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/* vim:set ts=4 sw=2 sts=2 et cindent: */
/* 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/. */
//
// HTTP Negotiate Authentication Support Module
//
// Described by IETF Internet draft: draft-brezak-kerberos-http-00.txt
// (formerly draft-brezak-spnego-http-04.txt)
//
// Also described here:
//
#include <string.h>
#include <stdlib.h>
#include "nsAuth.h"
#include "nsHttpNegotiateAuth.h"
#include "nsIHttpAuthenticableChannel.h"
#include "nsIAuthModule.h"
#include "nsIPrefBranch.h"
#include "nsIPrefService.h"
#include "nsIProxyInfo.h"
#include "nsIURI.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsNetCID.h"
#include "nsProxyRelease.h"
#include "plbase64.h"
#include "plstr.h"
#include "mozilla/Base64.h"
#include "mozilla/Logging.h"
#include "mozilla/Tokenizer.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Unused.h"
#include "prmem.h"
#include "prnetdb.h"
#include "mozilla/Likely.h"
#include "mozilla/Sprintf.h"
#include "nsIChannel.h"
#include "nsNetUtil.h"
#include "nsThreadUtils.h"
#include "nsIHttpAuthenticatorCallback.h"
#include "mozilla/Mutex.h"
#include "nsICancelable.h"
#include "nsUnicharUtils.h"
#include "mozilla/net/HttpAuthUtils.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/net/DNS.h"
using mozilla::Base64Decode;
//-----------------------------------------------------------------------------
static const char kNegotiate[] = "Negotiate";
static const char kNegotiateAuthTrustedURIs[] =
"network.negotiate-auth.trusted-uris";
static const char kNegotiateAuthDelegationURIs[] =
"network.negotiate-auth.delegation-uris";
static const char kNegotiateAuthAllowProxies[] =
"network.negotiate-auth.allow-proxies";
static const char kNegotiateAuthAllowNonFqdn[] =
"network.negotiate-auth.allow-non-fqdn";
static const char kNegotiateAuthSSPI[] = "network.auth.use-sspi";
static const char kSSOinPBmode[] = "network.auth.private-browsing-sso";
mozilla::StaticRefPtr<nsHttpNegotiateAuth> nsHttpNegotiateAuth::gSingleton;
#define kNegotiateLen (sizeof(kNegotiate) - 1)
#define DEFAULT_THREAD_TIMEOUT_MS 30000
//-----------------------------------------------------------------------------
// Return false when the channel comes from a Private browsing window.
static bool TestNotInPBMode(nsIHttpAuthenticableChannel* authChannel,
bool proxyAuth) {
// Proxy should go all the time, it's not considered a privacy leak
// to send default credentials to a proxy.
if (proxyAuth) {
return true;
}
nsCOMPtr<nsIChannel> bareChannel = do_QueryInterface(authChannel);
MOZ_ASSERT(bareChannel);
if (!NS_UsePrivateBrowsing(bareChannel)) {
return true;
}
nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (prefs) {
bool ssoInPb;
if (NS_SUCCEEDED(prefs->GetBoolPref(kSSOinPBmode, &ssoInPb)) && ssoInPb) {
return true;
}
// When the "Never remember history" option is set, all channels are
// set PB mode flag, but here we want to make an exception, users
// want their credentials go out.
bool dontRememberHistory;
if (NS_SUCCEEDED(prefs->GetBoolPref("browser.privatebrowsing.autostart",
&dontRememberHistory)) &&
dontRememberHistory) {
return true;
}
}
return false;
}
already_AddRefed<nsIHttpAuthenticator> nsHttpNegotiateAuth::GetOrCreate() {
nsCOMPtr<nsIHttpAuthenticator> authenticator;
if (gSingleton) {
authenticator = gSingleton;
} else {
gSingleton = new nsHttpNegotiateAuth();
mozilla::ClearOnShutdown(&gSingleton);
authenticator = gSingleton;
}
return authenticator.forget();
}
NS_IMETHODIMP
nsHttpNegotiateAuth::GetAuthFlags(uint32_t* flags) {
//
// Negotiate Auth creds should not be reused across multiple requests.
// Only perform the negotiation when it is explicitly requested by the
// server. Thus, do *NOT* use the "REUSABLE_CREDENTIALS" flag here.
//
// CONNECTION_BASED is specified instead of REQUEST_BASED since we need
// to complete a sequence of transactions with the server over the same
// connection.
//
*flags = CONNECTION_BASED | IDENTITY_IGNORED;
return NS_OK;
}
//
// Always set *identityInvalid == FALSE here. This
// will prevent the browser from popping up the authentication
// prompt window. Because GSSAPI does not have an API
// for fetching initial credentials (ex: A Kerberos TGT),
// there is no correct way to get the users credentials.
//
NS_IMETHODIMP
nsHttpNegotiateAuth::ChallengeReceived(nsIHttpAuthenticableChannel* authChannel,
const nsACString& challenge,
bool isProxyAuth,
nsISupports** sessionState,
nsISupports** continuationState,
bool* identityInvalid) {
nsIAuthModule* rawModule = (nsIAuthModule*)*continuationState;
*identityInvalid = false;
if (rawModule) {
return NS_OK;
}
nsresult rv;
nsCOMPtr<nsIAuthModule> module;
nsCOMPtr<nsIURI> uri;
rv = authChannel->GetURI(getter_AddRefs(uri));
if (NS_FAILED(rv)) return rv;
uint32_t req_flags = nsIAuthModule::REQ_DEFAULT;
nsAutoCString service;
if (isProxyAuth) {
if (!TestBoolPref(kNegotiateAuthAllowProxies)) {
LOG(("nsHttpNegotiateAuth::ChallengeReceived proxy auth blocked\n"));
return NS_ERROR_ABORT;
}
req_flags |= nsIAuthModule::REQ_PROXY_AUTH;
nsCOMPtr<nsIProxyInfo> proxyInfo;
authChannel->GetProxyInfo(getter_AddRefs(proxyInfo));
NS_ENSURE_STATE(proxyInfo);
proxyInfo->GetHost(service);
} else {
bool allowed =
TestNotInPBMode(authChannel, isProxyAuth) &&
(TestNonFqdn(uri) || mozilla::net::auth::URIMatchesPrefPattern(
uri, kNegotiateAuthTrustedURIs));
if (!allowed) {
LOG(("nsHttpNegotiateAuth::ChallengeReceived URI blocked\n"));
return NS_ERROR_ABORT;
}
bool delegation = mozilla::net::auth::URIMatchesPrefPattern(
uri, kNegotiateAuthDelegationURIs);
if (delegation) {
LOG((" using REQ_DELEGATE\n"));
req_flags |= nsIAuthModule::REQ_DELEGATE;
}
rv = uri->GetAsciiHost(service);
if (NS_FAILED(rv)) return rv;
}
LOG((" service = %s\n", service.get()));
//
// The correct service name for IIS servers is "HTTP/f.q.d.n", so
// construct the proper service name for passing to "gss_import_name".
//
// TODO: Possibly make this a configurable service name for use
// with non-standard servers that use stuff like "khttp/f.q.d.n"
// instead.
//
service.InsertLiteral("HTTP@", 0);
const char* authType;
if (TestBoolPref(kNegotiateAuthSSPI)) {
LOG((" using negotiate-sspi\n"));
authType = "negotiate-sspi";
} else {
LOG((" using negotiate-gss\n"));
authType = "negotiate-gss";
}
MOZ_ALWAYS_TRUE(module = nsIAuthModule::CreateInstance(authType));
rv = module->Init(service, req_flags, u""_ns, u""_ns, u""_ns);
if (NS_FAILED(rv)) {
return rv;
}
module.forget(continuationState);
return NS_OK;
}
NS_IMPL_ISUPPORTS(nsHttpNegotiateAuth, nsIHttpAuthenticator)
namespace {
//
// GetNextTokenCompleteEvent
//
// This event is fired on main thread when async call of
// nsHttpNegotiateAuth::GenerateCredentials is finished. During the Run()
// method the nsIHttpAuthenticatorCallback::OnCredsAvailable is called with
// obtained credentials, flags and NS_OK when successful, otherwise
// NS_ERROR_FAILURE is returned as a result of failed operation.
//
class GetNextTokenCompleteEvent final : public nsIRunnable,
public nsICancelable {
public:
NS_DECL_THREADSAFE_ISUPPORTS
explicit GetNextTokenCompleteEvent(nsIHttpAuthenticatorCallback* aCallback)
: mCallback(aCallback) {}
nsresult DispatchSuccess(const nsACString& aCreds, uint32_t aFlags,
already_AddRefed<nsISupports> aSessionState,
already_AddRefed<nsISupports> aContinuationState) {
// Called from worker thread
MOZ_ASSERT(!NS_IsMainThread());
mCreds = aCreds;
mFlags = aFlags;
mResult = NS_OK;
mSessionState = aSessionState;
mContinuationState = aContinuationState;
return NS_DispatchToMainThread(this, NS_DISPATCH_NORMAL);
}
nsresult DispatchError(already_AddRefed<nsISupports> aSessionState,
already_AddRefed<nsISupports> aContinuationState) {
// Called from worker thread
MOZ_ASSERT(!NS_IsMainThread());
mResult = NS_ERROR_FAILURE;
mSessionState = aSessionState;
mContinuationState = aContinuationState;
return NS_DispatchToMainThread(this, NS_DISPATCH_NORMAL);
}
NS_IMETHODIMP Run() override {
// Runs on main thread
MOZ_ASSERT(NS_IsMainThread());
if (!mCancelled) {
nsCOMPtr<nsIHttpAuthenticatorCallback> callback;
callback.swap(mCallback);
callback->OnCredsGenerated(mCreds, mFlags, mResult, mSessionState,
mContinuationState);
}
return NS_OK;
}
NS_IMETHODIMP Cancel(nsresult aReason) override {
// Supposed to be called from main thread
MOZ_ASSERT(NS_IsMainThread());
mCancelled = true;
nsCOMPtr<nsIHttpAuthenticatorCallback> callback = std::move(mCallback);
if (callback) {
callback->OnCredsGenerated(mCreds, mFlags, aReason, nullptr, nullptr);
}
return NS_OK;
}
private:
virtual ~GetNextTokenCompleteEvent() = default;
nsCOMPtr<nsIHttpAuthenticatorCallback> mCallback;
nsCString mCreds;
uint32_t mFlags = 0;
nsresult mResult = NS_OK;
bool mCancelled = false;
nsCOMPtr<nsISupports> mSessionState;
nsCOMPtr<nsISupports> mContinuationState;
};
NS_IMPL_ISUPPORTS(GetNextTokenCompleteEvent, nsIRunnable, nsICancelable)
//
// GetNextTokenRunnable
//
// This runnable is created by GenerateCredentialsAsync and it runs
// on the background thread pool and calls GenerateCredentials.
//
class GetNextTokenRunnable final : public mozilla::Runnable {
~GetNextTokenRunnable() override = default;
public:
GetNextTokenRunnable(
nsMainThreadPtrHandle<nsIHttpAuthenticableChannel>& authChannel,
const nsACString& challenge, bool isProxyAuth, const nsAString& domain,
const nsAString& username, const nsAString& password,
nsISupports* sessionState, nsISupports* continuationState,
GetNextTokenCompleteEvent* aCompleteEvent)
: mozilla::Runnable("GetNextTokenRunnable"),
mAuthChannel(authChannel),
mChallenge(challenge),
mIsProxyAuth(isProxyAuth),
mDomain(domain),
mUsername(username),
mPassword(password),
mSessionState(sessionState),
mContinuationState(continuationState),
mCompleteEvent(aCompleteEvent) {}
NS_IMETHODIMP Run() override {
// Runs on worker thread
MOZ_ASSERT(!NS_IsMainThread());
nsCString creds;
uint32_t flags;
nsresult rv = ObtainCredentialsAndFlags(creds, &flags);
// Passing session and continuation state this way to not touch
// referencing of the object that may not be thread safe.
// Not having a thread safe referencing doesn't mean the object
// cannot be used on multiple threads (one example is nsAuthSSPI.)
// This ensures state objects will be destroyed on the main thread
// when not changed by GenerateCredentials.
if (NS_FAILED(rv)) {
return mCompleteEvent->DispatchError(mSessionState.forget(),
mContinuationState.forget());
}
return mCompleteEvent->DispatchSuccess(creds, flags, mSessionState.forget(),
mContinuationState.forget());
}
NS_IMETHODIMP ObtainCredentialsAndFlags(nsCString& aCreds, uint32_t* aFlags) {
nsresult rv;
// Use negotiate service to call GenerateCredentials outside of main thread
nsCOMPtr<nsIHttpAuthenticator> authenticator = new nsHttpNegotiateAuth();
nsISupports* sessionState = mSessionState;
nsISupports* continuationState = mContinuationState;
// The continuationState is for the sake of completeness propagated
// to the caller (despite it is not changed in any GenerateCredentials
// implementation).
//
// The only implementation that use sessionState is the
// nsHttpDigestAuth::GenerateCredentials. Since there's no reason
// to implement nsHttpDigestAuth::GenerateCredentialsAsync
// because digest auth does not block the main thread, we won't
// propagate changes to sessionState to the caller because of
// the change is too complicated on the caller side.
//
// Should any of the session or continuation states change inside
// this method, they must be threadsafe.
rv = authenticator->GenerateCredentials(
mAuthChannel, mChallenge, mIsProxyAuth, mDomain, mUsername, mPassword,
&sessionState, &continuationState, aFlags, aCreds);
if (mSessionState != sessionState) {
mSessionState = sessionState;
}
if (mContinuationState != continuationState) {
mContinuationState = continuationState;
}
return rv;
}
private:
nsMainThreadPtrHandle<nsIHttpAuthenticableChannel> mAuthChannel;
nsCString mChallenge;
bool mIsProxyAuth;
nsString mDomain;
nsString mUsername;
nsString mPassword;
nsCOMPtr<nsISupports> mSessionState;
nsCOMPtr<nsISupports> mContinuationState;
RefPtr<GetNextTokenCompleteEvent> mCompleteEvent;
};
} // anonymous namespace
NS_IMETHODIMP
nsHttpNegotiateAuth::GenerateCredentialsAsync(
nsIHttpAuthenticableChannel* authChannel,
nsIHttpAuthenticatorCallback* aCallback, const nsACString& challenge,
bool isProxyAuth, const nsAString& domain, const nsAString& username,
const nsAString& password, nsISupports* sessionState,
nsISupports* continuationState, nsICancelable** aCancelable) {
NS_ENSURE_ARG(aCallback);
NS_ENSURE_ARG_POINTER(aCancelable);
RefPtr<GetNextTokenCompleteEvent> cancelEvent =
new GetNextTokenCompleteEvent(aCallback);
nsMainThreadPtrHandle<nsIHttpAuthenticableChannel> handle(
new nsMainThreadPtrHolder<nsIHttpAuthenticableChannel>(
"nsIHttpAuthenticableChannel", authChannel, false));
nsCOMPtr<nsIRunnable> getNextTokenRunnable = new GetNextTokenRunnable(
handle, challenge, isProxyAuth, domain, username, password, sessionState,
continuationState, cancelEvent);
nsresult rv = NS_DispatchBackgroundTask(
getNextTokenRunnable, nsIEventTarget::DISPATCH_EVENT_MAY_BLOCK);
NS_ENSURE_SUCCESS(rv, rv);
cancelEvent.forget(aCancelable);
return NS_OK;
}
//
// GenerateCredentials
//
// This routine is responsible for creating the correct authentication
// blob to pass to the server that requested "Negotiate" authentication.
//
NS_IMETHODIMP
nsHttpNegotiateAuth::GenerateCredentials(
nsIHttpAuthenticableChannel* authChannel, const nsACString& aChallenge,
bool isProxyAuth, const nsAString& domain, const nsAString& username,
const nsAString& password, nsISupports** sessionState,
nsISupports** continuationState, uint32_t* flags, nsACString& creds) {
// ChallengeReceived must have been called previously.
nsIAuthModule* module = (nsIAuthModule*)*continuationState;
NS_ENSURE_TRUE(module, NS_ERROR_NOT_INITIALIZED);
*flags = USING_INTERNAL_IDENTITY;
LOG(("nsHttpNegotiateAuth::GenerateCredentials() [challenge=%s]\n",
aChallenge.BeginReading()));
#ifdef DEBUG
bool isGssapiAuth = StringBeginsWith(aChallenge, "Negotiate"_ns,
nsCaseInsensitiveCStringComparator);
NS_ASSERTION(isGssapiAuth, "Unexpected challenge");
#endif
//
// If the "Negotiate:" header had some data associated with it,
// that data should be used as the input to this call. This may
// be a continuation of an earlier call because GSSAPI authentication
// often takes multiple round-trips to complete depending on the
// context flags given. We want to use MUTUAL_AUTHENTICATION which
// generally *does* require multiple round-trips. Don't assume
// auth can be completed in just 1 call.
//
nsAutoCString inToken;
if (aChallenge.Length() > kNegotiateLen) {
nsDependentCSubstring challenge(aChallenge, kNegotiateLen);
uint32_t startPos = 0;
while (startPos < challenge.Length() && challenge[startPos] == ' ') {
startPos++;
}
if (startPos == challenge.Length()) {
return NS_ERROR_UNEXPECTED;
}
// strip off any padding (see bug 230351)
uint32_t len = challenge.Length();
while (len > startPos && challenge[len - 1] == '=') {
len--;
}
//
// Decode the response that followed the "Negotiate" token
//
(void)Base64Decode(
nsDependentCSubstring(challenge, startPos, len - startPos), inToken);
}
void* outToken = nullptr;
uint32_t outTokenLen = 0;
nsresult rv = module->GetNextToken(inToken.get(), inToken.Length(), &outToken,
&outTokenLen);
if (NS_FAILED(rv)) {
if (outToken) {
// Technically if the call fails we shouln't have allocated, but
// Coverity doesn't know that.
free(outToken);
}
return rv;
}
if (outTokenLen == 0) {
LOG((" No output token to send, exiting"));
return NS_ERROR_FAILURE;
}
//
// base64 encode the output token.
//
nsAutoCString encodedToken;
rv = mozilla::Base64Encode(
nsDependentCSubstring((char*)outToken, outTokenLen), encodedToken);
free(outToken);
if (NS_FAILED(rv)) {
return rv;
}
LOG((" Sending a token of length %d\n", outTokenLen));
creds = nsPrintfCString("%s %s", kNegotiate, encodedToken.get());
return rv;
}
bool nsHttpNegotiateAuth::TestBoolPref(const char* pref) {
nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (!prefs) return false;
bool val;
nsresult rv = prefs->GetBoolPref(pref, &val);
if (NS_FAILED(rv)) return false;
return val;
}
bool nsHttpNegotiateAuth::TestNonFqdn(nsIURI* uri) {
nsAutoCString host;
if (!TestBoolPref(kNegotiateAuthAllowNonFqdn)) {
return false;
}
if (NS_FAILED(uri->GetAsciiHost(host))) {
return false;
}
// return true if host does not contain a dot and is not an ip address
return !host.IsEmpty() && !host.Contains('.') &&
!mozilla::net::HostIsIPLiteral(host);
}