SPDY proxy authentication support.

chrome/browser/net/spdyproxy/http_auth_handler_spdyproxy.cc

+// Copyright (c) 2012 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 "chrome/browser/net/spdyproxy/http_auth_handler_spdyproxy.h"
+
+#include <string>
+
+#include "base/i18n/icu_string_conversions.h"
+#include "base/metrics/histogram.h"
+#include "base/string_util.h"
+#include "base/utf_string_conversions.h"
+#include "net/base/net_errors.h"
+#include "net/http/http_auth.h"
+#include "net/http/http_request_info.h"
+
+namespace spdyproxy {
+
+using net::AuthCredentials;
+using net::BoundNetLog;
+using net::CompletionCallback;
+using net::HttpAuth;
+using net::HttpAuthHandler;
+using net::HttpAuthHandlerFactory;
+using net::HttpRequestInfo;
+using net::HttpUtil;
+
+HttpAuthHandlerSpdyProxy::Factory::Factory(
+    const GURL& authorized_spdyproxy_origin)
+    : authorized_spdyproxy_origin_(authorized_spdyproxy_origin) {
+}
+
+HttpAuthHandlerSpdyProxy::Factory::~Factory() {
+}
+
+int HttpAuthHandlerSpdyProxy::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 a spdyproxy auth proxy has not been set, refuse all requests to use this
+  // auth handler.
+  if (authorized_spdyproxy_origin_.possibly_invalid_spec().empty()) {
+    VLOG(1) << "SpdyProxy auth without configuring authorized origin.";
+    return net::ERR_UNSUPPORTED_AUTH_SCHEME;
+  }
+
+  // We ensure that this authentication handler is used only with an authorized
+  // SPDY proxy, since otherwise a user's authentication token can be
+  // sniffed by a malicious proxy that presents an appropriate challenge.
+  const GURL origin_origin = origin.GetOrigin();
+  if (!(target == HttpAuth::AUTH_PROXY &&
+        origin_origin == authorized_spdyproxy_origin_)) {
+    UMA_HISTOGRAM_COUNTS("Net.UnexpectedSpdyProxyAuth", 1);
+    VLOG(1) << "SpdyProxy auth request with an unexpected config."
+            << " origin: " << origin_origin.possibly_invalid_spec()
+            << " authorized_origin: "
+            << authorized_spdyproxy_origin_.possibly_invalid_spec();
+    return net::ERR_UNSUPPORTED_AUTH_SCHEME;
+  }
+
+  scoped_ptr<HttpAuthHandler> tmp_handler(
+      new HttpAuthHandlerSpdyProxy(authorized_spdyproxy_origin_));
+  if (!tmp_handler->InitFromChallenge(challenge, target, origin, net_log))
+    return net::ERR_INVALID_RESPONSE;
+  handler->swap(tmp_handler);
+  return net::OK;
+}
+
+HttpAuthHandlerSpdyProxy::HttpAuthHandlerSpdyProxy(
+    const GURL& authorized_spdyproxy_origin)
+    : HttpAuthHandler(),
+      authorized_spdyproxy_origin_(authorized_spdyproxy_origin) {
+}
+
+HttpAuth::AuthorizationResult
+HttpAuthHandlerSpdyProxy::HandleAnotherChallenge(
+    HttpAuth::ChallengeTokenizer* challenge) {
+  // SpdyProxy authentication is always a single round, so any responses
+  // should be treated as a rejection.
+  return HttpAuth::AUTHORIZATION_RESULT_REJECT;
+}
+
+bool HttpAuthHandlerSpdyProxy::NeedsIdentity() {
+  return true;
+}
+
+bool HttpAuthHandlerSpdyProxy::AllowsDefaultCredentials() {
+  return false;
+}
+
+bool HttpAuthHandlerSpdyProxy::AllowsExplicitCredentials() {
+  return true;
+}
+
+bool HttpAuthHandlerSpdyProxy::Init(
+    HttpAuth::ChallengeTokenizer* challenge) {
+  auth_scheme_ = HttpAuth::AUTH_SCHEME_SPDYPROXY;
+  score_ = 5;
+  properties_ = ENCRYPTS_IDENTITY;
+  return ParseChallenge(challenge);
+}
+
+int HttpAuthHandlerSpdyProxy::GenerateAuthTokenImpl(
+    const AuthCredentials* credentials, const HttpRequestInfo* request,
+    const CompletionCallback&, std::string* auth_token) {
+  DCHECK(credentials);
+  if (credentials->password().length() == 0) {
+    DVLOG(1) << "Received a SpdyProxy auth token request without an "
+             << "available token.";
+    return -1;
+  }
+  *auth_token = "SpdyProxy ps=\"" + ps_token_ + "\", sid=\"" +
+      UTF16ToUTF8(credentials->password()) + "\"";
+  return net::OK;
+}
+
+bool HttpAuthHandlerSpdyProxy::ParseChallenge(
+    HttpAuth::ChallengeTokenizer* challenge) {
+
+  // Verify the challenge's auth-scheme.
+  if (!LowerCaseEqualsASCII(challenge->scheme(), "spdyproxy")) {
+    VLOG(1) << "Parsed challenge without SpdyProxy type";
+    return false;
+  }
+
+  HttpUtil::NameValuePairsIterator parameters = challenge->param_pairs();
+
+  // Loop through all the properties.
+  while (parameters.GetNext()) {
+    // FAIL -- couldn't parse a property.
+    if (!ParseChallengeProperty(parameters.name(),
+                                parameters.value()))
+      return false;
+  }
+  // Check if tokenizer failed.
+  if (!parameters.valid())
+    return false;
+
+  // Check that the required properties were provided.
+  if (realm_.empty())
+    return false;
+
+  if (ps_token_.empty())
+    return false;
+
+  return true;
+}
+
+bool HttpAuthHandlerSpdyProxy::ParseChallengeProperty(
+    const std::string& name, const std::string& value) {
+  if (LowerCaseEqualsASCII(name, "realm")) {
+    std::string realm;
+    if (!base::ConvertToUtf8AndNormalize(value, base::kCodepageLatin1, &realm))
+      return false;
+    realm_ = realm;
+  } else if (LowerCaseEqualsASCII(name, "ps")) {
+    ps_token_ = value;
+  } else {
+    VLOG(1) << "Skipping unrecognized SpdyProxy auth property, " << name;
+  }
+  return true;
+}
+
+}  // namespace spdyproxy