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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.h"
#include <algorithm>
#include "base/basictypes.h"
#include "base/string_util.h"
#include "net/base/net_errors.h"
#include "net/http/http_auth_handler_basic.h"
#include "net/http/http_auth_handler_digest.h"
#include "net/http/http_auth_handler_negotiate.h"
#include "net/http/http_auth_handler_ntlm.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_util.h"
namespace net {
HttpAuth::Identity::Identity() : source(IDENT_SRC_NONE), invalid(true) {}
// static
void HttpAuth::ChooseBestChallenge(
HttpAuthHandlerFactory* http_auth_handler_factory,
const HttpResponseHeaders* headers,
Target target,
const GURL& origin,
const std::set<std::string>& disabled_schemes,
const BoundNetLog& net_log,
scoped_ptr<HttpAuthHandler>* handler) {
DCHECK(http_auth_handler_factory);
DCHECK(handler->get() == NULL);
// Choose the challenge whose authentication handler gives the maximum score.
scoped_ptr<HttpAuthHandler> best;
const std::string header_name = GetChallengeHeaderName(target);
std::string cur_challenge;
void* iter = NULL;
while (headers->EnumerateHeader(&iter, header_name, &cur_challenge)) {
scoped_ptr<HttpAuthHandler> cur;
int rv = http_auth_handler_factory->CreateAuthHandlerFromString(
cur_challenge, target, origin, net_log, &cur);
if (rv != OK) {
VLOG(1) << "Unable to create AuthHandler. Status: "
<< ErrorToString(rv) << " Challenge: " << cur_challenge;
continue;
}
if (cur.get() && (!best.get() || best->score() < cur->score()) &&
(disabled_schemes.find(cur->scheme()) == disabled_schemes.end()))
best.swap(cur);
}
handler->swap(best);
}
// static
HttpAuth::AuthorizationResult HttpAuth::HandleChallengeResponse(
HttpAuthHandler* handler,
const HttpResponseHeaders* headers,
Target target,
const std::set<std::string>& disabled_schemes,
std::string* challenge_used) {
DCHECK(handler);
DCHECK(headers);
DCHECK(challenge_used);
challenge_used->clear();
const std::string& current_scheme = handler->scheme();
if (disabled_schemes.find(current_scheme) != disabled_schemes.end())
return HttpAuth::AUTHORIZATION_RESULT_REJECT;
const std::string header_name = GetChallengeHeaderName(target);
void* iter = NULL;
std::string challenge;
HttpAuth::AuthorizationResult authorization_result =
HttpAuth::AUTHORIZATION_RESULT_INVALID;
while (headers->EnumerateHeader(&iter, header_name, &challenge)) {
HttpAuth::ChallengeTokenizer props(challenge.begin(), challenge.end());
if (!LowerCaseEqualsASCII(props.scheme(), current_scheme.c_str()))
continue;
authorization_result = handler->HandleAnotherChallenge(&props);
if (authorization_result != HttpAuth::AUTHORIZATION_RESULT_INVALID) {
*challenge_used = challenge;
return authorization_result;
}
}
// Finding no matches is equivalent to rejection.
return HttpAuth::AUTHORIZATION_RESULT_REJECT;
}
void HttpAuth::ChallengeTokenizer::Init(std::string::const_iterator begin,
std::string::const_iterator end) {
// The first space-separated token is the auth-scheme.
// NOTE: we are more permissive than RFC 2617 which says auth-scheme
// is separated by 1*SP.
StringTokenizer tok(begin, end, HTTP_LWS);
if (!tok.GetNext()) {
// Default param and scheme iterators provide empty strings
return;
}
// Save the scheme's position.
scheme_begin_ = tok.token_begin();
scheme_end_ = tok.token_end();
params_begin_ = scheme_end_;
params_end_ = end;
HttpUtil::TrimLWS(¶ms_begin_, ¶ms_end_);
}
HttpUtil::NameValuePairsIterator HttpAuth::ChallengeTokenizer::param_pairs()
const {
return HttpUtil::NameValuePairsIterator(params_begin_, params_end_, ',');
}
std::string HttpAuth::ChallengeTokenizer::base64_param() const {
// Strip off any padding.
// (See https://bugzilla.mozilla.org/show_bug.cgi?id=230351.)
//
// Our base64 decoder requires that the length be a multiple of 4.
int encoded_length = params_end_ - params_begin_;
while (encoded_length > 0 && encoded_length % 4 != 0 &&
params_begin_[encoded_length - 1] == '=') {
--encoded_length;
}
return std::string(params_begin_, params_begin_ + encoded_length);
}
// static
std::string HttpAuth::GetChallengeHeaderName(Target target) {
switch (target) {
case AUTH_PROXY:
return "Proxy-Authenticate";
case AUTH_SERVER:
return "WWW-Authenticate";
default:
NOTREACHED();
return "";
}
}
// static
std::string HttpAuth::GetAuthorizationHeaderName(Target target) {
switch (target) {
case AUTH_PROXY:
return "Proxy-Authorization";
case AUTH_SERVER:
return "Authorization";
default:
NOTREACHED();
return "";
}
}
// static
std::string HttpAuth::GetAuthTargetString(
HttpAuth::Target target) {
return target == HttpAuth::AUTH_PROXY ? "proxy" : "server";
}
} // namespace net
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