Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1913 insertions, 0 deletions

diff --git a/netwerk/protocol/http/nsHttpChannelAuthProvider.cpp b/netwerk/protocol/http/nsHttpChannelAuthProvider.cpp
new file mode 100644
index 0000000000..8e7df0ae3d
--- /dev/null
+++ b/netwerk/protocol/http/nsHttpChannelAuthProvider.cpp
@@ -0,0 +1,1913 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set expandtab ts=4 sw=2 sts=2 cin: */
+/* 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/. */
+
+// HttpLog.h should generally be included first
+#include "HttpLog.h"
+
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/StoragePrincipalHelper.h"
+#include "mozilla/Tokenizer.h"
+#include "MockHttpAuth.h"
+#include "nsHttpChannelAuthProvider.h"
+#include "nsCRT.h"
+#include "nsNetUtil.h"
+#include "nsHttpHandler.h"
+#include "nsIHttpAuthenticator.h"
+#include "nsIHttpChannelInternal.h"
+#include "nsIAuthPrompt2.h"
+#include "nsIAuthPromptProvider.h"
+#include "nsIInterfaceRequestor.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsEscape.h"
+#include "nsAuthInformationHolder.h"
+#include "nsIStringBundle.h"
+#include "nsIPromptService.h"
+#include "netCore.h"
+#include "nsIHttpAuthenticableChannel.h"
+#include "nsIURI.h"
+#include "nsContentUtils.h"
+#include "nsHttp.h"
+#include "nsHttpBasicAuth.h"
+#include "nsHttpDigestAuth.h"
+#ifdef MOZ_AUTH_EXTENSION
+#  include "nsHttpNegotiateAuth.h"
+#endif
+#include "nsHttpNTLMAuth.h"
+#include "nsServiceManagerUtils.h"
+#include "nsIURL.h"
+#include "mozilla/StaticPrefs_network.h"
+#include "mozilla/StaticPrefs_prompts.h"
+#include "mozilla/Telemetry.h"
+#include "nsIProxiedChannel.h"
+#include "nsIProxyInfo.h"
+
+namespace mozilla::net {
+
+#define SUBRESOURCE_AUTH_DIALOG_DISALLOW_ALL 0
+#define SUBRESOURCE_AUTH_DIALOG_DISALLOW_CROSS_ORIGIN 1
+#define SUBRESOURCE_AUTH_DIALOG_ALLOW_ALL 2
+
+#define HTTP_AUTH_DIALOG_TOP_LEVEL_DOC 29
+#define HTTP_AUTH_DIALOG_SAME_ORIGIN_SUBRESOURCE 30
+#define HTTP_AUTH_DIALOG_SAME_ORIGIN_XHR 31
+#define HTTP_AUTH_DIALOG_NON_WEB_CONTENT 32
+
+#define HTTP_AUTH_BASIC_INSECURE 0
+#define HTTP_AUTH_BASIC_SECURE 1
+#define HTTP_AUTH_DIGEST_INSECURE 2
+#define HTTP_AUTH_DIGEST_SECURE 3
+#define HTTP_AUTH_NTLM_INSECURE 4
+#define HTTP_AUTH_NTLM_SECURE 5
+#define HTTP_AUTH_NEGOTIATE_INSECURE 6
+#define HTTP_AUTH_NEGOTIATE_SECURE 7
+
+#define MAX_DISPLAYED_USER_LENGTH 64
+#define MAX_DISPLAYED_HOST_LENGTH 64
+
+static void GetOriginAttributesSuffix(nsIChannel* aChan, nsACString& aSuffix) {
+  OriginAttributes oa;
+
+  // Deliberately ignoring the result and going with defaults
+  if (aChan) {
+    StoragePrincipalHelper::GetOriginAttributesForNetworkState(aChan, oa);
+  }
+
+  oa.CreateSuffix(aSuffix);
+}
+
+nsHttpChannelAuthProvider::nsHttpChannelAuthProvider()
+    : mProxyAuth(false),
+      mTriedProxyAuth(false),
+      mTriedHostAuth(false),
+      mSuppressDefensiveAuth(false),
+      mCrossOrigin(false),
+      mConnectionBased(false),
+      mHttpHandler(gHttpHandler) {}
+
+nsHttpChannelAuthProvider::~nsHttpChannelAuthProvider() {
+  MOZ_RELEASE_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!mAuthChannel, "Disconnect wasn't called");
+}
+
+NS_IMETHODIMP
+nsHttpChannelAuthProvider::Init(nsIHttpAuthenticableChannel* channel) {
+  MOZ_ASSERT(channel, "channel expected!");
+
+  mAuthChannel = channel;
+
+  nsresult rv = mAuthChannel->GetURI(getter_AddRefs(mURI));
+  if (NS_FAILED(rv)) return rv;
+
+  rv = mAuthChannel->GetIsSSL(&mUsingSSL);
+  if (NS_FAILED(rv)) return rv;
+
+  nsCOMPtr<nsIProxiedChannel> proxied(channel);
+  if (proxied) {
+    nsCOMPtr<nsIProxyInfo> pi;
+    rv = proxied->GetProxyInfo(getter_AddRefs(pi));
+    if (NS_FAILED(rv)) return rv;
+
+    if (pi) {
+      nsAutoCString proxyType;
+      rv = pi->GetType(proxyType);
+      if (NS_FAILED(rv)) return rv;
+
+      mProxyUsingSSL = proxyType.EqualsLiteral("https");
+    }
+  }
+
+  rv = mURI->GetAsciiHost(mHost);
+  if (NS_FAILED(rv)) return rv;
+
+  // reject the URL if it doesn't specify a host
+  if (mHost.IsEmpty()) return NS_ERROR_MALFORMED_URI;
+
+  rv = mURI->GetPort(&mPort);
+  if (NS_FAILED(rv)) return rv;
+
+  nsCOMPtr<nsIChannel> bareChannel = do_QueryInterface(channel);
+  mIsPrivate = NS_UsePrivateBrowsing(bareChannel);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsHttpChannelAuthProvider::ProcessAuthentication(uint32_t httpStatus,
+                                                 bool SSLConnectFailed) {
+  LOG(
+      ("nsHttpChannelAuthProvider::ProcessAuthentication "
+       "[this=%p channel=%p code=%u SSLConnectFailed=%d]\n",
+       this, mAuthChannel, httpStatus, SSLConnectFailed));
+
+  MOZ_ASSERT(mAuthChannel, "Channel not initialized");
+
+  nsCOMPtr<nsIProxyInfo> proxyInfo;
+  nsresult rv = mAuthChannel->GetProxyInfo(getter_AddRefs(proxyInfo));
+  if (NS_FAILED(rv)) return rv;
+  if (proxyInfo) {
+    mProxyInfo = do_QueryInterface(proxyInfo);
+    if (!mProxyInfo) return NS_ERROR_NO_INTERFACE;
+  }
+
+  nsAutoCString challenges;
+  mProxyAuth = (httpStatus == 407);
+
+  rv = PrepareForAuthentication(mProxyAuth);
+  if (NS_FAILED(rv)) return rv;
+
+  if (mProxyAuth) {
+    // only allow a proxy challenge if we have a proxy server configured.
+    // otherwise, we could inadvertently expose the user's proxy
+    // credentials to an origin server.  We could attempt to proceed as
+    // if we had received a 401 from the server, but why risk flirting
+    // with trouble?  IE similarly rejects 407s when a proxy server is
+    // not configured, so there's no reason not to do the same.
+    if (!UsingHttpProxy()) {
+      LOG(("rejecting 407 when proxy server not configured!\n"));
+      return NS_ERROR_UNEXPECTED;
+    }
+    if (UsingSSL() && !SSLConnectFailed) {
+      // we need to verify that this challenge came from the proxy
+      // server itself, and not some server on the other side of the
+      // SSL tunnel.
+      LOG(("rejecting 407 from origin server!\n"));
+      return NS_ERROR_UNEXPECTED;
+    }
+    rv = mAuthChannel->GetProxyChallenges(challenges);
+  } else {
+    rv = mAuthChannel->GetWWWChallenges(challenges);
+  }
+  if (NS_FAILED(rv)) return rv;
+
+  nsAutoCString creds;
+  rv = GetCredentials(challenges, mProxyAuth, creds);
+  if (rv == NS_ERROR_IN_PROGRESS) return rv;
+  if (NS_FAILED(rv)) {
+    LOG(("unable to authenticate\n"));
+  } else {
+    // set the authentication credentials
+    if (mProxyAuth) {
+      rv = mAuthChannel->SetProxyCredentials(creds);
+    } else {
+      rv = mAuthChannel->SetWWWCredentials(creds);
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP
+nsHttpChannelAuthProvider::AddAuthorizationHeaders(
+    bool aDontUseCachedWWWCreds) {
+  LOG(
+      ("nsHttpChannelAuthProvider::AddAuthorizationHeaders? "
+       "[this=%p channel=%p]\n",
+       this, mAuthChannel));
+
+  MOZ_ASSERT(mAuthChannel, "Channel not initialized");
+
+  nsCOMPtr<nsIProxyInfo> proxyInfo;
+  nsresult rv = mAuthChannel->GetProxyInfo(getter_AddRefs(proxyInfo));
+  if (NS_FAILED(rv)) return rv;
+  if (proxyInfo) {
+    mProxyInfo = do_QueryInterface(proxyInfo);
+    if (!mProxyInfo) return NS_ERROR_NO_INTERFACE;
+  }
+
+  uint32_t loadFlags;
+  rv = mAuthChannel->GetLoadFlags(&loadFlags);
+  if (NS_FAILED(rv)) return rv;
+
+  // this getter never fails
+  nsHttpAuthCache* authCache = gHttpHandler->AuthCache(mIsPrivate);
+
+  // check if proxy credentials should be sent
+  if (!ProxyHost().IsEmpty() && UsingHttpProxy()) {
+    SetAuthorizationHeader(authCache, nsHttp::Proxy_Authorization, "http"_ns,
+                           ProxyHost(), ProxyPort(),
+                           ""_ns,  // proxy has no path
+                           mProxyIdent);
+  }
+
+  if (loadFlags & nsIRequest::LOAD_ANONYMOUS) {
+    LOG(("Skipping Authorization header for anonymous load\n"));
+    return NS_OK;
+  }
+
+  if (aDontUseCachedWWWCreds) {
+    LOG(
+        ("Authorization header already present:"
+         " skipping adding auth header from cache\n"));
+    return NS_OK;
+  }
+
+  // check if server credentials should be sent
+  nsAutoCString path, scheme;
+  if (NS_SUCCEEDED(GetCurrentPath(path)) &&
+      NS_SUCCEEDED(mURI->GetScheme(scheme))) {
+    SetAuthorizationHeader(authCache, nsHttp::Authorization, scheme, Host(),
+                           Port(), path, mIdent);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsHttpChannelAuthProvider::CheckForSuperfluousAuth() {
+  LOG(
+      ("nsHttpChannelAuthProvider::CheckForSuperfluousAuth? "
+       "[this=%p channel=%p]\n",
+       this, mAuthChannel));
+
+  MOZ_ASSERT(mAuthChannel, "Channel not initialized");
+
+  // we've been called because it has been determined that this channel is
+  // getting loaded without taking the userpass from the URL.  if the URL
+  // contained a userpass, then (provided some other conditions are true),
+  // we'll give the user an opportunity to abort the channel as this might be
+  // an attempt to spoof a different site (see bug 232567).
+  if (!ConfirmAuth("SuperfluousAuth", true)) {
+    // calling cancel here sets our mStatus and aborts the HTTP
+    // transaction, which prevents OnDataAvailable events.
+    Unused << mAuthChannel->Cancel(NS_ERROR_SUPERFLUOS_AUTH);
+    return NS_ERROR_SUPERFLUOS_AUTH;
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsHttpChannelAuthProvider::Cancel(nsresult status) {
+  MOZ_ASSERT(mAuthChannel, "Channel not initialized");
+
+  if (mAsyncPromptAuthCancelable) {
+    mAsyncPromptAuthCancelable->Cancel(status);
+    mAsyncPromptAuthCancelable = nullptr;
+  }
+
+  if (mGenerateCredentialsCancelable) {
+    mGenerateCredentialsCancelable->Cancel(status);
+    mGenerateCredentialsCancelable = nullptr;
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsHttpChannelAuthProvider::Disconnect(nsresult status) {
+  mAuthChannel = nullptr;
+
+  if (mAsyncPromptAuthCancelable) {
+    mAsyncPromptAuthCancelable->Cancel(status);
+    mAsyncPromptAuthCancelable = nullptr;
+  }
+
+  if (mGenerateCredentialsCancelable) {
+    mGenerateCredentialsCancelable->Cancel(status);
+    mGenerateCredentialsCancelable = nullptr;
+  }
+
+  NS_IF_RELEASE(mProxyAuthContinuationState);
+  NS_IF_RELEASE(mAuthContinuationState);
+
+  return NS_OK;
+}
+
+// helper function for getting an auth prompt from an interface requestor
+static void GetAuthPrompt(nsIInterfaceRequestor* ifreq, bool proxyAuth,
+                          nsIAuthPrompt2** result) {
+  if (!ifreq) return;
+
+  uint32_t promptReason;
+  if (proxyAuth) {
+    promptReason = nsIAuthPromptProvider::PROMPT_PROXY;
+  } else {
+    promptReason = nsIAuthPromptProvider::PROMPT_NORMAL;
+  }
+
+  nsCOMPtr<nsIAuthPromptProvider> promptProvider = do_GetInterface(ifreq);
+  if (promptProvider) {
+    promptProvider->GetAuthPrompt(promptReason, NS_GET_IID(nsIAuthPrompt2),
+                                  reinterpret_cast<void**>(result));
+  } else {
+    NS_QueryAuthPrompt2(ifreq, result);
+  }
+}
+
+// generate credentials for the given challenge, and update the auth cache.
+nsresult nsHttpChannelAuthProvider::GenCredsAndSetEntry(
+    nsIHttpAuthenticator* auth, bool proxyAuth, const nsACString& scheme,
+    const nsACString& host, int32_t port, const nsACString& directory,
+    const nsACString& realm, const nsACString& challenge,
+    const nsHttpAuthIdentity& ident, nsCOMPtr<nsISupports>& sessionState,
+    nsACString& result) {
+  nsresult rv;
+  nsISupports* ss = sessionState;
+
+  // set informations that depend on whether
+  // we're authenticating against a proxy
+  // or a webserver
+  nsISupports** continuationState;
+
+  if (proxyAuth) {
+    continuationState = &mProxyAuthContinuationState;
+  } else {
+    continuationState = &mAuthContinuationState;
+  }
+
+  rv = auth->GenerateCredentialsAsync(
+      mAuthChannel, this, challenge, proxyAuth, ident.Domain(), ident.User(),
+      ident.Password(), ss, *continuationState,
+      getter_AddRefs(mGenerateCredentialsCancelable));
+  if (NS_SUCCEEDED(rv)) {
+    // Calling generate credentials async, results will be dispatched to the
+    // main thread by calling OnCredsGenerated method
+    return NS_ERROR_IN_PROGRESS;
+  }
+
+  uint32_t generateFlags;
+  rv = auth->GenerateCredentials(
+      mAuthChannel, challenge, proxyAuth, ident.Domain(), ident.User(),
+      ident.Password(), &ss, &*continuationState, &generateFlags, result);
+
+  sessionState.swap(ss);
+  if (NS_FAILED(rv)) return rv;
+
+    // don't log this in release build since it could contain sensitive info.
+#ifdef DEBUG
+  LOG(("generated creds: %s\n", result.BeginReading()));
+#endif
+
+  return UpdateCache(auth, scheme, host, port, directory, realm, challenge,
+                     ident, result, generateFlags, sessionState, proxyAuth);
+}
+
+nsresult nsHttpChannelAuthProvider::UpdateCache(
+    nsIHttpAuthenticator* auth, const nsACString& scheme,
+    const nsACString& host, int32_t port, const nsACString& directory,
+    const nsACString& realm, const nsACString& challenge,
+    const nsHttpAuthIdentity& ident, const nsACString& creds,
+    uint32_t generateFlags, nsISupports* sessionState, bool aProxyAuth) {
+  nsresult rv;
+
+  uint32_t authFlags;
+  rv = auth->GetAuthFlags(&authFlags);
+  if (NS_FAILED(rv)) return rv;
+
+  // find out if this authenticator allows reuse of credentials and/or
+  // challenge.
+  bool saveCreds =
+      0 != (authFlags & nsIHttpAuthenticator::REUSABLE_CREDENTIALS);
+  bool saveChallenge =
+      0 != (authFlags & nsIHttpAuthenticator::REUSABLE_CHALLENGE);
+
+  bool saveIdentity =
+      0 == (generateFlags & nsIHttpAuthenticator::USING_INTERNAL_IDENTITY);
+
+  // this getter never fails
+  nsHttpAuthCache* authCache = gHttpHandler->AuthCache(mIsPrivate);
+
+  nsAutoCString suffix;
+  if (!aProxyAuth) {
+    // We don't isolate proxy credentials cache entries with the origin suffix
+    // as it would only annoy users with authentication dialogs popping up.
+    nsCOMPtr<nsIChannel> chan = do_QueryInterface(mAuthChannel);
+    GetOriginAttributesSuffix(chan, suffix);
+  }
+
+  // create a cache entry.  we do this even though we don't yet know that
+  // these credentials are valid b/c we need to avoid prompting the user
+  // more than once in case the credentials are valid.
+  //
+  // if the credentials are not reusable, then we don't bother sticking
+  // them in the auth cache.
+  rv = authCache->SetAuthEntry(scheme, host, port, directory, realm,
+                               saveCreds ? creds : ""_ns,
+                               saveChallenge ? challenge : ""_ns, suffix,
+                               saveIdentity ? &ident : nullptr, sessionState);
+  return rv;
+}
+
+NS_IMETHODIMP nsHttpChannelAuthProvider::ClearProxyIdent() {
+  LOG(("nsHttpChannelAuthProvider::ClearProxyIdent [this=%p]\n", this));
+
+  mProxyIdent.Clear();
+  return NS_OK;
+}
+
+nsresult nsHttpChannelAuthProvider::PrepareForAuthentication(bool proxyAuth) {
+  LOG(
+      ("nsHttpChannelAuthProvider::PrepareForAuthentication "
+       "[this=%p channel=%p]\n",
+       this, mAuthChannel));
+
+  if (!proxyAuth) {
+    // reset the current proxy continuation state because our last
+    // authentication attempt was completed successfully.
+    NS_IF_RELEASE(mProxyAuthContinuationState);
+    LOG(("  proxy continuation state has been reset"));
+  }
+
+  if (!UsingHttpProxy() || mProxyAuthType.IsEmpty()) return NS_OK;
+
+  // We need to remove any Proxy_Authorization header left over from a
+  // non-request based authentication handshake (e.g., for NTLM auth).
+
+  nsresult rv;
+  nsCOMPtr<nsIHttpAuthenticator> precedingAuth;
+  nsCString proxyAuthType;
+  rv = GetAuthenticator(mProxyAuthType, proxyAuthType,
+                        getter_AddRefs(precedingAuth));
+  if (NS_FAILED(rv)) return rv;
+
+  uint32_t precedingAuthFlags;
+  rv = precedingAuth->GetAuthFlags(&precedingAuthFlags);
+  if (NS_FAILED(rv)) return rv;
+
+  if (!(precedingAuthFlags & nsIHttpAuthenticator::REQUEST_BASED)) {
+    nsAutoCString challenges;
+    rv = mAuthChannel->GetProxyChallenges(challenges);
+    if (NS_FAILED(rv)) {
+      // delete the proxy authorization header because we weren't
+      // asked to authenticate
+      rv = mAuthChannel->SetProxyCredentials(""_ns);
+      if (NS_FAILED(rv)) return rv;
+      LOG(("  cleared proxy authorization header"));
+    }
+  }
+
+  return NS_OK;
+}
+
+class MOZ_STACK_CLASS ChallengeParser final : Tokenizer {
+ public:
+  explicit ChallengeParser(const nsACString& aChallenges)
+      : Tokenizer(aChallenges, nullptr, "") {
+    Record();
+  }
+
+  Maybe<nsDependentCSubstring> GetNext() {
+    Token t;
+    nsDependentCSubstring result;
+
+    bool inQuote = false;
+
+    while (Next(t)) {
+      if (t.Type() == TOKEN_EOL) {
+        Claim(result, ClaimInclusion::EXCLUDE_LAST);
+        SkipWhites(WhiteSkipping::INCLUDE_NEW_LINE);
+        Record();
+        inQuote = false;
+        if (!result.IsEmpty()) {
+          return Some(result);
+        }
+      } else if (t.Equals(Token::Char(',')) && !inQuote) {
+        // Sometimes we get multiple challenges separated by a comma.
+        // This is not great, as it's slightly ambiguous. We check if something
+        // is a new challenge by matching agains <param_name> =
+        // If the , isn't followed by a word and = then most likely
+        // it is the name of an authType.
+
+        const char* prevCursorPos = mCursor;
+        const char* prevRollbackPos = mRollback;
+
+        auto hasWordAndEqual = [&]() {
+          SkipWhites();
+          nsDependentCSubstring word;
+          if (!ReadWord(word)) {
+            return false;
+          }
+          SkipWhites();
+          return Check(Token::Char('='));
+        };
+        if (!hasWordAndEqual()) {
+          // This is not a parameter. It means the `,` character starts a
+          // different challenge.
+          // We'll revert the cursor and return the contents so far.
+          mCursor = prevCursorPos;
+          mRollback = prevRollbackPos;
+          Claim(result, ClaimInclusion::EXCLUDE_LAST);
+          SkipWhites();
+          Record();
+          if (!result.IsEmpty()) {
+            return Some(result);
+          }
+        }
+      } else if (t.Equals(Token::Char('"'))) {
+        inQuote = !inQuote;
+      }
+    }
+
+    Claim(result, Tokenizer::ClaimInclusion::INCLUDE_LAST);
+    SkipWhites();
+    Record();
+    if (!result.IsEmpty()) {
+      return Some(result);
+    }
+    return Nothing{};
+  }
+};
+
+enum ChallengeRank {
+  Unknown = 0,
+  Basic = 1,
+  Digest = 2,
+  NTLM = 3,
+  Negotiate = 4,
+};
+
+ChallengeRank Rank(const nsACString& aChallenge) {
+  if (StringBeginsWith(aChallenge, "Negotiate"_ns,
+                       nsCaseInsensitiveCStringComparator)) {
+    return ChallengeRank::Negotiate;
+  }
+
+  if (StringBeginsWith(aChallenge, "NTLM"_ns,
+                       nsCaseInsensitiveCStringComparator)) {
+    return ChallengeRank::NTLM;
+  }
+
+  if (StringBeginsWith(aChallenge, "Digest"_ns,
+                       nsCaseInsensitiveCStringComparator)) {
+    return ChallengeRank::Digest;
+  }
+
+  if (StringBeginsWith(aChallenge, "Basic"_ns,
+                       nsCaseInsensitiveCStringComparator)) {
+    return ChallengeRank::Basic;
+  }
+
+  return ChallengeRank::Unknown;
+}
+
+nsresult nsHttpChannelAuthProvider::GetCredentials(
+    const nsACString& aChallenges, bool proxyAuth, nsCString& creds) {
+  LOG(("nsHttpChannelAuthProvider::GetCredentials"));
+  nsAutoCString challenges(aChallenges);
+
+  using AuthChallenge = struct AuthChallenge {
+    nsDependentCSubstring challenge;
+    uint16_t algorithm = 0;
+    ChallengeRank rank = ChallengeRank::Unknown;
+
+    void operator=(const AuthChallenge& aOther) {
+      challenge.Rebind(aOther.challenge, 0);
+      algorithm = aOther.algorithm;
+      rank = aOther.rank;
+    }
+  };
+
+  nsTArray<AuthChallenge> cc;
+
+  ChallengeParser p(challenges);
+  while (true) {
+    auto next = p.GetNext();
+    if (next.isNothing()) {
+      break;
+    }
+    AuthChallenge ac{next.ref(), 0};
+    nsAutoCString realm, domain, nonce, opaque;
+    bool stale = false;
+    uint16_t qop = 0;
+    ac.rank = Rank(ac.challenge);
+    if (StringBeginsWith(ac.challenge, "Digest"_ns,
+                         nsCaseInsensitiveCStringComparator)) {
+      Unused << nsHttpDigestAuth::ParseChallenge(ac.challenge, realm, domain,
+                                                 nonce, opaque, &stale,
+                                                 &ac.algorithm, &qop);
+    }
+    cc.AppendElement(ac);
+  }
+
+  cc.StableSort([](const AuthChallenge& lhs, const AuthChallenge& rhs) {
+    if (StaticPrefs::network_auth_choose_most_secure_challenge()) {
+      // Different auth types
+      if (lhs.rank != rhs.rank) {
+        return lhs.rank < rhs.rank ? 1 : -1;
+      }
+
+      // If they're the same auth type, and not a Digest, then we treat them
+      // as equal (don't reorder them).
+      if (lhs.rank != ChallengeRank::Digest) {
+        return 0;
+      }
+    } else {
+      // Non-digest challenges should not be reordered when the pref is off.
+      if (lhs.algorithm == 0 || rhs.algorithm == 0) {
+        return 0;
+      }
+    }
+
+    // Same algorithm.
+    if (lhs.algorithm == rhs.algorithm) {
+      return 0;
+    }
+    return lhs.algorithm < rhs.algorithm ? 1 : -1;
+  });
+
+  nsCOMPtr<nsIHttpAuthenticator> auth;
+  nsCString authType;  // force heap allocation to enable string sharing since
+                       // we'll be assigning this value into mAuthType.
+
+  // set informations that depend on whether we're authenticating against a
+  // proxy or a webserver
+  nsISupports** currentContinuationState;
+  nsCString* currentAuthType;
+
+  if (proxyAuth) {
+    currentContinuationState = &mProxyAuthContinuationState;
+    currentAuthType = &mProxyAuthType;
+  } else {
+    currentContinuationState = &mAuthContinuationState;
+    currentAuthType = &mAuthType;
+  }
+
+  nsresult rv = NS_ERROR_NOT_AVAILABLE;
+  bool gotCreds = false;
+
+  // figure out which challenge we can handle and which authenticator to use.
+  for (size_t i = 0; i < cc.Length(); i++) {
+    rv = GetAuthenticator(cc[i].challenge, authType, getter_AddRefs(auth));
+    LOG(("trying auth for %s", authType.get()));
+    if (NS_SUCCEEDED(rv)) {
+      //
+      // if we've already selected an auth type from a previous challenge
+      // received while processing this channel, then skip others until
+      // we find a challenge corresponding to the previously tried auth
+      // type.
+      //
+      if (!currentAuthType->IsEmpty() && authType != *currentAuthType) continue;
+
+      //
+      // we allow the routines to run all the way through before we
+      // decide if they are valid.
+      //
+      // we don't worry about the auth cache being altered because that
+      // would have been the last step, and if the error is from updating
+      // the authcache it wasn't really altered anyway. -CTN
+      //
+      // at this point the code is really only useful for client side
+      // errors (it will not automatically fail over to do a different
+      // auth type if the server keeps rejecting what is being sent, even
+      // if a particular auth method only knows 1 thing, like a
+      // non-identity based authentication method)
+      //
+      rv = GetCredentialsForChallenge(cc[i].challenge, authType, proxyAuth,
+                                      auth, creds);
+      if (NS_SUCCEEDED(rv)) {
+        gotCreds = true;
+        *currentAuthType = authType;
+
+        break;
+      }
+      if (rv == NS_ERROR_IN_PROGRESS) {
+        // authentication prompt has been invoked and result is
+        // expected asynchronously, save current challenge being
+        // processed and all remaining challenges to use later in
+        // OnAuthAvailable and now immediately return
+        mCurrentChallenge = cc[i].challenge;
+        // imperfect; does not save server-side preference ordering.
+        // instead, continues with remaining string as provided by client
+        mRemainingChallenges.Truncate();
+        while (i + 1 < cc.Length()) {
+          i++;
+          mRemainingChallenges.Append(cc[i].challenge);
+          mRemainingChallenges.Append("\n"_ns);
+        }
+        return rv;
+      }
+
+      // reset the auth type and continuation state
+      NS_IF_RELEASE(*currentContinuationState);
+      currentAuthType->Truncate();
+    }
+  }
+
+  if (!gotCreds && !currentAuthType->IsEmpty()) {
+    // looks like we never found the auth type we were looking for.
+    // reset the auth type and continuation state, and try again.
+    currentAuthType->Truncate();
+    NS_IF_RELEASE(*currentContinuationState);
+
+    rv = GetCredentials(challenges, proxyAuth, creds);
+  }
+
+  return rv;
+}
+
+nsresult nsHttpChannelAuthProvider::GetAuthorizationMembers(
+    bool proxyAuth, nsACString& scheme, nsCString& host, int32_t& port,
+    nsACString& path, nsHttpAuthIdentity*& ident,
+    nsISupports**& continuationState) {
+  if (proxyAuth) {
+    MOZ_ASSERT(UsingHttpProxy(),
+               "proxyAuth is true, but no HTTP proxy is configured!");
+
+    host = ProxyHost();
+    port = ProxyPort();
+    ident = &mProxyIdent;
+    scheme.AssignLiteral("http");
+
+    continuationState = &mProxyAuthContinuationState;
+  } else {
+    host = Host();
+    port = Port();
+    ident = &mIdent;
+
+    nsresult rv;
+    rv = GetCurrentPath(path);
+    if (NS_FAILED(rv)) return rv;
+
+    rv = mURI->GetScheme(scheme);
+    if (NS_FAILED(rv)) return rv;
+
+    continuationState = &mAuthContinuationState;
+  }
+
+  return NS_OK;
+}
+
+nsresult nsHttpChannelAuthProvider::GetCredentialsForChallenge(
+    const nsACString& aChallenge, const nsACString& aAuthType, bool proxyAuth,
+    nsIHttpAuthenticator* auth, nsCString& creds) {
+  LOG(
+      ("nsHttpChannelAuthProvider::GetCredentialsForChallenge "
+       "[this=%p channel=%p proxyAuth=%d challenges=%s]\n",
+       this, mAuthChannel, proxyAuth, nsCString(aChallenge).get()));
+
+  // this getter never fails
+  nsHttpAuthCache* authCache = gHttpHandler->AuthCache(mIsPrivate);
+
+  uint32_t authFlags;
+  nsresult rv = auth->GetAuthFlags(&authFlags);
+  if (NS_FAILED(rv)) return rv;
+
+  nsAutoCString realm;
+  ParseRealm(aChallenge, realm);
+
+  // if no realm, then use the auth type as the realm.  ToUpperCase so the
+  // ficticious realm stands out a bit more.
+  // XXX this will cause some single signon misses!
+  // XXX this was meant to be used with NTLM, which supplies no realm.
+  /*
+  if (realm.IsEmpty()) {
+      realm = authType;
+      ToUpperCase(realm);
+  }
+  */
+
+  // set informations that depend on whether
+  // we're authenticating against a proxy
+  // or a webserver
+  nsAutoCString host;
+  int32_t port;
+  nsHttpAuthIdentity* ident;
+  nsAutoCString path, scheme;
+  bool identFromURI = false;
+  nsISupports** continuationState;
+
+  rv = GetAuthorizationMembers(proxyAuth, scheme, host, port, path, ident,
+                               continuationState);
+  if (NS_FAILED(rv)) return rv;
+
+  uint32_t loadFlags;
+  rv = mAuthChannel->GetLoadFlags(&loadFlags);
+  if (NS_FAILED(rv)) return rv;
+
+  // Fill only for non-proxy auth, proxy credentials are not OA-isolated.
+  nsAutoCString suffix;
+
+  if (!proxyAuth) {
+    nsCOMPtr<nsIChannel> chan = do_QueryInterface(mAuthChannel);
+    GetOriginAttributesSuffix(chan, suffix);
+
+    // if this is the first challenge, then try using the identity
+    // specified in the URL.
+    if (mIdent.IsEmpty()) {
+      GetIdentityFromURI(authFlags, mIdent);
+      identFromURI = !mIdent.IsEmpty();
+    }
+
+    if ((loadFlags & nsIRequest::LOAD_ANONYMOUS) && !identFromURI) {
+      LOG(("Skipping authentication for anonymous non-proxy request\n"));
+      return NS_ERROR_NOT_AVAILABLE;
+    }
+
+    // Let explicit URL credentials pass
+    // regardless of the LOAD_ANONYMOUS flag
+  } else if ((loadFlags & nsIRequest::LOAD_ANONYMOUS) && !UsingHttpProxy()) {
+    LOG(("Skipping authentication for anonymous non-proxy request\n"));
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  //
+  // if we already tried some credentials for this transaction, then
+  // we need to possibly clear them from the cache, unless the credentials
+  // in the cache have changed, in which case we'd want to give them a
+  // try instead.
+  //
+  nsHttpAuthEntry* entry = nullptr;
+  Unused << authCache->GetAuthEntryForDomain(scheme, host, port, realm, suffix,
+                                             &entry);
+
+  // hold reference to the auth session state (in case we clear our
+  // reference to the entry).
+  nsCOMPtr<nsISupports> sessionStateGrip;
+  if (entry) sessionStateGrip = entry->mMetaData;
+
+  // remember if we already had the continuation state.  it means we are in
+  // the middle of the authentication exchange and the connection must be
+  // kept sticky then (and only then).
+  bool authAtProgress = !!*continuationState;
+
+  // for digest auth, maybe our cached nonce value simply timed out...
+  bool identityInvalid;
+  nsISupports* sessionState = sessionStateGrip;
+  rv = auth->ChallengeReceived(mAuthChannel, aChallenge, proxyAuth,
+                               &sessionState, &*continuationState,
+                               &identityInvalid);
+  sessionStateGrip.swap(sessionState);
+  if (NS_FAILED(rv)) return rv;
+
+  LOG(("  identity invalid = %d\n", identityInvalid));
+
+  if (mConnectionBased && identityInvalid) {
+    // If the flag is set and identity is invalid, it means we received the
+    // first challange for a new negotiation round after negotiating a
+    // connection based auth failed (invalid password). The mConnectionBased
+    // flag is set later for the newly received challenge, so here it reflects
+    // the previous 401/7 response schema.
+    rv = mAuthChannel->CloseStickyConnection();
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+    if (!proxyAuth) {
+      // We must clear proxy ident in the following scenario + explanation:
+      // - we are authenticating to an NTLM proxy and an NTLM server
+      // - we successfully authenticated to the proxy, mProxyIdent keeps
+      //   the user name/domain and password, the identity has also been cached
+      // - we just threw away the connection because we are now asking for
+      //   creds for the server (WWW auth)
+      // - hence, we will have to auth to the proxy again as well
+      // - if we didn't clear the proxy identity, it would be considered
+      //   as non-valid and we would ask the user again ; clearing it forces
+      //   use of the cached identity and not asking the user again
+      ClearProxyIdent();
+    }
+  }
+
+  mConnectionBased = !!(authFlags & nsIHttpAuthenticator::CONNECTION_BASED);
+
+  // It's legal if the peer closes the connection after the first 401/7.
+  // Making the connection sticky will prevent its restart giving the user
+  // a 'network reset' error every time.  Hence, we mark the connection
+  // as restartable.
+  mAuthChannel->ConnectionRestartable(!authAtProgress);
+
+  if (identityInvalid) {
+    if (entry) {
+      if (ident->Equals(entry->Identity())) {
+        if (!identFromURI) {
+          LOG(("  clearing bad auth cache entry\n"));
+          // ok, we've already tried this user identity, so clear the
+          // corresponding entry from the auth cache.
+          authCache->ClearAuthEntry(scheme, host, port, realm, suffix);
+          entry = nullptr;
+          ident->Clear();
+        }
+      } else if (!identFromURI ||
+                 (ident->User() == entry->Identity().User() &&
+                  !(loadFlags & (nsIChannel::LOAD_ANONYMOUS |
+                                 nsIChannel::LOAD_EXPLICIT_CREDENTIALS)))) {
+        LOG(("  taking identity from auth cache\n"));
+        // the password from the auth cache is more likely to be
+        // correct than the one in the URL.  at least, we know that it
+        // works with the given username.  it is possible for a server
+        // to distinguish logons based on the supplied password alone,
+        // but that would be quite unusual... and i don't think we need
+        // to worry about such unorthodox cases.
+        *ident = entry->Identity();
+        identFromURI = false;
+        if (entry->Creds()[0] != '\0') {
+          LOG(("    using cached credentials!\n"));
+          creds.Assign(entry->Creds());
+          return entry->AddPath(path);
+        }
+      }
+    } else if (!identFromURI) {
+      // hmm... identity invalid, but no auth entry!  the realm probably
+      // changed (see bug 201986).
+      ident->Clear();
+    }
+
+    if (!entry && ident->IsEmpty()) {
+      uint32_t level = nsIAuthPrompt2::LEVEL_NONE;
+      if ((!proxyAuth && mUsingSSL) || (proxyAuth && mProxyUsingSSL)) {
+        level = nsIAuthPrompt2::LEVEL_SECURE;
+      } else if (authFlags & nsIHttpAuthenticator::IDENTITY_ENCRYPTED) {
+        level = nsIAuthPrompt2::LEVEL_PW_ENCRYPTED;
+      }
+
+      // Collect statistics on how frequently the various types of HTTP
+      // authentication are used over SSL and non-SSL connections.
+      if (Telemetry::CanRecordPrereleaseData()) {
+        if ("basic"_ns.Equals(aAuthType, nsCaseInsensitiveCStringComparator)) {
+          Telemetry::Accumulate(
+              Telemetry::HTTP_AUTH_TYPE_STATS,
+              UsingSSL() ? HTTP_AUTH_BASIC_SECURE : HTTP_AUTH_BASIC_INSECURE);
+        } else if ("digest"_ns.Equals(aAuthType,
+                                      nsCaseInsensitiveCStringComparator)) {
+          Telemetry::Accumulate(
+              Telemetry::HTTP_AUTH_TYPE_STATS,
+              UsingSSL() ? HTTP_AUTH_DIGEST_SECURE : HTTP_AUTH_DIGEST_INSECURE);
+        } else if ("ntlm"_ns.Equals(aAuthType,
+                                    nsCaseInsensitiveCStringComparator)) {
+          Telemetry::Accumulate(
+              Telemetry::HTTP_AUTH_TYPE_STATS,
+              UsingSSL() ? HTTP_AUTH_NTLM_SECURE : HTTP_AUTH_NTLM_INSECURE);
+        } else if ("negotiate"_ns.Equals(aAuthType,
+                                         nsCaseInsensitiveCStringComparator)) {
+          Telemetry::Accumulate(Telemetry::HTTP_AUTH_TYPE_STATS,
+                                UsingSSL() ? HTTP_AUTH_NEGOTIATE_SECURE
+                                           : HTTP_AUTH_NEGOTIATE_INSECURE);
+        }
+      }
+
+      // Depending on the pref setting, the authentication dialog may be
+      // blocked for all sub-resources, blocked for cross-origin
+      // sub-resources, or always allowed for sub-resources.
+      // For more details look at the bug 647010.
+      // BlockPrompt will set mCrossOrigin parameter as well.
+      if (BlockPrompt(proxyAuth)) {
+        LOG((
+            "nsHttpChannelAuthProvider::GetCredentialsForChallenge: "
+            "Prompt is blocked [this=%p pref=%d img-pref=%d "
+            "non-web-content-triggered-pref=%d]\n",
+            this, StaticPrefs::network_auth_subresource_http_auth_allow(),
+            StaticPrefs::
+                network_auth_subresource_img_cross_origin_http_auth_allow(),
+            StaticPrefs::
+                network_auth_non_web_content_triggered_resources_http_auth_allow()));
+        return NS_ERROR_ABORT;
+      }
+
+      // at this point we are forced to interact with the user to get
+      // their username and password for this domain.
+      rv = PromptForIdentity(level, proxyAuth, realm, aAuthType, authFlags,
+                             *ident);
+      if (NS_FAILED(rv)) return rv;
+      identFromURI = false;
+    }
+  }
+
+  if (identFromURI) {
+    // Warn the user before automatically using the identity from the URL
+    // to automatically log them into a site (see bug 232567).
+    if (!ConfirmAuth("AutomaticAuth", false)) {
+      // calling cancel here sets our mStatus and aborts the HTTP
+      // transaction, which prevents OnDataAvailable events.
+      rv = mAuthChannel->Cancel(NS_ERROR_ABORT);
+      MOZ_ASSERT(NS_SUCCEEDED(rv));
+      // this return code alone is not equivalent to Cancel, since
+      // it only instructs our caller that authentication failed.
+      // without an explicit call to Cancel, our caller would just
+      // load the page that accompanies the HTTP auth challenge.
+      return NS_ERROR_ABORT;
+    }
+  }
+
+  //
+  // get credentials for the given user:pass
+  //
+  // always store the credentials we're trying now so that they will be used
+  // on subsequent links.  This will potentially remove good credentials from
+  // the cache.  This is ok as we don't want to use cached credentials if the
+  // user specified something on the URI or in another manner.  This is so
+  // that we don't transparently authenticate as someone they're not
+  // expecting to authenticate as.
+  //
+  nsCString result;
+  rv = GenCredsAndSetEntry(auth, proxyAuth, scheme, host, port, path, realm,
+                           aChallenge, *ident, sessionStateGrip, creds);
+  return rv;
+}
+
+bool nsHttpChannelAuthProvider::BlockPrompt(bool proxyAuth) {
+  // Verify that it's ok to prompt for credentials here, per spec
+  // http://xhr.spec.whatwg.org/#the-send%28%29-method
+
+  nsCOMPtr<nsIHttpChannelInternal> chanInternal =
+      do_QueryInterface(mAuthChannel);
+  MOZ_ASSERT(chanInternal);
+
+  if (chanInternal->GetBlockAuthPrompt()) {
+    LOG(
+        ("nsHttpChannelAuthProvider::BlockPrompt: Prompt is blocked "
+         "[this=%p channel=%p]\n",
+         this, mAuthChannel));
+    return true;
+  }
+
+  if (proxyAuth) {
+    // Do not block auth-dialog if this is a proxy authentication.
+    return false;
+  }
+
+  nsCOMPtr<nsIChannel> chan = do_QueryInterface(mAuthChannel);
+  nsCOMPtr<nsILoadInfo> loadInfo = chan->LoadInfo();
+
+  // We will treat loads w/o loadInfo as a top level document.
+  bool topDoc = true;
+  bool xhr = false;
+  bool nonWebContent = false;
+
+  if (loadInfo->GetExternalContentPolicyType() !=
+      ExtContentPolicy::TYPE_DOCUMENT) {
+    topDoc = false;
+  }
+
+  if (!topDoc) {
+    nsCOMPtr<nsIPrincipal> triggeringPrinc = loadInfo->TriggeringPrincipal();
+    if (triggeringPrinc->IsSystemPrincipal()) {
+      nonWebContent = true;
+    }
+  }
+
+  if (loadInfo->GetExternalContentPolicyType() ==
+      ExtContentPolicy::TYPE_XMLHTTPREQUEST) {
+    xhr = true;
+  }
+
+  if (!topDoc && !xhr) {
+    nsCOMPtr<nsIURI> topURI;
+    Unused << chanInternal->GetTopWindowURI(getter_AddRefs(topURI));
+    if (topURI) {
+      mCrossOrigin = !NS_SecurityCompareURIs(topURI, mURI, true);
+    } else {
+      nsIPrincipal* loadingPrinc = loadInfo->GetLoadingPrincipal();
+      MOZ_ASSERT(loadingPrinc);
+      mCrossOrigin = !loadingPrinc->IsSameOrigin(mURI);
+    }
+  }
+
+  if (Telemetry::CanRecordPrereleaseData()) {
+    if (topDoc) {
+      Telemetry::Accumulate(Telemetry::HTTP_AUTH_DIALOG_STATS_3,
+                            HTTP_AUTH_DIALOG_TOP_LEVEL_DOC);
+    } else if (nonWebContent) {
+      Telemetry::Accumulate(Telemetry::HTTP_AUTH_DIALOG_STATS_3,
+                            HTTP_AUTH_DIALOG_NON_WEB_CONTENT);
+    } else if (!mCrossOrigin) {
+      if (xhr) {
+        Telemetry::Accumulate(Telemetry::HTTP_AUTH_DIALOG_STATS_3,
+                              HTTP_AUTH_DIALOG_SAME_ORIGIN_XHR);
+      } else {
+        Telemetry::Accumulate(Telemetry::HTTP_AUTH_DIALOG_STATS_3,
+                              HTTP_AUTH_DIALOG_SAME_ORIGIN_SUBRESOURCE);
+      }
+    } else {
+      Telemetry::Accumulate(
+          Telemetry::HTTP_AUTH_DIALOG_STATS_3,
+          static_cast<uint32_t>(loadInfo->GetExternalContentPolicyType()));
+    }
+  }
+
+  if (!topDoc &&
+      !StaticPrefs::
+          network_auth_non_web_content_triggered_resources_http_auth_allow() &&
+      nonWebContent) {
+    return true;
+  }
+
+  switch (StaticPrefs::network_auth_subresource_http_auth_allow()) {
+    case SUBRESOURCE_AUTH_DIALOG_DISALLOW_ALL:
+      // Do not open the http-authentication credentials dialog for
+      // the sub-resources.
+      return !topDoc && !xhr;
+    case SUBRESOURCE_AUTH_DIALOG_DISALLOW_CROSS_ORIGIN:
+      // Open the http-authentication credentials dialog for
+      // the sub-resources only if they are not cross-origin.
+      return !topDoc && !xhr && mCrossOrigin;
+    case SUBRESOURCE_AUTH_DIALOG_ALLOW_ALL:
+      // Allow the http-authentication dialog for subresources.
+      // If pref network.auth.subresource-img-cross-origin-http-auth-allow
+      // is set, http-authentication dialog for image subresources is
+      // blocked.
+      if (mCrossOrigin &&
+          !StaticPrefs::
+              network_auth_subresource_img_cross_origin_http_auth_allow() &&
+          loadInfo &&
+          ((loadInfo->GetExternalContentPolicyType() ==
+            ExtContentPolicy::TYPE_IMAGE) ||
+           (loadInfo->GetExternalContentPolicyType() ==
+            ExtContentPolicy::TYPE_IMAGESET))) {
+        return true;
+      }
+      return false;
+    default:
+      // This is an invalid value.
+      MOZ_ASSERT(false, "A non valid value!");
+  }
+  return false;
+}
+
+inline void GetAuthType(const nsACString& aChallenge, nsCString& authType) {
+  auto spaceIndex = aChallenge.FindChar(' ');
+  authType = Substring(aChallenge, 0, spaceIndex);
+  // normalize to lowercase
+  ToLowerCase(authType);
+}
+
+nsresult nsHttpChannelAuthProvider::GetAuthenticator(
+    const nsACString& aChallenge, nsCString& authType,
+    nsIHttpAuthenticator** auth) {
+  LOG(("nsHttpChannelAuthProvider::GetAuthenticator [this=%p channel=%p]\n",
+       this, mAuthChannel));
+
+  GetAuthType(aChallenge, authType);
+
+  nsCOMPtr<nsIHttpAuthenticator> authenticator;
+#ifdef MOZ_AUTH_EXTENSION
+  if (authType.EqualsLiteral("negotiate")) {
+    authenticator = nsHttpNegotiateAuth::GetOrCreate();
+  } else
+#endif
+      if (authType.EqualsLiteral("basic")) {
+    authenticator = nsHttpBasicAuth::GetOrCreate();
+  } else if (authType.EqualsLiteral("digest")) {
+    authenticator = nsHttpDigestAuth::GetOrCreate();
+  } else if (authType.EqualsLiteral("ntlm")) {
+    authenticator = nsHttpNTLMAuth::GetOrCreate();
+  } else if (authType.EqualsLiteral("mock_auth") &&
+             PR_GetEnv("XPCSHELL_TEST_PROFILE_DIR")) {
+    authenticator = MockHttpAuth::Create();
+  } else {
+    return NS_ERROR_FACTORY_NOT_REGISTERED;
+  }
+
+  if (!authenticator) {
+    // If called during shutdown it's possible that the singleton authenticator
+    // was already cleared so we have a null one here.
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  MOZ_ASSERT(authenticator);
+  authenticator.forget(auth);
+
+  return NS_OK;
+}
+
+// buf contains "domain\user"
+static void ParseUserDomain(const nsAString& buf, nsDependentSubstring& user,
+                            nsDependentSubstring& domain) {
+  auto backslashPos = buf.FindChar(u'\\');
+  if (backslashPos != kNotFound) {
+    domain.Rebind(buf, 0, backslashPos);
+    user.Rebind(buf, backslashPos + 1);
+  }
+}
+
+void nsHttpChannelAuthProvider::GetIdentityFromURI(uint32_t authFlags,
+                                                   nsHttpAuthIdentity& ident) {
+  LOG(("nsHttpChannelAuthProvider::GetIdentityFromURI [this=%p channel=%p]\n",
+       this, mAuthChannel));
+
+  bool hasUserPass;
+  if (NS_FAILED(mURI->GetHasUserPass(&hasUserPass)) || !hasUserPass) {
+    return;
+  }
+
+  nsAutoString userBuf;
+  nsAutoString passBuf;
+
+  // XXX i18n
+  nsAutoCString buf;
+  nsresult rv = mURI->GetUsername(buf);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+  NS_UnescapeURL(buf);
+  CopyUTF8toUTF16(buf, userBuf);
+
+  rv = mURI->GetPassword(buf);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+  NS_UnescapeURL(buf);
+  CopyUTF8toUTF16(buf, passBuf);
+
+  nsDependentSubstring user(userBuf, 0);
+  nsDependentSubstring domain(u""_ns, 0);
+
+  if (authFlags & nsIHttpAuthenticator::IDENTITY_INCLUDES_DOMAIN) {
+    ParseUserDomain(userBuf, user, domain);
+  }
+
+  ident = nsHttpAuthIdentity(domain, user, passBuf);
+}
+
+void nsHttpChannelAuthProvider::ParseRealm(const nsACString& aChallenge,
+                                           nsACString& realm) {
+  //
+  // From RFC2617 section 1.2, the realm value is defined as such:
+  //
+  //    realm       = "realm" "=" realm-value
+  //    realm-value = quoted-string
+  //
+  // but, we'll accept anything after the the "=" up to the first space, or
+  // end-of-line, if the string is not quoted.
+  //
+
+  Tokenizer t(aChallenge);
+
+  // The challenge begins with the authType.
+  // If we can't find that something has probably gone wrong.
+  t.SkipWhites();
+  nsDependentCSubstring authType;
+  if (!t.ReadWord(authType)) {
+    return;
+  }
+
+  // Will return true if the tokenizer advanced the cursor - false otherwise.
+  auto readParam = [&](nsDependentCSubstring& key, nsAutoCString& value) {
+    key.Rebind(EmptyCString(), 0);
+    value.Truncate();
+
+    t.SkipWhites();
+    if (!t.ReadWord(key)) {
+      return false;
+    }
+    t.SkipWhites();
+    if (!t.CheckChar('=')) {
+      return true;
+    }
+    t.SkipWhites();
+
+    Tokenizer::Token token1;
+
+    t.Record();
+    if (!t.Next(token1)) {
+      return true;
+    }
+    nsDependentCSubstring sub;
+    bool hasQuote = false;
+    if (token1.Equals(Tokenizer::Token::Char('"'))) {
+      hasQuote = true;
+    } else {
+      t.Claim(sub, Tokenizer::ClaimInclusion::INCLUDE_LAST);
+      value.Append(sub);
+    }
+    t.Record();
+    Tokenizer::Token token2;
+    while (t.Next(token2)) {
+      if (hasQuote && token2.Equals(Tokenizer::Token::Char('"')) &&
+          !token1.Equals(Tokenizer::Token::Char('\\'))) {
+        break;
+      }
+      if (!hasQuote && (token2.Type() == Tokenizer::TokenType::TOKEN_WS ||
+                        token2.Type() == Tokenizer::TokenType::TOKEN_EOL)) {
+        break;
+      }
+
+      t.Claim(sub, Tokenizer::ClaimInclusion::INCLUDE_LAST);
+      if (!sub.Equals(R"(\)")) {
+        value.Append(sub);
+      }
+      t.Record();
+      token1 = token2;
+    }
+    return true;
+  };
+
+  while (!t.CheckEOF()) {
+    nsDependentCSubstring key;
+    nsAutoCString value;
+    // If we couldn't read anything, and the input isn't followed by a ,
+    // then we exit.
+    if (!readParam(key, value) && !t.Check(Tokenizer::Token::Char(','))) {
+      break;
+    }
+    // When we find the first instance of realm we exit.
+    // Theoretically there should be only one instance and we should fail
+    // if there are more, but we're trying to preserve existing behaviour.
+    if (key.Equals("realm"_ns, nsCaseInsensitiveCStringComparator)) {
+      realm = value;
+      break;
+    }
+  }
+}
+
+class nsHTTPAuthInformation : public nsAuthInformationHolder {
+ public:
+  nsHTTPAuthInformation(uint32_t aFlags, const nsString& aRealm,
+                        const nsACString& aAuthType)
+      : nsAuthInformationHolder(aFlags, aRealm, aAuthType) {}
+
+  void SetToHttpAuthIdentity(uint32_t authFlags, nsHttpAuthIdentity& identity);
+};
+
+void nsHTTPAuthInformation::SetToHttpAuthIdentity(
+    uint32_t authFlags, nsHttpAuthIdentity& identity) {
+  identity = nsHttpAuthIdentity(Domain(), User(), Password());
+}
+
+nsresult nsHttpChannelAuthProvider::PromptForIdentity(
+    uint32_t level, bool proxyAuth, const nsACString& realm,
+    const nsACString& authType, uint32_t authFlags, nsHttpAuthIdentity& ident) {
+  LOG(("nsHttpChannelAuthProvider::PromptForIdentity [this=%p channel=%p]\n",
+       this, mAuthChannel));
+
+  nsresult rv;
+
+  nsCOMPtr<nsIInterfaceRequestor> callbacks;
+  rv = mAuthChannel->GetNotificationCallbacks(getter_AddRefs(callbacks));
+  if (NS_FAILED(rv)) return rv;
+
+  nsCOMPtr<nsILoadGroup> loadGroup;
+  rv = mAuthChannel->GetLoadGroup(getter_AddRefs(loadGroup));
+  if (NS_FAILED(rv)) return rv;
+
+  nsCOMPtr<nsIAuthPrompt2> authPrompt;
+  GetAuthPrompt(callbacks, proxyAuth, getter_AddRefs(authPrompt));
+  if (!authPrompt && loadGroup) {
+    nsCOMPtr<nsIInterfaceRequestor> cbs;
+    loadGroup->GetNotificationCallbacks(getter_AddRefs(cbs));
+    GetAuthPrompt(cbs, proxyAuth, getter_AddRefs(authPrompt));
+  }
+  if (!authPrompt) return NS_ERROR_NO_INTERFACE;
+
+  // XXX i18n: need to support non-ASCII realm strings (see bug 41489)
+  NS_ConvertASCIItoUTF16 realmU(realm);
+
+  // prompt the user...
+  uint32_t promptFlags = 0;
+  if (proxyAuth) {
+    promptFlags |= nsIAuthInformation::AUTH_PROXY;
+    if (mTriedProxyAuth) promptFlags |= nsIAuthInformation::PREVIOUS_FAILED;
+    mTriedProxyAuth = true;
+  } else {
+    promptFlags |= nsIAuthInformation::AUTH_HOST;
+    if (mTriedHostAuth) promptFlags |= nsIAuthInformation::PREVIOUS_FAILED;
+    mTriedHostAuth = true;
+  }
+
+  if (authFlags & nsIHttpAuthenticator::IDENTITY_INCLUDES_DOMAIN) {
+    promptFlags |= nsIAuthInformation::NEED_DOMAIN;
+  }
+
+  if (mCrossOrigin) {
+    promptFlags |= nsIAuthInformation::CROSS_ORIGIN_SUB_RESOURCE;
+  }
+
+  RefPtr<nsHTTPAuthInformation> holder =
+      new nsHTTPAuthInformation(promptFlags, realmU, authType);
+  if (!holder) return NS_ERROR_OUT_OF_MEMORY;
+
+  nsCOMPtr<nsIChannel> channel(do_QueryInterface(mAuthChannel, &rv));
+  if (NS_FAILED(rv)) return rv;
+
+  rv = authPrompt->AsyncPromptAuth(channel, this, nullptr, level, holder,
+                                   getter_AddRefs(mAsyncPromptAuthCancelable));
+
+  if (NS_SUCCEEDED(rv)) {
+    // indicate using this error code that authentication prompt
+    // result is expected asynchronously
+    rv = NS_ERROR_IN_PROGRESS;
+  } else {
+    // Fall back to synchronous prompt
+    bool retval = false;
+    rv = authPrompt->PromptAuth(channel, level, holder, &retval);
+    if (NS_FAILED(rv)) return rv;
+
+    if (!retval) {
+      rv = NS_ERROR_ABORT;
+    } else {
+      holder->SetToHttpAuthIdentity(authFlags, ident);
+    }
+  }
+
+  // remember that we successfully showed the user an auth dialog
+  if (!proxyAuth) mSuppressDefensiveAuth = true;
+
+  if (mConnectionBased) {
+    // Connection can be reset by the server in the meantime user is entering
+    // the credentials.  Result would be just a "Connection was reset" error.
+    // Hence, we drop the current regardless if the user would make it on time
+    // to provide credentials.
+    // It's OK to send the NTLM type 1 message (response to the plain "NTLM"
+    // challenge) on a new connection.
+    {
+      DebugOnly<nsresult> rv = mAuthChannel->CloseStickyConnection();
+      MOZ_ASSERT(NS_SUCCEEDED(rv));
+    }
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP nsHttpChannelAuthProvider::OnAuthAvailable(
+    nsISupports* aContext, nsIAuthInformation* aAuthInfo) {
+  LOG(("nsHttpChannelAuthProvider::OnAuthAvailable [this=%p channel=%p]", this,
+       mAuthChannel));
+
+  mAsyncPromptAuthCancelable = nullptr;
+  if (!mAuthChannel) return NS_OK;
+
+  nsresult rv;
+
+  nsAutoCString host;
+  int32_t port;
+  nsHttpAuthIdentity* ident;
+  nsAutoCString path, scheme;
+  nsISupports** continuationState;
+  rv = GetAuthorizationMembers(mProxyAuth, scheme, host, port, path, ident,
+                               continuationState);
+  if (NS_FAILED(rv)) OnAuthCancelled(aContext, false);
+
+  nsAutoCString realm;
+  ParseRealm(mCurrentChallenge, realm);
+
+  nsCOMPtr<nsIChannel> chan = do_QueryInterface(mAuthChannel);
+  nsAutoCString suffix;
+  if (!mProxyAuth) {
+    // Fill only for non-proxy auth, proxy credentials are not OA-isolated.
+    GetOriginAttributesSuffix(chan, suffix);
+  }
+
+  nsHttpAuthCache* authCache = gHttpHandler->AuthCache(mIsPrivate);
+  nsHttpAuthEntry* entry = nullptr;
+  Unused << authCache->GetAuthEntryForDomain(scheme, host, port, realm, suffix,
+                                             &entry);
+
+  nsCOMPtr<nsISupports> sessionStateGrip;
+  if (entry) sessionStateGrip = entry->mMetaData;
+
+  nsAuthInformationHolder* holder =
+      static_cast<nsAuthInformationHolder*>(aAuthInfo);
+  *ident =
+      nsHttpAuthIdentity(holder->Domain(), holder->User(), holder->Password());
+
+  nsAutoCString unused;
+  nsCOMPtr<nsIHttpAuthenticator> auth;
+  rv = GetAuthenticator(mCurrentChallenge, unused, getter_AddRefs(auth));
+  if (NS_FAILED(rv)) {
+    MOZ_ASSERT(false, "GetAuthenticator failed");
+    OnAuthCancelled(aContext, true);
+    return NS_OK;
+  }
+
+  nsCString creds;
+  rv = GenCredsAndSetEntry(auth, mProxyAuth, scheme, host, port, path, realm,
+                           mCurrentChallenge, *ident, sessionStateGrip, creds);
+
+  mCurrentChallenge.Truncate();
+  if (NS_FAILED(rv)) {
+    OnAuthCancelled(aContext, true);
+    return NS_OK;
+  }
+
+  return ContinueOnAuthAvailable(creds);
+}
+
+NS_IMETHODIMP nsHttpChannelAuthProvider::OnAuthCancelled(nsISupports* aContext,
+                                                         bool userCancel) {
+  LOG(("nsHttpChannelAuthProvider::OnAuthCancelled [this=%p channel=%p]", this,
+       mAuthChannel));
+
+  mAsyncPromptAuthCancelable = nullptr;
+  if (!mAuthChannel) return NS_OK;
+
+  // When user cancels or auth fails we want to close the connection for
+  // connection based schemes like NTLM.  Some servers don't like re-negotiation
+  // on the same connection.
+  nsresult rv;
+  if (mConnectionBased) {
+    rv = mAuthChannel->CloseStickyConnection();
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+    mConnectionBased = false;
+  }
+
+  nsCOMPtr<nsIChannel> channel = do_QueryInterface(mAuthChannel);
+  if (channel) {
+    nsresult status;
+    Unused << channel->GetStatus(&status);
+    if (NS_FAILED(status)) {
+      // If the channel is already cancelled, there is no need to deal with the
+      // rest challenges.
+      LOG(("  Clear mRemainingChallenges, since mAuthChannel is cancelled"));
+      mRemainingChallenges.Truncate();
+    }
+  }
+
+  if (userCancel) {
+    if (!mRemainingChallenges.IsEmpty()) {
+      // there are still some challenges to process, do so
+
+      // Get rid of current continuationState to avoid reusing it in
+      // next challenges since it is no longer relevant.
+      if (mProxyAuth) {
+        NS_IF_RELEASE(mProxyAuthContinuationState);
+      } else {
+        NS_IF_RELEASE(mAuthContinuationState);
+      }
+      nsAutoCString creds;
+      rv = GetCredentials(mRemainingChallenges, mProxyAuth, creds);
+      if (NS_SUCCEEDED(rv)) {
+        // GetCredentials loaded the credentials from the cache or
+        // some other way in a synchronous manner, process those
+        // credentials now
+        mRemainingChallenges.Truncate();
+        return ContinueOnAuthAvailable(creds);
+      }
+      if (rv == NS_ERROR_IN_PROGRESS) {
+        // GetCredentials successfully queued another authprompt for
+        // a challenge from the list, we are now waiting for the user
+        // to provide the credentials
+        return NS_OK;
+      }
+
+      // otherwise, we failed...
+    }
+
+    mRemainingChallenges.Truncate();
+  }
+
+  rv = mAuthChannel->OnAuthCancelled(userCancel);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsHttpChannelAuthProvider::OnCredsGenerated(
+    const nsACString& aGeneratedCreds, uint32_t aFlags, nsresult aResult,
+    nsISupports* aSessionState, nsISupports* aContinuationState) {
+  nsresult rv;
+
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // When channel is closed, do not proceed
+  if (!mAuthChannel) {
+    return NS_OK;
+  }
+
+  mGenerateCredentialsCancelable = nullptr;
+
+  if (NS_FAILED(aResult)) {
+    return OnAuthCancelled(nullptr, true);
+  }
+
+  // We want to update m(Proxy)AuthContinuationState in case it was changed by
+  // nsHttpNegotiateAuth::GenerateCredentials
+  nsCOMPtr<nsISupports> contState(aContinuationState);
+  if (mProxyAuth) {
+    contState.swap(mProxyAuthContinuationState);
+  } else {
+    contState.swap(mAuthContinuationState);
+  }
+
+  nsCOMPtr<nsIHttpAuthenticator> auth;
+  nsAutoCString unused;
+  rv = GetAuthenticator(mCurrentChallenge, unused, getter_AddRefs(auth));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoCString host;
+  int32_t port;
+  nsHttpAuthIdentity* ident;
+  nsAutoCString directory, scheme;
+  nsISupports** unusedContinuationState;
+
+  // Get realm from challenge
+  nsAutoCString realm;
+  ParseRealm(mCurrentChallenge, realm);
+
+  rv = GetAuthorizationMembers(mProxyAuth, scheme, host, port, directory, ident,
+                               unusedContinuationState);
+  if (NS_FAILED(rv)) return rv;
+
+  rv =
+      UpdateCache(auth, scheme, host, port, directory, realm, mCurrentChallenge,
+                  *ident, aGeneratedCreds, aFlags, aSessionState, mProxyAuth);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+  mCurrentChallenge.Truncate();
+
+  rv = ContinueOnAuthAvailable(aGeneratedCreds);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+  return NS_OK;
+}
+
+nsresult nsHttpChannelAuthProvider::ContinueOnAuthAvailable(
+    const nsACString& creds) {
+  nsresult rv;
+  if (mProxyAuth) {
+    rv = mAuthChannel->SetProxyCredentials(creds);
+  } else {
+    rv = mAuthChannel->SetWWWCredentials(creds);
+  }
+  if (NS_FAILED(rv)) return rv;
+
+  // drop our remaining list of challenges.  We don't need them, because we
+  // have now authenticated against a challenge and will be sending that
+  // information to the server (or proxy).  If it doesn't accept our
+  // authentication it'll respond with failure and resend the challenge list
+  mRemainingChallenges.Truncate();
+
+  Unused << mAuthChannel->OnAuthAvailable();
+
+  return NS_OK;
+}
+
+bool nsHttpChannelAuthProvider::ConfirmAuth(const char* bundleKey,
+                                            bool doYesNoPrompt) {
+  // skip prompting the user if
+  //   1) prompts are disabled by pref
+  //   2) we've already prompted the user
+  //   3) we're not a toplevel channel
+  //   4) the userpass length is less than the "phishy" threshold
+
+  if (!StaticPrefs::network_auth_confirmAuth_enabled()) {
+    return true;
+  }
+
+  uint32_t loadFlags;
+  nsresult rv = mAuthChannel->GetLoadFlags(&loadFlags);
+  if (NS_FAILED(rv)) return true;
+
+  if (mSuppressDefensiveAuth ||
+      !(loadFlags & nsIChannel::LOAD_INITIAL_DOCUMENT_URI)) {
+    return true;
+  }
+
+  nsAutoCString userPass;
+  rv = mURI->GetUserPass(userPass);
+  if (NS_FAILED(rv) ||
+      (userPass.Length() < gHttpHandler->PhishyUserPassLength())) {
+    return true;
+  }
+
+  // we try to confirm by prompting the user.  if we cannot do so, then
+  // assume the user said ok.  this is done to keep things working in
+  // embedded builds, where the string bundle might not be present, etc.
+
+  nsCOMPtr<nsIStringBundleService> bundleService =
+      do_GetService(NS_STRINGBUNDLE_CONTRACTID);
+  if (!bundleService) return true;
+
+  nsCOMPtr<nsIStringBundle> bundle;
+  bundleService->CreateBundle(NECKO_MSGS_URL, getter_AddRefs(bundle));
+  if (!bundle) return true;
+
+  nsAutoCString host;
+  rv = mURI->GetHost(host);
+  if (NS_FAILED(rv)) return true;
+
+  nsAutoCString user;
+  rv = mURI->GetUsername(user);
+  if (NS_FAILED(rv)) return true;
+
+  NS_ConvertUTF8toUTF16 ucsHost(host), ucsUser(user);
+
+  size_t userLength = ucsUser.Length();
+  if (userLength > MAX_DISPLAYED_USER_LENGTH) {
+    size_t desiredLength = MAX_DISPLAYED_USER_LENGTH;
+    // Don't cut off right before a low surrogate. Just include it.
+    if (NS_IS_LOW_SURROGATE(ucsUser[desiredLength])) {
+      desiredLength++;
+    }
+    ucsUser.Replace(desiredLength, userLength - desiredLength,
+                    nsContentUtils::GetLocalizedEllipsis());
+  }
+
+  size_t hostLen = ucsHost.Length();
+  if (hostLen > MAX_DISPLAYED_HOST_LENGTH) {
+    size_t cutPoint = hostLen - MAX_DISPLAYED_HOST_LENGTH;
+    // Likewise, don't cut off right before a low surrogate here.
+    // Keep the low surrogate
+    if (NS_IS_LOW_SURROGATE(ucsHost[cutPoint])) {
+      cutPoint--;
+    }
+    // It's possible cutPoint was 1 and is now 0. Only insert the ellipsis
+    // if we're actually removing anything.
+    if (cutPoint > 0) {
+      ucsHost.Replace(0, cutPoint, nsContentUtils::GetLocalizedEllipsis());
+    }
+  }
+
+  AutoTArray<nsString, 2> strs = {ucsHost, ucsUser};
+
+  nsAutoString msg;
+  rv = bundle->FormatStringFromName(bundleKey, strs, msg);
+  if (NS_FAILED(rv)) return true;
+
+  nsCOMPtr<nsIInterfaceRequestor> callbacks;
+  rv = mAuthChannel->GetNotificationCallbacks(getter_AddRefs(callbacks));
+  if (NS_FAILED(rv)) return true;
+
+  nsCOMPtr<nsILoadGroup> loadGroup;
+  rv = mAuthChannel->GetLoadGroup(getter_AddRefs(loadGroup));
+  if (NS_FAILED(rv)) return true;
+
+  nsCOMPtr<nsIPromptService> promptSvc =
+      do_GetService("@mozilla.org/prompter;1", &rv);
+  if (NS_FAILED(rv) || !promptSvc) {
+    return true;
+  }
+
+  // do not prompt again
+  mSuppressDefensiveAuth = true;
+
+  // Get current browsing context to use as prompt parent
+  nsCOMPtr<nsIChannel> chan = do_QueryInterface(mAuthChannel);
+  if (!chan) {
+    return true;
+  }
+
+  nsCOMPtr<nsILoadInfo> loadInfo = chan->LoadInfo();
+  RefPtr<mozilla::dom::BrowsingContext> browsingContext;
+  loadInfo->GetBrowsingContext(getter_AddRefs(browsingContext));
+
+  bool confirmed;
+  if (doYesNoPrompt) {
+    int32_t choice;
+    bool checkState = false;
+    rv = promptSvc->ConfirmExBC(
+        browsingContext, StaticPrefs::prompts_modalType_confirmAuth(), nullptr,
+        msg.get(),
+        nsIPromptService::BUTTON_POS_1_DEFAULT +
+            nsIPromptService::STD_YES_NO_BUTTONS,
+        nullptr, nullptr, nullptr, nullptr, &checkState, &choice);
+    if (NS_FAILED(rv)) return true;
+
+    confirmed = choice == 0;
+  } else {
+    rv = promptSvc->ConfirmBC(browsingContext,
+                              StaticPrefs::prompts_modalType_confirmAuth(),
+                              nullptr, msg.get(), &confirmed);
+    if (NS_FAILED(rv)) return true;
+  }
+
+  return confirmed;
+}
+
+void nsHttpChannelAuthProvider::SetAuthorizationHeader(
+    nsHttpAuthCache* authCache, const nsHttpAtom& header,
+    const nsACString& scheme, const nsACString& host, int32_t port,
+    const nsACString& path, nsHttpAuthIdentity& ident) {
+  nsHttpAuthEntry* entry = nullptr;
+  nsresult rv;
+
+  // set informations that depend on whether
+  // we're authenticating against a proxy
+  // or a webserver
+  nsISupports** continuationState;
+
+  nsAutoCString suffix;
+  if (header == nsHttp::Proxy_Authorization) {
+    continuationState = &mProxyAuthContinuationState;
+
+    if (mProxyInfo) {
+      nsAutoCString type;
+      mProxyInfo->GetType(type);
+      if (type.EqualsLiteral("https")) {
+        // Let this be overriden by anything from the cache.
+        auto const& pa = mProxyInfo->ProxyAuthorizationHeader();
+        if (!pa.IsEmpty()) {
+          rv = mAuthChannel->SetProxyCredentials(pa);
+          MOZ_ASSERT(NS_SUCCEEDED(rv));
+        }
+      }
+    }
+  } else {
+    continuationState = &mAuthContinuationState;
+
+    nsCOMPtr<nsIChannel> chan = do_QueryInterface(mAuthChannel);
+    GetOriginAttributesSuffix(chan, suffix);
+  }
+
+  rv = authCache->GetAuthEntryForPath(scheme, host, port, path, suffix, &entry);
+  if (NS_SUCCEEDED(rv)) {
+    // if we are trying to add a header for origin server auth and if the
+    // URL contains an explicit username, then try the given username first.
+    // we only want to do this, however, if we know the URL requires auth
+    // based on the presence of an auth cache entry for this URL (which is
+    // true since we are here).  but, if the username from the URL matches
+    // the username from the cache, then we should prefer the password
+    // stored in the cache since that is most likely to be valid.
+    if (header == nsHttp::Authorization && entry->Domain()[0] == '\0') {
+      GetIdentityFromURI(0, ident);
+      // if the usernames match, then clear the ident so we will pick
+      // up the one from the auth cache instead.
+      // when this is undesired, specify LOAD_EXPLICIT_CREDENTIALS load
+      // flag.
+      if (ident.User() == entry->User()) {
+        uint32_t loadFlags;
+        if (NS_SUCCEEDED(mAuthChannel->GetLoadFlags(&loadFlags)) &&
+            !(loadFlags & nsIChannel::LOAD_EXPLICIT_CREDENTIALS)) {
+          ident.Clear();
+        }
+      }
+    }
+    bool identFromURI;
+    if (ident.IsEmpty()) {
+      ident = entry->Identity();
+      identFromURI = false;
+    } else {
+      identFromURI = true;
+    }
+
+    nsCString temp;  // this must have the same lifetime as creds
+    nsAutoCString creds(entry->Creds());
+    // we can only send a preemptive Authorization header if we have either
+    // stored credentials or a stored challenge from which to derive
+    // credentials.  if the identity is from the URI, then we cannot use
+    // the stored credentials.
+    if ((creds.IsEmpty() || identFromURI) && !entry->Challenge().IsEmpty()) {
+      nsCOMPtr<nsIHttpAuthenticator> auth;
+      nsAutoCString unused;
+      rv = GetAuthenticator(entry->Challenge(), unused, getter_AddRefs(auth));
+      if (NS_SUCCEEDED(rv)) {
+        bool proxyAuth = (header == nsHttp::Proxy_Authorization);
+        rv = GenCredsAndSetEntry(auth, proxyAuth, scheme, host, port, path,
+                                 entry->Realm(), entry->Challenge(), ident,
+                                 entry->mMetaData, temp);
+        if (NS_SUCCEEDED(rv)) creds = temp;
+
+        // make sure the continuation state is null since we do not
+        // support mixing preemptive and 'multirequest' authentication.
+        NS_IF_RELEASE(*continuationState);
+      }
+    }
+    if (!creds.IsEmpty()) {
+      LOG(("   adding \"%s\" request header\n", header.get()));
+      if (header == nsHttp::Proxy_Authorization) {
+        rv = mAuthChannel->SetProxyCredentials(creds);
+        MOZ_ASSERT(NS_SUCCEEDED(rv));
+      } else {
+        rv = mAuthChannel->SetWWWCredentials(creds);
+        MOZ_ASSERT(NS_SUCCEEDED(rv));
+      }
+
+      // suppress defensive auth prompting for this channel since we know
+      // that we already prompted at least once this session.  we only do
+      // this for non-proxy auth since the URL's userpass is not used for
+      // proxy auth.
+      if (header == nsHttp::Authorization) mSuppressDefensiveAuth = true;
+    } else {
+      ident.Clear();  // don't remember the identity
+    }
+  }
+}
+
+nsresult nsHttpChannelAuthProvider::GetCurrentPath(nsACString& path) {
+  nsresult rv;
+  nsCOMPtr<nsIURL> url = do_QueryInterface(mURI);
+  if (url) {
+    rv = url->GetDirectory(path);
+  } else {
+    rv = mURI->GetPathQueryRef(path);
+  }
+  return rv;
+}
+
+NS_IMPL_ISUPPORTS(nsHttpChannelAuthProvider, nsICancelable,
+                  nsIHttpChannelAuthProvider, nsIAuthPromptCallback,
+                  nsIHttpAuthenticatorCallback)
+
+}  // namespace mozilla::net