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OutAttributes& operator=(const OutAttributes&);
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};
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BaseCampHostBase::BaseCampHostBase(
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PCSTR friendlyName,
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PCWSTR registryKey,
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PCWSTR registryValue,
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BOOL inboundPacket,
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DWORD actions
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) throw ()
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: name(friendlyName),
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extensionsKey(registryKey),
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extensionsValue(registryValue),
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inbound(inboundPacket),
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allowedActions(actions),
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numExtensions(0),
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extensions(NULL)
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{
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}
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|
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STDMETHODIMP BaseCampHostBase::Initialize()
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{
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// Allocate an attribute for the Authentication-Type.
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DWORD error = IASAttributeAlloc(1, &authType);
|
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if (error != NO_ERROR) { return HRESULT_FROM_WIN32(error); }
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|
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// Initialize the attribute fields.
|
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authType->dwId = IAS_ATTRIBUTE_AUTHENTICATION_TYPE;
|
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authType->Value.itType = IASTYPE_ENUM;
|
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authType->Value.Enumerator = IAS_AUTH_CUSTOM;
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|
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DWORD status = NO_ERROR;
|
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HKEY hKey = NULL;
|
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do
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{
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// Open the registry key.
|
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status = RegOpenKeyW(
|
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HKEY_LOCAL_MACHINE,
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extensionsKey,
|
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&hKey
|
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);
|
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if (status != NO_ERROR) { break; }
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|
|
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// Allocate a buffer to hold the value.
|
|
DWORD type, length;
|
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status = RegQueryValueExW(
|
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hKey,
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extensionsValue,
|
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NULL,
|
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&type,
|
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NULL,
|
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&length
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);
|
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if (status != NO_ERROR) { break; }
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PBYTE data = (PBYTE)_alloca(length);
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|
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// Read the registry value.
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status = RegQueryValueExW(
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hKey,
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extensionsValue,
|
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NULL,
|
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&type,
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data,
|
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&length
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);
|
|
if (status != NO_ERROR) { break; }
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|
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// Make sure it's the right type.
|
|
if (type != REG_MULTI_SZ)
|
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{
|
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status = ERROR_INVALID_DATA;
|
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break;
|
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}
|
|
|
|
// Count the number of strings.
|
|
PCWSTR path;
|
|
for (path = (PCWSTR)data; *path; path += wcslen(path) + 1)
|
|
{
|
|
if (!IsNT4Only(path)) { ++numExtensions; }
|
|
}
|
|
|
|
// If there are no extensions, then we're done.
|
|
if (numExtensions == 0) { break; }
|
|
|
|
// Allocate memory to hold the extensions.
|
|
extensions = new (std::nothrow) BaseCampExtension[numExtensions];
|
|
if (extensions == NULL)
|
|
{
|
|
status = ERROR_NOT_ENOUGH_MEMORY;
|
|
break;
|
|
}
|
|
|
|
// Load the DLL's.
|
|
BaseCampExtension* ext = extensions;
|
|
for (path = (PCWSTR)data; *path; path += wcslen(path) + 1)
|
|
{
|
|
if (!IsNT4Only(path))
|
|
{
|
|
IASTracePrintf("Loading %s extension %S", name, path);
|
|
|
|
status = ext->load(path);
|
|
if (status != NO_ERROR)
|
|
{
|
|
break;
|
|
}
|
|
++ext;
|
|
}
|
|
}
|
|
|
|
} while (false);
|
|
|
|
// If we failed, shutdown.
|
|
if (status != NO_ERROR) { BaseCampHostBase::Shutdown(); }
|
|
|
|
// Close the registry.
|
|
if (hKey) { RegCloseKey(hKey); }
|
|
|
|
// If no extensions are registered, then it's not really an error.
|
|
if (status == ERROR_FILE_NOT_FOUND) { status = NO_ERROR; }
|
|
|
|
return HRESULT_FROM_WIN32(status);
|
|
}
|
|
|
|
STDMETHODIMP BaseCampHostBase::Shutdown()
|
|
{
|
|
numExtensions = 0;
|
|
|
|
delete[] extensions;
|
|
extensions = NULL;
|
|
|
|
authType.release();
|
|
|
|
return S_OK;
|
|
}
|
|
|
|
IASREQUESTSTATUS BaseCampHostBase::onSyncRequest(IRequest* pRequest) throw ()
|
|
{
|
|
// Short-circuit if there aren't any extensions,
|
|
if (numExtensions == 0) { return IAS_REQUEST_STATUS_CONTINUE; }
|
|
|
|
IASTracePrintf("%s processing request.", name);
|
|
|
|
// Array of converted attributes. These are at function scope so we can
|
|
// clean-up after an exception.
|
|
PRADIUS_ATTRIBUTE pAttrs = NULL;
|
|
|
|
// Default status is to continue.
|
|
IASREQUESTSTATUS retval = IAS_REQUEST_STATUS_CONTINUE;
|
|
|
|
try
|
|
{
|
|
IASRequest request(pRequest);
|
|
|
|
// Convert any VSAs to RADIUS wire format.
|
|
filter.radiusFromIAS(request);
|
|
|
|
// Convert request to an array of BaseCamp attributes.
|
|
ConvertRequestToBaseCampAttributes(
|
|
request,
|
|
inbound,
|
|
&pAttrs
|
|
);
|
|
|
|
// Extensions can only return an action for Access-Requests.
|
|
RADIUS_ACTION fAction = raContinue, *pfAction;
|
|
if (allowedActions &&
|
|
request.get_Request() == IAS_REQUEST_ACCESS_REQUEST)
|
|
{
|
|
pfAction = &fAction;
|
|
}
|
|
else
|
|
{
|
|
pfAction = NULL;
|
|
}
|
|
|
|
BOOL handled = FALSE;
|
|
|
|
// Invoke each extension.
|
|
for (DWORD i = 0; i < numExtensions && !handled; ++i)
|
|
{
|
|
IASTracePrintf("Invoking extension %S.", extensions[i].getName());
|
|
|
|
OutAttributes outAttrs(extensions[i]);
|
|
DWORD error = extensions[i].process(
|
|
pAttrs,
|
|
&outAttrs,
|
|
pfAction
|
|
);
|
|
|
|
// Abort on error ...
|
|
if (error != NO_ERROR)
|
|
{
|
|
IASTraceFailure("RadiusExtensionProcess", error);
|
|
|
|
_com_issue_error(IAS_INTERNAL_ERROR);
|
|
}
|
|
|
|
// Process the action.
|
|
if (fAction == raAccept && (allowedActions & ACTION_ACCEPT))
|
|
{
|
|
IASTraceString("Extension action: Accept");
|
|
|
|
authType.store(request);
|
|
|
|
request.SetResponse(IAS_RESPONSE_ACCESS_ACCEPT);
|
|
retval = IAS_REQUEST_STATUS_CONTINUE;
|
|
handled = TRUE;
|
|
}
|
|
else if (fAction == raReject && (allowedActions & ACTION_REJECT))
|
|
{
|
|
IASTraceString("Extension action: Reject");
|
|
|
|
// In the reject case, we have to remove any existing
|
|
// authentication type, because we may be an authorization
|
|
// extension.
|
|
DWORD attrId = IAS_ATTRIBUTE_AUTHENTICATION_TYPE;
|
|
request.RemoveAttributesByType(1, &attrId);
|
|
|
|
authType.store(request);
|
|
|
|
request.SetResponse(IAS_RESPONSE_ACCESS_REJECT, IAS_AUTH_FAILURE);
|
|
retval = IAS_REQUEST_STATUS_HANDLED;
|
|
handled = TRUE;
|
|
}
|
|
else
|
|
{
|
|
IASTraceString("Extension action: Continue");
|
|
}
|
|
|
|
// Store the outAttrs (if any).
|
|
if (outAttrs)
|
|
{
|
|
StoreBaseCampAttributes(request, outAttrs);
|
|
}
|
|
}
|
|
|
|
// Convert any VSAs back to internal format.
|
|
filter.radiusToIAS(request);
|
|
}
|
|
catch (const _com_error& ce)
|
|
{
|
|
IASTraceExcept();
|
|
|
|
pRequest->SetResponse(IAS_RESPONSE_DISCARD_PACKET, ce.Error());
|
|
retval = IAS_REQUEST_STATUS_ABORT;
|
|
}
|
|
|
|
// Clean up the attributes.
|
|
FreeBaseCampAttributes(pAttrs);
|
|
|
|
return retval;
|
|
}
|