mirror of
https://github.com/mozilla/gecko-dev.git
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690 lines
20 KiB
C++
690 lines
20 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsUnknownDecoder.h"
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#include "nsIServiceManager.h"
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#include "nsIStreamConverterService.h"
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#include "nsIPipe.h"
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#include "nsIInputStream.h"
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#include "nsIOutputStream.h"
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#include "nsMimeTypes.h"
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#include "netCore.h"
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#include "nsXPIDLString.h"
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#include "nsIPrefService.h"
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#include "nsIPrefBranch.h"
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#include "nsICategoryManager.h"
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#include "nsISupportsPrimitives.h"
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#include "nsIContentSniffer.h"
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#include "nsCRT.h"
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#include "nsIMIMEService.h"
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#include "nsIViewSourceChannel.h"
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#include "nsIHttpChannel.h"
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#include "nsNetCID.h"
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#define MAX_BUFFER_SIZE 512
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nsUnknownDecoder::nsUnknownDecoder()
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: mBuffer(nullptr)
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, mBufferLen(0)
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, mRequireHTMLsuffix(false)
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{
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nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
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if (prefs) {
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bool val;
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if (NS_SUCCEEDED(prefs->GetBoolPref("security.requireHTMLsuffix", &val)))
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mRequireHTMLsuffix = val;
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}
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}
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nsUnknownDecoder::~nsUnknownDecoder()
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{
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if (mBuffer) {
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delete [] mBuffer;
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mBuffer = nullptr;
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}
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}
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// ----
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//
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// nsISupports implementation...
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//
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// ----
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NS_IMPL_ADDREF(nsUnknownDecoder)
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NS_IMPL_RELEASE(nsUnknownDecoder)
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NS_INTERFACE_MAP_BEGIN(nsUnknownDecoder)
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NS_INTERFACE_MAP_ENTRY(nsIStreamConverter)
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NS_INTERFACE_MAP_ENTRY(nsIStreamListener)
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NS_INTERFACE_MAP_ENTRY(nsIRequestObserver)
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NS_INTERFACE_MAP_ENTRY(nsIContentSniffer)
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NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIStreamListener)
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NS_INTERFACE_MAP_END
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// ----
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//
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// nsIStreamConverter methods...
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//
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// ----
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NS_IMETHODIMP
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nsUnknownDecoder::Convert(nsIInputStream *aFromStream,
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const char *aFromType,
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const char *aToType,
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nsISupports *aCtxt,
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nsIInputStream **aResultStream)
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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nsUnknownDecoder::AsyncConvertData(const char *aFromType,
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const char *aToType,
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nsIStreamListener *aListener,
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nsISupports *aCtxt)
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{
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NS_ASSERTION(aListener && aFromType && aToType,
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"null pointer passed into multi mixed converter");
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// hook up our final listener. this guy gets the various On*() calls we want to throw
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// at him.
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//
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mNextListener = aListener;
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return (aListener) ? NS_OK : NS_ERROR_FAILURE;
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}
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// ----
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//
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// nsIStreamListener methods...
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//
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// ----
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NS_IMETHODIMP
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nsUnknownDecoder::OnDataAvailable(nsIRequest* request,
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nsISupports *aCtxt,
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nsIInputStream *aStream,
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uint64_t aSourceOffset,
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uint32_t aCount)
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{
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nsresult rv = NS_OK;
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if (!mNextListener) return NS_ERROR_FAILURE;
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if (mContentType.IsEmpty()) {
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uint32_t count, len;
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// If the buffer has not been allocated by now, just fail...
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if (!mBuffer) return NS_ERROR_OUT_OF_MEMORY;
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//
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// Determine how much of the stream should be read to fill up the
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// sniffer buffer...
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//
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if (mBufferLen + aCount >= MAX_BUFFER_SIZE) {
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count = MAX_BUFFER_SIZE-mBufferLen;
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} else {
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count = aCount;
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}
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// Read the data into the buffer...
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rv = aStream->Read((mBuffer+mBufferLen), count, &len);
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if (NS_FAILED(rv)) return rv;
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mBufferLen += len;
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aCount -= len;
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if (aCount) {
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//
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// Adjust the source offset... The call to FireListenerNotifications(...)
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// will make the first OnDataAvailable(...) call with an offset of 0.
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// So, this offset needs to be adjusted to reflect that...
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//
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aSourceOffset += mBufferLen;
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DetermineContentType(request);
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rv = FireListenerNotifications(request, aCtxt);
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}
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}
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// Must not fire ODA again if it failed once
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if (aCount && NS_SUCCEEDED(rv)) {
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NS_ASSERTION(!mContentType.IsEmpty(),
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"Content type should be known by now.");
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rv = mNextListener->OnDataAvailable(request, aCtxt, aStream,
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aSourceOffset, aCount);
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}
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return rv;
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}
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// ----
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//
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// nsIRequestObserver methods...
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//
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// ----
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NS_IMETHODIMP
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nsUnknownDecoder::OnStartRequest(nsIRequest* request, nsISupports *aCtxt)
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{
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nsresult rv = NS_OK;
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if (!mNextListener) return NS_ERROR_FAILURE;
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// Allocate the sniffer buffer...
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if (NS_SUCCEEDED(rv) && !mBuffer) {
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mBuffer = new char[MAX_BUFFER_SIZE];
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if (!mBuffer) {
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rv = NS_ERROR_OUT_OF_MEMORY;
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}
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}
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// Do not pass the OnStartRequest on to the next listener (yet)...
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return rv;
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}
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NS_IMETHODIMP
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nsUnknownDecoder::OnStopRequest(nsIRequest* request, nsISupports *aCtxt,
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nsresult aStatus)
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{
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nsresult rv = NS_OK;
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if (!mNextListener) return NS_ERROR_FAILURE;
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//
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// The total amount of data is less than the size of the sniffer buffer.
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// Analyze the buffer now...
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//
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if (mContentType.IsEmpty()) {
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DetermineContentType(request);
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rv = FireListenerNotifications(request, aCtxt);
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if (NS_FAILED(rv)) {
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aStatus = rv;
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}
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}
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rv = mNextListener->OnStopRequest(request, aCtxt, aStatus);
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mNextListener = 0;
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return rv;
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}
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// ----
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//
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// nsIContentSniffer methods...
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//
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// ----
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NS_IMETHODIMP
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nsUnknownDecoder::GetMIMETypeFromContent(nsIRequest* aRequest,
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const uint8_t* aData,
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uint32_t aLength,
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nsACString& type)
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{
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mBuffer = const_cast<char*>(reinterpret_cast<const char*>(aData));
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mBufferLen = aLength;
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DetermineContentType(aRequest);
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mBuffer = nullptr;
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mBufferLen = 0;
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type.Assign(mContentType);
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mContentType.Truncate();
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return type.IsEmpty() ? NS_ERROR_NOT_AVAILABLE : NS_OK;
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}
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// Actual sniffing code
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bool nsUnknownDecoder::AllowSniffing(nsIRequest* aRequest)
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{
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if (!mRequireHTMLsuffix) {
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return true;
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}
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nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
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if (!channel) {
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NS_ERROR("QI failed");
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return false;
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}
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nsCOMPtr<nsIURI> uri;
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if (NS_FAILED(channel->GetURI(getter_AddRefs(uri))) || !uri) {
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return false;
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}
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bool isLocalFile = false;
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if (NS_FAILED(uri->SchemeIs("file", &isLocalFile)) || isLocalFile) {
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return false;
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}
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return true;
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}
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/**
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* This is the array of sniffer entries that depend on "magic numbers"
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* in the file. Each entry has either a type associated with it (set
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* these with the SNIFFER_ENTRY macro) or a function to be executed
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* (set these with the SNIFFER_ENTRY_WITH_FUNC macro). The function
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* should take a single nsIRequest* and returns bool -- true if
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* it sets mContentType, false otherwise
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*/
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nsUnknownDecoder::nsSnifferEntry nsUnknownDecoder::sSnifferEntries[] = {
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SNIFFER_ENTRY("%PDF-", APPLICATION_PDF),
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SNIFFER_ENTRY("%!PS-Adobe-", APPLICATION_POSTSCRIPT),
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// Files that start with mailbox delimiters let's provisionally call
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// text/plain
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SNIFFER_ENTRY("From", TEXT_PLAIN),
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SNIFFER_ENTRY(">From", TEXT_PLAIN),
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// If the buffer begins with "#!" or "%!" then it is a script of
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// some sort... "Scripts" can include arbitrary data to be passed
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// to an interpreter, so we need to decide whether we can call this
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// text or whether it's data.
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SNIFFER_ENTRY_WITH_FUNC("#!", &nsUnknownDecoder::LastDitchSniff),
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// XXXbz should (and can) we also include the various ways that <?xml can
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// appear as UTF-16 and such? See http://www.w3.org/TR/REC-xml#sec-guessing
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SNIFFER_ENTRY_WITH_FUNC("<?xml", &nsUnknownDecoder::SniffForXML)
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};
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uint32_t nsUnknownDecoder::sSnifferEntryNum =
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sizeof(nsUnknownDecoder::sSnifferEntries) /
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sizeof(nsUnknownDecoder::nsSnifferEntry);
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void nsUnknownDecoder::DetermineContentType(nsIRequest* aRequest)
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{
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NS_ASSERTION(mContentType.IsEmpty(), "Content type is already known.");
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if (!mContentType.IsEmpty()) return;
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// First, run through all the types we can detect reliably based on
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// magic numbers
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uint32_t i;
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for (i = 0; i < sSnifferEntryNum; ++i) {
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if (mBufferLen >= sSnifferEntries[i].mByteLen && // enough data
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memcmp(mBuffer, sSnifferEntries[i].mBytes, sSnifferEntries[i].mByteLen) == 0) { // and type matches
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NS_ASSERTION(sSnifferEntries[i].mMimeType ||
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sSnifferEntries[i].mContentTypeSniffer,
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"Must have either a type string or a function to set the type");
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NS_ASSERTION(!sSnifferEntries[i].mMimeType ||
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!sSnifferEntries[i].mContentTypeSniffer,
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"Both a type string and a type sniffing function set;"
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" using type string");
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if (sSnifferEntries[i].mMimeType) {
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mContentType = sSnifferEntries[i].mMimeType;
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NS_ASSERTION(!mContentType.IsEmpty(),
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"Content type should be known by now.");
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return;
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}
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if ((this->*(sSnifferEntries[i].mContentTypeSniffer))(aRequest)) {
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NS_ASSERTION(!mContentType.IsEmpty(),
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"Content type should be known by now.");
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return;
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}
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}
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}
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if (TryContentSniffers(aRequest)) {
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NS_ASSERTION(!mContentType.IsEmpty(),
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"Content type should be known by now.");
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return;
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}
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if (SniffForHTML(aRequest)) {
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NS_ASSERTION(!mContentType.IsEmpty(),
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"Content type should be known by now.");
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return;
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}
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// We don't know what this is yet. Before we just give up, try
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// the URI from the request.
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if (SniffURI(aRequest)) {
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NS_ASSERTION(!mContentType.IsEmpty(),
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"Content type should be known by now.");
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return;
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}
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LastDitchSniff(aRequest);
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NS_ASSERTION(!mContentType.IsEmpty(),
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"Content type should be known by now.");
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}
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bool nsUnknownDecoder::TryContentSniffers(nsIRequest* aRequest)
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{
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// Enumerate content sniffers
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nsCOMPtr<nsICategoryManager> catMan(do_GetService("@mozilla.org/categorymanager;1"));
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if (!catMan) {
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return false;
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}
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nsCOMPtr<nsISimpleEnumerator> sniffers;
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catMan->EnumerateCategory("content-sniffing-services", getter_AddRefs(sniffers));
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if (!sniffers) {
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return false;
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}
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bool hasMore;
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while (NS_SUCCEEDED(sniffers->HasMoreElements(&hasMore)) && hasMore) {
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nsCOMPtr<nsISupports> elem;
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sniffers->GetNext(getter_AddRefs(elem));
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NS_ASSERTION(elem, "No element even though hasMore returned true!?");
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nsCOMPtr<nsISupportsCString> sniffer_id(do_QueryInterface(elem));
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NS_ASSERTION(sniffer_id, "element is no nsISupportsCString!?");
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nsAutoCString contractid;
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nsresult rv = sniffer_id->GetData(contractid);
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if (NS_FAILED(rv)) {
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continue;
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}
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nsCOMPtr<nsIContentSniffer> sniffer(do_GetService(contractid.get()));
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if (!sniffer) {
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continue;
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}
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rv = sniffer->GetMIMETypeFromContent(aRequest, (const uint8_t*)mBuffer,
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mBufferLen, mContentType);
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if (NS_SUCCEEDED(rv)) {
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return true;
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}
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}
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return false;
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}
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bool nsUnknownDecoder::SniffForHTML(nsIRequest* aRequest)
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{
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/*
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* To prevent a possible attack, we will not consider this to be
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* html content if it comes from the local file system and our prefs
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* are set right
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*/
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if (!AllowSniffing(aRequest)) {
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return false;
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}
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// Now look for HTML.
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const char* str = mBuffer;
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const char* end = mBuffer + mBufferLen;
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// skip leading whitespace
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while (str != end && nsCRT::IsAsciiSpace(*str)) {
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++str;
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}
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// did we find something like a start tag?
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if (str == end || *str != '<' || ++str == end) {
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return false;
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}
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// If we seem to be SGML or XML and we got down here, just pretend we're HTML
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if (*str == '!' || *str == '?') {
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mContentType = TEXT_HTML;
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return true;
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}
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uint32_t bufSize = end - str;
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// We use sizeof(_tagstr) below because that's the length of _tagstr
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// with the one char " " or ">" appended.
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#define MATCHES_TAG(_tagstr) \
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(bufSize >= sizeof(_tagstr) && \
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(PL_strncasecmp(str, _tagstr " ", sizeof(_tagstr)) == 0 || \
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PL_strncasecmp(str, _tagstr ">", sizeof(_tagstr)) == 0))
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if (MATCHES_TAG("html") ||
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MATCHES_TAG("frameset") ||
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MATCHES_TAG("body") ||
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MATCHES_TAG("head") ||
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MATCHES_TAG("script") ||
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MATCHES_TAG("iframe") ||
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MATCHES_TAG("a") ||
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MATCHES_TAG("img") ||
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MATCHES_TAG("table") ||
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MATCHES_TAG("title") ||
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MATCHES_TAG("link") ||
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MATCHES_TAG("base") ||
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MATCHES_TAG("style") ||
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MATCHES_TAG("div") ||
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MATCHES_TAG("p") ||
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MATCHES_TAG("font") ||
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MATCHES_TAG("applet") ||
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MATCHES_TAG("meta") ||
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MATCHES_TAG("center") ||
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MATCHES_TAG("form") ||
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MATCHES_TAG("isindex") ||
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MATCHES_TAG("h1") ||
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MATCHES_TAG("h2") ||
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MATCHES_TAG("h3") ||
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MATCHES_TAG("h4") ||
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MATCHES_TAG("h5") ||
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MATCHES_TAG("h6") ||
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MATCHES_TAG("b") ||
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MATCHES_TAG("pre")) {
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mContentType = TEXT_HTML;
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return true;
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}
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#undef MATCHES_TAG
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return false;
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}
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bool nsUnknownDecoder::SniffForXML(nsIRequest* aRequest)
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{
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// Just like HTML, this should be able to be shut off.
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if (!AllowSniffing(aRequest)) {
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return false;
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}
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// First see whether we can glean anything from the uri...
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if (!SniffURI(aRequest)) {
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// Oh well; just generic XML will have to do
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mContentType = TEXT_XML;
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}
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return true;
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}
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bool nsUnknownDecoder::SniffURI(nsIRequest* aRequest)
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{
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nsCOMPtr<nsIMIMEService> mimeService(do_GetService("@mozilla.org/mime;1"));
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if (mimeService) {
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nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
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if (channel) {
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nsCOMPtr<nsIURI> uri;
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nsresult result = channel->GetURI(getter_AddRefs(uri));
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if (NS_SUCCEEDED(result) && uri) {
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nsAutoCString type;
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result = mimeService->GetTypeFromURI(uri, type);
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if (NS_SUCCEEDED(result)) {
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mContentType = type;
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return true;
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}
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}
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}
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}
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return false;
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}
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// This macro is based on RFC 2046 Section 4.1.2. Treat any char 0-31
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// except the 9-13 range (\t, \n, \v, \f, \r) and char 27 (used by
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// encodings like Shift_JIS) as non-text
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#define IS_TEXT_CHAR(ch) \
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(((unsigned char)(ch)) > 31 || (9 <= (ch) && (ch) <= 13) || (ch) == 27)
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bool nsUnknownDecoder::LastDitchSniff(nsIRequest* aRequest)
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{
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// All we can do now is try to guess whether this is text/plain or
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// application/octet-stream
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// First, check for a BOM. If we see one, assume this is text/plain
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// in whatever encoding. If there is a BOM _and_ text we will
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// always have at least 4 bytes in the buffer (since the 2-byte BOMs
|
|
// are for 2-byte encodings and the UTF-8 BOM is 3 bytes).
|
|
if (mBufferLen >= 4) {
|
|
const unsigned char* buf = (const unsigned char*)mBuffer;
|
|
if ((buf[0] == 0xFE && buf[1] == 0xFF) || // UTF-16, Big Endian
|
|
(buf[0] == 0xFF && buf[1] == 0xFE) || // UTF-16 or UCS-4, Little Endian
|
|
(buf[0] == 0xEF && buf[1] == 0xBB && buf[2] == 0xBF) || // UTF-8
|
|
(buf[0] == 0 && buf[1] == 0 && buf[2] == 0xFE && buf[3] == 0xFF)) { // UCS-4, Big Endian
|
|
|
|
mContentType = TEXT_PLAIN;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// Now see whether the buffer has any non-text chars. If not, then let's
|
|
// just call it text/plain...
|
|
//
|
|
uint32_t i;
|
|
for (i = 0; i < mBufferLen && IS_TEXT_CHAR(mBuffer[i]); i++) {
|
|
continue;
|
|
}
|
|
|
|
if (i == mBufferLen) {
|
|
mContentType = TEXT_PLAIN;
|
|
}
|
|
else {
|
|
mContentType = APPLICATION_OCTET_STREAM;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
nsresult nsUnknownDecoder::FireListenerNotifications(nsIRequest* request,
|
|
nsISupports *aCtxt)
|
|
{
|
|
nsresult rv = NS_OK;
|
|
|
|
if (!mNextListener) return NS_ERROR_FAILURE;
|
|
|
|
if (!mContentType.IsEmpty()) {
|
|
nsCOMPtr<nsIViewSourceChannel> viewSourceChannel =
|
|
do_QueryInterface(request);
|
|
if (viewSourceChannel) {
|
|
rv = viewSourceChannel->SetOriginalContentType(mContentType);
|
|
} else {
|
|
nsCOMPtr<nsIChannel> channel = do_QueryInterface(request, &rv);
|
|
if (NS_SUCCEEDED(rv)) {
|
|
// Set the new content type on the channel...
|
|
rv = channel->SetContentType(mContentType);
|
|
}
|
|
}
|
|
|
|
NS_ASSERTION(NS_SUCCEEDED(rv), "Unable to set content type on channel!");
|
|
|
|
if (NS_FAILED(rv)) {
|
|
// Cancel the request to make sure it has the correct status if
|
|
// mNextListener looks at it.
|
|
request->Cancel(rv);
|
|
mNextListener->OnStartRequest(request, aCtxt);
|
|
return rv;
|
|
}
|
|
}
|
|
|
|
// Fire the OnStartRequest(...)
|
|
rv = mNextListener->OnStartRequest(request, aCtxt);
|
|
|
|
if (!mBuffer) return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
// If the request was canceled, then we need to treat that equivalently
|
|
// to an error returned by OnStartRequest.
|
|
if (NS_SUCCEEDED(rv))
|
|
request->GetStatus(&rv);
|
|
|
|
// Fire the first OnDataAvailable for the data that was read from the
|
|
// stream into the sniffer buffer...
|
|
if (NS_SUCCEEDED(rv) && (mBufferLen > 0)) {
|
|
uint32_t len = 0;
|
|
nsCOMPtr<nsIInputStream> in;
|
|
nsCOMPtr<nsIOutputStream> out;
|
|
|
|
// Create a pipe and fill it with the data from the sniffer buffer.
|
|
rv = NS_NewPipe(getter_AddRefs(in), getter_AddRefs(out),
|
|
MAX_BUFFER_SIZE, MAX_BUFFER_SIZE);
|
|
|
|
if (NS_SUCCEEDED(rv)) {
|
|
rv = out->Write(mBuffer, mBufferLen, &len);
|
|
if (NS_SUCCEEDED(rv)) {
|
|
if (len == mBufferLen) {
|
|
rv = mNextListener->OnDataAvailable(request, aCtxt, in, 0, len);
|
|
} else {
|
|
NS_ERROR("Unable to write all the data into the pipe.");
|
|
rv = NS_ERROR_FAILURE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
delete [] mBuffer;
|
|
mBuffer = nullptr;
|
|
mBufferLen = 0;
|
|
|
|
return rv;
|
|
}
|
|
|
|
void
|
|
nsBinaryDetector::DetermineContentType(nsIRequest* aRequest)
|
|
{
|
|
nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aRequest);
|
|
if (!httpChannel) {
|
|
return;
|
|
}
|
|
|
|
// It's an HTTP channel. Check for the text/plain mess
|
|
nsAutoCString contentTypeHdr;
|
|
httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("Content-Type"),
|
|
contentTypeHdr);
|
|
nsAutoCString contentType;
|
|
httpChannel->GetContentType(contentType);
|
|
|
|
// Make sure to do a case-sensitive exact match comparison here. Apache
|
|
// 1.x just sends text/plain for "unknown", while Apache 2.x sends
|
|
// text/plain with a ISO-8859-1 charset. Debian's Apache version, just to
|
|
// be different, sends text/plain with iso-8859-1 charset. For extra fun,
|
|
// FC7, RHEL4, and Ubuntu Feisty send charset=UTF-8. Don't do general
|
|
// case-insensitive comparison, since we really want to apply this crap as
|
|
// rarely as we can.
|
|
if (!contentType.EqualsLiteral("text/plain") ||
|
|
(!contentTypeHdr.EqualsLiteral("text/plain") &&
|
|
!contentTypeHdr.EqualsLiteral("text/plain; charset=ISO-8859-1") &&
|
|
!contentTypeHdr.EqualsLiteral("text/plain; charset=iso-8859-1") &&
|
|
!contentTypeHdr.EqualsLiteral("text/plain; charset=UTF-8"))) {
|
|
return;
|
|
}
|
|
|
|
// Check whether we have content-encoding. If we do, don't try to
|
|
// detect the type.
|
|
// XXXbz we could improve this by doing a local decompress if we
|
|
// wanted, I'm sure.
|
|
nsAutoCString contentEncoding;
|
|
httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("Content-Encoding"),
|
|
contentEncoding);
|
|
if (!contentEncoding.IsEmpty()) {
|
|
return;
|
|
}
|
|
|
|
LastDitchSniff(aRequest);
|
|
if (mContentType.Equals(APPLICATION_OCTET_STREAM)) {
|
|
// We want to guess at it instead
|
|
mContentType = APPLICATION_GUESS_FROM_EXT;
|
|
} else {
|
|
// Let the text/plain type we already have be, so that other content
|
|
// sniffers can also get a shot at this data.
|
|
mContentType.Truncate();
|
|
}
|
|
}
|