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/* -*- 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 "nsCSPUtils.h"
#include "nsDebug.h"
#include "nsIConsoleService.h"
#include "nsICryptoHash.h"
#include "nsIScriptError.h"
#include "nsIServiceManager.h"
#include "nsIStringBundle.h"
#include "nsIURL.h"
#include "nsReadableUtils.h"

static PRLogModuleInfo*
GetCspUtilsLog()
{
  static PRLogModuleInfo* gCspUtilsPRLog;
  if (!gCspUtilsPRLog)
    gCspUtilsPRLog = PR_NewLogModule("CSPUtils");
  return gCspUtilsPRLog;
}

#define CSPUTILSLOG(args) MOZ_LOG(GetCspUtilsLog(), mozilla::LogLevel::Debug, args)
#define CSPUTILSLOGENABLED() MOZ_LOG_TEST(GetCspUtilsLog(), mozilla::LogLevel::Debug)

void
CSP_GetLocalizedStr(const char16_t* aName,
                    const char16_t** aParams,
                    uint32_t aLength,
                    char16_t** outResult)
{
  nsCOMPtr<nsIStringBundle> keyStringBundle;
  nsCOMPtr<nsIStringBundleService> stringBundleService =
    mozilla::services::GetStringBundleService();

  NS_ASSERTION(stringBundleService, "String bundle service must be present!");
  stringBundleService->CreateBundle("chrome://global/locale/security/csp.properties",
                                      getter_AddRefs(keyStringBundle));

  NS_ASSERTION(keyStringBundle, "Key string bundle must be available!");

  if (!keyStringBundle) {
    return;
  }
  keyStringBundle->FormatStringFromName(aName, aParams, aLength, outResult);
}

void
CSP_LogStrMessage(const nsAString& aMsg)
{
  nsCOMPtr<nsIConsoleService> console(do_GetService("@mozilla.org/consoleservice;1"));

  if (!console) {
    return;
  }
  nsString msg = PromiseFlatString(aMsg);
  console->LogStringMessage(msg.get());
}

void
CSP_LogMessage(const nsAString& aMessage,
               const nsAString& aSourceName,
               const nsAString& aSourceLine,
               uint32_t aLineNumber,
               uint32_t aColumnNumber,
               uint32_t aFlags,
               const char *aCategory,
               uint32_t aInnerWindowID)
{
  nsCOMPtr<nsIConsoleService> console(do_GetService(NS_CONSOLESERVICE_CONTRACTID));

  nsCOMPtr<nsIScriptError> error(do_CreateInstance(NS_SCRIPTERROR_CONTRACTID));

  if (!console || !error) {
    return;
  }

  // Prepending CSP to the outgoing console message
  nsString cspMsg;
  cspMsg.Append(NS_LITERAL_STRING("Content Security Policy: "));
  cspMsg.Append(aMessage);

  nsresult rv;
  if (aInnerWindowID > 0) {
    nsCString catStr;
    catStr.AssignASCII(aCategory);
    rv = error->InitWithWindowID(cspMsg, aSourceName,
                                 aSourceLine, aLineNumber,
                                 aColumnNumber, aFlags,
                                 catStr, aInnerWindowID);
  }
  else {
    rv = error->Init(cspMsg, aSourceName,
                     aSourceLine, aLineNumber,
                     aColumnNumber, aFlags,
                     aCategory);
  }
  if (NS_FAILED(rv)) {
    return;
  }
  console->LogMessage(error);
}

/**
 * Combines CSP_LogMessage and CSP_GetLocalizedStr into one call.
 */
void
CSP_LogLocalizedStr(const char16_t* aName,
                    const char16_t** aParams,
                    uint32_t aLength,
                    const nsAString& aSourceName,
                    const nsAString& aSourceLine,
                    uint32_t aLineNumber,
                    uint32_t aColumnNumber,
                    uint32_t aFlags,
                    const char* aCategory,
                    uint32_t aInnerWindowID)
{
  nsXPIDLString logMsg;
  CSP_GetLocalizedStr(aName, aParams, aLength, getter_Copies(logMsg));
  CSP_LogMessage(logMsg, aSourceName, aSourceLine,
                 aLineNumber, aColumnNumber, aFlags,
                 aCategory, aInnerWindowID);
}

/* ===== Helpers ============================ */
CSPDirective
CSP_ContentTypeToDirective(nsContentPolicyType aType)
{
  switch (aType) {
    case nsIContentPolicy::TYPE_IMAGE:
    case nsIContentPolicy::TYPE_IMAGESET:
      return nsIContentSecurityPolicy::IMG_SRC_DIRECTIVE;

    // BLock XSLT as script, see bug 910139
    case nsIContentPolicy::TYPE_XSLT:
    case nsIContentPolicy::TYPE_SCRIPT:
      return nsIContentSecurityPolicy::SCRIPT_SRC_DIRECTIVE;

    case nsIContentPolicy::TYPE_STYLESHEET:
      return nsIContentSecurityPolicy::STYLE_SRC_DIRECTIVE;

    case nsIContentPolicy::TYPE_FONT:
      return nsIContentSecurityPolicy::FONT_SRC_DIRECTIVE;

    case nsIContentPolicy::TYPE_MEDIA:
      return nsIContentSecurityPolicy::MEDIA_SRC_DIRECTIVE;

    case nsIContentPolicy::TYPE_WEB_MANIFEST:
      return nsIContentSecurityPolicy::WEB_MANIFEST_SRC_DIRECTIVE;

    case nsIContentPolicy::TYPE_SUBDOCUMENT:
      return nsIContentSecurityPolicy::FRAME_SRC_DIRECTIVE;

    case nsIContentPolicy::TYPE_WEBSOCKET:
    case nsIContentPolicy::TYPE_XMLHTTPREQUEST:
    case nsIContentPolicy::TYPE_BEACON:
    case nsIContentPolicy::TYPE_FETCH:
      return nsIContentSecurityPolicy::CONNECT_SRC_DIRECTIVE;

    case nsIContentPolicy::TYPE_OBJECT:
    case nsIContentPolicy::TYPE_OBJECT_SUBREQUEST:
      return nsIContentSecurityPolicy::OBJECT_SRC_DIRECTIVE;

    case nsIContentPolicy::TYPE_XBL:
    case nsIContentPolicy::TYPE_PING:
    case nsIContentPolicy::TYPE_DTD:
    case nsIContentPolicy::TYPE_OTHER:
      return nsIContentSecurityPolicy::DEFAULT_SRC_DIRECTIVE;

    // csp shold not block top level loads, e.g. in case
    // of a redirect.
    case nsIContentPolicy::TYPE_DOCUMENT:
    // CSP can not block csp reports
    case nsIContentPolicy::TYPE_CSP_REPORT:
      return nsIContentSecurityPolicy::NO_DIRECTIVE;

    // Fall through to error for all other directives
    default:
      MOZ_ASSERT(false, "Can not map nsContentPolicyType to CSPDirective");
  }
  return nsIContentSecurityPolicy::DEFAULT_SRC_DIRECTIVE;
}

nsCSPHostSrc*
CSP_CreateHostSrcFromURI(nsIURI* aURI)
{
  // Create the host first
  nsCString host;
  aURI->GetHost(host);
  nsCSPHostSrc *hostsrc = new nsCSPHostSrc(NS_ConvertUTF8toUTF16(host));

  // Add the scheme.
  nsCString scheme;
  aURI->GetScheme(scheme);
  hostsrc->setScheme(NS_ConvertUTF8toUTF16(scheme));

  int32_t port;
  aURI->GetPort(&port);
  // Only add port if it's not default port.
  if (port > 0) {
    nsAutoString portStr;
    portStr.AppendInt(port);
    hostsrc->setPort(portStr);
  }
  return hostsrc;
}

bool
CSP_IsValidDirective(const nsAString& aDir)
{
  uint32_t numDirs = (sizeof(CSPStrDirectives) / sizeof(CSPStrDirectives[0]));

  for (uint32_t i = 0; i < numDirs; i++) {
    if (aDir.LowerCaseEqualsASCII(CSPStrDirectives[i])) {
      return true;
    }
  }
  return false;
}
bool
CSP_IsDirective(const nsAString& aValue, CSPDirective aDir)
{
  return aValue.LowerCaseEqualsASCII(CSP_CSPDirectiveToString(aDir));
}

bool
CSP_IsKeyword(const nsAString& aValue, enum CSPKeyword aKey)
{
  return aValue.LowerCaseEqualsASCII(CSP_EnumToKeyword(aKey));
}

bool
CSP_IsQuotelessKeyword(const nsAString& aKey)
{
  nsString lowerKey = PromiseFlatString(aKey);
  ToLowerCase(lowerKey);

  static_assert(CSP_LAST_KEYWORD_VALUE ==
                (sizeof(CSPStrKeywords) / sizeof(CSPStrKeywords[0])),
                "CSP_LAST_KEYWORD_VALUE does not match length of CSPStrKeywords");

  nsAutoString keyword;
  for (uint32_t i = 0; i < CSP_LAST_KEYWORD_VALUE; i++) {
    // skipping the leading ' and trimming the trailing '
    keyword.AssignASCII(CSPStrKeywords[i] + 1);
    keyword.Trim("'", false, true);
    if (lowerKey.Equals(keyword)) {
      return true;
    }
  }
  return false;
}

/*
 * Checks whether the current directive permits a specific
 * scheme. This function is called from nsCSPSchemeSrc() and
 * also nsCSPHostSrc.
 * @param aEnforcementScheme
 *        The scheme that this directive allows
 * @param aUri
 *        The uri of the subresource load.
 * @param aReportOnly
 *        Whether the enforced policy is report only or not.
 * @param aUpgradeInsecure
 *        Whether the policy makes use of the directive
 *        'upgrade-insecure-requests'.
 */

bool
permitsScheme(const nsAString& aEnforcementScheme,
              nsIURI* aUri,
              bool aReportOnly,
              bool aUpgradeInsecure)
{
  nsAutoCString scheme;
  nsresult rv = aUri->GetScheme(scheme);
  NS_ENSURE_SUCCESS(rv, false);

  // no scheme to enforce, let's allow the load (e.g. script-src *)
  if (aEnforcementScheme.IsEmpty()) {
    return true;
  }

  // if the scheme matches, all good - allow the load
  if (aEnforcementScheme.EqualsASCII(scheme.get())) {
    return true;
  }

  // allow scheme-less sources where the protected resource is http
  // and the load is https, see:
  // http://www.w3.org/TR/CSP2/#match-source-expression
  if (aEnforcementScheme.EqualsASCII("http") &&
      scheme.EqualsASCII("https")) {
    return true;
  }

  // Allow the load when enforcing upgrade-insecure-requests with the
  // promise the request gets upgraded from http to https and ws to wss.
  // See nsHttpChannel::Connect() and also WebSocket.cpp. Please note,
  // the report only policies should not allow the load and report
  // the error back to the page.
  return ((aUpgradeInsecure && !aReportOnly) &&
          ((scheme.EqualsASCII("http") && aEnforcementScheme.EqualsASCII("https")) ||
           (scheme.EqualsASCII("ws") && aEnforcementScheme.EqualsASCII("wss"))));
}

/* ===== nsCSPSrc ============================ */

nsCSPBaseSrc::nsCSPBaseSrc()
{
}

nsCSPBaseSrc::~nsCSPBaseSrc()
{
}

// ::permits is only called for external load requests, therefore:
// nsCSPKeywordSrc and nsCSPHashSource fall back to this base class
// implementation which will never allow the load.
bool
nsCSPBaseSrc::permits(nsIURI* aUri, const nsAString& aNonce, bool aWasRedirected,
                      bool aReportOnly, bool aUpgradeInsecure) const
{
  if (CSPUTILSLOGENABLED()) {
    nsAutoCString spec;
    aUri->GetSpec(spec);
    CSPUTILSLOG(("nsCSPBaseSrc::permits, aUri: %s", spec.get()));
  }
  return false;
}

// ::allows is only called for inlined loads, therefore:
// nsCSPSchemeSrc, nsCSPHostSrc fall back
// to this base class implementation which will never allow the load.
bool
nsCSPBaseSrc::allows(enum CSPKeyword aKeyword, const nsAString& aHashOrNonce) const
{
  CSPUTILSLOG(("nsCSPBaseSrc::allows, aKeyWord: %s, a HashOrNonce: %s",
              aKeyword == CSP_HASH ? "hash" : CSP_EnumToKeyword(aKeyword),
              NS_ConvertUTF16toUTF8(aHashOrNonce).get()));
  return false;
}

/* ====== nsCSPSchemeSrc ===================== */

nsCSPSchemeSrc::nsCSPSchemeSrc(const nsAString& aScheme)
  : mScheme(aScheme)
{
  ToLowerCase(mScheme);
}

nsCSPSchemeSrc::~nsCSPSchemeSrc()
{
}

bool
nsCSPSchemeSrc::permits(nsIURI* aUri, const nsAString& aNonce, bool aWasRedirected,
                        bool aReportOnly, bool aUpgradeInsecure) const
{
  if (CSPUTILSLOGENABLED()) {
    nsAutoCString spec;
    aUri->GetSpec(spec);
    CSPUTILSLOG(("nsCSPSchemeSrc::permits, aUri: %s", spec.get()));
  }
  MOZ_ASSERT((!mScheme.EqualsASCII("")), "scheme can not be the empty string");
  return permitsScheme(mScheme, aUri, aReportOnly, aUpgradeInsecure);
}

void
nsCSPSchemeSrc::toString(nsAString& outStr) const
{
  outStr.Append(mScheme);
  outStr.AppendASCII(":");
}

/* ===== nsCSPHostSrc ======================== */

nsCSPHostSrc::nsCSPHostSrc(const nsAString& aHost)
  : mHost(aHost)
{
  ToLowerCase(mHost);
}

nsCSPHostSrc::~nsCSPHostSrc()
{
}

bool
nsCSPHostSrc::permits(nsIURI* aUri, const nsAString& aNonce, bool aWasRedirected,
                      bool aReportOnly, bool aUpgradeInsecure) const
{
  if (CSPUTILSLOGENABLED()) {
    nsAutoCString spec;
    aUri->GetSpec(spec);
    CSPUTILSLOG(("nsCSPHostSrc::permits, aUri: %s", spec.get()));
  }

  // we are following the enforcement rules from the spec, see:
  // http://www.w3.org/TR/CSP11/#match-source-expression

  // 4.3) scheme matching: Check if the scheme matches.
  if (!permitsScheme(mScheme, aUri, aReportOnly, aUpgradeInsecure)) {
    return false;
  }

  // The host in nsCSpHostSrc should never be empty. In case we are enforcing
  // just a specific scheme, the parser should generate a nsCSPSchemeSource.
  NS_ASSERTION((!mHost.IsEmpty()), "host can not be the empty string");

  // 2) host matching: Enforce a single *
  if (mHost.EqualsASCII("*")) {
    // The single ASTERISK character (*) does not match a URI's scheme of a type
    // designating a globally unique identifier (such as blob:, data:, or filesystem:)
    // At the moment firefox does not support filesystem; but for future compatibility
    // we support it in CSP according to the spec, see: 4.2.2 Matching Source Expressions
    // Note, that whitelisting any of these schemes would call nsCSPSchemeSrc::permits().
    bool isBlobScheme =
      (NS_SUCCEEDED(aUri->SchemeIs("blob", &isBlobScheme)) && isBlobScheme);
    bool isDataScheme =
      (NS_SUCCEEDED(aUri->SchemeIs("data", &isDataScheme)) && isDataScheme);
    bool isFileScheme =
      (NS_SUCCEEDED(aUri->SchemeIs("filesystem", &isFileScheme)) && isFileScheme);

    if (isBlobScheme || isDataScheme || isFileScheme) {
      return false;
    }
    return true;
  }

  // Before we can check if the host matches, we have to
  // extract the host part from aUri.
  nsAutoCString uriHost;
  nsresult rv = aUri->GetHost(uriHost);
  NS_ENSURE_SUCCESS(rv, false);

  // 4.5) host matching: Check if the allowed host starts with a wilcard.
  if (mHost.First() == '*') {
    NS_ASSERTION(mHost[1] == '.', "Second character needs to be '.' whenever host starts with '*'");

    // Eliminate leading "*", but keeping the FULL STOP (.) thereafter before checking
    // if the remaining characters match
    nsString wildCardHost = mHost;
    wildCardHost = Substring(wildCardHost, 1, wildCardHost.Length() - 1);
    if (!StringEndsWith(NS_ConvertUTF8toUTF16(uriHost), wildCardHost)) {
      return false;
    }
  }
  // 4.6) host matching: Check if hosts match.
  else if (!mHost.Equals(NS_ConvertUTF8toUTF16(uriHost))) {
    return false;
  }

  // 4.9) Path matching: If there is a path, we have to enforce
  // path-level matching, unless the channel got redirected, see:
  // http://www.w3.org/TR/CSP11/#source-list-paths-and-redirects
  if (!aWasRedirected && !mPath.IsEmpty()) {
    // converting aUri into nsIURL so we can strip query and ref
    // example.com/test#foo     -> example.com/test
    // example.com/test?val=foo -> example.com/test
    nsCOMPtr<nsIURL> url = do_QueryInterface(aUri);
    if (!url) {
      NS_ASSERTION(false, "can't QI into nsIURI");
      return false;
    }
    nsAutoCString uriPath;
    rv = url->GetFilePath(uriPath);
    NS_ENSURE_SUCCESS(rv, false);
    // check if the last character of mPath is '/'; if so
    // we just have to check loading resource is within
    // the allowed path.
    if (mPath.Last() == '/') {
      if (!StringBeginsWith(NS_ConvertUTF8toUTF16(uriPath), mPath)) {
        return false;
      }
    }
    // otherwise mPath whitelists a specific file, and we have to
    // check if the loading resource matches that whitelisted file.
    else {
      if (!mPath.Equals(NS_ConvertUTF8toUTF16(uriPath))) {
        return false;
      }
    }
  }

  // 4.8) Port matching: If port uses wildcard, allow the load.
  if (mPort.EqualsASCII("*")) {
    return true;
  }

  // Before we can check if the port matches, we have to
  // query the port from aUri.
  int32_t uriPort;
  rv = aUri->GetPort(&uriPort);
  NS_ENSURE_SUCCESS(rv, false);

  nsAutoCString scheme;
  rv = aUri->GetScheme(scheme);
  NS_ENSURE_SUCCESS(rv, false);

  uriPort = (uriPort > 0) ? uriPort : NS_GetDefaultPort(scheme.get());

  // 4.7) Default port matching: If mPort is empty, we have to compare default ports.
  if (mPort.IsEmpty()) {
    int32_t port = NS_GetDefaultPort(NS_ConvertUTF16toUTF8(mScheme).get());
    if (port != uriPort) {
      // We should not return false for scheme-less sources where the protected resource
      // is http and the load is https, see: http://www.w3.org/TR/CSP2/#match-source-expression
      // BUT, we only allow scheme-less sources to be upgraded from http to https if CSP
      // does not explicitly define a port.
      if (!(uriPort == NS_GetDefaultPort("https"))) {
        return false;
      }
    }
  }
  // 4.7) Port matching: Compare the ports.
  else {
    nsString portStr;
    portStr.AppendInt(uriPort);
    if (!mPort.Equals(portStr)) {
      return false;
    }
  }

  // At the end: scheme, host, path, and port match -> allow the load.
  return true;
}

void
nsCSPHostSrc::toString(nsAString& outStr) const
{
  // If mHost is a single "*", we append the wildcard and return.
  if (mHost.EqualsASCII("*") &&
      mScheme.IsEmpty() &&
      mPort.IsEmpty()) {
    outStr.Append(mHost);
    return;
  }

  // append scheme
  outStr.Append(mScheme);

  // append host
  outStr.AppendASCII("://");
  outStr.Append(mHost);

  // append port
  if (!mPort.IsEmpty()) {
    outStr.AppendASCII(":");
    outStr.Append(mPort);
  }

  // append path
  outStr.Append(mPath);
}

void
nsCSPHostSrc::setScheme(const nsAString& aScheme)
{
  mScheme = aScheme;
  ToLowerCase(mScheme);
}

void
nsCSPHostSrc::setPort(const nsAString& aPort)
{
  mPort = aPort;
}

void
nsCSPHostSrc::appendPath(const nsAString& aPath)
{
  mPath.Append(aPath);
}

/* ===== nsCSPKeywordSrc ===================== */

nsCSPKeywordSrc::nsCSPKeywordSrc(enum CSPKeyword aKeyword)
 : mKeyword(aKeyword)
 , mInvalidated(false)
{
  NS_ASSERTION((aKeyword != CSP_SELF),
               "'self' should have been replaced in the parser");
}

nsCSPKeywordSrc::~nsCSPKeywordSrc()
{
}

bool
nsCSPKeywordSrc::allows(enum CSPKeyword aKeyword, const nsAString& aHashOrNonce) const
{
  CSPUTILSLOG(("nsCSPKeywordSrc::allows, aKeyWord: %s, aHashOrNonce: %s, mInvalidated: %s",
              CSP_EnumToKeyword(aKeyword),
              NS_ConvertUTF16toUTF8(aHashOrNonce).get(),
              mInvalidated ? "yes" : "false"));
  // if unsafe-inline should be ignored, then bail early
  if (mInvalidated) {
    NS_ASSERTION(mKeyword == CSP_UNSAFE_INLINE,
                 "should only invalidate unsafe-inline within script-src");
    return false;
  }
  return mKeyword == aKeyword;
}

void
nsCSPKeywordSrc::toString(nsAString& outStr) const
{
  if (mInvalidated) {
    MOZ_ASSERT(mKeyword == CSP_UNSAFE_INLINE,
               "can only ignore 'unsafe-inline' within toString()");
    return;
  }
  outStr.AppendASCII(CSP_EnumToKeyword(mKeyword));
}

void
nsCSPKeywordSrc::invalidate()
{
  mInvalidated = true;
  MOZ_ASSERT(mKeyword == CSP_UNSAFE_INLINE,
             "invalidate 'unsafe-inline' only within script-src");
}

/* ===== nsCSPNonceSrc ==================== */

nsCSPNonceSrc::nsCSPNonceSrc(const nsAString& aNonce)
  : mNonce(aNonce)
{
}

nsCSPNonceSrc::~nsCSPNonceSrc()
{
}

bool
nsCSPNonceSrc::permits(nsIURI* aUri, const nsAString& aNonce, bool aWasRedirected,
                       bool aReportOnly, bool aUpgradeInsecure) const
{
  if (CSPUTILSLOGENABLED()) {
    nsAutoCString spec;
    aUri->GetSpec(spec);
    CSPUTILSLOG(("nsCSPNonceSrc::permits, aUri: %s, aNonce: %s",
                spec.get(), NS_ConvertUTF16toUTF8(aNonce).get()));
  }

  return mNonce.Equals(aNonce);
}

bool
nsCSPNonceSrc::allows(enum CSPKeyword aKeyword, const nsAString& aHashOrNonce) const
{
  CSPUTILSLOG(("nsCSPNonceSrc::allows, aKeyWord: %s, a HashOrNonce: %s",
              CSP_EnumToKeyword(aKeyword), NS_ConvertUTF16toUTF8(aHashOrNonce).get()));

  if (aKeyword != CSP_NONCE) {
    return false;
  }
  return mNonce.Equals(aHashOrNonce);
}

void
nsCSPNonceSrc::toString(nsAString& outStr) const
{
  outStr.AppendASCII(CSP_EnumToKeyword(CSP_NONCE));
  outStr.Append(mNonce);
  outStr.AppendASCII("'");
}

/* ===== nsCSPHashSrc ===================== */

nsCSPHashSrc::nsCSPHashSrc(const nsAString& aAlgo, const nsAString& aHash)
 : mAlgorithm(aAlgo)
 , mHash(aHash)
{
  // Only the algo should be rewritten to lowercase, the hash must remain the same.
  ToLowerCase(mAlgorithm);
}

nsCSPHashSrc::~nsCSPHashSrc()
{
}

bool
nsCSPHashSrc::allows(enum CSPKeyword aKeyword, const nsAString& aHashOrNonce) const
{
  CSPUTILSLOG(("nsCSPHashSrc::allows, aKeyWord: %s, a HashOrNonce: %s",
              CSP_EnumToKeyword(aKeyword), NS_ConvertUTF16toUTF8(aHashOrNonce).get()));

  if (aKeyword != CSP_HASH) {
    return false;
  }

  // Convert aHashOrNonce to UTF-8
  NS_ConvertUTF16toUTF8 utf8_hash(aHashOrNonce);

  nsresult rv;
  nsCOMPtr<nsICryptoHash> hasher;
  hasher = do_CreateInstance("@mozilla.org/security/hash;1", &rv);
  NS_ENSURE_SUCCESS(rv, false);

  rv = hasher->InitWithString(NS_ConvertUTF16toUTF8(mAlgorithm));
  NS_ENSURE_SUCCESS(rv, false);

  rv = hasher->Update((uint8_t *)utf8_hash.get(), utf8_hash.Length());
  NS_ENSURE_SUCCESS(rv, false);

  nsAutoCString hash;
  rv = hasher->Finish(true, hash);
  NS_ENSURE_SUCCESS(rv, false);

  // The NSS Base64 encoder automatically adds linebreaks "\r\n" every 64
  // characters. We need to remove these so we can properly validate longer
  // (SHA-512) base64-encoded hashes
  hash.StripChars("\r\n");
  return NS_ConvertUTF16toUTF8(mHash).Equals(hash);
}

void
nsCSPHashSrc::toString(nsAString& outStr) const
{
  outStr.AppendASCII("'");
  outStr.Append(mAlgorithm);
  outStr.AppendASCII("-");
  outStr.Append(mHash);
  outStr.AppendASCII("'");
}

/* ===== nsCSPReportURI ===================== */

nsCSPReportURI::nsCSPReportURI(nsIURI *aURI)
  :mReportURI(aURI)
{
}

nsCSPReportURI::~nsCSPReportURI()
{
}

void
nsCSPReportURI::toString(nsAString& outStr) const
{
  nsAutoCString spec;
  nsresult rv = mReportURI->GetSpec(spec);
  if (NS_FAILED(rv)) {
    return;
  }
  outStr.AppendASCII(spec.get());
}

/* ===== nsCSPDirective ====================== */

nsCSPDirective::nsCSPDirective(CSPDirective aDirective)
{
  mDirective = aDirective;
}

nsCSPDirective::~nsCSPDirective()
{
  for (uint32_t i = 0; i < mSrcs.Length(); i++) {
    delete mSrcs[i];
  }
}

bool
nsCSPDirective::permits(nsIURI* aUri, const nsAString& aNonce, bool aWasRedirected,
                        bool aReportOnly, bool aUpgradeInsecure) const
{
  if (CSPUTILSLOGENABLED()) {
    nsAutoCString spec;
    aUri->GetSpec(spec);
    CSPUTILSLOG(("nsCSPDirective::permits, aUri: %s", spec.get()));
  }

  for (uint32_t i = 0; i < mSrcs.Length(); i++) {
    if (mSrcs[i]->permits(aUri, aNonce, aWasRedirected, aReportOnly, aUpgradeInsecure)) {
      return true;
    }
  }
  return false;
}

bool
nsCSPDirective::allows(enum CSPKeyword aKeyword, const nsAString& aHashOrNonce) const
{
  CSPUTILSLOG(("nsCSPDirective::allows, aKeyWord: %s, a HashOrNonce: %s",
              CSP_EnumToKeyword(aKeyword), NS_ConvertUTF16toUTF8(aHashOrNonce).get()));

  for (uint32_t i = 0; i < mSrcs.Length(); i++) {
    if (mSrcs[i]->allows(aKeyword, aHashOrNonce)) {
      return true;
    }
  }
  return false;
}

void
nsCSPDirective::toString(nsAString& outStr) const
{
  // Append directive name
  outStr.AppendASCII(CSP_CSPDirectiveToString(mDirective));
  outStr.AppendASCII(" ");

  // Append srcs
  uint32_t length = mSrcs.Length();
  for (uint32_t i = 0; i < length; i++) {
    mSrcs[i]->toString(outStr);
    if (i != (length - 1)) {
      outStr.AppendASCII(" ");
    }
  }
}

void
nsCSPDirective::toDomCSPStruct(mozilla::dom::CSP& outCSP) const
{
  mozilla::dom::Sequence<nsString> srcs;
  nsString src;
  for (uint32_t i = 0; i < mSrcs.Length(); i++) {
    src.Truncate();
    mSrcs[i]->toString(src);
    srcs.AppendElement(src, mozilla::fallible);
  }

  switch(mDirective) {
    case nsIContentSecurityPolicy::DEFAULT_SRC_DIRECTIVE:
      outCSP.mDefault_src.Construct();
      outCSP.mDefault_src.Value() = mozilla::Move(srcs);
      return;

    case nsIContentSecurityPolicy::SCRIPT_SRC_DIRECTIVE:
      outCSP.mScript_src.Construct();
      outCSP.mScript_src.Value() = mozilla::Move(srcs);
      return;

    case nsIContentSecurityPolicy::OBJECT_SRC_DIRECTIVE:
      outCSP.mObject_src.Construct();
      outCSP.mObject_src.Value() = mozilla::Move(srcs);
      return;

    case nsIContentSecurityPolicy::STYLE_SRC_DIRECTIVE:
      outCSP.mStyle_src.Construct();
      outCSP.mStyle_src.Value() = mozilla::Move(srcs);
      return;

    case nsIContentSecurityPolicy::IMG_SRC_DIRECTIVE:
      outCSP.mImg_src.Construct();
      outCSP.mImg_src.Value() = mozilla::Move(srcs);
      return;

    case nsIContentSecurityPolicy::MEDIA_SRC_DIRECTIVE:
      outCSP.mMedia_src.Construct();
      outCSP.mMedia_src.Value() = mozilla::Move(srcs);
      return;

    case nsIContentSecurityPolicy::FRAME_SRC_DIRECTIVE:
      outCSP.mFrame_src.Construct();
      outCSP.mFrame_src.Value() = mozilla::Move(srcs);
      return;

    case nsIContentSecurityPolicy::FONT_SRC_DIRECTIVE:
      outCSP.mFont_src.Construct();
      outCSP.mFont_src.Value() = mozilla::Move(srcs);
      return;

    case nsIContentSecurityPolicy::CONNECT_SRC_DIRECTIVE:
      outCSP.mConnect_src.Construct();
      outCSP.mConnect_src.Value() = mozilla::Move(srcs);
      return;

    case nsIContentSecurityPolicy::REPORT_URI_DIRECTIVE:
      outCSP.mReport_uri.Construct();
      outCSP.mReport_uri.Value() = mozilla::Move(srcs);
      return;

    case nsIContentSecurityPolicy::FRAME_ANCESTORS_DIRECTIVE:
      outCSP.mFrame_ancestors.Construct();
      outCSP.mFrame_ancestors.Value() = mozilla::Move(srcs);
      return;

    case nsIContentSecurityPolicy::WEB_MANIFEST_SRC_DIRECTIVE:
      outCSP.mManifest_src.Construct();
      outCSP.mManifest_src.Value() = mozilla::Move(srcs);
      return;
    // not supporting REFLECTED_XSS_DIRECTIVE

    case nsIContentSecurityPolicy::BASE_URI_DIRECTIVE:
      outCSP.mBase_uri.Construct();
      outCSP.mBase_uri.Value() = mozilla::Move(srcs);
      return;

    case nsIContentSecurityPolicy::FORM_ACTION_DIRECTIVE:
      outCSP.mForm_action.Construct();
      outCSP.mForm_action.Value() = mozilla::Move(srcs);
      return;

    case nsIContentSecurityPolicy::UPGRADE_IF_INSECURE_DIRECTIVE:
      outCSP.mUpgrade_insecure_requests.Construct();
      // does not have any srcs
      return;

    // REFERRER_DIRECTIVE is handled in nsCSPPolicy::toDomCSPStruct()

    default:
      NS_ASSERTION(false, "cannot find directive to convert CSP to JSON");
  }
}


bool
nsCSPDirective::restrictsContentType(nsContentPolicyType aContentType) const
{
  // make sure we do not check for the default src before any other sources
  if (isDefaultDirective()) {
    return false;
  }
  return mDirective == CSP_ContentTypeToDirective(aContentType);
}

void
nsCSPDirective::getReportURIs(nsTArray<nsString> &outReportURIs) const
{
  NS_ASSERTION((mDirective == nsIContentSecurityPolicy::REPORT_URI_DIRECTIVE), "not a report-uri directive");

  // append uris
  nsString tmpReportURI;
  for (uint32_t i = 0; i < mSrcs.Length(); i++) {
    tmpReportURI.Truncate();
    mSrcs[i]->toString(tmpReportURI);
    outReportURIs.AppendElement(tmpReportURI);
  }
}

/* =============== nsUpgradeInsecureDirective ============= */

nsUpgradeInsecureDirective::nsUpgradeInsecureDirective(CSPDirective aDirective)
: nsCSPDirective(aDirective)
{
}

nsUpgradeInsecureDirective::~nsUpgradeInsecureDirective()
{
}

void
nsUpgradeInsecureDirective::toString(nsAString& outStr) const
{
  outStr.AppendASCII(CSP_CSPDirectiveToString(
    nsIContentSecurityPolicy::UPGRADE_IF_INSECURE_DIRECTIVE));
}

/* ===== nsCSPPolicy ========================= */

nsCSPPolicy::nsCSPPolicy()
  : mUpgradeInsecDir(nullptr)
  , mReportOnly(false)
{
  CSPUTILSLOG(("nsCSPPolicy::nsCSPPolicy"));
}

nsCSPPolicy::~nsCSPPolicy()
{
  CSPUTILSLOG(("nsCSPPolicy::~nsCSPPolicy"));

  for (uint32_t i = 0; i < mDirectives.Length(); i++) {
    delete mDirectives[i];
  }
}

bool
nsCSPPolicy::permits(CSPDirective aDir,
                     nsIURI* aUri,
                     bool aSpecific) const
{
  nsString outp;
  return this->permits(aDir, aUri, EmptyString(), false, aSpecific, outp);
}

bool
nsCSPPolicy::permits(CSPDirective aDir,
                     nsIURI* aUri,
                     const nsAString& aNonce,
                     bool aWasRedirected,
                     bool aSpecific,
                     nsAString& outViolatedDirective) const
{
  if (CSPUTILSLOGENABLED()) {
    nsAutoCString spec;
    aUri->GetSpec(spec);
    CSPUTILSLOG(("nsCSPPolicy::permits, aUri: %s, aDir: %d, aSpecific: %s",
                 spec.get(), aDir, aSpecific ? "true" : "false"));
  }

  NS_ASSERTION(aUri, "permits needs an uri to perform the check!");

  nsCSPDirective* defaultDir = nullptr;

  // Try to find a relevant directive
  // These directive arrays are short (1-5 elements), not worth using a hashtable.
  for (uint32_t i = 0; i < mDirectives.Length(); i++) {
    if (mDirectives[i]->equals(aDir)) {
      if (!mDirectives[i]->permits(aUri, aNonce, aWasRedirected, mReportOnly, mUpgradeInsecDir)) {
        mDirectives[i]->toString(outViolatedDirective);
        return false;
      }
      return true;
    }
    if (mDirectives[i]->isDefaultDirective()) {
      defaultDir = mDirectives[i];
    }
  }

  // If the above loop runs through, we haven't found a matching directive.
  // Avoid relooping, just store the result of default-src while looping.
  if (!aSpecific && defaultDir) {
    if (!defaultDir->permits(aUri, aNonce, aWasRedirected, mReportOnly, mUpgradeInsecDir)) {
      defaultDir->toString(outViolatedDirective);
      return false;
    }
    return true;
  }

  // Nothing restricts this, so we're allowing the load
  // See bug 764937
  return true;
}

bool
nsCSPPolicy::allows(nsContentPolicyType aContentType,
                    enum CSPKeyword aKeyword,
                    const nsAString& aHashOrNonce) const
{
  CSPUTILSLOG(("nsCSPPolicy::allows, aKeyWord: %s, a HashOrNonce: %s",
              CSP_EnumToKeyword(aKeyword), NS_ConvertUTF16toUTF8(aHashOrNonce).get()));

  nsCSPDirective* defaultDir = nullptr;

  // Try to find a matching directive
  for (uint32_t i = 0; i < mDirectives.Length(); i++) {
    if (mDirectives[i]->restrictsContentType(aContentType)) {
      if (mDirectives[i]->allows(aKeyword, aHashOrNonce)) {
        return true;
      }
      return false;
    }
    if (mDirectives[i]->isDefaultDirective()) {
      defaultDir = mDirectives[i];
    }
  }

  // {nonce,hash}-source should not consult default-src:
  //   * return false if default-src is specified
  //   * but allow the load if default-src is *not* specified (Bug 1198422)
  if (aKeyword == CSP_NONCE || aKeyword == CSP_HASH) {
     if (!defaultDir) {
       return true;
     }
    return false;
  }

  // If the above loop runs through, we haven't found a matching directive.
  // Avoid relooping, just store the result of default-src while looping.
  if (defaultDir) {
    return defaultDir->allows(aKeyword, aHashOrNonce);
  }

  // Allowing the load; see Bug 885433
  // a) inline scripts (also unsafe eval) should only be blocked
  //    if there is a [script-src] or [default-src]
  // b) inline styles should only be blocked
  //    if there is a [style-src] or [default-src]
  return true;
}

bool
nsCSPPolicy::allows(nsContentPolicyType aContentType,
                    enum CSPKeyword aKeyword) const
{
  return allows(aContentType, aKeyword, NS_LITERAL_STRING(""));
}

void
nsCSPPolicy::toString(nsAString& outStr) const
{
  uint32_t length = mDirectives.Length();
  for (uint32_t i = 0; i < length; ++i) {

    if (mDirectives[i]->equals(nsIContentSecurityPolicy::REFERRER_DIRECTIVE)) {
      outStr.AppendASCII(CSP_CSPDirectiveToString(nsIContentSecurityPolicy::REFERRER_DIRECTIVE));
      outStr.AppendASCII(" ");
      outStr.Append(mReferrerPolicy);
    } else {
      mDirectives[i]->toString(outStr);
    }
    if (i != (length - 1)) {
      outStr.AppendASCII("; ");
    }
  }
}

void
nsCSPPolicy::toDomCSPStruct(mozilla::dom::CSP& outCSP) const
{
  outCSP.mReport_only = mReportOnly;

  for (uint32_t i = 0; i < mDirectives.Length(); ++i) {
    if (mDirectives[i]->equals(nsIContentSecurityPolicy::REFERRER_DIRECTIVE)) {
      mozilla::dom::Sequence<nsString> srcs;
      srcs.AppendElement(mReferrerPolicy, mozilla::fallible);
      outCSP.mReferrer.Construct();
      outCSP.mReferrer.Value() = srcs;
    } else {
      mDirectives[i]->toDomCSPStruct(outCSP);
    }
  }
}

bool
nsCSPPolicy::hasDirective(CSPDirective aDir) const
{
  for (uint32_t i = 0; i < mDirectives.Length(); i++) {
    if (mDirectives[i]->equals(aDir)) {
      return true;
    }
  }
  return false;
}

/*
 * Use this function only after ::allows() returned 'false'. Most and
 * foremost it's used to get the violated directive before sending reports.
 * The parameter outDirective is the equivalent of 'outViolatedDirective'
 * for the ::permits() function family.
 */
void
nsCSPPolicy::getDirectiveStringForContentType(nsContentPolicyType aContentType,
                                              nsAString& outDirective) const
{
  nsCSPDirective* defaultDir = nullptr;
  for (uint32_t i = 0; i < mDirectives.Length(); i++) {
    if (mDirectives[i]->restrictsContentType(aContentType)) {
      mDirectives[i]->toString(outDirective);
      return;
    }
    if (mDirectives[i]->isDefaultDirective()) {
      defaultDir = mDirectives[i];
    }
  }
  // if we haven't found a matching directive yet,
  // the contentType must be restricted by the default directive
  if (defaultDir) {
    defaultDir->toString(outDirective);
    return;
  }
  NS_ASSERTION(false, "Can not query directive string for contentType!");
  outDirective.AppendASCII("couldNotQueryViolatedDirective");
}

void
nsCSPPolicy::getDirectiveAsString(CSPDirective aDir, nsAString& outDirective) const
{
  for (uint32_t i = 0; i < mDirectives.Length(); i++) {
    if (mDirectives[i]->equals(aDir)) {
      mDirectives[i]->toString(outDirective);
      return;
    }
  }
}

void
nsCSPPolicy::getReportURIs(nsTArray<nsString>& outReportURIs) const
{
  for (uint32_t i = 0; i < mDirectives.Length(); i++) {
    if (mDirectives[i]->equals(nsIContentSecurityPolicy::REPORT_URI_DIRECTIVE)) {
      mDirectives[i]->getReportURIs(outReportURIs);
      return;
    }
  }
}