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occheung 2020-10-04 22:22:29 +08:00
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.gitignore vendored Normal file
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/target

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.idea/codeStyles/Project.xml Normal file
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name = "proc-macro2"
version = "1.0.24"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
dependencies = [
"unicode-xid",
]
[[package]]
name = "quote"
version = "1.0.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
dependencies = [
"proc-macro2",
]
[[package]]
name = "rand"
version = "0.7.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
dependencies = [
"getrandom",
"rand_chacha",
"rand_core",
"rand_hc",
]
[[package]]
name = "rand_chacha"
version = "0.2.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
dependencies = [
"ppv-lite86",
"rand_core",
]
[[package]]
name = "rand_core"
version = "0.5.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
dependencies = [
"getrandom",
]
[[package]]
name = "rand_hc"
version = "0.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
dependencies = [
"rand_core",
]
[[package]]
name = "serde"
version = "1.0.116"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "96fe57af81d28386a513cbc6858332abc6117cfdb5999647c6444b8f43a370a5"
[[package]]
name = "smoltcp"
version = "0.6.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0fe46639fd2ec79eadf8fe719f237a7a0bd4dac5d957f1ca5bbdbc1c3c39e53a"
dependencies = [
"bitflags",
"byteorder",
"managed",
]
[[package]]
name = "smoltcp-tls"
version = "0.1.0"
dependencies = [
"aes-gcm",
"byteorder",
"chacha20poly1305",
"heapless",
"num_enum",
"rand",
"rand_chacha",
"smoltcp",
]
[[package]]
name = "stable_deref_trait"
version = "1.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
[[package]]
name = "stream-cipher"
version = "0.7.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c80e15f898d8d8f25db24c253ea615cc14acf418ff307822995814e7d42cfa89"
dependencies = [
"block-cipher",
"generic-array 0.14.4",
]
[[package]]
name = "subtle"
version = "2.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "343f3f510c2915908f155e94f17220b19ccfacf2a64a2a5d8004f2c3e311e7fd"
[[package]]
name = "syn"
version = "1.0.42"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9c51d92969d209b54a98397e1b91c8ae82d8c87a7bb87df0b29aa2ad81454228"
dependencies = [
"proc-macro2",
"quote",
"unicode-xid",
]
[[package]]
name = "toml"
version = "0.5.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ffc92d160b1eef40665be3a05630d003936a3bc7da7421277846c2613e92c71a"
dependencies = [
"serde",
]
[[package]]
name = "typenum"
version = "1.12.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "373c8a200f9e67a0c95e62a4f52fbf80c23b4381c05a17845531982fa99e6b33"
[[package]]
name = "unicode-xid"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
[[package]]
name = "universal-hash"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8326b2c654932e3e4f9196e69d08fdf7cfd718e1dc6f66b347e6024a0c961402"
dependencies = [
"generic-array 0.14.4",
"subtle",
]
[[package]]
name = "version_check"
version = "0.9.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
[[package]]
name = "wasi"
version = "0.9.0+wasi-snapshot-preview1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
[[package]]
name = "zeroize"
version = "1.1.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "05f33972566adbd2d3588b0491eb94b98b43695c4ef897903470ede4f3f5a28a"

33
Cargo.toml Normal file
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@ -0,0 +1,33 @@
[package]
name = "smoltcp-tls"
version = "0.1.0"
authors = ["occheung <occheung@connect.ust.hk>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
aes-gcm = "0.7.0"
chacha20poly1305 = "0.6.0"
byteorder = "1.3.4"
num_enum = "0.5.1"
[dependencies.smoltcp]
version = "0.6.0"
default-features = false
features = ["proto-ipv4", "proto-ipv6", "socket-tcp"]
[dependencies.rand_chacha]
version = "0.2.2"
default-features = false
features = []
[dependencies.rand]
version = "0.7.3"
default-features = false
features = ["getrandom"]
[dependencies.heapless]
version = "0.5.6"
default-features = false
features = []

0
README.md Normal file
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4
src/lib.rs Normal file
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@ -0,0 +1,4 @@
#![no_std]
pub mod tls;
pub mod tls_packet;

30
src/main.rs Normal file
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@ -0,0 +1,30 @@
use smoltcp_tls::tls::TlsSocket;
use smoltcp::socket::TcpSocketBuffer;
use smoltcp::socket::SocketSet;
use smoltcp::wire::Ipv4Address;
fn main() {
let mut socket_set_entries: [_; 8] = Default::default();
let mut sockets = SocketSet::new(&mut socket_set_entries[..]);
let mut tx_storage = [0; 4096];
let mut rx_storage = [0; 4096];
let mut tls_socket = {
let tx_buffer = TcpSocketBuffer::new(&mut tx_storage[..]);
let rx_buffer = TcpSocketBuffer::new(&mut rx_storage[..]);
TlsSocket::new(
&mut sockets,
rx_buffer,
tx_buffer
)
};
tls_socket.tcp_connect(
&mut sockets,
(Ipv4Address::new(192, 168, 1, 125), 1883),
49600
).unwrap();
tls_socket.tls_connect(&mut sockets).unwrap();
}

449
src/tls.rs Normal file
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@ -0,0 +1,449 @@
use smoltcp::socket::TcpSocket;
use smoltcp::socket::TcpState;
use smoltcp::socket::Socket;
use smoltcp::socket::AnySocket;
use smoltcp::socket::SocketRef;
use smoltcp::socket::SocketHandle;
use smoltcp::socket::SocketSet;
use smoltcp::socket::TcpSocketBuffer;
use smoltcp::wire::Ipv4Address;
use smoltcp::wire::IpEndpoint;
use smoltcp::Result;
use smoltcp::Error;
use byteorder::{ByteOrder, NetworkEndian, BigEndian, WriteBytesExt};
use rand::prelude::*;
use rand_chacha::ChaCha20Rng;
use heapless::Vec;
use heapless::consts::*;
use core::convert::TryInto;
use core::convert::TryFrom;
use crate::tls_packet::*;
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
#[allow(non_camel_case_types)]
enum TlsState {
START,
WAIT_SH,
WAIT_EE,
WAIT_CERT_CR,
WAIT_CERT,
WAIT_CV,
WAIT_FINISHED,
CONNECTED,
}
pub struct TlsSocket
{
state: TlsState,
tcp_handle: SocketHandle,
random: ChaCha20Rng,
}
impl TlsSocket {
pub fn new<'a, 'b, 'c>(
sockets: &mut SocketSet<'a, 'b, 'c>,
rx_buffer: TcpSocketBuffer<'b>,
tx_buffer: TcpSocketBuffer<'b>,
) -> Self
where
'b: 'c,
{
let tcp_socket = TcpSocket::new(rx_buffer, tx_buffer);
let tcp_handle = sockets.add(tcp_socket);
TlsSocket {
state: TlsState::START,
tcp_handle,
random: ChaCha20Rng::from_entropy(),
}
}
pub fn tcp_connect<T, U>(
&mut self,
sockets: &mut SocketSet,
remote_endpoint: T,
local_endpoint: U,
) -> Result<()>
where
T: Into<IpEndpoint>,
U: Into<IpEndpoint>,
{
let mut tcp_socket = sockets.get::<TcpSocket>(self.tcp_handle);
tcp_socket.connect(remote_endpoint, local_endpoint)
}
pub fn tls_connect(&mut self, sockets: &mut SocketSet) -> Result<bool> {
// Check tcp_socket connectivity
{
let tcp_socket = sockets.get::<TcpSocket>(self.tcp_handle);
if tcp_socket.state() != TcpState::Established {
return Ok(false);
}
}
if self.state == TlsState::START {
// Create TLS representation, length and payload not finalised
let mut random: [u8; 32] = [0; 32];
let mut session_id: [u8; 32] = [0; 32];
self.random.fill_bytes(&mut random);
self.random.fill_bytes(&mut session_id);
let cipher_suites_length = 3;
let cipher_suites = [
CipherSuite::TLS_AES_128_GCM_SHA256,
CipherSuite::TLS_AES_256_GCM_SHA384,
CipherSuite::TLS_CHACHA20_POLY1305_SHA256,
];
// Length: to be determined
let supported_versions_extension = Extension {
extension_type: ExtensionType::SupportedVersions,
length: 3,
extension_data: &[
2, // Number of supported versions * 2
// Need 2 bytes to contain a version
0x03, 0x04 // 0x0303: TLS Version 1.3
]
};
let client_hello = ClientHello {
version: TlsVersion::Tls12,
random,
session_id_length: 32,
session_id,
cipher_suites_length,
cipher_suites: &cipher_suites,
compression_method_length: 1,
compression_methods: 0,
extension_length: supported_versions_extension.get_length(),
extensions: &[supported_versions_extension],
};
let handshake_repr = HandshakeRepr {
msg_type: HandshakeType::ClientHello,
length: client_hello.get_length(),
handshake_data: HandshakeData::ClientHello(client_hello),
};
let repr = TlsRepr {
content_type: TlsContentType::Handshake,
version: TlsVersion::Tls13,
length: 0,
payload: None,
handshake: Some(handshake_repr),
};
self.send_tls_repr(sockets, repr)?;
self.state = TlsState::WAIT_SH;
Ok(true)
} else if self.state == TlsState::WAIT_SH {
Ok(true)
} else {
Ok(true)
}
}
// Generic inner send method, through TCP socket
fn send_tls_repr(&mut self, sockets: &mut SocketSet, tls_repr: TlsRepr) -> Result<()> {
let mut tcp_socket = sockets.get::<TcpSocket>(self.tcp_handle);
let mut array = [0; 2048];
let mut buffer = TlsBuffer::new(&mut array);
buffer.enqueue_tls_repr(tls_repr)?;
let buffer_size = buffer.index.clone();
tcp_socket.send_slice(buffer.into())
.and_then(
|size| if size == buffer_size.into_inner() {
Ok(())
} else {
Err(Error::Truncated)
}
)
}
// Generic inner recv method, through TCP socket
fn recv_tls_repr<'a>(&'a mut self, sockets: &mut SocketSet, byte_array: &'a mut [u8]) -> Result<TlsRepr<'a, '_>> {
let mut tcp_socket = sockets.get::<TcpSocket>(self.tcp_handle);
let size = tcp_socket.recv_slice(byte_array)?;
let buffer = TlsBuffer::new(&mut byte_array[..size]);
buffer.dequeue_tls_repr()
}
}
// Only designed to support read or write the entire buffer
pub(crate) struct TlsBuffer<'a> {
buffer: &'a mut [u8],
index: core::cell::RefCell<usize>,
}
impl<'a> Into<&'a [u8]> for TlsBuffer<'a> {
fn into(self) -> &'a [u8] {
&self.buffer[0..self.index.into_inner()]
}
}
impl<'a> TlsBuffer<'a> {
pub(crate) fn new(buffer: &'a mut [u8]) -> Self {
Self {
buffer,
index: core::cell::RefCell::new(0),
}
}
pub(crate) fn write(&mut self, data: &[u8]) -> Result<()> {
let mut index = self.index.borrow_mut();
if (self.buffer.len() - *index) < data.len() {
return Err(Error::Exhausted);
}
let next_index = *index + data.len();
self.buffer[*index..next_index].copy_from_slice(data);
*index = next_index;
Ok(())
}
pub(crate) fn write_u8(&mut self, data: u8) -> Result<()> {
let mut index = self.index.borrow_mut();
if (self.buffer.len() - *index) < 1 {
return Err(Error::Exhausted);
}
self.buffer[*index] = data;
*index += 1;
Ok(())
}
pub(crate) fn read_u8(&mut self) -> Result<u8> {
let mut index = self.index.borrow_mut();
if (self.buffer.len() - *index) < 1 {
return Err(Error::Exhausted);
}
let data = self.buffer[*index];
*index += 1;
Ok(data)
}
pub(crate) fn read_all(self) -> &'a [u8] {
&self.buffer[self.index.into_inner()..]
}
pub(crate) fn read_slice(&self, length: usize) -> Result<&[u8]> {
let mut index = self.index.borrow_mut();
if (self.buffer.len() - *index) < length {
return Err(Error::Exhausted);
}
let next_index = *index + length;
let slice = &self.buffer[*index..next_index];
*index = next_index;
Ok(slice)
}
fn enqueue_tls_repr(&mut self, tls_repr: TlsRepr) -> Result<()> {
self.write_u8(tls_repr.content_type.into())?;
self.write_u16(tls_repr.version.into())?;
self.write_u16(tls_repr.length)?;
if let Some(app_data) = tls_repr.payload {
self.write(app_data)?;
} else if let Some(handshake_repr) = tls_repr.handshake {
// Queue handshake_repr into buffer
self.enqueue_handshake_repr(handshake_repr)?;
} else {
return Err(Error::Malformed);
}
Ok(())
}
fn enqueue_handshake_repr(&mut self, handshake_repr: HandshakeRepr) -> Result<()> {
self.write_u8(handshake_repr.msg_type.into())?;
self.write_u24(handshake_repr.length)?;
self.enqueue_handshake_data(handshake_repr.handshake_data)
}
fn enqueue_handshake_data(&mut self, handshake_data: HandshakeData) -> Result<()> {
match handshake_data {
HandshakeData::ClientHello(client_hello) => {
self.enqueue_client_hello(client_hello)
}
_ => {
Err(Error::Unrecognized)
}
}
}
fn enqueue_client_hello(&mut self, client_hello: ClientHello) -> Result<()> {
self.write_u16(client_hello.version.into())?;
self.write(&client_hello.random)?;
self.write_u8(client_hello.session_id_length)?;
self.write(&client_hello.session_id)?;
self.write_u16(client_hello.cipher_suites_length)?;
for suite in client_hello.cipher_suites.iter() {
self.write_u16((*suite).into())?;
}
self.write_u8(client_hello.compression_method_length)?;
self.write_u8(client_hello.compression_methods)?;
self.write_u16(client_hello.extension_length)?;
self.enqueue_extensions(client_hello.extensions)
}
fn enqueue_extensions(&mut self, extensions: &[Extension]) -> Result<()> {
for extension in extensions {
self.write_u16(extension.extension_type.into())?;
self.write_u16(extension.length)?;
self.write(extension.extension_data)?;
}
Ok(())
}
fn dequeue_tls_repr<'b>(mut self) -> Result<TlsRepr<'a, 'b>> {
// Create a TLS Representation layer
// Modify the representation along the way
let mut repr = TlsRepr {
content_type: TlsContentType::Invalid,
version: TlsVersion::Tls10,
length: 0,
payload: None,
handshake: None,
};
repr.content_type = TlsContentType::try_from(self.read_u8()?)
.map_err(|_| Error::Unrecognized)?;
repr.version = TlsVersion::try_from(self.read_u16()?)
.map_err(|_| Error::Unrecognized)?;
repr.length = self.read_u16()?;
use TlsContentType::*;
match repr.content_type {
Invalid => Err(Error::Unrecognized),
ChangeCipherSpec | Alert => unimplemented!(),
Handshake => todo!(),
ApplicationData => {
repr.payload = Some(self.read_all());
Ok(repr)
}
}
}
fn dequeue_handshake<'b>(mut self) -> Result<HandshakeRepr<'a, 'b>> {
// Create a Handshake header representation
// Fill in proper value afterwards
let mut repr = HandshakeRepr {
msg_type: HandshakeType::ClientHello,
length: 0,
handshake_data: HandshakeData::Uninitialized,
};
repr.msg_type = HandshakeType::try_from(self.read_u8()?)
.map_err(|_| Error::Unrecognized)?;
repr.length = self.read_u24()?;
use HandshakeType::*;
match repr.msg_type {
ClientHello => unimplemented!(),
ServerHello => todo!(),
_ => unimplemented!(),
}
}
fn dequeue_server_hello(mut self) -> Result<ServerHello<'static, 'static>> {
// Create a Server Hello representation
// Fill in proper value afterwards
let mut server_hello = ServerHello {
version: TlsVersion::Tls10,
random: [0; 32],
session_id_echo_length: 0,
session_id_echo: [0; 32],
cipher_suite: CipherSuite::TLS_CHACHA20_POLY1305_SHA256,
compression_method: 0,
extension_length: 0,
extensions: &[],
};
server_hello.version = TlsVersion::try_from(self.read_u16()?)
.map_err(|_| Error::Unrecognized)?;
for random_byte in &mut server_hello.random[..] {
*random_byte = self.read_u8()?;
}
server_hello.session_id_echo_length = self.read_u8()?;
for id_byte in &mut server_hello.session_id_echo[
..usize::try_from(server_hello.session_id_echo_length)
.map_err(|_| Error::Exhausted)?
] {
*id_byte = self.read_u8()?;
}
server_hello.cipher_suite = CipherSuite::try_from(self.read_u16()?)
.map_err(|_| Error::Unrecognized)?;
server_hello.compression_method = self.read_u8()?;
server_hello.extension_length = self.read_u16()?;
let mut remaining_length = server_hello.extension_length;
let mut extension_counter = 0;
let mut extension_vec: Vec<Extension, U32> = Vec::new();
while remaining_length != 0 {
extension_vec.push(self.dequeue_extension()?.clone())
.map_err(|_| Error::Exhausted)?;
// Deduct base length of an extension (ext_type, len)
remaining_length -= 4;
remaining_length -= extension_vec[extension_counter].length;
extension_counter += 1;
}
Ok(server_hello)
}
fn dequeue_extension(&self) -> Result<Extension<'_>> {
// Create an Extension representation
// Fill in proper value afterwards
let mut extension = Extension {
extension_type: ExtensionType::ServerName,
length: 0,
extension_data: &[],
};
extension.extension_type = ExtensionType::try_from(self.read_u16()?)
.map_err(|_| Error::Unrecognized)?;
extension.length = self.read_u16()?;
extension.extension_data = self.read_slice(
usize::try_from(extension.length)
.map_err(|_| Error::Exhausted)?
)?;
Ok(extension)
}
}
macro_rules! export_byte_order_fn {
($($write_fn_name: ident, $read_fn_name: ident, $data_type: ty, $data_size: literal),+) => {
impl<'a> TlsBuffer<'a> {
$(
pub(crate) fn $write_fn_name(&mut self, data: $data_type) -> Result<()> {
let mut index = self.index.borrow_mut();
if (self.buffer.len() - *index) < $data_size {
return Err(Error::Exhausted);
}
let next_index = *index + $data_size;
NetworkEndian::$write_fn_name(&mut self.buffer[*index..next_index], data);
*index = next_index;
Ok(())
}
pub(crate) fn $read_fn_name(&self) -> Result<$data_type> {
let mut index = self.index.borrow_mut();
if (self.buffer.len() - *index) < $data_size {
return Err(Error::Exhausted);
}
let next_index = *index + $data_size;
let data = NetworkEndian::$read_fn_name(&self.buffer[*index..next_index]);
*index = next_index;
Ok(data)
}
)+
}
}
}
export_byte_order_fn!(
write_u16, read_u16, u16, 2,
write_u24, read_u24, u32, 3,
write_u32, read_u32, u32, 4,
write_u48, read_u48, u64, 6,
write_u64, read_u64, u64, 8
);

162
src/tls_packet.rs Normal file
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@ -0,0 +1,162 @@
use byteorder::{ByteOrder, NetworkEndian, BigEndian};
use num_enum::IntoPrimitive;
use num_enum::TryFromPrimitive;
use core::convert::TryFrom;
#[derive(Debug, PartialEq, Eq, Clone, Copy, IntoPrimitive, TryFromPrimitive)]
#[repr(u8)]
pub(crate) enum TlsContentType {
Invalid = 0,
ChangeCipherSpec = 20,
Alert = 21,
Handshake = 22,
ApplicationData = 23
}
#[derive(Debug, PartialEq, Eq, Clone, Copy, IntoPrimitive, TryFromPrimitive)]
#[repr(u16)]
pub(crate) enum TlsVersion {
Tls10 = 0x0301,
Tls11 = 0x0302,
Tls12 = 0x0303,
Tls13 = 0x0304,
}
#[derive(Clone, Copy)]
pub(crate) struct TlsRepr<'a, 'b> {
pub(crate) content_type: TlsContentType,
pub(crate) version: TlsVersion,
pub(crate) length: u16,
pub(crate) payload: Option<&'a[u8]>,
pub(crate) handshake: Option<HandshakeRepr<'a, 'b>>
}
#[derive(Debug, PartialEq, Eq, Clone, Copy, IntoPrimitive, TryFromPrimitive)]
#[repr(u8)]
pub(crate) enum HandshakeType {
ClientHello = 1,
ServerHello = 2,
NewSessionTicket = 4,
EndOfEarlyData = 5,
EncryptedExtensions = 8,
Certificate = 11,
CertificateRequest = 13,
CertificateVerify = 15,
Finished = 20,
KeyUpdate = 24,
MessageHash = 254,
}
#[derive(Clone, Copy)]
pub(crate) struct HandshakeRepr<'a, 'b> {
pub(crate) msg_type: HandshakeType,
pub(crate) length: u32,
pub(crate) handshake_data: HandshakeData<'a, 'b>,
}
#[derive(Debug, PartialEq, Eq, Clone, Copy, IntoPrimitive, TryFromPrimitive)]
#[repr(u16)]
pub(crate) enum CipherSuite {
TLS_AES_128_GCM_SHA256 = 0x1301,
TLS_AES_256_GCM_SHA384 = 0x1302,
TLS_CHACHA20_POLY1305_SHA256 = 0x1303,
TLS_AES_128_CCM_SHA256 = 0x1304,
TLS_AES_128_CCM_8_SHA256 = 0x1305,
}
#[derive(Clone, Copy)]
pub(crate) struct ClientHello<'a, 'b> {
pub(crate) version: TlsVersion, // Legacy: Must be Tls12 (0x0303)
pub(crate) random: [u8; 32],
pub(crate) session_id_length: u8, // Legacy: Keep it 32
pub(crate) session_id: [u8; 32], // Legacy: Fill this with an unpredictable value
pub(crate) cipher_suites_length: u16,
pub(crate) cipher_suites: &'a[CipherSuite],
pub(crate) compression_method_length: u8, // Legacy: Must be 1, to contain a byte
pub(crate) compression_methods: u8, // Legacy: Must be 1 byte of 0
pub(crate) extension_length: u16,
pub(crate) extensions: &'a[Extension<'b>],
}
#[derive(Clone, Copy)]
pub(crate) enum HandshakeData<'a, 'b> {
Uninitialized,
ClientHello(ClientHello<'a, 'b>),
ServerHello(ServerHello<'a, 'b>),
}
impl<'a, 'b> ClientHello<'a, 'b> {
pub(crate) fn get_length(&self) -> u32 {
let mut length :u32 = 2; // TlsVersion size
length += 32; // Random size
length += 1; // Legacy session_id length size
length += 32; // Legacy session_id size
length += 2; // Cipher_suites_length size
length += (self.cipher_suites.len() as u32) * 2;
length += 1;
length += 1;
length += 2;
for extension in self.extensions.iter() {
length += (extension.get_length() as u32);
}
length
}
}
#[derive(Clone, Copy)]
pub(crate) struct ServerHello<'a, 'b> {
pub(crate) version: TlsVersion,
pub(crate) random: [u8; 32],
pub(crate) session_id_echo_length: u8,
pub(crate) session_id_echo: [u8; 32],
pub(crate) cipher_suite: CipherSuite,
pub(crate) compression_method: u8, // Always 0
pub(crate) extension_length: u16,
pub(crate) extensions: &'a[Extension<'b>],
}
#[derive(Debug, PartialEq, Eq, Clone, Copy, IntoPrimitive, TryFromPrimitive)]
#[repr(u16)]
pub(crate) enum ExtensionType {
ServerName = 0,
MaxFragmentLength = 1,
StatusRequest = 5,
SupportedGroups = 10,
SignatureAlgorithms = 13,
UseSRTP = 14,
Heartbeat = 15,
ApplicationLayerProtocolNegotiation = 16,
SignedCertificateTimestamp = 18,
ClientCertificateType = 19,
ServerCertificateType = 20,
Padding = 21,
PreSharedKey = 41,
EarlyData = 42,
SupportedVersions = 43,
Cookie = 44,
PSKKeyExchangeModes = 45,
CertificateAuthorities = 47,
OIDFilters = 48,
PostHandshakeAuth = 49,
SignatureAlgorithmsCert = 50,
KeyShare = 51,
}
impl ExtensionType {
pub(crate) fn get_length(&self) -> u16 {
return 2;
}
}
#[derive(Clone, Copy)]
pub(crate) struct Extension<'a> {
pub(crate) extension_type: ExtensionType,
pub(crate) length: u16,
pub(crate) extension_data: &'a[u8],
}
impl<'a> Extension<'a> {
pub(crate) fn get_length(&self) -> u16 {
self.extension_type.get_length() + 2 + (self.extension_data.len() as u16)
}
}