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Add length checks during parsing #441

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Aug 3, 2023
Merged

Add length checks during parsing #441

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58 changes: 48 additions & 10 deletions lorawan/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,12 @@ bitfield! {

impl MHDR {
pub fn read(reader: &mut dyn Buf) -> Result<Self, LoraWanError> {
if reader.remaining() < size_of::<Self>() {
return Err(LoraWanError::InvalidPacketSize(
MType::Invalid(0),
reader.remaining(),
));
}
Ok(Self(reader.get_u8()))
}

Expand Down Expand Up @@ -237,9 +243,13 @@ impl fmt::Debug for Fhdr {
}

impl Fhdr {
pub fn read(direction: Direction, reader: &mut dyn Buf) -> Result<Self, LoraWanError> {
pub fn read(
direction: Direction,
payload_type: MType,
reader: &mut dyn Buf,
) -> Result<Self, LoraWanError> {
let dev_addr = reader.get_u32_le();
let fctrl = FCtrl::read(direction, reader)?;
let fctrl = FCtrl::read(direction, payload_type, reader)?;
let fcnt = reader.get_u16_le();
let fopts = reader.copy_to_bytes(fctrl.fopts_len());
let res = Self {
Expand Down Expand Up @@ -277,7 +287,13 @@ bitfield! {
}

impl FCtrlUplink {
pub fn read(reader: &mut dyn Buf) -> Result<Self, LoraWanError> {
pub fn read(payload_type: MType, reader: &mut dyn Buf) -> Result<Self, LoraWanError> {
if reader.remaining() < size_of::<Self>() {
return Err(LoraWanError::InvalidPacketSize(
payload_type,
reader.remaining(),
));
}
Ok(Self(reader.get_u8()))
}

Expand All @@ -299,7 +315,13 @@ bitfield! {
}

impl FCtrlDownlink {
pub fn read(reader: &mut dyn Buf) -> Result<Self, LoraWanError> {
pub fn read(payload_type: MType, reader: &mut dyn Buf) -> Result<Self, LoraWanError> {
if reader.remaining() < size_of::<Self>() {
return Err(LoraWanError::InvalidPacketSize(
payload_type,
reader.remaining(),
));
}
Ok(Self(reader.get_u8()))
}

Expand All @@ -323,10 +345,14 @@ impl FCtrl {
}
}

pub fn read(direction: Direction, reader: &mut dyn Buf) -> Result<Self, LoraWanError> {
pub fn read(
direction: Direction,
payload_type: MType,
reader: &mut dyn Buf,
) -> Result<Self, LoraWanError> {
let res = match direction {
Direction::Uplink => Self::Uplink(FCtrlUplink::read(reader)?),
Direction::Downlink => Self::Downlink(FCtrlDownlink::read(reader)?),
Direction::Uplink => Self::Uplink(FCtrlUplink::read(payload_type, reader)?),
Direction::Downlink => Self::Downlink(FCtrlDownlink::read(payload_type, reader)?),
};
Ok(res)
}
Expand All @@ -352,7 +378,7 @@ impl MACPayload {
direction: Direction,
reader: &mut dyn Buf,
) -> Result<Self, LoraWanError> {
let fhdr = Fhdr::read(direction, reader)?;
let fhdr = Fhdr::read(direction, payload_type, reader)?;
let data = reader.copy_to_bytes(reader.remaining());
let (fport, payload) = match data.split_first() {
Some((port, mut payload)) => (
Expand Down Expand Up @@ -459,7 +485,13 @@ impl fmt::Debug for JoinRequest {

impl JoinRequest {
pub fn read(reader: &mut dyn Buf) -> Result<Self, LoraWanError> {
// TODO: Reader length check
if reader.remaining() < size_of::<Self>() {
return Err(LoraWanError::InvalidPacketSize(
MType::JoinRequest,
reader.remaining(),
));
}

let mut res = Self {
app_eui: reader.get_u64_le(),
dev_eui: reader.get_u64_le(),
Expand Down Expand Up @@ -489,7 +521,13 @@ pub struct JoinAccept {

impl JoinAccept {
pub fn read(reader: &mut dyn Buf) -> Result<Self, LoraWanError> {
// TODO: Reader length check
if reader.remaining() < size_of::<Self>() {
return Err(LoraWanError::InvalidPacketSize(
MType::JoinAccept,
reader.remaining(),
));
}

let mut app_nonce = [0u8; 3];
let mut net_id = [0u8; 3];
reader.copy_to_slice(&mut app_nonce);
Expand Down