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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40284755): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif
#include "net/ntlm/ntlm_buffer_writer.h"
#include <string.h>
#include <limits>
#include "base/check_op.h"
#include "base/strings/utf_string_conversions.h"
#include "build/build_config.h"
namespace net::ntlm {
NtlmBufferWriter::NtlmBufferWriter(size_t buffer_len)
: buffer_(buffer_len, 0) {}
NtlmBufferWriter::~NtlmBufferWriter() = default;
bool NtlmBufferWriter::CanWrite(size_t len) const {
if (len == 0)
return true;
if (!GetBufferPtr())
return false;
DCHECK_LE(GetCursor(), GetLength());
return (len <= GetLength()) && (GetCursor() <= GetLength() - len);
}
bool NtlmBufferWriter::WriteUInt16(uint16_t value) {
return WriteUInt<uint16_t>(value);
}
bool NtlmBufferWriter::WriteUInt32(uint32_t value) {
return WriteUInt<uint32_t>(value);
}
bool NtlmBufferWriter::WriteUInt64(uint64_t value) {
return WriteUInt<uint64_t>(value);
}
bool NtlmBufferWriter::WriteFlags(NegotiateFlags flags) {
return WriteUInt32(static_cast<uint32_t>(flags));
}
bool NtlmBufferWriter::WriteBytes(base::span<const uint8_t> bytes) {
if (bytes.size() == 0)
return true;
if (!CanWrite(bytes.size()))
return false;
memcpy(GetBufferPtrAtCursor(), bytes.data(), bytes.size());
AdvanceCursor(bytes.size());
return true;
}
bool NtlmBufferWriter::WriteZeros(size_t count) {
if (count == 0)
return true;
if (!CanWrite(count))
return false;
memset(GetBufferPtrAtCursor(), 0, count);
AdvanceCursor(count);
return true;
}
bool NtlmBufferWriter::WriteSecurityBuffer(SecurityBuffer sec_buf) {
return WriteUInt16(sec_buf.length) && WriteUInt16(sec_buf.length) &&
WriteUInt32(sec_buf.offset);
}
bool NtlmBufferWriter::WriteAvPairHeader(TargetInfoAvId avid, uint16_t avlen) {
if (!CanWrite(kAvPairHeaderLen))
return false;
bool result = WriteUInt16(static_cast<uint16_t>(avid)) && WriteUInt16(avlen);
DCHECK(result);
return result;
}
bool NtlmBufferWriter::WriteAvPairTerminator() {
return WriteAvPairHeader(TargetInfoAvId::kEol, 0);
}
bool NtlmBufferWriter::WriteAvPair(const AvPair& pair) {
if (!WriteAvPairHeader(pair))
return false;
if (pair.avid == TargetInfoAvId::kFlags) {
if (pair.avlen != sizeof(uint32_t))
return false;
return WriteUInt32(static_cast<uint32_t>(pair.flags));
} else {
return WriteBytes(pair.buffer);
}
}
bool NtlmBufferWriter::WriteUtf8String(const std::string& str) {
return WriteBytes(base::as_byte_span(str));
}
bool NtlmBufferWriter::WriteUtf16AsUtf8String(const std::u16string& str) {
std::string utf8 = base::UTF16ToUTF8(str);
return WriteUtf8String(utf8);
}
bool NtlmBufferWriter::WriteUtf8AsUtf16String(const std::string& str) {
std::u16string unicode = base::UTF8ToUTF16(str);
return WriteUtf16String(unicode);
}
bool NtlmBufferWriter::WriteUtf16String(const std::u16string& str) {
if (str.size() > std::numeric_limits<size_t>::max() / 2)
return false;
size_t num_bytes = str.size() * 2;
if (num_bytes == 0)
return true;
if (!CanWrite(num_bytes))
return false;
#if defined(ARCH_CPU_BIG_ENDIAN)
uint8_t* ptr = reinterpret_cast<uint8_t*>(GetBufferPtrAtCursor());
for (int i = 0; i < num_bytes; i += 2) {
ptr[i] = str[i / 2] & 0xff;
ptr[i + 1] = str[i / 2] >> 8;
}
#else
memcpy(reinterpret_cast<void*>(GetBufferPtrAtCursor()), str.c_str(),
num_bytes);
#endif
AdvanceCursor(num_bytes);
return true;
}
bool NtlmBufferWriter::WriteSignature() {
return WriteBytes(kSignature);
}
bool NtlmBufferWriter::WriteMessageType(MessageType message_type) {
return WriteUInt32(static_cast<uint32_t>(message_type));
}
bool NtlmBufferWriter::WriteMessageHeader(MessageType message_type) {
return WriteSignature() && WriteMessageType(message_type);
}
template <typename T>
bool NtlmBufferWriter::WriteUInt(T value) {
size_t int_size = sizeof(T);
if (!CanWrite(int_size))
return false;
for (size_t i = 0; i < int_size; i++) {
GetBufferPtrAtCursor()[i] = static_cast<uint8_t>(value & 0xff);
value >>= 8;
}
AdvanceCursor(int_size);
return true;
}
void NtlmBufferWriter::SetCursor(size_t cursor) {
DCHECK(GetBufferPtr() && cursor <= GetLength());
cursor_ = cursor;
}
} // namespace net::ntlm
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