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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 {
// 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);
// A connection-based authentication scheme must continue to use the
// existing handler object in |*handler|.
if (handler->get() && (*handler)->is_connection_based() &&
(disabled_schemes.find((*handler)->scheme()) == disabled_schemes.end())) {
const std::string header_name = GetChallengeHeaderName(target);
std::string challenge;
void* iter = NULL;
while (headers->EnumerateHeader(&iter, header_name, &challenge)) {
ChallengeTokenizer props(challenge.begin(), challenge.end());
if (LowerCaseEqualsASCII(props.scheme(), (*handler)->scheme().c_str()) &&
(*handler)->InitFromChallenge(&props, target, origin, net_log))
return;
}
}
// 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) {
LOG(WARNING) << "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);
}
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()) {
valid_ = false;
return;
}
// Save the scheme's position.
scheme_begin_ = tok.token_begin();
scheme_end_ = tok.token_end();
// Everything past scheme_end_ is a (comma separated) value list.
props_ = HttpUtil::ValuesIterator(scheme_end_, end, ',');
}
// We expect properties to be formatted as one of:
// name="value"
// name=value
// name=
// Due to buggy implementations found in some embedded devices, we also
// accept values with missing close quotemark (http://crbug.com/39836):
// name="value
bool HttpAuth::ChallengeTokenizer::GetNext() {
if (!props_.GetNext())
return false;
// Set the value as everything. Next we will split out the name.
value_begin_ = props_.value_begin();
value_end_ = props_.value_end();
name_begin_ = name_end_ = value_end_;
if (expect_base64_token_) {
expect_base64_token_ = false;
// 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 = value_end_ - value_begin_;
while (encoded_length > 0 && encoded_length % 4 != 0 &&
value_begin_[encoded_length - 1] == '=') {
--encoded_length;
--value_end_;
}
return true;
}
// Scan for the equals sign.
std::string::const_iterator equals = std::find(value_begin_, value_end_, '=');
if (equals == value_end_ || equals == value_begin_)
return valid_ = false; // Malformed
// Verify that the equals sign we found wasn't inside of quote marks.
for (std::string::const_iterator it = value_begin_; it != equals; ++it) {
if (HttpUtil::IsQuote(*it))
return valid_ = false; // Malformed
}
name_begin_ = value_begin_;
name_end_ = equals;
value_begin_ = equals + 1;
value_is_quoted_ = false;
if (value_begin_ != value_end_ && HttpUtil::IsQuote(*value_begin_)) {
// Trim surrounding quotemarks off the value
if (*value_begin_ != *(value_end_ - 1) || value_begin_ + 1 == value_end_)
value_begin_ = equals + 2; // Gracefully recover from mismatching quotes.
else
value_is_quoted_ = true;
}
return true;
}
// If value() has quotemarks, unquote it.
std::string HttpAuth::ChallengeTokenizer::unquoted_value() const {
return HttpUtil::Unquote(value_begin_, value_end_);
}
// 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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