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// Copyright 2019 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/http/http_auth_ntlm_mechanism.h"
#include <string_view>
#include "base/base64.h"
#include "base/containers/span.h"
#include "base/logging.h"
#include "base/rand_util.h"
#include "base/time/time.h"
#include "net/base/net_errors.h"
#include "net/base/network_interfaces.h"
#include "net/http/http_auth_challenge_tokenizer.h"
#include "net/http/http_auth_multi_round_parse.h"
#include "net/http/http_auth_preferences.h"
#include "net/http/http_auth_scheme.h"
namespace net {
namespace {
uint64_t GetMSTime() {
return base::Time::Now().since_origin().InMicroseconds() * 10;
}
void GenerateRandom(base::span<uint8_t> output) {
base::RandBytes(output);
}
// static
HttpAuthNtlmMechanism::GetMSTimeProc g_get_ms_time_proc = GetMSTime;
// static
HttpAuthNtlmMechanism::GenerateRandomProc g_generate_random_proc =
GenerateRandom;
// static
HttpAuthNtlmMechanism::HostNameProc g_host_name_proc = GetHostName;
template <typename T>
T SwapOut(T* target, T source) {
T t = *target;
*target = source;
return t;
}
int SetAuthTokenFromBinaryToken(std::string* auth_token,
const std::vector<uint8_t>& next_token) {
if (next_token.empty())
return ERR_UNEXPECTED;
std::string encode_output = base::Base64Encode(std::string_view(
reinterpret_cast<const char*>(next_token.data()), next_token.size()));
*auth_token = std::string("NTLM ") + encode_output;
return OK;
}
} // namespace
HttpAuthNtlmMechanism::ScopedProcSetter::ScopedProcSetter(
GetMSTimeProc ms_time_proc,
GenerateRandomProc random_proc,
HostNameProc host_name_proc) {
old_ms_time_proc_ = SwapOut(&g_get_ms_time_proc, ms_time_proc);
old_random_proc_ = SwapOut(&g_generate_random_proc, random_proc);
old_host_name_proc_ = SwapOut(&g_host_name_proc, host_name_proc);
}
HttpAuthNtlmMechanism::ScopedProcSetter::~ScopedProcSetter() {
g_get_ms_time_proc = old_ms_time_proc_;
g_generate_random_proc = old_random_proc_;
g_host_name_proc = old_host_name_proc_;
}
HttpAuthNtlmMechanism::HttpAuthNtlmMechanism(
const HttpAuthPreferences* http_auth_preferences)
: ntlm_client_(ntlm::NtlmFeatures(
http_auth_preferences ? http_auth_preferences->NtlmV2Enabled()
: true)) {}
HttpAuthNtlmMechanism::~HttpAuthNtlmMechanism() = default;
bool HttpAuthNtlmMechanism::Init(const NetLogWithSource& net_log) {
return true;
}
bool HttpAuthNtlmMechanism::NeedsIdentity() const {
// This gets called for each round-trip. Only require identity on the first
// call (when challenge_token_ is empty). On subsequent calls, we use the
// initially established identity.
return challenge_token_.empty();
}
bool HttpAuthNtlmMechanism::AllowsExplicitCredentials() const {
return true;
}
HttpAuth::AuthorizationResult HttpAuthNtlmMechanism::ParseChallenge(
HttpAuthChallengeTokenizer* tok) {
if (!first_token_sent_)
return ParseFirstRoundChallenge(HttpAuth::Scheme::AUTH_SCHEME_NTLM, tok);
challenge_token_.clear();
std::string encoded_token;
return ParseLaterRoundChallenge(HttpAuth::Scheme::AUTH_SCHEME_NTLM, tok,
&encoded_token, &challenge_token_);
}
int HttpAuthNtlmMechanism::GenerateAuthToken(
const AuthCredentials* credentials,
const std::string& spn,
const std::string& channel_bindings,
std::string* auth_token,
const NetLogWithSource& net_log,
CompletionOnceCallback callback) {
if (!credentials) {
LOG(ERROR) << "Username and password are expected to be non-nullptr.";
return ERR_MISSING_AUTH_CREDENTIALS;
}
if (challenge_token_.empty()) {
if (first_token_sent_)
return ERR_UNEXPECTED;
first_token_sent_ = true;
return SetAuthTokenFromBinaryToken(auth_token,
ntlm_client_.GetNegotiateMessage());
}
// The username may be in the form "DOMAIN\user". Parse it into the two
// components.
std::u16string domain;
std::u16string user;
const std::u16string& username = credentials->username();
const char16_t backslash_character = '\\';
size_t backslash_idx = username.find(backslash_character);
if (backslash_idx == std::u16string::npos) {
user = username;
} else {
domain = username.substr(0, backslash_idx);
user = username.substr(backslash_idx + 1);
}
std::string hostname = g_host_name_proc();
if (hostname.empty())
return ERR_UNEXPECTED;
uint8_t client_challenge[8];
g_generate_random_proc(base::span<uint8_t>(client_challenge));
auto next_token = ntlm_client_.GenerateAuthenticateMessage(
domain, user, credentials->password(), hostname, channel_bindings, spn,
g_get_ms_time_proc(), client_challenge,
base::as_byte_span(challenge_token_));
return SetAuthTokenFromBinaryToken(auth_token, next_token);
}
void HttpAuthNtlmMechanism::SetDelegation(
HttpAuth::DelegationType delegation_type) {
// Nothing to do.
}
} // namespace net
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