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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/device_bound_sessions/registration_fetcher_param.h"
#include <vector>
#include "base/base64url.h"
#include "base/logging.h"
#include "base/strings/escape.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "net/base/schemeful_site.h"
#include "net/device_bound_sessions/session_binding_utils.h"
#include "net/http/structured_headers.h"
namespace {
// TODO(kristianm): See if these can be used with
// services/network/sec_header_helpers.cc
constexpr char kRegistrationHeaderName[] = "Sec-Session-Registration";
constexpr char kChallengeParamKey[] = "challenge";
constexpr char kPathParamKey[] = "path";
constexpr char kAuthCodeParamKey[] = "authorization";
constexpr char kES256[] = "ES256";
constexpr char kRS256[] = "RS256";
std::optional<crypto::SignatureVerifier::SignatureAlgorithm> AlgoFromString(
const std::string_view& algo) {
if (algo == kES256) {
return crypto::SignatureVerifier::SignatureAlgorithm::ECDSA_SHA256;
}
if (algo == kRS256) {
return crypto::SignatureVerifier::SignatureAlgorithm::RSA_PKCS1_SHA256;
}
return std::nullopt;
}
} // namespace
namespace net::device_bound_sessions {
RegistrationFetcherParam::RegistrationFetcherParam(
RegistrationFetcherParam&& other) = default;
RegistrationFetcherParam& RegistrationFetcherParam::operator=(
RegistrationFetcherParam&& other) noexcept = default;
RegistrationFetcherParam::~RegistrationFetcherParam() = default;
RegistrationFetcherParam::RegistrationFetcherParam(
GURL registration_endpoint,
std::vector<crypto::SignatureVerifier::SignatureAlgorithm> supported_algos,
std::string challenge,
std::optional<std::string> authorization)
: registration_endpoint_(std::move(registration_endpoint)),
supported_algos_(std::move(supported_algos)),
challenge_(std::move(challenge)),
authorization_(std::move(authorization)) {}
std::optional<RegistrationFetcherParam> RegistrationFetcherParam::ParseItem(
const GURL& request_url,
const structured_headers::ParameterizedMember& session_registration) {
std::vector<crypto::SignatureVerifier::SignatureAlgorithm> supported_algos;
for (const auto& algo_token : session_registration.member) {
if (algo_token.item.is_token()) {
std::optional<crypto::SignatureVerifier::SignatureAlgorithm> algo =
AlgoFromString(algo_token.item.GetString());
if (algo) {
supported_algos.push_back(*algo);
};
}
}
if (supported_algos.empty()) {
return std::nullopt;
}
GURL registration_endpoint;
std::string challenge;
std::optional<std::string> authorization;
for (const auto& [key, value] : session_registration.params) {
// The keys for the parameters are unique and must be lower case.
// Quiche (https://quiche.googlesource.com/quiche), used here,
// will currently pick the last if there is more than one.
if (key == kPathParamKey) {
if (!value.is_string()) {
continue;
}
// TODO(kristianm): Update this as same site requirements are solidified
std::string unescaped_path = base::UnescapeURLComponent(
value.GetString(),
base::UnescapeRule::PATH_SEPARATORS |
base::UnescapeRule::URL_SPECIAL_CHARS_EXCEPT_PATH_SEPARATORS);
// Registration endpoint can be a full URL (samesite with request origin)
// or a relative URL, starting with a "/" to make it origin-relative,
// and starting with anything else making it current-path-relative to
// request URL.
GURL candidate_registration_endpoint =
request_url.Resolve(unescaped_path);
if (candidate_registration_endpoint.is_valid() &&
IsSecure(candidate_registration_endpoint) &&
net::SchemefulSite::IsSameSite(candidate_registration_endpoint,
request_url)) {
registration_endpoint = std::move(candidate_registration_endpoint);
}
} else if (key == kChallengeParamKey && value.is_string()) {
challenge = value.GetString();
} else if (key == kAuthCodeParamKey && value.is_string()) {
authorization = value.GetString();
}
// Other params are ignored
}
if (!registration_endpoint.is_valid() || challenge.empty()) {
return std::nullopt;
}
return RegistrationFetcherParam(
std::move(registration_endpoint), std::move(supported_algos),
std::move(challenge), std::move(authorization));
}
std::vector<RegistrationFetcherParam> RegistrationFetcherParam::CreateIfValid(
const GURL& request_url,
const net::HttpResponseHeaders* headers) {
std::vector<RegistrationFetcherParam> params;
if (!request_url.is_valid()) {
return params;
}
if (!headers) {
return params;
}
std::optional<std::string> header_value =
headers->GetNormalizedHeader(kRegistrationHeaderName);
if (!header_value) {
return params;
}
std::optional<structured_headers::List> list =
structured_headers::ParseList(*header_value);
if (!list || list->empty()) {
return params;
}
for (const auto& item : *list) {
if (item.member_is_inner_list) {
std::optional<RegistrationFetcherParam> fetcher_param =
ParseItem(request_url, item);
if (fetcher_param) {
params.push_back(std::move(*fetcher_param));
}
}
}
return params;
}
// static
RegistrationFetcherParam RegistrationFetcherParam::CreateInstanceForTesting(
GURL registration_endpoint,
std::vector<crypto::SignatureVerifier::SignatureAlgorithm> supported_algos,
std::string challenge,
std::optional<std::string> authorization) {
return RegistrationFetcherParam(
std::move(registration_endpoint), std::move(supported_algos),
std::move(challenge), std::move(authorization));
}
} // namespace net::device_bound_sessions
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