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 (c68fe15a81fc)

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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394
/* -*- Mode: C++; tab-width: 2; 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 "mozilla/PermissionDelegateHandler.h"

#include "nsGlobalWindowInner.h"
#include "nsPIDOMWindow.h"
#include "nsIPrincipal.h"
#include "nsContentPermissionHelper.h"

#include "mozilla/BasePrincipal.h"
#include "mozilla/StaticPrefs_permissions.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/FeaturePolicyUtils.h"
#include "mozilla/dom/WindowContext.h"
#include "mozilla/PermissionManager.h"

using namespace mozilla::dom;

namespace mozilla {

typedef PermissionDelegateHandler::PermissionDelegatePolicy DelegatePolicy;
typedef PermissionDelegateHandler::PermissionDelegateInfo DelegateInfo;

// Particular type of permissions to care about. We decide cases by case and
// give various types of controls over each of these.
static const DelegateInfo sPermissionsMap[] = {
    // Permissions API map
    {"geo", u"geolocation", DelegatePolicy::eDelegateUseFeaturePolicy},
    // The same with geo, but we support both to save some conversions between
    // "geo" and "geolocation"
    {"geolocation", u"geolocation", DelegatePolicy::eDelegateUseFeaturePolicy},
    {"desktop-notification", nullptr,
     DelegatePolicy::ePersistDeniedCrossOrigin},
    {"persistent-storage", nullptr, DelegatePolicy::ePersistDeniedCrossOrigin},
    {"vibration", nullptr, DelegatePolicy::ePersistDeniedCrossOrigin},
    {"midi", nullptr, DelegatePolicy::eDelegateUseIframeOrigin},
    {"storage-access", nullptr, DelegatePolicy::eDelegateUseIframeOrigin},
    {"camera", u"camera", DelegatePolicy::eDelegateUseFeaturePolicy},
    {"microphone", u"microphone", DelegatePolicy::eDelegateUseFeaturePolicy},
    {"screen", u"display-capture", DelegatePolicy::eDelegateUseFeaturePolicy},
    {"xr", u"xr-spatial-tracking", DelegatePolicy::eDelegateUseFeaturePolicy},
};

static_assert(PermissionDelegateHandler::DELEGATED_PERMISSION_COUNT ==
                  (sizeof(sPermissionsMap) / sizeof(DelegateInfo)),
              "The PermissionDelegateHandler::DELEGATED_PERMISSION_COUNT must "
              "match to the "
              "length of sPermissionsMap. Please update it.");

NS_IMPL_CYCLE_COLLECTION(PermissionDelegateHandler)
NS_IMPL_CYCLE_COLLECTING_ADDREF(PermissionDelegateHandler)
NS_IMPL_CYCLE_COLLECTING_RELEASE(PermissionDelegateHandler)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PermissionDelegateHandler)
  NS_INTERFACE_MAP_ENTRY(nsIPermissionDelegateHandler)
  NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END

PermissionDelegateHandler::PermissionDelegateHandler(dom::Document* aDocument)
    : mDocument(aDocument) {
  MOZ_ASSERT(aDocument);
}

/* static */
const DelegateInfo* PermissionDelegateHandler::GetPermissionDelegateInfo(
    const nsAString& aPermissionName) {
  nsAutoString lowerContent(aPermissionName);
  ToLowerCase(lowerContent);

  for (const auto& perm : sPermissionsMap) {
    if (lowerContent.EqualsASCII(perm.mPermissionName)) {
      return &perm;
    }
  }

  return nullptr;
}

NS_IMETHODIMP
PermissionDelegateHandler::MaybeUnsafePermissionDelegate(
    const nsTArray<nsCString>& aTypes, bool* aMaybeUnsafe) {
  *aMaybeUnsafe = false;
  if (!StaticPrefs::permissions_delegation_enabled()) {
    return NS_OK;
  }

  for (auto& type : aTypes) {
    const DelegateInfo* info =
        GetPermissionDelegateInfo(NS_ConvertUTF8toUTF16(type));
    if (!info) {
      continue;
    }

    nsAutoString featureName(info->mFeatureName);
    if (FeaturePolicyUtils::IsFeatureUnsafeAllowedAll(mDocument, featureName)) {
      *aMaybeUnsafe = true;
      return NS_OK;
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
PermissionDelegateHandler::GetPermissionDelegateFPEnabled(bool* aEnabled) {
  MOZ_ASSERT(NS_IsMainThread());
  *aEnabled = StaticPrefs::permissions_delegation_enabled() &&
              StaticPrefs::dom_security_featurePolicy_enabled();
  return NS_OK;
}

/* static */
nsresult PermissionDelegateHandler::GetDelegatePrincipal(
    const nsACString& aType, nsIContentPermissionRequest* aRequest,
    nsIPrincipal** aResult) {
  MOZ_ASSERT(aRequest);

  if (!StaticPrefs::permissions_delegation_enabled()) {
    return aRequest->GetPrincipal(aResult);
  }

  const DelegateInfo* info =
      GetPermissionDelegateInfo(NS_ConvertUTF8toUTF16(aType));
  if (!info) {
    *aResult = nullptr;
    return NS_OK;
  }

  if (info->mPolicy == DelegatePolicy::eDelegateUseTopOrigin ||
      (info->mPolicy == DelegatePolicy::eDelegateUseFeaturePolicy &&
       StaticPrefs::dom_security_featurePolicy_enabled())) {
    return aRequest->GetTopLevelPrincipal(aResult);
  }

  return aRequest->GetPrincipal(aResult);
}

bool PermissionDelegateHandler::Initialize() {
  MOZ_ASSERT(mDocument);

  mPermissionManager = PermissionManager::GetInstance();
  if (!mPermissionManager) {
    return false;
  }

  mPrincipal = mDocument->NodePrincipal();
  return true;
}

static bool IsCrossOriginContentToTop(Document* aDocument) {
  MOZ_ASSERT(aDocument);

  BrowsingContext* topBrowsingContext = aDocument->GetBrowsingContext()->Top();

  // In Fission, we can know if it is cross-origin by checking whether both
  // contexts in the same process. So, If they are not in the same process, we
  // can say that it's cross-origin.
  if (!topBrowsingContext->IsInProcess()) {
    return true;
  }

  RefPtr<Document> topDoc = topBrowsingContext->GetDocument();
  if (!topDoc) {
    return true;
  }

  nsCOMPtr<nsIPrincipal> topLevelPrincipal = topDoc->NodePrincipal();

  return !aDocument->NodePrincipal()->Subsumes(topLevelPrincipal);
}

bool PermissionDelegateHandler::HasFeaturePolicyAllowed(
    const DelegateInfo* info) const {
  if (info->mPolicy != DelegatePolicy::eDelegateUseFeaturePolicy ||
      !info->mFeatureName) {
    return true;
  }

  nsAutoString featureName(info->mFeatureName);
  return FeaturePolicyUtils::IsFeatureAllowed(mDocument, featureName);
}

bool PermissionDelegateHandler::HasPermissionDelegated(
    const nsACString& aType) {
  MOZ_ASSERT(mDocument);

  // System principal should have right to make permission request
  if (mPrincipal->IsSystemPrincipal()) {
    return true;
  }

  const DelegateInfo* info =
      GetPermissionDelegateInfo(NS_ConvertUTF8toUTF16(aType));
  if (!info || !HasFeaturePolicyAllowed(info)) {
    return false;
  }

  if (!StaticPrefs::permissions_delegation_enabled()) {
    return true;
  }

  if (info->mPolicy == DelegatePolicy::ePersistDeniedCrossOrigin &&
      !mDocument->IsTopLevelContentDocument() &&
      IsCrossOriginContentToTop(mDocument)) {
    return false;
  }

  return true;
}

nsresult PermissionDelegateHandler::GetPermission(const nsACString& aType,
                                                  uint32_t* aPermission,
                                                  bool aExactHostMatch) {
  MOZ_ASSERT(mDocument);
  MOZ_ASSERT(mPrincipal);

  if (mPrincipal->IsSystemPrincipal()) {
    *aPermission = nsIPermissionManager::ALLOW_ACTION;
    return NS_OK;
  }

  const DelegateInfo* info =
      GetPermissionDelegateInfo(NS_ConvertUTF8toUTF16(aType));
  if (!info || !HasFeaturePolicyAllowed(info)) {
    *aPermission = nsIPermissionManager::DENY_ACTION;
    return NS_OK;
  }

  nsresult (NS_STDCALL nsIPermissionManager::*testPermission)(
      nsIPrincipal*, const nsACString&, uint32_t*) =
      aExactHostMatch ? &nsIPermissionManager::TestExactPermissionFromPrincipal
                      : &nsIPermissionManager::TestPermissionFromPrincipal;

  if (!StaticPrefs::permissions_delegation_enabled()) {
    return (mPermissionManager->*testPermission)(mPrincipal, aType,
                                                 aPermission);
  }

  if (info->mPolicy == DelegatePolicy::ePersistDeniedCrossOrigin &&
      !mDocument->IsTopLevelContentDocument() &&
      IsCrossOriginContentToTop(mDocument)) {
    *aPermission = nsIPermissionManager::DENY_ACTION;
    return NS_OK;
  }

  nsIPrincipal* principal = mPrincipal;
  if ((info->mPolicy == DelegatePolicy::eDelegateUseTopOrigin ||
       (info->mPolicy == DelegatePolicy::eDelegateUseFeaturePolicy &&
        StaticPrefs::dom_security_featurePolicy_enabled()))) {
    RefPtr<WindowContext> topWC =
        mDocument->GetWindowContext()->TopWindowContext();

    if (topWC->IsInProcess()) {
      // If the top-level window context is in the same process, we directly get
      // the node principal from the top-level document to test the permission.
      // We cannot check the lists in the window context in this case since the
      // 'perm-changed' could be notified in the iframe before the top-level in
      // certain cases, for example, request permissions in first-party iframes.
      // In this case, the list in window context hasn't gotten updated, so it
      // would has an out-dated value until the top-level window get the
      // observer. So, we have to test permission manager directly if we can.
      RefPtr<Document> topDoc = topWC->GetBrowsingContext()->GetDocument();

      if (topDoc) {
        principal = topDoc->NodePrincipal();
      }
    } else {
      // Get the delegated permissions from the top-level window context.
      DelegatedPermissionList list =
          aExactHostMatch ? topWC->GetDelegatedExactHostMatchPermissions()
                          : topWC->GetDelegatedPermissions();
      size_t idx = std::distance(sPermissionsMap, info);
      *aPermission = list.mPermissions[idx];
      return NS_OK;
    }
  }

  return (mPermissionManager->*testPermission)(principal, aType, aPermission);
}

nsresult PermissionDelegateHandler::GetPermissionForPermissionsAPI(
    const nsACString& aType, uint32_t* aPermission) {
  return GetPermission(aType, aPermission, false);
}

void PermissionDelegateHandler::PopulateAllDelegatedPermissions() {
  MOZ_ASSERT(mDocument);
  MOZ_ASSERT(mPermissionManager);

  // We only populate the delegated permissions for the top-level content.
  if (!mDocument->IsTopLevelContentDocument()) {
    return;
  }

  RefPtr<WindowContext> wc = mDocument->GetWindowContext();
  NS_ENSURE_TRUE_VOID(wc);

  DelegatedPermissionList list;
  DelegatedPermissionList exactHostMatchList;

  for (const auto& perm : sPermissionsMap) {
    size_t idx = std::distance(sPermissionsMap, &perm);

    nsDependentCString type(perm.mPermissionName);
    // Populate the permission.
    uint32_t permission = nsIPermissionManager::UNKNOWN_ACTION;
    Unused << mPermissionManager->TestPermissionFromPrincipal(mPrincipal, type,
                                                              &permission);
    list.mPermissions[idx] = permission;

    // Populate the exact-host-match permission.
    permission = nsIPermissionManager::UNKNOWN_ACTION;
    Unused << mPermissionManager->TestExactPermissionFromPrincipal(
        mPrincipal, type, &permission);
    exactHostMatchList.mPermissions[idx] = permission;
  }

  WindowContext::Transaction txn;
  txn.SetDelegatedPermissions(list);
  txn.SetDelegatedExactHostMatchPermissions(exactHostMatchList);
  txn.Commit(wc);
}

void PermissionDelegateHandler::UpdateDelegatedPermission(
    const nsACString& aType) {
  MOZ_ASSERT(mDocument);
  MOZ_ASSERT(mPermissionManager);

  // We only update the delegated permission for the top-level content.
  if (!mDocument->IsTopLevelContentDocument()) {
    return;
  }

  RefPtr<WindowContext> wc = mDocument->GetWindowContext();
  NS_ENSURE_TRUE_VOID(wc);

  const DelegateInfo* info =
      GetPermissionDelegateInfo(NS_ConvertUTF8toUTF16(aType));
  NS_ENSURE_TRUE_VOID(info);
  size_t idx = std::distance(sPermissionsMap, info);

  WindowContext::Transaction txn;
  bool changed = false;
  DelegatedPermissionList list = wc->GetDelegatedPermissions();

  if (UpdateDelegatePermissionInternal(
          list, aType, idx,
          &nsIPermissionManager::TestPermissionFromPrincipal)) {
    txn.SetDelegatedPermissions(list);
    changed = true;
  }

  DelegatedPermissionList exactHostMatchList =
      wc->GetDelegatedExactHostMatchPermissions();

  if (UpdateDelegatePermissionInternal(
          exactHostMatchList, aType, idx,
          &nsIPermissionManager::TestExactPermissionFromPrincipal)) {
    txn.SetDelegatedExactHostMatchPermissions(exactHostMatchList);
    changed = true;
  }

  // We only commit if there is any change of permissions.
  if (changed) {
    txn.Commit(wc);
  }
}

bool PermissionDelegateHandler::UpdateDelegatePermissionInternal(
    PermissionDelegateHandler::DelegatedPermissionList& aList,
    const nsACString& aType, size_t aIdx,
    nsresult (NS_STDCALL nsIPermissionManager::*aTestFunc)(nsIPrincipal*,
                                                           const nsACString&,
                                                           uint32_t*)) {
  MOZ_ASSERT(aTestFunc);
  MOZ_ASSERT(mPermissionManager);
  MOZ_ASSERT(mPrincipal);

  uint32_t permission = nsIPermissionManager::UNKNOWN_ACTION;
  Unused << (mPermissionManager->*aTestFunc)(mPrincipal, aType, &permission);

  if (aList.mPermissions[aIdx] != permission) {
    aList.mPermissions[aIdx] = permission;
    return true;
  }

  return false;
}

}  // namespace mozilla