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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/http/http_auth_handler_negotiate.h"
#include "base/logging.h"
#include "net/base/address_family.h"
#include "net/base/host_resolver.h"
#include "net/base/net_errors.h"
#include "net/http/http_auth_filter.h"
#include "net/http/url_security_manager.h"
namespace net {
HttpAuthHandlerNegotiate::HttpAuthHandlerNegotiate(
SSPILibrary* library,
ULONG max_token_length,
URLSecurityManager* url_security_manager,
bool disable_cname_lookup,
bool use_port)
: auth_sspi_(library, "Negotiate", NEGOSSP_NAME, max_token_length),
user_callback_(NULL),
ALLOW_THIS_IN_INITIALIZER_LIST(resolve_cname_callback_(
this, &HttpAuthHandlerNegotiate::OnResolveCanonicalName)),
disable_cname_lookup_(disable_cname_lookup),
use_port_(use_port),
url_security_manager_(url_security_manager) {
}
HttpAuthHandlerNegotiate::~HttpAuthHandlerNegotiate() {
}
int HttpAuthHandlerNegotiate::GenerateAuthToken(
const std::wstring& username,
const std::wstring& password,
const HttpRequestInfo* request,
const ProxyInfo* proxy,
std::string* auth_token) {
return auth_sspi_.GenerateAuthToken(
&username,
&password,
spn_,
request,
proxy,
auth_token);
}
// The Negotiate challenge header looks like:
// WWW-Authenticate: NEGOTIATE auth-data
bool HttpAuthHandlerNegotiate::Init(HttpAuth::ChallengeTokenizer* challenge) {
scheme_ = "negotiate";
score_ = 4;
properties_ = ENCRYPTS_IDENTITY | IS_CONNECTION_BASED;
return auth_sspi_.ParseChallenge(challenge);
}
// Require identity on first pass instead of second.
bool HttpAuthHandlerNegotiate::NeedsIdentity() {
return auth_sspi_.NeedsIdentity();
}
bool HttpAuthHandlerNegotiate::IsFinalRound() {
return auth_sspi_.IsFinalRound();
}
bool HttpAuthHandlerNegotiate::AllowsDefaultCredentials() {
if (target_ == HttpAuth::AUTH_PROXY)
return true;
if (!url_security_manager_)
return false;
return url_security_manager_->CanUseDefaultCredentials(origin_);
}
bool HttpAuthHandlerNegotiate::NeedsCanonicalName() {
if (!spn_.empty())
return false;
if (disable_cname_lookup_) {
spn_ = CreateSPN(address_list_, origin_);
address_list_.Reset();
return false;
}
return true;
}
int HttpAuthHandlerNegotiate::ResolveCanonicalName(
HostResolver* resolver, CompletionCallback* callback) {
// TODO(cbentzel): Add reverse DNS lookup for numeric addresses.
DCHECK(!single_resolve_.get());
DCHECK(!disable_cname_lookup_);
DCHECK(callback);
HostResolver::RequestInfo info(origin_.host(), 0);
info.set_host_resolver_flags(HOST_RESOLVER_CANONNAME);
single_resolve_.reset(new SingleRequestHostResolver(resolver));
int rv = single_resolve_->Resolve(info, &address_list_,
&resolve_cname_callback_,
net_log_);
if (rv == ERR_IO_PENDING) {
user_callback_ = callback;
return rv;
}
OnResolveCanonicalName(rv);
// Always return OK. OnResolveCanonicalName logs the error code if not
// OK and attempts to use the original origin_ hostname rather than failing
// the auth attempt completely.
return OK;
}
void HttpAuthHandlerNegotiate::OnResolveCanonicalName(int result) {
if (result != OK) {
// Even in the error case, try to use origin_.host instead of
// passing the failure on to the caller.
LOG(INFO) << "Problem finding canonical name for SPN for host "
<< origin_.host() << ": " << ErrorToString(result);
result = OK;
}
spn_ = CreateSPN(address_list_, origin_);
address_list_.Reset();
if (user_callback_) {
CompletionCallback* callback = user_callback_;
user_callback_ = NULL;
callback->Run(result);
}
}
std::wstring HttpAuthHandlerNegotiate::CreateSPN(
const AddressList& address_list, const GURL& origin) {
// Kerberos SPNs are in the form HTTP/<host>:<port>
// http://msdn.microsoft.com/en-us/library/ms677601%28VS.85%29.aspx
//
// However, reality differs from the specification. A good description of
// the problems can be found here:
// http://blog.michelbarneveld.nl/michel/archive/2009/11/14/the-reason-why-kb911149-and-kb908209-are-not-the-soluton.aspx
//
// Typically the <host> portion should be the canonical FQDN for the service.
// If this could not be resolved, the original hostname in the URL will be
// attempted instead. However, some intranets register SPNs using aliases
// for the same canonical DNS name to allow multiple web services to reside
// on the same host machine without requiring different ports. IE6 and IE7
// have hotpatches that allow the default behavior to be overridden.
// http://support.microsoft.com/kb/911149
// http://support.microsoft.com/kb/938305
//
// According to the spec, the <port> option should be included if it is a
// non-standard port (i.e. not 80 or 443 in the HTTP case). However,
// historically browsers have not included the port, even on non-standard
// ports. IE6 required a hotpatch and a registry setting to enable
// including non-standard ports, and IE7 and IE8 also require the same
// registry setting, but no hotpatch. Firefox does not appear to have an
// option to include non-standard ports as of 3.6.
// http://support.microsoft.com/kb/908209
//
// Without any command-line flags, Chrome matches the behavior of Firefox
// and IE. Users can override the behavior so aliases are allowed and
// non-standard ports are included.
int port = origin.EffectiveIntPort();
std::string server;
if (!address_list.GetCanonicalName(&server))
server = origin.host();
if (port != 80 && port != 443 && use_port_) {
return ASCIIToWide(StringPrintf("HTTP/%s:%d", server.c_str(), port));
} else {
return ASCIIToWide(StringPrintf("HTTP/%s", server.c_str()));
}
}
int HttpAuthHandlerNegotiate::GenerateDefaultAuthToken(
const HttpRequestInfo* request,
const ProxyInfo* proxy,
std::string* auth_token) {
return auth_sspi_.GenerateAuthToken(
NULL, // username
NULL, // password
spn_,
request,
proxy,
auth_token);
}
HttpAuthHandlerNegotiate::Factory::Factory()
: disable_cname_lookup_(false),
use_port_(false),
max_token_length_(0),
first_creation_(true),
is_unsupported_(false),
sspi_library_(SSPILibrary::GetDefault()) {
}
HttpAuthHandlerNegotiate::Factory::~Factory() {
}
int HttpAuthHandlerNegotiate::Factory::CreateAuthHandler(
HttpAuth::ChallengeTokenizer* challenge,
HttpAuth::Target target,
const GURL& origin,
CreateReason reason,
int digest_nonce_count,
const BoundNetLog& net_log,
scoped_ptr<HttpAuthHandler>* handler) {
if (is_unsupported_ || reason == CREATE_PREEMPTIVE)
return ERR_UNSUPPORTED_AUTH_SCHEME;
if (max_token_length_ == 0) {
int rv = DetermineMaxTokenLength(sspi_library_, NEGOSSP_NAME,
&max_token_length_);
if (rv == ERR_UNSUPPORTED_AUTH_SCHEME)
is_unsupported_ = true;
if (rv != OK)
return rv;
}
// TODO(cbentzel): Move towards model of parsing in the factory
// method and only constructing when valid.
scoped_ptr<HttpAuthHandler> tmp_handler(
new HttpAuthHandlerNegotiate(sspi_library_, max_token_length_,
url_security_manager(),
disable_cname_lookup_, use_port_));
if (!tmp_handler->InitFromChallenge(challenge, target, origin, net_log))
return ERR_INVALID_RESPONSE;
handler->swap(tmp_handler);
return OK;
}
} // namespace net
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