DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (1aeaa33a64f9)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "ThirdPartyUtil.h"
#include "nsNetCID.h"
#include "nsNetUtil.h"
#include "nsIChannel.h"
#include "nsIServiceManager.h"
#include "nsIHttpChannelInternal.h"
#include "nsIDOMWindow.h"
#include "nsILoadContext.h"
#include "nsIPrincipal.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsIURI.h"
#include "nsThreadUtils.h"
#include "mozilla/Logging.h"
#include "nsPIDOMWindow.h"

NS_IMPL_ISUPPORTS(ThirdPartyUtil, mozIThirdPartyUtil)

//
// MOZ_LOG=thirdPartyUtil:5
//
static mozilla::LazyLogModule gThirdPartyLog("thirdPartyUtil");
#undef LOG
#define LOG(args) MOZ_LOG(gThirdPartyLog, mozilla::LogLevel::Debug, args)

nsresult ThirdPartyUtil::Init() {
  NS_ENSURE_TRUE(NS_IsMainThread(), NS_ERROR_NOT_AVAILABLE);

  nsresult rv;
  mTLDService = do_GetService(NS_EFFECTIVETLDSERVICE_CONTRACTID, &rv);

  return rv;
}

// Determine if aFirstDomain is a different base domain to aSecondURI; or, if
// the concept of base domain does not apply, determine if the two hosts are not
// string-identical.
nsresult ThirdPartyUtil::IsThirdPartyInternal(const nsCString& aFirstDomain,
                                              nsIURI* aSecondURI,
                                              bool* aResult) {
  if (!aSecondURI) {
    return NS_ERROR_INVALID_ARG;
  }

  // Get the base domain for aSecondURI.
  nsCString secondDomain;
  nsresult rv = GetBaseDomain(aSecondURI, secondDomain);
  LOG(("ThirdPartyUtil::IsThirdPartyInternal %s =? %s", aFirstDomain.get(),
       secondDomain.get()));
  if (NS_FAILED(rv)) return rv;

  // Check strict equality.
  *aResult = aFirstDomain != secondDomain;
  return NS_OK;
}

// Get the URI associated with a window.
NS_IMETHODIMP
ThirdPartyUtil::GetURIFromWindow(mozIDOMWindowProxy* aWin, nsIURI** result) {
  nsresult rv;
  nsCOMPtr<nsIScriptObjectPrincipal> scriptObjPrin = do_QueryInterface(aWin);
  if (!scriptObjPrin) {
    return NS_ERROR_INVALID_ARG;
  }

  nsIPrincipal* prin = scriptObjPrin->GetPrincipal();
  if (!prin) {
    return NS_ERROR_INVALID_ARG;
  }

  if (prin->GetIsNullPrincipal()) {
    LOG(("ThirdPartyUtil::GetURIFromWindow can't use null principal\n"));
    return NS_ERROR_INVALID_ARG;
  }

  rv = prin->GetURI(result);
  return rv;
}

// Determine if aFirstURI is third party with respect to aSecondURI. See docs
// for mozIThirdPartyUtil.
NS_IMETHODIMP
ThirdPartyUtil::IsThirdPartyURI(nsIURI* aFirstURI, nsIURI* aSecondURI,
                                bool* aResult) {
  NS_ENSURE_ARG(aFirstURI);
  NS_ENSURE_ARG(aSecondURI);
  NS_ASSERTION(aResult, "null outparam pointer");

  nsCString firstHost;
  nsresult rv = GetBaseDomain(aFirstURI, firstHost);
  if (NS_FAILED(rv)) return rv;

  return IsThirdPartyInternal(firstHost, aSecondURI, aResult);
}

// Determine if any URI of the window hierarchy of aWindow is foreign with
// respect to aSecondURI. See docs for mozIThirdPartyUtil.
NS_IMETHODIMP
ThirdPartyUtil::IsThirdPartyWindow(mozIDOMWindowProxy* aWindow, nsIURI* aURI,
                                   bool* aResult) {
  NS_ENSURE_ARG(aWindow);
  NS_ASSERTION(aResult, "null outparam pointer");

  bool result;

  // Get the URI of the window, and its base domain.
  nsresult rv;
  nsCOMPtr<nsIURI> currentURI;
  rv = GetURIFromWindow(aWindow, getter_AddRefs(currentURI));
  if (NS_FAILED(rv)) return rv;

  nsCString bottomDomain;
  rv = GetBaseDomain(currentURI, bottomDomain);
  if (NS_FAILED(rv)) return rv;

  if (aURI) {
    // Determine whether aURI is foreign with respect to currentURI.
    rv = IsThirdPartyInternal(bottomDomain, aURI, &result);
    if (NS_FAILED(rv)) return rv;

    if (result) {
      *aResult = true;
      return NS_OK;
    }
  }

  nsCOMPtr<nsPIDOMWindowOuter> current = nsPIDOMWindowOuter::From(aWindow),
                               parent;
  nsCOMPtr<nsIURI> parentURI;
  do {
    // We use GetScriptableParent rather than GetParent because we consider
    // <iframe mozbrowser> to be a top-level frame.
    parent = current->GetScriptableParent();
    if (SameCOMIdentity(parent, current)) {
      // We're at the topmost content window. We already know the answer.
      *aResult = false;
      return NS_OK;
    }

    rv = GetURIFromWindow(parent, getter_AddRefs(parentURI));
    NS_ENSURE_SUCCESS(rv, rv);

    rv = IsThirdPartyInternal(bottomDomain, parentURI, &result);
    if (NS_FAILED(rv)) return rv;

    if (result) {
      *aResult = true;
      return NS_OK;
    }

    current = parent;
    currentURI = parentURI;
  } while (1);

  NS_NOTREACHED("should've returned");
  return NS_ERROR_UNEXPECTED;
}

// Determine if the URI associated with aChannel or any URI of the window
// hierarchy associated with the channel is foreign with respect to aSecondURI.
// See docs for mozIThirdPartyUtil.
NS_IMETHODIMP
ThirdPartyUtil::IsThirdPartyChannel(nsIChannel* aChannel, nsIURI* aURI,
                                    bool* aResult) {
  LOG(("ThirdPartyUtil::IsThirdPartyChannel [channel=%p]", aChannel));
  NS_ENSURE_ARG(aChannel);
  NS_ASSERTION(aResult, "null outparam pointer");

  nsresult rv;
  bool doForce = false;
  nsCOMPtr<nsIHttpChannelInternal> httpChannelInternal =
      do_QueryInterface(aChannel);
  if (httpChannelInternal) {
    uint32_t flags;
    rv = httpChannelInternal->GetThirdPartyFlags(&flags);
    NS_ENSURE_SUCCESS(rv, rv);

    doForce = (flags & nsIHttpChannelInternal::THIRD_PARTY_FORCE_ALLOW);

    // If aURI was not supplied, and we're forcing, then we're by definition
    // not foreign. If aURI was supplied, we still want to check whether it's
    // foreign with respect to the channel URI. (The forcing only applies to
    // whatever window hierarchy exists above the channel.)
    if (doForce && !aURI) {
      *aResult = false;
      return NS_OK;
    }
  }

  bool parentIsThird = false;

  // Obtain the URI from the channel, and its base domain.
  nsCOMPtr<nsIURI> channelURI;
  rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(channelURI));
  if (NS_FAILED(rv)) return rv;

  nsCString channelDomain;
  rv = GetBaseDomain(channelURI, channelDomain);
  if (NS_FAILED(rv)) return rv;

  if (!doForce) {
    if (nsCOMPtr<nsILoadInfo> loadInfo = aChannel->GetLoadInfo()) {
      parentIsThird = loadInfo->GetIsInThirdPartyContext();
      if (!parentIsThird && loadInfo->GetExternalContentPolicyType() !=
                                nsIContentPolicy::TYPE_DOCUMENT) {
        // Check if the channel itself is third-party to its own requestor.
        // Unforunately, we have to go through the loading principal.
        nsCOMPtr<nsIURI> parentURI;
        loadInfo->LoadingPrincipal()->GetURI(getter_AddRefs(parentURI));
        rv = IsThirdPartyInternal(channelDomain, parentURI, &parentIsThird);
        if (NS_FAILED(rv)) return rv;
      }
    } else {
      NS_WARNING(
          "Found channel with no loadinfo, assuming third-party request");
      parentIsThird = true;
    }
  }

  // If we're not comparing to a URI, we have our answer. Otherwise, if
  // parentIsThird, we're not forcing and we know that we're a third-party
  // request.
  if (!aURI || parentIsThird) {
    *aResult = parentIsThird;
    return NS_OK;
  }

  // Determine whether aURI is foreign with respect to channelURI.
  return IsThirdPartyInternal(channelDomain, aURI, aResult);
}

NS_IMETHODIMP
ThirdPartyUtil::GetTopWindowForChannel(nsIChannel* aChannel,
                                       mozIDOMWindowProxy** aWin) {
  NS_ENSURE_ARG(aWin);

  // Find the associated window and its parent window.
  nsCOMPtr<nsILoadContext> ctx;
  NS_QueryNotificationCallbacks(aChannel, ctx);
  if (!ctx) {
    return NS_ERROR_INVALID_ARG;
  }

  nsCOMPtr<mozIDOMWindowProxy> window;
  ctx->GetAssociatedWindow(getter_AddRefs(window));
  if (!window) {
    return NS_ERROR_INVALID_ARG;
  }

  nsCOMPtr<nsPIDOMWindowOuter> top = nsPIDOMWindowOuter::From(window)->GetTop();
  top.forget(aWin);
  return NS_OK;
}

// Get the base domain for aHostURI; e.g. for "www.bbc.co.uk", this would be
// "bbc.co.uk". Only properly-formed URI's are tolerated, though a trailing
// dot may be present. If aHostURI is an IP address, an alias such as
// 'localhost', an eTLD such as 'co.uk', or the empty string, aBaseDomain will
// be the exact host. The result of this function should only be used in exact
// string comparisons, since substring comparisons will not be valid for the
// special cases elided above.
NS_IMETHODIMP
ThirdPartyUtil::GetBaseDomain(nsIURI* aHostURI, nsACString& aBaseDomain) {
  if (!aHostURI) {
    return NS_ERROR_INVALID_ARG;
  }

  // Get the base domain. this will fail if the host contains a leading dot,
  // more than one trailing dot, or is otherwise malformed.
  nsresult rv = mTLDService->GetBaseDomain(aHostURI, 0, aBaseDomain);
  if (rv == NS_ERROR_HOST_IS_IP_ADDRESS ||
      rv == NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS) {
    // aHostURI is either an IP address, an alias such as 'localhost', an eTLD
    // such as 'co.uk', or the empty string. Uses the normalized host in such
    // cases.
    rv = aHostURI->GetAsciiHost(aBaseDomain);
  }
  NS_ENSURE_SUCCESS(rv, rv);

  // aHostURI (and thus aBaseDomain) may be the string '.'. If so, fail.
  if (aBaseDomain.Length() == 1 && aBaseDomain.Last() == '.')
    return NS_ERROR_INVALID_ARG;

  // Reject any URIs without a host that aren't file:// URIs. This makes it the
  // only way we can get a base domain consisting of the empty string, which
  // means we can safely perform foreign tests on such URIs where "not foreign"
  // means "the involved URIs are all file://".
  if (aBaseDomain.IsEmpty()) {
    bool isFileURI = false;
    aHostURI->SchemeIs("file", &isFileURI);
    if (!isFileURI) {
      return NS_ERROR_INVALID_ARG;
    }
  }

  return NS_OK;
}